Hi,
We've recently changed the HDMI PLL reference clock input in the XPS projects to bring them in sync with the Vivado project. See https://github.com/analogdevicesinc/linux/commit/ad9b7ee56d6f3d4b3682daecb219ce46069ac250 and https://github.com/analogdevicesinc/fpgahdl_xilinx/commit/0e75bdbea3b615071494abd863b03c81af550290
Make sure that both your devicetree and your XPS projects are up-to-date and agree an which clock is used.
- Lars