linux-kernel - Re: [linux-pm] [patch update 2 fix] PM: Introduce core framework for run-time PM of I/O devices

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Message-ID: <20090621234324.06fda564@infradead.org>
Date:	Sun, 21 Jun 2009 23:43:24 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [linux-pm] [patch update 2 fix] PM: Introduce core framework
 for  run-time PM of I/O devices

On Mon, 22 Jun 2009 15:20:43 +0900
Magnus Damm <magnus.damm@...il.com> wrote:

> On Sat, Jun 20, 2009 at 11:30 PM, Alan
> Stern<stern@...land.harvard.edu> wrote:
> > Some more thoughts...
> >
> > Magnus, you might have some insights here.  It occurred to me that
> > some devices can switch power levels very quickly, and the drivers
> > might therefore want the runtime suspend and resume methods to be
> > called as soon as possible, even in interrupt context.
> 
> I'd like to call pm_request_suspend() from interrupt context. I don't

there are some really strong reasons to at least be able to call the
resume function from an interrupt handler.... shared interrupts are one
of them.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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