summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/rockchip/cdn-dp-core.c
blob: 3feab563e50a7e40232b43e9d2bc2c8b9d14a4f4 (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
/*
 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
 * Author: Chris Zhong <zyw@rock-chips.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

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

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/extcon.h>
#include <linux/firmware.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/mfd/syscon.h>
#include <linux/phy/phy.h>

#include <sound/hdmi-codec.h>

#include "cdn-dp-core.h"
#include "cdn-dp-reg.h"
#include "rockchip_drm_vop.h"

#define connector_to_dp(c) \
		container_of(c, struct cdn_dp_device, connector)

#define encoder_to_dp(c) \
		container_of(c, struct cdn_dp_device, encoder)

#define GRF_SOC_CON9		0x6224
#define DP_SEL_VOP_LIT		BIT(12)
#define GRF_SOC_CON26		0x6268
#define DPTX_HPD_SEL		(3 << 12)
#define DPTX_HPD_DEL		(2 << 12)
#define DPTX_HPD_SEL_MASK	(3 << 28)

#define CDN_FW_TIMEOUT_MS	(64 * 1000)
#define CDN_DPCD_TIMEOUT_MS	5000
#define CDN_DP_FIRMWARE		"rockchip/dptx.bin"

struct cdn_dp_data {
	u8 max_phy;
};

struct cdn_dp_data rk3399_cdn_dp = {
	.max_phy = 2,
};

static const struct of_device_id cdn_dp_dt_ids[] = {
	{ .compatible = "rockchip,rk3399-cdn-dp",
		.data = (void *)&rk3399_cdn_dp },
	{}
};

MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);

static int cdn_dp_grf_write(struct cdn_dp_device *dp,
			    unsigned int reg, unsigned int val)
{
	int ret;

	ret = clk_prepare_enable(dp->grf_clk);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
		return ret;
	}

	ret = regmap_write(dp->grf, reg, val);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
		clk_disable_unprepare(dp->grf_clk);
		return ret;
	}

	clk_disable_unprepare(dp->grf_clk);

	return 0;
}

static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
{
	int ret;
	unsigned long rate;

	ret = clk_prepare_enable(dp->pclk);
	if (ret < 0) {
		DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
		goto err_pclk;
	}

	ret = clk_prepare_enable(dp->core_clk);
	if (ret < 0) {
		DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
		goto err_core_clk;
	}

	ret = pm_runtime_get_sync(dp->dev);
	if (ret < 0) {
		DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
		goto err_pm_runtime_get;
	}

	reset_control_assert(dp->core_rst);
	reset_control_assert(dp->dptx_rst);
	reset_control_assert(dp->apb_rst);
	reset_control_deassert(dp->core_rst);
	reset_control_deassert(dp->dptx_rst);
	reset_control_deassert(dp->apb_rst);

	rate = clk_get_rate(dp->core_clk);
	if (!rate) {
		DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
		ret = -EINVAL;
		goto err_set_rate;
	}

	cdn_dp_set_fw_clk(dp, rate);
	cdn_dp_clock_reset(dp);

	return 0;

err_set_rate:
	pm_runtime_put(dp->dev);
err_pm_runtime_get:
	clk_disable_unprepare(dp->core_clk);
err_core_clk:
	clk_disable_unprepare(dp->pclk);
err_pclk:
	return ret;
}

static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
{
	pm_runtime_put_sync(dp->dev);
	clk_disable_unprepare(dp->pclk);
	clk_disable_unprepare(dp->core_clk);
}

static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
{
	struct extcon_dev *edev = port->extcon;
	union extcon_property_value property;
	int dptx;
	u8 lanes;

	dptx = extcon_get_state(edev, EXTCON_DISP_DP);
	if (dptx > 0) {
		extcon_get_property(edev, EXTCON_DISP_DP,
				    EXTCON_PROP_USB_SS, &property);
		if (property.intval)
			lanes = 2;
		else
			lanes = 4;
	} else {
		lanes = 0;
	}

	return lanes;
}

static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
{
	int ret;
	u8 value;

