summaryrefslogtreecommitdiff
path: root/include/drm/drm_dp_helper.h
blob: 63b8bd50244479a4cebe0d9ddf766fca375a7bcf (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
/*
 * Copyright © 2008 Keith Packard
 *
 * 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.
 */

#ifndef _DRM_DP_HELPER_H_
#define _DRM_DP_HELPER_H_

#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/delay.h>

/*
 * Unless otherwise noted, all values are from the DP 1.1a spec.  Note that
 * DP and DPCD versions are independent.  Differences from 1.0 are not noted,
 * 1.0 devices basically don't exist in the wild.
 *
 * Abbreviations, in chronological order:
 *
 * eDP: Embedded DisplayPort version 1
 * DPI: DisplayPort Interoperability Guideline v1.1a
 * 1.2: DisplayPort 1.2
 * MST: Multistream Transport - part of DP 1.2a
 *
 * 1.2 formally includes both eDP and DPI definitions.
 */

#define DP_AUX_MAX_PAYLOAD_BYTES	16

#define DP_AUX_I2C_WRITE		0x0
#define DP_AUX_I2C_READ			0x1
#define DP_AUX_I2C_WRITE_STATUS_UPDATE	0x2
#define DP_AUX_I2C_MOT			0x4
#define DP_AUX_NATIVE_WRITE		0x8
#define DP_AUX_NATIVE_READ		0x9

#define DP_AUX_NATIVE_REPLY_ACK		(0x0 << 0)
#define DP_AUX_NATIVE_REPLY_NACK	(0x1 << 0)
#define DP_AUX_NATIVE_REPLY_DEFER	(0x2 << 0)
#define DP_AUX_NATIVE_REPLY_MASK	(0x3 << 0)

#define DP_AUX_I2C_REPLY_ACK		(0x0 << 2)
#define DP_AUX_I2C_REPLY_NACK		(0x1 << 2)
#define DP_AUX_I2C_REPLY_DEFER		(0x2 << 2)
#define DP_AUX_I2C_REPLY_MASK		(0x3 << 2)

/* AUX CH addresses */
/* DPCD */
#define DP_DPCD_REV                         0x000

#define DP_MAX_LINK_RATE                    0x001

#define DP_MAX_LANE_COUNT                   0x002
# define DP_MAX_LANE_COUNT_MASK		    0x1f
# define DP_TPS3_SUPPORTED		    (1 << 6) /* 1.2 */
# define DP_ENHANCED_FRAME_CAP		    (1 << 7)

#define DP_MAX_DOWNSPREAD                   0x003
# define DP_MAX_DOWNSPREAD_0_5		    (1 << 0)
# define DP_NO_AUX_HANDSHAKE_LINK_TRAINING  (1 << 6)

#define DP_NORP                             0x004

#define DP_DOWNSTREAMPORT_PRESENT           0x005
# define DP_DWN_STRM_PORT_PRESENT           (1 << 0)
# define DP_DWN_STRM_PORT_TYPE_MASK         0x06
# define DP_DWN_STRM_PORT_TYPE_DP           (0 << 1)
# define DP_DWN_STRM_PORT_TYPE_ANALOG       (1 << 1)
# define DP_DWN_STRM_PORT_TYPE_TMDS         (2 << 1)
# define DP_DWN_STRM_PORT_TYPE_OTHER        (3 << 1)
# define DP_FORMAT_CONVERSION               (1 << 3)
# define DP_DETAILED_CAP_INFO_AVAILABLE	    (1 << 4) /* DPI */

#define DP_MAIN_LINK_CHANNEL_CODING         0x006

#define DP_DOWN_STREAM_PORT_COUNT	    0x007
# define DP_PORT_COUNT_MASK		    0x0f
# define DP_MSA_TIMING_PAR_IGNORED	    (1 << 6) /* eDP */
# define DP_OUI_SUPPORT			    (1 << 7)

#define DP_RECEIVE_PORT_0_CAP_0		    0x008
# define DP_LOCAL_EDID_PRESENT		    (1 << 1)
# define DP_ASSOCIATED_TO_PRECEDING_PORT    (1 << 2)

#define DP_RECEIVE_PORT_0_BUFFER_SIZE	    0x009

#define DP_RECEIVE_PORT_1_CAP_0		    0x00a
#define DP_RECEIVE_PORT_1_BUFFER_SIZE       0x00b

#define DP_I2C_SPEED_CAP		    0x00c    /* DPI */
# define DP_I2C_SPEED_1K		    0x01
# define DP_I2C_SPEED_5K		    0x02
# define DP_I2C_SPEED_10K		    0x04
# define DP_I2C_SPEED_100K		    0x08
# define DP_I2C_SPEED_400K		    0x10
# define DP_I2C_SPEED_1M		    0x20

#define DP_EDP_CONFIGURATION_CAP            0x00d   /* XXX 1.2? */
# define DP_ALTERNATE_SCRAMBLER_RESET_CAP   (1 << 0)
# define DP_FRAMING_CHANGE_CAP		    (1 << 1)
# define DP_DPCD_DISPLAY_CONTROL_CAPABLE     (1 << 3) /* edp v1.2 or higher */

