diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index 3514f230d315..30104912e249 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -313,6 +313,9 @@ static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 		break;
 	}
 
+	if (!IS_ALIGNED(mode->hdisplay * bpc * 3, 32))
+		return MODE_H_ILLEGAL;
+
 	requested = mode->clock * bpc * 3 / 1000;
 
 	source_max = dp->lanes;