summaryrefslogtreecommitdiffstats
path: root/drivers/video/exynos/exynos_mipi_dsi_common.c
blob: 7eed957b6014eb09dc2262c47d28b813d21b21ed (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
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
/* linux/drivers/video/exynos/exynos_mipi_dsi_common.c
 *
 * Samsung SoC MIPI-DSI common driver.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd
 *
 * InKi Dae, <inki.dae@samsung.com>
 * Donghwa Lee, <dh09.lee@samsung.com>
 *
 * 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.
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/ctype.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/memory.h>
#include <linux/delay.h>
#include <linux/irqreturn.h>
#include <linux/kthread.h>

#include <video/mipi_display.h>
#include <video/exynos_mipi_dsim.h>

#include "exynos_mipi_dsi_regs.h"
#include "exynos_mipi_dsi_lowlevel.h"
#include "exynos_mipi_dsi_common.h"

#define MIPI_FIFO_TIMEOUT	msecs_to_jiffies(250)
#define MIPI_RX_FIFO_READ_DONE  0x30800002
#define MIPI_MAX_RX_FIFO        20
#define MHZ			(1000 * 1000)
#define FIN_HZ			(24 * MHZ)

#define DFIN_PLL_MIN_HZ		(6 * MHZ)
#define DFIN_PLL_MAX_HZ		(12 * MHZ)

#define DFVCO_MIN_HZ		(500 * MHZ)
#define DFVCO_MAX_HZ		(1000 * MHZ)

#define TRY_GET_FIFO_TIMEOUT	(5000 * 2)
#define TRY_FIFO_CLEAR		(10)

/* MIPI-DSIM status types. */
enum {
	DSIM_STATE_INIT,	/* should be initialized. */
	DSIM_STATE_STOP,	/* CPU and LCDC are LP mode. */
	DSIM_STATE_HSCLKEN,	/* HS clock was enabled. */
	DSIM_STATE_ULPS
};

/* define DSI lane types. */
enum {
	DSIM_LANE_CLOCK = (1 << 0),
	DSIM_LANE_DATA0 = (1 << 1),
	DSIM_LANE_DATA1 = (1 << 2),
	DSIM_LANE_DATA2 = (1 << 3),
	DSIM_LANE_DATA3 = (1 << 4)
};

static unsigned int dpll_table[15] = {
	100, 120, 170, 220, 270,
	320, 390, 450, 510, 560,
	640, 690, 770, 870, 950
};

irqreturn_t exynos_mipi_dsi_interrupt_handler(int irq, void *dev_id)
{
	struct mipi_dsim_device *dsim = dev_id;
	unsigned int intsrc, intmsk;

	intsrc = exynos_mipi_dsi_read_interrupt(dsim);
	intmsk = exynos_mipi_dsi_read_interrupt_mask(dsim);
	intmsk = ~intmsk & intsrc;

	if (intsrc & INTMSK_RX_DONE) {
		complete(&dsim_rd_comp);
		dev_dbg(dsim->dev, "MIPI INTMSK_RX_DONE\n");
	}
	if (intsrc & INTMSK_FIFO_EMPTY) {
		complete(&dsim_wr_comp);
		dev_dbg(dsim->dev, "MIPI INTMSK_FIFO_EMPTY\n");
	}

	exynos_mipi_dsi_clear_interrupt(dsim, intmsk);

	return IRQ_HANDLED;
}

/*
 * write long packet to mipi dsi slave
 * @dsim: mipi dsim device structure.
 * @data0: packet data to send.
 * @data1: size of packet data
 */
static void exynos_mipi_dsi_long_data_wr(struct mipi_dsim_device *dsim,
		const unsigned char *data0, unsigned int data_size)
{
	unsigned int data_cnt = 0, payload = 0;

	/* in case that data count is more then 4 */
	for (data_cnt = 0; data_cnt < data_size; data_cnt += 4) {
		/*
		 * after sending 4bytes per one time,
		 * send remainder data less then 4.
		 */
		if ((data_size - data_cnt) < 4) {
			if ((data_size - data_cnt) == 3) {
				payload = data0[data_cnt] |
				    data0[data_cnt + 1] << 8 |
					data0[data_cnt + 2] << 16;
			dev_dbg(dsim->dev, "count = 3 payload = %x, %x %x %x\n",
				payload, data0[data_cnt],
				data0[data_cnt + 1],
				data0[data_cnt + 2]);
			} else if ((data_size - data_cnt) == 2) {
				payload = data0[data_cnt] |
					data0[data_cnt + 1] << 8;
			dev_dbg(dsim->dev,
				"count = 2 payload = %x, %x %x\n", payload,
				data0[data_cnt],
				data0[data_cnt + 1]);
			} else if ((data_size - data_cnt) == 1) {
				payload = data0[data_cnt];
			}

