Re: [RFC Disable suspend on a specific device] This is a little change in linux power scheme

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > I think this is a rather fundamental issue and it requires some more thought.
> >
> > What platform is your device based on, BTW?

> I'm working on an openmoko freerunner gta02 and do some work on android 
> framework.
> It's a smartphone
> http://wiki.openmoko.org/wiki/Main_Page
> 
> The bluetooth device for example in the Freerunner has a direct I2S connection to
> the WM8753.  Audio from a bluetooth headset is decoded by and sent digitially 
> to the WM8753 which does the digital to analogue conversion and 
> routes it out via the appropriate outputs.
> Analogue problem has the ti-caplyso when the audio is routed for a phone call.

I still believe it should be done in the driver... at least
today. Perhaps driver should just keep i2s/bluetooth powered up when
it is in use.

Perhaps we need new state 'sleep but keep working' for cases like
that; echo mem > state should force machine to drop calls etc. There
should be another value where stuff that is in use keeps being powered
up; I also suspect that that's what android wants to use. 

> Is the correct answer to you question?
 
Yes :-).

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html