summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/intel_audio.c
blob: d76f3033e890b6da60ae6b017dab311e9a29c8da (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
/*
 * Copyright © 2014 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/component.h>
#include <drm/i915_component.h>
#include <drm/intel_lpe_audio.h>
#include "intel_drv.h"

#include <drm/drmP.h>
#include <drm/drm_edid.h>
#include "i915_drv.h"

/**
 * DOC: High Definition Audio over HDMI and Display Port
 *
 * The graphics and audio drivers together support High Definition Audio over
 * HDMI and Display Port. The audio programming sequences are divided into audio
 * codec and controller enable and disable sequences. The graphics driver
 * handles the audio codec sequences, while the audio driver handles the audio
 * controller sequences.
 *
 * The disable sequences must be performed before disabling the transcoder or
 * port. The enable sequences may only be performed after enabling the
 * transcoder and port, and after completed link training. Therefore the audio
 * enable/disable sequences are part of the modeset sequence.
 *
 * The codec and controller sequences could be done either parallel or serial,
 * but generally the ELDV/PD change in the codec sequence indicates to the audio
 * driver that the controller sequence should start. Indeed, most of the
 * co-operation between the graphics and audio drivers is handled via audio
 * related registers. (The notable exception is the power management, not
 * covered here.)
 *
 * The struct &i915_audio_component is used to interact between the graphics
 * and audio drivers. The struct &i915_audio_component_ops @ops in it is
 * defined in graphics driver and called in audio driver. The
 * struct &i915_audio_component_audio_ops @audio_ops is called from i915 driver.
 */

/* DP N/M table */
#define LC_540M	540000
#define LC_270M	270000
#define LC_162M	162000

struct dp_aud_n_m {
	int sample_rate;
	int clock;
	u16 m;
	u16 n;
};

/* Values according to DP 1.4 Table 2-104 */
static const struct dp_aud_n_m dp_aud_n_m[] = {
	{ 32000, LC_162M, 1024, 10125 },
	{ 44100, LC_162M, 784, 5625 },
	{ 48000, LC_162M, 512, 3375 },
	{ 64000, LC_162M, 2048, 10125 },
	{ 88200, LC_162M, 1568, 5625 },
	{ 96000, LC_162M, 1024, 3375 },
	{ 128000, LC_162M, 4096, 10125 },
	{ 176400, LC_162M, 3136, 5625 },
	{ 192000, LC_162M, 2048, 3375 },
	{ 32000, LC_270M, 1024, 16875 },
	{ 44100, LC_270M, 784, 9375 },
	{ 48000, LC_270M, 512, 5625 },
	{ 64000, LC_270M, 2048, 16875 },
	{ 88200, LC_270M, 1568, 9375 },
	{ 96000, LC_270M, 1024, 5625 },
	{ 128000, LC_270M, 4096, 16875 },
	{ 176400, LC_270M, 3136, 9375 },
	{ 192000, LC_270M, 2048, 5625 },
	{ 32000, LC_540M, 1024, 33750 },
	{ 44100, LC_540M, 784, 18750 },
	{ 48000, LC_540M, 512, 11250 },
	{ 64000, LC_540M, 2048, 33750 },
	{ 88200, LC_540M, 1568, 18750 },
	{ 96000, LC_540M, 1024, 11250 },
	{ 128000, LC_540M, 4096, 33750 },
	{ 176400, LC_540M, 3136, 18750 },
	{ 192000, LC_540M, 2048, 11250 },
};

static const struct dp_aud_n_m *
audio_config_dp_get_n_m(struct intel_crtc *intel_crtc, int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(dp_aud_n_m); i++) {
		if (rate == dp_aud_n_m[i].sample_rate &&
		    intel_crtc->config->port_clock == dp_aud_n_m[i].clock)
			return &dp_aud_n_m[i];
	}

	return NULL;
}

static const struct {
	int clock;
	u32 config;
} hdmi_audio_clock[] = {
	{ 25175, AUD_CONFIG_PIXEL_CLOCK_HDMI_25175 },
	{ 25200, AUD_CONFIG_PIXEL_CLOCK_HDMI_25200 }, /* default per bspec */
	{ 27000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27000 },
	{ 27027, AUD_CONFIG_PIXEL_CLOCK_HDMI_27027 },
	{ 54000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54000 },
	{ 54054, AUD_CONFIG_PIXEL_CLOCK_HDMI_54054 },
	{ 74176, AUD_CONFIG_PIXEL_CLOCK_HDMI_74176 },
	{ 74250, AUD_CONFIG_PIXEL_CLOCK_HDMI_74250 },
	{ 148352, AUD_CONFIG_PIXEL_CLOCK_HDMI_148352 },
	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
};

