summaryrefslogtreecommitdiff
path: root/drivers/media/platform/davinci/vpif_display.c
blob: 56fe4e5b396e1a068ba601deeabe02af053e678c (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
/*
 * vpif-display - VPIF display driver
 * Display driver for TI DaVinci VPIF
 *
 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
 * Copyright (C) 2014 Lad, Prabhakar <prabhakar.csengg@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <media/v4l2-ioctl.h>

#include "vpif.h"
#include "vpif_display.h"

MODULE_DESCRIPTION("TI DaVinci VPIF Display driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(VPIF_DISPLAY_VERSION);

#define VPIF_V4L2_STD (V4L2_STD_525_60 | V4L2_STD_625_50)

#define vpif_err(fmt, arg...)	v4l2_err(&vpif_obj.v4l2_dev, fmt, ## arg)
#define vpif_dbg(level, debug, fmt, arg...)	\
		v4l2_dbg(level, debug, &vpif_obj.v4l2_dev, fmt, ## arg)

static int debug = 1;

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "Debug level 0-1");

#define VPIF_DRIVER_NAME	"vpif_display"
MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);

/* Is set to 1 in case of SDTV formats, 2 in case of HDTV formats. */
static int ycmux_mode;

static u8 channel_first_int[VPIF_NUMOBJECTS][2] = { {1, 1} };

static struct vpif_device vpif_obj = { {NULL} };
static struct device *vpif_dev;
static void vpif_calculate_offsets(struct channel_obj *ch);
static void vpif_config_addr(struct channel_obj *ch, int muxmode);

static inline
struct vpif_disp_buffer *to_vpif_buffer(struct vb2_v4l2_buffer *vb)
{
	return container_of(vb, struct vpif_disp_buffer, vb);
}

/**
 * vpif_buffer_prepare :  callback function for buffer prepare
 * @vb: ptr to vb2_buffer
 *
 * This is the callback function for buffer prepare when vb2_qbuf()
 * function is called. The buffer is prepared and user space virtual address
 * or user address is converted into  physical address
 */
static int vpif_buffer_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
	struct common_obj *common;

	common = &ch->common[VPIF_VIDEO_INDEX];

	vb2_set_plane_payload(vb, 0, common->fmt.fmt.pix.sizeimage);
	if (vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
		return -EINVAL;

	vbuf->field = common->fmt.fmt.pix.field;

	if (vb->vb2_queue->type != V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
		unsigned long addr = vb2_dma_contig_plane_dma_addr(vb, 0);

		if (!ISALIGNED(addr + common->ytop_off) ||
			!ISALIGNED(addr + common->ybtm_off) ||
			!ISALIGNED(addr + common->ctop_off) ||
			!ISALIGNED(addr + common->cbtm_off)) {
			vpif_err("buffer offset not aligned to 8 bytes\n");
			return -EINVAL;
		}
	}

	return 0;
}

/**
 * vpif_buffer_queue_setup : Callback function for buffer setup.
 * @vq: vb2_queue ptr
 * @nbuffers: ptr to number of buffers requested by application
 * @nplanes:: contains number of distinct video planes needed to hold a frame
 * @sizes[]: contains the size (in bytes) of each plane.
 * @alloc_devs: ptr to allocation context
 *
 * This callback function is called when reqbuf() is called to adjust
 * the buffer count and buffer size
 */
static int vpif_buffer_queue_setup(struct vb2_queue *vq,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], struct device *alloc_devs[])
{
	struct channel_obj *ch = vb2_get_drv_priv(vq);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	unsigned size = common->fmt.fmt.pix.sizeimage;

	if (*nplanes) {
		if (sizes[0] < size)
			return -EINVAL;
		size = sizes[0];
	}

	if (vq->num_buffers + *nbuffers < 3)
		*nbuffers = 3 - vq->num_buffers;

	*nplanes = 1;
	sizes[0] = size;

	/* Calculate the offset for Y and C data  in the buffer */
	vpif_calculate_offsets(ch);

	return 0;
}

/**
 * vpif_buffer_queue : Callback function to add buffer to DMA queue
 * @vb: ptr to vb2_buffer
 *
 * This callback fucntion queues the buffer to DMA engine
 */
static void vpif_buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vpif_disp_buffer *buf = to_vpif_buffer(vbuf);
	struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
	struct common_obj *common;
	unsigned long flags;

	common = &ch->common[VPIF_VIDEO_INDEX];

	/* add the buffer to the DMA queue */
	spin_lock_irqsave(&common->irqlock, flags);
	list_add_tail(&buf->list, &common->dma_queue);
	spin_unlock_irqrestore(&common->irqlock, flags);
}

/**
 * vpif_start_streaming : Starts the DMA engine for streaming
 * @vb: ptr to vb2_buffer
 * @count: number of buffers
 */
static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct vpif_display_config *vpif_config_data =
					vpif_dev->platform_data;
	struct channel_obj *ch = vb2_get_drv_priv(vq);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct vpif_params *vpif = &ch->vpifparams;
	struct vpif_disp_buffer *buf, *tmp;
	unsigned long addr, flags;
	int ret;

	spin_lock_irqsave(&common->irqlock, flags);

	/* Initialize field_id */
	ch->field_id = 0;

