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drm/doc: move printf helpers out of drmP.h
[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / drm_dp_mst_topology.c
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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>
34
35/**
36 * DOC: dp mst helper
37 *
38 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
39 * protocol. The helpers contain a topology manager and bandwidth manager.
40 * The helpers encapsulate the sending and received of sideband msgs.
41 */
42static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
43 char *buf);
44static int test_calc_pbn_mode(void);
45
46static void drm_dp_put_port(struct drm_dp_mst_port *port);
47
48static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
49 int id,
50 struct drm_dp_payload *payload);
51
52static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
53 struct drm_dp_mst_port *port,
54 int offset, int size, u8 *bytes);
55
68d8c9fc
DA		 56static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
57 struct drm_dp_mst_branch *mstb);
ad7f8a1f
DA		 58static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
59 struct drm_dp_mst_branch *mstb,
60 struct drm_dp_mst_port *port);
61static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
62 u8 *guid);
63
64static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
65static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
66static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
67/* sideband msg handling */
68static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
69{
70 u8 bitmask = 0x80;
71 u8 bitshift = 7;
72 u8 array_index = 0;
73 int number_of_bits = num_nibbles * 4;
74 u8 remainder = 0;
75
76 while (number_of_bits != 0) {
77 number_of_bits--;
78 remainder <<= 1;
79 remainder |= (data[array_index] & bitmask) >> bitshift;
80 bitmask >>= 1;
81 bitshift--;
82 if (bitmask == 0) {
83 bitmask = 0x80;
84 bitshift = 7;
85 array_index++;
86 }
87 if ((remainder & 0x10) == 0x10)
88 remainder ^= 0x13;
89 }
90
91 number_of_bits = 4;
92 while (number_of_bits != 0) {
93 number_of_bits--;
94 remainder <<= 1;
95 if ((remainder & 0x10) != 0)
96 remainder ^= 0x13;
97 }
98
99 return remainder;
100}
101
102static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
103{
104 u8 bitmask = 0x80;
105 u8 bitshift = 7;
106 u8 array_index = 0;
107 int number_of_bits = number_of_bytes * 8;
108 u16 remainder = 0;
109
110 while (number_of_bits != 0) {
111 number_of_bits--;
112 remainder <<= 1;
113 remainder |= (data[array_index] & bitmask) >> bitshift;
114 bitmask >>= 1;
115 bitshift--;
116 if (bitmask == 0) {
117 bitmask = 0x80;
118 bitshift = 7;
119 array_index++;
120 }
121 if ((remainder & 0x100) == 0x100)
122 remainder ^= 0xd5;
123 }
124
125 number_of_bits = 8;
126 while (number_of_bits != 0) {
127 number_of_bits--;
128 remainder <<= 1;
129 if ((remainder & 0x100) != 0)
130 remainder ^= 0xd5;
131 }
132
133 return remainder & 0xff;
134}
135static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
136{
137 u8 size = 3;
138 size += (hdr->lct / 2);
139 return size;
140}
141
142static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
143 u8 *buf, int *len)
144{
145 int idx = 0;
146 int i;
147 u8 crc4;
148 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
149 for (i = 0; i < (hdr->lct / 2); i++)
150 buf[idx++] = hdr->rad[i];
151 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
152 (hdr->msg_len & 0x3f);
153 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
154
155 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
156 buf[idx - 1] |= (crc4 & 0xf);
157
158 *len = idx;
159}
160
161static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
162 u8 *buf, int buflen, u8 *hdrlen)
163{
164 u8 crc4;
165 u8 len;
166 int i;
167 u8 idx;
168 if (buf[0] == 0)
169 return false;
170 len = 3;
171 len += ((buf[0] & 0xf0) >> 4) / 2;
172 if (len > buflen)
173 return false;
174 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
175
176 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
177 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
178 return false;
179 }
180
181 hdr->lct = (buf[0] & 0xf0) >> 4;
182 hdr->lcr = (buf[0] & 0xf);
183 idx = 1;
184 for (i = 0; i < (hdr->lct / 2); i++)
185 hdr->rad[i] = buf[idx++];
186 hdr->broadcast = (buf[idx] >> 7) & 0x1;
187 hdr->path_msg = (buf[idx] >> 6) & 0x1;
188 hdr->msg_len = buf[idx] & 0x3f;
189 idx++;
190 hdr->somt = (buf[idx] >> 7) & 0x1;
191 hdr->eomt = (buf[idx] >> 6) & 0x1;
192 hdr->seqno = (buf[idx] >> 4) & 0x1;
193 idx++;
194 *hdrlen = idx;
195 return true;
196}
197
198static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
199 struct drm_dp_sideband_msg_tx *raw)
200{
201 int idx = 0;
202 int i;
203 u8 *buf = raw->msg;
204 buf[idx++] = req->req_type & 0x7f;
205
206 switch (req->req_type) {
207 case DP_ENUM_PATH_RESOURCES:
208 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
209 idx++;
210 break;
211 case DP_ALLOCATE_PAYLOAD:
212 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
213 (req->u.allocate_payload.number_sdp_streams & 0xf);
214 idx++;
215 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
216 idx++;
217 buf[idx] = (req->u.allocate_payload.pbn >> 8);
218 idx++;
219 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
220 idx++;
221 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
222 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
223 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
224 idx++;
225 }
226 if (req->u.allocate_payload.number_sdp_streams & 1) {
227 i = req->u.allocate_payload.number_sdp_streams - 1;
228 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
229 idx++;
230 }
231 break;
232 case DP_QUERY_PAYLOAD:
233 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
234 idx++;
235 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
236 idx++;
237 break;
238 case DP_REMOTE_DPCD_READ:
239 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
240 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
241 idx++;
242 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
243 idx++;
244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
245 idx++;
246 buf[idx] = (req->u.dpcd_read.num_bytes);
247 idx++;
248 break;
249
250 case DP_REMOTE_DPCD_WRITE:
251 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
252 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
253 idx++;
254 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
255 idx++;
256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
257 idx++;
258 buf[idx] = (req->u.dpcd_write.num_bytes);
259 idx++;
260 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
261 idx += req->u.dpcd_write.num_bytes;
262 break;
263 case DP_REMOTE_I2C_READ:
264 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
265 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
266 idx++;
267 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
268 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
269 idx++;
270 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
271 idx++;
272 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
273 idx += req->u.i2c_read.transactions[i].num_bytes;
274
275 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
276 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
277 idx++;
278 }
279 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
280 idx++;
281 buf[idx] = (req->u.i2c_read.num_bytes_read);
282 idx++;
283 break;
284
285 case DP_REMOTE_I2C_WRITE:
286 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
287 idx++;
288 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
289 idx++;
290 buf[idx] = (req->u.i2c_write.num_bytes);
291 idx++;
292 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
293 idx += req->u.i2c_write.num_bytes;
294 break;
295 }
296 raw->cur_len = idx;
297}
298
299static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
300{
301 u8 crc4;
302 crc4 = drm_dp_msg_data_crc4(msg, len);
303 msg[len] = crc4;
304}
305
306static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
307 struct drm_dp_sideband_msg_tx *raw)
308{
309 int idx = 0;
310 u8 *buf = raw->msg;
311
312 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
313
314 raw->cur_len = idx;
315}
316
317/* this adds a chunk of msg to the builder to get the final msg */
318static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
319 u8 *replybuf, u8 replybuflen, bool hdr)
320{
321 int ret;
322 u8 crc4;
323
324 if (hdr) {
325 u8 hdrlen;
326 struct drm_dp_sideband_msg_hdr recv_hdr;
327 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
328 if (ret == false) {
329 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
330 return false;
331 }
332
333 /* get length contained in this portion */
334 msg->curchunk_len = recv_hdr.msg_len;
335 msg->curchunk_hdrlen = hdrlen;
336
337 /* we have already gotten an somt - don't bother parsing */
338 if (recv_hdr.somt && msg->have_somt)
339 return false;
340
341 if (recv_hdr.somt) {
342 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
343 msg->have_somt = true;
344 }
345 if (recv_hdr.eomt)
346 msg->have_eomt = true;
347
348 /* copy the bytes for the remainder of this header chunk */
349 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
350 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
351 } else {
352 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
353 msg->curchunk_idx += replybuflen;
354 }
355
356 if (msg->curchunk_idx >= msg->curchunk_len) {
357 /* do CRC */
358 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
359 /* copy chunk into bigger msg */
360 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
361 msg->curlen += msg->curchunk_len - 1;
362 }
363 return true;
364}
365
366static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
367 struct drm_dp_sideband_msg_reply_body *repmsg)
368{
369 int idx = 1;
370 int i;
371 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
372 idx += 16;
373 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
374 idx++;
375 if (idx > raw->curlen)
376 goto fail_len;
377 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
378 if (raw->msg[idx] & 0x80)
379 repmsg->u.link_addr.ports[i].input_port = 1;
380
381 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
382 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
383
384 idx++;
385 if (idx > raw->curlen)
386 goto fail_len;
387 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
388 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
389 if (repmsg->u.link_addr.ports[i].input_port == 0)
390 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
391 idx++;
392 if (idx > raw->curlen)
393 goto fail_len;
394 if (repmsg->u.link_addr.ports[i].input_port == 0) {
395 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
396 idx++;
397 if (idx > raw->curlen)
398 goto fail_len;
399 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
400 idx += 16;
401 if (idx > raw->curlen)
402 goto fail_len;
403 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
404 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
405 idx++;
406
407 }
408 if (idx > raw->curlen)
409 goto fail_len;
410 }
411
412 return true;
413fail_len:
414 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
415 return false;
416}
417
418static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
419 struct drm_dp_sideband_msg_reply_body *repmsg)
420{
421 int idx = 1;
422 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
423 idx++;
424 if (idx > raw->curlen)
425 goto fail_len;
426 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
427 if (idx > raw->curlen)
428 goto fail_len;
429
430 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
431 return true;
432fail_len:
433 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
434 return false;
435}
436
437static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
438 struct drm_dp_sideband_msg_reply_body *repmsg)
439{
440 int idx = 1;
441 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
442 idx++;
443 if (idx > raw->curlen)
444 goto fail_len;
445 return true;
446fail_len:
447 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
448 return false;
449}
450
451static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
452 struct drm_dp_sideband_msg_reply_body *repmsg)
453{
454 int idx = 1;
455
456 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
457 idx++;
458 if (idx > raw->curlen)
459 goto fail_len;
460 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
461 idx++;
462 /* TODO check */
463 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
464 return true;
465fail_len:
