From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] pata_it8213: MWDMA0 is unsupported
Date: Fri, 04 Dec 2009 01:06:41 +0300 [thread overview]
Message-ID: <4B183671.80004@ru.mvista.com> (raw)
In-Reply-To: <4B1827EA.4050608@garzik.org>
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@gmail.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
prev parent reply other threads:[~2009-12-03 22:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-26 16:28 [PATCH] pata_it8213: MWDMA0 is unsupported Bartlomiej Zolnierkiewicz
2009-11-26 17:00 ` Bartlomiej Zolnierkiewicz
2009-11-26 17:23 ` Sergei Shtylyov
2009-11-26 18:00 ` Bartlomiej Zolnierkiewicz
2009-11-26 18:03 ` Bartlomiej Zolnierkiewicz
2009-11-26 18:12 ` Sergei Shtylyov
2009-11-26 18:27 ` Bartlomiej Zolnierkiewicz
2009-11-26 18:33 ` Sergei Shtylyov
2009-11-26 18:47 ` Sergei Shtylyov
2009-12-03 21:04 ` Jeff Garzik
2009-12-03 22:06 ` Sergei Shtylyov [this message]
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