summaryrefslogtreecommitdiff
path: root/sound/pci/hda/hda_eld.c
blob: d081fb2880a0305e56379ef2f93f761b72baedaf (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic routines and proc interface for ELD(EDID Like Data) information
 *
 * Copyright(c) 2008 Intel Corporation.
 * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi>
 *
 * Authors:
 * 		Wu Fengguang <wfg@linux.intel.com>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <asm/unaligned.h>
#include <sound/hda_chmap.h>
#include <sound/hda_codec.h>
#include "hda_local.h"

enum eld_versions {
	ELD_VER_CEA_861D	= 2,
	ELD_VER_PARTIAL		= 31,
};

enum cea_edid_versions {
	CEA_EDID_VER_NONE	= 0,
	CEA_EDID_VER_CEA861	= 1,
	CEA_EDID_VER_CEA861A	= 2,
	CEA_EDID_VER_CEA861BCD	= 3,
	CEA_EDID_VER_RESERVED	= 4,
};

static const char * const eld_connection_type_names[4] = {
	"HDMI",
	"DisplayPort",
	"2-reserved",
	"3-reserved"
};

enum cea_audio_coding_types {
	AUDIO_CODING_TYPE_REF_STREAM_HEADER	=  0,
	AUDIO_CODING_TYPE_LPCM			=  1,
	AUDIO_CODING_TYPE_AC3			=  2,
	AUDIO_CODING_TYPE_MPEG1			=  3,
	AUDIO_CODING_TYPE_MP3			=  4,
	AUDIO_CODING_TYPE_MPEG2			=  5,
	AUDIO_CODING_TYPE_AACLC			=  6,
	AUDIO_CODING_TYPE_DTS			=  7,
	AUDIO_CODING_TYPE_ATRAC			=  8,
	AUDIO_CODING_TYPE_SACD			=  9,
	AUDIO_CODING_TYPE_EAC3			= 10,
	AUDIO_CODING_TYPE_DTS_HD		= 11,
	AUDIO_CODING_TYPE_MLP			= 12,
	AUDIO_CODING_TYPE_DST			= 13,
	AUDIO_CODING_TYPE_WMAPRO		= 14,
	AUDIO_CODING_TYPE_REF_CXT		= 15,
	/* also include valid xtypes below */
	AUDIO_CODING_TYPE_HE_AAC		= 15,
	AUDIO_CODING_TYPE_HE_AAC2		= 16,
	AUDIO_CODING_TYPE_MPEG_SURROUND		= 17,
};

enum cea_audio_coding_xtypes {
	AUDIO_CODING_XTYPE_HE_REF_CT		= 0,
	AUDIO_CODING_XTYPE_HE_AAC		= 1,
	AUDIO_CODING_XTYPE_HE_AAC2		= 2,
	AUDIO_CODING_XTYPE_MPEG_SURROUND	= 3,
	AUDIO_CODING_XTYPE_FIRST_RESERVED	= 4,
};

static const char * const cea_audio_coding_type_names[] = {
	/*  0 */ "undefined",
	/*  1 */ "LPCM",
	/*  2 */ "AC-3",
	/*  3 */ "MPEG1",
	/*  4 */ "MP3",
	/*  5 */ "MPEG2",
	/*  6 */ "AAC-LC",
	/*  7 */ "DTS",
	/*  8 */ "ATRAC",
	/*  9 */ "DSD (One Bit Audio)",
	/* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
	/* 11 */ "DTS-HD",
	/* 12 */ "MLP (Dolby TrueHD)",
	/* 13 */ "DST",
	/* 14 */ "WMAPro",
	/* 15 */ "HE-AAC",
	/* 16 */ "HE-AACv2",
	/* 17 */ "MPEG Surround",
};

/*
 * The following two lists are shared between
 * 	- HDMI audio InfoFrame (source to sink)
 * 	- CEA E-EDID Extension (sink to source)
 */

