summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/tegra/dsi.c
blob: 0e599f0417c06869e5b1f2bdd296914dd10f0d75 (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
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
/*
 * Copyright (C) 2013 NVIDIA Corporation
 *
 * 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/clk.h>
#include <linux/debugfs.h>
#include <linux/host1x.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

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

#include <video/mipi_display.h>

#include "dc.h"
#include "drm.h"
#include "dsi.h"
#include "mipi-phy.h"

#define DSI_VIDEO_FIFO_DEPTH (1920 / 4)
#define DSI_HOST_FIFO_DEPTH 64

struct tegra_dsi {
	struct host1x_client client;
	struct tegra_output output;
	struct device *dev;

	void __iomem *regs;

	struct reset_control *rst;
	struct clk *clk_parent;
	struct clk *clk_lp;
	struct clk *clk;

	struct drm_info_list *debugfs_files;
	struct drm_minor *minor;
	struct dentry *debugfs;

	enum mipi_dsi_pixel_format format;
	unsigned int lanes;

	struct tegra_mipi_device *mipi;
	struct mipi_dsi_host host;
};

static inline struct tegra_dsi *
host1x_client_to_dsi(struct host1x_client *client)
{
	return container_of(client, struct tegra_dsi, client);
}

static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host)
{
	return container_of(host, struct tegra_dsi, host);
}

static inline struct tegra_dsi *to_dsi(struct tegra_output *output)
{
	return container_of(output, struct tegra_dsi, output);
}

static inline unsigned long tegra_dsi_readl(struct tegra_dsi *dsi,
					    unsigned long reg)
{
	return readl(dsi->regs + (reg << 2));
}

static inline void tegra_dsi_writel(struct tegra_dsi *dsi, unsigned long value,
				    unsigned long reg)
{
	writel(value, dsi->regs + (reg << 2));
}

static int tegra_dsi_show_regs(struct seq_file *s, void *data)
{
	struct drm_info_node *node = s->private;
	struct tegra_dsi *dsi = node->info_ent->data;

#define DUMP_REG(name)						\
	seq_printf(s, "%-32s %#05x %08lx\n", #name, name,	\
		   tegra_dsi_readl(dsi, name))

	DUMP_REG(DSI_INCR_SYNCPT);
	DUMP_REG(DSI_INCR_SYNCPT_CONTROL);
	DUMP_REG(DSI_INCR_SYNCPT_ERROR);
	DUMP_REG(DSI_CTXSW);
	DUMP_REG(DSI_RD_DATA);
	DUMP_REG(DSI_WR_DATA);
	DUMP_REG(DSI_POWER_CONTROL);
	DUMP_REG(DSI_INT_ENABLE);
	DUMP_REG(DSI_INT_STATUS);
	DUMP_REG(DSI_INT_MASK);
	DUMP_REG(DSI_HOST_CONTROL);
	DUMP_REG(DSI_CONTROL);
	DUMP_REG(DSI_SOL_DELAY);
	DUMP_REG(DSI_MAX_THRESHOLD);
	DUMP_REG(DSI_TRIGGER);
	DUMP_REG(DSI_TX_CRC);
	DUMP_REG(DSI_STATUS);

	DUMP_REG(DSI_INIT_SEQ_CONTROL);
	DUMP_REG(DSI_INIT_SEQ_DATA_0);
	DUMP_REG(DSI_INIT_SEQ_DATA_1);
	DUMP_REG(DSI_INIT_SEQ_DATA_2);
	DUMP_REG(DSI_INIT_SEQ_DATA_3);
	DUMP_REG(DSI_INIT_SEQ_DATA_4);
	DUMP_REG(DSI_INIT_SEQ_DATA_5);
	DUMP_REG(DSI_INIT_SEQ_DATA_6);
	DUMP_REG(DSI_INIT_SEQ_DATA_7);

	DUMP_REG(DSI_PKT_SEQ_0_LO);
	DUMP_REG(DSI_PKT_SEQ_0_HI);
	DUMP_REG(DSI_PKT_SEQ_1_LO);
	DUMP_REG(DSI_PKT_SEQ_1_HI);
	DUMP_REG(DSI_PKT_SEQ_2_LO);
	DUMP_REG(DSI_PKT_SEQ_2_HI);
	DUMP_REG(DSI_PKT_SEQ_3_LO);
	DUMP_REG(DSI_PKT_SEQ_3_HI);
	DUMP_REG(DSI_PKT_SEQ_4_LO);
	DUMP_REG(DSI_PKT_SEQ_4_HI);
	DUMP_REG(DSI_PKT_SEQ_5_LO);
	DUMP_REG(DSI_PKT_SEQ_5_HI);

	DUMP_REG(DSI_DCS_CMDS);

	DUMP_REG(DSI_PKT_LEN_0_1);
	DUMP_REG(DSI_PKT_LEN_2_3);
	DUMP_REG(DSI_PKT_LEN_4_5);
	DUMP_REG(DSI_PKT_LEN_6_7);

	DUMP_REG(DSI_PHY_TIMING_0);
	DUMP_REG(DSI_PHY_TIMING_1);
	DUMP_REG(DSI_PHY_TIMING_2);
	DUMP_REG(DSI_BTA_TIMING);

	DUMP_REG(DSI_TIMEOUT_0);
	DUMP_REG(DSI_TIMEOUT_1);
	DUMP_REG(DSI_TO_TALLY);

	DUMP_REG(DSI_PAD_CONTROL_0);
	DUMP_REG(DSI_PAD_CONTROL_CD);
	DUMP_REG(DSI_PAD_CD_STATUS);
	DUMP_REG(DSI_VIDEO_MODE_CONTROL);
	DUMP_REG(DSI_PAD_CONTROL_1);
	DUMP_REG(DSI_PAD_CONTROL_2);
	DUMP_REG(DSI_PAD_CONTROL_3);
	DUMP_REG(DSI_PAD_CONTROL_4);

	DUMP_REG(DSI_GANGED_MODE_CONTROL);
	DUMP_REG(DSI_GANGED_MODE_START);
	DUMP_REG(DSI_GANGED_MODE_SIZE);

	DUMP_REG(DSI_RAW_DATA_BYTE_COUNT);
	DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL);

	DUMP_REG(DSI_INIT_SEQ_DATA_8);
	DUMP_REG(DSI_INIT_SEQ_DATA_9);
	DUMP_REG(DSI_INIT_SEQ_DATA_10);
	DUMP_REG(DSI_INIT_SEQ_DATA_11);
	DUMP_REG(DSI_INIT_SEQ_DATA_12);
	DUMP_REG(DSI_INIT_SEQ_DATA_13);
	DUMP_REG(DSI_INIT_SEQ_DATA_14);
	DUMP_REG(DSI_INIT_SEQ_DATA_15);

#undef DUMP_REG

	return 0;
}

static struct drm_info_list debugfs_files[] = {
	{ "regs", tegra_dsi_show_regs, 0, NULL },
};

static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi,
				  struct drm_minor *minor)
{
	const char *name = dev_name(dsi->dev);
	unsigned int i;
	int err;

	dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root);
	if (!dsi->debugfs)
		return -ENOMEM;

	dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
				     GFP_KERNEL);
	if (!dsi->debugfs_files) {
		err = -ENOMEM;
		goto remove;
	}

	for (i = 0; i < ARRAY_SIZE(debugfs_files); i++)
		dsi->debugfs_files[i].data = dsi;

	err = drm_debugfs_create_files(dsi->debugfs_files,
				       ARRAY_SIZE(debugfs_files),
				       dsi->debugfs, minor);
	if (err < 0)
		goto free;

	dsi->minor = minor;

	return 0;

free:
	kfree(dsi->debugfs_files);
	dsi->debugfs_files = NULL;
remove:
	debugfs_remove(dsi->debugfs);
	dsi->debugfs = NULL;

	return err;
}

static int tegra_dsi_debugfs_exit(struct tegra_dsi *dsi)
{
	drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files),
				 dsi->minor);
	dsi->minor = NULL;

	kfree(dsi->debugfs_files);
	dsi->debugfs_files = NULL;

	debugfs_remove(dsi->debugfs);
	dsi->debugfs = NULL;

	return 0;
}

#define PKT_ID0(id)	((((id) & 0x3f) <<  3) | (1 <<  9))
#define PKT_LEN0(len)	(((len) & 0x07) <<  0)
#define PKT_ID1(id)	((((id) & 0x3f) << 13) | (1 << 19))
#define PKT_LEN1(len)	(((len) & 0x07) << 10)
#define PKT_ID2(id)	((((id) & 0x3f) << 23) | (1 << 29))
#define PKT_LEN2(len)	(((len) & 0x07) << 20)

