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[ALSA] at73c213: Add constraints for periods value

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The interrupt handler always provide runtime->period_size data, so it
works correctly only if buffer_size was a multiple of period_size.

This patch fixes periodic click noise.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Atsushi Nemoto 2008-03-17 14:36:24 +01:00 • committed by Takashi Iwai
parent b32300a4ce
commit f5e09ef098
1 changed files with 6 additions and 0 deletions
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6
sound/spi/at73c213.c
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@ -210,7 +210,13 @@ static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
{ {
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_runtime *runtime = substream->runtime;
int err;
/* ensure buffer_size is a multiple of period_size */
err = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
snd_at73c213_playback_hw.rate_min = chip->bitrate; snd_at73c213_playback_hw.rate_min = chip->bitrate;
snd_at73c213_playback_hw.rate_max = chip->bitrate; snd_at73c213_playback_hw.rate_max = chip->bitrate;
runtime->hw = snd_at73c213_playback_hw; runtime->hw = snd_at73c213_playback_hw;