TX1 DPAUX_DP_AUXSTAT register...


I found a strange thing…
In TRM file, it said ( DPAUX_DP_AUXSTAT register) :

HPD_STATUS: Reports the current state of the HPD line, plugged or unplugged. This field is
valid at all times, not just at the end of a transaction.

But I found that this register always return 0 before this bit, DPAUX_INTR_AUX_PLUG_EVEN_PENDING of DPAUX_INTR_AUX regter, be triggered.
(I am sure that HPD line are always ON in hardware)

Can help to explain this ???
How can I get correct HPD_STATUS anytime?