466 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
467 return false;
468}
469
470static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
471 struct drm_dp_sideband_msg_reply_body *repmsg)
472{
473 int idx = 1;
474 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
475 idx++;
476 if (idx > raw->curlen)
477 goto fail_len;
478 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
479 idx += 2;
480 if (idx > raw->curlen)
481 goto fail_len;
482 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
483 idx += 2;
484 if (idx > raw->curlen)
485 goto fail_len;
486 return true;
487fail_len:
488 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
489 return false;
490}
491
492static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
493 struct drm_dp_sideband_msg_reply_body *repmsg)
494{
495 int idx = 1;
496 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
497 idx++;
498 if (idx > raw->curlen)
499 goto fail_len;
500 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
501 idx++;
502 if (idx > raw->curlen)
503 goto fail_len;
504 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
505 idx += 2;
506 if (idx > raw->curlen)
507 goto fail_len;
508 return true;
509fail_len:
510 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
511 return false;
512}
513
514static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
515 struct drm_dp_sideband_msg_reply_body *repmsg)
516{
517 int idx = 1;
518 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
519 idx++;
520 if (idx > raw->curlen)
521 goto fail_len;
522 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
523 idx += 2;
524 if (idx > raw->curlen)
525 goto fail_len;
526 return true;
527fail_len:
528 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
529 return false;
530}
531
532static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
533 struct drm_dp_sideband_msg_reply_body *msg)
534{
535 memset(msg, 0, sizeof(*msg));
536 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
537 msg->req_type = (raw->msg[0] & 0x7f);
538
539 if (msg->reply_type) {
540 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
541 msg->u.nak.reason = raw->msg[17];
542 msg->u.nak.nak_data = raw->msg[18];
543 return false;
544 }
545
546 switch (msg->req_type) {
547 case DP_LINK_ADDRESS:
548 return drm_dp_sideband_parse_link_address(raw, msg);
549 case DP_QUERY_PAYLOAD:
550 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
551 case DP_REMOTE_DPCD_READ:
552 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
553 case DP_REMOTE_DPCD_WRITE:
554 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
555 case DP_REMOTE_I2C_READ:
556 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
557 case DP_ENUM_PATH_RESOURCES:
558 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
559 case DP_ALLOCATE_PAYLOAD:
560 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
561 default:
562 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
563 return false;
564 }
565}
566
567static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
568 struct drm_dp_sideband_msg_req_body *msg)
569{
570 int idx = 1;
571
572 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
573 idx++;
574 if (idx > raw->curlen)
575 goto fail_len;
576
577 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
578 idx += 16;
579 if (idx > raw->curlen)
580 goto fail_len;
581
582 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
583 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
584 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
585 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
586 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
587 idx++;
588 return true;
589fail_len:
590 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
591 return false;
592}
593
594static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
595 struct drm_dp_sideband_msg_req_body *msg)
596{
597 int idx = 1;
598
599 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
600 idx++;
601 if (idx > raw->curlen)
602 goto fail_len;
603
604 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
605 idx += 16;
606 if (idx > raw->curlen)
607 goto fail_len;
608
609 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
610 idx++;
611 return true;
612fail_len:
613 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
614 return false;
615}
616
617static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
618 struct drm_dp_sideband_msg_req_body *msg)
619{
620 memset(msg, 0, sizeof(*msg));
621 msg->req_type = (raw->msg[0] & 0x7f);
622
623 switch (msg->req_type) {
624 case DP_CONNECTION_STATUS_NOTIFY:
625 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
626 case DP_RESOURCE_STATUS_NOTIFY:
627 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
628 default:
629 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
630 return false;
631 }
632}
633
634static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
635{
636 struct drm_dp_sideband_msg_req_body req;
637
638 req.req_type = DP_REMOTE_DPCD_WRITE;
639 req.u.dpcd_write.port_number = port_num;
640 req.u.dpcd_write.dpcd_address = offset;
641 req.u.dpcd_write.num_bytes = num_bytes;
642 req.u.dpcd_write.bytes = bytes;
643 drm_dp_encode_sideband_req(&req, msg);
644
645 return 0;
646}
647
648static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
649{
650 struct drm_dp_sideband_msg_req_body req;
651
652 req.req_type = DP_LINK_ADDRESS;
653 drm_dp_encode_sideband_req(&req, msg);
654 return 0;
655}
656
657static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
658{
659 struct drm_dp_sideband_msg_req_body req;
660
661 req.req_type = DP_ENUM_PATH_RESOURCES;
662 req.u.port_num.port_number = port_num;
663 drm_dp_encode_sideband_req(&req, msg);
664 msg->path_msg = true;
665 return 0;
666}
667
668static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
ef8f9bea
LY		 669 u8 vcpi, uint16_t pbn,
670 u8 number_sdp_streams,
671 u8 *sdp_stream_sink)
ad7f8a1f
DA		 672{
673 struct drm_dp_sideband_msg_req_body req;
674 memset(&req, 0, sizeof(req));
675 req.req_type = DP_ALLOCATE_PAYLOAD;
676 req.u.allocate_payload.port_number = port_num;
677 req.u.allocate_payload.vcpi = vcpi;
678 req.u.allocate_payload.pbn = pbn;
ef8f9bea
LY		 679 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
680 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
681 number_sdp_streams);
ad7f8a1f
DA		 682 drm_dp_encode_sideband_req(&req, msg);
683 msg->path_msg = true;
684 return 0;
685}
686
687static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
688 struct drm_dp_vcpi *vcpi)
689{
dfda0df3 690 int ret, vcpi_ret;
ad7f8a1f
DA		 691
692 mutex_lock(&mgr->payload_lock);
693 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
694 if (ret > mgr->max_payloads) {
695 ret = -EINVAL;
696 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
697 goto out_unlock;
698 }
699
dfda0df3
DA		 700 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
701 if (vcpi_ret > mgr->max_payloads) {
702 ret = -EINVAL;
703 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
704 goto out_unlock;
705 }
706
ad7f8a1f 707 set_bit(ret, &mgr->payload_mask);
dfda0df3
DA		 708 set_bit(vcpi_ret, &mgr->vcpi_mask);
709 vcpi->vcpi = vcpi_ret + 1;
ad7f8a1f
DA		 710 mgr->proposed_vcpis[ret - 1] = vcpi;
711out_unlock:
712 mutex_unlock(&mgr->payload_lock);
713 return ret;
714}
715
716static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
dfda0df3 717 int vcpi)
ad7f8a1f 718{
dfda0df3
DA		 719 int i;
720 if (vcpi == 0)
ad7f8a1f
DA		 721 return;
722
723 mutex_lock(&mgr->payload_lock);
dfda0df3
DA		 724 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
725 clear_bit(vcpi - 1, &mgr->vcpi_mask);
726
727 for (i = 0; i < mgr->max_payloads; i++) {
728 if (mgr->proposed_vcpis[i])
729 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
730 mgr->proposed_vcpis[i] = NULL;
731 clear_bit(i + 1, &mgr->payload_mask);
732 }
733 }
ad7f8a1f
DA		 734 mutex_unlock(&mgr->payload_lock);
735}
736
737static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
738 struct drm_dp_sideband_msg_tx *txmsg)
739{
992d38cc 740 unsigned int state;
cd961bb9
DV		 741
742 /*
743 * All updates to txmsg->state are protected by mgr->qlock, and the two
744 * cases we check here are terminal states. For those the barriers
745 * provided by the wake_up/wait_event pair are enough.
746 */
992d38cc
CW		 747 state = READ_ONCE(txmsg->state);
748 return (state == DRM_DP_SIDEBAND_TX_RX ||
749 state == DRM_DP_SIDEBAND_TX_TIMEOUT);
ad7f8a1f
DA		 750}
751
752static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
753 struct drm_dp_sideband_msg_tx *txmsg)
754{
755 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
756 int ret;
757
758 ret = wait_event_timeout(mgr->tx_waitq,
759 check_txmsg_state(mgr, txmsg),
760 (4 * HZ));
761 mutex_lock(&mstb->mgr->qlock);
762 if (ret > 0) {
763 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
764 ret = -EIO;
765 goto out;
766 }
767 } else {
768 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
769
770 /* dump some state */
771 ret = -EIO;
772
773 /* remove from q */
774 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
775 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
776 list_del(&txmsg->next);
777 }
778
779 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
780 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
781 mstb->tx_slots[txmsg->seqno] = NULL;
782 }
783 }
784out:
785 mutex_unlock(&mgr->qlock);
786
787 return ret;
788}
789
790static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
791{
792 struct drm_dp_mst_branch *mstb;
793
794 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
795 if (!mstb)
796 return NULL;
797
798 mstb->lct = lct;
799 if (lct > 1)
800 memcpy(mstb->rad, rad, lct / 2);
801 INIT_LIST_HEAD(&mstb->ports);
802 kref_init(&mstb->kref);
803 return mstb;
804}
805
91a25e46
ML		 806static void drm_dp_free_mst_port(struct kref *kref);
807
808static void drm_dp_free_mst_branch_device(struct kref *kref)
809{
810 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
811 if (mstb->port_parent) {
812 if (list_empty(&mstb->port_parent->next))
813 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
814 }
815 kfree(mstb);
816}
817
ad7f8a1f
DA		 818static void drm_dp_destroy_mst_branch_device(struct kref *kref)
819{
820 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
821 struct drm_dp_mst_port *port, *tmp;
822 bool wake_tx = false;
823
91a25e46
ML		 824 /*
825 * init kref again to be used by ports to remove mst branch when it is
826 * not needed anymore
827 */
828 kref_init(kref);
829
830 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
831 kref_get(&mstb->port_parent->kref);
832
ad7f8a1f
DA		 833 /*
834 * destroy all ports - don't need lock
835 * as there are no more references to the mst branch
836 * device at this point.
837 */
838 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
839 list_del(&port->next);
840 drm_dp_put_port(port);
841 }
842
843 /* drop any tx slots msg */
844 mutex_lock(&mstb->mgr->qlock);
845 if (mstb->tx_slots[0]) {
846 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
847 mstb->tx_slots[0] = NULL;
848 wake_tx = true;
849 }
850 if (mstb->tx_slots[1]) {
851 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
852 mstb->tx_slots[1] = NULL;
853 wake_tx = true;
854 }
855 mutex_unlock(&mstb->mgr->qlock);
856
857 if (wake_tx)
68e989dc 858 wake_up_all(&mstb->mgr->tx_waitq);
91a25e46
ML		 859
860 kref_put(kref, drm_dp_free_mst_branch_device);
ad7f8a1f
DA		 861}
862
863static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
864{
865 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
866}
867
868
869static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
870{
0391359d
DV		 871 struct drm_dp_mst_branch *mstb;
872
ad7f8a1f
DA		 873 switch (old_pdt) {
874 case DP_PEER_DEVICE_DP_LEGACY_CONV:
875 case DP_PEER_DEVICE_SST_SINK:
876 /* remove i2c over sideband */
877 drm_dp_mst_unregister_i2c_bus(&port->aux);
878 break;
879 case DP_PEER_DEVICE_MST_BRANCHING:
0391359d 880 mstb = port->mstb;
ad7f8a1f 881 port->mstb = NULL;
0391359d 882 drm_dp_put_mst_branch_device(mstb);
ad7f8a1f
DA		 883 break;
884 }
885}
886
887static void drm_dp_destroy_port(struct kref *kref)
888{
889 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
890 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
df4839fd 891
ad7f8a1f
DA		 892 if (!port->input) {
893 port->vcpi.num_slots = 0;
c6a0aed4
DA		 894
895 kfree(port->cached_edid);
6b8eeca6 896
df4839fd
DA		 897 /*
898 * The only time we don't have a connector
899 * on an output port is if the connector init
900 * fails.
