From patchwork Mon Feb 24 06:30:45 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Krishna Musham X-Patchwork-Id: 13987457 Received: from NAM02-BN1-obe.outbound.protection.outlook.com (mail-bn1nam02on2070.outbound.protection.outlook.com [40.107.212.70]) (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 2AB811DC9A2; Mon, 24 Feb 2025 06:31:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.212.70 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740378670; cv=fail; b=p7g78Cf0dEEr8yOMhBueshBCD1JkWDQte1FylYLFPU481Jxvok5EKNNZkahK2eMbSAL8fdCtD84lNQyshzjhB1Yj67klyuU/Cs/27nzyt3mETspwR6f00mYKsFsN9+oQ3bKiH7WVWLzJaIUPPhgzaRc5Sk+jR8i4OwzZKABWS1s= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740378670; c=relaxed/simple; bh=pWHCSrT2xzAEUgWWuFTaYkppz0t1hVUPaeevKAc6b7I=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=A2k8rNCtCEAdPH2wfSHEr4xP+K0kUs3ekcSbgfa0aEV/6xv32xUQEeP4+Qz5elbUxEnv1k3bQ6+RMgCNivBenYu9CT6bhLjZi14+aCpl61i4wWbHclDwC3ALJv0hoSVkRYXlgr8ETWScwwNMIlxC2+lm5UZ6SA58NIRZcVSl0Hc= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=Aa3biicW; arc=fail smtp.client-ip=40.107.212.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="Aa3biicW" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=b8GPmhmNXZTKfsNBmVINwcLeWRD4EN1nX/sf+KBRXOhfBQTlIpGX/WecasQc47vMuqiDFMWFRRQY6SELnLrosKwrCx+S6nBefPKguXRBOiZhJMBfmhmm2Z1D46Bd4Qj0qPBIGUslWZdDBih/e9xacOwfSsMLw5USraVHR4AhOytKUILhymox1oNbzalyWSlPvQ3UX43ATtB14GSZD2PTAsT+yHJN5BVyNUjGVz0QJm7Nukvn3mDeayMdMB1D7sjiJFIgT9qPSsO7RV9Xgjl8PpPm2V6NS2BDsL5LE77SMdj16CwLOhCkrkVBPgfCulIsnHCSUKErFD5uvHI9JibZmQ== 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=LXWQJQgtu1bd7MlMTuOh91civ06ZKatlE3xtFgpbL/I=; b=JraTNjRr+87aj+KA5EUgGkHrwuI5Iv6jbLeFmVe+dFbHNjFCQ11apE0bP5fnP+xEevKsmFG6WcPgXbVxkGc9QhuZ1kd32Cr96nz8joeBpfG2PBqVYslfWo1tLr9d+78Mb2TehjqF+7kqg9aC3Vo6fMYm8Q9qpQrgiSwX/hOjxgYz8ZVFapEujTjqigj8Sx9ym3Z5OxyLEoh8DoLQqnSDyhYh5kj9vjr3H18lSMIUQN+VIEYKO71f90lp2irmkhDxt95mCxgilTVm29s8uqj0/fhekgVatAnAKnkzIZ5qBzYeG+GwwKiwNOLVDqbt5LEHklEA/rmTWy3cD5TmYm4O5w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=google.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=LXWQJQgtu1bd7MlMTuOh91civ06ZKatlE3xtFgpbL/I=; b=Aa3biicWgkqbEkMKlrDQoUOsbcctTv+vrm3vz25RrF9L/VmUlDC6uhqYsr+ahTR2Czhc9QxkkKn91O5wKgmw22GqZSwXdOhjoWlHEjILVYvdvvv1wNBYxm/O8gxZWJF+FdDpaW8BS/utBKg6AJVFQI49bIwms74ILVGyUtzZEKk= Received: from BN8PR04CA0029.namprd04.prod.outlook.com (2603:10b6:408:70::42) by SA1PR12MB7126.namprd12.prod.outlook.com (2603:10b6:806:2b0::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8466.16; Mon, 24 Feb 2025 06:31:03 +0000 Received: from BN3PEPF0000B36F.namprd21.prod.outlook.com (2603:10b6:408:70:cafe::7d) by BN8PR04CA0029.outlook.office365.com (2603:10b6:408:70::42) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8466.19 via Frontend Transport; Mon, 24 Feb 2025 06:31:03 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by BN3PEPF0000B36F.mail.protection.outlook.com (10.167.243.166) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8511.0 via Frontend Transport; Mon, 24 Feb 2025 06:31:03 +0000 Received: from SATLEXMB06.amd.com (10.181.40.147) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 24 Feb 2025 00:31:03 -0600 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB06.amd.com (10.181.40.147) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 24 Feb 2025 00:31:02 -0600 Received: from xhdlc240022.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Mon, 24 Feb 2025 00:30:59 -0600 From: Sai Krishna Musham To: , , , , , , CC: , , , , , , Subject: [PATCH 1/2] dt-bindings: PCI: xilinx-cpm: Add reset-gpios for PCIe RP PERST# Date: Mon, 24 Feb 2025 12:00:45 +0530 Message-ID: <20250224063046.1438006-2-sai.krishna.musham@amd.com> X-Mailer: git-send-email 2.44.1 In-Reply-To: <20250224063046.1438006-1-sai.krishna.musham@amd.com> References: <20250224063046.1438006-1-sai.krishna.musham@amd.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B36F:EE_|SA1PR12MB7126:EE_ X-MS-Office365-Filtering-Correlation-Id: 31240d0e-3e55-4034-a6b0-08dd549ccff4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2025 06:31:03.6558 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 31240d0e-3e55-4034-a6b0-08dd549ccff4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B36F.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7126 Introduce `reset-gpios` property to enable GPIO-based control of the PCIe RP PERST# signal, generating assert and deassert signals. Signed-off-by: Sai Krishna Musham --- This patch depends on the following patch series. https://lore.kernel.org/all/20250217072713.635643-2-thippeswamy.havalige@amd.com/ --- .../devicetree/bindings/pci/xilinx-versal-cpm.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml index b63a759ec2d7..293ed36d0cea 100644 --- a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml +++ b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml @@ -33,6 +33,9 @@ properties: - const: cpm_csr minItems: 2 + reset-gpios: + description: GPIO used as PERST# signal. Please refer to pci.txt. + interrupts: maxItems: 1 @@ -63,6 +66,7 @@ properties: required: - reg - reg-names + - reset-gpios - "#interrupt-cells" - interrupts - interrupt-map @@ -99,6 +103,7 @@ examples: reg = <0x0 0xfca10000 0x0 0x1000>, <0x6 0x00000000 0x0 0x10000000>; reg-names = "cpm_slcr", "cfg"; + reset-gpios = <&gpio1 38 0x01>; pcie_intc_0: interrupt-controller { #address-cells = <0>; #interrupt-cells = <1>; @@ -127,6 +132,7 @@ examples: <0x06 0x00000000 0x00 0x1000000>, <0x00 0xfce20000 0x00 0x1000000>; reg-names = "cpm_slcr", "cfg", "cpm_csr"; + reset-gpios = <&gpio1 38 0x01>; pcie_intc_1: interrupt-controller { #address-cells = <0>; From patchwork Mon Feb 24 06:30:46 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Krishna Musham X-Patchwork-Id: 13987458 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2055.outbound.protection.outlook.com [40.107.92.55]) (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 3F2ED1EDA0C; Mon, 24 Feb 2025 06:31:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.92.55 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740378674; cv=fail; b=bbLVu/EFH5avX7dU75BReKkpTGtnT6OSVwM7jwAmtfFSeUgPqoBcBjtYiAuENh1NxpaYePvh/YCLTSXHvkoM7uBNjhOwpF03tbAh2u/9/uXLgBNZrp6xDDQvD3mYZa9Ij/xeLmCHHx8LbWQQASVy9DajIeo9/2o//oX9Pri3zWY= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740378674; c=relaxed/simple; bh=dels0NW9FnYN4X03k6hHsWAFjzoDnmp0cD+ZbNsSOdY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HuSTRjZQx0Dzk1SQebkM1deo35aboPq5TQshx04YHAz7pdTvFCx3+qGoMoCsUtPLlbidmylesaAryUgUlw3GqooWkDxQMkfvc1aF6rmu7KiYmMCrlxWFXOW9WTfKK1s9a651C4HqRRc/Gf5tv57ecfoG4fBx1Su2F0gP3K8RmPU= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=5RmSyG2W; arc=fail smtp.client-ip=40.107.92.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="5RmSyG2W" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=rMONwvH53svxBzfZ6c17fCKRzQIY35uofOigLQNWYMZQonTlQt0dILuz+Oooyb0txdASBSi9YwkgDbOJqOiTYlDcoWMRy6UEUtWwLbhJWrTdQCu+GlIlBdAFOBG6t3qOF18LWp3tMHk2bAAiBvdl27jYyVEmRZ24PSFf2ELcfLVJRO5BLs+0aaH2GGoHp8vPa5ai0Gkv2UZjr780Xu0yDL/7NOgEviHX7ZHYLw1/tkKHPDw9Yo4TMxpyfRs0DRC43Ds3hvZi9m1E/gXq4rgKkRyuKAkjeM6b62mWnDdvaSzUH8v5nKj/9rM+bLzSNFsn9L+unAlynu3dnbBERUUMxg== 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=yuqSGBzuXd0IwP10W2+zNoB8RolFIgBn/1xUC73hFvI=; b=BAgIbxM7Yi1q7vh+hJln+5jed79nnzcdMV+FHJbj9ygA88EqVx/ZHrWa71d2TD/QnH4t93ayPPiPzaFRE+AHJqe1dsOP57XLNmRzxk8FdzaD75MtUJSDrkMVcPVMEHbp5QDJrQ9e1gitYeT3CxiSvwBMQkG05OgaqiD3mi9hFZbwWvqFlyiS9Tq+Ywi4EN2jxOtyjnWAxGlk63RRgDocm5yw9RbrE5eDzZdVduNbUXEXWd1ZeYkdLQQPWvW336hvZHUFi9P4px8Rp/QBAcAklPwvg9Wmsbe9ryE+e7pl7UiC6Vsi5kTgwtEFXYJ7bk/FAD2GG9bB4+TOdUa6M3nY+w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=google.