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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DS1PEPF00017098.mail.protection.outlook.com (10.167.18.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7544.18 via Frontend Transport; Tue, 7 May 2024 07:16:07 +0000 Received: from pyuan-Chachani-VN.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 7 May 2024 02:15:59 -0500 From: Perry Yuan <perry.yuan@amd.com> To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>, <viresh.kumar@linaro.org>, <Ray.Huang@amd.com>, <gautham.shenoy@amd.com>, <Borislav.Petkov@amd.com> CC: <Alexander.Deucher@amd.com>, <Xinmei.Huang@amd.com>, <Xiaojian.Du@amd.com>, <Li.Meng@amd.com>, <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH 04/11] Documentation: PM: amd-pstate: introducing recommended reboot requirement during driver switch Date: Tue, 7 May 2024 15:15:20 +0800 Message-ID: <cba2303c23bb579299f7c268b49286e62782893e.1715065568.git.perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <cover.1715065568.git.perry.yuan@amd.com> References: <cover.1715065568.git.perry.yuan@amd.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: <linux-pm.vger.kernel.org> List-Subscribe: <mailto:linux-pm+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-pm+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017098:EE_|PH8PR12MB6889:EE_ X-MS-Office365-Filtering-Correlation-Id: df8941bd-01b3-4e18-d743-08dc6e659092 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|376005|1800799015|36860700004|82310400017; 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| Series |
AMD Pstate Driver Fixes and Improvements
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expand
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diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 1e0d101b020a..2695feec1baa 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -299,6 +299,10 @@ module which supports the new AMD P-States mechanism on most of the future AMD platforms. The AMD P-States mechanism is the more performance and energy efficiency frequency management method on AMD processors. +When users attempt to switch from the acpi-cpufreq driver to the amd-pstate driver's working mode, +it is recommended to reboot the system. This is to ensure that any low-level power management +control states are properly switched to pstate control. By rebooting, the firmware can initialize +with optimal power states, reducing the likelihood of unexpected issues. ``amd-pstate`` Driver Operation Modes ======================================
It is highly recommended to reboot the system when switching between the 'amd-pstate' and 'acpi-cpufreq' drivers to avoid potential unexpected issues. Rebooting will ensure that the system properly applies the changes and allows for a seamless transition between the drivers. Reported-by : Reported-by: Artem S. Tashkinov <aros@gmx.com> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215801 Signed-off-by: Perry Yuan <perry.yuan@amd.com> --- Documentation/admin-guide/pm/amd-pstate.rst | 4 ++++ 1 file changed, 4 insertions(+)