901 */
6b8eeca6 902 if (port->connector) {
df4839fd
DA		 903 /* we can't destroy the connector here, as
904 * we might be holding the mode_config.mutex
905 * from an EDID retrieval */
906
6b8eeca6 907 mutex_lock(&mgr->destroy_connector_lock);
91a25e46 908 kref_get(&port->parent->kref);
4772ff03 909 list_add(&port->next, &mgr->destroy_connector_list);
6b8eeca6
DA		 910 mutex_unlock(&mgr->destroy_connector_lock);
911 schedule_work(&mgr->destroy_connector_work);
4772ff03 912 return;
6b8eeca6 913 }
df4839fd
DA		 914 /* no need to clean up vcpi
915 * as if we have no connector we never setup a vcpi */
ad7f8a1f 916 drm_dp_port_teardown_pdt(port, port->pdt);
36e3fa6a 917 port->pdt = DP_PEER_DEVICE_NONE;
ad7f8a1f
DA		 918 }
919 kfree(port);
ad7f8a1f
DA		 920}
921
922static void drm_dp_put_port(struct drm_dp_mst_port *port)
923{
924 kref_put(&port->kref, drm_dp_destroy_port);
925}
926
927static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find)
928{
929 struct drm_dp_mst_port *port;
930 struct drm_dp_mst_branch *rmstb;
931 if (to_find == mstb) {
932 kref_get(&mstb->kref);
933 return mstb;
934 }
935 list_for_each_entry(port, &mstb->ports, next) {
936 if (port->mstb) {
937 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
938 if (rmstb)
939 return rmstb;
940 }
941 }
942 return NULL;
943}
944
945static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
946{
947 struct drm_dp_mst_branch *rmstb = NULL;
948 mutex_lock(&mgr->lock);
949 if (mgr->mst_primary)
950 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
951 mutex_unlock(&mgr->lock);
952 return rmstb;
953}
954
955static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find)
956{
957 struct drm_dp_mst_port *port, *mport;
958
959 list_for_each_entry(port, &mstb->ports, next) {
960 if (port == to_find) {
961 kref_get(&port->kref);
962 return port;
963 }
964 if (port->mstb) {
965 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
966 if (mport)
967 return mport;
968 }
969 }
970 return NULL;
971}
972
973static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
974{
975 struct drm_dp_mst_port *rport = NULL;
976 mutex_lock(&mgr->lock);
977 if (mgr->mst_primary)
978 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
979 mutex_unlock(&mgr->lock);
980 return rport;
981}
982
983static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
984{
985 struct drm_dp_mst_port *port;
986
987 list_for_each_entry(port, &mstb->ports, next) {
988 if (port->port_num == port_num) {
989 kref_get(&port->kref);
990 return port;
991 }
992 }
993
994 return NULL;
995}
996
997/*
998 * calculate a new RAD for this MST branch device
999 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1000 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1001 */
1002static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1003 u8 *rad)
1004{
75af4c8c 1005 int parent_lct = port->parent->lct;
ad7f8a1f 1006 int shift = 4;
75af4c8c
ML		 1007 int idx = (parent_lct - 1) / 2;
1008 if (parent_lct > 1) {
1009 memcpy(rad, port->parent->rad, idx + 1);
1010 shift = (parent_lct % 2) ? 4 : 0;
ad7f8a1f
DA		 1011 } else
1012 rad[0] = 0;
1013
1014 rad[idx] |= port->port_num << shift;
75af4c8c 1015 return parent_lct + 1;
ad7f8a1f
DA		 1016}
1017
1018/*
1019 * return sends link address for new mstb
1020 */
1021static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1022{
1023 int ret;
1024 u8 rad[6], lct;
1025 bool send_link = false;
1026 switch (port->pdt) {
1027 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1028 case DP_PEER_DEVICE_SST_SINK:
1029 /* add i2c over sideband */
1030 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1031 break;
1032 case DP_PEER_DEVICE_MST_BRANCHING:
1033 lct = drm_dp_calculate_rad(port, rad);
1034
1035 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1036 port->mstb->mgr = port->mgr;
1037 port->mstb->port_parent = port;
1038
1039 send_link = true;
1040 break;
1041 }
1042 return send_link;
1043}
1044
5e93b820 1045static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
ad7f8a1f
DA		 1046{
1047 int ret;
5e93b820
HW		 1048
1049 memcpy(mstb->guid, guid, 16);
1050
1051 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1052 if (mstb->port_parent) {
1053 ret = drm_dp_send_dpcd_write(
1054 mstb->mgr,
1055 mstb->port_parent,
1056 DP_GUID,
1057 16,
1058 mstb->guid);
1059 } else {
1060
1061 ret = drm_dp_dpcd_write(
1062 mstb->mgr->aux,
1063 DP_GUID,
1064 mstb->guid,
1065 16);
ad7f8a1f
DA		 1066 }
1067 }
1068}
1069
1c960876
DA		 1070static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1071 int pnum,
d87af4d1
RS		 1072 char *proppath,
1073 size_t proppath_size)
ad7f8a1f
DA		 1074{
1075 int i;
1076 char temp[8];
d87af4d1 1077 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
ad7f8a1f
DA		 1078 for (i = 0; i < (mstb->lct - 1); i++) {
1079 int shift = (i % 2) ? 0 : 4;
7a11a334 1080 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
d87af4d1
RS		 1081 snprintf(temp, sizeof(temp), "-%d", port_num);
1082 strlcat(proppath, temp, proppath_size);
ad7f8a1f 1083 }
1c960876 1084 snprintf(temp, sizeof(temp), "-%d", pnum);
d87af4d1 1085 strlcat(proppath, temp, proppath_size);
ad7f8a1f
DA		 1086}
1087
1088static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
7b0a89a6 1089 struct drm_device *dev,
ad7f8a1f
DA		 1090 struct drm_dp_link_addr_reply_port *port_msg)
1091{
1092 struct drm_dp_mst_port *port;
1093 bool ret;
1094 bool created = false;
1095 int old_pdt = 0;
1096 int old_ddps = 0;
1097 port = drm_dp_get_port(mstb, port_msg->port_number);
1098 if (!port) {
1099 port = kzalloc(sizeof(*port), GFP_KERNEL);
1100 if (!port)
1101 return;
1102 kref_init(&port->kref);
1103 port->parent = mstb;
1104 port->port_num = port_msg->port_number;
1105 port->mgr = mstb->mgr;
1106 port->aux.name = "DPMST";
7b0a89a6 1107 port->aux.dev = dev->dev;
ad7f8a1f
DA		 1108 created = true;
1109 } else {
1110 old_pdt = port->pdt;
1111 old_ddps = port->ddps;
1112 }
1113
1114 port->pdt = port_msg->peer_device_type;
1115 port->input = port_msg->input_port;
1116 port->mcs = port_msg->mcs;
1117 port->ddps = port_msg->ddps;
1118 port->ldps = port_msg->legacy_device_plug_status;
1119 port->dpcd_rev = port_msg->dpcd_revision;
1120 port->num_sdp_streams = port_msg->num_sdp_streams;
1121 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
ad7f8a1f
DA		 1122
1123 /* manage mstb port lists with mgr lock - take a reference
1124 for this list */
1125 if (created) {
1126 mutex_lock(&mstb->mgr->lock);
1127 kref_get(&port->kref);
1128 list_add(&port->next, &mstb->ports);
1129 mutex_unlock(&mstb->mgr->lock);
1130 }
1131
1132 if (old_ddps != port->ddps) {
1133 if (port->ddps) {
ad7f8a1f
DA		 1134 if (!port->input)
1135 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1136 } else {
ad7f8a1f
DA		 1137 port->available_pbn = 0;
1138 }
1139 }
1140
1141 if (old_pdt != port->pdt && !port->input) {
1142 drm_dp_port_teardown_pdt(port, old_pdt);
1143
1144 ret = drm_dp_port_setup_pdt(port);
68d8c9fc 1145 if (ret == true)
ad7f8a1f 1146 drm_dp_send_link_address(mstb->mgr, port->mstb);
ad7f8a1f
DA		 1147 }
1148
1149 if (created && !port->input) {
1150 char proppath[255];
1c960876
DA		 1151
1152 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
ad7f8a1f 1153 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
df4839fd
DA		 1154 if (!port->connector) {
1155 /* remove it from the port list */
1156 mutex_lock(&mstb->mgr->lock);
1157 list_del(&port->next);
1158 mutex_unlock(&mstb->mgr->lock);
1159 /* drop port list reference */
1160 drm_dp_put_port(port);
1161 goto out;
1162 }
4da5caa6
VS		 1163 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1164 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1165 port->port_num >= DP_MST_LOGICAL_PORT_0) {
8ae22cb4
DA		 1166 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1167 drm_mode_connector_set_tile_property(port->connector);
1168 }
d9515c5e 1169 (*mstb->mgr->cbs->register_connector)(port->connector);
ad7f8a1f 1170 }
8ae22cb4 1171
df4839fd 1172out:
ad7f8a1f
DA		 1173 /* put reference to this port */
1174 drm_dp_put_port(port);
1175}
1176
1177static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1178 struct drm_dp_connection_status_notify *conn_stat)
1179{
1180 struct drm_dp_mst_port *port;
1181 int old_pdt;
1182 int old_ddps;
1183 bool dowork = false;
1184 port = drm_dp_get_port(mstb, conn_stat->port_number);
1185 if (!port)
1186 return;
1187
1188 old_ddps = port->ddps;
1189 old_pdt = port->pdt;
1190 port->pdt = conn_stat->peer_device_type;
1191 port->mcs = conn_stat->message_capability_status;
1192 port->ldps = conn_stat->legacy_device_plug_status;
1193 port->ddps = conn_stat->displayport_device_plug_status;
1194
1195 if (old_ddps != port->ddps) {
1196 if (port->ddps) {
8ae22cb4 1197 dowork = true;
ad7f8a1f 1198 } else {
ad7f8a1f
DA		 1199 port->available_pbn = 0;
1200 }
1201 }
1202 if (old_pdt != port->pdt && !port->input) {
1203 drm_dp_port_teardown_pdt(port, old_pdt);
1204
1205 if (drm_dp_port_setup_pdt(port))
1206 dowork = true;
1207 }
1208
1209 drm_dp_put_port(port);
1210 if (dowork)
1211 queue_work(system_long_wq, &mstb->mgr->work);
1212
1213}
1214
1215static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1216 u8 lct, u8 *rad)
1217{
1218 struct drm_dp_mst_branch *mstb;
1219 struct drm_dp_mst_port *port;
1220 int i;
1221 /* find the port by iterating down */
9eb1e57f
DA		 1222
1223 mutex_lock(&mgr->lock);
ad7f8a1f
DA		 1224 mstb = mgr->mst_primary;
1225
1226 for (i = 0; i < lct - 1; i++) {
1227 int shift = (i % 2) ? 0 : 4;
7a11a334 1228 int port_num = (rad[i / 2] >> shift) & 0xf;
ad7f8a1f
DA		 1229
1230 list_for_each_entry(port, &mstb->ports, next) {
1231 if (port->port_num == port_num) {
30730c7f
AR		 1232 mstb = port->mstb;
1233 if (!mstb) {
ad7f8a1f 1234 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
30730c7f 1235 goto out;
ad7f8a1f
DA		 1236 }
1237
ad7f8a1f
DA		 1238 break;
1239 }
1240 }
1241 }
1242 kref_get(&mstb->kref);
30730c7f 1243out:
9eb1e57f 1244 mutex_unlock(&mgr->lock);
ad7f8a1f
DA		 1245 return mstb;
1246}
1247
bd934320
ML		 1248static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1249 struct drm_dp_mst_branch *mstb,
1250 uint8_t *guid)
1251{
1252 struct drm_dp_mst_branch *found_mstb;
1253 struct drm_dp_mst_port *port;
1254
5e93b820
HW		 1255 if (memcmp(mstb->guid, guid, 16) == 0)
1256 return mstb;
1257
1258
bd934320
ML		 1259 list_for_each_entry(port, &mstb->ports, next) {
1260 if (!port->mstb)
1261 continue;
1262
bd934320
ML		 1263 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1264
1265 if (found_mstb)
1266 return found_mstb;
1267 }
1268
1269 return NULL;
1270}
1271
1272static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1273 struct drm_dp_mst_topology_mgr *mgr,
1274 uint8_t *guid)
1275{
1276 struct drm_dp_mst_branch *mstb;
1277
1278 /* find the port by iterating down */
1279 mutex_lock(&mgr->lock);
1280
5e93b820 1281 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
bd934320
ML		 1282
1283 if (mstb)
1284 kref_get(&mstb->kref);
1285
1286 mutex_unlock(&mgr->lock);
1287 return mstb;
1288}
1289
ad7f8a1f
DA		 1290static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1291 struct drm_dp_mst_branch *mstb)
1292{
1293 struct drm_dp_mst_port *port;
9254ec49 1294 struct drm_dp_mst_branch *mstb_child;
68d8c9fc 1295 if (!mstb->link_address_sent)
ad7f8a1f 1296 drm_dp_send_link_address(mgr, mstb);
68d8c9fc 1297
ad7f8a1f
DA		 1298 list_for_each_entry(port, &mstb->ports, next) {
1299 if (port->input)
1300 continue;
1301
8ae22cb4 1302 if (!port->ddps)
ad7f8a1f
DA		 1303 continue;
1304
1305 if (!port->available_pbn)
1306 drm_dp_send_enum_path_resources(mgr, mstb, port);
1307
9254ec49
DV		 1308 if (port->mstb) {
1309 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1310 if (mstb_child) {
1311 drm_dp_check_and_send_link_address(mgr, mstb_child);
1312 drm_dp_put_mst_branch_device(mstb_child);
1313 }
1314 }
ad7f8a1f
DA		 1315 }
1316}
1317
1318static void drm_dp_mst_link_probe_work(struct work_struct *work)
1319{
1320 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
9254ec49 1321 struct drm_dp_mst_branch *mstb;
ad7f8a1f 1322
9254ec49
DV		 1323 mutex_lock(&mgr->lock);
1324 mstb = mgr->mst_primary;
1325 if (mstb) {
1326 kref_get(&mstb->kref);
1327 }
1328 mutex_unlock(&mgr->lock);
1329 if (mstb) {
1330 drm_dp_check_and_send_link_address(mgr, mstb);
1331 drm_dp_put_mst_branch_device(mstb);
1332 }
ad7f8a1f
DA		 1333}
1334
1335static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1336 u8 *guid)
1337{
1338 static u8 zero_guid[16];
1339
1340 if (!memcmp(guid, zero_guid, 16)) {
1341 u64 salt = get_jiffies_64();
1342 memcpy(&guid[0], &salt, sizeof(u64));
1343 memcpy(&guid[8], &salt, sizeof(u64));
