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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