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