Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757696AbXKIWii (ORCPT ); Fri, 9 Nov 2007 17:38:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754193AbXKIWia (ORCPT ); Fri, 9 Nov 2007 17:38:30 -0500 Received: from rv-out-0910.google.com ([209.85.198.184]:23218 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751354AbXKIWi2 (ORCPT ); Fri, 9 Nov 2007 17:38:28 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:date:from:to:cc:subject:message-id:references:mime-version:content-type:content-disposition:content-transfer-encoding:in-reply-to:user-agent; b=Elfe5/DGwWjNtCk5NWTeE0xy48ZhA/H75DW7uQjXYhWgjnYrKpDrttzzrU29J35FKvov6wE7ePrcFm1pyTjxGQnA1ZFZiZVSIZFKSGCJLFkYCFEk/z6PLQ8hMvWZMJQWA5h7V3NtqxOdLiv0SO4tNwJzVVz2Q2RhxC4TBNDLQPE= Date: Sat, 10 Nov 2007 05:38:02 +0700 From: Riki Oktarianto To: =?iso-8859-1?B?VPZy9ms=?= Edwin Cc: Jeff Garzik , Mark Lord , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Alan Cox , linux-ide@vger.kernel.org Subject: Re: [PATCH] Add quirk to set AHCI mode on ICH boards Message-ID: <20071109223802.GA23004@ceren> References: <20071109020235.GA2031@ceren> <20071109023129.GA25581@havoc.gtf.org> <4733D421.7000505@rtr.ca> <20071109034622.GB25581@havoc.gtf.org> <20071109120425.543971bf@the-village.bc.nu> <4734736C.5060003@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4734736C.5060003@gmail.com> User-Agent: Mutt/1.5.14 (2007-02-12) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1799 Lines: 46 On Fri, Nov 09, 2007 at 04:49:16PM +0200, T?r?k Edwin wrote: > There is one problem with force enabling ahci. You'll loose the CDROM on > Dell laptops. > Prior to force-enabling ahci there is one "device" that sees the 2 sata > channels, and the 2 ide channels. > When you force-enable ahci, this device becomes the ahci controller (it > changes the device id), > and the IDE controller will appear as a separate new device (with > another device id), but it is disabled. > > There are registers on the ICH7 that allows you to set enabled/disabled > status, but according to the documentation you should not enable a > device after it has been disabled. In practice I couldn't get the CDROM > to get re-enabled: > * either nothing happend > * spurious irqs were sent that nobody handles, unless I used irq=poll; > but still no cdrom. > > Force-enabling AHCI, and not trying to enable the CDROM works, although > I occasionally got NCQ errors. > > For a (long) discussion see this thread on the powertop mailing list: > http://www.bughost.org/pipermail/power/2007-June/000533.html > http://www.bughost.org/pipermail/power/2007-June/000573.html > > And there is also another slightly different approach: > http://mjg59.livejournal.com/76062.html > > Best regards, > --Edwin > In the MacBook, after enabling ahci the IDE controller also appeared as a separate new device, but it is enabled and handled correctly by piix. I haven't got any problem, even suspend/resume works fine. Lucky us who got the ABAR mapped by the BIOS... -- Riki Oktarianto - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/