kernel/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 "hda_codec.h"
  30 #include "hda_local.h"
  31
  32 enum eld_versions {
  33         ELD_VER_CEA_861D        = 2,
  34         ELD_VER_PARTIAL         = 31,
  35 };
  36
  37 enum cea_edid_versions {
  38         CEA_EDID_VER_NONE       = 0,
  39         CEA_EDID_VER_CEA861     = 1,
  40         CEA_EDID_VER_CEA861A    = 2,
  41         CEA_EDID_VER_CEA861BCD  = 3,
  42         CEA_EDID_VER_RESERVED   = 4,
  43 };
  44
  45 static char *cea_speaker_allocation_names[] = {
  46         /*  0 */ "FL/FR",
  47         /*  1 */ "LFE",
  48         /*  2 */ "FC",
  49         /*  3 */ "RL/RR",
  50         /*  4 */ "RC",
  51         /*  5 */ "FLC/FRC",
  52         /*  6 */ "RLC/RRC",
  53         /*  7 */ "FLW/FRW",
  54         /*  8 */ "FLH/FRH",
  55         /*  9 */ "TC",
  56         /* 10 */ "FCH",
  57 };
  58
  59 static char *eld_connection_type_names[4] = {
  60         "HDMI",
  61         "DisplayPort",
  62         "2-reserved",
  63         "3-reserved"
  64 };
  65
  66 enum cea_audio_coding_types {
  67         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
  68         AUDIO_CODING_TYPE_LPCM                  =  1,
  69         AUDIO_CODING_TYPE_AC3                   =  2,
  70         AUDIO_CODING_TYPE_MPEG1                 =  3,
  71         AUDIO_CODING_TYPE_MP3                   =  4,
  72         AUDIO_CODING_TYPE_MPEG2                 =  5,
  73         AUDIO_CODING_TYPE_AACLC                 =  6,
  74         AUDIO_CODING_TYPE_DTS                   =  7,
  75         AUDIO_CODING_TYPE_ATRAC                 =  8,
  76         AUDIO_CODING_TYPE_SACD                  =  9,
  77         AUDIO_CODING_TYPE_EAC3                  = 10,
  78         AUDIO_CODING_TYPE_DTS_HD                = 11,
  79         AUDIO_CODING_TYPE_MLP                   = 12,
  80         AUDIO_CODING_TYPE_DST                   = 13,
  81         AUDIO_CODING_TYPE_WMAPRO                = 14,
  82         AUDIO_CODING_TYPE_REF_CXT               = 15,
  83         /* also include valid xtypes below */
  84         AUDIO_CODING_TYPE_HE_AAC                = 15,
  85         AUDIO_CODING_TYPE_HE_AAC2               = 16,
  86         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
  87 };
  88
  89 enum cea_audio_coding_xtypes {
  90         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
  91         AUDIO_CODING_XTYPE_HE_AAC               = 1,
  92         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
  93         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
  94         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
  95 };
  96
  97 static char *cea_audio_coding_type_names[] = {
  98         /*  0 */ "undefined",
  99         /*  1 */ "LPCM",
 100         /*  2 */ "AC-3",
 101         /*  3 */ "MPEG1",
 102         /*  4 */ "MP3",
 103         /*  5 */ "MPEG2",
 104         /*  6 */ "AAC-LC",
 105         /*  7 */ "DTS",
 106         /*  8 */ "ATRAC",
 107         /*  9 */ "DSD (One Bit Audio)",
 108         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
 109         /* 11 */ "DTS-HD",
 110         /* 12 */ "MLP (Dolby TrueHD)",
 111         /* 13 */ "DST",
 112         /* 14 */ "WMAPro",
 113         /* 15 */ "HE-AAC",
 114         /* 16 */ "HE-AACv2",
 115         /* 17 */ "MPEG Surround",
 116 };
 117
 118 /*
 119  * The following two lists are shared between
 120  *      - HDMI audio InfoFrame (source to sink)
 121  *      - CEA E-EDID Extension (sink to source)
 122  */
 123
 124 /*
 125  * SS1:SS0 index => sample size
 126  */
 127 static int cea_sample_sizes[4] = {
 128         0,                      /* 0: Refer to Stream Header */
 129         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
 130         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
 131         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
 132 };
 133
 134 /*
 135  * SF2:SF1:SF0 index => sampling frequency
 136  */
 137 static int cea_sampling_frequencies[8] = {
 138         0,                      /* 0: Refer to Stream Header */
 139         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
 140         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
