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Tue, 11 Jul 2023 19:45:57 +0000 Received: from DB9PR03MB8847.eurprd03.prod.outlook.com ([fe80::4c44:4298:a37e:facd]) by DB9PR03MB8847.eurprd03.prod.outlook.com ([fe80::4c44:4298:a37e:facd%4]) with mapi id 15.20.6565.028; Tue, 11 Jul 2023 19:45:56 +0000 From: Sean Anderson To: Laurent Pinchart , Vinod Koul , Kishon Vijay Abraham I , Michal Simek , linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org, Sean Anderson Subject: [PATCH] phy: zynqmp: Allow variation in refclk rate Date: Tue, 11 Jul 2023 15:45:39 -0400 Message-Id: <20230711194542.898230-1-sean.anderson@seco.com> X-Mailer: git-send-email 2.35.1.1320.gc452695387.dirty X-ClientProxiedBy: BL1P221CA0009.NAMP221.PROD.OUTLOOK.COM (2603:10b6:208:2c5::24) To DB9PR03MB8847.eurprd03.prod.outlook.com (2603:10a6:10:3dd::13) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR03MB8847:EE_|DU0PR03MB9471:EE_|AM6EUR05FT034:EE_|AM9PR03MB7331:EE_ X-MS-Office365-Filtering-Correlation-Id: bf94cd24-c0e9-4165-f060-08db82477861 X-TrendMicro-CAS-OUT-LOOP-IDENTIFIER: 656f966764b7fb185830381c646b41a1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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X-OriginatorOrg: seco.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jul 2023 19:46:07.6718 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bf94cd24-c0e9-4165-f060-08db82477861 X-MS-Exchange-CrossTenant-Id: bebe97c3-6438-442e-ade3-ff17aa50e733 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=bebe97c3-6438-442e-ade3-ff17aa50e733;Ip=[20.160.56.82];Helo=[inpost-eu.tmcas.trendmicro.com] X-MS-Exchange-CrossTenant-AuthSource: AM6EUR05FT034.eop-eur05.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR03MB7331 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230711_124623_251963_7EA03AAF X-CRM114-Status: GOOD ( 11.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Due to limited available frequency ratios, the reference clock rate may not be exactly the same as the required rate. Allow a small (100 ppm) deviation. Signed-off-by: Sean Anderson --- drivers/phy/xilinx/phy-zynqmp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/phy/xilinx/phy-zynqmp.c b/drivers/phy/xilinx/phy-zynqmp.c index b0c2045b886e..2559c6594cea 100644 --- a/drivers/phy/xilinx/phy-zynqmp.c +++ b/drivers/phy/xilinx/phy-zynqmp.c @@ -904,7 +904,10 @@ static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev) rate = clk_get_rate(clk); for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) { - if (rate == ssc_lookup[i].refclk_rate) { + /* Allow an error of 100 ppm */ + unsigned long error = ssc_lookup[i].refclk_rate / 10000; + + if (abs(rate - ssc_lookup[i].refclk_rate) < error) { gtr_dev->refclk_sscs[refclk] = &ssc_lookup[i]; break; }