{"id":2224179,"url":"http://patchwork.ozlabs.org/api/patches/2224179/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260417023856.3210628-1-sai.krishna.musham@amd.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260417023856.3210628-1-sai.krishna.musham@amd.com>","list_archive_url":null,"date":"2026-04-17T02:38:56","name":"PCI: amd-mdb: Assert PERST# on shutdown","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5d3c23cbd46f042ddf14560097068531622ad95e","submitter":{"id":90336,"url":"http://patchwork.ozlabs.org/api/people/90336/?format=json","name":"Sai Krishna Musham","email":"sai.krishna.musham@amd.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260417023856.3210628-1-sai.krishna.musham@amd.com/mbox/","series":[{"id":500226,"url":"http://patchwork.ozlabs.org/api/series/500226/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=500226","date":"2026-04-17T02:38:56","name":"PCI: amd-mdb: Assert PERST# on shutdown","version":1,"mbox":"http://patchwork.ozlabs.org/series/500226/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2224179/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2224179/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=amd.com header.i=@amd.com header.a=rsa-sha256\n header.s=selector1 header.b=HMOplAgM;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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helo=satlexmb07.amd.com; pr=C","None (SATLEXMB04.amd.com: sai.krishna.musham@amd.com does not\n designate permitted sender hosts)"],"From":"Sai Krishna Musham ","To":", , ,\n\t, , ,\n\t, ","CC":", ,\n\t, ,\n\t, ,\n\t","Subject":"[PATCH] PCI: amd-mdb: Assert PERST# on shutdown","Date":"Fri, 17 Apr 2026 08:08:56 +0530","Message-ID":"<20260417023856.3210628-1-sai.krishna.musham@amd.com>","X-Mailer":"git-send-email 2.44.4","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-EOPAttributedMessage":"0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"BL02EPF00021F6F:EE_|PH7PR12MB5951:EE_","X-MS-Office365-Filtering-Correlation-Id":"cf986d2c-e8b1-4237-48e8-08de9c2a7d19","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"\n\tBCL:0;ARA:13230040|7416014|376014|82310400026|1800799024|36860700016|18002099003|56012099003;","X-Microsoft-Antispam-Message-Info":"\n\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","X-Forefront-Antispam-Report":"\n\tCIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(376014)(82310400026)(1800799024)(36860700016)(18002099003)(56012099003);DIR:OUT;SFP:1101;","X-MS-Exchange-AntiSpam-MessageData-ChunkCount":"1","X-MS-Exchange-AntiSpam-MessageData-0":"\n\trWglPJPuV/xU8RW7Qyf4q/Wi/SwYTngL5m/zpb/jhs5OnO2KdqDmJhJ7zsVoIQ5IlSwImGBVlcceuPQqhSnqS4AE/prs0sMrbera0NUFeB0t2UwTrpdnonzyI2P2XW5TyeBiFUQbbyHa67RbsTE6qMiYHtsDZQa9EQMoKJBsdifykH+HllST8806JXm9k7/hleJxBXgRviZE6ZKuuc5jprSBlTe/6wVp1M+4Pwd7rCSV2yj3Her9UzD8o3DD34mQxlHPM2ObLRhZp/Xj5GGsKdvhiHoqSZYwbgZgWi7oyROB5+Cih3msVPZMZKNbLaazpSnLdCpHrP4zygyBl0+y6Kv3QSPLwcP1iMRm3I0IhHKdYHC9ViuKaiGEyBfhd1nKnHK0QYQnjB4FJi8Tb2goveNFuQ67x2DW6/HZq+Rpaa9Y18gO6sYeoeUsJ4PDLSTN","X-OriginatorOrg":"amd.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"17 Apr 2026 02:39:03.4199\n (UTC)","X-MS-Exchange-CrossTenant-Network-Message-Id":"\n cf986d2c-e8b1-4237-48e8-08de9c2a7d19","X-MS-Exchange-CrossTenant-Id":"3dd8961f-e488-4e60-8e11-a82d994e183d","X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp":"\n TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n\tBL02EPF00021F6F.namprd02.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"PH7PR12MB5951"},"content":"Add a shutdown handler for the AMD MDB PCIe host controller that\nasserts the PERST# signal via GPIO before the system powers off or\nreboots. This ensures the connected PCIe endpoint is held in reset\nduring shutdown.\n\nSigned-off-by: Sai Krishna Musham \n---\n drivers/pci/controller/dwc/pcie-amd-mdb.c | 9 +++++++++\n 1 file changed, 9 insertions(+)","diff":"diff --git a/drivers/pci/controller/dwc/pcie-amd-mdb.c b/drivers/pci/controller/dwc/pcie-amd-mdb.c\nindex 7e50e11fbffd..69d21b4727e4 100644\n--- a/drivers/pci/controller/dwc/pcie-amd-mdb.c\n+++ b/drivers/pci/controller/dwc/pcie-amd-mdb.c\n@@ -507,6 +507,14 @@ static int amd_mdb_pcie_probe(struct platform_device *pdev)\n \treturn amd_mdb_add_pcie_port(pcie, pdev);\n }\n \n+static void amd_mdb_pcie_shutdown(struct platform_device *pdev)\n+{\n+\tstruct amd_mdb_pcie *pcie = platform_get_drvdata(pdev);\n+\n+\tif (pcie->perst_gpio)\n+\t\tgpiod_set_value_cansleep(pcie->perst_gpio, 1);\n+}\n+\n static const struct of_device_id amd_mdb_pcie_of_match[] = {\n \t{\n \t\t.compatible = \"amd,versal2-mdb-host\",\n@@ -521,6 +529,7 @@ static struct platform_driver amd_mdb_pcie_driver = {\n \t\t.suppress_bind_attrs = true,\n \t},\n \t.probe = amd_mdb_pcie_probe,\n+\t.shutdown = amd_mdb_pcie_shutdown,\n };\n \n builtin_platform_driver(amd_mdb_pcie_driver);\n","prefixes":[]}