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 <tushar.behera@linaro.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
index 94d0873..76cbb9e 100644 (file)
--- 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;