ASoC: SOF: pcm: do not free widgets during suspend trigger

IPC3 and IPC4 have different requirements for the order in which the FE
CPU and BE CPU DAI trigger callbacks must be invoked. With a regular PCM
start/stop, pipeline widgets are set up during hw_params and freed
during hw_free.

But when the system is suspended when a PCM is running,
pipeline widgets are freed during the SUSPEND trigger callback for the
FE CPU DAI. In order to avoid freeing the pipeline widgets before the BE
CPU DAI trigger is executed, the trigger order was modified in previous
contributions in the PCM dai_link_fixup callback to make sure that the BE
CPU DAI trigger stop/suspend is always invoked before the FE CPU DAI
trigger. But this contradicts the firmware requirement for IPC4 w.r.t.
ordering of pipeline triggers.

So, remove the freeing of pipeline widgets during FE CPU DAI suspend
trigger and handle it during system suspend when the
tear_down_all_pipelines() IPC op is invoked. This will be followed up
with a patch to fix the trigger order for IPC4.
Signed-off-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>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230127120031.10709-6-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ipc3-topology.c

@@ -2264,7 +2264,7 @@ static int sof_tear_down_left_over_pipelines(struct snd_sof_dev *sdev)
 		for_each_pcm_streams(dir) {
 			struct snd_pcm_substream *substream = spcm->stream[dir].substream;
 
-			if (!substream || !substream->runtime)
+			if (!substream || !substream->runtime || spcm->stream[dir].suspend_ignored)
 				continue;
 
 			if (spcm->stream[dir].list) {

sound/soc/sof/ipc4-pcm.c

@@ -183,7 +183,6 @@ static int sof_ipc4_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
 	struct sof_ipc4_copier *ipc4_copier;
-	struct snd_soc_dpcm *dpcm;
 
 	if (!dai) {
 		dev_err(component->dev, "%s: No DAI found with name %s\n", __func__,
@@ -205,17 +204,6 @@ static int sof_ipc4_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 	rate->min = ipc4_copier->available_fmt.base_config->audio_fmt.sampling_frequency;
 	rate->max = rate->min;
 
-	/*
-	 * Set trigger order for capture to SND_SOC_DPCM_TRIGGER_PRE. This is required
-	 * to ensure that the BE DAI pipeline gets stopped/suspended before the FE DAI
-	 * pipeline gets triggered and the pipeline widgets are freed.
-	 */
-	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
-		struct snd_soc_pcm_runtime *fe = dpcm->fe;
-
-		fe->dai_link->trigger[SNDRV_PCM_STREAM_CAPTURE] = SND_SOC_DPCM_TRIGGER_PRE;
-	}
-
 	switch (ipc4_copier->dai_type) {
 	case SOF_DAI_INTEL_SSP:
 		ipc4_ssp_dai_config_pcm_params_match(sdev, (char *)rtd->dai_link->name, params);

sound/soc/sof/ipc4-topology.c

@@ -2025,7 +2025,7 @@ static int sof_ipc4_tear_down_all_pipelines(struct snd_sof_dev *sdev, bool verif
 		for_each_pcm_streams(dir) {
 			struct snd_pcm_substream *substream = spcm->stream[dir].substream;
 
-			if (!substream || !substream->runtime)
+			if (!substream || !substream->runtime || spcm->stream[dir].suspend_ignored)
 				continue;
 
 			if (spcm->stream[dir].list) {

sound/soc/sof/pcm.c

@@ -282,7 +282,6 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 	const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm);
 	struct snd_sof_pcm *spcm;
 	bool reset_hw_params = false;
-	bool free_widget_list = false;
 	bool ipc_first = false;
 	int ret = 0;
 
@@ -326,7 +325,6 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 			spcm->stream[substream->stream].suspend_ignored = true;
 			return 0;
 		}
-		free_widget_list = true;
 		fallthrough;
 	case SNDRV_PCM_TRIGGER_STOP:
 		ipc_first = true;
@@ -353,8 +351,7 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 
 	/* free PCM if reset_hw_params is set and the STOP IPC is successful */
 	if (!ret && reset_hw_params)
-		ret = sof_pcm_stream_free(sdev, substream, spcm, substream->stream,
-					  free_widget_list);
+		ret = sof_pcm_stream_free(sdev, substream, spcm, substream->stream, false);
 
 	return ret;
 }