 141         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
 142         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
 143         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
 144         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
 145         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
 146 };
 147
 148 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
 149                                         int byte_index)
 150 {
 151         unsigned int val;
 152
 153         val = snd_hda_codec_read(codec, nid, 0,
 154                                         AC_VERB_GET_HDMI_ELDD, byte_index);
 155 #ifdef BE_PARANOID
 156         codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 157 #endif
 158         return val;
 159 }
 160
 161 #define GRAB_BITS(buf, byte, lowbit, bits)              \
 162 ({                                                      \
 163         BUILD_BUG_ON(lowbit > 7);                       \
 164         BUILD_BUG_ON(bits > 8);                         \
 165         BUILD_BUG_ON(bits <= 0);                        \
 166                                                         \
 167         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 168 })
 169
 170 static void hdmi_update_short_audio_desc(struct hda_codec *codec,
 171                                          struct cea_sad *a,
 172                                          const unsigned char *buf)
 173 {
 174         int i;
 175         int val;
 176
 177         val = GRAB_BITS(buf, 1, 0, 7);
 178         a->rates = 0;
 179         for (i = 0; i < 7; i++)
 180                 if (val & (1 << i))
 181                         a->rates |= cea_sampling_frequencies[i + 1];
 182
 183         a->channels = GRAB_BITS(buf, 0, 0, 3);
 184         a->channels++;
 185
 186         a->sample_bits = 0;
 187         a->max_bitrate = 0;
 188
 189         a->format = GRAB_BITS(buf, 0, 3, 4);
 190         switch (a->format) {
 191         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 192                 codec_info(codec, "HDMI: audio coding type 0 not expected\n");
 193                 break;
 194
 195         case AUDIO_CODING_TYPE_LPCM:
 196                 val = GRAB_BITS(buf, 2, 0, 3);
 197                 for (i = 0; i < 3; i++)
 198                         if (val & (1 << i))
 199                                 a->sample_bits |= cea_sample_sizes[i + 1];
 200                 break;
 201
 202         case AUDIO_CODING_TYPE_AC3:
 203         case AUDIO_CODING_TYPE_MPEG1:
 204         case AUDIO_CODING_TYPE_MP3:
 205         case AUDIO_CODING_TYPE_MPEG2:
 206         case AUDIO_CODING_TYPE_AACLC:
 207         case AUDIO_CODING_TYPE_DTS:
 208         case AUDIO_CODING_TYPE_ATRAC:
 209                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 210                 a->max_bitrate *= 8000;
 211                 break;
 212
 213         case AUDIO_CODING_TYPE_SACD:
 214                 break;
 215
 216         case AUDIO_CODING_TYPE_EAC3:
 217                 break;
 218
 219         case AUDIO_CODING_TYPE_DTS_HD:
 220                 break;
 221
 222         case AUDIO_CODING_TYPE_MLP:
 223                 break;
 224
 225         case AUDIO_CODING_TYPE_DST:
 226                 break;
 227
 228         case AUDIO_CODING_TYPE_WMAPRO:
 229                 a->profile = GRAB_BITS(buf, 2, 0, 3);
 230                 break;
 231
 232         case AUDIO_CODING_TYPE_REF_CXT:
 233                 a->format = GRAB_BITS(buf, 2, 3, 5);
 234                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 235                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 236                         codec_info(codec,
 237                                    "HDMI: audio coding xtype %d not expected\n",
 238                                    a->format);
 239                         a->format = 0;
 240                 } else
 241                         a->format += AUDIO_CODING_TYPE_HE_AAC -
 242                                      AUDIO_CODING_XTYPE_HE_AAC;
 243                 break;
 244         }
 245 }
 246
 247 /*
 248  * Be careful, ELD buf could be totally rubbish!
 249  */
 250 int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
 251                           const unsigned char *buf, int size)
 252 {
 253         int mnl;
 254         int i;
 255
 256         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 257         if (e->eld_ver != ELD_VER_CEA_861D &&
 258             e->eld_ver != ELD_VER_PARTIAL) {
 259                 codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
 260                 goto out_fail;
 261         }
 262
 263         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 264         mnl             = GRAB_BITS(buf, 4, 0, 5);
 265         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 266
 267         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 268         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 269         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 270         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 271
 272         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 273         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 274
 275         e->port_id        = get_unaligned_le64(buf + 8);
 276
 277         /* not specified, but the spec's tendency is little endian */
 278         e->manufacture_id = get_unaligned_le16(buf + 16);
 279         e->product_id     = get_unaligned_le16(buf + 18);
 280
 281         if (mnl > ELD_MAX_MNL) {
 282                 codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
 283                 goto out_fail;
 284         } else if (ELD_FIXED_BYTES + mnl > size) {
 285                 codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
 286                 goto out_fail;
 287         } else
 288                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
 289
 290         for (i = 0; i < e->sad_count; i++) {
 291                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 292                         codec_info(codec, "HDMI: out of range SAD %d\n", i);
 293                         goto out_fail;
 294                 }
 295                 hdmi_update_short_audio_desc(codec, e->sad + i,
 296                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 297         }
 298
 299         /*
 300          * HDMI sink's ELD info cannot always be retrieved for now, e.g.
 301          * in console or for audio devices. Assume the highest speakers
 302          * configuration, to _not_ prohibit multi-channel audio playback.
 303          */
 304         if (!e->spk_alloc)
 305                 e->spk_alloc = 0xffff;
 306
 307         return 0;
 308
 309 out_fail:
 310         return -EINVAL;
 311 }
 312
 313 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 314 {
 315         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 316                                                  AC_DIPSIZE_ELD_BUF);
 317 }
 318
 319 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
 320                      unsigned char *buf, int *eld_size)
 321 {
 322         int i;
 323         int ret = 0;
 324         int size;
 325
 326         /*
 327          * ELD size is initialized to zero in caller function. If no errors and
 328          * ELD is valid, actual eld_size is assigned.
 329          */
 330
 331         size = snd_hdmi_get_eld_size(codec, nid);
 332         if (size == 0) {
 333                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 334                 codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
 335                 size = 128;
 336         }
 337         if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
 338                 codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
 339                 return -ERANGE;
 340         }
 341
 342         /* set ELD buffer */
 343         for (i = 0; i < size; i++) {
 344                 unsigned int val = hdmi_get_eld_data(codec, nid, i);
 345                 /*
 346                  * Graphics driver might be writing to ELD buffer right now.
 347                  * Just abort. The caller will repoll after a while.
 348                  */
 349                 if (!(val & AC_ELDD_ELD_VALID)) {
 350                         codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
 351                         ret = -EINVAL;
 352                         goto error;
 353                 }
 354                 val &= AC_ELDD_ELD_DATA;
 355                 /*
 356                  * The first byte cannot be zero. This can happen on some DVI
 357                  * connections. Some Intel chips may also need some 250ms delay
 358                  * to return non-zero ELD data, even when the graphics driver
 359                  * correctly writes ELD content before setting ELD_valid bit.
 360                  */
 361                 if (!val && !i) {
 362                         codec_dbg(codec, "HDMI: 0 ELD data\n");
 363                         ret = -EINVAL;
 364                         goto error;
 365                 }
 366                 buf[i] = val;
 367         }
 368
 369         *eld_size = size;
 370 error:
 371         return ret;
 372 }
 373
 374 /*
 375  * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
 376  * hdmi-specific routine.
