--- 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
@@ -105,12 +105,12 @@ 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));
 	}
 }
@@ -130,17 +130,17 @@ 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));
 	}
 }