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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by BL6PEPF0001AB59.mail.protection.outlook.com (10.167.241.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9654.16 via Frontend Transport; Tue, 3 Mar 2026 06:56:11 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 2 Mar 2026 22:55:57 -0800 Received: from mmaddireddy-ubuntu.nvidia.com (10.126.231.35) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 2 Mar 2026 22:55:50 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v7 06/13] PCI: tegra194: Disable direct speed change for EP Date: Tue, 3 Mar 2026 12:24:41 +0530 Message-ID: <20260303065448.2361488-7-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-kernel@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: BL6PEPF0001AB59:EE_|DM4PR12MB8522:EE_ X-MS-Office365-Filtering-Correlation-Id: 1c7b1c6c-8d40-436f-726c-08de78f1f4bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|7416014|376014|921020; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: qTR/sUEsJiPd5FJbdipLCHvclE+FOXTXfzLuH72qacy7rpQxMQU8Rqn9rNOFEEW37wlcQiDlBoJtWQpdhUPcsOLJu4pqr54/nCkI5mSrGPL783ZAr/PKp0Ue7ChU65d3Gr5kzW/AvYm7c2bL7GcuV31rnfQ/aopF4O49TdMeIytv4/qQys3ykXvSTaAsqkaDCZMJFm7AEYyaLyNOi8L1HO5DQCPsKjmxfQugMqYX4YTsnikDFlKhE9BnSD3egLTfxxmZXFYI5K0Ah/9NBPM8jD8t72WqmFIKpxhaiVnQ6F+uh/LOCQDIRnm9/DKKJy69938y1KOo1LT4AaFZr0WtxkliJdcp9y0rZ1UXy9iGYEqtYOlDmE0a3WBGpLBOcU0fQ79A66H6j31UMV5mB0G9SJMRp2T8n5T9ctAlD9LioF8gnCI3kqWsJ9VBKeXBcHBH X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Mar 2026 06:56:11.9244 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1c7b1c6c-8d40-436f-726c-08de78f1f4bc 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: BL6PEPF0001AB59.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB8522 From: Vidya Sagar Disable direct speed change for the Endpoint to prevent it from initiating the speed change post physical layer link up at gen1. This leaves the speed change ownership with the host. Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Tegra194") Reviewed-by: Jon Hunter Tested-by: Jon Hunter Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- Changes V1 -> V7: None drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 7dcf3e3596dd..2da3478f0b5f 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1805,6 +1805,10 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) reset_control_deassert(pcie->core_rst); + val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); + val &= ~PORT_LOGIC_SPEED_CHANGE; + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + if (pcie->update_fc_fixup) { val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; -- 2.34.1