linux-kernel - Re: [REPOST PATCH] sata_promise: use TF interface for polling NODATA commands

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Date:	Wed, 6 Jun 2007 17:34:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Tejun Heo <htejun@...il.com>, Mikael Pettersson <mikpe@...uu.se>,
	akpm@...ux-foundation.org, david@...eaves.com,
	jean.luc.coulon@...il.com, jgarzik@...ox.com,
	michal.k.k.piotrowski@...il.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REPOST PATCH] sata_promise: use TF interface for polling
 NODATA commands

On Wed, 6 Jun 2007 12:05:11 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> 
> FYI to all -- 
> 
> As a reminder. the Promise hardware programs registers when it receives
> a SET FEATURES - XFER MODE.
> 
> If data transfer is occurring on OTHER ports at the time this is issued,
> then data corruption is guaranteed to occur.  Polling will not fix this
> problem -- all ports need to be inactive, when a SET FEATURES - XFER
> MODE command is issued for any port.

Cool - will whoever makes that work drop me a note as I need to do the
same eventually for a couple of other controllers.
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