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TOMOYO Linux Cross Reference
Linux/sound/pci/hda/hda_eld.c

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  1 /*
  2  * Generic routines and proc interface for ELD(EDID Like Data) information
  3  *
  4  * Copyright(c) 2008 Intel Corporation.
  5  * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi>
  6  *
  7  * Authors:
  8  *              Wu Fengguang <wfg@linux.intel.com>
  9  *
 10  *  This driver is free software; you can redistribute it and/or modify
 11  *  it under the terms of the GNU General Public License as published by
 12  *  the Free Software Foundation; either version 2 of the License, or
 13  *  (at your option) any later version.
 14  *
 15  *  This driver is distributed in the hope that it will be useful,
 16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  *  GNU General Public License for more details.
 19  *
 20  *  You should have received a copy of the GNU General Public License
 21  *  along with this program; if not, write to the Free Software
 22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/slab.h>
 27 #include <sound/core.h>
 28 #include <asm/unaligned.h>
 29 #include <sound/hda_chmap.h>
 30 #include <sound/hda_codec.h>
 31 #include "hda_local.h"
 32 
 33 enum eld_versions {
 34         ELD_VER_CEA_861D        = 2,
 35         ELD_VER_PARTIAL         = 31,
 36 };
 37 
 38 enum cea_edid_versions {
 39         CEA_EDID_VER_NONE       = 0,
 40         CEA_EDID_VER_CEA861     = 1,
 41         CEA_EDID_VER_CEA861A    = 2,
 42         CEA_EDID_VER_CEA861BCD  = 3,
 43         CEA_EDID_VER_RESERVED   = 4,
 44 };
 45 
 46 static const char * const eld_connection_type_names[4] = {
 47         "HDMI",
 48         "DisplayPort",
 49         "2-reserved",
 50         "3-reserved"
 51 };
 52 
 53 enum cea_audio_coding_types {
 54         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
 55         AUDIO_CODING_TYPE_LPCM                  =  1,
 56         AUDIO_CODING_TYPE_AC3                   =  2,
 57         AUDIO_CODING_TYPE_MPEG1                 =  3,
 58         AUDIO_CODING_TYPE_MP3                   =  4,
 59         AUDIO_CODING_TYPE_MPEG2                 =  5,
 60         AUDIO_CODING_TYPE_AACLC                 =  6,
 61         AUDIO_CODING_TYPE_DTS                   =  7,
 62         AUDIO_CODING_TYPE_ATRAC                 =  8,
 63         AUDIO_CODING_TYPE_SACD                  =  9,
 64         AUDIO_CODING_TYPE_EAC3                  = 10,
 65         AUDIO_CODING_TYPE_DTS_HD                = 11,
 66         AUDIO_CODING_TYPE_MLP                   = 12,
 67         AUDIO_CODING_TYPE_DST                   = 13,
 68         AUDIO_CODING_TYPE_WMAPRO                = 14,
 69         AUDIO_CODING_TYPE_REF_CXT               = 15,
 70         /* also include valid xtypes below */
 71         AUDIO_CODING_TYPE_HE_AAC                = 15,
 72         AUDIO_CODING_TYPE_HE_AAC2               = 16,
 73         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
 74 };
 75 
 76 enum cea_audio_coding_xtypes {
 77         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
 78         AUDIO_CODING_XTYPE_HE_AAC               = 1,
 79         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
 80         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
 81         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
 82 };
 83 
 84 static const char * const cea_audio_coding_type_names[] = {
 85         /*  0 */ "undefined",
 86         /*  1 */ "LPCM",
 87         /*  2 */ "AC-3",
 88         /*  3 */ "MPEG1",
 89         /*  4 */ "MP3",
 90         /*  5 */ "MPEG2",
 91         /*  6 */ "AAC-LC",
 92         /*  7 */ "DTS",
 93         /*  8 */ "ATRAC",
 94         /*  9 */ "DSD (One Bit Audio)",
 95         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
 96         /* 11 */ "DTS-HD",
 97         /* 12 */ "MLP (Dolby TrueHD)",
 98         /* 13 */ "DST",
 99         /* 14 */ "WMAPro",
100         /* 15 */ "HE-AAC",
101         /* 16 */ "HE-AACv2",
102         /* 17 */ "MPEG Surround",
103 };
104 
105 /*
106  * The following two lists are shared between
107  *      - HDMI audio InfoFrame (source to sink)
108  *      - CEA E-EDID Extension (sink to source)
109  */
110 
111 /*
112  * SS1:SS0 index => sample size
113  */
114 static int cea_sample_sizes[4] = {
115         0,                      /* 0: Refer to Stream Header */
116         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
