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Tue, 24 Mar 2026 12:11:15 -0700 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v8 9/9] PCI: tegra194: Use aspm-l1-entry-delay-ns DT property for L1 entrance latency Date: Wed, 25 Mar 2026 00:40:00 +0530 Message-ID: <20260324191000.1095768-10-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260324191000.1095768-1-mmaddireddy@nvidia.com> References: <20260324191000.1095768-1-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: 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: DS3PEPF000099DE:EE_|DS7PR12MB5790:EE_ X-MS-Office365-Filtering-Correlation-Id: 09cf1db1-24b7-4f45-2677-08de89d92fec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|1800799024|376014|7416014|921020|22082099003|56012099003|18002099003; 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charset="utf-8" Program ASPM L1 entrance latency from the optional aspm-l1-entry-delay-ns device tree property instead of of_data. Convert the value from nanoseconds to the hardware encoding (log2(us) + 1, 3-bit field). If the property is absent, default to 7 (maximum latency). Signed-off-by: Manikanta Maddireddy --- Changes V8: Use aspm-l1-entry-delay-ns instead of of_data Changes V1 -> V7: None drivers/pci/controller/dwc/pcie-tegra194.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 3278353b2c29..a856a48362df 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -272,6 +273,7 @@ struct tegra_pcie_dw { u32 aspm_cmrt; u32 aspm_pwr_on_t; u32 aspm_l0s_enter_lat; + u32 aspm_l1_enter_lat; =20 struct regulator *pex_ctl_supply; struct regulator *slot_ctl_3v3; @@ -710,6 +712,8 @@ static void init_host_aspm(struct tegra_pcie_dw *pcie) val =3D dw_pcie_readl_dbi(pci, PCIE_PORT_AFR); val &=3D ~PORT_AFR_L0S_ENTRANCE_LAT_MASK; val |=3D (pcie->aspm_l0s_enter_lat << PORT_AFR_L0S_ENTRANCE_LAT_SHIFT); + val &=3D ~PORT_AFR_L1_ENTRANCE_LAT_MASK; + val |=3D (pcie->aspm_l1_enter_lat << PORT_AFR_L1_ENTRANCE_LAT_SHIFT); val |=3D PORT_AFR_ENTER_ASPM; dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val); } @@ -1110,6 +1114,7 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_d= w *pcie) { struct platform_device *pdev =3D to_platform_device(pcie->dev); struct device_node *np =3D pcie->dev->of_node; + u32 val; int ret; =20 pcie->dbi_res =3D platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi= "); @@ -1136,6 +1141,15 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_= dw *pcie) dev_info(pcie->dev, "Failed to read ASPM L0s Entrance latency: %d\n", ret); =20 + /* Default to max latency of 7. */ + pcie->aspm_l1_enter_lat =3D 7; + ret =3D of_property_read_u32(np, "aspm-l1-entry-delay-ns", &val); + if (!ret) { + u32 us =3D max(val / 1000, 1U); + + pcie->aspm_l1_enter_lat =3D min(ilog2(us) + 1, 7U); + } + ret =3D of_property_read_u32(np, "num-lanes", &pcie->num_lanes); if (ret < 0) { dev_err(pcie->dev, "Failed to read num-lanes: %d\n", ret); --=20 2.34.1