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ASoC: Don't bring the CODEC up to full power for supplies and biases

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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>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2011-06-04 11:34:43 +01:00
parent 56fba41f8f
commit dfcc9047c9
1 changed files with 21 additions and 2 deletions
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23
sound/soc/soc-dapm.c
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@ -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;