summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/mcde/mcde_dsi.c
blob: 2314c81229920dc96f385272571b2857a8ef2cb1 (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
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
// SPDX-License-Identifier: GPL-2.0+
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_encoder.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include "mcde_drm.h"
#include "mcde_dsi_regs.h"

#define DSI_DEFAULT_LP_FREQ_HZ	19200000
#define DSI_DEFAULT_HS_FREQ_HZ	420160000

/* PRCMU DSI reset registers */
#define PRCM_DSI_SW_RESET 0x324
#define PRCM_DSI_SW_RESET_DSI0_SW_RESETN BIT(0)
#define PRCM_DSI_SW_RESET_DSI1_SW_RESETN BIT(1)
#define PRCM_DSI_SW_RESET_DSI2_SW_RESETN BIT(2)

struct mcde_dsi {
	struct device *dev;
	struct mcde *mcde;
	struct drm_bridge bridge;
	struct drm_panel *panel;
	struct drm_bridge *bridge_out;
	struct mipi_dsi_host dsi_host;
	struct mipi_dsi_device *mdsi;
	const struct drm_display_mode *mode;
	struct clk *hs_clk;
	struct clk *lp_clk;
	unsigned long hs_freq;
	unsigned long lp_freq;
	bool unused;

	void __iomem *regs;
	struct regmap *prcmu;
};

static inline struct mcde_dsi *bridge_to_mcde_dsi(struct drm_bridge *bridge)
{
	return container_of(bridge, struct mcde_dsi, bridge);
}

static inline struct mcde_dsi *host_to_mcde_dsi(struct mipi_dsi_host *h)
{
	return container_of(h, struct mcde_dsi, dsi_host);
}

bool mcde_dsi_irq(struct mipi_dsi_device *mdsi)
{
	struct mcde_dsi *d;
	u32 val;
	bool te_received = false;

	d = host_to_mcde_dsi(mdsi->host);

	dev_dbg(d->dev, "%s called\n", __func__);

	val = readl(d->regs + DSI_DIRECT_CMD_STS_FLAG);
	if (val)
		dev_dbg(d->dev, "DSI_DIRECT_CMD_STS_FLAG = %08x\n", val);
	if (val & DSI_DIRECT_CMD_STS_WRITE_COMPLETED)
		dev_dbg(d->dev, "direct command write completed\n");
	if (val & DSI_DIRECT_CMD_STS_TE_RECEIVED) {
		te_received = true;
		dev_dbg(d->dev, "direct command TE received\n");
	}
	if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED)
		dev_err(d->dev, "direct command ACK ERR received\n");
	if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR)
		dev_err(d->dev, "direct command read ERR received\n");
	/* Mask off the ACK value and clear status */
	writel(val, d->regs + DSI_DIRECT_CMD_STS_CLR);

	val = readl(d->regs + DSI_CMD_MODE_STS_FLAG);
	if (val)
		dev_dbg(d->dev, "DSI_CMD_MODE_STS_FLAG = %08x\n", val);
	if (val & DSI_CMD_MODE_STS_ERR_NO_TE)
		/* This happens all the time (safe to ignore) */
		dev_dbg(d->dev, "CMD mode no TE\n");
	if (val & DSI_CMD_MODE_STS_ERR_TE_MISS)
		/* This happens all the time (safe to ignore) */
		dev_dbg(d->dev, "CMD mode TE miss\n");
	if (val & DSI_CMD_MODE_STS_ERR_SDI1_UNDERRUN)
		dev_err(d->dev, "CMD mode SD1 underrun\n");
	if (val & DSI_CMD_MODE_STS_ERR_SDI2_UNDERRUN)
		dev_err(d->dev, "CMD mode SD2 underrun\n");
	if (val & DSI_CMD_MODE_STS_ERR_UNWANTED_RD)
		dev_err(d->dev, "CMD mode unwanted RD\n");
	writel(val, d->regs + DSI_CMD_MODE_STS_CLR);

	val = readl(d->regs + DSI_DIRECT_CMD_RD_STS_FLAG);
	if (val)
		dev_dbg(d->dev, "DSI_DIRECT_CMD_RD_STS_FLAG = %08x\n", val);
	writel(val, d->regs + DSI_DIRECT_CMD_RD_STS_CLR);

	val = readl(d->regs + DSI_TG_STS_FLAG);
	if (val)
		dev_dbg(d->dev, "DSI_TG_STS_FLAG = %08x\n", val);
	writel(val, d->regs + DSI_TG_STS_CLR);

	val = readl(d->regs + DSI_VID_MODE_STS_FLAG);
	if (val)
		dev_dbg(d->dev, "DSI_VID_MODE_STS_FLAG = %08x\n", val);
	if (val & DSI_VID_MODE_STS_VSG_RUNNING)
		dev_dbg(d->dev, "VID mode VSG running\n");
	if (val & DSI_VID_MODE_STS_ERR_MISSING_DATA)
		dev_err(d->dev, "VID mode missing data\n");
	if (val & DSI_VID_MODE_STS_ERR_MISSING_HSYNC)
		dev_err(d->dev, "VID mode missing HSYNC\n");
	if (val & DSI_VID_MODE_STS_ERR_MISSING_VSYNC)
		dev_err(d->dev, "VID mode missing VSYNC\n");
	if (val & DSI_VID_MODE_STS_REG_ERR_SMALL_LENGTH)
		dev_err(d->dev, "VID mode less bytes than expected between two HSYNC\n");
	if (val & DSI_VID_MODE_STS_REG_ERR_SMALL_HEIGHT)
		dev_err(d->dev, "VID mode less lines than expected between two VSYNC\n");
	if (val & (DSI_VID_MODE_STS_ERR_BURSTWRITE |
		   DSI_VID_MODE_STS_ERR_LINEWRITE |
		   DSI_VID_MODE_STS_ERR_LONGREAD))
		dev_err(d->dev, "VID mode read/write error\n");
	if (val & DSI_VID_MODE_STS_ERR_VRS_WRONG_LENGTH)
		dev_err(d->dev, "VID mode received packets differ from expected size\n");
	if (val & DSI_VID_MODE_STS_VSG_RECOVERY)
		dev_err(d->dev, "VID mode VSG in recovery mode\n");
	writel(val, d->regs + DSI_VID_MODE_STS_CLR);

	return te_received;
}

static void mcde_dsi_attach_to_mcde(struct mcde_dsi *d)
{
	d->mcde->mdsi = d->mdsi;

