linux-kernel - [PATCH/RFC] parport_pc: remove ancient, overeager quirk that disables EPP support on many chipsets

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Message-Id: <201109151133.19211.leo@alaxarxa.net>
Date:	Thu, 15 Sep 2011 11:33:18 +0200
From:	"Leopold Palomo-Avellaneda" <leo@...xarxa.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-parport@...ts.infradead.org, 630593@...s.debian.org,
	Nicos Gollan <gollan@...ormatik.uni-kl.de>,
	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Alexander Gordeev <lasaine@....cs.msu.su>,
	Jonathan Nieder <jrnieder@...il.com>
Subject: [PATCH/RFC] parport_pc: remove ancient, overeager quirk that disables EPP support on many chipsets

Hi,

there's a bug in the parport module that have been reported (in another 
places) some time ago [1]. Also, this bug was reported at Redhat [2], but 
nobody follow the report and it was closed.

As Adam baked said [1] :

<quote>
A long time ago (~ 10 years), Intel produced a chipset that 
included broken EPP support. The Linux parport driver was written to detect 
such a chipset and disable EPP support on it. Unfortunately the test that was 
written gives false positives for many current chipsets and no-one seems to 
know exactly what the problem hardware was, let alone have a sample of it to 
see if a better test can be written. After such a long time it is probably 
appropriate to just remove the test (on average it does more harm than good) 
however you are correct in asserting the driver is unmaintained so no-one is 
bothering to fix it.
</quote>

I have applied the patch to the standard debian kernel and vanilla kernels and 
runs perfectly. The patch simply erases a check. Applied to some Dell 
hardware, now the EPP mode is detected and, after some initial tests it's 
working.

Please, apply the patch.

Best regards,

Leo

[1] http://lists.infradead.org/pipermail/linux-parport/2008-March/000628.html
[2] https://bugzilla.redhat.com/show_bug.cgi?id=284471

View attachment "patch_parport_bug.patch" of type "text/x-patch" (628 bytes)