Does the DisplayPort IP support Fast AUX (FAUX) or Dual mode AUX?
The Display Port Specification document v1.2a Page 353 refers to dual mode AUX, i.e. Manchester and Fast AUX (FAUX) Support.
Fast AUX has been deprecated form the DisplayPort Protocol Specification.
The Xilinx DisplayPort IP does not support FAUX. Hence there is no dual mode support for the Xilinx Display Port IP.