Received: by 2002:a89:288:0:b0:1f7:eeee:6653 with SMTP id j8csp346100lqh; Tue, 7 May 2024 00:17:48 -0700 (PDT) X-Forwarded-Encrypted: i=3; AJvYcCXZbQxq2bisX+Sn0ULJMJNr1NqJhBRF1+lvcYxrEQr6qJbK5YO+PToa+gIiHzCWGRqBaUiJ0PhzJdhbVdUCCuLR9mMPY6Z68yNxLy/+IA== X-Google-Smtp-Source: AGHT+IGMjt6Jr1ruusutuNlEsPWae9Ip5xxCc10xWsTUpOYG+Ltpadw+ZADIMsLf3xXVMQZxDhyJ X-Received: by 2002:a05:620a:28ca:b0:792:95ea:44ed with SMTP id l10-20020a05620a28ca00b0079295ea44edmr7163824qkp.40.1715066268227; Tue, 07 May 2024 00:17:48 -0700 (PDT) Return-Path: Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. [147.75.199.223]) by mx.google.com with ESMTPS id j7-20020a05620a0a4700b007929275bbe3si5360087qka.353.2024.05.07.00.17.48 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 May 2024 00:17:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-170801-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; dkim=pass header.i=@amd.com header.s=selector1 header.b=aE4aTkUx; arc=fail (signature failed); spf=pass (google.com: domain of linux-kernel+bounces-170801-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-170801-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amd.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 692851C230F1 for ; Tue, 7 May 2024 07:17:08 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A01B613C9D3; Tue, 7 May 2024 07:16:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="aE4aTkUx" Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2081.outbound.protection.outlook.com [40.107.244.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 494A813BAF1; Tue, 7 May 2024 07:16:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.244.81 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715066171; cv=fail; b=YyO4F8C3UBqfYaqNxDwmKdzcDQr7O/xxEhhVKs9V8T3z6hnwkw03mmR31w3Nq64QpDcJclk9mxkShp/JwvJipHwLy4eggCoAjgPMgs635XmQ7E1ulOR21pIF0n+pq6bAg7kdQT7MvH1EudlWKnXEVvDuoj7SG+pTY9JB5JWhxpE= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715066171; c=relaxed/simple; bh=kh4vsJmdPfAdzdJqOtOv0F6/1hGxUbSaPW3t++NNOiY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MP3deUAmf7E+a2tlUhDWN2tz5dbRZ80VhgkswfNmvFYiczZBzTXdnrDtzg367Va3jZjnZe2QPitfB63NWCClpjAFSAIec3/ufag7GmwgbmN25cYJvo5MEHVu851wMGOp6zQWGQzc0UUQaN+nFdGrkf7AfgVIDz440DPamwKmldI= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=aE4aTkUx; arc=fail smtp.client-ip=40.107.244.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AHmM8JEQX60YcXnSZ/zjbPd+MEQars6bim+oR9stABahPDWXD6/gMgU2lShOh8PqSIBw5g+50LoGcJwxL55uG6ZUp4DIL8yGlJ+stgPPMcNcWi4c5RDygPE3zVMgYao67rxF6vFjbFt8+hR1E9t+QEbusosKvTJV3WoIfh+ipmelfBjNXgPJboWOkRAU5Vbtrq6LU/MB+cmpEjLhjwUwu38oW8me7nQGQE2Z2NBF8ElfrI5JnDoASUA5KatO6L5C9YBYQxt49wQcMxQIWonoKOB+FPmTNuxg1eQpc6AJGUNgg61SpH2KmTMonD2esuqagOoSKG/+FXH43L00lgDgHw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=gMpzZk2coezREsd9CfS15Sii3PkKhjR2Tzjh/3iQR2o=; b=lo3Sqafv6JS6hYKlzW8B5gmJPLuuUDs6Do7QmIHKPYgRLU1sl3TnNwpBGXi1HJhXUWvIJzSo0HJGyKmsPU1rq11z2Yuh8fzzEMYUagPyc3w7zpQoMN+Q3odib4EBnATKwFH5nlXEzJjn1xpFAd6j+m4Jf+EtrPzrAqwZJem7jcntT9x28zl4bucNvKvuW9CeRcs5KKmGcxtA/wBPMICHQVT2um31eriSLasYSDE6vcCGtPaCvV0kznGF5VeOfq6wBlWPquhe4OkOT90UUX+X+BRNeYTela+EYd00ayVM0dWMN4TfSd8GBr1otFrouXia9xGSazAec5RKXrEORoKgsw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=intel.