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From: Mark Lord <liml@rtr.ca>
To: Sebastian Kemper <sebastian_ml@gmx.net>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing
Date: Wed, 14 Nov 2007 10:09:22 -0500	[thread overview]
Message-ID: <473B0FA2.5000102@rtr.ca> (raw)
In-Reply-To: <20071113232859.GA4681@section-eight>

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
> 
> 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.
..

I think the problem here might be that libata doesn't actually support SG_IO
for ATAPI drives prior to 2.6.24 (ugh).

Try it with a 2.6.24-rc* kernel from kernel.org, or back-patch the ATA_16
SG_IO support into your older kernel.

Cheers

  parent reply	other threads:[~2007-11-14 15:09 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-13 16:43 Sebastian Kemper
2007-11-13 21:22 ` Alan Cox
2007-11-13 23:28   ` Sebastian Kemper
2007-11-14 12:11     ` Sebastian Kemper
2007-11-14 15:09     ` Mark Lord [this message]
2007-11-14 15:38       ` Sebastian Kemper
2007-11-14 16:00         ` Mark Lord
2007-11-14 17:44           ` [PATCH] libata-scsi: be tolerant of 12-byte ATAPI commands in 16-byte CDBs Mark Lord
2007-11-14 17:50             ` Alan Cox
2007-11-15  2:26             ` Tejun Heo
2007-11-14 16:26     ` libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing Mark Lord
2007-11-14 16:41       ` Mark Lord
2007-11-14 17:11         ` Sebastian Kemper
2007-11-14 17:21           ` Mark Lord
2007-11-15 20:55             ` Bartlomiej Zolnierkiewicz
2007-11-15 20:59               ` Mark Lord
2007-11-14 17:16       ` Sebastian Kemper
2007-11-14 17:49         ` Mark Lord

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