imx8mm/imx8mn hang on usb stop / ehci_shutdown

[Fabio Estevam]

Hi Tim,

On Thu, Apr 27, 2023 at 3:46 PM Tim Harvey <tharvey at gateworks.com> wrote:

> Fabio,
>
> Do you have another board to test with that uses both imx8mm usb host
> controllers? With your imx8mm dtsi sync added a simple 'usb start'
> hangs on my imx8mm-gw71xx board when the second controller is enabled:
> starting USB...
> Bus usb at 32e40000: USB EHCI 1.00
> Bus usb at 32e50000:

No other imx8mm-based board here at the moment, sorry.

Without the imx8mm.dtsi sync patch, I was able to reproduce the hang
after running "usb start && usb stop".

After the imx8mm.dtsi sync patch, I do not see the hang.

> I don't believe the imx8mm-evk even has proper USB support in general
> (which is probably why CMD_USB is not enabled). Only one port is
> enabled in the dt and If I connect a USB-C to host cable with device
> in it to that port a 'usb tree' does not even show the device
> enumerated.

Yes, in U-Boot there is no ptn5110 driver, so the imx8mm-evk is not complete.