aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_connector.c
blob: 48ca2457df8c964977f3f7edae0980bc227b97cf (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
/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <drm/drmP.h>
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>

#include "drm_crtc_internal.h"
#include "drm_internal.h"

/**
 * DOC: overview
 *
 * In DRM connectors are the general abstraction for display sinks, and include
 * als fixed panels or anything else that can display pixels in some form. As
 * opposed to all other KMS objects representing hardware (like CRTC, encoder or
 * plane abstractions) connectors can be hotplugged and unplugged at runtime.
 * Hence they are reference-counted using drm_connector_get() and
 * drm_connector_put().
 *
 * KMS driver must create, initialize, register and attach at a &struct
 * drm_connector for each such sink. The instance is created as other KMS
 * objects and initialized by setting the following fields. The connector is
 * initialized with a call to drm_connector_init() with a pointer to the
 * &struct drm_connector_funcs and a connector type, and then exposed to
 * userspace with a call to drm_connector_register().
 *
 * Connectors must be attached to an encoder to be used. For devices that map
 * connectors to encoders 1:1, the connector should be attached at
 * initialization time with a call to drm_mode_connector_attach_encoder(). The
 * driver must also set the &drm_connector.encoder field to point to the
 * attached encoder.
 *
 * For connectors which are not fixed (like built-in panels) the driver needs to
 * support hotplug notifications. The simplest way to do that is by using the
 * probe helpers, see drm_kms_helper_poll_init() for connectors which don't have
 * hardware support for hotplug interrupts. Connectors with hardware hotplug
 * support can instead use e.g. drm_helper_hpd_irq_event().
 */

struct drm_conn_prop_enum_list {
	int type;
	const char *name;
	struct ida ida;
};

/*
 * Connector and encoder types.
 */
static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
	{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
	{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
	{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
	{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
	{ DRM_MODE_CONNECTOR_Composite, "Composite" },
	{ DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
	{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
	{ DRM_MODE_CONNECTOR_Component, "Component" },
	{ DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
	{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
	{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
	{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
	{ DRM_MODE_CONNECTOR_TV, "TV" },
	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
	{ DRM_MODE_CONNECTOR_DPI, "DPI" },
};

void drm_connector_ida_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
		ida_init(&drm_connector_enum_list[i].ida);
}

void drm_connector_ida_destroy(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
		ida_destroy(&drm_connector_enum_list[i].ida);
}

/**
 * drm_connector_get_cmdline_mode - reads the user's cmdline mode
 * @connector: connector to quwery
 *
 * The kernel supports per-connector configuration of its consoles through
 * use of the video= parameter. This function parses that option and
 * extracts the user's specified mode (or enable/disable status) for a
 * particular connector. This is typically only used during the early fbdev
 * setup.
 */
static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
{
	struct drm_cmdline_mode *mode = &connector->cmdline_mode;
	char *option = NULL;

	if (fb_get_options(connector->name, &option))
		return;

	if (!drm_mode_parse_command_line_for_connector(option,
						       connector,
						       mode))
		return;

	if (mode->force) {
		DRM_INFO("forcing %s connector %s\n", connector->name,
			 drm_get_connector_force_name(mode->force));
		connector->force = mode->force;
	}

	DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
		      connector->name,
		      mode->xres, mode->yres,
		      mode->refresh_specified ? mode->refresh : 60,
		      mode->rb ? " reduced blanking" : "",
		      mode->margins ? " with margins" : "",
		      mode->interlace ?  " interlaced" : "");
}

static void drm_connector_free(struct kref *kref)
{
	struct drm_connector *connector =
		container_of(kref, struct drm_connector, base.refcount);
	struct drm_device *dev = connector->dev;

	drm_mode_object_unregister(dev, &connector->base);
	connector->funcs->destroy(connector);
}

/**
 * drm_connector_init - Init a preallocated connector
 * @dev: DRM device
 * @connector: the connector to init
 * @funcs: callbacks for this connector
 * @connector_type: user visible type of the connector
 *
 * Initialises a preallocated connector. Connectors should be
 * subclassed as part of driver connector objects.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_connector_init(struct drm_device *dev,
		       struct drm_connector *connector,
		       const struct drm_connector_funcs *funcs,
		       int connector_type)
{
	struct drm_mode_config *config = &dev->mode_config;
	int ret;
	struct ida *connector_ida =
		&drm_connector_enum_list[connector_type].ida;

	ret = __drm_mode_object_add(dev, &connector->base,
				    DRM_MODE_OBJECT_CONNECTOR,
				    false, drm_connector_free);
	if (ret)
		return ret;

	connector->base.properties = &connector->properties;
	connector->dev = dev;
	connector->funcs = funcs;

	ret = ida_simple_get(&config->connector_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
		goto out_put;
	connector->index = ret;
	ret = 0;

	connector->connector_type = connector_type;
	connector->connector_type_id =
		ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
	if (connector->connector_type_id < 0) {
		ret = connector->connector_type_id;
		goto out_put_id;
	}
	connector->name =
		kasprintf(GFP_KERNEL, "%s-%d",
			  drm_connector_enum_list[connector_type].name,
			  connector->connector_type_id);
	if (!connector->name) {
		ret = -ENOMEM;
		goto out_put_type_id;
	}

