diff --git a/hw/xfree86/ddc/edid.h b/hw/xfree86/ddc/edid.h
index adc9bf71c9..3845ecc32f 100644
--- a/hw/xfree86/ddc/edid.h
+++ b/hw/xfree86/ddc/edid.h
@@ -12,6 +12,7 @@
 #ifndef _EDID_H_
 #define _EDID_H_
 
+#include <stdbool.h>
 #include <X11/Xmd.h>
 
 #ifndef _X_EXPORT
@@ -668,4 +669,12 @@ struct cea_ext_body {
     struct cea_data_block data_collection;
 };
 
+/*
+ * check whether monitor supports Generalized Timing Formula
+ *
+ * @param  monitor the monitor information structure to check
+ * @return true if GTF is supported by the monitor
+ */
+_X_EXPORT bool xf86Monitor_gtf_supported(xf86MonPtr monitor);
+
 #endif                          /* _EDID_H_ */
diff --git a/hw/xfree86/ddc/interpret_edid.c b/hw/xfree86/ddc/interpret_edid.c
index 5e48919724..808cabed44 100644
--- a/hw/xfree86/ddc/interpret_edid.c
+++ b/hw/xfree86/ddc/interpret_edid.c
@@ -777,3 +777,11 @@ gtf_supported(xf86MonPtr mon)
 
     return FALSE;
 }
+
+bool xf86Monitor_gtf_supported(xf86MonPtr monitor)
+{
+    if (!monitor)
+        return false;
+
+    return GTF_SUPPORTED(monitor->features.msc);
+}