linux-kernel - RE: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm

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Message-ID: <AM7PR04MB71572600CE73140FE13CB17C8B7B0@AM7PR04MB7157.eurprd04.prod.outlook.com>
Date:   Mon, 20 Jul 2020 03:44:34 +0000
From:   Peter Chen <peter.chen@....com>
To:     Philippe Schenker <philippe.schenker@...adex.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "festevam@...il.com" <festevam@...il.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, Jun Li <jun.li@....com>
Subject: RE: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm

 
> On Wed, 2020-07-15 at 00:51 +0000, Peter Chen wrote:
> >
> > > The Toradex Colibri iMX6ULL board has a special USB hardware design.
> > > With runtime-pm enabled USB reset itself continuously. Furthermore
> > > the OTG port is also not enumerating devices if the Chipidea IP is
> > > in runtime sleep mode and a device or host gets plugged in.
> > >
> >
> > Hi Philippe,
> >
> > You may describe the detail what's the special USB hardware design for
> > your board,
> 
> If I only knew the root-cause of that problem - unfortunately I don't.
> That's also why I have such a hard time to describe it.
> 
> > and why it causes the problem, and why disable runtime pm could fix
> > this issue, then,
> 
> I cannot provide the 'why' part yet. I'll try something more and hope I can provide
> you guys with the exact description.
> 
> > the other users could know if it could apply to their platforms or not
> > in future.
> 
> I only found out about it because you were pointing me in that direction. I debugged
> for hours now and didn't came to the root-cause of the issue. I think to really
> understand it I would need to know much more about the Chipidea IP.
> 
> I'll get back to you guys with a proposal for a new description.
> 

Philippe, is it possible to share your USB hardware design at 6ULL?
And how ci_hdrc_gadget_connect is called when the runtime pm is disabled?

Thanks,
Peter