linux-kernel - Re: something strange in libata-core.c for kernel 2.6.22-rc3

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Date:	Sun, 20 May 2007 19:31:54 +0200
From:	Tejun Heo <htejun@...il.com>
To:	l.genoni@...relinux.com
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: something strange in libata-core.c for kernel 2.6.22-rc3

l.genoni@...relinux.com wrote:
> 
> Mybe I am wrong, but if you are detecting 40-wire cable to set them to
> DMA/33, why the check includes also 80-wire cables configuring them to
> DMA/33 too?
> 
> With this patch my nvidia4 IDE controllers detects correctly and
> configure correctly DMA/100 for my HD and DMA/33 for my DVD (the first
> uses a 80-wire cable, the second a 40-wire cable).
> 
> Am I wrong somewhere?

That's the drive side verification of 80c cable check, so if the
condition triggers we downgrade 80c or unknown to 40c.  Cable detection
on nvidia PATA is a disaster.  You're supposed to do some ACPI dancing
and drive side detection is completely bogus.  Eeeek....

Alan, did you have a chance to test the ACPI cable detection?  It just
didn't work when I tried it.  It always returned 80c on my machine.

-- 
tejun
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