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

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Message-ID: <4B183671.80004@ru.mvista.com>
Date:	Fri, 04 Dec 2009 01:06:41 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_it8213: MWDMA0 is unsupported

Hello.

Jeff Garzik 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?

   No, TTBOMK. I just have no datasheet. However, it's programmed 
overclocked and even in theory the cycle time cannot exceeed 600 ns vs 
480 ns spec'ed.

>     Jeff

MBR, Sergei


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