diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index a019cc9bbd54dbb4b0212408d7629dd8ce1ee0c0..c4a372286580dae51e7c166818b09e362b31cfc8 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -268,12 +268,23 @@ static bool vop2_cluster_window(const struct vop2_win *win)
 	return win->data->feature & WIN_FEATURE_CLUSTER;
 }
 
+/*
+ * Note:
+ * The write mask function is documented but missing on rk3566/8, writes
+ * to these bits have no effect. For newer soc(rk3588 and following) the
+ * write mask is needed for register writes.
+ *
+ * GLB_CFG_DONE_EN has no write mask bit.
+ *
+ */
 static void vop2_cfg_done(struct vop2_video_port *vp)
 {
 	struct vop2 *vop2 = vp->vop2;
+	u32 val = RK3568_REG_CFG_DONE__GLB_CFG_DONE_EN;
+
+	val |= BIT(vp->id) | (BIT(vp->id) << 16);
 
-	regmap_set_bits(vop2->map, RK3568_REG_CFG_DONE,
-			BIT(vp->id) | RK3568_REG_CFG_DONE__GLB_CFG_DONE_EN);
+	regmap_set_bits(vop2->map, RK3568_REG_CFG_DONE, val);
 }
 
 static void vop2_win_disable(struct vop2_win *win)