summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
blob: 0a94ab79a6c0f768227a3c273751913ef5bc512e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
/*
 * Copyright (C) 2016 InforceComputing
 * Author: Vinay Simha BN <simhavcs@gmail.com>
 *
 * Copyright (C) 2016 Linaro Ltd
 * Author: Sumit Semwal <sumit.semwal@linaro.org>
 *
 * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
 * JDI model LT070ME05000, and its data sheet is at:
 * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>

#include <video/mipi_display.h>

static const char * const regulator_names[] = {
	"vddp",
	"iovcc"
};

struct jdi_panel {
	struct drm_panel base;
	struct mipi_dsi_device *dsi;

	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];

	struct gpio_desc *enable_gpio;
	struct gpio_desc *reset_gpio;
	struct gpio_desc *dcdc_en_gpio;
	struct backlight_device *backlight;

	bool prepared;
	bool enabled;

	const struct drm_display_mode *mode;
};

static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
{
	return container_of(panel, struct jdi_panel, base);
}

static int jdi_panel_init(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct device *dev = &jdi->dsi->dev;
	int ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_soft_reset(dsi);
	if (ret < 0)
		return ret;

	usleep_range(10000, 20000);

	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
	if (ret < 0) {
		dev_err(dev, "failed to set pixel format: %d\n", ret);
		return ret;
	}

	ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
	if (ret < 0) {
		dev_err(dev, "failed to set column address: %d\n", ret);
		return ret;
	}

	ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
	if (ret < 0) {
		dev_err(dev, "failed to set page address: %d\n", ret);
		return ret;
	}

	/*
	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
	 *                  are active
	 * BIT(3) BL = 1    Backlight Control On
	 * BIT(2) DD = 0    Display Dimming is Off
	 */
	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
				 (u8[]){ 0x24 }, 1);
	if (ret < 0) {
		dev_err(dev, "failed to write control display: %d\n", ret);
		return ret;
	}

	/* CABC off */
	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
				 (u8[]){ 0x00 }, 1);
	if (ret < 0) {
		dev_err(dev, "failed to set cabc off: %d\n", ret);
		return ret;
	}

	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
	if (ret < 0) {
		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
		return ret;
	}

	msleep(120);

	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
	if (ret < 0) {
		dev_err(dev, "failed to set mcap: %d\n", ret);
		return ret;
	}

	mdelay(10);

	/* Interface setting, video mode */
	ret = mipi_dsi_generic_write(dsi, (u8[])
				     {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
	if (ret < 0) {
		dev_err(dev, "failed to set display interface setting: %d\n"
			, ret);
		return ret;
	}

	mdelay(20);

	ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
	if (ret < 0) {
		dev_err(dev, "failed to set default values for mcap: %d\n"
			, ret);
		return ret;
	}

	return 0;
}

static int jdi_panel_on(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct device *dev = &jdi->dsi->dev;
	int ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_on(dsi);
	if (ret < 0)
		dev_err(dev, "failed to set display on: %d\n", ret);

	return ret;
}

static void jdi_panel_off(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct device *dev = &jdi->dsi->dev;
	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_off(dsi);
	if (ret < 0)
		dev_err(dev, "failed to set display off: %d\n", ret);

	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
	if (ret < 0)
		dev_err(dev, "failed to enter sleep mode: %d\n", ret);

	msleep(100);
}

static int jdi_panel_disable(struct drm_panel *panel)
{
	struct jdi_panel *jdi = to_jdi_panel(panel);

	if (!jdi->enabled)
		return 0;

	backlight_disable(jdi->backlight);

	jdi->enabled = false;

	return 0;
}

static int jdi_panel_unprepare(struct drm_panel *panel)
{
	struct jdi_panel *jdi = to_jdi_panel(panel);
	struct device *dev = &jdi->dsi->dev;
	int ret;

	if (!jdi->prepared)
		return 0;

	jdi_panel_off(jdi);

	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	if (ret < 0)
		dev_err(dev, "regulator disable failed, %d\n", ret);

	gpiod_set_value(jdi->enable_gpio, 0);

	gpiod_set_value(jdi->reset_gpio, 1);

	gpiod_set_value(jdi->dcdc_en_gpio, 0);

	jdi->prepared = false;

	return 0;
}

static int jdi_panel_prepare(struct drm_panel *panel)
{
	struct jdi_panel *jdi = to_jdi_panel(panel);
	struct device *dev = &jdi->dsi->dev;
	int ret;

	if (jdi->prepared)
		return 0;

	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	if (ret < 0) {
		dev_err(dev, "regulator enable failed, %d\n", ret);
		return ret;
	}

	msleep(20);

	gpiod_set_value(jdi->dcdc_en_gpio, 1);
	usleep_range(10, 20);

	gpiod_set_value(jdi->reset_gpio, 0);
	usleep_range(10, 20);

	gpiod_set_value(jdi->enable_gpio, 1);
	usleep_range(10, 20);

	ret = jdi_panel_init(jdi);
	if (ret < 0) {
		dev_err(dev, "failed to init panel: %d\n", ret);
		goto poweroff;
	}

	ret = jdi_panel_on(jdi);
	if (ret < 0) {
		dev_err(dev, "failed to set panel on: %d\n", ret);
		goto poweroff;
	}

	jdi->prepared = true;

	return 0;

poweroff:
	ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
	if (ret < 0)
		dev_err(dev, "regulator disable failed, %d\n", ret);

	gpiod_set_value(jdi->enable_gpio, 0);

	gpiod_set_value(jdi->reset_gpio, 1);

	gpiod_set_value(jdi->dcdc_en_gpio, 0);

	return ret;
}

static int jdi_panel_enable(struct drm_panel *panel)
{
	struct jdi_panel *jdi = to_jdi_panel(panel);

