linux-kernel - Re: [PATCH 7/10 v6] PM / Domains: Don't stop wakeup devices during system sleep transitions

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Date:	Fri, 1 Jul 2011 22:06:42 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kevin Hilman <khilman@...com>,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Walmsley <paul@...an.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 7/10 v6] PM / Domains: Don't stop wakeup devices during system sleep transitions

On Friday, July 01, 2011, Alan Stern wrote:
> On Fri, 1 Jul 2011, Rafael J. Wysocki wrote:
> 
> > So the only way forward I can see is to add a special PM domain callback,
> > say .active_wakeup(), that will return "true" if the device is to be left
> > active if wakeup-enabled.  So the check you don't like will become
> > something like:
> > 
> > if (device_may_wakeup(dev) && genpd->active_wakeup
> >     && genpd->active_wakeup(dev))
> >         return 0;
> > 
> > Would that be better?
> 
> Another option, less flexible but perhaps easier to use, would be to 
> set a couple of bitflags indicating whether the device needs power or 
> clocks to handle wakeup signals.

Well, I agree, but I've decided to add the new callback after all.

Thanks,
Rafael
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