	INIT_LIST_HEAD(&connector->probed_modes);
	INIT_LIST_HEAD(&connector->modes);
	mutex_init(&connector->mutex);
	connector->edid_blob_ptr = NULL;
	connector->status = connector_status_unknown;

	drm_connector_get_cmdline_mode(connector);

	/* We should add connectors at the end to avoid upsetting the connector
	 * index too much. */
	spin_lock_irq(&config->connector_list_lock);
	list_add_tail(&connector->head, &config->connector_list);
	config->num_connector++;
	spin_unlock_irq(&config->connector_list_lock);

	if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL)
		drm_object_attach_property(&connector->base,
					      config->edid_property,
					      0);

	drm_object_attach_property(&connector->base,
				      config->dpms_property, 0);

	drm_object_attach_property(&connector->base,
				   config->link_status_property,
				   0);

	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
		drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
	}

	connector->debugfs_entry = NULL;
out_put_type_id:
	if (ret)
		ida_simple_remove(connector_ida, connector->connector_type_id);
out_put_id:
	if (ret)
		ida_simple_remove(&config->connector_ida, connector->index);
out_put:
	if (ret)
		drm_mode_object_unregister(dev, &connector->base);

	return ret;
}
EXPORT_SYMBOL(drm_connector_init);

/**
 * drm_mode_connector_attach_encoder - attach a connector to an encoder
 * @connector: connector to attach
 * @encoder: encoder to attach @connector to
 *
 * This function links up a connector to an encoder. Note that the routing
 * restrictions between encoders and crtcs are exposed to userspace through the
 * possible_clones and possible_crtcs bitmasks.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_connector_attach_encoder(struct drm_connector *connector,
				      struct drm_encoder *encoder)
{
	int i;

	/*
	 * In the past, drivers have attempted to model the static association
	 * of connector to encoder in simple connector/encoder devices using a
	 * direct assignment of connector->encoder = encoder. This connection
	 * is a logical one and the responsibility of the core, so drivers are
	 * expected not to mess with this.
	 *
	 * Note that the error return should've been enough here, but a large
	 * majority of drivers ignores the return value, so add in a big WARN
	 * to get people's attention.
	 */
	if (WARN_ON(connector->encoder))
		return -EINVAL;

	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
		if (connector->encoder_ids[i] == 0) {
			connector->encoder_ids[i] = encoder->base.id;
			return 0;
		}
	}
	return -ENOMEM;
}
EXPORT_SYMBOL(drm_mode_connector_attach_encoder);

static void drm_mode_remove(struct drm_connector *connector,
			    struct drm_display_mode *mode)
{
	list_del(&mode->head);
	drm_mode_destroy(connector->dev, mode);
}

/**
 * drm_connector_cleanup - cleans up an initialised connector
 * @connector: connector to cleanup
 *
 * Cleans up the connector but doesn't free the object.
 */
void drm_connector_cleanup(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_display_mode *mode, *t;

	/* The connector should have been removed from userspace long before
	 * it is finally destroyed.
	 */
	if (WARN_ON(connector->registered))
		drm_connector_unregister(connector);

	if (connector->tile_group) {
		drm_mode_put_tile_group(dev, connector->tile_group);
		connector->tile_group = NULL;
	}

	list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
		drm_mode_remove(connector, mode);

	list_for_each_entry_safe(mode, t, &connector->modes, head)
		drm_mode_remove(connector, mode);

	ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida,
			  connector->connector_type_id);

	ida_simple_remove(&dev->mode_config.connector_ida,
			  connector->index);

	kfree(connector->display_info.bus_formats);
	drm_mode_object_unregister(dev, &connector->base);
	kfree(connector->name);
	connector->name = NULL;
	spin_lock_irq(&dev->mode_config.connector_list_lock);
	list_del(&connector->head);
	dev->mode_config.num_connector--;
	spin_unlock_irq(&dev->mode_config.connector_list_lock);

	WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
	if (connector->state && connector->funcs->atomic_destroy_state)
		connector->funcs->atomic_destroy_state(connector,
						       connector->state);

	mutex_destroy(&connector->mutex);

	memset(connector, 0, sizeof(*connector));
}
EXPORT_SYMBOL(drm_connector_cleanup);

