summaryrefslogtreecommitdiffstats
path: root/gralloc_drm_kms.c
blob: 6bd4add133d9338e1ab062b66fb7ad9a42808785 (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
/*
 * Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
 * Copyright (C) 2010-2011 LunarG Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#define LOG_TAG "GRALLOC-KMS"

#include <cutils/properties.h>
#include <cutils/log.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <poll.h>
#include <math.h>
#include "gralloc_drm.h"
#include "gralloc_drm_priv.h"
#include <hardware_legacy/uevent.h>

#include <drm_fourcc.h>

struct uevent {
	const char *action;
	const char *path;
	const char *subsystem;
	const char *device_name;
	int major;
	int minor;
	int hotplug;
	int switchstate;
};

static void parse_event(const char *msg, struct uevent *uevent)
{
	uevent->action = "";
	uevent->path = "";
	uevent->subsystem = "";
	uevent->major = -1;
	uevent->minor = -1;
	uevent->device_name = "";
	uevent->hotplug = 0;
	uevent->switchstate = -1;

	while (*msg) {
		if (!strncmp(msg, "ACTION=", 7)) {
			msg += 7;
			uevent->action = msg;
		} else if (!strncmp(msg, "DEVPATH=", 8)) {
			msg += 8;
			uevent->path = msg;
		} else if (!strncmp(msg, "SUBSYSTEM=", 10)) {
			msg += 10;
			uevent->subsystem = msg;
		} else if (!strncmp(msg, "MAJOR=", 6)) {
			msg += 6;
			uevent->major = atoi(msg);
		} else if (!strncmp(msg, "MINOR=", 6)) {
			msg += 6;
			uevent->minor = atoi(msg);
		} else if (!strncmp(msg, "DEVNAME=", 8)) {
			msg += 8;
			uevent->device_name = msg;
		} else if (!strncmp(msg, "HOTPLUG=1", 9)) {
			msg += 9;
			uevent->hotplug = 1;
		} else if (!strncmp(msg, "SWITCH_STATE=", 13)) {
			msg += 13;
			uevent->switchstate = atoi(msg);
		}

		/* advance to after the next \0 */
		while (*msg++)
			;
	}
}

/*
 * Return true if a bo needs fb.
 */
int gralloc_drm_bo_need_fb(const struct gralloc_drm_bo_t *bo)
{
	return ((bo->handle->usage & GRALLOC_USAGE_HW_FB) &&
		bo->drm->swap_mode != DRM_SWAP_COPY);
}

static unsigned int drm_format_from_hal(int hal_format)
{
	switch(hal_format) {
		case HAL_PIXEL_FORMAT_RGB_888:
		case HAL_PIXEL_FORMAT_BGRA_8888:
			return DRM_FORMAT_XRGB8888;
		case HAL_PIXEL_FORMAT_RGBX_8888:
			return DRM_FORMAT_XBGR8888;
		case HAL_PIXEL_FORMAT_RGBA_8888:
			return DRM_FORMAT_RGBA8888;
		case HAL_PIXEL_FORMAT_RGB_565:
			return DRM_FORMAT_RGB565;
		case HAL_PIXEL_FORMAT_YV12:
			return DRM_FORMAT_YUV420;
		case HAL_PIXEL_FORMAT_DRM_NV12:
			return DRM_FORMAT_NV12;
		default:
			return 0;
	}
}

/*
 * Modify pitches, offsets and handles according to
 * the format and return corresponding drm format value
 */
static int resolve_drm_format(struct gralloc_drm_bo_t *bo,
	uint32_t *pitches, uint32_t *offsets, uint32_t *handles)
{
	struct gralloc_drm_t *drm = bo->drm;

	pitches[0] = bo->handle->stride;
	handles[0] = bo->fb_handle;

	/* driver takes care of HW specific padding, alignment etc. */
	if (drm->drv->resolve_format)
		drm->drv->resolve_format(drm->drv, bo,
			pitches, offsets, handles);

	return drm_format_from_hal(bo->handle->format);
}

/*
 * Returns planes that are supported for a particular format
 */
unsigned int planes_for_format(struct gralloc_drm_t *drm,
	int hal_format)
{
	unsigned int i, j, mask = 0;
	unsigned int drm_format = drm_format_from_hal(hal_format);
	struct gralloc_drm_plane_t *plane = drm->planes;

	/* no planes available */
	if (!plane)
		return 0;

	/* iterate through planes, mark those that match format */
	for (i=0; i<drm->plane_resources->count_planes; i++, plane++)
		for (j=0; j<plane->drm_plane->count_formats; j++)
			if (plane->drm_plane->formats[j] == drm_format)
				mask |= (1U << plane->drm_plane->plane_id);

	return mask;
}

/*
 * Add a fb object for a bo.
 */
int gralloc_drm_bo_add_fb(struct gralloc_drm_bo_t *bo)
{
	uint32_t pitches[4] = { 0, 0, 0, 0 };
	uint32_t offsets[4] = { 0, 0, 0, 0 };
	uint32_t handles[4] = { 0, 0, 0, 0 };

	if (bo->fb_id)
		return 0;

	int drm_format = resolve_drm_format(bo, pitches, offsets, handles);

	if (drm_format == 0) {
		ALOGE("error resolving drm format");
		return -EINVAL;
	}

	return drmModeAddFB2(bo->drm->fd,
		bo->handle->width, bo->handle->height,
		drm_format, handles, pitches, offsets,
		(uint32_t *) &bo->fb_id, 0);
}

/*
 * Remove a fb object for a bo.
 */
void gralloc_drm_bo_rm_fb(struct gralloc_drm_bo_t *bo)
{
	if (bo->fb_id) {
		drmModeRmFB(bo->drm->fd, bo->fb_id);
		bo->fb_id = 0;
	}
}

/*
 * Program CRTC.
 */
static int drm_kms_set_crtc(struct gralloc_drm_t *drm,
	struct gralloc_drm_output *output, int fb_id)
{
	int ret;

	ret = drmModeSetCrtc(drm->fd, output->crtc_id, fb_id,
			0, 0, &output->connector_id, 1, &output->mode);
	if (ret) {
		ALOGE("failed to set crtc (%s) (crtc_id %d, fb_id %d, conn %d, mode %dx%d)",
			strerror(errno), output->crtc_id, fb_id, output->connector_id,
			output->mode.hdisplay, output->mode.vdisplay);
		return ret;
	}

	if (drm->mode_quirk_vmwgfx)
		ret = drmModeDirtyFB(drm->fd, fb_id, &drm->clip, 1);

	return ret;
}

/*
 * Callback for a page flip event.
 */
static void page_flip_handler(int fd, unsigned int sequence,
		unsigned int tv_sec, unsigned int tv_usec,
		void *user_data)
{
	struct gralloc_drm_t *drm = (struct gralloc_drm_t *) user_data;

	/* ack the last scheduled flip */
	drm->current_front = drm->next_front;
	drm->next_front = NULL;
}

/*
 * Set a plane.
 */
static int gralloc_drm_bo_setplane(struct gralloc_drm_t *drm,
	struct gralloc_drm_plane_t *plane)
{
	struct gralloc_drm_bo_t *bo = NULL;
	int err;

	if (plane->handle)
		bo = gralloc_drm_bo_from_handle(plane->handle);

	// create a framebuffer if does not exist
	if (bo && bo->fb_id == 0) {
		err = gralloc_drm_bo_add_fb(bo);
		if (err) {
			ALOGE("%s: could not create drm fb, (%s)",
				__func__, strerror(-err));
			return err;
		}
	}

	err = drmModeSetPlane(drm->fd,
		plane->drm_plane->plane_id,
		drm->primary.crtc_id,
		bo ? bo->fb_id : 0,
		0, // flags
		plane->dst_x,
		plane->dst_y,
		plane->dst_w,
		plane->dst_h,
		plane->src_x << 16,
		plane->src_y << 16,
		plane->src_w << 16,
		plane->src_h << 16);

	if (err) {
		/* clear plane_mask so that this buffer won't be tried again */
		struct gralloc_drm_handle_t *drm_handle =
			(struct gralloc_drm_handle_t *) plane->handle;
		drm_handle->plane_mask = 0;

		ALOGE("drmModeSetPlane : error (%s) (plane %d crtc %d fb %d)",
			strerror(-err),
			plane->drm_plane->plane_id,
			drm->primary.crtc_id,
			bo ? bo->fb_id : 0);
	}

	if (plane->prev)
		gralloc_drm_bo_decref(plane->prev);

	if (bo)
		bo->refcount++;

	plane->prev = bo;

	return err;
}

/*
 * Returns if a particular plane is supported with the implementation
 */
static unsigned is_plane_supported(const struct gralloc_drm_t *drm,
	const struct gralloc_drm_plane_t *plane)
{
	/* Planes are only supported on primary pipe for now */
	return plane->drm_plane->possible_crtcs & (1 << drm->primary.pipe);
}

/*
 * Sets all the active planes to be displayed.
 */
static void gralloc_drm_set_planes(struct gralloc_drm_t *drm)
{
	struct gralloc_drm_plane_t *plane = drm->planes;
	unsigned int i;
	for (i = 0; i < drm->plane_resources->count_planes;
		i++, plane++) {
		/* plane is not in use at all */
		if (!plane->active && !plane->handle)
			continue;

		/* plane is active, safety check if it is supported */
		if (!is_plane_supported(drm, plane))
			ALOGE("%s: plane %d is not supported",
				 __func__, plane->drm_plane->plane_id);

		/*
		 * Disable overlay if it is not active
		 * or if there is error during setplane
		 */
		if (!plane->active)
			plane->handle = 0;

		if (gralloc_drm_bo_setplane(drm, plane))
			plane->active = 0;
	}
}

/*
 * Interface for HWC, used to reserve a plane for a layer.
 */
int gralloc_drm_reserve_plane(struct gralloc_drm_t *drm,
	buffer_handle_t handle,
	uint32_t id,
	uint32_t dst_x,
	uint32_t dst_y,
	uint32_t dst_w,
	uint32_t dst_h,
	uint32_t src_x,
	uint32_t src_y,
	uint32_t src_w,
	uint32_t src_h)
{
	int j;
	struct gralloc_drm_handle_t *drm_handle =
		gralloc_drm_handle(handle);
	int plane_count = drm->plane_resources->count_planes;
	struct gralloc_drm_plane_t *plane = drm->planes;

	/* no supported planes for this handle */
	if (!drm_handle->plane_mask) {
		ALOGE("%s: buffer %p cannot be shown on a plane\n",
			__func__, drm_handle);
		return -EINVAL;
	}

	for (j = 0; j < plane_count; j++, plane++) {

		/*
		 * handle may be suitable to be shown on a plane, in
		 * addition we need to check that this particular plane
		 * is supported by the current implementation
		 */
		if (!is_plane_supported(drm, plane))
			continue;

