netdev - Re: imx7: USB modem reset causes modem to not re-connect

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Message-ID: <CAOMZO5AMy_H-zw1phB6MtNdpbCwtXg74BwHrs5YttykN=-wvnQ@mail.gmail.com>
Date:   Tue, 13 Dec 2022 06:33:29 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Jun Li <jun.li@....com>
Cc:     "bjorn@...k.no" <bjorn@...k.no>,
        Peter Chen <peter.chen@...nel.org>,
        Marek Vasut <marex@...x.de>, netdev <netdev@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>
Subject: Re: imx7: USB modem reset causes modem to not re-connect

Hi Li Jun,

On Tue, Dec 13, 2022 at 5:15 AM Jun Li <jun.li@....com> wrote:

> So this disconnect and then connect is you expected behavior?

Yes, correct.

I found a way to get this behavior in both 5.10 as well as 6.1 kernels:
If I remove the USB_OTG2_OC pinctrl entry and pass
'disable-over-current', it works as expected.

On this board, the MX7D_PAD_UART3_RTS_B__USB_OTG2_OC pad goes to 3.3V
via a 10Kohm pullup resistor.

Could you please explain why removing theUSB_OTG2_OC entry makes things to work?

Thanks