			exynos_mipi_dsi_wr_tx_data(dsim, payload);
		/* send 4bytes per one time. */
		} else {
			payload = data0[data_cnt] |
				data0[data_cnt + 1] << 8 |
				data0[data_cnt + 2] << 16 |
				data0[data_cnt + 3] << 24;

			dev_dbg(dsim->dev,
				"count = 4 payload = %x, %x %x %x %x\n",
				payload, *(u8 *)(data0 + data_cnt),
				data0[data_cnt + 1],
				data0[data_cnt + 2],
				data0[data_cnt + 3]);

			exynos_mipi_dsi_wr_tx_data(dsim, payload);
		}
	}
}

int exynos_mipi_dsi_wr_data(struct mipi_dsim_device *dsim, unsigned int data_id,
	const unsigned char *data0, unsigned int data_size)
{
	unsigned int check_rx_ack = 0;

	if (dsim->state == DSIM_STATE_ULPS) {
		dev_err(dsim->dev, "state is ULPS.\n");

		return -EINVAL;
	}

	/* FIXME!!! why does it need this delay? */
	msleep(20);

	mutex_lock(&dsim->lock);

	switch (data_id) {
	/* short packet types of packet types for command. */
	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
	case MIPI_DSI_DCS_SHORT_WRITE:
	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
		if (check_rx_ack) {
			/* process response func should be implemented */
			mutex_unlock(&dsim->lock);
			return 0;
		} else {
			mutex_unlock(&dsim->lock);
			return -EINVAL;
		}

	/* general command */
	case MIPI_DSI_COLOR_MODE_OFF:
	case MIPI_DSI_COLOR_MODE_ON:
	case MIPI_DSI_SHUTDOWN_PERIPHERAL:
	case MIPI_DSI_TURN_ON_PERIPHERAL:
		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
		if (check_rx_ack) {
			/* process response func should be implemented. */
			mutex_unlock(&dsim->lock);
			return 0;
		} else {
			mutex_unlock(&dsim->lock);
			return -EINVAL;
		}

	/* packet types for video data */
	case MIPI_DSI_V_SYNC_START:
	case MIPI_DSI_V_SYNC_END:
	case MIPI_DSI_H_SYNC_START:
	case MIPI_DSI_H_SYNC_END:
	case MIPI_DSI_END_OF_TRANSMISSION:
		mutex_unlock(&dsim->lock);
		return 0;

	/* long packet type and null packet */
	case MIPI_DSI_NULL_PACKET:
	case MIPI_DSI_BLANKING_PACKET:
		mutex_unlock(&dsim->lock);
		return 0;
	case MIPI_DSI_GENERIC_LONG_WRITE:
	case MIPI_DSI_DCS_LONG_WRITE:
	{
		unsigned int size, payload = 0;
		INIT_COMPLETION(dsim_wr_comp);

		size = data_size * 4;

		/* if data count is less then 4, then send 3bytes data.  */
		if (data_size < 4) {
			payload = data0[0] |
				data0[1] << 8 |
				data0[2] << 16;

			exynos_mipi_dsi_wr_tx_data(dsim, payload);

			dev_dbg(dsim->dev, "count = %d payload = %x,%x %x %x\n",
				data_size, payload, data0[0],
				data0[1], data0[2]);

		/* in case that data count is more then 4 */
		} else
			exynos_mipi_dsi_long_data_wr(dsim, data0, data_size);

		/* put data into header fifo */
		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data_size & 0xff,
			(data_size & 0xff00) >> 8);

		if (!wait_for_completion_interruptible_timeout(&dsim_wr_comp,
							MIPI_FIFO_TIMEOUT)) {
			dev_warn(dsim->dev, "command write timeout.\n");
			mutex_unlock(&dsim->lock);
			return -EAGAIN;
		}

		if (check_rx_ack) {
			/* process response func should be implemented. */
			mutex_unlock(&dsim->lock);
			return 0;
		} else {
			mutex_unlock(&dsim->lock);
			return -EINVAL;
		}
	}

