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path: root/sound/pci/hda/hda_eld.c
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Diffstat (limited to 'sound/pci/hda/hda_eld.c')
-rw-r--r--sound/pci/hda/hda_eld.c406
1 files changed, 311 insertions, 95 deletions
diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index fcad5ec3177..46690a7f48f 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -2,6 +2,7 @@
* 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>
@@ -22,6 +23,7 @@
*/
#include <linux/init.h>
+#include <linux/slab.h>
#include <sound/core.h>
#include <asm/unaligned.h>
#include "hda_codec.h"
@@ -143,25 +145,17 @@ static int cea_sampling_frequencies[8] = {
SNDRV_PCM_RATE_192000, /* 7: 192000Hz */
};
-static unsigned char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
+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
- printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
+ codec_info(codec, "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
#endif
-
- if ((val & AC_ELDD_ELD_VALID) == 0) {
- snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
- byte_index);
- val = 0;
- }
-
- return val & AC_ELDD_ELD_DATA;
+ return val;
}
#define GRAB_BITS(buf, byte, lowbit, bits) \
@@ -188,6 +182,9 @@ static void hdmi_update_short_audio_desc(struct cea_sad *a,
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:
@@ -197,7 +194,6 @@ static void hdmi_update_short_audio_desc(struct cea_sad *a,
case AUDIO_CODING_TYPE_LPCM:
val = GRAB_BITS(buf, 2, 0, 3);
- a->sample_bits = 0;
for (i = 0; i < 3; i++)
if (val & (1 << i))
a->sample_bits |= cea_sample_sizes[i + 1];
@@ -251,8 +247,8 @@ static void hdmi_update_short_audio_desc(struct cea_sad *a,
/*
* Be careful, ELD buf could be totally rubbish!
*/
-static int hdmi_update_eld(struct hdmi_eld *e,
- const unsigned char *buf, int size)
+int snd_hdmi_parse_eld(struct parsed_hdmi_eld *e,
+ const unsigned char *buf, int size)
{
int mnl;
int i;
@@ -265,7 +261,6 @@ static int hdmi_update_eld(struct hdmi_eld *e,
goto out_fail;
}
- e->eld_size = size;
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);
@@ -291,7 +286,7 @@ static int hdmi_update_eld(struct hdmi_eld *e,
snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
goto out_fail;
} else
- strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
+ strlcpy(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) {
@@ -302,76 +297,103 @@ static int hdmi_update_eld(struct hdmi_eld *e,
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:
- e->eld_ver = 0;
return -EINVAL;
}
-static int hdmi_present_sense(struct hda_codec *codec, hda_nid_t nid)
-{
- return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PIN_SENSE, 0);
-}
-
-static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
-{
- int eldv;
- int present;
-
- present = hdmi_present_sense(codec, nid);
- eldv = (present & AC_PINSENSE_ELDV);
- present = (present & AC_PINSENSE_PRESENCE);
-
-#ifdef CONFIG_SND_DEBUG_VERBOSE
- printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
- !!present, !!eldv);
-#endif
-
- return eldv && present;
-}
-
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 hdmi_eld *eld,
- struct hda_codec *codec, hda_nid_t nid)
+int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
+ unsigned char *buf, int *eld_size)
{
int i;
- int ret;
+ int ret = 0;
int size;
- unsigned char *buf;
- if (!hdmi_eld_valid(codec, nid))
- return -ENOENT;
+ /*
+ * 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 */
- snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
+ codec_info(codec, "HDMI: ELD buf size is 0, force 128\n");
size = 128;
}
- if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
- snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
+ if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
+ codec_info(codec, "HDMI: invalid ELD buf size %d\n", size);
return -ERANGE;
}
- buf = kmalloc(size, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ /* 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;
+ }
- for (i = 0; i < size; i++)
- buf[i] = hdmi_get_eld_byte(codec, nid, i);
+ *eld_size = size;
+error:
+ return ret;
+}
- ret = hdmi_update_eld(eld, buf, size);
+/**
+ * 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 unsigned int alsa_rates[] = {
+ 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
+ 88200, 96000, 176400, 192000, 384000
+ };
+ int i, j;
- kfree(buf);
- return ret;
+ for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
+ if (pcm & (1 << i))
