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ALSA: HDA: Fix dmesg output of HDMI supported bits
[deliverable/linux.git] / sound / pci / hda / hda_eld.c
1 /*
2 * Generic routines and proc interface for ELD(EDID Like Data) information
3 *
4 * Copyright(c) 2008 Intel Corporation.
5 *
6 * Authors:
7 * Wu Fengguang <wfg@linux.intel.com>
8 *
9 * This driver is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This driver is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <sound/core.h>
27 #include <asm/unaligned.h>
28 #include "hda_codec.h"
29 #include "hda_local.h"
30
31 enum eld_versions {
32 ELD_VER_CEA_861D = 2,
33 ELD_VER_PARTIAL = 31,
34 };
35
36 enum cea_edid_versions {
37 CEA_EDID_VER_NONE = 0,
38 CEA_EDID_VER_CEA861 = 1,
39 CEA_EDID_VER_CEA861A = 2,
40 CEA_EDID_VER_CEA861BCD = 3,
41 CEA_EDID_VER_RESERVED = 4,
42 };
43
44 static char *cea_speaker_allocation_names[] = {
45 /* 0 */ "FL/FR",
46 /* 1 */ "LFE",
47 /* 2 */ "FC",
48 /* 3 */ "RL/RR",
49 /* 4 */ "RC",
50 /* 5 */ "FLC/FRC",
51 /* 6 */ "RLC/RRC",
52 /* 7 */ "FLW/FRW",
53 /* 8 */ "FLH/FRH",
54 /* 9 */ "TC",
55 /* 10 */ "FCH",
56 };
57
58 static char *eld_connection_type_names[4] = {
59 "HDMI",
60 "DisplayPort",
61 "2-reserved",
62 "3-reserved"
63 };
64
65 enum cea_audio_coding_types {
66 AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0,
67 AUDIO_CODING_TYPE_LPCM = 1,
68 AUDIO_CODING_TYPE_AC3 = 2,
69 AUDIO_CODING_TYPE_MPEG1 = 3,
70 AUDIO_CODING_TYPE_MP3 = 4,
71 AUDIO_CODING_TYPE_MPEG2 = 5,
72 AUDIO_CODING_TYPE_AACLC = 6,
73 AUDIO_CODING_TYPE_DTS = 7,
74 AUDIO_CODING_TYPE_ATRAC = 8,
75 AUDIO_CODING_TYPE_SACD = 9,
76 AUDIO_CODING_TYPE_EAC3 = 10,
77 AUDIO_CODING_TYPE_DTS_HD = 11,
78 AUDIO_CODING_TYPE_MLP = 12,
79 AUDIO_CODING_TYPE_DST = 13,
80 AUDIO_CODING_TYPE_WMAPRO = 14,
81 AUDIO_CODING_TYPE_REF_CXT = 15,
82 /* also include valid xtypes below */
83 AUDIO_CODING_TYPE_HE_AAC = 15,
84 AUDIO_CODING_TYPE_HE_AAC2 = 16,
85 AUDIO_CODING_TYPE_MPEG_SURROUND = 17,
86 };
87
88 enum cea_audio_coding_xtypes {
89 AUDIO_CODING_XTYPE_HE_REF_CT = 0,
90 AUDIO_CODING_XTYPE_HE_AAC = 1,
91 AUDIO_CODING_XTYPE_HE_AAC2 = 2,
92 AUDIO_CODING_XTYPE_MPEG_SURROUND = 3,
93 AUDIO_CODING_XTYPE_FIRST_RESERVED = 4,
94 };
95
96 static char *cea_audio_coding_type_names[] = {
97 /* 0 */ "undefined",
98 /* 1 */ "LPCM",
99 /* 2 */ "AC-3",
100 /* 3 */ "MPEG1",
101 /* 4 */ "MP3",
102 /* 5 */ "MPEG2",
103 /* 6 */ "AAC-LC",
104 /* 7 */ "DTS",
105 /* 8 */ "ATRAC",
106 /* 9 */ "DSD (One Bit Audio)",
107 /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
108 /* 11 */ "DTS-HD",
109 /* 12 */ "MLP (Dolby TrueHD)",
110 /* 13 */ "DST",
111 /* 14 */ "WMAPro",
112 /* 15 */ "HE-AAC",
113 /* 16 */ "HE-AACv2",
114 /* 17 */ "MPEG Surround",
115 };
116
117 /*
118 * The following two lists are shared between
119 * - HDMI audio InfoFrame (source to sink)
120 * - CEA E-EDID Extension (sink to source)
121 */
122
123 /*
124 * SS1:SS0 index => sample size
125 */
126 static int cea_sample_sizes[4] = {
127 0, /* 0: Refer to Stream Header */
128 AC_SUPPCM_BITS_16, /* 1: 16 bits */
129 AC_SUPPCM_BITS_20, /* 2: 20 bits */
130 AC_SUPPCM_BITS_24, /* 3: 24 bits */
131 };
132