1344 return false;
1345 }
1346 return true;
1347}
1348
1349#if 0
1350static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1351{
1352 struct drm_dp_sideband_msg_req_body req;
1353
1354 req.req_type = DP_REMOTE_DPCD_READ;
1355 req.u.dpcd_read.port_number = port_num;
1356 req.u.dpcd_read.dpcd_address = offset;
1357 req.u.dpcd_read.num_bytes = num_bytes;
1358 drm_dp_encode_sideband_req(&req, msg);
1359
1360 return 0;
1361}
1362#endif
1363
1364static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1365 bool up, u8 *msg, int len)
1366{
1367 int ret;
1368 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1369 int tosend, total, offset;
1370 int retries = 0;
1371
1372retry:
1373 total = len;
1374 offset = 0;
1375 do {
1376 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1377
1378 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1379 &msg[offset],
1380 tosend);
1381 if (ret != tosend) {
1382 if (ret == -EIO && retries < 5) {
1383 retries++;
1384 goto retry;
1385 }
1386 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
ad7f8a1f
DA		 1387
1388 return -EIO;
1389 }
1390 offset += tosend;
1391 total -= tosend;
1392 } while (total > 0);
1393 return 0;
1394}
1395
1396static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1397 struct drm_dp_sideband_msg_tx *txmsg)
1398{
1399 struct drm_dp_mst_branch *mstb = txmsg->dst;
bd934320 1400 u8 req_type;
ad7f8a1f
DA		 1401
1402 /* both msg slots are full */
1403 if (txmsg->seqno == -1) {
1404 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1405 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1406 return -EAGAIN;
1407 }
1408 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1409 txmsg->seqno = mstb->last_seqno;
1410 mstb->last_seqno ^= 1;
1411 } else if (mstb->tx_slots[0] == NULL)
1412 txmsg->seqno = 0;
1413 else
1414 txmsg->seqno = 1;
1415 mstb->tx_slots[txmsg->seqno] = txmsg;
1416 }
bd934320
ML		 1417
1418 req_type = txmsg->msg[0] & 0x7f;
1419 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1420 req_type == DP_RESOURCE_STATUS_NOTIFY)
1421 hdr->broadcast = 1;
1422 else
1423 hdr->broadcast = 0;
ad7f8a1f
DA		 1424 hdr->path_msg = txmsg->path_msg;
1425 hdr->lct = mstb->lct;
1426 hdr->lcr = mstb->lct - 1;
1427 if (mstb->lct > 1)
1428 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1429 hdr->seqno = txmsg->seqno;
1430 return 0;
1431}
1432/*
1433 * process a single block of the next message in the sideband queue
1434 */
1435static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1436 struct drm_dp_sideband_msg_tx *txmsg,
1437 bool up)
1438{
1439 u8 chunk[48];
1440 struct drm_dp_sideband_msg_hdr hdr;
1441 int len, space, idx, tosend;
1442 int ret;
1443
bf3719c0
DL		 1444 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1445
ad7f8a1f
DA		 1446 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1447 txmsg->seqno = -1;
1448 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1449 }
1450
1451 /* make hdr from dst mst - for replies use seqno
1452 otherwise assign one */
1453 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1454 if (ret < 0)
1455 return ret;
1456
1457 /* amount left to send in this message */
1458 len = txmsg->cur_len - txmsg->cur_offset;
1459
1460 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1461 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1462
1463 tosend = min(len, space);
1464 if (len == txmsg->cur_len)
1465 hdr.somt = 1;
1466 if (space >= len)
1467 hdr.eomt = 1;
1468
1469
1470 hdr.msg_len = tosend + 1;
1471 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1472 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1473 /* add crc at end */
1474 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1475 idx += tosend + 1;
1476
1477 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1478 if (ret) {
1479 DRM_DEBUG_KMS("sideband msg failed to send\n");
1480 return ret;
1481 }
1482
1483 txmsg->cur_offset += tosend;
1484 if (txmsg->cur_offset == txmsg->cur_len) {
1485 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1486 return 1;
1487 }
1488 return 0;
1489}
1490
ad7f8a1f
DA		 1491static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1492{
1493 struct drm_dp_sideband_msg_tx *txmsg;
1494 int ret;
1495
cd961bb9
DV		 1496 WARN_ON(!mutex_is_locked(&mgr->qlock));
1497
ad7f8a1f 1498 /* construct a chunk from the first msg in the tx_msg queue */
cb021a3e 1499 if (list_empty(&mgr->tx_msg_downq))
ad7f8a1f 1500 return;
ad7f8a1f
DA		 1501
1502 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1503 ret = process_single_tx_qlock(mgr, txmsg, false);
1504 if (ret == 1) {
1505 /* txmsg is sent it should be in the slots now */
1506 list_del(&txmsg->next);
1507 } else if (ret) {
1508 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1509 list_del(&txmsg->next);
1510 if (txmsg->seqno != -1)
1511 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1512 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
68e989dc 1513 wake_up_all(&mgr->tx_waitq);
ad7f8a1f 1514 }
ad7f8a1f
DA		 1515}
1516
1517/* called holding qlock */
1f16ee7f
ML		 1518static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1519 struct drm_dp_sideband_msg_tx *txmsg)
ad7f8a1f 1520{
ad7f8a1f
DA		 1521 int ret;
1522
1523 /* construct a chunk from the first msg in the tx_msg queue */
ad7f8a1f 1524 ret = process_single_tx_qlock(mgr, txmsg, true);
1f16ee7f
ML		 1525
1526 if (ret != 1)
ad7f8a1f 1527 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1f16ee7f
ML		 1528
1529 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
ad7f8a1f
DA		 1530}
1531
1532static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1533 struct drm_dp_sideband_msg_tx *txmsg)
1534{
1535 mutex_lock(&mgr->qlock);
1536 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
cb021a3e 1537 if (list_is_singular(&mgr->tx_msg_downq))
ad7f8a1f
DA		 1538 process_single_down_tx_qlock(mgr);
1539 mutex_unlock(&mgr->qlock);
1540}
1541
68d8c9fc
DA		 1542static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1543 struct drm_dp_mst_branch *mstb)
ad7f8a1f
DA		 1544{
1545 int len;
1546 struct drm_dp_sideband_msg_tx *txmsg;
1547 int ret;
1548
1549 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1550 if (!txmsg)
68d8c9fc 1551 return;
ad7f8a1f
DA		 1552
1553 txmsg->dst = mstb;
1554 len = build_link_address(txmsg);
1555
68d8c9fc 1556 mstb->link_address_sent = true;
ad7f8a1f
DA		 1557 drm_dp_queue_down_tx(mgr, txmsg);
1558
1559 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1560 if (ret > 0) {
1561 int i;
1562
1563 if (txmsg->reply.reply_type == 1)
1564 DRM_DEBUG_KMS("link address nak received\n");
1565 else {
1566 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1567 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1568 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,
1569 txmsg->reply.u.link_addr.ports[i].input_port,
1570 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1571 txmsg->reply.u.link_addr.ports[i].port_number,
1572 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1573 txmsg->reply.u.link_addr.ports[i].mcs,
1574 txmsg->reply.u.link_addr.ports[i].ddps,
1575 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1576 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1577 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1578 }
5e93b820
HW		 1579
1580 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1581
ad7f8a1f
DA		 1582 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1583 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1584 }
8ae22cb4 1585 (*mgr->cbs->hotplug)(mgr);
ad7f8a1f 1586 }
68d8c9fc
DA		 1587 } else {
1588 mstb->link_address_sent = false;
ad7f8a1f 1589 DRM_DEBUG_KMS("link address failed %d\n", ret);
68d8c9fc 1590 }
ad7f8a1f
DA		 1591
1592 kfree(txmsg);
ad7f8a1f
DA		 1593}
1594
1595static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1596 struct drm_dp_mst_branch *mstb,
1597 struct drm_dp_mst_port *port)
1598{
1599 int len;
1600 struct drm_dp_sideband_msg_tx *txmsg;
1601 int ret;
1602
1603 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1604 if (!txmsg)
1605 return -ENOMEM;
1606
1607 txmsg->dst = mstb;
1608 len = build_enum_path_resources(txmsg, port->port_num);
1609
1610 drm_dp_queue_down_tx(mgr, txmsg);
1611
1612 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1613 if (ret > 0) {
1614 if (txmsg->reply.reply_type == 1)
1615 DRM_DEBUG_KMS("enum path resources nak received\n");
1616 else {
1617 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1618 DRM_ERROR("got incorrect port in response\n");
1619 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,
1620 txmsg->reply.u.path_resources.avail_payload_bw_number);
1621 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1622 }
1623 }
1624
1625 kfree(txmsg);
1626 return 0;
1627}
1628
91a25e46
ML		 1629static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1630{
1631 if (!mstb->port_parent)
1632 return NULL;
1633
1634 if (mstb->port_parent->mstb != mstb)
1635 return mstb->port_parent;
1636
1637 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1638}
1639
1640static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1641 struct drm_dp_mst_branch *mstb,
1642 int *port_num)
1643{
1644 struct drm_dp_mst_branch *rmstb = NULL;
1645 struct drm_dp_mst_port *found_port;
1646 mutex_lock(&mgr->lock);
1647 if (mgr->mst_primary) {
1648 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1649
1650 if (found_port) {
1651 rmstb = found_port->parent;
1652 kref_get(&rmstb->kref);
1653 *port_num = found_port->port_num;
1654 }
1655 }
1656 mutex_unlock(&mgr->lock);
1657 return rmstb;
1658}
1659
8fa6a425
TR		 1660static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1661 struct drm_dp_mst_port *port,
1662 int id,
1663 int pbn)
ad7f8a1f
DA		 1664{
1665 struct drm_dp_sideband_msg_tx *txmsg;
1666 struct drm_dp_mst_branch *mstb;
91a25e46 1667 int len, ret, port_num;
ef8f9bea
LY		 1668 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1669 int i;
ad7f8a1f 1670
deba0a2a 1671 port = drm_dp_get_validated_port_ref(mgr, port);
1672 if (!port)
1673 return -EINVAL;
1674
91a25e46 1675 port_num = port->port_num;
ad7f8a1f 1676 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
91a25e46
ML		 1677 if (!mstb) {
1678 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1679
deba0a2a 1680 if (!mstb) {
1681 drm_dp_put_port(port);
91a25e46 1682 return -EINVAL;
deba0a2a 1683 }
91a25e46 1684 }
ad7f8a1f
DA		 1685
1686 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1687 if (!txmsg) {
1688 ret = -ENOMEM;
1689 goto fail_put;
1690 }
1691
ef8f9bea
LY		 1692 for (i = 0; i < port->num_sdp_streams; i++)
1693 sinks[i] = i;
1694
ad7f8a1f 1695 txmsg->dst = mstb;
91a25e46 1696 len = build_allocate_payload(txmsg, port_num,
ad7f8a1f 1697 id,
ef8f9bea 1698 pbn, port->num_sdp_streams, sinks);
ad7f8a1f
DA		 1699
1700 drm_dp_queue_down_tx(mgr, txmsg);
1701
1702 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1703 if (ret > 0) {
1704 if (txmsg->reply.reply_type == 1) {
1705 ret = -EINVAL;
1706 } else
1707 ret = 0;
1708 }
1709 kfree(txmsg);
1710fail_put:
1711 drm_dp_put_mst_branch_device(mstb);
deba0a2a 1712 drm_dp_put_port(port);
ad7f8a1f
DA		 1713 return ret;
1714}
1715
1716static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1717 int id,
1718 struct drm_dp_payload *payload)
1719{
1720 int ret;
1721
1722 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1723 if (ret < 0) {
1724 payload->payload_state = 0;
1725 return ret;
1726 }
1727 payload->payload_state = DP_PAYLOAD_LOCAL;
1728 return 0;
1729}
1730
8fa6a425
TR		 1731static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1732 struct drm_dp_mst_port *port,
1733 int id,
1734 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1735{
1736 int ret;
1737 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1738 if (ret < 0)
1739 return ret;
1740 payload->payload_state = DP_PAYLOAD_REMOTE;
1741 return ret;
1742}
1743
8fa6a425
TR		 1744static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1745 struct drm_dp_mst_port *port,
1746 int id,
1747 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1748{
1749 DRM_DEBUG_KMS("\n");
1750 /* its okay for these to fail */
1751 if (port) {
1752 drm_dp_payload_send_msg(mgr, port, id, 0);
1753 }
1754
1755 drm_dp_dpcd_write_payload(mgr, id, payload);
dfda0df3 1756 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
ad7f8a1f
DA		 1757 return 0;
1758}
1759
8fa6a425
TR		 1760static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1761 int id,
1762 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1763{
1764 payload->payload_state = 0;
1765 return 0;
1766}
1767
1768/**
1769 * drm_dp_update_payload_part1() - Execute payload update part 1
1770 * @mgr: manager to use.
