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a9fe713d SP |
1 | /* |
2 | * NXP PTN3460 DP/LVDS bridge driver | |
3 | * | |
4 | * Copyright (C) 2013 Google, Inc. | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
94d50d57 AK |
16 | #include <linux/delay.h> |
17 | #include <linux/gpio.h> | |
18 | #include <linux/i2c.h> | |
a9fe713d SP |
19 | #include <linux/module.h> |
20 | #include <linux/of.h> | |
21 | #include <linux/of_gpio.h> | |
5bbb9a2e AK |
22 | #include <linux/of_graph.h> |
23 | ||
24 | #include <drm/drm_panel.h> | |
a9fe713d | 25 | |
94d50d57 AK |
26 | #include "bridge/ptn3460.h" |
27 | ||
a9fe713d SP |
28 | #include "drm_crtc.h" |
29 | #include "drm_crtc_helper.h" | |
94d50d57 AK |
30 | #include "drm_edid.h" |
31 | #include "drmP.h" | |
a9fe713d SP |
32 | |
33 | #define PTN3460_EDID_ADDR 0x0 | |
34 | #define PTN3460_EDID_EMULATION_ADDR 0x84 | |
35 | #define PTN3460_EDID_ENABLE_EMULATION 0 | |
36 | #define PTN3460_EDID_EMULATION_SELECTION 1 | |
37 | #define PTN3460_EDID_SRAM_LOAD_ADDR 0x85 | |
38 | ||
39 | struct ptn3460_bridge { | |
40 | struct drm_connector connector; | |
41 | struct i2c_client *client; | |
94d50d57 | 42 | struct drm_bridge bridge; |
a9fe713d | 43 | struct edid *edid; |
5bbb9a2e | 44 | struct drm_panel *panel; |
a9fe713d SP |
45 | int gpio_pd_n; |
46 | int gpio_rst_n; | |
47 | u32 edid_emulation; | |
48 | bool enabled; | |
49 | }; | |
50 | ||
94d50d57 AK |
51 | static inline struct ptn3460_bridge * |
52 | bridge_to_ptn3460(struct drm_bridge *bridge) | |
53 | { | |
54 | return container_of(bridge, struct ptn3460_bridge, bridge); | |
55 | } | |
56 | ||
57 | static inline struct ptn3460_bridge * | |
58 | connector_to_ptn3460(struct drm_connector *connector) | |
59 | { | |
60 | return container_of(connector, struct ptn3460_bridge, connector); | |
61 | } | |
62 | ||
a9fe713d SP |
63 | static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr, |
64 | u8 *buf, int len) | |
65 | { | |
66 | int ret; | |
67 | ||
68 | ret = i2c_master_send(ptn_bridge->client, &addr, 1); | |
69 | if (ret <= 0) { | |
70 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
71 | return ret; | |
72 | } | |
73 | ||
74 | ret = i2c_master_recv(ptn_bridge->client, buf, len); | |
75 | if (ret <= 0) { | |
76 | DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret); | |
77 | return ret; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr, | |
84 | char val) | |
85 | { | |
86 | int ret; | |
87 | char buf[2]; | |
88 | ||
89 | buf[0] = addr; | |
90 | buf[1] = val; | |
91 | ||
92 | ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf)); | |
93 | if (ret <= 0) { | |
94 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge) | |
102 | { | |
103 | int ret; | |
104 | char val; | |
105 | ||
106 | /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */ | |
107 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR, | |
108 | ptn_bridge->edid_emulation); | |
109 | if (ret) { | |
94d50d57 | 110 | DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret); |
a9fe713d SP |
111 | return ret; |
112 | } | |
113 | ||
114 | /* Enable EDID emulation and select the desired EDID */ | |
115 | val = 1 << PTN3460_EDID_ENABLE_EMULATION | | |
116 | ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION; | |
117 | ||
118 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val); | |
119 | if (ret) { | |
94d50d57 | 120 | DRM_ERROR("Failed to write EDID value, ret=%d\n", ret); |
a9fe713d SP |
121 | return ret; |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static void ptn3460_pre_enable(struct drm_bridge *bridge) | |
128 | { | |
94d50d57 | 129 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d SP |
