Commit | Line | Data |
---|---|---|
1976dbca TR |
1 | /* |
2 | * Copyright (C) 2014 NVIDIA Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/backlight.h> | |
10 | #include <linux/gpio/consumer.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/regulator/consumer.h> | |
14 | ||
15 | #include <drm/drmP.h> | |
16 | #include <drm/drm_crtc.h> | |
17 | #include <drm/drm_mipi_dsi.h> | |
18 | #include <drm/drm_panel.h> | |
19 | ||
20 | #include <video/mipi_display.h> | |
21 | ||
1976dbca TR |
22 | struct sharp_panel { |
23 | struct drm_panel base; | |
24 | /* the datasheet refers to them as DSI-LINK1 and DSI-LINK2 */ | |
25 | struct mipi_dsi_device *link1; | |
26 | struct mipi_dsi_device *link2; | |
27 | ||
28 | struct backlight_device *backlight; | |
29 | struct regulator *supply; | |
30 | ||
31 | bool prepared; | |
32 | bool enabled; | |
33 | ||
34 | const struct drm_display_mode *mode; | |
35 | }; | |
36 | ||
37 | static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel) | |
38 | { | |
39 | return container_of(panel, struct sharp_panel, base); | |
40 | } | |
41 | ||
4569619d TR |
42 | static void sharp_wait_frames(struct sharp_panel *sharp, unsigned int frames) |
43 | { | |
44 | unsigned int refresh = drm_mode_vrefresh(sharp->mode); | |
45 | ||
46 | if (WARN_ON(frames > refresh)) | |
47 | return; | |
48 | ||
49 | msleep(1000 / (refresh / frames)); | |
50 | } | |
51 | ||
1976dbca TR |
52 | static int sharp_panel_write(struct sharp_panel *sharp, u16 offset, u8 value) |
53 | { | |
54 | u8 payload[3] = { offset >> 8, offset & 0xff, value }; | |
55 | struct mipi_dsi_device *dsi = sharp->link1; | |
56 | ssize_t err; | |
57 | ||
58 | err = mipi_dsi_generic_write(dsi, payload, sizeof(payload)); | |
59 | if (err < 0) { | |
60 | dev_err(&dsi->dev, "failed to write %02x to %04x: %zd\n", | |
61 | value, offset, err); | |
62 | return err; | |
63 | } | |
64 | ||
65 | err = mipi_dsi_dcs_nop(dsi); | |
66 | if (err < 0) { | |
67 | dev_err(&dsi->dev, "failed to send DCS nop: %zd\n", err); | |
68 | return err; | |
69 | } | |
70 | ||
71 | usleep_range(10, 20); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static __maybe_unused int sharp_panel_read(struct sharp_panel *sharp, | |
77 | u16 offset, u8 *value) | |
78 | { | |
79 | ssize_t err; | |
80 | ||
81 | cpu_to_be16s(&offset); | |
82 | ||
83 | err = mipi_dsi_generic_read(sharp->link1, &offset, sizeof(offset), | |
84 | value, sizeof(*value)); | |
85 | if (err < 0) | |
86 | dev_err(&sharp->link1->dev, "failed to read from %04x: %zd\n", | |
87 | offset, err); | |
88 | ||
89 | return err; | |
90 | } | |
91 | ||
92 | static int sharp_panel_disable(struct drm_panel *panel) | |
93 | { | |
94 | struct sharp_panel *sharp = to_sharp_panel(panel); | |
95 | ||
96 | if (!sharp->enabled) | |
97 | return 0; | |
98 | ||
99 | if (sharp->backlight) { | |
100 | sharp->backlight->props.power = FB_BLANK_POWERDOWN; | |
101 | backlight_update_status(sharp->backlight); | |
102 | } | |
103 | ||
104 | sharp->enabled = false; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int sharp_panel_unprepare(struct drm_panel *panel) | |
110 | { | |
111 | struct sharp_panel *sharp = to_sharp_panel(panel); | |
112 | int err; | |
113 | ||
114 | if (!sharp->prepared) | |
115 | return 0; | |
116 | ||
ee920bca TR |
117 | sharp_wait_frames(sharp, 4); |
118 | ||
1976dbca TR |
119 | err = mipi_dsi_dcs_set_display_off(sharp->link1); |
120 | if (err < 0) | |
121 | dev_err(panel->dev, "failed to set display off: %d\n", err); | |
122 | ||
123 | err = mipi_dsi_dcs_enter_sleep_mode(sharp->link1); | |
124 | if (err < 0) | |
125 | dev_err(panel->dev, "failed to enter sleep mode: %d\n", err); | |
