1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Generic routines and proc interface for ELD(EDID Like Data) information
4 *
5 * Copyright(c) 2008 Intel Corporation.
6 * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi>
7 *
8 * Authors:
9 * Wu Fengguang <wfg@linux.intel.com>
10 */
11
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <sound/core.h>
15 #include <asm/unaligned.h>
16 #include <sound/hda_chmap.h>
17 #include <sound/hda_codec.h>
18 #include "hda_local.h"
19
20 enum eld_versions {
21 ELD_VER_CEA_861D = 2,
22 ELD_VER_PARTIAL = 31,
23 };
24
25 enum cea_edid_versions {
26 CEA_EDID_VER_NONE = 0,
27 CEA_EDID_VER_CEA861 = 1,
28 CEA_EDID_VER_CEA861A = 2,
29 CEA_EDID_VER_CEA861BCD = 3,
30 CEA_EDID_VER_RESERVED = 4,
31 };
32
33 static const char * const eld_connection_type_names[4] = {
34 "HDMI",
35 "DisplayPort",
36 "2-reserved",
37 "3-reserved"
38 };
39
40 enum cea_audio_coding_types {
41 AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0,
42 AUDIO_CODING_TYPE_LPCM = 1,
43 AUDIO_CODING_TYPE_AC3 = 2,
44 AUDIO_CODING_TYPE_MPEG1 = 3,
45 AUDIO_CODING_TYPE_MP3 = 4,
46 AUDIO_CODING_TYPE_MPEG2 = 5,
47 AUDIO_CODING_TYPE_AACLC = 6,
48 AUDIO_CODING_TYPE_DTS = 7,
49 AUDIO_CODING_TYPE_ATRAC = 8,
50 AUDIO_CODING_TYPE_SACD = 9,
51 AUDIO_CODING_TYPE_EAC3 = 10,
52 AUDIO_CODING_TYPE_DTS_HD = 11,
53 AUDIO_CODING_TYPE_MLP = 12,
54 AUDIO_CODING_TYPE_DST = 13,
55 AUDIO_CODING_TYPE_WMAPRO = 14,
56 AUDIO_CODING_TYPE_REF_CXT = 15,
57 /* also include valid xtypes below */
58 AUDIO_CODING_TYPE_HE_AAC = 15,
59 AUDIO_CODING_TYPE_HE_AAC2 = 16,
60 AUDIO_CODING_TYPE_MPEG_SURROUND = 17,
61 };
62
63 enum cea_audio_coding_xtypes {
64 AUDIO_CODING_XTYPE_HE_REF_CT = 0,
65 AUDIO_CODING_XTYPE_HE_AAC = 1,
66 AUDIO_CODING_XTYPE_HE_AAC2 = 2,
67 AUDIO_CODING_XTYPE_MPEG_SURROUND = 3,
68 AUDIO_CODING_XTYPE_FIRST_RESERVED = 4,
69 };
70
71 static const char * const cea_audio_coding_type_names[] = {
72 /* 0 */ "undefined",
73 /* 1 */ "LPCM",
74 /* 2 */ "AC-3",
75 /* 3 */ "MPEG1",
76 /* 4 */ "MP3",
77 /* 5 */ "MPEG2",
78 /* 6 */ "AAC-LC",
79 /* 7 */ "DTS",
80 /* 8 */ "ATRAC",
81 /* 9 */ "DSD (One Bit Audio)",
82 /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
83 /* 11 */ "DTS-HD",
84 /* 12 */ "MLP (Dolby TrueHD)",
85 /* 13 */ "DST",
86 /* 14 */ "WMAPro",
87 /* 15 */ "HE-AAC",
88 /* 16 */ "HE-AACv2",
89 /* 17 */ "MPEG Surround",
90 };
91
92 /*
93 * The following two lists are shared between
94 * - HDMI audio InfoFrame (source to sink)
95 * - CEA E-EDID Extension (sink to source)
96 */
97
98 /*
99 * SS1:SS0 index => sample size
100 */
101 static const int cea_sample_sizes[4] = {
102 0, /* 0: Refer to Stream Header */
103 AC_SUPPCM_BITS_16, /* 1: 16 bits */
104 AC_SUPPCM_BITS_20, /* 2: 20 bits */
105 AC_SUPPCM_BITS_24, /* 3: 24 bits */
106 };
107
108 /*
109 * SF2:SF1:SF0 index => sampling frequency
110 */
111 static const int cea_sampling_frequencies[8] = {
