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Mon, 23 Feb 2026 10:42:51 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v6 06/13] PCI: tegra194: Disable direct speed change for EP Date: Tue, 24 Feb 2026 00:11:44 +0530 Message-ID: <20260223184151.3083221-7-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260223184151.3083221-1-mmaddireddy@nvidia.com> References: <20260223184151.3083221-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-pci@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: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023D3:EE_|DS0PR12MB7748:EE_ X-MS-Office365-Filtering-Correlation-Id: 7650e2bd-e66f-4cac-6960-08de730b6e73 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|82310400026|1800799024|921020; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: a6jkqDs3h8gtlNyfeKscCn649Xy4NOKq+PCUS2KjdfajevGBSZlRvxAiQYQDIm8x5sBkJkt1xIS4i0plf/TJD59p1SNqQ5VWITvyEyF2588ufUuObrxUtVnAD5xiX7MuNUf4nOuA6ingICPs4Z+pYvB0Ragw9LUMKx/5unrYtC9kRGfz0stCN0ScesOpOAvOhgdwJoWGs7yZmT38fgEtkpbj/9LArjoGuziXRF55VxVtotVK+2aKsUtToC1cGYaNvWhRnFIWLiqFeSmacKi3Gvlz4dPOoHDMLeCdqcXYiyLr/v7tTd/MsqAylmpgdEf6PftShQjQIIjZTRjQcx96DWgsWQchnZdog3tIsM0iBdY+qO5kvBOhfTqh1zOMDxJJLyHxQzz3xEASL+wxndtJn2eDo1pJwkSPZdR41lq5S5ZDpN8hRRVsxMA50t55KNSY X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Feb 2026 18:43:26.6639 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7650e2bd-e66f-4cac-6960-08de730b6e73 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: SJ1PEPF000023D3.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7748 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") Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- Changes V1 -> V6: 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 8f69c5c5a099..a6868b77e3b7 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1807,6 +1807,10 @@ 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