	/* clock settings */
	if (vpif_config_data->set_clock) {
		ret = vpif_config_data->set_clock(ch->vpifparams.std_info.
		ycmux_mode, ch->vpifparams.std_info.hd_sd);
		if (ret < 0) {
			vpif_err("can't set clock\n");
			goto err;
		}
	}

	/* set the parameters and addresses */
	ret = vpif_set_video_params(vpif, ch->channel_id + 2);
	if (ret < 0)
		goto err;

	ycmux_mode = ret;
	vpif_config_addr(ch, ret);
	/* Get the next frame from the buffer queue */
	common->next_frm = common->cur_frm =
			    list_entry(common->dma_queue.next,
				       struct vpif_disp_buffer, list);

	list_del(&common->cur_frm->list);
	spin_unlock_irqrestore(&common->irqlock, flags);

	addr = vb2_dma_contig_plane_dma_addr(&common->cur_frm->vb.vb2_buf, 0);
	common->set_addr((addr + common->ytop_off),
			    (addr + common->ybtm_off),
			    (addr + common->ctop_off),
			    (addr + common->cbtm_off));

	/*
	 * Set interrupt for both the fields in VPIF
	 * Register enable channel in VPIF register
	 */
	channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
	if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
		channel2_intr_assert();
		channel2_intr_enable(1);
		enable_channel2(1);
		if (vpif_config_data->chan_config[VPIF_CHANNEL2_VIDEO].clip_en)
			channel2_clipping_enable(1);
	}

	if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
		channel3_intr_assert();
		channel3_intr_enable(1);
		enable_channel3(1);
		if (vpif_config_data->chan_config[VPIF_CHANNEL3_VIDEO].clip_en)
			channel3_clipping_enable(1);
	}

	return 0;

err:
	list_for_each_entry_safe(buf, tmp, &common->dma_queue, list) {
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
	}
	spin_unlock_irqrestore(&common->irqlock, flags);

	return ret;
}

/**
 * vpif_stop_streaming : Stop the DMA engine
 * @vq: ptr to vb2_queue
 *
 * This callback stops the DMA engine and any remaining buffers
 * in the DMA queue are released.
 */
static void vpif_stop_streaming(struct vb2_queue *vq)
{
	struct channel_obj *ch = vb2_get_drv_priv(vq);
	struct common_obj *common;
	unsigned long flags;

	common = &ch->common[VPIF_VIDEO_INDEX];

	/* Disable channel */
	if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
		enable_channel2(0);
		channel2_intr_enable(0);
	}
	if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
		enable_channel3(0);
		channel3_intr_enable(0);
	}

	/* release all active buffers */
	spin_lock_irqsave(&common->irqlock, flags);
	if (common->cur_frm == common->next_frm) {
		vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
				VB2_BUF_STATE_ERROR);
	} else {
		if (common->cur_frm)
			vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
					VB2_BUF_STATE_ERROR);
		if (common->next_frm)
			vb2_buffer_done(&common->next_frm->vb.vb2_buf,
					VB2_BUF_STATE_ERROR);
	}

	while (!list_empty(&common->dma_queue)) {
		common->next_frm = list_entry(common->dma_queue.next,
						struct vpif_disp_buffer, list);
		list_del(&common->next_frm->list);
		vb2_buffer_done(&common->next_frm->vb.vb2_buf,
				VB2_BUF_STATE_ERROR);
	}
	spin_unlock_irqrestore(&common->irqlock, flags);
}

static const struct vb2_ops video_qops = {
	.queue_setup		= vpif_buffer_queue_setup,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
	.buf_prepare		= vpif_buffer_prepare,
	.start_streaming	= vpif_start_streaming,
	.stop_streaming		= vpif_stop_streaming,
	.buf_queue		= vpif_buffer_queue,
};

static void process_progressive_mode(struct common_obj *common)
{
	unsigned long addr;

	spin_lock(&common->irqlock);
	/* Get the next buffer from buffer queue */
	common->next_frm = list_entry(common->dma_queue.next,
				struct vpif_disp_buffer, list);
	/* Remove that buffer from the buffer queue */
	list_del(&common->next_frm->list);
	spin_unlock(&common->irqlock);

	/* Set top and bottom field addrs in VPIF registers */
	addr = vb2_dma_contig_plane_dma_addr(&common->next_frm->vb.vb2_buf, 0);
	common->set_addr(addr + common->ytop_off,
				 addr + common->ybtm_off,
				 addr + common->ctop_off,
				 addr + common->cbtm_off);
}

static void process_interlaced_mode(int fid, struct common_obj *common)
{
	/* device field id and local field id are in sync */
	/* If this is even field */
	if (0 == fid) {
		if (common->cur_frm == common->next_frm)
			return;

		/* one frame is displayed If next frame is
		 *  available, release cur_frm and move on */
		/* Copy frame display time */
		common->cur_frm->vb.vb2_buf.timestamp = ktime_get_ns();
		/* Change status of the cur_frm */
		vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
					VB2_BUF_STATE_DONE);
		/* Make cur_frm pointing to next_frm */
		common->cur_frm = common->next_frm;

