linux-kernel - Re: [PATCH] libata:ide: Fix udma timings of pdc202xx

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Message-ID: <8b5805ff0909171654i515c832bm570db9bd5936b11a@mail.gmail.com>
Date:	Thu, 17 Sep 2009 16:54:09 -0700
From:	"Jung-Ik (John) Lee" <jilee@...gle.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	sshtylyov@...mvista.com,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata:ide: Fix udma timings of pdc202xx_old controllers

On Thu, Sep 17, 2009 at 4:23 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Thu, 17 Sep 2009 16:02:31 -0700
> "Jung-Ik (John) Lee" <jilee@...gle.com> wrote:
>
>> From: John(Jung-Ik) Lee <jilee@...gle.com>
>>
>> Fix udma timings of pdc202xx_old controllers.
>> MB=1, MC=1 (0x20, 0x01) for all UDMA modes of pdc2026{57}.
>
> On what documentation is this based ?

I have two documents, 20265, and 20267, and both need to set to the
same single value for all UDMA modes.

Doc 1:
  PDC20265 Bus Mastering Ultra DMA PCI –ATA/ATAPI Controller
Specification Rev 2.0
  #7.17.2, Ultra DMA Data Transfer Speed list
    For all Ultra DMA mode, MB, MC = 01h, 01h

Doc 2:
  PDC20267 Bus Mastering Ultra DMA PCI –ATA/ATAPI Controller
Specification Rev 2.0
  #7.17.2, Ultra DMA Data Transfer Speed list
    For all Ultra DMA mode, MB, MC = 01h, 01h

Are there other pdc202xx old controllers that are different?

-John

>
> Alan
>
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