On Wed, Oct 28, 2009 at 12:46:21PM +0800, Wu Fengguang wrote:
> - if add a 800ms sleep in intel_hdmi_playback_pcm_prepare(), the
> first-0.5s-samples-lost problem disappears
I managed to locate the HDA command that caused the delay :)
void snd_hda_codec_setup_stream(struct hda_codec *codec, hda_nid_t nid,
u32 stream_tag,
int channel_id, int format)
{
if (!nid)
return;
snd_printdd("hda_codec_setup_stream: "
"NID=0x%x, stream=0x%x, channel=%d, format=0x%x\n",
nid, stream_tag, channel_id, format);
==> snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_CHANNEL_STREAMID,
(stream_tag << 4) | channel_id);
+ msleep(500);
If the msleep() is added before the AC_VERB_SET_CHANNEL_STREAMID line,
problem remains; if added after it, problem disappears.
However it's very unclear how it can be fixed in a more sane way..
Thanks,
Fengguang
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