#define DP_TRAINING_AUX_RD_INTERVAL         0x00e   /* XXX 1.2? */

#define DP_ADAPTER_CAP			    0x00f   /* 1.2 */
# define DP_FORCE_LOAD_SENSE_CAP	    (1 << 0)
# define DP_ALTERNATE_I2C_PATTERN_CAP	    (1 << 1)

#define DP_SUPPORTED_LINK_RATES		    0x010 /* eDP 1.4 */
# define DP_MAX_SUPPORTED_RATES		     8	    /* 16-bit little-endian */

/* Multiple stream transport */
#define DP_FAUX_CAP			    0x020   /* 1.2 */
# define DP_FAUX_CAP_1			    (1 << 0)

#define DP_MSTM_CAP			    0x021   /* 1.2 */
# define DP_MST_CAP			    (1 << 0)

#define DP_NUMBER_OF_AUDIO_ENDPOINTS	    0x022   /* 1.2 */

/* AV_SYNC_DATA_BLOCK                                  1.2 */
#define DP_AV_GRANULARITY		    0x023
# define DP_AG_FACTOR_MASK		    (0xf << 0)
# define DP_AG_FACTOR_3MS		    (0 << 0)
# define DP_AG_FACTOR_2MS		    (1 << 0)
# define DP_AG_FACTOR_1MS		    (2 << 0)
# define DP_AG_FACTOR_500US		    (3 << 0)
# define DP_AG_FACTOR_200US		    (4 << 0)
# define DP_AG_FACTOR_100US		    (5 << 0)
# define DP_AG_FACTOR_10US		    (6 << 0)
# define DP_AG_FACTOR_1US		    (7 << 0)
# define DP_VG_FACTOR_MASK		    (0xf << 4)
# define DP_VG_FACTOR_3MS		    (0 << 4)
# define DP_VG_FACTOR_2MS		    (1 << 4)
# define DP_VG_FACTOR_1MS		    (2 << 4)
# define DP_VG_FACTOR_500US		    (3 << 4)
# define DP_VG_FACTOR_200US		    (4 << 4)
# define DP_VG_FACTOR_100US		    (5 << 4)

#define DP_AUD_DEC_LAT0			    0x024
#define DP_AUD_DEC_LAT1			    0x025

#define DP_AUD_PP_LAT0			    0x026
#define DP_AUD_PP_LAT1			    0x027

#define DP_VID_INTER_LAT		    0x028

#define DP_VID_PROG_LAT			    0x029

#define DP_REP_LAT			    0x02a

#define DP_AUD_DEL_INS0			    0x02b
#define DP_AUD_DEL_INS1			    0x02c
#define DP_AUD_DEL_INS2			    0x02d
/* End of AV_SYNC_DATA_BLOCK */

#define DP_RECEIVER_ALPM_CAP		    0x02e   /* eDP 1.4 */
# define DP_ALPM_CAP			    (1 << 0)

#define DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP   0x02f   /* eDP 1.4 */
# define DP_AUX_FRAME_SYNC_CAP		    (1 << 0)

#define DP_GUID				    0x030   /* 1.2 */

#define DP_PSR_SUPPORT                      0x070   /* XXX 1.2? */
# define DP_PSR_IS_SUPPORTED                1
# define DP_PSR2_IS_SUPPORTED		    2	    /* eDP 1.4 */

#define DP_PSR_CAPS                         0x071   /* XXX 1.2? */
# define DP_PSR_NO_TRAIN_ON_EXIT            1
# define DP_PSR_SETUP_TIME_330              (0 << 1)
# define DP_PSR_SETUP_TIME_275              (1 << 1)
# define DP_PSR_SETUP_TIME_220              (2 << 1)
# define DP_PSR_SETUP_TIME_165              (3 << 1)
# define DP_PSR_SETUP_TIME_110              (4 << 1)
# define DP_PSR_SETUP_TIME_55               (5 << 1)
# define DP_PSR_SETUP_TIME_0                (6 << 1)
# define DP_PSR_SETUP_TIME_MASK             (7 << 1)
# define DP_PSR_SETUP_TIME_SHIFT            1

/*
 * 0x80-0x8f describe downstream port capabilities, but there are two layouts
 * based on whether DP_DETAILED_CAP_INFO_AVAILABLE was set.  If it was not,
 * each port's descriptor is one byte wide.  If it was set, each port's is
 * four bytes wide, starting with the one byte from the base info.  As of
 * DP interop v1.1a only VGA defines additional detail.
 */

