summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/sti/sti_hdmi.c
blob: c9151849d604f89820058f344198b2a0b2e8904f (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
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
/*
 * Copyright (C) STMicroelectronics SA 2014
 * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/debugfs.h>
#include <linux/hdmi.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>

#include <sound/hdmi-codec.h>

#include "sti_hdmi.h"
#include "sti_hdmi_tx3g4c28phy.h"
#include "sti_vtg.h"

#define HDMI_CFG                        0x0000
#define HDMI_INT_EN                     0x0004
#define HDMI_INT_STA                    0x0008
#define HDMI_INT_CLR                    0x000C
#define HDMI_STA                        0x0010
#define HDMI_ACTIVE_VID_XMIN            0x0100
#define HDMI_ACTIVE_VID_XMAX            0x0104
#define HDMI_ACTIVE_VID_YMIN            0x0108
#define HDMI_ACTIVE_VID_YMAX            0x010C
#define HDMI_DFLT_CHL0_DAT              0x0110
#define HDMI_DFLT_CHL1_DAT              0x0114
#define HDMI_DFLT_CHL2_DAT              0x0118
#define HDMI_AUDIO_CFG                  0x0200
#define HDMI_SPDIF_FIFO_STATUS          0x0204
#define HDMI_SW_DI_1_HEAD_WORD          0x0210
#define HDMI_SW_DI_1_PKT_WORD0          0x0214
#define HDMI_SW_DI_1_PKT_WORD1          0x0218
#define HDMI_SW_DI_1_PKT_WORD2          0x021C
#define HDMI_SW_DI_1_PKT_WORD3          0x0220
#define HDMI_SW_DI_1_PKT_WORD4          0x0224
#define HDMI_SW_DI_1_PKT_WORD5          0x0228
#define HDMI_SW_DI_1_PKT_WORD6          0x022C
#define HDMI_SW_DI_CFG                  0x0230
#define HDMI_SAMPLE_FLAT_MASK           0x0244
#define HDMI_AUDN                       0x0400
#define HDMI_AUD_CTS                    0x0404
#define HDMI_SW_DI_2_HEAD_WORD          0x0600
#define HDMI_SW_DI_2_PKT_WORD0          0x0604
#define HDMI_SW_DI_2_PKT_WORD1          0x0608
#define HDMI_SW_DI_2_PKT_WORD2          0x060C
#define HDMI_SW_DI_2_PKT_WORD3          0x0610
#define HDMI_SW_DI_2_PKT_WORD4          0x0614
#define HDMI_SW_DI_2_PKT_WORD5          0x0618
#define HDMI_SW_DI_2_PKT_WORD6          0x061C
#define HDMI_SW_DI_3_HEAD_WORD          0x0620
#define HDMI_SW_DI_3_PKT_WORD0          0x0624
#define HDMI_SW_DI_3_PKT_WORD1          0x0628
#define HDMI_SW_DI_3_PKT_WORD2          0x062C
#define HDMI_SW_DI_3_PKT_WORD3          0x0630
#define HDMI_SW_DI_3_PKT_WORD4          0x0634
#define HDMI_SW_DI_3_PKT_WORD5          0x0638
#define HDMI_SW_DI_3_PKT_WORD6          0x063C

#define HDMI_IFRAME_SLOT_AVI            1
#define HDMI_IFRAME_SLOT_AUDIO          2
#define HDMI_IFRAME_SLOT_VENDOR         3

#define  XCAT(prefix, x, suffix)        prefix ## x ## suffix
#define  HDMI_SW_DI_N_HEAD_WORD(x)      XCAT(HDMI_SW_DI_, x, _HEAD_WORD)
#define  HDMI_SW_DI_N_PKT_WORD0(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD0)
#define  HDMI_SW_DI_N_PKT_WORD1(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD1)
#define  HDMI_SW_DI_N_PKT_WORD2(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD2)
#define  HDMI_SW_DI_N_PKT_WORD3(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD3)
#define  HDMI_SW_DI_N_PKT_WORD4(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD4)
#define  HDMI_SW_DI_N_PKT_WORD5(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD5)
#define  HDMI_SW_DI_N_PKT_WORD6(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD6)

#define HDMI_SW_DI_MAX_WORD             7

#define HDMI_IFRAME_DISABLED            0x0
#define HDMI_IFRAME_SINGLE_SHOT         0x1
#define HDMI_IFRAME_FIELD               0x2
#define HDMI_IFRAME_FRAME               0x3
#define HDMI_IFRAME_MASK                0x3
#define HDMI_IFRAME_CFG_DI_N(x, n)       ((x) << ((n-1)*4)) /* n from 1 to 6 */

#define HDMI_CFG_DEVICE_EN              BIT(0)
#define HDMI_CFG_HDMI_NOT_DVI           BIT(1)
#define HDMI_CFG_HDCP_EN                BIT(2)
#define HDMI_CFG_ESS_NOT_OESS           BIT(3)
#define HDMI_CFG_H_SYNC_POL_NEG         BIT(4)
#define HDMI_CFG_SINK_TERM_DET_EN       BIT(5)
#define HDMI_CFG_V_SYNC_POL_NEG         BIT(6)
#define HDMI_CFG_422_EN                 BIT(8)
#define HDMI_CFG_FIFO_OVERRUN_CLR       BIT(12)
#define HDMI_CFG_FIFO_UNDERRUN_CLR      BIT(13)
#define HDMI_CFG_SW_RST_EN              BIT(31)

#define HDMI_INT_GLOBAL                 BIT(0)
#define HDMI_INT_SW_RST                 BIT(1)
#define HDMI_INT_PIX_CAP                BIT(3)
#define HDMI_INT_HOT_PLUG               BIT(4)
#define HDMI_INT_DLL_LCK                BIT(5)
#define HDMI_INT_NEW_FRAME              BIT(6)
#define HDMI_INT_GENCTRL_PKT            BIT(7)
#define HDMI_INT_AUDIO_FIFO_XRUN        BIT(8)
#define HDMI_INT_SINK_TERM_PRESENT      BIT(11)

#define HDMI_DEFAULT_INT (HDMI_INT_SINK_TERM_PRESENT \
			| HDMI_INT_DLL_LCK \
			| HDMI_INT_HOT_PLUG \
			| HDMI_INT_GLOBAL)

