summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/panel/panel-dsi-cm.c
blob: 6b3f4d664d2ade668525660394cf81924436492e (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
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic DSI Command Mode panel driver
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <drm/drm_connector.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>

#include <video/mipi_display.h>

#define DCS_GET_ID1		0xda
#define DCS_GET_ID2		0xdb
#define DCS_GET_ID3		0xdc

#define DCS_REGULATOR_SUPPLY_NUM 2

static const struct of_device_id dsicm_of_match[];

struct dsic_panel_data {
	u32 xres;
	u32 yres;
	u32 refresh;
	u32 width_mm;
	u32 height_mm;
	u32 max_hs_rate;
	u32 max_lp_rate;
	bool te_support;
};

struct panel_drv_data {
	struct mipi_dsi_device *dsi;
	struct drm_panel panel;
	struct drm_display_mode mode;

	struct mutex lock;

	struct backlight_device *bldev;
	struct backlight_device *extbldev;

	unsigned long	hw_guard_end;	/* next value of jiffies when we can
					 * issue the next sleep in/out command
					 */
	unsigned long	hw_guard_wait;	/* max guard time in jiffies */

	const struct dsic_panel_data *panel_data;

	struct gpio_desc *reset_gpio;

	struct regulator_bulk_data supplies[DCS_REGULATOR_SUPPLY_NUM];

	bool use_dsi_backlight;

	/* runtime variables */
	bool enabled;

	bool intro_printed;
};

static inline struct panel_drv_data *panel_to_ddata(struct drm_panel *panel)
{
	return container_of(panel, struct panel_drv_data, panel);
}

static void dsicm_bl_power(struct panel_drv_data *ddata, bool enable)
{
	struct backlight_device *backlight;

	if (ddata->bldev)
		backlight = ddata->bldev;
	else if (ddata->extbldev)
		backlight = ddata->extbldev;
	else
		return;

	if (enable)
		backlight_enable(backlight);
	else
		backlight_disable(backlight);
}

static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
{
	ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
	ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
}

static void hw_guard_wait(struct panel_drv_data *ddata)
{
	unsigned long wait = ddata->hw_guard_end - jiffies;

	if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(wait);
	}
}

static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
{
	return mipi_dsi_dcs_read(ddata->dsi, dcs_cmd, data, 1);
}

static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
{
	return mipi_dsi_dcs_write(ddata->dsi, dcs_cmd, &param, 1);
}

static int dsicm_sleep_in(struct panel_drv_data *ddata)

{
	int r;

	hw_guard_wait(ddata);

	r = mipi_dsi_dcs_enter_sleep_mode(ddata->dsi);
	if (r)
		return r;

	hw_guard_start(ddata, 120);

	usleep_range(5000, 10000);

	return 0;
}

static int dsicm_sleep_out(struct panel_drv_data *ddata)
{
	int r;

	hw_guard_wait(ddata);

	r = mipi_dsi_dcs_exit_sleep_mode(ddata->dsi);
	if (r)
		return r;

	hw_guard_start(ddata, 120);

	usleep_range(5000, 10000);

	return 0;
}

static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
{
	int r;

	r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
	if (r)
		return r;
	r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
	if (r)
		return r;
	r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
	if (r)
		return r;

	return 0;
}

static int dsicm_set_update_window(struct panel_drv_data *ddata)
{
	struct mipi_dsi_device *dsi = ddata->dsi;
	int r;

	r = mipi_dsi_dcs_set_column_address(dsi, 0, ddata->mode.hdisplay - 1);
	if (r < 0)
		return r;

	r = mipi_dsi_dcs_set_page_address(dsi, 0, ddata->mode.vdisplay - 1);
	if (r < 0)
		return r;

	return 0;
}

static int dsicm_bl_update_status(struct backlight_device *dev)
{
	struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
	int r = 0;
	int level = backlight_get_brightness(dev);

	dev_dbg(&ddata->dsi->dev, "update brightness to %d\n", level);

	mutex_lock(&ddata->lock);

	if (ddata->enabled)
		r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
				      level);

	mutex_unlock(&ddata->lock);

