[alsa-devel] [PATCH 2/5] ASoC: twl6040: Prevent extra power transitions during resume

[Peter Ujfalusi]

From: Misael Lopez Cruz <misael.lopez at ti.com>

Prevent unnecessary power state transitions that might occur while
CODEC is resuming if already in target state.

Signed-off-by: Misael Lopez Cruz <misael.lopez at ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
 sound/soc/codecs/twl6040.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c
index ef31ace..b40830c 100644
--- a/sound/soc/codecs/twl6040.c
+++ b/sound/soc/codecs/twl6040.c
@@ -1114,8 +1114,10 @@ static int twl6040_suspend(struct snd_soc_codec *codec)
 
 static int twl6040_resume(struct snd_soc_codec *codec)
 {
-	twl6040_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-	twl6040_set_bias_level(codec, codec->dapm.suspend_bias_level);
+	if (codec->dapm.bias_level != codec->dapm.suspend_bias_level) {
+		twl6040_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+		twl6040_set_bias_level(codec, codec->dapm.suspend_bias_level);
+	}
 
 	return 0;
 }
-- 
1.8.1