126 | ||
127 | msleep(120); | |
128 | ||
129 | regulator_disable(sharp->supply); | |
130 | ||
131 | sharp->prepared = false; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static int sharp_setup_symmetrical_split(struct mipi_dsi_device *left, | |
137 | struct mipi_dsi_device *right, | |
138 | const struct drm_display_mode *mode) | |
139 | { | |
140 | int err; | |
141 | ||
142 | err = mipi_dsi_dcs_set_column_address(left, 0, mode->hdisplay / 2 - 1); | |
143 | if (err < 0) { | |
144 | dev_err(&left->dev, "failed to set column address: %d\n", err); | |
145 | return err; | |
146 | } | |
147 | ||
148 | err = mipi_dsi_dcs_set_page_address(left, 0, mode->vdisplay - 1); | |
149 | if (err < 0) { | |
150 | dev_err(&left->dev, "failed to set page address: %d\n", err); | |
151 | return err; | |
152 | } | |
153 | ||
154 | err = mipi_dsi_dcs_set_column_address(right, mode->hdisplay / 2, | |
155 | mode->hdisplay - 1); | |
156 | if (err < 0) { | |
157 | dev_err(&right->dev, "failed to set column address: %d\n", err); | |
158 | return err; | |
159 | } | |
160 | ||
161 | err = mipi_dsi_dcs_set_page_address(right, 0, mode->vdisplay - 1); | |
162 | if (err < 0) { | |
163 | dev_err(&right->dev, "failed to set page address: %d\n", err); | |
164 | return err; | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int sharp_panel_prepare(struct drm_panel *panel) | |
171 | { | |
172 | struct sharp_panel *sharp = to_sharp_panel(panel); | |
173 | u8 format = MIPI_DCS_PIXEL_FMT_24BIT; | |
174 | int err; | |
175 | ||
176 | if (sharp->prepared) | |
177 | return 0; | |
178 | ||
179 | err = regulator_enable(sharp->supply); | |
180 | if (err < 0) | |
181 | return err; | |
182 | ||
ee920bca TR |
183 | /* |
184 | * According to the datasheet, the panel needs around 10 ms to fully | |
185 | * power up. At least another 120 ms is required before exiting sleep | |
186 | * mode to make sure the panel is ready. Throw in another 20 ms for | |
187 | * good measure. | |
188 | */ | |
189 | msleep(150); | |
1976dbca TR |
190 | |
191 | err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1); | |
192 | if (err < 0) { | |
193 | dev_err(panel->dev, "failed to exit sleep mode: %d\n", err); | |
194 | goto poweroff; | |
195 | } | |
196 | ||
197 | /* | |
198 | * The MIPI DCS specification mandates this delay only between the | |
199 | * exit_sleep_mode and enter_sleep_mode commands, so it isn't strictly | |
200 | * necessary here. | |
201 | */ | |
202 | /* | |
203 | msleep(120); | |
204 | */ | |
205 | ||
206 | /* set left-right mode */ | |
207 | err = sharp_panel_write(sharp, 0x1000, 0x2a); | |
208 | if (err < 0) { | |
209 | dev_err(panel->dev, "failed to set left-right mode: %d\n", err); | |
210 | goto poweroff; | |
211 | } | |
212 | ||
213 | /* enable command mode */ | |
214 | err = sharp_panel_write(sharp, 0x1001, 0x01); | |
215 | if (err < 0) { | |
216 | dev_err(panel->dev, "failed to enable command mode: %d\n", err); | |
217 | goto poweroff; | |
218 | } | |
219 | ||
220 | err = mipi_dsi_dcs_set_pixel_format(sharp->link1, format); | |
221 | if (err < 0) { | |
222 | dev_err(panel->dev, "failed to set pixel format: %d\n", err); | |
223 | goto poweroff; | |
224 | } | |
225 | ||
226 | /* | |
227 | * TODO: The device supports both left-right and even-odd split | |
228 | * configurations, but this driver currently supports only the left- | |
229 | * right split. To support a different mode a mechanism needs to be | |
230 | * put in place to communicate the configuration back to the DSI host | |
231 | * controller. | |
232 | */ | |
