We are designing a custom Orin NX carrier that must support both HDMI and DisplayPort, but only one at a time. Our board will have two separate connections, with only one will be connected to a display at any given time. We have been testing with three different “off the shelf” Orin NX carriers, two that support only DP and another that supports only HDMI. We have verified that we can move an NX module from the DP carriers to the HDMI carrier and vice-versa, with no absolutely no changes to the software or configuration of the NX module, and that both display types work fine with their respective carriers. So there is something in hardware (a difference between the different carriers) that is causing the NX (hardware or firmware) to detect that it should change from DP to HDMI and vice-versa. In reviewing the Nvidia DP and HDMI reference designs, the only thing we can think of is that the NX is somehow using DPAUX as an indicator of whether DP or HDMI mode should be used. Is that correct, or is there some other hardware mechanism that the NX uses to select DP vs. HDMI output?
Just some points from my side first.
The reason you don’t need software change to support DP and HDMI at same time is because Orin supports DP++. Which means when HDMI is connected, it can output too.
However, our DP++ is not able to support up to 4k resolution. If you need 4k resolution, then you must configure software to HDMI mode.
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