From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756951Ab0ERIp5 (ORCPT ); Tue, 18 May 2010 04:45:57 -0400 Received: from one.firstfloor.org ([213.235.205.2]:54391 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752654Ab0ERIp4 (ORCPT ); Tue, 18 May 2010 04:45:56 -0400 Date: Tue, 18 May 2010 10:45:51 +0200 From: Andi Kleen To: Robert Hancock Cc: Andreas Herrmann , Yuhong Bao , venkatesh.pallipadi@intel.com, markh@compro.net, dmarkh@cfl.rr.com, andi@firstfloor.org, Linus Torvalds , alain@knaff.lu, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800 Message-ID: <20100518084551.GA22675@basil.fritz.box> References: <4B32565E.6000501@compro.net> <20091223191806.GA3336@linux-os.sc.intel.com> <4B3270FE.5090607@compro.net> <1261600243.16916.56.camel@localhost.localdomain> <4B476E8D.1030308@compro.net> <20100121190952.GA32523@linux-os.sc.intel.com> <20100125171059.GB5041@alberich.amd.com> <20100517145943.GV5888@alberich.amd.com> <4BF1E5BE.9010000@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4BF1E5BE.9010000@gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > 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@linux.intel.com -- Speaking for myself only.