Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754267AbaDOSdV (ORCPT ); Tue, 15 Apr 2014 14:33:21 -0400 Received: from www84.your-server.de ([213.133.104.84]:52668 "EHLO www84.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750853AbaDOSdT (ORCPT ); Tue, 15 Apr 2014 14:33:19 -0400 Message-ID: <1397586749.20840.6.camel@vger.seibold.net> Subject: Re: Missing USB XHCI and EHCI reset for kexec From: Stefani Seibold To: Alan Stern Cc: linux-usb , linux-kernel@vger.kernel.org, Greg KH , sarah.a.sharp@linux.intel.com, andreas.brief@rohde-schwarz.com Date: Tue, 15 Apr 2014 20:32:29 +0200 In-Reply-To: References: 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 Am Montag, den 14.04.2014, 13:58 -0400 schrieb Alan Stern: > On Mon, 14 Apr 2014, Stefani Seibold wrote: > > > > > An other PowerPC device which is nearly eactly the same HW but without > > > > this USB HUB works perfectly. > > > > > > Maybe you should replace that hub with a different brand. > > > > > > > Thats not possible, because the Hub is soldered on the board. And it is > > also not a HW issue, since the Hub works perfectly which all previous > > kernels including 3.4. > > One other thing you can try is to increase the reset timeout in > drivers/usb/host/ehci-hub.c. This is under the USB_PORT_FEAT_RESET > case in ehci_hub_control(), around line 1225: > > /* > * caller must wait, then call GetPortStatus > * usb 2.0 spec says 50 ms resets on root > */ > ehci->reset_done [wIndex] = jiffies > + msecs_to_jiffies (50); > > Increasing the 50 to 100 or more might help. > > Alan Stern > I tried this, when i increase the value to 1000, the reset and enumeration process will be faster after a kexec: 28 Seconds vs. 162 Seconds. - Stefani -- 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/