linux-kernel - Re: [PATCH 2/2] firewire: add a parameter to force the speed of the devices.

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Message-ID: <553658A0.8060409@ladisch.de>
Date:	Tue, 21 Apr 2015 16:03:12 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Laurent Vivier <laurent@...ier.eu>,
	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] firewire: add a parameter to force the speed of the
	devices.

Laurent Vivier wrote:
> I was trying to use my old iPod mini firewire (first generation) with
> a new firewire card I put in my PC (VIA Technologies, Inc. VT6306/7/8),
> but the iPod was not mounted and failed with the following error:
>     reading config rom failed: no ack
> It appears that the configuration rom cannot be read after the
> device max speed is set to something else than SCODE_100.
>
> According to the iPod configuration ROM, it should support SCODE_400.
>
> This patch adds a a parameter (force_speed) to the firewire-core module
> to be able to set the max speed to use with the firewire devices.

Why a module parameter?  Why not automatically apply this workaround to
this specific device?


Regards,
Clemens
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