usb: chipidea: Fix ULPI on imx51

[Fabio Estevam <festevam@gmail.com>]

Hi Andrey,

On Thu, Jun 21, 2018 at 6:44 PM, Andrey Smirnov
<andrew.smirnov@gmail.com> wrote:

> I just finished experimenting with it on RDU1 and Babbage boards and I
> can't reproduce the hang that you describe against 4.18-rc1. At this
> point I wonder if it's the bootloader that is a variable that plays
> into this. I was booting both boards with 2018.06.0 version of barebox
> + the custom patches that can be found here
> https://github.com/ndreys/barebox/commits/rdu1-netboot. Note that the
> last patch in that branch/stack was added as a part of this
> investigation, but even before it, I was able to boot Linux just fine,
> albeit without working USB.

Thanks for investigating this issue.

Yes, t is possible that the difference in behaviour that we see could
be related to the fact we use different bootloaders.

In order to make things easier, I am sharing a Buildroot image for
imx51-babbage that contains U-Boot 2018.05 + kernel 4.17.2:
https://www.dropbox.com/s/yevnu4y1zdchnbt/sdcard.img?dl=0

Please flash it directly to the SD card via dd and boot it.

You will notice that it will boot normally. Then please copy a
4.18-rc1 zImage into the first SD card partition and you will notice
the hang.

Thanks
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