/*
 * SS1:SS0 index => sample size
 */
static int cea_sample_sizes[4] = {
	0,	 		/* 0: Refer to Stream Header */
	AC_SUPPCM_BITS_16,	/* 1: 16 bits */
	AC_SUPPCM_BITS_20,	/* 2: 20 bits */
	AC_SUPPCM_BITS_24,	/* 3: 24 bits */
};

/*
 * SF2:SF1:SF0 index => sampling frequency
 */
static int cea_sampling_frequencies[8] = {
	0,			/* 0: Refer to Stream Header */
	SNDRV_PCM_RATE_32000,	/* 1:  32000Hz */
	SNDRV_PCM_RATE_44100,	/* 2:  44100Hz */
	SNDRV_PCM_RATE_48000,	/* 3:  48000Hz */
	SNDRV_PCM_RATE_88200,	/* 4:  88200Hz */
	SNDRV_PCM_RATE_96000,	/* 5:  96000Hz */
	SNDRV_PCM_RATE_176400,	/* 6: 176400Hz */
	SNDRV_PCM_RATE_192000,	/* 7: 192000Hz */
};

static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
					int byte_index)
{
	unsigned int val;

	val = snd_hda_codec_read(codec, nid, 0,
					AC_VERB_GET_HDMI_ELDD, byte_index);
#ifdef BE_PARANOID
	codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
#endif
	return val;
}

#define GRAB_BITS(buf, byte, lowbit, bits) 		\
({							\
	BUILD_BUG_ON(lowbit > 7);			\
	BUILD_BUG_ON(bits > 8);				\
	BUILD_BUG_ON(bits <= 0);			\
							\
	(buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);	\
})

static void hdmi_update_short_audio_desc(struct hda_codec *codec,
					 struct cea_sad *a,
					 const unsigned char *buf)
{
	int i;
	int val;

	val = GRAB_BITS(buf, 1, 0, 7);
	a->rates = 0;
	for (i = 0; i < 7; i++)
		if (val & (1 << i))
			a->rates |= cea_sampling_frequencies[i + 1];

	a->channels = GRAB_BITS(buf, 0, 0, 3);
	a->channels++;

	a->sample_bits = 0;
	a->max_bitrate = 0;

	a->format = GRAB_BITS(buf, 0, 3, 4);
	switch (a->format) {
	case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
		codec_info(codec, "HDMI: audio coding type 0 not expected\n");
		break;

	case AUDIO_CODING_TYPE_LPCM:
		val = GRAB_BITS(buf, 2, 0, 3);
		for (i = 0; i < 3; i++)
			if (val & (1 << i))
				a->sample_bits |= cea_sample_sizes[i + 1];
		break;

	case AUDIO_CODING_TYPE_AC3:
	case AUDIO_CODING_TYPE_MPEG1:
	case AUDIO_CODING_TYPE_MP3:
	case AUDIO_CODING_TYPE_MPEG2:
	case AUDIO_CODING_TYPE_AACLC:
	case AUDIO_CODING_TYPE_DTS:
	case AUDIO_CODING_TYPE_ATRAC:
		a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
		a->max_bitrate *= 8000;
		break;

	case AUDIO_CODING_TYPE_SACD:
		break;

	case AUDIO_CODING_TYPE_EAC3:
		break;

	case AUDIO_CODING_TYPE_DTS_HD:
		break;

	case AUDIO_CODING_TYPE_MLP:
		break;

	case AUDIO_CODING_TYPE_DST:
		break;

	case AUDIO_CODING_TYPE_WMAPRO:
		a->profile = GRAB_BITS(buf, 2, 0, 3);
		break;

	case AUDIO_CODING_TYPE_REF_CXT:
		a->format = GRAB_BITS(buf, 2, 3, 5);
		if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
		    a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
			codec_info(codec,
				   "HDMI: audio coding xtype %d not expected\n",
				   a->format);
			a->format = 0;
		} else
			a->format += AUDIO_CODING_TYPE_HE_AAC -
				     AUDIO_CODING_XTYPE_HE_AAC;
		break;
	}
}