		/* if plane is available and can support this buffer */
		if (!plane->active &&
			drm_handle->plane_mask &
			(1U << plane->drm_plane->plane_id)) {

			plane->dst_x = dst_x;
			plane->dst_y = dst_y;
			plane->dst_w = dst_w;
			plane->dst_h = dst_h;
			plane->src_x = src_x;
			plane->src_y = src_y;
			plane->src_w = src_w;
			plane->src_h = src_h;
			plane->handle = handle;
			plane->id = id;
			plane->active = 1;

			return 0;
		}
	}

	/* no free planes available */
	return -EBUSY;
}

/*
 * Interface for HWC, used to disable all the overlays. Plane id
 * is also set to 0 as it should be mappable to a particular layer only
 * if it has been reserved with 'reserve_plane'.
 */
void gralloc_drm_disable_planes(struct gralloc_drm_t *drm)
{
	struct gralloc_drm_plane_t *plane = drm->planes;
	unsigned int i;

	for (i = 0; i < drm->plane_resources->count_planes; i++, plane++) {
		plane->active = 0;
		plane->id = 0;
	}
}

/*
 * Interface for HWC, used to change handle of a reserved plane.
 */
int gralloc_drm_set_plane_handle(struct gralloc_drm_t *drm,
	uint32_t id, buffer_handle_t handle)
{
	struct gralloc_drm_plane_t *plane = drm->planes;
	unsigned i;

	for (i = 0; i < drm->plane_resources->count_planes; i++, plane++)
		if (plane->active && plane->id == id) {
			plane->handle = handle;
			return 0;
		}

	return -EINVAL;
}

static int drm_kms_blit_to_hdmi(struct gralloc_drm_t *drm, struct gralloc_drm_bo_t *bo)
{
	int ret = 0;
	if (drm->hdmi.active && drm->hdmi_mode == HDMI_CLONED && drm->hdmi.bo) {

		int dst_x1 = 0, dst_y1 = 0;

		if (drm->hdmi.bo->handle->width > bo->handle->width)
			dst_x1 = (drm->hdmi.bo->handle->width - bo->handle->width) / 2;
		if (drm->hdmi.bo->handle->height > bo->handle->height)
			dst_y1 = (drm->hdmi.bo->handle->height - bo->handle->height) / 2;

		drm->drv->blit(drm->drv, drm->hdmi.bo, bo,
				dst_x1, dst_y1,
				dst_x1 + bo->handle->width,
				dst_y1 + bo->handle->height,
				0, 0, bo->handle->width, bo->handle->height);

		ret = drmModePageFlip(drm->fd, drm->hdmi.crtc_id, drm->hdmi.bo->fb_id, 0, NULL);
		if (ret && errno != EBUSY)
			ALOGE("failed to perform page flip for hdmi (%s) (crtc %d fb %d))",
					strerror(errno), drm->hdmi.crtc_id, drm->hdmi.bo->fb_id);
	}

	return ret;
}

/*
 * Schedule a page flip.
 */
static int drm_kms_page_flip(struct gralloc_drm_t *drm,
		struct gralloc_drm_bo_t *bo)
{
	int ret;

	/* there is another flip pending */
	while (drm->next_front) {
		drm->waiting_flip = 1;
		drmHandleEvent(drm->fd, &drm->evctx);
		drm->waiting_flip = 0;
		if (drm->next_front) {
			/* record an error and break */
			ALOGE("drmHandleEvent returned without flipping");
			drm->current_front = drm->next_front;
			drm->next_front = NULL;
		}
	}

	if (!bo)
		return 0;

	pthread_mutex_lock(&drm->hdmi_mutex);
	drm_kms_blit_to_hdmi(drm, bo);
	pthread_mutex_unlock(&drm->hdmi_mutex);

	/* set planes to be displayed */
	gralloc_drm_set_planes(drm);

	ret = drmModePageFlip(drm->fd, drm->primary.crtc_id, bo->fb_id,
			DRM_MODE_PAGE_FLIP_EVENT, (void *) drm);
	if (ret) {
		ALOGE("failed to perform page flip for primary (%s) (crtc %d fb %d))",
			strerror(errno), drm->primary.crtc_id, bo->fb_id);
		/* try to set mode for next frame */
		if (errno != EBUSY)
			drm->first_post = 1;
	}
	else
		drm->next_front = bo;

	return ret;
}

/*
 * Wait for the next post.
 */
static void drm_kms_wait_for_post(struct gralloc_drm_t *drm, int flip)
{
	unsigned int current, target;
	drmVBlank vbl;
	int ret;

	if (drm->mode_quirk_vmwgfx)
		return;

	flip = !!flip;

	memset(&vbl, 0, sizeof(vbl));
	vbl.request.type = DRM_VBLANK_RELATIVE;
	if (drm->vblank_secondary)
		vbl.request.type |= DRM_VBLANK_SECONDARY;
	vbl.request.sequence = 0;

	/* get the current vblank */
	ret = drmWaitVBlank(drm->fd, &vbl);
	if (ret) {
		ALOGW("failed to get vblank");
		return;
	}

	current = vbl.reply.sequence;
	if (drm->first_post)
		target = current;
	else
		target = drm->last_swap + drm->swap_interval - flip;

