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Date:   Fri, 5 May 2023 12:58:45 +0200
From:   Francesco Dolcini <francesco@dolcini.it>
To:     Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc:     Francesco Dolcini <francesco@dolcini.it>,
        devicetree@vger.kernel.org, festevam@gmail.com,
        gregkh@linuxfoundation.org, jun.li@nxp.com, kernel@pengutronix.de,
        linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        peter.chen@nxp.com, robh+dt@kernel.org, s.hauer@pengutronix.de,
        shawnguo@kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        francesco.dolcini@toradex.com
Subject: Re: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm
Message-ID: <ZFThZc7NW4AV99hy@francesco-nb.int.toradex.com>
References: <23672d66d229d3be4cc854ddf1462c3507f1c2fc.camel@toradex.com>
 <20230504162312.1506763-1-luca.ceresoli@bootlin.com>
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 <20230505112351.1c79f6b2@booty>
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On Fri, May 05, 2023 at 11:23:51AM +0200, Luca Ceresoli wrote:
> On Thu, 4 May 2023 18:50:14 +0200
> Francesco Dolcini <francesco@dolcini.it> wrote:
> 
> > Hello Luca,
> > I guess your mail to Philippe bounced, let me try to answer since I am aware
> > of the issue here.
> > 
> > On Thu, May 04, 2023 at 06:23:12PM +0200, Luca Ceresoli wrote:
> > > I found this thread after several hours spent in debugging why USB host is
> > > not detecting new devices on a custom board using the iMX6ULL Colibri
> > > SoM.
> > > 
> > > My best workaround at the moment is:  
> > We have the same workaround in our BSP since quite some time, see
> > https://git.toradex.com/cgit/meta-toradex-bsp-common.git/tree/recipes-kernel/linux/linux-toradex-mainline-git/0002-drivers-chipidea-disable-runtime-pm-for-imx6ul.patch
> > 
> > > I haven't found any follow-up patches from you, so I'm wondering whether
> > > you have made any progress on this issue.  
> > You can find the latest discussion on that regard here
> > https://lore.kernel.org/all/Y1vLpaxpc5WBCuGD@francesco-nb.int.toradex.com/
> 
> Thanks for this pointer! I have read the discussion and it was a bit
> confusing, especially about whether the hardware can work at all.

It can work. Hardware wise is just fine, software wise I tried to
explain how in my previous answer to you. Worst case we would have to
describe the hardware in a different way in the DTS, but I do not expect
this to be required.

> Are you planning to continue on that work?

Hopefully NXP / Li Jun will be able to help.

Francesco