#define HDMI_WORKING_INT (HDMI_INT_SINK_TERM_PRESENT \
			| HDMI_INT_AUDIO_FIFO_XRUN \
			| HDMI_INT_GENCTRL_PKT \
			| HDMI_INT_NEW_FRAME \
			| HDMI_INT_DLL_LCK \
			| HDMI_INT_HOT_PLUG \
			| HDMI_INT_PIX_CAP \
			| HDMI_INT_SW_RST \
			| HDMI_INT_GLOBAL)

#define HDMI_STA_SW_RST                 BIT(1)

#define HDMI_AUD_CFG_8CH		BIT(0)
#define HDMI_AUD_CFG_SPDIF_DIV_2	BIT(1)
#define HDMI_AUD_CFG_SPDIF_DIV_3	BIT(2)
#define HDMI_AUD_CFG_SPDIF_CLK_DIV_4	(BIT(1) | BIT(2))
#define HDMI_AUD_CFG_CTS_CLK_256FS	BIT(12)
#define HDMI_AUD_CFG_DTS_INVALID	BIT(16)
#define HDMI_AUD_CFG_ONE_BIT_INVALID	(BIT(18) | BIT(19) | BIT(20) |  BIT(21))
#define HDMI_AUD_CFG_CH12_VALID	BIT(28)
#define HDMI_AUD_CFG_CH34_VALID	BIT(29)
#define HDMI_AUD_CFG_CH56_VALID	BIT(30)
#define HDMI_AUD_CFG_CH78_VALID	BIT(31)

/* sample flat mask */
#define HDMI_SAMPLE_FLAT_NO	 0
#define HDMI_SAMPLE_FLAT_SP0 BIT(0)
#define HDMI_SAMPLE_FLAT_SP1 BIT(1)
#define HDMI_SAMPLE_FLAT_SP2 BIT(2)
#define HDMI_SAMPLE_FLAT_SP3 BIT(3)
#define HDMI_SAMPLE_FLAT_ALL (HDMI_SAMPLE_FLAT_SP0 | HDMI_SAMPLE_FLAT_SP1 |\
			      HDMI_SAMPLE_FLAT_SP2 | HDMI_SAMPLE_FLAT_SP3)

#define HDMI_INFOFRAME_HEADER_TYPE(x)    (((x) & 0xff) <<  0)
#define HDMI_INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) <<  8)
#define HDMI_INFOFRAME_HEADER_LEN(x)     (((x) & 0x0f) << 16)

struct sti_hdmi_connector {
	struct drm_connector drm_connector;
	struct drm_encoder *encoder;
	struct sti_hdmi *hdmi;
	struct drm_property *colorspace_property;
	struct drm_property *hdmi_mode_property;
};

#define to_sti_hdmi_connector(x) \
	container_of(x, struct sti_hdmi_connector, drm_connector)

u32 hdmi_read(struct sti_hdmi *hdmi, int offset)
{
	return readl(hdmi->regs + offset);
}

void hdmi_write(struct sti_hdmi *hdmi, u32 val, int offset)
{
	writel(val, hdmi->regs + offset);
}

/**
 * HDMI interrupt handler threaded
 *
 * @irq: irq number
 * @arg: connector structure
 */
static irqreturn_t hdmi_irq_thread(int irq, void *arg)
{
	struct sti_hdmi *hdmi = arg;

	/* Hot plug/unplug IRQ */
	if (hdmi->irq_status & HDMI_INT_HOT_PLUG) {
		hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
		if (hdmi->drm_dev)
			drm_helper_hpd_irq_event(hdmi->drm_dev);
	}

	/* Sw reset and PLL lock are exclusive so we can use the same
	 * event to signal them
	 */
	if (hdmi->irq_status & (HDMI_INT_SW_RST | HDMI_INT_DLL_LCK)) {
		hdmi->event_received = true;
		wake_up_interruptible(&hdmi->wait_event);
	}

	/* Audio FIFO underrun IRQ */
	if (hdmi->irq_status & HDMI_INT_AUDIO_FIFO_XRUN)
		DRM_INFO("Warning: audio FIFO underrun occurs!\n");

	return IRQ_HANDLED;
}

/**
 * HDMI interrupt handler
 *
 * @irq: irq number
 * @arg: connector structure
 */
static irqreturn_t hdmi_irq(int irq, void *arg)
{
	struct sti_hdmi *hdmi = arg;

	/* read interrupt status */
	hdmi->irq_status = hdmi_read(hdmi, HDMI_INT_STA);

	/* clear interrupt status */
	hdmi_write(hdmi, hdmi->irq_status, HDMI_INT_CLR);

	/* force sync bus write */
	hdmi_read(hdmi, HDMI_INT_STA);

	return IRQ_WAKE_THREAD;
}

/**
 * Set hdmi active area depending on the drm display mode selected
 *
 * @hdmi: pointer on the hdmi internal structure
 */
static void hdmi_active_area(struct sti_hdmi *hdmi)
{
	u32 xmin, xmax;
	u32 ymin, ymax;

	xmin = sti_vtg_get_pixel_number(hdmi->mode, 1);
	xmax = sti_vtg_get_pixel_number(hdmi->mode, hdmi->mode.hdisplay);
	ymin = sti_vtg_get_line_number(hdmi->mode, 0);
	ymax = sti_vtg_get_line_number(hdmi->mode, hdmi->mode.vdisplay - 1);

	hdmi_write(hdmi, xmin, HDMI_ACTIVE_VID_XMIN);
	hdmi_write(hdmi, xmax, HDMI_ACTIVE_VID_XMAX);
	hdmi_write(hdmi, ymin, HDMI_ACTIVE_VID_YMIN);
	hdmi_write(hdmi, ymax, HDMI_ACTIVE_VID_YMAX);
}

/**
 * Overall hdmi configuration
 *
 * @hdmi: pointer on the hdmi internal structure
 */
static void hdmi_config(struct sti_hdmi *hdmi)
{
	u32 conf;

	DRM_DEBUG_DRIVER("\n");

	/* Clear overrun and underrun fifo */
	conf = HDMI_CFG_FIFO_OVERRUN_CLR | HDMI_CFG_FIFO_UNDERRUN_CLR;

	/* Select encryption type and the framing mode */
	conf |= HDMI_CFG_ESS_NOT_OESS;
	if (hdmi->hdmi_mode == HDMI_MODE_HDMI)
		conf |= HDMI_CFG_HDMI_NOT_DVI;