/* HDMI N/CTS table */
#define TMDS_297M 297000
#define TMDS_296M 296703
static const struct {
	int sample_rate;
	int clock;
	int n;
	int cts;
} hdmi_aud_ncts[] = {
	{ 44100, TMDS_296M, 4459, 234375 },
	{ 44100, TMDS_297M, 4704, 247500 },
	{ 48000, TMDS_296M, 5824, 281250 },
	{ 48000, TMDS_297M, 5120, 247500 },
	{ 32000, TMDS_296M, 5824, 421875 },
	{ 32000, TMDS_297M, 3072, 222750 },
	{ 88200, TMDS_296M, 8918, 234375 },
	{ 88200, TMDS_297M, 9408, 247500 },
	{ 96000, TMDS_296M, 11648, 281250 },
	{ 96000, TMDS_297M, 10240, 247500 },
	{ 176400, TMDS_296M, 17836, 234375 },
	{ 176400, TMDS_297M, 18816, 247500 },
	{ 192000, TMDS_296M, 23296, 281250 },
	{ 192000, TMDS_297M, 20480, 247500 },
};

/* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
static u32 audio_config_hdmi_pixel_clock(const struct drm_display_mode *adjusted_mode)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(hdmi_audio_clock); i++) {
		if (adjusted_mode->crtc_clock == hdmi_audio_clock[i].clock)
			break;
	}

	if (i == ARRAY_SIZE(hdmi_audio_clock)) {
		DRM_DEBUG_KMS("HDMI audio pixel clock setting for %d not found, falling back to defaults\n",
			      adjusted_mode->crtc_clock);
		i = 1;
	}

	DRM_DEBUG_KMS("Configuring HDMI audio for pixel clock %d (0x%08x)\n",
		      hdmi_audio_clock[i].clock,
		      hdmi_audio_clock[i].config);

	return hdmi_audio_clock[i].config;
}

static int audio_config_hdmi_get_n(const struct drm_display_mode *adjusted_mode,
				   int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(hdmi_aud_ncts); i++) {
		if (rate == hdmi_aud_ncts[i].sample_rate &&
		    adjusted_mode->crtc_clock == hdmi_aud_ncts[i].clock) {
			return hdmi_aud_ncts[i].n;
		}
	}
	return 0;
}

static bool intel_eld_uptodate(struct drm_connector *connector,
			       i915_reg_t reg_eldv, uint32_t bits_eldv,
			       i915_reg_t reg_elda, uint32_t bits_elda,
			       i915_reg_t reg_edid)
{
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	uint8_t *eld = connector->eld;
	uint32_t tmp;
	int i;

	tmp = I915_READ(reg_eldv);
	tmp &= bits_eldv;

	if (!tmp)
		return false;

	tmp = I915_READ(reg_elda);
	tmp &= ~bits_elda;
	I915_WRITE(reg_elda, tmp);

	for (i = 0; i < drm_eld_size(eld) / 4; i++)
		if (I915_READ(reg_edid) != *((uint32_t *)eld + i))
			return false;

	return true;
}

static void g4x_audio_codec_disable(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	uint32_t eldv, tmp;

	DRM_DEBUG_KMS("Disable audio codec\n");

	tmp = I915_READ(G4X_AUD_VID_DID);
	if (tmp == INTEL_AUDIO_DEVBLC || tmp == INTEL_AUDIO_DEVCL)
		eldv = G4X_ELDV_DEVCL_DEVBLC;
	else
		eldv = G4X_ELDV_DEVCTG;

	/* Invalidate ELD */
	tmp = I915_READ(G4X_AUD_CNTL_ST);
	tmp &= ~eldv;
	I915_WRITE(G4X_AUD_CNTL_ST, tmp);
}

static void g4x_audio_codec_enable(struct drm_connector *connector,
				   struct intel_encoder *encoder,
				   const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	uint8_t *eld = connector->eld;
	uint32_t eldv;
	uint32_t tmp;
	int len, i;

