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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
4 *
5 * base on panel-kingdisplay-kd097d04.c
6 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
7 */
8
9#include <linux/backlight.h>
10#include <linux/delay.h>
11#include <linux/gpio/consumer.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/regulator/consumer.h>
15
16#include <video/mipi_display.h>
17
18#include <drm/drm_crtc.h>
19#include <drm/drm_device.h>
20#include <drm/drm_mipi_dsi.h>
21#include <drm/drm_modes.h>
22#include <drm/drm_panel.h>
23#include <drm/drm_print.h>
24
25struct ltk500hd1829 {
26 struct device *dev;
27 struct drm_panel panel;
28 struct gpio_desc *reset_gpio;
29 struct regulator *vcc;
30 struct regulator *iovcc;
31 bool prepared;
32};
33
34struct ltk500hd1829_cmd {
35 char cmd;
36 char data;
37};
38
39/*
40 * There is no description in the Reference Manual about these commands.
41 * We received them from the vendor, so just use them as is.
42 */
43static const struct ltk500hd1829_cmd init_code[] = {
44 { 0xE0, 0x00 },
45 { 0xE1, 0x93 },
46 { 0xE2, 0x65 },
47 { 0xE3, 0xF8 },
48 { 0x80, 0x03 },
49 { 0xE0, 0x04 },
50 { 0x2D, 0x03 },
51 { 0xE0, 0x01 },
52 { 0x00, 0x00 },
53 { 0x01, 0xB6 },
54 { 0x03, 0x00 },
55 { 0x04, 0xC5 },
56 { 0x17, 0x00 },
57 { 0x18, 0xBF },
58 { 0x19, 0x01 },
59 { 0x1A, 0x00 },
60 { 0x1B, 0xBF },
61 { 0x1C, 0x01 },
62 { 0x1F, 0x7C },
63 { 0x20, 0x26 },
64 { 0x21, 0x26 },
65 { 0x22, 0x4E },
66 { 0x37, 0x09 },
67 { 0x38, 0x04 },
68 { 0x39, 0x08 },
69 { 0x3A, 0x1F },
70 { 0x3B, 0x1F },
71 { 0x3C, 0x78 },
72 { 0x3D, 0xFF },
73 { 0x3E, 0xFF },
74 { 0x3F, 0x00 },
75 { 0x40, 0x04 },
76 { 0x41, 0xA0 },
77 { 0x43, 0x0F },
78 { 0x44, 0x0A },
79 { 0x45, 0x24 },
80 { 0x55, 0x01 },
81 { 0x56, 0x01 },
82 { 0x57, 0xA5 },
83 { 0x58, 0x0A },
84 { 0x59, 0x4A },
85 { 0x5A, 0x38 },
86 { 0x5B, 0x10 },
87 { 0x5C, 0x19 },
88 { 0x5D, 0x7C },
89 { 0x5E, 0x64 },
90 { 0x5F, 0x54 },
91 { 0x60, 0x48 },
92 { 0x61, 0x44 },
93 { 0x62, 0x35 },
94 { 0x63, 0x3A },
95 { 0x64, 0x24 },
96 { 0x65, 0x3B },
97 { 0x66, 0x39 },
98 { 0x67, 0x37 },
99 { 0x68, 0x56 },
100 { 0x69, 0x41 },
101 { 0x6A, 0x47 },
102 { 0x6B, 0x2F },
103 { 0x6C, 0x23 },
104 { 0x6D, 0x13 },
105 { 0x6E, 0x02 },
106 { 0x6F, 0x08 },
107 { 0x70, 0x7C },
108 { 0x71, 0x64 },
109 { 0x72, 0x54 },
110 { 0x73, 0x48 },
111 { 0x74, 0x44 },
112 { 0x75, 0x35 },
113 { 0x76, 0x3A },
114 { 0x77, 0x22 },
115 { 0x78, 0x3B },
116 { 0x79, 0x39 },
117 { 0x7A, 0x38 },
118 { 0x7B, 0x52 },
119 { 0x7C, 0x41 },
120 { 0x7D, 0x47 },
121 { 0x7E, 0x2F },
122 { 0x7F, 0x23 },
123 { 0x80, 0x13 },
124 { 0x81, 0x02 },
125 { 0x82, 0x08 },
126 { 0xE0, 0x02 },
127 { 0x00, 0x57 },
128 { 0x01, 0x77 },
129 { 0x02, 0x44 },
130 { 0x03, 0x46 },
131 { 0x04, 0x48 },
132 { 0x05, 0x4A },
133 { 0x06, 0x4C },
134 { 0x07, 0x4E },
135 { 0x08, 0x50 },
136 { 0x09, 0x55 },
137 { 0x0A, 0x52 },
138 { 0x0B, 0x55 },
139 { 0x0C, 0x55 },
140 { 0x0D, 0x55 },
141 { 0x0E, 0x55 },
142 { 0x0F, 0x55 },
143 { 0x10, 0x55 },
144 { 0x11, 0x55 },
145 { 0x12, 0x55 },
146 { 0x13, 0x40 },
