DISP_ARB_CTL2
intel_de_rmw(display, DISP_ARB_CTL2, DISP_DATA_PARTITION_5_6,
hw->partitioning = (intel_de_read(display, DISP_ARB_CTL2) &
intel_de_rmw(display, DISP_ARB_CTL2, DISP_IPC_ENABLE,
MMIO_D(DISP_ARB_CTL2);