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Thu, 21 Jan 2021 03:28:11 +0000 To: Can Guo Cc: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v11 0/3] Three changes related with UFS clock scaling From: "Martin K. Petersen" In-Reply-To: <1611137065-14266-1-git-send-email-cang@codeaurora.org> (Can Guo's message of "Wed, 20 Jan 2021 02:04:20 -0800") Organization: Oracle Corporation Message-ID: References: <1611137065-14266-1-git-send-email-cang@codeaurora.org> Date: Wed, 20 Jan 2021 22:28:06 -0500 Content-Type: text/plain X-Originating-IP: [138.3.200.58] X-ClientProxiedBy: CH2PR02CA0011.namprd02.prod.outlook.com (2603:10b6:610:4e::21) To PH0PR10MB4759.namprd10.prod.outlook.com (2603:10b6:510:3d::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ca-mkp.ca.oracle.com (138.3.200.58) by CH2PR02CA0011.namprd02.prod.outlook.com (2603:10b6:610:4e::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.12 via Frontend Transport; Thu, 21 Jan 2021 03:28:10 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2cb99e79-5765-4881-a059-08d8bdbc9414 X-MS-TrafficTypeDiagnostic: PH0PR10MB4440: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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It means that clock scaling invoked through these > devfreq sysfs nodes can happen at any time regardless of the state of > UFS host and/or device. We need to control and synchronize clock > scaling in this scenario. Applied to 5.12/scsi-staging, thanks! -- Martin K. Petersen Oracle Linux Engineering