linux-kernel - USB Host port inoperative after kexec on Beagleboard

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Date:	Tue, 10 Jan 2012 09:02:19 +1100
From:	Peter Chubb <peter.chubb@...ta.com.au>
To:	Will.deacon@....org
CC:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	linux-omap@...r.kernel.org
Subject: USB Host port inoperative after kexec on Beagleboard

Hi Will,
   Thanks for the fixes to kexec for ARM that went into mainline this
   week.  Mostly things work now.

   One issue: the USB EHCI port on the (rev C2) beagleboard doesn't
   work after a kexec.  During boot after kexec, the host device is
   detected and initialised, but nothing plugged in works, even when
   everything was working corectly before the kexec.  Das U-boot
   must set up something that is then undone during the kexec reboot.

   I've traced all calls to clk_enable() and clk_disable(), and
   everything looks all right --- in particular I can't see 
   anything explicitly disabled during kexec that isn't reenabled
   during boot of the subsequent kernel.

   Voltages that I can measure look correct on the port.

   Do you have any suggestions as to what else could be wrong?
--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
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