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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4bd038f9d8
Because the eld buffer can be simultaneously accessed from both workqueue context (updating) and process context (kcontrol read), we need to protect it with a mutex to guarantee consistency. To avoid holding the mutex while reading the ELD info from the codec, we introduce a temporary eld buffer. Signed-off-by: David Henningsson <david.henningsson@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
674 lines
18 KiB
C
674 lines
18 KiB
C
/*
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* Generic routines and proc interface for ELD(EDID Like Data) information
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*
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* Copyright(c) 2008 Intel Corporation.
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*
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* Authors:
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* Wu Fengguang <wfg@linux.intel.com>
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*
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* This driver is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <asm/unaligned.h>
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#include "hda_codec.h"
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#include "hda_local.h"
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enum eld_versions {
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ELD_VER_CEA_861D = 2,
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ELD_VER_PARTIAL = 31,
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};
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enum cea_edid_versions {
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CEA_EDID_VER_NONE = 0,
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CEA_EDID_VER_CEA861 = 1,
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CEA_EDID_VER_CEA861A = 2,
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CEA_EDID_VER_CEA861BCD = 3,
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CEA_EDID_VER_RESERVED = 4,
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};
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static char *cea_speaker_allocation_names[] = {
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/* 0 */ "FL/FR",
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/* 1 */ "LFE",
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/* 2 */ "FC",
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/* 3 */ "RL/RR",
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/* 4 */ "RC",
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/* 5 */ "FLC/FRC",
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/* 6 */ "RLC/RRC",
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/* 7 */ "FLW/FRW",
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/* 8 */ "FLH/FRH",
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/* 9 */ "TC",
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/* 10 */ "FCH",
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};
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static char *eld_connection_type_names[4] = {
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"HDMI",
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"DisplayPort",
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"2-reserved",
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"3-reserved"
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};
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enum cea_audio_coding_types {
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AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0,
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AUDIO_CODING_TYPE_LPCM = 1,
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AUDIO_CODING_TYPE_AC3 = 2,
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AUDIO_CODING_TYPE_MPEG1 = 3,
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AUDIO_CODING_TYPE_MP3 = 4,
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AUDIO_CODING_TYPE_MPEG2 = 5,
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AUDIO_CODING_TYPE_AACLC = 6,
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AUDIO_CODING_TYPE_DTS = 7,
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AUDIO_CODING_TYPE_ATRAC = 8,
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AUDIO_CODING_TYPE_SACD = 9,
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AUDIO_CODING_TYPE_EAC3 = 10,
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AUDIO_CODING_TYPE_DTS_HD = 11,
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AUDIO_CODING_TYPE_MLP = 12,
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AUDIO_CODING_TYPE_DST = 13,
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AUDIO_CODING_TYPE_WMAPRO = 14,
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AUDIO_CODING_TYPE_REF_CXT = 15,
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/* also include valid xtypes below */
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AUDIO_CODING_TYPE_HE_AAC = 15,
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AUDIO_CODING_TYPE_HE_AAC2 = 16,
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AUDIO_CODING_TYPE_MPEG_SURROUND = 17,
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};
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enum cea_audio_coding_xtypes {
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AUDIO_CODING_XTYPE_HE_REF_CT = 0,
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AUDIO_CODING_XTYPE_HE_AAC = 1,
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AUDIO_CODING_XTYPE_HE_AAC2 = 2,
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AUDIO_CODING_XTYPE_MPEG_SURROUND = 3,
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AUDIO_CODING_XTYPE_FIRST_RESERVED = 4,
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};
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static char *cea_audio_coding_type_names[] = {
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/* 0 */ "undefined",
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/* 1 */ "LPCM",
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/* 2 */ "AC-3",
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/* 3 */ "MPEG1",
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/* 4 */ "MP3",
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/* 5 */ "MPEG2",
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/* 6 */ "AAC-LC",
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/* 7 */ "DTS",
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/* 8 */ "ATRAC",
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/* 9 */ "DSD (One Bit Audio)",
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/* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
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/* 11 */ "DTS-HD",
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/* 12 */ "MLP (Dolby TrueHD)",
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/* 13 */ "DST",
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/* 14 */ "WMAPro",
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/* 15 */ "HE-AAC",
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/* 16 */ "HE-AACv2",
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/* 17 */ "MPEG Surround",
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};
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/*
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* The following two lists are shared between
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* - HDMI audio InfoFrame (source to sink)
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* - CEA E-EDID Extension (sink to source)
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*/
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/*
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* SS1:SS0 index => sample size
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*/
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static int cea_sample_sizes[4] = {
