aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/omap/lcd_mipid.c
blob: 918ee893419696f843044ebcd57b533d92849ccb (plain) (blame)
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
/*
 * LCD driver for MIPI DBI-C / DCS compatible LCDs
 *
 * Copyright (C) 2006 Nokia Corporation
 * Author: Imre Deak <imre.deak@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/spi/spi.h>

#include <mach/omapfb.h>
#include <mach/lcd_mipid.h>

#define MIPID_MODULE_NAME		"lcd_mipid"

#define MIPID_CMD_READ_DISP_ID		0x04
#define MIPID_CMD_READ_RED		0x06
#define MIPID_CMD_READ_GREEN		0x07
#define MIPID_CMD_READ_BLUE		0x08
#define MIPID_CMD_READ_DISP_STATUS	0x09
#define MIPID_CMD_RDDSDR		0x0F
#define MIPID_CMD_SLEEP_IN		0x10
#define MIPID_CMD_SLEEP_OUT		0x11
#define MIPID_CMD_DISP_OFF		0x28
#define MIPID_CMD_DISP_ON		0x29

#define MIPID_ESD_CHECK_PERIOD		msecs_to_jiffies(5000)

#define to_mipid_device(p)		container_of(p, struct mipid_device, \
						panel)
struct mipid_device {
	int		enabled;
	int		revision;
	unsigned int	saved_bklight_level;
	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 */

	struct omapfb_device	*fbdev;
	struct spi_device	*spi;
	struct mutex		mutex;
	struct lcd_panel	panel;

	struct workqueue_struct	*esd_wq;
	struct delayed_work	esd_work;
	void			(*esd_check)(struct mipid_device *m);
};

static void mipid_transfer(struct mipid_device *md, int cmd, const u8 *wbuf,
			   int wlen, u8 *rbuf, int rlen)
{
	struct spi_message	m;
	struct spi_transfer	*x, xfer[4];
	u16			w;
	int			r;

	BUG_ON(md->spi == NULL);

	spi_message_init(&m);

	memset(xfer, 0, sizeof(xfer));
	x = &xfer[0];

	cmd &=  0xff;
	x->tx_buf		= &cmd;
	x->bits_per_word	= 9;
	x->len			= 2;
	spi_message_add_tail(x, &m);

	if (wlen) {
		x++;
		x->tx_buf		= wbuf;
		x->len			= wlen;
		x->bits_per_word	= 9;
		spi_message_add_tail(x, &m);
	}

	if (rlen) {
		x++;
		x->rx_buf	= &w;
		x->len		= 1;
		spi_message_add_tail(x, &m);

		if (rlen > 1) {
			/* Arrange for the extra clock before the first
			 * data bit.
			 */
			x->bits_per_word = 9;
			x->len		 = 2;

			x++;
			x->rx_buf	 = &rbuf[1];
			x->len		 = rlen - 1;
			spi_message_add_tail(x, &m);
		}
	}

	r = spi_sync(md->spi, &m);
	if (r < 0)
		dev_dbg(&md->spi->dev, "spi_sync %d\n", r);

	if (rlen)
		rbuf[0] = w & 0xff;
}

static inline void mipid_cmd(struct mipid_device *md, int cmd)
{
	mipid_transfer(md, cmd, NULL, 0, NULL, 0);
}

static inline void mipid_write(struct mipid_device *md,
			       int reg, const u8 *buf, int len)
{
	mipid_transfer(md, reg, buf, len, NULL, 0);
}

static inline void mipid_read(struct mipid_device *md,
			      int reg, u8 *buf, int len)
{
	mipid_transfer(md, reg, NULL, 0, buf, len);
}

static void set_data_lines(struct mipid_device *md, int data_lines)
{
	u16 par;

	switch (data_lines) {
	case 16:
		par = 0x150;
		break;
	case 18:
		par = 0x160;
		break;
	case 24:
		par = 0x170;
		break;
	}
	mipid_write(md, 0x3a, (u8 *)&par, 2);
}

static void send_init_string(struct mipid_device *md)
{
	u16 initpar[] = { 0x0102, 0x0100, 0x0100 };

	mipid_write(md, 0xc2, (u8 *)initpar, sizeof(initpar));
	set_data_lines(md, md->panel.data_lines);
}