130 | int ret; |
131 | ||
132 | if (ptn_bridge->enabled) | |
133 | return; | |
134 | ||
135 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
136 | gpio_set_value(ptn_bridge->gpio_pd_n, 1); | |
137 | ||
138 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) { | |
139 | gpio_set_value(ptn_bridge->gpio_rst_n, 0); | |
94d50d57 | 140 | usleep_range(10, 20); |
a9fe713d SP |
141 | gpio_set_value(ptn_bridge->gpio_rst_n, 1); |
142 | } | |
143 | ||
5bbb9a2e AK |
144 | if (drm_panel_prepare(ptn_bridge->panel)) { |
145 | DRM_ERROR("failed to prepare panel\n"); | |
146 | return; | |
147 | } | |
148 | ||
a9fe713d SP |
149 | /* |
150 | * There's a bug in the PTN chip where it falsely asserts hotplug before | |
151 | * it is fully functional. We're forced to wait for the maximum start up | |
152 | * time specified in the chip's datasheet to make sure we're really up. | |
153 | */ | |
154 | msleep(90); | |
155 | ||
156 | ret = ptn3460_select_edid(ptn_bridge); | |
157 | if (ret) | |
94d50d57 | 158 | DRM_ERROR("Select EDID failed ret=%d\n", ret); |
a9fe713d SP |
159 | |
160 | ptn_bridge->enabled = true; | |
161 | } | |
162 | ||
163 | static void ptn3460_enable(struct drm_bridge *bridge) | |
164 | { | |
5bbb9a2e AK |
165 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
166 | ||
167 | if (drm_panel_enable(ptn_bridge->panel)) { | |
168 | DRM_ERROR("failed to enable panel\n"); | |
169 | return; | |
170 | } | |
a9fe713d SP |
171 | } |
172 | ||
173 | static void ptn3460_disable(struct drm_bridge *bridge) | |
174 | { | |
94d50d57 | 175 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d SP |
176 | |
177 | if (!ptn_bridge->enabled) | |
178 | return; | |
179 | ||
180 | ptn_bridge->enabled = false; | |
181 | ||
5bbb9a2e AK |
182 | if (drm_panel_disable(ptn_bridge->panel)) { |
183 | DRM_ERROR("failed to disable panel\n"); | |
184 | return; | |
185 | } | |
186 | ||
a9fe713d SP |
187 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) |
188 | gpio_set_value(ptn_bridge->gpio_rst_n, 1); | |
189 | ||
190 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
191 | gpio_set_value(ptn_bridge->gpio_pd_n, 0); | |
192 | } | |
193 | ||
194 | static void ptn3460_post_disable(struct drm_bridge *bridge) | |
195 | { | |
5bbb9a2e AK |
196 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
197 | ||
198 | if (drm_panel_unprepare(ptn_bridge->panel)) { | |
199 | DRM_ERROR("failed to unprepare panel\n"); | |
200 | return; | |
201 | } | |
a9fe713d SP |
202 | } |
203 | ||
94d50d57 | 204 | static int ptn3460_get_modes(struct drm_connector *connector) |
a9fe713d SP |
205 | { |
206 | struct ptn3460_bridge *ptn_bridge; | |
207 | u8 *edid; | |
94d50d57 | 208 | int ret, num_modes = 0; |
a9fe713d SP |
209 | bool power_off; |
210 | ||
94d50d57 | 211 | ptn_bridge = connector_to_ptn3460(connector); |
a9fe713d SP |
212 | |
213 | if (ptn_bridge->edid) | |
214 | return drm_add_edid_modes(connector, ptn_bridge->edid); | |
215 | ||
216 | power_off = !ptn_bridge->enabled; | |
94d50d57 | 217 | ptn3460_pre_enable(&ptn_bridge->bridge); |
a9fe713d SP |
218 | |
219 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); | |
220 | if (!edid) { | |
94d50d57 | 221 | DRM_ERROR("Failed to allocate EDID\n"); |
a9fe713d SP |
222 | return 0; |
223 | } | |
224 | ||
225 | ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid, | |
226 | EDID_LENGTH); | |
227 | if (ret) { | |
228 | kfree(edid); | |
a9fe713d SP |
229 | goto out; |
230 | } | |
231 | ||
232 | ptn_bridge->edid = (struct edid *)edid; | |
233 | drm_mode_connector_update_edid_property(connector, ptn_bridge->edid); | |
234 | ||
235 | num_modes = drm_add_edid_modes(connector, ptn_bridge->edid); | |