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0, /* 0: Refer to Stream Header */
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AC_SUPPCM_BITS_16, /* 1: 16 bits */
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AC_SUPPCM_BITS_20, /* 2: 20 bits */
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AC_SUPPCM_BITS_24, /* 3: 24 bits */
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};
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/*
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* SF2:SF1:SF0 index => sampling frequency
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*/
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static int cea_sampling_frequencies[8] = {
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0, /* 0: Refer to Stream Header */
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SNDRV_PCM_RATE_32000, /* 1: 32000Hz */
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SNDRV_PCM_RATE_44100, /* 2: 44100Hz */
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SNDRV_PCM_RATE_48000, /* 3: 48000Hz */
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SNDRV_PCM_RATE_88200, /* 4: 88200Hz */
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SNDRV_PCM_RATE_96000, /* 5: 96000Hz */
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SNDRV_PCM_RATE_176400, /* 6: 176400Hz */
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SNDRV_PCM_RATE_192000, /* 7: 192000Hz */
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};
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static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
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int byte_index)
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{
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unsigned int val;
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val = snd_hda_codec_read(codec, nid, 0,
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AC_VERB_GET_HDMI_ELDD, byte_index);
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#ifdef BE_PARANOID
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printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
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#endif
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return val;
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}
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#define GRAB_BITS(buf, byte, lowbit, bits) \
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({ \
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BUILD_BUG_ON(lowbit > 7); \
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BUILD_BUG_ON(bits > 8); \
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BUILD_BUG_ON(bits <= 0); \
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\
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(buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \
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})
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static void hdmi_update_short_audio_desc(struct cea_sad *a,
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const unsigned char *buf)
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{
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int i;
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int val;
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val = GRAB_BITS(buf, 1, 0, 7);
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a->rates = 0;
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for (i = 0; i < 7; i++)
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if (val & (1 << i))
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a->rates |= cea_sampling_frequencies[i + 1];
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a->channels = GRAB_BITS(buf, 0, 0, 3);
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a->channels++;
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a->sample_bits = 0;
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a->max_bitrate = 0;
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a->format = GRAB_BITS(buf, 0, 3, 4);
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switch (a->format) {
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case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
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snd_printd(KERN_INFO
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"HDMI: audio coding type 0 not expected\n");
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break;
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case AUDIO_CODING_TYPE_LPCM:
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val = GRAB_BITS(buf, 2, 0, 3);
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for (i = 0; i < 3; i++)
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if (val & (1 << i))
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a->sample_bits |= cea_sample_sizes[i + 1];
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break;
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case AUDIO_CODING_TYPE_AC3:
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case AUDIO_CODING_TYPE_MPEG1:
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case AUDIO_CODING_TYPE_MP3:
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case AUDIO_CODING_TYPE_MPEG2:
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case AUDIO_CODING_TYPE_AACLC:
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case AUDIO_CODING_TYPE_DTS:
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case AUDIO_CODING_TYPE_ATRAC:
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a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
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a->max_bitrate *= 8000;
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break;
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case AUDIO_CODING_TYPE_SACD:
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break;
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case AUDIO_CODING_TYPE_EAC3:
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break;
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case AUDIO_CODING_TYPE_DTS_HD:
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break;
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case AUDIO_CODING_TYPE_MLP:
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break;
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case AUDIO_CODING_TYPE_DST:
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break;
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case AUDIO_CODING_TYPE_WMAPRO:
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a->profile = GRAB_BITS(buf, 2, 0, 3);
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break;
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case AUDIO_CODING_TYPE_REF_CXT:
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a->format = GRAB_BITS(buf, 2, 3, 5);
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if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
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a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
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snd_printd(KERN_INFO
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"HDMI: audio coding xtype %d not expected\n",
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a->format);
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a->format = 0;
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} else
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a->format += AUDIO_CODING_TYPE_HE_AAC -
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AUDIO_CODING_XTYPE_HE_AAC;
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break;
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}
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}
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/*
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* Be careful, ELD buf could be totally rubbish!
