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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2012-03-20 11:47:36 +0200
committerLiam Girdwood <lrg@ti.com>2012-05-22 17:33:19 +0100
commitce37f5ea4b77171952aacd829e8f346b78191a7b (patch)
tree22416384fa6bb13354d02d6df9b75f767f32ef51 /sound
parent35d210faa17e46897771fcf0d78df7f952b0f9b0 (diff)
downloadlinux-ce37f5ea4b77171952aacd829e8f346b78191a7b.tar.gz
ASoC: omap-mcbsp: buffer size constraint only applies to playback stream
In capture stream the buffer size does not need to be constrained to be bigger then the McBSP FIFO. In capture the FIFO content is taken out in period length burst, this enusres that the FIFO is not going to overflow. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com> Signed-off-by: Liam Girdwood <lrg@ti.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/omap/omap-mcbsp.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 27144a67e5e..1046083e90a 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -138,13 +138,15 @@ static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
if (mcbsp->pdata->buffer_size) {
/*
* Rule for the buffer size. We should not allow
- * smaller buffer than the FIFO size to avoid underruns
+ * smaller buffer than the FIFO size to avoid underruns.
+ * This applies only for the playback stream.
*/
- snd_pcm_hw_rule_add(substream->runtime, 0,
- SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
- omap_mcbsp_hwrule_min_buffersize,
- mcbsp,
- SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+ omap_mcbsp_hwrule_min_buffersize,
+ mcbsp,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
/* Make sure, that the period size is always even */
snd_pcm_hw_constraint_step(substream->runtime, 0,