cb0c23a6b473e07bd9d768f9430e7cde2342639c
[linux-2.6.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->format = GRAB_BITS(buf, 0, 3, 4);
193         switch (a->format) {
194         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
195                 snd_printd(KERN_INFO
196                                 "HDMI: audio coding type 0 not expected\n");
197                 break;
198
199         case AUDIO_CODING_TYPE_LPCM:
200                 val = GRAB_BITS(buf, 2, 0, 3);
201                 a->sample_bits = 0;
202                 for (i = 0; i < 3; i++)
203                         if (val & (1 << i))
204                                 a->sample_bits |= cea_sample_sizes[i + 1];
205                 break;
206
207         case AUDIO_CODING_TYPE_AC3:
208         case AUDIO_CODING_TYPE_MPEG1:
209         case AUDIO_CODING_TYPE_MP3:
210         case AUDIO_CODING_TYPE_MPEG2:
211         case AUDIO_CODING_TYPE_AACLC:
212         case AUDIO_CODING_TYPE_DTS:
213         case AUDIO_CODING_TYPE_ATRAC:
214                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
215                 a->max_bitrate *= 8000;
216                 break;
217
218         case AUDIO_CODING_TYPE_SACD:
219                 break;
220
221         case AUDIO_CODING_TYPE_EAC3:
222                 break;
223
224         case AUDIO_CODING_TYPE_DTS_HD:
225                 break;
226
227         case AUDIO_CODING_TYPE_MLP:
228                 break;
229
230         case AUDIO_CODING_TYPE_DST:
231                 break;
232
233         case AUDIO_CODING_TYPE_WMAPRO:
234                 a->profile = GRAB_BITS(buf, 2, 0, 3);
235                 break;
236
237         case AUDIO_CODING_TYPE_REF_CXT:
238                 a->format = GRAB_BITS(buf, 2, 3, 5);
239                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
240                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
241                         snd_printd(KERN_INFO
242                                 "HDMI: audio coding xtype %d not expected\n",
243                                 a->format);
244                         a->format = 0;
245                 } else
246                         a->format += AUDIO_CODING_TYPE_HE_AAC -
247                                      AUDIO_CODING_XTYPE_HE_AAC;
248                 break;
249         }
250 }
251
252 /*
253  * Be careful, ELD buf could be totally rubbish!
254  */
255 static int hdmi_update_eld(struct hdmi_eld *e,
256                            const unsigned char *buf, int size)
257 {
258         int mnl;
259         int i;
260
261         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
262         if (e->eld_ver != ELD_VER_CEA_861D &&
263             e->eld_ver != ELD_VER_PARTIAL) {
264                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
265                                                                 e->eld_ver);
266                 goto out_fail;
267         }
268
269         e->eld_size = size;
270         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
271         mnl             = GRAB_BITS(buf, 4, 0, 5);
272         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
273
274         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
275         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
276         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
277         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
278
279         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
280         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
281
282         e->port_id        = get_unaligned_le64(buf + 8);
283
284         /* not specified, but the spec's tendency is little endian */
285         e->manufacture_id = get_unaligned_le16(buf + 16);
286         e->product_id     = get_unaligned_le16(buf + 18);
287
288         if (mnl > ELD_MAX_MNL) {
289                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
290                 goto out_fail;
291         } else if (ELD_FIXED_BYTES + mnl > size) {
292                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
293                 goto out_fail;
294         } else
295                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
296
297         for (i = 0; i < e->sad_count; i++) {
298                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
299                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
300                         goto out_fail;
301                 }
302                 hdmi_update_short_audio_desc(e->sad + i,
303                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
304         }
305
306         return 0;
307
308 out_fail:
309         e->eld_ver = 0;
310         return -EINVAL;
311 }
312
313 static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
314 {
315         int eldv;
316         int present;
317
318         present = snd_hda_pin_sense(codec, nid);
319         eldv    = (present & AC_PINSENSE_ELDV);
320         present = (present & AC_PINSENSE_PRESENCE);
321
322 #ifdef CONFIG_SND_DEBUG_VERBOSE
323         printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
324                         !!present, !!eldv);
325 #endif
326
327         return eldv && present;
328 }
329
330 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
331 {
332         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
333                                                  AC_DIPSIZE_ELD_BUF);
334 }
335
336 int snd_hdmi_get_eld(struct hdmi_eld *eld,
337                      struct hda_codec *codec, hda_nid_t nid)
338 {
339         int i;
340         int ret;
341         int size;
342         unsigned char *buf;
343
344         if (!hdmi_eld_valid(codec, nid))
345                 return -ENOENT;
346
347         size = snd_hdmi_get_eld_size(codec, nid);
348         if (size == 0) {
349                 /* wfg: workaround for ASUS P5E-VM HDMI board */
350                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
351                 size = 128;
352         }
353         if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
