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ad7f8a1f DA |
1 | /* |
2 | * Copyright © 2014 Red Hat | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/sched.h> | |
75bc08ab | 28 | #include <linux/seq_file.h> |
ad7f8a1f DA |
29 | #include <linux/i2c.h> |
30 | #include <drm/drm_dp_mst_helper.h> | |
31 | #include <drm/drmP.h> | |
32 | ||
33 | #include <drm/drm_fixed.h> | |
a4370c77 VS |
34 | #include <drm/drm_atomic.h> |
35 | #include <drm/drm_atomic_helper.h> | |
16bff572 | 36 | #include <drm/drm_crtc_helper.h> |
ad7f8a1f DA |
37 | |
38 | /** | |
39 | * DOC: dp mst helper | |
40 | * | |
41 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport | |
42 | * protocol. The helpers contain a topology manager and bandwidth manager. | |
43 | * The helpers encapsulate the sending and received of sideband msgs. | |
44 | */ | |
45 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
46 | char *buf); | |
47 | static int test_calc_pbn_mode(void); | |
48 | ||
d0757afd | 49 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); |
ad7f8a1f DA |
50 | |
51 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
52 | int id, | |
53 | struct drm_dp_payload *payload); | |
54 | ||
55 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
56 | struct drm_dp_mst_port *port, | |
57 | int offset, int size, u8 *bytes); | |
58 | ||
68d8c9fc DA |
59 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
60 | struct drm_dp_mst_branch *mstb); | |
ad7f8a1f DA |
61 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
62 | struct drm_dp_mst_branch *mstb, | |
63 | struct drm_dp_mst_port *port); | |
64 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
65 | u8 *guid); | |
66 | ||
67 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); | |
68 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); | |
69 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); | |
70 | /* sideband msg handling */ | |
71 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) | |
72 | { | |
73 | u8 bitmask = 0x80; | |
74 | u8 bitshift = 7; | |
75 | u8 array_index = 0; | |
76 | int number_of_bits = num_nibbles * 4; | |
77 | u8 remainder = 0; | |
78 | ||
79 | while (number_of_bits != 0) { | |
80 | number_of_bits--; | |
81 | remainder <<= 1; | |
82 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
83 | bitmask >>= 1; | |
84 | bitshift--; | |
85 | if (bitmask == 0) { | |
86 | bitmask = 0x80; | |
87 | bitshift = 7; | |
88 | array_index++; | |
89 | } | |
90 | if ((remainder & 0x10) == 0x10) | |
91 | remainder ^= 0x13; | |
92 | } | |
93 | ||
94 | number_of_bits = 4; | |
95 | while (number_of_bits != 0) { | |
96 | number_of_bits--; | |
97 | remainder <<= 1; | |
98 | if ((remainder & 0x10) != 0) | |
99 | remainder ^= 0x13; | |
100 | } | |
101 | ||
102 | return remainder; | |
103 | } | |
104 | ||
105 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) | |
106 | { | |
107 | u8 bitmask = 0x80; | |
108 | u8 bitshift = 7; | |
109 | u8 array_index = 0; | |
110 | int number_of_bits = number_of_bytes * 8; | |
111 | u16 remainder = 0; | |
112 | ||
113 | while (number_of_bits != 0) { | |
114 | number_of_bits--; | |
115 | remainder <<= 1; | |
116 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
117 | bitmask >>= 1; | |
118 | bitshift--; | |
119 | if (bitmask == 0) { | |
120 | bitmask = 0x80; | |
121 | bitshift = 7; | |
122 | array_index++; | |
123 | } | |
124 | if ((remainder & 0x100) == 0x100) | |
125 | remainder ^= 0xd5; | |
126 | } | |
127 | ||
128 | number_of_bits = 8; | |
129 | while (number_of_bits != 0) { | |
130 | number_of_bits--; | |
131 | remainder <<= 1; | |
132 | if ((remainder & 0x100) != 0) | |
133 | remainder ^= 0xd5; | |
134 | } | |
135 | ||
136 | return remainder & 0xff; | |
137 | } | |
138 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) | |
139 | { | |
140 | u8 size = 3; | |
141 | size += (hdr->lct / 2); | |
142 | return size; | |
143 | } | |
144 | ||
145 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
146 | u8 *buf, int *len) | |
147 | { | |
148 | int idx = 0; | |
149 | int i; | |
150 | u8 crc4; | |
151 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); | |
152 | for (i = 0; i < (hdr->lct / 2); i++) | |
153 | buf[idx++] = hdr->rad[i]; | |
154 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | | |
155 | (hdr->msg_len & 0x3f); | |
156 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); | |
157 | ||
158 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); | |
159 | buf[idx - 1] |= (crc4 & 0xf); | |
160 | ||
161 | *len = idx; | |
162 | } | |
163 | ||
164 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
165 | u8 *buf, int buflen, u8 *hdrlen) | |
166 | { | |
167 | u8 crc4; | |
168 | u8 len; | |
169 | int i; | |
170 | u8 idx; | |
171 | if (buf[0] == 0) | |
172 | return false; | |
173 | len = 3; | |
174 | len += ((buf[0] & 0xf0) >> 4) / 2; | |
175 | if (len > buflen) | |
176 | return false; | |
177 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); | |
178 | ||
179 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { | |
180 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); | |
181 | return false; | |
182 | } | |
183 | ||
184 | hdr->lct = (buf[0] & 0xf0) >> 4; | |
185 | hdr->lcr = (buf[0] & 0xf); | |
186 | idx = 1; | |
187 | for (i = 0; i < (hdr->lct / 2); i++) | |
188 | hdr->rad[i] = buf[idx++]; | |
189 | hdr->broadcast = (buf[idx] >> 7) & 0x1; | |
190 | hdr->path_msg = (buf[idx] >> 6) & 0x1; | |
191 | hdr->msg_len = buf[idx] & 0x3f; | |
192 | idx++; | |
193 | hdr->somt = (buf[idx] >> 7) & 0x1; | |
194 | hdr->eomt = (buf[idx] >> 6) & 0x1; | |
195 | hdr->seqno = (buf[idx] >> 4) & 0x1; | |
196 | idx++; | |
197 | *hdrlen = idx; | |
198 | return true; | |
199 | } | |
200 | ||
201 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, | |
202 | struct drm_dp_sideband_msg_tx *raw) | |
203 | { | |
204 | int idx = 0; | |
205 | int i; | |
206 | u8 *buf = raw->msg; | |
207 | buf[idx++] = req->req_type & 0x7f; | |
208 | ||
209 | switch (req->req_type) { | |
210 | case DP_ENUM_PATH_RESOURCES: | |
211 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
212 | idx++; | |
213 | break; | |
214 | case DP_ALLOCATE_PAYLOAD: | |
215 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | | |
216 | (req->u.allocate_payload.number_sdp_streams & 0xf); | |
217 | idx++; | |
218 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); | |
219 | idx++; | |
220 | buf[idx] = (req->u.allocate_payload.pbn >> 8); | |
221 | idx++; | |
222 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); | |
223 | idx++; | |
224 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { | |
225 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | | |
226 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); | |
227 | idx++; | |
228 | } | |
229 | if (req->u.allocate_payload.number_sdp_streams & 1) { | |
230 | i = req->u.allocate_payload.number_sdp_streams - 1; | |
231 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; | |
232 | idx++; | |
233 | } | |
234 | break; | |
235 | case DP_QUERY_PAYLOAD: | |
236 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; | |
237 | idx++; | |
238 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); | |
239 | idx++; | |
240 | break; | |
241 | case DP_REMOTE_DPCD_READ: | |
242 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; | |
243 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; | |
244 | idx++; | |
245 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; | |
246 | idx++; | |
247 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); | |
248 | idx++; | |
249 | buf[idx] = (req->u.dpcd_read.num_bytes); | |
250 | idx++; | |
251 | break; | |
252 | ||
253 | case DP_REMOTE_DPCD_WRITE: | |
254 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; | |
255 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; | |
256 | idx++; | |
257 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; | |
258 | idx++; | |
259 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); | |
260 | idx++; | |
261 | buf[idx] = (req->u.dpcd_write.num_bytes); | |
262 | idx++; | |
263 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); | |
264 | idx += req->u.dpcd_write.num_bytes; | |
265 | break; | |
266 | case DP_REMOTE_I2C_READ: | |
267 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; | |
268 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); | |
269 | idx++; | |
270 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { | |
271 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; | |
272 | idx++; | |
273 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; | |
274 | idx++; | |
275 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); | |
276 | idx += req->u.i2c_read.transactions[i].num_bytes; | |
277 | ||
278 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; | |
279 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); | |
280 | idx++; | |
281 | } | |
282 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; | |
283 | idx++; | |
284 | buf[idx] = (req->u.i2c_read.num_bytes_read); | |
285 | idx++; | |
286 | break; | |
287 | ||
288 | case DP_REMOTE_I2C_WRITE: | |
289 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; | |
290 | idx++; | |
291 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; | |
292 | idx++; | |
293 | buf[idx] = (req->u.i2c_write.num_bytes); | |
294 | idx++; | |
295 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); | |
296 | idx += req->u.i2c_write.num_bytes; | |
297 | break; | |
0bb9c2b2 DP |
298 | |
299 | case DP_POWER_DOWN_PHY: | |
300 | case DP_POWER_UP_PHY: | |
301 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
302 | idx++; | |
303 | break; | |
ad7f8a1f DA |
304 | } |
305 | raw->cur_len = idx; | |
306 | } | |
307 | ||
308 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) | |
309 | { | |
310 | u8 crc4; | |
311 | crc4 = drm_dp_msg_data_crc4(msg, len); | |
312 | msg[len] = crc4; | |
313 | } | |
314 | ||
315 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, | |
316 | struct drm_dp_sideband_msg_tx *raw) | |
317 | { | |
318 | int idx = 0; | |
319 | u8 *buf = raw->msg; | |
320 | ||
321 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); | |
322 | ||
323 | raw->cur_len = idx; | |
324 | } | |
325 | ||
326 | /* this adds a chunk of msg to the builder to get the final msg */ | |
327 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, | |
328 | u8 *replybuf, u8 replybuflen, bool hdr) | |
329 | { | |
330 | int ret; | |
331 | u8 crc4; | |
332 | ||
333 | if (hdr) { | |
334 | u8 hdrlen; | |
335 | struct drm_dp_sideband_msg_hdr recv_hdr; | |
336 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); | |
337 | if (ret == false) { | |
338 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); | |
339 | return false; | |
340 | } | |
341 | ||
636c4c3e ID |
342 | /* |
343 | * ignore out-of-order messages or messages that are part of a | |
344 | * failed transaction | |
345 | */ | |
346 | if (!recv_hdr.somt && !msg->have_somt) | |
347 | return false; | |
348 | ||
ad7f8a1f DA |
349 | /* get length contained in this portion */ |
350 | msg->curchunk_len = recv_hdr.msg_len; | |
351 | msg->curchunk_hdrlen = hdrlen; | |
352 | ||
353 | /* we have already gotten an somt - don't bother parsing */ | |
354 | if (recv_hdr.somt && msg->have_somt) | |
355 | return false; | |
356 | ||
357 | if (recv_hdr.somt) { | |
358 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); | |
359 | msg->have_somt = true; | |
360 | } | |
361 | if (recv_hdr.eomt) | |
362 | msg->have_eomt = true; | |
363 | ||
364 | /* copy the bytes for the remainder of this header chunk */ | |
365 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); | |
366 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); | |
367 | } else { | |
368 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); | |
369 | msg->curchunk_idx += replybuflen; | |
370 | } | |
371 | ||
372 | if (msg->curchunk_idx >= msg->curchunk_len) { | |
373 | /* do CRC */ | |
374 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); | |
375 | /* copy chunk into bigger msg */ | |
376 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); | |
377 | msg->curlen += msg->curchunk_len - 1; | |
378 | } | |
379 | return true; | |
380 | } | |
381 | ||
382 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, | |
383 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
384 | { | |
385 | int idx = 1; | |
386 | int i; | |
387 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); | |
388 | idx += 16; | |
389 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; | |
390 | idx++; | |
391 | if (idx > raw->curlen) | |
392 | goto fail_len; | |
393 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { | |
394 | if (raw->msg[idx] & 0x80) | |
395 | repmsg->u.link_addr.ports[i].input_port = 1; | |
396 | ||
397 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; | |
398 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); | |
399 | ||
400 | idx++; | |
401 | if (idx > raw->curlen) | |
402 | goto fail_len; | |
403 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; | |
404 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; | |
405 | if (repmsg->u.link_addr.ports[i].input_port == 0) | |
406 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
407 | idx++; | |
408 | if (idx > raw->curlen) | |
409 | goto fail_len; | |
410 | if (repmsg->u.link_addr.ports[i].input_port == 0) { | |
411 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); | |
412 | idx++; | |
413 | if (idx > raw->curlen) | |
414 | goto fail_len; | |
415 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); | |
416 | idx += 16; | |
417 | if (idx > raw->curlen) | |
418 | goto fail_len; | |
419 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; | |
420 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); | |
421 | idx++; | |
422 | ||
423 | } | |
424 | if (idx > raw->curlen) | |
425 | goto fail_len; | |
426 | } | |
427 | ||
428 | return true; | |
429 | fail_len: | |
430 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
431 | return false; | |
432 | } | |
433 | ||
434 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, | |
435 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
436 | { | |
437 | int idx = 1; | |
438 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; | |
439 | idx++; | |
440 | if (idx > raw->curlen) | |
441 | goto fail_len; | |
442 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; | |
a4c30a48 | 443 | idx++; |
ad7f8a1f DA |
444 | if (idx > raw->curlen) |
445 | goto fail_len; | |
446 | ||
447 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); | |
448 | return true; | |
449 | fail_len: | |
450 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
451 | return false; | |
452 | } | |
453 | ||
454 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, | |
455 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
456 | { | |
457 | int idx = 1; | |
458 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; | |
459 | idx++; | |
460 | if (idx > raw->curlen) | |
461 | goto fail_len; | |
462 | return true; | |
463 | fail_len: | |
464 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); | |
465 | return false; | |
466 | } | |
467 | ||
468 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, | |
469 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
470 | { | |
471 | int idx = 1; | |
472 | ||
473 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); | |
474 | idx++; | |
475 | if (idx > raw->curlen) | |
476 | goto fail_len; | |
477 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; | |
478 | idx++; | |
479 | /* TODO check */ | |
480 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); | |
481 | return true; | |
482 | fail_len: | |
483 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); | |
484 | return false; | |
485 | } | |
486 | ||
487 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, | |
488 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
489 | { | |
490 | int idx = 1; | |
491 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; | |
492 | idx++; | |
493 | if (idx > raw->curlen) | |
494 | goto fail_len; | |
495 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
496 | idx += 2; | |
497 | if (idx > raw->curlen) | |
498 | goto fail_len; | |
499 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
500 | idx += 2; | |
501 | if (idx > raw->curlen) | |
502 | goto fail_len; | |
503 | return true; | |
504 | fail_len: | |
505 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); | |
506 | return false; | |
507 | } | |
508 | ||
509 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
510 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
511 | { | |
512 | int idx = 1; | |
513 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
514 | idx++; | |
515 | if (idx > raw->curlen) | |
516 | goto fail_len; | |
517 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; | |
518 | idx++; | |
519 | if (idx > raw->curlen) | |
520 | goto fail_len; | |
521 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
522 | idx += 2; | |
523 | if (idx > raw->curlen) | |
524 | goto fail_len; | |
525 | return true; | |
526 | fail_len: | |
527 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); | |
528 | return false; | |
529 | } | |
530 | ||
531 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
532 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
533 | { | |
534 | int idx = 1; | |
