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

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Message-ID: <CAOMZO5AyAegbvUtX42by99mU8yQfi91bmhJfd9iqu1Ak0dEHiw@mail.gmail.com>
Date:   Wed, 20 Jun 2018 19:07:59 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Peter Chen <peter.chen@....com>,
        USB list <linux-usb@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <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

Hi Andrey,

On Wed, May 30, 2018 at 2:34 PM, Andrey Smirnov
<andrew.smirnov@...il.com> 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 <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-usb@...r.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>

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