/**
 * drm_connector_register - register a connector
 * @connector: the connector to register
 *
 * Register userspace interfaces for a connector
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_connector_register(struct drm_connector *connector)
{
	int ret = 0;

	if (!connector->dev->registered)
		return 0;

	mutex_lock(&connector->mutex);
	if (connector->registered)
		goto unlock;

	ret = drm_sysfs_connector_add(connector);
	if (ret)
		goto unlock;

	ret = drm_debugfs_connector_add(connector);
	if (ret) {
		goto err_sysfs;
	}

	if (connector->funcs->late_register) {
		ret = connector->funcs->late_register(connector);
		if (ret)
			goto err_debugfs;
	}

	drm_mode_object_register(connector->dev, &connector->base);

	connector->registered = true;
	goto unlock;

err_debugfs:
	drm_debugfs_connector_remove(connector);
err_sysfs:
	drm_sysfs_connector_remove(connector);
unlock:
	mutex_unlock(&connector->mutex);
	return ret;
}
EXPORT_SYMBOL(drm_connector_register);

/**
 * drm_connector_unregister - unregister a connector
 * @connector: the connector to unregister
 *
 * Unregister userspace interfaces for a connector
 */
void drm_connector_unregister(struct drm_connector *connector)
{
	mutex_lock(&connector->mutex);
	if (!connector->registered) {
		mutex_unlock(&connector->mutex);
		return;
	}

	if (connector->funcs->early_unregister)
		connector->funcs->early_unregister(connector);

	drm_sysfs_connector_remove(connector);
	drm_debugfs_connector_remove(connector);

	connector->registered = false;
	mutex_unlock(&connector->mutex);
}
EXPORT_SYMBOL(drm_connector_unregister);

void drm_connector_unregister_all(struct drm_device *dev)
{
	struct drm_connector *connector;
	struct drm_connector_list_iter conn_iter;

	drm_connector_list_iter_begin(dev, &conn_iter);
	drm_for_each_connector_iter(connector, &conn_iter)
		drm_connector_unregister(connector);
	drm_connector_list_iter_end(&conn_iter);
}

int drm_connector_register_all(struct drm_device *dev)
{
	struct drm_connector *connector;
	struct drm_connector_list_iter conn_iter;
	int ret = 0;

	drm_connector_list_iter_begin(dev, &conn_iter);
	drm_for_each_connector_iter(connector, &conn_iter) {
		ret = drm_connector_register(connector);
		if (ret)
			break;
	}
	drm_connector_list_iter_end(&conn_iter);

	if (ret)
		drm_connector_unregister_all(dev);
	return ret;
}

/**
 * drm_get_connector_status_name - return a string for connector status
 * @status: connector status to compute name of
 *
 * In contrast to the other drm_get_*_name functions this one here returns a
 * const pointer and hence is threadsafe.
 */
const char *drm_get_connector_status_name(enum drm_connector_status status)
{
	if (status == connector_status_connected)
		return "connected";
	else if (status == connector_status_disconnected)
		return "disconnected";
	else
		return "unknown";
}
EXPORT_SYMBOL(drm_get_connector_status_name);

/**
 * drm_get_connector_force_name - return a string for connector force
 * @force: connector force to get name of
 *
 * Returns: const pointer to name.
 */
const char *drm_get_connector_force_name(enum drm_connector_force force)
{
	switch (force) {
	case DRM_FORCE_UNSPECIFIED:
		return "unspecified";
	case DRM_FORCE_OFF:
		return "off";
	case DRM_FORCE_ON:
		return "on";
	case DRM_FORCE_ON_DIGITAL:
		return "digital";
	default:
		return "unknown";
	}
}

#ifdef CONFIG_LOCKDEP
static struct lockdep_map connector_list_iter_dep_map = {
	.name = "drm_connector_list_iter"
};
#endif

/**
 * drm_connector_list_iter_begin - initialize a connector_list iterator
 * @dev: DRM device
 * @iter: connector_list iterator
 *
 * Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
 * must always be cleaned up again by calling drm_connector_list_iter_end().
 * Iteration itself happens using drm_connector_list_iter_next() or
 * drm_for_each_connector_iter().
 */
void drm_connector_list_iter_begin(struct drm_device *dev,
				   struct drm_connector_list_iter *iter)
{
	iter->dev = dev;
	iter->conn = NULL;
	lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_);
}
EXPORT_SYMBOL(drm_connector_list_iter_begin);

/**
 * drm_connector_list_iter_next - return next connector
 * @iter: connectr_list iterator
 *
 * Returns the next connector for @iter, or NULL when the list walk has
 * completed.
 */
struct drm_connector *
drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
{
	struct drm_connector *old_conn = iter->conn;
	struct drm_mode_config *config = &iter->dev->mode_config;
	struct list_head *lhead;
	unsigned long flags;

	spin_lock_irqsave(&config->connector_list_lock, flags);
	lhead = old_conn ? &old_conn->head : &config->connector_list;

	do {
		if (lhead->next == &config->connector_list) {
			iter->conn = NULL;
			break;
		}

		lhead = lhead->next;
		iter->conn = list_entry(lhead, struct drm_connector, head);

		/* loop until it's not a zombie connector */
	} while (!kref_get_unless_zero(&iter->conn->base.refcount));
	spin_unlock_irqrestore(&config->connector_list_lock, flags);

	if (old_conn)
		drm_connector_put(old_conn);

	return iter->conn;
}
EXPORT_SYMBOL(drm_connector_list_iter_next);

