diff --git a/target/linux/ar71xx/patches-4.14/952-qca955x-enable-ddr-wb-flush.patch b/target/linux/ar71xx/patches-4.14/952-qca955x-enable-ddr-wb-flush.patch
new file mode 100644
index 00000000000..ef22edb319c
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.14/952-qca955x-enable-ddr-wb-flush.patch
@@ -0,0 +1,49 @@
+--- a/arch/mips/ath79/common.c
++++ b/arch/mips/ath79/common.c
+@@ -49,6 +49,8 @@ void ath79_ddr_ctrl_init(void)
+ 	if (soc_is_ar913x() || soc_is_ar724x() || soc_is_ar933x()) {
+ 		ath79_ddr_wb_flush_base = ath79_ddr_base + 0x7c;
+ 		ath79_ddr_pci_win_base = 0;
++	} else if (soc_is_qca953x() || soc_is_qca955x()) {
++		ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
+ 	} else {
+ 		ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
+ 		ath79_ddr_pci_win_base = ath79_ddr_base + 0x7c;
+--- a/arch/mips/ath79/irq.c
++++ b/arch/mips/ath79/irq.c
+@@ -99,12 +99,12 @@ static void qca955x_ip2_irq_dispatch(str
+ 	}
+ 
+ 	if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
+-		/* TODO: flush DDR? */
++		ath79_ddr_wb_flush(3);
+ 		generic_handle_irq(ATH79_IP2_IRQ(0));
+ 	}
+ 
+ 	if (status & QCA955X_EXT_INT_WMAC_ALL) {
+-		/* TODO: flush DDR? */
++		ath79_ddr_wb_flush(4);
+ 		generic_handle_irq(ATH79_IP2_IRQ(1));
+ 	}
+ }
+@@ -124,17 +124,17 @@ static void qca955x_ip3_irq_dispatch(str
+ 	}
+ 
+ 	if (status & QCA955X_EXT_INT_USB1) {
+-		/* TODO: flush DDR? */
++		ath79_ddr_wb_flush(2);
+ 		generic_handle_irq(ATH79_IP3_IRQ(0));
+ 	}
+ 
+ 	if (status & QCA955X_EXT_INT_USB2) {
+-		/* TODO: flush DDR? */
++		ath79_ddr_wb_flush(2);
+ 		generic_handle_irq(ATH79_IP3_IRQ(1));
+ 	}
+ 
+ 	if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
+-		/* TODO: flush DDR? */
++		ath79_ddr_wb_flush(3);
+ 		generic_handle_irq(ATH79_IP3_IRQ(2));
+ 	}
+ }