117         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
118         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
119 };
120 
121 /*
122  * SF2:SF1:SF0 index => sampling frequency
123  */
124 static int cea_sampling_frequencies[8] = {
125         0,                      /* 0: Refer to Stream Header */
126         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
127         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
128         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
129         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
130         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
131         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
132         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
133 };
134 
135 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
136                                         int byte_index)
137 {
138         unsigned int val;
139 
140         val = snd_hda_codec_read(codec, nid, 0,
141                                         AC_VERB_GET_HDMI_ELDD, byte_index);
142 #ifdef BE_PARANOID
143         codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
144 #endif
145         return val;
146 }
147 
148 #define GRAB_BITS(buf, byte, lowbit, bits)              \
149 ({                                                      \
150         BUILD_BUG_ON(lowbit > 7);                       \
151         BUILD_BUG_ON(bits > 8);                         \
152         BUILD_BUG_ON(bits <= 0);                        \
153                                                         \
154         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
155 })
156 
157 static void hdmi_update_short_audio_desc(struct hda_codec *codec,
158                                          struct cea_sad *a,
159                                          const unsigned char *buf)
160 {
161         int i;
162         int val;
163 
164         val = GRAB_BITS(buf, 1, 0, 7);
165         a->rates = 0;
166         for (i = 0; i < 7; i++)
167                 if (val & (1 << i))
168                         a->rates |= cea_sampling_frequencies[i + 1];
169 
170         a->channels = GRAB_BITS(buf, 0, 0, 3);
171         a->channels++;
172 
173         a->sample_bits = 0;
174         a->max_bitrate = 0;
175 
176         a->format = GRAB_BITS(buf, 0, 3, 4);
177         switch (a->format) {
178         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
179                 codec_info(codec, "HDMI: audio coding type 0 not expected\n");
180                 break;
181 
182         case AUDIO_CODING_TYPE_LPCM:
183                 val = GRAB_BITS(buf, 2, 0, 3);
184                 for (i = 0; i < 3; i++)
185                         if (val & (1 << i))
186                                 a->sample_bits |= cea_sample_sizes[i + 1];
187                 break;
188 
189         case AUDIO_CODING_TYPE_AC3:
190         case AUDIO_CODING_TYPE_MPEG1:
191         case AUDIO_CODING_TYPE_MP3:
192         case AUDIO_CODING_TYPE_MPEG2:
193         case AUDIO_CODING_TYPE_AACLC:
194         case AUDIO_CODING_TYPE_DTS:
195         case AUDIO_CODING_TYPE_ATRAC:
196                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
197                 a->max_bitrate *= 8000;
198                 break;
199 
200         case AUDIO_CODING_TYPE_SACD:
201                 break;
202 
203         case AUDIO_CODING_TYPE_EAC3:
204                 break;
205 
206         case AUDIO_CODING_TYPE_DTS_HD:
207                 break;
208 
209         case AUDIO_CODING_TYPE_MLP:
210                 break;
211 
212         case AUDIO_CODING_TYPE_DST:
213                 break;
214 
215         case AUDIO_CODING_TYPE_WMAPRO:
216                 a->profile = GRAB_BITS(buf, 2, 0, 3);
217                 break;
218 
219         case AUDIO_CODING_TYPE_REF_CXT:
220                 a->format = GRAB_BITS(buf, 2, 3, 5);
221                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
222                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
223                         codec_info(codec,
224                                    "HDMI: audio coding xtype %d not expected\n",
225                                    a->format);
226                         a->format = 0;
227                 } else
228                         a->format += AUDIO_CODING_TYPE_HE_AAC -
229                                      AUDIO_CODING_XTYPE_HE_AAC;
230                 break;
231         }
232 }
233 
234 /*
235  * Be careful, ELD buf could be totally rubbish!
