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Hou" To: "linux-pci@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "gustavo.pimentel@synopsys.com" , "jingoohan1@gmail.com" , "bhelgaas@google.com" , "robh+dt@kernel.org" , "mark.rutland@arm.com" , "shawnguo@kernel.org" , Leo Li , "lorenzo.pieralisi@arm.com" CC: "M.h. Lian" , "Z.q. Hou" Subject: [PATCH 2/4] PCI: dwc: Return directly when num-lanes is not found Thread-Topic: [PATCH 2/4] PCI: dwc: Return directly when num-lanes is not found Thread-Index: AQHVUMWJYdzIy46VokSNj8ZzDl4Zng== Date: Mon, 12 Aug 2019 04:22:22 +0000 Message-ID: <20190812042435.25102-3-Zhiqiang.Hou@nxp.com> References: <20190812042435.25102-1-Zhiqiang.Hou@nxp.com> In-Reply-To: <20190812042435.25102-1-Zhiqiang.Hou@nxp.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: HK0PR03CA0060.apcprd03.prod.outlook.com (2603:1096:203:52::24) To DB8PR04MB6747.eurprd04.prod.outlook.com (2603:10a6:10:10b::31) authentication-results: spf=none (sender IP is ) smtp.mailfrom=zhiqiang.hou@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.17.1 x-originating-ip: [119.31.174.73] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: ec292f5f-ba13-49dc-c1a8-08d71edcac25 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600148)(711020)(4605104)(1401327)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:DB8PR04MB5931; x-ms-traffictypediagnostic: DB8PR04MB5931: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:2331; x-forefront-prvs: 012792EC17 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(346002)(136003)(376002)(39860400002)(396003)(366004)(189003)(199004)(6436002)(256004)(25786009)(66476007)(66556008)(66946007)(50226002)(2616005)(476003)(64756008)(186003)(11346002)(446003)(486006)(6486002)(66066001)(66446008)(53936002)(7416002)(71190400001)(6512007)(71200400001)(2501003)(8936002)(4326008)(4744005)(8676002)(6116002)(3846002)(76176011)(52116002)(110136005)(54906003)(305945005)(7736002)(1076003)(81166006)(81156014)(86362001)(5660300002)(14454004)(26005)(478600001)(36756003)(2201001)(2906002)(386003)(6506007)(102836004)(99286004)(316002)(921003)(1121003);DIR:OUT;SFP:1101;SCL:1;SRVR:DB8PR04MB5931;H:DB8PR04MB6747.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: tR8ohjz6E/Rp1PIl5yJlCWk20lbro7Diom+951JzfB6MhRkNAm2RlHY2SO9O7XQxmFoWA3s14CNCMIiJ5bqW6XPW2/s4i4d3CS5hu962WfY+r4kT+xEJiH1dQRcWUsSGzPvel2xr/m/9sCj3nV9XEaKXJ+O1ch/GZKTygG1oy6XFshbUay6btZzQF4Tf/E4VFr/BNf62G8Eu0Rl5geNHxJJT/vjw0mqffChClSURSHaSAMOHF8Ecjtit/PwtTn4ExRlfP+tLDR9UDciet//KF/zw17OVWXUgfCf2ByecLVlLD9ZZvc+OXijlid1ykStFMzmqC3DCr1/dMRD1LqRGTocSaLQ6b7926cbnQRC6kyXHtgPy6setSCwrvZjpKyelVeqy5e3Psn6QOY9Kcn/1SrBu4lOoTjl7yHk0lqRrH6I= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: ec292f5f-ba13-49dc-c1a8-08d71edcac25 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Aug 2019 04:22:22.9676 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ujcgmYEeyLeE1sc/ZYUQHrsZuoQSQZtPTYOfHtYekD/078USWxQOWYQAEM5dcEP4gJGkboecxGpjliDVaAL2qQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB5931 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Hou Zhiqiang The num-lanes is optional, so probably it isn't added on some platforms. The subsequent programming is base on the num-lanes, hence return when it is not found. Signed-off-by: Hou Zhiqiang --- drivers/pci/controller/dwc/pcie-designware.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/con= troller/dwc/pcie-designware.c index 7d25102c304c..0a89bfd1636e 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -423,8 +423,10 @@ void dw_pcie_setup(struct dw_pcie *pci) =20 =20 ret =3D of_property_read_u32(np, "num-lanes", &lanes); - if (ret) - lanes =3D 0; + if (ret) { + dev_dbg(pci->dev, "property num-lanes isn't found\n"); + return; + } =20 /* Set the number of lanes */ val =3D dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL); --=20 2.17.1