diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index c49c8b5b480084dc0ba12b7b27f7d68c6353e4f9..e7b9a7d7c9a26d4d1aff0f12a2f510ef95342cf0 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -366,7 +366,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 
 void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 				  int type, u64 cpu_addr, u64 pci_addr,
-				  u32 size)
+				  u64 size)
 {
 	__dw_pcie_prog_outbound_atu(pci, func_no, index, type,
 				    cpu_addr, pci_addr, size);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 5d979953800dfb7455ddcd03734930151e549ea4..d8d2e0a7ac0918361cb63b371e428f5dbb82a56d 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -298,7 +298,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
 			       u64 size);
 void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 				  int type, u64 cpu_addr, u64 pci_addr,
-				  u32 size);
+				  u64 size);
 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 			     int bar, u64 cpu_addr,
 			     enum dw_pcie_as_type as_type);