/**
 * drm_connector_list_iter_end - tear down a connector_list iterator
 * @iter: connector_list iterator
 *
 * Tears down @iter and releases any resources (like &drm_connector references)
 * acquired while walking the list. This must always be called, both when the
 * iteration completes fully or when it was aborted without walking the entire
 * list.
 */
void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
{
	iter->dev = NULL;
	if (iter->conn)
		drm_connector_put(iter->conn);
	lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
}
EXPORT_SYMBOL(drm_connector_list_iter_end);

static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
	{ SubPixelUnknown, "Unknown" },
	{ SubPixelHorizontalRGB, "Horizontal RGB" },
	{ SubPixelHorizontalBGR, "Horizontal BGR" },
	{ SubPixelVerticalRGB, "Vertical RGB" },
	{ SubPixelVerticalBGR, "Vertical BGR" },
	{ SubPixelNone, "None" },
};

/**
 * drm_get_subpixel_order_name - return a string for a given subpixel enum
 * @order: enum of subpixel_order
 *
 * Note you could abuse this and return something out of bounds, but that
 * would be a caller error.  No unscrubbed user data should make it here.
 */
const char *drm_get_subpixel_order_name(enum subpixel_order order)
{
	return drm_subpixel_enum_list[order].name;
}
EXPORT_SYMBOL(drm_get_subpixel_order_name);

static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
	{ DRM_MODE_DPMS_ON, "On" },
	{ DRM_MODE_DPMS_STANDBY, "Standby" },
	{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
	{ DRM_MODE_DPMS_OFF, "Off" }
};
DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)

static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
	{ DRM_MODE_LINK_STATUS_GOOD, "Good" },
	{ DRM_MODE_LINK_STATUS_BAD, "Bad" },
};
DRM_ENUM_NAME_FN(drm_get_link_status_name, drm_link_status_enum_list)

/**
 * drm_display_info_set_bus_formats - set the supported bus formats
 * @info: display info to store bus formats in
 * @formats: array containing the supported bus formats
 * @num_formats: the number of entries in the fmts array
 *
 * Store the supported bus formats in display info structure.
 * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
 * a full list of available formats.
 */
int drm_display_info_set_bus_formats(struct drm_display_info *info,
				     const u32 *formats,
				     unsigned int num_formats)
{
	u32 *fmts = NULL;

	if (!formats && num_formats)
		return -EINVAL;

	if (formats && num_formats) {
		fmts = kmemdup(formats, sizeof(*formats) * num_formats,
			       GFP_KERNEL);
		if (!fmts)
			return -ENOMEM;
	}

	kfree(info->bus_formats);
	info->bus_formats = fmts;
	info->num_bus_formats = num_formats;

	return 0;
}
EXPORT_SYMBOL(drm_display_info_set_bus_formats);

/* Optional connector properties. */
static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
	{ DRM_MODE_SCALE_NONE, "None" },
	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
	{ DRM_MODE_SCALE_CENTER, "Center" },
	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
};

static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
	{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
	{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
	{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
};

static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
};
DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)

static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
};
DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
		 drm_dvi_i_subconnector_enum_list)

static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
};
DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)

static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
};
DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
		 drm_tv_subconnector_enum_list)

/**
 * DOC: standard connector properties
 *
 * DRM connectors have a few standardized properties:
 *
 * EDID:
 * 	Blob property which contains the current EDID read from the sink. This
 * 	is useful to parse sink identification information like vendor, model
 * 	and serial. Drivers should update this property by calling
 * 	drm_mode_connector_update_edid_property(), usually after having parsed
 * 	the EDID using drm_add_edid_modes(). Userspace cannot change this
 * 	property.
 * DPMS:
 * 	Legacy property for setting the power state of the connector. For atomic
 * 	drivers this is only provided for backwards compatibility with existing
 * 	drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
 * 	connector is linked to. Drivers should never set this property directly,
 * 	it is handled by the DRM core by calling the &drm_connector_funcs.dpms
 * 	callback. Atomic drivers should implement this hook using
 * 	drm_atomic_helper_connector_dpms(). This is the only property standard
 * 	connector property that userspace can change.
 * PATH:
 * 	Connector path property to identify how this sink is physically
 * 	connected. Used by DP MST. This should be set by calling
 * 	drm_mode_connector_set_path_property(), in the case of DP MST with the
 * 	path property the MST manager created. Userspace cannot change this
 * 	property.
 * TILE:
 * 	Connector tile group property to indicate how a set of DRM connector
 * 	compose together into one logical screen. This is used by both high-res
 * 	external screens (often only using a single cable, but exposing multiple
 * 	DP MST sinks), or high-res integrated panels (like dual-link DSI) which
 * 	are not gen-locked. Note that for tiled panels which are genlocked, like
 * 	dual-link LVDS or dual-link DSI, the driver should try to not expose the
 * 	tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
 * 	should update this value using drm_mode_connector_set_tile_property().
 * 	Userspace cannot change this property.
 * link-status:
 *      Connector link-status property to indicate the status of link. The default
 *      value of link-status is "GOOD". If something fails during or after modeset,
 *      the kernel driver may set this to "BAD" and issue a hotplug uevent. Drivers
 *      should update this value using drm_mode_connector_set_link_status_property().
 *
 * Connectors also have one standardized atomic property:
 *
 * CRTC_ID:
 * 	Mode object ID of the &drm_crtc this connector should be connected to.
 */

int drm_connector_create_standard_properties(struct drm_device *dev)
{
	struct drm_property *prop;