#define PKT_LP		(1 << 30)
#define NUM_PKT_SEQ	12

/* non-burst mode with sync-end */
static const u32 pkt_seq_vnb_syne[NUM_PKT_SEQ] = {
	[ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
	       PKT_LP,
	[ 1] = 0,
	[ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
	       PKT_LP,
	[ 3] = 0,
	[ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
	       PKT_LP,
	[ 5] = 0,
	[ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
	[ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
	       PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
	       PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
	[ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) |
	       PKT_LP,
	[ 9] = 0,
	[10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) |
	       PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) |
	       PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0),
	[11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) |
	       PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) |
	       PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4),
};

static int tegra_dsi_set_phy_timing(struct tegra_dsi *dsi)
{
	struct mipi_dphy_timing timing;
	unsigned long value, period;
	long rate;
	int err;

	rate = clk_get_rate(dsi->clk);
	if (rate < 0)
		return rate;

	period = DIV_ROUND_CLOSEST(1000000000UL, rate * 2);

	err = mipi_dphy_timing_get_default(&timing, period);
	if (err < 0)
		return err;

	err = mipi_dphy_timing_validate(&timing, period);
	if (err < 0) {
		dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err);
		return err;
	}

	/*
	 * The D-PHY timing fields below are expressed in byte-clock cycles,
	 * so multiply the period by 8.
	 */
	period *= 8;

	value = DSI_TIMING_FIELD(timing.hsexit, period, 1) << 24 |
		DSI_TIMING_FIELD(timing.hstrail, period, 0) << 16 |
		DSI_TIMING_FIELD(timing.hszero, period, 3) << 8 |
		DSI_TIMING_FIELD(timing.hsprepare, period, 1);
	tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0);

	value = DSI_TIMING_FIELD(timing.clktrail, period, 1) << 24 |
		DSI_TIMING_FIELD(timing.clkpost, period, 1) << 16 |
		DSI_TIMING_FIELD(timing.clkzero, period, 1) << 8 |
		DSI_TIMING_FIELD(timing.lpx, period, 1);
	tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1);

	value = DSI_TIMING_FIELD(timing.clkprepare, period, 1) << 16 |
		DSI_TIMING_FIELD(timing.clkpre, period, 1) << 8 |
		DSI_TIMING_FIELD(0xff * period, period, 0) << 0;
	tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2);

	value = DSI_TIMING_FIELD(timing.taget, period, 1) << 16 |
		DSI_TIMING_FIELD(timing.tasure, period, 1) << 8 |
		DSI_TIMING_FIELD(timing.tago, period, 1);
	tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);

	return 0;
}

static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format,
				unsigned int *mulp, unsigned int *divp)
{
	switch (format) {
	case MIPI_DSI_FMT_RGB666_PACKED:
	case MIPI_DSI_FMT_RGB888:
		*mulp = 3;
		*divp = 1;
		break;

	case MIPI_DSI_FMT_RGB565:
		*mulp = 2;
		*divp = 1;
		break;

	case MIPI_DSI_FMT_RGB666:
		*mulp = 9;
		*divp = 4;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int tegra_output_dsi_enable(struct tegra_output *output)
{
	struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
	struct drm_display_mode *mode = &dc->base.mode;
	unsigned int hact, hsw, hbp, hfp, i, mul, div;
	struct tegra_dsi *dsi = to_dsi(output);
	/* FIXME: don't hardcode this */
	const u32 *pkt_seq = pkt_seq_vnb_syne;
	unsigned long value;
	int err;

