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: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8996.c b/sound/soc/codecs/wm8996.c
index 1fd6354..8af422e 100644
--- a/sound/soc/codecs/wm8996.c
+++ b/sound/soc/codecs/wm8996.c
@@ -1770,7 +1770,13 @@
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 @@
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: