linux/sound/pci/hda/hda_eld.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Generic routines and proc interface for ELD(EDID Like Data) information
   4 *
   5 * Copyright(c) 2008 Intel Corporation.
   6 * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi>
   7 *
   8 * Authors:
   9 *              Wu Fengguang <wfg@linux.intel.com>
  10 */
  11
  12#include <linux/init.h>
  13#include <linux/slab.h>
  14#include <sound/core.h>
  15#include <asm/unaligned.h>
  16#include <sound/hda_chmap.h>
  17#include <sound/hda_codec.h>
  18#include "hda_local.h"
  19
  20enum eld_versions {
  21        ELD_VER_CEA_861D        = 2,
  22        ELD_VER_PARTIAL         = 31,
  23};
  24
  25enum cea_edid_versions {
  26        CEA_EDID_VER_NONE       = 0,
  27        CEA_EDID_VER_CEA861     = 1,
  28        CEA_EDID_VER_CEA861A    = 2,
  29        CEA_EDID_VER_CEA861BCD  = 3,
  30        CEA_EDID_VER_RESERVED   = 4,
  31};
  32
  33static const char * const eld_connection_type_names[4] = {
  34        "HDMI",
  35        "DisplayPort",
  36        "2-reserved",
  37        "3-reserved"
  38};
  39
  40enum cea_audio_coding_types {
  41        AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
  42        AUDIO_CODING_TYPE_LPCM                  =  1,
  43        AUDIO_CODING_TYPE_AC3                   =  2,
  44        AUDIO_CODING_TYPE_MPEG1                 =  3,
  45        AUDIO_CODING_TYPE_MP3                   =  4,
  46        AUDIO_CODING_TYPE_MPEG2                 =  5,
  47        AUDIO_CODING_TYPE_AACLC                 =  6,
  48        AUDIO_CODING_TYPE_DTS                   =  7,
  49        AUDIO_CODING_TYPE_ATRAC                 =  8,
  50        AUDIO_CODING_TYPE_SACD                  =  9,
  51        AUDIO_CODING_TYPE_EAC3                  = 10,
  52        AUDIO_CODING_TYPE_DTS_HD                = 11,
  53        AUDIO_CODING_TYPE_MLP                   = 12,
  54        AUDIO_CODING_TYPE_DST                   = 13,
  55        AUDIO_CODING_TYPE_WMAPRO                = 14,
  56        AUDIO_CODING_TYPE_REF_CXT               = 15,
  57        /* also include valid xtypes below */
  58        AUDIO_CODING_TYPE_HE_AAC                = 15,
  59        AUDIO_CODING_TYPE_HE_AAC2               = 16,
  60        AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
  61};
  62
  63enum cea_audio_coding_xtypes {
  64        AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
  65        AUDIO_CODING_XTYPE_HE_AAC               = 1,
  66        AUDIO_CODING_XTYPE_HE_AAC2              = 2,
  67        AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
  68        AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
  69};
  70
  71static const char * const cea_audio_coding_type_names[] = {
  72        /*  0 */ "undefined",
  73        /*  1 */ "LPCM",
  74        /*  2 */ "AC-3",
  75        /*  3 */ "MPEG1",
  76        /*  4 */ "MP3",
  77        /*  5 */ "MPEG2",
  78        /*  6 */ "AAC-LC",
  79        /*  7 */ "DTS",
  80        /*  8 */ "ATRAC",
  81        /*  9 */ "DSD (One Bit Audio)",
  82        /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
  83        /* 11 */ "DTS-HD",
  84        /* 12 */ "MLP (Dolby TrueHD)",
  85        /* 13 */ "DST",
  86        /* 14 */ "WMAPro",
  87        /* 15 */ "HE-AAC",
  88        /* 16 */ "HE-AACv2",
  89        /* 17 */ "MPEG Surround",
  90};
  91
  92/*
  93 * The following two lists are shared between
  94 *      - HDMI audio InfoFrame (source to sink)
  95 *      - CEA E-EDID Extension (sink to source)
  96 */
  97
  98/*
  99 * SS1:SS0 index => sample size
 100 */
 101static int cea_sample_sizes[4] = {
 102        0,                      /* 0: Refer to Stream Header */
 103        AC_SUPPCM_BITS_16,      /* 1: 16 bits */
 104        AC_SUPPCM_BITS_20,      /* 2: 20 bits */
 105        AC_SUPPCM_BITS_24,      /* 3: 24 bits */
 106};
 107
 108/*
 109 * SF2:SF1:SF0 index => sampling frequency
 110 */
 111static int cea_sampling_frequencies[8] = {
 112        0,                      /* 0: Refer to Stream Header */
 113        SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