/*
 * Be careful, ELD buf could be totally rubbish!
 */
int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
			  const unsigned char *buf, int size)
{
	int mnl;
	int i;

	memset(e, 0, sizeof(*e));
	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
	if (e->eld_ver != ELD_VER_CEA_861D &&
	    e->eld_ver != ELD_VER_PARTIAL) {
		codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
		goto out_fail;
	}

	e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
	mnl		= GRAB_BITS(buf, 4, 0, 5);
	e->cea_edid_ver	= GRAB_BITS(buf, 4, 5, 3);

	e->support_hdcp	= GRAB_BITS(buf, 5, 0, 1);
	e->support_ai	= GRAB_BITS(buf, 5, 1, 1);
	e->conn_type	= GRAB_BITS(buf, 5, 2, 2);
	e->sad_count	= GRAB_BITS(buf, 5, 4, 4);

	e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
	e->spk_alloc	= GRAB_BITS(buf, 7, 0, 7);

	e->port_id	  = get_unaligned_le64(buf + 8);

	/* not specified, but the spec's tendency is little endian */
	e->manufacture_id = get_unaligned_le16(buf + 16);
	e->product_id	  = get_unaligned_le16(buf + 18);

	if (mnl > ELD_MAX_MNL) {
		codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
		goto out_fail;
	} else if (ELD_FIXED_BYTES + mnl > size) {
		codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
		goto out_fail;
	} else
		strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);

	for (i = 0; i < e->sad_count; i++) {
		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
			codec_info(codec, "HDMI: out of range SAD %d\n", i);
			goto out_fail;
		}
		hdmi_update_short_audio_desc(codec, e->sad + i,
					buf + ELD_FIXED_BYTES + mnl + 3 * i);
	}

	/*
	 * HDMI sink's ELD info cannot always be retrieved for now, e.g.
	 * in console or for audio devices. Assume the highest speakers
	 * configuration, to _not_ prohibit multi-channel audio playback.
	 */
	if (!e->spk_alloc)
		e->spk_alloc = 0xffff;

	return 0;

out_fail:
	return -EINVAL;
}

int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
{
	return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
						 AC_DIPSIZE_ELD_BUF);
}

int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
		     unsigned char *buf, int *eld_size)
{
	int i;
	int ret = 0;
	int size;

	/*
	 * ELD size is initialized to zero in caller function. If no errors and
	 * ELD is valid, actual eld_size is assigned.
	 */

	size = snd_hdmi_get_eld_size(codec, nid);
	if (size == 0) {
		/* wfg: workaround for ASUS P5E-VM HDMI board */
		codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
		size = 128;
	}
	if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
		codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
		return -ERANGE;
	}

	/* set ELD buffer */
	for (i = 0; i < size; i++) {
		unsigned int val = hdmi_get_eld_data(codec, nid, i);
		/*
		 * Graphics driver might be writing to ELD buffer right now.
		 * Just abort. The caller will repoll after a while.
		 */
		if (!(val & AC_ELDD_ELD_VALID)) {
			codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
			ret = -EINVAL;
			goto error;
		}
		val &= AC_ELDD_ELD_DATA;
		/*
		 * The first byte cannot be zero. This can happen on some DVI
		 * connections. Some Intel chips may also need some 250ms delay
		 * to return non-zero ELD data, even when the graphics driver
		 * correctly writes ELD content before setting ELD_valid bit.
		 */
		if (!val && !i) {
			codec_dbg(codec, "HDMI: 0 ELD data\n");
			ret = -EINVAL;
			goto error;
		}
		buf[i] = val;
	}