	return r;
}

static int dsicm_bl_get_intensity(struct backlight_device *dev)
{
	return backlight_get_brightness(dev);
}

static const struct backlight_ops dsicm_bl_ops = {
	.get_brightness = dsicm_bl_get_intensity,
	.update_status  = dsicm_bl_update_status,
};

static ssize_t num_dsi_errors_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct panel_drv_data *ddata = dev_get_drvdata(dev);
	u8 errors = 0;
	int r = -ENODEV;

	mutex_lock(&ddata->lock);

	if (ddata->enabled)
		r = dsicm_dcs_read_1(ddata, MIPI_DCS_GET_ERROR_COUNT_ON_DSI, &errors);

	mutex_unlock(&ddata->lock);

	if (r)
		return r;

	return sysfs_emit(buf, "%d\n", errors);
}

static ssize_t hw_revision_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct panel_drv_data *ddata = dev_get_drvdata(dev);
	u8 id1, id2, id3;
	int r = -ENODEV;

	mutex_lock(&ddata->lock);

	if (ddata->enabled)
		r = dsicm_get_id(ddata, &id1, &id2, &id3);

	mutex_unlock(&ddata->lock);

	if (r)
		return r;

	return sysfs_emit(buf, "%02x.%02x.%02x\n", id1, id2, id3);
}

static DEVICE_ATTR_RO(num_dsi_errors);
static DEVICE_ATTR_RO(hw_revision);

static struct attribute *dsicm_attrs[] = {
	&dev_attr_num_dsi_errors.attr,
	&dev_attr_hw_revision.attr,
	NULL,
};

static const struct attribute_group dsicm_attr_group = {
	.attrs = dsicm_attrs,
};

static void dsicm_hw_reset(struct panel_drv_data *ddata)
{
	gpiod_set_value(ddata->reset_gpio, 1);
	udelay(10);
	/* reset the panel */
	gpiod_set_value(ddata->reset_gpio, 0);
	/* assert reset */
	udelay(10);
	gpiod_set_value(ddata->reset_gpio, 1);
	/* wait after releasing reset */
	usleep_range(5000, 10000);
}

static int dsicm_power_on(struct panel_drv_data *ddata)
{
	u8 id1, id2, id3;
	int r;

	dsicm_hw_reset(ddata);

	ddata->dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	r = dsicm_sleep_out(ddata);
	if (r)
		goto err;

	r = dsicm_get_id(ddata, &id1, &id2, &id3);
	if (r)
		goto err;

	r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 0xff);
	if (r)
		goto err;

	r = dsicm_dcs_write_1(ddata, MIPI_DCS_WRITE_CONTROL_DISPLAY,
			(1<<2) | (1<<5));	/* BL | BCTRL */
	if (r)
		goto err;

	r = mipi_dsi_dcs_set_pixel_format(ddata->dsi, MIPI_DCS_PIXEL_FMT_24BIT);
	if (r)
		goto err;

	r = dsicm_set_update_window(ddata);
	if (r)
		goto err;

	r = mipi_dsi_dcs_set_display_on(ddata->dsi);
	if (r)
		goto err;

	if (ddata->panel_data->te_support) {
		r = mipi_dsi_dcs_set_tear_on(ddata->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
		if (r)
			goto err;
	}

	/* possible panel bug */
	msleep(100);

	ddata->enabled = true;

	if (!ddata->intro_printed) {
		dev_info(&ddata->dsi->dev, "panel revision %02x.%02x.%02x\n",
			id1, id2, id3);
		ddata->intro_printed = true;
	}

	ddata->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	return 0;
err:
	dev_err(&ddata->dsi->dev, "error while enabling panel, issuing HW reset\n");

	dsicm_hw_reset(ddata);

	return r;
}

static int dsicm_power_off(struct panel_drv_data *ddata)
{
	int r;

	ddata->enabled = false;

	r = mipi_dsi_dcs_set_display_off(ddata->dsi);
	if (!r)
		r = dsicm_sleep_in(ddata);

	if (r) {
		dev_err(&ddata->dsi->dev,
				"error disabling panel, issuing HW reset\n");
		dsicm_hw_reset(ddata);
	}

