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

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Date:	Tue, 18 May 2010 10:45:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	Andreas Herrmann <andreas.herrmann3@....com>,
	Yuhong Bao <yuhongbao_386@...mail.com>,
	venkatesh.pallipadi@...el.com, markh@...pro.net, dmarkh@....rr.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

> 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.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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