linux-kernel - Re: [PATCH] pata_it8213: MWDMA0 is unsupported

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Message-ID: <4B1827EA.4050608@garzik.org>
Date:	Thu, 03 Dec 2009 16:04:42 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_it8213: MWDMA0 is unsupported

On 11/26/2009 12:23 PM, Sergei Shtylyov wrote:
> Bartlomiej Zolnierkiewicz wrote:
>
>>> MWDMA0 timings cannot be met with the PIIX based controller
>>> programming interface.
>
>>> This change should be safe as this is how we have been doing
>>> things in IDE it8213 host driver for years.
>
>>> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>>> ---
>>> Verified with the documentation (similar case as with pata_efar).
>
>> Uhhh, no...
>
>> Too many damn drivers.
>
>> Too much damn duplication.
>
>> Too much damn subtle differences here and there.
>
>> The hardware is probably fine for MWMDA0 when it comes to
>> pata_{efar,it8213},
>> it just not documented properly in the data sheet.
>
> How so with pata_efar? The active/recovery bitfields are still 2-bit
> wide, no?

So....  pata_it8213 is fine for MWDMA0, then?

	Jeff




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