diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
index 61833cc1c699..4f076c364f25 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
@@ -565,27 +565,26 @@ void __rcar_du_plane_setup(struct rcar_du_group *rgrp,
 	}
 }
 
-static int rcar_du_plane_atomic_check(struct drm_plane *plane,
-				      struct drm_plane_state *state)
+int __rcar_du_plane_atomic_check(struct drm_plane *plane,
+				 struct drm_plane_state *state,
+				 const struct rcar_du_format_info **format)
 {
-	struct rcar_du_plane_state *rstate = to_rcar_plane_state(state);
-	struct rcar_du_plane *rplane = to_rcar_plane(plane);
-	struct rcar_du_device *rcdu = rplane->group->dev;
+	struct drm_device *dev = plane->dev;
 
 	if (!state->fb || !state->crtc) {
-		rstate->format = NULL;
+		*format = NULL;
 		return 0;
 	}
 
 	if (state->src_w >> 16 != state->crtc_w ||
 	    state->src_h >> 16 != state->crtc_h) {
-		dev_dbg(rcdu->dev, "%s: scaling not supported\n", __func__);
+		dev_dbg(dev->dev, "%s: scaling not supported\n", __func__);
 		return -EINVAL;
 	}
 
-	rstate->format = rcar_du_format_info(state->fb->format->format);
-	if (rstate->format == NULL) {
-		dev_dbg(rcdu->dev, "%s: unsupported format %08x\n", __func__,
+	*format = rcar_du_format_info(state->fb->format->format);
+	if (*format == NULL) {
+		dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
 			state->fb->format->format);
 		return -EINVAL;
 	}
@@ -593,6 +592,14 @@ static int rcar_du_plane_atomic_check(struct drm_plane *plane,
 	return 0;
 }
 
+static int rcar_du_plane_atomic_check(struct drm_plane *plane,
+				      struct drm_plane_state *state)
+{
+	struct rcar_du_plane_state *rstate = to_rcar_plane_state(state);
+
+	return __rcar_du_plane_atomic_check(plane, state, &rstate->format);
+}
+
 static void rcar_du_plane_atomic_update(struct drm_plane *plane,
 					struct drm_plane_state *old_state)
 {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.h b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
index f62e09f195de..890321b4665d 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
@@ -73,6 +73,10 @@ to_rcar_plane_state(struct drm_plane_state *state)
 int rcar_du_atomic_check_planes(struct drm_device *dev,
 				struct drm_atomic_state *state);
 
+int __rcar_du_plane_atomic_check(struct drm_plane *plane,
+				 struct drm_plane_state *state,
+				 const struct rcar_du_format_info **format);
+
 int rcar_du_planes_init(struct rcar_du_group *rgrp);
 
 void __rcar_du_plane_setup(struct rcar_du_group *rgrp,
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index 2c96147bc444..dd66dcb8da23 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -268,28 +268,8 @@ static int rcar_du_vsp_plane_atomic_check(struct drm_plane *plane,
 					  struct drm_plane_state *state)
 {
 	struct rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(state);
-	struct rcar_du_vsp_plane *rplane = to_rcar_vsp_plane(plane);
-	struct rcar_du_device *rcdu = rplane->vsp->dev;
 
-	if (!state->fb || !state->crtc) {
-		rstate->format = NULL;
-		return 0;
-	}
-
-	if (state->src_w >> 16 != state->crtc_w ||
-	    state->src_h >> 16 != state->crtc_h) {
-		dev_dbg(rcdu->dev, "%s: scaling not supported\n", __func__);
-		return -EINVAL;
-	}
-
-	rstate->format = rcar_du_format_info(state->fb->format->format);
-	if (rstate->format == NULL) {
-		dev_dbg(rcdu->dev, "%s: unsupported format %08x\n", __func__,
-			state->fb->format->format);
-		return -EINVAL;
-	}
-
-	return 0;
+	return __rcar_du_plane_atomic_check(plane, state, &rstate->format);
 }
 
 static void rcar_du_vsp_plane_atomic_update(struct drm_plane *plane,