linux-kernel - Re: Missing USB XHCI and EHCI reset for kexec

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Message-ID: <Pine.LNX.4.44L0.1404141354360.874-100000@iolanthe.rowland.org>
Date:	Mon, 14 Apr 2014 13:58:20 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Stefani Seibold <stefani@...bold.net>
cc:	linux-usb <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com>,
	<sarah.a.sharp@...ux.intel.com>, <andreas.brief@...de-schwarz.com>
Subject: Re: Missing USB XHCI and EHCI reset for kexec

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

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