 114        SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
 115        SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
 116        SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
 117        SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
 118        SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
 119        SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
 120};
 121
 122static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
 123                                        int byte_index)
 124{
 125        unsigned int val;
 126
 127        val = snd_hda_codec_read(codec, nid, 0,
 128                                        AC_VERB_GET_HDMI_ELDD, byte_index);
 129#ifdef BE_PARANOID
 130        codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 131#endif
 132        return val;
 133}
 134
 135#define GRAB_BITS(buf, byte, lowbit, bits)              \
 136({                                                      \
 137        BUILD_BUG_ON(lowbit > 7);                       \
 138        BUILD_BUG_ON(bits > 8);                         \
 139        BUILD_BUG_ON(bits <= 0);                        \
 140                                                        \
 141        (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 142})
 143
 144static void hdmi_update_short_audio_desc(struct hda_codec *codec,
 145                                         struct cea_sad *a,
 146                                         const unsigned char *buf)
 147{
 148        int i;
 149        int val;
 150
 151        val = GRAB_BITS(buf, 1, 0, 7);
 152        a->rates = 0;
 153        for (i = 0; i < 7; i++)
 154                if (val & (1 << i))
 155                        a->rates |= cea_sampling_frequencies[i + 1];
 156
 157        a->channels = GRAB_BITS(buf, 0, 0, 3);
 158        a->channels++;
 159
 160        a->sample_bits = 0;
 161        a->max_bitrate = 0;
 162
 163        a->format = GRAB_BITS(buf, 0, 3, 4);
 164        switch (a->format) {
 165        case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 166                codec_info(codec, "HDMI: audio coding type 0 not expected\n");
 167                break;
 168
 169        case AUDIO_CODING_TYPE_LPCM:
 170                val = GRAB_BITS(buf, 2, 0, 3);
 171                for (i = 0; i < 3; i++)
 172                        if (val & (1 << i))
 173                                a->sample_bits |= cea_sample_sizes[i + 1];
 174                break;
 175
 176        case AUDIO_CODING_TYPE_AC3:
 177        case AUDIO_CODING_TYPE_MPEG1:
 178        case AUDIO_CODING_TYPE_MP3:
 179        case AUDIO_CODING_TYPE_MPEG2:
 180        case AUDIO_CODING_TYPE_AACLC:
 181        case AUDIO_CODING_TYPE_DTS:
 182        case AUDIO_CODING_TYPE_ATRAC:
 183                a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 184                a->max_bitrate *= 8000;
 185                break;
 186
 187        case AUDIO_CODING_TYPE_SACD:
 188                break;
 189
 190        case AUDIO_CODING_TYPE_EAC3:
 191                break;
 192
 193        case AUDIO_CODING_TYPE_DTS_HD:
 194                break;
 195
 196        case AUDIO_CODING_TYPE_MLP:
 197                break;
 198
 199        case AUDIO_CODING_TYPE_DST:
 200                break;
 201
 202        case AUDIO_CODING_TYPE_WMAPRO:
 203                a->profile = GRAB_BITS(buf, 2, 0, 3);
 204                break;
 205
 206        case AUDIO_CODING_TYPE_REF_CXT:
 207                a->format = GRAB_BITS(buf, 2, 3, 5);
 208                if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 209                    a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 210                        codec_info(codec,
 211                                   "HDMI: audio coding xtype %d not expected\n",
 212                                   a->format);
 213                        a->format = 0;
 214                } else
 215                        a->format += AUDIO_CODING_TYPE_HE_AAC -
 216                                     AUDIO_CODING_XTYPE_HE_AAC;
 217                break;
 218        }
 219}
 220
 221/*
 222 * Be careful, ELD buf could be totally rubbish!
