linux-kernel - Re: 2.6.29-rc libata sff 32bit PIO regression

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Message-ID: <20090121225808.1f5ffac1@lxorguk.ukuu.org.uk>
Date:	Wed, 21 Jan 2009 22:58:08 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	Hugh Dickins <hugh@...itas.com>,
	Jeff Garzik <jgarzik@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29-rc libata sff 32bit PIO regression

On Thu, 22 Jan 2009 01:51:17 +0300
Sergei Shtylyov <sshtylyov@...mvista.com> wrote:

> Hello.
> 
> Alan Cox wrote:
> 
> >> Hugh Dickins writes:
> >>  > I've a Dell Precision 670 here (four-year-old EM64T Xeon with ata_piix)
> >>  > which doesn't like your commit 871af1210f13966ab911ed2166e4ab2ce775b99d
> >>  > libata: Add 32bit PIO support.  Full dmesg (and .config) attached, but
> >>  > here's an extract showing the start of the error messages on ata2:
> >>     
> >
> > Cool - so we need two different 32bit PIO methods - at least according to
> > the docs for the AMD we should use entirely 32bit I/O there. Fun fun
> >   
> 
>    Could you refer me to the exact AMD doc that requires that?

AMD762 page 82, under DevB:1x40 bit 14 and bit 12

"Note: only 32-bit writes to the data port are allowed when this bit is
set."

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