233 | err = sharp_setup_symmetrical_split(sharp->link1, sharp->link2, | |
234 | sharp->mode); | |
235 | if (err < 0) { | |
236 | dev_err(panel->dev, "failed to set up symmetrical split: %d\n", | |
237 | err); | |
238 | goto poweroff; | |
239 | } | |
240 | ||
241 | err = mipi_dsi_dcs_set_display_on(sharp->link1); | |
242 | if (err < 0) { | |
243 | dev_err(panel->dev, "failed to set display on: %d\n", err); | |
244 | goto poweroff; | |
245 | } | |
246 | ||
247 | sharp->prepared = true; | |
248 | ||
4569619d TR |
249 | /* wait for 6 frames before continuing */ |
250 | sharp_wait_frames(sharp, 6); | |
251 | ||
1976dbca TR |
252 | return 0; |
253 | ||
254 | poweroff: | |
255 | regulator_disable(sharp->supply); | |
256 | return err; | |
257 | } | |
258 | ||
259 | static int sharp_panel_enable(struct drm_panel *panel) | |
260 | { | |
261 | struct sharp_panel *sharp = to_sharp_panel(panel); | |
262 | ||
263 | if (sharp->enabled) | |
264 | return 0; | |
265 | ||
266 | if (sharp->backlight) { | |
267 | sharp->backlight->props.power = FB_BLANK_UNBLANK; | |
268 | backlight_update_status(sharp->backlight); | |
269 | } | |
270 | ||
271 | sharp->enabled = true; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static const struct drm_display_mode default_mode = { | |
277 | .clock = 278000, | |
278 | .hdisplay = 2560, | |
279 | .hsync_start = 2560 + 128, | |
280 | .hsync_end = 2560 + 128 + 64, | |
281 | .htotal = 2560 + 128 + 64 + 64, | |
282 | .vdisplay = 1600, | |
283 | .vsync_start = 1600 + 4, | |
284 | .vsync_end = 1600 + 4 + 8, | |
285 | .vtotal = 1600 + 4 + 8 + 32, | |
286 | .vrefresh = 60, | |
287 | }; | |
288 | ||
289 | static int sharp_panel_get_modes(struct drm_panel *panel) | |
290 | { | |
291 | struct drm_display_mode *mode; | |
292 | ||
293 | mode = drm_mode_duplicate(panel->drm, &default_mode); | |
294 | if (!mode) { | |
295 | dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n", | |
296 | default_mode.hdisplay, default_mode.vdisplay, | |
297 | default_mode.vrefresh); | |
298 | return -ENOMEM; | |
299 | } | |
300 | ||
301 | drm_mode_set_name(mode); | |
302 | ||
303 | drm_mode_probed_add(panel->connector, mode); | |
304 | ||
305 | panel->connector->display_info.width_mm = 217; | |
306 | panel->connector->display_info.height_mm = 136; | |
307 | ||
308 | return 1; | |
309 | } | |
310 | ||
311 | static const struct drm_panel_funcs sharp_panel_funcs = { | |
312 | .disable = sharp_panel_disable, | |
313 | .unprepare = sharp_panel_unprepare, | |
314 | .prepare = sharp_panel_prepare, | |
315 | .enable = sharp_panel_enable, | |
316 | .get_modes = sharp_panel_get_modes, | |
317 | }; | |
318 | ||
319 | static const struct of_device_id sharp_of_match[] = { | |
320 | { .compatible = "sharp,lq101r1sx01", }, | |
321 | { } | |
322 | }; | |
323 | MODULE_DEVICE_TABLE(of, sharp_of_match); | |
324 | ||
325 | static int sharp_panel_add(struct sharp_panel *sharp) | |
326 | { | |
327 | struct device_node *np; | |
328 | int err; | |
329 | ||
330 | sharp->mode = &default_mode; | |
331 | ||
332 | sharp->supply = devm_regulator_get(&sharp->link1->dev, "power"); | |
333 | if (IS_ERR(sharp->supply)) | |
334 | return PTR_ERR(sharp->supply); | |
335 | ||
336 | np = of_parse_phandle(sharp->link1->dev.of_node, "backlight", 0); | |
337 | if (np) { | |
338 | sharp->backlight = of_find_backlight_by_node(np); | |
339 | of_node_put(np); | |
340 | ||
341 | if (!sharp->backlight) | |
342 | return -EPROBE_DEFER; | |
343 | } | |
344 | ||
345 | drm_panel_init(&sharp->base); | |
346 | sharp->base.funcs = &sharp_panel_funcs; | |
347 | sharp->base.dev = &sharp->link1->dev; | |
348 | ||
349 | err = drm_panel_add(&sharp->base); | |