	/* Enable sink term detection */
	conf |= HDMI_CFG_SINK_TERM_DET_EN;

	/* Set Hsync polarity */
	if (hdmi->mode.flags & DRM_MODE_FLAG_NHSYNC) {
		DRM_DEBUG_DRIVER("H Sync Negative\n");
		conf |= HDMI_CFG_H_SYNC_POL_NEG;
	}

	/* Set Vsync polarity */
	if (hdmi->mode.flags & DRM_MODE_FLAG_NVSYNC) {
		DRM_DEBUG_DRIVER("V Sync Negative\n");
		conf |= HDMI_CFG_V_SYNC_POL_NEG;
	}

	/* Enable HDMI */
	conf |= HDMI_CFG_DEVICE_EN;

	hdmi_write(hdmi, conf, HDMI_CFG);
}

/*
 * Helper to reset info frame
 *
 * @hdmi: pointer on the hdmi internal structure
 * @slot: infoframe to reset
 */
static void hdmi_infoframe_reset(struct sti_hdmi *hdmi,
				 u32 slot)
{
	u32 val, i;
	u32 head_offset, pack_offset;

	switch (slot) {
	case HDMI_IFRAME_SLOT_AVI:
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
		break;
	case HDMI_IFRAME_SLOT_AUDIO:
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
		break;
	case HDMI_IFRAME_SLOT_VENDOR:
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_VENDOR);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_VENDOR);
		break;
	default:
		DRM_ERROR("unsupported infoframe slot: %#x\n", slot);
		return;
	}

	/* Disable transmission for the selected slot */
	val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
	val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
	hdmi_write(hdmi, val, HDMI_SW_DI_CFG);

	/* Reset info frame registers */
	hdmi_write(hdmi, 0x0, head_offset);
	for (i = 0; i < HDMI_SW_DI_MAX_WORD; i += sizeof(u32))
		hdmi_write(hdmi, 0x0, pack_offset + i);
}

/**
 * Helper to concatenate infoframe in 32 bits word
 *
 * @ptr: pointer on the hdmi internal structure
 * @data: infoframe to write
 * @size: size to write
 */
static inline unsigned int hdmi_infoframe_subpack(const u8 *ptr, size_t size)
{
	unsigned long value = 0;
	size_t i;

	for (i = size; i > 0; i--)
		value = (value << 8) | ptr[i - 1];

	return value;
}

/**
 * Helper to write info frame
 *
 * @hdmi: pointer on the hdmi internal structure
 * @data: infoframe to write
 * @size: size to write
 */
static void hdmi_infoframe_write_infopack(struct sti_hdmi *hdmi,
					  const u8 *data,
					  size_t size)
{
	const u8 *ptr = data;
	u32 val, slot, mode, i;
	u32 head_offset, pack_offset;

	switch (*ptr) {
	case HDMI_INFOFRAME_TYPE_AVI:
		slot = HDMI_IFRAME_SLOT_AVI;
		mode = HDMI_IFRAME_FIELD;
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
		break;
	case HDMI_INFOFRAME_TYPE_AUDIO:
		slot = HDMI_IFRAME_SLOT_AUDIO;
		mode = HDMI_IFRAME_FRAME;
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
		break;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		slot = HDMI_IFRAME_SLOT_VENDOR;
		mode = HDMI_IFRAME_FRAME;
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_VENDOR);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_VENDOR);
		break;
	default:
		DRM_ERROR("unsupported infoframe type: %#x\n", *ptr);
		return;
	}

	/* Disable transmission slot for updated infoframe */
	val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
	val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
	hdmi_write(hdmi, val, HDMI_SW_DI_CFG);

	val = HDMI_INFOFRAME_HEADER_TYPE(*ptr++);
	val |= HDMI_INFOFRAME_HEADER_VERSION(*ptr++);
	val |= HDMI_INFOFRAME_HEADER_LEN(*ptr++);
	writel(val, hdmi->regs + head_offset);

	/*
	 * Each subpack contains 4 bytes
	 * The First Bytes of the first subpacket must contain the checksum
	 * Packet size is increase by one.
	 */
	size = size - HDMI_INFOFRAME_HEADER_SIZE + 1;
	for (i = 0; i < size; i += sizeof(u32)) {
		size_t num;

		num = min_t(size_t, size - i, sizeof(u32));
		val = hdmi_infoframe_subpack(ptr, num);
		ptr += sizeof(u32);
		writel(val, hdmi->regs + pack_offset + i);
	}

	/* Enable transmission slot for updated infoframe */
	val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
	val |= HDMI_IFRAME_CFG_DI_N(mode, slot);
	hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
}

/**
 * Prepare and configure the AVI infoframe
 *
 * AVI infoframe are transmitted at least once per two video field and
 * contains information about HDMI transmission mode such as color space,
 * colorimetry, ...
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 * Return negative value if error occurs
 */
static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
{
	struct drm_display_mode *mode = &hdmi->mode;
	struct hdmi_avi_infoframe infoframe;
	u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
	int ret;

	DRM_DEBUG_DRIVER("\n");

	ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe, mode);
	if (ret < 0) {
		DRM_ERROR("failed to setup AVI infoframe: %d\n", ret);
		return ret;
	}

	/* fixed infoframe configuration not linked to the mode */
	infoframe.colorspace = hdmi->colorspace;
	infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
	infoframe.colorimetry = HDMI_COLORIMETRY_NONE;

	ret = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
	if (ret < 0) {
		DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
		return ret;
	}

	hdmi_infoframe_write_infopack(hdmi, buffer, ret);

	return 0;
}

/**
 * Prepare and configure the AUDIO infoframe
 *
 * AUDIO infoframe are transmitted once per frame and
 * contains information about HDMI transmission mode such as audio codec,
 * sample size, ...
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 * Return negative value if error occurs
 */
static int hdmi_audio_infoframe_config(struct sti_hdmi *hdmi)
{
	struct hdmi_audio_params *audio = &hdmi->audio;
	u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
	int ret, val;

