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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-11-18 12:38:06 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-11-18 07:46:19 +0100 |
| commit | 5779191e0efd851fb0d54698c13cb4f5325caca6 (patch) | |
| tree | f7bfcf5a1f8a4930ad148f6c5f076098743ea594 /sound | |
| parent | 848de598eef9603d6f2c174f90fded4e63ac5e23 (diff) | |
| download | blackbird-obmc-linux-5779191e0efd851fb0d54698c13cb4f5325caca6.tar.gz blackbird-obmc-linux-5779191e0efd851fb0d54698c13cb4f5325caca6.zip | |
ALSA: intelhdmi - sticky stream id and format
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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/patch_intelhdmi.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/sound/pci/hda/patch_intelhdmi.c b/sound/pci/hda/patch_intelhdmi.c index abb056fde67a..8a1cf9d7e5ce 100644 --- a/sound/pci/hda/patch_intelhdmi.c +++ b/sound/pci/hda/patch_intelhdmi.c @@ -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; } |