	} else if (1 == fid) {	/* odd field */
		spin_lock(&common->irqlock);
		if (list_empty(&common->dma_queue)
		    || (common->cur_frm != common->next_frm)) {
			spin_unlock(&common->irqlock);
			return;
		}
		spin_unlock(&common->irqlock);
		/* one field is displayed configure the next
		 * frame if it is available else hold on current
		 * frame */
		/* Get next from the buffer queue */
		process_progressive_mode(common);
	}
}

/*
 * vpif_channel_isr: It changes status of the displayed buffer, takes next
 * buffer from the queue and sets its address in VPIF registers
 */
static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
{
	struct vpif_device *dev = &vpif_obj;
	struct channel_obj *ch;
	struct common_obj *common;
	int fid = -1, i;
	int channel_id;

	channel_id = *(int *)(dev_id);
	if (!vpif_intr_status(channel_id + 2))
		return IRQ_NONE;

	ch = dev->dev[channel_id];
	for (i = 0; i < VPIF_NUMOBJECTS; i++) {
		common = &ch->common[i];
		/* If streaming is started in this channel */

		if (1 == ch->vpifparams.std_info.frm_fmt) {
			spin_lock(&common->irqlock);
			if (list_empty(&common->dma_queue)) {
				spin_unlock(&common->irqlock);
				continue;
			}
			spin_unlock(&common->irqlock);

			/* Progressive mode */
			if (!channel_first_int[i][channel_id]) {
				/* Mark status of the cur_frm to
				 * done and unlock semaphore on it */
				common->cur_frm->vb.vb2_buf.timestamp =
						ktime_get_ns();
				vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
						VB2_BUF_STATE_DONE);
				/* Make cur_frm pointing to next_frm */
				common->cur_frm = common->next_frm;
			}

			channel_first_int[i][channel_id] = 0;
			process_progressive_mode(common);
		} else {
			/* Interlaced mode */
			/* If it is first interrupt, ignore it */

			if (channel_first_int[i][channel_id]) {
				channel_first_int[i][channel_id] = 0;
				continue;
			}

			if (0 == i) {
				ch->field_id ^= 1;
				/* Get field id from VPIF registers */
				fid = vpif_channel_getfid(ch->channel_id + 2);
				/* If fid does not match with stored field id */
				if (fid != ch->field_id) {
					/* Make them in sync */
					if (0 == fid)
						ch->field_id = fid;

					return IRQ_HANDLED;
				}
			}
			process_interlaced_mode(fid, common);
		}
	}

	return IRQ_HANDLED;
}

static int vpif_update_std_info(struct channel_obj *ch)
{
	struct video_obj *vid_ch = &ch->video;
	struct vpif_params *vpifparams = &ch->vpifparams;
	struct vpif_channel_config_params *std_info = &vpifparams->std_info;
	const struct vpif_channel_config_params *config;

	int i;

	for (i = 0; i < vpif_ch_params_count; i++) {
		config = &vpif_ch_params[i];
		if (config->hd_sd == 0) {
			vpif_dbg(2, debug, "SD format\n");
			if (config->stdid & vid_ch->stdid) {
				memcpy(std_info, config, sizeof(*config));
				break;
			}
		}
	}

	if (i == vpif_ch_params_count) {
		vpif_dbg(1, debug, "Format not found\n");
		return -EINVAL;
	}

	return 0;
}

static int vpif_update_resolution(struct channel_obj *ch)
{
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct video_obj *vid_ch = &ch->video;
	struct vpif_params *vpifparams = &ch->vpifparams;
	struct vpif_channel_config_params *std_info = &vpifparams->std_info;

	if (!vid_ch->stdid && !vid_ch->dv_timings.bt.height)
		return -EINVAL;

	if (vid_ch->stdid) {
		if (vpif_update_std_info(ch))
			return -EINVAL;
	}

	common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
	common->fmt.fmt.pix.width = std_info->width;
	common->fmt.fmt.pix.height = std_info->height;
	vpif_dbg(1, debug, "Pixel details: Width = %d,Height = %d\n",
			common->fmt.fmt.pix.width, common->fmt.fmt.pix.height);

	/* Set height and width paramateres */
	common->height = std_info->height;
	common->width = std_info->width;
	common->fmt.fmt.pix.sizeimage = common->height * common->width * 2;

	if (vid_ch->stdid)
		common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
	else
		common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_REC709;

	if (ch->vpifparams.std_info.frm_fmt)
		common->fmt.fmt.pix.field = V4L2_FIELD_NONE;
	else
		common->fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;

	return 0;
}

/*
 * vpif_calculate_offsets: This function calculates buffers offset for Y and C
 * in the top and bottom field
 */
static void vpif_calculate_offsets(struct channel_obj *ch)
{
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct vpif_params *vpifparams = &ch->vpifparams;
	enum v4l2_field field = common->fmt.fmt.pix.field;
	struct video_obj *vid_ch = &ch->video;
	unsigned int hpitch, sizeimage;

	if (V4L2_FIELD_ANY == common->fmt.fmt.pix.field) {
		if (ch->vpifparams.std_info.frm_fmt)
			vid_ch->buf_field = V4L2_FIELD_NONE;
		else
			vid_ch->buf_field = V4L2_FIELD_INTERLACED;
	} else {
		vid_ch->buf_field = common->fmt.fmt.pix.field;
	}

	sizeimage = common->fmt.fmt.pix.sizeimage;

	hpitch = common->fmt.fmt.pix.bytesperline;
	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
		common->ytop_off = 0;
		common->ybtm_off = hpitch;
		common->ctop_off = sizeimage / 2;
		common->cbtm_off = sizeimage / 2 + hpitch;
	} else if (V4L2_FIELD_SEQ_TB == vid_ch->buf_field) {
		common->ytop_off = 0;
		common->ybtm_off = sizeimage / 4;
		common->ctop_off = sizeimage / 2;
		common->cbtm_off = common->ctop_off + sizeimage / 4;
	} else if (V4L2_FIELD_SEQ_BT == vid_ch->buf_field) {
		common->ybtm_off = 0;
		common->ytop_off = sizeimage / 4;
		common->cbtm_off = sizeimage / 2;
		common->ctop_off = common->cbtm_off + sizeimage / 4;
	}

	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
		vpifparams->video_params.storage_mode = 1;
	} else {
		vpifparams->video_params.storage_mode = 0;
	}

	if (ch->vpifparams.std_info.frm_fmt == 1) {
		vpifparams->video_params.hpitch =
		    common->fmt.fmt.pix.bytesperline;
	} else {
		if ((field == V4L2_FIELD_ANY) ||
			(field == V4L2_FIELD_INTERLACED))
			vpifparams->video_params.hpitch =
			    common->fmt.fmt.pix.bytesperline * 2;
		else
			vpifparams->video_params.hpitch =
			    common->fmt.fmt.pix.bytesperline;
	}

	ch->vpifparams.video_params.stdid = ch->vpifparams.std_info.stdid;
}

static void vpif_config_addr(struct channel_obj *ch, int muxmode)
{
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

	if (VPIF_CHANNEL3_VIDEO == ch->channel_id) {
		common->set_addr = ch3_set_videobuf_addr;
	} else {
		if (2 == muxmode)
			common->set_addr = ch2_set_videobuf_addr_yc_nmux;
		else
			common->set_addr = ch2_set_videobuf_addr;
	}
}

/* functions implementing ioctls */
/**
 * vpif_querycap() - QUERYCAP handler
 * @file: file ptr
 * @priv: file handle
 * @cap: ptr to v4l2_capability structure
 */
static int vpif_querycap(struct file *file, void  *priv,
				struct v4l2_capability *cap)
{
	struct vpif_display_config *config = vpif_dev->platform_data;

	cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	strlcpy(cap->driver, VPIF_DRIVER_NAME, sizeof(cap->driver));
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
		 dev_name(vpif_dev));
	strlcpy(cap->card, config->card_name, sizeof(cap->card));

	return 0;
}

static int vpif_enum_fmt_vid_out(struct file *file, void  *priv,
					struct v4l2_fmtdesc *fmt)
{
	if (fmt->index != 0)
		return -EINVAL;

	/* Fill in the information about format */
	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
	fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
	fmt->flags = 0;
	return 0;
}

static int vpif_g_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

	/* Check the validity of the buffer type */
	if (common->fmt.type != fmt->type)
		return -EINVAL;

	if (vpif_update_resolution(ch))
		return -EINVAL;
	*fmt = common->fmt;
	return 0;
}

static int vpif_try_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;

	/*
	 * to supress v4l-compliance warnings silently correct
	 * the pixelformat
	 */
	if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
		pixfmt->pixelformat = common->fmt.fmt.pix.pixelformat;

	if (vpif_update_resolution(ch))
		return -EINVAL;

	pixfmt->colorspace = common->fmt.fmt.pix.colorspace;
	pixfmt->field = common->fmt.fmt.pix.field;
	pixfmt->bytesperline = common->fmt.fmt.pix.width;
	pixfmt->width = common->fmt.fmt.pix.width;
	pixfmt->height = common->fmt.fmt.pix.height;
	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height * 2;

	return 0;
}

static int vpif_s_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
	int ret;

	if (vb2_is_busy(&common->buffer_queue))
		return -EBUSY;

	ret = vpif_try_fmt_vid_out(file, priv, fmt);
	if (ret)
		return ret;

	/* store the pix format in the channel object */
	common->fmt.fmt.pix = *pixfmt;

	/* store the format in the channel object */
	common->fmt = *fmt;
	return 0;
}

static int vpif_s_std(struct file *file, void *priv, v4l2_std_id std_id)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct vpif_display_chan_config *chan_cfg;
	struct v4l2_output output;
	int ret;

	if (!config->chan_config[ch->channel_id].outputs)
		return -ENODATA;

	chan_cfg = &config->chan_config[ch->channel_id];
	output = chan_cfg->outputs[ch->output_idx].output;
	if (output.capabilities != V4L2_OUT_CAP_STD)
		return -ENODATA;

	if (vb2_is_busy(&common->buffer_queue))
		return -EBUSY;


	if (!(std_id & VPIF_V4L2_STD))
		return -EINVAL;