147 { 0x14, 0x55 },
148 { 0x15, 0x55 },
149 { 0x16, 0x57 },
150 { 0x17, 0x77 },
151 { 0x18, 0x45 },
152 { 0x19, 0x47 },
153 { 0x1A, 0x49 },
154 { 0x1B, 0x4B },
155 { 0x1C, 0x4D },
156 { 0x1D, 0x4F },
157 { 0x1E, 0x51 },
158 { 0x1F, 0x55 },
159 { 0x20, 0x53 },
160 { 0x21, 0x55 },
161 { 0x22, 0x55 },
162 { 0x23, 0x55 },
163 { 0x24, 0x55 },
164 { 0x25, 0x55 },
165 { 0x26, 0x55 },
166 { 0x27, 0x55 },
167 { 0x28, 0x55 },
168 { 0x29, 0x41 },
169 { 0x2A, 0x55 },
170 { 0x2B, 0x55 },
171 { 0x2C, 0x57 },
172 { 0x2D, 0x77 },
173 { 0x2E, 0x4F },
174 { 0x2F, 0x4D },
175 { 0x30, 0x4B },
176 { 0x31, 0x49 },
177 { 0x32, 0x47 },
178 { 0x33, 0x45 },
179 { 0x34, 0x41 },
180 { 0x35, 0x55 },
181 { 0x36, 0x53 },
182 { 0x37, 0x55 },
183 { 0x38, 0x55 },
184 { 0x39, 0x55 },
185 { 0x3A, 0x55 },
186 { 0x3B, 0x55 },
187 { 0x3C, 0x55 },
188 { 0x3D, 0x55 },
189 { 0x3E, 0x55 },
190 { 0x3F, 0x51 },
191 { 0x40, 0x55 },
192 { 0x41, 0x55 },
193 { 0x42, 0x57 },
194 { 0x43, 0x77 },
195 { 0x44, 0x4E },
196 { 0x45, 0x4C },
197 { 0x46, 0x4A },
198 { 0x47, 0x48 },
199 { 0x48, 0x46 },
200 { 0x49, 0x44 },
201 { 0x4A, 0x40 },
202 { 0x4B, 0x55 },
203 { 0x4C, 0x52 },
204 { 0x4D, 0x55 },
205 { 0x4E, 0x55 },
206 { 0x4F, 0x55 },
207 { 0x50, 0x55 },
208 { 0x51, 0x55 },
209 { 0x52, 0x55 },
210 { 0x53, 0x55 },
211 { 0x54, 0x55 },
212 { 0x55, 0x50 },
213 { 0x56, 0x55 },
214 { 0x57, 0x55 },
215 { 0x58, 0x40 },
216 { 0x59, 0x00 },
217 { 0x5A, 0x00 },
218 { 0x5B, 0x10 },
219 { 0x5C, 0x09 },
220 { 0x5D, 0x30 },
221 { 0x5E, 0x01 },
222 { 0x5F, 0x02 },
223 { 0x60, 0x30 },
224 { 0x61, 0x03 },
225 { 0x62, 0x04 },
226 { 0x63, 0x06 },
227 { 0x64, 0x6A },
228 { 0x65, 0x75 },
229 { 0x66, 0x0F },
230 { 0x67, 0xB3 },
231 { 0x68, 0x0B },
232 { 0x69, 0x06 },
233 { 0x6A, 0x6A },
234 { 0x6B, 0x10 },
235 { 0x6C, 0x00 },
236 { 0x6D, 0x04 },
237 { 0x6E, 0x04 },
238 { 0x6F, 0x88 },
239 { 0x70, 0x00 },
240 { 0x71, 0x00 },
241 { 0x72, 0x06 },
242 { 0x73, 0x7B },
243 { 0x74, 0x00 },
244 { 0x75, 0xBC },
245 { 0x76, 0x00 },
246 { 0x77, 0x05 },
247 { 0x78, 0x2E },
248 { 0x79, 0x00 },
249 { 0x7A, 0x00 },
250 { 0x7B, 0x00 },
251 { 0x7C, 0x00 },
252 { 0x7D, 0x03 },
253 { 0x7E, 0x7B },
254 { 0xE0, 0x04 },
255 { 0x09, 0x10 },
256 { 0x2B, 0x2B },
257 { 0x2E, 0x44 },
258 { 0xE0, 0x00 },
259 { 0xE6, 0x02 },
260 { 0xE7, 0x02 },
261 { 0x35, 0x00 },
262};
263
264static inline
265struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
266{
267 return container_of(panel, struct ltk500hd1829, panel);
268}
269
270static int ltk500hd1829_unprepare(struct drm_panel *panel)
271{
272 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
273 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
274 int ret;
275
276 if (!ctx->prepared)
277 return 0;
278
279 ret = mipi_dsi_dcs_set_display_off(dsi);
280 if (ret < 0)
281 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
282 ret);
283
284 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
285 if (ret < 0) {
286 DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
287 ret);
288 }
289
290 /* 120ms to enter sleep mode */
291 msleep(120);
292