+ j += snprintf(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 cea_sad *a)
{
char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
@@ -380,17 +402,17 @@ static void hdmi_show_short_audio_desc(struct cea_sad *a)
if (!a->format)
return;
- snd_print_pcm_rates(a->rates, buf, sizeof(buf));
+ 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));
+ 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';
- printk(KERN_INFO "HDMI: supports coding type %s:"
+ _snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:"
" channels = %d, rates =%s%s\n",
cea_audio_coding_type_names[a->format],
a->channels,
@@ -410,18 +432,18 @@ void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
buf[j] = '\0'; /* necessary when j == 0 */
}
-void snd_hdmi_show_eld(struct hdmi_eld *e)
+void snd_hdmi_show_eld(struct parsed_hdmi_eld *e)
{
int i;
- printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
+ _snd_printd(SND_PR_VERBOSE, "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_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
- printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
+ _snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf);
}
for (i = 0; i < e->sad_count; i++)
@@ -439,7 +461,7 @@ static void hdmi_print_sad_info(int i, struct cea_sad *a,
i, a->format, cea_audio_coding_type_names[a->format]);
snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
- snd_print_pcm_rates(a->rates, buf, sizeof(buf));
+ 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) {
@@ -456,13 +478,13 @@ static void hdmi_print_sad_info(int i, struct cea_sad *a,
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)
+void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer)
{
- struct hdmi_eld *e = entry->private_data;
+ struct parsed_hdmi_eld *e = &eld->info;
char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
int i;
- static char *eld_versoin_names[32] = {
+ static char *eld_version_names[32] = {
"reserved",
"reserved",
"CEA-861D or below",
@@ -477,11 +499,15 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
[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_versoin_names[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);
@@ -500,15 +526,15 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
hdmi_print_sad_info(i, e->sad + i, buffer);
}
-static void hdmi_write_eld_info(struct snd_info_entry *entry,
- struct snd_info_buffer *buffer)
+void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer)
{
- struct hdmi_eld *e = entry->private_data;
+ struct parsed_hdmi_eld *e = &eld->info;
char line[64];
char name[64];
char *sname;
long long val;
- int n;
+ unsigned int n;
while (!snd_info_get_line(buffer, line, sizeof(line))) {
if (sscanf(line, "%s %llx", name, &val) != 2)
@@ -518,7 +544,11 @@ static void hdmi_write_eld_info(struct snd_info_entry *entry,
* monitor_name manufacture_id product_id
* eld_version edid_version
*/
- if (!strcmp(name, "connection_type"))
+ 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;
@@ -539,7 +569,7 @@ static void hdmi_write_eld_info(struct snd_info_entry *entry,
sname++;
n = 10 * n + name[4] - '0';
}
- if (n < 0 || n > 31) /* double the CEA limit */
+ if (n >= ELD_MAX_SAD)
continue;
if (!strcmp(sname, "_coding_type"))
e->sad[n].format = val;
@@ -558,33 +588,219 @@ static void hdmi_write_eld_info(struct snd_info_entry *entry,
}
}
}
+#endif /* CONFIG_PROC_FS */
-
-int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
+/* update PCM info based on ELD */
+void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
+ struct hda_pcm_stream *hinfo)
{
- char name[32];
- struct snd_info_entry *entry;
- int err;
-
- snprintf(name, sizeof(name), "eld#%d", codec->addr);
- err = snd_card_proc_new(codec->bus->card, name, &entry);
- if (err < 0)
- return err;
+ u32 rates;
+ u64 formats;
+ unsigned int maxbps;
+ unsigned int channels_max;
+ int i;
- 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;
+ /* 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;
+ }
+ }
+ }
- return 0;
+ /* 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);
}
-void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
+
+/* 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)
{
- if (!codec->bus->shutdown && eld->proc_entry) {
- snd_device_free(codec->bus->card, eld->proc_entry);
- eld->proc_entry = NULL;
+ 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;
}
-}
-#endif /* CONFIG_PROC_FS */
+ 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;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-13 10:07:24 +0000