	/* Call encoder subdevice function to set the standard */
	ch->video.stdid = std_id;
	memset(&ch->video.dv_timings, 0, sizeof(ch->video.dv_timings));
	/* Get the information about the standard */
	if (vpif_update_resolution(ch))
		return -EINVAL;

	common->fmt.fmt.pix.bytesperline = common->fmt.fmt.pix.width;

	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
						s_std_output, std_id);
	if (ret < 0) {
		vpif_err("Failed to set output standard\n");
		return ret;
	}

	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
							s_std, std_id);
	if (ret < 0)
		vpif_err("Failed to set standard for sub devices\n");
	return ret;
}

static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_display_chan_config *chan_cfg;
	struct v4l2_output output;

	if (!config->chan_config[ch->channel_id].outputs)
		return -ENODATA;

	chan_cfg = &config->chan_config[ch->channel_id];
	output = chan_cfg->outputs[ch->output_idx].output;
	if (output.capabilities != V4L2_OUT_CAP_STD)
		return -ENODATA;

	*std = ch->video.stdid;
	return 0;
}

static int vpif_enum_output(struct file *file, void *fh,
				struct v4l2_output *output)
{

	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_display_chan_config *chan_cfg;

	chan_cfg = &config->chan_config[ch->channel_id];
	if (output->index >= chan_cfg->output_count) {
		vpif_dbg(1, debug, "Invalid output index\n");
		return -EINVAL;
	}

	*output = chan_cfg->outputs[output->index].output;
	return 0;
}

/**
 * vpif_output_to_subdev() - Maps output to sub device
 * @vpif_cfg - global config ptr
 * @chan_cfg - channel config ptr
 * @index - Given output index from application
 *
 * lookup the sub device information for a given output index.
 * we report all the output to application. output table also
 * has sub device name for the each output
 */
static int
vpif_output_to_subdev(struct vpif_display_config *vpif_cfg,
		      struct vpif_display_chan_config *chan_cfg, int index)
{
	struct vpif_subdev_info *subdev_info;
	const char *subdev_name;
	int i;

	vpif_dbg(2, debug, "vpif_output_to_subdev\n");

	if (!chan_cfg->outputs)
		return -1;

	subdev_name = chan_cfg->outputs[index].subdev_name;
	if (!subdev_name)
		return -1;

	/* loop through the sub device list to get the sub device info */
	for (i = 0; i < vpif_cfg->subdev_count; i++) {
		subdev_info = &vpif_cfg->subdevinfo[i];
		if (!strcmp(subdev_info->name, subdev_name))
			return i;
	}
	return -1;
}

/**
 * vpif_set_output() - Select an output
 * @vpif_cfg - global config ptr
 * @ch - channel
 * @index - Given output index from application
 *
 * Select the given output.
 */
static int vpif_set_output(struct vpif_display_config *vpif_cfg,
		      struct channel_obj *ch, int index)
{
	struct vpif_display_chan_config *chan_cfg =
		&vpif_cfg->chan_config[ch->channel_id];
	struct v4l2_subdev *sd = NULL;
	u32 input = 0, output = 0;
	int sd_index;
	int ret;

	sd_index = vpif_output_to_subdev(vpif_cfg, chan_cfg, index);
	if (sd_index >= 0)
		sd = vpif_obj.sd[sd_index];

	if (sd) {
		input = chan_cfg->outputs[index].input_route;
		output = chan_cfg->outputs[index].output_route;
		ret = v4l2_subdev_call(sd, video, s_routing, input, output, 0);
		if (ret < 0 && ret != -ENOIOCTLCMD) {
			vpif_err("Failed to set output\n");
			return ret;
		}

	}
	ch->output_idx = index;
	ch->sd = sd;
	if (chan_cfg->outputs)
		/* update tvnorms from the sub device output info */
		ch->video_dev.tvnorms = chan_cfg->outputs[index].output.std;
	return 0;
}

static int vpif_s_output(struct file *file, void *priv, unsigned int i)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_display_chan_config *chan_cfg;
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

	if (vb2_is_busy(&common->buffer_queue))
		return -EBUSY;

	chan_cfg = &config->chan_config[ch->channel_id];

	if (i >= chan_cfg->output_count)
		return -EINVAL;

	return vpif_set_output(config, ch, i);
}

static int vpif_g_output(struct file *file, void *priv, unsigned int *i)
{
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);

	*i = ch->output_idx;

	return 0;
}

/**
 * vpif_enum_dv_timings() - ENUM_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: input timings
 */
static int
vpif_enum_dv_timings(struct file *file, void *priv,
		     struct v4l2_enum_dv_timings *timings)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_display_chan_config *chan_cfg;
	struct v4l2_output output;
	int ret;

	if (!config->chan_config[ch->channel_id].outputs)
		return -ENODATA;

	chan_cfg = &config->chan_config[ch->channel_id];
	output = chan_cfg->outputs[ch->output_idx].output;
	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
		return -ENODATA;

	timings->pad = 0;

	ret = v4l2_subdev_call(ch->sd, pad, enum_dv_timings, timings);
	if (ret == -ENOIOCTLCMD || ret == -ENODEV)
		return -EINVAL;
	return ret;
}

