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 const char * const 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 const char * const 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 const char * const 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 memset(e, 0, sizeof(*e)); 257 e->eld_ver = GRAB_BITS(buf, 0, 3, 5); 258 if (e->eld_ver != ELD_VER_CEA_861D && 259 e->eld_ver != ELD_VER_PARTIAL) { 260 codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver); 261 goto out_fail; 262 } 263 264 e->baseline_len = GRAB_BITS(buf, 2, 0, 8); 265 mnl = GRAB_BITS(buf, 4, 0, 5); 266 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3); 267 268 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1); 269 e->support_ai = GRAB_BITS(buf, 5, 1, 1); 270 e->conn_type = GRAB_BITS(buf, 5, 2, 2); 271 e->sad_count = GRAB_BITS(buf, 5, 4, 4); 272 273 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2; 274 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7); 275 276 e->port_id = get_unaligned_le64(buf + 8); 277 278 /* not specified, but the spec's tendency is little endian */ 279 e->manufacture_id = get_unaligned_le16(buf + 16); 280 e->product_id = get_unaligned_le16(buf + 18); 281 282 if (mnl > ELD_MAX_MNL) { 283 codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl); 284 goto out_fail; 285 } else if (ELD_FIXED_BYTES + mnl > size) { 286 codec_info(codec, "HDMI: out of range MNL %d\n", mnl); 287 goto out_fail; 288 } else 289 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1); 290 291 for (i = 0; i < e->sad_count; i++) { 292 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) { 293 codec_info(codec, "HDMI: out of range SAD %d\n", i); 294 goto out_fail; 295 } 296 hdmi_update_short_audio_desc(codec, e->sad + i, 297 buf + ELD_FIXED_BYTES + mnl + 3 * i); 298 } 299 300 /* 301 * HDMI sink's ELD info cannot always be retrieved for now, e.g. 302 * in console or for audio devices. Assume the highest speakers 303 * configuration, to _not_ prohibit multi-channel audio playback. 304 */ 305 if (!e->spk_alloc) 306 e->spk_alloc = 0xffff; 307 308 return 0; 309 310 out_fail: 311 return -EINVAL; 312 } 313 314 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) 315 { 316 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, 317 AC_DIPSIZE_ELD_BUF); 318 } 319 320 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid, 321 unsigned char *buf, int *eld_size) 322 { 323 int i; 324 int ret = 0; 325 int size; 326 327 /* 328 * ELD size is initialized to zero in caller function. If no errors and 329 * ELD is valid, actual eld_size is assigned. 330 */ 331 332 size = snd_hdmi_get_eld_size(codec, nid); 333 if (size == 0) { 334 /* wfg: workaround for ASUS P5E-VM HDMI board */ 335 codec_info(codec, "HDMI: ELD buf size is 0, force 128\n"); 336 size = 128; 337 } 338 if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) { 339 codec_info(codec, "HDMI: invalid ELD buf size %d\n", size); 340 return -ERANGE; 341 } 342 343 /* set ELD buffer */ 344 for (i = 0; i < size; i++) { 345 unsigned int val = hdmi_get_eld_data(codec, nid, i); 346 /* 347 * Graphics driver might be writing to ELD buffer right now. 348 * Just abort. The caller will repoll after a while. 349 */ 350 if (!(val & AC_ELDD_ELD_VALID)) { 351 codec_info(codec, "HDMI: invalid ELD data byte %d\n", i); 352 ret = -EINVAL; 353 goto error; 354 } 355 val &= AC_ELDD_ELD_DATA; 356 /* 357 * The first byte cannot be zero. This can happen on some DVI 358 * connections. Some Intel chips may also need some 250ms delay 359 * to return non-zero ELD data, even when the graphics driver 360 * correctly writes ELD content before setting ELD_valid bit. 361 */ 362 if (!val && !i) { 363 codec_dbg(codec, "HDMI: 0 ELD data\n"); 364 ret = -EINVAL; 365 goto error; 366 } 367 buf[i] = val; 368 } 369 370 *eld_size = size; 371 error: 372 return ret; 373 } 374 375 /* 376 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with 377 * hdmi-specific routine. 