112 0, /* 0: Refer to Stream Header */
113 SNDRV_PCM_RATE_32000, /* 1: 32000Hz */
114 SNDRV_PCM_RATE_44100, /* 2: 44100Hz */
115 SNDRV_PCM_RATE_48000, /* 3: 48000Hz */
116 SNDRV_PCM_RATE_88200, /* 4: 88200Hz */
117 SNDRV_PCM_RATE_96000, /* 5: 96000Hz */
118 SNDRV_PCM_RATE_176400, /* 6: 176400Hz */
119 SNDRV_PCM_RATE_192000, /* 7: 192000Hz */
120 };
121
122 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
123 int byte_index)
124 {
125 unsigned int val;
126
127 val = snd_hda_codec_read(codec, nid, 0,
128 AC_VERB_GET_HDMI_ELDD, byte_index);
129 #ifdef BE_PARANOID
130 codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
131 #endif
132 return val;
133 }
134
135 #define GRAB_BITS(buf, byte, lowbit, bits) \
136 ({ \
137 BUILD_BUG_ON(lowbit > 7); \
138 BUILD_BUG_ON(bits > 8); \
139 BUILD_BUG_ON(bits <= 0); \
140 \
141 (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \
142 })
143
144 static void hdmi_update_short_audio_desc(struct hda_codec *codec,
145 struct cea_sad *a,
146 const unsigned char *buf)
147 {
148 int i;
149 int val;
150
151 val = GRAB_BITS(buf, 1, 0, 7);
152 a->rates = 0;
153 for (i = 0; i < 7; i++)
154 if (val & (1 << i))
155 a->rates |= cea_sampling_frequencies[i + 1];
156
157 a->channels = GRAB_BITS(buf, 0, 0, 3);
158 a->channels++;
159
160 a->sample_bits = 0;
161 a->max_bitrate = 0;
162
163 a->format = GRAB_BITS(buf, 0, 3, 4);
164 switch (a->format) {
165 case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
166 codec_info(codec, "HDMI: audio coding type 0 not expected\n");
167 break;
168
169 case AUDIO_CODING_TYPE_LPCM:
170 val = GRAB_BITS(buf, 2, 0, 3);
171 for (i = 0; i < 3; i++)
172 if (val & (1 << i))
173 a->sample_bits |= cea_sample_sizes[i + 1];
174 break;
175
176 case AUDIO_CODING_TYPE_AC3:
177 case AUDIO_CODING_TYPE_MPEG1:
178 case AUDIO_CODING_TYPE_MP3:
179 case AUDIO_CODING_TYPE_MPEG2:
180 case AUDIO_CODING_TYPE_AACLC:
181 case AUDIO_CODING_TYPE_DTS:
182 case AUDIO_CODING_TYPE_ATRAC:
183 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
184 a->max_bitrate *= 8000;
185 break;
186
187 case AUDIO_CODING_TYPE_SACD:
188 break;
189
190 case AUDIO_CODING_TYPE_EAC3:
191 break;
192
193 case AUDIO_CODING_TYPE_DTS_HD:
194 break;
195
196 case AUDIO_CODING_TYPE_MLP:
197 break;
198
199 case AUDIO_CODING_TYPE_DST:
200 break;
201
202 case AUDIO_CODING_TYPE_WMAPRO:
203 a->profile = GRAB_BITS(buf, 2, 0, 3);
204 break;
205
206 case AUDIO_CODING_TYPE_REF_CXT:
207 a->format = GRAB_BITS(buf, 2, 3, 5);
208 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
209 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
210 codec_info(codec,
211 "HDMI: audio coding xtype %d not expected\n",
212 a->format);
213 a->format = 0;
214 } else
215 a->format += AUDIO_CODING_TYPE_HE_AAC -
216 AUDIO_CODING_XTYPE_HE_AAC;
217 break;
218 }
219 }
220
221 /*
222 * Be careful, ELD buf could be totally rubbish!
