Commit 85a843c5 authored Sep 21, 2011 by Mark Brown

ASoC: Don't force bias on ground referenced devices

Currently we force all devices in the system to be at the same bias level.
This is due to concerns about power or pop/click impacts from either
ramping VMID or mismatching VMID on the analogue I/O lines between
connected devices but does mean we power devices up more often than we
really need to.

If a device flags idle_bias_off this will usually mean that it's either
all digital or ground referenced (in which case the idle and powered bias
levels are identical) so this concern does not apply and we can save some
power by leaving it off when not needed itself.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

parent 8c756158

sound/soc/soc-dapm.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -1319,12 +1319,15 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
		}
		}

		/* Force all contexts in the card to the same bias state */
		/* Force all contexts in the card to the same bias state if
		* they're not ground referenced.
		*/
		bias = SND_SOC_BIAS_OFF;
		list_for_each_entry(d, &card->dapm_list, list)
		if (d->target_bias_level > bias)
		bias = d->target_bias_level;
		list_for_each_entry(d, &card->dapm_list, list)
		if (!d->idle_bias_off)
		d->target_bias_level = bias;

		trace_snd_soc_dapm_walk_done(card);

Admin message