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

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Date:	Wed, 14 Nov 2007 12:49:03 -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:
> 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.
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