 223 */
 224int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
 225                          const unsigned char *buf, int size)
 226{
 227        int mnl;
 228        int i;
 229
 230        memset(e, 0, sizeof(*e));
 231        e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 232        if (e->eld_ver != ELD_VER_CEA_861D &&
 233            e->eld_ver != ELD_VER_PARTIAL) {
 234                codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
 235                goto out_fail;
 236        }
 237
 238        e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 239        mnl             = GRAB_BITS(buf, 4, 0, 5);
 240        e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 241
 242        e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 243        e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 244        e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 245        e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 246
 247        e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 248        e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 249
 250        e->port_id        = get_unaligned_le64(buf + 8);
 251
 252        /* not specified, but the spec's tendency is little endian */
 253        e->manufacture_id = get_unaligned_le16(buf + 16);
 254        e->product_id     = get_unaligned_le16(buf + 18);
 255
 256        if (mnl > ELD_MAX_MNL) {
 257                codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
 258                goto out_fail;
 259        } else if (ELD_FIXED_BYTES + mnl > size) {
 260                codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
 261                goto out_fail;
 262        } else
 263                strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
 264
 265        for (i = 0; i < e->sad_count; i++) {
 266                if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 267                        codec_info(codec, "HDMI: out of range SAD %d\n", i);
 268                        goto out_fail;
 269                }
 270                hdmi_update_short_audio_desc(codec, e->sad + i,
 271                                        buf + ELD_FIXED_BYTES + mnl + 3 * i);
 272        }
 273
 274        /*
 275         * HDMI sink's ELD info cannot always be retrieved for now, e.g.
 276         * in console or for audio devices. Assume the highest speakers
 277         * configuration, to _not_ prohibit multi-channel audio playback.
 278         */
 279        if (!e->spk_alloc)
 280                e->spk_alloc = 0xffff;
 281
 282        return 0;
 283
 284out_fail:
 285        return -EINVAL;
 286}
 287
 288int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 289{
 290        return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 291                                                 AC_DIPSIZE_ELD_BUF);
 292}
 293
 294int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
 295                     unsigned char *buf, int *eld_size)
 296{
 297        int i;
 298        int ret = 0;
 299        int size;
 300
 301        /*
 302         * ELD size is initialized to zero in caller function. If no errors and
 303         * ELD is valid, actual eld_size is assigned.
 304         */
 305
 306        size = snd_hdmi_get_eld_size(codec, nid);
 307        if (size == 0) {
 308                /* wfg: workaround for ASUS P5E-VM HDMI board */
 309                codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
 310                size = 128;
 311        }
 312        if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
 313                codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
 314                return -ERANGE;
 315        }
 316
 317        /* set ELD buffer */
 318        for (i = 0; i < size; i++) {
 319                unsigned int val = hdmi_get_eld_data(codec, nid, i);
 320                /*
 321                 * Graphics driver might be writing to ELD buffer right now.
 322                 * Just abort. The caller will repoll after a while.
 323                 */
 324                if (!(val & AC_ELDD_ELD_VALID)) {
 325                        codec_info(codec, "HDMI: invalid ELD data byte %d\n", i);
 326                        ret = -EINVAL;
 327                        goto error;
 328                }
 329                val &= AC_ELDD_ELD_DATA;
 330                /*
 331                 * The first byte cannot be zero. This can happen on some DVI
 332                 * connections. Some Intel chips may also need some 250ms delay
 333                 * to return non-zero ELD data, even when the graphics driver
 334                 * correctly writes ELD content before setting ELD_valid bit.
 335                 */
 336                if (!val && !i) {
 337                        codec_dbg(codec, "HDMI: 0 ELD data\n");
 338                        ret = -EINVAL;
 339                        goto error;
 340                }
 341                buf[i] = val;
 342        }
 343
 344        *eld_size = size;
 345error:
 346        return ret;
 347}
 348
 349/*
 350 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
 351 * hdmi-specific routine.
