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

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Date:   Thu, 21 Jun 2018 17:12:24 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Fabio Estevam <festevam@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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

>>> 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?
>>>
> 
> 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.

Hang at register access usually means that module that owns the register
is not clocked.