From 02fb05a598e9393382f55132a36aff84f4d76ad5 Mon Sep 17 00:00:00 2001 From: Tushar Behera Date: Mon, 19 May 2014 14:53:53 +0530 Subject: [PATCH] ALSA: pcm_dmaengine: Add check during device suspend 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 Acked-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai --- 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 94d08733cb38..76cbb9ec953a 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); + else + dmaengine_terminate_all(prtd->dma_chan); + break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: dmaengine_pause(prtd->dma_chan); break;