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

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Date:	Mon, 14 Apr 2014 18:35:35 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	Alan Stern <stern@...land.harvard.edu>
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

Am Montag, den 14.04.2014, 12:27 -0400 schrieb Alan Stern:
> On Mon, 14 Apr 2014 stefani@...bold.net wrote:
> 
> > Zitat von Alan Stern <stern@...land.harvard.edu>:
> > 
> > 
> > >> <6>[  167.936921] usb 2-2.1: new full-speed USB device number 3  
> > >> using ohci-pci
> > >> <6>[  168.067890] usb 2-2.1: New USB device found, idVendor=076b,
> > >> idProduct=a021
> > >> <6>[  168.074871] usb 2-2.1: New USB device strings: Mfr=1, Product=2,
> > >> SerialNumber=0
> > >> <6>[  168.082226] usb 2-2.1: Product: Smart Card Reader
> > >> <6>[  168.086963] usb 2-2.1: Manufacturer: USB
> > >> <6>[  168.172893] usb 2-2.2: new low-speed USB device number 4  
> > >> using ohci-pci
> > >> <6>[  168.300839] usb 2-2.2: New USB device found, idVendor=0aad,
> > >> idProduct=0024
> > >> <6>[  168.307823] usb 2-2.2: New USB device strings: Mfr=1, Product=2,
> > >> SerialNumber=0
> > >> <6>[  168.315180] usb 2-2.2: Product: FrontPanel USB Keyboard
> > >> <6>[  168.320436] usb 2-2.2: Manufacturer: Rohde&Schwarz
> > >> <6>[  168.337895] input: Rohde&Schwarz FrontPanel USB Keyboard as
> > >> /devices/pci0000:00/0000:00:17.0/usb2/2-2/2-2.2/2-2.2:1.0/input/input0
> > >> <6>[  168.360988] input: Rohde&Schwarz FrontPanel USB Keyboard as
> > >> /devices/pci0000:00/0000:00:17.0/usb2/2-2/2-2.2/2-2.2:1.1/input/input1
> > >
> > > Since some devices work and some don't, maybe part of the problem lies
> > > in the particular devices.
> > >
> > 
> > The problem lies on the "Bus 001 Device 002: ID 0424:2514 Standard  
> > Microsystems Corp. USB 2.0 Hub", which hangs for arround 162 seconds  
> > after a kexec.
> > 
> > The "Bus 002 Device 003: ID 076b:a021 OmniKey AG CCID Smart Card  
> > Reader" and "Bus 002 Device 004: ID 0aad:0024 Rohde & Schwarz GmbH &  
> > Co. KG" are attached to this Hub.
> 
> Actually, it looks like they are plugged into the Texas Instruments
> hub, not the Standard Microsystems hub (because they are on bus 2, not
> bus 1).  Did you rearrange the USB cables?
> 

You are right, sorry for the confusion. I can't rearrange the cables
because the HUB is on board.

> > 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.

> > >> This is the output of lsusb:
> > >>
> > >> Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
> > >> Bus 001 Device 004: ID 0928:0007 Oxford Semiconductor, Ltd
> > >> Bus 002 Device 002: ID 0451:2036 Texas Instruments, Inc. TUSB2036 Hub
> > >> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > >> Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > >> Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > >> Bus 002 Device 003: ID 076b:a021 OmniKey AG CCID Smart Card Reader
> > >> Bus 002 Device 004: ID 0aad:0024 Rohde & Schwarz GmbH & Co. KG
> 
> Here, the only device that might be plugged into the Standard
> Microsystems hub is the Oxford Semiconductor thing (whatever it is).
> 
> > > What about if you just do:
> > >
> > > 	rmmod ehci-pci
> > > 	modprobe ehci-pci
> > >
> > 
> > The kernel is monolitic because the USB HW is needed in a early boot  
> > stage. The problem also occurs with ehci-fsl used in by an other  
> > PowerPC device, which is a part of the SoC and is not attached to the  
> > PCI bus.
> > 
> > One thing is that the "echo 1  
> >  >/sys/bus/pci/drivers/ehci-pci/0000\:00\:17.2/reset" workaround will  
> > no longer work for kernel 3.14.
> 
> Instead, you could try
> 
> 	echo 0000:00:17.2 >/sys/bus/pci/drivers/ehci-pci/unbind
> 	echo 0000:00:17.2 >/sys/bus/pci/drivers/ehci-pci/bind
> 

I am now at home. I will do this tomorrow. Thanks so much for your
support.

- Stefani



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