236  */
237 int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
238                           const unsigned char *buf, int size)
239 {
240         int mnl;
241         int i;
242 
243         memset(e, 0, sizeof(*e));
244         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
245         if (e->eld_ver != ELD_VER_CEA_861D &&
246             e->eld_ver != ELD_VER_PARTIAL) {
247                 codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
248                 goto out_fail;
249         }
250 
251         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
252         mnl             = GRAB_BITS(buf, 4, 0, 5);
253         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
254 
255         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
256         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
257         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
258         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
259 
260         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
261         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
262 
263         e->port_id        = get_unaligned_le64(buf + 8);
264 
265         /* not specified, but the spec's tendency is little endian */
266         e->manufacture_id = get_unaligned_le16(buf + 16);
267         e->product_id     = get_unaligned_le16(buf + 18);
268 
269         if (mnl > ELD_MAX_MNL) {
270                 codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
271                 goto out_fail;
272         } else if (ELD_FIXED_BYTES + mnl > size) {
273                 codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
274                 goto out_fail;
275         } else
276                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
277 
278         for (i = 0; i < e->sad_count; i++) {
279                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
280                         codec_info(codec, "HDMI: out of range SAD %d\n", i);
281                         goto out_fail;
282                 }
283                 hdmi_update_short_audio_desc(codec, e->sad + i,
284                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
285         }
286 
287         /*
288          * HDMI sink's ELD info cannot always be retrieved for now, e.g.
289          * in console or for audio devices. Assume the highest speakers
290          * configuration, to _not_ prohibit multi-channel audio playback.
291          */
292         if (!e->spk_alloc)
293                 e->spk_alloc = 0xffff;
294 
295         return 0;
296 
297 out_fail:
298         return -EINVAL;
299 }
300 
301 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
302 {
303         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
304                                                  AC_DIPSIZE_ELD_BUF);
305 }
306 
307 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
308                      unsigned char *buf, int *eld_size)
309 {
310         int i;
311         int ret = 0;
312         int size;
313 
314         /*
315          * ELD size is initialized to zero in caller function. If no errors and
316          * ELD is valid, actual eld_size is assigned.
317          */
318 
319         size = snd_hdmi_get_eld_size(codec, nid);
320         if (size == 0) {
321                 /* wfg: workaround for ASUS P5E-VM HDMI board */
322                 codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
323                 size = 128;
324         }
325         if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
326                 codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
327                 return -ERANGE;
328         }
329 
330         /* set ELD buffer */
331         for (i = 0; i < size; i++) {
332                 unsigned int val = hdmi_get_eld_data(codec, nid, i);
333                 /*
334                  * Graphics driver might be writing to ELD buffer right now.
335                  * Just abort. The caller will repoll after a while.
336                  */
337                 if (!(val & AC_ELDD_ELD_VALID)) {
338                         codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
339                         ret = -EINVAL;
340                         goto error;
341                 }
342                 val &= AC_ELDD_ELD_DATA;
343                 /*
344                  * The first byte cannot be zero. This can happen on some DVI
345                  * connections. Some Intel chips may also need some 250ms delay
346                  * to return non-zero ELD data, even when the graphics driver
347                  * correctly writes ELD content before setting ELD_valid bit.
348                  */
349                 if (!val && !i) {
350                         codec_dbg(codec, "HDMI: 0 ELD data\n");
351                         ret = -EINVAL;
352                         goto error;
353                 }
354                 buf[i] = val;
355         }
356 
357         *eld_size = size;
358 error:
359         return ret;
360 }
361 
362 /*
363  * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
364  * hdmi-specific routine.
