[PATCH v8 3/5] PCI: j721e: Validate max-link-speed from DT
From: Hans Zhang <18255117159@163.com>
Date: 2026-03-12 16:38:22
Also in:
linux-arm-msm, linux-mediatek, linux-omap, linux-pci, linux-renesas-soc, linux-tegra, lkml
Subsystem:
pci driver for cadence pcie ip, pci driver for ti dra7xx/j721e, pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Vignesh Raghavendra, Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
Use the new pcie_get_link_speed() helper to validate the value read from the "max-link-speed" DT property. If the value is missing or invalid, fall back to Gen2 (speed = 2). This prepares for the removal of the range check in of_pci_get_max_link_speed(). Signed-off-by: Hans Zhang <18255117159@163.com> --- drivers/pci/controller/cadence/pci-j721e.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 6f2501479c70..bfdfe98d5aba 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c@@ -202,7 +202,8 @@ static int j721e_pcie_set_link_speed(struct j721e_pcie *pcie, int ret; link_speed = of_pci_get_max_link_speed(np); - if (link_speed < 2) + if ((link_speed < 2) || + (pcie_get_link_speed(link_speed) == PCI_SPEED_UNKNOWN)) link_speed = 2; val = link_speed - 1;
--
2.34.1