diff --git a/drmdisplaycomposition.cpp b/drmdisplaycomposition.cpp
index 457fb5a..d47b5dc 100644
--- a/drmdisplaycomposition.cpp
+++ b/drmdisplaycomposition.cpp
@@ -231,6 +231,15 @@
   return 0;
 }
 
+int DrmDisplayComposition::SetDisplayMode(const DrmMode &display_mode) {
+  if (!validate_composition_type(DRM_COMPOSITION_TYPE_MODESET))
+    return -EINVAL;
+  display_mode_ = display_mode;
+  dpms_mode_ = DRM_MODE_DPMS_ON;
+  type_ = DRM_COMPOSITION_TYPE_MODESET;
+  return 0;
+}
+
 int DrmDisplayComposition::AddPlaneDisable(DrmPlane *plane) {
   layers_.emplace_back();
   DrmCompositionLayer &c_layer = layers_.back();
@@ -271,6 +280,10 @@
   return frame_no_;
 }
 
+const DrmMode &DrmDisplayComposition::display_mode() const {
+  return display_mode_;
+}
+
 Importer *DrmDisplayComposition::importer() const {
   return importer_;
 }