{"id":2198042,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2198042/?format=json","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.0/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},"msgid":"<20260219064511.695086-3-a-garg7@ti.com>","date":"2026-02-19T06:45:11","name":"[v2,2/2] PCI: dwc: ep: Mirror the max link width and speed fields to all functions","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"58973f26521f876c2f907e8466e46d3e52a32e74","submitter":{"id":92467,"url":"http://patchwork.ozlabs.org/api/1.0/people/92467/?format=json","name":"Aksh Garg","email":"a-garg7@ti.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260219064511.695086-3-a-garg7@ti.com/mbox/","series":[{"id":492644,"url":"http://patchwork.ozlabs.org/api/1.0/series/492644/?format=json","date":"2026-02-19T06:45:10","name":"PCI: dwc: ep: Multi-function endpoint configuration fixes","version":2,"mbox":"http://patchwork.ozlabs.org/series/492644/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2198042/checks/","tags":{},"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=ti.com header.i=@ti.com header.a=rsa-sha256\n header.s=selector1 header.b=h3wGRqnM;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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helo=flwvzet200.ext.ti.com; pr=C","From":"Aksh Garg ","To":", , ,\n\t, , ,\n\t, ,\n\t, ,\n\t, ","CC":", ,\n\t, Aksh Garg ","Subject":"[PATCH v2 2/2] PCI: dwc: ep: Mirror the max link width and speed\n fields to all functions","Date":"Thu, 19 Feb 2026 12:15:11 +0530","Message-ID":"<20260219064511.695086-3-a-garg7@ti.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260219064511.695086-1-a-garg7@ti.com>","References":"<20260219064511.695086-1-a-garg7@ti.com>","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-C2ProcessedOrg":"333ef613-75bf-4e12-a4b1-8e3623f5dcea","X-EOPAttributedMessage":"0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"SJ1PEPF000023DA:EE_|CO6PR10MB5618:EE_","X-MS-Office365-Filtering-Correlation-Id":"c9e5b5fe-4d4c-40b5-e26d-08de6f8280d2","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"\n\tBCL:0;ARA:13230040|82310400026|36860700013|376014|7416014|1800799024|921020;","X-Microsoft-Antispam-Message-Info":"\n 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","X-Forefront-Antispam-Report":"\n\tCIP:198.47.21.194;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:flwvzet200.ext.ti.com;PTR:ErrorRetry;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(376014)(7416014)(1800799024)(921020);DIR:OUT;SFP:1101;","X-MS-Exchange-AntiSpam-MessageData-ChunkCount":"1","X-MS-Exchange-AntiSpam-MessageData-0":"\n\tNZSXdUzBP4XaEvjpyO4irsxnWJnlQDWNPW8WAUHIcjcQdcD3pKRhzJb2xucL6r2aTrIskIvgnDuEzxZSlinUPxW87UrNc0idwcfioPmlICFpYUjXOEo7btXj+eTpLrmrP5YaUyDfXOoVQP5TxvnGdbv9VhX0F9ixwriqgTQqEerkl96T+nibDwEhsyvEPfG356vkrlupMb+UGK9q/WHqTtqO2sgZ7iNtzInlfRv+2wJmvWUPKo+D5ls4wHfd/FZV+PQd+BWmVqCyeAwXP/v4xSf+RKRMgZ/NcvXCDlFH8Q9Q1+9+FWgAxhcXIhPvCefXxWrFcT4fTeXxMjhFg63pynqf8dq61HTGSPzKz+sbCfmFQxKR0fAdHTAtYNk5XB+rZILEc5CbsYdRxNErVkpN/NBNxzRYIpMF6Ascg5hLL0l6NjkpYJvR1HgxDLuMxwvr","X-OriginatorOrg":"ti.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"19 Feb 2026 06:45:42.9648\n (UTC)","X-MS-Exchange-CrossTenant-Network-Message-Id":"\n c9e5b5fe-4d4c-40b5-e26d-08de6f8280d2","X-MS-Exchange-CrossTenant-Id":"e5b49634-450b-4709-8abb-1e2b19b982b7","X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp":"\n TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.194];Helo=[flwvzet200.ext.ti.