	*sink_count = 0;
	ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
	if (ret)
		return ret;

	*sink_count = DP_GET_SINK_COUNT(value);
	return 0;
}

static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
{
	struct cdn_dp_port *port;
	int i, lanes;

	for (i = 0; i < dp->ports; i++) {
		port = dp->port[i];
		lanes = cdn_dp_get_port_lanes(port);
		if (lanes)
			return port;
	}
	return NULL;
}

static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
	struct cdn_dp_port *port;
	u8 sink_count = 0;

	if (dp->active_port < 0 || dp->active_port >= dp->ports) {
		DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
		return false;
	}

	port = dp->port[dp->active_port];

	/*
	 * Attempt to read sink count, retry in case the sink may not be ready.
	 *
	 * Sinks are *supposed* to come up within 1ms from an off state, but
	 * some docks need more time to power up.
	 */
	while (time_before(jiffies, timeout)) {
		if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
			return false;

		if (!cdn_dp_get_sink_count(dp, &sink_count))
			return sink_count ? true : false;

		usleep_range(5000, 10000);
	}

	DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
	return false;
}

static enum drm_connector_status
cdn_dp_connector_detect(struct drm_connector *connector, bool force)
{
	struct cdn_dp_device *dp = connector_to_dp(connector);
	enum drm_connector_status status = connector_status_disconnected;

	mutex_lock(&dp->lock);
	if (dp->connected)
		status = connector_status_connected;
	mutex_unlock(&dp->lock);

	return status;
}

static void cdn_dp_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
	.detect = cdn_dp_connector_detect,
	.destroy = cdn_dp_connector_destroy,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int cdn_dp_connector_get_modes(struct drm_connector *connector)
{
	struct cdn_dp_device *dp = connector_to_dp(connector);
	struct edid *edid;
	int ret = 0;

	mutex_lock(&dp->lock);
	edid = dp->edid;
	if (edid) {
		DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
				  edid->width_cm, edid->height_cm);

		dp->sink_has_audio = drm_detect_monitor_audio(edid);
		ret = drm_add_edid_modes(connector, edid);
		if (ret)
			drm_connector_update_edid_property(connector,
								edid);
	}
	mutex_unlock(&dp->lock);

	return ret;
}

static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
				       struct drm_display_mode *mode)
{
	struct cdn_dp_device *dp = connector_to_dp(connector);
	struct drm_display_info *display_info = &dp->connector.display_info;
	u32 requested, actual, rate, sink_max, source_max = 0;
	u8 lanes, bpc;

	/* If DP is disconnected, every mode is invalid */
	if (!dp->connected)
		return MODE_BAD;

	switch (display_info->bpc) {
	case 10:
		bpc = 10;
		break;
	case 6:
		bpc = 6;
		break;
	default:
		bpc = 8;
		break;
	}

	requested = mode->clock * bpc * 3 / 1000;

	source_max = dp->lanes;
	sink_max = drm_dp_max_lane_count(dp->dpcd);
	lanes = min(source_max, sink_max);

	source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
	sink_max = drm_dp_max_link_rate(dp->dpcd);
	rate = min(source_max, sink_max);

	actual = rate * lanes / 100;

	/* efficiency is about 0.8 */
	actual = actual * 8 / 10;

	if (requested > actual) {
		DRM_DEV_DEBUG_KMS(dp->dev,
				  "requested=%d, actual=%d, clock=%d\n",
				  requested, actual, mode->clock);
		return MODE_CLOCK_HIGH;
	}

	return MODE_OK;
}

static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
	.get_modes = cdn_dp_connector_get_modes,
	.mode_valid = cdn_dp_connector_mode_valid,
};

static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
{
	int ret;
	const u32 *iram_data, *dram_data;
	const struct firmware *fw = dp->fw;
	const struct cdn_firmware_header *hdr;

	hdr = (struct cdn_firmware_header *)fw->data;
	if (fw->size != le32_to_cpu(hdr->size_bytes)) {
		DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
		return -EINVAL;
	}

	iram_data = (const u32 *)(fw->data + hdr->header_size);
	dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);

	ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
				   dram_data, hdr->dram_size);
	if (ret)
		return ret;

	ret = cdn_dp_set_firmware_active(dp, true);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
		return ret;
	}

	return cdn_dp_event_config(dp);
}

static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
{
	int ret;

	if (!cdn_dp_check_sink_connection(dp))
		return -ENODEV;

	ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
			       DP_RECEIVER_CAP_SIZE);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
		return ret;
	}

	kfree(dp->edid);
	dp->edid = drm_do_get_edid(&dp->connector,
				   cdn_dp_get_edid_block, dp);
	return 0;
}

static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
{
	union extcon_property_value property;
	int ret;

	if (!port->phy_enabled) {
		ret = phy_power_on(port->phy);
		if (ret) {
			DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
				      ret);
			goto err_phy;
		}
		port->phy_enabled = true;
	}

	ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
			       DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
		goto err_power_on;
	}

	ret = cdn_dp_get_hpd_status(dp);
	if (ret <= 0) {
		if (!ret)
			DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
		goto err_power_on;
	}

	ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
				  EXTCON_PROP_USB_TYPEC_POLARITY, &property);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "get property failed\n");
		goto err_power_on;
	}

	port->lanes = cdn_dp_get_port_lanes(port);
	ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
			      ret);
		goto err_power_on;
	}

	dp->active_port = port->id;
	return 0;

err_power_on:
	if (phy_power_off(port->phy))
		DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
	else
		port->phy_enabled = false;

err_phy:
	cdn_dp_grf_write(dp, GRF_SOC_CON26,
			 DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
	return ret;
}

static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
			      struct cdn_dp_port *port)
{
	int ret;

	if (port->phy_enabled) {
		ret = phy_power_off(port->phy);
		if (ret) {
			DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
			return ret;
		}
	}

	port->phy_enabled = false;
	port->lanes = 0;
	dp->active_port = -1;
	return 0;
}

static int cdn_dp_disable(struct cdn_dp_device *dp)
{
	int ret, i;

	if (!dp->active)
		return 0;

	for (i = 0; i < dp->ports; i++)
		cdn_dp_disable_phy(dp, dp->port[i]);

	ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
			       DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
			      ret);
		return ret;
	}

	cdn_dp_set_firmware_active(dp, false);
	cdn_dp_clk_disable(dp);
	dp->active = false;
	dp->link.rate = 0;
	dp->link.num_lanes = 0;
	if (!dp->connected) {
		kfree(dp->edid);
		dp->edid = NULL;
	}

	return 0;
}

static int cdn_dp_enable(struct cdn_dp_device *dp)
{
	int ret, i, lanes;
	struct cdn_dp_port *port;

	port = cdn_dp_connected_port(dp);
	if (!port) {
		DRM_DEV_ERROR(dp->dev,
			      "Can't enable without connection\n");
		return -ENODEV;
	}

	if (dp->active)
		return 0;

	ret = cdn_dp_clk_enable(dp);
	if (ret)
		return ret;

	ret = cdn_dp_firmware_init(dp);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
		goto err_clk_disable;
	}

	/* only enable the port that connected with downstream device */
	for (i = port->id; i < dp->ports; i++) {
		port = dp->port[i];
		lanes = cdn_dp_get_port_lanes(port);
		if (lanes) {
			ret = cdn_dp_enable_phy(dp, port);
			if (ret)
				continue;

			ret = cdn_dp_get_sink_capability(dp);
			if (ret) {
				cdn_dp_disable_phy(dp, port);
			} else {
				dp->active = true;
				dp->lanes = port->lanes;
				return 0;
			}
		}
	}

err_clk_disable:
	cdn_dp_clk_disable(dp);
	return ret;
}

static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
				    struct drm_display_mode *mode,
				    struct drm_display_mode *adjusted)
{
	struct cdn_dp_device *dp = encoder_to_dp(encoder);
	struct drm_display_info *display_info = &dp->connector.display_info;
	struct video_info *video = &dp->video_info;