354                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
355                 return -ERANGE;
356         }
357
358         buf = kmalloc(size, GFP_KERNEL);
359         if (!buf)
360                 return -ENOMEM;
361
362         for (i = 0; i < size; i++)
363                 buf[i] = hdmi_get_eld_byte(codec, nid, i);
364
365         ret = hdmi_update_eld(eld, buf, size);
366
367         kfree(buf);
368         return ret;
369 }
370
371 static void hdmi_show_short_audio_desc(struct cea_sad *a)
372 {
373         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
374         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
375
376         if (!a->format)
377                 return;
378
379         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
380
381         if (a->format == AUDIO_CODING_TYPE_LPCM)
382                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
383         else if (a->max_bitrate)
384                 snprintf(buf2, sizeof(buf2),
385                                 ", max bitrate = %d", a->max_bitrate);
386         else
387                 buf2[0] = '\0';
388
389         printk(KERN_INFO "HDMI: supports coding type %s:"
390                         " channels = %d, rates =%s%s\n",
391                         cea_audio_coding_type_names[a->format],
392                         a->channels,
393                         buf,
394                         buf2);
395 }
396
397 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
398 {
399         int i, j;
400
401         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
402                 if (spk_alloc & (1 << i))
403                         j += snprintf(buf + j, buflen - j,  " %s",
404                                         cea_speaker_allocation_names[i]);
405         }
406         buf[j] = '\0';  /* necessary when j == 0 */
407 }
408
409 void snd_hdmi_show_eld(struct hdmi_eld *e)
410 {
411         int i;
412
413         printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
414                         e->monitor_name,
415                         eld_connection_type_names[e->conn_type]);
416
417         if (e->spk_alloc) {
418                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
419                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
420                 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
421         }
422
423         for (i = 0; i < e->sad_count; i++)
424                 hdmi_show_short_audio_desc(e->sad + i);
425 }
426
427 #ifdef CONFIG_PROC_FS
428
429 static void hdmi_print_sad_info(int i, struct cea_sad *a,
430                                 struct snd_info_buffer *buffer)
431 {
432         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
433
434         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
435                         i, a->format, cea_audio_coding_type_names[a->format]);
436         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
437
438         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
439         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
440
441         if (a->format == AUDIO_CODING_TYPE_LPCM) {
442                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
443                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
444                                                         i, a->sample_bits, buf);
445         }
446
447         if (a->max_bitrate)
448                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
449                                                         i, a->max_bitrate);
450
451         if (a->profile)
452                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
453 }
454
455 static void hdmi_print_eld_info(struct snd_info_entry *entry,
456                                 struct snd_info_buffer *buffer)
457 {
458         struct hdmi_eld *e = entry->private_data;
459         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
460         int i;
461         static char *eld_versoin_names[32] = {
462                 "reserved",
463                 "reserved",
464                 "CEA-861D or below",
465                 [3 ... 30] = "reserved",
466                 [31] = "partial"
467         };
468         static char *cea_edid_version_names[8] = {
469                 "no CEA EDID Timing Extension block present",
470                 "CEA-861",
471                 "CEA-861-A",
472                 "CEA-861-B, C or D",
473                 [4 ... 7] = "reserved"
474         };
475
476         snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
477         snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
478         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
479         snd_iprintf(buffer, "connection_type\t\t%s\n",
480                                 eld_connection_type_names[e->conn_type]);
481         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
482                                         eld_versoin_names[e->eld_ver]);
483         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
484                                 cea_edid_version_names[e->cea_edid_ver]);
485         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
486         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
487         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
488         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
489         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
490         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
491
492         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
493         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
494
495         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
496
497         for (i = 0; i < e->sad_count; i++)
498                 hdmi_print_sad_info(i, e->sad + i, buffer);
499 }
500
501 static void hdmi_write_eld_info(struct snd_info_entry *entry,
502                                 struct snd_info_buffer *buffer)
503 {