/* offset 0 */
#define DP_DOWNSTREAM_PORT_0		    0x80
# define DP_DS_PORT_TYPE_MASK		    (7 << 0)
# define DP_DS_PORT_TYPE_DP		    0
# define DP_DS_PORT_TYPE_VGA		    1
# define DP_DS_PORT_TYPE_DVI		    2
# define DP_DS_PORT_TYPE_HDMI		    3
# define DP_DS_PORT_TYPE_NON_EDID	    4
# define DP_DS_PORT_HPD			    (1 << 3)
/* offset 1 for VGA is maximum megapixels per second / 8 */
/* offset 2 */
# define DP_DS_VGA_MAX_BPC_MASK		    (3 << 0)
# define DP_DS_VGA_8BPC			    0
# define DP_DS_VGA_10BPC		    1
# define DP_DS_VGA_12BPC		    2
# define DP_DS_VGA_16BPC		    3

/* link configuration */
#define	DP_LINK_BW_SET		            0x100
# define DP_LINK_RATE_TABLE		    0x00    /* eDP 1.4 */
# define DP_LINK_BW_1_62		    0x06
# define DP_LINK_BW_2_7			    0x0a
# define DP_LINK_BW_5_4			    0x14    /* 1.2 */

#define DP_LANE_COUNT_SET	            0x101
# define DP_LANE_COUNT_MASK		    0x0f
# define DP_LANE_COUNT_ENHANCED_FRAME_EN    (1 << 7)

#define DP_TRAINING_PATTERN_SET	            0x102
# define DP_TRAINING_PATTERN_DISABLE	    0
# define DP_TRAINING_PATTERN_1		    1
# define DP_TRAINING_PATTERN_2		    2
# define DP_TRAINING_PATTERN_3		    3	    /* 1.2 */
# define DP_TRAINING_PATTERN_MASK	    0x3

/* DPCD 1.1 only. For DPCD >= 1.2 see per-lane DP_LINK_QUAL_LANEn_SET */
# define DP_LINK_QUAL_PATTERN_11_DISABLE    (0 << 2)
# define DP_LINK_QUAL_PATTERN_11_D10_2	    (1 << 2)
# define DP_LINK_QUAL_PATTERN_11_ERROR_RATE (2 << 2)
# define DP_LINK_QUAL_PATTERN_11_PRBS7	    (3 << 2)
# define DP_LINK_QUAL_PATTERN_11_MASK	    (3 << 2)

# define DP_RECOVERED_CLOCK_OUT_EN	    (1 << 4)
# define DP_LINK_SCRAMBLING_DISABLE	    (1 << 5)

# define DP_SYMBOL_ERROR_COUNT_BOTH	    (0 << 6)
# define DP_SYMBOL_ERROR_COUNT_DISPARITY    (1 << 6)
# define DP_SYMBOL_ERROR_COUNT_SYMBOL	    (2 << 6)
# define DP_SYMBOL_ERROR_COUNT_MASK	    (3 << 6)

#define DP_TRAINING_LANE0_SET		    0x103
#define DP_TRAINING_LANE1_SET		    0x104
#define DP_TRAINING_LANE2_SET		    0x105
#define DP_TRAINING_LANE3_SET		    0x106

# define DP_TRAIN_VOLTAGE_SWING_MASK	    0x3
# define DP_TRAIN_VOLTAGE_SWING_SHIFT	    0
# define DP_TRAIN_MAX_SWING_REACHED	    (1 << 2)
# define DP_TRAIN_VOLTAGE_SWING_LEVEL_0 (0 << 0)
# define DP_TRAIN_VOLTAGE_SWING_LEVEL_1 (1 << 0)
# define DP_TRAIN_VOLTAGE_SWING_LEVEL_2 (2 << 0)
# define DP_TRAIN_VOLTAGE_SWING_LEVEL_3 (3 << 0)

# define DP_TRAIN_PRE_EMPHASIS_MASK	    (3 << 3)
# define DP_TRAIN_PRE_EMPH_LEVEL_0		(0 << 3)
# define DP_TRAIN_PRE_EMPH_LEVEL_1		(1 << 3)
# define DP_TRAIN_PRE_EMPH_LEVEL_2		(2 << 3)
# define DP_TRAIN_PRE_EMPH_LEVEL_3		(3 << 3)

# define DP_TRAIN_PRE_EMPHASIS_SHIFT	    3
# define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED  (1 << 5)

#define DP_DOWNSPREAD_CTRL		    0x107
# define DP_SPREAD_AMP_0_5		    (1 << 4)
# define DP_MSA_TIMING_PAR_IGNORE_EN	    (1 << 7) /* eDP */

#define DP_MAIN_LINK_CHANNEL_CODING_SET	    0x108
# define DP_SET_ANSI_8B10B		    (1 << 0)

#define DP_I2C_SPEED_CONTROL_STATUS	    0x109   /* DPI */
/* bitmask as for DP_I2C_SPEED_CAP */

#define DP_EDP_CONFIGURATION_SET            0x10a   /* XXX 1.2? */
# define DP_ALTERNATE_SCRAMBLER_RESET_ENABLE (1 << 0)
# define DP_FRAMING_CHANGE_ENABLE	    (1 << 1)
# define DP_PANEL_SELF_TEST_ENABLE	    (1 << 7)

#define DP_LINK_QUAL_LANE0_SET		    0x10b   /* DPCD >= 1.2 */
#define DP_LINK_QUAL_LANE1_SET		    0x10c
#define DP_LINK_QUAL_LANE2_SET		    0x10d
#define DP_LINK_QUAL_LANE3_SET		    0x10e
# define DP_LINK_QUAL_PATTERN_DISABLE	    0
# define DP_LINK_QUAL_PATTERN_D10_2	    1
# define DP_LINK_QUAL_PATTERN_ERROR_RATE    2
# define DP_LINK_QUAL_PATTERN_PRBS7	    3
# define DP_LINK_QUAL_PATTERN_80BIT_CUSTOM  4
# define DP_LINK_QUAL_PATTERN_HBR2_EYE      5
# define DP_LINK_QUAL_PATTERN_MASK	    7

#define DP_TRAINING_LANE0_1_SET2	    0x10f
#define DP_TRAINING_LANE2_3_SET2	    0x110
# define DP_LANE02_POST_CURSOR2_SET_MASK    (3 << 0)
# define DP_LANE02_MAX_POST_CURSOR2_REACHED (1 << 2)
# define DP_LANE13_POST_CURSOR2_SET_MASK    (3 << 4)
# define DP_LANE13_MAX_POST_CURSOR2_REACHED (1 << 6)

#define DP_MSTM_CTRL			    0x111   /* 1.2 */
# define DP_MST_EN			    (1 << 0)
# define DP_UP_REQ_EN			    (1 << 1)
# define DP_UPSTREAM_IS_SRC		    (1 << 2)

#define DP_AUDIO_DELAY0			    0x112   /* 1.2 */
#define DP_AUDIO_DELAY1			    0x113
#define DP_AUDIO_DELAY2			    0x114

#define DP_LINK_RATE_SET		    0x115   /* eDP 1.4 */
# define DP_LINK_RATE_SET_SHIFT		    0
# define DP_LINK_RATE_SET_MASK		    (7 << 0)

#define DP_RECEIVER_ALPM_CONFIG		    0x116   /* eDP 1.4 */
# define DP_ALPM_ENABLE			    (1 << 0)
# define DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE  (1 << 1)

#define DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF  0x117   /* eDP 1.4 */
# define DP_AUX_FRAME_SYNC_ENABLE	    (1 << 0)
# define DP_IRQ_HPD_ENABLE		    (1 << 1)

#define DP_UPSTREAM_DEVICE_DP_PWR_NEED	    0x118   /* 1.2 */
# define DP_PWR_NOT_NEEDED		    (1 << 0)

#define DP_AUX_FRAME_SYNC_VALUE		    0x15c   /* eDP 1.4 */
# define DP_AUX_FRAME_SYNC_VALID	    (1 << 0)

#define DP_PSR_EN_CFG			    0x170   /* XXX 1.2? */
# define DP_PSR_ENABLE			    (1 << 0)
# define DP_PSR_MAIN_LINK_ACTIVE	    (1 << 1)
# define DP_PSR_CRC_VERIFICATION	    (1 << 2)
# define DP_PSR_FRAME_CAPTURE		    (1 << 3)
# define DP_PSR_SELECTIVE_UPDATE	    (1 << 4)
# define DP_PSR_IRQ_HPD_WITH_CRC_ERRORS     (1 << 5)

#define DP_ADAPTER_CTRL			    0x1a0
# define DP_ADAPTER_CTRL_FORCE_LOAD_SENSE   (1 << 0)

#define DP_BRANCH_DEVICE_CTRL		    0x1a1
# define DP_BRANCH_DEVICE_IRQ_HPD	    (1 << 0)

#define DP_PAYLOAD_ALLOCATE_SET		    0x1c0
#define DP_PAYLOAD_ALLOCATE_START_TIME_SLOT 0x1c1
#define DP_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT 0x1c2

#define DP_SINK_COUNT			    0x200
/* prior to 1.2 bit 7 was reserved mbz */
# define DP_GET_SINK_COUNT(x)		    ((((x) & 0x80) >> 1) | ((x) & 0x3f))
# define DP_SINK_CP_READY		    (1 << 6)

#define DP_DEVICE_SERVICE_IRQ_VECTOR	    0x201
# define DP_REMOTE_CONTROL_COMMAND_PENDING  (1 << 0)
# define DP_AUTOMATED_TEST_REQUEST	    (1 << 1)
# define DP_CP_IRQ			    (1 << 2)
# define DP_MCCS_IRQ			    (1 << 3)
# define DP_DOWN_REP_MSG_RDY		    (1 << 4) /* 1.2 MST */
# define DP_UP_REQ_MSG_RDY		    (1 << 5) /* 1.2 MST */
# define DP_SINK_SPECIFIC_IRQ		    (1 << 6)

#define DP_LANE0_1_STATUS		    0x202
#define DP_LANE2_3_STATUS		    0x203
# define DP_LANE_CR_DONE		    (1 << 0)
# define DP_LANE_CHANNEL_EQ_DONE	    (1 << 1)
# define DP_LANE_SYMBOL_LOCKED		    (1 << 2)

#define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE |		\
			    DP_LANE_CHANNEL_EQ_DONE |	\
			    DP_LANE_SYMBOL_LOCKED)

#define DP_LANE_ALIGN_STATUS_UPDATED	    0x204

#define DP_INTERLANE_ALIGN_DONE		    (1 << 0)
#define DP_DOWNSTREAM_PORT_STATUS_CHANGED   (1 << 6)
#define DP_LINK_STATUS_UPDATED		    (1 << 7)

#define DP_SINK_STATUS			    0x205

#define DP_RECEIVE_PORT_0_STATUS	    (1 << 0)
#define DP_RECEIVE_PORT_1_STATUS	    (1 << 1)

#define DP_ADJUST_REQUEST_LANE0_1	    0x206
#define DP_ADJUST_REQUEST_LANE2_3	    0x207
# define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK  0x03
# define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0
# define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK   0x0c
# define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT  2
# define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK  0x30
# define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4
# define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK   0xc0
# define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT  6

#define DP_TEST_REQUEST			    0x218
# define DP_TEST_LINK_TRAINING		    (1 << 0)
# define DP_TEST_LINK_VIDEO_PATTERN	    (1 << 1)
# define DP_TEST_LINK_EDID_READ		    (1 << 2)
# define DP_TEST_LINK_PHY_TEST_PATTERN	    (1 << 3) /* DPCD >= 1.1 */
# define DP_TEST_LINK_FAUX_PATTERN	    (1 << 4) /* DPCD >= 1.2 */

#define DP_TEST_LINK_RATE		    0x219
# define DP_LINK_RATE_162		    (0x6)
# define DP_LINK_RATE_27		    (0xa)

#define DP_TEST_LANE_COUNT		    0x220

#define DP_TEST_PATTERN			    0x221

#define DP_TEST_CRC_R_CR		    0x240
#define DP_TEST_CRC_G_Y			    0x242
#define DP_TEST_CRC_B_CB		    0x244

#define DP_TEST_SINK_MISC		    0x246
# define DP_TEST_CRC_SUPPORTED		    (1 << 5)
# define DP_TEST_COUNT_MASK		    0xf

#define DP_TEST_RESPONSE		    0x260
# define DP_TEST_ACK			    (1 << 0)
# define DP_TEST_NAK			    (1 << 1)
# define DP_TEST_EDID_CHECKSUM_WRITE	    (1 << 2)

#define DP_TEST_EDID_CHECKSUM		    0x261

#define DP_TEST_SINK			    0x270
# define DP_TEST_SINK_START		    (1 << 0)

#define DP_PAYLOAD_TABLE_UPDATE_STATUS      0x2c0   /* 1.2 MST */
# define DP_PAYLOAD_TABLE_UPDATED           (1 << 0)
# define DP_PAYLOAD_ACT_HANDLED             (1 << 1)

#define DP_VC_PAYLOAD_ID_SLOT_1             0x2c1   /* 1.2 MST */
/* up to ID_SLOT_63 at 0x2ff */

#define DP_SOURCE_OUI			    0x300
#define DP_SINK_OUI			    0x400
#define DP_BRANCH_OUI			    0x500

#define DP_SET_POWER                        0x600
# define DP_SET_POWER_D0                    0x1
# define DP_SET_POWER_D3                    0x2
# define DP_SET_POWER_MASK                  0x3

#define DP_EDP_DPCD_REV			    0x700    /* eDP 1.2 */
# define DP_EDP_11			    0x00
# define DP_EDP_12			    0x01
# define DP_EDP_13			    0x02
# define DP_EDP_14			    0x03

#define DP_EDP_GENERAL_CAP_1		    0x701
# define DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP		(1 << 0)
# define DP_EDP_BACKLIGHT_PIN_ENABLE_CAP		(1 << 1)
# define DP_EDP_BACKLIGHT_AUX_ENABLE_CAP		(1 << 2)
# define DP_EDP_PANEL_SELF_TEST_PIN_ENABLE_CAP		(1 << 3)
# define DP_EDP_PANEL_SELF_TEST_AUX_ENABLE_CAP		(1 << 4)
# define DP_EDP_FRC_ENABLE_CAP				(1 << 5)
# define DP_EDP_COLOR_ENGINE_CAP			(1 << 6)
# define DP_EDP_SET_POWER_CAP				(1 << 7)

#define DP_EDP_BACKLIGHT_ADJUSTMENT_CAP     0x702
# define DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP	(1 << 0)
# define DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP	(1 << 1)
# define DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT		(1 << 2)
# define DP_EDP_BACKLIGHT_AUX_PWM_PRODUCT_CAP		(1 << 3)
# define DP_EDP_BACKLIGHT_FREQ_PWM_PIN_PASSTHRU_CAP	(1 << 4)
# define DP_EDP_BACKLIGHT_FREQ_AUX_SET_CAP		(1 << 5)
# define DP_EDP_DYNAMIC_BACKLIGHT_CAP			(1 << 6)
# define DP_EDP_VBLANK_BACKLIGHT_UPDATE_CAP		(1 << 7)

