From ce37f5ea4b77171952aacd829e8f346b78191a7b Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 20 Mar 2012 11:47:36 +0200 Subject: 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 Acked-by: Mark Brown Acked-by: Jarkko Nikula Signed-off-by: Liam Girdwood --- sound/soc/omap/omap-mcbsp.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'sound') 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, -- cgit v1.2.3-18-g5258