Hi,

Let me illustrate the system first.

FE1 -----+----> BE

|

FE2 -----+

When there is multi-FE stream to a single BE, the BE will receive SND_SOC_DAPM_STREAM_STOP if one of the FE shutdown.

However, the BE is stilled used by another, this will let BE cpu_dai and codec_dai think they are inactive. The later power check will go wrong.

I have check the latest linux version, and didn't find any related change.

The following is my change to address this, and will re-send a formal patch if it's ok.

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 70e8088..9c2d159 100644

--- a/sound/soc/soc-pcm.c

+++ b/sound/soc/soc-pcm.c

@@ -163,6 +163,13 @@ int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,

dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",

be->dai_link->name, event, dir);

+ /* don't sent stop event if this BE is used by other FE */

+ if (event == SND_SOC_DAPM_STREAM_STOP &&

+ be->dpcm[dir].users >= 1) {

+ pr_warn("kc, %s(), be->dai_link->name %s skip stop event\n",

__func__, be->dai_link->name);

+ continue;

+ }

+

snd_soc_dapm_stream_event(be, dir, event);

}

Sincerely,

Kai Chieh