	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
				   DRM_MODE_PROP_IMMUTABLE,
				   "EDID", 0);
	if (!prop)
		return -ENOMEM;
	dev->mode_config.edid_property = prop;

	prop = drm_property_create_enum(dev, 0,
				   "DPMS", drm_dpms_enum_list,
				   ARRAY_SIZE(drm_dpms_enum_list));
	if (!prop)
		return -ENOMEM;
	dev->mode_config.dpms_property = prop;

	prop = drm_property_create(dev,
				   DRM_MODE_PROP_BLOB |
				   DRM_MODE_PROP_IMMUTABLE,
				   "PATH", 0);
	if (!prop)
		return -ENOMEM;
	dev->mode_config.path_property = prop;

	prop = drm_property_create(dev,
				   DRM_MODE_PROP_BLOB |
				   DRM_MODE_PROP_IMMUTABLE,
				   "TILE", 0);
	if (!prop)
		return -ENOMEM;
	dev->mode_config.tile_property = prop;

	prop = drm_property_create_enum(dev, 0, "link-status",
					drm_link_status_enum_list,
					ARRAY_SIZE(drm_link_status_enum_list));
	if (!prop)
		return -ENOMEM;
	dev->mode_config.link_status_property = prop;

	return 0;
}

/**
 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
 * @dev: DRM device
 *
 * Called by a driver the first time a DVI-I connector is made.
 */
int drm_mode_create_dvi_i_properties(struct drm_device *dev)
{
	struct drm_property *dvi_i_selector;
	struct drm_property *dvi_i_subconnector;

	if (dev->mode_config.dvi_i_select_subconnector_property)
		return 0;

	dvi_i_selector =
		drm_property_create_enum(dev, 0,
				    "select subconnector",
				    drm_dvi_i_select_enum_list,
				    ARRAY_SIZE(drm_dvi_i_select_enum_list));
	dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;

	dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
				    "subconnector",
				    drm_dvi_i_subconnector_enum_list,
				    ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
	dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;

	return 0;
}
EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

/**
 * drm_create_tv_properties - create TV specific connector properties
 * @dev: DRM device
 * @num_modes: number of different TV formats (modes) supported
 * @modes: array of pointers to strings containing name of each format
 *
 * Called by a driver's TV initialization routine, this function creates
 * the TV specific connector properties for a given device.  Caller is
 * responsible for allocating a list of format names and passing them to
 * this routine.
 */
int drm_mode_create_tv_properties(struct drm_device *dev,
				  unsigned int num_modes,
				  const char * const modes[])
{
	struct drm_property *tv_selector;
	struct drm_property *tv_subconnector;
	unsigned int i;

	if (dev->mode_config.tv_select_subconnector_property)
		return 0;

	/*
	 * Basic connector properties
	 */
	tv_selector = drm_property_create_enum(dev, 0,
					  "select subconnector",
					  drm_tv_select_enum_list,
					  ARRAY_SIZE(drm_tv_select_enum_list));
	if (!tv_selector)
		goto nomem;

	dev->mode_config.tv_select_subconnector_property = tv_selector;

	tv_subconnector =
		drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
				    "subconnector",
				    drm_tv_subconnector_enum_list,
				    ARRAY_SIZE(drm_tv_subconnector_enum_list));
	if (!tv_subconnector)
		goto nomem;
	dev->mode_config.tv_subconnector_property = tv_subconnector;

	/*
	 * Other, TV specific properties: margins & TV modes.
	 */
	dev->mode_config.tv_left_margin_property =
		drm_property_create_range(dev, 0, "left margin", 0, 100);
	if (!dev->mode_config.tv_left_margin_property)
		goto nomem;

	dev->mode_config.tv_right_margin_property =
		drm_property_create_range(dev, 0, "right margin", 0, 100);
	if (!dev->mode_config.tv_right_margin_property)
		goto nomem;

	dev->mode_config.tv_top_margin_property =
		drm_property_create_range(dev, 0, "top margin", 0, 100);
	if (!dev->mode_config.tv_top_margin_property)
		goto nomem;

	dev->mode_config.tv_bottom_margin_property =
		drm_property_create_range(dev, 0, "bottom margin", 0, 100);
	if (!dev->mode_config.tv_bottom_margin_property)
		goto nomem;

