Hi Peter,
>>
>> > Do you have any components at VBUS?
>>
>> There were ESD protection diodes that connected D+/D- with VBUS. We
>> removed those from the PCB and the problem is gone meaning VBUS
>> discharges as expected, the controller runtime-suspends and ultimately
>> systemd-networkd reports a lost carrier.
>> Those diodes haven't been a problem with 4.9, though. Did something change here?
>> I superficially looked at SRP, HNP and ADP, but nothing caught my eye...
>>
>
> You need to disable OTG stuffs at dts if OTG and OTG_FSM are enabled at configuration.
> See below:
>
> 655 &usbotg1 {
> 656 vbus-supply = <®_usb_otg1_vbus>;
> 657 pinctrl-names = "default";
> 658 pinctrl-0 = <&pinctrl_usb_otg1_id>;
> 659 srp-disable;
> 660 hnp-disable;
> 661 adp-disable;
> 662 status = "okay";
> 663 };
>
> Is it available to share your USB part schematic?
We have decided to create a hardware revision. Things like the "USB Plugged-In Detector" that drive DP and DN high will charge up VBUS in our current design and are likely one of the (if not "the") contributing factors to the issue. I will ping back when we have the necessary components to test.
Thanks for your help, Peter!
Cheers,
Kai
