ASoC: SOF: PM: add check before setting d0_substate
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>
Link: https://lore.kernel.org/r/20191111223343.19986-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 3204c92..b89810b 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -416,6 +416,9 @@
{
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)
