From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Nvidia cable detection problems (was [PATCH] amd74xx: don't configure udma mode higher than BIOS did) Date: Tue, 06 Feb 2007 03:36:17 +0900 Message-ID: <45C77921.4020808@gmail.com> References: <20070205075836.GG1625@htj.dyndns.org> <20070205112410.5a3c3182@localhost.localdomain> <45C72012.7050605@gmail.com> <20070205132247.6f611e3c@localhost.localdomain> <45C73A3E.6080700@gmail.com> <20070205143439.6962c076@localhost.localdomain> <45C7444F.4070500@gmail.com> <58cb370e0702050709w1b7682dr5dff9e7ce69465a@mail.gmail.com> <20070205181224.3319d6c3@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from nz-out-0506.google.com ([64.233.162.225]:43065 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933021AbXBESgX (ORCPT ); Mon, 5 Feb 2007 13:36:23 -0500 Received: by nz-out-0506.google.com with SMTP id s1so1682025nze for ; Mon, 05 Feb 2007 10:36:23 -0800 (PST) In-Reply-To: <20070205181224.3319d6c3@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cc: Allen Martin , Bartlomiej Zolnierkiewicz , linux-ide@vger.kernel.org, linux-kernel Alan wrote: >> The *real* solution is to use the BIOS ACPI _GTM _STM methods for this. >> Then you can remove all chipset specific knowledge from the IDE driver. >> This is what the MS driver does on Windows, so you know it's received a >> lot of testing from NVIDIA and board vendors. > > Well we can certainly do some of that if ACPI is present and active. In > particular since _GTM will give us current modes allowing for hotplug and > post BIOS boot kexec etc it ought to be safe to do Tejun's hack that way. > We could even probe UDMA3+ capable devices by doing _STM to a high mode > and _GTM to determine the cable type 8) Glad to see the problem getting solved. Now that we know the solution, any volunteers? :-) -- tejun