535 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
536 | idx++; | |
537 | if (idx > raw->curlen) | |
538 | goto fail_len; | |
539 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
540 | idx += 2; | |
541 | if (idx > raw->curlen) | |
542 | goto fail_len; | |
543 | return true; | |
544 | fail_len: | |
545 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); | |
546 | return false; | |
547 | } | |
548 | ||
0bb9c2b2 DP |
549 | static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
550 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
551 | { | |
552 | int idx = 1; | |
553 | ||
554 | repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; | |
555 | idx++; | |
556 | if (idx > raw->curlen) { | |
557 | DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", | |
558 | idx, raw->curlen); | |
559 | return false; | |
560 | } | |
561 | return true; | |
562 | } | |
563 | ||
ad7f8a1f DA |
564 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
565 | struct drm_dp_sideband_msg_reply_body *msg) | |
566 | { | |
567 | memset(msg, 0, sizeof(*msg)); | |
568 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; | |
569 | msg->req_type = (raw->msg[0] & 0x7f); | |
570 | ||
571 | if (msg->reply_type) { | |
572 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); | |
573 | msg->u.nak.reason = raw->msg[17]; | |
574 | msg->u.nak.nak_data = raw->msg[18]; | |
575 | return false; | |
576 | } | |
577 | ||
578 | switch (msg->req_type) { | |
579 | case DP_LINK_ADDRESS: | |
580 | return drm_dp_sideband_parse_link_address(raw, msg); | |
581 | case DP_QUERY_PAYLOAD: | |
582 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); | |
583 | case DP_REMOTE_DPCD_READ: | |
584 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); | |
585 | case DP_REMOTE_DPCD_WRITE: | |
586 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); | |
587 | case DP_REMOTE_I2C_READ: | |
588 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); | |
589 | case DP_ENUM_PATH_RESOURCES: | |
590 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); | |
591 | case DP_ALLOCATE_PAYLOAD: | |
592 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); | |
0bb9c2b2 DP |
593 | case DP_POWER_DOWN_PHY: |
594 | case DP_POWER_UP_PHY: | |
595 | return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); | |
ad7f8a1f DA |
596 | default: |
597 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); | |
598 | return false; | |
599 | } | |
600 | } | |
601 | ||
602 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
603 | struct drm_dp_sideband_msg_req_body *msg) | |
604 | { | |
605 | int idx = 1; | |
606 | ||
607 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
608 | idx++; | |
609 | if (idx > raw->curlen) | |
610 | goto fail_len; | |
611 | ||
612 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); | |
613 | idx += 16; | |
614 | if (idx > raw->curlen) | |
615 | goto fail_len; | |
616 | ||
617 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; | |
618 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
619 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; | |
620 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; | |
621 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); | |
622 | idx++; | |
623 | return true; | |
624 | fail_len: | |
625 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); | |
626 | return false; | |
627 | } | |
628 | ||
629 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
630 | struct drm_dp_sideband_msg_req_body *msg) | |
631 | { | |
632 | int idx = 1; | |
633 | ||
634 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
635 | idx++; | |
636 | if (idx > raw->curlen) | |
637 | goto fail_len; | |
638 | ||
639 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); | |
640 | idx += 16; | |
641 | if (idx > raw->curlen) | |
642 | goto fail_len; | |
643 | ||
644 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
645 | idx++; | |
646 | return true; | |
647 | fail_len: | |
648 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); | |
649 | return false; | |
650 | } | |
651 | ||
652 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, | |
653 | struct drm_dp_sideband_msg_req_body *msg) | |
654 | { | |
655 | memset(msg, 0, sizeof(*msg)); | |
656 | msg->req_type = (raw->msg[0] & 0x7f); | |
657 | ||
658 | switch (msg->req_type) { | |
659 | case DP_CONNECTION_STATUS_NOTIFY: | |
660 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); | |
661 | case DP_RESOURCE_STATUS_NOTIFY: | |
662 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); | |
663 | default: | |
664 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); | |
665 | return false; | |
666 | } | |
667 | } | |
668 | ||
669 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) | |
670 | { | |
671 | struct drm_dp_sideband_msg_req_body req; | |
672 | ||
673 | req.req_type = DP_REMOTE_DPCD_WRITE; | |
674 | req.u.dpcd_write.port_number = port_num; | |
675 | req.u.dpcd_write.dpcd_address = offset; | |
676 | req.u.dpcd_write.num_bytes = num_bytes; | |
677 | req.u.dpcd_write.bytes = bytes; | |
678 | drm_dp_encode_sideband_req(&req, msg); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) | |
684 | { | |
685 | struct drm_dp_sideband_msg_req_body req; | |
686 | ||
687 | req.req_type = DP_LINK_ADDRESS; | |
688 | drm_dp_encode_sideband_req(&req, msg); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) | |
693 | { | |
694 | struct drm_dp_sideband_msg_req_body req; | |
695 | ||
696 | req.req_type = DP_ENUM_PATH_RESOURCES; | |
697 | req.u.port_num.port_number = port_num; | |
698 | drm_dp_encode_sideband_req(&req, msg); | |
699 | msg->path_msg = true; | |
700 | return 0; | |
701 | } | |
702 | ||
703 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, | |
ef8f9bea LY |
704 | u8 vcpi, uint16_t pbn, |
705 | u8 number_sdp_streams, | |
706 | u8 *sdp_stream_sink) | |
ad7f8a1f DA |
707 | { |
708 | struct drm_dp_sideband_msg_req_body req; | |
709 | memset(&req, 0, sizeof(req)); | |
710 | req.req_type = DP_ALLOCATE_PAYLOAD; | |
711 | req.u.allocate_payload.port_number = port_num; | |
712 | req.u.allocate_payload.vcpi = vcpi; | |
713 | req.u.allocate_payload.pbn = pbn; | |
ef8f9bea LY |
714 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
715 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, | |
716 | number_sdp_streams); | |
ad7f8a1f DA |
717 | drm_dp_encode_sideband_req(&req, msg); |
718 | msg->path_msg = true; | |
719 | return 0; | |
720 | } | |
721 | ||
0bb9c2b2 DP |
722 | static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
723 | int port_num, bool power_up) | |
724 | { | |
725 | struct drm_dp_sideband_msg_req_body req; | |
726 | ||
727 | if (power_up) | |
728 | req.req_type = DP_POWER_UP_PHY; | |
729 | else | |
730 | req.req_type = DP_POWER_DOWN_PHY; | |
731 | ||
732 | req.u.port_num.port_number = port_num; | |
733 | drm_dp_encode_sideband_req(&req, msg); | |
734 | msg->path_msg = true; | |
735 | return 0; | |
736 | } | |
737 | ||
ad7f8a1f DA |
738 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
739 | struct drm_dp_vcpi *vcpi) | |
740 | { | |
dfda0df3 | 741 | int ret, vcpi_ret; |
ad7f8a1f DA |
742 | |
743 | mutex_lock(&mgr->payload_lock); | |
744 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); | |
745 | if (ret > mgr->max_payloads) { | |
746 | ret = -EINVAL; | |
747 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); | |
748 | goto out_unlock; | |
749 | } | |
750 | ||
dfda0df3 DA |
751 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
752 | if (vcpi_ret > mgr->max_payloads) { | |
753 | ret = -EINVAL; | |
754 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); | |
755 | goto out_unlock; | |
756 | } | |
757 | ||
ad7f8a1f | 758 | set_bit(ret, &mgr->payload_mask); |
dfda0df3 DA |
759 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
760 | vcpi->vcpi = vcpi_ret + 1; | |
ad7f8a1f DA |
761 | mgr->proposed_vcpis[ret - 1] = vcpi; |
762 | out_unlock: | |
763 | mutex_unlock(&mgr->payload_lock); | |
764 | return ret; | |
765 | } | |
766 | ||
767 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
dfda0df3 | 768 | int vcpi) |
ad7f8a1f | 769 | { |
dfda0df3 DA |
770 | int i; |
771 | if (vcpi == 0) | |
ad7f8a1f DA |
772 | return; |
773 | ||
774 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 DA |
775 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
776 | clear_bit(vcpi - 1, &mgr->vcpi_mask); | |
777 | ||
778 | for (i = 0; i < mgr->max_payloads; i++) { | |
779 | if (mgr->proposed_vcpis[i]) | |
780 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { | |
781 | mgr->proposed_vcpis[i] = NULL; | |
782 | clear_bit(i + 1, &mgr->payload_mask); | |
783 | } | |
784 | } | |
ad7f8a1f DA |
785 | mutex_unlock(&mgr->payload_lock); |
786 | } | |
787 | ||
788 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, | |
789 | struct drm_dp_sideband_msg_tx *txmsg) | |
790 | { | |
992d38cc | 791 | unsigned int state; |
cd961bb9 DV |
792 | |
793 | /* | |
794 | * All updates to txmsg->state are protected by mgr->qlock, and the two | |
795 | * cases we check here are terminal states. For those the barriers | |
796 | * provided by the wake_up/wait_event pair are enough. | |
797 | */ | |
992d38cc CW |
798 | state = READ_ONCE(txmsg->state); |
799 | return (state == DRM_DP_SIDEBAND_TX_RX || | |
800 | state == DRM_DP_SIDEBAND_TX_TIMEOUT); | |
ad7f8a1f DA |
801 | } |
802 | ||
803 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, | |
804 | struct drm_dp_sideband_msg_tx *txmsg) | |
805 | { | |
806 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
807 | int ret; | |
808 | ||
809 | ret = wait_event_timeout(mgr->tx_waitq, | |
810 | check_txmsg_state(mgr, txmsg), | |
811 | (4 * HZ)); | |
812 | mutex_lock(&mstb->mgr->qlock); | |
813 | if (ret > 0) { | |
814 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { | |
815 | ret = -EIO; | |
816 | goto out; | |
817 | } | |
818 | } else { | |
819 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); | |
820 | ||
821 | /* dump some state */ | |
822 | ret = -EIO; | |
823 | ||
824 | /* remove from q */ | |
825 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || | |
826 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { | |
827 | list_del(&txmsg->next); | |
828 | } | |
829 | ||
830 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || | |
831 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { | |
832 | mstb->tx_slots[txmsg->seqno] = NULL; | |
833 | } | |
834 | } | |
835 | out: | |
836 | mutex_unlock(&mgr->qlock); | |
837 | ||
838 | return ret; | |
839 | } | |
840 | ||
841 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) | |
842 | { | |
843 | struct drm_dp_mst_branch *mstb; | |
844 | ||
845 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); | |
846 | if (!mstb) | |
847 | return NULL; | |
848 | ||
849 | mstb->lct = lct; | |
850 | if (lct > 1) | |
851 | memcpy(mstb->rad, rad, lct / 2); | |
852 | INIT_LIST_HEAD(&mstb->ports); | |
ebcc0e6b LP |
853 | kref_init(&mstb->topology_kref); |
854 | kref_init(&mstb->malloc_kref); | |
ad7f8a1f DA |
855 | return mstb; |
856 | } | |
857 | ||
91a25e46 ML |
858 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
859 | { | |
ebcc0e6b LP |
860 | struct drm_dp_mst_branch *mstb = |
861 | container_of(kref, struct drm_dp_mst_branch, malloc_kref); | |
862 | ||
863 | if (mstb->port_parent) | |
864 | drm_dp_mst_put_port_malloc(mstb->port_parent); | |
865 | ||
91a25e46 ML |
866 | kfree(mstb); |
867 | } | |
868 | ||
ebcc0e6b LP |
869 | /** |
870 | * DOC: Branch device and port refcounting | |
871 | * | |
872 | * Topology refcount overview | |
873 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
874 | * | |
875 | * The refcounting schemes for &struct drm_dp_mst_branch and &struct | |
876 | * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have | |
877 | * two different kinds of refcounts: topology refcounts, and malloc refcounts. | |
878 | * | |
879 | * Topology refcounts are not exposed to drivers, and are handled internally | |
880 | * by the DP MST helpers. The helpers use them in order to prevent the | |
881 | * in-memory topology state from being changed in the middle of critical | |
882 | * operations like changing the internal state of payload allocations. This | |
883 | * means each branch and port will be considered to be connected to the rest | |
884 | * of the topology until it's topology refcount reaches zero. Additionally, | |
885 | * for ports this means that their associated &struct drm_connector will stay | |
886 | * registered with userspace until the port's refcount reaches 0. | |
887 | * | |
888 | * Malloc refcount overview | |
889 | * ~~~~~~~~~~~~~~~~~~~~~~~~ | |
890 | * | |
891 | * Malloc references are used to keep a &struct drm_dp_mst_port or &struct | |
892 | * drm_dp_mst_branch allocated even after all of its topology references have | |
893 | * been dropped, so that the driver or MST helpers can safely access each | |
894 | * branch's last known state before it was disconnected from the topology. | |
895 | * When the malloc refcount of a port or branch reaches 0, the memory | |
896 | * allocation containing the &struct drm_dp_mst_branch or &struct | |
897 | * drm_dp_mst_port respectively will be freed. | |
898 | * | |
899 | * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed | |
900 | * to drivers. As of writing this documentation, there are no drivers that | |
901 | * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST | |
902 | * helpers. Exposing this API to drivers in a race-free manner would take more | |
903 | * tweaking of the refcounting scheme, however patches are welcome provided | |
904 | * there is a legitimate driver usecase for this. | |
905 | * | |
906 | * Refcount relationships in a topology | |
907 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
908 | * | |
909 | * Let's take a look at why the relationship between topology and malloc | |
910 | * refcounts is designed the way it is. | |
911 | * | |
912 | * .. kernel-figure:: dp-mst/topology-figure-1.dot | |
913 | * | |
914 | * An example of topology and malloc refs in a DP MST topology with two | |
915 | * active payloads. Topology refcount increments are indicated by solid | |
916 | * lines, and malloc refcount increments are indicated by dashed lines. | |
917 | * Each starts from the branch which incremented the refcount, and ends at | |
918 | * the branch to which the refcount belongs to, i.e. the arrow points the | |
919 | * same way as the C pointers used to reference a structure. | |
920 | * | |
921 | * As you can see in the above figure, every branch increments the topology | |
922 | * refcount of it's children, and increments the malloc refcount of it's | |
923 | * parent. Additionally, every payload increments the malloc refcount of it's | |
924 | * assigned port by 1. | |
925 | * | |
926 | * So, what would happen if MSTB #3 from the above figure was unplugged from | |
927 | * the system, but the driver hadn't yet removed payload #2 from port #3? The | |
928 | * topology would start to look like the figure below. | |
929 | * | |
930 | * .. kernel-figure:: dp-mst/topology-figure-2.dot | |
931 | * | |
932 | * Ports and branch devices which have been released from memory are | |
933 | * colored grey, and references which have been removed are colored red. | |
934 | * | |
935 | * Whenever a port or branch device's topology refcount reaches zero, it will | |
936 | * decrement the topology refcounts of all its children, the malloc refcount | |
937 | * of its parent, and finally its own malloc refcount. For MSTB #4 and port | |
938 | * #4, this means they both have been disconnected from the topology and freed | |
939 | * from memory. But, because payload #2 is still holding a reference to port | |
940 | * #3, port #3 is removed from the topology but it's &struct drm_dp_mst_port | |
941 | * is still accessible from memory. This also means port #3 has not yet | |
942 | * decremented the malloc refcount of MSTB #3, so it's &struct | |
943 | * drm_dp_mst_branch will also stay allocated in memory until port #3's | |
944 | * malloc refcount reaches 0. | |
945 | * | |
946 | * This relationship is necessary because in order to release payload #2, we | |
947 | * need to be able to figure out the last relative of port #3 that's still | |
948 | * connected to the topology. In this case, we would travel up the topology as | |
949 | * shown below. | |
950 | * | |
951 | * .. kernel-figure:: dp-mst/topology-figure-3.dot | |
952 | * | |
953 | * And finally, remove payload #2 by communicating with port #2 through | |
954 | * sideband transactions. | |
955 | */ | |
956 | ||
957 | /** | |
958 | * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch | |
959 | * device | |
960 | * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of | |
961 | * | |
962 | * Increments &drm_dp_mst_branch.malloc_kref. When | |
963 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb | |
964 | * will be released and @mstb may no longer be used. | |
965 | * | |
966 | * See also: drm_dp_mst_put_mstb_malloc() | |
967 | */ | |
968 | static void | |
969 | drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb) | |
970 | { | |
971 | kref_get(&mstb->malloc_kref); | |
972 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref)); | |
973 | } | |
974 | ||
975 | /** | |
976 | * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch | |
977 | * device | |
