linux-kernel - Re: [RFD] Automatic suspend

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Date:	Sun, 15 Feb 2009 19:30:37 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Mon, 16 Feb 2009 14:23:41 +1100
Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Sun, 2009-02-15 at 18:20 -0800, Arjan van de Ven wrote:
> > what this needs is a separation between "interface down, all off"
> > and "interface down enough so that link detection works".
> > Some NICs can go all the way down and still do link detection,
> > others cannot. This is obviously something the driver will know,
> > nothing else in the system should know.
> 
> Sure, my point was just that the driver cannot make the decision to go
> all-off (and thus not detect link) without some kind of user setting
> allowing it to do so.

to a very large degree, "want linkdetection" is a form of keeping the
device open.. even if the current code doesn't quite work that way
(maybe it should)



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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