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

From: Andreas Herrmann
Date: Mon May 17 2010 - 12:47:00 EST

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
> >
> >
> > 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.


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