	err = tegra_dsi_get_muldiv(dsi->format, &mul, &div);
	if (err < 0)
		return err;

	err = clk_enable(dsi->clk);
	if (err < 0)
		return err;

	reset_control_deassert(dsi->rst);

	value = DSI_CONTROL_CHANNEL(0) | DSI_CONTROL_FORMAT(dsi->format) |
		DSI_CONTROL_LANES(dsi->lanes - 1) |
		DSI_CONTROL_SOURCE(dc->pipe);
	tegra_dsi_writel(dsi, value, DSI_CONTROL);

	tegra_dsi_writel(dsi, DSI_VIDEO_FIFO_DEPTH, DSI_MAX_THRESHOLD);

	value = DSI_HOST_CONTROL_HS | DSI_HOST_CONTROL_CS |
		DSI_HOST_CONTROL_ECC;
	tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);

	value = tegra_dsi_readl(dsi, DSI_CONTROL);
	value |= DSI_CONTROL_HS_CLK_CTRL;
	value &= ~DSI_CONTROL_TX_TRIG(3);
	value &= ~DSI_CONTROL_DCS_ENABLE;
	value |= DSI_CONTROL_VIDEO_ENABLE;
	value &= ~DSI_CONTROL_HOST_ENABLE;
	tegra_dsi_writel(dsi, value, DSI_CONTROL);

	err = tegra_dsi_set_phy_timing(dsi);
	if (err < 0)
		return err;

	for (i = 0; i < NUM_PKT_SEQ; i++)
		tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);

	/* horizontal active pixels */
	hact = mode->hdisplay * mul / div;

	/* horizontal sync width */
	hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
	hsw -= 10;

	/* horizontal back porch */
	hbp = (mode->htotal - mode->hsync_end) * mul / div;
	hbp -= 14;

	/* horizontal front porch */
	hfp = (mode->hsync_start  - mode->hdisplay) * mul / div;
	hfp -= 8;

	tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);
	tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3);
	tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5);
	tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7);

	/* set SOL delay */
	tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY);

	/* enable display controller */
	value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
	value |= DSI_ENABLE;
	tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);

	value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
	value &= ~DISP_CTRL_MODE_MASK;
	value |= DISP_CTRL_MODE_C_DISPLAY;
	tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);

	value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
	value |= PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
		 PW4_ENABLE | PM0_ENABLE | PM1_ENABLE;
	tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);

	tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
	tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);

	/* enable DSI controller */
	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
	value |= DSI_POWER_CONTROL_ENABLE;
	tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);

	return 0;
}

static int tegra_output_dsi_disable(struct tegra_output *output)
{
	struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
	struct tegra_dsi *dsi = to_dsi(output);
	unsigned long value;

	/* disable DSI controller */
	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);
	value &= DSI_POWER_CONTROL_ENABLE;
	tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);

	/*
	 * The following accesses registers of the display controller, so make
	 * sure it's only executed when the output is attached to one.
	 */
	if (dc) {
		value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
		value &= ~(PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
			   PW4_ENABLE | PM0_ENABLE | PM1_ENABLE);
		tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);

		value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
		value &= ~DISP_CTRL_MODE_MASK;
		tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);

		value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS);
		value &= ~DSI_ENABLE;
		tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);

		tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
		tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
	}

	clk_disable(dsi->clk);

	return 0;
}

static int tegra_output_dsi_setup_clock(struct tegra_output *output,
					struct clk *clk, unsigned long pclk)
{
	struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
	struct drm_display_mode *mode = &dc->base.mode;
	unsigned int timeout, mul, div, vrefresh;
	struct tegra_dsi *dsi = to_dsi(output);
	unsigned long bclk, plld, value;
	struct clk *base;
	int err;

	err = tegra_dsi_get_muldiv(dsi->format, &mul, &div);
	if (err < 0)
		return err;

	vrefresh = drm_mode_vrefresh(mode);

	pclk = mode->htotal * mode->vtotal * vrefresh;
	bclk = (pclk * mul) / (div * dsi->lanes);
	plld = DIV_ROUND_UP(bclk * 8, 1000000);
	pclk = (plld * 1000000) / 2;

	err = clk_set_parent(clk, dsi->clk_parent);
	if (err < 0) {
		dev_err(dsi->dev, "failed to set parent clock: %d\n", err);
		return err;
	}

	base = clk_get_parent(dsi->clk_parent);

