diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 1a3f8729a616..618865ca6a9f 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -939,8 +939,9 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
 		return ERR_PTR(-ENOMEM);
 
 	if (rcrb != CXL_RESOURCE_NONE) {
-		component_reg_phys = cxl_rcrb_to_component(dport_dev,
-						rcrb, CXL_RCRB_DOWNSTREAM);
+		component_reg_phys =
+			cxl_probe_rcrb(dport_dev, rcrb, &dport->rcrb,
+				       CXL_RCRB_DOWNSTREAM);
 		if (component_reg_phys == CXL_RESOURCE_NONE) {
 			dev_warn(dport_dev, "Invalid Component Registers in RCRB");
 			return ERR_PTR(-ENXIO);
@@ -957,7 +958,7 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
 	dport->port_id = port_id;
 	dport->component_reg_phys = component_reg_phys;
 	dport->port = port;
-	dport->rcrb = rcrb;
+	dport->rcrb.base = rcrb;
 
 	cond_cxl_root_lock(port);
 	rc = add_dport(port, dport);
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index 1476a0299c9b..08da4c917f99 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -332,9 +332,8 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
 }
 EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, CXL);
 
-resource_size_t cxl_rcrb_to_component(struct device *dev,
-				      resource_size_t rcrb,
-				      enum cxl_rcrb which)
+resource_size_t cxl_probe_rcrb(struct device *dev, resource_size_t rcrb,
+			       struct cxl_rcrb_info *ri, enum cxl_rcrb which)
 {
 	resource_size_t component_reg_phys;
 	void __iomem *addr;
@@ -344,6 +343,8 @@ resource_size_t cxl_rcrb_to_component(struct device *dev,
 
 	if (which == CXL_RCRB_UPSTREAM)
 		rcrb += SZ_4K;
+	else if (ri)
+		ri->base = rcrb;
 
 	/*
 	 * RCRB's BAR[0..1] point to component block containing CXL
@@ -364,6 +365,7 @@ resource_size_t cxl_rcrb_to_component(struct device *dev,
 	cmd = readw(addr + PCI_COMMAND);
 	bar0 = readl(addr + PCI_BASE_ADDRESS_0);
 	bar1 = readl(addr + PCI_BASE_ADDRESS_1);
+
 	iounmap(addr);
 	release_mem_region(rcrb, SZ_4K);
 
@@ -395,4 +397,4 @@ resource_size_t cxl_rcrb_to_component(struct device *dev,
 
 	return component_reg_phys;
 }
-EXPORT_SYMBOL_NS_GPL(cxl_rcrb_to_component, CXL);
+EXPORT_SYMBOL_NS_GPL(cxl_probe_rcrb, CXL);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index a5cd661face2..29e0bd2b8f2a 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -267,9 +267,9 @@ enum cxl_rcrb {
 	CXL_RCRB_DOWNSTREAM,
 	CXL_RCRB_UPSTREAM,
 };
-resource_size_t cxl_rcrb_to_component(struct device *dev,
-				      resource_size_t rcrb,
-				      enum cxl_rcrb which);
+struct cxl_rcrb_info;
+resource_size_t cxl_probe_rcrb(struct device *dev, resource_size_t rcrb,
+			       struct cxl_rcrb_info *ri, enum cxl_rcrb which);
 
 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
 #define CXL_TARGET_STRLEN 20
@@ -587,22 +587,27 @@ cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev)
 	return xa_load(&port->dports, (unsigned long)dport_dev);
 }
 
+struct cxl_rcrb_info {
+	resource_size_t base;
+	u16 aer_cap;
+};
+
 /**
  * struct cxl_dport - CXL downstream port
  * @dport: PCI bridge or firmware device representing the downstream link
+ * @port: reference to cxl_port that contains this downstream port
  * @port_id: unique hardware identifier for dport in decoder target list
  * @component_reg_phys: downstream port component registers
- * @rcrb: base address for the Root Complex Register Block
  * @rch: Indicate whether this dport was enumerated in RCH or VH mode
- * @port: reference to cxl_port that contains this downstream port
+ * @rcrb: Data about the Root Complex Register Block layout
  */
 struct cxl_dport {
 	struct device *dport;
+	struct cxl_port *port;
 	int port_id;
 	resource_size_t component_reg_phys;
-	resource_size_t rcrb;
 	bool rch;
-	struct cxl_port *port;
+	struct cxl_rcrb_info rcrb;
 };
 
 /**
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 519edd0eb196..7ecdaa7f9315 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -51,7 +51,6 @@ static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd,
 	struct cxl_port *parent_port = parent_dport->port;
 	struct cxl_dev_state *cxlds = cxlmd->cxlds;
 	struct cxl_port *endpoint, *iter, *down;
-	resource_size_t component_reg_phys;
 	int rc;
 