	switch (display_info->bpc) {
	case 10:
		video->color_depth = 10;
		break;
	case 6:
		video->color_depth = 6;
		break;
	default:
		video->color_depth = 8;
		break;
	}

	video->color_fmt = PXL_RGB;
	video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
	video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);

	memcpy(&dp->mode, adjusted, sizeof(*mode));
}

static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
{
	u8 link_status[DP_LINK_STATUS_SIZE];
	struct cdn_dp_port *port = cdn_dp_connected_port(dp);
	u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);

	if (!port || !dp->link.rate || !dp->link.num_lanes)
		return false;

	if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
			     DP_LINK_STATUS_SIZE)) {
		DRM_ERROR("Failed to get link status\n");
		return false;
	}

	/* if link training is requested we should perform it always */
	return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
}

static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
{
	struct cdn_dp_device *dp = encoder_to_dp(encoder);
	int ret, val;

	ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
	if (ret < 0) {
		DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
		return;
	}

	DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
			  (ret) ? "LIT" : "BIG");
	if (ret)
		val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
	else
		val = DP_SEL_VOP_LIT << 16;

	ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
	if (ret)
		return;

	mutex_lock(&dp->lock);

	ret = cdn_dp_enable(dp);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
			      ret);
		goto out;
	}
	if (!cdn_dp_check_link_status(dp)) {
		ret = cdn_dp_train_link(dp);
		if (ret) {
			DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
			goto out;
		}
	}

	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
		goto out;
	}

	ret = cdn_dp_config_video(dp);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
		goto out;
	}

	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
	if (ret) {
		DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
		goto out;
	}
out:
	mutex_unlock(&dp->lock);
}

static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
{
	struct cdn_dp_device *dp = encoder_to_dp(encoder);
	int ret;

	mutex_lock(&dp->lock);
	if (dp->active) {
		ret = cdn_dp_disable(dp);
		if (ret) {
			DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
				      ret);
		}
	}
	mutex_unlock(&dp->lock);

	/*
	 * In the following 2 cases, we need to run the event_work to re-enable
	 * the DP:
	 * 1. If there is not just one port device is connected, and remove one
	 *    device from a port, the DP will be disabled here, at this case,
	 *    run the event_work to re-open DP for the other port.
	 * 2. If re-training or re-config failed, the DP will be disabled here.
	 *    run the event_work to re-connect it.
	 */
	if (!dp->connected && cdn_dp_connected_port(dp))
		schedule_work(&dp->event_work);
}

static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
				       struct drm_crtc_state *crtc_state,
				       struct drm_connector_state *conn_state)
{
	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);

	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
	s->output_type = DRM_MODE_CONNECTOR_DisplayPort;

	return 0;
}

static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
	.mode_set = cdn_dp_encoder_mode_set,
	.enable = cdn_dp_encoder_enable,
	.disable = cdn_dp_encoder_disable,
	.atomic_check = cdn_dp_encoder_atomic_check,
};

static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
{
	struct device *dev = dp->dev;
	struct device_node *np = dev->of_node;
	struct platform_device *pdev = to_platform_device(dev);
	struct resource *res;

	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
	if (IS_ERR(dp->grf)) {
		DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
		return PTR_ERR(dp->grf);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dp->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(dp->regs)) {
		DRM_DEV_ERROR(dev, "ioremap reg failed\n");
		return PTR_ERR(dp->regs);
	}

	dp->core_clk = devm_clk_get(dev, "core-clk");
	if (IS_ERR(dp->core_clk)) {
		DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
		return PTR_ERR(dp->core_clk);
	}

	dp->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(dp->pclk)) {
		DRM_DEV_ERROR(dev, "cannot get pclk\n");
		return PTR_ERR(dp->pclk);
	}

	dp->spdif_clk = devm_clk_get(dev, "spdif");
	if (IS_ERR(dp->spdif_clk)) {
		DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
		return PTR_ERR(dp->spdif_clk);
	}

	dp->grf_clk = devm_clk_get(dev, "grf");
	if (IS_ERR(dp->grf_clk)) {
		DRM_DEV_ERROR(dev, "cannot get grf clk\n");
		return PTR_ERR(dp->grf_clk);
	}