	/*
	 * This assumes that the parent clock is pll_d_out0 or pll_d2_out
	 * respectively, each of which divides the base pll_d by 2.
	 */
	err = clk_set_rate(base, pclk * 2);
	if (err < 0) {
		dev_err(dsi->dev, "failed to set base clock rate to %lu Hz\n",
			pclk * 2);
		return err;
	}

	/*
	 * XXX: Move the below somewhere else so that we don't need to have
	 * access to the vrefresh in this function?
	 */

	/* one frame high-speed transmission timeout */
	timeout = (bclk / vrefresh) / 512;
	value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout);
	tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0);

	/* 2 ms peripheral timeout for panel */
	timeout = 2 * bclk / 512 * 1000;
	value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000);
	tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1);

	value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0);
	tegra_dsi_writel(dsi, value, DSI_TO_TALLY);

	return 0;
}

static int tegra_output_dsi_check_mode(struct tegra_output *output,
				       struct drm_display_mode *mode,
				       enum drm_mode_status *status)
{
	/*
	 * FIXME: For now, always assume that the mode is okay.
	 */

	*status = MODE_OK;

	return 0;
}

static const struct tegra_output_ops dsi_ops = {
	.enable = tegra_output_dsi_enable,
	.disable = tegra_output_dsi_disable,
	.setup_clock = tegra_output_dsi_setup_clock,
	.check_mode = tegra_output_dsi_check_mode,
};

static int tegra_dsi_pad_enable(struct tegra_dsi *dsi)
{
	unsigned long value;

	value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0);
	tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0);

	return 0;
}

static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi)
{
	unsigned long value;

	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);

	/* start calibration */
	tegra_dsi_pad_enable(dsi);

	value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) |
		DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) |
		DSI_PAD_OUT_CLK(0x0);
	tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2);

	return tegra_mipi_calibrate(dsi->mipi);
}

static int tegra_dsi_init(struct host1x_client *client)
{
	struct tegra_drm *tegra = dev_get_drvdata(client->parent);
	struct tegra_dsi *dsi = host1x_client_to_dsi(client);
	unsigned long value, i;
	int err;

	dsi->output.type = TEGRA_OUTPUT_DSI;
	dsi->output.dev = client->dev;
	dsi->output.ops = &dsi_ops;

	err = tegra_output_init(tegra->drm, &dsi->output);
	if (err < 0) {
		dev_err(client->dev, "output setup failed: %d\n", err);
		return err;
	}

	if (IS_ENABLED(CONFIG_DEBUG_FS)) {
		err = tegra_dsi_debugfs_init(dsi, tegra->drm->primary);
		if (err < 0)
			dev_err(dsi->dev, "debugfs setup failed: %d\n", err);
	}

	/*
	 * enable high-speed mode, checksum generation, ECC generation and
	 * disable raw mode
	 */
	value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL);
	value |= DSI_HOST_CONTROL_ECC | DSI_HOST_CONTROL_CS |
		 DSI_HOST_CONTROL_HS;
	value &= ~DSI_HOST_CONTROL_RAW;
	tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL);

	tegra_dsi_writel(dsi, 0, DSI_SOL_DELAY);
	tegra_dsi_writel(dsi, 0, DSI_MAX_THRESHOLD);

	tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_CONTROL);

	for (i = 0; i < 8; i++) {
		tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_0 + i);
		tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_8 + i);
	}

	for (i = 0; i < 12; i++)
		tegra_dsi_writel(dsi, 0, DSI_PKT_SEQ_0_LO + i);

	tegra_dsi_writel(dsi, 0, DSI_DCS_CMDS);

	err = tegra_dsi_pad_calibrate(dsi);
	if (err < 0) {
		dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
		return err;
	}

	tegra_dsi_writel(dsi, DSI_POWER_CONTROL_ENABLE, DSI_POWER_CONTROL);
	usleep_range(300, 1000);

