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ASoC: soc-pcm: improve BE transition for PAUSE_RELEASE

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Commit 3aa1e96a2b ("ASoC: soc-pcm: fix BE handling of PAUSE_RELEASE")
did not modify the existing logic and kept the same logic for the following
transition

    play FE1    -> BE state is START
    pause FE1   -> BE state is PAUSED
    play FE2    -> BE state is START
    stop FE2    -> BE state is STOP <<< !!
    release FE1 -> BE state is START
    stop FE1    -> BE state is STOP

At the time it was identified by reviewers that a better solution
might consist in

    play FE1    -> BE state is START
    pause FE1   -> BE state is PAUSED
    play FE2    -> BE state is START
    stop FE2    -> BE state is PAUSE <<< !!
    release FE1 -> BE state is START
    stop FE1    -> BE state is STOP

This patch suggest a transition to PAUSE when all the 'active' streams
are paused. This would allow for a more consistent resource management
for platforms where PAUSE and STOP are handled differently.

To track the special case of an FE going from PAUSE_PUSH to STOP, we
add a state variable for each FE context. This 'fe_pause' boolean is
set on PAUSE_PUSH and cleared on either PAUSE_RELEASE and STOP
triggers.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220406190056.233481-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2022-04-06 14:00:55 -05:00 committed by Mark Brown
parent e65f2fce08
commit 9995c1d096
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 30 additions and 3 deletions
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2
include/sound/soc-dpcm.h
View File

@ -103,6 +103,8 @@ struct snd_soc_dpcm_runtime {
int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
int be_start; /* refcount protected by BE stream pcm lock */
int be_pause; /* refcount protected by BE stream pcm lock */
bool fe_pause; /* used to track STOP after PAUSE */
};
#define for_each_dpcm_fe(be, stream, _dpcm) \

29
sound/soc/soc-pcm.c
View File

@ -2090,6 +2090,7 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
int cmd)
{
struct snd_soc_pcm_runtime *be;
bool pause_stop_transition;
struct snd_soc_dpcm *dpcm;
unsigned long flags;
int ret = 0;
@ -2148,10 +2149,12 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (!be->dpcm[stream].be_start &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
goto next;
fe->dpcm[stream].fe_pause = false;
be->dpcm[stream].be_pause--;
be->dpcm[stream].be_start++;
if (be->dpcm[stream].be_start != 1)
goto next;
@ -2175,14 +2178,33 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].be_start != 0)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
pause_stop_transition = false;
if (fe->dpcm[stream].fe_pause) {
pause_stop_transition = true;
fe->dpcm[stream].fe_pause = false;
be->dpcm[stream].be_pause--;
}
if (be->dpcm[stream].be_pause != 0)
ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
else
ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
if (ret) {
if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
be->dpcm[stream].be_start++;
if (pause_stop_transition) {
fe->dpcm[stream].fe_pause = true;
be->dpcm[stream].be_pause++;
}
goto next;
}
if (be->dpcm[stream].be_pause != 0)
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
else
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
@ -2204,6 +2226,9 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
goto next;
fe->dpcm[stream].fe_pause = true;
be->dpcm[stream].be_pause++;
be->dpcm[stream].be_start--;
if (be->dpcm[stream].be_start != 0)
goto next;