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

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Message-ID: <AANLkTilaO0yzg1IzdrnND6kvw539Kpz6Alaa30QMj8pc@mail.gmail.com>
Date:	Tue, 18 May 2010 17:22:38 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andreas Herrmann <andreas.herrmann3@....com>,
	Yuhong Bao <yuhongbao_386@...mail.com>,
	venkatesh.pallipadi@...el.com, markh@...pro.net, dmarkh@....rr.com,
	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 Tue, May 18, 2010 at 2:45 AM, Andi Kleen <andi@...stfloor.org> wrote:
>> If one wanted, you could disable HPET MSI on this chipset only when a
>> driver requests an ISA DMA channel. Then if there's no floppy or other LPC
>> DMA device present, it can stay enabled. I don't know if it's worth the
>> trouble, though.
>
> There can be LPC devices which are not visible to the kernel,
> but only used through ACPI or the BIOS. Think of fancy fan
> controllers and similar.

I would hope they wouldn't use DMA without kernel knowledge, otherwise
that really would be an abomination..
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