350 | if (err < 0) | |
351 | goto put_backlight; | |
352 | ||
353 | return 0; | |
354 | ||
355 | put_backlight: | |
356 | if (sharp->backlight) | |
357 | put_device(&sharp->backlight->dev); | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | static void sharp_panel_del(struct sharp_panel *sharp) | |
363 | { | |
364 | if (sharp->base.dev) | |
365 | drm_panel_remove(&sharp->base); | |
366 | ||
367 | if (sharp->backlight) | |
368 | put_device(&sharp->backlight->dev); | |
369 | ||
370 | if (sharp->link2) | |
371 | put_device(&sharp->link2->dev); | |
372 | } | |
373 | ||
374 | static int sharp_panel_probe(struct mipi_dsi_device *dsi) | |
375 | { | |
376 | struct mipi_dsi_device *secondary = NULL; | |
377 | struct sharp_panel *sharp; | |
378 | struct device_node *np; | |
379 | int err; | |
380 | ||
381 | dsi->lanes = 4; | |
382 | dsi->format = MIPI_DSI_FMT_RGB888; | |
383 | dsi->mode_flags = MIPI_DSI_MODE_LPM; | |
384 | ||
385 | /* Find DSI-LINK1 */ | |
386 | np = of_parse_phandle(dsi->dev.of_node, "link2", 0); | |
387 | if (np) { | |
388 | secondary = of_find_mipi_dsi_device_by_node(np); | |
389 | of_node_put(np); | |
390 | ||
391 | if (!secondary) | |
392 | return -EPROBE_DEFER; | |
393 | } | |
394 | ||
395 | /* register a panel for only the DSI-LINK1 interface */ | |
396 | if (secondary) { | |
397 | sharp = devm_kzalloc(&dsi->dev, sizeof(*sharp), GFP_KERNEL); | |
398 | if (!sharp) { | |
399 | put_device(&secondary->dev); | |
400 | return -ENOMEM; | |
401 | } | |
402 | ||
403 | mipi_dsi_set_drvdata(dsi, sharp); | |
404 | ||
405 | sharp->link2 = secondary; | |
406 | sharp->link1 = dsi; | |
407 | ||
408 | err = sharp_panel_add(sharp); | |
409 | if (err < 0) { | |
410 | put_device(&secondary->dev); | |
411 | return err; | |
412 | } | |
413 | } | |
414 | ||
415 | err = mipi_dsi_attach(dsi); | |
416 | if (err < 0) { | |
417 | if (secondary) | |
418 | sharp_panel_del(sharp); | |
419 | ||
420 | return err; | |
421 | } | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static int sharp_panel_remove(struct mipi_dsi_device *dsi) | |
427 | { | |
428 | struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi); | |
429 | int err; | |
430 | ||
431 | /* only detach from host for the DSI-LINK2 interface */ | |
432 | if (!sharp) { | |
433 | mipi_dsi_detach(dsi); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | err = sharp_panel_disable(&sharp->base); | |
438 | if (err < 0) | |
439 | dev_err(&dsi->dev, "failed to disable panel: %d\n", err); | |
440 | ||
441 | err = mipi_dsi_detach(dsi); | |
442 | if (err < 0) | |
443 | dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err); | |
444 | ||
445 | drm_panel_detach(&sharp->base); | |
446 | sharp_panel_del(sharp); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | static void sharp_panel_shutdown(struct mipi_dsi_device *dsi) | |
452 | { | |
453 | struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi); | |
454 | ||
455 | /* nothing to do for DSI-LINK2 */ | |
456 | if (!sharp) | |
457 | return; | |
458 | ||
459 | sharp_panel_disable(&sharp->base); | |
460 | } | |
461 | ||
462 | static struct mipi_dsi_driver sharp_panel_driver = { | |
463 | .driver = { | |
464 | .name = "panel-sharp-lq101r1sx01", | |
465 | .of_match_table = sharp_of_match, | |
466 | }, | |
467 | .probe = sharp_panel_probe, | |
468 | .remove = sharp_panel_remove, | |
469 | .shutdown = sharp_panel_shutdown, | |
470 | }; | |
471 | module_mipi_dsi_driver(sharp_panel_driver); | |
472 | ||
473 | MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); | |
474 | MODULE_DESCRIPTION("Sharp LQ101R1SX01 panel driver"); | |
475 | MODULE_LICENSE("GPL v2"); |