ASoC: Clean up WM8731 bias level configuration

The WM8731 bias level configuration function was written slightly
obscurely - streamline the code a little and refresh the comments.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 816e5bf9edc1..c6db67793777 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -396,21 +396,19 @@ static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
                                  enum snd_soc_bias_level level)
 {
-        u16 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
+        u16 reg;
 
         switch (level) {
         case SND_SOC_BIAS_ON:
-                /* vref/mid, osc on, dac unmute */
-                wm8731_write(codec, WM8731_PWR, reg);
                 break;
         case SND_SOC_BIAS_PREPARE:
                 break;
         case SND_SOC_BIAS_STANDBY:
-                /* everything off except vref/vmid, */
+                /* Clear PWROFF, gate CLKOUT, everything else as-is */
+                reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
                 wm8731_write(codec, WM8731_PWR, reg | 0x0040);
                 break;
         case SND_SOC_BIAS_OFF:
-                /* everything off, dac mute, inactive */
                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
                 wm8731_write(codec, WM8731_PWR, 0xffff);
                 break;