factor_mode
alpha->src_color_ctrl.bits.factor_mode = SRC_FAC_ALPHA_SRC_GLOBAL;
alpha->src_color_ctrl.bits.factor_mode = SRC_FAC_ALPHA_ONE;
alpha->src_color_ctrl.bits.factor_mode = SRC_FAC_ALPHA_SRC_GLOBAL;
alpha->dst_color_ctrl.bits.factor_mode = ALPHA_SRC_INVERSE;
alpha->src_alpha_ctrl.bits.factor_mode = ALPHA_ONE;
alpha->dst_alpha_ctrl.bits.factor_mode = ALPHA_SRC_INVERSE;
u32 factor_mode:3;