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Date:   Tue, 13 Dec 2022 06:33:29 -0300
From:   Fabio Estevam <>
To:     Jun Li <>
Cc:     "" <>,
        Peter Chen <>,
        Marek Vasut <>, netdev <>,
        USB list <>,
        Alexander Stein <>,
        Schrempf Frieder <>
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 <> 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?


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