// SPDX-License-Identifier: GPL-2.0-or-later /* * Generic routines and proc interface for ELD(EDID Like Data) information * * Copyright(c) 2008 Intel Corporation. * Copyright (c) 2013 Anssi Hannula <anssi.hannula@iki.fi> * * Authors: * Wu Fengguang <wfg@linux.intel.com> */ #include <linux/init.h> #include <linux/slab.h> #include <sound/core.h> #include <asm/unaligned.h> #include <sound/hda_chmap.h> #include <sound/hda_codec.h> #include "hda_local.h" enum eld_versions { ELD_VER_CEA_861D = 2, ELD_VER_PARTIAL = 31, }; enum cea_edid_versions { CEA_EDID_VER_NONE = 0, CEA_EDID_VER_CEA861 = 1, CEA_EDID_VER_CEA861A = 2, CEA_EDID_VER_CEA861BCD = 3, CEA_EDID_VER_RESERVED = 4, }; static const char * const eld_connection_type_names[4] = { "HDMI", "DisplayPort", "2-reserved", "3-reserved" }; enum cea_audio_coding_types { AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0, AUDIO_CODING_TYPE_LPCM = 1, AUDIO_CODING_TYPE_AC3 = 2, AUDIO_CODING_TYPE_MPEG1 = 3, AUDIO_CODING_TYPE_MP3 = 4, AUDIO_CODING_TYPE_MPEG2 = 5, AUDIO_CODING_TYPE_AACLC = 6, AUDIO_CODING_TYPE_DTS = 7, AUDIO_CODING_TYPE_ATRAC = 8, AUDIO_CODING_TYPE_SACD = 9, AUDIO_CODING_TYPE_EAC3 = 10, AUDIO_CODING_TYPE_DTS_HD = 11, AUDIO_CODING_TYPE_MLP = 12, AUDIO_CODING_TYPE_DST = 13, AUDIO_CODING_TYPE_WMAPRO = 14, AUDIO_CODING_TYPE_REF_CXT = 15, /* also include valid xtypes below */ AUDIO_CODING_TYPE_HE_AAC = 15, AUDIO_CODING_TYPE_HE_AAC2 = 16, AUDIO_CODING_TYPE_MPEG_SURROUND = 17, }; enum cea_audio_coding_xtypes { AUDIO_CODING_XTYPE_HE_REF_CT = 0, AUDIO_CODING_XTYPE_HE_AAC = 1, AUDIO_CODING_XTYPE_HE_AAC2 = 2, AUDIO_CODING_XTYPE_MPEG_SURROUND = 3, AUDIO_CODING_XTYPE_FIRST_RESERVED = 4, }; static const char * const cea_audio_coding_type_names[] = { /* 0 */ "undefined", /* 1 */ "LPCM", /* 2 */ "AC-3", /* 3 */ "MPEG1", /* 4 */ "MP3", /* 5 */ "MPEG2", /* 6 */ "AAC-LC", /* 7 */ "DTS", /* 8 */ "ATRAC", /* 9 */ "DSD (One Bit Audio)", /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)", /* 11 */ "DTS-HD", /* 12 */ "MLP (Dolby TrueHD)", /* 13 */ "DST", /* 14 */ "WMAPro", /* 15 */ "HE-AAC", /* 16 */ "HE-AACv2", /* 17 */ "MPEG Surround", }; /* * The following two lists are shared between * - HDMI audio InfoFrame (source to sink) * - CEA E-EDID Extension (sink to source) */ /* * SS1:SS0 index => sample size */ static const int cea_sample_sizes[4] = { 0, /* 0: Refer to Stream Header */ AC_SUPPCM_BITS_16, /* 1: 16 bits */ AC_SUPPCM_BITS_20, /* 2: 20 bits */ AC_SUPPCM_BITS_24, /* 3: 24 bits */ }; /* * SF2:SF1:SF0 index => sampling frequency */ static const int cea_sampling_frequencies[8] = { 0, /* 0: Refer to Stream Header */ SNDRV_PCM_RATE_32000, /* 1: 32000Hz */ SNDRV_PCM_RATE_44100, /* 2: 44100Hz */ SNDRV_PCM_RATE_48000, /* 3: 48000Hz */ SNDRV_PCM_RATE_88200, /* 4: 88200Hz */ SNDRV_PCM_RATE_96000, /* 5: 96000Hz */ SNDRV_PCM_RATE_176400, /* 6: 176400Hz */ SNDRV_PCM_RATE_192000, /* 7: 192000Hz */ }; static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid, int byte_index) { unsigned int val; val = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_ELDD, byte_index); #ifdef BE_PARANOID codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val); #endif return val; } #define GRAB_BITS(buf, byte, lowbit, bits) \ ({ \ BUILD_BUG_ON(lowbit > 7); \ BUILD_BUG_ON(bits > 8); \ BUILD_BUG_ON(bits <= 0); \ \ (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \ }) static void hdmi_update_short_audio_desc(struct hda_codec *codec, struct cea_sad *a, const unsigned char *buf) { int i; int val; val = GRAB_BITS(buf, 1, 0, 7); a->rates = 0; for (i = 0; i < 7; i++) if (val & (1 << i)) a->rates |= cea_sampling_frequencies[i + 1]; a->channels = GRAB_BITS(buf, 0, 0, 3); a->channels++; a->sample_bits = 0; a->max_bitrate = 0; a->format = GRAB_BITS(buf, 0, 3, 4); switch (a->format) { case AUDIO_CODING_TYPE_REF_STREAM_HEADER: codec_info(codec, "HDMI: audio coding type 0 not expected\n"); break; case AUDIO_CODING_TYPE_LPCM: val = GRAB_BITS(buf, 2, 0, 3); for (i = 0; i < 3; i++) if (val & (1 << i)) a->sample_bits |= cea_sample_sizes[i + 1]; break; case AUDIO_CODING_TYPE_AC3: case AUDIO_CODING_TYPE_MPEG1: case AUDIO_CODING_TYPE_MP3: case AUDIO_CODING_TYPE_MPEG2: case AUDIO_CODING_TYPE_AACLC: case AUDIO_CODING_TYPE_DTS: case AUDIO_CODING_TYPE_ATRAC: a->max_bitrate = GRAB_BITS(buf, 2, 0, 8); a->max_bitrate *= 8000; break; case AUDIO_CODING_TYPE_SACD: break; case AUDIO_CODING_TYPE_EAC3: break; case AUDIO_CODING_TYPE_DTS_HD: break; case AUDIO_CODING_TYPE_MLP: break; case AUDIO_CODING_TYPE_DST: break; case AUDIO_CODING_TYPE_WMAPRO: a->profile = GRAB_BITS(buf, 2, 0, 3); break; case AUDIO_CODING_TYPE_REF_CXT: a->format = GRAB_BITS(buf, 2, 3, 5); if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT || a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) { codec_info(codec, "HDMI: audio coding xtype %d not expected\n", a->format); a->format = 0; } else a->format += AUDIO_CODING_TYPE_HE_AAC - AUDIO_CODING_XTYPE_HE_AAC; break; } } /* * Be careful, ELD buf could be totally rubbish! */ int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e, const unsigned char *buf, int size) { int mnl; int i; memset(e, 0, sizeof(*e)); e->eld_ver = GRAB_BITS(buf, 0, 3, 5); if (e->eld_ver != ELD_VER_CEA_861D && e->eld_ver != ELD_VER_PARTIAL) { codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver); goto out_fail; } e->baseline_len = GRAB_BITS(buf, 2, 0, 8); mnl = GRAB_BITS(buf, 4, 0, 5); e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3); e->support_hdcp = GRAB_BITS(buf, 5, 0, 1); e->support_ai = GRAB_BITS(buf, 5, 1, 1); e->conn_type = GRAB_BITS(buf, 5, 2, 2); e->sad_count = GRAB_BITS(buf, 5, 4, 4); e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2; e->spk_alloc = GRAB_BITS(buf, 7, 0, 7); e->port_id = get_unaligned_le64(buf + 8); /* not specified, but the spec's tendency is little endian */ e->manufacture_id = get_unaligned_le16(buf + 16); e->product_id = get_unaligned_le16(buf + 18); if (mnl > ELD_MAX_MNL) { codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl); goto out_fail; } else if (ELD_FIXED_BYTES + mnl > size) { codec_info(codec, "HDMI: out of range MNL %d\n", mnl); goto out_fail; } else strscpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1); for (i = 0; i < e->sad_count; i++) { if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) { codec_info(codec, "HDMI: out of range SAD %d\n", i); goto out_fail; } hdmi_update_short_audio_desc(codec, e->sad + i, buf + ELD_FIXED_BYTES + mnl + 3 * i); } /* * HDMI sink's ELD info cannot always be retrieved