	dp->spdif_rst = devm_reset_control_get(dev, "spdif");
	if (IS_ERR(dp->spdif_rst)) {
		DRM_DEV_ERROR(dev, "no spdif reset control found\n");
		return PTR_ERR(dp->spdif_rst);
	}

	dp->dptx_rst = devm_reset_control_get(dev, "dptx");
	if (IS_ERR(dp->dptx_rst)) {
		DRM_DEV_ERROR(dev, "no uphy reset control found\n");
		return PTR_ERR(dp->dptx_rst);
	}

	dp->core_rst = devm_reset_control_get(dev, "core");
	if (IS_ERR(dp->core_rst)) {
		DRM_DEV_ERROR(dev, "no core reset control found\n");
		return PTR_ERR(dp->core_rst);
	}

	dp->apb_rst = devm_reset_control_get(dev, "apb");
	if (IS_ERR(dp->apb_rst)) {
		DRM_DEV_ERROR(dev, "no apb reset control found\n");
		return PTR_ERR(dp->apb_rst);
	}

	return 0;
}

static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
				  struct hdmi_codec_daifmt *daifmt,
				  struct hdmi_codec_params *params)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	struct audio_info audio = {
		.sample_width = params->sample_width,
		.sample_rate = params->sample_rate,
		.channels = params->channels,
	};
	int ret;

	mutex_lock(&dp->lock);
	if (!dp->active) {
		ret = -ENODEV;
		goto out;
	}

	switch (daifmt->fmt) {
	case HDMI_I2S:
		audio.format = AFMT_I2S;
		break;
	case HDMI_SPDIF:
		audio.format = AFMT_SPDIF;
		break;
	default:
		DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
		ret = -EINVAL;
		goto out;
	}

	ret = cdn_dp_audio_config(dp, &audio);
	if (!ret)
		dp->audio_info = audio;

out:
	mutex_unlock(&dp->lock);
	return ret;
}

static void cdn_dp_audio_shutdown(struct device *dev, void *data)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	int ret;

	mutex_lock(&dp->lock);
	if (!dp->active)
		goto out;

	ret = cdn_dp_audio_stop(dp, &dp->audio_info);
	if (!ret)
		dp->audio_info.format = AFMT_UNUSED;
out:
	mutex_unlock(&dp->lock);
}

static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
				     bool enable)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	int ret;

	mutex_lock(&dp->lock);
	if (!dp->active) {
		ret = -ENODEV;
		goto out;
	}

	ret = cdn_dp_audio_mute(dp, enable);

out:
	mutex_unlock(&dp->lock);
	return ret;
}

static int cdn_dp_audio_get_eld(struct device *dev, void *data,
				u8 *buf, size_t len)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);

	memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));

	return 0;
}

static const struct hdmi_codec_ops audio_codec_ops = {
	.hw_params = cdn_dp_audio_hw_params,
	.audio_shutdown = cdn_dp_audio_shutdown,
	.digital_mute = cdn_dp_audio_digital_mute,
	.get_eld = cdn_dp_audio_get_eld,
};

static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
				   struct device *dev)
{
	struct hdmi_codec_pdata codec_data = {
		.i2s = 1,
		.spdif = 1,
		.ops = &audio_codec_ops,
		.max_i2s_channels = 8,
	};

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

	return PTR_ERR_OR_ZERO(dp->audio_pdev);
}

static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
{
	int ret;
	unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
	unsigned long sleep = 1000;

	WARN_ON(!mutex_is_locked(&dp->lock));

	if (dp->fw_loaded)
		return 0;