	*eld_size = size;
error:
	return ret;
}

/*
 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
 * hdmi-specific routine.
 */
static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
{
	static unsigned int alsa_rates[] = {
		5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
		88200, 96000, 176400, 192000, 384000
	};
	int i, j;

	for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
		if (pcm & (1 << i))
			j += snprintf(buf + j, buflen - j,  " %d",
				alsa_rates[i]);

	buf[j] = '\0'; /* necessary when j == 0 */
}

#define SND_PRINT_RATES_ADVISED_BUFSIZE	80

static void hdmi_show_short_audio_desc(struct hda_codec *codec,
				       struct cea_sad *a)
{
	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
	char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";

	if (!a->format)
		return;

	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));

	if (a->format == AUDIO_CODING_TYPE_LPCM)
		snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
	else if (a->max_bitrate)
		snprintf(buf2, sizeof(buf2),
				", max bitrate = %d", a->max_bitrate);
	else
		buf2[0] = '\0';

	codec_dbg(codec,
		  "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
		  cea_audio_coding_type_names[a->format],
		  a->channels, buf, buf2);
}

void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
{
	int i;

	codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n",
			e->monitor_name,
			eld_connection_type_names[e->conn_type]);

	if (e->spk_alloc) {
		char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
		snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
		codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
	}

	for (i = 0; i < e->sad_count; i++)
		hdmi_show_short_audio_desc(codec, e->sad + i);
}

#ifdef CONFIG_SND_PROC_FS

static void hdmi_print_sad_info(int i, struct cea_sad *a,
				struct snd_info_buffer *buffer)
{
	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];

	snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
			i, a->format, cea_audio_coding_type_names[a->format]);
	snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);

	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
	snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);

	if (a->format == AUDIO_CODING_TYPE_LPCM) {
		snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
		snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
							i, a->sample_bits, buf);
	}

	if (a->max_bitrate)
		snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
							i, a->max_bitrate);

	if (a->profile)
		snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
}

void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
			     struct snd_info_buffer *buffer)
{
	struct parsed_hdmi_eld *e = &eld->info;
	char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
	int i;
	static const char * const eld_version_names[32] = {
		"reserved",
		"reserved",
		"CEA-861D or below",
		[3 ... 30] = "reserved",
		[31] = "partial"
	};
	static const char * const cea_edid_version_names[8] = {
		"no CEA EDID Timing Extension block present",
		"CEA-861",
		"CEA-861-A",
		"CEA-861-B, C or D",
		[4 ... 7] = "reserved"
	};

	snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
	snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
	if (!eld->eld_valid)
		return;
	snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
	snd_iprintf(buffer, "connection_type\t\t%s\n",
				eld_connection_type_names[e->conn_type]);
	snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
					eld_version_names[e->eld_ver]);
	snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
				cea_edid_version_names[e->cea_edid_ver]);
	snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
	snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
	snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
	snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
	snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
	snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);

	snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
	snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);

	snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);

	for (i = 0; i < e->sad_count; i++)
		hdmi_print_sad_info(i, e->sad + i, buffer);
}

void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
			     struct snd_info_buffer *buffer)
{
	struct parsed_hdmi_eld *e = &eld->info;
	char line[64];
	char name[64];
	char *sname;
	long long val;
	unsigned int n;