236 | ||
237 | out: | |
238 | if (power_off) | |
94d50d57 | 239 | ptn3460_disable(&ptn_bridge->bridge); |
a9fe713d SP |
240 | |
241 | return num_modes; | |
242 | } | |
243 | ||
94d50d57 | 244 | static struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector) |
a9fe713d | 245 | { |
94d50d57 | 246 | struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector); |
a9fe713d | 247 | |
6a1688ae | 248 | return ptn_bridge->bridge.encoder; |
a9fe713d SP |
249 | } |
250 | ||
94d50d57 | 251 | static struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = { |
a9fe713d | 252 | .get_modes = ptn3460_get_modes, |
a9fe713d SP |
253 | .best_encoder = ptn3460_best_encoder, |
254 | }; | |
255 | ||
94d50d57 | 256 | static enum drm_connector_status ptn3460_detect(struct drm_connector *connector, |
a9fe713d SP |
257 | bool force) |
258 | { | |
259 | return connector_status_connected; | |
260 | } | |
261 | ||
94d50d57 | 262 | static void ptn3460_connector_destroy(struct drm_connector *connector) |
a9fe713d SP |
263 | { |
264 | drm_connector_cleanup(connector); | |
265 | } | |
266 | ||
94d50d57 | 267 | static struct drm_connector_funcs ptn3460_connector_funcs = { |
a9fe713d SP |
268 | .dpms = drm_helper_connector_dpms, |
269 | .fill_modes = drm_helper_probe_single_connector_modes, | |
270 | .detect = ptn3460_detect, | |
271 | .destroy = ptn3460_connector_destroy, | |
272 | }; | |
273 | ||
6a1688ae | 274 | int ptn3460_bridge_attach(struct drm_bridge *bridge) |
a9fe713d | 275 | { |
6a1688ae | 276 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d | 277 | int ret; |
6a1688ae AK |
278 | |
279 | if (!bridge->encoder) { | |
280 | DRM_ERROR("Parent encoder object not found"); | |
281 | return -ENODEV; | |
282 | } | |
283 | ||
284 | ret = drm_connector_init(bridge->dev, &ptn_bridge->connector, | |
285 | &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS); | |
286 | if (ret) { | |
287 | DRM_ERROR("Failed to initialize connector with drm\n"); | |
288 | return ret; | |
289 | } | |
290 | drm_connector_helper_add(&ptn_bridge->connector, | |
291 | &ptn3460_connector_helper_funcs); | |
292 | drm_connector_register(&ptn_bridge->connector); | |
293 | drm_mode_connector_attach_encoder(&ptn_bridge->connector, | |
294 | bridge->encoder); | |
295 | ||
5bbb9a2e AK |
296 | if (ptn_bridge->panel) |
297 | drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector); | |
298 | ||
6a1688ae AK |
299 | return ret; |
300 | } | |
301 | ||
302 | static struct drm_bridge_funcs ptn3460_bridge_funcs = { | |
303 | .pre_enable = ptn3460_pre_enable, | |
304 | .enable = ptn3460_enable, | |
305 | .disable = ptn3460_disable, | |
306 | .post_disable = ptn3460_post_disable, | |
307 | .attach = ptn3460_bridge_attach, | |
308 | }; | |
309 | ||
310 | static int ptn3460_probe(struct i2c_client *client, | |
311 | const struct i2c_device_id *id) | |
312 | { | |
313 | struct device *dev = &client->dev; | |
a9fe713d | 314 | struct ptn3460_bridge *ptn_bridge; |
5bbb9a2e | 315 | struct device_node *endpoint, *panel_node; |
6a1688ae | 316 | int ret; |
a9fe713d | 317 | |
6a1688ae | 318 | ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL); |
a9fe713d | 319 | if (!ptn_bridge) { |
a9fe713d SP |
320 | return -ENOMEM; |
321 | } | |
322 | ||
5bbb9a2e AK |
323 | endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); |
324 | if (endpoint) { | |
325 | panel_node = of_graph_get_remote_port_parent(endpoint); | |
326 | if (panel_node) { | |
327 | ptn_bridge->panel = of_drm_find_panel(panel_node); | |
328 | of_node_put(panel_node); | |
329 | if (!ptn_bridge->panel) | |
330 | return -EPROBE_DEFER; | |
331 | } | |
