[PATCH 2/3] ASoC: SOF: pcm: Make hw_params reset conditional for IPC3

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

From: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

In the case of IPC4, since there is no PCM_PARAMS IPC to send the new
stream tag when restarting a stream without a hw_free, the original
stream tag needs to be preserved. So, add new a flag as part of struct
sof_ipc_pcm_ops, reset_hw_params_during_stop and set it only for IPC3.
This will ensure that the host DMA stream tag will not be given up during
the STOP trigger 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: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/sof/ipc3-pcm.c  | 1 +
 sound/soc/sof/pcm.c       | 3 ++-
 sound/soc/sof/sof-audio.h | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc3-pcm.c b/sound/soc/sof/ipc3-pcm.c
index b29d93e0d216..b7f1eb21ca26 100644
--- a/sound/soc/sof/ipc3-pcm.c
+++ b/sound/soc/sof/ipc3-pcm.c
@@ -382,4 +382,5 @@ const struct sof_ipc_pcm_ops ipc3_pcm_ops = {
 	.hw_free = sof_ipc3_pcm_hw_free,
 	.trigger = sof_ipc3_pcm_trigger,
 	.dai_link_fixup = sof_ipc3_pcm_dai_link_fixup,
+	.reset_hw_params_during_stop = true,
 };
diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c
index 445acb5c3a21..f75b161125fa 100644
--- a/sound/soc/sof/pcm.c
+++ b/sound/soc/sof/pcm.c
@@ -328,7 +328,8 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 		fallthrough;
 	case SNDRV_PCM_TRIGGER_STOP:
 		ipc_first = true;
-		reset_hw_params = true;
+		if (pcm_ops && pcm_ops->reset_hw_params_during_stop)
+			reset_hw_params = true;
 		break;
 	default:
 		dev_err(component->dev, "Unhandled trigger cmd %d\n", cmd);
diff --git a/sound/soc/sof/sof-audio.h b/sound/soc/sof/sof-audio.h
index d220af5f08fb..81685e778ad6 100644
--- a/sound/soc/sof/sof-audio.h
+++ b/sound/soc/sof/sof-audio.h
@@ -104,6 +104,8 @@ struct snd_sof_dai_config_data {
  * @pcm_free: Function pointer for PCM free that can be used for freeing any
  *	       additional memory in the SOF PCM stream structure
  * @delay: Function pointer for pcm delay calculation
+ * @reset_hw_params_during_stop: Flag indicating whether the hw_params should be reset during the
+ *				 STOP pcm trigger
  */
 struct sof_ipc_pcm_ops {
 	int (*hw_params)(struct snd_soc_component *component, struct snd_pcm_substream *substream,
@@ -117,6 +119,7 @@ struct sof_ipc_pcm_ops {
 	void (*pcm_free)(struct snd_sof_dev *sdev, struct snd_sof_pcm *spcm);
 	snd_pcm_sframes_t (*delay)(struct snd_soc_component *component,
 				   struct snd_pcm_substream *substream);
+	bool reset_hw_params_during_stop;
 };
 
 /**
-- 
2.40.0