From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH] pm_ops: add irq enable/disable hooks Date: Tue, 10 Apr 2007 13:36:24 +0200 Message-ID: <20070410113623.GF8239@elf.ucw.cz> References: <1175810054.3489.34.camel@johannes.berg> <200704060217.50560.rjw@sisk.pl> <1175849322.3489.64.camel@johannes.berg> <200704061141.31677.rjw@sisk.pl> <1175852652.3489.67.camel@johannes.berg> <20070406191903.GD2583@elf.ucw.cz> <1175896767.8459.6.camel@johannes.berg> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <1175896767.8459.6.camel@johannes.berg> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.linux-foundation.org Errors-To: linux-pm-bounces@lists.linux-foundation.org To: Johannes Berg Cc: linux-pm List-Id: linux-pm@vger.kernel.org Hi! > > And why do _you_ need it? Unfortunately I do not know what the > > decrementer is...? > = > The decrementer is a sort of timer that counts down and once it > overflows raises an exception in the CPU. Like a timer interrupt, but > not coming from anything external. We need to be able to make sure we > don't get a decrementer exception at some spots. > = > Also, we need to call some platform function things at that point to > prepare the system for suspend, and it needs to be done with interrupts > enabled but after all devices are suspended. Hmm, and can't you simply create sysdev for decrementer and special platform handling? sysdevs should be suspended last... Pavel -- = (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html