From: Ming Lei Date: Sat, 19 May 2012 15:11:19 +0000 (+0800) Subject: USB: EHCI: fix command register configuration lost problem X-Git-Tag: v3.5-rc1~149^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c01f1d9a603ecf1744ae2d1a015c4b27c2b9fa0;p=pandora-kernel.git USB: EHCI: fix command register configuration lost problem The 3d9545cc375d117554a9b35dfddadf9189c62775(EHCI: maintain the ehci->command value properly) introducs one command register configuration lost problem by the below line in ehci_reset: ehci->command = ehci_readl(ehci, &ehci->regs->command); After writting RESET into command register, it is restored to its default value per EHCI spec[1], so the previous configuration will be lost, and may introduce some problems reported recently: - imx51 Babbage board detect usb hub failed[2], reported by Richard Zhao. - mouse and keyboard hangs in linux-next found by Dan Carpenter and Greg-KH. So this patch just removes the line to fix these problems, and keep configurating command register consistent as before the commit 3d9545cc(EHCI: maintain the ehci->command value properly). [1], 4.1 Host Controller Initialization of EHCI Specification 1.0 [2], failed dmesg log: usb 1-1: new high-speed USB device number 2 using mxc-ehci hub 1-1:1.0: USB hub found hub 1-1:1.0: 7 ports detected mxc-ehci mxc-ehci.1: fatal error mxc-ehci mxc-ehci.1: HC died; cleaning up mxc-ehci mxc-ehci.1: force halt; handshake f5780344 00004000 00004000 -> -110 mxc-ehci mxc-ehci.1: HC died; cleaning up usb 1-1: USB disconnect, device number 2 Reported-by: Richard Zhao Reported-by: Dan Carpenter Reported-by: Greg Kroah-Hartman Cc: Chen Peter-B29397 Acked-by: Alan Stern Signed-off-by: Ming Lei Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed