When we don't have any active audio we can put the microphone biases into bypass mode to save power at the expense of performance.

Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/codecs/wm8994.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 files changed, 39 insertions(+), 1 deletions(-)

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c index 2cb2518..51fefb8 100644 --- a/sound/soc/codecs/wm8994.c +++ b/sound/soc/codecs/wm8994.c @@ -1980,6 +1980,18 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec, break;

case SND_SOC_BIAS_PREPARE: + /* MICBIAS into regulating mode */ + switch (control->type) { + case WM8958: + case WM1811: + snd_soc_update_bits(codec, WM8958_MICBIAS1, + WM8958_MICB1_MODE, 0); + snd_soc_update_bits(codec, WM8958_MICBIAS2, + WM8958_MICB2_MODE, 0); + break; + default: + break; + } break;

case SND_SOC_BIAS_STANDBY: @@ -2032,7 +2044,20 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec, WM8994_LINEOUT2_DISCH); }

- + /* MICBIAS into bypass mode on newer devices */ + switch (control->type) { + case WM8958: + case WM1811: + snd_soc_update_bits(codec, WM8958_MICBIAS1, + WM8958_MICB1_MODE, + WM8958_MICB1_MODE); + snd_soc_update_bits(codec, WM8958_MICBIAS2, + WM8958_MICB2_MODE, + WM8958_MICB2_MODE); + break; + default: + break; + } break;

case SND_SOC_BIAS_OFF: @@ -3354,6 +3379,19 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec) break; }

+ /* Put MICBIAS into bypass mode by default on newer devices */ + switch (control->type) { + case WM8958: + case WM1811: + snd_soc_update_bits(codec, WM8958_MICBIAS1, + WM8958_MICB1_MODE, WM8958_MICB1_MODE); + snd_soc_update_bits(codec, WM8958_MICBIAS2, + WM8958_MICB2_MODE, WM8958_MICB2_MODE); + break; + default: + break; + } + wm8994_update_class_w(codec);

wm8994_handle_pdata(wm8994);