[alsa-devel] [PATCH] ASoC: dapm: check suspend state in dapm_dai_check_power()

[Mark Brown]

On Mon, Jun 03, 2013 at 11:36:40AM -0600, Stephen Warren wrote:
> From: Stephen Warren <swarren at nvidia.com>
> 
> Currently, when the system enters suspend with audio playing, since the
> DAI widgets are active, the associated CODEC is considered active, and
> hence is not transition into a low-power bias state as the system
> suspends. This likely causes audio failure after resume, since the CODEC
> power has quite possibly been removed during suspend, and the bias level
> transitions in the CODEC driver are needed to recover from this. At the
> very least, this issue likely causes warnings in the kernel log due to
> the CODEC being left on over the suspend transition.
> 
> To solve this, modify dapm_dai_check_power() not to consider DAI widgets
> active if the system is entering suspend.

I would expect us to be dealing with this as part of quiescing the DMA
operations on the links - it's not just the CODEC that needs handling
here.  This feels like it ought to be more joined up somewhere along the
line.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: Digital signature
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20130603/27f5d692/attachment.sig>