 352 */
 353static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
 354{
 355        static unsigned int alsa_rates[] = {
 356                5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
 357                88200, 96000, 176400, 192000, 384000
 358        };
 359        int i, j;
 360
 361        for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
 362                if (pcm & (1 << i))
 363                        j += snprintf(buf + j, buflen - j,  " %d",
 364                                alsa_rates[i]);
 365
 366        buf[j] = '\0'; /* necessary when j == 0 */
 367}
 368
 369#define SND_PRINT_RATES_ADVISED_BUFSIZE 80
 370
 371static void hdmi_show_short_audio_desc(struct hda_codec *codec,
 372                                       struct cea_sad *a)
 373{
 374        char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 375        char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 376
 377        if (!a->format)
 378                return;
 379
 380        hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 381
 382        if (a->format == AUDIO_CODING_TYPE_LPCM)
 383                snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 384        else if (a->max_bitrate)
 385                snprintf(buf2, sizeof(buf2),
 386                                ", max bitrate = %d", a->max_bitrate);
 387        else
 388                buf2[0] = '\0';
 389
 390        codec_dbg(codec,
 391                  "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
 392                  cea_audio_coding_type_names[a->format],
 393                  a->channels, buf, buf2);
 394}
 395
 396void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
 397{
 398        int i;
 399
 400        codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n",
 401                        e->monitor_name,
 402                        eld_connection_type_names[e->conn_type]);
 403
 404        if (e->spk_alloc) {
 405                char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 406                snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 407                codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
 408        }
 409
 410        for (i = 0; i < e->sad_count; i++)
 411                hdmi_show_short_audio_desc(codec, e->sad + i);
 412}
 413
 414#ifdef CONFIG_SND_PROC_FS
 415
 416static void hdmi_print_sad_info(int i, struct cea_sad *a,
 417                                struct snd_info_buffer *buffer)
 418{
 419        char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 420
 421        snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 422                        i, a->format, cea_audio_coding_type_names[a->format]);
 423        snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 424
 425        hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 426        snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 427
 428        if (a->format == AUDIO_CODING_TYPE_LPCM) {
 429                snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 430                snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 431                                                        i, a->sample_bits, buf);
 432        }
 433
 434        if (a->max_bitrate)
 435                snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 436                                                        i, a->max_bitrate);
 437
 438        if (a->profile)
 439                snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 440}
 441
 442void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
 443                             struct snd_info_buffer *buffer)
 444{
 445        struct parsed_hdmi_eld *e = &eld->info;
 446        char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 447        int i;
 448        static const char * const eld_version_names[32] = {
 449                "reserved",
 450                "reserved",
 451                "CEA-861D or below",
 452                [3 ... 30] = "reserved",
 453                [31] = "partial"
 454        };
 455        static const char * const cea_edid_version_names[8] = {
 456                "no CEA EDID Timing Extension block present",
 457                "CEA-861",
 458                "CEA-861-A",
 459                "CEA-861-B, C or D",
 460                [4 ... 7] = "reserved"
 461        };
 462
 463        snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
 464        snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
 465        if (!eld->eld_valid)
 466                return;
 467        snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 468        snd_iprintf(buffer, "connection_type\t\t%s\n",
 469                                eld_connection_type_names[e->conn_type]);
 470        snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 471                                        eld_version_names[e->eld_ver]);
 472        snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 473                                cea_edid_version_names[e->cea_edid_ver]);
 474        snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 475        snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 476        snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 477        snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 478        snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 479        snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 480
 481        snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 482        snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 483
 484        snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 485
 486        for (i = 0; i < e->sad_count; i++)
 487                hdmi_print_sad_info(i, e->sad + i, buffer);
 488}
 489
 490void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
 491                             struct snd_info_buffer *buffer)
 492{
 493        struct parsed_hdmi_eld *e = &eld->info;
 494        char line[64];
 495        char name[64];
 496        char *sname;