1771 *
1772 * This iterates over all proposed virtual channels, and tries to
1773 * allocate space in the link for them. For 0->slots transitions,
1774 * this step just writes the VCPI to the MST device. For slots->0
1775 * transitions, this writes the updated VCPIs and removes the
1776 * remote VC payloads.
1777 *
1778 * after calling this the driver should generate ACT and payload
1779 * packets.
1780 */
1781int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1782{
dfda0df3 1783 int i, j;
ad7f8a1f
DA		 1784 int cur_slots = 1;
1785 struct drm_dp_payload req_payload;
1786 struct drm_dp_mst_port *port;
1787
1788 mutex_lock(&mgr->payload_lock);
1789 for (i = 0; i < mgr->max_payloads; i++) {
1790 /* solve the current payloads - compare to the hw ones
1791 - update the hw view */
1792 req_payload.start_slot = cur_slots;
1793 if (mgr->proposed_vcpis[i]) {
1794 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
263efde3 1795 port = drm_dp_get_validated_port_ref(mgr, port);
1796 if (!port) {
1797 mutex_unlock(&mgr->payload_lock);
1798 return -EINVAL;
1799 }
ad7f8a1f 1800 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
6cecdf7a 1801 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
ad7f8a1f
DA		 1802 } else {
1803 port = NULL;
1804 req_payload.num_slots = 0;
1805 }
dfda0df3
DA		 1806
1807 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1808 mgr->payloads[i].start_slot = req_payload.start_slot;
1809 }
ad7f8a1f 1810 /* work out what is required to happen with this payload */
dfda0df3 1811 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
ad7f8a1f
DA		 1812
1813 /* need to push an update for this payload */
1814 if (req_payload.num_slots) {
dfda0df3 1815 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
ad7f8a1f 1816 mgr->payloads[i].num_slots = req_payload.num_slots;
6cecdf7a 1817 mgr->payloads[i].vcpi = req_payload.vcpi;
ad7f8a1f
DA		 1818 } else if (mgr->payloads[i].num_slots) {
1819 mgr->payloads[i].num_slots = 0;
bb08c04d 1820 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
ad7f8a1f 1821 req_payload.payload_state = mgr->payloads[i].payload_state;
dfda0df3
DA		 1822 mgr->payloads[i].start_slot = 0;
1823 }
ad7f8a1f
DA		 1824 mgr->payloads[i].payload_state = req_payload.payload_state;
1825 }
1826 cur_slots += req_payload.num_slots;
263efde3 1827
1828 if (port)
1829 drm_dp_put_port(port);
ad7f8a1f 1830 }
dfda0df3
DA		 1831
1832 for (i = 0; i < mgr->max_payloads; i++) {
1833 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1834 DRM_DEBUG_KMS("removing payload %d\n", i);
1835 for (j = i; j < mgr->max_payloads - 1; j++) {
1836 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1837 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1838 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1839 set_bit(j + 1, &mgr->payload_mask);
1840 } else {
1841 clear_bit(j + 1, &mgr->payload_mask);
1842 }
1843 }
1844 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1845 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1846 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1847
1848 }
1849 }
ad7f8a1f
DA		 1850 mutex_unlock(&mgr->payload_lock);
1851
1852 return 0;
1853}
1854EXPORT_SYMBOL(drm_dp_update_payload_part1);
1855
1856/**
1857 * drm_dp_update_payload_part2() - Execute payload update part 2
1858 * @mgr: manager to use.
1859 *
1860 * This iterates over all proposed virtual channels, and tries to
1861 * allocate space in the link for them. For 0->slots transitions,
1862 * this step writes the remote VC payload commands. For slots->0
1863 * this just resets some internal state.
1864 */
1865int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1866{
1867 struct drm_dp_mst_port *port;
1868 int i;
7389ad4b 1869 int ret = 0;
ad7f8a1f
DA		 1870 mutex_lock(&mgr->payload_lock);
1871 for (i = 0; i < mgr->max_payloads; i++) {
1872
1873 if (!mgr->proposed_vcpis[i])
1874 continue;
1875
1876 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1877
1878 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1879 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
dfda0df3 1880 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
ad7f8a1f 1881 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
dfda0df3 1882 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
ad7f8a1f
DA		 1883 }
1884 if (ret) {
1885 mutex_unlock(&mgr->payload_lock);
1886 return ret;
1887 }
1888 }
1889 mutex_unlock(&mgr->payload_lock);
1890 return 0;
1891}
1892EXPORT_SYMBOL(drm_dp_update_payload_part2);
1893
1894#if 0 /* unused as of yet */
1895static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1896 struct drm_dp_mst_port *port,
1897 int offset, int size)
1898{
1899 int len;
1900 struct drm_dp_sideband_msg_tx *txmsg;
1901
1902 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1903 if (!txmsg)
1904 return -ENOMEM;
1905
1906 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1907 txmsg->dst = port->parent;
1908
1909 drm_dp_queue_down_tx(mgr, txmsg);
1910
1911 return 0;
1912}
1913#endif
1914
1915static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1916 struct drm_dp_mst_port *port,
1917 int offset, int size, u8 *bytes)
1918{
1919 int len;
1920 int ret;
1921 struct drm_dp_sideband_msg_tx *txmsg;
1922 struct drm_dp_mst_branch *mstb;
1923
1924 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1925 if (!mstb)
1926 return -EINVAL;
1927
1928 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1929 if (!txmsg) {
1930 ret = -ENOMEM;
1931 goto fail_put;
1932 }
1933
1934 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1935 txmsg->dst = mstb;
1936
1937 drm_dp_queue_down_tx(mgr, txmsg);
1938
1939 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1940 if (ret > 0) {
1941 if (txmsg->reply.reply_type == 1) {
1942 ret = -EINVAL;
1943 } else
1944 ret = 0;
1945 }
1946 kfree(txmsg);
1947fail_put:
1948 drm_dp_put_mst_branch_device(mstb);
1949 return ret;
1950}
1951
1952static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1953{
1954 struct drm_dp_sideband_msg_reply_body reply;
1955
a68d2437 1956 reply.reply_type = 0;
ad7f8a1f
DA		 1957 reply.req_type = req_type;
1958 drm_dp_encode_sideband_reply(&reply, msg);
1959 return 0;
1960}
1961
1962static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1963 struct drm_dp_mst_branch *mstb,
1964 int req_type, int seqno, bool broadcast)
1965{
1966 struct drm_dp_sideband_msg_tx *txmsg;
1967
1968 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1969 if (!txmsg)
1970 return -ENOMEM;
1971
1972 txmsg->dst = mstb;
1973 txmsg->seqno = seqno;
1974 drm_dp_encode_up_ack_reply(txmsg, req_type);
1975
1976 mutex_lock(&mgr->qlock);
1f16ee7f
ML		 1977
1978 process_single_up_tx_qlock(mgr, txmsg);
1979
ad7f8a1f 1980 mutex_unlock(&mgr->qlock);
1f16ee7f
ML		 1981
1982 kfree(txmsg);
ad7f8a1f
DA		 1983 return 0;
1984}
1985
b853fdb3
CW		 1986static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
1987 int dp_link_count,
1988 int *out)
ad7f8a1f
DA		 1989{
1990 switch (dp_link_bw) {
b853fdb3
CW		 1991 default:
1992 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1993 dp_link_bw, dp_link_count);
1994 return false;
1995
ad7f8a1f 1996 case DP_LINK_BW_1_62:
b853fdb3
CW		 1997 *out = 3 * dp_link_count;
1998 break;
ad7f8a1f 1999 case DP_LINK_BW_2_7:
b853fdb3
CW		 2000 *out = 5 * dp_link_count;
2001 break;
ad7f8a1f 2002 case DP_LINK_BW_5_4:
b853fdb3
CW		 2003 *out = 10 * dp_link_count;
2004 break;
ad7f8a1f 2005 }
b853fdb3 2006 return true;
ad7f8a1f
DA		 2007}
2008
2009/**
2010 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2011 * @mgr: manager to set state for
2012 * @mst_state: true to enable MST on this connector - false to disable.
2013 *
2014 * This is called by the driver when it detects an MST capable device plugged
2015 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2016 */
2017int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2018{
2019 int ret = 0;
2020 struct drm_dp_mst_branch *mstb = NULL;
2021
2022 mutex_lock(&mgr->lock);
2023 if (mst_state == mgr->mst_state)
2024 goto out_unlock;
2025
2026 mgr->mst_state = mst_state;
2027 /* set the device into MST mode */
2028 if (mst_state) {
2029 WARN_ON(mgr->mst_primary);
2030
2031 /* get dpcd info */
2032 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2033 if (ret != DP_RECEIVER_CAP_SIZE) {
2034 DRM_DEBUG_KMS("failed to read DPCD\n");
2035 goto out_unlock;
2036 }
2037
b853fdb3
CW		 2038 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2039 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2040 &mgr->pbn_div)) {
2041 ret = -EINVAL;
2042 goto out_unlock;
2043 }
2044
ad7f8a1f
DA		 2045 /* add initial branch device at LCT 1 */
2046 mstb = drm_dp_add_mst_branch_device(1, NULL);
2047 if (mstb == NULL) {
2048 ret = -ENOMEM;
2049 goto out_unlock;
2050 }
2051 mstb->mgr = mgr;
2052
2053 /* give this the main reference */
2054 mgr->mst_primary = mstb;
2055 kref_get(&mgr->mst_primary->kref);
2056
c175cd16
AG		 2057 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2058 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2059 if (ret < 0) {
2060 goto out_unlock;
2061 }
2062
ad7f8a1f
DA		 2063 {
2064 struct drm_dp_payload reset_pay;
2065 reset_pay.start_slot = 0;
2066 reset_pay.num_slots = 0x3f;
2067 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2068 }
2069
ad7f8a1f
DA		 2070 queue_work(system_long_wq, &mgr->work);
2071
2072 ret = 0;
2073 } else {
2074 /* disable MST on the device */
2075 mstb = mgr->mst_primary;
2076 mgr->mst_primary = NULL;
2077 /* this can fail if the device is gone */
2078 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2079 ret = 0;
2080 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2081 mgr->payload_mask = 0;
2082 set_bit(0, &mgr->payload_mask);
dfda0df3 2083 mgr->vcpi_mask = 0;
ad7f8a1f
DA		 2084 }
2085
2086out_unlock:
2087 mutex_unlock(&mgr->lock);
2088 if (mstb)
2089 drm_dp_put_mst_branch_device(mstb);
2090 return ret;
2091
2092}
2093EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2094
2095/**
2096 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2097 * @mgr: manager to suspend
2098 *
2099 * This function tells the MST device that we can't handle UP messages
2100 * anymore. This should stop it from sending any since we are suspended.