332 | } | |
333 | ||
a9fe713d | 334 | ptn_bridge->client = client; |
6a1688ae AK |
335 | ptn_bridge->gpio_pd_n = of_get_named_gpio(dev->of_node, |
336 | "powerdown-gpio", 0); | |
a9fe713d SP |
337 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) { |
338 | ret = gpio_request_one(ptn_bridge->gpio_pd_n, | |
339 | GPIOF_OUT_INIT_HIGH, "PTN3460_PD_N"); | |
340 | if (ret) { | |
6a1688ae AK |
341 | dev_err(dev, "Request powerdown-gpio failed (%d)\n", |
342 | ret); | |
a9fe713d SP |
343 | return ret; |
344 | } | |
345 | } | |
346 | ||
6a1688ae AK |
347 | ptn_bridge->gpio_rst_n = of_get_named_gpio(dev->of_node, |
348 | "reset-gpio", 0); | |
a9fe713d SP |
349 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) { |
350 | /* | |
351 | * Request the reset pin low to avoid the bridge being | |
352 | * initialized prematurely | |
353 | */ | |
354 | ret = gpio_request_one(ptn_bridge->gpio_rst_n, | |
355 | GPIOF_OUT_INIT_LOW, "PTN3460_RST_N"); | |
356 | if (ret) { | |
6a1688ae | 357 | dev_err(dev, "Request reset-gpio failed (%d)\n", ret); |
a9fe713d SP |
358 | gpio_free(ptn_bridge->gpio_pd_n); |
359 | return ret; | |
360 | } | |
361 | } | |
362 | ||
6a1688ae | 363 | ret = of_property_read_u32(dev->of_node, "edid-emulation", |
a9fe713d SP |
364 | &ptn_bridge->edid_emulation); |
365 | if (ret) { | |
6a1688ae | 366 | dev_err(dev, "Can't read EDID emulation value\n"); |
a9fe713d SP |
367 | goto err; |
368 | } | |
369 | ||
b07b90fd | 370 | ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs; |
5bbb9a2e | 371 | ptn_bridge->bridge.of_node = dev->of_node; |
6a1688ae | 372 | ret = drm_bridge_add(&ptn_bridge->bridge); |
a9fe713d | 373 | if (ret) { |
6a1688ae | 374 | DRM_ERROR("Failed to add bridge\n"); |
a9fe713d SP |
375 | goto err; |
376 | } | |
377 | ||
6a1688ae | 378 | i2c_set_clientdata(client, ptn_bridge); |
a9fe713d SP |
379 | |
380 | return 0; | |
381 | ||
382 | err: | |
383 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
384 | gpio_free(ptn_bridge->gpio_pd_n); | |
385 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) | |
386 | gpio_free(ptn_bridge->gpio_rst_n); | |
387 | return ret; | |
388 | } | |
3d3f8b1f | 389 | |
6a1688ae | 390 | static int ptn3460_remove(struct i2c_client *client) |
3d3f8b1f | 391 | { |
6a1688ae AK |
392 | struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client); |
393 | ||
394 | drm_bridge_remove(&ptn_bridge->bridge); | |
3d3f8b1f AK |
395 | |
396 | if (gpio_is_valid(ptn_bridge->gpio_pd_n)) | |
397 | gpio_free(ptn_bridge->gpio_pd_n); | |
398 | if (gpio_is_valid(ptn_bridge->gpio_rst_n)) | |
399 | gpio_free(ptn_bridge->gpio_rst_n); | |
6a1688ae AK |
400 | |
401 | return 0; | |
3d3f8b1f | 402 | } |
6a1688ae AK |
403 | |
404 | static const struct i2c_device_id ptn3460_i2c_table[] = { | |
405 | {"nxp,ptn3460", 0}, | |
406 | {}, | |
407 | }; | |
408 | MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table); | |
409 | ||
410 | static const struct of_device_id ptn3460_match[] = { | |
411 | { .compatible = "nxp,ptn3460" }, | |
412 | {}, | |
413 | }; | |
414 | MODULE_DEVICE_TABLE(of, ptn3460_match); | |
415 | ||
416 | static struct i2c_driver ptn3460_driver = { | |
417 | .id_table = ptn3460_i2c_table, | |
418 | .probe = ptn3460_probe, | |
419 | .remove = ptn3460_remove, | |
420 | .driver = { | |
421 | .name = "nxp,ptn3460", | |
422 | .owner = THIS_MODULE, | |
423 | .of_match_table = ptn3460_match, | |
424 | }, | |
425 | }; | |
426 | module_i2c_driver(ptn3460_driver); | |
427 | ||
428 | MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>"); | |
429 | MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver"); | |
430 | MODULE_LICENSE("GPL v2"); |