	return 0;
}

static int tegra_dsi_exit(struct host1x_client *client)
{
	struct tegra_dsi *dsi = host1x_client_to_dsi(client);
	int err;

	if (IS_ENABLED(CONFIG_DEBUG_FS)) {
		err = tegra_dsi_debugfs_exit(dsi);
		if (err < 0)
			dev_err(dsi->dev, "debugfs cleanup failed: %d\n", err);
	}

	err = tegra_output_disable(&dsi->output);
	if (err < 0) {
		dev_err(client->dev, "output failed to disable: %d\n", err);
		return err;
	}

	err = tegra_output_exit(&dsi->output);
	if (err < 0) {
		dev_err(client->dev, "output cleanup failed: %d\n", err);
		return err;
	}

	return 0;
}

static const struct host1x_client_ops dsi_client_ops = {
	.init = tegra_dsi_init,
	.exit = tegra_dsi_exit,
};

static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
{
	struct clk *parent;
	int err;

	parent = clk_get_parent(dsi->clk);
	if (!parent)
		return -EINVAL;

	err = clk_set_parent(parent, dsi->clk_parent);
	if (err < 0)
		return err;

	return 0;
}

static void tegra_dsi_initialize(struct tegra_dsi *dsi)
{
	unsigned int i;

	tegra_dsi_writel(dsi, 0, DSI_POWER_CONTROL);

	tegra_dsi_writel(dsi, 0, DSI_INT_ENABLE);
	tegra_dsi_writel(dsi, 0, DSI_INT_STATUS);
	tegra_dsi_writel(dsi, 0, DSI_INT_MASK);

	tegra_dsi_writel(dsi, 0, DSI_HOST_CONTROL);
	tegra_dsi_writel(dsi, 0, DSI_CONTROL);

	tegra_dsi_writel(dsi, 0, DSI_SOL_DELAY);
	tegra_dsi_writel(dsi, 0, DSI_MAX_THRESHOLD);

	tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_CONTROL);

	for (i = 0; i < 8; i++) {
		tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_0 + i);
		tegra_dsi_writel(dsi, 0, DSI_INIT_SEQ_DATA_8 + i);
	}

	for (i = 0; i < 12; i++)
		tegra_dsi_writel(dsi, 0, DSI_PKT_SEQ_0_LO + i);

	tegra_dsi_writel(dsi, 0, DSI_DCS_CMDS);

	for (i = 0; i < 4; i++)
		tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1 + i);

	tegra_dsi_writel(dsi, 0x00000000, DSI_PHY_TIMING_0);
	tegra_dsi_writel(dsi, 0x00000000, DSI_PHY_TIMING_1);
	tegra_dsi_writel(dsi, 0x000000ff, DSI_PHY_TIMING_2);
	tegra_dsi_writel(dsi, 0x00000000, DSI_BTA_TIMING);

	tegra_dsi_writel(dsi, 0, DSI_TIMEOUT_0);
	tegra_dsi_writel(dsi, 0, DSI_TIMEOUT_1);
	tegra_dsi_writel(dsi, 0, DSI_TO_TALLY);

	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_CD);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CD_STATUS);
	tegra_dsi_writel(dsi, 0, DSI_VIDEO_MODE_CONTROL);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3);
	tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4);

	tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL);
	tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START);
	tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE);
}

static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
				 struct mipi_dsi_device *device)
{
	struct tegra_dsi *dsi = host_to_tegra(host);
	struct tegra_output *output = &dsi->output;

	dsi->format = device->format;
	dsi->lanes = device->lanes;

	output->panel = of_drm_find_panel(device->dev.of_node);
	if (output->panel) {
		if (output->connector.dev)
			drm_helper_hpd_irq_event(output->connector.dev);
	}

	return 0;
}

static int tegra_dsi_host_detach(struct mipi_dsi_host *host,
				 struct mipi_dsi_device *device)
{
	struct tegra_dsi *dsi = host_to_tegra(host);
	struct tegra_output *output = &dsi->output;

	if (output->panel && &device->dev == output->panel->dev) {
		if (output->connector.dev)
			drm_helper_hpd_irq_event(output->connector.dev);

		output->panel = NULL;
	}

	return 0;
}

static const struct mipi_dsi_host_ops tegra_dsi_host_ops = {
	.attach = tegra_dsi_host_attach,
	.detach = tegra_dsi_host_detach,
};

static int tegra_dsi_probe(struct platform_device *pdev)
{
	struct tegra_dsi *dsi;
	struct resource *regs;
	int err;

