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Message-ID: <f17812d70710181756n67c92f31p7f37eaed88f33aea@mail.gmail.com> Date: Fri, 19 Oct 2007 08:56:18 +0800 From: "eric miao" <eric.y.miao@...il.com> To: "Kristoffer Ericson" <kristoffer.ericson@...il.com> Cc: "Russell King" <linux@....linux.org.uk>, Linux-arm <linux-arm-kernel@...ts.arm.linux.org.uk>, linux-main <linux-kernel@...r.kernel.org> Subject: Re: PDA Suspend SA1100 On 10/19/07, Kristoffer Ericson <kristoffer.ericson@...il.com> 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@...r.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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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