	DRM_DEBUG_KMS("Enable audio codec, %u bytes ELD\n", eld[2]);

	tmp = I915_READ(G4X_AUD_VID_DID);
	if (tmp == INTEL_AUDIO_DEVBLC || tmp == INTEL_AUDIO_DEVCL)
		eldv = G4X_ELDV_DEVCL_DEVBLC;
	else
		eldv = G4X_ELDV_DEVCTG;

	if (intel_eld_uptodate(connector,
			       G4X_AUD_CNTL_ST, eldv,
			       G4X_AUD_CNTL_ST, G4X_ELD_ADDR_MASK,
			       G4X_HDMIW_HDMIEDID))
		return;

	tmp = I915_READ(G4X_AUD_CNTL_ST);
	tmp &= ~(eldv | G4X_ELD_ADDR_MASK);
	len = (tmp >> 9) & 0x1f;		/* ELD buffer size */
	I915_WRITE(G4X_AUD_CNTL_ST, tmp);

	len = min(drm_eld_size(eld) / 4, len);
	DRM_DEBUG_DRIVER("ELD size %d\n", len);
	for (i = 0; i < len; i++)
		I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));

	tmp = I915_READ(G4X_AUD_CNTL_ST);
	tmp |= eldv;
	I915_WRITE(G4X_AUD_CNTL_ST, tmp);
}

static void
hsw_dp_audio_config_update(struct intel_crtc *intel_crtc, enum port port,
			   const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
	struct i915_audio_component *acomp = dev_priv->audio_component;
	int rate = acomp ? acomp->aud_sample_rate[port] : 0;
	const struct dp_aud_n_m *nm = audio_config_dp_get_n_m(intel_crtc, rate);
	enum pipe pipe = intel_crtc->pipe;
	u32 tmp;

	if (nm)
		DRM_DEBUG_KMS("using Maud %u, Naud %u\n", nm->m, nm->n);
	else
		DRM_DEBUG_KMS("using automatic Maud, Naud\n");

	tmp = I915_READ(HSW_AUD_CFG(pipe));
	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
	tmp |= AUD_CONFIG_N_VALUE_INDEX;

	if (nm) {
		tmp &= ~AUD_CONFIG_N_MASK;
		tmp |= AUD_CONFIG_N(nm->n);
		tmp |= AUD_CONFIG_N_PROG_ENABLE;
	}

	I915_WRITE(HSW_AUD_CFG(pipe), tmp);

	tmp = I915_READ(HSW_AUD_M_CTS_ENABLE(pipe));
	tmp &= ~AUD_CONFIG_M_MASK;
	tmp &= ~AUD_M_CTS_M_VALUE_INDEX;
	tmp &= ~AUD_M_CTS_M_PROG_ENABLE;

	if (nm) {
		tmp |= nm->m;
		tmp |= AUD_M_CTS_M_VALUE_INDEX;
		tmp |= AUD_M_CTS_M_PROG_ENABLE;
	}

	I915_WRITE(HSW_AUD_M_CTS_ENABLE(pipe), tmp);
}

static void
hsw_hdmi_audio_config_update(struct intel_crtc *intel_crtc, enum port port,
			     const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
	struct i915_audio_component *acomp = dev_priv->audio_component;
	int rate = acomp ? acomp->aud_sample_rate[port] : 0;
	enum pipe pipe = intel_crtc->pipe;
	int n;
	u32 tmp;

	tmp = I915_READ(HSW_AUD_CFG(pipe));
	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
	tmp |= audio_config_hdmi_pixel_clock(adjusted_mode);

	n = audio_config_hdmi_get_n(adjusted_mode, rate);
	if (n != 0) {
		DRM_DEBUG_KMS("using N %d\n", n);

		tmp &= ~AUD_CONFIG_N_MASK;
		tmp |= AUD_CONFIG_N(n);
		tmp |= AUD_CONFIG_N_PROG_ENABLE;
	} else {
		DRM_DEBUG_KMS("using automatic N\n");
	}

	I915_WRITE(HSW_AUD_CFG(pipe), tmp);