	/*
	 * Select the way the DSI data flow is pushing to the display:
	 * currently we just support video or command mode depending
	 * on the type of display. Video mode defaults to using the
	 * formatter itself for synchronization (stateless video panel).
	 *
	 * FIXME: add flags to struct mipi_dsi_device .flags to indicate
	 * displays that require BTA (bus turn around) so we can handle
	 * such displays as well. Figure out how to properly handle
	 * single frame on-demand updates with DRM for command mode
	 * displays (MCDE_COMMAND_ONESHOT_FLOW).
	 */
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO)
		d->mcde->flow_mode = MCDE_VIDEO_FORMATTER_FLOW;
	else
		d->mcde->flow_mode = MCDE_COMMAND_TE_FLOW;
}

static int mcde_dsi_host_attach(struct mipi_dsi_host *host,
				struct mipi_dsi_device *mdsi)
{
	struct mcde_dsi *d = host_to_mcde_dsi(host);

	if (mdsi->lanes < 1 || mdsi->lanes > 2) {
		DRM_ERROR("dsi device params invalid, 1 or 2 lanes supported\n");
		return -EINVAL;
	}

	dev_info(d->dev, "attached DSI device with %d lanes\n", mdsi->lanes);
	/* MIPI_DSI_FMT_RGB88 etc */
	dev_info(d->dev, "format %08x, %dbpp\n", mdsi->format,
		 mipi_dsi_pixel_format_to_bpp(mdsi->format));
	dev_info(d->dev, "mode flags: %08lx\n", mdsi->mode_flags);

	d->mdsi = mdsi;
	if (d->mcde)
		mcde_dsi_attach_to_mcde(d);

	return 0;
}

static int mcde_dsi_host_detach(struct mipi_dsi_host *host,
				struct mipi_dsi_device *mdsi)
{
	struct mcde_dsi *d = host_to_mcde_dsi(host);

	d->mdsi = NULL;
	if (d->mcde)
		d->mcde->mdsi = NULL;

	return 0;
}

#define MCDE_DSI_HOST_IS_READ(type)			    \
	((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \
	 (type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \
	 (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
	 (type == MIPI_DSI_DCS_READ))

static int mcde_dsi_execute_transfer(struct mcde_dsi *d,
				     const struct mipi_dsi_msg *msg)
{
	const u32 loop_delay_us = 10; /* us */
	u32 loop_counter;
	size_t txlen = msg->tx_len;
	size_t rxlen = msg->rx_len;
	int i;
	u32 val;
	int ret;

	writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR);
	writel(~0, d->regs + DSI_CMD_MODE_STS_CLR);
	/* Send command */
	writel(1, d->regs + DSI_DIRECT_CMD_SEND);

	loop_counter = 1000 * 1000 / loop_delay_us;
	if (MCDE_DSI_HOST_IS_READ(msg->type)) {
		/* Read command */
		while (!(readl(d->regs + DSI_DIRECT_CMD_STS) &
			 (DSI_DIRECT_CMD_STS_READ_COMPLETED |
			  DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR))
		       && --loop_counter)
			usleep_range(loop_delay_us, (loop_delay_us * 3) / 2);
		if (!loop_counter) {
			dev_err(d->dev, "DSI read timeout!\n");
			/* Set exit code and retry */
			return -ETIME;
		}
	} else {
		/* Writing only */
		while (!(readl(d->regs + DSI_DIRECT_CMD_STS) &
			 DSI_DIRECT_CMD_STS_WRITE_COMPLETED)
		       && --loop_counter)
			usleep_range(loop_delay_us, (loop_delay_us * 3) / 2);

		if (!loop_counter) {
			/* Set exit code and retry */
			dev_err(d->dev, "DSI write timeout!\n");
			return -ETIME;
		}
	}

	val = readl(d->regs + DSI_DIRECT_CMD_STS);
	if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR) {
		dev_err(d->dev, "read completed with error\n");
		writel(1, d->regs + DSI_DIRECT_CMD_RD_INIT);
		return -EIO;
	}
	if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED) {
		val >>= DSI_DIRECT_CMD_STS_ACK_VAL_SHIFT;
		dev_err(d->dev, "error during transmission: %04x\n",
			val);
		return -EIO;
	}

	if (!MCDE_DSI_HOST_IS_READ(msg->type)) {
		/* Return number of bytes written */
		ret = txlen;
	} else {
		/* OK this is a read command, get the response */
		u32 rdsz;
		u32 rddat;
		u8 *rx = msg->rx_buf;

		rdsz = readl(d->regs + DSI_DIRECT_CMD_RD_PROPERTY);
		rdsz &= DSI_DIRECT_CMD_RD_PROPERTY_RD_SIZE_MASK;
		rddat = readl(d->regs + DSI_DIRECT_CMD_RDDAT);
		if (rdsz < rxlen) {
			dev_err(d->dev, "read error, requested %zd got %d\n",
				rxlen, rdsz);
			return -EIO;
		}
		/* FIXME: read more than 4 bytes */
		for (i = 0; i < 4 && i < rxlen; i++)
			rx[i] = (rddat >> (i * 8)) & 0xff;
		ret = rdsz;
	}

	/* Successful transmission */
	return ret;
}

static ssize_t mcde_dsi_host_transfer(struct mipi_dsi_host *host,
				      const struct mipi_dsi_msg *msg)
{
	struct mcde_dsi *d = host_to_mcde_dsi(host);
	const u8 *tx = msg->tx_buf;
	size_t txlen = msg->tx_len;
	size_t rxlen = msg->rx_len;
	unsigned int retries = 0;
	u32 val;
	int ret;
	int i;

	if (txlen > 16) {
		dev_err(d->dev,
			"dunno how to write more than 16 bytes yet\n");
		return -EIO;
	}
	if (rxlen > 4) {
		dev_err(d->dev,
			"dunno how to read more than 4 bytes yet\n");
		return -EIO;
	}

	dev_dbg(d->dev,
		"message to channel %d, write %zd bytes read %zd bytes\n",
		msg->channel, txlen, rxlen);

