diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 39e2cc5..5881fad 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -28,6 +28,12 @@
 #define EDID_LENGTH 128
 #define DDC_ADDR 0x50
 
+#define CEA_EXT	    0x02
+#define VTB_EXT	    0x10
+#define DI_EXT	    0x40
+#define LS_EXT	    0x50
+#define MI_EXT	    0x60
+
 struct est_timings {
 	u8 t1;
 	u8 t2;