linux-kernel - Re: [PATCH 6/8] firewire: ohci: add module parameter to activate quirk fixes

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Message-ID: <4B81B317.1050007@s5r6.in-berlin.de>
Date:	Sun, 21 Feb 2010 23:26:31 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] firewire: ohci: add module parameter to activate
 quirk fixes

I wrote:
> This way, we can advise users of precompiled kernel packages to test
> existing quirk fixes on chips which have not been listed yet, without
> them having to build a kernel from source.

PS: Jay Fenlason posted a very similar patch already in November.  In
the meantime, the forceful disappearance of dual-buffer issues has made
such a facility less relevant, but the addition of the cycle timer quirk
fix made it a useful idea again.

> Note, to use this feature on a machine with more than one controller,
> steps like these are necessary:
> # lspci | grep 1394
> # ls /sys/bus/pci/drivers/firewire_ohci/
> # echo -n "0000:03:02.0" > /sys/bus/pci/drivers/firewire_ohci/unbind
> # echo 2 > /sys/module/firewire_ohci/parameters/quirks
> # echo -n "0000:03:02.0" > /sys/bus/pci/drivers/firewire_ohci/bind
> # echo 0 > /sys/module/firewire_ohci/parameters/quirks
[...]
>  
> +/* This overrides anything that was found in ohci_quirks[]. */
> +static int param_quirks;

PS2: The parameter can also be used to switch off quirk flags that were
hardwired into firewire-ohci's quirks table.  Simply specify a non-zero
quirks value but without any known flags; e.g. 0x100.
-- 
Stefan Richter
-=====-==-=- --=- =-=-=
http://arcgraph.de/sr/
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