[PATCH 1/3 Raring SRU] ALSA: hda - Add power state filtering

[Seth Forshee]

On Sun, Aug 04, 2013 at 03:59:27AM -0600, Tim Gardner wrote:
> From: Takashi Iwai <tiwai at suse.de>
> 
> BugLink: http://bugs.launchpad.net/bugs/1183125
> 
> Add a hook to struct hda_codec for filtering the target power state of
> each widget when powering up/down.  The current hackish EAPD check is
> implemented as the default hook pointer, too.
> 
> This allows codec drivers to implement own power filter.  In the
> upcoming changes, the generic parser will have the better power filter
> based on the active paths.
> 
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> (cherry picked from commit 9419ab6b72325e20789a61004cf68dc9e909a009)
> 
> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>

This patch looks like it should have no functional change, and I don't
think either of the subsequent patches depend on it. It looks safe
enough, but it does contain a fair amount of churn. Are you sure this
one is needed?

Seth