Hi
this is a question about HPD polarity difference i found from hardware design guide and official code.
in hardware design guide：
HPD is non-inverting (preserve the polarity of the HPD signal from the display).that is to say， for TX2 NX HPD signal，its high active. see figure below：
in official code：
HPD is low active，so need to invert HPD level in hardware circuit.
see figure below：
which one should we refer to？ hardware design guide or official’s code（need invert HPD signal）?