linux-kernel - Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800

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Message-ID: <20100517164644.GW5888@alberich.amd.com>
Date:	Mon, 17 May 2010 18:46:44 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Yuhong Bao <yuhongbao_386@...mail.com>,
	"venkatesh.pallipadi@...el.com" <venkatesh.pallipadi@...el.com>,
	"markh@...pro.net" <markh@...pro.net>,
	"dmarkh@....rr.com" <dmarkh@....rr.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"alain@...ff.lu" <alain@...ff.lu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800

On Mon, May 17, 2010 at 11:12:59AM -0400, Linus Torvalds wrote:
> 
> 
> On Mon, 17 May 2010, Andreas Herrmann wrote:
> > 
> > FYI. I've tried to trigger the publication of errata information for that
> > chipset. Finally this has happened.
> > 
> > The discussed problem is indeed due to an erratum. See erratum #27 in
> > http://support.amd.com/us/Embedded_TechDocs/46837.pdf
> > 
> > The suggested workaround for this is to disable HPET MSI if LPC
> > devices are used. I doubt that there is a convenient way for Linux to
> > find out whether LPC devices are used. Thus I think the only solution
> > to safely avoid the problem is the currently implemented quirk to
> > disable HPET MSI on this chipset.
> 
> Goodie. It would be good to point this out in the source too. Would you be 
> willing to send in a patch that documents this quirk as a result of that 
> erratum #27, so that we don't lose sight of why we're doing that odd MSI 
> disable?

Done that.
See http://marc.info/?l=linux-kernel&m=127411462230838


Andreas

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