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 const 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 const 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 const 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 += scnprintf(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