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

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Message-ID: <4B182486.6050505@garzik.org>
Date:	Thu, 03 Dec 2009 15:50:14 -0500
From:	Jeff Garzik <jeff@...zik.org>
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

On 11/26/2009 10:15 AM, Alan Cox wrote:
> On Thu, 26 Nov 2009 15:53:58 +0100
> Bartlomiej Zolnierkiewicz<bzolnier@...il.com>  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.

ACK Bart's patch, then?

This thread was a bit unclear, and I want to be certain (well, as 
certain as we can be :))

	Jeff



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