for now, e.g. * in console or for audio devices. Assume the highest speakers * configuration, to _not_ prohibit multi-channel audio playback. */ if (!e->spk_alloc) e->spk_alloc = 0xffff; return 0; out_fail: return -EINVAL; } int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) { return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, AC_DIPSIZE_ELD_BUF); } int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid, unsigned char *buf, int *eld_size) { int i; int ret = 0; int size; /* * ELD size is initialized to zero in caller function. If no errors and * ELD is valid, actual eld_size is assigned. */ size = snd_hdmi_get_eld_size(codec, nid); if (size == 0) { /* wfg: workaround for ASUS P5E-VM HDMI board */ codec_info(codec, "HDMI: ELD buf size is 0, force 128\n"); size = 128; } if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) { codec_info(codec, "HDMI: invalid ELD buf size %d\n", size); return -ERANGE; } /* set ELD buffer */ for (i = 0; i < size; i++) { unsigned int val = hdmi_get_eld_data(codec, nid, i); /* * Graphics driver might be writing to ELD buffer right now. * Just abort. The caller will repoll after a while. */ if (!(val & AC_ELDD_ELD_VALID)) { codec_info(codec, "HDMI: invalid ELD data byte %d\n", i); ret = -EINVAL; goto error; } val &= AC_ELDD_ELD_DATA; /* * The first byte cannot be zero. This can happen on some DVI * connections. Some Intel chips may also need some 250ms delay * to return non-zero ELD data, even when the graphics driver * correctly writes ELD content before setting ELD_valid bit. */ if (!val && !i) { codec_dbg(codec, "HDMI: 0 ELD data\n"); ret = -EINVAL; goto error; } buf[i] = val; } *eld_size = size; error: return ret; } /* * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with * hdmi-specific routine. */ static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen) { static const unsigned int alsa_rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000, 176400, 192000, 384000 }; int i, j; for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++) if (pcm & (1 << i)) j += scnprintf(buf + j, buflen - j, " %d", alsa_rates[i]); buf[j] = '\0'; /* necessary when j == 0 */ } #define SND_PRINT_RATES_ADVISED_BUFSIZE 80 static void hdmi_show_short_audio_desc(struct hda_codec *codec, struct cea_sad *a) { char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; if (!a->format) return; hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); if (a->format == AUDIO_CODING_TYPE_LPCM) snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8); else if (a->max_bitrate) snprintf(buf2, sizeof(buf2), ", max bitrate = %d", a->max_bitrate); else buf2[0] = '\0'; codec_dbg(codec, "HDMI: supports coding type %s: channels = %d, rates =%s%s\n", cea_audio_coding_type_names[a->format], a->channels, buf, buf2); } void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e) { int i; codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n", e->monitor_name, eld_connection_type_names[e->conn_type]); if (e->spk_alloc) { char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); codec_dbg(codec, "HDMI: available speakers:%s\n", buf); } for (i = 0; i < e->sad_count; i++) hdmi_show_short_audio_desc(codec, e->sad + i); } #ifdef CONFIG_SND_PROC_FS static void