978 | * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of | |
979 | * | |
980 | * Decrements &drm_dp_mst_branch.malloc_kref. When | |
981 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb | |
982 | * will be released and @mstb may no longer be used. | |
983 | * | |
984 | * See also: drm_dp_mst_get_mstb_malloc() | |
985 | */ | |
986 | static void | |
987 | drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb) | |
988 | { | |
989 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1); | |
990 | kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device); | |
991 | } | |
992 | ||
993 | static void drm_dp_free_mst_port(struct kref *kref) | |
994 | { | |
995 | struct drm_dp_mst_port *port = | |
996 | container_of(kref, struct drm_dp_mst_port, malloc_kref); | |
997 | ||
998 | drm_dp_mst_put_mstb_malloc(port->parent); | |
999 | kfree(port); | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port | |
1004 | * @port: The &struct drm_dp_mst_port to increment the malloc refcount of | |
1005 | * | |
1006 | * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref | |
1007 | * reaches 0, the memory allocation for @port will be released and @port may | |
1008 | * no longer be used. | |
1009 | * | |
1010 | * Because @port could potentially be freed at any time by the DP MST helpers | |
1011 | * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this | |
1012 | * function, drivers that which to make use of &struct drm_dp_mst_port should | |
1013 | * ensure that they grab at least one main malloc reference to their MST ports | |
1014 | * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before | |
1015 | * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0. | |
1016 | * | |
1017 | * See also: drm_dp_mst_put_port_malloc() | |
1018 | */ | |
1019 | void | |
1020 | drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port) | |
1021 | { | |
1022 | kref_get(&port->malloc_kref); | |
1023 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref)); | |
1024 | } | |
1025 | EXPORT_SYMBOL(drm_dp_mst_get_port_malloc); | |
1026 | ||
1027 | /** | |
1028 | * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port | |
1029 | * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of | |
1030 | * | |
1031 | * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref | |
1032 | * reaches 0, the memory allocation for @port will be released and @port may | |
1033 | * no longer be used. | |
1034 | * | |
1035 | * See also: drm_dp_mst_get_port_malloc() | |
1036 | */ | |
1037 | void | |
1038 | drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port) | |
1039 | { | |
1040 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1); | |
1041 | kref_put(&port->malloc_kref, drm_dp_free_mst_port); | |
1042 | } | |
1043 | EXPORT_SYMBOL(drm_dp_mst_put_port_malloc); | |
1044 | ||
ad7f8a1f DA |
1045 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
1046 | { | |
ebcc0e6b LP |
1047 | struct drm_dp_mst_branch *mstb = |
1048 | container_of(kref, struct drm_dp_mst_branch, topology_kref); | |
1049 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
ad7f8a1f DA |
1050 | struct drm_dp_mst_port *port, *tmp; |
1051 | bool wake_tx = false; | |
1052 | ||
ebcc0e6b | 1053 | mutex_lock(&mgr->lock); |
ad7f8a1f DA |
1054 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
1055 | list_del(&port->next); | |
d0757afd | 1056 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f | 1057 | } |
ebcc0e6b | 1058 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
1059 | |
1060 | /* drop any tx slots msg */ | |
1061 | mutex_lock(&mstb->mgr->qlock); | |
1062 | if (mstb->tx_slots[0]) { | |
1063 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
1064 | mstb->tx_slots[0] = NULL; | |
1065 | wake_tx = true; | |
1066 | } | |
1067 | if (mstb->tx_slots[1]) { | |
1068 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
1069 | mstb->tx_slots[1] = NULL; | |
1070 | wake_tx = true; | |
1071 | } | |
1072 | mutex_unlock(&mstb->mgr->qlock); | |
1073 | ||
1074 | if (wake_tx) | |
68e989dc | 1075 | wake_up_all(&mstb->mgr->tx_waitq); |
91a25e46 | 1076 | |
ebcc0e6b | 1077 | drm_dp_mst_put_mstb_malloc(mstb); |
ad7f8a1f DA |
1078 | } |
1079 | ||
ebcc0e6b LP |
1080 | /** |
1081 | * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a | |
1082 | * branch device unless its zero | |
1083 | * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of | |
1084 | * | |
1085 | * Attempts to grab a topology reference to @mstb, if it hasn't yet been | |
1086 | * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has | |
1087 | * reached 0). Holding a topology reference implies that a malloc reference | |
1088 | * will be held to @mstb as long as the user holds the topology reference. | |
1089 | * | |
1090 | * Care should be taken to ensure that the user has at least one malloc | |
1091 | * reference to @mstb. If you already have a topology reference to @mstb, you | |
1092 | * should use drm_dp_mst_topology_get_mstb() instead. | |
1093 | * | |
1094 | * See also: | |
1095 | * drm_dp_mst_topology_get_mstb() | |
1096 | * drm_dp_mst_topology_put_mstb() | |
1097 | * | |
1098 | * Returns: | |
1099 | * * 1: A topology reference was grabbed successfully | |
1100 | * * 0: @port is no longer in the topology, no reference was grabbed | |
1101 | */ | |
1102 | static int __must_check | |
1103 | drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb) | |
ad7f8a1f | 1104 | { |
ebcc0e6b LP |
1105 | int ret = kref_get_unless_zero(&mstb->topology_kref); |
1106 | ||
1107 | if (ret) | |
1108 | DRM_DEBUG("mstb %p (%d)\n", mstb, | |
1109 | kref_read(&mstb->topology_kref)); | |
1110 | ||
1111 | return ret; | |
ad7f8a1f DA |
1112 | } |
1113 | ||
ebcc0e6b LP |
1114 | /** |
1115 | * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a | |
1116 | * branch device | |
1117 | * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of | |
1118 | * | |
1119 | * Increments &drm_dp_mst_branch.topology_refcount without checking whether or | |
1120 | * not it's already reached 0. This is only valid to use in scenarios where | |
1121 | * you are already guaranteed to have at least one active topology reference | |
1122 | * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used. | |
1123 | * | |
1124 | * See also: | |
1125 | * drm_dp_mst_topology_try_get_mstb() | |
1126 | * drm_dp_mst_topology_put_mstb() | |
1127 | */ | |
1128 | static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb) | |
1129 | { | |
1130 | WARN_ON(kref_read(&mstb->topology_kref) == 0); | |
1131 | kref_get(&mstb->topology_kref); | |
1132 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref)); | |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch | |
1137 | * device | |
1138 | * @mstb: The &struct drm_dp_mst_branch to release the topology reference from | |
1139 | * | |
1140 | * Releases a topology reference from @mstb by decrementing | |
1141 | * &drm_dp_mst_branch.topology_kref. | |
1142 | * | |
1143 | * See also: | |
1144 | * drm_dp_mst_topology_try_get_mstb() | |
1145 | * drm_dp_mst_topology_get_mstb() | |
1146 | */ | |
1147 | static void | |
1148 | drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb) | |
1149 | { | |
1150 | DRM_DEBUG("mstb %p (%d)\n", | |
1151 | mstb, kref_read(&mstb->topology_kref) - 1); | |
1152 | kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device); | |
1153 | } | |
ad7f8a1f DA |
1154 | |
1155 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) | |
1156 | { | |
0391359d DV |
1157 | struct drm_dp_mst_branch *mstb; |
1158 | ||
ad7f8a1f DA |
1159 | switch (old_pdt) { |
1160 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
1161 | case DP_PEER_DEVICE_SST_SINK: | |
1162 | /* remove i2c over sideband */ | |
1163 | drm_dp_mst_unregister_i2c_bus(&port->aux); | |
1164 | break; | |
1165 | case DP_PEER_DEVICE_MST_BRANCHING: | |
0391359d | 1166 | mstb = port->mstb; |
ad7f8a1f | 1167 | port->mstb = NULL; |
d0757afd | 1168 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
1169 | break; |
1170 | } | |
1171 | } | |
1172 | ||
1173 | static void drm_dp_destroy_port(struct kref *kref) | |
1174 | { | |
ebcc0e6b LP |
1175 | struct drm_dp_mst_port *port = |
1176 | container_of(kref, struct drm_dp_mst_port, topology_kref); | |
ad7f8a1f | 1177 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
df4839fd | 1178 | |
ad7f8a1f | 1179 | if (!port->input) { |
c6a0aed4 | 1180 | kfree(port->cached_edid); |
6b8eeca6 | 1181 | |
df4839fd DA |
1182 | /* |
1183 | * The only time we don't have a connector | |
1184 | * on an output port is if the connector init | |
1185 | * fails. | |
1186 | */ | |
6b8eeca6 | 1187 | if (port->connector) { |
df4839fd DA |
1188 | /* we can't destroy the connector here, as |
1189 | * we might be holding the mode_config.mutex | |
1190 | * from an EDID retrieval */ | |
1191 | ||
6b8eeca6 | 1192 | mutex_lock(&mgr->destroy_connector_lock); |
4772ff03 | 1193 | list_add(&port->next, &mgr->destroy_connector_list); |
6b8eeca6 DA |
1194 | mutex_unlock(&mgr->destroy_connector_lock); |
1195 | schedule_work(&mgr->destroy_connector_work); | |
4772ff03 | 1196 | return; |
6b8eeca6 | 1197 | } |
df4839fd DA |
1198 | /* no need to clean up vcpi |
1199 | * as if we have no connector we never setup a vcpi */ | |
ad7f8a1f | 1200 | drm_dp_port_teardown_pdt(port, port->pdt); |
36e3fa6a | 1201 | port->pdt = DP_PEER_DEVICE_NONE; |
ad7f8a1f | 1202 | } |
ebcc0e6b LP |
1203 | drm_dp_mst_put_port_malloc(port); |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a | |
1208 | * port unless its zero | |
1209 | * @port: &struct drm_dp_mst_port to increment the topology refcount of | |
1210 | * | |
1211 | * Attempts to grab a topology reference to @port, if it hasn't yet been | |
1212 | * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached | |
1213 | * 0). Holding a topology reference implies that a malloc reference will be | |
1214 | * held to @port as long as the user holds the topology reference. | |
1215 | * | |
1216 | * Care should be taken to ensure that the user has at least one malloc | |
1217 | * reference to @port. If you already have a topology reference to @port, you | |
1218 | * should use drm_dp_mst_topology_get_port() instead. | |
1219 | * | |
1220 | * See also: | |
1221 | * drm_dp_mst_topology_get_port() | |
1222 | * drm_dp_mst_topology_put_port() | |
1223 | * | |
1224 | * Returns: | |
1225 | * * 1: A topology reference was grabbed successfully | |
1226 | * * 0: @port is no longer in the topology, no reference was grabbed | |
1227 | */ | |
1228 | static int __must_check | |
1229 | drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port) | |
1230 | { | |
1231 | int ret = kref_get_unless_zero(&port->topology_kref); | |
1232 | ||
1233 | if (ret) | |
1234 | DRM_DEBUG("port %p (%d)\n", port, | |
1235 | kref_read(&port->topology_kref)); | |
1236 | ||
1237 | return ret; | |
ad7f8a1f DA |
1238 | } |
1239 | ||
ebcc0e6b LP |
1240 | /** |
1241 | * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port | |
1242 | * @port: The &struct drm_dp_mst_port to increment the topology refcount of | |
1243 | * | |
1244 | * Increments &drm_dp_mst_port.topology_refcount without checking whether or | |
1245 | * not it's already reached 0. This is only valid to use in scenarios where | |
1246 | * you are already guaranteed to have at least one active topology reference | |
1247 | * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used. | |
1248 | * | |
1249 | * See also: | |
1250 | * drm_dp_mst_topology_try_get_port() | |
1251 | * drm_dp_mst_topology_put_port() | |
1252 | */ | |
1253 | static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port) | |
1254 | { | |
1255 | WARN_ON(kref_read(&port->topology_kref) == 0); | |
1256 | kref_get(&port->topology_kref); | |
1257 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->topology_kref)); | |
1258 | } | |
1259 | ||
1260 | /** | |
1261 | * drm_dp_mst_topology_put_port() - release a topology reference to a port | |
1262 | * @port: The &struct drm_dp_mst_port to release the topology reference from | |
1263 | * | |
1264 | * Releases a topology reference from @port by decrementing | |
1265 | * &drm_dp_mst_port.topology_kref. | |
1266 | * | |
1267 | * See also: | |
1268 | * drm_dp_mst_topology_try_get_port() | |
1269 | * drm_dp_mst_topology_get_port() | |
1270 | */ | |
d0757afd | 1271 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port) |
ad7f8a1f | 1272 | { |
ebcc0e6b LP |
1273 | DRM_DEBUG("port %p (%d)\n", |
1274 | port, kref_read(&port->topology_kref) - 1); | |
1275 | kref_put(&port->topology_kref, drm_dp_destroy_port); | |
ad7f8a1f DA |
1276 | } |
1277 | ||
d0757afd LP |
1278 | static struct drm_dp_mst_branch * |
1279 | drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb, | |
1280 | struct drm_dp_mst_branch *to_find) | |
ad7f8a1f DA |
1281 | { |
1282 | struct drm_dp_mst_port *port; | |
1283 | struct drm_dp_mst_branch *rmstb; | |
ebcc0e6b LP |
1284 | |
1285 | if (to_find == mstb) | |
ad7f8a1f | 1286 | return mstb; |
ebcc0e6b | 1287 | |
ad7f8a1f DA |
1288 | list_for_each_entry(port, &mstb->ports, next) { |
1289 | if (port->mstb) { | |
d0757afd LP |
1290 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
1291 | port->mstb, to_find); | |
ad7f8a1f DA |
1292 | if (rmstb) |
1293 | return rmstb; | |
1294 | } | |
1295 | } | |
1296 | return NULL; | |
1297 | } | |
1298 | ||
d0757afd LP |
1299 | static struct drm_dp_mst_branch * |
1300 | drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr, | |
1301 | struct drm_dp_mst_branch *mstb) | |
ad7f8a1f DA |
1302 | { |
1303 | struct drm_dp_mst_branch *rmstb = NULL; | |
ebcc0e6b | 1304 | |
ad7f8a1f | 1305 | mutex_lock(&mgr->lock); |
ebcc0e6b | 1306 | if (mgr->mst_primary) { |
d0757afd LP |
1307 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
1308 | mgr->mst_primary, mstb); | |
ebcc0e6b LP |
1309 | |
1310 | if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb)) | |
1311 | rmstb = NULL; | |
1312 | } | |
ad7f8a1f DA |
1313 | mutex_unlock(&mgr->lock); |
1314 | return rmstb; | |
1315 | } | |
1316 | ||
ebcc0e6b LP |
1317 | static struct drm_dp_mst_port * |
1318 | drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, | |
1319 | struct drm_dp_mst_port *to_find) | |
ad7f8a1f DA |
1320 | { |
1321 | struct drm_dp_mst_port *port, *mport; | |
1322 | ||
1323 | list_for_each_entry(port, &mstb->ports, next) { | |
ebcc0e6b | 1324 | if (port == to_find) |
ad7f8a1f | 1325 | return port; |
ebcc0e6b | 1326 | |
ad7f8a1f | 1327 | if (port->mstb) { |
ebcc0e6b LP |
1328 | mport = drm_dp_mst_topology_get_port_validated_locked( |
1329 | port->mstb, to_find); | |
ad7f8a1f DA |
1330 | if (mport) |
1331 | return mport; | |
1332 | } | |
1333 | } | |
1334 | return NULL; | |
1335 | } | |
1336 | ||
d0757afd LP |
1337 | static struct drm_dp_mst_port * |
1338 | drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr, | |
1339 | struct drm_dp_mst_port *port) | |
ad7f8a1f DA |
1340 | { |
1341 | struct drm_dp_mst_port *rport = NULL; | |
ebcc0e6b | 1342 | |
ad7f8a1f | 1343 | mutex_lock(&mgr->lock); |
ebcc0e6b LP |
1344 | if (mgr->mst_primary) { |
1345 | rport = drm_dp_mst_topology_get_port_validated_locked( | |
1346 | mgr->mst_primary, port); | |
1347 | ||
1348 | if (rport && !drm_dp_mst_topology_try_get_port(rport)) | |
1349 | rport = NULL; | |
1350 | } | |
ad7f8a1f DA |
1351 | mutex_unlock(&mgr->lock); |
1352 | return rport; | |
1353 | } | |
1354 | ||
1355 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) | |
1356 | { | |
1357 | struct drm_dp_mst_port *port; | |
ebcc0e6b | 1358 | int ret; |
ad7f8a1f DA |
1359 | |
1360 | list_for_each_entry(port, &mstb->ports, next) { | |
1361 | if (port->port_num == port_num) { | |
ebcc0e6b LP |
1362 | ret = drm_dp_mst_topology_try_get_port(port); |
1363 | return ret ? port : NULL; | |
ad7f8a1f DA |
1364 | } |
1365 | } | |
1366 | ||
1367 | return NULL; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * calculate a new RAD for this MST branch device | |
1372 | * if parent has an LCT of 2 then it has 1 nibble of RAD, | |
1373 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, | |
1374 | */ | |
1375 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, | |
1376 | u8 *rad) | |
1377 | { | |
75af4c8c | 1378 | int parent_lct = port->parent->lct; |
ad7f8a1f | 1379 | int shift = 4; |
75af4c8c ML |
1380 | int idx = (parent_lct - 1) / 2; |
1381 | if (parent_lct > 1) { | |
1382 | memcpy(rad, port->parent->rad, idx + 1); | |
1383 | shift = (parent_lct % 2) ? 4 : 0; | |
ad7f8a1f DA |
1384 | } else |
1385 | rad[0] = 0; | |
1386 | ||
1387 | rad[idx] |= port->port_num << shift; | |
75af4c8c | 1388 | return parent_lct + 1; |
ad7f8a1f DA |
1389 | } |
1390 | ||
1391 | /* | |
1392 | * return sends link address for new mstb | |
1393 | */ | |
1394 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) | |
1395 | { | |
1396 | int ret; | |
1397 | u8 rad[6], lct; | |
1398 | bool send_link = false; | |
1399 | switch (port->pdt) { | |
1400 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
1401 | case DP_PEER_DEVICE_SST_SINK: | |
1402 | /* add i2c over sideband */ | |
1403 | ret = drm_dp_mst_register_i2c_bus(&port->aux); | |
1404 | break; | |
1405 | case DP_PEER_DEVICE_MST_BRANCHING: | |
1406 | lct = drm_dp_calculate_rad(port, rad); | |
1407 | ||
1408 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); | |
22a07038 JM |
1409 | if (port->mstb) { |
1410 | port->mstb->mgr = port->mgr; | |
