However, you may refer to MIPI DSI/CSI-2 to OpenLDI LVDS Interface Bridge (link: https://www.latticesemi.com/products/designsoftwareandip/intellectualproperty/referencedesigns/referencedesign03/mipidsicsi2openldilvds).
It involves the 2 IP plus FPDLink Transmitter. You can try to remove the FPDLink Transmitter part and implement the 2 IPs mentioned.