?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / sound / pci / hda / hda_eld.c
blobc34f730f481568042b334e4973ae0569f5fdea9b
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 int hdmi_get_eld_data(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 #ifdef BE_PARANOID
155 printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
156 #endif
157 return val;
158 }
159
160 #define GRAB_BITS(buf, byte, lowbit, bits) \
161 ({ \
162 BUILD_BUG_ON(lowbit > 7); \
163 BUILD_BUG_ON(bits > 8); \
164 BUILD_BUG_ON(bits <= 0); \
165 \
166 (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \
167 })
168
169 static void hdmi_update_short_audio_desc(struct cea_sad *a,
170 const unsigned char *buf)
171 {
172 int i;
173 int val;
174
175 val = GRAB_BITS(buf, 1, 0, 7);
176 a->rates = 0;
177 for (i = 0; i < 7; i++)
178 if (val & (1 << i))
179 a->rates |= cea_sampling_frequencies[i + 1];
180
181 a->channels = GRAB_BITS(buf, 0, 0, 3);
182 a->channels++;
183
184 a->sample_bits = 0;
185 a->max_bitrate = 0;
186
187 a->format = GRAB_BITS(buf, 0, 3, 4);
188 switch (a->format) {
189 case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
190 snd_printd(KERN_INFO
191 "HDMI: audio coding type 0 not expected\n");
192 break;
193
194 case AUDIO_CODING_TYPE_LPCM:
195 val = GRAB_BITS(buf, 2, 0, 3);
196 for (i = 0; i < 3; i++)
197 if (val & (1 << i))
198 a->sample_bits |= cea_sample_sizes[i + 1];
199 break;
200
201 case AUDIO_CODING_TYPE_AC3:
202 case AUDIO_CODING_TYPE_MPEG1:
203 case AUDIO_CODING_TYPE_MP3:
204 case AUDIO_CODING_TYPE_MPEG2:
205 case AUDIO_CODING_TYPE_AACLC:
206 case AUDIO_CODING_TYPE_DTS:
207 case AUDIO_CODING_TYPE_ATRAC:
208 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
209 a->max_bitrate *= 8000;
210 break;
211
212 case AUDIO_CODING_TYPE_SACD:
213 break;
214
215 case AUDIO_CODING_TYPE_EAC3:
216 break;
217
218 case AUDIO_CODING_TYPE_DTS_HD:
219 break;
220
221 case AUDIO_CODING_TYPE_MLP:
222 break;
223
224 case AUDIO_CODING_TYPE_DST:
225 break;
226
227 case AUDIO_CODING_TYPE_WMAPRO:
228 a->profile = GRAB_BITS(buf, 2, 0, 3);
229 break;
230
231 case AUDIO_CODING_TYPE_REF_CXT:
232 a->format = GRAB_BITS(buf, 2, 3, 5);
233 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
234 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
235 snd_printd(KERN_INFO
236 "HDMI: audio coding xtype %d not expected\n",
237 a->format);
238 a->format = 0;
239 } else
240 a->format += AUDIO_CODING_TYPE_HE_AAC -
241 AUDIO_CODING_XTYPE_HE_AAC;
242 break;
243 }
244 }
245
246 /*
247 * Be careful, ELD buf could be totally rubbish!
248 */
249 static int hdmi_update_eld(struct hdmi_eld *e,
250 const unsigned char *buf, int size)
251 {
252 int mnl;
253 int i;
254
255 e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
256 if (e->eld_ver != ELD_VER_CEA_861D &&
257 e->eld_ver != ELD_VER_PARTIAL) {
258 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
259 e->eld_ver);
260 goto out_fail;
261 }
262
263 e->eld_size = size;
264 e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
265 mnl = GRAB_BITS(buf, 4, 0, 5);
266 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
267
268 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
269 e->support_ai = GRAB_BITS(buf, 5, 1, 1);
270 e->conn_type = GRAB_BITS(buf, 5, 2, 2);
271 e->sad_count = GRAB_BITS(buf, 5, 4, 4);
272
273 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
274 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7);
275
276 e->port_id = get_unaligned_le64(buf + 8);
277
278 /* not specified, but the spec's tendency is little endian */
279 e->manufacture_id = get_unaligned_le16(buf + 16);
280 e->product_id = get_unaligned_le16(buf + 18);
281
282 if (mnl > ELD_MAX_MNL) {
283 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
284 goto out_fail;
285 } else if (ELD_FIXED_BYTES + mnl > size) {
286 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
287 goto out_fail;
288 } else
289 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
290
291 for (i = 0; i < e->sad_count; i++) {
292 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
293 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
294 goto out_fail;
295 }
296 hdmi_update_short_audio_desc(e->sad + i,
297 buf + ELD_FIXED_BYTES + mnl + 3 * i);
298 }
299
300 return 0;
301
302 out_fail:
303 e->eld_ver = 0;
304 return -EINVAL;
305 }
306
307 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
308 {
309 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
310 AC_DIPSIZE_ELD_BUF);
311 }
312
313 int snd_hdmi_get_eld(struct hdmi_eld *eld,
314 struct hda_codec *codec, hda_nid_t nid)