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

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

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

static void set_sleep_mode(struct mipid_device *md, int on)
{
	int cmd, sleep_time = 50;

	if (on)
		cmd = MIPID_CMD_SLEEP_IN;
	else
		cmd = MIPID_CMD_SLEEP_OUT;
	hw_guard_wait(md);
	mipid_cmd(md, cmd);
	hw_guard_start(md, 120);
	/*
	 * When we enable the panel, it seems we _have_ to sleep
	 * 120 ms before sending the init string. When disabling the
	 * panel we'll sleep for the duration of 2 frames, so that the
	 * controller can still provide the PCLK,HS,VS signals.
	 */
	if (!on)
		sleep_time = 120;
	msleep(sleep_time);
}

static void set_display_state(struct mipid_device *md, int enabled)
{
	int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF;

	mipid_cmd(md, cmd);
}

static int mipid_set_bklight_level(struct lcd_panel *panel, unsigned int level)
{
	struct mipid_device *md = to_mipid_device(panel);
	struct mipid_platform_data *pd = md->spi->dev.platform_data;

	if (pd->get_bklight_max == NULL || pd->set_bklight_level == NULL)
		return -ENODEV;
	if (level > pd->get_bklight_max(pd))
		return -EINVAL;
	if (!md->enabled) {
		md->saved_bklight_level = level;
		return 0;
	}
	pd->set_bklight_level(pd, level);

	return 0;
}

static unsigned int mipid_get_bklight_level(struct lcd_panel *panel)
{
	struct mipid_device *md = to_mipid_device(panel);
	struct mipid_platform_data *pd = md->spi->dev.platform_data;

	if (pd->get_bklight_level == NULL)
		return -ENODEV;
	return pd->get_bklight_level(pd);
}

static unsigned int mipid_get_bklight_max(struct lcd_panel *panel)
{
	struct mipid_device *md = to_mipid_device(panel);
	struct mipid_platform_data *pd = md->spi->dev.platform_data;

	if (pd->get_bklight_max == NULL)
		return -ENODEV;

	return pd->get_bklight_max(pd);
}

static unsigned long mipid_get_caps(struct lcd_panel *panel)
{
	return OMAPFB_CAPS_SET_BACKLIGHT;
}

static u16 read_first_pixel(struct mipid_device *md)
{
	u16 pixel;
	u8 red, green, blue;

	mutex_lock(&md->mutex);
	mipid_read(md, MIPID_CMD_READ_RED, &red, 1);
	mipid_read(md, MIPID_CMD_READ_GREEN, &green, 1);
	mipid_read(md, MIPID_CMD_READ_BLUE, &blue, 1);
	mutex_unlock(&md->mutex);

	switch (md->panel.data_lines) {
	case 16:
		pixel = ((red >> 1) << 11) | (green << 5) | (blue >> 1);
		break;
	case 24:
		/* 24 bit -> 16 bit */
		pixel = ((red >> 3) << 11) | ((green >> 2) << 5) |
			(blue >> 3);
		break;
	default:
		pixel = 0;
		BUG();
	}

	return pixel;
}

static int mipid_run_test(struct lcd_panel *panel, int test_num)
{
	struct mipid_device *md = to_mipid_device(panel);
	static const u16 test_values[4] = {
		0x0000, 0xffff, 0xaaaa, 0x5555,
	};
	int i;

	if (test_num != MIPID_TEST_RGB_LINES)
		return MIPID_TEST_INVALID;

	for (i = 0; i < ARRAY_SIZE(test_values); i++) {
		int delay;
		unsigned long tmo;

		omapfb_write_first_pixel(md->fbdev, test_values[i]);
		tmo = jiffies + msecs_to_jiffies(100);
		delay = 25;
		while (1) {
			u16 pixel;

			msleep(delay);
			pixel = read_first_pixel(md);
			if (pixel == test_values[i])
				break;
			if (time_after(jiffies, tmo)) {
				dev_err(&md->spi->dev,
					"MIPI LCD RGB I/F test failed: "
					"expecting %04x, got %04x\n",
					test_values[i], pixel);
				return MIPID_TEST_FAILED;
			}
			delay = 10;
		}
	}

	return 0;
}

static void ls041y3_esd_recover(struct mipid_device *md)
{
	dev_err(&md->spi->dev, "performing LCD ESD recovery\n");
	set_sleep_mode(md, 1);
	set_sleep_mode(md, 0);
}

static void ls041y3_esd_check_mode1(struct mipid_device *md)
{
	u8 state1, state2;