	DRM_DEBUG_DRIVER("enter %s, AIF %s\n", __func__,
			 audio->enabled ? "enable" : "disable");
	if (audio->enabled) {
		/* set audio parameters stored*/
		ret = hdmi_audio_infoframe_pack(&audio->cea, buffer,
						sizeof(buffer));
		if (ret < 0) {
			DRM_ERROR("failed to pack audio infoframe: %d\n", ret);
			return ret;
		}
		hdmi_infoframe_write_infopack(hdmi, buffer, ret);
	} else {
		/*disable audio info frame transmission */
		val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
		val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK,
					     HDMI_IFRAME_SLOT_AUDIO);
		hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
	}

	return 0;
}

/*
 * Prepare and configure the VS infoframe
 *
 * Vendor Specific infoframe are transmitted once per frame and
 * contains vendor specific information.
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 * Return negative value if error occurs
 */
#define HDMI_VENDOR_INFOFRAME_MAX_SIZE 6
static int hdmi_vendor_infoframe_config(struct sti_hdmi *hdmi)
{
	struct drm_display_mode *mode = &hdmi->mode;
	struct hdmi_vendor_infoframe infoframe;
	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_VENDOR_INFOFRAME_MAX_SIZE];
	int ret;

	DRM_DEBUG_DRIVER("\n");

	ret = drm_hdmi_vendor_infoframe_from_display_mode(&infoframe, mode);
	if (ret < 0) {
		/*
		 * Going into that statement does not means vendor infoframe
		 * fails. It just informed us that vendor infoframe is not
		 * needed for the selected mode. Only  4k or stereoscopic 3D
		 * mode requires vendor infoframe. So just simply return 0.
		 */
		return 0;
	}

	ret = hdmi_vendor_infoframe_pack(&infoframe, buffer, sizeof(buffer));
	if (ret < 0) {
		DRM_ERROR("failed to pack VS infoframe: %d\n", ret);
		return ret;
	}

	hdmi_infoframe_write_infopack(hdmi, buffer, ret);

	return 0;
}

/**
 * Software reset of the hdmi subsystem
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 */
#define HDMI_TIMEOUT_SWRESET  100   /*milliseconds */
static void hdmi_swreset(struct sti_hdmi *hdmi)
{
	u32 val;

	DRM_DEBUG_DRIVER("\n");

	/* Enable hdmi_audio clock only during hdmi reset */
	if (clk_prepare_enable(hdmi->clk_audio))
		DRM_INFO("Failed to prepare/enable hdmi_audio clk\n");

	/* Sw reset */
	hdmi->event_received = false;

	val = hdmi_read(hdmi, HDMI_CFG);
	val |= HDMI_CFG_SW_RST_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	/* Wait reset completed */
	wait_event_interruptible_timeout(hdmi->wait_event,
					 hdmi->event_received,
					 msecs_to_jiffies
					 (HDMI_TIMEOUT_SWRESET));

	/*
	 * HDMI_STA_SW_RST bit is set to '1' when SW_RST bit in HDMI_CFG is
	 * set to '1' and clk_audio is running.
	 */
	if ((hdmi_read(hdmi, HDMI_STA) & HDMI_STA_SW_RST) == 0)
		DRM_DEBUG_DRIVER("Warning: HDMI sw reset timeout occurs\n");

	val = hdmi_read(hdmi, HDMI_CFG);
	val &= ~HDMI_CFG_SW_RST_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	/* Disable hdmi_audio clock. Not used anymore for drm purpose */
	clk_disable_unprepare(hdmi->clk_audio);
}

#define DBGFS_PRINT_STR(str1, str2) seq_printf(s, "%-24s %s\n", str1, str2)
#define DBGFS_PRINT_INT(str1, int2) seq_printf(s, "%-24s %d\n", str1, int2)
#define DBGFS_DUMP(str, reg) seq_printf(s, "%s  %-25s 0x%08X", str, #reg, \
					hdmi_read(hdmi, reg))
#define DBGFS_DUMP_DI(reg, slot) DBGFS_DUMP("\n", reg(slot))

static void hdmi_dbg_cfg(struct seq_file *s, int val)
{
	int tmp;

	seq_puts(s, "\t");
	tmp = val & HDMI_CFG_HDMI_NOT_DVI;
	DBGFS_PRINT_STR("mode:", tmp ? "HDMI" : "DVI");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_HDCP_EN;
	DBGFS_PRINT_STR("HDCP:", tmp ? "enable" : "disable");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_ESS_NOT_OESS;
	DBGFS_PRINT_STR("HDCP mode:", tmp ? "ESS enable" : "OESS enable");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_SINK_TERM_DET_EN;
	DBGFS_PRINT_STR("Sink term detection:", tmp ? "enable" : "disable");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_H_SYNC_POL_NEG;
	DBGFS_PRINT_STR("Hsync polarity:", tmp ? "inverted" : "normal");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_V_SYNC_POL_NEG;
	DBGFS_PRINT_STR("Vsync polarity:", tmp ? "inverted" : "normal");
	seq_puts(s, "\t\t\t\t\t");
	tmp = val & HDMI_CFG_422_EN;
	DBGFS_PRINT_STR("YUV422 format:", tmp ? "enable" : "disable");
}

static void hdmi_dbg_sta(struct seq_file *s, int val)
{
	int tmp;

	seq_puts(s, "\t");
	tmp = (val & HDMI_STA_DLL_LCK);
	DBGFS_PRINT_STR("pll:", tmp ? "locked" : "not locked");
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_STA_HOT_PLUG);
	DBGFS_PRINT_STR("hdmi cable:", tmp ? "connected" : "not connected");
}

static void hdmi_dbg_sw_di_cfg(struct seq_file *s, int val)
{
	int tmp;
	char *const en_di[] = {"no transmission",
			       "single transmission",
			       "once every field",
			       "once every frame"};

	seq_puts(s, "\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 1));
	DBGFS_PRINT_STR("Data island 1:", en_di[tmp]);
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 2)) >> 4;
	DBGFS_PRINT_STR("Data island 2:", en_di[tmp]);
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 3)) >> 8;
	DBGFS_PRINT_STR("Data island 3:", en_di[tmp]);
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 4)) >> 12;
	DBGFS_PRINT_STR("Data island 4:", en_di[tmp]);
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 5)) >> 16;
	DBGFS_PRINT_STR("Data island 5:", en_di[tmp]);
	seq_puts(s, "\t\t\t\t\t");
	tmp = (val & HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, 6)) >> 20;
	DBGFS_PRINT_STR("Data island 6:", en_di[tmp]);
}

static int hdmi_dbg_show(struct seq_file *s, void *data)
{
	struct drm_info_node *node = s->private;
	struct sti_hdmi *hdmi = (struct sti_hdmi *)node->info_ent->data;

