diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 21881fb5e84a..8c2719efda2a 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -405,8 +405,8 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 
 	format = rcar_du_format_info(mode_cmd->pixel_format);
 	if (format == NULL) {
-		dev_dbg(dev->dev, "unsupported pixel format %08x\n",
-			mode_cmd->pixel_format);
+		dev_dbg(dev->dev, "unsupported pixel format %p4cc\n",
+			&mode_cmd->pixel_format);
 		return ERR_PTR(-EINVAL);
 	}
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
index 3772dcc19a5a..d759e0192181 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
@@ -625,8 +625,8 @@ int __rcar_du_plane_atomic_check(struct drm_plane *plane,
 
 	*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);
+		dev_dbg(dev->dev, "%s: unsupported format %p4cc\n", __func__,
+			&state->fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
index 25f50a297c11..8cd37d7b8ae2 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
@@ -166,8 +166,8 @@ static int rcar_du_wb_enc_atomic_check(struct drm_encoder *encoder,
 
 	wb_state->format = rcar_du_format_info(fb->format->format);
 	if (wb_state->format == NULL) {
-		dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
-			fb->format->format);
+		dev_dbg(dev->dev, "%s: unsupported format %p4cc\n", __func__,
+			&fb->format->format);
 		return -EINVAL;
 	}