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	Fri, 9 Aug 2013 15:32:44 -0400
Date: Fri, 9 Aug 2013 15:32:43 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
To: Oleksij Rempel <linux@rempel-privat.de>
cc: Christian Lamparter <chunkeey@googlemail.com>,
	Sarah Sharp <sarah.a.sharp@linux.intel.com>,
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Subject: Re: FUSB200 xhci issue
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On Fri, 9 Aug 2013, Oleksij Rempel wrote:

> > Is there any way to prevent the device from losing its firmware during
> > a USB reset or suspend?
> 
> For suspend - yes. It is possible to ignore suspend command or put the 
> SoC in low power mode - but is it probably not so easy to bring it back. 
> I would need to read more code and create some doc as side effect untill 
> i understand how it works.
> I'm not sure how about reset command. I would need more testing and some 
> ones help. If i see it correctly, usb reset should affect only usb core 
> and usb pll.
> 
> How can i trigger usb reset?

http://marc.info/?l=linux-usb&m=121459435621262&w=2

Give the program the pathname for the USB device node.  For example:

	usbreset /dev/bus/usb/001/004

Alan Stern