Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757308AbZFVPdV (ORCPT ); Mon, 22 Jun 2009 11:33:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752319AbZFVPdM (ORCPT ); Mon, 22 Jun 2009 11:33:12 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:58743 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750731AbZFVPdM (ORCPT ); Mon, 22 Jun 2009 11:33:12 -0400 From: "Rafael J. Wysocki" To: Arjan van de Ven Subject: Re: [linux-pm] [patch update 2 fix] PM: Introduce core framework for run-time PM of I/O devices Date: Mon, 22 Jun 2009 17:33:42 +0200 User-Agent: KMail/1.11.2 (Linux/2.6.30-rjw; KDE/4.2.4; x86_64; ; ) Cc: Magnus Damm , Alan Stern , Greg KH , LKML , ACPI Devel Maling List , "Linux-pm mailing list" , Ingo Molnar References: <20090621234324.06fda564@infradead.org> In-Reply-To: <20090621234324.06fda564@infradead.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200906221733.44629.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1301 Lines: 33 On Monday 22 June 2009, Arjan van de Ven wrote: > On Mon, 22 Jun 2009 15:20:43 +0900 > Magnus Damm wrote: > > > On Sat, Jun 20, 2009 at 11:30 PM, Alan > > Stern 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. Yes. But that requires your hardware to be able to wake up fast enough, so I think we can introduce pm_runtime_resume_atomic() and pm_runtime_suspend_atomic() to be used with the devices that can do that, as proposed by Alan. Surely not all devices can do it, though. Best, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/