On Tue, 11 Dec 2018 22:23:15 +0100,
Pierre-Louis Bossart wrote:
>
> +#define RUNTIME_PM 1
What's this? This seems used in snd_soc_runtime_suspend() and
_resume(). But it's a just normal boolean flag, no?
> +static void sof_suspend_streams(struct snd_sof_dev *sdev)
> +{
> + struct snd_sof_pcm *spcm;
> + struct snd_pcm_substream *substream;
> + int dir;
> +
> + /* suspend all running streams */
> + list_for_each_entry(spcm, &sdev->pcm_list, list) {
> +
> + mutex_lock(&spcm->mutex);
> +
> + /* suspend running playback stream */
> + dir = SNDRV_PCM_STREAM_PLAYBACK;
> + substream = spcm->stream[dir].substream;
> +
> + if (substream && substream->runtime) {
> +
> + snd_pcm_suspend(substream);
> +
> + /*
> + * set restore_stream so that hw_params can be
> + * restored during resume
> + */
> + spcm->restore_stream[dir] = 1;
> + }
> +
> + /* suspend running capture stream */
> + dir = SNDRV_PCM_STREAM_CAPTURE;
> + substream = spcm->stream[dir].substream;
> +
> + if (substream && substream->runtime) {
> +
> + snd_pcm_suspend(substream);
> +
> + /*
> + * set restore_stream so that hw_params can be
> + * restored during resume
> + */
> + spcm->restore_stream[dir] = 1;
> + }
Both playback and capture do the same thing, so this can be a loop of
dir.
thanks,
Takashi
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