From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Bartlomiej Zolnierkiewicz" <bzolnier@gmail.com>
Subject: Re: Nvidia cable detection problems (was [PATCH] amd74xx: don't configure udma mode higher than BIOS did)
Date: Mon, 5 Feb 2007 19:55:44 +0100
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To: Tejun Heo <htejun@gmail.com>
Cc: Alan <alan@lxorguk.ukuu.org.uk>, Allen Martin <AMartin@nvidia.com>, linux-ide@vger.kernel.org, linux-kernel <linux-kernel@vger.kernel.org>

Hi,

On 2/5/07, Tejun Heo <htejun@gmail.com> wrote:
> 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.

Allen, thanks for quick reply.

Your mail explained the issue pretty well and saved us a lot of time.

> > 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)

agreed

> Glad to see the problem getting solved.  Now that we know the solution,
> any volunteers?  :-)

Well, since you posted the initial patches and have the affected hardware... 8)

Thanks,
Bart