From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Swetland Subject: Re: [RFD] Automatic suspend Date: Tue, 17 Feb 2009 06:14:34 -0800 Message-ID: <20090217141434.GA12378@bulgaria.corp.google.com> References: <200902160010.16955.rjw@sisk.pl> <20090216225831.GH1370@ucw.cz> <20090216231324.GA15435@srcf.ucam.org> <20090216232259.GK1370@ucw.cz> <20090216232619.GB15678@srcf.ucam.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20090216232619.GB15678@srcf.ucam.org> 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: Matthew Garrett Cc: Nigel Cunningham , Uli Luckas , LKML , Pavel Machek , pm list List-Id: linux-pm@vger.kernel.org [Matthew Garrett ] > On Tue, Feb 17, 2009 at 12:22:59AM +0100, Pavel Machek wrote: > > On Mon 2009-02-16 23:13:24, Matthew Garrett wrote: > > > Meanwhile, on embedded it's becoming a less interesting problem because > > > idle and suspended are often now equivalent states. > > > > Android people tell us otherwise. > > https://lists.linux-foundation.org/pipermail/linux-pm/2009-January/019493.html > says that they're the same on their current platform. Well on the Qualcomm MSM72xx SoCs, yeah they're pretty similar -- we can reasonably enter power collapse (full shutdown of the ARM11 and peripherals) from idle. But this is not (to my knowledge) true of *all* SoCs out there. Also, resuming from this state can take 5-30ms (depending on how distracted the baseband processor is by what's going on on the network). Brian