	/* packet typo for video data */
	case MIPI_DSI_PACKED_PIXEL_STREAM_16:
	case MIPI_DSI_PACKED_PIXEL_STREAM_18:
	case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
	case MIPI_DSI_PACKED_PIXEL_STREAM_24:
		if (check_rx_ack) {
			/* process response func should be implemented. */
			mutex_unlock(&dsim->lock);
			return 0;
		} else {
			mutex_unlock(&dsim->lock);
			return -EINVAL;
		}
	default:
		dev_warn(dsim->dev,
			"data id %x is not supported current DSI spec.\n",
			data_id);

		mutex_unlock(&dsim->lock);
		return -EINVAL;
	}
}

static unsigned int exynos_mipi_dsi_long_data_rd(struct mipi_dsim_device *dsim,
		unsigned int req_size, unsigned int rx_data, u8 *rx_buf)
{
	unsigned int rcv_pkt, i, j;
	u16 rxsize;

	/* for long packet */
	rxsize = (u16)((rx_data & 0x00ffff00) >> 8);
	dev_dbg(dsim->dev, "mipi dsi rx size : %d\n", rxsize);
	if (rxsize != req_size) {
		dev_dbg(dsim->dev,
			"received size mismatch received: %d, requested: %d\n",
			rxsize, req_size);
		goto err;
	}

	for (i = 0; i < (rxsize >> 2); i++) {
		rcv_pkt = exynos_mipi_dsi_rd_rx_fifo(dsim);
		dev_dbg(dsim->dev, "received pkt : %08x\n", rcv_pkt);
		for (j = 0; j < 4; j++) {
			rx_buf[(i * 4) + j] =
					(u8)(rcv_pkt >> (j * 8)) & 0xff;
			dev_dbg(dsim->dev, "received value : %02x\n",
					(rcv_pkt >> (j * 8)) & 0xff);
		}
	}
	if (rxsize % 4) {
		rcv_pkt = exynos_mipi_dsi_rd_rx_fifo(dsim);
		dev_dbg(dsim->dev, "received pkt : %08x\n", rcv_pkt);
		for (j = 0; j < (rxsize % 4); j++) {
			rx_buf[(i * 4) + j] =
					(u8)(rcv_pkt >> (j * 8)) & 0xff;
			dev_dbg(dsim->dev, "received value : %02x\n",
					(rcv_pkt >> (j * 8)) & 0xff);
		}
	}

	return rxsize;

err:
	return -EINVAL;
}

static unsigned int exynos_mipi_dsi_response_size(unsigned int req_size)
{
	switch (req_size) {
	case 1:
		return MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE;
	case 2:
		return MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE;
	default:
		return MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE;
	}
}

int exynos_mipi_dsi_rd_data(struct mipi_dsim_device *dsim, unsigned int data_id,
	unsigned int data0, unsigned int req_size, u8 *rx_buf)
{
	unsigned int rx_data, rcv_pkt, i;
	u8 response = 0;
	u16 rxsize;

	if (dsim->state == DSIM_STATE_ULPS) {
		dev_err(dsim->dev, "state is ULPS.\n");

		return -EINVAL;
	}

	/* FIXME!!! */
	msleep(20);

	mutex_lock(&dsim->lock);
	INIT_COMPLETION(dsim_rd_comp);
	exynos_mipi_dsi_rd_tx_header(dsim,
		MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE, req_size);

	response = exynos_mipi_dsi_response_size(req_size);

	switch (data_id) {
	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
	case MIPI_DSI_DCS_READ:
		exynos_mipi_dsi_rd_tx_header(dsim,
			data_id, data0);
		/* process response func should be implemented. */
		break;
	default:
		dev_warn(dsim->dev,
			"data id %x is not supported current DSI spec.\n",
			data_id);

		mutex_unlock(&dsim->lock);
		return -EINVAL;
	}

	if (!wait_for_completion_interruptible_timeout(&dsim_rd_comp,
				MIPI_FIFO_TIMEOUT)) {
		pr_err("RX done interrupt timeout\n");
		mutex_unlock(&dsim->lock);
		return 0;
	}

	msleep(20);

	rx_data = exynos_mipi_dsi_rd_rx_fifo(dsim);

	if ((u8)(rx_data & 0xff) != response) {
		printk(KERN_ERR
			"mipi dsi wrong response rx_data : %x, response:%x\n",
			rx_data, response);
		goto clear_rx_fifo;
	}

