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Mon, 2 Mar 2026 22:55:36 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v7 04/13] PCI: tegra194: Disable PERST IRQ only in Endpoint mode Date: Tue, 3 Mar 2026 12:24:39 +0530 Message-ID: <20260303065448.2361488-5-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260303065448.2361488-1-mmaddireddy@nvidia.com> References: <20260303065448.2361488-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF00004FBB:EE_|CYXPR12MB9386:EE_ X-MS-Office365-Filtering-Correlation-Id: 73d78240-38f5-4131-06c5-08de78f1eb3c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014|7416014|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014)(7416014)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Sq3lXjCErnXJRuuAl3P4/p8v173SsY9S5ONYnXfb4FjcqeP3YcV2urJFu37NAU3ROn2GIhuQMhl9jfRjQn6N8d1ilrKOVeEaEDpW3sxGxLj4zaIrAMX0Cze04CVuW2XtKKXkpofLUvOG04sGWxG3jZpKQA9k8Z8Xl0tiHf942Te/EE84aJOTpRB3kUdih4hQw/l98dNmeOZKfa/kcD2C8jGGOkGMmCM9kSa7WUtFhiBUTzrT3s20ED+E8paOw0T/BmY/9ktOa/eO8UslNtXe36r3X+Xo4elE3Juz8guyCbsAwCFRe+qtF6JDks3HlKfpgh2Tk/hgb3VkMbw9N6GqEZwRxtl4LaS+C28Q/vOH0znhJFH3/Yszi2LL0Ew62tqR3xD6b946RNi8AApyLTNRHLAsUtkwUsILRYbSk1CtFvumdRDXJa5b6QPUB1LqB5FU X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Mar 2026 06:55:55.9365 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 73d78240-38f5-4131-06c5-08de78f1eb3c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF00004FBB.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYXPR12MB9386 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 Tegra194") Reviewed-by: Jon Hunter Tested-by: Jon Hunter Reviewed-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- Changes V1 -> V7: None 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/controller/dwc/pcie-tegra194.c index 831986de584e..dd8b92fbd393 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1025,7 +1025,8 @@ static void tegra_pcie_dw_stop_link(struct dw_pcie *pci) { struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); - disable_irq(pcie->pex_rst_irq); + if (pcie->of_data->mode == DW_PCIE_EP_TYPE) + disable_irq(pcie->pex_rst_irq); } static const struct dw_pcie_ops tegra_dw_pcie_ops = { -- 2.34.1