IFTU Registers

MMIO Interfaces
It looks like the display controller has 4 overlay planes (Iftu0RegA, Iftu0RegB, Iftu1RegA, Iftu0RegB) and 1 cursor plane (Iftu2Reg)?

IftuRegs
Where n can be 0 and 1. n = 0 configures the plane for the CRTC 0 (OLED/LCD) scanout, and n = 1 configures the plane for the CRTC 1 (HDMI) scanout.

IftucRegs (control registers?)
Where i can be 0 or 1 for RegA or RegB.