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ALSA: intelhdmi - sticky stream id and format

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We tracked down the first-0.5s-hdmi-audio-samples-lost problem to the
AC_VERB_SET_CHANNEL_STREAMID command. It is suspected that many HDMI
sinks need some time to adapt to the new state.

The workaround is to avoid changing stream id/format whenever possible.
Proposed by David.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wu Fengguang 2009-11-18 12:38:06 +08:00 committed by Takashi Iwai
parent 848de598ee
commit 5779191e0e
1 changed files with 26 additions and 2 deletions
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28
sound/pci/hda/patch_intelhdmi.c
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@ -772,6 +772,31 @@ static void intel_hdmi_unsol_event(struct hda_codec *codec, unsigned int res)
* Callbacks
*/
static void hdmi_setup_stream(struct hda_codec *codec, hda_nid_t nid,
u32 stream_tag, int format)
{
int tag;
int fmt;
tag = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0) >> 4;
fmt = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_STREAM_FORMAT, 0);
snd_printdd("hdmi_setup_stream: "
"NID=0x%x, %sstream=0x%x, %sformat=0x%x\n",
nid,
tag == stream_tag ? "" : "new-",
stream_tag,
fmt == format ? "" : "new-",
format);
if (tag != stream_tag)
snd_hda_codec_write(codec, nid, 0,
AC_VERB_SET_CHANNEL_STREAMID, stream_tag << 4);
if (fmt != format)
snd_hda_codec_write(codec, nid, 0,
AC_VERB_SET_STREAM_FORMAT, format);
}
static int intel_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
struct hda_codec *codec,
unsigned int stream_tag,
@ -783,7 +808,7 @@ static int intel_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
hdmi_setup_audio_infoframe(codec, hinfo->nid, substream);
snd_hda_codec_setup_stream(codec, hinfo->nid, stream_tag, 0, format);
hdmi_setup_stream(codec, hinfo->nid, stream_tag, format);
return 0;
}
@ -791,7 +816,6 @@ static int intel_hdmi_playback_pcm_cleanup(struct hda_pcm_stream *hinfo,
struct hda_codec *codec,
struct snd_pcm_substream *substream)
{
snd_hda_codec_cleanup_stream(codec, hinfo->nid);
return 0;
}