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PCI: amd-mdb: Assert PERST# on shutdown

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Add a shutdown handler for the AMD MDB PCIe host controller that
asserts the PERST# signal via GPIO before the system powers off or
reboots. This ensures the connected PCIe endpoint is held in reset
during shutdown.

Signed-off-by: Sai Krishna Musham <sai.krishna.musham@amd.com>
[mani: removed conditional check since GPIO APIs return safely if desc is NULL]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20260427121227.290604-1-sai.krishna.musham@amd.com
This commit is contained in:
Sai Krishna Musham 2026-04-27 17:42:27 +05:30 committed by Manivannan Sadhasivam
parent 254f49634e
commit 0492461a05
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/controller/dwc/pcie-amd-mdb.c
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@ -507,6 +507,13 @@ static int amd_mdb_pcie_probe(struct platform_device *pdev)
return amd_mdb_add_pcie_port(pcie, pdev);
}
static void amd_mdb_pcie_shutdown(struct platform_device *pdev)
{
struct amd_mdb_pcie *pcie = platform_get_drvdata(pdev);
gpiod_set_value_cansleep(pcie->perst_gpio, 1);
}
static const struct of_device_id amd_mdb_pcie_of_match[] = {
{
.compatible = "amd,versal2-mdb-host",
@ -521,6 +528,7 @@ static struct platform_driver amd_mdb_pcie_driver = {
.suppress_bind_attrs = true,
},
.probe = amd_mdb_pcie_probe,
.shutdown = amd_mdb_pcie_shutdown,
};
builtin_platform_driver(amd_mdb_pcie_driver);