	dev->mode_config.tv_mode_property =
		drm_property_create(dev, DRM_MODE_PROP_ENUM,
				    "mode", num_modes);
	if (!dev->mode_config.tv_mode_property)
		goto nomem;

	for (i = 0; i < num_modes; i++)
		drm_property_add_enum(dev->mode_config.tv_mode_property, i,
				      i, modes[i]);

	dev->mode_config.tv_brightness_property =
		drm_property_create_range(dev, 0, "brightness", 0, 100);
	if (!dev->mode_config.tv_brightness_property)
		goto nomem;

	dev->mode_config.tv_contrast_property =
		drm_property_create_range(dev, 0, "contrast", 0, 100);
	if (!dev->mode_config.tv_contrast_property)
		goto nomem;

	dev->mode_config.tv_flicker_reduction_property =
		drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
	if (!dev->mode_config.tv_flicker_reduction_property)
		goto nomem;

	dev->mode_config.tv_overscan_property =
		drm_property_create_range(dev, 0, "overscan", 0, 100);
	if (!dev->mode_config.tv_overscan_property)
		goto nomem;

	dev->mode_config.tv_saturation_property =
		drm_property_create_range(dev, 0, "saturation", 0, 100);
	if (!dev->mode_config.tv_saturation_property)
		goto nomem;

	dev->mode_config.tv_hue_property =
		drm_property_create_range(dev, 0, "hue", 0, 100);
	if (!dev->mode_config.tv_hue_property)
		goto nomem;

	return 0;
nomem:
	return -ENOMEM;
}
EXPORT_SYMBOL(drm_mode_create_tv_properties);

/**
 * drm_mode_create_scaling_mode_property - create scaling mode property
 * @dev: DRM device
 *
 * Called by a driver the first time it's needed, must be attached to desired
 * connectors.
 */
int drm_mode_create_scaling_mode_property(struct drm_device *dev)
{
	struct drm_property *scaling_mode;

	if (dev->mode_config.scaling_mode_property)
		return 0;

	scaling_mode =
		drm_property_create_enum(dev, 0, "scaling mode",
				drm_scaling_mode_enum_list,
				    ARRAY_SIZE(drm_scaling_mode_enum_list));

	dev->mode_config.scaling_mode_property = scaling_mode;

	return 0;
}
EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);

/**
 * drm_mode_create_aspect_ratio_property - create aspect ratio property
 * @dev: DRM device
 *
 * Called by a driver the first time it's needed, must be attached to desired
 * connectors.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
{
	if (dev->mode_config.aspect_ratio_property)
		return 0;

	dev->mode_config.aspect_ratio_property =
		drm_property_create_enum(dev, 0, "aspect ratio",
				drm_aspect_ratio_enum_list,
				ARRAY_SIZE(drm_aspect_ratio_enum_list));

	if (dev->mode_config.aspect_ratio_property == NULL)
		return -ENOMEM;

	return 0;
}
EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);

/**
 * drm_mode_create_suggested_offset_properties - create suggests offset properties
 * @dev: DRM device
 *
 * Create the the suggested x/y offset property for connectors.
 */
int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
{
	if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
		return 0;

	dev->mode_config.suggested_x_property =
		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);

	dev->mode_config.suggested_y_property =
		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);

	if (dev->mode_config.suggested_x_property == NULL ||
	    dev->mode_config.suggested_y_property == NULL)
		return -ENOMEM;
	return 0;
}
EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);

/**
 * drm_mode_connector_set_path_property - set tile property on connector
 * @connector: connector to set property on.
 * @path: path to use for property; must not be NULL.
 *
 * This creates a property to expose to userspace to specify a
 * connector path. This is mainly used for DisplayPort MST where
 * connectors have a topology and we want to allow userspace to give
 * them more meaningful names.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_connector_set_path_property(struct drm_connector *connector,
					 const char *path)
{
	struct drm_device *dev = connector->dev;
	int ret;

	ret = drm_property_replace_global_blob(dev,
	                                       &connector->path_blob_ptr,
	                                       strlen(path) + 1,
	                                       path,
	                                       &connector->base,
	                                       dev->mode_config.path_property);
	return ret;
}
EXPORT_SYMBOL(drm_mode_connector_set_path_property);

/**
 * drm_mode_connector_set_tile_property - set tile property on connector
 * @connector: connector to set property on.
 *
 * This looks up the tile information for a connector, and creates a
 * property for userspace to parse if it exists. The property is of
 * the form of 8 integers using ':' as a separator.
 *
 * Returns:
 * Zero on success, errno on failure.
 */
int drm_mode_connector_set_tile_property(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	char tile[256];
	int ret;

	if (!connector->has_tile) {
		ret  = drm_property_replace_global_blob(dev,
		                                        &connector->tile_blob_ptr,
		                                        0,
		                                        NULL,
		                                        &connector->base,
		                                        dev->mode_config.tile_property);
		return ret;
	}

	snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
		 connector->tile_group->id, connector->tile_is_single_monitor,
		 connector->num_h_tile, connector->num_v_tile,
		 connector->tile_h_loc, connector->tile_v_loc,
		 connector->tile_h_size, connector->tile_v_size);

	ret = drm_property_replace_global_blob(dev,
	                                       &connector->tile_blob_ptr,
	                                       strlen(tile) + 1,
	                                       tile,
	                                       &connector->base,
	                                       dev->mode_config.tile_property);
	return ret;
}
EXPORT_SYMBOL(drm_mode_connector_set_tile_property);