133 /*
134 * SF2:SF1:SF0 index => sampling frequency
135 */
136 static int cea_sampling_frequencies[8] = {
137 0, /* 0: Refer to Stream Header */
138 SNDRV_PCM_RATE_32000, /* 1: 32000Hz */
139 SNDRV_PCM_RATE_44100, /* 2: 44100Hz */
140 SNDRV_PCM_RATE_48000, /* 3: 48000Hz */
141 SNDRV_PCM_RATE_88200, /* 4: 88200Hz */
142 SNDRV_PCM_RATE_96000, /* 5: 96000Hz */
143 SNDRV_PCM_RATE_176400, /* 6: 176400Hz */
144 SNDRV_PCM_RATE_192000, /* 7: 192000Hz */
145 };
146
147 static unsigned char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
148 int byte_index)
149 {
150 unsigned int val;
151
152 val = snd_hda_codec_read(codec, nid, 0,
153 AC_VERB_GET_HDMI_ELDD, byte_index);
154
155 #ifdef BE_PARANOID
156 printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
157 #endif
158
159 if ((val & AC_ELDD_ELD_VALID) == 0) {
160 snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
161 byte_index);
162 val = 0;
163 }
164
165 return val & AC_ELDD_ELD_DATA;
166 }
167
168 #define GRAB_BITS(buf, byte, lowbit, bits) \
169 ({ \
170 BUILD_BUG_ON(lowbit > 7); \
171 BUILD_BUG_ON(bits > 8); \
172 BUILD_BUG_ON(bits <= 0); \
173 \
174 (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \
175 })
176
177 static void hdmi_update_short_audio_desc(struct cea_sad *a,
178 const unsigned char *buf)
179 {
180 int i;
181 int val;
182
183 val = GRAB_BITS(buf, 1, 0, 7);
184 a->rates = 0;
185 for (i = 0; i < 7; i++)
186 if (val & (1 << i))
187 a->rates |= cea_sampling_frequencies[i + 1];
188
189 a->channels = GRAB_BITS(buf, 0, 0, 3);
190 a->channels++;
191
192 a->sample_bits = 0;
193 a->max_bitrate = 0;
194
195 a->format = GRAB_BITS(buf, 0, 3, 4);
196 switch (a->format) {
197 case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
198 snd_printd(KERN_INFO
199 "HDMI: audio coding type 0 not expected\n");
200 break;
201
202 case AUDIO_CODING_TYPE_LPCM:
203 val = GRAB_BITS(buf, 2, 0, 3);
204 for (i = 0; i < 3; i++)
205 if (val & (1 << i))
206 a->sample_bits |= cea_sample_sizes[i + 1];
207 break;
208
209 case AUDIO_CODING_TYPE_AC3:
210 case AUDIO_CODING_TYPE_MPEG1:
211 case AUDIO_CODING_TYPE_MP3:
212 case AUDIO_CODING_TYPE_MPEG2:
213 case AUDIO_CODING_TYPE_AACLC:
214 case AUDIO_CODING_TYPE_DTS:
215 case AUDIO_CODING_TYPE_ATRAC:
216 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
217 a->max_bitrate *= 8000;
218 break;
219
220 case AUDIO_CODING_TYPE_SACD:
221 break;
222
223 case AUDIO_CODING_TYPE_EAC3:
224 break;
225
226 case AUDIO_CODING_TYPE_DTS_HD:
227 break;
228
229 case AUDIO_CODING_TYPE_MLP:
230 break;
231
232 case AUDIO_CODING_TYPE_DST:
233 break;
234
235 case AUDIO_CODING_TYPE_WMAPRO:
236 a->profile = GRAB_BITS(buf, 2, 0, 3);
237 break;
238
239 case AUDIO_CODING_TYPE_REF_CXT:
240 a->format = GRAB_BITS(buf, 2, 3, 5);
241 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
242 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
243 snd_printd(KERN_INFO
244 "HDMI: audio coding xtype %d not expected\n",
245 a->format);
246 a->format = 0;
247 } else
248 a->format += AUDIO_CODING_TYPE_HE_AAC -
249 AUDIO_CODING_XTYPE_HE_AAC;
250 break;
251 }
252 }
253
254 /*
255 * Be careful, ELD buf could be totally rubbish!