 497        long long val;
 498        unsigned int n;
 499
 500        while (!snd_info_get_line(buffer, line, sizeof(line))) {
 501                if (sscanf(line, "%s %llx", name, &val) != 2)
 502                        continue;
 503                /*
 504                 * We don't allow modification to these fields:
 505                 *      monitor_name manufacture_id product_id
 506                 *      eld_version edid_version
 507                 */
 508                if (!strcmp(name, "monitor_present"))
 509                        eld->monitor_present = val;
 510                else if (!strcmp(name, "eld_valid"))
 511                        eld->eld_valid = val;
 512                else if (!strcmp(name, "connection_type"))
 513                        e->conn_type = val;
 514                else if (!strcmp(name, "port_id"))
 515                        e->port_id = val;
 516                else if (!strcmp(name, "support_hdcp"))
 517                        e->support_hdcp = val;
 518                else if (!strcmp(name, "support_ai"))
 519                        e->support_ai = val;
 520                else if (!strcmp(name, "audio_sync_delay"))
 521                        e->aud_synch_delay = val;
 522                else if (!strcmp(name, "speakers"))
 523                        e->spk_alloc = val;
 524                else if (!strcmp(name, "sad_count"))
 525                        e->sad_count = val;
 526                else if (!strncmp(name, "sad", 3)) {
 527                        sname = name + 4;
 528                        n = name[3] - '0';
 529                        if (name[4] >= '0' && name[4] <= '9') {
 530                                sname++;
 531                                n = 10 * n + name[4] - '0';
 532                        }
 533                        if (n >= ELD_MAX_SAD)
 534                                continue;
 535                        if (!strcmp(sname, "_coding_type"))
 536                                e->sad[n].format = val;
 537                        else if (!strcmp(sname, "_channels"))
 538                                e->sad[n].channels = val;
 539                        else if (!strcmp(sname, "_rates"))
 540                                e->sad[n].rates = val;
 541                        else if (!strcmp(sname, "_bits"))
 542                                e->sad[n].sample_bits = val;
 543                        else if (!strcmp(sname, "_max_bitrate"))
 544                                e->sad[n].max_bitrate = val;
 545                        else if (!strcmp(sname, "_profile"))
 546                                e->sad[n].profile = val;
 547                        if (n >= e->sad_count)
 548                                e->sad_count = n + 1;
 549                }
 550        }
 551}
 552#endif /* CONFIG_SND_PROC_FS */
 553
 554/* update PCM info based on ELD */
 555void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
 556                              struct hda_pcm_stream *hinfo)
 557{
 558        u32 rates;
 559        u64 formats;
 560        unsigned int maxbps;
 561        unsigned int channels_max;
 562        int i;
 563
 564        /* assume basic audio support (the basic audio flag is not in ELD;
 565         * however, all audio capable sinks are required to support basic
 566         * audio) */
 567        rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 568                SNDRV_PCM_RATE_48000;
 569        formats = SNDRV_PCM_FMTBIT_S16_LE;
 570        maxbps = 16;
 571        channels_max = 2;
 572        for (i = 0; i < e->sad_count; i++) {
 573                struct cea_sad *a = &e->sad[i];
 574                rates |= a->rates;
 575                if (a->channels > channels_max)
 576                        channels_max = a->channels;
 577                if (a->format == AUDIO_CODING_TYPE_LPCM) {
 578                        if (a->sample_bits & AC_SUPPCM_BITS_20) {
 579                                formats |= SNDRV_PCM_FMTBIT_S32_LE;
 580                                if (maxbps < 20)
 581                                        maxbps = 20;
 582                        }
 583                        if (a->sample_bits & AC_SUPPCM_BITS_24) {
 584                                formats |= SNDRV_PCM_FMTBIT_S32_LE;
 585                                if (maxbps < 24)
 586                                        maxbps = 24;
 587                        }
 588                }
 589        }
 590
 591        /* restrict the parameters by the values the codec provides */
 592        hinfo->rates &= rates;
 593        hinfo->formats &= formats;
 594        hinfo->maxbps = min(hinfo->maxbps, maxbps);
 595        hinfo->channels_max = min(hinfo->channels_max, channels_max);
 596}
 597
 598
 599/* ATI/AMD specific stuff (ELD emulation) */
 600
 601#define ATI_VERB_SET_AUDIO_DESCRIPTOR   0x776
 602#define ATI_VERB_SET_SINK_INFO_INDEX    0x780
 603#define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70
 604#define ATI_VERB_GET_AUDIO_DESCRIPTOR   0xf76
 605#define ATI_VERB_GET_AUDIO_VIDEO_DELAY  0xf7b
 606#define ATI_VERB_GET_SINK_INFO_INDEX    0xf80
 607#define ATI_VERB_GET_SINK_INFO_DATA     0xf81
 608
 609#define ATI_SPKALLOC_SPKALLOC           0x007f
 610#define ATI_SPKALLOC_TYPE_HDMI          0x0100
 611#define ATI_SPKALLOC_TYPE_DISPLAYPORT   0x0200
 612
 613/* first three bytes are just standard SAD */
 614#define ATI_AUDIODESC_CHANNELS          0x00000007
 615#define ATI_AUDIODESC_RATES             0x0000ff00
 616#define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000
 617
 618/* in standard HDMI VSDB format */
 619#define ATI_DELAY_VIDEO_LATENCY         0x000000ff
 620#define ATI_DELAY_AUDIO_LATENCY         0x0000ff00
 621
 622enum ati_sink_info_idx {
 623        ATI_INFO_IDX_MANUFACTURER_ID    = 0,
 624        ATI_INFO_IDX_PRODUCT_ID         = 1,
 625        ATI_INFO_IDX_SINK_DESC_LEN      = 2,
 626        ATI_INFO_IDX_PORT_ID_LOW        = 3,
 627        ATI_INFO_IDX_PORT_ID_HIGH       = 4,
 628        ATI_INFO_IDX_SINK_DESC_FIRST    = 5,