	/* Command "nature" */
	if (MCDE_DSI_HOST_IS_READ(msg->type))
		/* MCTL_MAIN_DATA_CTL already set up */
		val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_READ;
	else
		val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_WRITE;
	/*
	 * More than 2 bytes will not fit in a single packet, so it's
	 * time to set the "long not short" bit. One byte is used by
	 * the MIPI DCS command leaving just one byte for the payload
	 * in a short package.
	 */
	if (mipi_dsi_packet_format_is_long(msg->type))
		val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LONGNOTSHORT;
	val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT;
	val |= txlen << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT;
	val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN;
	val |= msg->type << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT;
	writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS);

	/* MIPI DCS command is part of the data */
	if (txlen > 0) {
		val = 0;
		for (i = 0; i < 4 && i < txlen; i++)
			val |= tx[i] << (i * 8);
	}
	writel(val, d->regs + DSI_DIRECT_CMD_WRDAT0);
	if (txlen > 4) {
		val = 0;
		for (i = 0; i < 4 && (i + 4) < txlen; i++)
			val |= tx[i + 4] << (i * 8);
		writel(val, d->regs + DSI_DIRECT_CMD_WRDAT1);
	}
	if (txlen > 8) {
		val = 0;
		for (i = 0; i < 4 && (i + 8) < txlen; i++)
			val |= tx[i + 8] << (i * 8);
		writel(val, d->regs + DSI_DIRECT_CMD_WRDAT2);
	}
	if (txlen > 12) {
		val = 0;
		for (i = 0; i < 4 && (i + 12) < txlen; i++)
			val |= tx[i + 12] << (i * 8);
		writel(val, d->regs + DSI_DIRECT_CMD_WRDAT3);
	}

	while (retries < 3) {
		ret = mcde_dsi_execute_transfer(d, msg);
		if (ret >= 0)
			break;
		retries++;
	}
	if (ret < 0 && retries)
		dev_err(d->dev, "gave up after %d retries\n", retries);

	/* Clear any errors */
	writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR);
	writel(~0, d->regs + DSI_CMD_MODE_STS_CLR);

	return ret;
}

static const struct mipi_dsi_host_ops mcde_dsi_host_ops = {
	.attach = mcde_dsi_host_attach,
	.detach = mcde_dsi_host_detach,
	.transfer = mcde_dsi_host_transfer,
};

/* This sends a direct (short) command to request TE */
void mcde_dsi_te_request(struct mipi_dsi_device *mdsi)
{
	struct mcde_dsi *d;
	u32 val;

	d = host_to_mcde_dsi(mdsi->host);

	/* Command "nature" TE request */
	val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_TE_REQ;
	val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT;
	val |= 2 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT;
	val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN;
	val |= MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM <<
		DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT;
	writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS);

	/* Clear TE reveived and error status bits and enables them */
	writel(DSI_DIRECT_CMD_STS_CLR_TE_RECEIVED_CLR |
	       DSI_DIRECT_CMD_STS_CLR_ACKNOWLEDGE_WITH_ERR_RECEIVED_CLR,
	       d->regs + DSI_DIRECT_CMD_STS_CLR);
	val = readl(d->regs + DSI_DIRECT_CMD_STS_CTL);
	val |= DSI_DIRECT_CMD_STS_CTL_TE_RECEIVED_EN;
	val |= DSI_DIRECT_CMD_STS_CTL_ACKNOWLEDGE_WITH_ERR_EN;
	writel(val, d->regs + DSI_DIRECT_CMD_STS_CTL);

	/* Clear and enable no TE or TE missing status */
	writel(DSI_CMD_MODE_STS_CLR_ERR_NO_TE_CLR |
	       DSI_CMD_MODE_STS_CLR_ERR_TE_MISS_CLR,
	       d->regs + DSI_CMD_MODE_STS_CLR);
	val = readl(d->regs + DSI_CMD_MODE_STS_CTL);
	val |= DSI_CMD_MODE_STS_CTL_ERR_NO_TE_EN;
	val |= DSI_CMD_MODE_STS_CTL_ERR_TE_MISS_EN;
	writel(val, d->regs + DSI_CMD_MODE_STS_CTL);

	/* Send this TE request command */
	writel(1, d->regs + DSI_DIRECT_CMD_SEND);
}

static void mcde_dsi_setup_video_mode(struct mcde_dsi *d,
				      const struct drm_display_mode *mode)
{
	/* cpp, characters per pixel, number of bytes per pixel */
	u8 cpp = mipi_dsi_pixel_format_to_bpp(d->mdsi->format) / 8;
	u64 pclk;
	u64 bpl;
	int hfp;
	int hbp;
	int hsa;
	u32 blkline_pck, line_duration;
	u32 val;

	val = 0;
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
		val |= DSI_VID_MAIN_CTL_BURST_MODE;
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
		val |= DSI_VID_MAIN_CTL_SYNC_PULSE_ACTIVE;
		val |= DSI_VID_MAIN_CTL_SYNC_PULSE_HORIZONTAL;
	}
	/* RGB header and pixel mode */
	switch (d->mdsi->format) {
	case MIPI_DSI_FMT_RGB565:
		val |= MIPI_DSI_PACKED_PIXEL_STREAM_16 <<
			DSI_VID_MAIN_CTL_HEADER_SHIFT;
		val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_16BITS;
		break;
	case MIPI_DSI_FMT_RGB666_PACKED:
		val |= MIPI_DSI_PACKED_PIXEL_STREAM_18 <<
			DSI_VID_MAIN_CTL_HEADER_SHIFT;
		val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS;
		break;
	case MIPI_DSI_FMT_RGB666:
		val |= MIPI_DSI_PIXEL_STREAM_3BYTE_18
			<< DSI_VID_MAIN_CTL_HEADER_SHIFT;
		val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS_LOOSE;
		break;
	case MIPI_DSI_FMT_RGB888:
		val |= MIPI_DSI_PACKED_PIXEL_STREAM_24 <<
			DSI_VID_MAIN_CTL_HEADER_SHIFT;
		val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_24BITS;
		break;
	default:
		dev_err(d->dev, "unknown pixel mode\n");
		return;
	}

