Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755900AbaDMTXb (ORCPT ); Sun, 13 Apr 2014 15:23:31 -0400 Received: from www84.your-server.de ([213.133.104.84]:33800 "EHLO www84.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755000AbaDMTXa (ORCPT ); Sun, 13 Apr 2014 15:23:30 -0400 Message-ID: <1397416959.1555.30.camel@vger.seibold.net> Subject: Missing USB XHCI and EHCI reset for kexec From: Stefani Seibold To: linux-usb , "linux-kernel@vger.kernel.org" , Greg KH , Alan Stern , sarah.a.sharp@linux.intel.com Date: Sun, 13 Apr 2014 21:22:39 +0200 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-Sender: stefani@seibold.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When executing a kexec kernel on a PowerPC board the new started kernel will not find already enumerated USB devices due a missing reset on the USB bus. As a work around a echo 1 >/sys/bus/pci/drivers/[ex]hci-pci/BUS-ADDRESS-OF-THE-HCD/reset will solve this. But this is far from beauty. My latest kernel without this issue was for EHCI kernel 2.6.39 and for XHCI kernel 3.4, but i have no idea when exactly this behavior was introduced. For X86 all is fine. -- 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/