223 */
224 int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
225 const unsigned char *buf, int size)
226 {
227 int mnl;
228 int i;
229
230 memset(e, 0, sizeof(*e));
231 e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
232 if (e->eld_ver != ELD_VER_CEA_861D &&
233 e->eld_ver != ELD_VER_PARTIAL) {
234 codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
235 goto out_fail;
236 }
237
238 e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
239 mnl = GRAB_BITS(buf, 4, 0, 5);
240 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
241
242 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
243 e->support_ai = GRAB_BITS(buf, 5, 1, 1);
244 e->conn_type = GRAB_BITS(buf, 5, 2, 2);
245 e->sad_count = GRAB_BITS(buf, 5, 4, 4);
246
247 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
248 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7);
249
250 e->port_id = get_unaligned_le64(buf + 8);
251
252 /* not specified, but the spec's tendency is little endian */
253 e->manufacture_id = get_unaligned_le16(buf + 16);
254 e->product_id = get_unaligned_le16(buf + 18);
255
256 if (mnl > ELD_MAX_MNL) {
257 codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
258 goto out_fail;
259 } else if (ELD_FIXED_BYTES + mnl > size) {
260 codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
261 goto out_fail;
262 } else
263 strscpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
264
265 for (i = 0; i < e->sad_count; i++) {
266 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
267 codec_info(codec, "HDMI: out of range SAD %d\n", i);
268 goto out_fail;
269 }
270 hdmi_update_short_audio_desc(codec, e->sad + i,
271 buf + ELD_FIXED_BYTES + mnl + 3 * i);
272 }
273
274 /*
275 * HDMI sink's ELD info cannot always be retrieved for now, e.g.
276 * in console or for audio devices. Assume the highest speakers
277 * configuration, to _not_ prohibit multi-channel audio playback.
278 */
279 if (!e->spk_alloc)
280 e->spk_alloc = 0xffff;
281
282 return 0;
283
284 out_fail:
285 return -EINVAL;
286 }
287
288 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
289 {
290 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
291 AC_DIPSIZE_ELD_BUF);
292 }
293
294 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
295 unsigned char *buf, int *eld_size)
296 {
297 int i;
298 int ret = 0;
299 int size;
300
301 /*
302 * ELD size is initialized to zero in caller function. If no errors and
303 * ELD is valid, actual eld_size is assigned.
304 */
305
306 size = snd_hdmi_get_eld_size(codec, nid);
307 if (size == 0) {
308 /* wfg: workaround for ASUS P5E-VM HDMI board */
309 codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
310 size = 128;
311 }
312 if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
313 codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
314 return -ERANGE;
315 }
316
317 /* set ELD buffer */
318 for (i = 0; i < size; i++) {
319 unsigned int val = hdmi_get_eld_data(codec, nid, i);
320 /*
321 * Graphics driver might be writing to ELD buffer right now.
322 * Just abort. The caller will repoll after a while.
323 */
324 if (!(val & AC_ELDD_ELD_VALID)) {
325 codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
326 ret = -EINVAL;
327 goto error;
328 }
329 val &= AC_ELDD_ELD_DATA;
330 /*
331 * The first byte cannot be zero. This can happen on some DVI
332 * connections. Some Intel chips may also need some 250ms delay
333 * to return non-zero ELD data, even when the graphics driver
334 * correctly writes ELD content before setting ELD_valid bit.
335 */
336 if (!val && !i) {
337 codec_dbg(codec, "HDMI: 0 ELD data\n");
338 ret = -EINVAL;
339 goto error;
340 }
341 buf[i] = val;
342 }
343
344 *eld_size = size;
345 error:
346 return ret;
347 }
348
349 /*
350 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
351 * hdmi-specific routine.