256 */
257 static int hdmi_update_eld(struct hdmi_eld *e,
258 const unsigned char *buf, int size)
259 {
260 int mnl;
261 int i;
262
263 e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
264 if (e->eld_ver != ELD_VER_CEA_861D &&
265 e->eld_ver != ELD_VER_PARTIAL) {
266 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
267 e->eld_ver);
268 goto out_fail;
269 }
270
271 e->eld_size = size;
272 e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
273 mnl = GRAB_BITS(buf, 4, 0, 5);
274 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
275
276 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
277 e->support_ai = GRAB_BITS(buf, 5, 1, 1);
278 e->conn_type = GRAB_BITS(buf, 5, 2, 2);
279 e->sad_count = GRAB_BITS(buf, 5, 4, 4);
280
281 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
282 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7);
283
284 e->port_id = get_unaligned_le64(buf + 8);
285
286 /* not specified, but the spec's tendency is little endian */
287 e->manufacture_id = get_unaligned_le16(buf + 16);
288 e->product_id = get_unaligned_le16(buf + 18);
289
290 if (mnl > ELD_MAX_MNL) {
291 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
292 goto out_fail;
293 } else if (ELD_FIXED_BYTES + mnl > size) {
294 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
295 goto out_fail;
296 } else
297 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
298
299 for (i = 0; i < e->sad_count; i++) {
300 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
301 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
302 goto out_fail;
303 }
304 hdmi_update_short_audio_desc(e->sad + i,
305 buf + ELD_FIXED_BYTES + mnl + 3 * i);
306 }
307
308 return 0;
309
310 out_fail:
311 e->eld_ver = 0;
312 return -EINVAL;
313 }
314
315 static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
316 {
317 int eldv;
318 int present;
319
320 present = snd_hda_pin_sense(codec, nid);
321 eldv = (present & AC_PINSENSE_ELDV);
322 present = (present & AC_PINSENSE_PRESENCE);
323
324 #ifdef CONFIG_SND_DEBUG_VERBOSE
325 printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
326 !!present, !!eldv);
327 #endif
328
329 return eldv && present;
330 }
331
332 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
333 {
334 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
335 AC_DIPSIZE_ELD_BUF);
336 }
337
338 int snd_hdmi_get_eld(struct hdmi_eld *eld,
339 struct hda_codec *codec, hda_nid_t nid)
340 {
341 int i;
342 int ret;
343 int size;
344 unsigned char *buf;
345
346 if (!hdmi_eld_valid(codec, nid))
347 return -ENOENT;
348
349 size = snd_hdmi_get_eld_size(codec, nid);
350 if (size == 0) {
351 /* wfg: workaround for ASUS P5E-VM HDMI board */
352 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
353 size = 128;
354 }
355 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
356 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
357 return -ERANGE;
358 }
359
360 buf = kmalloc(size, GFP_KERNEL);
361 if (!buf)
362 return -ENOMEM;
363
364 for (i = 0; i < size; i++)
365 buf[i] = hdmi_get_eld_byte(codec, nid, i);
366
367 ret = hdmi_update_eld(eld, buf, size);
368
369 kfree(buf);
370 return ret;
371 }
372
373 static void hdmi_show_short_audio_desc(struct cea_sad *a)
374 {
375 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
376 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
377
378 if (!a->format)
379 return;
380
381 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
382
383 if (a->format == AUDIO_CODING_TYPE_LPCM)
384 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
385 else if (a->max_bitrate)
386 snprintf(buf2, sizeof(buf2),
387 ", max bitrate = %d", a->max_bitrate);
388 else
389 buf2[0] = '\0';
390
391 printk(KERN_INFO "HDMI: supports coding type %s:"
392 " channels = %d, rates =%s%s\n",