	seq_printf(s, "HDMI: (vaddr = 0x%p)", hdmi->regs);
	DBGFS_DUMP("\n", HDMI_CFG);
	hdmi_dbg_cfg(s, hdmi_read(hdmi, HDMI_CFG));
	DBGFS_DUMP("", HDMI_INT_EN);
	DBGFS_DUMP("\n", HDMI_STA);
	hdmi_dbg_sta(s, hdmi_read(hdmi, HDMI_STA));
	DBGFS_DUMP("", HDMI_ACTIVE_VID_XMIN);
	seq_puts(s, "\t");
	DBGFS_PRINT_INT("Xmin:", hdmi_read(hdmi, HDMI_ACTIVE_VID_XMIN));
	DBGFS_DUMP("", HDMI_ACTIVE_VID_XMAX);
	seq_puts(s, "\t");
	DBGFS_PRINT_INT("Xmax:", hdmi_read(hdmi, HDMI_ACTIVE_VID_XMAX));
	DBGFS_DUMP("", HDMI_ACTIVE_VID_YMIN);
	seq_puts(s, "\t");
	DBGFS_PRINT_INT("Ymin:", hdmi_read(hdmi, HDMI_ACTIVE_VID_YMIN));
	DBGFS_DUMP("", HDMI_ACTIVE_VID_YMAX);
	seq_puts(s, "\t");
	DBGFS_PRINT_INT("Ymax:", hdmi_read(hdmi, HDMI_ACTIVE_VID_YMAX));
	DBGFS_DUMP("", HDMI_SW_DI_CFG);
	hdmi_dbg_sw_di_cfg(s, hdmi_read(hdmi, HDMI_SW_DI_CFG));

	DBGFS_DUMP("\n", HDMI_AUDIO_CFG);
	DBGFS_DUMP("\n", HDMI_SPDIF_FIFO_STATUS);
	DBGFS_DUMP("\n", HDMI_AUDN);

	seq_printf(s, "\n AVI Infoframe (Data Island slot N=%d):",
		   HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_HEAD_WORD, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD0, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD1, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD2, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD3, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD4, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD5, HDMI_IFRAME_SLOT_AVI);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD6, HDMI_IFRAME_SLOT_AVI);
	seq_puts(s, "\n");
	seq_printf(s, "\n AUDIO Infoframe (Data Island slot N=%d):",
		   HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_HEAD_WORD, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD0, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD1, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD2, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD3, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD4, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD5, HDMI_IFRAME_SLOT_AUDIO);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD6, HDMI_IFRAME_SLOT_AUDIO);
	seq_puts(s, "\n");
	seq_printf(s, "\n VENDOR SPECIFIC Infoframe (Data Island slot N=%d):",
		   HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_HEAD_WORD, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD0, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD1, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD2, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD3, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD4, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD5, HDMI_IFRAME_SLOT_VENDOR);
	DBGFS_DUMP_DI(HDMI_SW_DI_N_PKT_WORD6, HDMI_IFRAME_SLOT_VENDOR);
	seq_puts(s, "\n");

	return 0;
}

static struct drm_info_list hdmi_debugfs_files[] = {
	{ "hdmi", hdmi_dbg_show, 0, NULL },
};

static int hdmi_debugfs_init(struct sti_hdmi *hdmi, struct drm_minor *minor)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(hdmi_debugfs_files); i++)
		hdmi_debugfs_files[i].data = hdmi;

	return drm_debugfs_create_files(hdmi_debugfs_files,
					ARRAY_SIZE(hdmi_debugfs_files),
					minor->debugfs_root, minor);
}

static void sti_hdmi_disable(struct drm_bridge *bridge)
{
	struct sti_hdmi *hdmi = bridge->driver_private;

	u32 val = hdmi_read(hdmi, HDMI_CFG);

	if (!hdmi->enabled)
		return;

	DRM_DEBUG_DRIVER("\n");

	/* Disable HDMI */
	val &= ~HDMI_CFG_DEVICE_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	hdmi_write(hdmi, 0xffffffff, HDMI_INT_CLR);

	/* Stop the phy */
	hdmi->phy_ops->stop(hdmi);

	/* Reset info frame transmission */
	hdmi_infoframe_reset(hdmi, HDMI_IFRAME_SLOT_AVI);
	hdmi_infoframe_reset(hdmi, HDMI_IFRAME_SLOT_AUDIO);
	hdmi_infoframe_reset(hdmi, HDMI_IFRAME_SLOT_VENDOR);

	/* Set the default channel data to be a dark red */
	hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL0_DAT);
	hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL1_DAT);
	hdmi_write(hdmi, 0x0060, HDMI_DFLT_CHL2_DAT);

	/* Disable/unprepare hdmi clock */
	clk_disable_unprepare(hdmi->clk_phy);
	clk_disable_unprepare(hdmi->clk_tmds);
	clk_disable_unprepare(hdmi->clk_pix);

	hdmi->enabled = false;
}

/**
 * sti_hdmi_audio_get_non_coherent_n() - get N parameter for non-coherent
 * clocks. None-coherent clocks means that audio and TMDS clocks have not the
 * same source (drifts between clocks). In this case assumption is that CTS is
 * automatically calculated by hardware.
 *
 * @audio_fs: audio frame clock frequency in Hz
 *
 * Values computed are based on table described in HDMI specification 1.4b
 *
 * Returns n value.
 */
static int sti_hdmi_audio_get_non_coherent_n(unsigned int audio_fs)
{
	unsigned int n;

	switch (audio_fs) {
	case 32000:
		n = 4096;
		break;
	case 44100:
		n = 6272;
		break;
	case 48000:
		n = 6144;
		break;
	case 88200:
		n = 6272 * 2;
		break;
	case 96000:
		n = 6144 * 2;
		break;
	case 176400:
		n = 6272 * 4;
		break;
	case 192000:
		n = 6144 * 4;
		break;
	default:
		/* Not pre-defined, recommended value: 128 * fs / 1000 */
		n = (audio_fs * 128) / 1000;
	}

	return n;
}

static int hdmi_audio_configure(struct sti_hdmi *hdmi)
{
	int audio_cfg, n;
	struct hdmi_audio_params *params = &hdmi->audio;
	struct hdmi_audio_infoframe *info = &params->cea;