293 regulator_disable(ctx->iovcc);
294 regulator_disable(ctx->vcc);
295
296 ctx->prepared = false;
297
298 return 0;
299}
300
301static int ltk500hd1829_prepare(struct drm_panel *panel)
302{
303 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
304 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
305 unsigned int i;
306 int ret;
307
308 if (ctx->prepared)
309 return 0;
310
311 ret = regulator_enable(ctx->vcc);
312 if (ret < 0) {
313 DRM_DEV_ERROR(ctx->dev,
314 "Failed to enable vci supply: %d\n", ret);
315 return ret;
316 }
317 ret = regulator_enable(ctx->iovcc);
318 if (ret < 0) {
319 DRM_DEV_ERROR(ctx->dev,
320 "Failed to enable iovcc supply: %d\n", ret);
321 goto disable_vcc;
322 }
323
324 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
325 /* tRW: 10us */
326 usleep_range(10, 20);
327 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
328
329 /* tRT: >= 5ms */
330 usleep_range(5000, 6000);
331
332 for (i = 0; i < ARRAY_SIZE(init_code); i++) {
333 ret = mipi_dsi_generic_write(dsi, &init_code[i],
334 sizeof(struct ltk500hd1829_cmd));
335 if (ret < 0) {
336 DRM_DEV_ERROR(panel->dev,
337 "failed to write init cmds: %d\n", ret);
338 goto disable_iovcc;
339 }
340 }
341
342 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
343 if (ret < 0) {
344 DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
345 ret);
346 goto disable_iovcc;
347 }
348
349 /* 120ms to exit sleep mode */
350 msleep(120);
351
352 ret = mipi_dsi_dcs_set_display_on(dsi);
353 if (ret < 0) {
354 DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
355 ret);
356 goto disable_iovcc;
357 }
358
359 ctx->prepared = true;
360
361 return 0;
362
363disable_iovcc:
364 regulator_disable(ctx->iovcc);
365disable_vcc:
366 regulator_disable(ctx->vcc);
367 return ret;
368}
369
370static const struct drm_display_mode default_mode = {
371 .hdisplay = 720,
372 .hsync_start = 720 + 50,
373 .hsync_end = 720 + 50 + 50,
374 .htotal = 720 + 50 + 50 + 50,
375 .vdisplay = 1280,
376 .vsync_start = 1280 + 30,
377 .vsync_end = 1280 + 30 + 4,
378 .vtotal = 1280 + 30 + 4 + 12,
379 .clock = 69217,
380 .width_mm = 62,
381 .height_mm = 110,
382};
383
384static int ltk500hd1829_get_modes(struct drm_panel *panel,
385 struct drm_connector *connector)
386{
387 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
388 struct drm_display_mode *mode;
389
390 mode = drm_mode_duplicate(connector->dev, &default_mode);
391 if (!mode) {
392 DRM_DEV_ERROR(ctx->dev, "failed to add mode %ux%ux@%u\n",
393 default_mode.hdisplay, default_mode.vdisplay,
394 drm_mode_vrefresh(&default_mode));
395 return -ENOMEM;
396 }
397
398 drm_mode_set_name(mode);
399
400 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
401 connector->display_info.width_mm = mode->width_mm;
402 connector->display_info.height_mm = mode->height_mm;
403 drm_mode_probed_add(connector, mode);
404
405 return 1;
406}
407
408static const struct drm_panel_funcs ltk500hd1829_funcs = {
409 .unprepare = ltk500hd1829_unprepare,
410 .prepare = ltk500hd1829_prepare,
411 .get_modes = ltk500hd1829_get_modes,
412};