	/* TODO: TVG (test video generator) could be enabled here */

	/*
	 * During vertical blanking: go to LP mode
	 * Like with the EOL setting, if this is not set, the EOL area will be
	 * filled with NULL or blanking packets in the vblank area.
	 * FIXME: some Samsung phones and display panels such as s6e63m0 use
	 * DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_BLANKING here instead,
	 * figure out how to properly configure that from the panel.
	 */
	val |= DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_LP_0;
	/*
	 * During EOL: go to LP mode. If this is not set, the EOL area will be
	 * filled with NULL or blanking packets.
	 */
	val |= DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0;
	/* Recovery mode 1 */
	val |= 1 << DSI_VID_MAIN_CTL_RECOVERY_MODE_SHIFT;
	/* All other fields zero */
	writel(val, d->regs + DSI_VID_MAIN_CTL);

	/* Vertical frame parameters are pretty straight-forward */
	val = mode->vdisplay << DSI_VID_VSIZE_VACT_LENGTH_SHIFT;
	/* vertical front porch */
	val |= (mode->vsync_start - mode->vdisplay)
		<< DSI_VID_VSIZE_VFP_LENGTH_SHIFT;
	/* vertical sync active */
	val |= (mode->vsync_end - mode->vsync_start)
		<< DSI_VID_VSIZE_VSA_LENGTH_SHIFT;
	/* vertical back porch */
	val |= (mode->vtotal - mode->vsync_end)
		<< DSI_VID_VSIZE_VBP_LENGTH_SHIFT;
	writel(val, d->regs + DSI_VID_VSIZE);

	/*
	 * Horizontal frame parameters:
	 * horizontal resolution is given in pixels but must be re-calculated
	 * into bytes since this is what the hardware expects, these registers
	 * define the payload size of the packet.
	 *
	 * hfp = horizontal front porch in bytes
	 * hbp = horizontal back porch in bytes
	 * hsa = horizontal sync active in bytes
	 *
	 * 6 + 2 is HFP header + checksum
	 */
	hfp = (mode->hsync_start - mode->hdisplay) * cpp - 6 - 2;
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
		/*
		 * Use sync pulse for sync: explicit HSA time
		 * 6 is HBP header + checksum
		 * 4 is RGB header + checksum
		 */
		hbp = (mode->htotal - mode->hsync_end) * cpp - 4 - 6;
		/*
		 * 6 is HBP header + checksum
		 * 4 is HSW packet bytes
		 * 4 is RGB header + checksum
		 */
		hsa = (mode->hsync_end - mode->hsync_start) * cpp - 4 - 4 - 6;
	} else {
		/*
		 * Use event for sync: HBP includes both back porch and sync
		 * 6 is HBP header + checksum
		 * 4 is HSW packet bytes
		 * 4 is RGB header + checksum
		 */
		hbp = (mode->htotal - mode->hsync_start) * cpp - 4 - 4 - 6;
		/* HSA is not present in this mode and set to 0 */
		hsa = 0;
	}
	if (hfp < 0) {
		dev_info(d->dev, "hfp negative, set to 0\n");
		hfp = 0;
	}
	if (hbp < 0) {
		dev_info(d->dev, "hbp negative, set to 0\n");
		hbp = 0;
	}
	if (hsa < 0) {
		dev_info(d->dev, "hsa negative, set to 0\n");
		hsa = 0;
	}
	dev_dbg(d->dev, "hfp: %u, hbp: %u, hsa: %u bytes\n",
		hfp, hbp, hsa);

	/* Frame parameters: horizontal sync active */
	val = hsa << DSI_VID_HSIZE1_HSA_LENGTH_SHIFT;
	/* horizontal back porch */
	val |= hbp << DSI_VID_HSIZE1_HBP_LENGTH_SHIFT;
	/* horizontal front porch */
	val |= hfp << DSI_VID_HSIZE1_HFP_LENGTH_SHIFT;
	writel(val, d->regs + DSI_VID_HSIZE1);

	/* RGB data length (visible bytes on one scanline) */
	val = mode->hdisplay * cpp;
	writel(val, d->regs + DSI_VID_HSIZE2);
	dev_dbg(d->dev, "RGB length, visible area on a line: %u bytes\n", val);

	/*
	 * Calculate the time between two pixels in picoseconds using
	 * the supplied refresh rate and total resolution including
	 * porches and sync.
	 */
	/* (ps/s) / (pixels/s) = ps/pixels */
	pclk = DIV_ROUND_UP_ULL(1000000000000, mode->clock);
	dev_dbg(d->dev, "picoseconds between two pixels: %llu\n",
		pclk);

	/*
	 * How many bytes per line will this update frequency yield?
	 *
	 * Calculate the number of picoseconds for one scanline (1), then
	 * divide by 1000000000000 (2) to get in pixels per second we
	 * want to output.
	 *
	 * Multiply with number of bytes per second at this video display
	 * frequency (3) to get number of bytes transferred during this
	 * time. Notice that we use the frequency the display wants,
	 * not what we actually get from the DSI PLL, which is hs_freq.
	 *
	 * These arithmetics are done in a different order to avoid
	 * overflow.
	 */
	bpl = pclk * mode->htotal; /* (1) picoseconds per line */
	dev_dbg(d->dev, "picoseconds per line: %llu\n", bpl);
	/* Multiply with bytes per second (3) */
	bpl *= (d->mdsi->hs_rate / 8);
	/* Pixels per second (2) */
	bpl = DIV_ROUND_DOWN_ULL(bpl, 1000000); /* microseconds */
	bpl = DIV_ROUND_DOWN_ULL(bpl, 1000000); /* seconds */
	/* parallel transactions in all lanes */
	bpl *= d->mdsi->lanes;
	dev_dbg(d->dev,
		"calculated bytes per line: %llu @ %d Hz with HS %lu Hz\n",
		bpl, drm_mode_vrefresh(mode), d->mdsi->hs_rate);

