I use ROCK Pi 4B v1.3, with Debian9Desktop from Radxa download. Kernel 4.4.154-90.
I want to use it as external USB storage for my PC.
I observed that OTG port after connection to host PC is consuming some power from the PC.
The value of current depends on voltage difference between PC USB voltage and ROCK Pi USB voltage.
This current is completely unwanted as it is only charges the voltage regulator on the ROCK Pi board.
Is there the software/hardware way to switch off the 5V power on the USB OTG port ?