1411 | port->mstb->port_parent = port; | |
ebcc0e6b LP |
1412 | /* |
1413 | * Make sure this port's memory allocation stays | |
1414 | * around until it's child MSTB releases it | |
1415 | */ | |
1416 | drm_dp_mst_get_port_malloc(port); | |
ad7f8a1f | 1417 | |
22a07038 JM |
1418 | send_link = true; |
1419 | } | |
ad7f8a1f DA |
1420 | break; |
1421 | } | |
1422 | return send_link; | |
1423 | } | |
1424 | ||
5e93b820 | 1425 | static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
ad7f8a1f DA |
1426 | { |
1427 | int ret; | |
5e93b820 HW |
1428 | |
1429 | memcpy(mstb->guid, guid, 16); | |
1430 | ||
1431 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { | |
1432 | if (mstb->port_parent) { | |
1433 | ret = drm_dp_send_dpcd_write( | |
1434 | mstb->mgr, | |
1435 | mstb->port_parent, | |
1436 | DP_GUID, | |
1437 | 16, | |
1438 | mstb->guid); | |
1439 | } else { | |
1440 | ||
1441 | ret = drm_dp_dpcd_write( | |
1442 | mstb->mgr->aux, | |
1443 | DP_GUID, | |
1444 | mstb->guid, | |
1445 | 16); | |
ad7f8a1f DA |
1446 | } |
1447 | } | |
1448 | } | |
1449 | ||
1c960876 DA |
1450 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
1451 | int pnum, | |
d87af4d1 RS |
1452 | char *proppath, |
1453 | size_t proppath_size) | |
ad7f8a1f DA |
1454 | { |
1455 | int i; | |
1456 | char temp[8]; | |
d87af4d1 | 1457 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
ad7f8a1f DA |
1458 | for (i = 0; i < (mstb->lct - 1); i++) { |
1459 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1460 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
d87af4d1 RS |
1461 | snprintf(temp, sizeof(temp), "-%d", port_num); |
1462 | strlcat(proppath, temp, proppath_size); | |
ad7f8a1f | 1463 | } |
1c960876 | 1464 | snprintf(temp, sizeof(temp), "-%d", pnum); |
d87af4d1 | 1465 | strlcat(proppath, temp, proppath_size); |
ad7f8a1f DA |
1466 | } |
1467 | ||
1468 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, | |
7b0a89a6 | 1469 | struct drm_device *dev, |
ad7f8a1f DA |
1470 | struct drm_dp_link_addr_reply_port *port_msg) |
1471 | { | |
1472 | struct drm_dp_mst_port *port; | |
1473 | bool ret; | |
1474 | bool created = false; | |
1475 | int old_pdt = 0; | |
1476 | int old_ddps = 0; | |
ebcc0e6b | 1477 | |
ad7f8a1f DA |
1478 | port = drm_dp_get_port(mstb, port_msg->port_number); |
1479 | if (!port) { | |
1480 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
1481 | if (!port) | |
1482 | return; | |
ebcc0e6b LP |
1483 | kref_init(&port->topology_kref); |
1484 | kref_init(&port->malloc_kref); | |
ad7f8a1f DA |
1485 | port->parent = mstb; |
1486 | port->port_num = port_msg->port_number; | |
1487 | port->mgr = mstb->mgr; | |
1488 | port->aux.name = "DPMST"; | |
7b0a89a6 | 1489 | port->aux.dev = dev->dev; |
ebcc0e6b LP |
1490 | |
1491 | /* | |
1492 | * Make sure the memory allocation for our parent branch stays | |
1493 | * around until our own memory allocation is released | |
1494 | */ | |
1495 | drm_dp_mst_get_mstb_malloc(mstb); | |
1496 | ||
ad7f8a1f DA |
1497 | created = true; |
1498 | } else { | |
1499 | old_pdt = port->pdt; | |
1500 | old_ddps = port->ddps; | |
1501 | } | |
1502 | ||
1503 | port->pdt = port_msg->peer_device_type; | |
1504 | port->input = port_msg->input_port; | |
1505 | port->mcs = port_msg->mcs; | |
1506 | port->ddps = port_msg->ddps; | |
1507 | port->ldps = port_msg->legacy_device_plug_status; | |
1508 | port->dpcd_rev = port_msg->dpcd_revision; | |
1509 | port->num_sdp_streams = port_msg->num_sdp_streams; | |
1510 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; | |
ad7f8a1f DA |
1511 | |
1512 | /* manage mstb port lists with mgr lock - take a reference | |
1513 | for this list */ | |
1514 | if (created) { | |
1515 | mutex_lock(&mstb->mgr->lock); | |
ebcc0e6b | 1516 | drm_dp_mst_topology_get_port(port); |
ad7f8a1f DA |
1517 | list_add(&port->next, &mstb->ports); |
1518 | mutex_unlock(&mstb->mgr->lock); | |
1519 | } | |
1520 | ||
1521 | if (old_ddps != port->ddps) { | |
1522 | if (port->ddps) { | |
3d76df63 LP |
1523 | if (!port->input) { |
1524 | drm_dp_send_enum_path_resources(mstb->mgr, | |
1525 | mstb, port); | |
1526 | } | |
ad7f8a1f | 1527 | } else { |
ad7f8a1f | 1528 | port->available_pbn = 0; |
3d76df63 | 1529 | } |
ad7f8a1f DA |
1530 | } |
1531 | ||
1532 | if (old_pdt != port->pdt && !port->input) { | |
1533 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1534 | ||
1535 | ret = drm_dp_port_setup_pdt(port); | |
68d8c9fc | 1536 | if (ret == true) |
ad7f8a1f | 1537 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
ad7f8a1f DA |
1538 | } |
1539 | ||
1540 | if (created && !port->input) { | |
1541 | char proppath[255]; | |
1c960876 | 1542 | |
3d76df63 LP |
1543 | build_mst_prop_path(mstb, port->port_num, proppath, |
1544 | sizeof(proppath)); | |
1545 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, | |
1546 | port, | |
1547 | proppath); | |
df4839fd DA |
1548 | if (!port->connector) { |
1549 | /* remove it from the port list */ | |
1550 | mutex_lock(&mstb->mgr->lock); | |
1551 | list_del(&port->next); | |
1552 | mutex_unlock(&mstb->mgr->lock); | |
1553 | /* drop port list reference */ | |
d0757afd | 1554 | drm_dp_mst_topology_put_port(port); |
df4839fd DA |
1555 | goto out; |
1556 | } | |
4da5caa6 VS |
1557 | if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || |
1558 | port->pdt == DP_PEER_DEVICE_SST_SINK) && | |
1559 | port->port_num >= DP_MST_LOGICAL_PORT_0) { | |
3d76df63 LP |
1560 | port->cached_edid = drm_get_edid(port->connector, |
1561 | &port->aux.ddc); | |
97e14fbe | 1562 | drm_connector_set_tile_property(port->connector); |
8ae22cb4 | 1563 | } |
d9515c5e | 1564 | (*mstb->mgr->cbs->register_connector)(port->connector); |
ad7f8a1f | 1565 | } |
8ae22cb4 | 1566 | |
df4839fd | 1567 | out: |
ad7f8a1f | 1568 | /* put reference to this port */ |
d0757afd | 1569 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
1570 | } |
1571 | ||
1572 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, | |
1573 | struct drm_dp_connection_status_notify *conn_stat) | |
1574 | { | |
1575 | struct drm_dp_mst_port *port; | |
1576 | int old_pdt; | |
1577 | int old_ddps; | |
1578 | bool dowork = false; | |
1579 | port = drm_dp_get_port(mstb, conn_stat->port_number); | |
1580 | if (!port) | |
1581 | return; | |
1582 | ||
1583 | old_ddps = port->ddps; | |
1584 | old_pdt = port->pdt; | |
1585 | port->pdt = conn_stat->peer_device_type; | |
1586 | port->mcs = conn_stat->message_capability_status; | |
1587 | port->ldps = conn_stat->legacy_device_plug_status; | |
1588 | port->ddps = conn_stat->displayport_device_plug_status; | |
1589 | ||
1590 | if (old_ddps != port->ddps) { | |
1591 | if (port->ddps) { | |
8ae22cb4 | 1592 | dowork = true; |
ad7f8a1f | 1593 | } else { |
ad7f8a1f DA |
1594 | port->available_pbn = 0; |
1595 | } | |
1596 | } | |
1597 | if (old_pdt != port->pdt && !port->input) { | |
1598 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1599 | ||
1600 | if (drm_dp_port_setup_pdt(port)) | |
1601 | dowork = true; | |
1602 | } | |
1603 | ||
d0757afd | 1604 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
1605 | if (dowork) |
1606 | queue_work(system_long_wq, &mstb->mgr->work); | |
1607 | ||
1608 | } | |
1609 | ||
1610 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, | |
1611 | u8 lct, u8 *rad) | |
1612 | { | |
1613 | struct drm_dp_mst_branch *mstb; | |
1614 | struct drm_dp_mst_port *port; | |
ebcc0e6b | 1615 | int i, ret; |
ad7f8a1f | 1616 | /* find the port by iterating down */ |
9eb1e57f DA |
1617 | |
1618 | mutex_lock(&mgr->lock); | |
ad7f8a1f DA |
1619 | mstb = mgr->mst_primary; |
1620 | ||
23d80039 SL |
1621 | if (!mstb) |
1622 | goto out; | |
1623 | ||
ad7f8a1f DA |
1624 | for (i = 0; i < lct - 1; i++) { |
1625 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1626 | int port_num = (rad[i / 2] >> shift) & 0xf; |
ad7f8a1f DA |
1627 | |
1628 | list_for_each_entry(port, &mstb->ports, next) { | |
1629 | if (port->port_num == port_num) { | |
30730c7f AR |
1630 | mstb = port->mstb; |
1631 | if (!mstb) { | |
ad7f8a1f | 1632 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
30730c7f | 1633 | goto out; |
ad7f8a1f DA |
1634 | } |
1635 | ||
ad7f8a1f DA |
1636 | break; |
1637 | } | |
1638 | } | |
1639 | } | |
ebcc0e6b LP |
1640 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
1641 | if (!ret) | |
1642 | mstb = NULL; | |
30730c7f | 1643 | out: |
9eb1e57f | 1644 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
1645 | return mstb; |
1646 | } | |
1647 | ||
bd934320 ML |
1648 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
1649 | struct drm_dp_mst_branch *mstb, | |
1650 | uint8_t *guid) | |
1651 | { | |
1652 | struct drm_dp_mst_branch *found_mstb; | |
1653 | struct drm_dp_mst_port *port; | |
1654 | ||
5e93b820 HW |
1655 | if (memcmp(mstb->guid, guid, 16) == 0) |
1656 | return mstb; | |
1657 | ||
1658 | ||
bd934320 ML |
1659 | list_for_each_entry(port, &mstb->ports, next) { |
1660 | if (!port->mstb) | |
1661 | continue; | |
1662 | ||
bd934320 ML |
1663 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
1664 | ||
1665 | if (found_mstb) | |
1666 | return found_mstb; | |
1667 | } | |
1668 | ||
1669 | return NULL; | |
1670 | } | |
1671 | ||
de6d6818 LP |
1672 | static struct drm_dp_mst_branch * |
1673 | drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, | |
1674 | uint8_t *guid) | |
bd934320 ML |
1675 | { |
1676 | struct drm_dp_mst_branch *mstb; | |
ebcc0e6b | 1677 | int ret; |
bd934320 ML |
1678 | |
1679 | /* find the port by iterating down */ | |
1680 | mutex_lock(&mgr->lock); | |
1681 | ||
5e93b820 | 1682 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
ebcc0e6b LP |
1683 | if (mstb) { |
1684 | ret = drm_dp_mst_topology_try_get_mstb(mstb); | |
1685 | if (!ret) | |
1686 | mstb = NULL; | |
1687 | } | |
bd934320 ML |
1688 | |
1689 | mutex_unlock(&mgr->lock); | |
1690 | return mstb; | |
1691 | } | |
1692 | ||
ad7f8a1f DA |
1693 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1694 | struct drm_dp_mst_branch *mstb) | |
1695 | { | |
1696 | struct drm_dp_mst_port *port; | |
9254ec49 | 1697 | struct drm_dp_mst_branch *mstb_child; |
68d8c9fc | 1698 | if (!mstb->link_address_sent) |
ad7f8a1f | 1699 | drm_dp_send_link_address(mgr, mstb); |
68d8c9fc | 1700 | |
ad7f8a1f DA |
1701 | list_for_each_entry(port, &mstb->ports, next) { |
1702 | if (port->input) | |
1703 | continue; | |
1704 | ||
8ae22cb4 | 1705 | if (!port->ddps) |
ad7f8a1f DA |
1706 | continue; |
1707 | ||
1708 | if (!port->available_pbn) | |
1709 | drm_dp_send_enum_path_resources(mgr, mstb, port); | |
1710 | ||
9254ec49 | 1711 | if (port->mstb) { |
d0757afd LP |
1712 | mstb_child = drm_dp_mst_topology_get_mstb_validated( |
1713 | mgr, port->mstb); | |
9254ec49 DV |
1714 | if (mstb_child) { |
1715 | drm_dp_check_and_send_link_address(mgr, mstb_child); | |
d0757afd | 1716 | drm_dp_mst_topology_put_mstb(mstb_child); |
9254ec49 DV |
1717 | } |
1718 | } | |
ad7f8a1f DA |
1719 | } |
1720 | } | |
1721 | ||
1722 | static void drm_dp_mst_link_probe_work(struct work_struct *work) | |
1723 | { | |
1724 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); | |
9254ec49 | 1725 | struct drm_dp_mst_branch *mstb; |
ebcc0e6b | 1726 | int ret; |
ad7f8a1f | 1727 | |
9254ec49 DV |
1728 | mutex_lock(&mgr->lock); |
1729 | mstb = mgr->mst_primary; | |
1730 | if (mstb) { | |
ebcc0e6b LP |
1731 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
1732 | if (!ret) | |
1733 | mstb = NULL; | |
9254ec49 DV |
1734 | } |
1735 | mutex_unlock(&mgr->lock); | |
1736 | if (mstb) { | |
1737 | drm_dp_check_and_send_link_address(mgr, mstb); | |
d0757afd | 1738 | drm_dp_mst_topology_put_mstb(mstb); |
9254ec49 | 1739 | } |
ad7f8a1f DA |
1740 | } |
1741 | ||
1742 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
1743 | u8 *guid) | |
1744 | { | |
e38e1289 | 1745 | u64 salt; |
ad7f8a1f | 1746 | |
e38e1289 VS |
1747 | if (memchr_inv(guid, 0, 16)) |
1748 | return true; | |
1749 | ||
1750 | salt = get_jiffies_64(); | |
1751 | ||
1752 | memcpy(&guid[0], &salt, sizeof(u64)); | |
1753 | memcpy(&guid[8], &salt, sizeof(u64)); | |
1754 | ||
1755 | return false; | |
ad7f8a1f DA |
1756 | } |
1757 | ||
1758 | #if 0 | |
1759 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) | |
1760 | { | |
1761 | struct drm_dp_sideband_msg_req_body req; | |
1762 | ||
1763 | req.req_type = DP_REMOTE_DPCD_READ; | |
1764 | req.u.dpcd_read.port_number = port_num; | |
1765 | req.u.dpcd_read.dpcd_address = offset; | |
1766 | req.u.dpcd_read.num_bytes = num_bytes; | |
1767 | drm_dp_encode_sideband_req(&req, msg); | |
1768 | ||
1769 | return 0; | |
1770 | } | |
1771 | #endif | |
1772 | ||
1773 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, | |
1774 | bool up, u8 *msg, int len) | |
1775 | { | |
1776 | int ret; | |
1777 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; | |
1778 | int tosend, total, offset; | |
1779 | int retries = 0; | |
1780 | ||
1781 | retry: | |
1782 | total = len; | |
1783 | offset = 0; | |
1784 | do { | |
1785 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); | |
1786 | ||
1787 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, | |
1788 | &msg[offset], | |
1789 | tosend); | |
1790 | if (ret != tosend) { | |
1791 | if (ret == -EIO && retries < 5) { | |
1792 | retries++; | |
1793 | goto retry; | |
1794 | } | |
1795 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); | |
ad7f8a1f DA |
1796 | |
1797 | return -EIO; | |
1798 | } | |
1799 | offset += tosend; | |
1800 | total -= tosend; | |
1801 | } while (total > 0); | |
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, | |
1806 | struct drm_dp_sideband_msg_tx *txmsg) | |
1807 | { | |
1808 | struct drm_dp_mst_branch *mstb = txmsg->dst; | |
bd934320 | 1809 | u8 req_type; |
ad7f8a1f DA |
1810 | |
1811 | /* both msg slots are full */ | |
1812 | if (txmsg->seqno == -1) { | |
1813 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { | |
1814 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); | |
1815 | return -EAGAIN; | |
1816 | } | |
1817 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { | |
1818 | txmsg->seqno = mstb->last_seqno; | |
1819 | mstb->last_seqno ^= 1; | |
1820 | } else if (mstb->tx_slots[0] == NULL) | |
1821 | txmsg->seqno = 0; | |
1822 | else | |
1823 | txmsg->seqno = 1; | |
1824 | mstb->tx_slots[txmsg->seqno] = txmsg; | |
1825 | } | |
bd934320 ML |
1826 | |
1827 | req_type = txmsg->msg[0] & 0x7f; | |
1828 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || | |
1829 | req_type == DP_RESOURCE_STATUS_NOTIFY) | |
1830 | hdr->broadcast = 1; | |
1831 | else | |
1832 | hdr->broadcast = 0; | |
ad7f8a1f DA |
1833 | hdr->path_msg = txmsg->path_msg; |
1834 | hdr->lct = mstb->lct; | |
1835 | hdr->lcr = mstb->lct - 1; | |
1836 | if (mstb->lct > 1) | |
1837 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); | |
1838 | hdr->seqno = txmsg->seqno; | |
1839 | return 0; | |
1840 | } | |
1841 | /* | |
1842 | * process a single block of the next message in the sideband queue | |
1843 | */ | |
1844 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, | |
1845 | struct drm_dp_sideband_msg_tx *txmsg, | |
1846 | bool up) | |
1847 | { | |
1848 | u8 chunk[48]; | |
1849 | struct drm_dp_sideband_msg_hdr hdr; | |
1850 | int len, space, idx, tosend; | |
1851 | int ret; | |
1852 | ||
bf3719c0 DL |
1853 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
1854 | ||
ad7f8a1f DA |
1855 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
1856 | txmsg->seqno = -1; | |
1857 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; | |
1858 | } | |
1859 | ||
1860 | /* make hdr from dst mst - for replies use seqno | |
1861 | otherwise assign one */ | |
1862 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); | |
1863 | if (ret < 0) | |
1864 | return ret; | |
1865 | ||
1866 | /* amount left to send in this message */ | |
1867 | len = txmsg->cur_len - txmsg->cur_offset; | |
1868 | ||
1869 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ | |
1870 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); | |
1871 | ||
1872 | tosend = min(len, space); | |
1873 | if (len == txmsg->cur_len) | |
1874 | hdr.somt = 1; | |
1875 | if (space >= len) | |
1876 | hdr.eomt = 1; | |
1877 | ||
1878 | ||
1879 | hdr.msg_len = tosend + 1; | |
1880 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); | |
1881 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); | |
1882 | /* add crc at end */ | |
1883 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); | |
1884 | idx += tosend + 1; | |
1885 | ||
1886 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); | |
1887 | if (ret) { | |
1888 | DRM_DEBUG_KMS("sideband msg failed to send\n"); | |
1889 | return ret; | |
1890 | } | |
1891 | ||
1892 | txmsg->cur_offset += tosend; | |
1893 | if (txmsg->cur_offset == txmsg->cur_len) { | |
1894 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; | |
1895 | return 1; | |
1896 | } | |
1897 | return 0; | |
1898 | } | |
1899 | ||
ad7f8a1f DA |
1900 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
1901 | { | |
1902 | struct drm_dp_sideband_msg_tx *txmsg; | |
1903 | int ret; | |
1904 | ||
cd961bb9 DV |
1905 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
1906 | ||
ad7f8a1f | 1907 | /* construct a chunk from the first msg in the tx_msg queue */ |
cb021a3e | 1908 | if (list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f | 1909 | return; |
ad7f8a1f DA |
1910 | |
