linux-kernel - Re: PDA Suspend SA1100

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Date:	Sat, 20 Oct 2007 14:38:07 -0700
From:	Kristoffer Ericson <kristoffer.ericson@...il.com>
To:	"eric miao" <eric.y.miao@...il.com>
Cc:	"Kristoffer Ericson" <kristoffer.ericson@...il.com>,
	"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 Fri, 19 Oct 2007 08:56:18 +0800
"eric miao" <eric.y.miao@...il.com> wrote:

> 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,
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
> > -
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> >


-- 
Kristoffer Ericson <Kristoffer.Ericson@...il.com>
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