[PATCH 5/5] ASoC: SOF: Intel: hda-dsp: Set streaming flag for d0i3

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

From: Rander Wang <rander.wang@intel.com>

Enable d0i3 streaming if all the active streams can
work in d0i3 state and playback is enabled.

Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@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-dsp.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index e34fe0c9bcde..68eb06f13a1f 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -405,6 +405,34 @@ static int hda_dsp_update_d0i3c_register(struct snd_sof_dev *sdev, u8 value)
 	return 0;
 }
 
+/*
+ * d0i3 streaming is enabled if all the active streams can
+ * work in d0i3 state and playback is enabled
+ */
+static bool hda_dsp_d0i3_streaming_applicable(struct snd_sof_dev *sdev)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_sof_pcm *spcm;
+	bool playback_active = false;
+	int dir;
+
+	list_for_each_entry(spcm, &sdev->pcm_list, list) {
+		for_each_pcm_streams(dir) {
+			substream = spcm->stream[dir].substream;
+			if (!substream || !substream->runtime)
+				continue;
+
+			if (!spcm->stream[dir].d0i3_compatible)
+				return false;
+
+			if (dir == SNDRV_PCM_STREAM_PLAYBACK)
+				playback_active = true;
+		}
+	}
+
+	return playback_active;
+}
+
 static int hda_dsp_set_D0_state(struct snd_sof_dev *sdev,
 				const struct sof_dsp_power_state *target_state)
 {
@@ -446,6 +474,9 @@ static int hda_dsp_set_D0_state(struct snd_sof_dev *sdev,
 		    !hda_enable_trace_D0I3_S0 ||
 		    sdev->system_suspend_target != SOF_SUSPEND_NONE)
 			flags = HDA_PM_NO_DMA_TRACE;
+
+		if (hda_dsp_d0i3_streaming_applicable(sdev))
+			flags |= HDA_PM_PG_STREAMING;
 	} else {
 		/* prevent power gating in D0I0 */
 		flags = HDA_PM_PPG;
-- 
2.39.1