	/* wait for vblank */
	if (current < target || !flip) {
		memset(&vbl, 0, sizeof(vbl));
		vbl.request.type = DRM_VBLANK_ABSOLUTE;
		if (drm->vblank_secondary)
			vbl.request.type |= DRM_VBLANK_SECONDARY;
		if (!flip) {
			vbl.request.type |= DRM_VBLANK_NEXTONMISS;
			if (target < current)
				target = current;
		}

		vbl.request.sequence = target;

		ret = drmWaitVBlank(drm->fd, &vbl);
		if (ret) {
			ALOGW("failed to wait vblank");
			return;
		}
	}

	drm->last_swap = vbl.reply.sequence + flip;
}

/*
 * Post a bo.  This is not thread-safe.
 */
int gralloc_drm_bo_post(struct gralloc_drm_bo_t *bo)
{
	struct gralloc_drm_t *drm = bo->drm;
	int ret;

	if (!bo->fb_id && drm->swap_mode != DRM_SWAP_COPY) {
		ALOGE("unable to post bo %p without fb", bo);
		return -EINVAL;
	}

	/* TODO spawn a thread to avoid waiting and race */

	if (drm->first_post) {
		if (drm->swap_mode == DRM_SWAP_COPY) {
			struct gralloc_drm_bo_t *dst;

			dst = (drm->next_front) ?
				drm->next_front :
				drm->current_front;
			drm->drv->blit(drm->drv, dst, bo, 0, 0,
					bo->handle->width,
					bo->handle->height,
					0, 0,
					bo->handle->width,
					bo->handle->height);
			bo = dst;
		}

		ret = drm_kms_set_crtc(drm, &drm->primary, bo->fb_id);
		if (!ret) {
			drm->first_post = 0;
			drm->current_front = bo;
			if (drm->next_front == bo)
				drm->next_front = NULL;
		}

		pthread_mutex_lock(&drm->hdmi_mutex);
		if (drm->hdmi.active && drm->hdmi_mode == HDMI_CLONED && drm->hdmi.bo)
			drm_kms_set_crtc(drm, &drm->hdmi, drm->hdmi.bo->fb_id);
		pthread_mutex_unlock(&drm->hdmi_mutex);

		return ret;
	}

	switch (drm->swap_mode) {
	case DRM_SWAP_FLIP:
		if (drm->swap_interval > 1)
			drm_kms_wait_for_post(drm, 1);
		ret = drm_kms_page_flip(drm, bo);
		if (drm->next_front) {
			/*
			 * wait if the driver says so or the current front
			 * will be written by CPU
			 */
			if (drm->mode_sync_flip ||
			    (drm->current_front->handle->usage &
			     GRALLOC_USAGE_SW_WRITE_MASK))
				drm_kms_page_flip(drm, NULL);
		}
		break;
	case DRM_SWAP_COPY:
		drm_kms_wait_for_post(drm, 0);
		drm->drv->blit(drm->drv, drm->current_front,
				bo, 0, 0,
				bo->handle->width,
				bo->handle->height,
				0, 0,
				bo->handle->width,
				bo->handle->height);
		if (drm->mode_quirk_vmwgfx)
			ret = drmModeDirtyFB(drm->fd, drm->current_front->fb_id, &drm->clip, 1);
		ret = 0;
		break;
	case DRM_SWAP_SETCRTC:
		drm_kms_wait_for_post(drm, 0);
		ret = drm_kms_set_crtc(drm, &drm->primary, bo->fb_id);

		pthread_mutex_lock(&drm->hdmi_mutex);
		if (drm->hdmi.active && drm->hdmi_mode == HDMI_CLONED && drm->hdmi.bo)
			drm_kms_set_crtc(drm, &drm->hdmi, drm->hdmi.bo->fb_id);
		pthread_mutex_unlock(&drm->hdmi_mutex);

		drm->current_front = bo;
		break;
	default:
		/* no-op */
		ret = 0;
		break;
	}

	return ret;
}

static struct gralloc_drm_t *drm_singleton;

static void on_signal(int sig)
{
	struct gralloc_drm_t *drm = drm_singleton;

	/* wait the pending flip */
	if (drm && drm->swap_mode == DRM_SWAP_FLIP && drm->next_front) {
		/* there is race, but this function is hacky enough to ignore that */
		if (drm_singleton->waiting_flip)
			usleep(100 * 1000); /* 100ms */
		else
			drm_kms_page_flip(drm_singleton, NULL);
	}

	exit(-1);
}

static void drm_kms_init_features(struct gralloc_drm_t *drm)
{
	const char *swap_mode;

	/* call to the driver here, after KMS has been initialized */
	drm->drv->init_kms_features(drm->drv, drm);

	if (drm->swap_mode == DRM_SWAP_FLIP) {
		struct sigaction act;

		memset(&drm->evctx, 0, sizeof(drm->evctx));
		drm->evctx.version = DRM_EVENT_CONTEXT_VERSION;
		drm->evctx.page_flip_handler = page_flip_handler;

		/*
		 * XXX GPU tends to freeze if the program is terminiated with a
		 * flip pending.  What is the right way to handle the
		 * situation?
		 */
		sigemptyset(&act.sa_mask);
		act.sa_handler = on_signal;
		act.sa_flags = 0;
		sigaction(SIGINT, &act, NULL);
		sigaction(SIGTERM, &act, NULL);

		drm_singleton = drm;
	}
	else if (drm->swap_mode == DRM_SWAP_COPY) {
		struct gralloc_drm_bo_t *front;
		int stride;

