ASoC: soc-dai: add flag to mute and unmute stream during trigger

In some setups like Speaker amps which are very sensitive, ex: keeping them
unmute without actual data stream for very short duration results in a
static charge and results in pop and clicks. To minimize this, provide a way
to mute and unmute such codecs during trigger callbacks.

Signed-off-by: Srinivas Kandagatla <[e-mail]>
Tested-by: Johan Hovold <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/sound/soc-dai.h

···
 
 	/* bit field */
 	unsigned int no_capture_mute:1;
+	unsigned int mute_unmute_on_trigger:1;
 };
 
 struct snd_soc_cdai_ops {

sound/soc/soc-dai.c

···
 			ret = soc_dai_trigger(dai, substream, cmd);
 			if (ret < 0)
 				break;
+
+			if (dai->driver->ops && dai->driver->ops->mute_unmute_on_trigger)
+				snd_soc_dai_digital_mute(dai, 0, substream->stream);
+
 			soc_dai_mark_push(dai, substream, trigger);
 		}
 		break;
···
 		for_each_rtd_dais(rtd, i, dai) {
 			if (rollback && !soc_dai_mark_match(dai, substream, trigger))
 				continue;
+
+			if (dai->driver->ops && dai->driver->ops->mute_unmute_on_trigger)
+				snd_soc_dai_digital_mute(dai, 1, substream->stream);
 
 			r = soc_dai_trigger(dai, substream, cmd);
 			if (r < 0)

sound/soc/soc-pcm.c

···
 			if (snd_soc_dai_active(dai) == 0)
 				soc_pcm_set_dai_params(dai, NULL);
 
-			if (snd_soc_dai_stream_active(dai, substream->stream) == 0)
-				snd_soc_dai_digital_mute(dai, 1, substream->stream);
+			if (snd_soc_dai_stream_active(dai, substream->stream) ==  0) {
+				if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
+					snd_soc_dai_digital_mute(dai, 1, substream->stream);
+			}
 		}
 	}
 
···
 	snd_soc_dapm_stream_event(rtd, substream->stream,
 			SND_SOC_DAPM_STREAM_START);
 
-	for_each_rtd_dais(rtd, i, dai)
-		snd_soc_dai_digital_mute(dai, 0, substream->stream);
+	for_each_rtd_dais(rtd, i, dai) {
+		if (dai->driver->ops && !dai->driver->ops->mute_unmute_on_trigger)
+			snd_soc_dai_digital_mute(dai, 0, substream->stream);
+	}
 
 out:
 	return soc_pcm_ret(rtd, ret);