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 --- sound/soc/omap/omap-mcbsp.c | 14 ++++++++------ 1 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index 27144a6..1046083 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,