	while (!snd_info_get_line(buffer, line, sizeof(line))) {
		if (sscanf(line, "%s %llx", name, &val) != 2)
			continue;
		/*
		 * We don't allow modification to these fields:
		 * 	monitor_name manufacture_id product_id
		 * 	eld_version edid_version
		 */
		if (!strcmp(name, "monitor_present"))
			eld->monitor_present = val;
		else if (!strcmp(name, "eld_valid"))
			eld->eld_valid = val;
		else if (!strcmp(name, "connection_type"))
			e->conn_type = val;
		else if (!strcmp(name, "port_id"))
			e->port_id = val;
		else if (!strcmp(name, "support_hdcp"))
			e->support_hdcp = val;
		else if (!strcmp(name, "support_ai"))
			e->support_ai = val;
		else if (!strcmp(name, "audio_sync_delay"))
			e->aud_synch_delay = val;
		else if (!strcmp(name, "speakers"))
			e->spk_alloc = val;
		else if (!strcmp(name, "sad_count"))
			e->sad_count = val;
		else if (!strncmp(name, "sad", 3)) {
			sname = name + 4;
			n = name[3] - '0';
			if (name[4] >= '0' && name[4] <= '9') {
				sname++;
				n = 10 * n + name[4] - '0';
			}
			if (n >= ELD_MAX_SAD)
				continue;
			if (!strcmp(sname, "_coding_type"))
				e->sad[n].format = val;
			else if (!strcmp(sname, "_channels"))
				e->sad[n].channels = val;
			else if (!strcmp(sname, "_rates"))
				e->sad[n].rates = val;
			else if (!strcmp(sname, "_bits"))
				e->sad[n].sample_bits = val;
			else if (!strcmp(sname, "_max_bitrate"))
				e->sad[n].max_bitrate = val;
			else if (!strcmp(sname, "_profile"))
				e->sad[n].profile = val;
			if (n >= e->sad_count)
				e->sad_count = n + 1;
		}
	}
}
#endif /* CONFIG_SND_PROC_FS */

/* update PCM info based on ELD */
void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
			      struct hda_pcm_stream *hinfo)
{
	u32 rates;
	u64 formats;
	unsigned int maxbps;
	unsigned int channels_max;
	int i;

	/* assume basic audio support (the basic audio flag is not in ELD;
	 * however, all audio capable sinks are required to support basic
	 * audio) */
	rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
		SNDRV_PCM_RATE_48000;
	formats = SNDRV_PCM_FMTBIT_S16_LE;
	maxbps = 16;
	channels_max = 2;
	for (i = 0; i < e->sad_count; i++) {
		struct cea_sad *a = &e->sad[i];
		rates |= a->rates;
		if (a->channels > channels_max)
			channels_max = a->channels;
		if (a->format == AUDIO_CODING_TYPE_LPCM) {
			if (a->sample_bits & AC_SUPPCM_BITS_20) {
				formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (maxbps < 20)
					maxbps = 20;
			}
			if (a->sample_bits & AC_SUPPCM_BITS_24) {
				formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (maxbps < 24)
					maxbps = 24;
			}
		}
	}

	/* restrict the parameters by the values the codec provides */
	hinfo->rates &= rates;
	hinfo->formats &= formats;
	hinfo->maxbps = min(hinfo->maxbps, maxbps);
	hinfo->channels_max = min(hinfo->channels_max, channels_max);
}


/* ATI/AMD specific stuff (ELD emulation) */

#define ATI_VERB_SET_AUDIO_DESCRIPTOR	0x776
#define ATI_VERB_SET_SINK_INFO_INDEX	0x780
#define ATI_VERB_GET_SPEAKER_ALLOCATION	0xf70
#define ATI_VERB_GET_AUDIO_DESCRIPTOR	0xf76
#define ATI_VERB_GET_AUDIO_VIDEO_DELAY	0xf7b
#define ATI_VERB_GET_SINK_INFO_INDEX	0xf80
#define ATI_VERB_GET_SINK_INFO_DATA	0xf81

#define ATI_SPKALLOC_SPKALLOC		0x007f
#define ATI_SPKALLOC_TYPE_HDMI		0x0100
#define ATI_SPKALLOC_TYPE_DISPLAYPORT	0x0200

/* first three bytes are just standard SAD */
#define ATI_AUDIODESC_CHANNELS		0x00000007
#define ATI_AUDIODESC_RATES		0x0000ff00
#define ATI_AUDIODESC_LPCM_STEREO_RATES	0xff000000

