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Sun, 25 Jan 2026 23:46:25 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , <18255117159@163.com> CC: , , , , "Manikanta Maddireddy" Subject: [PATCH V4 07/22] PCI: tegra194: Calibrate P2U for endpoint mode Date: Mon, 26 Jan 2026 13:15:04 +0530 Message-ID: <20260126074519.3426742-8-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: SJ1PEPF000023CE:EE_|MN2PR12MB4285:EE_ X-MS-Office365-Filtering-Correlation-Id: ce711033-8640-478d-472e-08de5caf0c6b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024|921020; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2026 07:46:43.0167 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ce711033-8640-478d-472e-08de5caf0c6b 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: SJ1PEPF000023CE.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4285 Content-Type: text/plain; charset="utf-8" From: Vidya Sagar Calibrate P2U for endpoint controller to request UPHY PLL rate change to Gen1 during initialization. This helps to reset stale PLL state from the previous bad link state. Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- V4: * None V3: * Reworded the commit message V2: * None drivers/pci/controller/dwc/pcie-tegra194.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 25f933a578ae..f69bc416b031 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1065,6 +1065,9 @@ static int tegra_pcie_enable_phy(struct tegra_pcie_dw= *pcie) ret =3D phy_power_on(pcie->phys[i]); if (ret < 0) goto phy_exit; + + if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) + phy_calibrate(pcie->phys[i]); } =20 return 0; --=20 2.34.1