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Petersen" CC: "James E.J. Bottomley" , Evan Green , Stanley Chu , "linux-kernel@vger.kernel.org" , "linux-scsi@vger.kernel.org" Subject: RE: [PATCH v1] scsi: ufs: change msleep to usleep_range Thread-Topic: [PATCH v1] scsi: ufs: change msleep to usleep_range Thread-Index: AdU6/zmiJJopDFlPQEeuzjc9BNSdLAApAIHw Date: Tue, 16 Jul 2019 06:54:50 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Avri.Altman@wdc.com; x-originating-ip: [212.25.79.133] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d76c0bdd-44c6-48eb-71c6-08d709ba7f8e x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:SN6PR04MB4112; x-ms-traffictypediagnostic: SN6PR04MB4112: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:6108; x-forefront-prvs: 0100732B76 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(136003)(366004)(346002)(376002)(39860400002)(396003)(199004)(189003)(6116002)(86362001)(25786009)(478600001)(3846002)(446003)(68736007)(6436002)(8936002)(102836004)(6506007)(186003)(74316002)(26005)(33656002)(8676002)(76176011)(14454004)(229853002)(476003)(110136005)(71200400001)(11346002)(305945005)(54906003)(2906002)(71190400001)(81166006)(9686003)(52536014)(66446008)(66556008)(4326008)(53936002)(256004)(4744005)(7736002)(6246003)(81156014)(64756008)(7696005)(486006)(76116006)(55016002)(99286004)(66946007)(66476007)(66066001)(5660300002)(316002);DIR:OUT;SFP:1102;SCL:1;SRVR:SN6PR04MB4112;H:SN6PR04MB4925.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: sHaEGOuDHhogjSLr1qTFA+S9rFQM0xALbsFneNIy018ppmuJTRfQQIcj9XpHhhTOk2Bt5gNoYxDG3nB9FivrrQh9XNIXqndNFqOwWrQegpFV/Xu/MAWVVO3hKJRqYrTUkTrmliVpkfqMXm6AY1CtJPvQqYyt6ZiP1baWsinv5RJyZJKvwRSs+wbANEB7PbmkvwwMijrLDGig0tzninmteeMFc9vZS01lk/Yw9xM8WvyDykkg3LYAGpBYfoE1kQ2VI6xZNvOE2sKnMJEVfDyYLLb59o54/5U8OtsW/Eb+IPw8fgcryPWYCh11Cz1hFX4guN3m8aZ8faCfjjmByc4ruhZPM5rc/sc8uesNO1XQm+bxdKWQjtAVgLKbMD7jN4Q2oUDRe8UYyqJXGyaeiJQHAYD7yu3uoziYBM3BvFvy5S4= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: d76c0bdd-44c6-48eb-71c6-08d709ba7f8e X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Jul 2019 06:54:50.3174 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Avri.Altman@wdc.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR04MB4112 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >=20 > From: Bean Huo >=20 > This patch is to change msleep() to usleep_range() based on > Documentation/timers/timers-howto.txt. It suggests using > usleep_range() for small msec(1ms - 20ms) since msleep() > will often sleep longer than desired value. >=20 > After changing, booting time will be 5ms-10ms faster than before. > I tested this change on two different platforms, one has 5ms faster, > another one is about 10ms. I think this is different on different > platform. >=20 > Actually, from UFS host side, 1ms-5ms delay is already sufficient for > its initialization of the local UIC layer. >=20 > Fixes: 7a3e97b0dc4b ([SCSI] ufshcd: UFS Host controller driver) > Signed-off-by: Bean Huo Reviewed-by: Avri Altman