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*/
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int snd_hdmi_parse_eld(struct parsed_hdmi_eld *e,
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const unsigned char *buf, int size)
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{
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int mnl;
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int i;
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e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
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if (e->eld_ver != ELD_VER_CEA_861D &&
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e->eld_ver != ELD_VER_PARTIAL) {
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snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
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e->eld_ver);
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goto out_fail;
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}
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e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
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mnl = GRAB_BITS(buf, 4, 0, 5);
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e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
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e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
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e->support_ai = GRAB_BITS(buf, 5, 1, 1);
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e->conn_type = GRAB_BITS(buf, 5, 2, 2);
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e->sad_count = GRAB_BITS(buf, 5, 4, 4);
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e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
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e->spk_alloc = GRAB_BITS(buf, 7, 0, 7);
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e->port_id = get_unaligned_le64(buf + 8);
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/* not specified, but the spec's tendency is little endian */
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e->manufacture_id = get_unaligned_le16(buf + 16);
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e->product_id = get_unaligned_le16(buf + 18);
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if (mnl > ELD_MAX_MNL) {
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snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
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goto out_fail;
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} else if (ELD_FIXED_BYTES + mnl > size) {
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snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
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goto out_fail;
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} else
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strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
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for (i = 0; i < e->sad_count; i++) {
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if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
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snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
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goto out_fail;
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}
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hdmi_update_short_audio_desc(e->sad + i,
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buf + ELD_FIXED_BYTES + mnl + 3 * i);
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}
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/*
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* HDMI sink's ELD info cannot always be retrieved for now, e.g.
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* in console or for audio devices. Assume the highest speakers
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* configuration, to _not_ prohibit multi-channel audio playback.
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*/
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if (!e->spk_alloc)
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e->spk_alloc = 0xffff;
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return 0;
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out_fail:
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return -EINVAL;
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}
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int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
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{
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return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
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AC_DIPSIZE_ELD_BUF);
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}
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int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
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unsigned char *buf, int *eld_size)
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{
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int i;
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int ret;
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int size;
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/*
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* ELD size is initialized to zero in caller function. If no errors and
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* ELD is valid, actual eld_size is assigned.
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*/
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size = snd_hdmi_get_eld_size(codec, nid);
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if (size == 0) {
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/* wfg: workaround for ASUS P5E-VM HDMI board */
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snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
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size = 128;
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}
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if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
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snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
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return -ERANGE;
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}
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/* set ELD buffer */
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for (i = 0; i < size; i++) {
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unsigned int val = hdmi_get_eld_data(codec, nid, i);
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/*
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* Graphics driver might be writing to ELD buffer right now.
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* Just abort. The caller will repoll after a while.
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*/
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if (!(val & AC_ELDD_ELD_VALID)) {
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snd_printd(KERN_INFO
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"HDMI: invalid ELD data byte %d\n", i);
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ret = -EINVAL;
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goto error;
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}
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val &= AC_ELDD_ELD_DATA;
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/*
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* The first byte cannot be zero. This can happen on some DVI
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* connections. Some Intel chips may also need some 250ms delay
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* to return non-zero ELD data, even when the graphics driver
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* correctly writes ELD content before setting ELD_valid bit.
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*/
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if (!val && !i) {
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snd_printdd(KERN_INFO "HDMI: 0 ELD data\n");
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ret = -EINVAL;
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goto error;
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}
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buf[i] = val;
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}
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*eld_size = size;
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error:
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return ret;
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}
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/**
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* SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
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* hdmi-specific routine.
