[PATCH] ARM: dts: imx6qdl-udoo: Disable USB host to work around boot issues

[Fabio Estevam]

[Adding Baruch and Josua]

On Sun, May 1, 2022 at 2:47 PM Mark Brown <broonie at kernel.org> wrote:
>
> Attempting to boot my Udoo Dual and Quad with mainline hangs during boot
> after printing:
>
> [    3.270471] imx_usb 2184000.usb: No over current polarity defined
> [    3.922502] mxs_phy 20c9000.usbphy: Data pin can't make good contact.
> [    3.940097] imx_usb 2184200.usb: No over current polarity defined
>
> where imx_usb 2184200.usb is usbh1 in the DT. Adding debug prints to the
> code seems to show that we lock up at the first read in usbmisc_imx6q_init()
> which in combination with the above logging about the USB controllers
> suggests that we lock up on the first read in usbmisc_imx6q_init(). Looking
> at some of the other i.MX6 boards and the warning messages that are being
> printed suggests that there is bitrot in the DTS for the device so disable
> it for now, with it disabled the board boots successfully.  Clearly this is
> not a real fix, but it does allow some use of the board with mainline.
>
> Similar behaviour is seen all the way back as far as v4.19, I tried going
> back to when the board was added but had toolchain issues. Vendor provided
> binaries seem fine on the boards so it seems likely that the hardware is
> fine and the issue is with some combination of the DT and kernel.  This
> should obviously be resolved properly but for now this at least allows
> the kernel to boot with reduced functionality on these systems.

My imx6-cubox is no longer functional, so I cannot verify this myself.

Baruch and Josua,

Are you aware of this issue?

Thanks