[alsa-devel] [PATCH 2/4] ASoC: SOF: PM: add check before setting d0_substate

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 --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)