	if (req_size <= 2) {
		/* for short packet */
		for (i = 0; i < req_size; i++)
			rx_buf[i] = (rx_data >> (8 + (i * 8))) & 0xff;
		rxsize = req_size;
	} else {
		/* for long packet */
		rxsize = exynos_mipi_dsi_long_data_rd(dsim, req_size, rx_data,
							rx_buf);
		if (rxsize != req_size)
			goto clear_rx_fifo;
	}

	rcv_pkt = exynos_mipi_dsi_rd_rx_fifo(dsim);

	msleep(20);

	if (rcv_pkt != MIPI_RX_FIFO_READ_DONE) {
		dev_info(dsim->dev,
			"Can't found RX FIFO READ DONE FLAG : %x\n", rcv_pkt);
		goto clear_rx_fifo;
	}

	mutex_unlock(&dsim->lock);

	return rxsize;

clear_rx_fifo:
	i = 0;
	while (1) {
		rcv_pkt = exynos_mipi_dsi_rd_rx_fifo(dsim);
		if ((rcv_pkt == MIPI_RX_FIFO_READ_DONE)
				|| (i > MIPI_MAX_RX_FIFO))
			break;
		dev_dbg(dsim->dev,
				"mipi dsi clear rx fifo : %08x\n", rcv_pkt);
		i++;
	}
	dev_info(dsim->dev,
		"mipi dsi rx done count : %d, rcv_pkt : %08x\n", i, rcv_pkt);

	mutex_unlock(&dsim->lock);

	return 0;
}

static int exynos_mipi_dsi_pll_on(struct mipi_dsim_device *dsim,
				unsigned int enable)
{
	int sw_timeout;

	if (enable) {
		sw_timeout = 1000;

		exynos_mipi_dsi_enable_pll(dsim, 1);
		while (1) {
			sw_timeout--;
			if (exynos_mipi_dsi_is_pll_stable(dsim))
				return 0;
			if (sw_timeout == 0)
				return -EINVAL;
		}
	} else
		exynos_mipi_dsi_enable_pll(dsim, 0);

	return 0;
}

static unsigned long exynos_mipi_dsi_change_pll(struct mipi_dsim_device *dsim,
	unsigned int pre_divider, unsigned int main_divider,
	unsigned int scaler)
{
	unsigned long dfin_pll, dfvco, dpll_out;
	unsigned int i, freq_band = 0xf;

	dfin_pll = (FIN_HZ / pre_divider);

	/******************************************************
	 *	Serial Clock(=ByteClk X 8)	FreqBand[3:0] *
	 ******************************************************
	 *	~ 99.99 MHz			0000
	 *	100 ~ 119.99 MHz		0001
	 *	120 ~ 159.99 MHz		0010
	 *	160 ~ 199.99 MHz		0011
	 *	200 ~ 239.99 MHz		0100
	 *	140 ~ 319.99 MHz		0101
	 *	320 ~ 389.99 MHz		0110
	 *	390 ~ 449.99 MHz		0111
	 *	450 ~ 509.99 MHz		1000
	 *	510 ~ 559.99 MHz		1001
	 *	560 ~ 639.99 MHz		1010
	 *	640 ~ 689.99 MHz		1011
	 *	690 ~ 769.99 MHz		1100
	 *	770 ~ 869.99 MHz		1101
	 *	870 ~ 949.99 MHz		1110
	 *	950 ~ 1000 MHz			1111
	 ******************************************************/
	if (dfin_pll < DFIN_PLL_MIN_HZ || dfin_pll > DFIN_PLL_MAX_HZ) {
		dev_warn(dsim->dev, "fin_pll range should be 6MHz ~ 12MHz\n");
		exynos_mipi_dsi_enable_afc(dsim, 0, 0);
	} else {
		if (dfin_pll < 7 * MHZ)
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x1);
		else if (dfin_pll < 8 * MHZ)
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x0);
		else if (dfin_pll < 9 * MHZ)
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x3);
		else if (dfin_pll < 10 * MHZ)
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x2);
		else if (dfin_pll < 11 * MHZ)
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x5);
		else
			exynos_mipi_dsi_enable_afc(dsim, 1, 0x4);
	}

	dfvco = dfin_pll * main_divider;
	dev_dbg(dsim->dev, "dfvco = %lu, dfin_pll = %lu, main_divider = %d\n",
				dfvco, dfin_pll, main_divider);
	if (dfvco < DFVCO_MIN_HZ || dfvco > DFVCO_MAX_HZ)
		dev_warn(dsim->dev, "fvco range should be 500MHz ~ 1000MHz\n");