	if (jdi->enabled)
		return 0;

	backlight_enable(jdi->backlight);

	jdi->enabled = true;

	return 0;
}

static const struct drm_display_mode default_mode = {
		.clock = 155493,
		.hdisplay = 1200,
		.hsync_start = 1200 + 48,
		.hsync_end = 1200 + 48 + 32,
		.htotal = 1200 + 48 + 32 + 60,
		.vdisplay = 1920,
		.vsync_start = 1920 + 3,
		.vsync_end = 1920 + 3 + 5,
		.vtotal = 1920 + 3 + 5 + 6,
		.vrefresh = 60,
		.flags = 0,
};

static int jdi_panel_get_modes(struct drm_panel *panel)
{
	struct drm_display_mode *mode;
	struct jdi_panel *jdi = to_jdi_panel(panel);
	struct device *dev = &jdi->dsi->dev;

	mode = drm_mode_duplicate(panel->drm, &default_mode);
	if (!mode) {
		dev_err(dev, "failed to add mode %ux%ux@%u\n",
			default_mode.hdisplay, default_mode.vdisplay,
			default_mode.vrefresh);
		return -ENOMEM;
	}

	drm_mode_set_name(mode);

	drm_mode_probed_add(panel->connector, mode);

	panel->connector->display_info.width_mm = 95;
	panel->connector->display_info.height_mm = 151;

	return 1;
}

static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	int ret;
	u16 brightness = bl->props.brightness;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
	if (ret < 0)
		return ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	return brightness & 0xff;
}

static int dsi_dcs_bl_update_status(struct backlight_device *bl)
{
	struct mipi_dsi_device *dsi = bl_get_data(bl);
	int ret;

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
	if (ret < 0)
		return ret;

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	return 0;
}

static const struct backlight_ops dsi_bl_ops = {
	.update_status = dsi_dcs_bl_update_status,
	.get_brightness = dsi_dcs_bl_get_brightness,
};

static struct backlight_device *
drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
{
	struct device *dev = &dsi->dev;
	struct backlight_properties props;

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.brightness = 255;
	props.max_brightness = 255;

	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
					      &dsi_bl_ops, &props);
}

static const struct drm_panel_funcs jdi_panel_funcs = {
	.disable = jdi_panel_disable,
	.unprepare = jdi_panel_unprepare,
	.prepare = jdi_panel_prepare,
	.enable = jdi_panel_enable,
	.get_modes = jdi_panel_get_modes,
};

static const struct of_device_id jdi_of_match[] = {
	{ .compatible = "jdi,lt070me05000", },
	{ }
};
MODULE_DEVICE_TABLE(of, jdi_of_match);

static int jdi_panel_add(struct jdi_panel *jdi)
{
	struct device *dev = &jdi->dsi->dev;
	int ret;
	unsigned int i;

	jdi->mode = &default_mode;

	for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
		jdi->supplies[i].supply = regulator_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
				      jdi->supplies);
	if (ret < 0) {
		dev_err(dev, "failed to init regulator, ret=%d\n", ret);
		return ret;
	}

	jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
	if (IS_ERR(jdi->enable_gpio)) {
		ret = PTR_ERR(jdi->enable_gpio);
		dev_err(dev, "cannot get enable-gpio %d\n", ret);
		return ret;
	}

	jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(jdi->reset_gpio)) {
		ret = PTR_ERR(jdi->reset_gpio);
		dev_err(dev, "cannot get reset-gpios %d\n", ret);
		return ret;
	}

	jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
	if (IS_ERR(jdi->dcdc_en_gpio)) {
		ret = PTR_ERR(jdi->dcdc_en_gpio);
		dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
		return ret;
	}

	jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
	if (IS_ERR(jdi->backlight)) {
		ret = PTR_ERR(jdi->backlight);
		dev_err(dev, "failed to register backlight %d\n", ret);
		return ret;
	}

	drm_panel_init(&jdi->base);
	jdi->base.funcs = &jdi_panel_funcs;
	jdi->base.dev = &jdi->dsi->dev;

	ret = drm_panel_add(&jdi->base);

	return ret;
}

static void jdi_panel_del(struct jdi_panel *jdi)
{
	if (jdi->base.dev)
		drm_panel_remove(&jdi->base);
}

static int jdi_panel_probe(struct mipi_dsi_device *dsi)
{
	struct jdi_panel *jdi;
	int ret;

	dsi->lanes = 4;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags =  MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
			   MIPI_DSI_CLOCK_NON_CONTINUOUS;

	jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
	if (!jdi)
		return -ENOMEM;

	mipi_dsi_set_drvdata(dsi, jdi);

	jdi->dsi = dsi;

	ret = jdi_panel_add(jdi);
	if (ret < 0)
		return ret;

	return mipi_dsi_attach(dsi);
}

static int jdi_panel_remove(struct mipi_dsi_device *dsi)
{
	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
	int ret;

	ret = jdi_panel_disable(&jdi->base);
	if (ret < 0)
		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);

	ret = mipi_dsi_detach(dsi);
	if (ret < 0)
		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
			ret);

	drm_panel_detach(&jdi->base);
	jdi_panel_del(jdi);

	return 0;
}

static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
{
	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);

	jdi_panel_disable(&jdi->base);
}

static struct mipi_dsi_driver jdi_panel_driver = {
	.driver = {
		.name = "panel-jdi-lt070me05000",
		.of_match_table = jdi_of_match,
	},
	.probe = jdi_panel_probe,
	.remove = jdi_panel_remove,
	.shutdown = jdi_panel_shutdown,
};
module_mipi_dsi_driver(jdi_panel_driver);

MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
MODULE_LICENSE("GPL v2");