Power Managment (mpc83xx)

Scott Wood scottwood at freescale.com
Tue Aug 14 02:11:35 EST 2007

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.


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