/**
 * vpif_s_dv_timings() - S_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: digital video timings
 */
static int vpif_s_dv_timings(struct file *file, void *priv,
		struct v4l2_dv_timings *timings)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_params *vpifparams = &ch->vpifparams;
	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
	struct vpif_channel_config_params *std_info = &vpifparams->std_info;
	struct video_obj *vid_ch = &ch->video;
	struct v4l2_bt_timings *bt = &vid_ch->dv_timings.bt;
	struct vpif_display_chan_config *chan_cfg;
	struct v4l2_output output;
	int ret;

	if (!config->chan_config[ch->channel_id].outputs)
		return -ENODATA;

	chan_cfg = &config->chan_config[ch->channel_id];
	output = chan_cfg->outputs[ch->output_idx].output;
	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
		return -ENODATA;

	if (vb2_is_busy(&common->buffer_queue))
		return -EBUSY;

	if (timings->type != V4L2_DV_BT_656_1120) {
		vpif_dbg(2, debug, "Timing type not defined\n");
		return -EINVAL;
	}

	/* Configure subdevice timings, if any */
	ret = v4l2_subdev_call(ch->sd, video, s_dv_timings, timings);
	if (ret == -ENOIOCTLCMD || ret == -ENODEV)
		ret = 0;
	if (ret < 0) {
		vpif_dbg(2, debug, "Error setting custom DV timings\n");
		return ret;
	}

	if (!(timings->bt.width && timings->bt.height &&
				(timings->bt.hbackporch ||
				 timings->bt.hfrontporch ||
				 timings->bt.hsync) &&
				timings->bt.vfrontporch &&
				(timings->bt.vbackporch ||
				 timings->bt.vsync))) {
		vpif_dbg(2, debug, "Timings for width, height, horizontal back porch, horizontal sync, horizontal front porch, vertical back porch, vertical sync and vertical back porch must be defined\n");
		return -EINVAL;
	}

	vid_ch->dv_timings = *timings;

	/* Configure video port timings */

	std_info->eav2sav = V4L2_DV_BT_BLANKING_WIDTH(bt) - 8;
	std_info->sav2eav = bt->width;

	std_info->l1 = 1;
	std_info->l3 = bt->vsync + bt->vbackporch + 1;

	std_info->vsize = V4L2_DV_BT_FRAME_HEIGHT(bt);
	if (bt->interlaced) {
		if (bt->il_vbackporch || bt->il_vfrontporch || bt->il_vsync) {
			std_info->l5 = std_info->vsize/2 -
				(bt->vfrontporch - 1);
			std_info->l7 = std_info->vsize/2 + 1;
			std_info->l9 = std_info->l7 + bt->il_vsync +
				bt->il_vbackporch + 1;
			std_info->l11 = std_info->vsize -
				(bt->il_vfrontporch - 1);
		} else {
			vpif_dbg(2, debug, "Required timing values for interlaced BT format missing\n");
			return -EINVAL;
		}
	} else {
		std_info->l5 = std_info->vsize - (bt->vfrontporch - 1);
	}
	strncpy(std_info->name, "Custom timings BT656/1120",
			VPIF_MAX_NAME);
	std_info->width = bt->width;
	std_info->height = bt->height;
	std_info->frm_fmt = bt->interlaced ? 0 : 1;
	std_info->ycmux_mode = 0;
	std_info->capture_format = 0;
	std_info->vbi_supported = 0;
	std_info->hd_sd = 1;
	std_info->stdid = 0;
	vid_ch->stdid = 0;

	return 0;
}

/**
 * vpif_g_dv_timings() - G_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: digital video timings
 */
static int vpif_g_dv_timings(struct file *file, void *priv,
		struct v4l2_dv_timings *timings)
{
	struct vpif_display_config *config = vpif_dev->platform_data;
	struct video_device *vdev = video_devdata(file);
	struct channel_obj *ch = video_get_drvdata(vdev);
	struct vpif_display_chan_config *chan_cfg;
	struct video_obj *vid_ch = &ch->video;
	struct v4l2_output output;

	if (!config->chan_config[ch->channel_id].outputs)
		goto error;

	chan_cfg = &config->chan_config[ch->channel_id];
	output = chan_cfg->outputs[ch->output_idx].output;

	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
		goto error;

	*timings = vid_ch->dv_timings;

	return 0;
error:
	return -ENODATA;
}

/*
 * vpif_log_status() - Status information
 * @file: file ptr
 * @priv: file handle
 *
 * Returns zero.
 */
static int vpif_log_status(struct file *filep, void *priv)
{
	/* status for sub devices */
	v4l2_device_call_all(&vpif_obj.v4l2_dev, 0, core, log_status);

	return 0;
}

/* vpif display ioctl operations */
static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
	.vidioc_querycap		= vpif_querycap,
	.vidioc_enum_fmt_vid_out	= vpif_enum_fmt_vid_out,
	.vidioc_g_fmt_vid_out		= vpif_g_fmt_vid_out,
	.vidioc_s_fmt_vid_out		= vpif_s_fmt_vid_out,
	.vidioc_try_fmt_vid_out		= vpif_try_fmt_vid_out,

	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_expbuf			= vb2_ioctl_expbuf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,

	.vidioc_s_std			= vpif_s_std,
	.vidioc_g_std			= vpif_g_std,

	.vidioc_enum_output		= vpif_enum_output,
	.vidioc_s_output		= vpif_s_output,
	.vidioc_g_output		= vpif_g_output,

