linux-kernel - [PATCH v14 25/34] cxl/port: Map Port component registers before switchport init

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Message-ID: <20260114182055.46029-26-terry.bowman@amd.com>
Date: Wed, 14 Jan 2026 12:20:46 -0600
From: Terry Bowman <terry.bowman@....com>
To: <dave@...olabs.net>, <jonathan.cameron@...wei.com>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <vishal.l.verma@...el.com>, <alucerop@....com>,
	<ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<terry.bowman@....com>
Subject: [PATCH v14 25/34] cxl/port: Map Port component registers before switchport init

Port HDM registers must be mapped before calling
devm_cxl_switch_port_decoders_setup(). Invoke a call to this function
in cxl_port_add_dport().

Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/cxl/core/port.c | 3 ++-
 drivers/cxl/cxlpci.h    | 3 +++
 drivers/cxl/port.c      | 5 +++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 2c4e28e7975c..3f730511f11d 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -778,7 +778,7 @@ static int cxl_setup_comp_regs(struct device *host, struct cxl_register_map *map
 	return cxl_setup_regs(map);
 }
 
-static int cxl_port_setup_regs(struct cxl_port *port,
+int cxl_port_setup_regs(struct cxl_port *port,
 			resource_size_t component_reg_phys)
 {
 	if (dev_is_platform(port->uport_dev))
@@ -786,6 +786,7 @@ static int cxl_port_setup_regs(struct cxl_port *port,
 	return cxl_setup_comp_regs(&port->dev, &port->reg_map,
 				   component_reg_phys);
 }
+EXPORT_SYMBOL_NS_GPL(cxl_port_setup_regs, "CXL");
 
 static int cxl_dport_setup_regs(struct device *host, struct cxl_dport *dport,
 				resource_size_t component_reg_phys)
diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
index ef4496b4e55e..532506595d0f 100644
--- a/drivers/cxl/cxlpci.h
+++ b/drivers/cxl/cxlpci.h
@@ -99,4 +99,7 @@ static inline void devm_cxl_port_ras_setup(struct cxl_port *port)
 }
 #endif
 
+int cxl_port_setup_regs(struct cxl_port *port,
+			resource_size_t component_reg_phys);
+
 #endif /* __CXL_PCI_H__ */
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index d76b4b532064..f8a33dbf8222 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -278,6 +278,11 @@ static struct cxl_dport *cxl_port_add_dport(struct cxl_port *port,
 		return ERR_CAST(port_group);
 
 	if (port->nr_dports == 0) {
+
+		rc = cxl_port_setup_regs(port, port->component_reg_phys);
+		if (rc)
+			return ERR_PTR(rc);
+
 		rc = devm_cxl_switch_port_decoders_setup(port);
 		if (rc)
 			return ERR_PTR(rc);
-- 
2.34.1