/**
 * drm_mode_connector_update_edid_property - update the edid property of a connector
 * @connector: drm connector
 * @edid: new value of the edid property
 *
 * This function creates a new blob modeset object and assigns its id to the
 * connector's edid property.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_connector_update_edid_property(struct drm_connector *connector,
					    const struct edid *edid)
{
	struct drm_device *dev = connector->dev;
	size_t size = 0;
	int ret;

	/* ignore requests to set edid when overridden */
	if (connector->override_edid)
		return 0;

	if (edid)
		size = EDID_LENGTH * (1 + edid->extensions);

	ret = drm_property_replace_global_blob(dev,
					       &connector->edid_blob_ptr,
	                                       size,
	                                       edid,
	                                       &connector->base,
	                                       dev->mode_config.edid_property);
	return ret;
}
EXPORT_SYMBOL(drm_mode_connector_update_edid_property);

/**
 * drm_mode_connector_set_link_status_property - Set link status property of a connector
 * @connector: drm connector
 * @link_status: new value of link status property (0: Good, 1: Bad)
 *
 * In usual working scenario, this link status property will always be set to
 * "GOOD". If something fails during or after a mode set, the kernel driver
 * may set this link status property to "BAD". The caller then needs to send a
 * hotplug uevent for userspace to re-check the valid modes through
 * GET_CONNECTOR_IOCTL and retry modeset.
 *
 * Note: Drivers cannot rely on userspace to support this property and
 * issue a modeset. As such, they may choose to handle issues (like
 * re-training a link) without userspace's intervention.
 *
 * The reason for adding this property is to handle link training failures, but
 * it is not limited to DP or link training. For example, if we implement
 * asynchronous setcrtc, this property can be used to report any failures in that.
 */
void drm_mode_connector_set_link_status_property(struct drm_connector *connector,
						 uint64_t link_status)
{
	struct drm_device *dev = connector->dev;

	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
	connector->state->link_status = link_status;
	drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
EXPORT_SYMBOL(drm_mode_connector_set_link_status_property);

int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
				    struct drm_property *property,
				    uint64_t value)
{
	int ret = -EINVAL;
	struct drm_connector *connector = obj_to_connector(obj);

	/* Do DPMS ourselves */
	if (property == connector->dev->mode_config.dpms_property) {
		ret = (*connector->funcs->dpms)(connector, (int)value);
	} else if (connector->funcs->set_property)
		ret = connector->funcs->set_property(connector, property, value);

	/* store the property value if successful */
	if (!ret)
		drm_object_property_set_value(&connector->base, property, value);
	return ret;
}

int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
				       void *data, struct drm_file *file_priv)
{
	struct drm_mode_connector_set_property *conn_set_prop = data;
	struct drm_mode_obj_set_property obj_set_prop = {
		.value = conn_set_prop->value,
		.prop_id = conn_set_prop->prop_id,
		.obj_id = conn_set_prop->connector_id,
		.obj_type = DRM_MODE_OBJECT_CONNECTOR
	};

	/* It does all the locking and checking we need */
	return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
}

static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
{
	/* For atomic drivers only state objects are synchronously updated and
	 * protected by modeset locks, so check those first. */
	if (connector->state)
		return connector->state->best_encoder;
	return connector->encoder;
}

static bool drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
					 const struct drm_file *file_priv)
{
	/*
	 * If user-space hasn't configured the driver to expose the stereo 3D
	 * modes, don't expose them.
	 */
	if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
		return false;

	return true;
}

int drm_mode_getconnector(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct drm_mode_get_connector *out_resp = data;
	struct drm_connector *connector;
	struct drm_encoder *encoder;
	struct drm_display_mode *mode;
	int mode_count = 0;
	int encoders_count = 0;
	int ret = 0;
	int copied = 0;
	int i;
	struct drm_mode_modeinfo u_mode;
	struct drm_mode_modeinfo __user *mode_ptr;
	uint32_t __user *encoder_ptr;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));

	connector = drm_connector_lookup(dev, out_resp->connector_id);
	if (!connector)
		return -ENOENT;

	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
		if (connector->encoder_ids[i] != 0)
			encoders_count++;