1911 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); | |
1912 | ret = process_single_tx_qlock(mgr, txmsg, false); | |
1913 | if (ret == 1) { | |
1914 | /* txmsg is sent it should be in the slots now */ | |
1915 | list_del(&txmsg->next); | |
1916 | } else if (ret) { | |
1917 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); | |
1918 | list_del(&txmsg->next); | |
1919 | if (txmsg->seqno != -1) | |
1920 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
1921 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
68e989dc | 1922 | wake_up_all(&mgr->tx_waitq); |
ad7f8a1f | 1923 | } |
ad7f8a1f DA |
1924 | } |
1925 | ||
1926 | /* called holding qlock */ | |
1f16ee7f ML |
1927 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
1928 | struct drm_dp_sideband_msg_tx *txmsg) | |
ad7f8a1f | 1929 | { |
ad7f8a1f DA |
1930 | int ret; |
1931 | ||
1932 | /* construct a chunk from the first msg in the tx_msg queue */ | |
ad7f8a1f | 1933 | ret = process_single_tx_qlock(mgr, txmsg, true); |
1f16ee7f ML |
1934 | |
1935 | if (ret != 1) | |
ad7f8a1f | 1936 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
1f16ee7f ML |
1937 | |
1938 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
ad7f8a1f DA |
1939 | } |
1940 | ||
1941 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, | |
1942 | struct drm_dp_sideband_msg_tx *txmsg) | |
1943 | { | |
1944 | mutex_lock(&mgr->qlock); | |
1945 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); | |
cb021a3e | 1946 | if (list_is_singular(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
1947 | process_single_down_tx_qlock(mgr); |
1948 | mutex_unlock(&mgr->qlock); | |
1949 | } | |
1950 | ||
68d8c9fc DA |
1951 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1952 | struct drm_dp_mst_branch *mstb) | |
ad7f8a1f DA |
1953 | { |
1954 | int len; | |
1955 | struct drm_dp_sideband_msg_tx *txmsg; | |
1956 | int ret; | |
1957 | ||
1958 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1959 | if (!txmsg) | |
68d8c9fc | 1960 | return; |
ad7f8a1f DA |
1961 | |
1962 | txmsg->dst = mstb; | |
1963 | len = build_link_address(txmsg); | |
1964 | ||
68d8c9fc | 1965 | mstb->link_address_sent = true; |
ad7f8a1f DA |
1966 | drm_dp_queue_down_tx(mgr, txmsg); |
1967 | ||
1968 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1969 | if (ret > 0) { | |
1970 | int i; | |
1971 | ||
1972 | if (txmsg->reply.reply_type == 1) | |
1973 | DRM_DEBUG_KMS("link address nak received\n"); | |
1974 | else { | |
1975 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); | |
1976 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { | |
1977 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, | |
1978 | txmsg->reply.u.link_addr.ports[i].input_port, | |
1979 | txmsg->reply.u.link_addr.ports[i].peer_device_type, | |
1980 | txmsg->reply.u.link_addr.ports[i].port_number, | |
1981 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, | |
1982 | txmsg->reply.u.link_addr.ports[i].mcs, | |
1983 | txmsg->reply.u.link_addr.ports[i].ddps, | |
1984 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, | |
1985 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, | |
1986 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); | |
1987 | } | |
5e93b820 HW |
1988 | |
1989 | drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); | |
1990 | ||
ad7f8a1f DA |
1991 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
1992 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); | |
1993 | } | |
16bff572 | 1994 | drm_kms_helper_hotplug_event(mgr->dev); |
ad7f8a1f | 1995 | } |
68d8c9fc DA |
1996 | } else { |
1997 | mstb->link_address_sent = false; | |
ad7f8a1f | 1998 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
68d8c9fc | 1999 | } |
ad7f8a1f DA |
2000 | |
2001 | kfree(txmsg); | |
ad7f8a1f DA |
2002 | } |
2003 | ||
2004 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
2005 | struct drm_dp_mst_branch *mstb, | |
2006 | struct drm_dp_mst_port *port) | |
2007 | { | |
2008 | int len; | |
2009 | struct drm_dp_sideband_msg_tx *txmsg; | |
2010 | int ret; | |
2011 | ||
2012 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2013 | if (!txmsg) | |
2014 | return -ENOMEM; | |
2015 | ||
2016 | txmsg->dst = mstb; | |
2017 | len = build_enum_path_resources(txmsg, port->port_num); | |
2018 | ||
2019 | drm_dp_queue_down_tx(mgr, txmsg); | |
2020 | ||
2021 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2022 | if (ret > 0) { | |
2023 | if (txmsg->reply.reply_type == 1) | |
2024 | DRM_DEBUG_KMS("enum path resources nak received\n"); | |
2025 | else { | |
2026 | if (port->port_num != txmsg->reply.u.path_resources.port_number) | |
2027 | DRM_ERROR("got incorrect port in response\n"); | |
2028 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, | |
2029 | txmsg->reply.u.path_resources.avail_payload_bw_number); | |
2030 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; | |
2031 | } | |
2032 | } | |
2033 | ||
2034 | kfree(txmsg); | |
2035 | return 0; | |
2036 | } | |
2037 | ||
91a25e46 ML |
2038 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
2039 | { | |
2040 | if (!mstb->port_parent) | |
2041 | return NULL; | |
2042 | ||
2043 | if (mstb->port_parent->mstb != mstb) | |
2044 | return mstb->port_parent; | |
2045 | ||
2046 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); | |
2047 | } | |
2048 | ||
56d1c14e LP |
2049 | /* |
2050 | * Searches upwards in the topology starting from mstb to try to find the | |
2051 | * closest available parent of mstb that's still connected to the rest of the | |
2052 | * topology. This can be used in order to perform operations like releasing | |
2053 | * payloads, where the branch device which owned the payload may no longer be | |
2054 | * around and thus would require that the payload on the last living relative | |
2055 | * be freed instead. | |
2056 | */ | |
2057 | static struct drm_dp_mst_branch * | |
2058 | drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, | |
2059 | struct drm_dp_mst_branch *mstb, | |
2060 | int *port_num) | |
91a25e46 ML |
2061 | { |
2062 | struct drm_dp_mst_branch *rmstb = NULL; | |
2063 | struct drm_dp_mst_port *found_port; | |
56d1c14e | 2064 | |
91a25e46 | 2065 | mutex_lock(&mgr->lock); |
56d1c14e LP |
2066 | if (!mgr->mst_primary) |
2067 | goto out; | |
2068 | ||
2069 | do { | |
91a25e46 | 2070 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
56d1c14e LP |
2071 | if (!found_port) |
2072 | break; | |
91a25e46 | 2073 | |
56d1c14e | 2074 | if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) { |
91a25e46 | 2075 | rmstb = found_port->parent; |
56d1c14e LP |
2076 | *port_num = found_port->port_num; |
2077 | } else { | |
2078 | /* Search again, starting from this parent */ | |
2079 | mstb = found_port->parent; | |
91a25e46 | 2080 | } |
56d1c14e LP |
2081 | } while (!rmstb); |
2082 | out: | |
91a25e46 ML |
2083 | mutex_unlock(&mgr->lock); |
2084 | return rmstb; | |
2085 | } | |
2086 | ||
8fa6a425 TR |
2087 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
2088 | struct drm_dp_mst_port *port, | |
2089 | int id, | |
2090 | int pbn) | |
ad7f8a1f DA |
2091 | { |
2092 | struct drm_dp_sideband_msg_tx *txmsg; | |
2093 | struct drm_dp_mst_branch *mstb; | |
91a25e46 | 2094 | int len, ret, port_num; |
ef8f9bea LY |
2095 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
2096 | int i; | |
ad7f8a1f | 2097 | |
d0757afd | 2098 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
deba0a2a | 2099 | if (!port) |
2100 | return -EINVAL; | |
2101 | ||
91a25e46 | 2102 | port_num = port->port_num; |
d0757afd | 2103 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
91a25e46 | 2104 | if (!mstb) { |
de6d6818 LP |
2105 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, |
2106 | port->parent, | |
2107 | &port_num); | |
91a25e46 | 2108 | |
deba0a2a | 2109 | if (!mstb) { |
d0757afd | 2110 | drm_dp_mst_topology_put_port(port); |
91a25e46 | 2111 | return -EINVAL; |
deba0a2a | 2112 | } |
91a25e46 | 2113 | } |
ad7f8a1f DA |
2114 | |
2115 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2116 | if (!txmsg) { | |
2117 | ret = -ENOMEM; | |
2118 | goto fail_put; | |
2119 | } | |
2120 | ||
ef8f9bea LY |
2121 | for (i = 0; i < port->num_sdp_streams; i++) |
2122 | sinks[i] = i; | |
2123 | ||
ad7f8a1f | 2124 | txmsg->dst = mstb; |
91a25e46 | 2125 | len = build_allocate_payload(txmsg, port_num, |
ad7f8a1f | 2126 | id, |
ef8f9bea | 2127 | pbn, port->num_sdp_streams, sinks); |
ad7f8a1f DA |
2128 | |
2129 | drm_dp_queue_down_tx(mgr, txmsg); | |
2130 | ||
56d1c14e LP |
2131 | /* |
2132 | * FIXME: there is a small chance that between getting the last | |
2133 | * connected mstb and sending the payload message, the last connected | |
2134 | * mstb could also be removed from the topology. In the future, this | |
2135 | * needs to be fixed by restarting the | |
2136 | * drm_dp_get_last_connected_port_and_mstb() search in the event of a | |
2137 | * timeout if the topology is still connected to the system. | |
2138 | */ | |
ad7f8a1f DA |
2139 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
2140 | if (ret > 0) { | |
de6d6818 | 2141 | if (txmsg->reply.reply_type == 1) |
ad7f8a1f | 2142 | ret = -EINVAL; |
de6d6818 | 2143 | else |
ad7f8a1f DA |
2144 | ret = 0; |
2145 | } | |
2146 | kfree(txmsg); | |
2147 | fail_put: | |
d0757afd LP |
2148 | drm_dp_mst_topology_put_mstb(mstb); |
2149 | drm_dp_mst_topology_put_port(port); | |
ad7f8a1f DA |
2150 | return ret; |
2151 | } | |
2152 | ||
0bb9c2b2 DP |
2153 | int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
2154 | struct drm_dp_mst_port *port, bool power_up) | |
2155 | { | |
2156 | struct drm_dp_sideband_msg_tx *txmsg; | |
2157 | int len, ret; | |
2158 | ||
d0757afd | 2159 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
0bb9c2b2 DP |
2160 | if (!port) |
2161 | return -EINVAL; | |
2162 | ||
2163 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2164 | if (!txmsg) { | |
d0757afd | 2165 | drm_dp_mst_topology_put_port(port); |
0bb9c2b2 DP |
2166 | return -ENOMEM; |
2167 | } | |
2168 | ||
2169 | txmsg->dst = port->parent; | |
2170 | len = build_power_updown_phy(txmsg, port->port_num, power_up); | |
2171 | drm_dp_queue_down_tx(mgr, txmsg); | |
2172 | ||
2173 | ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); | |
2174 | if (ret > 0) { | |
2175 | if (txmsg->reply.reply_type == 1) | |
2176 | ret = -EINVAL; | |
2177 | else | |
2178 | ret = 0; | |
2179 | } | |
2180 | kfree(txmsg); | |
d0757afd | 2181 | drm_dp_mst_topology_put_port(port); |
0bb9c2b2 DP |
2182 | |
2183 | return ret; | |
2184 | } | |
2185 | EXPORT_SYMBOL(drm_dp_send_power_updown_phy); | |
2186 | ||
ad7f8a1f DA |
2187 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
2188 | int id, | |
2189 | struct drm_dp_payload *payload) | |
2190 | { | |
2191 | int ret; | |
2192 | ||
2193 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); | |
2194 | if (ret < 0) { | |
2195 | payload->payload_state = 0; | |
2196 | return ret; | |
2197 | } | |
2198 | payload->payload_state = DP_PAYLOAD_LOCAL; | |
2199 | return 0; | |
2200 | } | |
2201 | ||
8fa6a425 TR |
2202 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
2203 | struct drm_dp_mst_port *port, | |
2204 | int id, | |
2205 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
2206 | { |
2207 | int ret; | |
2208 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); | |
2209 | if (ret < 0) | |
2210 | return ret; | |
2211 | payload->payload_state = DP_PAYLOAD_REMOTE; | |
2212 | return ret; | |
2213 | } | |
2214 | ||
8fa6a425 TR |
2215 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
2216 | struct drm_dp_mst_port *port, | |
2217 | int id, | |
2218 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
2219 | { |
2220 | DRM_DEBUG_KMS("\n"); | |
2221 | /* its okay for these to fail */ | |
2222 | if (port) { | |
2223 | drm_dp_payload_send_msg(mgr, port, id, 0); | |
2224 | } | |
2225 | ||
2226 | drm_dp_dpcd_write_payload(mgr, id, payload); | |
dfda0df3 | 2227 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
ad7f8a1f DA |
2228 | return 0; |
2229 | } | |
2230 | ||
8fa6a425 TR |
2231 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
2232 | int id, | |
2233 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
2234 | { |
2235 | payload->payload_state = 0; | |
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | /** | |
2240 | * drm_dp_update_payload_part1() - Execute payload update part 1 | |
2241 | * @mgr: manager to use. | |
2242 | * | |
2243 | * This iterates over all proposed virtual channels, and tries to | |
2244 | * allocate space in the link for them. For 0->slots transitions, | |
2245 | * this step just writes the VCPI to the MST device. For slots->0 | |
2246 | * transitions, this writes the updated VCPIs and removes the | |
2247 | * remote VC payloads. | |
2248 | * | |
2249 | * after calling this the driver should generate ACT and payload | |
2250 | * packets. | |
2251 | */ | |
2252 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) | |
2253 | { | |
dfda0df3 | 2254 | int i, j; |
ad7f8a1f DA |
2255 | int cur_slots = 1; |
2256 | struct drm_dp_payload req_payload; | |
2257 | struct drm_dp_mst_port *port; | |
2258 | ||
2259 | mutex_lock(&mgr->payload_lock); | |
2260 | for (i = 0; i < mgr->max_payloads; i++) { | |
706246c7 LP |
2261 | struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; |
2262 | struct drm_dp_payload *payload = &mgr->payloads[i]; | |
2263 | ||
ad7f8a1f DA |
2264 | /* solve the current payloads - compare to the hw ones |
2265 | - update the hw view */ | |
2266 | req_payload.start_slot = cur_slots; | |
706246c7 LP |
2267 | if (vcpi) { |
2268 | port = container_of(vcpi, struct drm_dp_mst_port, | |
2269 | vcpi); | |
d0757afd LP |
2270 | port = drm_dp_mst_topology_get_port_validated(mgr, |
2271 | port); | |
263efde3 | 2272 | if (!port) { |
2273 | mutex_unlock(&mgr->payload_lock); | |
2274 | return -EINVAL; | |
2275 | } | |
706246c7 LP |
2276 | req_payload.num_slots = vcpi->num_slots; |
2277 | req_payload.vcpi = vcpi->vcpi; | |
ad7f8a1f DA |
2278 | } else { |
2279 | port = NULL; | |
2280 | req_payload.num_slots = 0; | |
2281 | } | |
dfda0df3 | 2282 | |
706246c7 | 2283 | payload->start_slot = req_payload.start_slot; |
ad7f8a1f | 2284 | /* work out what is required to happen with this payload */ |
706246c7 | 2285 | if (payload->num_slots != req_payload.num_slots) { |
ad7f8a1f DA |
2286 | |
2287 | /* need to push an update for this payload */ | |
2288 | if (req_payload.num_slots) { | |
706246c7 LP |
2289 | drm_dp_create_payload_step1(mgr, vcpi->vcpi, |
2290 | &req_payload); | |
2291 | payload->num_slots = req_payload.num_slots; | |
2292 | payload->vcpi = req_payload.vcpi; | |
2293 | ||
2294 | } else if (payload->num_slots) { | |
2295 | payload->num_slots = 0; | |
2296 | drm_dp_destroy_payload_step1(mgr, port, | |
2297 | payload->vcpi, | |
2298 | payload); | |
2299 | req_payload.payload_state = | |
2300 | payload->payload_state; | |
2301 | payload->start_slot = 0; | |
dfda0df3 | 2302 | } |
706246c7 | 2303 | payload->payload_state = req_payload.payload_state; |
ad7f8a1f DA |
2304 | } |
2305 | cur_slots += req_payload.num_slots; | |
263efde3 | 2306 | |
2307 | if (port) | |
d0757afd | 2308 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f | 2309 | } |
dfda0df3 DA |
2310 | |
2311 | for (i = 0; i < mgr->max_payloads; i++) { | |
706246c7 LP |
2312 | if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) |
2313 | continue; | |
dfda0df3 | 2314 | |
706246c7 LP |
2315 | DRM_DEBUG_KMS("removing payload %d\n", i); |
2316 | for (j = i; j < mgr->max_payloads - 1; j++) { | |
2317 | mgr->payloads[j] = mgr->payloads[j + 1]; | |
2318 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; | |
2319 | ||
2320 | if (mgr->proposed_vcpis[j] && | |
2321 | mgr->proposed_vcpis[j]->num_slots) { | |
2322 | set_bit(j + 1, &mgr->payload_mask); | |
2323 | } else { | |
2324 | clear_bit(j + 1, &mgr->payload_mask); | |
2325 | } | |
dfda0df3 | 2326 | } |
706246c7 LP |
2327 | |
2328 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, | |
2329 | sizeof(struct drm_dp_payload)); | |
2330 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; | |
2331 | clear_bit(mgr->max_payloads, &mgr->payload_mask); | |
dfda0df3 | 2332 | } |
ad7f8a1f DA |
2333 | mutex_unlock(&mgr->payload_lock); |
2334 | ||
2335 | return 0; | |
2336 | } | |
2337 | EXPORT_SYMBOL(drm_dp_update_payload_part1); | |
2338 | ||
2339 | /** | |
2340 | * drm_dp_update_payload_part2() - Execute payload update part 2 | |
2341 | * @mgr: manager to use. | |
2342 | * | |
2343 | * This iterates over all proposed virtual channels, and tries to | |
2344 | * allocate space in the link for them. For 0->slots transitions, | |
2345 | * this step writes the remote VC payload commands. For slots->0 | |
2346 | * this just resets some internal state. | |
2347 | */ | |
2348 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) | |
2349 | { | |
2350 | struct drm_dp_mst_port *port; | |
2351 | int i; | |
7389ad4b | 2352 | int ret = 0; |
ad7f8a1f DA |
2353 | mutex_lock(&mgr->payload_lock); |
2354 | for (i = 0; i < mgr->max_payloads; i++) { | |
2355 | ||
2356 | if (!mgr->proposed_vcpis[i]) | |
2357 | continue; | |
2358 | ||
2359 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
2360 | ||
2361 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); | |
2362 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { | |
dfda0df3 | 2363 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f | 2364 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
dfda0df3 | 2365 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f DA |
2366 | } |
2367 | if (ret) { | |
2368 | mutex_unlock(&mgr->payload_lock); | |
2369 | return ret; | |
2370 | } | |
2371 | } | |
2372 | mutex_unlock(&mgr->payload_lock); | |
2373 | return 0; | |
2374 | } | |
2375 | EXPORT_SYMBOL(drm_dp_update_payload_part2); | |
2376 | ||
2377 | #if 0 /* unused as of yet */ | |
2378 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, | |
2379 | struct drm_dp_mst_port *port, | |
2380 | int offset, int size) | |
2381 | { | |
2382 | int len; | |
2383 | struct drm_dp_sideband_msg_tx *txmsg; | |
2384 | ||
2385 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2386 | if (!txmsg) | |
2387 | return -ENOMEM; | |
2388 | ||
2389 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); | |
2390 | txmsg->dst = port->parent; | |
2391 | ||
2392 | drm_dp_queue_down_tx(mgr, txmsg); | |
2393 | ||
2394 | return 0; | |
2395 | } | |
2396 | #endif | |
2397 | ||
2398 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
2399 | struct drm_dp_mst_port *port, | |
2400 | int offset, int size, u8 *bytes) | |
2401 | { | |
2402 | int len; | |
2403 | int ret; | |
2404 | struct drm_dp_sideband_msg_tx *txmsg; | |
2405 | struct drm_dp_mst_branch *mstb; | |
2406 | ||
d0757afd | 2407 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
ad7f8a1f DA |
2408 | if (!mstb) |
2409 | return -EINVAL; | |
2410 | ||
2411 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2412 | if (!txmsg) { | |
2413 | ret = -ENOMEM; | |
2414 | goto fail_put; | |
2415 | } | |
2416 | ||
2417 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); | |
2418 | txmsg->dst = mstb; | |
2419 | ||
2420 | drm_dp_queue_down_tx(mgr, txmsg); | |
2421 | ||
2422 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
2423 | if (ret > 0) { | |
2424 | if (txmsg->reply.reply_type == 1) { | |
2425 | ret = -EINVAL; | |
2426 | } else | |
2427 | ret = 0; | |
2428 | } | |
2429 | kfree(txmsg); | |
2430 | fail_put: | |
d0757afd | 2431 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
2432 | return ret; |
2433 | } | |
2434 | ||
2435 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) | |
2436 | { | |
2437 | struct drm_dp_sideband_msg_reply_body reply; | |
2438 | ||
a68d2437 | 2439 | reply.reply_type = 0; |
ad7f8a1f DA |
2440 | reply.req_type = req_type; |
2441 | drm_dp_encode_sideband_reply(&reply, msg); | |
2442 | return 0; | |
2443 | } | |
2444 | ||
2445 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, | |
2446 | struct drm_dp_mst_branch *mstb, | |
2447 | int req_type, int seqno, bool broadcast) | |
2448 | { | |
2449 | struct drm_dp_sideband_msg_tx *txmsg; | |
2450 | ||
2451 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
2452 | if (!txmsg) | |
2453 | return -ENOMEM; | |
2454 | ||
2455 | txmsg->dst = mstb; | |
2456 | txmsg->seqno = seqno; | |
2457 | drm_dp_encode_up_ack_reply(txmsg, req_type); | |
2458 | ||
2459 | mutex_lock(&mgr->qlock); | |
1f16ee7f ML |
2460 | |
2461 | process_single_up_tx_qlock(mgr, txmsg); | |
2462 | ||
ad7f8a1f | 2463 | mutex_unlock(&mgr->qlock); |
1f16ee7f ML |
2464 | |
2465 | kfree(txmsg); | |
ad7f8a1f DA |
2466 | return 0; |
2467 | } | |
2468 | ||
b853fdb3 CW |
2469 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
2470 | int dp_link_count, | |
2471 | int *out) | |
ad7f8a1f DA |
2472 | { |
2473 | switch (dp_link_bw) { | |
b853fdb3 CW |
2474 | default: |
2475 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", | |
2476 | dp_link_bw, dp_link_count); | |
2477 | return false; | |
2478 | ||
ad7f8a1f | 2479 | case DP_LINK_BW_1_62: |
b853fdb3 CW |
2480 | *out = 3 * dp_link_count; |
2481 | break; | |
ad7f8a1f | 2482 | case DP_LINK_BW_2_7: |
b853fdb3 CW |
2483 | *out = 5 * dp_link_count; |
2484 | break; | |
ad7f8a1f | 2485 | case DP_LINK_BW_5_4: |
b853fdb3 CW |
2486 | *out = 10 * dp_link_count; |
2487 | break; | |
e0bd878a MN |
2488 | case DP_LINK_BW_8_1: |
2489 | *out = 15 * dp_link_count; | |
2490 | break; | |
ad7f8a1f | 2491 | } |
b853fdb3 | 2492 | return true; |
ad7f8a1f DA |
2493 | } |
2494 | ||
2495 | /** | |
2496 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager | |
2497 | * @mgr: manager to set state for | |
2498 | * @mst_state: true to enable MST on this connector - false to disable. | |
2499 | * | |
2500 | * This is called by the driver when it detects an MST capable device plugged | |
2501 | * into a DP MST capable port, or when a DP MST capable device is unplugged. | |
2502 | */ | |
2503 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) | |
2504 | { | |
2505 | int ret = 0; | |
2506 | struct drm_dp_mst_branch *mstb = NULL; | |
2507 | ||
2508 | mutex_lock(&mgr->lock); | |
2509 | if (mst_state == mgr->mst_state) | |
2510 | goto out_unlock; | |
2511 | ||
2512 | mgr->mst_state = mst_state; | |
2513 | /* set the device into MST mode */ | |
2514 | if (mst_state) { | |
2515 | WARN_ON(mgr->mst_primary); | |
2516 | ||
2517 | /* get dpcd info */ | |
2518 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
2519 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
2520 | DRM_DEBUG_KMS("failed to read DPCD\n"); | |
2521 | goto out_unlock; | |
2522 | } | |
2523 | ||
b853fdb3 CW |
2524 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
2525 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, | |
2526 | &mgr->pbn_div)) { | |
2527 | ret = -EINVAL; | |
2528 | goto out_unlock; | |
2529 | } | |
2530 | ||
ad7f8a1f DA |
2531 | /* add initial branch device at LCT 1 */ |
2532 | mstb = drm_dp_add_mst_branch_device(1, NULL); | |
2533 | if (mstb == NULL) { | |
2534 | ret = -ENOMEM; | |
2535 | goto out_unlock; | |
2536 | } | |
2537 | mstb->mgr = mgr; | |
2538 | ||
2539 | /* give this the main reference */ | |
2540 | mgr->mst_primary = mstb; | |
ebcc0e6b | 2541 | drm_dp_mst_topology_get_mstb(mgr->mst_primary); |
ad7f8a1f | 2542 | |
c175cd16 AG |
2543 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
2544 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2545 | if (ret < 0) { | |
2546 | goto out_unlock; | |
2547 | } | |
2548 | ||
ad7f8a1f DA |
2549 | { |
2550 | struct drm_dp_payload reset_pay; | |
2551 | reset_pay.start_slot = 0; | |
2552 | reset_pay.num_slots = 0x3f; | |
2553 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); | |
2554 | } | |
2555 | ||
ad7f8a1f DA |
2556 | queue_work(system_long_wq, &mgr->work); |
2557 | ||
2558 | ret = 0; | |
2559 | } else { | |
2560 | /* disable MST on the device */ | |
2561 | mstb = mgr->mst_primary; | |
2562 | mgr->mst_primary = NULL; | |
2563 | /* this can fail if the device is gone */ | |
2564 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); | |
2565 | ret = 0; | |
2566 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); | |
2567 | mgr->payload_mask = 0; | |
2568 | set_bit(0, &mgr->payload_mask); | |
dfda0df3 | 2569 | mgr->vcpi_mask = 0; |
ad7f8a1f DA |
2570 | } |
2571 | ||
2572 | out_unlock: | |
2573 | mutex_unlock(&mgr->lock); | |
2574 | if (mstb) | |
d0757afd | 2575 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
2576 | return ret; |
2577 | ||
2578 | } | |
2579 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); | |
2580 | ||
2581 | /** | |
2582 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager | |
2583 | * @mgr: manager to suspend | |
2584 | * | |
2585 | * This function tells the MST device that we can't handle UP messages | |
2586 | * anymore. This should stop it from sending any since we are suspended. | |
2587 | */ | |
2588 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) | |
2589 | { | |
2590 | mutex_lock(&mgr->lock); | |
2591 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2592 | DP_MST_EN | DP_UPSTREAM_IS_SRC); | |
2593 | mutex_unlock(&mgr->lock); | |
274d8352 DA |
2594 | flush_work(&mgr->work); |
2595 | flush_work(&mgr->destroy_connector_work); | |
ad7f8a1f DA |
2596 | } |
2597 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); | |
2598 | ||
2599 | /** | |
2600 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager | |
2601 | * @mgr: manager to resume | |
2602 | * | |
2603 | * This will fetch DPCD and see if the device is still there, | |
2604 | * if it is, it will rewrite the MSTM control bits, and return. | |
2605 | * | |
2606 | * if the device fails this returns -1, and the driver should do | |
2607 | * a full MST reprobe, in case we were undocked. | |
2608 | */ | |
2609 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) | |
2610 | { | |
2611 | int ret = 0; | |
2612 | ||
2613 | mutex_lock(&mgr->lock); | |
2614 | ||
2615 | if (mgr->mst_primary) { | |
2616 | int sret; | |
1652fce6 L |
2617 | u8 guid[16]; |
2618 | ||
ad7f8a1f DA |
2619 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
2620 | if (sret != DP_RECEIVER_CAP_SIZE) { | |
2621 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2622 | ret = -1; | |
2623 | goto out_unlock; | |
2624 | } | |
2625 | ||
2626 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2627 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2628 | if (ret < 0) { | |
2629 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); | |
2630 | ret = -1; | |
2631 | goto out_unlock; | |
2632 | } | |
1652fce6 L |
2633 | |
2634 | /* Some hubs forget their guids after they resume */ | |
2635 | sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); | |
2636 | if (sret != 16) { | |
2637 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2638 | ret = -1; | |
2639 | goto out_unlock; | |
2640 | } | |
2641 | drm_dp_check_mstb_guid(mgr->mst_primary, guid); | |
2642 | ||
ad7f8a1f DA |
2643 | ret = 0; |
2644 | } else | |
2645 | ret = -1; | |
2646 | ||
2647 | out_unlock: | |
2648 | mutex_unlock(&mgr->lock); | |
2649 | return ret; | |
2650 | } | |
2651 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); | |
2652 | ||
636c4c3e | 2653 | static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
ad7f8a1f DA |
2654 | { |
2655 | int len; | |
2656 | u8 replyblock[32]; | |
2657 | int replylen, origlen, curreply; | |
2658 | int ret; | |
2659 | struct drm_dp_sideband_msg_rx *msg; | |
2660 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; | |
2661 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; | |
2662 | ||
2663 | len = min(mgr->max_dpcd_transaction_bytes, 16); | |
2664 | ret = drm_dp_dpcd_read(mgr->aux, basereg, | |
2665 | replyblock, len); | |
2666 | if (ret != len) { | |
2667 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); | |
636c4c3e | 2668 | return false; |
ad7f8a1f DA |
2669 | } |
2670 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); | |
2671 | if (!ret) { | |
2672 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); | |
636c4c3e | 2673 | return false; |
ad7f8a1f DA |
2674 | } |
2675 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; | |
2676 | ||
2677 | origlen = replylen; | |
2678 | replylen -= len; | |
2679 | curreply = len; | |
2680 | while (replylen > 0) { | |
2681 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); | |
2682 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, | |
2683 | replyblock, len); | |
2684 | if (ret != len) { | |
448421b5 ID |
2685 | DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", |
2686 | len, ret); | |
636c4c3e | 2687 | return false; |
ad7f8a1f | 2688 | } |
448421b5 | 2689 | |
ad7f8a1f | 2690 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
448421b5 | 2691 | if (!ret) { |
ad7f8a1f | 2692 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
636c4c3e | 2693 | return false; |
448421b5 ID |
2694 | } |
2695 | ||
ad7f8a1f DA |
2696 | curreply += len; |
2697 | replylen -= len; | |
2698 | } | |
636c4c3e | 2699 | return true; |
ad7f8a1f DA |
2700 | } |
2701 | ||
2702 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) | |
2703 | { | |
2704 | int ret = 0; | |
2705 | ||
636c4c3e ID |
2706 | if (!drm_dp_get_one_sb_msg(mgr, false)) { |
2707 | memset(&mgr->down_rep_recv, 0, | |
2708 | sizeof(struct drm_dp_sideband_msg_rx)); | |
2709 | return 0; | |
2710 | } | |
ad7f8a1f DA |
2711 | |
2712 | if (mgr->down_rep_recv.have_eomt) { | |
2713 | struct drm_dp_sideband_msg_tx *txmsg; | |
2714 | struct drm_dp_mst_branch *mstb; | |
2715 | int slot = -1; | |
2716 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2717 | mgr->down_rep_recv.initial_hdr.lct, | |
2718 | mgr->down_rep_recv.initial_hdr.rad); | |
2719 | ||
2720 | if (!mstb) { | |
2721 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); | |
2722 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | /* find the message */ | |
2727 | slot = mgr->down_rep_recv.initial_hdr.seqno; | |
2728 | mutex_lock(&mgr->qlock); | |
2729 | txmsg = mstb->tx_slots[slot]; | |
2730 | /* remove from slots */ | |
2731 | mutex_unlock(&mgr->qlock); | |
2732 | ||
2733 | if (!txmsg) { | |
2734 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", | |
2735 | mstb, | |
2736 | mgr->down_rep_recv.initial_hdr.seqno, | |
2737 | mgr->down_rep_recv.initial_hdr.lct, | |
2738 | mgr->down_rep_recv.initial_hdr.rad[0], | |
2739 | mgr->down_rep_recv.msg[0]); | |
d0757afd | 2740 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
2741 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
2742 | return 0; | |
2743 | } | |
2744 | ||
2745 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); | |
2746 | if (txmsg->reply.reply_type == 1) { | |
2747 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); | |
2748 | } | |
2749 | ||
2750 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
d0757afd | 2751 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
2752 | |
2753 | mutex_lock(&mgr->qlock); | |
2754 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; | |
2755 | mstb->tx_slots[slot] = NULL; | |
2756 | mutex_unlock(&mgr->qlock); | |
2757 | ||
68e989dc | 2758 | wake_up_all(&mgr->tx_waitq); |
ad7f8a1f DA |
2759 | } |
2760 | return ret; | |
2761 | } | |
2762 | ||
2763 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) | |
2764 | { | |
2765 | int ret = 0; | |
636c4c3e ID |
2766 | |
2767 | if (!drm_dp_get_one_sb_msg(mgr, true)) { | |
2768 | memset(&mgr->up_req_recv, 0, | |
2769 | sizeof(struct drm_dp_sideband_msg_rx)); | |
2770 | return 0; | |
2771 | } | |
ad7f8a1f DA |
2772 | |
2773 | if (mgr->up_req_recv.have_eomt) { | |
2774 | struct drm_dp_sideband_msg_req_body msg; | |
bd934320 | 2775 | struct drm_dp_mst_branch *mstb = NULL; |
ad7f8a1f | 2776 | bool seqno; |
bd934320 ML |
2777 | |
2778 | if (!mgr->up_req_recv.initial_hdr.broadcast) { | |
2779 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2780 | mgr->up_req_recv.initial_hdr.lct, | |
2781 | mgr->up_req_recv.initial_hdr.rad); | |
2782 | if (!mstb) { | |
2783 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2784 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2785 | return 0; | |
2786 | } | |
ad7f8a1f DA |
2787 | } |
2788 | ||
2789 | seqno = mgr->up_req_recv.initial_hdr.seqno; | |
2790 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); | |
2791 | ||
2792 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
bd934320 ML |
2793 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2794 | ||
2795 | if (!mstb) | |
2796 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); | |
2797 | ||
2798 | if (!mstb) { | |
2799 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2800 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2801 | return 0; | |
2802 | } | |
2803 | ||
ad7f8a1f | 2804 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
5e93b820 | 2805 | |
ad7f8a1f | 2806 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); |
16bff572 | 2807 | drm_kms_helper_hotplug_event(mgr->dev); |
8ae22cb4 | 2808 | |
ad7f8a1f | 2809 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
bd934320 ML |
2810 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2811 | if (!mstb) | |
2812 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); | |
2813 | ||
2814 | if (!mstb) { | |
2815 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2816 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2817 | return 0; | |
2818 | } | |
2819 | ||
ad7f8a1f DA |
2820 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
2821 | } | |
2822 | ||
7f8b3987 | 2823 | if (mstb) |
d0757afd | 2824 | drm_dp_mst_topology_put_mstb(mstb); |
7f8b3987 | 2825 | |
ad7f8a1f DA |
2826 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
2827 | } | |
2828 | return ret; | |
2829 | } | |
2830 | ||
2831 | /** | |
2832 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify | |
2833 | * @mgr: manager to notify irq for. | |
2834 | * @esi: 4 bytes from SINK_COUNT_ESI | |
295ee853 | 2835 | * @handled: whether the hpd interrupt was consumed or not |
ad7f8a1f DA |
2836 | * |
2837 | * This should be called from the driver when it detects a short IRQ, | |
2838 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The | |
2839 | * topology manager will process the sideband messages received as a result | |
2840 | * of this. | |
2841 | */ | |
2842 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) | |
2843 | { | |
2844 | int ret = 0; | |
2845 | int sc; | |
2846 | *handled = false; | |
2847 | sc = esi[0] & 0x3f; | |
2848 | ||
2849 | if (sc != mgr->sink_count) { | |
2850 | mgr->sink_count = sc; | |
2851 | *handled = true; | |
2852 | } | |
2853 | ||
2854 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { | |
2855 | ret = drm_dp_mst_handle_down_rep(mgr); | |
