Signed-off-by: Jarkko Nikula jarkko.nikula@nokia.com --- sound/soc/omap/omap-mcbsp.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index d6882be..9c09b94 100644 --- a/sound/soc/omap/omap-mcbsp.c +++ b/sound/soc/omap/omap-mcbsp.c @@ -146,6 +146,17 @@ static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream, struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data); int err = 0;
+ if (cpu_is_omap343x() && mcbsp_data->bus_id == 1) { + /* + * McBSP2 in OMAP3 has 1024 * 32-bit internal audio buffer. + * Set constraint for minimum buffer size to the same than FIFO + * size in order to avoid underruns in playback startup because + * HW is keeping the DMA request active until FIFO is filled. + */ + snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 4096, UINT_MAX); + } + if (!cpu_dai->active) err = omap_mcbsp_request(mcbsp_data->bus_id);