 377  */
 378 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
 379 {
 380         static unsigned int alsa_rates[] = {
 381                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
 382                 88200, 96000, 176400, 192000, 384000
 383         };
 384         int i, j;
 385
 386         for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
 387                 if (pcm & (1 << i))
 388                         j += snprintf(buf + j, buflen - j,  " %d",
 389                                 alsa_rates[i]);
 390
 391         buf[j] = '\0'; /* necessary when j == 0 */
 392 }
 393
 394 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80
 395
 396 static void hdmi_show_short_audio_desc(struct hda_codec *codec,
 397                                        struct cea_sad *a)
 398 {
 399         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 400         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 401
 402         if (!a->format)
 403                 return;
 404
 405         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 406
 407         if (a->format == AUDIO_CODING_TYPE_LPCM)
 408                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 409         else if (a->max_bitrate)
 410                 snprintf(buf2, sizeof(buf2),
 411                                 ", max bitrate = %d", a->max_bitrate);
 412         else
 413                 buf2[0] = '\0';
 414
 415         codec_dbg(codec,
 416                   "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
 417                   cea_audio_coding_type_names[a->format],
 418                   a->channels, buf, buf2);
 419 }
 420
 421 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 422 {
 423         int i, j;
 424
 425         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 426                 if (spk_alloc & (1 << i))
 427                         j += snprintf(buf + j, buflen - j,  " %s",
 428                                         cea_speaker_allocation_names[i]);
 429         }
 430         buf[j] = '\0';  /* necessary when j == 0 */
 431 }
 432
 433 void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
 434 {
 435         int i;
 436
 437         codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n",
 438                         e->monitor_name,
 439                         eld_connection_type_names[e->conn_type]);
 440
 441         if (e->spk_alloc) {
 442                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 443                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 444                 codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
 445         }
 446
 447         for (i = 0; i < e->sad_count; i++)
 448                 hdmi_show_short_audio_desc(codec, e->sad + i);
 449 }
 450
 451 #ifdef CONFIG_PROC_FS
 452
 453 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 454                                 struct snd_info_buffer *buffer)
 455 {
 456         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 457
 458         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 459                         i, a->format, cea_audio_coding_type_names[a->format]);
 460         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 461
 462         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 463         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 464
 465         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 466                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 467                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 468                                                         i, a->sample_bits, buf);
 469         }
 470
 471         if (a->max_bitrate)
 472                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 473                                                         i, a->max_bitrate);
 474
 475         if (a->profile)
 476                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 477 }
 478
 479 void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
 480                              struct snd_info_buffer *buffer)
 481 {
 482         struct parsed_hdmi_eld *e = &eld->info;
 483         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 484         int i;
 485         static char *eld_version_names[32] = {
 486                 "reserved",
 487                 "reserved",
 488                 "CEA-861D or below",
 489                 [3 ... 30] = "reserved",
 490                 [31] = "partial"
 491         };
 492         static char *cea_edid_version_names[8] = {
 493                 "no CEA EDID Timing Extension block present",
 494                 "CEA-861",
 495                 "CEA-861-A",
 496                 "CEA-861-B, C or D",
 497                 [4 ... 7] = "reserved"
 498         };
 499
 500         snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
 501         snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
 502         if (!eld->eld_valid)
 503                 return;
 504         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 505         snd_iprintf(buffer, "connection_type\t\t%s\n",
 506                                 eld_connection_type_names[e->conn_type]);
 507         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 508                                         eld_version_names[e->eld_ver]);
 509         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 510                                 cea_edid_version_names[e->cea_edid_ver]);
 511         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 512         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 513         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 514         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 515         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 516         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 517
 518         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 519         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 520
 521         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 522
 523         for (i = 0; i < e->sad_count; i++)
 524                 hdmi_print_sad_info(i, e->sad + i, buffer);
 525 }