2101 */
2102void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2103{
2104 mutex_lock(&mgr->lock);
2105 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2106 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2107 mutex_unlock(&mgr->lock);
274d8352
DA		 2108 flush_work(&mgr->work);
2109 flush_work(&mgr->destroy_connector_work);
ad7f8a1f
DA		 2110}
2111EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2112
2113/**
2114 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2115 * @mgr: manager to resume
2116 *
2117 * This will fetch DPCD and see if the device is still there,
2118 * if it is, it will rewrite the MSTM control bits, and return.
2119 *
2120 * if the device fails this returns -1, and the driver should do
2121 * a full MST reprobe, in case we were undocked.
2122 */
2123int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2124{
2125 int ret = 0;
2126
2127 mutex_lock(&mgr->lock);
2128
2129 if (mgr->mst_primary) {
2130 int sret;
1652fce6
L		 2131 u8 guid[16];
2132
ad7f8a1f
DA		 2133 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2134 if (sret != DP_RECEIVER_CAP_SIZE) {
2135 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2136 ret = -1;
2137 goto out_unlock;
2138 }
2139
2140 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2141 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2142 if (ret < 0) {
2143 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2144 ret = -1;
2145 goto out_unlock;
2146 }
1652fce6
L		 2147
2148 /* Some hubs forget their guids after they resume */
2149 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2150 if (sret != 16) {
2151 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2152 ret = -1;
2153 goto out_unlock;
2154 }
2155 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2156
ad7f8a1f
DA		 2157 ret = 0;
2158 } else
2159 ret = -1;
2160
2161out_unlock:
2162 mutex_unlock(&mgr->lock);
2163 return ret;
2164}
2165EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2166
2167static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2168{
2169 int len;
2170 u8 replyblock[32];
2171 int replylen, origlen, curreply;
2172 int ret;
2173 struct drm_dp_sideband_msg_rx *msg;
2174 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2175 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2176
2177 len = min(mgr->max_dpcd_transaction_bytes, 16);
2178 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2179 replyblock, len);
2180 if (ret != len) {
2181 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2182 return;
2183 }
2184 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2185 if (!ret) {
2186 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2187 return;
2188 }
2189 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2190
2191 origlen = replylen;
2192 replylen -= len;
2193 curreply = len;
2194 while (replylen > 0) {
2195 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2196 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2197 replyblock, len);
2198 if (ret != len) {
2199 DRM_DEBUG_KMS("failed to read a chunk\n");
2200 }
2201 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2202 if (ret == false)
2203 DRM_DEBUG_KMS("failed to build sideband msg\n");
2204 curreply += len;
2205 replylen -= len;
2206 }
2207}
2208
2209static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2210{
2211 int ret = 0;
2212
2213 drm_dp_get_one_sb_msg(mgr, false);
2214
2215 if (mgr->down_rep_recv.have_eomt) {
2216 struct drm_dp_sideband_msg_tx *txmsg;
2217 struct drm_dp_mst_branch *mstb;
2218 int slot = -1;
2219 mstb = drm_dp_get_mst_branch_device(mgr,
2220 mgr->down_rep_recv.initial_hdr.lct,
2221 mgr->down_rep_recv.initial_hdr.rad);
2222
2223 if (!mstb) {
2224 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2225 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2226 return 0;
2227 }
2228
2229 /* find the message */
2230 slot = mgr->down_rep_recv.initial_hdr.seqno;
2231 mutex_lock(&mgr->qlock);
2232 txmsg = mstb->tx_slots[slot];
2233 /* remove from slots */
2234 mutex_unlock(&mgr->qlock);
2235
2236 if (!txmsg) {
2237 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2238 mstb,
2239 mgr->down_rep_recv.initial_hdr.seqno,
2240 mgr->down_rep_recv.initial_hdr.lct,
2241 mgr->down_rep_recv.initial_hdr.rad[0],
2242 mgr->down_rep_recv.msg[0]);
2243 drm_dp_put_mst_branch_device(mstb);
2244 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2245 return 0;
2246 }
2247
2248 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2249 if (txmsg->reply.reply_type == 1) {
2250 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);
2251 }
2252
2253 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2254 drm_dp_put_mst_branch_device(mstb);
2255
2256 mutex_lock(&mgr->qlock);
2257 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2258 mstb->tx_slots[slot] = NULL;
2259 mutex_unlock(&mgr->qlock);
2260
68e989dc 2261 wake_up_all(&mgr->tx_waitq);
ad7f8a1f
DA		 2262 }
2263 return ret;
2264}
2265
2266static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2267{
2268 int ret = 0;
2269 drm_dp_get_one_sb_msg(mgr, true);
2270
2271 if (mgr->up_req_recv.have_eomt) {
2272 struct drm_dp_sideband_msg_req_body msg;
bd934320 2273 struct drm_dp_mst_branch *mstb = NULL;
ad7f8a1f 2274 bool seqno;
bd934320
ML		 2275
2276 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2277 mstb = drm_dp_get_mst_branch_device(mgr,
2278 mgr->up_req_recv.initial_hdr.lct,
2279 mgr->up_req_recv.initial_hdr.rad);
2280 if (!mstb) {
2281 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2282 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2283 return 0;
2284 }
ad7f8a1f
DA		 2285 }
2286
2287 seqno = mgr->up_req_recv.initial_hdr.seqno;
2288 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2289
2290 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
bd934320
ML		 2291 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2292
2293 if (!mstb)
2294 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2295
2296 if (!mstb) {
2297 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2298 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2299 return 0;
2300 }
2301
ad7f8a1f 2302 drm_dp_update_port(mstb, &msg.u.conn_stat);
5e93b820 2303
ad7f8a1f 2304 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);
8ae22cb4
DA		 2305 (*mgr->cbs->hotplug)(mgr);
2306
ad7f8a1f 2307 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
bd934320
ML		 2308 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2309 if (!mstb)
2310 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2311
2312 if (!mstb) {
2313 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2314 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2315 return 0;
2316 }
2317
ad7f8a1f
DA		 2318 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2319 }
2320
2321 drm_dp_put_mst_branch_device(mstb);
2322 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2323 }
2324 return ret;
2325}
2326
2327/**
2328 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2329 * @mgr: manager to notify irq for.
2330 * @esi: 4 bytes from SINK_COUNT_ESI
295ee853 2331 * @handled: whether the hpd interrupt was consumed or not
ad7f8a1f
DA		 2332 *
2333 * This should be called from the driver when it detects a short IRQ,
2334 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2335 * topology manager will process the sideband messages received as a result
2336 * of this.
2337 */
2338int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2339{
2340 int ret = 0;
2341 int sc;
2342 *handled = false;
2343 sc = esi[0] & 0x3f;
2344
2345 if (sc != mgr->sink_count) {
2346 mgr->sink_count = sc;
2347 *handled = true;
2348 }
2349
2350 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2351 ret = drm_dp_mst_handle_down_rep(mgr);
2352 *handled = true;
2353 }
2354
2355 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2356 ret |= drm_dp_mst_handle_up_req(mgr);
2357 *handled = true;
2358 }
2359
2360 drm_dp_mst_kick_tx(mgr);
2361 return ret;
2362}
2363EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2364
2365/**
2366 * drm_dp_mst_detect_port() - get connection status for an MST port
132d49d7 2367 * @connector: DRM connector for this port
ad7f8a1f
DA		 2368 * @mgr: manager for this port
2369 * @port: unverified pointer to a port
2370 *
2371 * This returns the current connection state for a port. It validates the
2372 * port pointer still exists so the caller doesn't require a reference
2373 */
c6a0aed4
DA		 2374enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2375 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
ad7f8a1f
DA		 2376{
2377 enum drm_connector_status status = connector_status_disconnected;
2378
2379 /* we need to search for the port in the mgr in case its gone */
2380 port = drm_dp_get_validated_port_ref(mgr, port);
2381 if (!port)
2382 return connector_status_disconnected;
2383
2384 if (!port->ddps)
2385 goto out;
2386
2387 switch (port->pdt) {
2388 case DP_PEER_DEVICE_NONE:
2389 case DP_PEER_DEVICE_MST_BRANCHING:
2390 break;
2391
2392 case DP_PEER_DEVICE_SST_SINK:
2393 status = connector_status_connected;
8ae22cb4
DA		 2394 /* for logical ports - cache the EDID */
2395 if (port->port_num >= 8 && !port->cached_edid) {
2396 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2397 }
ad7f8a1f
DA		 2398 break;
2399 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2400 if (port->ldps)
2401 status = connector_status_connected;
2402 break;
2403 }
2404out:
2405 drm_dp_put_port(port);
2406 return status;
2407}
2408EXPORT_SYMBOL(drm_dp_mst_detect_port);
2409
ef8f9bea
LY		 2410/**
2411 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2412 * @mgr: manager for this port
2413 * @port: unverified pointer to a port.
2414 *
2415 * This returns whether the port supports audio or not.
2416 */
2417bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2418 struct drm_dp_mst_port *port)
2419{
2420 bool ret = false;
2421
2422 port = drm_dp_get_validated_port_ref(mgr, port);
2423 if (!port)
2424 return ret;
2425 ret = port->has_audio;
2426 drm_dp_put_port(port);
2427 return ret;
2428}
2429EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2430
ad7f8a1f
DA		 2431/**
2432 * drm_dp_mst_get_edid() - get EDID for an MST port
2433 * @connector: toplevel connector to get EDID for
2434 * @mgr: manager for this port
2435 * @port: unverified pointer to a port.
2436 *
2437 * This returns an EDID for the port connected to a connector,
2438 * It validates the pointer still exists so the caller doesn't require a
2439 * reference.
2440 */
2441struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2442{
2443 struct edid *edid = NULL;
2444
2445 /* we need to search for the port in the mgr in case its gone */
2446 port = drm_dp_get_validated_port_ref(mgr, port);
2447 if (!port)
2448 return NULL;
2449
c6a0aed4
DA		 2450 if (port->cached_edid)
2451 edid = drm_edid_duplicate(port->cached_edid);
8ae22cb4
DA		 2452 else {
2453 edid = drm_get_edid(connector, &port->aux.ddc);
2454 drm_mode_connector_set_tile_property(connector);
2455 }
ef8f9bea 2456 port->has_audio = drm_detect_monitor_audio(edid);
ad7f8a1f
DA		 2457 drm_dp_put_port(port);
2458 return edid;
2459}
2460EXPORT_SYMBOL(drm_dp_mst_get_edid);
2461
2462/**
2463 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2464 * @mgr: manager to use
2465 * @pbn: payload bandwidth to convert into slots.