2856 | *handled = true; | |
2857 | } | |
2858 | ||
2859 | if (esi[1] & DP_UP_REQ_MSG_RDY) { | |
2860 | ret |= drm_dp_mst_handle_up_req(mgr); | |
2861 | *handled = true; | |
2862 | } | |
2863 | ||
2864 | drm_dp_mst_kick_tx(mgr); | |
2865 | return ret; | |
2866 | } | |
2867 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); | |
2868 | ||
2869 | /** | |
2870 | * drm_dp_mst_detect_port() - get connection status for an MST port | |
132d49d7 | 2871 | * @connector: DRM connector for this port |
ad7f8a1f DA |
2872 | * @mgr: manager for this port |
2873 | * @port: unverified pointer to a port | |
2874 | * | |
2875 | * This returns the current connection state for a port. It validates the | |
2876 | * port pointer still exists so the caller doesn't require a reference | |
2877 | */ | |
c6a0aed4 DA |
2878 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
2879 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
ad7f8a1f DA |
2880 | { |
2881 | enum drm_connector_status status = connector_status_disconnected; | |
2882 | ||
2883 | /* we need to search for the port in the mgr in case its gone */ | |
d0757afd | 2884 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
2885 | if (!port) |
2886 | return connector_status_disconnected; | |
2887 | ||
2888 | if (!port->ddps) | |
2889 | goto out; | |
2890 | ||
2891 | switch (port->pdt) { | |
2892 | case DP_PEER_DEVICE_NONE: | |
2893 | case DP_PEER_DEVICE_MST_BRANCHING: | |
2894 | break; | |
2895 | ||
2896 | case DP_PEER_DEVICE_SST_SINK: | |
2897 | status = connector_status_connected; | |
8ae22cb4 DA |
2898 | /* for logical ports - cache the EDID */ |
2899 | if (port->port_num >= 8 && !port->cached_edid) { | |
2900 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); | |
2901 | } | |
ad7f8a1f DA |
2902 | break; |
2903 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
2904 | if (port->ldps) | |
2905 | status = connector_status_connected; | |
2906 | break; | |
2907 | } | |
2908 | out: | |
d0757afd | 2909 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
2910 | return status; |
2911 | } | |
2912 | EXPORT_SYMBOL(drm_dp_mst_detect_port); | |
2913 | ||
ef8f9bea LY |
2914 | /** |
2915 | * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not | |
2916 | * @mgr: manager for this port | |
2917 | * @port: unverified pointer to a port. | |
2918 | * | |
2919 | * This returns whether the port supports audio or not. | |
2920 | */ | |
2921 | bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, | |
2922 | struct drm_dp_mst_port *port) | |
2923 | { | |
2924 | bool ret = false; | |
2925 | ||
d0757afd | 2926 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ef8f9bea LY |
2927 | if (!port) |
2928 | return ret; | |
2929 | ret = port->has_audio; | |
d0757afd | 2930 | drm_dp_mst_topology_put_port(port); |
ef8f9bea LY |
2931 | return ret; |
2932 | } | |
2933 | EXPORT_SYMBOL(drm_dp_mst_port_has_audio); | |
2934 | ||
ad7f8a1f DA |
2935 | /** |
2936 | * drm_dp_mst_get_edid() - get EDID for an MST port | |
2937 | * @connector: toplevel connector to get EDID for | |
2938 | * @mgr: manager for this port | |
2939 | * @port: unverified pointer to a port. | |
2940 | * | |
2941 | * This returns an EDID for the port connected to a connector, | |
2942 | * It validates the pointer still exists so the caller doesn't require a | |
2943 | * reference. | |
2944 | */ | |
2945 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2946 | { | |
2947 | struct edid *edid = NULL; | |
2948 | ||
2949 | /* we need to search for the port in the mgr in case its gone */ | |
d0757afd | 2950 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
2951 | if (!port) |
2952 | return NULL; | |
2953 | ||
c6a0aed4 DA |
2954 | if (port->cached_edid) |
2955 | edid = drm_edid_duplicate(port->cached_edid); | |
8ae22cb4 DA |
2956 | else { |
2957 | edid = drm_get_edid(connector, &port->aux.ddc); | |
97e14fbe | 2958 | drm_connector_set_tile_property(connector); |
8ae22cb4 | 2959 | } |
ef8f9bea | 2960 | port->has_audio = drm_detect_monitor_audio(edid); |
d0757afd | 2961 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
2962 | return edid; |
2963 | } | |
2964 | EXPORT_SYMBOL(drm_dp_mst_get_edid); | |
2965 | ||
2966 | /** | |
e4b0c868 | 2967 | * drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value |
ad7f8a1f DA |
2968 | * @mgr: manager to use |
2969 | * @pbn: payload bandwidth to convert into slots. | |
e4b0c868 LP |
2970 | * |
2971 | * Calculate the number of VCPI slots that will be required for the given PBN | |
2972 | * value. This function is deprecated, and should not be used in atomic | |
2973 | * drivers. | |
2974 | * | |
2975 | * RETURNS: | |
2976 | * The total slots required for this port, or error. | |
ad7f8a1f DA |
2977 | */ |
2978 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, | |
2979 | int pbn) | |
2980 | { | |
2981 | int num_slots; | |
2982 | ||
2983 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2984 | ||
feb2c3bc PD |
2985 | /* max. time slots - one slot for MTP header */ |
2986 | if (num_slots > 63) | |
ad7f8a1f DA |
2987 | return -ENOSPC; |
2988 | return num_slots; | |
2989 | } | |
2990 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); | |
2991 | ||
2992 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, | |
1e797f55 | 2993 | struct drm_dp_vcpi *vcpi, int pbn, int slots) |
ad7f8a1f | 2994 | { |
ad7f8a1f DA |
2995 | int ret; |
2996 | ||
feb2c3bc | 2997 | /* max. time slots - one slot for MTP header */ |
1e797f55 | 2998 | if (slots > 63) |
ad7f8a1f DA |
2999 | return -ENOSPC; |
3000 | ||
3001 | vcpi->pbn = pbn; | |
1e797f55 PD |
3002 | vcpi->aligned_pbn = slots * mgr->pbn_div; |
3003 | vcpi->num_slots = slots; | |
ad7f8a1f DA |
3004 | |
3005 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); | |
3006 | if (ret < 0) | |
3007 | return ret; | |
3008 | return 0; | |
3009 | } | |
3010 | ||
edb1ed1a PD |
3011 | /** |
3012 | * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state | |
3013 | * @state: global atomic state | |
3014 | * @mgr: MST topology manager for the port | |
3015 | * @port: port to find vcpi slots for | |
3016 | * @pbn: bandwidth required for the mode in PBN | |
3017 | * | |
3018 | * RETURNS: | |
3019 | * Total slots in the atomic state assigned for this port or error | |
3020 | */ | |
3021 | int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, | |
3022 | struct drm_dp_mst_topology_mgr *mgr, | |
3023 | struct drm_dp_mst_port *port, int pbn) | |
3024 | { | |
3025 | struct drm_dp_mst_topology_state *topology_state; | |
3026 | int req_slots; | |
3027 | ||
3028 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
3029 | if (IS_ERR(topology_state)) |
3030 | return PTR_ERR(topology_state); | |
edb1ed1a | 3031 | |
d0757afd | 3032 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
edb1ed1a PD |
3033 | if (port == NULL) |
3034 | return -EINVAL; | |
3035 | req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
3036 | DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n", | |
3037 | req_slots, topology_state->avail_slots); | |
3038 | ||
3039 | if (req_slots > topology_state->avail_slots) { | |
d0757afd | 3040 | drm_dp_mst_topology_put_port(port); |
edb1ed1a PD |
3041 | return -ENOSPC; |
3042 | } | |
3043 | ||
3044 | topology_state->avail_slots -= req_slots; | |
3045 | DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots); | |
3046 | ||
d0757afd | 3047 | drm_dp_mst_topology_put_port(port); |
edb1ed1a PD |
3048 | return req_slots; |
3049 | } | |
3050 | EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); | |
3051 | ||
3052 | /** | |
3053 | * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots | |
3054 | * @state: global atomic state | |
3055 | * @mgr: MST topology manager for the port | |
3056 | * @slots: number of vcpi slots to release | |
3057 | * | |
3058 | * RETURNS: | |
3059 | * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or | |
3060 | * negative error code | |
3061 | */ | |
3062 | int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, | |
3063 | struct drm_dp_mst_topology_mgr *mgr, | |
3064 | int slots) | |
3065 | { | |
3066 | struct drm_dp_mst_topology_state *topology_state; | |
3067 | ||
3068 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); | |
56a91c49 VS |
3069 | if (IS_ERR(topology_state)) |
3070 | return PTR_ERR(topology_state); | |
edb1ed1a PD |
3071 | |
3072 | /* We cannot rely on port->vcpi.num_slots to update | |
3073 | * topology_state->avail_slots as the port may not exist if the parent | |
3074 | * branch device was unplugged. This should be fixed by tracking | |
3075 | * per-port slot allocation in drm_dp_mst_topology_state instead of | |
3076 | * depending on the caller to tell us how many slots to release. | |
3077 | */ | |
3078 | topology_state->avail_slots += slots; | |
3079 | DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n", | |
3080 | slots, topology_state->avail_slots); | |
3081 | ||
3082 | return 0; | |
3083 | } | |
3084 | EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); | |
3085 | ||
ad7f8a1f DA |
3086 | /** |
3087 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel | |
3088 | * @mgr: manager for this port | |
3089 | * @port: port to allocate a virtual channel for. | |
3090 | * @pbn: payload bandwidth number to request | |
3091 | * @slots: returned number of slots for this PBN. | |
3092 | */ | |
1e797f55 PD |
3093 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
3094 | struct drm_dp_mst_port *port, int pbn, int slots) | |
ad7f8a1f DA |
3095 | { |
3096 | int ret; | |
3097 | ||
d0757afd | 3098 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
3099 | if (!port) |
3100 | return false; | |
3101 | ||
1e797f55 PD |
3102 | if (slots < 0) |
3103 | return false; | |
3104 | ||
ad7f8a1f | 3105 | if (port->vcpi.vcpi > 0) { |
e0ac7113 LP |
3106 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", |
3107 | port->vcpi.vcpi, port->vcpi.pbn, pbn); | |
ad7f8a1f | 3108 | if (pbn == port->vcpi.pbn) { |
d0757afd | 3109 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
3110 | return true; |
3111 | } | |
3112 | } | |
3113 | ||
1e797f55 | 3114 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); |
ad7f8a1f | 3115 | if (ret) { |
feb2c3bc | 3116 | DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n", |
e0ac7113 | 3117 | DIV_ROUND_UP(pbn, mgr->pbn_div), ret); |
ad7f8a1f DA |
3118 | goto out; |
3119 | } | |
feb2c3bc | 3120 | DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n", |
e0ac7113 | 3121 | pbn, port->vcpi.num_slots); |
ad7f8a1f | 3122 | |
d0757afd | 3123 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
3124 | return true; |
3125 | out: | |
3126 | return false; | |
3127 | } | |
3128 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); | |
3129 | ||
87f5942d DA |
3130 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
3131 | { | |
3132 | int slots = 0; | |
d0757afd | 3133 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
87f5942d DA |
3134 | if (!port) |
3135 | return slots; | |
3136 | ||
3137 | slots = port->vcpi.num_slots; | |
d0757afd | 3138 | drm_dp_mst_topology_put_port(port); |
87f5942d DA |
3139 | return slots; |
3140 | } | |
3141 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); | |
3142 | ||
ad7f8a1f DA |
3143 | /** |
3144 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI | |
3145 | * @mgr: manager for this port | |
3146 | * @port: unverified pointer to a port. | |
3147 | * | |
3148 | * This just resets the number of slots for the ports VCPI for later programming. | |
3149 | */ | |
3150 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
3151 | { | |
d0757afd | 3152 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
3153 | if (!port) |
3154 | return; | |
3155 | port->vcpi.num_slots = 0; | |
d0757afd | 3156 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
3157 | } |
3158 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); | |
3159 | ||
3160 | /** | |
3161 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI | |
3162 | * @mgr: manager for this port | |
3163 | * @port: unverified port to deallocate vcpi for | |
3164 | */ | |
4afb8a26 LP |
3165 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
3166 | struct drm_dp_mst_port *port) | |
ad7f8a1f | 3167 | { |
d0757afd | 3168 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
ad7f8a1f DA |
3169 | if (!port) |
3170 | return; | |
3171 | ||
3172 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
3173 | port->vcpi.num_slots = 0; | |
3174 | port->vcpi.pbn = 0; | |
3175 | port->vcpi.aligned_pbn = 0; | |
3176 | port->vcpi.vcpi = 0; | |
d0757afd | 3177 | drm_dp_mst_topology_put_port(port); |
ad7f8a1f DA |
3178 | } |
3179 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); | |
3180 | ||
3181 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
3182 | int id, struct drm_dp_payload *payload) | |
3183 | { | |
3184 | u8 payload_alloc[3], status; | |
3185 | int ret; | |
3186 | int retries = 0; | |
3187 | ||
3188 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, | |
3189 | DP_PAYLOAD_TABLE_UPDATED); | |
3190 | ||
3191 | payload_alloc[0] = id; | |
3192 | payload_alloc[1] = payload->start_slot; | |
3193 | payload_alloc[2] = payload->num_slots; | |
3194 | ||
3195 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); | |
3196 | if (ret != 3) { | |
3197 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); | |
3198 | goto fail; | |
3199 | } | |
3200 | ||
3201 | retry: | |
3202 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
3203 | if (ret < 0) { | |
3204 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
3205 | goto fail; | |
3206 | } | |
3207 | ||
3208 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { | |
3209 | retries++; | |
3210 | if (retries < 20) { | |
3211 | usleep_range(10000, 20000); | |
3212 | goto retry; | |
3213 | } | |
3214 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); | |
3215 | ret = -EINVAL; | |
3216 | goto fail; | |
3217 | } | |
3218 | ret = 0; | |
3219 | fail: | |
3220 | return ret; | |
3221 | } | |
3222 | ||
3223 | ||
3224 | /** | |
3225 | * drm_dp_check_act_status() - Check ACT handled status. | |
3226 | * @mgr: manager to use | |
3227 | * | |
3228 | * Check the payload status bits in the DPCD for ACT handled completion. | |
3229 | */ | |
3230 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) | |
3231 | { | |
3232 | u8 status; | |
3233 | int ret; | |
3234 | int count = 0; | |
3235 | ||
3236 | do { | |
3237 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
3238 | ||
3239 | if (ret < 0) { | |
3240 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
3241 | goto fail; | |
3242 | } | |
3243 | ||
3244 | if (status & DP_PAYLOAD_ACT_HANDLED) | |
3245 | break; | |
3246 | count++; | |
3247 | udelay(100); | |
3248 | ||
3249 | } while (count < 30); | |
3250 | ||
3251 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { | |
3252 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); | |
3253 | ret = -EINVAL; | |
3254 | goto fail; | |
3255 | } | |
3256 | return 0; | |
3257 | fail: | |
3258 | return ret; | |
3259 | } | |
3260 | EXPORT_SYMBOL(drm_dp_check_act_status); | |
3261 | ||
3262 | /** | |
3263 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. | |
3264 | * @clock: dot clock for the mode | |
3265 | * @bpp: bpp for the mode. | |
3266 | * | |
3267 | * This uses the formula in the spec to calculate the PBN value for a mode. | |
3268 | */ | |
3269 | int drm_dp_calc_pbn_mode(int clock, int bpp) | |
3270 | { | |
a9ebb3e4 HW |
3271 | u64 kbps; |
3272 | s64 peak_kbps; | |
3273 | u32 numerator; | |
3274 | u32 denominator; | |
3275 | ||
3276 | kbps = clock * bpp; | |
3277 | ||
3278 | /* | |
3279 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 | |
3280 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on | |
3281 | * common multiplier to render an integer PBN for all link rate/lane | |
3282 | * counts combinations | |
3283 | * calculate | |
3284 | * peak_kbps *= (1006/1000) | |
3285 | * peak_kbps *= (64/54) | |
3286 | * peak_kbps *= 8 convert to bytes | |
3287 | */ | |
3288 | ||
3289 | numerator = 64 * 1006; | |
3290 | denominator = 54 * 8 * 1000 * 1000; | |
3291 | ||
3292 | kbps *= numerator; | |
3293 | peak_kbps = drm_fixp_from_fraction(kbps, denominator); | |
3294 | ||
3295 | return drm_fixp2int_ceil(peak_kbps); | |
ad7f8a1f DA |
3296 | } |
3297 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); | |
3298 | ||
3299 | static int test_calc_pbn_mode(void) | |
3300 | { | |
3301 | int ret; | |
3302 | ret = drm_dp_calc_pbn_mode(154000, 30); | |
a9ebb3e4 HW |
3303 | if (ret != 689) { |
3304 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
3305 | 154000, 30, 689, ret); | |
ad7f8a1f | 3306 | return -EINVAL; |
a9ebb3e4 | 3307 | } |
ad7f8a1f | 3308 | ret = drm_dp_calc_pbn_mode(234000, 30); |
a9ebb3e4 HW |
3309 | if (ret != 1047) { |
3310 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
3311 | 234000, 30, 1047, ret); | |
ad7f8a1f | 3312 | return -EINVAL; |
a9ebb3e4 HW |
3313 | } |
3314 | ret = drm_dp_calc_pbn_mode(297000, 24); | |
3315 | if (ret != 1063) { | |
3316 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
3317 | 297000, 24, 1063, ret); | |
3318 | return -EINVAL; | |
3319 | } | |
ad7f8a1f DA |
3320 | return 0; |
3321 | } | |
3322 | ||
3323 | /* we want to kick the TX after we've ack the up/down IRQs. */ | |
3324 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) | |