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

	dsi->output.dev = dsi->dev = &pdev->dev;

	err = tegra_output_probe(&dsi->output);
	if (err < 0)
		return err;

	/*
	 * Assume these values by default. When a DSI peripheral driver
	 * attaches to the DSI host, the parameters will be taken from
	 * the attached device.
	 */
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->lanes = 4;

	dsi->rst = devm_reset_control_get(&pdev->dev, "dsi");
	if (IS_ERR(dsi->rst))
		return PTR_ERR(dsi->rst);

	dsi->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(dsi->clk)) {
		dev_err(&pdev->dev, "cannot get DSI clock\n");
		return PTR_ERR(dsi->clk);
	}

	err = clk_prepare_enable(dsi->clk);
	if (err < 0) {
		dev_err(&pdev->dev, "cannot enable DSI clock\n");
		return err;
	}

	dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
	if (IS_ERR(dsi->clk_lp)) {
		dev_err(&pdev->dev, "cannot get low-power clock\n");
		return PTR_ERR(dsi->clk_lp);
	}

	err = clk_prepare_enable(dsi->clk_lp);
	if (err < 0) {
		dev_err(&pdev->dev, "cannot enable low-power clock\n");
		return err;
	}

	dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
	if (IS_ERR(dsi->clk_parent)) {
		dev_err(&pdev->dev, "cannot get parent clock\n");
		return PTR_ERR(dsi->clk_parent);
	}

	err = clk_prepare_enable(dsi->clk_parent);
	if (err < 0) {
		dev_err(&pdev->dev, "cannot enable parent clock\n");
		return err;
	}

	err = tegra_dsi_setup_clocks(dsi);
	if (err < 0) {
		dev_err(&pdev->dev, "cannot setup clocks\n");
		return err;
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
	if (IS_ERR(dsi->regs))
		return PTR_ERR(dsi->regs);

	tegra_dsi_initialize(dsi);

	dsi->mipi = tegra_mipi_request(&pdev->dev);
	if (IS_ERR(dsi->mipi))
		return PTR_ERR(dsi->mipi);

	dsi->host.ops = &tegra_dsi_host_ops;
	dsi->host.dev = &pdev->dev;

	err = mipi_dsi_host_register(&dsi->host);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to register DSI host: %d\n", err);
		return err;
	}

	INIT_LIST_HEAD(&dsi->client.list);
	dsi->client.ops = &dsi_client_ops;
	dsi->client.dev = &pdev->dev;

	err = host1x_client_register(&dsi->client);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to register host1x client: %d\n",
			err);
		return err;
	}

	platform_set_drvdata(pdev, dsi);

	return 0;
}

static int tegra_dsi_remove(struct platform_device *pdev)
{
	struct tegra_dsi *dsi = platform_get_drvdata(pdev);
	int err;

	err = host1x_client_unregister(&dsi->client);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
			err);
		return err;
	}

	mipi_dsi_host_unregister(&dsi->host);
	tegra_mipi_free(dsi->mipi);

	clk_disable_unprepare(dsi->clk_parent);
	clk_disable_unprepare(dsi->clk_lp);
	clk_disable_unprepare(dsi->clk);

	err = tegra_output_remove(&dsi->output);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to remove output: %d\n", err);
		return err;
	}

	return 0;
}

static const struct of_device_id tegra_dsi_of_match[] = {
	{ .compatible = "nvidia,tegra114-dsi", },
	{ },
};

struct platform_driver tegra_dsi_driver = {
	.driver = {
		.name = "tegra-dsi",
		.of_match_table = tegra_dsi_of_match,
	},
	.probe = tegra_dsi_probe,
	.remove = tegra_dsi_remove,
};