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kernel/sound/pci/hda/hda_eld.c

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// 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 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,
};
/*
* The following two lists are shared between
* - HDMI audio InfoFrame (source to sink)
* - CEA E-EDID Extension (sink to source)
*/
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;
}
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;
}
#ifdef CONFIG_SND_PROC_FS
void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
struct snd_info_buffer *buffer,
hda_nid_t pin_nid, int dev_id, hda_nid_t cvt_nid)
{
snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
snd_iprintf(buffer, "codec_pin_nid\t\t0x%x\n", pin_nid);
snd_iprintf(buffer, "codec_dev_id\t\t0x%x\n", dev_id);
snd_iprintf(buffer, "codec_cvt_nid\t\t0x%x\n", cvt_nid);
if (!eld->eld_valid)
return;
snd_print_eld_info(&eld->info, buffer);
}
void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
struct snd_info_buffer *buffer)
{
struct snd_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 snd_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 snd_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 & ELD_PCM_BITS_20) {
formats |= SNDRV_PCM_FMTBIT_S32_LE;
if (maxbps < 20)
maxbps = 20;
}
if (a->sample_bits & ELD_PCM_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;
}
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