	dpll_out = dfvco / (1 << scaler);
	dev_dbg(dsim->dev, "dpll_out = %lu, dfvco = %lu, scaler = %d\n",
		dpll_out, dfvco, scaler);

	for (i = 0; i < ARRAY_SIZE(dpll_table); i++) {
		if (dpll_out < dpll_table[i] * MHZ) {
			freq_band = i;
			break;
		}
	}

	dev_dbg(dsim->dev, "freq_band = %d\n", freq_band);

	exynos_mipi_dsi_pll_freq(dsim, pre_divider, main_divider, scaler);

	exynos_mipi_dsi_hs_zero_ctrl(dsim, 0);
	exynos_mipi_dsi_prep_ctrl(dsim, 0);

	/* Freq Band */
	exynos_mipi_dsi_pll_freq_band(dsim, freq_band);

	/* Stable time */
	exynos_mipi_dsi_pll_stable_time(dsim, dsim->dsim_config->pll_stable_time);

	/* Enable PLL */
	dev_dbg(dsim->dev, "FOUT of mipi dphy pll is %luMHz\n",
		(dpll_out / MHZ));

	return dpll_out;
}

static int exynos_mipi_dsi_set_clock(struct mipi_dsim_device *dsim,
	unsigned int byte_clk_sel, unsigned int enable)
{
	unsigned int esc_div;
	unsigned long esc_clk_error_rate;
	unsigned long hs_clk = 0, byte_clk = 0, escape_clk = 0;

	if (enable) {
		dsim->e_clk_src = byte_clk_sel;

		/* Escape mode clock and byte clock source */
		exynos_mipi_dsi_set_byte_clock_src(dsim, byte_clk_sel);

		/* DPHY, DSIM Link : D-PHY clock out */
		if (byte_clk_sel == DSIM_PLL_OUT_DIV8) {
			hs_clk = exynos_mipi_dsi_change_pll(dsim,
				dsim->dsim_config->p, dsim->dsim_config->m,
				dsim->dsim_config->s);
			if (hs_clk == 0) {
				dev_err(dsim->dev,
					"failed to get hs clock.\n");
				return -EINVAL;
			}

			byte_clk = hs_clk / 8;
			exynos_mipi_dsi_enable_pll_bypass(dsim, 0);
			exynos_mipi_dsi_pll_on(dsim, 1);
		/* DPHY : D-PHY clock out, DSIM link : external clock out */
		} else if (byte_clk_sel == DSIM_EXT_CLK_DIV8) {
			dev_warn(dsim->dev, "this project is not support\n");
			dev_warn(dsim->dev,
				"external clock source for MIPI DSIM.\n");
		} else if (byte_clk_sel == DSIM_EXT_CLK_BYPASS) {
			dev_warn(dsim->dev, "this project is not support\n");
			dev_warn(dsim->dev,
				"external clock source for MIPI DSIM\n");
		}

		/* escape clock divider */
		esc_div = byte_clk / (dsim->dsim_config->esc_clk);
		dev_dbg(dsim->dev,
			"esc_div = %d, byte_clk = %lu, esc_clk = %lu\n",
			esc_div, byte_clk, dsim->dsim_config->esc_clk);
		if ((byte_clk / esc_div) >= (20 * MHZ) ||
				(byte_clk / esc_div) >
					dsim->dsim_config->esc_clk)
			esc_div += 1;

		escape_clk = byte_clk / esc_div;
		dev_dbg(dsim->dev,
			"escape_clk = %lu, byte_clk = %lu, esc_div = %d\n",
			escape_clk, byte_clk, esc_div);

		/* enable escape clock. */
		exynos_mipi_dsi_enable_byte_clock(dsim, 1);

