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Commit 501bf035 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: wm8996: Put the microphone biases into bypass mode when idle 



When we're not actively doing audio we don't need the microphone biases
to be regulated, noise is not important when we are not looking at the
audio signal. Save some power by putting the MICBIAS regulators into
bypass mode when not doing audio.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent be3f3f2c

sound/soc/codecs/wm8996.c

+12 −0
Original line number Diff line number Diff line
@@ -1770,7 +1770,13 @@ static int wm8996_set_bias_level(struct snd_soc_codec *codec, 


	switch (level) {

	case SND_SOC_BIAS_ON:

		break;

	case SND_SOC_BIAS_PREPARE:

		/* Put the MICBIASes into regulating mode */

		snd_soc_update_bits(codec, WM8996_MICBIAS_1,

				    WM8996_MICB1_MODE, 0);

		snd_soc_update_bits(codec, WM8996_MICBIAS_2,

				    WM8996_MICB2_MODE, 0);

		break;



	case SND_SOC_BIAS_STANDBY:
@@ -1793,6 +1799,12 @@ static int wm8996_set_bias_level(struct snd_soc_codec *codec, 
			regcache_cache_only(codec->control_data, false);

			regcache_sync(codec->control_data);

		}



		/* Bypass the MICBIASes for lowest power */

		snd_soc_update_bits(codec, WM8996_MICBIAS_1,

				    WM8996_MICB1_MODE, WM8996_MICB1_MODE);

		snd_soc_update_bits(codec, WM8996_MICBIAS_2,

				    WM8996_MICB2_MODE, WM8996_MICB2_MODE);

		break;



	case SND_SOC_BIAS_OFF: