Hi Andrey,

On Wed, May 30, 2018 at 2:34 PM, Andrey Smirnov
[off-list ref] wrote:

Workaround introduced for i.MX53 in be9cae2479f48 ("usb: chipidea:
imx: Fix ULPI on imx53") seems to be applicable in case of i.MX51 as
well. Running latest kernel on ZII RDU1 Board (imx51-zii-rdu1.dts)
exhibits a kernel frozen on PORTSC access and applying the workaround
resolves the issue.

Cc: Peter Chen <redacted>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Cc: Fabio Estevam <redacted>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Chris Healy <redacted>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-usb at vger.kernel.org
Signed-off-by: Andrey Smirnov <redacted>

This patches causes a regression on a imx51-babbage running 4.18-rc1:
I get a kernel hang.

If I revert it on top of 4.18-rc1, then it boots fine and USB host is
functional.

I understand this patch fixes a kernel hang for you, so which commit
is responsible for the hang you observe?

It seems this commit fixes a hang for you and causes another hang for me :-)

Any ideas?

Thanks