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GET /api/patches/2194359/?format=api
{ "id": 2194359, "url": "http://patchwork.ozlabs.org/api/patches/2194359/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/patch/20260208180746.2024338-14-mmaddireddy@nvidia.com/", "project": { "id": 21, "url": "http://patchwork.ozlabs.org/api/projects/21/?format=api", "name": "Linux Tegra Development", "link_name": "linux-tegra", "list_id": "linux-tegra.vger.kernel.org", "list_email": "linux-tegra@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260208180746.2024338-14-mmaddireddy@nvidia.com>", "list_archive_url": null, "date": "2026-02-08T18:07:46", "name": "[V5,13/13] PCI: tegra194: Set LTR message request before PCIe link up", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "33e87c40a243db106694c1a5375a4918bb1deb4f", "submitter": { "id": 72399, "url": "http://patchwork.ozlabs.org/api/people/72399/?format=api", "name": "Manikanta Maddireddy", "email": "mmaddireddy@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-tegra/patch/20260208180746.2024338-14-mmaddireddy@nvidia.com/mbox/", "series": [ { "id": 491428, "url": "http://patchwork.ozlabs.org/api/series/491428/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/list/?series=491428", "date": "2026-02-08T18:07:33", "name": "Fixes to pcie-tegra194 driver", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/491428/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2194359/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2194359/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-tegra+bounces-11867-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-tegra@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ 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<lpieralisi@kernel.org>, <kwilczynski@kernel.org>,\n\t<mani@kernel.org>, <robh@kernel.org>, <krzk+dt@kernel.org>,\n\t<conor+dt@kernel.org>, <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,\n\t<jingoohan1@gmail.com>, <vidyas@nvidia.com>, <cassel@kernel.org>,\n\t<18255117159@163.com>", "CC": "<linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,\n\t<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>, \"Manikanta\n Maddireddy\" <mmaddireddy@nvidia.com>", "Subject": "[V5,13/13] PCI: tegra194: Set LTR message request before PCIe link up", "Date": "Sun, 8 Feb 2026 23:37:46 +0530", "Message-ID": "<20260208180746.2024338-14-mmaddireddy@nvidia.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260208180746.2024338-1-mmaddireddy@nvidia.com>", "References": "<20260208180746.2024338-1-mmaddireddy@nvidia.com>", "Precedence": "bulk", "X-Mailing-List": "linux-tegra@vger.kernel.org", "List-Id": "<linux-tegra.vger.kernel.org>", "List-Subscribe": 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"X-Forefront-Antispam-Report": "\n\tCIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(36860700013)(82310400026)(1800799024)(921020);DIR:OUT;SFP:1101;", "X-MS-Exchange-AntiSpam-MessageData-ChunkCount": "1", "X-MS-Exchange-AntiSpam-MessageData-0": "\n\tCbnrQ9f/kpx2PUZ8oCxjv7bCak/1Yq6uu8pv2lsJC+ktaM0gABieVAWPpuumsehB5SSIn40dOTogKw5EDVT4gqJRC5+zKF3GPKHCl2f17vJqSO1EBZhimPbAbqhKpeEoDhA4J0mMDXCJWcyKhGsmtEmo6FSu7uOJB/0b733Ox9qb39wS39NJrTyy6q5BxQfrMOD1EoM4gMqsA5LietQIyzTDgVVnUlvd9y1XK5z23n9DQfJZy68HciSwCwmpLFovyrTPWgKsG9dgT235a92tsB+tAi5o488Ynocl6fJMY2MaqZqPR3/yWv2FguVTtvg2hfbnFIP9gS9oGchSB92SkEOwnH13K7mf+AzRaGRZZB7cyKh7pCc9RzPtVk4iNgNz+O7AsTXpcR/zWpgODz11MSBZK1JCUNbIP7SwOzVdYUQwpC7pCPjo0LwNqM4oZZoj", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "08 Feb 2026 18:09:30.9272\n (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n a07f364b-217e-4c34-18d6-08de673d34cf", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n\tSJ1PEPF000023D8.namprd21.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "MW4PR12MB6875" }, "content": "From: Vidya Sagar <vidyas@nvidia.com>\n\nLTR message should be sent as soon as the root port enables LTR in the\nendpoint. Set snoop & no snoop LTR timing and LTR message request before\nPCIe links up. This ensures that LTR message is sent upstream as soon as\nLTR is enabled.\n\nFixes: c57247f940e8 (\"PCI: tegra: Add support for PCIe endpoint mode in Tegra194\")\nSigned-off-by: Vidya Sagar <vidyas@nvidia.com>\nSigned-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>\n---\nV5:\n* None\n\nV4:\n* None\n\nV3:\n* None\n\nV2:\n* None\n\n drivers/pci/controller/dwc/pcie-tegra194.c | 15 ++++++---------\n 1 file changed, 6 insertions(+), 9 deletions(-)", "diff": "diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c\nindex 0f669933b108..9883d14f7f97 100644\n--- a/drivers/pci/controller/dwc/pcie-tegra194.c\n+++ b/drivers/pci/controller/dwc/pcie-tegra194.c\n@@ -124,6 +124,7 @@\n \n #define APPL_LTR_MSG_1\t\t\t\t0xC4\n #define LTR_MSG_REQ\t\t\t\tBIT(15)\n+#define LTR_MST_NO_SNOOP_SHIFT\t\t\t16\n #define LTR_NOSNOOP_MSG_REQ\t\t\tBIT(31)\n \n #define APPL_LTR_MSG_2\t\t\t\t0xC8\n@@ -488,15 +489,6 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg)\n \tif (val & PCI_COMMAND_MASTER) {\n \t\tktime_t timeout;\n \n-\t\t/* 110us for both snoop and no-snoop */\n-\t\tval = FIELD_PREP(PCI_LTR_VALUE_MASK, 110) |\n-\t\t FIELD_PREP(PCI_LTR_SCALE_MASK, 2) |\n-\t\t LTR_MSG_REQ |\n-\t\t FIELD_PREP(PCI_LTR_NOSNOOP_VALUE, 110) |\n-\t\t FIELD_PREP(PCI_LTR_NOSNOOP_SCALE, 2) |\n-\t\t LTR_NOSNOOP_MSG_REQ;\n-\t\tappl_writel(pcie, val, APPL_LTR_MSG_1);\n-\n \t\t/* Send LTR upstream */\n \t\tval = appl_readl(pcie, APPL_LTR_MSG_2);\n \t\tval |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE;\n@@ -1799,6 +1791,11 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)\n \tval |= APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN;\n \tappl_writel(pcie, val, APPL_INTR_EN_L1_0_0);\n \n+\t/* 110us for both snoop and no-snoop */\n+\tval = 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ;\n+\tval |= (val << LTR_MST_NO_SNOOP_SHIFT);\n+\tappl_writel(pcie, val, APPL_LTR_MSG_1);\n+\n \treset_control_deassert(pcie->core_rst);\n \n \t/* Perform cleanup that requires refclk and core reset deasserted */\n", "prefixes": [ "V5", "13/13" ] }