linux-kernel - Re: libata/PATA: GPCMD_SET_STREAMING via SG

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Message-ID: <20071114121133.GA5253@section-eight>
Date:	Wed, 14 Nov 2007 13:11:33 +0100
From:	Sebastian Kemper <sebastian_ml@....net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing

On Wed, Nov 14, 2007 at 12:28:59AM +0100, Sebastian Kemper wrote:
> http://svn.mplayerhq.hu/mplayer/trunk/stream/stream_dvd.c?view=markup
> 
> See dvd_set_speed(). The drive I'm using is an Optiarc DVD RW AD-7170A.
> With the "old" ATA driver dvd_set_speed() works, with libata it doesn't.

Hello Alan,

in the meantime I tried the kernels 2.6.23.1 as well as 2.6.24-rc2. Both
show the same behaviour when using libata with AMD/NVIDIA PATA support:
GPCMD_SET_STREAMING via SG_IO doesn't have any effect. With these two
kernels I didn't try the "old" ATA driver - but I assume it would've
worked out (changing your system from ATA to libata and vice versa
turned out to be quite time consuming ;)).

Regards
Sebastian
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