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
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