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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2008-03-17 14:36:24 +0100
committerTakashi Iwai <tiwai@suse.de>2008-04-24 12:00:26 +0200
commitf5e09ef0985ff01af6b4a12954840467f153a41c (patch)
tree81e8db50126018fe3fefd4a11d2e166aca48138d /sound/spi
parentb32300a4ce78b4df92f33c455ffe644b36f0ff1a (diff)
downloadlinux-linaro-stable-f5e09ef0985ff01af6b4a12954840467f153a41c.tar.gz
[ALSA] at73c213: Add constraints for periods value
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>
Diffstat (limited to 'sound/spi')
-rw-r--r--sound/spi/at73c213.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/spi/at73c213.c b/sound/spi/at73c213.c
index aa571152f034..09802e8a6fb8 100644
--- a/sound/spi/at73c213.c
+++ b/sound/spi/at73c213.c
@@ -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_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_max = chip->bitrate;
runtime->hw = snd_at73c213_playback_hw;