	DRM_DEBUG_DRIVER("\n");

	if (!hdmi->enabled)
		return 0;

	/* update N parameter */
	n = sti_hdmi_audio_get_non_coherent_n(params->sample_rate);

	DRM_DEBUG_DRIVER("Audio rate = %d Hz, TMDS clock = %d Hz, n = %d\n",
			 params->sample_rate, hdmi->mode.clock * 1000, n);
	hdmi_write(hdmi, n, HDMI_AUDN);

	/* update HDMI registers according to configuration */
	audio_cfg = HDMI_AUD_CFG_SPDIF_DIV_2 | HDMI_AUD_CFG_DTS_INVALID |
		    HDMI_AUD_CFG_ONE_BIT_INVALID;

	switch (info->channels) {
	case 8:
		audio_cfg |= HDMI_AUD_CFG_CH78_VALID;
	case 6:
		audio_cfg |= HDMI_AUD_CFG_CH56_VALID;
	case 4:
		audio_cfg |= HDMI_AUD_CFG_CH34_VALID | HDMI_AUD_CFG_8CH;
	case 2:
		audio_cfg |= HDMI_AUD_CFG_CH12_VALID;
		break;
	default:
		DRM_ERROR("ERROR: Unsupported number of channels (%d)!\n",
			  info->channels);
		return -EINVAL;
	}

	hdmi_write(hdmi, audio_cfg, HDMI_AUDIO_CFG);

	return hdmi_audio_infoframe_config(hdmi);
}

static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
{
	struct sti_hdmi *hdmi = bridge->driver_private;

	DRM_DEBUG_DRIVER("\n");

	if (hdmi->enabled)
		return;

	/* Prepare/enable clocks */
	if (clk_prepare_enable(hdmi->clk_pix))
		DRM_ERROR("Failed to prepare/enable hdmi_pix clk\n");
	if (clk_prepare_enable(hdmi->clk_tmds))
		DRM_ERROR("Failed to prepare/enable hdmi_tmds clk\n");
	if (clk_prepare_enable(hdmi->clk_phy))
		DRM_ERROR("Failed to prepare/enable hdmi_rejec_pll clk\n");

	hdmi->enabled = true;

	/* Program hdmi serializer and start phy */
	if (!hdmi->phy_ops->start(hdmi)) {
		DRM_ERROR("Unable to start hdmi phy\n");
		return;
	}

	/* Program hdmi active area */
	hdmi_active_area(hdmi);

	/* Enable working interrupts */
	hdmi_write(hdmi, HDMI_WORKING_INT, HDMI_INT_EN);

	/* Program hdmi config */
	hdmi_config(hdmi);

	/* Program AVI infoframe */
	if (hdmi_avi_infoframe_config(hdmi))
		DRM_ERROR("Unable to configure AVI infoframe\n");

	if (hdmi->audio.enabled) {
		if (hdmi_audio_configure(hdmi))
			DRM_ERROR("Unable to configure audio\n");
	} else {
		hdmi_audio_infoframe_config(hdmi);
	}

	/* Program VS infoframe */
	if (hdmi_vendor_infoframe_config(hdmi))
		DRM_ERROR("Unable to configure VS infoframe\n");

	/* Sw reset */
	hdmi_swreset(hdmi);
}

static void sti_hdmi_set_mode(struct drm_bridge *bridge,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	struct sti_hdmi *hdmi = bridge->driver_private;
	int ret;

	DRM_DEBUG_DRIVER("\n");

	/* Copy the drm display mode in the connector local structure */
	memcpy(&hdmi->mode, mode, sizeof(struct drm_display_mode));

	/* Update clock framerate according to the selected mode */
	ret = clk_set_rate(hdmi->clk_pix, mode->clock * 1000);
	if (ret < 0) {
		DRM_ERROR("Cannot set rate (%dHz) for hdmi_pix clk\n",
			  mode->clock * 1000);
		return;
	}
	ret = clk_set_rate(hdmi->clk_phy, mode->clock * 1000);
	if (ret < 0) {
		DRM_ERROR("Cannot set rate (%dHz) for hdmi_rejection_pll clk\n",
			  mode->clock * 1000);
		return;
	}
}

static void sti_hdmi_bridge_nope(struct drm_bridge *bridge)
{
	/* do nothing */
}

static const struct drm_bridge_funcs sti_hdmi_bridge_funcs = {
	.pre_enable = sti_hdmi_pre_enable,
	.enable = sti_hdmi_bridge_nope,
	.disable = sti_hdmi_disable,
	.post_disable = sti_hdmi_bridge_nope,
	.mode_set = sti_hdmi_set_mode,
};

static int sti_hdmi_connector_get_modes(struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;
	struct edid *edid;
	int count;

	DRM_DEBUG_DRIVER("\n");

	edid = drm_get_edid(connector, hdmi->ddc_adapt);
	if (!edid)
		goto fail;

	count = drm_add_edid_modes(connector, edid);
	drm_mode_connector_update_edid_property(connector, edid);
	drm_edid_to_eld(connector, edid);

	kfree(edid);
	return count;

fail:
	DRM_ERROR("Can't read HDMI EDID\n");
	return 0;
}

#define CLK_TOLERANCE_HZ 50

static int sti_hdmi_connector_mode_valid(struct drm_connector *connector,
					struct drm_display_mode *mode)
{
	int target = mode->clock * 1000;
	int target_min = target - CLK_TOLERANCE_HZ;
	int target_max = target + CLK_TOLERANCE_HZ;
	int result;
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;


	result = clk_round_rate(hdmi->clk_pix, target);

	DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n",
			 target, result);

	if ((result < target_min) || (result > target_max)) {
		DRM_DEBUG_DRIVER("hdmi pixclk=%d not supported\n", target);
		return MODE_BAD;
	}

	return MODE_OK;
}

static const
struct drm_connector_helper_funcs sti_hdmi_connector_helper_funcs = {
	.get_modes = sti_hdmi_connector_get_modes,
	.mode_valid = sti_hdmi_connector_mode_valid,
};

/* get detection status of display device */
static enum drm_connector_status
sti_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;

	DRM_DEBUG_DRIVER("\n");

	if (hdmi->hpd) {
		DRM_DEBUG_DRIVER("hdmi cable connected\n");
		return connector_status_connected;
	}

