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Sun, 25 Jan 2026 23:47:07 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , <18255117159@163.com> CC: , , , , "Manikanta Maddireddy" Subject: [PATCH V4 14/22] PCI: tegra194: Set LTR message request before PCIe link up Date: Mon, 26 Jan 2026 13:15:11 +0530 Message-ID: <20260126074519.3426742-15-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: SJ5PEPF00000206:EE_|CH2PR12MB9457:EE_ X-MS-Office365-Filtering-Correlation-Id: fc3ccaff-3c0c-427b-2de6-08de5caf281e 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 07:47:29.3926 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fc3ccaff-3c0c-427b-2de6-08de5caf281e 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: SJ5PEPF00000206.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB9457 Content-Type: text/plain; charset="utf-8" From: Vidya Sagar LTR message should be sent as soon as the root port enables LTR in the endpoint. Set snoop & no snoop LTR timing and LTR message request before PCIe links up. This ensures that LTR message is sent upstream as soon as LTR is enabled. 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 | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 5a3e85c53dd7..6fcfff93d4bc 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -126,6 +126,7 @@ =20 #define APPL_LTR_MSG_1 0xC4 #define LTR_MSG_REQ BIT(15) +#define LTR_MST_NO_SNOOP_SHIFT 16 #define LTR_NOSNOOP_MSG_REQ BIT(31) =20 #define APPL_LTR_MSG_2 0xC8 @@ -491,15 +492,6 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, v= oid *arg) if (val & PCI_COMMAND_MASTER) { ktime_t timeout; =20 - /* 110us for both snoop and no-snoop */ - val =3D FIELD_PREP(PCI_LTR_VALUE_MASK, 110) | - FIELD_PREP(PCI_LTR_SCALE_MASK, 2) | - LTR_MSG_REQ | - FIELD_PREP(PCI_LTR_NOSNOOP_VALUE, 110) | - FIELD_PREP(PCI_LTR_NOSNOOP_SCALE, 2) | - LTR_NOSNOOP_MSG_REQ; - appl_writel(pcie, val, APPL_LTR_MSG_1); - /* Send LTR upstream */ val =3D appl_readl(pcie, APPL_LTR_MSG_2); val |=3D APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; @@ -1879,6 +1871,11 @@ static void pex_ep_event_pex_rst_deassert(struct teg= ra_pcie_dw *pcie) val |=3D APPL_INTR_EN_L1_8_EDMA_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_8_0); =20 + /* 110us for both snoop and no-snoop */ + val =3D 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ; + val |=3D (val << LTR_MST_NO_SNOOP_SHIFT); + appl_writel(pcie, val, APPL_LTR_MSG_1); + reset_control_deassert(pcie->core_rst); =20 val =3D dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); --=20 2.34.1