365  */
366 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
367 {
368         static unsigned int alsa_rates[] = {
369                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
370                 88200, 96000, 176400, 192000, 384000
371         };
372         int i, j;
373 
374         for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
375                 if (pcm & (1 << i))
376                         j += snprintf(buf + j, buflen - j,  " %d",
377                                 alsa_rates[i]);
378 
379         buf[j] = '\0'; /* necessary when j == 0 */
380 }
381 
382 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80
383 
384 static void hdmi_show_short_audio_desc(struct hda_codec *codec,
385                                        struct cea_sad *a)
386 {
387         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
388         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
389 
390         if (!a->format)
391                 return;
392 
393         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
394 
395         if (a->format == AUDIO_CODING_TYPE_LPCM)
396                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
397         else if (a->max_bitrate)
398                 snprintf(buf2, sizeof(buf2),
399                                 ", max bitrate = %d", a->max_bitrate);
400         else
401                 buf2[0] = '\0';
402 
403         codec_dbg(codec,
404                   "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
405                   cea_audio_coding_type_names[a->format],
406                   a->channels, buf, buf2);
407 }
408 
409 void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
410 {
411         int i;
412 
413         codec_dbg(codec, "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_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
420                 codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
421         }
422 
423         for (i = 0; i < e->sad_count; i++)
424                 hdmi_show_short_audio_desc(codec, e->sad + i);
425 }
426 
427 #ifdef CONFIG_SND_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         hdmi_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 void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
456                              struct snd_info_buffer *buffer)
457 {
458         struct parsed_hdmi_eld *e = &eld->info;
459         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
460         int i;
461         static const char * const eld_version_names[32] = {
462                 "reserved",
463                 "reserved",
464                 "CEA-861D or below",
465                 [3 ... 30] = "reserved",
466                 [31] = "partial"
467         };
468         static const char * const 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", eld->monitor_present);
477         snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
478         if (!eld->eld_valid)
479                 return;
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_version_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_hdac_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 void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
504                              struct snd_info_buffer *buffer)
505 {
506         struct parsed_hdmi_eld *e = &eld->info;
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                         eld->monitor_present = val;
523                 else if (!strcmp(name, "eld_valid"))
524                         eld->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] - '';
542                         if (name[4] >= '' && name[4] <= '9') {
543                                 sname++;
544                                 n = 10 * n + name[4] - '';
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 #endif /* CONFIG_SND_PROC_FS */
566 
567 /* update PCM info based on ELD */
568 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
569                               struct hda_pcm_stream *hinfo)
570 {
571         u32 rates;
572         u64 formats;
573         unsigned int maxbps;
574         unsigned int channels_max;
575         int i;
576 
577         /* assume basic audio support (the basic audio flag is not in ELD;
578          * however, all audio capable sinks are required to support basic
579          * audio) */
580         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
581                 SNDRV_PCM_RATE_48000;
582         formats = SNDRV_PCM_FMTBIT_S16_LE;
583         maxbps = 16;
584         channels_max = 2;
585         for (i = 0; i < e->sad_count; i++) {
586                 struct cea_sad *a = &e->sad[i];
587                 rates |= a->rates;
588                 if (a->channels > channels_max)
589                         channels_max = a->channels;
590                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
591                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
592                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
593                                 if (maxbps < 20)
594                                         maxbps = 20;
595                         }
596                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
597                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
598                                 if (maxbps < 24)
599                                         maxbps = 24;
600                         }
601                 }
602         }
603 
604         /* restrict the parameters by the values the codec provides */
605         hinfo->rates &= rates;
606         hinfo->formats &= formats;
607         hinfo->maxbps = min(hinfo->maxbps, maxbps);
608         hinfo->channels_max = min(hinfo->channels_max, channels_max);
609 }
610 
611 
612 /* ATI/AMD specific stuff (ELD emulation) */
613 
614 #define ATI_VERB_SET_AUDIO_DESCRIPTOR   0x776
615 #define ATI_VERB_SET_SINK_INFO_INDEX    0x780
616 #define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70
617 #define ATI_VERB_GET_AUDIO_DESCRIPTOR   0xf76
618 #define ATI_VERB_GET_AUDIO_VIDEO_DELAY  0xf7b
619 #define ATI_VERB_GET_SINK_INFO_INDEX    0xf80
620 #define ATI_VERB_GET_SINK_INFO_DATA     0xf81
621 
622 #define ATI_SPKALLOC_SPKALLOC           0x007f
623 #define ATI_SPKALLOC_TYPE_HDMI          0x0100
624 #define ATI_SPKALLOC_TYPE_DISPLAYPORT   0x0200
625 
626 /* first three bytes are just standard SAD */
627 #define ATI_AUDIODESC_CHANNELS          0x00000007
628 #define ATI_AUDIODESC_RATES             0x0000ff00
