USB speed is capped to Full Speed when using a custom UTMI PHY

[jeanthom]

Hi,

I recently noticed that when using Luna with a custom UTMI PHY, it would limit itself to USB FS. The limit is a hardcoded value:

luna/luna/gateware/usb/usb2/device.py

Lines 118 to 123 in 6a8d1e5

	else:
	self.utmi = bus
	self.bus_busy = Const(0)
	self.translator = None
	self.always_fs = True
	self.data_clock = 12e6

There is no technical limitation preventing us from doing USB HS: we tested a modification of these constants successfully with a ULPI-UTMI translator.

Jean