linux-kernel - Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported

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Message-Id: <200911261553.58941.bzolnier@gmail.com>
Date:	Thu, 26 Nov 2009 15:53:58 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported

On Wednesday 25 November 2009 06:25:52 pm Alan Cox wrote:
> On Wed, 25 Nov 2009 18:04:15 +0100
> Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
> 
> > From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > Subject: [PATCH] pata_efar: MWDMA0 is unsupported
> > 
> > MWDMA0 timings cannot be met with the PIIX based controller
> > programming interface.
> 
> The efar documentation makes no reference to not being capable of MWDMA0,
> so where does this come from ? No MWDMA0 is an Intel erratum it appears.

No MWDMA0 support is a common issue on all 'PIIX-like' controllers.

In case of this chipset while the (preliminary) documentation claims MWDMA0
support on the 'FEATURES' page the later 'programming guide' part describes
only PIO0-4, SWDMA2, MWDMA1-2 and UDMA0-4 transfer modes as supported.

--
Bartlomiej Zolnierkiewicz
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