378 */ 379 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen) 380 { 381 static unsigned int alsa_rates[] = { 382 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 383 88200, 96000, 176400, 192000, 384000 384 }; 385 int i, j; 386 387 for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++) 388 if (pcm & (1 << i)) 389 j += snprintf(buf + j, buflen - j, " %d", 390 alsa_rates[i]); 391 392 buf[j] = '\0'; /* necessary when j == 0 */ 393 } 394 395 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80 396 397 static void hdmi_show_short_audio_desc(struct hda_codec *codec, 398 struct cea_sad *a) 399 { 400 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 401 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; 402 403 if (!a->format) 404 return; 405 406 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); 407 408 if (a->format == AUDIO_CODING_TYPE_LPCM) 409 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8); 410 else if (a->max_bitrate) 411 snprintf(buf2, sizeof(buf2), 412 ", max bitrate = %d", a->max_bitrate); 413 else 414 buf2[0] = '\0'; 415 416 codec_dbg(codec, 417 "HDMI: supports coding type %s: channels = %d, rates =%s%s\n", 418 cea_audio_coding_type_names[a->format], 419 a->channels, buf, buf2); 420 } 421 422 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen) 423 { 424 int i, j; 425 426 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) { 427 if (spk_alloc & (1 << i)) 428 j += snprintf(buf + j, buflen - j, " %s", 429 cea_speaker_allocation_names[i]); 430 } 431 buf[j] = '\0'; /* necessary when j == 0 */ 432 } 433 434 void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e) 435 { 436 int i; 437 438 codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n", 439 e->monitor_name, 440 eld_connection_type_names[e->conn_type]); 441 442 if (e->spk_alloc) { 443 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 444 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 445 codec_dbg(codec, "HDMI: available speakers:%s\n", buf); 446 } 447 448 for (i = 0; i < e->sad_count; i++) 449 hdmi_show_short_audio_desc(codec, e->sad + i); 450 } 451 452 #ifdef CONFIG_SND_PROC_FS 453 454 static void hdmi_print_sad_info(int i, struct cea_sad *a, 455 struct snd_info_buffer *buffer) 456 { 457 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 458 459 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", 460 i, a->format, cea_audio_coding_type_names[a->format]); 461 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); 462 463 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); 464 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); 465 466 if (a->format == AUDIO_CODING_TYPE_LPCM) { 467 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); 468 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", 469 i, a->sample_bits, buf); 470 } 471 472 if (a->max_bitrate) 473 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", 474 i, a->max_bitrate); 475 476 if (a->profile) 477 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); 478 } 479 480 void snd_hdmi_print_eld_info(struct hdmi_eld *eld, 481 struct snd_info_buffer *buffer) 482 { 483 struct parsed_hdmi_eld *e = &eld->info; 484 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 485 int i; 486 static const char * const eld_version_names[32] = { 487 "reserved", 488 "reserved", 489 "CEA-861D or below", 490 [3 ... 30] = "reserved", 491 [31] = "partial" 492 }; 493 static const char * const cea_edid_version_names[8] = { 494 "no CEA EDID Timing Extension block present", 495 "CEA-861", 496 "CEA-861-A", 497 "CEA-861-B, C or D", 498 [4 ... 7] = "reserved" 499 }; 500 501 snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present); 502 snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid); 503 if (!eld->eld_valid) 504 return; 505 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); 506 snd_iprintf(buffer, "connection_type\t\t%s\n", 507 eld_connection_type_names[e->conn_type]); 508 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, 509 eld_version_names[e->eld_ver]); 510 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, 511 cea_edid_version_names[e->cea_edid_ver]); 512 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); 513 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); 514 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); 515 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); 516 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); 517 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); 518 519 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 520 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); 521 522 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); 523 524 for (i = 0; i < e->sad_count; i++) 525 hdmi_print_sad_info(i, e->sad + i, buffer); 526 } 527 528 void snd_hdmi_write_eld_info(struct hdmi_eld *eld, 529 