How to enable dual hdmi display

Hi. I wanna get dual hdmi display on jetson-xavier-nx, now the default hdmi(DP1) can display normally. I dont’t know how to do to enable the second hdmi(DP0) work right. I try to find some way in the developer document,but I don’t get some useful ways.

Sorry for the late response, have you managed to get issue resolved or still need the support? Thanks