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Thu, 21 Jul 2022 07:21:54 -0700 From: Vidya Sagar To: , , , , , , , CC: , , , , , , , , , Subject: [PATCH V6 07/16] PCI: Disable MSI for Tegra234 root ports Date: Thu, 21 Jul 2022 19:50:43 +0530 Message-ID: <20220721142052.25971-8-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220721142052.25971-1-vidyas@nvidia.com> References: <20220721142052.25971-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 132a6bc2-e22e-4789-db60-08da6b24603d X-MS-TrafficTypeDiagnostic: BN6PR1201MB0034:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.238;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(396003)(39860400002)(346002)(376002)(136003)(36840700001)(46966006)(40470700004)(186003)(1076003)(40480700001)(110136005)(336012)(426003)(36756003)(8676002)(70206006)(54906003)(41300700001)(47076005)(70586007)(4326008)(26005)(2906002)(7696005)(2616005)(6666004)(81166007)(83380400001)(40460700003)(82310400005)(86362001)(36860700001)(7416002)(8936002)(316002)(5660300002)(82740400003)(478600001)(356005)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jul 2022 14:22:00.2757 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 132a6bc2-e22e-4789-db60-08da6b24603d X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.238];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT056.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR1201MB0034 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tegra234 PCIe rootports don't generate MSI interrupts for PME and AER events. Since PCIe spec (Ref: r4.0 sec 6.1.4.3) doesn't support using a mix of INTx and MSI/MSI-X, MSI needs to be disabled to avoid root ports service drivers registering their respective ISRs with MSI interrupt and to let only INTx be used for all events. Signed-off-by: Vidya Sagar --- V6: * None V5: * None V4: * None V3: * None V2: * Addressed review comments from Bjorn i.e. changed the PCIe spec reference to a more relevant section and modified commit message accordingly drivers/pci/quirks.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 2e68f50bc7ae..5b532449ac4f 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2709,8 +2709,8 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, nvenet_msi_disable); /* - * PCIe spec r4.0 sec 7.7.1.2 and sec 7.7.2.2 say that if MSI/MSI-X is enabled, - * then the device can't use INTx interrupts. Tegra's PCIe root ports don't + * PCIe spec r4.0 sec 6.1.4.3 says that if MSI/MSI-X is enabled,then the + * device can't use INTx interrupts. Tegra's PCIe root ports don't * generate MSI interrupts for PME and AER events instead only INTx interrupts * are generated. Though Tegra's PCIe root ports can generate MSI interrupts * for other events, since PCIe specification doesn't support using a mix of @@ -2760,6 +2760,15 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_NVIDIA, 0x10e5, DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_NVIDIA, 0x10e6, PCI_CLASS_BRIDGE_PCI, 8, pci_quirk_nvidia_tegra_disable_rp_msi); +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_NVIDIA, 0x229a, + PCI_CLASS_BRIDGE_PCI, 8, + pci_quirk_nvidia_tegra_disable_rp_msi); +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_NVIDIA, 0x229c, + PCI_CLASS_BRIDGE_PCI, 8, + pci_quirk_nvidia_tegra_disable_rp_msi); +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_NVIDIA, 0x229e, + PCI_CLASS_BRIDGE_PCI, 8, + pci_quirk_nvidia_tegra_disable_rp_msi); /* * Some versions of the MCP55 bridge from Nvidia have a legacy IRQ routing -- 2.17.1