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Sun, 25 Jan 2026 23:46:55 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , <18255117159@163.com> CC: , , , , "Manikanta Maddireddy" Subject: [PATCH V4 12/22] PCI: tegra194: Allow system suspend when the Endpoint link is not up Date: Mon, 26 Jan 2026 13:15:09 +0530 Message-ID: <20260126074519.3426742-13-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: SJ5PEPF00000204:EE_|DM4PR12MB5914:EE_ X-MS-Office365-Filtering-Correlation-Id: 59da9173-b398-44c1-e5c0-08de5caf214e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700013|1800799024|82310400026|921020; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2026 07:47:17.9687 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 59da9173-b398-44c1-e5c0-08de5caf214e 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: SJ5PEPF00000204.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5914 Content-Type: text/plain; charset="utf-8" From: Vidya Sagar Only a Root port initiates the L2 sequence. PCIe link is kept in L2 state during suspend. If Endpoint mode is enabled and the link is up, the software cannot proceed with suspend. However, when the PCIe Endpoint driver is probed, but the PCIe link is not up, Tegra can go into suspend state. So, allow system to suspend in this case. Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- V4: * None V3: * This is a new patch in this series drivers/pci/controller/dwc/pcie-tegra194.c | 31 +++++++++++++++++----- 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 5fa4d2adf64e..04e6c34f47f0 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -2341,16 +2341,28 @@ static void tegra_pcie_dw_remove(struct platform_de= vice *pdev) gpiod_set_value(pcie->pex_refclk_sel_gpiod, 0); } =20 -static int tegra_pcie_dw_suspend_late(struct device *dev) +static int tegra_pcie_dw_suspend(struct device *dev) { struct tegra_pcie_dw *pcie =3D dev_get_drvdata(dev); - u32 val; =20 if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) { - dev_err(dev, "Failed to Suspend as Tegra PCIe is in EP mode\n"); - return -EPERM; + if (pcie->ep_state =3D=3D EP_STATE_ENABLED) { + dev_err(dev, "Tegra PCIe is in EP mode, suspend not allowed\n"); + return -EPERM; + } + + disable_irq(pcie->pex_rst_irq); + return 0; } =20 + return 0; +} + +static int tegra_pcie_dw_suspend_late(struct device *dev) +{ + struct tegra_pcie_dw *pcie =3D dev_get_drvdata(dev); + u32 val; + if (!pcie->link_state) return 0; =20 @@ -2370,6 +2382,9 @@ static int tegra_pcie_dw_suspend_noirq(struct device = *dev) { struct tegra_pcie_dw *pcie =3D dev_get_drvdata(dev); =20 + if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) + return 0; + if (!pcie->link_state) return 0; =20 @@ -2385,6 +2400,9 @@ static int tegra_pcie_dw_resume_noirq(struct device *= dev) struct tegra_pcie_dw *pcie =3D dev_get_drvdata(dev); int ret; =20 + if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) + return 0; + if (!pcie->link_state) return 0; =20 @@ -2417,8 +2435,8 @@ static int tegra_pcie_dw_resume_early(struct device *= dev) u32 val; =20 if (pcie->of_data->mode =3D=3D DW_PCIE_EP_TYPE) { - dev_err(dev, "Suspend is not supported in EP mode"); - return -ENOTSUPP; + enable_irq(pcie->pex_rst_irq); + return 0; } =20 if (!pcie->link_state) @@ -2524,6 +2542,7 @@ static const struct of_device_id tegra_pcie_dw_of_mat= ch[] =3D { }; =20 static const struct dev_pm_ops tegra_pcie_dw_pm_ops =3D { + .suspend =3D tegra_pcie_dw_suspend, .suspend_late =3D tegra_pcie_dw_suspend_late, .suspend_noirq =3D tegra_pcie_dw_suspend_noirq, .resume_noirq =3D tegra_pcie_dw_resume_noirq, --=20 2.34.1