	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
		copied = 0;
		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
			if (connector->encoder_ids[i] != 0) {
				if (put_user(connector->encoder_ids[i],
					     encoder_ptr + copied)) {
					ret = -EFAULT;
					goto out;
				}
				copied++;
			}
		}
	}
	out_resp->count_encoders = encoders_count;

	out_resp->connector_id = connector->base.id;
	out_resp->connector_type = connector->connector_type;
	out_resp->connector_type_id = connector->connector_type_id;

	mutex_lock(&dev->mode_config.mutex);
	if (out_resp->count_modes == 0) {
		connector->funcs->fill_modes(connector,
					     dev->mode_config.max_width,
					     dev->mode_config.max_height);
	}

	out_resp->mm_width = connector->display_info.width_mm;
	out_resp->mm_height = connector->display_info.height_mm;
	out_resp->subpixel = connector->display_info.subpixel_order;
	out_resp->connection = connector->status;

	/* delayed so we get modes regardless of pre-fill_modes state */
	list_for_each_entry(mode, &connector->modes, head)
		if (drm_mode_expose_to_userspace(mode, file_priv))
			mode_count++;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if ((out_resp->count_modes >= mode_count) && mode_count) {
		copied = 0;
		mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
		list_for_each_entry(mode, &connector->modes, head) {
			if (!drm_mode_expose_to_userspace(mode, file_priv))
				continue;

			drm_mode_convert_to_umode(&u_mode, mode);
			if (copy_to_user(mode_ptr + copied,
					 &u_mode, sizeof(u_mode))) {
				ret = -EFAULT;
				mutex_unlock(&dev->mode_config.mutex);

				goto out;
			}
			copied++;
		}
	}
	out_resp->count_modes = mode_count;
	mutex_unlock(&dev->mode_config.mutex);

	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
	encoder = drm_connector_get_encoder(connector);
	if (encoder)
		out_resp->encoder_id = encoder->base.id;
	else
		out_resp->encoder_id = 0;

	/* Only grab properties after probing, to make sure EDID and other
	 * properties reflect the latest status. */
	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
			&out_resp->count_props);
	drm_modeset_unlock(&dev->mode_config.connection_mutex);

out:
	drm_connector_put(connector);

	return ret;
}


/**
 * DOC: Tile group
 *
 * Tile groups are used to represent tiled monitors with a unique integer
 * identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
 * we store this in a tile group, so we have a common identifier for all tiles
 * in a monitor group. The property is called "TILE". Drivers can manage tile
 * groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
 * drm_mode_get_tile_group(). But this is only needed for internal panels where
 * the tile group information is exposed through a non-standard way.
 */

static void drm_tile_group_free(struct kref *kref)
{
	struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
	struct drm_device *dev = tg->dev;
	mutex_lock(&dev->mode_config.idr_mutex);
	idr_remove(&dev->mode_config.tile_idr, tg->id);
	mutex_unlock(&dev->mode_config.idr_mutex);
	kfree(tg);
}

/**
 * drm_mode_put_tile_group - drop a reference to a tile group.
 * @dev: DRM device
 * @tg: tile group to drop reference to.
 *
 * drop reference to tile group and free if 0.
 */
void drm_mode_put_tile_group(struct drm_device *dev,
			     struct drm_tile_group *tg)
{
	kref_put(&tg->refcount, drm_tile_group_free);
}
EXPORT_SYMBOL(drm_mode_put_tile_group);

/**
 * drm_mode_get_tile_group - get a reference to an existing tile group
 * @dev: DRM device
 * @topology: 8-bytes unique per monitor.
 *
 * Use the unique bytes to get a reference to an existing tile group.
 *
 * RETURNS:
 * tile group or NULL if not found.
 */
struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
					       char topology[8])
{
	struct drm_tile_group *tg;
	int id;
	mutex_lock(&dev->mode_config.idr_mutex);
	idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
		if (!memcmp(tg->group_data, topology, 8)) {
			if (!kref_get_unless_zero(&tg->refcount))
				tg = NULL;
			mutex_unlock(&dev->mode_config.idr_mutex);
			return tg;
		}
	}
	mutex_unlock(&dev->mode_config.idr_mutex);
	return NULL;
}
EXPORT_SYMBOL(drm_mode_get_tile_group);

/**
 * drm_mode_create_tile_group - create a tile group from a displayid description
 * @dev: DRM device
 * @topology: 8-bytes unique per monitor.
 *
 * Create a tile group for the unique monitor, and get a unique
 * identifier for the tile group.
 *
 * RETURNS:
 * new tile group or error.
 */
struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
						  char topology[8])
{
	struct drm_tile_group *tg;
	int ret;

	tg = kzalloc(sizeof(*tg), GFP_KERNEL);
	if (!tg)
		return ERR_PTR(-ENOMEM);

	kref_init(&tg->refcount);
	memcpy(tg->group_data, topology, 8);
	tg->dev = dev;

	mutex_lock(&dev->mode_config.idr_mutex);
	ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
	if (ret >= 0) {
		tg->id = ret;
	} else {
		kfree(tg);
		tg = ERR_PTR(ret);
	}

	mutex_unlock(&dev->mode_config.idr_mutex);
	return tg;
}
EXPORT_SYMBOL(drm_mode_create_tile_group);