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Tue, 13 Aug 2024 20:54:04 +0000 From: To: CC: , , , , , , , , , , , , , , Subject: RE: [PATCH net-next 4/4] net: dsa: microchip: add SGMII port support to KSZ9477 switch Thread-Topic: [PATCH net-next 4/4] net: dsa: microchip: add SGMII port support to KSZ9477 switch Thread-Index: AQHa6rVcEZ4QnCCduEOREErJuDT1TLIiQrSAgANopCA= Date: Tue, 13 Aug 2024 20:54:04 +0000 Message-ID: References: <20240809233840.59953-1-Tristram.Ha@microchip.com> <20240809233840.59953-5-Tristram.Ha@microchip.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: BYAPR11MB3558:EE_|MN2PR11MB4517:EE_ x-ms-office365-filtering-correlation-id: e367c5b8-fd11-4890-6886-08dcbbda111d x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR11MB3558.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014)(38070700018);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR11MB3558.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e367c5b8-fd11-4890-6886-08dcbbda111d X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Aug 2024 20:54:04.3989 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: cDWkwGUif+wcfNITvUon8AzF+rOq05RlCSS+wlL1TYYqUYAfwCWtbpndQH4ugIC8SaNBrqUob5Gxyp35JR4eh1UYhYnry48BhNiEdS6xw/8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR11MB4517 > On Fri, Aug 09, 2024 at 04:38:40PM -0700, Tristram.Ha@microchip.com wrote= : > > From: Tristram Ha > > > > The SGMII module of KSZ9477 switch can be setup in 3 ways: 0 for direct > > connect, 1 for 1000BaseT SFP, and 2 for 10/100/1000 SFP. > > > > SFP is typically used so the default is 1. The driver can detect > > 10/100/1000 SFP and change the mode to 2. For direct connect this mode > > has to be explicitly set to 0 as driver cannot detect that > > configuration. >=20 > Is 1 actually 1000BaseX? An SFP module using fibre would typically > want 1000BaseX, and only support one speed. An SFP module using copper > typically has a PHY in it, it performs auto-neg on the media side, and > then uses SGMII inband signalling to tell the MAC what data rate, > symbol duplication to do. And maybe mode 0 has in-band signalling > turned off, in which case 1000BaseX and SGMII become identical, > because it is the signalling which is different. There are 2 ways to program the hardware registers so that the SGMII module can communicate with either 1000Base-T/LX/SX SFP or 10/100/1000Base-T SFP. After a cable is plugged in to the SFP the link interrupt is triggered. For 10/100/1000Base-T SFP the connected speed is also reported. For fiber type SFP this information is not revealed so the driver assumes 1000 speed. In fact 100Base-FX fiber SFP is not supported and does not work.