#define DP_EDP_GENERAL_CAP_2		    0x703
# define DP_EDP_OVERDRIVE_ENGINE_ENABLED		(1 << 0)

#define DP_EDP_GENERAL_CAP_3		    0x704    /* eDP 1.4 */
# define DP_EDP_X_REGION_CAP_MASK			(0xf << 0)
# define DP_EDP_X_REGION_CAP_SHIFT			0
# define DP_EDP_Y_REGION_CAP_MASK			(0xf << 4)
# define DP_EDP_Y_REGION_CAP_SHIFT			4

#define DP_EDP_DISPLAY_CONTROL_REGISTER     0x720
# define DP_EDP_BACKLIGHT_ENABLE			(1 << 0)
# define DP_EDP_BLACK_VIDEO_ENABLE			(1 << 1)
# define DP_EDP_FRC_ENABLE				(1 << 2)
# define DP_EDP_COLOR_ENGINE_ENABLE			(1 << 3)
# define DP_EDP_VBLANK_BACKLIGHT_UPDATE_ENABLE		(1 << 7)

#define DP_EDP_BACKLIGHT_MODE_SET_REGISTER  0x721
# define DP_EDP_BACKLIGHT_CONTROL_MODE_MASK		(3 << 0)
# define DP_EDP_BACKLIGHT_CONTROL_MODE_PWM		(0 << 0)
# define DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET		(1 << 0)
# define DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD		(2 << 0)
# define DP_EDP_BACKLIGHT_CONTROL_MODE_PRODUCT		(3 << 0)
# define DP_EDP_BACKLIGHT_FREQ_PWM_PIN_PASSTHRU_ENABLE	(1 << 2)
# define DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE		(1 << 3)
# define DP_EDP_DYNAMIC_BACKLIGHT_ENABLE		(1 << 4)
# define DP_EDP_REGIONAL_BACKLIGHT_ENABLE		(1 << 5)
# define DP_EDP_UPDATE_REGION_BRIGHTNESS		(1 << 6) /* eDP 1.4 */

#define DP_EDP_BACKLIGHT_BRIGHTNESS_MSB     0x722
#define DP_EDP_BACKLIGHT_BRIGHTNESS_LSB     0x723

#define DP_EDP_PWMGEN_BIT_COUNT             0x724
#define DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN     0x725
#define DP_EDP_PWMGEN_BIT_COUNT_CAP_MAX     0x726

#define DP_EDP_BACKLIGHT_CONTROL_STATUS     0x727

#define DP_EDP_BACKLIGHT_FREQ_SET           0x728

#define DP_EDP_BACKLIGHT_FREQ_CAP_MIN_MSB   0x72a
#define DP_EDP_BACKLIGHT_FREQ_CAP_MIN_MID   0x72b
#define DP_EDP_BACKLIGHT_FREQ_CAP_MIN_LSB   0x72c

#define DP_EDP_BACKLIGHT_FREQ_CAP_MAX_MSB   0x72d
#define DP_EDP_BACKLIGHT_FREQ_CAP_MAX_MID   0x72e
#define DP_EDP_BACKLIGHT_FREQ_CAP_MAX_LSB   0x72f

#define DP_EDP_DBC_MINIMUM_BRIGHTNESS_SET   0x732
#define DP_EDP_DBC_MAXIMUM_BRIGHTNESS_SET   0x733

#define DP_EDP_REGIONAL_BACKLIGHT_BASE      0x740    /* eDP 1.4 */
#define DP_EDP_REGIONAL_BACKLIGHT_0	    0x741    /* eDP 1.4 */

#define DP_SIDEBAND_MSG_DOWN_REQ_BASE	    0x1000   /* 1.2 MST */
#define DP_SIDEBAND_MSG_UP_REP_BASE	    0x1200   /* 1.2 MST */
#define DP_SIDEBAND_MSG_DOWN_REP_BASE	    0x1400   /* 1.2 MST */
#define DP_SIDEBAND_MSG_UP_REQ_BASE	    0x1600   /* 1.2 MST */

#define DP_SINK_COUNT_ESI		    0x2002   /* 1.2 */
/* 0-5 sink count */
# define DP_SINK_COUNT_CP_READY             (1 << 6)

#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0   0x2003   /* 1.2 */

#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1   0x2004   /* 1.2 */

#define DP_LINK_SERVICE_IRQ_VECTOR_ESI0     0x2005   /* 1.2 */

#define DP_PSR_ERROR_STATUS                 0x2006  /* XXX 1.2? */
# define DP_PSR_LINK_CRC_ERROR              (1 << 0)
# define DP_PSR_RFB_STORAGE_ERROR           (1 << 1)
# define DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR (1 << 2) /* eDP 1.4 */

#define DP_PSR_ESI                          0x2007  /* XXX 1.2? */
# define DP_PSR_CAPS_CHANGE                 (1 << 0)

