Hi Takashi, Nice catch. I make a change and mail patch v2 for reviewing. thanks, Robert. Takashi Iwai <tiwai@xxxxxxx> 於 2021年7月7日 週三 下午7:38寫道: > > On Tue, 06 Jul 2021 14:44:40 +0200, > Robert Lee wrote: > > > > When compress offload pauses in draining state, not all platforms > > need to keep in draining state. Some platforms may call drain or > > partial drain again when resume from pause in draining, so it needs > > to wake up from snd_compress_wait_for_drain() in this case. > > > > Call API snd_compr_leave_draining_in_pause(), if the platform > > doesn't need to keep in draining state when pause in draining > > state. > > > > Signed-off-by: Robert Lee <lerobert@xxxxxxxxxx> > > Well, the logic is a bit confusing (hard to understand what really > "leave-draining-in-pause" actually means) but also error-prone; > e.g. you left pause_in_draining flag set while changing the state to > SNDRV_PCM_STATE_PAUSED. This will keep the pause_in_draining flag > even after snd_compr_resume() call. > > > thanks, > > Takashi > > > --- > > include/sound/compress_driver.h | 14 ++++++++++++++ > > sound/core/compress_offload.c | 7 ++++++- > > 2 files changed, 20 insertions(+), 1 deletion(-) > > > > diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h > > index 277087f635f3..e16524a93a14 100644 > > --- a/include/sound/compress_driver.h > > +++ b/include/sound/compress_driver.h > > @@ -145,6 +145,7 @@ struct snd_compr_ops { > > * @lock: device lock > > * @device: device id > > * @use_pause_in_draining: allow pause in draining, true when set > > + * @leave_draining_in_pause: leave draining state when pausing in draining > > */ > > struct snd_compr { > > const char *name; > > @@ -156,6 +157,7 @@ struct snd_compr { > > struct mutex lock; > > int device; > > bool use_pause_in_draining; > > + bool leave_draining_in_pause; > > #ifdef CONFIG_SND_VERBOSE_PROCFS > > /* private: */ > > char id[64]; > > @@ -182,6 +184,18 @@ static inline void snd_compr_use_pause_in_draining(struct snd_compr_stream *subs > > substream->device->use_pause_in_draining = true; > > } > > > > +/** > > + * snd_compr_leave_draining_in_pause - Leave draining state when pause in draining > > + * @substream: compress substream to set > > + * > > + * In some platform, we need to leave draining state when we use pause in draining. > > + * Add API to allow leave draining state. > > + */ > > +static inline void snd_compr_leave_draining_in_pause(struct snd_compr_stream *substream) > > +{ > > + substream->device->leave_draining_in_pause = true; > > +} > > + > > /* dsp driver callback apis > > * For playback: driver should call snd_compress_fragment_elapsed() to let the > > * framework know that a fragment has been consumed from the ring buffer > > diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c > > index 21ce4c056a92..9c7bd4db6ecd 100644 > > --- a/sound/core/compress_offload.c > > +++ b/sound/core/compress_offload.c > > @@ -719,8 +719,13 @@ static int snd_compr_pause(struct snd_compr_stream *stream) > > if (!stream->device->use_pause_in_draining) > > return -EPERM; > > retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); > > - if (!retval) > > + if (!retval) { > > stream->pause_in_draining = true; > > + if (stream->device->leave_draining_in_pause) { > > + stream->runtime->state = SNDRV_PCM_STATE_PAUSED; > > + wake_up(&stream->runtime->sleep); > > + } > > + } > > break; > > default: > > return -EPERM; > > -- > > 2.32.0.93.g670b81a890-goog > >