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Date: Mon, 13 Aug 2007 11:11:35 -0500
From: Scott Wood <scottwood@freescale.com>
To: Yoni Levin <yonil@slydetech.com>
Subject: Re: Power Managment (mpc83xx)
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On Mon, Aug 13, 2007 at 02:44:50PM +0300, Yoni Levin wrote:
> I have mpc83xx, and I work with Linux 2.6
> 
> I am trying to use power management states. 
> 
> I succeed to get into D1 state (echo standby > /sys/power/state),

That's actually closer to D3hot than D1.  It uses sleep mode, but does
not power down the core.

> And to waked up by GPIO.
> 
> But when I try tried echo mem > /sys/power/state it waked up by reset
> (that stuck in the middle)

You need u-boot support to resume from deep sleep on 831x.  See the code
in the mpc8313erdb board files.

> Or echo disk > /sys/power/state didn't went to sleep at all.

There's no support for suspend-to-disk in my patchset.

-Scott