SCALER_DISPBKGND_GAMMA
dispbkgndx |= SCALER_DISPBKGND_GAMMA;
dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
dispbkgndx &= ~SCALER_DISPBKGND_GAMMA;
((vc4->gen == VC4_GEN_4) ? SCALER_DISPBKGND_GAMMA : 0) |