From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@redhat.com>
Subject: Re: [PATCH] libata-scsi: automatically use DMADIR if drive/bridge requires it
Date: Mon, 18 Feb 2008 17:20:44 -0500
Message-ID: <20080218222044.GA20041@devserv.devel.redhat.com>
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To: Mark Lord <liml@rtr.ca>
Cc: Albert Lee <albertcc@tw.ibm.com>, IDE/ATA development list <linux-ide@vger.kernel.org>, Jeff Garzik <jgarzik@pobox.com>, Alan Cox <alan@redhat.com>, Tejun Heo <htejun@gmail.com>

On Mon, Feb 18, 2008 at 03:53:46PM -0500, Mark Lord wrote:
> +		/* some SATA bridges need us to indicate data xfer direction 
> */
> +		if (atapi_dmadir || (dev->id[62] & 0x8000))

The rest of the code uses ata_ inlines/defines in ata.h for things like this
and religiously checks validity bits and ATA versions.