		/* enable byte clk and escape clock */
		exynos_mipi_dsi_set_esc_clk_prs(dsim, 1, esc_div);
		/* escape clock on lane */
		exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
			(DSIM_LANE_CLOCK | dsim->data_lane), 1);

		dev_dbg(dsim->dev, "byte clock is %luMHz\n",
			(byte_clk / MHZ));
		dev_dbg(dsim->dev, "escape clock that user's need is %lu\n",
			(dsim->dsim_config->esc_clk / MHZ));
		dev_dbg(dsim->dev, "escape clock divider is %x\n", esc_div);
		dev_dbg(dsim->dev, "escape clock is %luMHz\n",
			((byte_clk / esc_div) / MHZ));

		if ((byte_clk / esc_div) > escape_clk) {
			esc_clk_error_rate = escape_clk /
				(byte_clk / esc_div);
			dev_warn(dsim->dev, "error rate is %lu over.\n",
				(esc_clk_error_rate / 100));
		} else if ((byte_clk / esc_div) < (escape_clk)) {
			esc_clk_error_rate = (byte_clk / esc_div) /
				escape_clk;
			dev_warn(dsim->dev, "error rate is %lu under.\n",
				(esc_clk_error_rate / 100));
		}
	} else {
		exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
			(DSIM_LANE_CLOCK | dsim->data_lane), 0);
		exynos_mipi_dsi_set_esc_clk_prs(dsim, 0, 0);

		/* disable escape clock. */
		exynos_mipi_dsi_enable_byte_clock(dsim, 0);

		if (byte_clk_sel == DSIM_PLL_OUT_DIV8)
			exynos_mipi_dsi_pll_on(dsim, 0);
	}

	return 0;
}

int exynos_mipi_dsi_init_dsim(struct mipi_dsim_device *dsim)
{
	dsim->state = DSIM_STATE_INIT;

	switch (dsim->dsim_config->e_no_data_lane) {
	case DSIM_DATA_LANE_1:
		dsim->data_lane = DSIM_LANE_DATA0;
		break;
	case DSIM_DATA_LANE_2:
		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1;
		break;
	case DSIM_DATA_LANE_3:
		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1 |
			DSIM_LANE_DATA2;
		break;
	case DSIM_DATA_LANE_4:
		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1 |
			DSIM_LANE_DATA2 | DSIM_LANE_DATA3;
		break;
	default:
		dev_info(dsim->dev, "data lane is invalid.\n");
		return -EINVAL;
	}

	exynos_mipi_dsi_sw_reset(dsim);
	exynos_mipi_dsi_func_reset(dsim);

	exynos_mipi_dsi_dp_dn_swap(dsim, 0);

	return 0;
}

void exynos_mipi_dsi_init_interrupt(struct mipi_dsim_device *dsim)
{
	unsigned int src = 0;

	src = (INTSRC_SFR_FIFO_EMPTY | INTSRC_RX_DATA_DONE);
	exynos_mipi_dsi_set_interrupt(dsim, src, 1);

	src = 0;
	src = ~(INTMSK_RX_DONE | INTMSK_FIFO_EMPTY);
	exynos_mipi_dsi_set_interrupt_mask(dsim, src, 1);
}

int exynos_mipi_dsi_enable_frame_done_int(struct mipi_dsim_device *dsim,
	unsigned int enable)
{
	/* enable only frame done interrupt */
	exynos_mipi_dsi_set_interrupt_mask(dsim, INTMSK_FRAME_DONE, enable);

	return 0;
}

void exynos_mipi_dsi_stand_by(struct mipi_dsim_device *dsim,
		unsigned int enable)
{

	/* consider Main display and Sub display. */

	exynos_mipi_dsi_set_main_stand_by(dsim, enable);
}

int exynos_mipi_dsi_set_display_mode(struct mipi_dsim_device *dsim,
	struct mipi_dsim_config *dsim_config)
{
	struct mipi_dsim_platform_data *dsim_pd;
	struct fb_videomode *timing;

	dsim_pd = (struct mipi_dsim_platform_data *)dsim->pd;
	timing = (struct fb_videomode *)dsim_pd->lcd_panel_info;

	/* in case of VIDEO MODE (RGB INTERFACE), it sets polarities. */
	if (dsim_config->e_interface == (u32) DSIM_VIDEO) {
		if (dsim_config->auto_vertical_cnt == 0) {
			exynos_mipi_dsi_set_main_disp_vporch(dsim,
				dsim_config->cmd_allow,
				timing->lower_margin,
				timing->upper_margin);
			exynos_mipi_dsi_set_main_disp_hporch(dsim,
				timing->right_margin,
				timing->left_margin);
			exynos_mipi_dsi_set_main_disp_sync_area(dsim,
				timing->vsync_len,
				timing->hsync_len);
		}
	}

	exynos_mipi_dsi_set_main_disp_resol(dsim, timing->xres,
			timing->yres);

	exynos_mipi_dsi_display_config(dsim, dsim_config);

	dev_info(dsim->dev, "lcd panel ==> width = %d, height = %d\n",
			timing->xres, timing->yres);

	return 0;
}

int exynos_mipi_dsi_init_link(struct mipi_dsim_device *dsim)
{
	unsigned int time_out = 100;

	switch (dsim->state) {
	case DSIM_STATE_INIT:
		exynos_mipi_dsi_init_fifo_pointer(dsim, 0x1f);

