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

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Message-ID: <473B219E.5060508@rtr.ca>
Date:	Wed, 14 Nov 2007 11:26:06 -0500
From:	Mark Lord <liml@....ca>
To:	Sebastian Kemper <sebastian_ml@....net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing

Sebastian Kemper wrote:
> 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
..

That code is riddled with bugs, by the way.
It fails to close/clean-up on just about every exit path.
But apart from that, it does appear to issue the command.

Another way to the same thing is with "hdparm -E",
which contrary to my earlier posting actually does
seem to work already with libata.

> 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.
..

Can you define "doesn't work" for me?
How can I test this to see if it works one way or another ?

The command issue (ioctl) is not returning -1.

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