#define DP_PSR_STATUS                       0x2008  /* XXX 1.2? */
# define DP_PSR_SINK_INACTIVE               0
# define DP_PSR_SINK_ACTIVE_SRC_SYNCED      1
# define DP_PSR_SINK_ACTIVE_RFB             2
# define DP_PSR_SINK_ACTIVE_SINK_SYNCED     3
# define DP_PSR_SINK_ACTIVE_RESYNC          4
# define DP_PSR_SINK_INTERNAL_ERROR         7
# define DP_PSR_SINK_STATE_MASK             0x07

#define DP_RECEIVER_ALPM_STATUS		    0x200b  /* eDP 1.4 */
# define DP_ALPM_LOCK_TIMEOUT_ERROR	    (1 << 0)

/* DP 1.2 Sideband message defines */
/* peer device type - DP 1.2a Table 2-92 */
#define DP_PEER_DEVICE_NONE		0x0
#define DP_PEER_DEVICE_SOURCE_OR_SST	0x1
#define DP_PEER_DEVICE_MST_BRANCHING	0x2
#define DP_PEER_DEVICE_SST_SINK		0x3
#define DP_PEER_DEVICE_DP_LEGACY_CONV	0x4

/* DP 1.2 MST sideband request names DP 1.2a Table 2-80 */
#define DP_LINK_ADDRESS			0x01
#define DP_CONNECTION_STATUS_NOTIFY	0x02
#define DP_ENUM_PATH_RESOURCES		0x10
#define DP_ALLOCATE_PAYLOAD		0x11
#define DP_QUERY_PAYLOAD		0x12
#define DP_RESOURCE_STATUS_NOTIFY	0x13
#define DP_CLEAR_PAYLOAD_ID_TABLE	0x14
#define DP_REMOTE_DPCD_READ		0x20
#define DP_REMOTE_DPCD_WRITE		0x21
#define DP_REMOTE_I2C_READ		0x22
#define DP_REMOTE_I2C_WRITE		0x23
#define DP_POWER_UP_PHY			0x24
#define DP_POWER_DOWN_PHY		0x25
#define DP_SINK_EVENT_NOTIFY		0x30
#define DP_QUERY_STREAM_ENC_STATUS	0x38

/* DP 1.2 MST sideband nak reasons - table 2.84 */
#define DP_NAK_WRITE_FAILURE		0x01
#define DP_NAK_INVALID_READ		0x02
#define DP_NAK_CRC_FAILURE		0x03
#define DP_NAK_BAD_PARAM		0x04
#define DP_NAK_DEFER			0x05
#define DP_NAK_LINK_FAILURE		0x06
#define DP_NAK_NO_RESOURCES		0x07
#define DP_NAK_DPCD_FAIL		0x08
#define DP_NAK_I2C_NAK			0x09
#define DP_NAK_ALLOCATE_FAIL		0x0a

#define MODE_I2C_START	1
#define MODE_I2C_WRITE	2
#define MODE_I2C_READ	4
#define MODE_I2C_STOP	8

/* DP 1.2 MST PORTs - Section 2.5.1 v1.2a spec */
#define DP_MST_PHYSICAL_PORT_0 0
#define DP_MST_LOGICAL_PORT_0 8

#define DP_LINK_STATUS_SIZE	   6
bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
			  int lane_count);
bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
			      int lane_count);
u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
				     int lane);
u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],
					  int lane);

#define DP_BRANCH_OUI_HEADER_SIZE	0xc
#define DP_RECEIVER_CAP_SIZE		0xf
#define EDP_PSR_RECEIVER_CAP_SIZE	2
#define EDP_DISPLAY_CTL_CAP_SIZE	3

void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);

u8 drm_dp_link_rate_to_bw_code(int link_rate);
int drm_dp_bw_code_to_link_rate(u8 link_bw);

struct edp_sdp_header {
	u8 HB0; /* Secondary Data Packet ID */
	u8 HB1; /* Secondary Data Packet Type */
	u8 HB2; /* 7:5 reserved, 4:0 revision number */
	u8 HB3; /* 7:5 reserved, 4:0 number of valid data bytes */
} __packed;

#define EDP_SDP_HEADER_REVISION_MASK		0x1F
#define EDP_SDP_HEADER_VALID_PAYLOAD_BYTES	0x1F

struct edp_vsc_psr {
	struct edp_sdp_header sdp_header;
	u8 DB0; /* Stereo Interface */
	u8 DB1; /* 0 - PSR State; 1 - Update RFB; 2 - CRC Valid */
	u8 DB2; /* CRC value bits 7:0 of the R or Cr component */
	u8 DB3; /* CRC value bits 15:8 of the R or Cr component */
	u8 DB4; /* CRC value bits 7:0 of the G or Y component */
	u8 DB5; /* CRC value bits 15:8 of the G or Y component */
	u8 DB6; /* CRC value bits 7:0 of the B or Cb component */
	u8 DB7; /* CRC value bits 15:8 of the B or Cb component */
	u8 DB8_31[24]; /* Reserved */
} __packed;

