Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754606Ab3HLVZK (ORCPT ); Mon, 12 Aug 2013 17:25:10 -0400 Received: from rhlx01.hs-esslingen.de ([129.143.116.10]:41034 "EHLO rhlx01.hs-esslingen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752298Ab3HLVZJ (ORCPT ); Mon, 12 Aug 2013 17:25:09 -0400 Date: Mon, 12 Aug 2013 23:25:07 +0200 From: Andreas Mohr To: Thomas Richter Cc: Alan Stern , linux-kernel@vger.kernel.org, Josep Lladonosa , dahinds@users.sourceforge.net, linux-pcmcia@lists.infradead.org, =?utf-8?B?VG9tw6HFoSBLb3bDocSNaWs=?= Subject: Re: [PCMCIA] Solved: No USB 2.0 (ehci) in PCMCIA slot on E7110 Message-ID: <20130812212507.GA12254@rhlx01.hs-esslingen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5207C8D4.1040609@rus.uni-stuttgart.de> X-Priority: none User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3294 Lines: 93 Hi, that means we're talking this one (have you had a look at Bugzilla #15014? Might be useful...): commit 35169529093be3bbef70afd3c4125e35cece7e03 Author: Wolfram Sang Date: Sun Jan 10 09:41:24 2010 +0100 pcmcia/yenta: add module parameter for O2 speedups O2-bridges can do read prefetch and write burst. However, for some combinations of older bridges and cards, this causes problems, so it is disabled for those bridges. Now, as some users know their setup works with the speedups enabled, a new parameter is introduced to the driver. Now, a user can specifically enable or disable these features, while the default is what we have today: detect the bridge and decide accordingly. Fixes Bugzilla entry 15014. Simplify and unify the printouts, fix a whitespace issue while we are here. Signed-off-by: Wolfram Sang Tested-by: frodone@gmail.com [linux@dominikbrodowski.net: whitespace fixes] Signed-off-by: Dominik Brodowski And my git log -p drivers/pcmcia/o2micro.h also mentions commit 1ff84890b62b20823b3697a6041bbec1b5280cee Author: Tomas Kovacik Date: Sun Jul 26 22:04:58 2009 +0200 pcmcia: disable prefetch/burst for OZ6933 Problems have been reported [1], so disable prefetch/burst, to be on the safe side. [1] http://www.mail-archive.com/linux-pcmcia@lists.infradead.org/msg02048.html Signed-off-by: Tomáš Kováčik Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman A useful idea would be to kindly ask Tomáš Kováčik (CC'd) about details of his system (4 years later - but hopefully...), specifically lspci -vv -xxx or some such (especially the revision of that controller might be *different*, so perhaps only *some* 6933 remained affected, whereas newer ones of that possibly more modern chipset ID started to get corrected). Or quite likely there's some sufficiently detailed lspci log of that hardware out on the internet somewhere... Note that there's the comment "for some bridges it is at 0x94, for others at 0xD4. it's * ok to write to both registers on all O2 bridges." , yet our 6933 support lines were added *later*, so there's a faint possibility that the compatibility statement actually does not apply to this chipset. And of course there remains the question *why* such slow communication would then cause such severe USB HC communication trouble. There might be some safeguard missing there as well... And kudos to the patch submitters for having supplied such nicely detailed commit logs! (although mentioning the title of URLs probably would have been even better) > Note that this is only a 1.7Ghz Pentium-4-M dinosaur. That means you really don't want to know which kinds of machines I am using ;) (yes, I'm sitting at a CardBus box here, too) ((TI CardBus controller)) Greetings, Andreas Mohr (KA/S) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/