[alsa-devel] [PATCH 6/9] ASoC: SOF: audio: Add helper to check if only D0i3 streams are active

[Pierre-Louis Bossart]

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

Add a helper function to check if only D0i3-compatible streams
are active.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/sof-audio.c | 33 +++++++++++++++++++++++++++++++++
 sound/soc/sof/sof-audio.h |  1 +
 2 files changed, 34 insertions(+)

diff --git a/sound/soc/sof/sof-audio.c b/sound/soc/sof/sof-audio.c
index d16571ca129c..75f2ef2bd94b 100644
--- a/sound/soc/sof/sof-audio.c
+++ b/sound/soc/sof/sof-audio.c
@@ -11,6 +11,39 @@
 #include "sof-audio.h"
 #include "ops.h"
 
+/*
+ * helper to determine if there are only D0i3 compatible
+ * streams active
+ */
+bool snd_sof_dsp_only_d0i3_compatible_stream_active(struct snd_sof_dev *sdev)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_sof_pcm *spcm;
+	bool d0i3_compatible_active = false;
+	int dir;
+
+	list_for_each_entry(spcm, &sdev->pcm_list, list) {
+		for (dir = 0; dir <= SNDRV_PCM_STREAM_CAPTURE; dir++) {
+			substream = spcm->stream[dir].substream;
+			if (!substream || !substream->runtime)
+				continue;
+
+			/*
+			 * substream->runtime being not NULL indicates that
+			 * that the stream is open. No need to check the
+			 * stream state.
+			 */
+			if (!spcm->stream[dir].d0i3_compatible)
+				return false;
+
+			d0i3_compatible_active = true;
+		}
+	}
+
+	return d0i3_compatible_active;
+}
+EXPORT_SYMBOL(snd_sof_dsp_only_d0i3_compatible_stream_active);
+
 bool snd_sof_stream_suspend_ignored(struct snd_sof_dev *sdev)
 {
 	struct snd_sof_pcm *spcm;
diff --git a/sound/soc/sof/sof-audio.h b/sound/soc/sof/sof-audio.h
index a2702afbd9a1..eacd10e4da11 100644
--- a/sound/soc/sof/sof-audio.h
+++ b/sound/soc/sof/sof-audio.h
@@ -203,6 +203,7 @@ int snd_sof_ipc_set_get_comp_data(struct snd_sof_control *scontrol,
 int sof_restore_pipelines(struct device *dev);
 int sof_set_hw_params_upon_resume(struct device *dev);
 bool snd_sof_stream_suspend_ignored(struct snd_sof_dev *sdev);
+bool snd_sof_dsp_only_d0i3_compatible_stream_active(struct snd_sof_dev *sdev);
 
 /* Machine driver enumeration */
 int sof_machine_register(struct snd_sof_dev *sdev, void *pdata);
-- 
2.20.1