[PATCH 1/2] ASoC: SOF: Intel: hda: Do not stop/start DMA during pause/release

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

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

The FW does not pause/stop the host DMA during pause and stopping the
host DMA from the driver could result in an unknown behaviour. So, skip
triggering the HD-Audio host DMA during pause/release.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/sof/intel/hda-stream.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/intel/hda-stream.c b/sound/soc/sof/intel/hda-stream.c
index 79d818e6a0fa..8de422604ad5 100644
--- a/sound/soc/sof/intel/hda-stream.c
+++ b/sound/soc/sof/intel/hda-stream.c
@@ -337,7 +337,13 @@ int hda_dsp_stream_trigger(struct snd_sof_dev *sdev,
 	/* cmd must be for audio stream */
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (!sdev->dspless_mode_selected)
+			break;
+		fallthrough;
 	case SNDRV_PCM_TRIGGER_START:
+		if (hstream->running)
+			break;
+
 		snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, SOF_HDA_INTCTL,
 					1 << hstream->index,
 					1 << hstream->index);
@@ -360,8 +366,11 @@ int hda_dsp_stream_trigger(struct snd_sof_dev *sdev,
 			hstream->running = true;
 
 		break;
-	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (!sdev->dspless_mode_selected)
+			break;
+		fallthrough;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 		snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
 					sd_offset,
-- 
2.40.0