ASoC: DaVinci: pcm, constrain buffer size to multiple of period

The dma setup code assumes that the buffer size is a multiple
of the period size.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
index 8fd0c3cdc710..ab43a539c11d 100644
--- a/sound/soc/davinci/davinci-pcm.c
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -244,6 +244,11 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
         int ret = 0;
 
         snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
+        /* ensure that buffer size is a multiple of period size */
+        ret = snd_pcm_hw_constraint_integer(runtime,
+                                                SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                return ret;
 
         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
         if (prtd == NULL)