Messages in this thread | | | Date | Wed, 5 May 2010 20:52:50 +0100 | From | Mark Brown <> | Subject | Re: [PATCH 0/8] Suspend block api (version 6) |
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On Wed, May 05, 2010 at 08:22:08PM +0100, Matthew Garrett wrote: > On Wed, May 05, 2010 at 03:13:52PM -0400, Alan Stern wrote:
> > Does it know when a call is in progress?
> Perhaps you could infer that from the audio routing setup? I don't know > enough about embedded codecs.
Yes, you can providing we extract a bit more information from the machine drivers and/or userspace - we already do our power management based on paths. The implementation I'd do here is to provide a facility for marking some of the path endpoints as suspend insensitive then on suspend leave those endpoints in their current state, force the other endpoints off temporarily and re-run the standard power checks.
One thing I'll need to have a bit of a think about is if we need to provide the ability to offer control to userspace for the suspend state of path endpoints separately to their runtime state; I suspect the answer is yes.
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