I am attempting to manually mute the output of the ADV7623 when an HDCP error occurs (e.g. when the sink does not support HDCP). The I2C errors are occurring as expected, and I am able to manually mute the output to 'red', but only after I disable the HDCP process (HDCP desired false, frame false). As soon as I turn HDCP back on, the screen immediately turns black while HDCP negotiation starts up again (and constantly fails in this case).
I would like to keep the ADV7623 output manually muted red the entire time HDCP negotiation is taking place - even if its failing. Is this possible? Also, what causes the black output - is this default behavior of the 7623? Is the color changeable? During the failure when black is visible, I see that the CP map register 0xBF is 0x1E, indicating that the blackout is set - clearing the blackout bit doesn't change anything.