linux-kernel - Re: [PATCH 02/20] ata_piix: unify code for programming PIO and MWDMA timings

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Message-ID: <4D624EBD.4080400@ru.mvista.com>
Date:	Mon, 21 Feb 2011 14:38:37 +0300
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Sergei Shtylyov <sshtylyov@...sta.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/20] ata_piix: unify code for programming PIO and MWDMA
 timings

Hello.

On 21-02-2011 0:07, Alan Cox wrote:

>>      PIO mode is setup by different code, and it takes care of the IORDY
>> setting according to the PIO rules (and it gets called). DMA mode setup should
>> just ignore the IORDY setting as in all other sane drivers.

> Well it can't ignore it - but if you mean just keep the bit as is then

    Yes, I mean this.

> that sounds sensible, have to see what the docs say happens if you ever
> set MWDMA without IORDY.

    Don't think they say anything on this matter but I can't imagine that 
IORDY matters for DMA.

WBR, Sergei
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