629 #define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000
630 
631 /* in standard HDMI VSDB format */
632 #define ATI_DELAY_VIDEO_LATENCY         0x000000ff
633 #define ATI_DELAY_AUDIO_LATENCY         0x0000ff00
634 
635 enum ati_sink_info_idx {
636         ATI_INFO_IDX_MANUFACTURER_ID    = 0,
637         ATI_INFO_IDX_PRODUCT_ID         = 1,
638         ATI_INFO_IDX_SINK_DESC_LEN      = 2,
639         ATI_INFO_IDX_PORT_ID_LOW        = 3,
640         ATI_INFO_IDX_PORT_ID_HIGH       = 4,
641         ATI_INFO_IDX_SINK_DESC_FIRST    = 5,
642         ATI_INFO_IDX_SINK_DESC_LAST     = 22, /* max len 18 bytes */
643 };
644 
645 int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
646                          unsigned char *buf, int *eld_size, bool rev3_or_later)
647 {
648         int spkalloc, ati_sad, aud_synch;
649         int sink_desc_len = 0;
650         int pos, i;
651 
652         /* ATI/AMD does not have ELD, emulate it */
653 
654         spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);
655 
656         if (spkalloc <= 0) {
657                 codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
658                 return -EINVAL;
659         }
660 
661         memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);
662 
663         /* version */
664         buf[0] = ELD_VER_CEA_861D << 3;
665 
666         /* speaker allocation from EDID */
667         buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;
668 
669         /* is DisplayPort? */
670         if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
671                 buf[5] |= 0x04;
672 
673         pos = ELD_FIXED_BYTES;
674 
675         if (rev3_or_later) {
676                 int sink_info;
677 
678                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
679                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
680                 put_unaligned_le32(sink_info, buf + 8);
681 
682                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
683                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
684                 put_unaligned_le32(sink_info, buf + 12);
685 
686                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
687                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
688                 put_unaligned_le16(sink_info, buf + 16);
689 
690                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
691                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
692                 put_unaligned_le16(sink_info, buf + 18);
693 
694                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
695                 sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
696 
697                 if (sink_desc_len > ELD_MAX_MNL) {
698                         codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
699                                    sink_desc_len);
700                         sink_desc_len = ELD_MAX_MNL;
701                 }
702 
703                 buf[4] |= sink_desc_len;
704 
705                 for (i = 0; i < sink_desc_len; i++) {
706                         snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
707                         buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
708                 }
709         }
710 
711         for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
712                 if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
713                         continue; /* not handled by ATI/AMD */
714 
715                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
716                 ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);
717 
718                 if (ati_sad <= 0)
719                         continue;
720 
721                 if (ati_sad & ATI_AUDIODESC_RATES) {
722                         /* format is supported, copy SAD as-is */
723                         buf[pos++] = (ati_sad & 0x0000ff) >> 0;
724                         buf[pos++] = (ati_sad & 0x00ff00) >> 8;
725                         buf[pos++] = (ati_sad & 0xff0000) >> 16;
726                 }
727 
728                 if (i == AUDIO_CODING_TYPE_LPCM
729                     && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
730                     && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
731                         /* for PCM there is a separate stereo rate mask */
732                         buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
733                         /* rates from the extra byte */
734                         buf[pos++] = (ati_sad & 0xff000000) >> 24;
735                         buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
736                 }
737         }
738 
739         if (pos == ELD_FIXED_BYTES + sink_desc_len) {
740                 codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
741                 return -EINVAL;
742         }
743 
744         /*
745          * HDMI VSDB latency format:
746          * separately for both audio and video:
747          *  0          field not valid or unknown latency
748          *  [1..251]   msecs = (x-1)*2  (max 500ms with x = 251 = 0xfb)
749          *  255        audio/video not supported
750          *
751          * HDA latency format:
752          * single value indicating video latency relative to audio:
753          *  0          unknown or 0ms
754          *  [1..250]   msecs = x*2  (max 500ms with x = 250 = 0xfa)
755          *  [251..255] reserved
756          */
757         aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
758         if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
759                 int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
760                 int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;
761 
762                 if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
763                     video_latency_hdmi > audio_latency_hdmi)
764                         buf[6] = video_latency_hdmi - audio_latency_hdmi;
765                 /* else unknown/invalid or 0ms or video ahead of audio, so use zero */
766         }
767 
768         /* SAD count */
769         buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
770 
771         /* Baseline ELD block length is 4-byte aligned */
772         pos = round_up(pos, 4);
773 
774         /* Baseline ELD length (4-byte header is not counted in) */
775         buf[2] = (pos - 4) / 4;
776 
777         *eld_size = pos;
778 
779         return 0;
780 }
781 

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