linux-kernel - My SD Card Reader cannot read SDHC cards

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Message-ID: <50B9F233.5040902@gentoo.org>
Date:	Sat, 01 Dec 2012 07:04:03 -0500
From:	Richard Yao <ryao@...too.org>
To:	Kernel development list <linux-kernel@...r.kernel.org>
CC:	kernel@...too.org
Subject: My SD Card Reader cannot read SDHC cards

I have the following SD Card Reader:

http://support.dell.com/support/edocs/monitors/2405fpw/en/about.htm#Card
Reader Specificatoins

It is identified as the following in lsusb:

Bus 002 Device 007: ID 0424:223a Standard Microsystems Corp. 8-in-1 Card
Reader

I have a LG microSD Card adapter that came with a LG Optimus V and a 4GB
Kingston SDHC microSD card. I also have a 2GB SDSC card that works. When
using the microSD card with the adapter, nothing immediate happens. The
following messages appear in dmesg when I do `fdisk -lu /dev/sde`:

[ 2075.817148] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2106.777063] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2116.973078] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2133.171089] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2133.369081] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2143.565096] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2143.688984] sd 10:0:0:3: Device offlined - not ready after error recovery
[ 2174.889137] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2185.801154] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2196.777168] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2207.785189] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd
[ 2238.825093] usb 2-4.2: reset high-speed USB device number 7 using
ehci_hcd

Would someone provide me with a brief description of where the code that
talks to the SD Card reader lives in Linus' tree and how it works? I am
not familiar with this subsystem, so I need some pointers before I can
look into whether or not I can make it work.

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