	/*
	 * Let's disable "Enable CTS or M Prog bit"
	 * and let HW calculate the value
	 */
	tmp = I915_READ(HSW_AUD_M_CTS_ENABLE(pipe));
	tmp &= ~AUD_M_CTS_M_PROG_ENABLE;
	tmp &= ~AUD_M_CTS_M_VALUE_INDEX;
	I915_WRITE(HSW_AUD_M_CTS_ENABLE(pipe), tmp);
}

static void
hsw_audio_config_update(struct intel_crtc *intel_crtc, enum port port,
			const struct drm_display_mode *adjusted_mode)
{
	if (intel_crtc_has_dp_encoder(intel_crtc->config))
		hsw_dp_audio_config_update(intel_crtc, port, adjusted_mode);
	else
		hsw_hdmi_audio_config_update(intel_crtc, port, adjusted_mode);
}

static void hsw_audio_codec_disable(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
	enum pipe pipe = intel_crtc->pipe;
	uint32_t tmp;

	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n", pipe_name(pipe));

	mutex_lock(&dev_priv->av_mutex);

	/* Disable timestamps */
	tmp = I915_READ(HSW_AUD_CFG(pipe));
	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
	tmp |= AUD_CONFIG_N_PROG_ENABLE;
	tmp &= ~AUD_CONFIG_UPPER_N_MASK;
	tmp &= ~AUD_CONFIG_LOWER_N_MASK;
	if (intel_crtc_has_dp_encoder(intel_crtc->config))
		tmp |= AUD_CONFIG_N_VALUE_INDEX;
	I915_WRITE(HSW_AUD_CFG(pipe), tmp);

	/* Invalidate ELD */
	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
	tmp &= ~AUDIO_ELD_VALID(pipe);
	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);

	mutex_unlock(&dev_priv->av_mutex);
}

static void hsw_audio_codec_enable(struct drm_connector *connector,
				   struct intel_encoder *intel_encoder,
				   const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	struct intel_crtc *intel_crtc = to_intel_crtc(intel_encoder->base.crtc);
	enum pipe pipe = intel_crtc->pipe;
	enum port port = intel_encoder->port;
	const uint8_t *eld = connector->eld;
	uint32_t tmp;
	int len, i;

	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
		      pipe_name(pipe), drm_eld_size(eld));

	mutex_lock(&dev_priv->av_mutex);

	/* Enable audio presence detect, invalidate ELD */
	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
	tmp &= ~AUDIO_ELD_VALID(pipe);
	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);

	/*
	 * FIXME: We're supposed to wait for vblank here, but we have vblanks
	 * disabled during the mode set. The proper fix would be to push the
	 * rest of the setup into a vblank work item, queued here, but the
	 * infrastructure is not there yet.
	 */

	/* Reset ELD write address */
	tmp = I915_READ(HSW_AUD_DIP_ELD_CTRL(pipe));
	tmp &= ~IBX_ELD_ADDRESS_MASK;
	I915_WRITE(HSW_AUD_DIP_ELD_CTRL(pipe), tmp);

	/* Up to 84 bytes of hw ELD buffer */
	len = min(drm_eld_size(eld), 84);
	for (i = 0; i < len / 4; i++)
		I915_WRITE(HSW_AUD_EDID_DATA(pipe), *((uint32_t *)eld + i));

	/* ELD valid */
	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
	tmp |= AUDIO_ELD_VALID(pipe);
	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);

	/* Enable timestamps */
	hsw_audio_config_update(intel_crtc, port, adjusted_mode);

	mutex_unlock(&dev_priv->av_mutex);
}

static void ilk_audio_codec_disable(struct intel_encoder *intel_encoder)
{
	struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
	struct intel_crtc *intel_crtc = to_intel_crtc(intel_encoder->base.crtc);
	enum pipe pipe = intel_crtc->pipe;
	enum port port = intel_encoder->port;
	uint32_t tmp, eldv;
	i915_reg_t aud_config, aud_cntrl_st2;

	DRM_DEBUG_KMS("Disable audio codec on port %c, pipe %c\n",
		      port_name(port), pipe_name(pipe));

	if (WARN_ON(port == PORT_A))
		return;

	if (HAS_PCH_IBX(dev_priv)) {
		aud_config = IBX_AUD_CFG(pipe);
		aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
		aud_config = VLV_AUD_CFG(pipe);
		aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
	} else {
		aud_config = CPT_AUD_CFG(pipe);
		aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
	}

	/* Disable timestamps */
	tmp = I915_READ(aud_config);
	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
	tmp |= AUD_CONFIG_N_PROG_ENABLE;
	tmp &= ~AUD_CONFIG_UPPER_N_MASK;
	tmp &= ~AUD_CONFIG_LOWER_N_MASK;
	if (intel_crtc_has_dp_encoder(intel_crtc->config))
		tmp |= AUD_CONFIG_N_VALUE_INDEX;
	I915_WRITE(aud_config, tmp);

	eldv = IBX_ELD_VALID(port);

	/* Invalidate ELD */
	tmp = I915_READ(aud_cntrl_st2);
	tmp &= ~eldv;
	I915_WRITE(aud_cntrl_st2, tmp);
}

static void ilk_audio_codec_enable(struct drm_connector *connector,
				   struct intel_encoder *intel_encoder,
				   const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	struct intel_crtc *intel_crtc = to_intel_crtc(intel_encoder->base.crtc);
	enum pipe pipe = intel_crtc->pipe;
	enum port port = intel_encoder->port;
	uint8_t *eld = connector->eld;
	uint32_t tmp, eldv;
	int len, i;
	i915_reg_t hdmiw_hdmiedid, aud_config, aud_cntl_st, aud_cntrl_st2;

	DRM_DEBUG_KMS("Enable audio codec on port %c, pipe %c, %u bytes ELD\n",
		      port_name(port), pipe_name(pipe), drm_eld_size(eld));

	if (WARN_ON(port == PORT_A))
		return;

	/*
	 * FIXME: We're supposed to wait for vblank here, but we have vblanks
	 * disabled during the mode set. The proper fix would be to push the
	 * rest of the setup into a vblank work item, queued here, but the
	 * infrastructure is not there yet.
	 */

	if (HAS_PCH_IBX(dev_priv)) {
		hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID(pipe);
		aud_config = IBX_AUD_CFG(pipe);
		aud_cntl_st = IBX_AUD_CNTL_ST(pipe);
		aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
	} else if (IS_VALLEYVIEW(dev_priv) ||
		   IS_CHERRYVIEW(dev_priv)) {
		hdmiw_hdmiedid = VLV_HDMIW_HDMIEDID(pipe);
		aud_config = VLV_AUD_CFG(pipe);
		aud_cntl_st = VLV_AUD_CNTL_ST(pipe);
		aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
	} else {
		hdmiw_hdmiedid = CPT_HDMIW_HDMIEDID(pipe);
		aud_config = CPT_AUD_CFG(pipe);
		aud_cntl_st = CPT_AUD_CNTL_ST(pipe);
		aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
	}

	eldv = IBX_ELD_VALID(port);

	/* Invalidate ELD */
	tmp = I915_READ(aud_cntrl_st2);
	tmp &= ~eldv;
	I915_WRITE(aud_cntrl_st2, tmp);

	/* Reset ELD write address */
	tmp = I915_READ(aud_cntl_st);
	tmp &= ~IBX_ELD_ADDRESS_MASK;
	I915_WRITE(aud_cntl_st, tmp);

	/* Up to 84 bytes of hw ELD buffer */
	len = min(drm_eld_size(eld), 84);
	for (i = 0; i < len / 4; i++)
		I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));

	/* ELD valid */
	tmp = I915_READ(aud_cntrl_st2);
	tmp |= eldv;
	I915_WRITE(aud_cntrl_st2, tmp);

	/* Enable timestamps */
	tmp = I915_READ(aud_config);
	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
	if (intel_crtc_has_dp_encoder(intel_crtc->config))
		tmp |= AUD_CONFIG_N_VALUE_INDEX;
	else
		tmp |= audio_config_hdmi_pixel_clock(adjusted_mode);
	I915_WRITE(aud_config, tmp);
}

/**
 * intel_audio_codec_enable - Enable the audio codec for HD audio
 * @intel_encoder: encoder on which to enable audio
 * @crtc_state: pointer to the current crtc state.
 * @conn_state: pointer to the current connector state.
 *
 * The enable sequences may only be performed after enabling the transcoder and
 * port, and after completed link training.
 */
void intel_audio_codec_enable(struct intel_encoder *intel_encoder,
			      const struct intel_crtc_state *crtc_state,
			      const struct drm_connector_state *conn_state)
{
	struct drm_encoder *encoder = &intel_encoder->base;
	const struct drm_display_mode *adjusted_mode = &crtc_state->base.adjusted_mode;
	struct drm_connector *connector;
	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
	struct i915_audio_component *acomp = dev_priv->audio_component;
	enum port port = intel_encoder->port;
	enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;

	connector = conn_state->connector;
	if (!connector || !connector->eld[0])
		return;

	DRM_DEBUG_DRIVER("ELD on [CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
			 connector->base.id,
			 connector->name,
			 connector->encoder->base.id,
			 connector->encoder->name);

	/* ELD Conn_Type */
	connector->eld[5] &= ~(3 << 2);
	if (intel_crtc_has_dp_encoder(crtc_state))
		connector->eld[5] |= (1 << 2);

	connector->eld[6] = drm_av_sync_delay(connector, adjusted_mode) / 2;

	if (dev_priv->display.audio_codec_enable)
		dev_priv->display.audio_codec_enable(connector, intel_encoder,
						     adjusted_mode);

	mutex_lock(&dev_priv->av_mutex);
	intel_encoder->audio_connector = connector;

	/* referred in audio callbacks */
	dev_priv->av_enc_map[pipe] = intel_encoder;
	mutex_unlock(&dev_priv->av_mutex);

	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify) {
		/* audio drivers expect pipe = -1 to indicate Non-MST cases */
		if (intel_encoder->type != INTEL_OUTPUT_DP_MST)
			pipe = -1;
		acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
						 (int) port, (int) pipe);
	}

	switch (intel_encoder->type) {
	case INTEL_OUTPUT_HDMI:
		intel_lpe_audio_notify(dev_priv, connector->eld, port, pipe,
				       crtc_state->port_clock,
				       false, 0);
		break;
	case INTEL_OUTPUT_DP:
		intel_lpe_audio_notify(dev_priv, connector->eld, port, pipe,
				       adjusted_mode->crtc_clock,
				       true, crtc_state->port_clock);
		break;
	default:
		break;
	}
}

/**
 * intel_audio_codec_disable - Disable the audio codec for HD audio
 * @intel_encoder: encoder on which to disable audio
 *
 * The disable sequences must be performed before disabling the transcoder or
 * port.
 */
void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
{
	struct drm_encoder *encoder = &intel_encoder->base;
	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
	struct i915_audio_component *acomp = dev_priv->audio_component;
	enum port port = intel_encoder->port;
	struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
	enum pipe pipe = crtc->pipe;

	if (dev_priv->display.audio_codec_disable)
		dev_priv->display.audio_codec_disable(intel_encoder);

	mutex_lock(&dev_priv->av_mutex);
	intel_encoder->audio_connector = NULL;
	dev_priv->av_enc_map[pipe] = NULL;
	mutex_unlock(&dev_priv->av_mutex);

	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify) {
		/* audio drivers expect pipe = -1 to indicate Non-MST cases */
		if (intel_encoder->type != INTEL_OUTPUT_DP_MST)
			pipe = -1;
		acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
						 (int) port, (int) pipe);
	}

	intel_lpe_audio_notify(dev_priv, NULL, port, pipe, 0, false, 0);
}

/**
 * intel_init_audio_hooks - Set up chip specific audio hooks
 * @dev_priv: device private
 */
void intel_init_audio_hooks(struct drm_i915_private *dev_priv)
{
	if (IS_G4X(dev_priv)) {
		dev_priv->display.audio_codec_enable = g4x_audio_codec_enable;
		dev_priv->display.audio_codec_disable = g4x_audio_codec_disable;
	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
		dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
	} else if (IS_HASWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 8) {
		dev_priv->display.audio_codec_enable = hsw_audio_codec_enable;
		dev_priv->display.audio_codec_disable = hsw_audio_codec_disable;
	} else if (HAS_PCH_SPLIT(dev_priv)) {
		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
		dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
	}
}

static void i915_audio_component_get_power(struct device *kdev)
{
	intel_display_power_get(kdev_to_i915(kdev), POWER_DOMAIN_AUDIO);
}

static void i915_audio_component_put_power(struct device *kdev)
{
	intel_display_power_put(kdev_to_i915(kdev), POWER_DOMAIN_AUDIO);
}

static void i915_audio_component_codec_wake_override(struct device *kdev,
						     bool enable)
{
	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
	u32 tmp;

	if (!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv))
		return;

	i915_audio_component_get_power(kdev);

