linux-kernel - Re: PCI PM: Restore standard config registers of all devices early

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Message-Id: <1233634878.16867.50.camel@pasglop>
Date:	Tue, 03 Feb 2009 15:21:18 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Andreas Schwab <schwab@...e.de>, Len Brown <lenb@...nel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: PCI PM: Restore standard config registers of all devices early

On Mon, 2009-02-02 at 20:09 -0800, Linus Torvalds wrote:
> 
> On Tue, 3 Feb 2009, Benjamin Herrenschmidt wrote:
> > 
> > The new code will basically make the core bring back everything to D0 on
> > resume. That's a huge power surge and often not needed at all...
> 
> Well, we could easily do it only if it was D0 _before_ resume.
> 
> But quite frankly, before I worry about "huge power surge" issues, I want 
> to feel like the architecture allows for clueless driver writers, and 
> still giving us reliable suspend/resume.
> 
> Once we have that reliability, and only _then_, do I care at all about 
> power issues. Make it work first, and not result in a dead machine if 
> there is unlucky shared interrupt timings.

Right.

Ben.


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