 526
 527 void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
 528                              struct snd_info_buffer *buffer)
 529 {
 530         struct parsed_hdmi_eld *e = &eld->info;
 531         char line[64];
 532         char name[64];
 533         char *sname;
 534         long long val;
 535         unsigned int n;
 536
 537         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 538                 if (sscanf(line, "%s %llx", name, &val) != 2)
 539                         continue;
 540                 /*
 541                  * We don't allow modification to these fields:
 542                  *      monitor_name manufacture_id product_id
 543                  *      eld_version edid_version
 544                  */
 545                 if (!strcmp(name, "monitor_present"))
 546                         eld->monitor_present = val;
 547                 else if (!strcmp(name, "eld_valid"))
 548                         eld->eld_valid = val;
 549                 else if (!strcmp(name, "connection_type"))
 550                         e->conn_type = val;
 551                 else if (!strcmp(name, "port_id"))
 552                         e->port_id = val;
 553                 else if (!strcmp(name, "support_hdcp"))
 554                         e->support_hdcp = val;
 555                 else if (!strcmp(name, "support_ai"))
 556                         e->support_ai = val;
 557                 else if (!strcmp(name, "audio_sync_delay"))
 558                         e->aud_synch_delay = val;
 559                 else if (!strcmp(name, "speakers"))
 560                         e->spk_alloc = val;
 561                 else if (!strcmp(name, "sad_count"))
 562                         e->sad_count = val;
 563                 else if (!strncmp(name, "sad", 3)) {
 564                         sname = name + 4;
 565                         n = name[3] - '0';
 566                         if (name[4] >= '0' && name[4] <= '9') {
 567                                 sname++;
 568                                 n = 10 * n + name[4] - '0';
 569                         }
 570                         if (n >= ELD_MAX_SAD)
 571                                 continue;
 572                         if (!strcmp(sname, "_coding_type"))
 573                                 e->sad[n].format = val;
 574                         else if (!strcmp(sname, "_channels"))
 575                                 e->sad[n].channels = val;
 576                         else if (!strcmp(sname, "_rates"))
 577                                 e->sad[n].rates = val;
 578                         else if (!strcmp(sname, "_bits"))
 579                                 e->sad[n].sample_bits = val;
 580                         else if (!strcmp(sname, "_max_bitrate"))
 581                                 e->sad[n].max_bitrate = val;
 582                         else if (!strcmp(sname, "_profile"))
 583                                 e->sad[n].profile = val;
 584                         if (n >= e->sad_count)
 585                                 e->sad_count = n + 1;
 586                 }
 587         }
 588 }
 589 #endif /* CONFIG_PROC_FS */
 590
 591 /* update PCM info based on ELD */
 592 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
 593                               struct hda_pcm_stream *hinfo)
 594 {
 595         u32 rates;
 596         u64 formats;
 597         unsigned int maxbps;
 598         unsigned int channels_max;
 599         int i;
 600
 601         /* assume basic audio support (the basic audio flag is not in ELD;
 602          * however, all audio capable sinks are required to support basic
 603          * audio) */
 604         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 605                 SNDRV_PCM_RATE_48000;
 606         formats = SNDRV_PCM_FMTBIT_S16_LE;
 607         maxbps = 16;
 608         channels_max = 2;
 609         for (i = 0; i < e->sad_count; i++) {
 610                 struct cea_sad *a = &e->sad[i];
 611                 rates |= a->rates;
 612                 if (a->channels > channels_max)
 613                         channels_max = a->channels;
 614                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
 615                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
 616                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 617                                 if (maxbps < 20)
 618                                         maxbps = 20;
 619                         }
 620                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
 621                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 622                                 if (maxbps < 24)
 623                                         maxbps = 24;
 624                         }
 625                 }
 626         }
 627
 628         /* restrict the parameters by the values the codec provides */
 629         hinfo->rates &= rates;
 630         hinfo->formats &= formats;
 631         hinfo->maxbps = min(hinfo->maxbps, maxbps);
 632         hinfo->channels_max = min(hinfo->channels_max, channels_max);
 633 }
 634
 635
 636 /* ATI/AMD specific stuff (ELD emulation) */
 637
 638 #define ATI_VERB_SET_AUDIO_DESCRIPTOR   0x776
 639 #define ATI_VERB_SET_SINK_INFO_INDEX    0x780
 640 #define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70
 641 #define ATI_VERB_GET_AUDIO_DESCRIPTOR   0xf76
 642 #define ATI_VERB_GET_AUDIO_VIDEO_DELAY  0xf7b
 643 #define ATI_VERB_GET_SINK_INFO_INDEX    0xf80
 644 #define ATI_VERB_GET_SINK_INFO_DATA     0xf81
 645
 646 #define ATI_SPKALLOC_SPKALLOC           0x007f
 647 #define ATI_SPKALLOC_TYPE_HDMI          0x0100
 648 #define ATI_SPKALLOC_TYPE_DISPLAYPORT   0x0200
 649
 650 /* first three bytes are just standard SAD */
 651 #define ATI_AUDIODESC_CHANNELS          0x00000007
 652 #define ATI_AUDIODESC_RATES             0x0000ff00
 653 #define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000
 654
 655 /* in standard HDMI VSDB format */
 656 #define ATI_DELAY_VIDEO_LATENCY         0x000000ff
 657 #define ATI_DELAY_AUDIO_LATENCY         0x0000ff00
 658
 659 enum ati_sink_info_idx {
 660         ATI_INFO_IDX_MANUFACTURER_ID    = 0,
 661         ATI_INFO_IDX_PRODUCT_ID         = 1,
