@@ -101,6 +101,8 @@ struct snd_soc_dpcm_runtime {
enum snd_soc_dpcm_state state;
int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
+
+ int be_start; /* refcount protected by card's dpcm_mutex */
};
#define for_each_dpcm_fe(be, stream, _dpcm) \
@@ -1556,7 +1556,7 @@ int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
goto unwind;
}
-
+ be->dpcm[stream].be_start = 0;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
count++;
}
@@ -2051,14 +2051,21 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
- if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
+ if (!be->dpcm[stream].be_start &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
+ be->dpcm[stream].be_start++;
+ if (be->dpcm[stream].be_start != 1)
+ continue;
+
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ be->dpcm[stream].be_start--;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2066,9 +2073,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
continue;
+ be->dpcm[stream].be_start++;
+ if (be->dpcm[stream].be_start != 1)
+ continue;
+
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ be->dpcm[stream].be_start--;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2076,9 +2089,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
+ be->dpcm[stream].be_start++;
+ if (be->dpcm[stream].be_start != 1)
+ continue;
+
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ be->dpcm[stream].be_start--;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2087,12 +2106,18 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
+ be->dpcm[stream].be_start--;
+
+ if (be->dpcm[stream].be_start != 0)
continue;
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
+ be->dpcm[stream].be_start++;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
@@ -2100,12 +2125,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ be->dpcm[stream].be_start--;
+ if (be->dpcm[stream].be_start != 0)
continue;
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ be->dpcm[stream].be_start++;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
break;
@@ -2113,12 +2141,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ be->dpcm[stream].be_start--;
+ if (be->dpcm[stream].be_start != 0)
continue;
ret = soc_pcm_trigger(be_substream, cmd);
- if (ret)
+ if (ret) {
+ be->dpcm[stream].be_start++;
goto end;
+ }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
On start/pause_release/resume, when more than one FE is connected to the same BE, it's possible that the trigger is sent more than once. This is not desirable, we only want to trigger a BE once, which is straightforward to implement with a refcount. For stop/pause/suspend, the problem is more complicated: the check implemented in snd_soc_dpcm_can_be_free_stop() may fail due to a conceptual deadlock when we trigger the BE before the FE. In this case, the FE states have not yet changed, so there are corner cases where the TRIGGER_STOP is never sent - the dual case of start where multiple triggers might be sent. This patch suggests an unconditional trigger in all cases, without checking the FE states, using a refcount protected by a mutex. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> --- include/sound/soc-dpcm.h | 2 ++ sound/soc/soc-pcm.c | 53 +++++++++++++++++++++++++++++++--------- 2 files changed, 44 insertions(+), 11 deletions(-)