[alsa-devel] [PATCH for 2.6.40] ASoC: Fix power down for widgetless per-card DAPM context case

[Mark Brown]

On Thu, May 26, 2011 at 04:32:18PM +0300, Jarkko Nikula wrote:
> Commit 52ba67b ("ASoC: Force all DAPM contexts into the same bias state")
> powers up all the DAPM contexts in a card if any DAPM context becomes
> active. Unfortunately power down newer happens if per-card DAPM context
> doesn't have any widgets.
> 
> Reason for this is that power state of per-card DAPM context without
> widgets is never cleared and thus all the DAPM contexts remain permanently
> active. Test for widgetless calling DAPM context in dapm_power_widgets()
> doesn't work for per-card DAPM context since power change is never
> originating from widgetless per-card DAPM context.

Applied, thanks, though this is a bit of a band aid as we're currently
still allowing widgetless CODECs.