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Signed-off-by: Sai Krishna Musham --- Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml index 43dc2585c237..e6117d326279 100644 --- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml +++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml @@ -87,6 +87,7 @@ examples: - | #include #include + #include soc { #address-cells = <2>; @@ -112,6 +113,7 @@ examples: #size-cells = <2>; #interrupt-cells = <1>; device_type = "pci"; + reset-gpios = <&tca6416_u37 7 GPIO_ACTIVE_LOW>; pcie_intc_0: interrupt-controller { #address-cells = <0>; #interrupt-cells = <1>; From patchwork Wed Mar 26 04:15:07 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Musham, Sai Krishna" X-Patchwork-Id: 14029716 X-Patchwork-Delegate: kw@linux.com Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2078.outbound.protection.outlook.com [40.107.237.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8265B18C034; 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Signed-off-by: Sai Krishna Musham --- drivers/pci/controller/dwc/pcie-amd-mdb.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-amd-mdb.c b/drivers/pci/controller/dwc/pcie-amd-mdb.c index 4eb2a4e8189d..4eea53e9e197 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 +#include "../../pci.h" #include "pcie-designware.h" #define AMD_MDB_TLP_IR_STATUS_MISC 0x4C0 @@ -408,6 +409,7 @@ static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *pcie, struct dw_pcie *pci = &pcie->pci; struct dw_pcie_rp *pp = &pci->pp; struct device *dev = &pdev->dev; + struct gpio_desc *reset_gpio; int err; pcie->slcr = devm_platform_ioremap_resource_byname(pdev, "slcr"); @@ -426,6 +428,24 @@ static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *pcie, pp->ops = &amd_mdb_pcie_host_ops; + /* Request the GPIO for PCIe reset signal and assert */ + reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpio)) { + if (PTR_ERR(reset_gpio) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_err(dev, "Failed to request reset GPIO\n"); + return PTR_ERR(reset_gpio); + } + + if (reset_gpio) { + /* Controller specific delay */ + udelay(50); + + /* Deassert the reset signal */ + gpiod_set_value_cansleep(reset_gpio, 0); + mdelay(PCIE_T_RRS_READY_MS); + } + err = dw_pcie_host_init(pp); if (err) { dev_err(dev, "Failed to initialize host, err=%d\n", err);