diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index acd50920c2ff..c4401d869939 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -277,6 +277,10 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
 
+	/* Rely on the external MSI domain */
+	if (pp->msi_ext)
+		return 0;
+
 	pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
 					       &dw_pcie_msi_domain_ops, pp);
 	if (!pp->irq_domain) {
@@ -298,6 +302,9 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 
 void dw_pcie_free_msi(struct pcie_port *pp)
 {
+	if (pp->msi_ext)
+		return;
+
 	irq_set_chained_handler(pp->msi_irq, NULL);
 	irq_set_handler_data(pp->msi_irq, NULL);
 
@@ -443,7 +450,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	if (ret)
 		pci->num_viewport = 2;
 
-	if (pci_msi_enabled()) {
+	if (pci_msi_enabled() &&
+	    !pp->msi_ext) {
 		/*
 		 * If a specific SoC driver needs to change the
 		 * default number of vectors, it needs to implement
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 14dcf6646699..ba2740752e01 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -168,6 +168,7 @@ struct pcie_port {
 	u32			num_vectors;
 	u32			irq_status[MAX_MSI_CTRLS];
 	raw_spinlock_t		lock;
+	int			msi_ext;
 	DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
 };