ASoC: tlv320aix31xx: Cleanup manual bias level transitions

Set the CODEC driver's suspend_bias_off flag rather than manually going to
SND_SOC_BIAS_OFF in suspend and SND_SOC_BIAS_STANDBY in resume. This makes
the code a bit shorter and cleaner.

Since the ASoC core now takes care of setting the bias level to
SND_SOC_BIAS_OFF when removing the CODEC there is no need to do it manually
anymore either.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tlv320aic31xx.c

@@ -1056,18 +1056,6 @@ static int aic31xx_set_bias_level(struct snd_soc_codec *codec,
 	return 0;
 }
 
-static int aic31xx_suspend(struct snd_soc_codec *codec)
-{
-	aic31xx_set_bias_level(codec, SND_SOC_BIAS_OFF);
-	return 0;
-}
-
-static int aic31xx_resume(struct snd_soc_codec *codec)
-{
-	aic31xx_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-	return 0;
-}
-
 static int aic31xx_codec_probe(struct snd_soc_codec *codec)
 {
 	int ret = 0;
@@ -1110,8 +1098,6 @@ static int aic31xx_codec_remove(struct snd_soc_codec *codec)
 {
 	struct aic31xx_priv *aic31xx = snd_soc_codec_get_drvdata(codec);
 	int i;
-	/* power down chip */
-	aic31xx_set_bias_level(codec, SND_SOC_BIAS_OFF);
 
 	for (i = 0; i < ARRAY_SIZE(aic31xx->supplies); i++)
 		regulator_unregister_notifier(aic31xx->supplies[i].consumer,
@@ -1123,9 +1109,9 @@ static int aic31xx_codec_remove(struct snd_soc_codec *codec)
 static struct snd_soc_codec_driver soc_codec_driver_aic31xx = {
 	.probe			= aic31xx_codec_probe,
 	.remove			= aic31xx_codec_remove,
-	.suspend		= aic31xx_suspend,
-	.resume			= aic31xx_resume,
 	.set_bias_level		= aic31xx_set_bias_level,
+	.suspend_bias_off	= true,
+
 	.controls		= aic31xx_snd_controls,
 	.num_controls		= ARRAY_SIZE(aic31xx_snd_controls),
 	.dapm_widgets		= aic31xx_dapm_widgets,