#define EDP_VSC_PSR_STATE_ACTIVE	(1<<0)
#define EDP_VSC_PSR_UPDATE_RFB		(1<<1)
#define EDP_VSC_PSR_CRC_VALUES_VALID	(1<<2)

int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]);

static inline int
drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
	return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
}

static inline u8
drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
	return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
}

static inline bool
drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
	return dpcd[DP_DPCD_REV] >= 0x11 &&
		(dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);
}

static inline bool
drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
	return dpcd[DP_DPCD_REV] >= 0x12 &&
		dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
}

/*
 * DisplayPort AUX channel
 */

/**
 * struct drm_dp_aux_msg - DisplayPort AUX channel transaction
 * @address: address of the (first) register to access
 * @request: contains the type of transaction (see DP_AUX_* macros)
 * @reply: upon completion, contains the reply type of the transaction
 * @buffer: pointer to a transmission or reception buffer
 * @size: size of @buffer
 */
struct drm_dp_aux_msg {
	unsigned int address;
	u8 request;
	u8 reply;
	void *buffer;
	size_t size;
};

/**
 * struct drm_dp_aux - DisplayPort AUX channel
 * @name: user-visible name of this AUX channel and the I2C-over-AUX adapter
 * @ddc: I2C adapter that can be used for I2C-over-AUX communication
 * @dev: pointer to struct device that is the parent for this AUX channel
 * @hw_mutex: internal mutex used for locking transfers
 * @transfer: transfers a message representing a single AUX transaction
 *
 * The .dev field should be set to a pointer to the device that implements
 * the AUX channel.
 *
 * The .name field may be used to specify the name of the I2C adapter. If set to
 * NULL, dev_name() of .dev will be used.
 *
 * Drivers provide a hardware-specific implementation of how transactions
 * are executed via the .transfer() function. A pointer to a drm_dp_aux_msg
 * structure describing the transaction is passed into this function. Upon
 * success, the implementation should return the number of payload bytes
 * that were transferred, or a negative error-code on failure. Helpers
 * propagate errors from the .transfer() function, with the exception of
 * the -EBUSY error, which causes a transaction to be retried. On a short,
 * helpers will return -EPROTO to make it simpler to check for failure.
 *
 * An AUX channel can also be used to transport I2C messages to a sink. A
 * typical application of that is to access an EDID that's present in the
 * sink device. The .transfer() function can also be used to execute such
 * transactions. The drm_dp_aux_register() function registers an I2C
 * adapter that can be passed to drm_probe_ddc(). Upon removal, drivers
 * should call drm_dp_aux_unregister() to remove the I2C adapter.
 * The I2C adapter uses long transfers by default; if a partial response is
 * received, the adapter will drop down to the size given by the partial
 * response for this transaction only.
 *
 * Note that the aux helper code assumes that the .transfer() function
 * only modifies the reply field of the drm_dp_aux_msg structure.  The
 * retry logic and i2c helpers assume this is the case.
 */
struct drm_dp_aux {
	const char *name;
	struct i2c_adapter ddc;
	struct device *dev;
	struct mutex hw_mutex;
	ssize_t (*transfer)(struct drm_dp_aux *aux,
			    struct drm_dp_aux_msg *msg);
	/**
	 * @i2c_nack_count: Counts I2C NACKs, used for DP validation.
	 */
	unsigned i2c_nack_count;
	/**
	 * @i2c_defer_count: Counts I2C DEFERs, used for DP validation.
	 */
	unsigned i2c_defer_count;
};

ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
			 void *buffer, size_t size);
ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,
			  void *buffer, size_t size);

/**
 * drm_dp_dpcd_readb() - read a single byte from the DPCD
 * @aux: DisplayPort AUX channel
 * @offset: address of the register to read
 * @valuep: location where the value of the register will be stored
 *
 * Returns the number of bytes transferred (1) on success, or a negative
 * error code on failure.
 */
static inline ssize_t drm_dp_dpcd_readb(struct drm_dp_aux *aux,
					unsigned int offset, u8 *valuep)
{
	return drm_dp_dpcd_read(aux, offset, valuep, 1);
}

/**
 * drm_dp_dpcd_writeb() - write a single byte to the DPCD
 * @aux: DisplayPort AUX channel
 * @offset: address of the register to write
 * @value: value to write to the register
 *
 * Returns the number of bytes transferred (1) on success, or a negative
 * error code on failure.
 */
static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux,
					 unsigned int offset, u8 value)
{
	return drm_dp_dpcd_write(aux, offset, &value, 1);
}

int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
				 u8 status[DP_LINK_STATUS_SIZE]);

/*
 * DisplayPort link
 */
#define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)

struct drm_dp_link {
	unsigned char revision;
	unsigned int rate;
	unsigned int num_lanes;
	unsigned long capabilities;
};

int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);

void drm_dp_aux_init(struct drm_dp_aux *aux);
int drm_dp_aux_register(struct drm_dp_aux *aux);
void drm_dp_aux_unregister(struct drm_dp_aux *aux);

#endif /* _DRM_DP_HELPER_H_ */