diff --git a/target/linux/mvebu/patches-4.14/230-armada-xp-linksys-mamba-broken-idle.patch b/target/linux/mvebu/patches-4.14/230-armada-xp-linksys-mamba-broken-idle.patch
new file mode 100644
index 0000000000..e82a899a75
--- /dev/null
+++ b/target/linux/mvebu/patches-4.14/230-armada-xp-linksys-mamba-broken-idle.patch
@@ -0,0 +1,10 @@
+--- a/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
++++ b/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
+@@ -563,3 +563,7 @@
+ 		};
+ 	};
+ };
++
++&coherencyfab {
++	broken-idle;
++};