During system suspend there is a chance that the running stream undergo an xrun and instead of the expected SNDRV_PCM_TRIGGER_SUSPEND trigger we will receive SNDRV_PCM_TRIGGER_STOP.

The handling of SUSPEND and STOP triggers differ that case of the later the sof_pcm_stream_free() will be called with free_widget_list = false. But we must make sure that all active widgets and streams are free before entering suspend in order to be able to resume without error.

We can utilize the tear_down_all_pipelines to put the system to an expected state and to fix the suspend/resume error.

Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com --- sound/soc/sof/ipc4-topology.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c index ab85dde4303b..c31b7f065c1d 100644 --- a/sound/soc/sof/ipc4-topology.c +++ b/sound/soc/sof/ipc4-topology.c @@ -1813,6 +1813,39 @@ static int sof_ipc4_dai_get_clk(struct snd_sof_dev *sdev, struct snd_sof_dai *da return -EINVAL; }

+static int sof_ipc4_tear_down_all_pipelines(struct snd_sof_dev *sdev, bool verify) +{ + struct snd_sof_pcm *spcm; + int dir, ret; + + /* + * This function is called during system suspend, we need to make sure + * that all streams have been freed up. + * Freeing might have been skipped when xrun happened just at the start + * of the suspend and it sent a SNDRV_PCM_TRIGGER_STOP to the active + * stream. This will call sof_pcm_stream_free() with + * free_widget_list = false which will leave the kernel and firmware out + * of sync during suspend/resume. + * + * This will also make sure that paused streams handled correctly. + */ + list_for_each_entry(spcm, &sdev->pcm_list, list) { + for_each_pcm_streams(dir) { + struct snd_pcm_substream *substream = spcm->stream[dir].substream; + + if (!substream || !substream->runtime) + continue; + + if (spcm->stream[dir].list) { + ret = sof_pcm_stream_free(sdev, substream, spcm, dir, true); + if (ret < 0) + return ret; + } + } + } + return 0; +} + static enum sof_tokens host_token_list[] = { SOF_COMP_TOKENS, SOF_AUDIO_FMT_NUM_TOKENS, @@ -1913,4 +1946,5 @@ const struct sof_ipc_tplg_ops ipc4_tplg_ops = { .dai_config = sof_ipc4_dai_config, .parse_manifest = sof_ipc4_parse_manifest, .dai_get_clk = sof_ipc4_dai_get_clk, + .tear_down_all_pipelines = sof_ipc4_tear_down_all_pipelines, };