linux-kernel - Re: [PATCH] usb: chipidea: Fix ULPI on imx51

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Date:   Thu, 21 Jun 2018 14:44:54 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Peter Chen <peter.chen@....com>, linux-usb@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: Re: [PATCH] usb: chipidea: Fix ULPI on imx51

On Thu, Jun 21, 2018 at 7:08 AM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Andrey,
>
> On Thu, Jun 21, 2018 at 9:47 AM, Andrey Smirnov
> <andrew.smirnov@...il.com> wrote:
>
> > I never assumed it was a regression and that USB worked on RDU1 board
> > before, so I never tried to see if this was a regression. I can only
> > tell you that it hangs as soon as any PORTSC registers are accessed.
>
> I think we need to investigate this portsc register hang further.
>

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.

Any chance you can try it on your end and see if that makes a difference?

Thanks,
Andrey Smirnov