315 {
316 int i;
317 int ret;
318 int size;
319 unsigned char *buf;
320
321 if (!eld->eld_valid)
322 return -ENOENT;
323
324 size = snd_hdmi_get_eld_size(codec, nid);
325 if (size == 0) {
326 /* wfg: workaround for ASUS P5E-VM HDMI board */
327 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
328 size = 128;
329 }
330 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
331 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
332 return -ERANGE;
333 }
334
335 buf = kmalloc(size, GFP_KERNEL);
336 if (!buf)
337 return -ENOMEM;
338
339 for (i = 0; i < size; i++) {
340 unsigned int val = hdmi_get_eld_data(codec, nid, i);
341 if (!(val & AC_ELDD_ELD_VALID)) {
342 if (!i) {
343 snd_printd(KERN_INFO
344 "HDMI: invalid ELD data\n");
345 ret = -EINVAL;
346 goto error;
347 }
348 snd_printd(KERN_INFO
349 "HDMI: invalid ELD data byte %d\n", i);
350 val = 0;
351 } else
352 val &= AC_ELDD_ELD_DATA;
353 buf[i] = val;
354 }
355
356 ret = hdmi_update_eld(eld, buf, size);
357
358 error:
359 kfree(buf);
360 return ret;
361 }
362
363 static void hdmi_show_short_audio_desc(struct cea_sad *a)
364 {
365 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
366 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
367
368 if (!a->format)
369 return;
370
371 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
372
373 if (a->format == AUDIO_CODING_TYPE_LPCM)
374 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
375 else if (a->max_bitrate)
376 snprintf(buf2, sizeof(buf2),
377 ", max bitrate = %d", a->max_bitrate);
378 else
379 buf2[0] = '\0';
380
381 printk(KERN_INFO "HDMI: supports coding type %s:"
382 " channels = %d, rates =%s%s\n",
383 cea_audio_coding_type_names[a->format],
384 a->channels,
385 buf,
386 buf2);
387 }
388
389 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
390 {
391 int i, j;
392
393 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
394 if (spk_alloc & (1 << i))
395 j += snprintf(buf + j, buflen - j, " %s",
396 cea_speaker_allocation_names[i]);
397 }
398 buf[j] = '\0'; /* necessary when j == 0 */
399 }
400
401 void snd_hdmi_show_eld(struct hdmi_eld *e)
402 {
403 int i;
404
405 printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
406 e->monitor_name,
407 eld_connection_type_names[e->conn_type]);
408
409 if (e->spk_alloc) {
410 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
411 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
412 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
413 }
414
415 for (i = 0; i < e->sad_count; i++)
416 hdmi_show_short_audio_desc(e->sad + i);
417 }
418
419 #ifdef CONFIG_PROC_FS
420
421 static void hdmi_print_sad_info(int i, struct cea_sad *a,
422 struct snd_info_buffer *buffer)
423 {
424 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
425
426 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
427 i, a->format, cea_audio_coding_type_names[a->format]);
428 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
429
430 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
431 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
432
433 if (a->format == AUDIO_CODING_TYPE_LPCM) {
434 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
435 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
436 i, a->sample_bits, buf);
437 }
438
439 if (a->max_bitrate)
440 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
441 i, a->max_bitrate);
442
443 if (a->profile)
444 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
445 }
446
447 static void hdmi_print_eld_info(struct snd_info_entry *entry,
448 struct snd_info_buffer *buffer)
449 {
450 struct hdmi_eld *e = entry->private_data;
451 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
452 int i;
453 static char *eld_versoin_names[32] = {
454 "reserved",
455 "reserved",
456 "CEA-861D or below",
457 [3 ... 30] = "reserved",
458 [31] = "partial"
459 };
460 static char *cea_edid_version_names[8] = {
461 "no CEA EDID Timing Extension block present",
462 "CEA-861",
463 "CEA-861-A",
464 "CEA-861-B, C or D",
465 [4 ... 7] = "reserved"
466 };
467
468 snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
469 snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
470 if (!e->eld_valid)
471 return;
472 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
473 snd_iprintf(buffer, "connection_type\t\t%s\n",
474 eld_connection_type_names[e->conn_type]);
475 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
476 eld_versoin_names[e->eld_ver]);
477 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
478 cea_edid_version_names[e->cea_edid_ver]);