2466 */
2467int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2468 int pbn)
2469{
2470 int num_slots;
2471
2472 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2473
feb2c3bc
PD		 2474 /* max. time slots - one slot for MTP header */
2475 if (num_slots > 63)
ad7f8a1f
DA		 2476 return -ENOSPC;
2477 return num_slots;
2478}
2479EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2480
2481static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
1e797f55 2482 struct drm_dp_vcpi *vcpi, int pbn, int slots)
ad7f8a1f 2483{
ad7f8a1f
DA		 2484 int ret;
2485
feb2c3bc 2486 /* max. time slots - one slot for MTP header */
1e797f55 2487 if (slots > 63)
ad7f8a1f
DA		 2488 return -ENOSPC;
2489
2490 vcpi->pbn = pbn;
1e797f55
PD		 2491 vcpi->aligned_pbn = slots * mgr->pbn_div;
2492 vcpi->num_slots = slots;
ad7f8a1f
DA		 2493
2494 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2495 if (ret < 0)
2496 return ret;
2497 return 0;
2498}
2499
edb1ed1a
PD		 2500/**
2501 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2502 * @state: global atomic state
2503 * @mgr: MST topology manager for the port
2504 * @port: port to find vcpi slots for
2505 * @pbn: bandwidth required for the mode in PBN
2506 *
2507 * RETURNS:
2508 * Total slots in the atomic state assigned for this port or error
2509 */
2510int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2511 struct drm_dp_mst_topology_mgr *mgr,
2512 struct drm_dp_mst_port *port, int pbn)
2513{
2514 struct drm_dp_mst_topology_state *topology_state;
2515 int req_slots;
2516
2517 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2518 if (topology_state == NULL)
2519 return -ENOMEM;
2520
2521 port = drm_dp_get_validated_port_ref(mgr, port);
2522 if (port == NULL)
2523 return -EINVAL;
2524 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2525 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2526 req_slots, topology_state->avail_slots);
2527
2528 if (req_slots > topology_state->avail_slots) {
2529 drm_dp_put_port(port);
2530 return -ENOSPC;
2531 }
2532
2533 topology_state->avail_slots -= req_slots;
2534 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2535
2536 drm_dp_put_port(port);
2537 return req_slots;
2538}
2539EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2540
2541/**
2542 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2543 * @state: global atomic state
2544 * @mgr: MST topology manager for the port
2545 * @slots: number of vcpi slots to release
2546 *
2547 * RETURNS:
2548 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2549 * negative error code
2550 */
2551int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2552 struct drm_dp_mst_topology_mgr *mgr,
2553 int slots)
2554{
2555 struct drm_dp_mst_topology_state *topology_state;
2556
2557 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2558 if (topology_state == NULL)
2559 return -ENOMEM;
2560
2561 /* We cannot rely on port->vcpi.num_slots to update
2562 * topology_state->avail_slots as the port may not exist if the parent
2563 * branch device was unplugged. This should be fixed by tracking
2564 * per-port slot allocation in drm_dp_mst_topology_state instead of
2565 * depending on the caller to tell us how many slots to release.
2566 */
2567 topology_state->avail_slots += slots;
2568 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2569 slots, topology_state->avail_slots);
2570
2571 return 0;
2572}
2573EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2574
ad7f8a1f
DA		 2575/**
2576 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2577 * @mgr: manager for this port
2578 * @port: port to allocate a virtual channel for.
2579 * @pbn: payload bandwidth number to request
2580 * @slots: returned number of slots for this PBN.
2581 */
1e797f55
PD		 2582bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2583 struct drm_dp_mst_port *port, int pbn, int slots)
ad7f8a1f
DA		 2584{
2585 int ret;
2586
2587 port = drm_dp_get_validated_port_ref(mgr, port);
2588 if (!port)
2589 return false;
2590
1e797f55
PD		 2591 if (slots < 0)
2592 return false;
2593
ad7f8a1f
DA		 2594 if (port->vcpi.vcpi > 0) {
2595 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2596 if (pbn == port->vcpi.pbn) {
dabe1954 2597 drm_dp_put_port(port);
ad7f8a1f
DA		 2598 return true;
2599 }
2600 }
2601
1e797f55 2602 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
ad7f8a1f 2603 if (ret) {
feb2c3bc
PD		 2604 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2605 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
ad7f8a1f
DA		 2606 goto out;
2607 }
feb2c3bc
PD		 2608 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2609 pbn, port->vcpi.num_slots);
ad7f8a1f
DA		 2610
2611 drm_dp_put_port(port);
2612 return true;
2613out:
2614 return false;
2615}
2616EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2617
87f5942d
DA		 2618int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2619{
2620 int slots = 0;
2621 port = drm_dp_get_validated_port_ref(mgr, port);
2622 if (!port)
2623 return slots;
2624
2625 slots = port->vcpi.num_slots;
2626 drm_dp_put_port(port);
2627 return slots;
2628}
2629EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2630
ad7f8a1f
DA		 2631/**
2632 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2633 * @mgr: manager for this port
2634 * @port: unverified pointer to a port.
2635 *
2636 * This just resets the number of slots for the ports VCPI for later programming.
2637 */
2638void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2639{
2640 port = drm_dp_get_validated_port_ref(mgr, port);
2641 if (!port)
2642 return;
2643 port->vcpi.num_slots = 0;
2644 drm_dp_put_port(port);
2645}
2646EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2647
2648/**
2649 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2650 * @mgr: manager for this port
2651 * @port: unverified port to deallocate vcpi for
2652 */
2653void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2654{
2655 port = drm_dp_get_validated_port_ref(mgr, port);
2656 if (!port)
2657 return;
2658
2659 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2660 port->vcpi.num_slots = 0;
2661 port->vcpi.pbn = 0;
2662 port->vcpi.aligned_pbn = 0;
2663 port->vcpi.vcpi = 0;
2664 drm_dp_put_port(port);
2665}
2666EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2667
2668static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2669 int id, struct drm_dp_payload *payload)
2670{
2671 u8 payload_alloc[3], status;
2672 int ret;
2673 int retries = 0;
2674
2675 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2676 DP_PAYLOAD_TABLE_UPDATED);
2677
2678 payload_alloc[0] = id;
2679 payload_alloc[1] = payload->start_slot;
2680 payload_alloc[2] = payload->num_slots;
2681
2682 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2683 if (ret != 3) {
2684 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2685 goto fail;
2686 }
2687
2688retry:
2689 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2690 if (ret < 0) {
2691 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2692 goto fail;
2693 }
2694
2695 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2696 retries++;
2697 if (retries < 20) {
2698 usleep_range(10000, 20000);
2699 goto retry;
2700 }
2701 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2702 ret = -EINVAL;
2703 goto fail;
2704 }
2705 ret = 0;
2706fail:
2707 return ret;
2708}
2709
2710
2711/**
2712 * drm_dp_check_act_status() - Check ACT handled status.
2713 * @mgr: manager to use
2714 *
2715 * Check the payload status bits in the DPCD for ACT handled completion.
2716 */
2717int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2718{
2719 u8 status;
2720 int ret;
2721 int count = 0;
2722
2723 do {
2724 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2725
2726 if (ret < 0) {
2727 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2728 goto fail;
2729 }
2730
2731 if (status & DP_PAYLOAD_ACT_HANDLED)
2732 break;
2733 count++;
2734 udelay(100);
2735
2736 } while (count < 30);
2737
2738 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2739 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2740 ret = -EINVAL;
2741 goto fail;
2742 }
2743 return 0;
2744fail:
2745 return ret;
2746}
2747EXPORT_SYMBOL(drm_dp_check_act_status);
2748
2749/**
2750 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2751 * @clock: dot clock for the mode
2752 * @bpp: bpp for the mode.
2753 *
2754 * This uses the formula in the spec to calculate the PBN value for a mode.
2755 */
2756int drm_dp_calc_pbn_mode(int clock, int bpp)
2757{
a9ebb3e4
HW		 2758 u64 kbps;
2759 s64 peak_kbps;
2760 u32 numerator;
2761 u32 denominator;
2762
2763 kbps = clock * bpp;
2764
2765 /*
2766 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2767 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2768 * common multiplier to render an integer PBN for all link rate/lane
2769 * counts combinations
2770 * calculate
2771 * peak_kbps *= (1006/1000)
2772 * peak_kbps *= (64/54)
2773 * peak_kbps *= 8 convert to bytes
2774 */
2775
2776 numerator = 64 * 1006;
2777 denominator = 54 * 8 * 1000 * 1000;
2778
2779 kbps *= numerator;
2780 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2781
2782 return drm_fixp2int_ceil(peak_kbps);
ad7f8a1f
DA		 2783}
2784EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2785
2786static int test_calc_pbn_mode(void)
2787{
2788 int ret;
2789 ret = drm_dp_calc_pbn_mode(154000, 30);
a9ebb3e4
HW		 2790 if (ret != 689) {
2791 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2792 154000, 30, 689, ret);
ad7f8a1f 2793 return -EINVAL;
a9ebb3e4 2794 }
ad7f8a1f 2795 ret = drm_dp_calc_pbn_mode(234000, 30);
a9ebb3e4
HW		 2796 if (ret != 1047) {
2797 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2798 234000, 30, 1047, ret);
ad7f8a1f 2799 return -EINVAL;
a9ebb3e4
HW		 2800 }
2801 ret = drm_dp_calc_pbn_mode(297000, 24);
2802 if (ret != 1063) {
2803 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2804 297000, 24, 1063, ret);
2805 return -EINVAL;
2806 }
ad7f8a1f
DA		 2807 return 0;
2808}
2809
2810/* we want to kick the TX after we've ack the up/down IRQs. */
2811static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2812{
2813 queue_work(system_long_wq, &mgr->tx_work);
2814}
2815
2816static void drm_dp_mst_dump_mstb(struct seq_file *m,
2817 struct drm_dp_mst_branch *mstb)
2818{
2819 struct drm_dp_mst_port *port;
2820 int tabs = mstb->lct;
2821 char prefix[10];
2822 int i;
2823
2824 for (i = 0; i < tabs; i++)
2825 prefix[i] = '\t';
2826 prefix[i] = '\0';
2827
2828 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2829 list_for_each_entry(port, &mstb->ports, next) {
51108f25 2830 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		 2831 if (port->mstb)
2832 drm_dp_mst_dump_mstb(m, port->mstb);
2833 }
2834}
2835
2836static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2837 char *buf)
2838{
2839 int ret;
2840 int i;
2841 for (i = 0; i < 4; i++) {
2842 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
2843 if (ret != 16)
2844 break;
2845 }
2846 if (i == 4)
2847 return true;
2848 return false;
2849}
2850
51108f25
JB		 2851static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2852 struct drm_dp_mst_port *port, char *name,
2853 int namelen)
2854{
2855 struct edid *mst_edid;
2856
2857 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2858 drm_edid_get_monitor_name(mst_edid, name, namelen);
2859}
2860
ad7f8a1f
DA		 2861/**
2862 * drm_dp_mst_dump_topology(): dump topology to seq file.
2863 * @m: seq_file to dump output to
2864 * @mgr: manager to dump current topology for.
2865 *
2866 * helper to dump MST topology to a seq file for debugfs.