393 cea_audio_coding_type_names[a->format],
394 a->channels,
395 buf,
396 buf2);
397 }
398
399 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
400 {
401 int i, j;
402
403 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
404 if (spk_alloc & (1 << i))
405 j += snprintf(buf + j, buflen - j, " %s",
406 cea_speaker_allocation_names[i]);
407 }
408 buf[j] = '\0'; /* necessary when j == 0 */
409 }
410
411 void snd_hdmi_show_eld(struct hdmi_eld *e)
412 {
413 int i;
414
415 printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
416 e->monitor_name,
417 eld_connection_type_names[e->conn_type]);
418
419 if (e->spk_alloc) {
420 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
421 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
422 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
423 }
424
425 for (i = 0; i < e->sad_count; i++)
426 hdmi_show_short_audio_desc(e->sad + i);
427 }
428
429 #ifdef CONFIG_PROC_FS
430
431 static void hdmi_print_sad_info(int i, struct cea_sad *a,
432 struct snd_info_buffer *buffer)
433 {
434 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
435
436 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
437 i, a->format, cea_audio_coding_type_names[a->format]);
438 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
439
440 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
441 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
442
443 if (a->format == AUDIO_CODING_TYPE_LPCM) {
444 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
445 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
446 i, a->sample_bits, buf);
447 }
448
449 if (a->max_bitrate)
450 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
451 i, a->max_bitrate);
452
453 if (a->profile)
454 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
455 }
456
457 static void hdmi_print_eld_info(struct snd_info_entry *entry,
458 struct snd_info_buffer *buffer)
459 {
460 struct hdmi_eld *e = entry->private_data;
461 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
462 int i;
463 static char *eld_versoin_names[32] = {
464 "reserved",
465 "reserved",
466 "CEA-861D or below",
467 [3 ... 30] = "reserved",
468 [31] = "partial"
469 };
470 static char *cea_edid_version_names[8] = {
471 "no CEA EDID Timing Extension block present",
472 "CEA-861",
473 "CEA-861-A",
474 "CEA-861-B, C or D",
475 [4 ... 7] = "reserved"
476 };
477
478 snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
479 snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
480 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
481 snd_iprintf(buffer, "connection_type\t\t%s\n",
482 eld_connection_type_names[e->conn_type]);
483 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
484 eld_versoin_names[e->eld_ver]);
485 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
486 cea_edid_version_names[e->cea_edid_ver]);
487 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
488 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
489 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
490 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
491 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
492 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
493
494 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
495 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
496
497 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
498
499 for (i = 0; i < e->sad_count; i++)
500 hdmi_print_sad_info(i, e->sad + i, buffer);
501 }
502
503 static void hdmi_write_eld_info(struct snd_info_entry *entry,
504 struct snd_info_buffer *buffer)
505 {
506 struct hdmi_eld *e = entry->private_data;
507 char line[64];
508 char name[64];
509 char *sname;
510 long long val;
511 unsigned int n;
512
