diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2008-11-17 17:11:14 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2008-11-17 17:26:51 +0000 |
| commit | 2adb9833d1782262c20b21457d645163928cf2a2 (patch) | |
| tree | 3e80484273c24359f53516e7eae82af748659518 /sound | |
| parent | be1b87c70af69acfadb8a27a7a76dfb61de92643 (diff) | |
ASoC: Manage VMID mode for WM8990
A small additional power saving can be achieved for the WM8990 by
maintaining VMID using a 2*250k divider when in standby mode.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/wm8990.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8990.c b/sound/soc/codecs/wm8990.c index 938e1542920..2d7b0096d92 100644 --- a/sound/soc/codecs/wm8990.c +++ b/sound/soc/codecs/wm8990.c @@ -1222,8 +1222,14 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec, switch (level) { case SND_SOC_BIAS_ON: break; + case SND_SOC_BIAS_PREPARE: + /* VMID=2*50k */ + val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) & + ~WM8990_VMID_MODE_MASK; + wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x2); break; + case SND_SOC_BIAS_STANDBY: if (codec->bias_level == SND_SOC_BIAS_OFF) { /* Enable all output discharge bits */ @@ -1278,6 +1284,11 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec, wm8990_write(codec, WM8990_EXT_CTL1, 0xa003); wm8990_write(codec, WM8990_EXT_ACCESS_ENA, 0); } + + /* VMID=2*250k */ + val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) & + ~WM8990_VMID_MODE_MASK; + wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x4); break; case SND_SOC_BIAS_OFF: |