--- a/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
+++ b/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
@@ -543,3 +543,7 @@
 		};
 	};
 };
+
+&coherencyfab {
+	broken-idle;
+};