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[2/4] ASoC: SOF: PM: add check before setting d0_substate

Message ID 20191111223343.19986-3-pierre-louis.bossart@linux.intel.com (mailing list archive)
State Accepted
Commit 58a972efd21bb5adadd97f2546693ec64bfc99b9
Headers show
Series ASoC: SOF: Intel: only use D0i3 if needed | expand

Commit Message

Pierre-Louis Bossart Nov. 11, 2019, 10:33 p.m. UTC 
From: Keyon Jie <yang.jie@linux.intel.com>

Add check before seeting d0_substate and return success if Audio DSP is
already in the target substate.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/pm.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 3204c92f0e7d..b89810bf3230 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -416,6 +416,9 @@  int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 {
 	int ret;
 
+	if (sdev->d0_substate == d0_substate)
+		return 0;
+
 	/* do platform specific set_state */
 	ret = snd_sof_dsp_set_power_state(sdev, d0_substate);
 	if (ret < 0)