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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Apr 2025 09:01:05.6342 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 11affb38-426d-490c-f023-08dd86fc5ffc X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A1.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8328 Content-Type: text/plain; charset="utf-8" Add GPIO based PERST# signal handling for AMD Versal Gen 2 MDB PCIe Root Port. Signed-off-by: Sai Krishna Musham --- Changes in v2: - Change delay to PCIE_T_PVPERL_MS --- drivers/pci/controller/dwc/pcie-amd-mdb.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-amd-mdb.c b/drivers/pci/contro= ller/dwc/pcie-amd-mdb.c index 4eb2a4e8189d..763265e86db5 100644 --- a/drivers/pci/controller/dwc/pcie-amd-mdb.c +++ b/drivers/pci/controller/dwc/pcie-amd-mdb.c @@ -18,6 +18,7 @@ #include #include =20 +#include "../../pci.h" #include "pcie-designware.h" =20 #define AMD_MDB_TLP_IR_STATUS_MISC 0x4C0 @@ -408,6 +409,7 @@ static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *p= cie, struct dw_pcie *pci =3D &pcie->pci; struct dw_pcie_rp *pp =3D &pci->pp; struct device *dev =3D &pdev->dev; + struct gpio_desc *reset_gpio; int err; =20 pcie->slcr =3D devm_platform_ioremap_resource_byname(pdev, "slcr"); @@ -426,6 +428,20 @@ static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *= pcie, =20 pp->ops =3D &amd_mdb_pcie_host_ops; =20 + /* Request the GPIO for PCIe reset signal and assert */ + reset_gpio =3D devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpio)) + return dev_err_probe(dev, PTR_ERR(reset_gpio), + "Failed to request reset GPIO\n"); + + if (reset_gpio) { + mdelay(PCIE_T_PVPERL_MS); + + /* Deassert the reset signal */ + gpiod_set_value_cansleep(reset_gpio, 0); + mdelay(PCIE_T_RRS_READY_MS); + } + err =3D dw_pcie_host_init(pp); if (err) { dev_err(dev, "Failed to initialize host, err=3D%d\n", err); --=20 2.44.1