		/* create the real front buffer */
		front = gralloc_drm_bo_create(drm,
					      drm->primary.mode.hdisplay,
					      drm->primary.mode.vdisplay,
					      drm->primary.fb_format,
					      GRALLOC_USAGE_HW_FB);
		if (front && gralloc_drm_bo_add_fb(front)) {
			gralloc_drm_bo_decref(front);
			front = NULL;
		}

		/* abuse next_front */
		if (front)
			drm->next_front = front;
		else
			drm->swap_mode = DRM_SWAP_SETCRTC;
	}

	switch (drm->swap_mode) {
	case DRM_SWAP_FLIP:
		swap_mode = "flip";
		break;
	case DRM_SWAP_COPY:
		swap_mode = "copy";
		break;
	case DRM_SWAP_SETCRTC:
		swap_mode = "set-crtc";
		break;
	default:
		swap_mode = "no-op";
		break;
	}

	ALOGD("will use %s for fb posting", swap_mode);
}

#define MARGIN_PERCENT 1.8   /* % of active vertical image*/
#define CELL_GRAN 8.0   /* assumed character cell granularity*/
#define MIN_PORCH 1 /* minimum front porch   */
#define V_SYNC_RQD 3 /* width of vsync in lines   */
#define H_SYNC_PERCENT 8.0   /* width of hsync as % of total line */
#define MIN_VSYNC_PLUS_BP 550.0 /* min time of vsync + back porch (microsec) */
#define M 600.0 /* blanking formula gradient */
#define C 40.0  /* blanking formula offset   */
#define K 128.0 /* blanking formula scaling factor   */
#define J 20.0  /* blanking formula scaling factor   */
/* C' and M' are part of the Blanking Duty Cycle computation */
#define C_PRIME   (((C - J) * K / 256.0) + J)
#define M_PRIME   (K / 256.0 * M)

static drmModeModeInfoPtr generate_mode(int h_pixels, int v_lines, float freq)
{
	float h_pixels_rnd;
	float v_lines_rnd;
	float v_field_rate_rqd;
	float top_margin;
	float bottom_margin;
	float interlace;
	float h_period_est;
	float vsync_plus_bp;
	float v_back_porch;
	float total_v_lines;
	float v_field_rate_est;
	float h_period;
	float v_field_rate;
	float v_frame_rate;
	float left_margin;
	float right_margin;
	float total_active_pixels;
	float ideal_duty_cycle;
	float h_blank;
	float total_pixels;
	float pixel_freq;
	float h_freq;

	float h_sync;
	float h_front_porch;
	float v_odd_front_porch_lines;
	int interlaced = 0;
	int margins = 0;

	drmModeModeInfoPtr m = malloc(sizeof(drmModeModeInfo));

	h_pixels_rnd = rint((float) h_pixels / CELL_GRAN) * CELL_GRAN;
	v_lines_rnd = interlaced ? rint((float) v_lines) / 2.0 : rint((float) v_lines);
	v_field_rate_rqd = interlaced ? (freq * 2.0) : (freq);
	top_margin = margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);
	bottom_margin = margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);
	interlace = interlaced ? 0.5 : 0.0;
	h_period_est = (((1.0 / v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP / 1000000.0)) / (v_lines_rnd + (2 * top_margin) + MIN_PORCH + interlace) * 1000000.0);
	vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP / h_period_est);
	v_back_porch = vsync_plus_bp - V_SYNC_RQD;
	total_v_lines = v_lines_rnd + top_margin + bottom_margin + vsync_plus_bp + interlace + MIN_PORCH;
	v_field_rate_est = 1.0 / h_period_est / total_v_lines * 1000000.0;
	h_period = h_period_est / (v_field_rate_rqd / v_field_rate_est);
	v_field_rate = 1.0 / h_period / total_v_lines * 1000000.0;
	v_frame_rate = interlaced ? v_field_rate / 2.0 : v_field_rate;
	left_margin = margins ? rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN : 0.0;
	right_margin = margins ? rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN : 0.0;
	total_active_pixels = h_pixels_rnd + left_margin + right_margin;
	ideal_duty_cycle = C_PRIME - (M_PRIME * h_period / 1000.0);
	h_blank = rint(total_active_pixels * ideal_duty_cycle / (100.0 - ideal_duty_cycle) / (2.0 * CELL_GRAN)) * (2.0 * CELL_GRAN);
	total_pixels = total_active_pixels + h_blank;
	pixel_freq = total_pixels / h_period;
	h_freq = 1000.0 / h_period;
	h_sync = rint(H_SYNC_PERCENT / 100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;
	h_front_porch = (h_blank / 2.0) - h_sync;
	v_odd_front_porch_lines = MIN_PORCH + interlace;

	m->clock = ceil(pixel_freq) * 1000;
	m->hdisplay = (int) (h_pixels_rnd);
	m->hsync_start = (int) (h_pixels_rnd + h_front_porch);
	m->hsync_end = (int) (h_pixels_rnd + h_front_porch + h_sync);
	m->htotal = (int) (total_pixels);
	m->hskew = 0;
	m->vdisplay = (int) (v_lines_rnd);
	m->vsync_start = (int) (v_lines_rnd + v_odd_front_porch_lines);
	m->vsync_end = (int) (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);
	m->vtotal = (int) (total_v_lines);
	m->vscan = 0;
	m->vrefresh = freq;
	m->flags = 10;
	m->type = 64;

	return (m);
}

static drmModeModeInfoPtr find_mode(drmModeConnectorPtr connector, int *bpp)
{
	char value[PROPERTY_VALUE_MAX];
	drmModeModeInfoPtr mode;
	int dist, i;
	int xres = 0, yres = 0, rate = 0;
	int forcemode = 0;

	if (property_get("debug.drm.mode", value, NULL)) {
		char *p = value, *end;