/* in standard HDMI VSDB format */
#define ATI_DELAY_VIDEO_LATENCY		0x000000ff
#define ATI_DELAY_AUDIO_LATENCY		0x0000ff00

enum ati_sink_info_idx {
	ATI_INFO_IDX_MANUFACTURER_ID	= 0,
	ATI_INFO_IDX_PRODUCT_ID		= 1,
	ATI_INFO_IDX_SINK_DESC_LEN	= 2,
	ATI_INFO_IDX_PORT_ID_LOW	= 3,
	ATI_INFO_IDX_PORT_ID_HIGH	= 4,
	ATI_INFO_IDX_SINK_DESC_FIRST	= 5,
	ATI_INFO_IDX_SINK_DESC_LAST	= 22, /* max len 18 bytes */
};

int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
			 unsigned char *buf, int *eld_size, bool rev3_or_later)
{
	int spkalloc, ati_sad, aud_synch;
	int sink_desc_len = 0;
	int pos, i;

	/* ATI/AMD does not have ELD, emulate it */

	spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);

	if (spkalloc <= 0) {
		codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
		return -EINVAL;
	}

	memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);

	/* version */
	buf[0] = ELD_VER_CEA_861D << 3;

	/* speaker allocation from EDID */
	buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;

	/* is DisplayPort? */
	if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
		buf[5] |= 0x04;

	pos = ELD_FIXED_BYTES;

	if (rev3_or_later) {
		int sink_info;

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
		sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
		put_unaligned_le32(sink_info, buf + 8);

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
		sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
		put_unaligned_le32(sink_info, buf + 12);

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
		sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
		put_unaligned_le16(sink_info, buf + 16);

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
		sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
		put_unaligned_le16(sink_info, buf + 18);

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
		sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);

		if (sink_desc_len > ELD_MAX_MNL) {
			codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
				   sink_desc_len);
			sink_desc_len = ELD_MAX_MNL;
		}

		buf[4] |= sink_desc_len;

		for (i = 0; i < sink_desc_len; i++) {
			snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
			buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
		}
	}

	for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
		if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
			continue; /* not handled by ATI/AMD */

		snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
		ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);

		if (ati_sad <= 0)
			continue;

		if (ati_sad & ATI_AUDIODESC_RATES) {
			/* format is supported, copy SAD as-is */
			buf[pos++] = (ati_sad & 0x0000ff) >> 0;
			buf[pos++] = (ati_sad & 0x00ff00) >> 8;
			buf[pos++] = (ati_sad & 0xff0000) >> 16;
		}

		if (i == AUDIO_CODING_TYPE_LPCM
		    && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
		    && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
			/* for PCM there is a separate stereo rate mask */
			buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
			/* rates from the extra byte */
			buf[pos++] = (ati_sad & 0xff000000) >> 24;
			buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
		}
	}

	if (pos == ELD_FIXED_BYTES + sink_desc_len) {
		codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
		return -EINVAL;
	}

	/*
	 * HDMI VSDB latency format:
	 * separately for both audio and video:
	 *  0          field not valid or unknown latency
	 *  [1..251]   msecs = (x-1)*2  (max 500ms with x = 251 = 0xfb)
	 *  255        audio/video not supported
	 *
	 * HDA latency format:
	 * single value indicating video latency relative to audio:
	 *  0          unknown or 0ms
	 *  [1..250]   msecs = x*2  (max 500ms with x = 250 = 0xfa)
	 *  [251..255] reserved
	 */
	aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
	if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
		int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
		int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;

		if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
		    video_latency_hdmi > audio_latency_hdmi)
			buf[6] = video_latency_hdmi - audio_latency_hdmi;
		/* else unknown/invalid or 0ms or video ahead of audio, so use zero */
	}

	/* SAD count */
	buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;

	/* Baseline ELD block length is 4-byte aligned */
	pos = round_up(pos, 4);

	/* Baseline ELD length (4-byte header is not counted in) */
	buf[2] = (pos - 4) / 4;

	*eld_size = pos;

	return 0;
}