352 */
353 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
354 {
355 static const unsigned int alsa_rates[] = {
356 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
357 88200, 96000, 176400, 192000, 384000
358 };
359 int i, j;
360
361 for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
362 if (pcm & (1 << i))
363 j += scnprintf(buf + j, buflen - j, " %d",
364 alsa_rates[i]);
365
366 buf[j] = '\0'; /* necessary when j == 0 */
367 }
368
369 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80
370
371 static void hdmi_show_short_audio_desc(struct hda_codec *codec,
372 struct cea_sad *a)
373 {
374 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
375 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
376
377 if (!a->format)
378 return;
379
380 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
381
382 if (a->format == AUDIO_CODING_TYPE_LPCM)
383 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
384 else if (a->max_bitrate)
385 snprintf(buf2, sizeof(buf2),
386 ", max bitrate = %d", a->max_bitrate);
387 else
388 buf2[0] = '\0';
389
390 codec_dbg(codec,
391 "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
392 cea_audio_coding_type_names[a->format],
393 a->channels, buf, buf2);
394 }
395
396 void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
397 {
398 int i;
399
400 codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n",
401 e->monitor_name,
402 eld_connection_type_names[e->conn_type]);
403
404 if (e->spk_alloc) {
405 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
406 snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
407 codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
408 }
409
410 for (i = 0; i < e->sad_count; i++)
411 hdmi_show_short_audio_desc(codec, e->sad + i);
412 }
413
414 #ifdef CONFIG_SND_PROC_FS
415
416 static void hdmi_print_sad_info(int i, struct cea_sad *a,
417 struct snd_info_buffer *buffer)
418 {
419 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
420
421 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
422 i, a->format, cea_audio_coding_type_names[a->format]);
423 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
424
425 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
426 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
427
428 if (a->format == AUDIO_CODING_TYPE_LPCM) {
429 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
430 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
431 i, a->sample_bits, buf);
432 }
433
434 if (a->max_bitrate)
435 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
436 i, a->max_bitrate);
437
438 if (a->profile)
439 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
440 }
441
442 void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
443 struct snd_info_buffer *buffer,
444 hda_nid_t pin_nid, int dev_id, hda_nid_t cvt_nid)
445 {
446 struct parsed_hdmi_eld *e = &eld->info;
447 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
448 int i;
449 static const char * const eld_version_names[32] = {
450 "reserved",
451 "reserved",
452 "CEA-861D or below",
453 [3 ... 30] = "reserved",
454 [31] = "partial"
455 };
456 static const char * const cea_edid_version_names[8] = {
457 "no CEA EDID Timing Extension block present",
458 "CEA-861",
459 "CEA-861-A",
460 "CEA-861-B, C or D",
461 [4 ... 7] = "reserved"
462 };
463
464 snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
465 snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
466 snd_iprintf(buffer, "codec_pin_nid\t\t0x%x\n", pin_nid);
467 snd_iprintf(buffer, "codec_dev_id\t\t0x%x\n", dev_id);
468 snd_iprintf(buffer, "codec_cvt_nid\t\t0x%x\n", cvt_nid);
469 if (!eld->eld_valid)
470 return;
471 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
472 snd_iprintf(buffer, "connection_type\t\t%s\n",
473 eld_connection_type_names[e->conn_type]);
474 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
475 eld_version_names[e->eld_ver]);
476 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
477 cea_edid_version_names[e->cea_edid_ver]);
478 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
479 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
480 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
481 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
482 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
483 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
484
485 snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
486 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
487
