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Mon, 2 Mar 2026 23:20:42 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v2 3/5] PCI: tegra194: Make BAR0 programmable and remove 1MB size limit Date: Tue, 3 Mar 2026 12:50:02 +0530 Message-ID: <20260303072004.2384079-4-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260303072004.2384079-1-mmaddireddy@nvidia.com> References: <20260303072004.2384079-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@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: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C6193:EE_|SN7PR12MB7273:EE_ X-MS-Office365-Filtering-Correlation-Id: 57c6fe46-0627-4e22-d437-08de78f56fa6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|376014|7416014|1800799024|921020; X-Microsoft-Antispam-Message-Info: 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 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)(82310400026)(36860700013)(376014)(7416014)(1800799024)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: wnnIh/HlJicJHGvv4REZsGF+V9De6/fHxyVQrUjvkmX7D00sYUgzAmvpjhAbRXzdYIxG+klzZU4gPCmIcNi/Q/KszvOzZgYQkWWKdI94u/T7IltRaWqxMdeW6qkJBIc8ZUY+yMMAxRNt5P3Je4WQFJOGCnirSbh7G7jGYEnZxChoqC6w8najgGG7/w8I28d/87cMFc845AJTzAuLDVOet8MbwXVmyr/+UWa4cQOEyG/AF7xH7ygvLMSJjGBg6yBQIP5geYI07N/h3eO5Z/RpoiWp6+pYrlN8MfzcHpBqJOBoC1CppdUDakfriuhB1qGfcufnQSX+VGlETPCW9zvMXRq5Rz/w1HwHMFTduriYEx0u+/YxuOct93FEbgh4nW82P1u5TXZsKKTwqJylD6APEVDeX8h8kcaHt2FgUS8EQ2jA3YocayxWcKG/OtgQHlRR X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Mar 2026 07:21:06.7327 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 57c6fe46-0627-4e22-d437-08de78f56fa6 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: MWH0EPF000C6193.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7273 The Tegra194/234 Endpoint does not support the Resizable BAR capability, but BAR0 can be programmed to different sizes via the DBI2 BAR registers in dw_pcie_ep_set_bar_programmable(). The BAR0 size is set once during initialization. Remove the fixed 1MB limit from pci_epc_features so Endpoint function drivers can configure the BAR0 size they need. Signed-off-by: Manikanta Maddireddy --- v2: drop .type init for BAR_0 drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index ddb1570e257d..2f35f18ba766 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -2001,11 +2001,11 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, return 0; } +/* Tegra EP: BAR0 = 64-bit programmable BAR */ static const struct pci_epc_features tegra_pcie_epc_features = { .linkup_notifier = true, .msi_capable = true, - .bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M, - .only_64bit = true, }, + .bar[BAR_0] = { .only_64bit = true, }, .bar[BAR_1] = { .type = BAR_64BIT_UPPER, }, .bar[BAR_2] = { .type = BAR_DISABLED, }, .bar[BAR_3] = { .type = BAR_DISABLED, }, -- 2.34.1