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ALSA: hda - Avoid BDL position workaround when no_period_wakeup is set 

Originally the bogus period at BDL head was introduced as a workaround
for the mismatching position update at the period boundary, typically
seen on dmix.  However, for applications like PulseAudio that don't
require period wake ups, this workaround is just superfluous.  Thus
better to disable it when no_period_wakeup is given in hw_params.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-09-11 15:19:10 +02:00
parent 5fe8e1e671
commit 915bf29eb9
1 changed files with 7 additions and 5 deletions
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12
sound/pci/hda/hda_intel.c
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@ -415,6 +415,7 @@ struct azx_dev {
*/
unsigned int insufficient :1;
unsigned int wc_marked:1;
unsigned int no_period_wakeup:1;
};
/* CORB/RIRB */
@ -1419,7 +1420,7 @@ static int azx_setup_periods(struct azx *chip,
ofs = 0;
azx_dev->frags = 0;
pos_adj = bdl_pos_adj[chip->dev_index];
if (pos_adj > 0) {
if (!azx_dev->no_period_wakeup && pos_adj > 0) {
struct snd_pcm_runtime *runtime = substream->runtime;
int pos_align = pos_adj;
pos_adj = (pos_adj * runtime->rate + 47999) / 48000;
@ -1435,8 +1436,7 @@ static int azx_setup_periods(struct azx *chip,
pos_adj = 0;
} else {
ofs = setup_bdle(chip, substream, azx_dev,
&bdl, ofs, pos_adj,
!substream->runtime->no_period_wakeup);
&bdl, ofs, pos_adj, true);
if (ofs < 0)
goto error;
}
@ -1449,7 +1449,7 @@ static int azx_setup_periods(struct azx *chip,
else
ofs = setup_bdle(chip, substream, azx_dev, &bdl, ofs,
period_bytes,
!substream->runtime->no_period_wakeup);
!azx_dev->no_period_wakeup);
if (ofs < 0)
goto error;
}
@ -1922,10 +1922,12 @@ static int azx_pcm_prepare(struct snd_pcm_substream *substream)
if (bufsize != azx_dev->bufsize ||
period_bytes != azx_dev->period_bytes ||
format_val != azx_dev->format_val) {
format_val != azx_dev->format_val ||
runtime->no_period_wakeup != azx_dev->no_period_wakeup) {
azx_dev->bufsize = bufsize;
azx_dev->period_bytes = period_bytes;
azx_dev->format_val = format_val;
azx_dev->no_period_wakeup = runtime->no_period_wakeup;
err = azx_setup_periods(chip, substream, azx_dev);
if (err < 0)
return err;