Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764207AbXJSA42 (ORCPT ); Thu, 18 Oct 2007 20:56:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756665AbXJSA4U (ORCPT ); Thu, 18 Oct 2007 20:56:20 -0400 Received: from wa-out-1112.google.com ([209.85.146.176]:15580 "EHLO wa-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758560AbXJSA4T (ORCPT ); Thu, 18 Oct 2007 20:56:19 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=rBR0M9WJ1P1m5RJCvE9SsSfCNlS6Dlga8I+/0w2JBxqjYxInxJmrQBKguXSfeB6S2Z4gkrGBUBtdlS4e0/wTiKaE8ljoHnWDSBpaM/YmH7KnpfyYqj15MOeVjwgSM5V6Ayf2AdrwrVxUi93IOgW8OKjJoNS2RmAgw00ndkDIUpY= Message-ID: Date: Fri, 19 Oct 2007 08:56:18 +0800 From: "eric miao" To: "Kristoffer Ericson" Subject: Re: PDA Suspend SA1100 Cc: "Russell King" , Linux-arm , linux-main In-Reply-To: <20071019013736.11dec046.Kristoffer.ericson@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20071019013736.11dec046.Kristoffer.ericson@gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1793 Lines: 42 On 10/19/07, Kristoffer Ericson wrote: > Greetings, > > I've been trying to implement proper suspend on my jornada 720 machine. But as far as I can see it never reaches > the sa11x0_suspend code. > > I've linked power button event to produce APM_SUSPEND and I can see that it says "Stopping TASKS ======". It then > blanks screen but keeps LCD powerd. I know it goes into resume again since removing backlight code in resume function > effectivly turns off the LCD. > > Im assuming that it tries to suspend but fails at some point and tries to return into normal operations? > Exactly what is needed to get the suspend procedure happy? Does every driver need to have suspend/resume code? I don't think so. Unless a driver feels it necessary to take some action, no suspend/resume will not cause the whole system to fail. However, 1) if any driver suspend code returns error, the whole procedure will stop 2) and instable wake-up source (like glitch on wake-up GPIO pin) or incorrect setting (like wake up from RTC but set the interval to be 0) will also cause the immediate resume check "sa11x0_suspend" print out won't work since the console has already been suspended, try DISABLE_CONSOLE_SUSPEND or other ways - eric > > Best wishes > Kristoffer Ericson > - > 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/ > - 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/