	return r;
}

static int dsicm_prepare(struct drm_panel *panel)
{
	struct panel_drv_data *ddata = panel_to_ddata(panel);
	int r;

	r = regulator_bulk_enable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
	if (r)
		dev_err(&ddata->dsi->dev, "failed to enable supplies: %d\n", r);

	return r;
}

static int dsicm_enable(struct drm_panel *panel)
{
	struct panel_drv_data *ddata = panel_to_ddata(panel);
	int r;

	mutex_lock(&ddata->lock);

	r = dsicm_power_on(ddata);
	if (r)
		goto err;

	mutex_unlock(&ddata->lock);

	dsicm_bl_power(ddata, true);

	return 0;
err:
	dev_err(&ddata->dsi->dev, "enable failed (%d)\n", r);
	mutex_unlock(&ddata->lock);
	return r;
}

static int dsicm_unprepare(struct drm_panel *panel)
{
	struct panel_drv_data *ddata = panel_to_ddata(panel);
	int r;

	r = regulator_bulk_disable(ARRAY_SIZE(ddata->supplies), ddata->supplies);
	if (r)
		dev_err(&ddata->dsi->dev, "failed to disable supplies: %d\n", r);

	return r;
}

static int dsicm_disable(struct drm_panel *panel)
{
	struct panel_drv_data *ddata = panel_to_ddata(panel);
	int r;

	dsicm_bl_power(ddata, false);

	mutex_lock(&ddata->lock);

	r = dsicm_power_off(ddata);

	mutex_unlock(&ddata->lock);

	return r;
}

static int dsicm_get_modes(struct drm_panel *panel,
			   struct drm_connector *connector)
{
	struct panel_drv_data *ddata = panel_to_ddata(panel);
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, &ddata->mode);
	if (!mode) {
		dev_err(&ddata->dsi->dev, "failed to add mode %ux%ux@%u kHz\n",
			ddata->mode.hdisplay, ddata->mode.vdisplay,
			ddata->mode.clock);
		return -ENOMEM;
	}

	connector->display_info.width_mm = ddata->panel_data->width_mm;
	connector->display_info.height_mm = ddata->panel_data->height_mm;

	drm_mode_probed_add(connector, mode);

	return 1;
}

static const struct drm_panel_funcs dsicm_panel_funcs = {
	.unprepare = dsicm_unprepare,
	.disable = dsicm_disable,
	.prepare = dsicm_prepare,
	.enable = dsicm_enable,
	.get_modes = dsicm_get_modes,
};

static int dsicm_probe_of(struct mipi_dsi_device *dsi)
{
	struct backlight_device *backlight;
	struct panel_drv_data *ddata = mipi_dsi_get_drvdata(dsi);
	int err;
	struct drm_display_mode *mode = &ddata->mode;

	ddata->reset_gpio = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ddata->reset_gpio)) {
		err = PTR_ERR(ddata->reset_gpio);
		dev_err(&dsi->dev, "reset gpio request failed: %d", err);
		return err;
	}

	mode->hdisplay = mode->hsync_start = mode->hsync_end = mode->htotal =
		ddata->panel_data->xres;
	mode->vdisplay = mode->vsync_start = mode->vsync_end = mode->vtotal =
		ddata->panel_data->yres;
	mode->clock = ddata->panel_data->xres * ddata->panel_data->yres *
		ddata->panel_data->refresh / 1000;
	mode->width_mm = ddata->panel_data->width_mm;
	mode->height_mm = ddata->panel_data->height_mm;
	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
	drm_mode_set_name(mode);

	ddata->supplies[0].supply = "vpnl";
	ddata->supplies[1].supply = "vddi";
	err = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(ddata->supplies),
				      ddata->supplies);
	if (err)
		return err;

	backlight = devm_of_find_backlight(&dsi->dev);
	if (IS_ERR(backlight))
		return PTR_ERR(backlight);

	/* If no backlight device is found assume native backlight support */
	if (backlight)
		ddata->extbldev = backlight;
	else
		ddata->use_dsi_backlight = true;

	return 0;
}

static int dsicm_probe(struct mipi_dsi_device *dsi)
{
	struct panel_drv_data *ddata;
	struct backlight_device *bldev = NULL;
	struct device *dev = &dsi->dev;
	int r;

	dev_dbg(dev, "probe\n");

	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	mipi_dsi_set_drvdata(dsi, ddata);
	ddata->dsi = dsi;

	ddata->panel_data = of_device_get_match_data(dev);
	if (!ddata->panel_data)
		return -ENODEV;

	r = dsicm_probe_of(dsi);
	if (r)
		return r;

	mutex_init(&ddata->lock);

	dsicm_hw_reset(ddata);

	drm_panel_init(&ddata->panel, dev, &dsicm_panel_funcs,
		       DRM_MODE_CONNECTOR_DSI);

	if (ddata->use_dsi_backlight) {
		struct backlight_properties props = { 0 };
		props.max_brightness = 255;
		props.type = BACKLIGHT_RAW;

		bldev = devm_backlight_device_register(dev, dev_name(dev),
			dev, ddata, &dsicm_bl_ops, &props);
		if (IS_ERR(bldev)) {
			r = PTR_ERR(bldev);
			goto err_bl;
		}

		ddata->bldev = bldev;
	}

	r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
	if (r) {
		dev_err(dev, "failed to create sysfs files\n");
		goto err_bl;
	}

	dsi->lanes = 2;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
			  MIPI_DSI_MODE_NO_EOT_PACKET;
	dsi->hs_rate = ddata->panel_data->max_hs_rate;
	dsi->lp_rate = ddata->panel_data->max_lp_rate;

	drm_panel_add(&ddata->panel);

	r = mipi_dsi_attach(dsi);
	if (r < 0)
		goto err_dsi_attach;

	return 0;

err_dsi_attach:
	drm_panel_remove(&ddata->panel);
	sysfs_remove_group(&dsi->dev.kobj, &dsicm_attr_group);
err_bl:
	if (ddata->extbldev)
		put_device(&ddata->extbldev->dev);

	return r;
}

static void dsicm_remove(struct mipi_dsi_device *dsi)
{
	struct panel_drv_data *ddata = mipi_dsi_get_drvdata(dsi);

	dev_dbg(&dsi->dev, "remove\n");

	mipi_dsi_detach(dsi);

	drm_panel_remove(&ddata->panel);

	sysfs_remove_group(&dsi->dev.kobj, &dsicm_attr_group);

	if (ddata->extbldev)
		put_device(&ddata->extbldev->dev);
}

static const struct dsic_panel_data taal_data = {
	.xres = 864,
	.yres = 480,
	.refresh = 60,
	.width_mm = 0,
	.height_mm = 0,
	.max_hs_rate = 300000000,
	.max_lp_rate = 10000000,
	.te_support = true,
};

static const struct dsic_panel_data himalaya_data = {
	.xres = 480,
	.yres = 864,
	.refresh = 60,
	.width_mm = 49,
	.height_mm = 88,
	.max_hs_rate = 300000000,
	.max_lp_rate = 10000000,
	.te_support = false,
};

static const struct dsic_panel_data droid4_data = {
	.xres = 540,
	.yres = 960,
	.refresh = 60,
	.width_mm = 50,
	.height_mm = 89,
	.max_hs_rate = 300000000,
	.max_lp_rate = 10000000,
	.te_support = false,
};

static const struct of_device_id dsicm_of_match[] = {
	{ .compatible = "tpo,taal", .data = &taal_data },
	{ .compatible = "nokia,himalaya", &himalaya_data },
	{ .compatible = "motorola,droid4-panel", &droid4_data },
	{},
};

MODULE_DEVICE_TABLE(of, dsicm_of_match);

static struct mipi_dsi_driver dsicm_driver = {
	.probe = dsicm_probe,
	.remove = dsicm_remove,
	.driver = {
		.name = "panel-dsi-cm",
		.of_match_table = dsicm_of_match,
	},
};
module_mipi_dsi_driver(dsicm_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
MODULE_LICENSE("GPL");