	.vidioc_enum_dv_timings		= vpif_enum_dv_timings,
	.vidioc_s_dv_timings		= vpif_s_dv_timings,
	.vidioc_g_dv_timings		= vpif_g_dv_timings,

	.vidioc_log_status		= vpif_log_status,
};

static const struct v4l2_file_operations vpif_fops = {
	.owner		= THIS_MODULE,
	.open		= v4l2_fh_open,
	.release	= vb2_fop_release,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= vb2_fop_mmap,
	.poll		= vb2_fop_poll
};

/*Configure the channels, buffer sizei, request irq */
static int initialize_vpif(void)
{
	int free_channel_objects_index;
	int err, i, j;

	/* Allocate memory for six channel objects */
	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
		vpif_obj.dev[i] =
		    kzalloc(sizeof(struct channel_obj), GFP_KERNEL);
		/* If memory allocation fails, return error */
		if (!vpif_obj.dev[i]) {
			free_channel_objects_index = i;
			err = -ENOMEM;
			goto vpif_init_free_channel_objects;
		}
	}

	return 0;

vpif_init_free_channel_objects:
	for (j = 0; j < free_channel_objects_index; j++)
		kfree(vpif_obj.dev[j]);
	return err;
}

static int vpif_async_bound(struct v4l2_async_notifier *notifier,
			    struct v4l2_subdev *subdev,
			    struct v4l2_async_subdev *asd)
{
	int i;

	for (i = 0; i < vpif_obj.config->subdev_count; i++)
		if (!strcmp(vpif_obj.config->subdevinfo[i].name,
			    subdev->name)) {
			vpif_obj.sd[i] = subdev;
			vpif_obj.sd[i]->grp_id = 1 << i;
			return 0;
		}

	return -EINVAL;
}

static int vpif_probe_complete(void)
{
	struct common_obj *common;
	struct video_device *vdev;
	struct channel_obj *ch;
	struct vb2_queue *q;
	int j, err, k;

	for (j = 0; j < VPIF_DISPLAY_MAX_DEVICES; j++) {
		ch = vpif_obj.dev[j];
		/* Initialize field of the channel objects */
		for (k = 0; k < VPIF_NUMOBJECTS; k++) {
			common = &ch->common[k];
			spin_lock_init(&common->irqlock);
			mutex_init(&common->lock);
			common->set_addr = NULL;
			common->ytop_off = 0;
			common->ybtm_off = 0;
			common->ctop_off = 0;
			common->cbtm_off = 0;
			common->cur_frm = NULL;
			common->next_frm = NULL;
			memset(&common->fmt, 0, sizeof(common->fmt));
		}
		ch->initialized = 0;
		if (vpif_obj.config->subdev_count)
			ch->sd = vpif_obj.sd[0];
		ch->channel_id = j;

		memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));

		ch->common[VPIF_VIDEO_INDEX].fmt.type =
						V4L2_BUF_TYPE_VIDEO_OUTPUT;

		/* select output 0 */
		err = vpif_set_output(vpif_obj.config, ch, 0);
		if (err)
			goto probe_out;

		/* set initial format */
		ch->video.stdid = V4L2_STD_525_60;
		memset(&ch->video.dv_timings, 0, sizeof(ch->video.dv_timings));
		vpif_update_resolution(ch);

		/* Initialize vb2 queue */
		q = &common->buffer_queue;
		q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
		q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
		q->drv_priv = ch;
		q->ops = &video_qops;
		q->mem_ops = &vb2_dma_contig_memops;
		q->buf_struct_size = sizeof(struct vpif_disp_buffer);
		q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
		q->min_buffers_needed = 1;
		q->lock = &common->lock;
		q->dev = vpif_dev;
		err = vb2_queue_init(q);
		if (err) {
			vpif_err("vpif_display: vb2_queue_init() failed\n");
			goto probe_out;
		}

		INIT_LIST_HEAD(&common->dma_queue);

		/* register video device */
		vpif_dbg(1, debug, "channel=%p,channel->video_dev=%p\n",
			 ch, &ch->video_dev);

		/* Initialize the video_device structure */
		vdev = &ch->video_dev;
		strlcpy(vdev->name, VPIF_DRIVER_NAME, sizeof(vdev->name));
		vdev->release = video_device_release_empty;
		vdev->fops = &vpif_fops;
		vdev->ioctl_ops = &vpif_ioctl_ops;
		vdev->v4l2_dev = &vpif_obj.v4l2_dev;
		vdev->vfl_dir = VFL_DIR_TX;
		vdev->queue = q;
		vdev->lock = &common->lock;
		video_set_drvdata(&ch->video_dev, ch);
		err = video_register_device(vdev, VFL_TYPE_GRABBER,
					    (j ? 3 : 2));
		if (err < 0)
			goto probe_out;
	}

	return 0;

probe_out:
	for (k = 0; k < j; k++) {
		ch = vpif_obj.dev[k];
		common = &ch->common[k];
		video_unregister_device(&ch->video_dev);
	}
	return err;
}

static int vpif_async_complete(struct v4l2_async_notifier *notifier)
{
	return vpif_probe_complete();
}