	DRM_DEBUG_DRIVER("hdmi cable disconnected\n");
	return connector_status_disconnected;
}

static void sti_hdmi_connector_init_property(struct drm_device *drm_dev,
					     struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;
	struct drm_property *prop;

	/* colorspace property */
	hdmi->colorspace = DEFAULT_COLORSPACE_MODE;
	prop = drm_property_create_enum(drm_dev, 0, "colorspace",
					colorspace_mode_names,
					ARRAY_SIZE(colorspace_mode_names));
	if (!prop) {
		DRM_ERROR("fails to create colorspace property\n");
		return;
	}
	hdmi_connector->colorspace_property = prop;
	drm_object_attach_property(&connector->base, prop, hdmi->colorspace);

	/* hdmi_mode property */
	hdmi->hdmi_mode = DEFAULT_HDMI_MODE;
	prop = drm_property_create_enum(drm_dev, 0, "hdmi_mode",
					hdmi_mode_names,
					ARRAY_SIZE(hdmi_mode_names));
	if (!prop) {
		DRM_ERROR("fails to create colorspace property\n");
		return;
	}
	hdmi_connector->hdmi_mode_property = prop;
	drm_object_attach_property(&connector->base, prop, hdmi->hdmi_mode);

}

static int
sti_hdmi_connector_set_property(struct drm_connector *connector,
				struct drm_connector_state *state,
				struct drm_property *property,
				uint64_t val)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;

	if (property == hdmi_connector->colorspace_property) {
		hdmi->colorspace = val;
		return 0;
	}

	if (property == hdmi_connector->hdmi_mode_property) {
		hdmi->hdmi_mode = val;
		return 0;
	}

	DRM_ERROR("failed to set hdmi connector property\n");
	return -EINVAL;
}

static int
sti_hdmi_connector_get_property(struct drm_connector *connector,
				const struct drm_connector_state *state,
				struct drm_property *property,
				uint64_t *val)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;

	if (property == hdmi_connector->colorspace_property) {
		*val = hdmi->colorspace;
		return 0;
	}

	if (property == hdmi_connector->hdmi_mode_property) {
		*val = hdmi->hdmi_mode;
		return 0;
	}

	DRM_ERROR("failed to get hdmi connector property\n");
	return -EINVAL;
}

static int sti_hdmi_late_register(struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;

	if (hdmi_debugfs_init(hdmi, hdmi->drm_dev->primary)) {
		DRM_ERROR("HDMI debugfs setup failed\n");
		return -EINVAL;
	}

	return 0;
}

static const struct drm_connector_funcs sti_hdmi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = sti_hdmi_connector_detect,
	.destroy = drm_connector_cleanup,
	.reset = drm_atomic_helper_connector_reset,
	.set_property = drm_atomic_helper_connector_set_property,
	.atomic_set_property = sti_hdmi_connector_set_property,
	.atomic_get_property = sti_hdmi_connector_get_property,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	.late_register = sti_hdmi_late_register,
};

static struct drm_encoder *sti_hdmi_find_encoder(struct drm_device *dev)
{
	struct drm_encoder *encoder;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_TMDS)
			return encoder;
	}

	return NULL;
}

static void hdmi_audio_shutdown(struct device *dev, void *data)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
	int audio_cfg;

	DRM_DEBUG_DRIVER("\n");

	/* disable audio */
	audio_cfg = HDMI_AUD_CFG_SPDIF_DIV_2 | HDMI_AUD_CFG_DTS_INVALID |
		    HDMI_AUD_CFG_ONE_BIT_INVALID;
	hdmi_write(hdmi, audio_cfg, HDMI_AUDIO_CFG);

	hdmi->audio.enabled = false;
	hdmi_audio_infoframe_config(hdmi);
}

static int hdmi_audio_hw_params(struct device *dev,
				void *data,
				struct hdmi_codec_daifmt *daifmt,
				struct hdmi_codec_params *params)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
	int ret;

	DRM_DEBUG_DRIVER("\n");

	if ((daifmt->fmt != HDMI_I2S) || daifmt->bit_clk_inv ||
	    daifmt->frame_clk_inv || daifmt->bit_clk_master ||
	    daifmt->frame_clk_master) {
		dev_err(dev, "%s: Bad flags %d %d %d %d\n", __func__,
			daifmt->bit_clk_inv, daifmt->frame_clk_inv,
			daifmt->bit_clk_master,
			daifmt->frame_clk_master);
		return -EINVAL;
	}

	hdmi->audio.sample_width = params->sample_width;
	hdmi->audio.sample_rate = params->sample_rate;
	hdmi->audio.cea = params->cea;

	hdmi->audio.enabled = true;

	ret = hdmi_audio_configure(hdmi);
	if (ret < 0)
		return ret;

	return 0;
}

static int hdmi_audio_digital_mute(struct device *dev, void *data, bool enable)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);

	DRM_DEBUG_DRIVER("%s\n", enable ? "enable" : "disable");

	if (enable)
		hdmi_write(hdmi, HDMI_SAMPLE_FLAT_ALL, HDMI_SAMPLE_FLAT_MASK);
	else
		hdmi_write(hdmi, HDMI_SAMPLE_FLAT_NO, HDMI_SAMPLE_FLAT_MASK);

	return 0;
}

static int hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf, size_t len)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
	struct drm_connector *connector = hdmi->drm_connector;

	DRM_DEBUG_DRIVER("\n");
	memcpy(buf, connector->eld, min(sizeof(connector->eld), len));

	return 0;
}

static const struct hdmi_codec_ops audio_codec_ops = {
	.hw_params = hdmi_audio_hw_params,
	.audio_shutdown = hdmi_audio_shutdown,
	.digital_mute = hdmi_audio_digital_mute,
	.get_eld = hdmi_audio_get_eld,
};

static int sti_hdmi_register_audio_driver(struct device *dev,
					  struct sti_hdmi *hdmi)
{
	struct hdmi_codec_pdata codec_data = {
		.ops = &audio_codec_ops,
		.max_i2s_channels = 8,
		.i2s = 1,
	};

	DRM_DEBUG_DRIVER("\n");

	hdmi->audio.enabled = false;

	hdmi->audio_pdev = platform_device_register_data(
		dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
		&codec_data, sizeof(codec_data));

	if (IS_ERR(hdmi->audio_pdev))
		return PTR_ERR(hdmi->audio_pdev);