 629        ATI_INFO_IDX_SINK_DESC_LAST     = 22, /* max len 18 bytes */
 630};
 631
 632int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
 633                         unsigned char *buf, int *eld_size, bool rev3_or_later)
 634{
 635        int spkalloc, ati_sad, aud_synch;
 636        int sink_desc_len = 0;
 637        int pos, i;
 638
 639        /* ATI/AMD does not have ELD, emulate it */
 640
 641        spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0);
 642
 643        if (spkalloc <= 0) {
 644                codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n");
 645                return -EINVAL;
 646        }
 647
 648        memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3);
 649
 650        /* version */
 651        buf[0] = ELD_VER_CEA_861D << 3;
 652
 653        /* speaker allocation from EDID */
 654        buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC;
 655
 656        /* is DisplayPort? */
 657        if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT)
 658                buf[5] |= 0x04;
 659
 660        pos = ELD_FIXED_BYTES;
 661
 662        if (rev3_or_later) {
 663                int sink_info;
 664
 665                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW);
 666                sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 667                put_unaligned_le32(sink_info, buf + 8);
 668
 669                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH);
 670                sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 671                put_unaligned_le32(sink_info, buf + 12);
 672
 673                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID);
 674                sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 675                put_unaligned_le16(sink_info, buf + 16);
 676
 677                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID);
 678                sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 679                put_unaligned_le16(sink_info, buf + 18);
 680
 681                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN);
 682                sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 683
 684                if (sink_desc_len > ELD_MAX_MNL) {
 685                        codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n",
 686                                   sink_desc_len);
 687                        sink_desc_len = ELD_MAX_MNL;
 688                }
 689
 690                buf[4] |= sink_desc_len;
 691
 692                for (i = 0; i < sink_desc_len; i++) {
 693                        snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i);
 694                        buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0);
 695                }
 696        }
 697
 698        for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) {
 699                if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST)
 700                        continue; /* not handled by ATI/AMD */
 701
 702                snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3);
 703                ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0);
 704
 705                if (ati_sad <= 0)
 706                        continue;
 707
 708                if (ati_sad & ATI_AUDIODESC_RATES) {
 709                        /* format is supported, copy SAD as-is */
 710                        buf[pos++] = (ati_sad & 0x0000ff) >> 0;
 711                        buf[pos++] = (ati_sad & 0x00ff00) >> 8;
 712                        buf[pos++] = (ati_sad & 0xff0000) >> 16;
 713                }
 714
 715                if (i == AUDIO_CODING_TYPE_LPCM
 716                    && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES)
 717                    && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) {
 718                        /* for PCM there is a separate stereo rate mask */
 719                        buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1;
 720                        /* rates from the extra byte */
 721                        buf[pos++] = (ati_sad & 0xff000000) >> 24;
 722                        buf[pos++] = (ati_sad & 0x00ff0000) >> 16;
 723                }
 724        }
 725
 726        if (pos == ELD_FIXED_BYTES + sink_desc_len) {
 727                codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n");
 728                return -EINVAL;
 729        }
 730
 731        /*
 732         * HDMI VSDB latency format:
 733         * separately for both audio and video:
 734         *  0          field not valid or unknown latency
 735         *  [1..251]   msecs = (x-1)*2  (max 500ms with x = 251 = 0xfb)
 736         *  255        audio/video not supported
 737         *
 738         * HDA latency format:
 739         * single value indicating video latency relative to audio:
 740         *  0          unknown or 0ms
 741         *  [1..250]   msecs = x*2  (max 500ms with x = 250 = 0xfa)
 742         *  [251..255] reserved
 743         */
 744        aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0);
 745        if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) {
 746                int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY);
 747                int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8;
 748
 749                if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb &&
 750                    video_latency_hdmi > audio_latency_hdmi)
 751                        buf[6] = video_latency_hdmi - audio_latency_hdmi;
 752                /* else unknown/invalid or 0ms or video ahead of audio, so use zero */
 753        }
 754
 755        /* SAD count */
 756        buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4;
 757
 758        /* Baseline ELD block length is 4-byte aligned */
 759        pos = round_up(pos, 4);
 760
 761        /* Baseline ELD length (4-byte header is not counted in) */
 762        buf[2] = (pos - 4) / 4;
 763
 764        *eld_size = pos;
 765
 766        return 0;
 767}
 768