479 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
480 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
481 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
482 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
483 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
484 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
485
486 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
487 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
488
489 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
490
491 for (i = 0; i < e->sad_count; i++)
492 hdmi_print_sad_info(i, e->sad + i, buffer);
493 }
494
495 static void hdmi_write_eld_info(struct snd_info_entry *entry,
496 struct snd_info_buffer *buffer)
497 {
498 struct hdmi_eld *e = entry->private_data;
499 char line[64];
500 char name[64];
501 char *sname;
502 long long val;
503 unsigned int n;
504
505 while (!snd_info_get_line(buffer, line, sizeof(line))) {
506 if (sscanf(line, "%s %llx", name, &val) != 2)
507 continue;
508 /*
509 * We don't allow modification to these fields:
510 * monitor_name manufacture_id product_id
511 * eld_version edid_version
512 */
513 if (!strcmp(name, "monitor_present"))
514 e->monitor_present = val;
515 else if (!strcmp(name, "eld_valid"))
516 e->eld_valid = val;
517 else if (!strcmp(name, "connection_type"))
518 e->conn_type = val;
519 else if (!strcmp(name, "port_id"))
520 e->port_id = val;
521 else if (!strcmp(name, "support_hdcp"))
522 e->support_hdcp = val;
523 else if (!strcmp(name, "support_ai"))
524 e->support_ai = val;
525 else if (!strcmp(name, "audio_sync_delay"))
526 e->aud_synch_delay = val;
527 else if (!strcmp(name, "speakers"))
528 e->spk_alloc = val;
529 else if (!strcmp(name, "sad_count"))
530 e->sad_count = val;
531 else if (!strncmp(name, "sad", 3)) {
532 sname = name + 4;
533 n = name[3] - '0';
534 if (name[4] >= '0' && name[4] <= '9') {
535 sname++;
536 n = 10 * n + name[4] - '0';
537 }
538 if (n >= ELD_MAX_SAD)
539 continue;
540 if (!strcmp(sname, "_coding_type"))
541 e->sad[n].format = val;
542 else if (!strcmp(sname, "_channels"))
543 e->sad[n].channels = val;
544 else if (!strcmp(sname, "_rates"))
545 e->sad[n].rates = val;
546 else if (!strcmp(sname, "_bits"))
547 e->sad[n].sample_bits = val;
548 else if (!strcmp(sname, "_max_bitrate"))
549 e->sad[n].max_bitrate = val;
550 else if (!strcmp(sname, "_profile"))
551 e->sad[n].profile = val;
552 if (n >= e->sad_count)
553 e->sad_count = n + 1;
554 }
555 }
556 }
557
558
559 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
560 int index)
561 {
562 char name[32];
563 struct snd_info_entry *entry;
564 int err;
565
566 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
567 err = snd_card_proc_new(codec->bus->card, name, &entry);
568 if (err < 0)
569 return err;
570
571 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
572 entry->c.text.write = hdmi_write_eld_info;
573 entry->mode |= S_IWUSR;
574 eld->proc_entry = entry;
575
576 return 0;
577 }
578
579 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
580 {
581 if (!codec->bus->shutdown && eld->proc_entry) {
582 snd_device_free(codec->bus->card, eld->proc_entry);
583 eld->proc_entry = NULL;
584 }
585 }
586
587 #endif /* CONFIG_PROC_FS */
588
589 /* update PCM info based on ELD */
590 void snd_hdmi_eld_update_pcm_info(struct hdmi_eld *eld,
591 struct hda_pcm_stream *hinfo)
592 {
593 u32 rates;
594 u64 formats;
595 unsigned int maxbps;
596 unsigned int channels_max;
597 int i;
598
599 /* assume basic audio support (the basic audio flag is not in ELD;
600 * however, all audio capable sinks are required to support basic
601 * audio) */
602 rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
603 SNDRV_PCM_RATE_48000;
604 formats = SNDRV_PCM_FMTBIT_S16_LE;
605 maxbps = 16;
606 channels_max = 2;
607 for (i = 0; i < eld->sad_count; i++) {
608 struct cea_sad *a = &eld->sad[i];
609 rates |= a->rates;
610 if (a->channels > channels_max)
611 channels_max = a->channels;
612 if (a->format == AUDIO_CODING_TYPE_LPCM) {
613 if (a->sample_bits & AC_SUPPCM_BITS_20) {
614 formats |= SNDRV_PCM_FMTBIT_S32_LE;
615 if (maxbps < 20)
616 maxbps = 20;
617 }
618 if (a->sample_bits & AC_SUPPCM_BITS_24) {
619 formats |= SNDRV_PCM_FMTBIT_S32_LE;
620 if (maxbps < 24)
621 maxbps = 24;
622 }
623 }
624 }
625
626 /* restrict the parameters by the values the codec provides */
627 hinfo->rates &= rates;
628 hinfo->formats &= formats;
629 hinfo->maxbps = min(hinfo->maxbps, maxbps);
630 hinfo->channels_max = min(hinfo->channels_max, channels_max);
631 }
Linux Btrfs Development