 662         ATI_INFO_IDX_SINK_DESC_LEN      = 2,
 663         ATI_INFO_IDX_PORT_ID_LOW        = 3,
 664         ATI_INFO_IDX_PORT_ID_HIGH       = 4,
 665         ATI_INFO_IDX_SINK_DESC_FIRST    = 5,
 666         ATI_INFO_IDX_SINK_DESC_LAST     = 22, /* max len 18 bytes */
 667 };
 668
 669 int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
 670                          unsigned char *buf, int *eld_size, bool rev3_or_later)
 671 {
 672         int spkalloc, ati_sad, aud_synch;
 673         int sink_desc_len = 0;
 674         int pos, i;
 675
 676         /* ATI/AMD does not have ELD, emulate it */
 677
 678         spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);
 679
 680         if (spkalloc <= 0) {
 681                 codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
 682                 return -EINVAL;
 683         }
 684
 685         memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);
 686
 687         /* version */
 688         buf[0] = ELD_VER_CEA_861D << 3;
 689
 690         /* speaker allocation from EDID */
 691         buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;
 692
 693         /* is DisplayPort? */
 694         if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
 695                 buf[5] |= 0x04;
 696
 697         pos = ELD_FIXED_BYTES;
 698
 699         if (rev3_or_later) {
 700                 int sink_info;
 701
 702                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
 703                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 704                 put_unaligned_le32(sink_info, buf + 8);
 705
 706                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
 707                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 708                 put_unaligned_le32(sink_info, buf + 12);
 709
 710                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
 711                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 712                 put_unaligned_le16(sink_info, buf + 16);
 713
 714                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
 715                 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 716                 put_unaligned_le16(sink_info, buf + 18);
 717
 718                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
 719                 sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 720
 721                 if (sink_desc_len > ELD_MAX_MNL) {
 722                         codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
 723                                    sink_desc_len);
 724                         sink_desc_len = ELD_MAX_MNL;
 725                 }
 726
 727                 buf[4] |= sink_desc_len;
 728
 729                 for (i = 0; i < sink_desc_len; i++) {
 730                         snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
 731                         buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 732                 }
 733         }
 734
 735         for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
 736                 if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
 737                         continue; /* not handled by ATI/AMD */
 738
 739                 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
 740                 ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);
 741
 742                 if (ati_sad <= 0)
 743                         continue;
 744
 745                 if (ati_sad & ATI_AUDIODESC_RATES) {
 746                         /* format is supported, copy SAD as-is */
 747                         buf[pos++] = (ati_sad & 0x0000ff) >> 0;
 748                         buf[pos++] = (ati_sad & 0x00ff00) >> 8;
 749                         buf[pos++] = (ati_sad & 0xff0000) >> 16;
 750                 }
 751
 752                 if (i == AUDIO_CODING_TYPE_LPCM
 753                     && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
 754                     && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
 755                         /* for PCM there is a separate stereo rate mask */
 756                         buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
 757                         /* rates from the extra byte */
 758                         buf[pos++] = (ati_sad & 0xff000000) >> 24;
 759                         buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
 760                 }
 761         }
 762
 763         if (pos == ELD_FIXED_BYTES + sink_desc_len) {
 764                 codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
 765                 return -EINVAL;
 766         }
 767
 768         /*
 769          * HDMI VSDB latency format:
 770          * separately for both audio and video:
 771          *  0          field not valid or unknown latency
 772          *  [1..251]   msecs = (x-1)*2  (max 500ms with x = 251 = 0xfb)
 773          *  255        audio/video not supported
 774          *
 775          * HDA latency format:
 776          * single value indicating video latency relative to audio:
 777          *  0          unknown or 0ms
 778          *  [1..250]   msecs = x*2  (max 500ms with x = 250 = 0xfa)
 779          *  [251..255] reserved
 780          */
 781         aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
 782         if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
 783                 int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
 784                 int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;
 785
 786                 if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
 787                     video_latency_hdmi > audio_latency_hdmi)
 788                         buf[6] = video_latency_hdmi - audio_latency_hdmi;
 789                 /* else unknown/invalid or 0ms or video ahead of audio, so use zero */
 790         }
 791
 792         /* SAD count */
 793         buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
 794
 795         /* Baseline ELD block length is 4-byte aligned */
 796         pos = round_up(pos, 4);
 797
 798         /* Baseline ELD length (4-byte header is not counted in) */
 799         buf[2] = (pos - 4) / 4;
 800
 801         *eld_size = pos;
 802
 803         return 0;
 804 }