From: Kristoffer Ericson <kristoffer.ericson@gmail.com>
To: "eric miao" <eric.y.miao@gmail.com>
Cc: "Kristoffer Ericson" <kristoffer.ericson@gmail.com>,
"Russell King" <linux@arm.linux.org.uk>,
Linux-arm <linux-arm-kernel@lists.arm.linux.org.uk>,
linux-main <linux-kernel@vger.kernel.org>
Subject: Re: PDA Suspend SA1100
Date: Sat, 20 Oct 2007 14:38:07 -0700 [thread overview]
Message-ID: <20071020143807.c9677e47.Kristoffer.Ericson@Gmail.com> (raw)
In-Reply-To: <f17812d70710181756n67c92f31p7f37eaed88f33aea@mail.gmail.com>
On Fri, 19 Oct 2007 08:56:18 +0800
"eric miao" <eric.y.miao@gmail.com> wrote:
> On 10/19/07, Kristoffer Ericson <kristoffer.ericson@gmail.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,
Ah, good to know.
>
> 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
I'll start running through the different drivers to see if I can spot anything obvious.
>
> 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/
> >
--
Kristoffer Ericson <Kristoffer.Ericson@Gmail.com>
prev parent reply other threads:[~2007-10-20 12:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-19 8:37 Kristoffer Ericson
2007-10-19 0:56 ` eric miao
2007-10-20 21:38 ` Kristoffer Ericson [this message]
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