struct snd_info_buffer *buffer) 530 { 531 struct parsed_hdmi_eld *e = &eld->info; 532 char line[64]; 533 char name[64]; 534 char *sname; 535 long long val; 536 unsigned int n; 537 538 while (!snd_info_get_line(buffer, line, sizeof(line))) { 539 if (sscanf(line, "%s %llx", name, &val) != 2) 540 continue; 541 /* 542 * We don't allow modification to these fields: 543 * monitor_name manufacture_id product_id 544 * eld_version edid_version 545 */ 546 if (!strcmp(name, "monitor_present")) 547 eld->monitor_present = val; 548 else if (!strcmp(name, "eld_valid")) 549 eld->eld_valid = val; 550 else if (!strcmp(name, "connection_type")) 551 e->conn_type = val; 552 else if (!strcmp(name, "port_id")) 553 e->port_id = val; 554 else if (!strcmp(name, "support_hdcp")) 555 e->support_hdcp = val; 556 else if (!strcmp(name, "support_ai")) 557 e->support_ai = val; 558 else if (!strcmp(name, "audio_sync_delay")) 559 e->aud_synch_delay = val; 560 else if (!strcmp(name, "speakers")) 561 e->spk_alloc = val; 562 else if (!strcmp(name, "sad_count")) 563 e->sad_count = val; 564 else if (!strncmp(name, "sad", 3)) { 565 sname = name + 4; 566 n = name[3] - '0'; 567 if (name[4] >= '0' && name[4] <= '9') { 568 sname++; 569 n = 10 * n + name[4] - '0'; 570 } 571 if (n >= ELD_MAX_SAD) 572 continue; 573 if (!strcmp(sname, "_coding_type")) 574 e->sad[n].format = val; 575 else if (!strcmp(sname, "_channels")) 576 e->sad[n].channels = val; 577 else if (!strcmp(sname, "_rates")) 578 e->sad[n].rates = val; 579 else if (!strcmp(sname, "_bits")) 580 e->sad[n].sample_bits = val; 581 else if (!strcmp(sname, "_max_bitrate")) 582 e->sad[n].max_bitrate = val; 583 else if (!strcmp(sname, "_profile")) 584 e->sad[n].profile = val; 585 if (n >= e->sad_count) 586 e->sad_count = n + 1; 587 } 588 } 589 } 590 #endif /* CONFIG_SND_PROC_FS */ 591 592 /* update PCM info based on ELD */ 593 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e, 594 struct hda_pcm_stream *hinfo) 595 { 596 u32 rates; 597 u64 formats; 598 unsigned int maxbps; 599 unsigned int channels_max; 600 int i; 601 602 /* assume basic audio support (the basic audio flag is not in ELD; 603 * however, all audio capable sinks are required to support basic 604 * audio) */ 605 rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | 606 SNDRV_PCM_RATE_48000; 607 formats = SNDRV_PCM_FMTBIT_S16_LE; 608 maxbps = 16; 609 channels_max = 2; 610 for (i = 0; i < e->sad_count; i++) { 611 struct cea_sad *a = &e->sad[i]; 612 rates |= a->rates; 613 if (a->channels > channels_max) 614 channels_max = a->channels; 615 if (a->format == AUDIO_CODING_TYPE_LPCM) { 616 if (a->sample_bits & AC_SUPPCM_BITS_20) { 617 formats |= SNDRV_PCM_FMTBIT_S32_LE; 618 if (maxbps < 20) 619 maxbps = 20; 620 } 621 if (a->sample_bits & AC_SUPPCM_BITS_24) { 622 formats |= SNDRV_PCM_FMTBIT_S32_LE; 623 if (maxbps < 24) 624 maxbps = 24; 625 } 626 } 627 } 628 629 /* restrict the parameters by the values the codec provides */ 630 hinfo->rates &= rates; 631 hinfo->formats &= formats; 632 hinfo->maxbps = min(hinfo->maxbps, maxbps); 633 hinfo->channels_max = min(hinfo->channels_max, channels_max); 634 } 635 636 637 /* ATI/AMD specific stuff (ELD emulation) */ 638 639 #define ATI_VERB_SET_AUDIO_DESCRIPTOR 0x776 640 #define ATI_VERB_SET_SINK_INFO_INDEX 0x780 641 #define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70 642 #define ATI_VERB_GET_AUDIO_DESCRIPTOR 0xf76 643 #define ATI_VERB_GET_AUDIO_VIDEO_DELAY 0xf7b 644 #define ATI_VERB_GET_SINK_INFO_INDEX 0xf80 645 #define ATI_VERB_GET_SINK_INFO_DATA 0xf81 646 647 #define ATI_SPKALLOC_SPKALLOC 0x007f 648 #define ATI_SPKALLOC_TYPE_HDMI 0x0100 649 #define ATI_SPKALLOC_TYPE_DISPLAYPORT 0x0200 650 651 /* first three bytes are just standard SAD */ 652 #define ATI_AUDIODESC_CHANNELS 0x00000007 653 #define ATI_AUDIODESC_RATES 0x0000ff00 654 #define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000 655 656 /* in standard HDMI VSDB format */ 657 #define ATI_DELAY_VIDEO_LATENCY 0x000000ff 658 #define ATI_DELAY_AUDIO_LATENCY 0x0000ff00 659 660 enum ati_sink_info_idx { 661 ATI_INFO_IDX_MANUFACTURER_ID = 0, 662 ATI_INFO_IDX_PRODUCT_ID = 1, 663 ATI_INFO_IDX_SINK_DESC_LEN = 2, 664 ATI_INFO_IDX_PORT_ID_LOW = 3, 665 ATI_INFO_IDX_PORT_ID_HIGH = 4, 666 ATI_INFO_IDX_SINK_DESC_FIRST = 5, 667 ATI_INFO_IDX_SINK_DESC_LAST = 22, /* max len 18 bytes */ 668 }; 669 670 int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid, 