	/*
	 * 6 is header + checksum, header = 4 bytes, checksum = 2 bytes
	 * 4 is short packet for vsync/hsync
	 */
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
		/* Set the event packet size to 0 (not used) */
		writel(0, d->regs + DSI_VID_BLKSIZE1);
		/*
		 * FIXME: isn't the hsync width in pixels? The porch and
		 * sync area size is in pixels here, but this -6
		 * seems to be for bytes. It looks like this in the vendor
		 * code though. Is it completely untested?
		 */
		blkline_pck = bpl - (mode->hsync_end - mode->hsync_start) - 6;
		val = blkline_pck << DSI_VID_BLKSIZE2_BLKLINE_PULSE_PCK_SHIFT;
		writel(val, d->regs + DSI_VID_BLKSIZE2);
	} else {
		/* Set the sync pulse packet size to 0 (not used) */
		writel(0, d->regs + DSI_VID_BLKSIZE2);
		/* Specifying payload size in bytes (-4-6 from manual) */
		blkline_pck = bpl - 4 - 6;
		if (blkline_pck > 0x1FFF)
			dev_err(d->dev, "blkline_pck too big %d bytes\n",
				blkline_pck);
		val = blkline_pck << DSI_VID_BLKSIZE1_BLKLINE_EVENT_PCK_SHIFT;
		val &= DSI_VID_BLKSIZE1_BLKLINE_EVENT_PCK_MASK;
		writel(val, d->regs + DSI_VID_BLKSIZE1);
	}

	/*
	 * The line duration is used to scale back the frequency from
	 * the max frequency supported by the HS clock to the desired
	 * update frequency in vrefresh.
	 */
	line_duration = blkline_pck + 6;
	/*
	 * The datasheet contains this complex condition to decreasing
	 * the line duration by 1 under very specific circumstances.
	 * Here we also imply that LP is used during burst EOL.
	 */
	if (d->mdsi->lanes == 2 && (hsa & 0x01) && (hfp & 0x01)
	    && (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST))
		line_duration--;
	line_duration = DIV_ROUND_CLOSEST(line_duration, d->mdsi->lanes);
	dev_dbg(d->dev, "line duration %u bytes\n", line_duration);
	val = line_duration << DSI_VID_DPHY_TIME_REG_LINE_DURATION_SHIFT;
	/*
	 * This is the time to perform LP->HS on D-PHY
	 * FIXME: nowhere to get this from: DT property on the DSI?
	 * The manual says this is "system dependent".
	 * values like 48 and 72 seen in the vendor code.
	 */
	val |= 48 << DSI_VID_DPHY_TIME_REG_WAKEUP_TIME_SHIFT;
	writel(val, d->regs + DSI_VID_DPHY_TIME);

	/*
	 * See the manual figure 657 page 2203 for understanding the impact
	 * of the different burst mode settings.
	 */
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
		int blkeol_pck, blkeol_duration;
		/*
		 * Packet size at EOL for burst mode, this is only used
		 * if DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0 is NOT set,
		 * but we instead send NULL or blanking packets at EOL.
		 * This is given in number of bytes.
		 *
		 * See the manual page 2198 for the 13 reg_blkeol_pck bits.
		 */
		blkeol_pck = bpl - (mode->htotal * cpp) - 6;
		if (blkeol_pck < 0) {
			dev_err(d->dev, "video block does not fit on line!\n");
			dev_err(d->dev,
				"calculated bytes per line: %llu @ %d Hz\n",
				bpl, drm_mode_vrefresh(mode));
			dev_err(d->dev,
				"bytes per line (blkline_pck) %u bytes\n",
				blkline_pck);
			dev_err(d->dev,
				"blkeol_pck becomes %d bytes\n", blkeol_pck);
			return;
		}
		dev_dbg(d->dev, "BLKEOL packet: %d bytes\n", blkeol_pck);

		val = readl(d->regs + DSI_VID_BLKSIZE1);
		val &= ~DSI_VID_BLKSIZE1_BLKEOL_PCK_MASK;
		val |= blkeol_pck << DSI_VID_BLKSIZE1_BLKEOL_PCK_SHIFT;
		writel(val, d->regs + DSI_VID_BLKSIZE1);
		/* Use the same value for exact burst limit */
		val = blkeol_pck <<
			DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_SHIFT;
		val &= DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_MASK;
		writel(val, d->regs + DSI_VID_VCA_SETTING2);
		/*
		 * This BLKEOL duration is claimed to be the duration in clock
		 * cycles of the BLLP end-of-line (EOL) period for each line if
		 * DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0 is set.
		 *
		 * It is hard to trust the manuals' claim that this is in clock
		 * cycles as we mimic the behaviour of the vendor code, which
		 * appears to write a number of bytes that would have been
		 * transferred on a single lane.
		 *
		 * See the manual figure 657 page 2203 and page 2198 for the 13
		 * reg_blkeol_duration bits.
		 *
		 * FIXME: should this also be set up also for non-burst mode
		 * according to figure 565 page 2202?
		 */
		blkeol_duration = DIV_ROUND_CLOSEST(blkeol_pck + 6,
						    d->mdsi->lanes);
		dev_dbg(d->dev, "BLKEOL duration: %d clock cycles\n",
			blkeol_duration);

		val = readl(d->regs + DSI_VID_PCK_TIME);
		val &= ~DSI_VID_PCK_TIME_BLKEOL_DURATION_MASK;
		val |= blkeol_duration <<
			DSI_VID_PCK_TIME_BLKEOL_DURATION_SHIFT;
		writel(val, d->regs + DSI_VID_PCK_TIME);

		/* Max burst limit, this is given in bytes */
		val = readl(d->regs + DSI_VID_VCA_SETTING1);
		val &= ~DSI_VID_VCA_SETTING1_MAX_BURST_LIMIT_MASK;
		val |= (blkeol_pck - 6) <<
			DSI_VID_VCA_SETTING1_MAX_BURST_LIMIT_SHIFT;
		writel(val, d->regs + DSI_VID_VCA_SETTING1);
	}

	/* Maximum line limit */
	val = readl(d->regs + DSI_VID_VCA_SETTING2);
	val &= ~DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_MASK;
	val |= (blkline_pck - 6) <<
		DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_SHIFT;
	writel(val, d->regs + DSI_VID_VCA_SETTING2);
	dev_dbg(d->dev, "blkline pck: %d bytes\n", blkline_pck - 6);
}

static void mcde_dsi_start(struct mcde_dsi *d)
{
	unsigned long hs_freq;
	u32 val;
	int i;

	/* No integration mode */
	writel(0, d->regs + DSI_MCTL_INTEGRATION_MODE);

	/* Enable the DSI port, from drivers/video/mcde/dsilink_v2.c */
	val = DSI_MCTL_MAIN_DATA_CTL_LINK_EN |
		DSI_MCTL_MAIN_DATA_CTL_BTA_EN |
		DSI_MCTL_MAIN_DATA_CTL_READ_EN |
		DSI_MCTL_MAIN_DATA_CTL_REG_TE_EN;
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET)
		val |= DSI_MCTL_MAIN_DATA_CTL_HOST_EOT_GEN;
	writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);

	/* Set a high command timeout, clear other fields */
	val = 0x3ff << DSI_CMD_MODE_CTL_TE_TIMEOUT_SHIFT;
	writel(val, d->regs + DSI_CMD_MODE_CTL);

	/*
	 * UI_X4 is described as "unit interval times four"
	 * I guess since DSI packets are 4 bytes wide, one unit
	 * is one byte.
	 */
	hs_freq = clk_get_rate(d->hs_clk);
	hs_freq /= 1000000; /* MHz */
	val = 4000 / hs_freq;
	dev_dbg(d->dev, "UI value: %d\n", val);
	val <<= DSI_MCTL_DPHY_STATIC_UI_X4_SHIFT;
	val &= DSI_MCTL_DPHY_STATIC_UI_X4_MASK;
	writel(val, d->regs + DSI_MCTL_DPHY_STATIC);

	/*
	 * Enable clocking: 0x0f (something?) between each burst,
	 * enable the second lane if needed, enable continuous clock if
	 * needed, enable switch into ULPM (ultra-low power mode) on
	 * all the lines.
	 */
	val = 0x0f << DSI_MCTL_MAIN_PHY_CTL_WAIT_BURST_TIME_SHIFT;
	if (d->mdsi->lanes == 2)
		val |= DSI_MCTL_MAIN_PHY_CTL_LANE2_EN;
	if (!(d->mdsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
		val |= DSI_MCTL_MAIN_PHY_CTL_CLK_CONTINUOUS;
	val |= DSI_MCTL_MAIN_PHY_CTL_CLK_ULPM_EN |
		DSI_MCTL_MAIN_PHY_CTL_DAT1_ULPM_EN |
		DSI_MCTL_MAIN_PHY_CTL_DAT2_ULPM_EN;
	writel(val, d->regs + DSI_MCTL_MAIN_PHY_CTL);

	val = (1 << DSI_MCTL_ULPOUT_TIME_CKLANE_ULPOUT_TIME_SHIFT) |
		(1 << DSI_MCTL_ULPOUT_TIME_DATA_ULPOUT_TIME_SHIFT);
	writel(val, d->regs + DSI_MCTL_ULPOUT_TIME);

	writel(DSI_DPHY_LANES_TRIM_DPHY_SPECS_90_81B_0_90,
	       d->regs + DSI_DPHY_LANES_TRIM);

	/* High PHY timeout */
	val = (0x0f << DSI_MCTL_DPHY_TIMEOUT_CLK_DIV_SHIFT) |
		(0x3fff << DSI_MCTL_DPHY_TIMEOUT_HSTX_TO_VAL_SHIFT) |
		(0x3fff << DSI_MCTL_DPHY_TIMEOUT_LPRX_TO_VAL_SHIFT);
	writel(val, d->regs + DSI_MCTL_DPHY_TIMEOUT);

	val = DSI_MCTL_MAIN_EN_PLL_START |
		DSI_MCTL_MAIN_EN_CKLANE_EN |
		DSI_MCTL_MAIN_EN_DAT1_EN |
		DSI_MCTL_MAIN_EN_IF1_EN;
	if (d->mdsi->lanes == 2)
		val |= DSI_MCTL_MAIN_EN_DAT2_EN;
	writel(val, d->regs + DSI_MCTL_MAIN_EN);

	/* Wait for the PLL to lock and the clock and data lines to come up */
	i = 0;
	val = DSI_MCTL_MAIN_STS_PLL_LOCK |
		DSI_MCTL_MAIN_STS_CLKLANE_READY |
		DSI_MCTL_MAIN_STS_DAT1_READY;
	if (d->mdsi->lanes == 2)
		val |= DSI_MCTL_MAIN_STS_DAT2_READY;
	while ((readl(d->regs + DSI_MCTL_MAIN_STS) & val) != val) {
		/* Sleep for a millisecond */
		usleep_range(1000, 1500);
		if (i++ == 100) {
			dev_warn(d->dev, "DSI lanes did not start up\n");
			return;
		}
	}

	/* TODO needed? */

	/* Command mode, clear IF1 ID */
	val = readl(d->regs + DSI_CMD_MODE_CTL);
	/*
	 * If we enable low-power mode here,
	 * then display updates become really slow.
	 */
	if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM)
		val |= DSI_CMD_MODE_CTL_IF1_LP_EN;
	val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK;
	writel(val, d->regs + DSI_CMD_MODE_CTL);

	/* Wait for DSI PHY to initialize */
	usleep_range(100, 200);
	dev_info(d->dev, "DSI link enabled\n");
}