513 while (!snd_info_get_line(buffer, line, sizeof(line))) {
514 if (sscanf(line, "%s %llx", name, &val) != 2)
515 continue;
516 /*
517 * We don't allow modification to these fields:
518 * monitor_name manufacture_id product_id
519 * eld_version edid_version
520 */
521 if (!strcmp(name, "monitor_present"))
522 e->monitor_present = val;
523 else if (!strcmp(name, "eld_valid"))
524 e->eld_valid = val;
525 else if (!strcmp(name, "connection_type"))
526 e->conn_type = val;
527 else if (!strcmp(name, "port_id"))
528 e->port_id = val;
529 else if (!strcmp(name, "support_hdcp"))
530 e->support_hdcp = val;
531 else if (!strcmp(name, "support_ai"))
532 e->support_ai = val;
533 else if (!strcmp(name, "audio_sync_delay"))
534 e->aud_synch_delay = val;
535 else if (!strcmp(name, "speakers"))
536 e->spk_alloc = val;
537 else if (!strcmp(name, "sad_count"))
538 e->sad_count = val;
539 else if (!strncmp(name, "sad", 3)) {
540 sname = name + 4;
541 n = name[3] - '0';
542 if (name[4] >= '0' && name[4] <= '9') {
543 sname++;
544 n = 10 * n + name[4] - '0';
545 }
546 if (n >= ELD_MAX_SAD)
547 continue;
548 if (!strcmp(sname, "_coding_type"))
549 e->sad[n].format = val;
550 else if (!strcmp(sname, "_channels"))
551 e->sad[n].channels = val;
552 else if (!strcmp(sname, "_rates"))
553 e->sad[n].rates = val;
554 else if (!strcmp(sname, "_bits"))
555 e->sad[n].sample_bits = val;
556 else if (!strcmp(sname, "_max_bitrate"))
557 e->sad[n].max_bitrate = val;
558 else if (!strcmp(sname, "_profile"))
559 e->sad[n].profile = val;
560 if (n >= e->sad_count)
561 e->sad_count = n + 1;
562 }
563 }
564 }
565
566
567 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
568 int index)
569 {
570 char name[32];
571 struct snd_info_entry *entry;
572 int err;
573
574 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
575 err = snd_card_proc_new(codec->bus->card, name, &entry);
576 if (err < 0)
577 return err;
578
579 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
580 entry->c.text.write = hdmi_write_eld_info;
581 entry->mode |= S_IWUSR;
582 eld->proc_entry = entry;
583
584 return 0;
585 }
586
587 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
588 {
589 if (!codec->bus->shutdown && eld->proc_entry) {
590 snd_device_free(codec->bus->card, eld->proc_entry);
591 eld->proc_entry = NULL;
592 }
593 }
594
595 #endif /* CONFIG_PROC_FS */
596
597 /* update PCM info based on ELD */
598 void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
599 struct hda_pcm_stream *codec_pars)
600 {
601 int i;
602
603 /* assume basic audio support (the basic audio flag is not in ELD;
604 * however, all audio capable sinks are required to support basic
605 * audio) */
606 pcm->rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;
607 pcm->formats = SNDRV_PCM_FMTBIT_S16_LE;
608 pcm->maxbps = 16;
609 pcm->channels_max = 2;
610 for (i = 0; i < eld->sad_count; i++) {
611 struct cea_sad *a = &eld->sad[i];
612 pcm->rates |= a->rates;
613 if (a->channels > pcm->channels_max)
614 pcm->channels_max = a->channels;
615 if (a->format == AUDIO_CODING_TYPE_LPCM) {
616 if (a->sample_bits & AC_SUPPCM_BITS_20) {
617 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
618 if (pcm->maxbps < 20)
619 pcm->maxbps = 20;
620 }
621 if (a->sample_bits & AC_SUPPCM_BITS_24) {
622 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
623 if (pcm->maxbps < 24)
624 pcm->maxbps = 24;
625 }
626 }
627 }
628
629 if (!codec_pars)
630 return;
631
632 /* restrict the parameters by the values the codec provides */
633 pcm->rates &= codec_pars->rates;
634 pcm->formats &= codec_pars->formats;
635 pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max);
636 pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps);
637 }
Linux kernel - Deliverables
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