		/* dsi configuration */
		exynos_mipi_dsi_init_config(dsim);
		exynos_mipi_dsi_enable_lane(dsim, DSIM_LANE_CLOCK, 1);
		exynos_mipi_dsi_enable_lane(dsim, dsim->data_lane, 1);

		/* set clock configuration */
		exynos_mipi_dsi_set_clock(dsim, dsim->dsim_config->e_byte_clk, 1);

		/* check clock and data lane state are stop state */
		while (!(exynos_mipi_dsi_is_lane_state(dsim))) {
			time_out--;
			if (time_out == 0) {
				dev_err(dsim->dev,
					"DSI Master is not stop state.\n");
				dev_err(dsim->dev,
					"Check initialization process\n");

				return -EINVAL;
			}
		}
		if (time_out != 0) {
			dev_info(dsim->dev,
				"DSI Master driver has been completed.\n");
			dev_info(dsim->dev, "DSI Master state is stop state\n");
		}

		dsim->state = DSIM_STATE_STOP;

		/* BTA sequence counters */
		exynos_mipi_dsi_set_stop_state_counter(dsim,
			dsim->dsim_config->stop_holding_cnt);
		exynos_mipi_dsi_set_bta_timeout(dsim,
			dsim->dsim_config->bta_timeout);
		exynos_mipi_dsi_set_lpdr_timeout(dsim,
			dsim->dsim_config->rx_timeout);

		return 0;
	default:
		dev_info(dsim->dev, "DSI Master is already init.\n");
		return 0;
	}

	return 0;
}

int exynos_mipi_dsi_set_hs_enable(struct mipi_dsim_device *dsim)
{
	if (dsim->state != DSIM_STATE_STOP) {
		dev_warn(dsim->dev, "DSIM is not in stop state.\n");
		return 0;
	}

	if (dsim->e_clk_src == DSIM_EXT_CLK_BYPASS) {
		dev_warn(dsim->dev, "clock source is external bypass.\n");
		return 0;
	}

	dsim->state = DSIM_STATE_HSCLKEN;

	 /* set LCDC and CPU transfer mode to HS. */
	exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
	exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);
	exynos_mipi_dsi_enable_hs_clock(dsim, 1);

	return 0;
}

int exynos_mipi_dsi_set_data_transfer_mode(struct mipi_dsim_device *dsim,
		unsigned int mode)
{
	if (mode) {
		if (dsim->state != DSIM_STATE_HSCLKEN) {
			dev_err(dsim->dev, "HS Clock lane is not enabled.\n");
			return -EINVAL;
		}

		exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
	} else {
		if (dsim->state == DSIM_STATE_INIT || dsim->state ==
			DSIM_STATE_ULPS) {
			dev_err(dsim->dev,
				"DSI Master is not STOP or HSDT state.\n");
			return -EINVAL;
		}

		exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);
	}

	return 0;
}

int exynos_mipi_dsi_get_frame_done_status(struct mipi_dsim_device *dsim)
{
	return _exynos_mipi_dsi_get_frame_done_status(dsim);
}

int exynos_mipi_dsi_clear_frame_done(struct mipi_dsim_device *dsim)
{
	_exynos_mipi_dsi_clear_frame_done(dsim);

	return 0;
}

int exynos_mipi_dsi_fifo_clear(struct mipi_dsim_device *dsim,
				unsigned int val)
{
	int try = TRY_FIFO_CLEAR;

	exynos_mipi_dsi_sw_reset_release(dsim);
	exynos_mipi_dsi_func_reset(dsim);

	do {
		if (exynos_mipi_dsi_get_sw_reset_release(dsim)) {
			exynos_mipi_dsi_init_interrupt(dsim);
			dev_dbg(dsim->dev, "reset release done.\n");
			return 0;
		}
	} while (--try);

	dev_err(dsim->dev, "failed to clear dsim fifo.\n");
	return -EAGAIN;
}

MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samusung SoC MIPI-DSI common driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud