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

[Linus Torvalds]

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?

		Linus
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