504         struct hdmi_eld *e = entry->private_data;
505         char line[64];
506         char name[64];
507         char *sname;
508         long long val;
509         unsigned int n;
510
511         while (!snd_info_get_line(buffer, line, sizeof(line))) {
512                 if (sscanf(line, "%s %llx", name, &val) != 2)
513                         continue;
514                 /*
515                  * We don't allow modification to these fields:
516                  *      monitor_name manufacture_id product_id
517                  *      eld_version edid_version
518                  */
519                 if (!strcmp(name, "monitor_present"))
520                         e->monitor_present = val;
521                 else if (!strcmp(name, "eld_valid"))
522                         e->eld_valid = val;
523                 else if (!strcmp(name, "connection_type"))
524                         e->conn_type = val;
525                 else if (!strcmp(name, "port_id"))
526                         e->port_id = val;
527                 else if (!strcmp(name, "support_hdcp"))
528                         e->support_hdcp = val;
529                 else if (!strcmp(name, "support_ai"))
530                         e->support_ai = val;
531                 else if (!strcmp(name, "audio_sync_delay"))
532                         e->aud_synch_delay = val;
533                 else if (!strcmp(name, "speakers"))
534                         e->spk_alloc = val;
535                 else if (!strcmp(name, "sad_count"))
536                         e->sad_count = val;
537                 else if (!strncmp(name, "sad", 3)) {
538                         sname = name + 4;
539                         n = name[3] - '0';
540                         if (name[4] >= '0' && name[4] <= '9') {
541                                 sname++;
542                                 n = 10 * n + name[4] - '0';
543                         }
544                         if (n >= ELD_MAX_SAD)
545                                 continue;
546                         if (!strcmp(sname, "_coding_type"))
547                                 e->sad[n].format = val;
548                         else if (!strcmp(sname, "_channels"))
549                                 e->sad[n].channels = val;
550                         else if (!strcmp(sname, "_rates"))
551                                 e->sad[n].rates = val;
552                         else if (!strcmp(sname, "_bits"))
553                                 e->sad[n].sample_bits = val;
554                         else if (!strcmp(sname, "_max_bitrate"))
555                                 e->sad[n].max_bitrate = val;
556                         else if (!strcmp(sname, "_profile"))
557                                 e->sad[n].profile = val;
558                         if (n >= e->sad_count)
559                                 e->sad_count = n + 1;
560                 }
561         }
562 }
563
564
565 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
566                          int index)
567 {
568         char name[32];
569         struct snd_info_entry *entry;
570         int err;
571
572         snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
573         err = snd_card_proc_new(codec->bus->card, name, &entry);
574         if (err < 0)
575                 return err;
576
577         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
578         entry->c.text.write = hdmi_write_eld_info;
579         entry->mode |= S_IWUSR;
580         eld->proc_entry = entry;
581
582         return 0;
583 }
584
585 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
586 {
587         if (!codec->bus->shutdown && eld->proc_entry) {
588                 snd_device_free(codec->bus->card, eld->proc_entry);
589                 eld->proc_entry = NULL;
590         }
591 }
592
593 #endif /* CONFIG_PROC_FS */
594
595 /* update PCM info based on ELD */
596 void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
597                               struct hda_pcm_stream *codec_pars)
598 {
599         int i;
600
601         pcm->rates = 0;
602         pcm->formats = 0;
603         pcm->maxbps = 0;
604         pcm->channels_min = -1;
605         pcm->channels_max = 0;
606         for (i = 0; i < eld->sad_count; i++) {
607                 struct cea_sad *a = &eld->sad[i];
608                 pcm->rates |= a->rates;
609                 if (a->channels < pcm->channels_min)
610                         pcm->channels_min = a->channels;
611                 if (a->channels > pcm->channels_max)
612                         pcm->channels_max = a->channels;
613                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
614                         if (a->sample_bits & AC_SUPPCM_BITS_16) {
615                                 pcm->formats |= SNDRV_PCM_FMTBIT_S16_LE;
616                                 if (pcm->maxbps < 16)
617                                         pcm->maxbps = 16;
618                         }
619                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
620                                 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
621                                 if (pcm->maxbps < 20)
622                                         pcm->maxbps = 20;
623                         }
624                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
625                                 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
626                                 if (pcm->maxbps < 24)
627                                         pcm->maxbps = 24;
628                         }
629                 }
630         }
631
632         if (!codec_pars)
633                 return;
634
635         /* restrict the parameters by the values the codec provides */
636         pcm->rates &= codec_pars->rates;
637         pcm->formats &= codec_pars->formats;
638         pcm->channels_min = max(pcm->channels_min, codec_pars->channels_min);
639         pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max);
640         pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps);
641 }