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=gMpzZk2coezREsd9CfS15Sii3PkKhjR2Tzjh/3iQR2o=; b=aE4aTkUxuNkztvxm34Ac5yQzlWVkyYHl4RbR56bIy4zxTvOVIz0DGSPgBepch9AeWmtyjgPOCp92IuXtl0QkRQCk2zBaplXu28od74+YGKcMQwtru5GFfs1odRzgXca1J8eZ6RaobfNIfF4hQ4fsQjOMJoIZ7ZZD/jbAYZUWPnM= Received: from DS7PR06CA0032.namprd06.prod.outlook.com (2603:10b6:8:54::17) by PH8PR12MB6889.namprd12.prod.outlook.com (2603:10b6:510:1c9::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7544.39; Tue, 7 May 2024 07:16:08 +0000 Received: from DS1PEPF00017098.namprd05.prod.outlook.com (2603:10b6:8:54:cafe::ba) by DS7PR06CA0032.outlook.office365.com (2603:10b6:8:54::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7544.42 via Frontend Transport; Tue, 7 May 2024 07:16:07 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; 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 To: , , , , , CC: , , , , , 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: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?C7L2J5D0nCYpykB1N6tzfk6yNe69pFJe85EtxhZVd9kgIxkrq6ud6VkIeUeM?= =?us-ascii?Q?HqRaFA84mrrhRz3vfAYceICFjPj3D4qm1c33Mb4Id9LowFYetXrtxsJXrXD6?= =?us-ascii?Q?L80395XYZ6vYLD0jz9BSUq8+aiIimfn/NE0G1fiWLqDQ2akb8kMnJ9zmb8aE?= =?us-ascii?Q?XP1pNWQG667uIk2VmL1IsKNUWo1WWg98ppS+IoU3DM4RXt/oy7XFUESF+0DM?= =?us-ascii?Q?WmgRKJ5ZMlma//qKK55r2wNgwBHKXFdp0uhtkENyAl5rIhUpvwkBERR5Mq6y?= =?us-ascii?Q?WIAoTRdxoEo+X4VKKJ8TzvZVm0UMm9ropa21OJM8HqMFQS/j1anfae5WC0Qn?= =?us-ascii?Q?Z4Rv7RnRC47Fj/XGrW91NyLS2bRSsQ/R+sZUwrcmcUc3DH1gc622irhc5aRx?= =?us-ascii?Q?ksvSOYSTcByj5m9gdQhqB4nrbazoEd6I/Mk0eanh61nwYPUasa7wnHORR1CB?= =?us-ascii?Q?AFHOMIsigBhMGkiJyVQ8s5SAQQRW54AD8OyaRR7Of7Ll9vwv5OMCUJbYOLhG?= =?us-ascii?Q?acCfTF2sbzkStYYxuiMxK5RrscyEhWbWhKWjZJrqMK1EG2NT/dJPCm93B5Gt?= =?us-ascii?Q?J4ZVAEUYzfUps5Oa74aem1mhHAK88YyYjAWTUwD2W8KZJ9qwuYPeZTj9Vdtp?= =?us-ascii?Q?raYsCmgBzYeRmPxf+LoHCBIoazQtEo5RUJiE6E+EilAOlZCN7GLO9OxlknsD?= =?us-ascii?Q?/A5Io0vgcc9BDGC2gBfRqNoDqZa7XtFw23smS3poakGzGLcuYBBKu8O/QQ1+?= =?us-ascii?Q?5MBVU3vR9wBhnF+CZHD3gR23/kYqi/cpB91zmCsdmwGO0siYQomWuF4O2Z0O?= =?us-ascii?Q?ONRgN7AW/p4oJriPLqjFkZnYvGdunWRU69+Y3oVsHy331eFlVuZgrYiO8DTo?= =?us-ascii?Q?X+u7zlkq0TFFpBVQn6uXCaz2c3JrPiTkRX2OjUnWyKo6YVfrN+ZZc4SF3YAN?= =?us-ascii?Q?PgSeCeq4JONOeKkPetvpuqIasUgENV0DEWOobqlIKP181JBVCilp7ks9Yf8x?= =?us-ascii?Q?unwFWLJFdlPmjpmCFta8adPCum39d0exk7GqZow7F24VAOmew43N627ocos6?= =?us-ascii?Q?Bm1Xbe3Lol1/UGopEAqqqv1MjtSerHye5J/JeuxDuC0pVyoTxpdOMV0cLF+A?= =?us-ascii?Q?tFBf+QWjkHLFsNKp1sWM8LZDPywVqbNVtdv+eloS+q2EM/WKM2g4/7DVaQ5i?= =?us-ascii?Q?iPm93EkUnfDhNzmkqBVSHlrASj4ejXjht3vkM4kTT5sAhO0Br07L6IP+Bo2I?= =?us-ascii?Q?DIhS9M4oeEcS2H1schRscEYoOr8xLHSCZ+VRLbqK1k4Sw5UurnJwUYigLrmF?= =?us-ascii?Q?ZyYoESQxewWGlWrGBJLLLIjg?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(376005)(1800799015)(36860700004)(82310400017);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 May 2024 07:16:07.5281 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: df8941bd-01b3-4e18-d743-08dc6e659092 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017098.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6889 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 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215801 Signed-off-by: Perry Yuan --- Documentation/admin-guide/pm/amd-pstate.rst | 4 ++++ 1 file changed, 4 insertions(+) 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 ====================================== -- 2.34.1