Can share me example script to enable HDMI to MIPI CSI 4-Lane with YUV422 8bit on 576p resolution by using adv7481?
Did you do the experiment on one of our evaluation board and observe the results that you reported?
Seems like this register is related to HDCP, referring the HDCP specification would be helpful.
Please refer this thread at (ADV7480)BCAP setting
Please also visit ADV7481 Design Support Files