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n\tSJ1PEPF000023DA.namprd21.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"CO6PR10MB5618"},"content":"PCIe r6.0, section 7.5.3.6 states that for multi-function devices, the\nMax Link Width and Max Link Speed fields in the Link Capabilities\nRegister must report the same values for all functions.\n\nCurrently, dw_pcie_setup() programs these fields only for physical\nfunction 0 (PF0) via dw_pcie_link_set_max_speed() and\ndw_pcie_link_set_max_link_width(). For multi-function endpoint\nconfigurations, PF1 and beyond retain their default values, violating\nthe PCIe specification.\n\nFix this by reading the Max Link Width and Max Link Speed fields from\nPF0's Link Capabilities Register after dw_pcie_setup() completes,\nthen mirroring these values to all other physical functions.\n\nFixes: 24ede430fa49 (\"PCI: designware-ep: Add multiple PFs support for DWC\")\nFixes: 89db0793c9f2 (\"PCI: dwc: Add missing PCI_EXP_LNKCAP_MLW handling\")\nSigned-off-by: Aksh Garg \n---\n\nThe link speed and width would be negotiated through PF0 during\ninitialization that controls the link behaviour, hence it didn't broke\nthe driver. However, the change is proposed just to make the driver\ncompatible with the PCIe base specifications.\n\nThe fix is implemented in pcie-designware-ep.c rather than modifying\ndw_pcie_setup() directly to keep pcie-designware.c independent of RC/EP\nspecifics and maintain it as common code.\n\nChanges from v1 to v2:\n- Used FIELD_* macros\n\nv1: https://lore.kernel.org/all/20260202072758.101845-3-a-garg7@ti.com/\n\n .../pci/controller/dwc/pcie-designware-ep.c | 23 ++++++++++++++++++-\n 1 file changed, 22 insertions(+), 1 deletion(-)","diff":"diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c\nindex 771241e1a2c9..6b9f90810fec 100644\n--- a/drivers/pci/controller/dwc/pcie-designware-ep.c\n+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c\n@@ -1094,7 +1094,8 @@ static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)\n {\n \tstruct dw_pcie_ep *ep = &pci->ep;\n \tu8 funcs = ep->epc->max_functions;\n-\tu8 func_no;\n+\tu32 ref_lnkcap, lnkcap;\n+\tu8 func_no, offset;\n \n \tdw_pcie_dbi_ro_wr_en(pci);\n \n@@ -1102,6 +1103,26 @@ static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)\n \t\tdw_pcie_ep_init_rebar_registers(ep, func_no);\n \n \tdw_pcie_setup(pci);\n+\n+\t/*\n+\t * PCIe r6.0, section 7.5.3.6 states that for multi-function endpoints,\n+\t * max link width and speed fields must report same values for all functions.\n+\t * However, dw_pcie_setup() programs these fields only for physical function 0.\n+\t * Hence, mirror these fields to all other physical functions as well.\n+\t */\n+\tif (funcs > 1) {\n+\t\toffset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);\n+\t\tref_lnkcap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);\n+\t\tref_lnkcap = FIELD_GET(PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS, ref_lnkcap);\n+\n+\t\tfor (func_no = 1; func_no < funcs; func_no++) {\n+\t\t\toffset = dw_pcie_ep_find_capability(ep, func_no, PCI_CAP_ID_EXP);\n+\t\t\tlnkcap = dw_pcie_ep_readl_dbi(ep, func_no, offset + PCI_EXP_LNKCAP);\n+\t\t\tFIELD_MODIFY(PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS, &lnkcap, ref_lnkcap);\n+\t\t\tdw_pcie_ep_writel_dbi(ep, func_no, offset + PCI_EXP_LNKCAP, lnkcap);\n+\t\t}\n+\t}\n+\n \tdw_pcie_dbi_ro_wr_dis(pci);\n }\n \n","prefixes":["v2","2/2"]}