	/*
	 * Enable/disable generating the codec wake signal, overriding the
	 * internal logic to generate the codec wake to controller.
	 */
	tmp = I915_READ(HSW_AUD_CHICKENBIT);
	tmp &= ~SKL_AUD_CODEC_WAKE_SIGNAL;
	I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
	usleep_range(1000, 1500);

	if (enable) {
		tmp = I915_READ(HSW_AUD_CHICKENBIT);
		tmp |= SKL_AUD_CODEC_WAKE_SIGNAL;
		I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
		usleep_range(1000, 1500);
	}

	i915_audio_component_put_power(kdev);
}

/* Get CDCLK in kHz  */
static int i915_audio_component_get_cdclk_freq(struct device *kdev)
{
	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);

	if (WARN_ON_ONCE(!HAS_DDI(dev_priv)))
		return -ENODEV;

	return dev_priv->cdclk_freq;
}

/*
 * get the intel_encoder according to the parameter port and pipe
 * intel_encoder is saved by the index of pipe
 * MST & (pipe >= 0): return the av_enc_map[pipe],
 *   when port is matched
 * MST & (pipe < 0): this is invalid
 * Non-MST & (pipe >= 0): only pipe = 0 (the first device entry)
 *   will get the right intel_encoder with port matched
 * Non-MST & (pipe < 0): get the right intel_encoder with port matched
 */
static struct intel_encoder *get_saved_enc(struct drm_i915_private *dev_priv,
					       int port, int pipe)
{
	struct intel_encoder *encoder;

	if (WARN_ON(pipe >= I915_MAX_PIPES))
		return NULL;

	/* MST */
	if (pipe >= 0) {
		encoder = dev_priv->av_enc_map[pipe];
		/*
		 * when bootup, audio driver may not know it is
		 * MST or not. So it will poll all the port & pipe
		 * combinations
		 */
		if (encoder != NULL && encoder->port == port &&
		    encoder->type == INTEL_OUTPUT_DP_MST)
			return encoder;
	}

	/* Non-MST */
	if (pipe > 0)
		return NULL;

	for_each_pipe(dev_priv, pipe) {
		encoder = dev_priv->av_enc_map[pipe];
		if (encoder == NULL)
			continue;

		if (encoder->type == INTEL_OUTPUT_DP_MST)
			continue;

		if (port == encoder->port)
			return encoder;
	}

	return NULL;
}

static int i915_audio_component_sync_audio_rate(struct device *kdev, int port,
						int pipe, int rate)
{
	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
	struct intel_encoder *intel_encoder;
	struct intel_crtc *crtc;
	struct drm_display_mode *adjusted_mode;
	struct i915_audio_component *acomp = dev_priv->audio_component;
	int err = 0;

	if (!HAS_DDI(dev_priv))
		return 0;

	i915_audio_component_get_power(kdev);
	mutex_lock(&dev_priv->av_mutex);

	/* 1. get the pipe */
	intel_encoder = get_saved_enc(dev_priv, port, pipe);
	if (!intel_encoder || !intel_encoder->base.crtc) {
		DRM_DEBUG_KMS("Not valid for port %c\n", port_name(port));
		err = -ENODEV;
		goto unlock;
	}

	/* pipe passed from the audio driver will be -1 for Non-MST case */
	crtc = to_intel_crtc(intel_encoder->base.crtc);
	pipe = crtc->pipe;

	adjusted_mode = &crtc->config->base.adjusted_mode;

	/* port must be valid now, otherwise the pipe will be invalid */
	acomp->aud_sample_rate[port] = rate;

	hsw_audio_config_update(crtc, port, adjusted_mode);

 unlock:
	mutex_unlock(&dev_priv->av_mutex);
	i915_audio_component_put_power(kdev);
	return err;
}

static int i915_audio_component_get_eld(struct device *kdev, int port,
					int pipe, bool *enabled,
					unsigned char *buf, int max_bytes)
{
	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
	struct intel_encoder *intel_encoder;
	const u8 *eld;
	int ret = -EINVAL;

	mutex_lock(&dev_priv->av_mutex);

	intel_encoder = get_saved_enc(dev_priv, port, pipe);
	if (!intel_encoder) {
		DRM_DEBUG_KMS("Not valid for port %c\n", port_name(port));
		mutex_unlock(&dev_priv->av_mutex);
		return ret;
	}

	ret = 0;
	*enabled = intel_encoder->audio_connector != NULL;
	if (*enabled) {
		eld = intel_encoder->audio_connector->eld;
		ret = drm_eld_size(eld);
		memcpy(buf, eld, min(max_bytes, ret));
	}

