ALSA: ASoC: Use codec digital mute when stopping playback

Muting the DAC masks artefacts introduced as the digital stream shuts
down, for example when the input stops being clocked.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 1563ceedf61a..ad381138fc2e 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -340,6 +340,12 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
         }
         codec->active--;
 
+        /* Muting the DAC suppresses artifacts caused during digital
+         * shutdown, for example from stopping clocks.
+         */
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                snd_soc_dai_digital_mute(codec_dai, 1);
+
         if (cpu_dai->ops.shutdown)
                 cpu_dai->ops.shutdown(substream);