		/* parse <xres>x<yres>[@<bpp>] */
		if (sscanf(value, "%dx%d@%d", &xres, &yres, bpp) != 3) {
			*bpp = 0;
			if (sscanf(value, "%dx%d", &xres, &yres) != 2)
				xres = yres = 0;
		}

		if ((xres && yres) || *bpp) {
			ALOGI("will find the closest match for %dx%d@%d",
					xres, yres, *bpp);
		}
	} else if (property_get("debug.drm.mode.force", value, NULL)) {
		char *p = value, *end;
		*bpp = 0;

		/* parse <xres>x<yres>[@<refreshrate>] */
		if (sscanf(value, "%dx%d@%d", &xres, &yres, &rate) != 3) {
			rate = 60;
			if (sscanf(value, "%dx%d", &xres, &yres) != 2)
				xres = yres = 0;
		}

		if (xres && yres && rate) {
			ALOGI("will use %dx%d@%dHz", xres, yres, rate);
			forcemode = 1;
		}
	} else {
		*bpp = 0;
	}

	dist = INT_MAX;

	if (forcemode)
		mode = generate_mode(xres, yres, rate);
	else {
		mode = NULL;
		for (i = 0; i < connector->count_modes; i++) {
			drmModeModeInfoPtr m = &connector->modes[i];
			int tmp;

			if (xres && yres) {
				tmp = (m->hdisplay - xres) * (m->hdisplay - xres) +
					(m->vdisplay - yres) * (m->vdisplay - yres);
			}
			else {
				/* use the first preferred mode */
				tmp = (m->type & DRM_MODE_TYPE_PREFERRED) ? 0 : dist;
			}

			if (tmp < dist) {
				mode = m;
				dist = tmp;
				if (!dist)
					break;
			}
		}
	}

	/* fallback to the first mode */
	if (!mode)
		mode = &connector->modes[0];

	ALOGI("Established mode:");
	ALOGI("clock: %d, hdisplay: %d, hsync_start: %d, hsync_end: %d, htotal: %d, hskew: %d", mode->clock, mode->hdisplay, mode->hsync_start, mode->hsync_end, mode->htotal, mode->hskew);
	ALOGI("vdisplay: %d, vsync_start: %d, vsync_end: %d, vtotal: %d, vscan: %d, vrefresh: %d", mode->vdisplay, mode->vsync_start, mode->vsync_end, mode->vtotal, mode->vscan, mode->vrefresh);
	ALOGI("flags: %d, type: %d, name %s", mode->flags, mode->type, mode->name);

	*bpp /= 8;

	return mode;
}

/*
 * Initialize KMS with a connector.
 */
static int drm_kms_init_with_connector(struct gralloc_drm_t *drm,
		struct gralloc_drm_output *output, drmModeConnectorPtr connector)
{
	drmModeEncoderPtr encoder;
	drmModeModeInfoPtr mode;
	static int used_crtcs = 0;
	int bpp, i;

	if (!connector->count_modes)
		return -EINVAL;

	encoder = drmModeGetEncoder(drm->fd, connector->encoders[0]);
	if (!encoder)
		return -EINVAL;

	/* find first possible crtc which is not used yet */
	for (i = 0; i < drm->resources->count_crtcs; i++) {
		if (encoder->possible_crtcs & (1 << i) &&
			(used_crtcs & (1 << i)) != (1 << i))
			break;
	}

	used_crtcs |= (1 << i);

	drmModeFreeEncoder(encoder);
	if (i == drm->resources->count_crtcs)
		return -EINVAL;

	output->bo = NULL;
	output->crtc_id = drm->resources->crtcs[i];
	output->connector_id = connector->connector_id;
	output->pipe = i;

	/* print connector info */
	if (connector->count_modes > 1) {
		ALOGI("there are %d modes on connector 0x%x, type %d",
				connector->count_modes,
				connector->connector_id,
				connector->connector_type);
		for (i = 0; i < connector->count_modes; i++)
			ALOGI("  %s", connector->modes[i].name);
	}
	else {
		ALOGI("there is one mode on connector 0x%d: %s",
				connector->connector_id,
				connector->modes[0].name);
	}

	mode = find_mode(connector, &bpp);

	ALOGI("the best mode is %s", mode->name);

	output->mode = *mode;
	switch (bpp) {
	case 2:
		output->fb_format = HAL_PIXEL_FORMAT_RGB_565;
		break;
	case 4:
	default:
		output->fb_format = HAL_PIXEL_FORMAT_BGRA_8888;
		break;
	}

	if (connector->mmWidth && connector->mmHeight) {
		output->xdpi = (output->mode.hdisplay * 25.4 / connector->mmWidth);
		output->ydpi = (output->mode.vdisplay * 25.4 / connector->mmHeight);
	}
	else {
		output->xdpi = 75;
		output->ydpi = 75;
	}