	mutex_unlock(&dev_priv->av_mutex);
	return ret;
}

static const struct i915_audio_component_ops i915_audio_component_ops = {
	.owner		= THIS_MODULE,
	.get_power	= i915_audio_component_get_power,
	.put_power	= i915_audio_component_put_power,
	.codec_wake_override = i915_audio_component_codec_wake_override,
	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
	.sync_audio_rate = i915_audio_component_sync_audio_rate,
	.get_eld	= i915_audio_component_get_eld,
};

static int i915_audio_component_bind(struct device *i915_kdev,
				     struct device *hda_kdev, void *data)
{
	struct i915_audio_component *acomp = data;
	struct drm_i915_private *dev_priv = kdev_to_i915(i915_kdev);
	int i;

	if (WARN_ON(acomp->ops || acomp->dev))
		return -EEXIST;

	drm_modeset_lock_all(&dev_priv->drm);
	acomp->ops = &i915_audio_component_ops;
	acomp->dev = i915_kdev;
	BUILD_BUG_ON(MAX_PORTS != I915_MAX_PORTS);
	for (i = 0; i < ARRAY_SIZE(acomp->aud_sample_rate); i++)
		acomp->aud_sample_rate[i] = 0;
	dev_priv->audio_component = acomp;
	drm_modeset_unlock_all(&dev_priv->drm);

	return 0;
}

static void i915_audio_component_unbind(struct device *i915_kdev,
					struct device *hda_kdev, void *data)
{
	struct i915_audio_component *acomp = data;
	struct drm_i915_private *dev_priv = kdev_to_i915(i915_kdev);

	drm_modeset_lock_all(&dev_priv->drm);
	acomp->ops = NULL;
	acomp->dev = NULL;
	dev_priv->audio_component = NULL;
	drm_modeset_unlock_all(&dev_priv->drm);
}

static const struct component_ops i915_audio_component_bind_ops = {
	.bind	= i915_audio_component_bind,
	.unbind	= i915_audio_component_unbind,
};

/**
 * i915_audio_component_init - initialize and register the audio component
 * @dev_priv: i915 device instance
 *
 * This will register with the component framework a child component which
 * will bind dynamically to the snd_hda_intel driver's corresponding master
 * component when the latter is registered. During binding the child
 * initializes an instance of struct i915_audio_component which it receives
 * from the master. The master can then start to use the interface defined by
 * this struct. Each side can break the binding at any point by deregistering
 * its own component after which each side's component unbind callback is
 * called.
 *
 * We ignore any error during registration and continue with reduced
 * functionality (i.e. without HDMI audio).
 */
void i915_audio_component_init(struct drm_i915_private *dev_priv)
{
	int ret;

	if (INTEL_INFO(dev_priv)->num_pipes == 0)
		return;

	ret = component_add(dev_priv->drm.dev, &i915_audio_component_bind_ops);
	if (ret < 0) {
		DRM_ERROR("failed to add audio component (%d)\n", ret);
		/* continue with reduced functionality */
		return;
	}

	dev_priv->audio_component_registered = true;
}

/**
 * i915_audio_component_cleanup - deregister the audio component
 * @dev_priv: i915 device instance
 *
 * Deregisters the audio component, breaking any existing binding to the
 * corresponding snd_hda_intel driver's master component.
 */
void i915_audio_component_cleanup(struct drm_i915_private *dev_priv)
{
	if (!dev_priv->audio_component_registered)
		return;

	component_del(dev_priv->drm.dev, &i915_audio_component_bind_ops);
	dev_priv->audio_component_registered = false;
}

/**
 * intel_audio_init() - Initialize the audio driver either using
 * component framework or using lpe audio bridge
 * @dev_priv: the i915 drm device private data
 *
 */
void intel_audio_init(struct drm_i915_private *dev_priv)
{
	if (intel_lpe_audio_init(dev_priv) < 0)
		i915_audio_component_init(dev_priv);
}

/**
 * intel_audio_deinit() - deinitialize the audio driver
 * @dev_priv: the i915 drm device private data
 *
 */
void intel_audio_deinit(struct drm_i915_private *dev_priv)
{
	if ((dev_priv)->lpe_audio.platdev != NULL)
		intel_lpe_audio_teardown(dev_priv);
	else
		i915_audio_component_cleanup(dev_priv);
}