diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
index 939e7bd63bcc..264ed8bb2b91 100644
--- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
+++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
@@ -1086,7 +1086,8 @@ static const struct vop_win_phy rk3036_win0_data = {
 	.yrgb_vir = VOP_REG(RK3036_WIN0_VIR, 0xffff, 0),
 	.uv_vir = VOP_REG(RK3036_WIN0_VIR, 0x1fff, 16),
 	.alpha_mode = VOP_REG(RK3036_DSP_CTRL0, 0x1, 18),
-	.alpha_en = VOP_REG(RK3036_ALPHA_CTRL, 0x1, 0)
+	.alpha_en = VOP_REG(RK3036_ALPHA_CTRL, 0x1, 0),
+	.alpha_pre_mul = VOP_REG(RK3036_DSP_CTRL0, 0x1, 29),
 };
 
 static const struct vop_win_phy rk3036_win1_data = {
@@ -1421,7 +1422,8 @@ static const struct vop_win_phy rk3126_win1_data = {
 	.yrgb_mst = VOP_REG(RK3126_WIN1_MST, 0xffffffff, 0),
 	.yrgb_vir = VOP_REG(RK3036_WIN1_VIR, 0xffff, 0),
 	.alpha_mode = VOP_REG(RK3036_DSP_CTRL0, 0x1, 19),
-	.alpha_en = VOP_REG(RK3036_ALPHA_CTRL, 0x1, 1)
+	.alpha_en = VOP_REG(RK3036_ALPHA_CTRL, 0x1, 1),
+	.alpha_pre_mul = VOP_REG(RK3036_DSP_CTRL0, 0x1, 29),
 };
 
 static const struct vop_win_data rk3126_vop_win_data[] = {