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 --- 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 938e154..2d7b009 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: