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

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Message-ID: <20071113232859.GA4681@section-eight>
Date:	Wed, 14 Nov 2007 00:28:59 +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

Hi Alan!

On Tue, Nov 13, 2007 at 09:22:30PM +0000, Alan Cox wrote:
> It isn't a known issue, and it suprises me as SG_IO basically passes
> commands through to the drive. We don't support speed change via xfermode
> setting but GPCMD_SET_STREAMING sohuld behave.
> 
> Do you have a simple code example that shows the problem ?

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.

Regards
Sebastian
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