/*
 * Notice that this is called from inside the display controller
 * and not from the bridge callbacks.
 */
void mcde_dsi_enable(struct drm_bridge *bridge)
{
	struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
	unsigned long hs_freq, lp_freq;
	u32 val;
	int ret;

	/* Copy maximum clock frequencies */
	if (d->mdsi->lp_rate)
		lp_freq = d->mdsi->lp_rate;
	else
		lp_freq = DSI_DEFAULT_LP_FREQ_HZ;
	if (d->mdsi->hs_rate)
		hs_freq = d->mdsi->hs_rate;
	else
		hs_freq = DSI_DEFAULT_HS_FREQ_HZ;

	/* Enable LP (Low Power, Energy Save, ES) and HS (High Speed) clocks */
	d->lp_freq = clk_round_rate(d->lp_clk, lp_freq);
	ret = clk_set_rate(d->lp_clk, d->lp_freq);
	if (ret)
		dev_err(d->dev, "failed to set LP clock rate %lu Hz\n",
			d->lp_freq);

	d->hs_freq = clk_round_rate(d->hs_clk, hs_freq);
	ret = clk_set_rate(d->hs_clk, d->hs_freq);
	if (ret)
		dev_err(d->dev, "failed to set HS clock rate %lu Hz\n",
			d->hs_freq);

	/* Start clocks */
	ret = clk_prepare_enable(d->lp_clk);
	if (ret)
		dev_err(d->dev, "failed to enable LP clock\n");
	else
		dev_info(d->dev, "DSI LP clock rate %lu Hz\n",
			 d->lp_freq);
	ret = clk_prepare_enable(d->hs_clk);
	if (ret)
		dev_err(d->dev, "failed to enable HS clock\n");
	else
		dev_info(d->dev, "DSI HS clock rate %lu Hz\n",
			 d->hs_freq);

	/* Assert RESET through the PRCMU, active low */
	/* FIXME: which DSI block? */
	regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
			   PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);

	usleep_range(100, 200);

	/* De-assert RESET again */
	regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
			   PRCM_DSI_SW_RESET_DSI0_SW_RESETN,
			   PRCM_DSI_SW_RESET_DSI0_SW_RESETN);

	/* Start up the hardware */
	mcde_dsi_start(d);

	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
		/* Set up the video mode from the DRM mode */
		mcde_dsi_setup_video_mode(d, d->mode);

		/* Put IF1 into video mode */
		val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
		val |= DSI_MCTL_MAIN_DATA_CTL_IF1_MODE;
		writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);

		/* Disable command mode on IF1 */
		val = readl(d->regs + DSI_CMD_MODE_CTL);
		val &= ~DSI_CMD_MODE_CTL_IF1_LP_EN;
		writel(val, d->regs + DSI_CMD_MODE_CTL);

		/* Enable some error interrupts */
		val = readl(d->regs + DSI_VID_MODE_STS_CTL);
		val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_VSYNC;
		val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_DATA;
		writel(val, d->regs + DSI_VID_MODE_STS_CTL);

		/* Enable video mode */
		val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
		val |= DSI_MCTL_MAIN_DATA_CTL_VID_EN;
		writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
	} else {
		/* Command mode, clear IF1 ID */
		val = readl(d->regs + DSI_CMD_MODE_CTL);
		/*
		 * If we enable low-power mode here
		 * the display updates become really slow.
		 */
		if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM)
			val |= DSI_CMD_MODE_CTL_IF1_LP_EN;
		val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK;
		writel(val, d->regs + DSI_CMD_MODE_CTL);
	}

	dev_info(d->dev, "enabled MCDE DSI master\n");
}

static void mcde_dsi_bridge_mode_set(struct drm_bridge *bridge,
				     const struct drm_display_mode *mode,
				     const struct drm_display_mode *adj)
{
	struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);

	if (!d->mdsi) {
		dev_err(d->dev, "no DSI device attached to encoder!\n");
		return;
	}

	d->mode = mode;

	dev_info(d->dev, "set DSI master to %dx%d %u Hz %s mode\n",
		 mode->hdisplay, mode->vdisplay, mode->clock * 1000,
		 (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ? "VIDEO" : "CMD"
		);
}

static void mcde_dsi_wait_for_command_mode_stop(struct mcde_dsi *d)
{
	u32 val;
	int i;

	/*
	 * Wait until we get out of command mode
	 * CSM = Command State Machine
	 */
	i = 0;
	val = DSI_CMD_MODE_STS_CSM_RUNNING;
	while ((readl(d->regs + DSI_CMD_MODE_STS) & val) == val) {
		/* Sleep for a millisecond */
		usleep_range(1000, 2000);
		if (i++ == 100) {
			dev_warn(d->dev,
				 "could not get out of command mode\n");
			return;
		}
	}
}

static void mcde_dsi_wait_for_video_mode_stop(struct mcde_dsi *d)
{
	u32 val;
	int i;

	/* Wait until we get out og video mode */
	i = 0;
	val = DSI_VID_MODE_STS_VSG_RUNNING;
	while ((readl(d->regs + DSI_VID_MODE_STS) & val) == val) {
		/* Sleep for a millisecond */
		usleep_range(1000, 2000);
		if (i++ == 100) {
			dev_warn(d->dev,
				 "could not get out of video mode\n");
			return;
		}
	}
}

/*
 * Notice that this is called from inside the display controller
 * and not from the bridge callbacks.
 */
void mcde_dsi_disable(struct drm_bridge *bridge)
{
	struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
	u32 val;

	if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
		/* Stop video mode */
		val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
		val &= ~DSI_MCTL_MAIN_DATA_CTL_VID_EN;
		writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
		mcde_dsi_wait_for_video_mode_stop(d);
	} else {
		/* Stop command mode */
		mcde_dsi_wait_for_command_mode_stop(d);
	}

	/*
	 * Stop clocks and terminate any DSI traffic here so the panel can
	 * send commands to shut down the display using DSI direct write until
	 * this point.
	 */

