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  * 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 "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] - '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 #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 }