linux-kernel - Re: usb gadget on zaurus and kexec

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Date:	Thu, 10 Jun 2010 15:14:52 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Eric Miao <eric.y.miao@...il.com>, dbaryshkov@...il.com,
	Cyril Hrubis <metan@....cz>, arminlitzel@....de,
	kernel list <linux-kernel@...r.kernel.org>, utx@...guin.cz,
	lenz@...wisc.edu, rpurdie@...ys.net, pave@....cz,
	thommycheck@...il.com, zaurus-devel@...ts.linuxtogo.org,
	omegamoon@...il.com
Subject: Re: usb gadget on zaurus and kexec

Marek Vasut <marek.vasut@...il.com> writes:

>> > Dumping out the registers of the two situations and doing a comparison
>> > then might be a quick way.
>> 
>> Any debugging update on this?
>
> Yeah, there's a workaround. Cyril's working on a proper fix, but that might take 
> some time. Simply -- UP2OCR is misconfigured.

That's quite interesting. In the pxa27x_udc gadget driver, I seem to have a
regression on the resume from suspend to RAM path. My USB UDC is not enumerated
anymore.

The might be a correlation, as UP2OCR is lost in the suspend process. I'm very
interested by your analysis of the issue you have on kexec, as that might ease
my work :)

Besides, it's been some time I've been thinking that the pxa deserves a proper
encapsulation of the USB internal routing paths (ie. a proper way to switch from
usb host handled by ohci-pxa27x to an usb client handled by pxa2x_udc), to
reflect the setup of the Pad Unit (see TRM chapter 12.4 : tables 12.2, 12.15,
12.17, 12.18 and 12.19).

Whatever you find on the USB Port2 configuration register would help me design
the Pad block.

Cheers.

--
Robert
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