alpha_cal_mode
alpha->src_color_ctrl.bits.alpha_cal_mode = ALPHA_SATURATION;
alpha->dst_color_ctrl.bits.alpha_cal_mode = ALPHA_SATURATION;
alpha->src_alpha_ctrl.bits.alpha_cal_mode = ALPHA_SATURATION;
alpha->dst_alpha_ctrl.bits.alpha_cal_mode = ALPHA_NO_SATURATION;
u32 alpha_cal_mode:1;