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 the BE PCM stream lock.
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(-)
diff --git a/include/sound/soc-dpcm.h b/include/sound/soc-dpcm.h index 8ed40b8f3da8..9464c588f71d 100644 --- a/include/sound/soc-dpcm.h +++ b/include/sound/soc-dpcm.h @@ -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 BE stream pcm lock */ };
#define for_each_dpcm_fe(be, stream, _dpcm) \ diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index d115e9409c14..1967980d0f79 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -1600,7 +1600,7 @@ 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++; } @@ -2096,14 +2096,21 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, snd_soc_dpcm_be_lock_irqsave(be, stream, flags); 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)) goto unlock_be;
+ be->dpcm[stream].be_start++; + if (be->dpcm[stream].be_start != 1) + goto unlock_be; + ret = soc_pcm_trigger(be_substream, cmd); - if (ret) + if (ret) { + be->dpcm[stream].be_start--; goto unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; break; @@ -2111,9 +2118,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) goto unlock_be;
+ be->dpcm[stream].be_start++; + if (be->dpcm[stream].be_start != 1) + goto unlock_be; + ret = soc_pcm_trigger(be_substream, cmd); - if (ret) + if (ret) { + be->dpcm[stream].be_start--; goto unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; break; @@ -2121,9 +2134,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) goto unlock_be;
+ be->dpcm[stream].be_start++; + if (be->dpcm[stream].be_start != 1) + goto unlock_be; + ret = soc_pcm_trigger(be_substream, cmd); - if (ret) + if (ret) { + be->dpcm[stream].be_start--; goto unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START; break; @@ -2132,12 +2151,18 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED)) goto unlock_be;
- if (!snd_soc_dpcm_can_be_free_stop_locked(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) goto unlock_be;
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 unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP; break; @@ -2145,12 +2170,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) goto unlock_be;
- if (!snd_soc_dpcm_can_be_free_stop_locked(fe, be, stream)) + be->dpcm[stream].be_start--; + if (be->dpcm[stream].be_start != 0) goto unlock_be;
ret = soc_pcm_trigger(be_substream, cmd); - if (ret) + if (ret) { + be->dpcm[stream].be_start++; goto unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND; break; @@ -2158,12 +2186,15 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) goto unlock_be;
- if (!snd_soc_dpcm_can_be_free_stop_locked(fe, be, stream)) + be->dpcm[stream].be_start--; + if (be->dpcm[stream].be_start != 0) goto unlock_be;
ret = soc_pcm_trigger(be_substream, cmd); - if (ret) + if (ret) { + be->dpcm[stream].be_start++; goto unlock_be; + }
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED; break;