#ifdef DRM_MODE_FEATURE_DIRTYFB
	drm->clip.x1 = 0;
	drm->clip.y1 = 0;
	drm->clip.x2 = output->mode.hdisplay;
	drm->clip.y2 = output->mode.vdisplay;
#endif

	return 0;
}


/*
 * Fetch a connector of particular type
 */
static drmModeConnectorPtr fetch_connector(struct gralloc_drm_t *drm,
	uint32_t type)
{
	int i;

	if (!drm->resources)
		return NULL;

	for (i = 0; i < drm->resources->count_connectors; i++) {
		drmModeConnectorPtr connector =
			connector = drmModeGetConnector(drm->fd,
				drm->resources->connectors[i]);
		if (connector) {
			if (connector->connector_type == type &&
				connector->connection == DRM_MODE_CONNECTED)
				return connector;
			drmModeFreeConnector(connector);
		}
	}
	return NULL;
}


/*
 * Initializes hdmi output with a connector and allocates
 * a private framebuffer for it. This is called on startup if
 * hdmi cable is connected and also on hotplug events.
 */
static int init_hdmi_output(struct gralloc_drm_t *drm,
	drmModeConnectorPtr connector)
{
	drm_kms_init_with_connector(drm, &drm->hdmi, connector);

	ALOGD("%s, allocate private buffer for hdmi [%dx%d]",
		__func__, drm->hdmi.mode.hdisplay, drm->hdmi.mode.vdisplay);

	drm->hdmi.bo = gralloc_drm_bo_create(drm,
		drm->hdmi.mode.hdisplay, drm->hdmi.mode.vdisplay,
		drm->hdmi.fb_format,
		GRALLOC_USAGE_HW_RENDER);

	int err = gralloc_drm_bo_add_fb(drm->hdmi.bo);
	if (err) {
		ALOGE("%s: could not create drm fb, (%s)",
			__func__, strerror(-err));
		return err;
	}

	drm->hdmi_mode = HDMI_CLONED;
	drm->hdmi.active = 1;

	return 0;
}


/*
 * Thread that listens to uevents and checks if hdmi state changes
 */
static void *hdmi_observer(void *data)
{
	static char uevent_desc[4096];
	drmModeConnectorPtr hdmi;
	struct gralloc_drm_t *drm =
		(struct gralloc_drm_t *) data;
	struct uevent event;

	uevent_init();

	memset(uevent_desc, 0, sizeof(uevent_desc));

	while(1) {

		/* this polls */
		int len = uevent_next_event(uevent_desc, sizeof(uevent_desc) - 2);
		if (!len) continue;

		parse_event(uevent_desc, &event);
		ALOGD_IF(0, "event { '%s', '%s', '%s', %d, %d, %d, %d }\n",
				event.action, event.path, event.subsystem,
				event.major, event.minor,
				event.switchstate, event.hotplug);

		if (!strcmp(event.path, "devices/virtual/switch/hdmi")) {
			if (event.switchstate != -1) {
				pthread_mutex_lock(&drm->hdmi_mutex);

				if (event.switchstate) {
					hdmi = fetch_connector(drm, DRM_MODE_CONNECTOR_HDMIA);
					if (hdmi) {
						ALOGD("init hdmi on switch_state event");
						init_hdmi_output(drm, hdmi);

						/* will trigger modeset */
						drm->first_post = 1;

						drmModeFreeConnector(hdmi);
					}
				} else {
					drm->hdmi.active = 0;

					ALOGD("destroy hdmi private buffer");
					gralloc_drm_bo_decref(drm->hdmi.bo);
					drm->hdmi.bo = NULL;
				}

				pthread_mutex_unlock(&drm->hdmi_mutex);
			}
		} else if (!strcmp(event.subsystem, "drm") &&
				!strcmp(event.device_name, "dri/card0") && event.hotplug) {
			pthread_mutex_lock(&drm->hdmi_mutex);

			hdmi = fetch_connector(drm, DRM_MODE_CONNECTOR_HDMIA);
			if (hdmi && !drm->hdmi.active) {
				ALOGD("init hdmi on hotplug event");
				if (!init_hdmi_output(drm, hdmi)) {
					drm_kms_set_crtc(drm, &drm->hdmi, drm->hdmi.bo->fb_id);
				}

				/* will trigger modeset */
				drm->first_post = 1;
			} else if (!hdmi && drm->hdmi.active) {
				drm->hdmi.active = 0;

				ALOGD("destroy hdmi private buffer");
				gralloc_drm_bo_decref(drm->hdmi.bo);
				drm->hdmi.bo = NULL;
			}

			if (hdmi)
				drmModeFreeConnector(hdmi);

			pthread_mutex_unlock(&drm->hdmi_mutex);
		}
	}

	pthread_exit(NULL);
	return 0;
}


/*
 * Initialize KMS.
 */
int gralloc_drm_init_kms(struct gralloc_drm_t *drm)
{
	drmModeConnectorPtr lvds, hdmi;
	int i, ret;

	if (drm->resources)
		return 0;

	drm->resources = drmModeGetResources(drm->fd);
	if (!drm->resources) {
		ALOGE("failed to get modeset resources");
		return -EINVAL;
	}

	drm->plane_resources = drmModeGetPlaneResources(drm->fd);
	if (!drm->plane_resources) {
		ALOGD("no planes found from drm resources");
	} else {
		unsigned int i, j;

