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Wed, 9 Apr 2025 14:49:37 +0000 Received: from AS8PR04MB8644.eurprd04.prod.outlook.com ([fe80::e86d:f110:534e:480a]) by AS8PR04MB8644.eurprd04.prod.outlook.com ([fe80::e86d:f110:534e:480a%5]) with mapi id 15.20.8606.033; Wed, 9 Apr 2025 14:49:36 +0000 From: Mike Looijmans To: linux-pci@vger.kernel.org CC: Mike Looijmans , Bjorn Helgaas , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Lorenzo Pieralisi , Manivannan Sadhasivam , Michal Simek , Rob Herring , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] pcie-xilinx: Wait for link-up status during initialization Date: Wed, 9 Apr 2025 16:49:24 +0200 Message-ID: <20250409144930.10402-1-mike.looijmans@topic.nl> X-Mailer: git-send-email 2.43.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain X-ClientProxiedBy: AM9P195CA0028.EURP195.PROD.OUTLOOK.COM (2603:10a6:20b:21f::33) To AS8PR04MB8644.eurprd04.prod.outlook.com (2603:10a6:20b:42b::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AS8PR04MB8644:EE_|AM0PR04MB7155:EE_|DB1PEPF000509F0:EE_|DU4PR04MB10840:EE_ X-MS-Office365-Filtering-Correlation-Id: 48b2efd8-53ea-4f05-c1e3-08dd7775c1eb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|376014|52116014|366016|1800799024|38350700014; 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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Apr 2025 14:49:40.3248 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 48b2efd8-53ea-4f05-c1e3-08dd7775c1eb X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[13.93.42.39];Helo=[westeu12-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509F0.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU4PR04MB10840 When the driver loads, the transceiver may still be in the state of setting up a link. Wait for that to complete before continuing. This fixes that the PCIe core does not work when loading the PL bitstream from userspace. There's only milliseconds between the FPGA boot and the core initializing in that case, and the link won't be up yet. The design only worked when the FPGA was programmed in the bootloader, as that will give the system hundreds of milliseconds to boot. As the PCIe spec allows up to 100 ms time to establish a link, we'll allow up to 200ms before giving up. Signed-off-by: Mike Looijmans --- (no changes since v2) Changes in v2: Split into "reset GPIO" and "wait for link" patches Add timeout explanation drivers/pci/controller/pcie-xilinx.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/= pcie-xilinx.c index 0b534f73a942..2e59b91f43e0 100644 --- a/drivers/pci/controller/pcie-xilinx.c +++ b/drivers/pci/controller/pcie-xilinx.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -126,6 +127,19 @@ static inline bool xilinx_pcie_link_up(struct xilinx_p= cie *pcie) XILINX_PCIE_REG_PSCR_LNKUP) ? 1 : 0; } =20 +static int xilinx_pci_wait_link_up(struct xilinx_pcie *pcie) +{ + u32 val; + + /* + * PCIe r6.0, sec 6.6.1 provides 100ms timeout. Since this is FPGA + * fabric, we're more lenient and allow 200 ms for link training. + */ + return readl_poll_timeout(pcie->reg_base + XILINX_PCIE_REG_PSCR, val, + (val & XILINX_PCIE_REG_PSCR_LNKUP), 2 * USEC_PER_MSEC, + 200 * USEC_PER_MSEC); +} + /** * xilinx_pcie_clear_err_interrupts - Clear Error Interrupts * @pcie: PCIe port information @@ -493,7 +507,7 @@ static void xilinx_pcie_init_port(struct xilinx_pcie *p= cie) { struct device *dev =3D pcie->dev; =20 - if (xilinx_pcie_link_up(pcie)) + if (!xilinx_pci_wait_link_up(pcie)) dev_info(dev, "PCIe Link is UP\n"); else dev_info(dev, "PCIe Link is DOWN\n"); --=20 2.43.0 Met vriendelijke groet / kind regards,=0A= =0A= Mike Looijmans=0A= System Expert=0A= =0A= =0A= TOPIC Embedded Products B.V.=0A= Materiaalweg 4, 5681 RJ Best=0A= The Netherlands=0A= =0A= T: +31 (0) 499 33 69 69=0A= E: mike.looijmans@topic.nl=0A= W: www.topic.nl=0A= =0A= Please consider the environment before printing this e-mail=0A=