From dfcc9047c97ca99b151e30133c9bccf5ab258ca6 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Sat, 4 Jun 2011 11:34:43 +0100 Subject: ASoC: Don't bring the CODEC up to full power for supplies and biases 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 Acked-by: Liam Girdwood --- sound/soc/soc-dapm.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 0bbded43e21..6be6546648c 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; -- cgit v1.2.3-70-g09d2