If the only widgets active within a CODEC are supplies and micbiases we are not passing audio, we are probably just doing microphone detection. This will not generally require either fully accurate reference voltages or much power so
If this turns out to be unsuitable for some systems we can provide a facility to override this decision.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/soc/soc-dapm.c | 23 +++++++++++++++++++++-- 1 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 0bbded4..6be6546 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1147,8 +1147,27 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event) power = w->power_check(w); else power = 1; - if (power) - w->dapm->target_bias_level = SND_SOC_BIAS_ON; + + if (power) { + d = w->dapm; + + /* Supplies and micbiases only bring + * the context up to STANDBY as unless + * something else is active and + * passing audio they generally don't + * require full power. + */ + switch (w->id) { + case snd_soc_dapm_supply: + case snd_soc_dapm_micbias: + if (d->target_bias_level < SND_SOC_BIAS_STANDBY) + d->target_bias_level = SND_SOC_BIAS_STANDBY; + break; + default: + d->target_bias_level = SND_SOC_BIAS_ON; + break; + } + }
if (w->power == power) continue;