From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from BL2PR02CU003.outbound.protection.outlook.com (mail-eastusazon11011057.outbound.protection.outlook.com [52.101.52.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC74B18DF80; Mon, 23 Feb 2026 18:43:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.52.57 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771872223; cv=fail; b=oceDAahkV3lVJboY590nbv45G9MUqbAEs1QoWotlcSbWNMhtDBe4UlyvLr5PmJUEk0m+xvJivD4eqwWN3KpR3c15kojAik/vFCoT9WqhlH+DmwhNx1O7zdvNLllJEgV+Y3FWtMvrxxWE1CcSlOhV28T4d3UNxXmZJDmHApphZoE= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771872223; c=relaxed/simple; bh=Qo4m6mDaimp0qqQ6X60l3Luu26y8MDuY73Hwb+kYLHg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uDcK2tNBf8VGZK5mTimJn0iIot/bNZ+Wl81Epgo2BnECN+4tF7UG1r7Hz08sBk1ma5wwKv9qxHU4VBvDbgQNCWUKUEzua7X14L6/8EnyAON3s4B5oujHFhP7i4mMROj+hrUzFFnpNKeKVBULGk8XcjF+2DP0GHMd6EmNLvlkLaM= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=HZjHyNdX; arc=fail smtp.client-ip=52.101.52.57 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="HZjHyNdX" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=VGS9eiBDPpNH98EenqQWaqwTniwQ97IQ++vaBFLTEzycYVfTLu7IttZaIB52XwX+HXda/RNxw+wds4Ti1zfBE7i3KynFRXujl0w/CDBdb9NVia/z7ygLDHakEuwduYEH4wan9hoOJx0lbT95S1+AksuPXZJER4upnlA4rO5UwHOGPUJjCfaBgMIPLjKZJt79u3vxTPuZ7rjtsnTyXZQUMP0zrVBSJEqgHzjJgqxjx/P0RPH7QnMCyoRVIOr70CPbIFuakTr89pZynlaAEc5HymSPhkO+5shKWZYq6Ih2S2RypmNPmT+WNUpOFDEOd8FFuXPCwOwJ/qKE2PcrPtLqrg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=iejwPM4A+RJMm4P8DSjTsJUDLux1/J7yvrTzJEEvUis=; b=MPhNCb3V+K2OQZFufUgJcpK+4tV/OFsBYGPlkWtRbfR3jLp4q0pxHWLkBmFXV8Rz4VKCcBv0gkOSAhWPpFHvLKDd1ziqYt1SeiAtZhbXEU44PvJw5Dxf0Vdy50Y7xhyMJ12eKtD4fwE3FUXQpSK6Xm8+2c5lwb8skL065tC7D8ubk7FaSH/mUcjiGHMptZBoUme+pGdvA5j5/V2CR8JSrKXw/hcJebjEAwXKbFbvzyUAmgJQ7g5tAyvUR9F0Z7CsUdakVtDqKS80zWrHFWZiGSK2sOdUxlWLhsQF5/iIoAssCTaiMEBe2eRA9TVy9hzzywk/9nOF9Qy+ta376RAI2g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.161) smtp.rcpttodomain=google.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=iejwPM4A+RJMm4P8DSjTsJUDLux1/J7yvrTzJEEvUis=; b=HZjHyNdXPo2+vn6GLwtdUFHrbDKG5wcc7V4YJe+0mOdmcCXMzACywiWxh+RzaEtMzuVS0/6bSd3zs2Ur/Dua8ZF5Ad1es4rfe4NlWZLNPwbRi3IeBdT4WYJMuoYrvDVTc4V/FsWuWpaSW/TxSUyJr9HKsOMFO8cIeFPb1x3HwzDEM2zJvvPmb3AfGadRfxzP9mpfS8kBu6SmtHLRBl/2Qfm5wpxY8gcBdogPY4nwDhCDfT2sxkzSqlQbYtFXJAb+QYm4fdkmJiGE7uX8polN2lv7/1fHIrNK0SXk5BTODMUs2YzIkxPPQnBmrxsu1ms68TO00Sp8uWeSRzcGcKLRYw== Received: from BLAPR05CA0047.namprd05.prod.outlook.com (2603:10b6:208:335::28) by DM4PR12MB7647.namprd12.prod.outlook.com (2603:10b6:8:105::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9632.21; Mon, 23 Feb 2026 18:43:33 +0000 Received: from MN1PEPF0000ECD6.namprd02.prod.outlook.com (2603:10b6:208:335:cafe::71) by BLAPR05CA0047.outlook.office365.com (2603:10b6:208:335::28) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9632.21 via Frontend Transport; Mon, 23 Feb 2026 18:43:32 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.161) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by MN1PEPF0000ECD6.mail.protection.outlook.com (10.167.242.135) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9632.12 via Frontend Transport; Mon, 23 Feb 2026 18:43:32 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 23 Feb 2026 10:43:04 -0800 Received: from mmaddireddy-ubuntu.nvidia.com (10.126.230.35) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 23 Feb 2026 10:42:58 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v6 07/13] PCI: tegra194: Set LTR message request before PCIe link up Date: Tue, 24 Feb 2026 00:11:45 +0530 Message-ID: <20260223184151.3083221-8-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260223184151.3083221-1-mmaddireddy@nvidia.com> References: <20260223184151.3083221-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: MN1PEPF0000ECD6:EE_|DM4PR12MB7647:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ef3ca6a-4fcf-4e1c-aec3-08de730b7231 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|82310400026|1800799024|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?YZj82K26GJ0wXQuVzwQHNUL7DTMEu0LwSrplIO/lItUdnnUQYxmHy6n3W73M?= =?us-ascii?Q?uKm/wJrcIGH+tj1RoyixyONA16ux8m3qz/zM9rsW03fC1bYMo3622rFnbk6F?= =?us-ascii?Q?yKOwHEbyflcGJOf8uPb/QmfuTxip8YRNRBK4jj1VxBCMQTYupKRNTROJl1kO?= =?us-ascii?Q?axEW2WUbhtaPMKJX01J7yUA18WTHRFFqT5PA2A4Se2MxnSN2EfvRYnbgDiXv?= =?us-ascii?Q?1bQmrrjO+FHQamGhemk3DkgruKh7jkbJPtI8tMutyJ1HlIBOpr54VwwHe2TL?= =?us-ascii?Q?c133imvHNnWjFdihn+pCk50cgzLBsR9dOTSoNgMJHeUpirSxm6ynRHnjQ2UF?= =?us-ascii?Q?eoDr89dhAB8eDrr8sgvF2kMeoX5Xcwh+hLlDxu0u2+YmeuqmYr6I74JiZwLt?= =?us-ascii?Q?g2d7BNHSY0PpTG/B8Dm8jfSxs56jwP9xgFv4osMHsmI26/Fc38dU39/hL355?= =?us-ascii?Q?QzX4cexzNMM5MMQ/Sm5JSYjUeyysTJmlvYG8FMrgylngJsQgCiTRPpwJAlQS?= =?us-ascii?Q?nvDk+wQAELE+0B+IxzWzzUSedS6QoX86Yqoi1oEYFWOnJ/FgNpm/AVMPJKAz?= =?us-ascii?Q?mXpwdP2QhVcpsGmx9K0vdafQdOT49lObTyAeOZw0fwUECr0TNEMQvIBPYEOj?= =?us-ascii?Q?7iU/mbV6aCc97QtjVzzanYOnifZxFNn4SNS2rKYk1zB6byHsySQd0yCQizPC?= =?us-ascii?Q?l0mj8BEIr8hQSF1nK9kLIDApP0Qdh5IRf24Ndj3rNrg/oXVa7sUVu5nPLsAG?= =?us-ascii?Q?vAHoXRkjFfQarTniyTS3K9CJFnOxrIKb+lTmBA8syW8zku+fvD2UlFTLTz1r?= =?us-ascii?Q?D9jqWyTk0w3Wg1ELg60Fb4/j+K7l0mcWpb2Sn/yUryn1YPhtN2QkzlB6GLYp?= =?us-ascii?Q?1VMDieMK+f5d2PEHoS6WcNs+pBZwLKNikI5/Kt28sZ8mHEBSQFXGws5HZ+Sb?= =?us-ascii?Q?flqW4/C8IR0z8Xto998GQoMYEky+aRi+wzEtHYfuxMEMaw/6pPJl9MgjjYqv?= =?us-ascii?Q?gosgwXHBRFJe3k/zkb2CMmI7x6dy2i4sHLRS1/QET2OkRlatRA61HH1RZwPG?= =?us-ascii?Q?jntBqI31wz2KX7f5hH6t/K/fWFeiYS7dUz7vd7oRElsmWcYaQiNpqGv/Sgx3?= =?us-ascii?Q?RSlZEUNwwoh3ZT7DHTj0ZLpoHga+/8pWXGJr8g5YXEm8UhfTbKNcXhLClXmd?= =?us-ascii?Q?/VBKpdzVcH59T4D2tcAJjJIou9PLJHkiq3xUx0inIDmYDRGLBVWuRn44kiJk?= =?us-ascii?Q?+SSdxKjSC94JeMc1otsxuNvF8aK7HtM2Oy2sskk1VEmFTtRZThmIAkmIO6hB?= =?us-ascii?Q?lcGSfrxFameeBzv85rz9cMViQXrHhXWg+ZvZ5Fl36MvohjhbjCnBvkH4iQeB?= =?us-ascii?Q?aB0oyrQ6jEyx7mFlVoBLfomHRa7iBV20+M4E59g2w4UyQ8ZMhl6KM6Xo/3k5?= =?us-ascii?Q?rIpfz7+gqtzSLOAu01EjJv4pMQpXs+jJfYdGc/zOWdgivGzfRHN1GlS8oejV?= =?us-ascii?Q?ieThDaxrWknCijXFLfNXVX1tfgmIg5bo9kKVDKyJBQxFZNfJYSE3GqqYlZOH?= =?us-ascii?Q?NjBEZF2sD/RklEvcPRqdhOp6nRL2VnbVHqdAoaLrI74XKnMoO/23NH37lSn+?= =?us-ascii?Q?eo4lJUi1812B5pPIkjGgfjIDRTZWySkpljit1a6mrwUzvGK404KoyEKdQB0o?= =?us-ascii?Q?ooHkka10FJRJIzCkQnLOiIEORnk=3D?= X-Forefront-Antispam-Report: CIP: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)(7416014)(376014)(36860700013)(82310400026)(1800799024)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 4xFSY6zsnRUgty1zatfEmSKc2Hl+fJt0hc8S7jY7NF3bX9MwpusMuAckA4Sd3rAShrDLDtxCEw1eqxWpuJpkc9DTsSkucSXcfWNi2VzOexUTCMPq5H3S/76zG9hRp5gIzFCxr3QbCLqLWWV3iKyJRzuFq347/zUVr93dJJ0XNbWIf5UcpgZBheEQkCf7Aod6bTTubU2Nedfujacv/q/Fl1KDzMfMXKC5LeHvjyyKe0kc3sksSkqgFWb/qiWLVNhkp7CnFDbBcFSfzwFhAgkkRLJnJdnvwfrfQG1actPkA1fYtp8ggYxidCXQmsvyqCZ1gHwpTxetYwHVHWpIK3D3D3psgZTVeP2tUWRpY22s+zfyJgaRXrXKz6WHsqZEIbrgLbCsP5SPn7c4Ei2r6HKg0gn6EUDFKQGaeSt4kDfuj5ie0FtJ2gpl6HJrv/zV29iT X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Feb 2026 18:43:32.8968 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ef3ca6a-4fcf-4e1c-aec3-08de730b7231 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: MN1PEPF0000ECD6.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7647 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. Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Tegra194") Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- Changes V1 -> V6: None 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/controller/dwc/pcie-tegra194.c index a6868b77e3b7..ad1056d68d6d 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -124,6 +124,7 @@ #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) #define APPL_LTR_MSG_2 0xC8 @@ -488,15 +489,6 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg) if (val & PCI_COMMAND_MASTER) { ktime_t timeout; - /* 110us for both snoop and no-snoop */ - val = 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 = appl_readl(pcie, APPL_LTR_MSG_2); val |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; @@ -1805,6 +1797,11 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) val |= APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); + /* 110us for both snoop and no-snoop */ + val = 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ; + val |= (val << LTR_MST_NO_SNOOP_SHIFT); + appl_writel(pcie, val, APPL_LTR_MSG_1); + reset_control_deassert(pcie->core_rst); val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); -- 2.34.1