On 05/19/2014 11:23 AM, Tushar Behera wrote:
Currently snd_dmaengine_pcm_trigger() calls dmaengine_pause() unconditinally during device suspend. In case where DMA controller doesn't support PAUSE/RESUME functionality, this call is not able to stop the DMA controller. In this scenario, audio playback doesn't resume after device resume.
Calling dmaengine_pause/dmaengine_terminate_all conditionally fixes the issue.
It has been tested with audio playback on Samsung platform having PL330 DMA controller which doesn't support PAUSE/RESUME.
Signed-off-by: Tushar Behera tushar.behera@linaro.org
Acked-by: Lars-Peter Clausen lars@metafoo.de
Thanks.
sound/core/pcm_dmaengine.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 94d0873..76cbb9e 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -182,6 +182,7 @@ static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime; int ret;
switch (cmd) {
@@ -196,6 +197,11 @@ int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) dmaengine_resume(prtd->dma_chan); break; case SNDRV_PCM_TRIGGER_SUSPEND:
if (runtime->info & SNDRV_PCM_INFO_PAUSE)dmaengine_pause(prtd->dma_chan);elsedmaengine_terminate_all(prtd->dma_chan);break;