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*/
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static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
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{
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static unsigned int alsa_rates[] = {
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5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
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88200, 96000, 176400, 192000, 384000
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};
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int i, j;
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for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
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if (pcm & (1 << i))
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j += snprintf(buf + j, buflen - j, " %d",
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alsa_rates[i]);
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buf[j] = '\0'; /* necessary when j == 0 */
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}
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#define SND_PRINT_RATES_ADVISED_BUFSIZE 80
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static void hdmi_show_short_audio_desc(struct cea_sad *a)
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{
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char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
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char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
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if (!a->format)
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return;
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hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
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if (a->format == AUDIO_CODING_TYPE_LPCM)
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snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
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else if (a->max_bitrate)
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snprintf(buf2, sizeof(buf2),
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", max bitrate = %d", a->max_bitrate);
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else
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buf2[0] = '\0';
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_snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:"
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" channels = %d, rates =%s%s\n",
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cea_audio_coding_type_names[a->format],
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a->channels,
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buf,
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buf2);
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}
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void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
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{
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int i, j;
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for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
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if (spk_alloc & (1 << i))
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j += snprintf(buf + j, buflen - j, " %s",
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cea_speaker_allocation_names[i]);
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}
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buf[j] = '\0'; /* necessary when j == 0 */
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}
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void snd_hdmi_show_eld(struct parsed_hdmi_eld *e)
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{
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int i;
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_snd_printd(SND_PR_VERBOSE, "HDMI: detected monitor %s at connection type %s\n",
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e->monitor_name,
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eld_connection_type_names[e->conn_type]);
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if (e->spk_alloc) {
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char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
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snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
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_snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf);
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}
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for (i = 0; i < e->sad_count; i++)
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hdmi_show_short_audio_desc(e->sad + i);
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}
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#ifdef CONFIG_PROC_FS
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static void hdmi_print_sad_info(int i, struct cea_sad *a,
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struct snd_info_buffer *buffer)
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{
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char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
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snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
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i, a->format, cea_audio_coding_type_names[a->format]);
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snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
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hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
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snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
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|
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);
|
|
}
|
|
|
|
static void hdmi_print_eld_info(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct hdmi_eld *eld = entry->private_data;
|
|
struct parsed_hdmi_eld *e = &eld->info;
|
|
char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
|
|
int i;
|
|
static char *eld_version_names[32] = {
|
|
"reserved",
|
|
"reserved",
|
|
"CEA-861D or below",
|
|
[3 ... 30] = "reserved",
|
|
[31] = "partial"
|
|
};
|
|
static char *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"
|
|
};
|
|
|
|
mutex_lock(&eld->lock);
|
|
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) {
|
|
mutex_unlock(&eld->lock);
|
|
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_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);
|
|
mutex_unlock(&eld->lock);
|
|
}
|
|
|
|
static void hdmi_write_eld_info(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct hdmi_eld *eld = entry->private_data;
|
|
struct parsed_hdmi_eld *e = &eld->info;
|
|
char line[64];
|
|
char name[64];
|
|
char *sname;
|
|
long long val;
|
|
unsigned int n;
|
|
|
|
mutex_lock(&eld->lock);
|
|
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;
|
|
}
|
|
}
|
|
mutex_unlock(&eld->lock);
|
|
}
|
|
|
|
|
|
int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
|
|
int index)
|
|
{
|
|
char name[32];
|
|
struct snd_info_entry *entry;
|
|
int err;
|
|
|
|
snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
|
|
err = snd_card_proc_new(codec->bus->card, name, &entry);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
|
|
entry->c.text.write = hdmi_write_eld_info;
|
|
entry->mode |= S_IWUSR;
|
|
eld->proc_entry = entry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
|
|
{
|
|
if (!codec->bus->shutdown && eld->proc_entry) {
|
|
snd_device_free(codec->bus->card, eld->proc_entry);
|
|
eld->proc_entry = NULL;
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_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);
|
|
}
|