2867 */
2868void drm_dp_mst_dump_topology(struct seq_file *m,
2869 struct drm_dp_mst_topology_mgr *mgr)
2870{
2871 int i;
2872 struct drm_dp_mst_port *port;
51108f25 2873
ad7f8a1f
DA		 2874 mutex_lock(&mgr->lock);
2875 if (mgr->mst_primary)
2876 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2877
2878 /* dump VCPIs */
2879 mutex_unlock(&mgr->lock);
2880
2881 mutex_lock(&mgr->payload_lock);
51108f25
JB		 2882 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2883 mgr->max_payloads);
ad7f8a1f
DA		 2884
2885 for (i = 0; i < mgr->max_payloads; i++) {
2886 if (mgr->proposed_vcpis[i]) {
51108f25
JB		 2887 char name[14];
2888
ad7f8a1f 2889 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
51108f25
JB		 2890 fetch_monitor_name(mgr, port, name, sizeof(name));
2891 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2892 port->port_num, port->vcpi.vcpi,
2893 port->vcpi.num_slots,
2894 (*name != 0) ? name : "Unknown");
ad7f8a1f 2895 } else
51108f25 2896 seq_printf(m, "vcpi %d:unused\n", i);
ad7f8a1f
DA		 2897 }
2898 for (i = 0; i < mgr->max_payloads; i++) {
2899 seq_printf(m, "payload %d: %d, %d, %d\n",
2900 i,
2901 mgr->payloads[i].payload_state,
2902 mgr->payloads[i].start_slot,
2903 mgr->payloads[i].num_slots);
2904
2905
2906 }
2907 mutex_unlock(&mgr->payload_lock);
2908
2909 mutex_lock(&mgr->lock);
2910 if (mgr->mst_primary) {
2911 u8 buf[64];
2912 bool bret;
2913 int ret;
2914 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2915 seq_printf(m, "dpcd: ");
2916 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
2917 seq_printf(m, "%02x ", buf[i]);
2918 seq_printf(m, "\n");
2919 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2920 seq_printf(m, "faux/mst: ");
2921 for (i = 0; i < 2; i++)
2922 seq_printf(m, "%02x ", buf[i]);
2923 seq_printf(m, "\n");
2924 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2925 seq_printf(m, "mst ctrl: ");
2926 for (i = 0; i < 1; i++)
2927 seq_printf(m, "%02x ", buf[i]);
2928 seq_printf(m, "\n");
2929
44790462
DA		 2930 /* dump the standard OUI branch header */
2931 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2932 seq_printf(m, "branch oui: ");
2933 for (i = 0; i < 0x3; i++)
2934 seq_printf(m, "%02x", buf[i]);
2935 seq_printf(m, " devid: ");
51108f25 2936 for (i = 0x3; i < 0x8 && buf[i]; i++)
44790462 2937 seq_printf(m, "%c", buf[i]);
51108f25 2938
44790462
DA		 2939 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2940 seq_printf(m, "\n");
ad7f8a1f
DA		 2941 bret = dump_dp_payload_table(mgr, buf);
2942 if (bret == true) {
2943 seq_printf(m, "payload table: ");
2944 for (i = 0; i < 63; i++)
2945 seq_printf(m, "%02x ", buf[i]);
2946 seq_printf(m, "\n");
2947 }
2948
2949 }
2950
2951 mutex_unlock(&mgr->lock);
2952
2953}
2954EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2955
2956static void drm_dp_tx_work(struct work_struct *work)
2957{
2958 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2959
2960 mutex_lock(&mgr->qlock);
cb021a3e 2961 if (!list_empty(&mgr->tx_msg_downq))
ad7f8a1f
DA		 2962 process_single_down_tx_qlock(mgr);
2963 mutex_unlock(&mgr->qlock);
2964}
2965
91a25e46
ML		 2966static void drm_dp_free_mst_port(struct kref *kref)
2967{
2968 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2969 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2970 kfree(port);
2971}
2972
6b8eeca6
DA		 2973static void drm_dp_destroy_connector_work(struct work_struct *work)
2974{
2975 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
4772ff03 2976 struct drm_dp_mst_port *port;
df4839fd 2977 bool send_hotplug = false;
6b8eeca6
DA		 2978 /*
2979 * Not a regular list traverse as we have to drop the destroy
2980 * connector lock before destroying the connector, to avoid AB->BA
2981 * ordering between this lock and the config mutex.
2982 */
2983 for (;;) {
2984 mutex_lock(&mgr->destroy_connector_lock);
4772ff03
ML		 2985 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2986 if (!port) {
6b8eeca6
DA		 2987 mutex_unlock(&mgr->destroy_connector_lock);
2988 break;
2989 }
4772ff03 2990 list_del(&port->next);
6b8eeca6
DA		 2991 mutex_unlock(&mgr->destroy_connector_lock);
2992
91a25e46
ML		 2993 kref_init(&port->kref);
2994 INIT_LIST_HEAD(&port->next);
2995
4772ff03
ML		 2996 mgr->cbs->destroy_connector(mgr, port->connector);
2997
2998 drm_dp_port_teardown_pdt(port, port->pdt);
36e3fa6a 2999 port->pdt = DP_PEER_DEVICE_NONE;
4772ff03 3000
91a25e46 3001 if (!port->input && port->vcpi.vcpi > 0) {
fd2d2bac
AG		 3002 drm_dp_mst_reset_vcpi_slots(mgr, port);
3003 drm_dp_update_payload_part1(mgr);
3004 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
91a25e46
ML		 3005 }
3006
3007 kref_put(&port->kref, drm_dp_free_mst_port);
df4839fd 3008 send_hotplug = true;
6b8eeca6 3009 }
df4839fd
DA		 3010 if (send_hotplug)
3011 (*mgr->cbs->hotplug)(mgr);
6b8eeca6
DA		 3012}
3013
3f3353b7
PD		 3014void *drm_dp_mst_duplicate_state(struct drm_atomic_state *state, void *obj)
3015{
3016 struct drm_dp_mst_topology_mgr *mgr = obj;
3017 struct drm_dp_mst_topology_state *new_mst_state;
3018
3019 if (WARN_ON(!mgr->state))
3020 return NULL;
3021
3022 new_mst_state = kmemdup(mgr->state, sizeof(*new_mst_state), GFP_KERNEL);
3023 if (new_mst_state)
3024 new_mst_state->state = state;
3025 return new_mst_state;
3026}
3027
3028void drm_dp_mst_swap_state(void *obj, void **obj_state_ptr)
3029{
3030 struct drm_dp_mst_topology_mgr *mgr = obj;
3031 struct drm_dp_mst_topology_state **topology_state_ptr;
3032
3033 topology_state_ptr = (struct drm_dp_mst_topology_state **)obj_state_ptr;
3034
3035 mgr->state->state = (*topology_state_ptr)->state;
3036 swap(*topology_state_ptr, mgr->state);
3037 mgr->state->state = NULL;
3038}
3039
3040void drm_dp_mst_destroy_state(void *obj_state)
3041{
3042 kfree(obj_state);
3043}
3044
3045static const struct drm_private_state_funcs mst_state_funcs = {
3046 .duplicate_state = drm_dp_mst_duplicate_state,
3047 .swap_state = drm_dp_mst_swap_state,
3048 .destroy_state = drm_dp_mst_destroy_state,
3049};
3050
3051/**
3052 * drm_atomic_get_mst_topology_state: get MST topology state
3053 *
3054 * @state: global atomic state
3055 * @mgr: MST topology manager, also the private object in this case
3056 *
3057 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3058 * state vtable so that the private object state returned is that of a MST
3059 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3060 * to care of the locking, so warn if don't hold the connection_mutex.
3061 *
3062 * RETURNS:
3063 *
3064 * The MST topology state or error pointer.
3065 */
3066struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3067 struct drm_dp_mst_topology_mgr *mgr)
3068{
3069 struct drm_device *dev = mgr->dev;
3070
3071 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
3072 return drm_atomic_get_private_obj_state(state, mgr,
3073 &mst_state_funcs);
3074}
3075EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3076
ad7f8a1f
DA		 3077/**
3078 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3079 * @mgr: manager struct to initialise
3080 * @dev: device providing this structure - for i2c addition.
3081 * @aux: DP helper aux channel to talk to this device
3082 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3083 * @max_payloads: maximum number of payloads this GPU can source
3084 * @conn_base_id: the connector object ID the MST device is connected to.
3085 *
3086 * Return 0 for success, or negative error code on failure
3087 */
3088int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
7b0a89a6 3089 struct drm_device *dev, struct drm_dp_aux *aux,
ad7f8a1f
DA		 3090 int max_dpcd_transaction_bytes,
3091 int max_payloads, int conn_base_id)
3092{
3093 mutex_init(&mgr->lock);
3094 mutex_init(&mgr->qlock);
3095 mutex_init(&mgr->payload_lock);
6b8eeca6 3096 mutex_init(&mgr->destroy_connector_lock);
ad7f8a1f 3097 INIT_LIST_HEAD(&mgr->tx_msg_downq);
6b8eeca6 3098 INIT_LIST_HEAD(&mgr->destroy_connector_list);
ad7f8a1f
DA		 3099 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3100 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
6b8eeca6 3101 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
ad7f8a1f
DA		 3102 init_waitqueue_head(&mgr->tx_waitq);
3103 mgr->dev = dev;
3104 mgr->aux = aux;
3105 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3106 mgr->max_payloads = max_payloads;
3107 mgr->conn_base_id = conn_base_id;
4d6a10da
ID		 3108 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3109 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3110 return -EINVAL;
ad7f8a1f
DA		 3111 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3112 if (!mgr->payloads)
3113 return -ENOMEM;
3114 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3115 if (!mgr->proposed_vcpis)
3116 return -ENOMEM;
3117 set_bit(0, &mgr->payload_mask);
441388a8
ID		 3118 if (test_calc_pbn_mode() < 0)
3119 DRM_ERROR("MST PBN self-test failed\n");
3120
3f3353b7
PD		 3121 mgr->state = kzalloc(sizeof(*mgr->state), GFP_KERNEL);
3122 if (mgr->state == NULL)
3123 return -ENOMEM;
3124 mgr->state->mgr = mgr;
3125
3126 /* max. time slots - one slot for MTP header */
3127 mgr->state->avail_slots = 63;
3128 mgr->funcs = &mst_state_funcs;
3129
ad7f8a1f
DA		 3130 return 0;
3131}
3132EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3133
3134/**
3135 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3136 * @mgr: manager to destroy
3137 */
3138void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3139{
274d8352 3140 flush_work(&mgr->work);
6b8eeca6 3141 flush_work(&mgr->destroy_connector_work);
ad7f8a1f
DA		 3142 mutex_lock(&mgr->payload_lock);
3143 kfree(mgr->payloads);
3144 mgr->payloads = NULL;
3145 kfree(mgr->proposed_vcpis);
3146 mgr->proposed_vcpis = NULL;
3147 mutex_unlock(&mgr->payload_lock);
3148 mgr->dev = NULL;
3149 mgr->aux = NULL;
3f3353b7
PD		 3150 kfree(mgr->state);
3151 mgr->state = NULL;
3152 mgr->funcs = NULL;
ad7f8a1f
DA		 3153}
3154EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3155
3156/* I2C device */
3157static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3158 int num)
3159{
3160 struct drm_dp_aux *aux = adapter->algo_data;
3161 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3162 struct drm_dp_mst_branch *mstb;
3163 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3164 unsigned int i;
3165 bool reading = false;
3166 struct drm_dp_sideband_msg_req_body msg;
3167 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3168 int ret;
3169
3170 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3171 if (!mstb)
3172 return -EREMOTEIO;
3173
3174 /* construct i2c msg */
3175 /* see if last msg is a read */
3176 if (msgs[num - 1].flags & I2C_M_RD)
3177 reading = true;
3178
ae491542 3179 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
ad7f8a1f
DA		 3180 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3181 ret = -EIO;
3182 goto out;
3183 }
3184
ae491542 3185 memset(&msg, 0, sizeof(msg));
ad7f8a1f
DA		 3186 msg.req_type = DP_REMOTE_I2C_READ;
3187 msg.u.i2c_read.num_transactions = num - 1;
3188 msg.u.i2c_read.port_number = port->port_num;
3189 for (i = 0; i < num - 1; i++) {
3190 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3191 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3192 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3193 }
3194 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3195 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3196
3197 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3198 if (!txmsg) {
3199 ret = -ENOMEM;
3200 goto out;
3201 }
3202
3203 txmsg->dst = mstb;
3204 drm_dp_encode_sideband_req(&msg, txmsg);
3205
3206 drm_dp_queue_down_tx(mgr, txmsg);
3207
3208 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3209 if (ret > 0) {
3210
3211 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3212 ret = -EREMOTEIO;
3213 goto out;
3214 }
3215 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3216 ret = -EIO;
3217 goto out;
3218 }
3219 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3220 ret = num;
3221 }
3222out:
3223 kfree(txmsg);
3224 drm_dp_put_mst_branch_device(mstb);
3225 return ret;
3226}
3227
3228static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3229{
3230 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3231 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3232 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3233 I2C_FUNC_10BIT_ADDR;
3234}
3235
3236static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3237 .functionality = drm_dp_mst_i2c_functionality,
3238 .master_xfer = drm_dp_mst_i2c_xfer,
3239};
3240
3241/**
3242 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3243 * @aux: DisplayPort AUX channel
3244 *
3245 * Returns 0 on success or a negative error code on failure.
3246 */
3247static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3248{
3249 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3250 aux->ddc.algo_data = aux;
3251 aux->ddc.retries = 3;
3252
3253 aux->ddc.class = I2C_CLASS_DDC;
3254 aux->ddc.owner = THIS_MODULE;
3255 aux->ddc.dev.parent = aux->dev;
3256 aux->ddc.dev.of_node = aux->dev->of_node;
3257
3258 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3259 sizeof(aux->ddc.name));
3260
3261 return i2c_add_adapter(&aux->ddc);
3262}
3263
3264/**
3265 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3266 * @aux: DisplayPort AUX channel
3267 */
3268static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3269{
3270 i2c_del_adapter(&aux->ddc);
3271}
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