From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: SDHCI regression since 2.6.39 Date: Wed, 14 Sep 2011 12:54:08 -0700 Message-ID: <4E710660.1060101@goop.org> References: <4E6EA3E4.5080401@goop.org> <4E6F8C24.3090207@goop.org> <4E6FA44F.1050705@goop.org> <4E6FBCA1.6040307@goop.org> <4E6FC422.9080306@goop.org> <7C3ED924-555D-4C50-9000-36077650328C@marvell.com> <4E6FCE28.5040403@goop.org> <4E6FDA0B.9060007@goop.org> <4E6FDC3E.8030702@goop.org> <003A4041-99F9-4598-AB9A-D08C76CDAECB@marvell.com> <4E6FFADE.5090004@goop.org> <4E70D62B.2030007@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Return-path: Received: from claw.goop.org ([74.207.240.146]:37746 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932905Ab1INTyX (ORCPT ); Wed, 14 Sep 2011 15:54:23 -0400 In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Chris Ball Cc: Philip Rakity , "linux-mmc@vger.kernel.org" , Linux Kernel Mailing List , Manoj Iyer On 09/14/2011 11:38 AM, Chris Ball wrote: > Hi, > > On Wed, Sep 14 2011, Jeremy Fitzhardinge wrote: >> I powered it off with battery unplugged for about an hour, and rebooted >> into the known-working kernel, making sure that any fancy power mgmt >> features were disabled (like aspm), but it still failed in the same way. >> >> I'm wondering if it's simply something like the socket has failed, and >> one or more of the terminals isn't connecting to the card? Though that >> would only show problems on card insertion, but I gather the driver is >> having problems from the moment it detects the controller? > I don't think it's true that we're having any problems talking to the > controller other than with a card inserted -- do you see any errors in > dmesg before inserting a card? > > It could indeed be some kind of signal integrity issue. The easy way to > investigate that would be to boot Windows and see if it works there, and > the hard way would be to find a friendly hardware hacker with a nice scope. I have the original HDD with Windows on it around here somewhere; when I get the chance I'll switch them around and see what Windows thinks of it (I guess if its still failing then its a warranty fix). J