linux-kernel - [PATCH 3/3] PCI: of: Relax max-link-speed check to support PCIe Gen5/Gen6

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Message-Id: <20250519160448.209461-4-18255117159@163.com>
Date: Tue, 20 May 2025 00:04:48 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	krzk+dt@...nel.org,
	manivannan.sadhasivam@...aro.org,
	conor+dt@...nel.org
Cc: robh@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH 3/3] PCI: of: Relax max-link-speed check to support PCIe Gen5/Gen6

The existing code restricted `max-link-speed` to values 1~4 (Gen1~Gen4),
but current SOCs using Synopsys/Cadence IP may require Gen5/Gen6 support.
This patch updates the validation in `of_pci_get_max_link_speed` to allow
values up to 6, ensuring compatibility with newer PCIe generations.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 drivers/pci/of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index ab7a8252bf41..379d90913937 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -890,7 +890,7 @@ int of_pci_get_max_link_speed(struct device_node *node)
 	u32 max_link_speed;
 
 	if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
-	    max_link_speed == 0 || max_link_speed > 4)
+	    max_link_speed == 0 || max_link_speed > 6)
 		return -EINVAL;
 
 	return max_link_speed;
-- 
2.25.1