	/* Disable all error interrupts */
	writel(0, d->regs + DSI_VID_MODE_STS_CTL);
	clk_disable_unprepare(d->hs_clk);
	clk_disable_unprepare(d->lp_clk);
}

static int mcde_dsi_bridge_attach(struct drm_bridge *bridge,
				  enum drm_bridge_attach_flags flags)
{
	struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
	struct drm_device *drm = bridge->dev;
	int ret;

	if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
		dev_err(d->dev, "we need atomic updates\n");
		return -ENOTSUPP;
	}

	/* Attach the DSI bridge to the output (panel etc) bridge */
	ret = drm_bridge_attach(bridge->encoder, d->bridge_out, bridge, flags);
	if (ret) {
		dev_err(d->dev, "failed to attach the DSI bridge\n");
		return ret;
	}

	return 0;
}

static const struct drm_bridge_funcs mcde_dsi_bridge_funcs = {
	.attach = mcde_dsi_bridge_attach,
	.mode_set = mcde_dsi_bridge_mode_set,
};

static int mcde_dsi_bind(struct device *dev, struct device *master,
			 void *data)
{
	struct drm_device *drm = data;
	struct mcde *mcde = to_mcde(drm);
	struct mcde_dsi *d = dev_get_drvdata(dev);
	struct device_node *child;
	struct drm_panel *panel = NULL;
	struct drm_bridge *bridge = NULL;

	if (!of_get_available_child_count(dev->of_node)) {
		dev_info(dev, "unused DSI interface\n");
		d->unused = true;
		return 0;
	}
	d->mcde = mcde;
	/* If the display attached before binding, set this up */
	if (d->mdsi)
		mcde_dsi_attach_to_mcde(d);

	/* Obtain the clocks */
	d->hs_clk = devm_clk_get(dev, "hs");
	if (IS_ERR(d->hs_clk)) {
		dev_err(dev, "unable to get HS clock\n");
		return PTR_ERR(d->hs_clk);
	}

	d->lp_clk = devm_clk_get(dev, "lp");
	if (IS_ERR(d->lp_clk)) {
		dev_err(dev, "unable to get LP clock\n");
		return PTR_ERR(d->lp_clk);
	}

	/* Look for a panel as a child to this node */
	for_each_available_child_of_node(dev->of_node, child) {
		panel = of_drm_find_panel(child);
		if (IS_ERR(panel)) {
			dev_err(dev, "failed to find panel try bridge (%ld)\n",
				PTR_ERR(panel));
			panel = NULL;

			bridge = of_drm_find_bridge(child);
			if (!bridge) {
				dev_err(dev, "failed to find bridge\n");
				return -EINVAL;
			}
		}
	}
	if (panel) {
		bridge = drm_panel_bridge_add_typed(panel,
						    DRM_MODE_CONNECTOR_DSI);
		if (IS_ERR(bridge)) {
			dev_err(dev, "error adding panel bridge\n");
			return PTR_ERR(bridge);
		}
		dev_info(dev, "connected to panel\n");
		d->panel = panel;
	} else if (bridge) {
		/* TODO: AV8100 HDMI encoder goes here for example */
		dev_info(dev, "connected to non-panel bridge (unsupported)\n");
		return -ENODEV;
	} else {
		dev_err(dev, "no panel or bridge\n");
		return -ENODEV;
	}

	d->bridge_out = bridge;

	/* Create a bridge for this DSI channel */
	d->bridge.funcs = &mcde_dsi_bridge_funcs;
	d->bridge.of_node = dev->of_node;
	drm_bridge_add(&d->bridge);

	/* TODO: first come first serve, use a list */
	mcde->bridge = &d->bridge;

	dev_info(dev, "initialized MCDE DSI bridge\n");

	return 0;
}

static void mcde_dsi_unbind(struct device *dev, struct device *master,
			    void *data)
{
	struct mcde_dsi *d = dev_get_drvdata(dev);

	if (d->panel)
		drm_panel_bridge_remove(d->bridge_out);
	regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
			   PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);
}

static const struct component_ops mcde_dsi_component_ops = {
	.bind   = mcde_dsi_bind,
	.unbind = mcde_dsi_unbind,
};

static int mcde_dsi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mcde_dsi *d;
	struct mipi_dsi_host *host;
	struct resource *res;
	u32 dsi_id;
	int ret;

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

	/* Get a handle on the PRCMU so we can do reset */
	d->prcmu =
		syscon_regmap_lookup_by_compatible("stericsson,db8500-prcmu");
	if (IS_ERR(d->prcmu)) {
		dev_err(dev, "no PRCMU regmap\n");
		return PTR_ERR(d->prcmu);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	d->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(d->regs)) {
		dev_err(dev, "no DSI regs\n");
		return PTR_ERR(d->regs);
	}

	dsi_id = readl(d->regs + DSI_ID_REG);
	dev_info(dev, "HW revision 0x%08x\n", dsi_id);

	host = &d->dsi_host;
	host->dev = dev;
	host->ops = &mcde_dsi_host_ops;
	ret = mipi_dsi_host_register(host);
	if (ret < 0) {
		dev_err(dev, "failed to register DSI host: %d\n", ret);
		return ret;
	}
	dev_info(dev, "registered DSI host\n");

	platform_set_drvdata(pdev, d);
	return component_add(dev, &mcde_dsi_component_ops);
}

static int mcde_dsi_remove(struct platform_device *pdev)
{
	struct mcde_dsi *d = platform_get_drvdata(pdev);

	component_del(&pdev->dev, &mcde_dsi_component_ops);
	mipi_dsi_host_unregister(&d->dsi_host);

	return 0;
}

static const struct of_device_id mcde_dsi_of_match[] = {
	{
		.compatible = "ste,mcde-dsi",
	},
	{},
};

struct platform_driver mcde_dsi_driver = {
	.driver = {
		.name           = "mcde-dsi",
		.of_match_table = of_match_ptr(mcde_dsi_of_match),
	},
	.probe = mcde_dsi_probe,
	.remove = mcde_dsi_remove,
};