		ALOGD("supported drm planes and formats");
		/* fill a helper structure for hwcomposer */
		drm->planes = calloc(drm->plane_resources->count_planes,
			sizeof(struct gralloc_drm_plane_t));

		for (i = 0; i < drm->plane_resources->count_planes; i++) {
			drm->planes[i].drm_plane = drmModeGetPlane(drm->fd,
				drm->plane_resources->planes[i]);

			ALOGD("plane id %d", drm->planes[i].drm_plane->plane_id);
			for (j = 0; j < drm->planes[i].drm_plane->count_formats; j++)
				ALOGD("    format %c%c%c%c",
					(drm->planes[i].drm_plane->formats[j]),
					(drm->planes[i].drm_plane->formats[j])>>8,
					(drm->planes[i].drm_plane->formats[j])>>16,
					(drm->planes[i].drm_plane->formats[j])>>24);
		}
	}

	/* find the crtc/connector/mode to use */
	lvds = fetch_connector(drm, DRM_MODE_CONNECTOR_LVDS);
	if (lvds) {
		drm_kms_init_with_connector(drm, &drm->primary, lvds);
		drmModeFreeConnector(lvds);
		drm->primary.active = 1;
	}

	/* if still no connector, find first connected connector and try it */
	if (!drm->primary.active) {

		for (i = 0; i < drm->resources->count_connectors; i++) {
			drmModeConnectorPtr connector;

			connector = drmModeGetConnector(drm->fd,
					drm->resources->connectors[i]);
			if (connector) {
				if (connector->connection == DRM_MODE_CONNECTED) {
					if (!drm_kms_init_with_connector(drm,
							&drm->primary, connector))
						break;
				}

				drmModeFreeConnector(connector);
			}
		}
		if (i == drm->resources->count_connectors) {
			ALOGE("failed to find a valid crtc/connector/mode combination");
			drmModeFreeResources(drm->resources);
			drm->resources = NULL;

			return -EINVAL;
		}
	}

	/* HDMI mirror mode need driver support for blitting. which is not implemented for
		drivers other than intel. skip HDMI detection for them to avoid crash
	*/
	if (!drm->drv->blit)
		goto skip_hdmi_modes;

	/* check if hdmi is connected already */
	hdmi = fetch_connector(drm, DRM_MODE_CONNECTOR_HDMIA);
	if (hdmi) {

		if (hdmi->connector_id == drm->primary.connector_id) {
			/* special case: our primary connector is hdmi */
			ALOGD("hdmi is the primary connector");
			goto skip_hdmi_modes;
		}

		ALOGD("init hdmi on startup");
		init_hdmi_output(drm, hdmi);

		drmModeFreeConnector(hdmi);
	}

	/* launch hdmi observer thread */
	pthread_mutex_init(&drm->hdmi_mutex, NULL);
	pthread_create(&drm->hdmi_hotplug_thread, NULL, hdmi_observer, drm);

skip_hdmi_modes:

	drm_kms_init_features(drm);
	drm->first_post = 1;

	return 0;
}

void gralloc_drm_fini_kms(struct gralloc_drm_t *drm)
{
	switch (drm->swap_mode) {
	case DRM_SWAP_FLIP:
		drm_kms_page_flip(drm, NULL);
		break;
	case DRM_SWAP_COPY:
		{
			struct gralloc_drm_bo_t **bo = (drm->current_front) ?
				&drm->current_front : &drm->next_front;

			if (*bo)
				gralloc_drm_bo_decref(*bo);
			*bo = NULL;
		}
		break;
	default:
		break;
	}

	/* restore crtc? */

	if (drm->resources) {
		drmModeFreeResources(drm->resources);
		drm->resources = NULL;
	}

	if (drm->planes) {
		unsigned int i;
		for (i = 0; i < drm->plane_resources->count_planes; i++)
			drmModeFreePlane(drm->planes[i].drm_plane);
		free(drm->planes);
		drm->planes = NULL;
	}

	if (drm->plane_resources) {
		drmModeFreePlaneResources(drm->plane_resources);
		drm->plane_resources = NULL;
	}

	/* destroy private buffer of hdmi output */
	if (drm->hdmi.bo)
		gralloc_drm_bo_decref(drm->hdmi.bo);

	drm_singleton = NULL;
}

int gralloc_drm_is_kms_initialized(struct gralloc_drm_t *drm)
{
	return (drm->resources != NULL);
}

/*
 * Initialize a framebuffer device with KMS info.
 */
void gralloc_drm_get_kms_info(struct gralloc_drm_t *drm,
		struct framebuffer_device_t *fb)
{
	*((uint32_t *) &fb->flags) = 0x0;
	*((uint32_t *) &fb->width) = drm->primary.mode.hdisplay;
	*((uint32_t *) &fb->height) = drm->primary.mode.vdisplay;
	*((int *)      &fb->stride) = drm->primary.mode.hdisplay;
	*((float *)    &fb->fps) = drm->primary.mode.vrefresh;

	*((int *)      &fb->format) = drm->primary.fb_format;
	*((float *)    &fb->xdpi) = drm->primary.xdpi;
	*((float *)    &fb->ydpi) = drm->primary.ydpi;
	*((int *)      &fb->minSwapInterval) = drm->swap_interval;
	*((int *)      &fb->maxSwapInterval) = drm->swap_interval;
}

/*
 * Return true if fb posting is pipelined.
 */
int gralloc_drm_is_kms_pipelined(struct gralloc_drm_t *drm)
{
	return (drm->swap_mode != DRM_SWAP_SETCRTC);
}