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 } 805