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=yuqSGBzuXd0IwP10W2+zNoB8RolFIgBn/1xUC73hFvI=; b=5RmSyG2WQ5a2Cy6tXAdBEZc4ToZ67770ieRDu1DKI7gg5PX97I5nj8bDRGzUOq9boOyGK/bBiPRjrkURRxLJ0ohqGmeamPEJ7/sjygi87kYrGx3+zIF0lYsA3gdsqh+BRP8JLduEY52NUSR3hZJz+uU5APpkhEGs8eUgKuy3HEA= Received: from BN9PR03CA0191.namprd03.prod.outlook.com (2603:10b6:408:f9::16) by SJ2PR12MB8739.namprd12.prod.outlook.com (2603:10b6:a03:549::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8466.20; Mon, 24 Feb 2025 06:31:07 +0000 Received: from BN3PEPF0000B370.namprd21.prod.outlook.com (2603:10b6:408:f9:cafe::ce) by BN9PR03CA0191.outlook.office365.com (2603:10b6:408:f9::16) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8466.19 via Frontend Transport; Mon, 24 Feb 2025 06:31:07 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by BN3PEPF0000B370.mail.protection.outlook.com (10.167.243.167) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8511.0 via Frontend Transport; Mon, 24 Feb 2025 06:31:07 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 24 Feb 2025 00:31:07 -0600 Received: from xhdlc240022.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Mon, 24 Feb 2025 00:31:03 -0600 From: Sai Krishna Musham To: , , , , , , CC: , , , , , , Subject: [PATCH 2/2] PCI: xilinx-cpm: Add support for PCIe RP PERST# signal Date: Mon, 24 Feb 2025 12:00:46 +0530 Message-ID: <20250224063046.1438006-3-sai.krishna.musham@amd.com> X-Mailer: git-send-email 2.44.1 In-Reply-To: <20250224063046.1438006-1-sai.krishna.musham@amd.com> References: <20250224063046.1438006-1-sai.krishna.musham@amd.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB03.amd.com: sai.krishna.musham@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B370:EE_|SJ2PR12MB8739:EE_ X-MS-Office365-Filtering-Correlation-Id: ac7fa751-971a-408d-a19c-08dd549cd25a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|82310400026|36860700013|13003099007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(82310400026)(36860700013)(13003099007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2025 06:31:07.6796 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ac7fa751-971a-408d-a19c-08dd549cd25a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B370.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8739 Add GPIO-based control for the PCIe Root Port PERST# signal. According to section 2.2 of the PCIe Electromechanical Specification (Revision 6.0), PERST# signal has to be deasserted after a delay of 100 ms (TPVPERL) to ensure proper reset sequencing during PCIe initialization. Signed-off-by: Sai Krishna Musham --- This patch depends on the following patch series. https://lore.kernel.org/all/20250217072713.635643-3-thippeswamy.havalige@amd.com/ --- drivers/pci/controller/pcie-xilinx-cpm.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c index 81e8bfae53d0..0e31b85658e6 100644 --- a/drivers/pci/controller/pcie-xilinx-cpm.c +++ b/drivers/pci/controller/pcie-xilinx-cpm.c @@ -6,6 +6,8 @@ */ #include +#include +#include #include #include #include @@ -568,8 +570,29 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct pci_host_bridge *bridge; struct resource_entry *bus; + struct gpio_desc *reset_gpio; int err; + /* Request the GPIO for PCIe reset signal */ + reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(reset_gpio)) { + dev_err(dev, "Failed to request reset GPIO\n"); + return PTR_ERR(reset_gpio); + } + + /* Assert the reset signal */ + gpiod_set_value(reset_gpio, 0); + + /* + * As per section 2.2 of the PCI Express Card Electromechanical + * Specification (Revision 6.0), the deassertion of the PERST# signal + * should be delayed by 100 ms (TPVPERL). + */ + msleep(100); + + /* Deassert the reset signal */ + gpiod_set_value(reset_gpio, 1); + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port)); if (!bridge) return -ENODEV;