Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 5 May 2023 11:23:51 +0200
From:   Luca Ceresoli <luca.ceresoli@bootlin.com>
To:     Francesco Dolcini <francesco@dolcini.it>
Cc:     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: <20230505112351.1c79f6b2@booty>
In-Reply-To: <ZFPiRvoF5l8uGzzZ@francesco-nb.int.toradex.com>
References: <23672d66d229d3be4cc854ddf1462c3507f1c2fc.camel@toradex.com>
        <20230504162312.1506763-1-luca.ceresoli@bootlin.com>
        <ZFPiRvoF5l8uGzzZ@francesco-nb.int.toradex.com>
Organization: Bootlin
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk

Hello Francesco,

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.

Are you planning to continue on that work? I would be very glad to test
on product based on the i.MX6ULL Colibri module I am currently working
on.

Best regards,
Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com