3325 | { | |
3326 | queue_work(system_long_wq, &mgr->tx_work); | |
3327 | } | |
3328 | ||
3329 | static void drm_dp_mst_dump_mstb(struct seq_file *m, | |
3330 | struct drm_dp_mst_branch *mstb) | |
3331 | { | |
3332 | struct drm_dp_mst_port *port; | |
3333 | int tabs = mstb->lct; | |
3334 | char prefix[10]; | |
3335 | int i; | |
3336 | ||
3337 | for (i = 0; i < tabs; i++) | |
3338 | prefix[i] = '\t'; | |
3339 | prefix[i] = '\0'; | |
3340 | ||
3341 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); | |
3342 | list_for_each_entry(port, &mstb->ports, next) { | |
51108f25 | 3343 | seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); |
ad7f8a1f DA |
3344 | if (port->mstb) |
3345 | drm_dp_mst_dump_mstb(m, port->mstb); | |
3346 | } | |
3347 | } | |
3348 | ||
7056a2bc AS |
3349 | #define DP_PAYLOAD_TABLE_SIZE 64 |
3350 | ||
ad7f8a1f DA |
3351 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
3352 | char *buf) | |
3353 | { | |
ad7f8a1f | 3354 | int i; |
46466b0d | 3355 | |
7056a2bc | 3356 | for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) { |
46466b0d JP |
3357 | if (drm_dp_dpcd_read(mgr->aux, |
3358 | DP_PAYLOAD_TABLE_UPDATE_STATUS + i, | |
3359 | &buf[i], 16) != 16) | |
3360 | return false; | |
ad7f8a1f | 3361 | } |
46466b0d | 3362 | return true; |
ad7f8a1f DA |
3363 | } |
3364 | ||
51108f25 JB |
3365 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
3366 | struct drm_dp_mst_port *port, char *name, | |
3367 | int namelen) | |
3368 | { | |
3369 | struct edid *mst_edid; | |
3370 | ||
3371 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); | |
3372 | drm_edid_get_monitor_name(mst_edid, name, namelen); | |
3373 | } | |
3374 | ||
ad7f8a1f DA |
3375 | /** |
3376 | * drm_dp_mst_dump_topology(): dump topology to seq file. | |
3377 | * @m: seq_file to dump output to | |
3378 | * @mgr: manager to dump current topology for. | |
3379 | * | |
3380 | * helper to dump MST topology to a seq file for debugfs. | |
3381 | */ | |
3382 | void drm_dp_mst_dump_topology(struct seq_file *m, | |
3383 | struct drm_dp_mst_topology_mgr *mgr) | |
3384 | { | |
3385 | int i; | |
3386 | struct drm_dp_mst_port *port; | |
51108f25 | 3387 | |
ad7f8a1f DA |
3388 | mutex_lock(&mgr->lock); |
3389 | if (mgr->mst_primary) | |
3390 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); | |
3391 | ||
3392 | /* dump VCPIs */ | |
3393 | mutex_unlock(&mgr->lock); | |
3394 | ||
3395 | mutex_lock(&mgr->payload_lock); | |
51108f25 JB |
3396 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
3397 | mgr->max_payloads); | |
ad7f8a1f DA |
3398 | |
3399 | for (i = 0; i < mgr->max_payloads; i++) { | |
3400 | if (mgr->proposed_vcpis[i]) { | |
51108f25 JB |
3401 | char name[14]; |
3402 | ||
ad7f8a1f | 3403 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
51108f25 JB |
3404 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
3405 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, | |
3406 | port->port_num, port->vcpi.vcpi, | |
3407 | port->vcpi.num_slots, | |
3408 | (*name != 0) ? name : "Unknown"); | |
ad7f8a1f | 3409 | } else |
51108f25 | 3410 | seq_printf(m, "vcpi %d:unused\n", i); |
ad7f8a1f DA |
3411 | } |
3412 | for (i = 0; i < mgr->max_payloads; i++) { | |
3413 | seq_printf(m, "payload %d: %d, %d, %d\n", | |
3414 | i, | |
3415 | mgr->payloads[i].payload_state, | |
3416 | mgr->payloads[i].start_slot, | |
3417 | mgr->payloads[i].num_slots); | |
3418 | ||
3419 | ||
3420 | } | |
3421 | mutex_unlock(&mgr->payload_lock); | |
3422 | ||
3423 | mutex_lock(&mgr->lock); | |
3424 | if (mgr->mst_primary) { | |
7056a2bc | 3425 | u8 buf[DP_PAYLOAD_TABLE_SIZE]; |
ad7f8a1f | 3426 | int ret; |
46466b0d | 3427 | |
ad7f8a1f | 3428 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); |
46466b0d | 3429 | seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); |
ad7f8a1f | 3430 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); |
46466b0d | 3431 | seq_printf(m, "faux/mst: %*ph\n", 2, buf); |
ad7f8a1f | 3432 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); |
46466b0d | 3433 | seq_printf(m, "mst ctrl: %*ph\n", 1, buf); |
ad7f8a1f | 3434 | |
44790462 DA |
3435 | /* dump the standard OUI branch header */ |
3436 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); | |
46466b0d | 3437 | seq_printf(m, "branch oui: %*phN devid: ", 3, buf); |
51108f25 | 3438 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
44790462 | 3439 | seq_printf(m, "%c", buf[i]); |
46466b0d JP |
3440 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", |
3441 | buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); | |
3442 | if (dump_dp_payload_table(mgr, buf)) | |
7056a2bc | 3443 | seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf); |
ad7f8a1f DA |
3444 | } |
3445 | ||
3446 | mutex_unlock(&mgr->lock); | |
3447 | ||
3448 | } | |
3449 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); | |
3450 | ||
3451 | static void drm_dp_tx_work(struct work_struct *work) | |
3452 | { | |
3453 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); | |
3454 | ||
3455 | mutex_lock(&mgr->qlock); | |
cb021a3e | 3456 | if (!list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
3457 | process_single_down_tx_qlock(mgr); |
3458 | mutex_unlock(&mgr->qlock); | |
3459 | } | |
3460 | ||
6b8eeca6 DA |
3461 | static void drm_dp_destroy_connector_work(struct work_struct *work) |
3462 | { | |
3463 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); | |
4772ff03 | 3464 | struct drm_dp_mst_port *port; |
df4839fd | 3465 | bool send_hotplug = false; |
6b8eeca6 DA |
3466 | /* |
3467 | * Not a regular list traverse as we have to drop the destroy | |
3468 | * connector lock before destroying the connector, to avoid AB->BA | |
3469 | * ordering between this lock and the config mutex. | |
3470 | */ | |
3471 | for (;;) { | |
3472 | mutex_lock(&mgr->destroy_connector_lock); | |
4772ff03 ML |
3473 | port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); |
3474 | if (!port) { | |
6b8eeca6 DA |
3475 | mutex_unlock(&mgr->destroy_connector_lock); |
3476 | break; | |
3477 | } | |
4772ff03 | 3478 | list_del(&port->next); |
6b8eeca6 DA |
3479 | mutex_unlock(&mgr->destroy_connector_lock); |
3480 | ||
91a25e46 ML |
3481 | INIT_LIST_HEAD(&port->next); |
3482 | ||
4772ff03 ML |
3483 | mgr->cbs->destroy_connector(mgr, port->connector); |
3484 | ||
3485 | drm_dp_port_teardown_pdt(port, port->pdt); | |
36e3fa6a | 3486 | port->pdt = DP_PEER_DEVICE_NONE; |
4772ff03 | 3487 | |
ebcc0e6b | 3488 | drm_dp_mst_put_port_malloc(port); |
df4839fd | 3489 | send_hotplug = true; |
6b8eeca6 | 3490 | } |
df4839fd | 3491 | if (send_hotplug) |
16bff572 | 3492 | drm_kms_helper_hotplug_event(mgr->dev); |
6b8eeca6 DA |
3493 | } |
3494 | ||
a4370c77 VS |
3495 | static struct drm_private_state * |
3496 | drm_dp_mst_duplicate_state(struct drm_private_obj *obj) | |
3f3353b7 | 3497 | { |
a4370c77 | 3498 | struct drm_dp_mst_topology_state *state; |
3f3353b7 | 3499 | |
a4370c77 VS |
3500 | state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); |
3501 | if (!state) | |
3f3353b7 PD |
3502 | return NULL; |
3503 | ||
a4370c77 | 3504 | __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); |
3f3353b7 | 3505 | |
a4370c77 | 3506 | return &state->base; |
3f3353b7 PD |
3507 | } |
3508 | ||
a4370c77 VS |
3509 | static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, |
3510 | struct drm_private_state *state) | |
3f3353b7 | 3511 | { |
a4370c77 VS |
3512 | struct drm_dp_mst_topology_state *mst_state = |
3513 | to_dp_mst_topology_state(state); | |
3514 | ||
3515 | kfree(mst_state); | |
3f3353b7 PD |
3516 | } |
3517 | ||
3518 | static const struct drm_private_state_funcs mst_state_funcs = { | |
a4370c77 VS |
3519 | .atomic_duplicate_state = drm_dp_mst_duplicate_state, |
3520 | .atomic_destroy_state = drm_dp_mst_destroy_state, | |
3f3353b7 PD |
3521 | }; |
3522 | ||
3523 | /** | |
3524 | * drm_atomic_get_mst_topology_state: get MST topology state | |
3525 | * | |
3526 | * @state: global atomic state | |
3527 | * @mgr: MST topology manager, also the private object in this case | |
3528 | * | |
3529 | * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic | |
3530 | * state vtable so that the private object state returned is that of a MST | |
3531 | * topology object. Also, drm_atomic_get_private_obj_state() expects the caller | |
3532 | * to care of the locking, so warn if don't hold the connection_mutex. | |
3533 | * | |
3534 | * RETURNS: | |
3535 | * | |
3536 | * The MST topology state or error pointer. | |
3537 | */ | |
3538 | struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, | |
3539 | struct drm_dp_mst_topology_mgr *mgr) | |
3540 | { | |
3541 | struct drm_device *dev = mgr->dev; | |
3542 | ||
3543 | WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); | |
a4370c77 | 3544 | return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base)); |
3f3353b7 PD |
3545 | } |
3546 | EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); | |
3547 | ||
ad7f8a1f DA |
3548 | /** |
3549 | * drm_dp_mst_topology_mgr_init - initialise a topology manager | |
3550 | * @mgr: manager struct to initialise | |
3551 | * @dev: device providing this structure - for i2c addition. | |
3552 | * @aux: DP helper aux channel to talk to this device | |
3553 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit | |
3554 | * @max_payloads: maximum number of payloads this GPU can source | |
3555 | * @conn_base_id: the connector object ID the MST device is connected to. | |
3556 | * | |
3557 | * Return 0 for success, or negative error code on failure | |
3558 | */ | |
3559 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, | |
7b0a89a6 | 3560 | struct drm_device *dev, struct drm_dp_aux *aux, |
ad7f8a1f DA |
3561 | int max_dpcd_transaction_bytes, |
3562 | int max_payloads, int conn_base_id) | |
3563 | { | |
a4370c77 VS |
3564 | struct drm_dp_mst_topology_state *mst_state; |
3565 | ||
ad7f8a1f DA |
3566 | mutex_init(&mgr->lock); |
3567 | mutex_init(&mgr->qlock); | |
3568 | mutex_init(&mgr->payload_lock); | |
6b8eeca6 | 3569 | mutex_init(&mgr->destroy_connector_lock); |
ad7f8a1f | 3570 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
6b8eeca6 | 3571 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
ad7f8a1f DA |
3572 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
3573 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); | |
6b8eeca6 | 3574 | INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); |
ad7f8a1f DA |
3575 | init_waitqueue_head(&mgr->tx_waitq); |
3576 | mgr->dev = dev; | |
3577 | mgr->aux = aux; | |
3578 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; | |
3579 | mgr->max_payloads = max_payloads; | |
3580 | mgr->conn_base_id = conn_base_id; | |
4d6a10da ID |
3581 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
3582 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) | |
3583 | return -EINVAL; | |
ad7f8a1f DA |
3584 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
3585 | if (!mgr->payloads) | |
3586 | return -ENOMEM; | |
3587 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); | |
3588 | if (!mgr->proposed_vcpis) | |
3589 | return -ENOMEM; | |
3590 | set_bit(0, &mgr->payload_mask); | |
441388a8 ID |
3591 | if (test_calc_pbn_mode() < 0) |
3592 | DRM_ERROR("MST PBN self-test failed\n"); | |
3593 | ||
a4370c77 VS |
3594 | mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL); |
3595 | if (mst_state == NULL) | |
3f3353b7 | 3596 | return -ENOMEM; |
a4370c77 VS |
3597 | |
3598 | mst_state->mgr = mgr; | |
3f3353b7 PD |
3599 | |
3600 | /* max. time slots - one slot for MTP header */ | |
a4370c77 VS |
3601 | mst_state->avail_slots = 63; |
3602 | ||
b962a120 | 3603 | drm_atomic_private_obj_init(dev, &mgr->base, |
a4370c77 VS |
3604 | &mst_state->base, |
3605 | &mst_state_funcs); | |
3f3353b7 | 3606 | |
ad7f8a1f DA |
3607 | return 0; |
3608 | } | |
3609 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); | |
3610 | ||
3611 | /** | |
3612 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. | |
3613 | * @mgr: manager to destroy | |
3614 | */ | |
3615 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) | |
3616 | { | |
f536e00c | 3617 | drm_dp_mst_topology_mgr_set_mst(mgr, false); |
274d8352 | 3618 | flush_work(&mgr->work); |
6b8eeca6 | 3619 | flush_work(&mgr->destroy_connector_work); |
ad7f8a1f DA |
3620 | mutex_lock(&mgr->payload_lock); |
3621 | kfree(mgr->payloads); | |
3622 | mgr->payloads = NULL; | |
3623 | kfree(mgr->proposed_vcpis); | |
3624 | mgr->proposed_vcpis = NULL; | |
3625 | mutex_unlock(&mgr->payload_lock); | |
3626 | mgr->dev = NULL; | |
3627 | mgr->aux = NULL; | |
a4370c77 | 3628 | drm_atomic_private_obj_fini(&mgr->base); |
3f3353b7 | 3629 | mgr->funcs = NULL; |
ad7f8a1f DA |
3630 | } |
3631 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); | |
3632 | ||
cb8ce711 VS |
3633 | static bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num) |
3634 | { | |
3635 | int i; | |
3636 | ||
3637 | if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS) | |
3638 | return false; | |
3639 | ||
3640 | for (i = 0; i < num - 1; i++) { | |
3641 | if (msgs[i].flags & I2C_M_RD || | |
3642 | msgs[i].len > 0xff) | |
3643 | return false; | |
3644 | } | |
3645 | ||
3646 | return msgs[num - 1].flags & I2C_M_RD && | |
3647 | msgs[num - 1].len <= 0xff; | |
3648 | } | |
3649 | ||
ad7f8a1f DA |
3650 | /* I2C device */ |
3651 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, | |
3652 | int num) | |
3653 | { | |
3654 | struct drm_dp_aux *aux = adapter->algo_data; | |
3655 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); | |
3656 | struct drm_dp_mst_branch *mstb; | |
3657 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
3658 | unsigned int i; | |
ad7f8a1f DA |
3659 | struct drm_dp_sideband_msg_req_body msg; |
3660 | struct drm_dp_sideband_msg_tx *txmsg = NULL; | |
3661 | int ret; | |
3662 | ||
d0757afd | 3663 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
ad7f8a1f DA |
3664 | if (!mstb) |
3665 | return -EREMOTEIO; | |
3666 | ||
cb8ce711 | 3667 | if (!remote_i2c_read_ok(msgs, num)) { |
ad7f8a1f DA |
3668 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
3669 | ret = -EIO; | |
3670 | goto out; | |
3671 | } | |
3672 | ||
ae491542 | 3673 | memset(&msg, 0, sizeof(msg)); |
ad7f8a1f DA |
3674 | msg.req_type = DP_REMOTE_I2C_READ; |
3675 | msg.u.i2c_read.num_transactions = num - 1; | |
3676 | msg.u.i2c_read.port_number = port->port_num; | |
3677 | for (i = 0; i < num - 1; i++) { | |
3678 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; | |
3679 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; | |
3680 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; | |
c978ae9b | 3681 | msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP); |
ad7f8a1f DA |
3682 | } |
3683 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; | |
3684 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; | |
3685 | ||
3686 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3687 | if (!txmsg) { | |
3688 | ret = -ENOMEM; | |
3689 | goto out; | |
3690 | } | |
3691 | ||
3692 | txmsg->dst = mstb; | |
3693 | drm_dp_encode_sideband_req(&msg, txmsg); | |
3694 | ||
3695 | drm_dp_queue_down_tx(mgr, txmsg); | |
3696 | ||
3697 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
3698 | if (ret > 0) { | |
3699 | ||
3700 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ | |
3701 | ret = -EREMOTEIO; | |
3702 | goto out; | |
3703 | } | |
3704 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { | |
3705 | ret = -EIO; | |
3706 | goto out; | |
3707 | } | |
3708 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); | |
3709 | ret = num; | |
3710 | } | |
3711 | out: | |
3712 | kfree(txmsg); | |
d0757afd | 3713 | drm_dp_mst_topology_put_mstb(mstb); |
ad7f8a1f DA |
3714 | return ret; |
3715 | } | |
3716 | ||
3717 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) | |
3718 | { | |
3719 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
3720 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
3721 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | | |
3722 | I2C_FUNC_10BIT_ADDR; | |
3723 | } | |
3724 | ||
3725 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { | |
3726 | .functionality = drm_dp_mst_i2c_functionality, | |
3727 | .master_xfer = drm_dp_mst_i2c_xfer, | |
3728 | }; | |
3729 | ||
3730 | /** | |
3731 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX | |
3732 | * @aux: DisplayPort AUX channel | |
3733 | * | |
3734 | * Returns 0 on success or a negative error code on failure. | |
3735 | */ | |
3736 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) | |
3737 | { | |
3738 | aux->ddc.algo = &drm_dp_mst_i2c_algo; | |
3739 | aux->ddc.algo_data = aux; | |
3740 | aux->ddc.retries = 3; | |
3741 | ||
3742 | aux->ddc.class = I2C_CLASS_DDC; | |
3743 | aux->ddc.owner = THIS_MODULE; | |
3744 | aux->ddc.dev.parent = aux->dev; | |
3745 | aux->ddc.dev.of_node = aux->dev->of_node; | |
3746 | ||
3747 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), | |
3748 | sizeof(aux->ddc.name)); | |
3749 | ||
3750 | return i2c_add_adapter(&aux->ddc); | |
3751 | } | |
3752 | ||
3753 | /** | |
3754 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter | |
3755 | * @aux: DisplayPort AUX channel | |
3756 | */ | |
3757 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) | |
3758 | { | |
3759 | i2c_del_adapter(&aux->ddc); | |
3760 | } |