From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754631Ab0EQQq4 (ORCPT ); Mon, 17 May 2010 12:46:56 -0400 Received: from tx2ehsobe002.messaging.microsoft.com ([65.55.88.12]:27083 "EHLO TX2EHSOBE004.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754244Ab0EQQqy convert rfc822-to-8bit (ORCPT ); Mon, 17 May 2010 12:46:54 -0400 X-SpamScore: -12 X-BigFish: VPS-12(zz1432P98dN1b0bMzz1202hzz5eeeP3198r327alz32i2a8h43h62h) X-Spam-TCS-SCL: 1:0 X-WSS-ID: 0L2KP9Z-02-JS4-02 X-M-MSG: Date: Mon, 17 May 2010 18:46:44 +0200 From: Andreas Herrmann To: Linus Torvalds CC: Yuhong Bao , "venkatesh.pallipadi@intel.com" , "markh@compro.net" , "dmarkh@cfl.rr.com" , "andi@firstfloor.org" , "alain@knaff.lu" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800 Message-ID: <20100517164644.GW5888@alberich.amd.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Content-Transfer-Encoding: 8BIT X-Reverse-DNS: unknown Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 17, 2010 at 11:12:59AM -0400, Linus Torvalds wrote: > > > 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? Done that. See http://marc.info/?l=linux-kernel&m=127411462230838 Andreas -- Operating | Advanced Micro Devices GmbH System | Einsteinring 24, 85609 Dornach b. München, Germany Research | Geschäftsführer: Andrew Bowd, Thomas M. McCoy, Giuliano Meroni Center | Sitz: Dornach, Gemeinde Aschheim, Landkreis München (OSRC) | Registergericht München, HRB Nr. 43632