The bias-bias-voltage should powered up/down automatically.
Added missing DAPM_PRE and DAPM_POST widgets to fire up the mic_bias_event function.
--- sound/soc/codecs/sgtl5000.c
+++ sound/soc/codecs/sgtl5000.c
@@ -260,6 +260,9 @@ static const struct snd_soc_dapm_widget
SND_SOC_DAPM_PRE("VAG_POWER_PRE", power_vag_event),
SND_SOC_DAPM_POST("VAG_POWER_POST", power_vag_event),
+
+ SND_SOC_DAPM_PRE("MIC_BIAS_PRE", mic_bias_event),
+ SND_SOC_DAPM_POST("MIC_BIAS_POST", mic_bias_event),
};
/* routes for sgtl5000 */
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