	mipid_read(md, MIPID_CMD_RDDSDR, &state1, 1);
	set_sleep_mode(md, 0);
	mipid_read(md, MIPID_CMD_RDDSDR, &state2, 1);
	dev_dbg(&md->spi->dev, "ESD mode 1 state1 %02x state2 %02x\n",
		state1, state2);
	/* Each sleep out command will trigger a self diagnostic and flip
	* Bit6 if the test passes.
	*/
	if (!((state1 ^ state2) & (1 << 6)))
		ls041y3_esd_recover(md);
}

static void ls041y3_esd_check_mode2(struct mipid_device *md)
{
	int i;
	u8 rbuf[2];
	static const struct {
		int	cmd;
		int	wlen;
		u16	wbuf[3];
	} *rd, rd_ctrl[7] = {
		{ 0xb0, 4, { 0x0101, 0x01fe, } },
		{ 0xb1, 4, { 0x01de, 0x0121, } },
		{ 0xc2, 4, { 0x0100, 0x0100, } },
		{ 0xbd, 2, { 0x0100, } },
		{ 0xc2, 4, { 0x01fc, 0x0103, } },
		{ 0xb4, 0, },
		{ 0x00, 0, },
	};

	rd = rd_ctrl;
	for (i = 0; i < 3; i++, rd++)
		mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);

	udelay(10);
	mipid_read(md, rd->cmd, rbuf, 2);
	rd++;

	for (i = 0; i < 3; i++, rd++) {
		udelay(10);
		mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);
	}

	dev_dbg(&md->spi->dev, "ESD mode 2 state %02x\n", rbuf[1]);
	if (rbuf[1] == 0x00)
		ls041y3_esd_recover(md);
}

static void ls041y3_esd_check(struct mipid_device *md)
{
	ls041y3_esd_check_mode1(md);
	if (md->revision >= 0x88)
		ls041y3_esd_check_mode2(md);
}

static void mipid_esd_start_check(struct mipid_device *md)
{
	if (md->esd_check != NULL)
		queue_delayed_work(md->esd_wq, &md->esd_work,
				   MIPID_ESD_CHECK_PERIOD);
}

static void mipid_esd_stop_check(struct mipid_device *md)
{
	if (md->esd_check != NULL)
		cancel_rearming_delayed_workqueue(md->esd_wq, &md->esd_work);
}

static void mipid_esd_work(struct work_struct *work)
{
	struct mipid_device *md = container_of(work, struct mipid_device,
					       esd_work.work);

	mutex_lock(&md->mutex);
	md->esd_check(md);
	mutex_unlock(&md->mutex);
	mipid_esd_start_check(md);
}

static int mipid_enable(struct lcd_panel *panel)
{
	struct mipid_device *md = to_mipid_device(panel);

	mutex_lock(&md->mutex);

	if (md->enabled) {
		mutex_unlock(&md->mutex);
		return 0;
	}
	set_sleep_mode(md, 0);
	md->enabled = 1;
	send_init_string(md);
	set_display_state(md, 1);
	mipid_set_bklight_level(panel, md->saved_bklight_level);
	mipid_esd_start_check(md);

	mutex_unlock(&md->mutex);
	return 0;
}

static void mipid_disable(struct lcd_panel *panel)
{
	struct mipid_device *md = to_mipid_device(panel);

	/*
	 * A final ESD work might be called before returning,
	 * so do this without holding the lock.
	 */
	mipid_esd_stop_check(md);
	mutex_lock(&md->mutex);

	if (!md->enabled) {
		mutex_unlock(&md->mutex);
		return;
	}
	md->saved_bklight_level = mipid_get_bklight_level(panel);
	mipid_set_bklight_level(panel, 0);
	set_display_state(md, 0);
	set_sleep_mode(md, 1);
	md->enabled = 0;

	mutex_unlock(&md->mutex);
}

static int panel_enabled(struct mipid_device *md)
{
	u32 disp_status;
	int enabled;

	mipid_read(md, MIPID_CMD_READ_DISP_STATUS, (u8 *)&disp_status, 4);
	disp_status = __be32_to_cpu(disp_status);
	enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
	dev_dbg(&md->spi->dev,
		"LCD panel %senabled by bootloader (status 0x%04x)\n",
		enabled ? "" : "not ", disp_status);
	return enabled;
}

static int mipid_init(struct lcd_panel *panel,
			    struct omapfb_device *fbdev)
{
	struct mipid_device *md = to_mipid_device(panel);

	md->fbdev = fbdev;
	md->esd_wq = create_singlethread_workqueue("mipid_esd");
	if (md->esd_wq == NULL) {
		dev_err(&md->spi->dev, "can't create ESD workqueue\n");
		return -ENOMEM;
	}
	INIT_DELAYED_WORK(&md->esd_work, mipid_esd_work);
	mutex_init(&md->mutex);

	md->enabled = panel_enabled(md);

	if (md->enabled)
		mipid_esd_start_check(md);
	else
		md->saved_bklight_level = mipid_get_bklight_level(panel);

	return 0;
}

static void mipid_cleanup(struct lcd_panel *panel)
{
	struct mipid_device *md = to_mipid_device(panel);

	if (md->enabled)
		mipid_esd_stop_check(md);
	destroy_workqueue(md->esd_wq);
}

static struct lcd_panel mipid_panel = {
	.config		= OMAP_LCDC_PANEL_TFT,

	.bpp		= 16,
	.x_res		= 800,
	.y_res		= 480,
	.pixel_clock	= 21940,
	.hsw		= 50,
	.hfp		= 20,
	.hbp		= 15,
	.vsw		= 2,
	.vfp		= 1,
	.vbp		= 3,

	.init			= mipid_init,
	.cleanup		= mipid_cleanup,
	.enable			= mipid_enable,
	.disable		= mipid_disable,
	.get_caps		= mipid_get_caps,
	.set_bklight_level	= mipid_set_bklight_level,
	.get_bklight_level	= mipid_get_bklight_level,
	.get_bklight_max	= mipid_get_bklight_max,
	.run_test		= mipid_run_test,
};

static int mipid_detect(struct mipid_device *md)
{
	struct mipid_platform_data *pdata;
	u8 display_id[3];

	pdata = md->spi->dev.platform_data;
	if (pdata == NULL) {
		dev_err(&md->spi->dev, "missing platform data\n");
		return -ENOENT;
	}

	mipid_read(md, MIPID_CMD_READ_DISP_ID, display_id, 3);
	dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n",
		display_id[0], display_id[1], display_id[2]);

	switch (display_id[0]) {
	case 0x45:
		md->panel.name = "lph8923";
		break;
	case 0x83:
		md->panel.name = "ls041y3";
		md->esd_check = ls041y3_esd_check;
		break;
	default:
		md->panel.name = "unknown";
		dev_err(&md->spi->dev, "invalid display ID\n");
		return -ENODEV;
	}

	md->revision = display_id[1];
	md->panel.data_lines = pdata->data_lines;
	pr_info("omapfb: %s rev %02x LCD detected, %d data lines\n",
			md->panel.name, md->revision, md->panel.data_lines);

	return 0;
}

static int mipid_spi_probe(struct spi_device *spi)
{
	struct mipid_device *md;
	int r;

	md = kzalloc(sizeof(*md), GFP_KERNEL);
	if (md == NULL) {
		dev_err(&spi->dev, "out of memory\n");
		return -ENOMEM;
	}

	spi->mode = SPI_MODE_0;
	md->spi = spi;
	dev_set_drvdata(&spi->dev, md);
	md->panel = mipid_panel;

	r = mipid_detect(md);
	if (r < 0)
		return r;

	omapfb_register_panel(&md->panel);

	return 0;
}

static int mipid_spi_remove(struct spi_device *spi)
{
	struct mipid_device *md = dev_get_drvdata(&spi->dev);

	mipid_disable(&md->panel);
	kfree(md);

	return 0;
}

static struct spi_driver mipid_spi_driver = {
	.driver = {
		.name	= MIPID_MODULE_NAME,
		.bus	= &spi_bus_type,
		.owner	= THIS_MODULE,
	},
	.probe	= mipid_spi_probe,
	.remove	= __devexit_p(mipid_spi_remove),
};

static int mipid_drv_init(void)
{
	spi_register_driver(&mipid_spi_driver);

	return 0;
}
module_init(mipid_drv_init);

static void mipid_drv_cleanup(void)
{
	spi_unregister_driver(&mipid_spi_driver);
}
module_exit(mipid_drv_cleanup);

MODULE_DESCRIPTION("MIPI display driver");
MODULE_LICENSE("GPL");