hdmi_print_sad_info(int i, struct cea_sad *a, struct snd_info_buffer *buffer) { char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", i, a->format, cea_audio_coding_type_names[a->format]); snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); if (a->format == AUDIO_CODING_TYPE_LPCM) { snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", i, a->sample_bits, buf); } if (a->max_bitrate) snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", i, a->max_bitrate); if (a->profile) snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); } void snd_hdmi_print_eld_info(struct hdmi_eld *eld, struct snd_info_buffer *buffer) { struct parsed_hdmi_eld *e = &eld->info; char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; int i; static const char * const eld_version_names[32] = { "reserved", "reserved", "CEA-861D or below", [3 ... 30] = "reserved", [31] = "partial" }; static const char * const cea_edid_version_names[8] = { "no CEA EDID Timing Extension block present", "CEA-861", "CEA-861-A", "CEA-861-B, C or D", [4 ... 7] = "reserved" }; snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present); snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid); if (!eld->eld_valid) return; snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); snd_iprintf(buffer, "connection_type\t\t%s\n", eld_connection_type_names[e->conn_type]); snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, eld_version_names[e->eld_ver]); snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, cea_edid_version_names[e->cea_edid_ver]); snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); for (i = 0; i < e->sad_count; i++) hdmi_print_sad_info(i, e->sad + i, buffer); } void snd_hdmi_write_eld_info(struct hdmi_eld *eld, struct snd_info_buffer *buffer) { struct parsed_hdmi_eld *e = &eld->info; char line[64]; char name[64]; char *sname; long long val; unsigned int n; while (!snd_info_get_line(buffer, line, sizeof(line))) { if (sscanf(line, "%s %llx", name, &val) != 2) continue; /* * We don't allow modification to these fields: * monitor_name manufacture_id product_id * eld_version edid_version */ if (!strcmp(name, "monitor_present")) eld->monitor_present = val; else if (!strcmp(name, "eld_valid")) eld->eld_valid = val; else if (!strcmp(name, "connection_type")) e->conn_type = val; else if (!strcmp(name, "port_id")) e->port_id = val; else if (!strcmp(name, "support_hdcp")) e->support_hdcp = val; else if (!strcmp(name, "support_ai")) e->support_ai = val; else if (!strcmp(name, "audio_sync_delay")) e->aud_synch_delay = val; else if (!strcmp(name, "speakers")) e->spk_alloc = val; else if (!strcmp(name, "sad_count")) e->sad_count = val; else if (!strncmp(name, "sad", 3)) { sname = name + 4; n = name[3] - '0'; if (name[4] >= '0' && name[4] <= '9') { sname++; n = 10 * n + name[4] - '0'; } if (n >= ELD_MAX_SAD) continue; if (!strcmp(sname, "_coding_type")) e->sad[n].format = val; else if (!strcmp(sname, "_channels")) e->sad[n].channels = val; else if (!strcmp(sname, "_rates")) e->sad[n].rates = val; else if (!strcmp(sname, "_bits")) e->sad[n].sample_bits = val; else if (!strcmp(sname, "_max_bitrate")) e->sad[n].max_bitrate = val; else if (!strcmp(sname, "_profile")) e->sad[n].profile = val; if (n >= e->sad_count) e->sad_count = n + 1; } } } #endif /* CONFIG_SND_PROC_FS */ /* update PCM info based on ELD */ void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e, struct hda_pcm_stream *hinfo) { u32 rates; u64 formats; unsigned int maxbps; unsigned int channels_max; int i; /* assume basic audio support (the basic audio flag is not in ELD; * however, all audio capable sinks are required to support basic * audio) */ rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000; formats = SNDRV_PCM_FMTBIT_S16_LE; maxbps = 16; channels_max = 2; for (i = 0; i < e->sad_count; i++) { struct cea_sad *a = &e->sad[i]; rates |= a->rates; if (a->channels > channels_max) channels_max = a->channels; if (a->format == AUDIO_CODING_TYPE_LPCM) { if (a->sample_bits & AC_SUPPCM_BITS_20) { formats |= SNDRV_PCM_FMTBIT_S32_LE; if (maxbps < 20) maxbps = 20; } if (a->sample_bits & AC_SUPPCM_BITS_24) { formats |= SNDRV_PCM_FMTBIT_S32_LE; if (maxbps < 24) maxbps = 24; } } } /* restrict the parameters by the values the codec provides */ hinfo->rates &= rates; hinfo->formats &= formats; hinfo->maxbps = min(hinfo->maxbps, maxbps); hinfo->channels_max = min(hinfo->channels_max, channels_max); } /* ATI/AMD specific stuff (ELD emulation) */ #define ATI_VERB_SET_AUDIO_DESCRIPTOR 0x776 #define ATI_VERB_SET_SINK_INFO_INDEX 0x780 #define ATI_VERB_GET_SPEAKER_ALLOCATION 0xf70 #define ATI_VERB_GET_AUDIO_DESCRIPTOR 0xf76 #define ATI_VERB_GET_AUDIO_VIDEO_DELAY 0xf7b #define ATI_VERB_GET_SINK_INFO_INDEX 0xf80 #define ATI_VERB_GET_SINK_INFO_DATA 0xf81 #define ATI_SPKALLOC_SPKALLOC 0x007f #define ATI_SPKALLOC_TYPE_HDMI 0x0100 #define ATI_SPKALLOC_TYPE_DISPLAYPORT 0x0200 /* first three bytes are just standard SAD */ #define ATI_AUDIODESC_CHANNELS 0x00000007 #define ATI_AUDIODESC_RATES 0x0000ff00 #define ATI_AUDIODESC_LPCM_STEREO_RATES 0xff000000 /* in standard HDMI VSDB format */ #define ATI_DELAY_VIDEO_LATENCY 0x000000ff #define ATI_DELAY_AUDIO_LATENCY 0x0000ff00 enum ati_sink_info_idx { ATI_INFO_IDX_MANUFACTURER_ID = 0, ATI_INFO_IDX_PRODUCT_ID = 1, ATI_INFO_IDX_SINK_DESC_LEN = 2, ATI_INFO_IDX_PORT_ID_LOW = 3, ATI_INFO_IDX_PORT_ID_HIGH = 4, ATI_INFO_IDX_SINK_DESC_FIRST = 5, ATI_INFO_IDX_SINK_DESC_LAST = 22, /* max len 18 bytes */ }; int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid, unsigned char *buf, int *eld_size, bool rev3_or_later) { int spkalloc, ati_sad, aud_synch; int sink_desc_len = 0; int pos, i; /* ATI/AMD does not have ELD, emulate it */ spkalloc = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SPEAKER_ALLOCATION, 0); if (spkalloc <= 0) { codec_info(codec, "HDMI ATI/AMD: no speaker allocation for ELD\n"); return -EINVAL; } memset(buf, 0, ELD_FIXED_BYTES + ELD_MAX_MNL + ELD_MAX_SAD * 3); /* version */ buf[0] = ELD_VER_CEA_861D << 3; /* speaker allocation from EDID */ buf[7] = spkalloc & ATI_SPKALLOC_SPKALLOC; /* is DisplayPort? */ if (spkalloc & ATI_SPKALLOC_TYPE_DISPLAYPORT) buf[5] |= 0x04; pos = ELD_FIXED_BYTES; if (rev3_or_later) { int sink_info; snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_LOW); sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); put_unaligned_le32(sink_info, buf + 8); snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PORT_ID_HIGH); sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); put_unaligned_le32(sink_info, buf + 12); snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_MANUFACTURER_ID); sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); put_unaligned_le16(sink_info, buf + 16); snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_PRODUCT_ID); sink_info = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); put_unaligned_le16(sink_info, buf + 18); snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_LEN); sink_desc_len = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); if (sink_desc_len > ELD_MAX_MNL) { codec_info(codec, "HDMI ATI/AMD: Truncating HDMI sink description with length %d\n", sink_desc_len); sink_desc_len = ELD_MAX_MNL; } buf[4] |= sink_desc_len; for (i = 0; i < sink_desc_len; i++) { snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_SINK_INFO_INDEX, ATI_INFO_IDX_SINK_DESC_FIRST + i); buf[pos++] = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_SINK_INFO_DATA, 0); } } for (i = AUDIO_CODING_TYPE_LPCM; i <= AUDIO_CODING_TYPE_WMAPRO; i++) { if (i == AUDIO_CODING_TYPE_SACD || i == AUDIO_CODING_TYPE_DST) continue; /* not handled by ATI/AMD */ snd_hda_codec_write(codec, nid, 0, ATI_VERB_SET_AUDIO_DESCRIPTOR, i << 3); ati_sad = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_DESCRIPTOR, 0); if (ati_sad <= 0) continue; if (ati_sad & ATI_AUDIODESC_RATES) { /* format is supported, copy SAD as-is */ buf[pos++] = (ati_sad & 0x0000ff) >> 0; buf[pos++] = (ati_sad & 0x00ff00) >> 8; buf[pos++] = (ati_sad & 0xff0000) >> 16; } if (i == AUDIO_CODING_TYPE_LPCM && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) && (ati_sad & ATI_AUDIODESC_LPCM_STEREO_RATES) >> 16 != (ati_sad & ATI_AUDIODESC_RATES)) { /* for PCM there is a separate stereo rate mask */ buf[pos++] = ((ati_sad & 0x000000ff) & ~ATI_AUDIODESC_CHANNELS) | 0x1; /* rates from the extra byte */ buf[pos++] = (ati_sad & 0xff000000) >> 24; buf[pos++] = (ati_sad & 0x00ff0000) >> 16; } } if (pos == ELD_FIXED_BYTES + sink_desc_len) { codec_info(codec, "HDMI ATI/AMD: no audio descriptors for ELD\n"); return -EINVAL; } /* * HDMI VSDB latency format: * separately for both audio and video: * 0 field not valid or unknown latency * [1..251] msecs = (x-1)*2 (max 500ms with x = 251 = 0xfb) * 255 audio/video not supported * * HDA latency format: * single value indicating video latency relative to audio: * 0 unknown or 0ms * [1..250] msecs = x*2 (max 500ms with x = 250 = 0xfa) * [251..255] reserved */ aud_synch = snd_hda_codec_read(codec, nid, 0, ATI_VERB_GET_AUDIO_VIDEO_DELAY, 0); if ((aud_synch & ATI_DELAY_VIDEO_LATENCY) && (aud_synch & ATI_DELAY_AUDIO_LATENCY)) { int video_latency_hdmi = (aud_synch & ATI_DELAY_VIDEO_LATENCY); int audio_latency_hdmi = (aud_synch & ATI_DELAY_AUDIO_LATENCY) >> 8; if (video_latency_hdmi <= 0xfb && audio_latency_hdmi <= 0xfb && video_latency_hdmi > audio_latency_hdmi) buf[6] = video_latency_hdmi - audio_latency_hdmi; /* else unknown/invalid or 0ms or video ahead of audio, so use zero */ } /* SAD count */ buf[5] |= ((pos - ELD_FIXED_BYTES - sink_desc_len) / 3) << 4; /* Baseline ELD block length is 4-byte aligned */ pos = round_up(pos, 4); /* Baseline ELD length (4-byte header is not counted in) */ buf[2] = (pos - 4) / 4; *eld_size = pos; return 0; }