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

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Message-ID: <4B0E9FB9.8050508@ru.mvista.com>
Date:	Thu, 26 Nov 2009 18:33:13 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported

Hello.

Alan Cox wrote:

>>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.

> Cool - I only have the original docs.

    Hm, me too... perhaps worth putting in Jeff's documentation archive?

MBR, Sergei
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