 	/*
@@ -71,12 +70,15 @@ static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd,
 	 * host-bridge RCRB if they are not already mapped via the
 	 * typical register locator mechanism.
 	 */
-	if (parent_dport->rch && cxlds->component_reg_phys == CXL_RESOURCE_NONE)
-		component_reg_phys = cxl_rcrb_to_component(
-			&cxlmd->dev, parent_dport->rcrb, CXL_RCRB_UPSTREAM);
-	else
-		component_reg_phys = cxlds->component_reg_phys;
-	endpoint = devm_cxl_add_port(host, &cxlmd->dev, component_reg_phys,
+	if (parent_dport->rch &&
+	    cxlds->component_reg_phys == CXL_RESOURCE_NONE) {
+		cxlds->component_reg_phys =
+			cxl_probe_rcrb(&cxlmd->dev, parent_dport->rcrb.base,
+				       NULL, CXL_RCRB_UPSTREAM);
+	}
+
+	endpoint = devm_cxl_add_port(host, &cxlmd->dev,
+				     cxlds->component_reg_phys,
 				     parent_dport);
 	if (IS_ERR(endpoint))
 		return PTR_ERR(endpoint);
diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index 6f9347ade82c..32b9d398d399 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -12,7 +12,7 @@ ldflags-y += --wrap=devm_cxl_enumerate_decoders
 ldflags-y += --wrap=cxl_await_media_ready
 ldflags-y += --wrap=cxl_hdm_decode_init
 ldflags-y += --wrap=cxl_dvsec_rr_decode
-ldflags-y += --wrap=cxl_rcrb_to_component
+ldflags-y += --wrap=cxl_probe_rcrb
 
 DRIVERS := ../../../drivers
 CXL_SRC := $(DRIVERS)/cxl
diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index bf00dc52fe96..790dec597a70 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -971,12 +971,14 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 	return 0;
 }
 
-resource_size_t mock_cxl_rcrb_to_component(struct device *dev,
-					   resource_size_t rcrb,
-					   enum cxl_rcrb which)
+resource_size_t mock_cxl_probe_rcrb(struct device *dev, resource_size_t rcrb,
+				    struct cxl_rcrb_info *ri, enum cxl_rcrb which)
 {
 	dev_dbg(dev, "rcrb: %pa which: %d\n", &rcrb, which);
 
+	if (which == CXL_RCRB_DOWNSTREAM)
+		ri->base = rcrb;
+
 	return (resource_size_t) which + 1;
 }
 
@@ -988,7 +990,7 @@ static struct cxl_mock_ops cxl_mock_ops = {
 	.is_mock_dev = is_mock_dev,
 	.acpi_table_parse_cedt = mock_acpi_table_parse_cedt,
 	.acpi_evaluate_integer = mock_acpi_evaluate_integer,
-	.cxl_rcrb_to_component = mock_cxl_rcrb_to_component,
+	.cxl_probe_rcrb = mock_cxl_probe_rcrb,
 	.acpi_pci_find_root = mock_acpi_pci_find_root,
 	.devm_cxl_port_enumerate_dports = mock_cxl_port_enumerate_dports,
 	.devm_cxl_setup_hdm = mock_cxl_setup_hdm,
diff --git a/tools/testing/cxl/test/mock.c b/tools/testing/cxl/test/mock.c
index 284416527644..4790055fe25a 100644
--- a/tools/testing/cxl/test/mock.c
+++ b/tools/testing/cxl/test/mock.c
@@ -259,9 +259,9 @@ int __wrap_cxl_dvsec_rr_decode(struct device *dev, int dvsec,
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_cxl_dvsec_rr_decode, CXL);
 
-resource_size_t __wrap_cxl_rcrb_to_component(struct device *dev,
-					     resource_size_t rcrb,
-					     enum cxl_rcrb which)
+resource_size_t __wrap_cxl_probe_rcrb(struct device *dev, resource_size_t rcrb,
+				      struct cxl_rcrb_info *ri,
+				      enum cxl_rcrb which)
 {
 	int index;
 	resource_size_t component_reg_phys;
@@ -269,14 +269,14 @@ resource_size_t __wrap_cxl_rcrb_to_component(struct device *dev,
 
 	if (ops && ops->is_mock_port(dev))
 		component_reg_phys =
-			ops->cxl_rcrb_to_component(dev, rcrb, which);
+			ops->cxl_probe_rcrb(dev, rcrb, ri, which);
 	else
-		component_reg_phys = cxl_rcrb_to_component(dev, rcrb, which);
+		component_reg_phys = cxl_probe_rcrb(dev, rcrb, ri, which);
 	put_cxl_mock_ops(index);
 
 	return component_reg_phys;
 }
-EXPORT_SYMBOL_NS_GPL(__wrap_cxl_rcrb_to_component, CXL);
+EXPORT_SYMBOL_NS_GPL(__wrap_cxl_probe_rcrb, CXL);
 
 MODULE_LICENSE("GPL v2");
 MODULE_IMPORT_NS(ACPI);
diff --git a/tools/testing/cxl/test/mock.h b/tools/testing/cxl/test/mock.h
index bef8817b01f2..7ef21356d052 100644
--- a/tools/testing/cxl/test/mock.h
+++ b/tools/testing/cxl/test/mock.h
@@ -15,9 +15,10 @@ struct cxl_mock_ops {
 					     acpi_string pathname,
 					     struct acpi_object_list *arguments,
 					     unsigned long long *data);
-	resource_size_t (*cxl_rcrb_to_component)(struct device *dev,
-						 resource_size_t rcrb,
-						 enum cxl_rcrb which);
+	resource_size_t (*cxl_probe_rcrb)(struct device *dev,
+					  resource_size_t rcrb,
+					  struct cxl_rcrb_info *ri,
+					  enum cxl_rcrb which);
 	struct acpi_pci_root *(*acpi_pci_find_root)(acpi_handle handle);
 	bool (*is_mock_bus)(struct pci_bus *bus);
 	bool (*is_mock_port)(struct device *dev);
