[alsa-devel] [PATCH 21/26] ASoC: SOF: PM: implement prepare/complete callbacks

[Pierre-Louis Bossart]

From: Keyon Jie <yang.jie at linux.intel.com>

Implement the prepare() and complete() callbacks for power management,
initialize s0_suspend flag at prepare(), and reset it at complete().

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/pm.c       | 23 +++++++++++++++++++++++
 sound/soc/sof/sof-priv.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 584241e9734a..99e4e6ffff74 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -439,3 +439,26 @@ int snd_sof_suspend(struct device *dev)
 	return sof_suspend(dev, false);
 }
 EXPORT_SYMBOL(snd_sof_suspend);
+
+int snd_sof_prepare(struct device *dev)
+{
+	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+
+#if defined(CONFIG_ACPI)
+	sdev->s0_suspend = acpi_target_system_state() == ACPI_STATE_S0;
+#else
+	/* will suspend to S3 by default */
+	sdev->s0_suspend = false;
+#endif
+
+	return 0;
+}
+EXPORT_SYMBOL(snd_sof_prepare);
+
+void snd_sof_complete(struct device *dev)
+{
+	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+
+	sdev->s0_suspend = false;
+}
+EXPORT_SYMBOL(snd_sof_complete);
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index c2541d020bde..6408ac88a3e5 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -492,6 +492,8 @@ int snd_sof_runtime_resume(struct device *dev);
 int snd_sof_runtime_idle(struct device *dev);
 int snd_sof_resume(struct device *dev);
 int snd_sof_suspend(struct device *dev);
+int snd_sof_prepare(struct device *dev);
+void snd_sof_complete(struct device *dev);
 int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 			    enum sof_d0_substate d0_substate);
 
-- 
2.20.1