/*
 * vpif_probe: This function creates device entries by register itself to the
 * V4L2 driver and initializes fields of each channel objects
 */
static __init int vpif_probe(struct platform_device *pdev)
{
	struct vpif_subdev_info *subdevdata;
	struct i2c_adapter *i2c_adap;
	struct resource *res;
	int subdev_count;
	int res_idx = 0;
	int i, err;

	if (!pdev->dev.platform_data) {
		dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
		return -EINVAL;
	}

	if (!pdev->dev.platform_data) {
		dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
		return -EINVAL;
	}

	vpif_dev = &pdev->dev;
	err = initialize_vpif();

	if (err) {
		v4l2_err(vpif_dev->driver, "Error initializing vpif\n");
		return err;
	}

	err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
	if (err) {
		v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
		return err;
	}

	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
					IRQF_SHARED, VPIF_DRIVER_NAME,
					(void *)(&vpif_obj.dev[res_idx]->
					channel_id));
		if (err) {
			err = -EINVAL;
			vpif_err("VPIF IRQ request failed\n");
			goto vpif_unregister;
		}
		res_idx++;
	}

	vpif_obj.config = pdev->dev.platform_data;
	subdev_count = vpif_obj.config->subdev_count;
	subdevdata = vpif_obj.config->subdevinfo;
	vpif_obj.sd = kcalloc(subdev_count, sizeof(*vpif_obj.sd), GFP_KERNEL);
	if (!vpif_obj.sd) {
		err = -ENOMEM;
		goto vpif_unregister;
	}

	if (!vpif_obj.config->asd_sizes) {
		i2c_adap = i2c_get_adapter(vpif_obj.config->i2c_adapter_id);
		for (i = 0; i < subdev_count; i++) {
			vpif_obj.sd[i] =
				v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
							  i2c_adap,
							  &subdevdata[i].
							  board_info,
							  NULL);
			if (!vpif_obj.sd[i]) {
				vpif_err("Error registering v4l2 subdevice\n");
				err = -ENODEV;
				goto probe_subdev_out;
			}

			if (vpif_obj.sd[i])
				vpif_obj.sd[i]->grp_id = 1 << i;
		}
		vpif_probe_complete();
	} else {
		vpif_obj.notifier.subdevs = vpif_obj.config->asd;
		vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
		vpif_obj.notifier.bound = vpif_async_bound;
		vpif_obj.notifier.complete = vpif_async_complete;
		err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
						   &vpif_obj.notifier);
		if (err) {
			vpif_err("Error registering async notifier\n");
			err = -EINVAL;
			goto probe_subdev_out;
		}
	}

	return 0;

probe_subdev_out:
	kfree(vpif_obj.sd);
vpif_unregister:
	v4l2_device_unregister(&vpif_obj.v4l2_dev);

	return err;
}

/*
 * vpif_remove: It un-register channels from V4L2 driver
 */
static int vpif_remove(struct platform_device *device)
{
	struct channel_obj *ch;
	int i;

	v4l2_device_unregister(&vpif_obj.v4l2_dev);

	kfree(vpif_obj.sd);
	/* un-register device */
	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
		/* Get the pointer to the channel object */
		ch = vpif_obj.dev[i];
		/* Unregister video device */
		video_unregister_device(&ch->video_dev);
		kfree(vpif_obj.dev[i]);
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int vpif_suspend(struct device *dev)
{
	struct common_obj *common;
	struct channel_obj *ch;
	int i;

	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
		/* Get the pointer to the channel object */
		ch = vpif_obj.dev[i];
		common = &ch->common[VPIF_VIDEO_INDEX];

		if (!vb2_start_streaming_called(&common->buffer_queue))
			continue;

		mutex_lock(&common->lock);
		/* Disable channel */
		if (ch->channel_id == VPIF_CHANNEL2_VIDEO) {
			enable_channel2(0);
			channel2_intr_enable(0);
		}
		if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
			ycmux_mode == 2) {
			enable_channel3(0);
			channel3_intr_enable(0);
		}
		mutex_unlock(&common->lock);
	}

	return 0;
}

static int vpif_resume(struct device *dev)
{

	struct common_obj *common;
	struct channel_obj *ch;
	int i;

	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
		/* Get the pointer to the channel object */
		ch = vpif_obj.dev[i];
		common = &ch->common[VPIF_VIDEO_INDEX];

		if (!vb2_start_streaming_called(&common->buffer_queue))
			continue;

		mutex_lock(&common->lock);
		/* Enable channel */
		if (ch->channel_id == VPIF_CHANNEL2_VIDEO) {
			enable_channel2(1);
			channel2_intr_enable(1);
		}
		if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
				ycmux_mode == 2) {
			enable_channel3(1);
			channel3_intr_enable(1);
		}
		mutex_unlock(&common->lock);
	}

	return 0;
}

#endif

static SIMPLE_DEV_PM_OPS(vpif_pm_ops, vpif_suspend, vpif_resume);

static __refdata struct platform_driver vpif_driver = {
	.driver	= {
			.name	= VPIF_DRIVER_NAME,
			.pm	= &vpif_pm_ops,
	},
	.probe	= vpif_probe,
	.remove	= vpif_remove,
};

module_platform_driver(vpif_driver);