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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 12:49:03 -0500	[thread overview]
Message-ID: <473B350F.3030003@rtr.ca> (raw)
In-Reply-To: <20071114171618.GB9387@section-eight>

Sebastian Kemper wrote:
> On Wed, Nov 14, 2007 at 11:26:06AM -0500, Mark Lord wrote:
>> Another way to the same thing is with "hdparm -E",
>> which contrary to my earlier posting actually does
>> seem to work already with libata.
> 
> Hi!
> 
> There are DVD-ROM drives that don't react to hdparm -E but do react to
> SET_STREAMING, for instance some NEC drives.
..

Mmm.. that's possible.  The NEC drive I have here works with either.

I wonder if an update to sr_select_speed() (inside the SCSI code) is needed?
It currently uses GPCMD_SET_SPEED, with no fallback to GPCMD_SET_STREAMING.

Or I suppose this is best left to userspace.
I may change hdparm to try both opcodes.

      reply	other threads:[~2007-11-14 17:49 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
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 [this message]

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