Re: UNS: Re: [PATCH] PCI: do not delay when changing power stateson Geode

[Andres Salomon]

On Fri, 6 Jul 2007 11:05:18 +0100
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:

> On Thu, 5 Jul 2007 22:13:51 -0400
> Andres Salomon <dilinger@xxxxxxxxxx> wrote:
> 
> > Geode hardware requires no delay when doing power transition for PCI;
> > the board doesn't even have a real PCI bus.  Thanks to Tom Sylla for
> > pointing this out.  We can save precious milliseconds when changing power
> > states to D3hot by getting rid of this delay.
> > 
> > We do this as a PCI quirk.
> 
> NAK
> 
> These systems may have other components on them which require the proper
> transition times and the CS5530 supports external real PCI devices.
> 
> Alan

You're right; I munged the description.  Turns out the patch is wrong
anyways, though (whether the delay is necessary or not turns out to be
firmware dependent).


-- 
Andres Salomon <dilinger@xxxxxxxxxx>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/