671 unsigned char *buf, int *eld_size, bool rev3_or_later) 672 { 673 int spkalloc, ati_sad, aud_synch; 674 int sink_desc_len = 0; 675 int pos, i; 676 677 /* ATI/AMD does not have ELD, emulate it */ 678 679 spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0); 680 681 if (spkalloc <= 0) { 682 codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n"); 683 return -EINVAL; 684 } 685 686 memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3); 687 688 /* version */ 689 buf[0] = ELD_VER_CEA_861D << 3; 690 691 /* speaker allocation from EDID */ 692 buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC; 693 694 /* is DisplayPort? */ 695 if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT) 696 buf[5] |= 0x04; 697 698 pos = ELD_FIXED_BYTES; 699 700 if (rev3_or_later) { 701 int sink_info; 702 703 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW); 704 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 705 put_unaligned_le32(sink_info, buf + 8); 706 707 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH); 708 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 709 put_unaligned_le32(sink_info, buf + 12); 710 711 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID); 712 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 713 put_unaligned_le16(sink_info, buf + 16); 714 715 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID); 716 sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 717 put_unaligned_le16(sink_info, buf + 18); 718 719 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN); 720 sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 721 722 if (sink_desc_len > ELD_MAX_MNL) { 723 codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n", 724 sink_desc_len); 725 sink_desc_len = ELD_MAX_MNL; 726 } 727 728 buf[4] |= sink_desc_len; 729 730 for (i = 0; i < sink_desc_len; i++) { 731 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i); 732 buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); 733 } 734 } 735 736 for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) { 737 if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST) 738 continue; /* not handled by ATI/AMD */ 739 740 snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3); 741 ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0); 742 743 if (ati_sad <= 0) 744 continue; 745 746 if (ati_sad & ATI_AUDIODESC_RATES) { 747 /* format is supported, copy SAD as-is */ 748 buf[pos++] = (ati_sad & 0x0000ff) >> 0; 749 buf[pos++] = (ati_sad & 0x00ff00) >> 8; 750 buf[pos++] = (ati_sad & 0xff0000) >> 16; 751 } 752 753 if (i == AUDIO_CODING_TYPE_LPCM 754 && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) 755 && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) { 756 /* for PCM there is a separate stereo rate mask */ 757 buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1; 758 /* rates from the extra byte */ 759 buf[pos++] = (ati_sad & 0xff000000) >> 24; 760 buf[pos++] = (ati_sad & 0x00ff0000) >> 16; 761 } 762 } 763 764 if (pos == ELD_FIXED_BYTES + sink_desc_len) { 765 codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n"); 766 return -EINVAL; 767 } 768 769 /* 770 * HDMI VSDB latency format: 771 * separately for both audio and video: 772 * 0 field not valid or unknown latency 773 * [1..251] msecs = (x-1)*2 (max 500ms with x = 251 = 0xfb) 774 * 255 audio/video not supported 775 * 776 * HDA latency format: 777 * single value indicating video latency relative to audio: 778 * 0 unknown or 0ms 779 * [1..250] msecs = x*2 (max 500ms with x = 250 = 0xfa) 780 * [251..255] reserved 781 */ 782 aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0); 783 if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) { 784 int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY); 785 int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8; 786 787 if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb && 788 video_latency_hdmi > audio_latency_hdmi) 789 buf[6] = video_latency_hdmi - audio_latency_hdmi; 790 /* else unknown/invalid or 0ms or video ahead of audio, so use zero */ 791 } 792 793 /* SAD count */ 794 buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4; 795 796 /* Baseline ELD block length is 4-byte aligned */ 797 pos = round_up(pos, 4); 798 799 /* Baseline ELD length (4-byte header is not counted in) */ 800 buf[2] = (pos - 4) / 4; 801 802 *eld_size = pos; 803 804 return 0; 805 } 806