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

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Message-ID: <4AB37492.90407@ru.mvista.com>
Date:	Fri, 18 Sep 2009 15:52:50 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	"Jung-Ik (John) Lee" <jilee@...gle.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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

Hello.

Jung-Ik (John) Lee 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}.

    The patch should be broken in two as it's for 2 different subsystems.

>>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?

    There are PDC20262 and PDC20246. We should ask Bart -- he probably has 
the documatation for them...

> -John

>>Alan

WBR, Sergei

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