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Thread-Topic: [PATCH v8 2/2] pm80xx : Staggered spin up support. Thread-Index: AQHWdyGWFMJ2LWitWEWbukXdJDG1gKlUoF5sgA5p9LA= Date: Fri, 11 Sep 2020 05:41:56 +0000 Message-ID: References: <20200820185123.27354-1-Viswas.G@microchip.com.com> <20200820185123.27354-3-Viswas.G@microchip.com.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: oracle.com; dkim=none (message not signed) header.d=none;oracle.com; dmarc=none action=none header.from=microchip.com; x-originating-ip: [43.229.88.92] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 3b6fbe86-cb77-4165-6e0a-08d85615651e x-ms-traffictypediagnostic: SN6PR11MB3248: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-bypassexternaltag: True x-ms-oob-tlc-oobclassifiers: OLM:7691; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: BcDyndX155/DC8dfSBYthrq+NgmDoPHWpmOZRCICh5nJ8V1cZhepm0HkPT9OGRwj34Gw+wf9jd+b/SMh7C5lD64HLEGJ+3NbiANpQWODuNebKZiw2EWzWUNjJT5grmVVKmSjQ9oBiCxWG9MHrC2AHJ8S6p4pgW2Mn5Lz7IoKt15lEO+bMUHcX8pQHAzTICIyArcQKlwXvG3tOx+lYGgz05mYDyF4/WKiysjddNgBdLQiDTIelzl++8gKG7WnRNerj50KHVe1D/U1TE7QfPj4G2kUlVbT3DSql1CNa/3iaGeiWoSNru6GWCwS3iDmsxxN x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR11MB3488.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(396003)(39860400002)(136003)(346002)(376002)(83380400001)(66946007)(33656002)(54906003)(53546011)(55236004)(2906002)(26005)(86362001)(7696005)(9686003)(76116006)(5660300002)(8676002)(110136005)(71200400001)(6506007)(66556008)(8936002)(316002)(52536014)(478600001)(66446008)(4326008)(186003)(66476007)(55016002)(64756008);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB3488.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3b6fbe86-cb77-4165-6e0a-08d85615651e X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2020 05:41:56.2051 (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: SbQuB9YJSgNp8Hd4mNxTgJ31xizlAtmOgrOTEiqaGXEhdZ35cLbqIRoL4a+XnvTY/k6iQHhv3yAW0CB5CFnJ+w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR11MB3248 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hi Martin,=20 All raid controllers, newer HBAs, and sas expanders do this operation in th= e product firmware itself and there is no mass need to have it done in libs= as. In that case, Will it be good to keep this in driver itself ? Regards, Viswas G > -----Original Message----- > From: Martin K. Petersen > Sent: Wednesday, September 2, 2020 6:51 AM > To: Viswas G > Cc: linux-scsi@vger.kernel.org; Vasanthalakshmi Tharmarajan - I30664 > ; Viswas G - I30667 > ; Deepak Ukey - I31172 > ; martin.petersen@oracle.com; > yuuzheng@google.com; auradkar@google.com; vishakhavc@google.com; > bjashnani@google.com; radha@google.com; akshatzen@google.com > Subject: Re: [PATCH v8 2/2] pm80xx : Staggered spin up support. >=20 > EXTERNAL EMAIL: Do not click links or open attachments unless you know > the content is safe >=20 > Viswas, >=20 > > As a part of drive discovery, driver will initaite the drive spin up. > > If all drives do spin up together, it will result in large power > > consumption. To reduce the power consumption, driver provide an option > > to make a small group of drives (say 3 or 4 drives together) to do the > > spin up. The delay between two spin up group and no of drives to spin > > up (group) can be programmed by the customer in seeprom and driver > > will use it to control the spinup. >=20 > Please implement this in libsas as several people have suggested. > Thanks! >=20 > -- > Martin K. Petersen Oracle Linux Engineering