	/* Drop the lock before getting the firmware to avoid blocking boot */
	mutex_unlock(&dp->lock);

	while (time_before(jiffies, timeout)) {
		ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
		if (ret == -ENOENT) {
			msleep(sleep);
			sleep *= 2;
			continue;
		} else if (ret) {
			DRM_DEV_ERROR(dp->dev,
				      "failed to request firmware: %d\n", ret);
			goto out;
		}

		dp->fw_loaded = true;
		ret = 0;
		goto out;
	}

	DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
	ret = -ETIMEDOUT;
out:
	mutex_lock(&dp->lock);
	return ret;
}

static void cdn_dp_pd_event_work(struct work_struct *work)
{
	struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
						event_work);
	struct drm_connector *connector = &dp->connector;
	enum drm_connector_status old_status;

	int ret;

	mutex_lock(&dp->lock);

	if (dp->suspended)
		goto out;

	ret = cdn_dp_request_firmware(dp);
	if (ret)
		goto out;

	dp->connected = true;

	/* Not connected, notify userspace to disable the block */
	if (!cdn_dp_connected_port(dp)) {
		DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
		dp->connected = false;

	/* Connected but not enabled, enable the block */
	} else if (!dp->active) {
		DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
		ret = cdn_dp_enable(dp);
		if (ret) {
			DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
			dp->connected = false;
		}

	/* Enabled and connected to a dongle without a sink, notify userspace */
	} else if (!cdn_dp_check_sink_connection(dp)) {
		DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
		dp->connected = false;

	/* Enabled and connected with a sink, re-train if requested */
	} else if (!cdn_dp_check_link_status(dp)) {
		unsigned int rate = dp->link.rate;
		unsigned int lanes = dp->link.num_lanes;
		struct drm_display_mode *mode = &dp->mode;

		DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
		ret = cdn_dp_train_link(dp);
		if (ret) {
			dp->connected = false;
			DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
			goto out;
		}

		/* If training result is changed, update the video config */
		if (mode->clock &&
		    (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
			ret = cdn_dp_config_video(dp);
			if (ret) {
				dp->connected = false;
				DRM_DEV_ERROR(dp->dev,
					      "Failed to config video %d\n",
					      ret);
			}
		}
	}

out:
	mutex_unlock(&dp->lock);

	old_status = connector->status;
	connector->status = connector->funcs->detect(connector, false);
	if (old_status != connector->status)
		drm_kms_helper_hotplug_event(dp->drm_dev);
}

static int cdn_dp_pd_event(struct notifier_block *nb,
			   unsigned long event, void *priv)
{
	struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
						event_nb);
	struct cdn_dp_device *dp = port->dp;

	/*
	 * It would be nice to be able to just do the work inline right here.
	 * However, we need to make a bunch of calls that might sleep in order
	 * to turn on the block/phy, so use a worker instead.
	 */
	schedule_work(&dp->event_work);

	return NOTIFY_DONE;
}

static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	struct drm_encoder *encoder;
	struct drm_connector *connector;
	struct cdn_dp_port *port;
	struct drm_device *drm_dev = data;
	int ret, i;

	ret = cdn_dp_parse_dt(dp);
	if (ret < 0)
		return ret;

	dp->drm_dev = drm_dev;
	dp->connected = false;
	dp->active = false;
	dp->active_port = -1;
	dp->fw_loaded = false;

	INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);

	encoder = &dp->encoder;

	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
							     dev->of_node);
	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);

	ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
			       DRM_MODE_ENCODER_TMDS, NULL);
	if (ret) {
		DRM_ERROR("failed to initialize encoder with drm\n");
		return ret;
	}

	drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);

	connector = &dp->connector;
	connector->polled = DRM_CONNECTOR_POLL_HPD;
	connector->dpms = DRM_MODE_DPMS_OFF;

	ret = drm_connector_init(drm_dev, connector,
				 &cdn_dp_atomic_connector_funcs,
				 DRM_MODE_CONNECTOR_DisplayPort);
	if (ret) {
		DRM_ERROR("failed to initialize connector with drm\n");
		goto err_free_encoder;
	}

	drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);

	ret = drm_connector_attach_encoder(connector, encoder);
	if (ret) {
		DRM_ERROR("failed to attach connector and encoder\n");
		goto err_free_connector;
	}

	for (i = 0; i < dp->ports; i++) {
		port = dp->port[i];

