linux-kernel - Re: UNS: Re: [PATCH] PCI: do not delay when changing power states on Geode

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Message-Id: <20070708114443.4f2ee65e.dilinger@queued.net>
Date:	Sun, 8 Jul 2007 11:44:43 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jordan Crouse <jordan.crouse@....com>,
	info-linux@...de.amd.com, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz, tsylla@...il.com
Subject: Re: UNS: Re: [PATCH] PCI: do not delay when changing power states
 on Geode

On Fri, 6 Jul 2007 11:05:18 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> On Thu, 5 Jul 2007 22:13:51 -0400
> Andres Salomon <dilinger@...ued.net> 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@...ued.net>
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