dwc2: Transaction errors with device connected at boot

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Hi Paul,

I'm running into an issue with the dwc2 driver. When I power on my board
with an usb device (mass storage in this case) connected, the hardware
is returning transaction errors (e.g., triggering channel halted +
xacterr interrupts) for every transfer scheduled, starting with the
first ones.

This condition stays even through a reboot, though a power cycle cures
the condition (provided I remove the USB device for the boot). If I
insert the USB device after the board has booted and the driver has
loaded, everything works as expected, also after a reboot (with the
device still plugged in).

This leads me to suspect there is some issue when the time between the
first hardware initialization and the first host channel start is too
small or something like that? Any ideas?

Also, is there any fixed list of what could cause a transaction error,
or is this just a catchall meaning "Something went wrong"?

Thanks,

Matthijs
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