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

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Date:	Thu, 28 Jan 2010 08:25:23 -0500
From:	Mark Hounschell <markh@...pro.net>
To:	Andreas Herrmann <andreas.herrmann3@....com>
CC:	dmarkh@....rr.com, Yuhong Bao <yuhongbao_386@...mail.com>,
	venkatesh.pallipadi@...el.com, andi@...stfloor.org,
	Linus Torvalds <torvalds@...ux-foundation.org>, alain@...ff.lu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800

On 01/28/2010 04:17 AM, Mark Hounschell wrote:
> On 01/25/2010 12:10 PM, Andreas Herrmann wrote:
>> On Fri, Jan 22, 2010 at 11:21:06PM -0800, Yuhong Bao wrote:
>>>
>>>> HPET MSI on platforms with ATI SB700/SB800 as they seem to have some
>>>> side-effects on floppy DMA. Do not use HPET MSI on such platforms.
>>
>> Argh, will see what information I can find about this problem ...
>>
>>> I think somebody from AMD should review the situation.Clearly
>>   something is happening inside their southbridge.CCing Andreas
>>   Herrmann from AMD.
>>
>> I have the feeling that this problem should rather be fixed with a DMI
>> quirk instead of disabling HPET MSI for the entire chipset.
>>
>> Was the latest available BIOS installed on the affected system?
>>
> 
> You mean "systems" of different manufactures?  I will check today. Due to
> mis configured filters I didn't see this until today. Sorry.
> 
> Mark
> 

My BIOS were below rev on all my affected boards but updating did not help
with the problem.

Andreas, while I have your ear, I am also having another issue with this
chip set doing peer to peer bus transfers between pci buses and pci-e buses
and from pci-e to pci-e buses. I've read the chip set specs and they _seem_
to imply that it may not be allowed due to "Trusted Computing" something or
another. I've posed the issue to the AMD forums with no luck, and
I can't figure out why this doesn't work using these chip sets.

Sorry to change the subject. I just figured I'd ask someone from AMD while
I had the chance.

Thanks and Regards
Mark
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