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Sun, 25 Jan 2026 23:47:54 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , <18255117159@163.com> CC: , , , , "Manikanta Maddireddy" Subject: [PATCH V4 22/22] PCI: tegra194: Disable PERST IRQ only in Endpoint mode Date: Mon, 26 Jan 2026 13:15:19 +0530 Message-ID: <20260126074519.3426742-23-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260126074519.3426742-1-mmaddireddy@nvidia.com> References: <20260126074519.3426742-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF00000208:EE_|IA0PPF316EEACD8:EE_ X-MS-Office365-Filtering-Correlation-Id: d3b225c0-85db-46f5-cf23-08de5caf432a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|376014|7416014|921020; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2026 07:48:14.7753 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d3b225c0-85db-46f5-cf23-08de5caf432a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF00000208.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PPF316EEACD8 Content-Type: text/plain; charset="utf-8" The PERST (PERST#) GPIO interrupt is only registered when the controller is operating in Endpoint mode. In Root Port mode, the PERST GPIO is configured as an output to control downstream devices, and no interrupt is registered for it. Currently, tegra_pcie_dw_stop_link() unconditionally calls disable_irq() on pex_rst_irq, which causes issues in Root Port mode where this IRQ is not registered. Fix this by only disabling the PERST IRQ when operating in Endpoint mode, where the interrupt is actually registered and used to detect PERST assertion/deassertion from the host. Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Teg= ra194") Signed-off-by: Manikanta Maddireddy --- V4: * This is a new patch in this series drivers/pci/controller/dwc/pcie-tegra194.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index b0964f57e8f2..553028a161aa 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1060,7 +1060,8 @@ static void tegra_pcie_dw_stop_link(struct dw_pcie *p= ci) { struct tegra_pcie_dw *pcie =3D to_tegra_pcie(pci); =20 - disable_irq(pcie->pex_rst_irq); + if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) + disable_irq(pcie->pex_rst_irq); } =20 static const struct dw_pcie_ops tegra_dw_pcie_ops =3D { --=20 2.34.1