413
414static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
415{
416 struct ltk500hd1829 *ctx;
417 struct device *dev = &dsi->dev;
418 int ret;
419
420 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
421 if (!ctx)
422 return -ENOMEM;
423
424 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
425 if (IS_ERR(ctx->reset_gpio)) {
426 DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
427 return PTR_ERR(ctx->reset_gpio);
428 }
429
430 ctx->vcc = devm_regulator_get(dev, "vcc");
431 if (IS_ERR(ctx->vcc)) {
432 ret = PTR_ERR(ctx->vcc);
433 if (ret != -EPROBE_DEFER)
434 DRM_DEV_ERROR(dev,
435 "Failed to request vcc regulator: %d\n",
436 ret);
437 return ret;
438 }
439
440 ctx->iovcc = devm_regulator_get(dev, "iovcc");
441 if (IS_ERR(ctx->iovcc)) {
442 ret = PTR_ERR(ctx->iovcc);
443 if (ret != -EPROBE_DEFER)
444 DRM_DEV_ERROR(dev,
445 "Failed to request iovcc regulator: %d\n",
446 ret);
447 return ret;
448 }
449
450 mipi_dsi_set_drvdata(dsi, ctx);
451
452 ctx->dev = dev;
453
454 dsi->lanes = 4;
455 dsi->format = MIPI_DSI_FMT_RGB888;
456 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
457 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET;
458
459 drm_panel_init(&ctx->panel, &dsi->dev, <k500hd1829_funcs,
460 DRM_MODE_CONNECTOR_DSI);
461
462 ret = drm_panel_of_backlight(&ctx->panel);
463 if (ret)
464 return ret;
465
466 drm_panel_add(&ctx->panel);
467
468 ret = mipi_dsi_attach(dsi);
469 if (ret < 0) {
470 DRM_DEV_ERROR(dev, "mipi_dsi_attach failed: %d\n", ret);
471 drm_panel_remove(&ctx->panel);
472 return ret;
473 }
474
475 return 0;
476}
477
478static void ltk500hd1829_shutdown(struct mipi_dsi_device *dsi)
479{
480 struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
481 int ret;
482
483 ret = drm_panel_unprepare(&ctx->panel);
484 if (ret < 0)
485 DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
486 ret);
487
488 ret = drm_panel_disable(&ctx->panel);
489 if (ret < 0)
490 DRM_DEV_ERROR(&dsi->dev, "Failed to disable panel: %d\n",
491 ret);
492}
493
494static int ltk500hd1829_remove(struct mipi_dsi_device *dsi)
495{
496 struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
497 int ret;
498
499 ltk500hd1829_shutdown(dsi);
500
501 ret = mipi_dsi_detach(dsi);
502 if (ret < 0)
503 DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
504 ret);
505
506 drm_panel_remove(&ctx->panel);
507
508 return 0;
509}
510
511static const struct of_device_id ltk500hd1829_of_match[] = {
512 { .compatible = "leadtek,ltk500hd1829", },
513 { /* sentinel */ }
514};
515MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);
516
517static struct mipi_dsi_driver ltk500hd1829_driver = {
518 .driver = {
519 .name = "panel-leadtek-ltk500hd1829",
520 .of_match_table = ltk500hd1829_of_match,
521 },
522 .probe = ltk500hd1829_probe,
523 .remove = ltk500hd1829_remove,
524 .shutdown = ltk500hd1829_shutdown,
525};
526module_mipi_dsi_driver(ltk500hd1829_driver);
527
528MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
529MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
530MODULE_LICENSE("GPL v2");