		port->event_nb.notifier_call = cdn_dp_pd_event;
		ret = devm_extcon_register_notifier(dp->dev, port->extcon,
						    EXTCON_DISP_DP,
						    &port->event_nb);
		if (ret) {
			DRM_DEV_ERROR(dev,
				      "register EXTCON_DISP_DP notifier err\n");
			goto err_free_connector;
		}
	}

	pm_runtime_enable(dev);

	schedule_work(&dp->event_work);

	return 0;

err_free_connector:
	drm_connector_cleanup(connector);
err_free_encoder:
	drm_encoder_cleanup(encoder);
	return ret;
}

static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	struct drm_encoder *encoder = &dp->encoder;
	struct drm_connector *connector = &dp->connector;

	cancel_work_sync(&dp->event_work);
	cdn_dp_encoder_disable(encoder);
	encoder->funcs->destroy(encoder);
	connector->funcs->destroy(connector);

	pm_runtime_disable(dev);
	if (dp->fw_loaded)
		release_firmware(dp->fw);
	kfree(dp->edid);
	dp->edid = NULL;
}

static const struct component_ops cdn_dp_component_ops = {
	.bind = cdn_dp_bind,
	.unbind = cdn_dp_unbind,
};

int cdn_dp_suspend(struct device *dev)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);
	int ret = 0;

	mutex_lock(&dp->lock);
	if (dp->active)
		ret = cdn_dp_disable(dp);
	dp->suspended = true;
	mutex_unlock(&dp->lock);

	return ret;
}

int cdn_dp_resume(struct device *dev)
{
	struct cdn_dp_device *dp = dev_get_drvdata(dev);

	mutex_lock(&dp->lock);
	dp->suspended = false;
	if (dp->fw_loaded)
		schedule_work(&dp->event_work);
	mutex_unlock(&dp->lock);

	return 0;
}

static int cdn_dp_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *match;
	struct cdn_dp_data *dp_data;
	struct cdn_dp_port *port;
	struct cdn_dp_device *dp;
	struct extcon_dev *extcon;
	struct phy *phy;
	int i;

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

	match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
	dp_data = (struct cdn_dp_data *)match->data;

	for (i = 0; i < dp_data->max_phy; i++) {
		extcon = extcon_get_edev_by_phandle(dev, i);
		phy = devm_of_phy_get_by_index(dev, dev->of_node, i);

		if (PTR_ERR(extcon) == -EPROBE_DEFER ||
		    PTR_ERR(phy) == -EPROBE_DEFER)
			return -EPROBE_DEFER;

		if (IS_ERR(extcon) || IS_ERR(phy))
			continue;

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

		port->extcon = extcon;
		port->phy = phy;
		port->dp = dp;
		port->id = i;
		dp->port[dp->ports++] = port;
	}

	if (!dp->ports) {
		DRM_DEV_ERROR(dev, "missing extcon or phy\n");
		return -EINVAL;
	}

	mutex_init(&dp->lock);
	dev_set_drvdata(dev, dp);

	cdn_dp_audio_codec_init(dp, dev);

	return component_add(dev, &cdn_dp_component_ops);
}

static int cdn_dp_remove(struct platform_device *pdev)
{
	struct cdn_dp_device *dp = platform_get_drvdata(pdev);

	platform_device_unregister(dp->audio_pdev);
	cdn_dp_suspend(dp->dev);
	component_del(&pdev->dev, &cdn_dp_component_ops);

	return 0;
}

static void cdn_dp_shutdown(struct platform_device *pdev)
{
	struct cdn_dp_device *dp = platform_get_drvdata(pdev);

	cdn_dp_suspend(dp->dev);
}

static const struct dev_pm_ops cdn_dp_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
				cdn_dp_resume)
};

struct platform_driver cdn_dp_driver = {
	.probe = cdn_dp_probe,
	.remove = cdn_dp_remove,
	.shutdown = cdn_dp_shutdown,
	.driver = {
		   .name = "cdn-dp",
		   .owner = THIS_MODULE,
		   .of_match_table = of_match_ptr(cdn_dp_dt_ids),
		   .pm = &cdn_dp_pm_ops,
	},
};