	DRM_INFO("%s Driver bound %s\n", HDMI_CODEC_DRV_NAME, dev_name(dev));

	return 0;
}

static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;
	struct drm_encoder *encoder;
	struct sti_hdmi_connector *connector;
	struct drm_connector *drm_connector;
	struct drm_bridge *bridge;
	int err;

	/* Set the drm device handle */
	hdmi->drm_dev = drm_dev;

	encoder = sti_hdmi_find_encoder(drm_dev);
	if (!encoder)
		return -EINVAL;

	connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
	if (!connector)
		return -EINVAL;

	connector->hdmi = hdmi;

	bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
	if (!bridge)
		return -EINVAL;

	bridge->driver_private = hdmi;
	bridge->funcs = &sti_hdmi_bridge_funcs;
	drm_bridge_attach(encoder, bridge, NULL);

	connector->encoder = encoder;

	drm_connector = (struct drm_connector *)connector;

	drm_connector->polled = DRM_CONNECTOR_POLL_HPD;

	drm_connector_init(drm_dev, drm_connector,
			&sti_hdmi_connector_funcs, DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(drm_connector,
			&sti_hdmi_connector_helper_funcs);

	/* initialise property */
	sti_hdmi_connector_init_property(drm_dev, drm_connector);

	hdmi->drm_connector = drm_connector;

	err = drm_mode_connector_attach_encoder(drm_connector, encoder);
	if (err) {
		DRM_ERROR("Failed to attach a connector to a encoder\n");
		goto err_sysfs;
	}

	err = sti_hdmi_register_audio_driver(dev, hdmi);
	if (err) {
		DRM_ERROR("Failed to attach an audio codec\n");
		goto err_sysfs;
	}

	/* Initialize audio infoframe */
	err = hdmi_audio_infoframe_init(&hdmi->audio.cea);
	if (err) {
		DRM_ERROR("Failed to init audio infoframe\n");
		goto err_sysfs;
	}

	/* Enable default interrupts */
	hdmi_write(hdmi, HDMI_DEFAULT_INT, HDMI_INT_EN);

	return 0;

err_sysfs:
	drm_bridge_remove(bridge);
	hdmi->drm_connector = NULL;
	return -EINVAL;
}

static void sti_hdmi_unbind(struct device *dev,
		struct device *master, void *data)
{
}

static const struct component_ops sti_hdmi_ops = {
	.bind = sti_hdmi_bind,
	.unbind = sti_hdmi_unbind,
};

static const struct of_device_id hdmi_of_match[] = {
	{
		.compatible = "st,stih407-hdmi",
		.data = &tx3g4c28phy_ops,
	}, {
		/* end node */
	}
};
MODULE_DEVICE_TABLE(of, hdmi_of_match);

static int sti_hdmi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sti_hdmi *hdmi;
	struct device_node *np = dev->of_node;
	struct resource *res;
	struct device_node *ddc;
	int ret;

	DRM_INFO("%s\n", __func__);

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

	ddc = of_parse_phandle(pdev->dev.of_node, "ddc", 0);
	if (ddc) {
		hdmi->ddc_adapt = of_get_i2c_adapter_by_node(ddc);
		of_node_put(ddc);
		if (!hdmi->ddc_adapt)
			return -EPROBE_DEFER;
	}

	hdmi->dev = pdev->dev;

	/* Get resources */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hdmi-reg");
	if (!res) {
		DRM_ERROR("Invalid hdmi resource\n");
		ret = -ENOMEM;
		goto release_adapter;
	}
	hdmi->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
	if (!hdmi->regs) {
		ret = -ENOMEM;
		goto release_adapter;
	}

	hdmi->phy_ops = (struct hdmi_phy_ops *)
		of_match_node(hdmi_of_match, np)->data;

	/* Get clock resources */
	hdmi->clk_pix = devm_clk_get(dev, "pix");
	if (IS_ERR(hdmi->clk_pix)) {
		DRM_ERROR("Cannot get hdmi_pix clock\n");
		ret = PTR_ERR(hdmi->clk_pix);
		goto release_adapter;
	}

	hdmi->clk_tmds = devm_clk_get(dev, "tmds");
	if (IS_ERR(hdmi->clk_tmds)) {
		DRM_ERROR("Cannot get hdmi_tmds clock\n");
		ret = PTR_ERR(hdmi->clk_tmds);
		goto release_adapter;
	}

	hdmi->clk_phy = devm_clk_get(dev, "phy");
	if (IS_ERR(hdmi->clk_phy)) {
		DRM_ERROR("Cannot get hdmi_phy clock\n");
		ret = PTR_ERR(hdmi->clk_phy);
		goto release_adapter;
	}

	hdmi->clk_audio = devm_clk_get(dev, "audio");
	if (IS_ERR(hdmi->clk_audio)) {
		DRM_ERROR("Cannot get hdmi_audio clock\n");
		ret = PTR_ERR(hdmi->clk_audio);
		goto release_adapter;
	}

	hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;

	init_waitqueue_head(&hdmi->wait_event);

	hdmi->irq = platform_get_irq_byname(pdev, "irq");

	ret = devm_request_threaded_irq(dev, hdmi->irq, hdmi_irq,
			hdmi_irq_thread, IRQF_ONESHOT, dev_name(dev), hdmi);
	if (ret) {
		DRM_ERROR("Failed to register HDMI interrupt\n");
		goto release_adapter;
	}

	hdmi->reset = devm_reset_control_get(dev, "hdmi");
	/* Take hdmi out of reset */
	if (!IS_ERR(hdmi->reset))
		reset_control_deassert(hdmi->reset);

	platform_set_drvdata(pdev, hdmi);

	return component_add(&pdev->dev, &sti_hdmi_ops);

 release_adapter:
	i2c_put_adapter(hdmi->ddc_adapt);

	return ret;
}

static int sti_hdmi_remove(struct platform_device *pdev)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(&pdev->dev);

	i2c_put_adapter(hdmi->ddc_adapt);
	if (hdmi->audio_pdev)
		platform_device_unregister(hdmi->audio_pdev);
	component_del(&pdev->dev, &sti_hdmi_ops);

	return 0;
}

struct platform_driver sti_hdmi_driver = {
	.driver = {
		.name = "sti-hdmi",
		.owner = THIS_MODULE,
		.of_match_table = hdmi_of_match,
	},
	.probe = sti_hdmi_probe,
	.remove = sti_hdmi_remove,
};

MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");