488 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
489
490 for (i = 0; i < e->sad_count; i++)
491 hdmi_print_sad_info(i, e->sad + i, buffer);
492 }
493
494 void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
495 struct snd_info_buffer *buffer)
496 {
497 struct parsed_hdmi_eld *e = &eld->info;
498 char line[64];
499 char name[64];
500 char *sname;
501 long long val;
502 unsigned int n;
503
504 while (!snd_info_get_line(buffer, line, sizeof(line))) {
505 if (sscanf(line, "%s %llx", name, &val) != 2)
506 continue;
507 /*
508 * We don't allow modification to these fields:
509 * monitor_name manufacture_id product_id
510 * eld_version edid_version
511 */
512 if (!strcmp(name, "monitor_present"))
513 eld->monitor_present = val;
514 else if (!strcmp(name, "eld_valid"))
515 eld->eld_valid = val;
516 else if (!strcmp(name, "connection_type"))
517 e->conn_type = val;
518 else if (!strcmp(name, "port_id"))
519 e->port_id = val;
520 else if (!strcmp(name, "support_hdcp"))
521 e->support_hdcp = val;
522 else if (!strcmp(name, "support_ai"))
523 e->support_ai = val;
524 else if (!strcmp(name, "audio_sync_delay"))
525 e->aud_synch_delay = val;
526 else if (!strcmp(name, "speakers"))
527 e->spk_alloc = val;
528 else if (!strcmp(name, "sad_count"))
529 e->sad_count = val;
530 else if (!strncmp(name, "sad", 3)) {
531 sname = name + 4;
532 n = name[3] - '';
533 if (name[4] >= '' && name[4] <= '9') {
534 sname++;
535 n = 10 * n + name[4] - '';
536 }
537 if (n >= ELD_MAX_SAD)
538 continue;
539 if (!strcmp(sname, "_coding_type"))
540 e->sad[n].format = val;
541 else if (!strcmp(sname, "_channels"))
542 e->sad[n].channels = val;
543 else if (!strcmp(sname, "_rates"))
544 e->sad[n].rates = val;
545 else if (!strcmp(sname, "_bits"))
546 e->sad[n].sample_bits = val;
547 else if (!strcmp(sname, "_max_bitrate"))
548 e->sad[n].max_bitrate = val;
549 else if (!strcmp(sname, "_profile"))
550 e->sad[n].profile = val;
551 if (n >= e->sad_count)
552 e->sad_count = n + 1;
553 }
554 }
555 }
556 #endif /* CONFIG_SND_PROC_FS */
557
558 /* update PCM info based on ELD */
559 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
560 struct hda_pcm_stream *hinfo)
561 {
562 u32 rates;
563 u64 formats;
564 unsigned int maxbps;
565 unsigned int channels_max;
566 int i;
567
568 /* assume basic audio support (the basic audio flag is not in ELD;
569 * however, all audio capable sinks are required to support basic
570 * audio) */
571 rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
572 SNDRV_PCM_RATE_48000;
573 formats = SNDRV_PCM_FMTBIT_S16_LE;
574 maxbps = 16;
575 channels_max = 2;
576 for (i = 0; i < e->sad_count; i++) {
577 struct cea_sad *a = &e->sad[i];
578 rates |= a->rates;
579 if (a->channels > channels_max)
580 channels_max = a->channels;
581 if (a->format == AUDIO_CODING_TYPE_LPCM) {
582 if (a->sample_bits & AC_SUPPCM_BITS_20) {
583 formats |= SNDRV_PCM_FMTBIT_S32_LE;
584 if (maxbps < 20)
585 maxbps = 20;
586 }
587 if (a->sample_bits & AC_SUPPCM_BITS_24) {
588 formats |= SNDRV_PCM_FMTBIT_S32_LE;
589 if (maxbps < 24)
590 maxbps = 24;
591 }
592 }
593 }
594
595 /* restrict the parameters by the values the codec provides */
596 hinfo->rates &= rates;
597 hinfo->formats &= formats;
598 hinfo->maxbps = min(hinfo->maxbps, maxbps);
599 hinfo->channels_max = min(hinfo->channels_max, channels_max);
600 }
601
602
603 /* ATI/AMD specific stuff (ELD emulation) */
604
605 #define ATI_VERB_SET_AUDIO_DESCRIPTOR 0x776
606 #define ATI_VERB_SET_SINK_INFO_INDEX 0x780
607 #define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70
608 #define ATI_VERB_GET_AUDIO_DESCRIPTOR 0xf76
609 #define ATI_VERB_GET_AUDIO_VIDEO_DELAY 0xf7b
610 #define ATI_VERB_GET_SINK_INFO_INDEX 0xf80
611 #define ATI_VERB_GET_SINK_INFO_DATA 0xf81
612
613 #define ATI_SPKALLOC_SPKALLOC 0x007f
614 #define ATI_SPKALLOC_TYPE_HDMI 0x0100
615 #define ATI_SPKALLOC_TYPE_DISPLAYPORT 0x0200
616
617 /* first three bytes are just standard SAD */
618 #define ATI_AUDIODESC_CHANNELS 0x00000007
619 #define ATI_AUDIODESC_RATES 0x0000ff00
620 #define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000
621
622 /* in standard HDMI VSDB format */
623 #define ATI_DELAY_VIDEO_LATENCY 0x000000ff
624 #define ATI_DELAY_AUDIO_LATENCY 0x0000ff00
625
626 enum ati_sink_info_idx {
627 ATI_INFO_IDX_MANUFACTURER_ID = 0,
628 ATI_INFO_IDX_PRODUCT_ID = 1,
629 ATI_INFO_IDX_SINK_DESC_LEN = 2,
630 ATI_INFO_IDX_PORT_ID_LOW = 3,
631 ATI_INFO_IDX_PORT_ID_HIGH = 4,
632 ATI_INFO_IDX_SINK_DESC_FIRST = 5,
