linux-kernel - Re: [PATCH 05/20] pata_efar: always program master_data before slave

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Message-ID: <AANLkTimAioh_xu0qoQCndSWDAYJ4bpWv01NZn_bZ9g2a@mail.gmail.com>
Date:	Tue, 8 Feb 2011 14:16:09 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/20] pata_efar: always program master_data before slave_data

On Tue, Feb 8, 2011 at 2:07 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Tue, 08 Feb 2011 13:24:09 +0100
> Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
>
>> >From 8acc9371550ce5f98da56f6888ae4b898096ed2c Mon Sep 17 00:00:00 2001
>> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>> Date: Tue, 8 Feb 2011 12:39:25 +0100
>> Subject: [PATCH 05/20] pata_efar: always program master_data before slave_data
>>
>> We may need to set SITRE before programming slave_data.
>
> Do you have a documentation cite for this or is it random fiddling with a
> driver you can't test ?

It is good to enable SITRE register before programming it and all
Intel controllers
(from which EFAR chipset is derived) are programmed this way (per ata_piix.c).
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