633 ATI_INFO_IDX_SINK_DESC_LAST = 22, /* max len 18 bytes */
634 };
635
636 int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
637 unsigned char *buf, int *eld_size, bool rev3_or_later)
638 {
639 int spkalloc, ati_sad, aud_synch;
640 int sink_desc_len = 0;
641 int pos, i;
642
643 /* ATI/AMD does not have ELD, emulate it */
644
645 spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);
646
647 if (spkalloc <= 0) {
648 codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
649 return -EINVAL;
650 }
651
652 memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);
653
654 /* version */
655 buf[0] = ELD_VER_CEA_861D << 3;
656
657 /* speaker allocation from EDID */
658 buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;
659
660 /* is DisplayPort? */
661 if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
662 buf[5] |= 0x04;
663
664 pos = ELD_FIXED_BYTES;
665
666 if (rev3_or_later) {
667 int sink_info;
668
669 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
670 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
671 put_unaligned_le32(sink_info, buf + 8);
672
673 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
674 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
675 put_unaligned_le32(sink_info, buf + 12);
676
677 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
678 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
679 put_unaligned_le16(sink_info, buf + 16);
680
681 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
682 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
683 put_unaligned_le16(sink_info, buf + 18);
684
685 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
686 sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
687
688 if (sink_desc_len > ELD_MAX_MNL) {
689 codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
690 sink_desc_len);
691 sink_desc_len = ELD_MAX_MNL;
692 }
693
694 buf[4] |= sink_desc_len;
695
696 for (i = 0; i < sink_desc_len; i++) {
697 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
698 buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
699 }
700 }
701
702 for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
703 if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
704 continue; /* not handled by ATI/AMD */
705
706 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
707 ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);
708
709 if (ati_sad <= 0)
710 continue;
711
712 if (ati_sad & ATI_AUDIODESC_RATES) {
713 /* format is supported, copy SAD as-is */
714 buf[pos++] = (ati_sad & 0x0000ff) >> 0;
715 buf[pos++] = (ati_sad & 0x00ff00) >> 8;
716 buf[pos++] = (ati_sad & 0xff0000) >> 16;
717 }
718
719 if (i == AUDIO_CODING_TYPE_LPCM
720 && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
721 && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
722 /* for PCM there is a separate stereo rate mask */
723 buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
724 /* rates from the extra byte */
725 buf[pos++] = (ati_sad & 0xff000000) >> 24;
726 buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
727 }
728 }
729
730 if (pos == ELD_FIXED_BYTES + sink_desc_len) {
731 codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
732 return -EINVAL;
733 }
734
735 /*
736 * HDMI VSDB latency format:
737 * separately for both audio and video:
738 * 0 field not valid or unknown latency
739 * [1..251] msecs = (x-1)*2 (max 500ms with x = 251 = 0xfb)
740 * 255 audio/video not supported
741 *
742 * HDA latency format:
743 * single value indicating video latency relative to audio:
744 * 0 unknown or 0ms
745 * [1..250] msecs = x*2 (max 500ms with x = 250 = 0xfa)
746 * [251..255] reserved
747 */
748 aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
749 if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
750 int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
751 int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;
752
753 if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
754 video_latency_hdmi > audio_latency_hdmi)
755 buf[6] = video_latency_hdmi - audio_latency_hdmi;
756 /* else unknown/invalid or 0ms or video ahead of audio, so use zero */
757 }
758
759 /* SAD count */
760 buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
761
762 /* Baseline ELD block length is 4-byte aligned */
763 pos = round_up(pos, 4);
764
765 /* Baseline ELD length (4-byte header is not counted in) */
766 buf[2] = (pos - 4) / 4;
767
768 *eld_size = pos;
769
770 return 0;
771 }
772
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