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Tue, 18 Aug 2026 15:22:15 -0500 Received: from box-0.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.45 via Frontend Transport; Tue, 18 Aug 2026 15:22:14 -0500 From: To: CC: Harry Wentland , Leo Li , Aurabindo Pillai , Roman Li , Wayne Lin , Tom Chung , "Fangzhi Zuo" , Dan Wheeler , Ray Wu , Ivan Lipski , Alex Hung , James Lin , Chenyu Chen , Alvin Lee , Dillon Varone Subject: [PATCH 30/82] drm/amd/display: Add hook to disable alt-ch in PMO Date: Tue, 18 Aug 2026 16:15:22 -0400 Message-ID: <20260818202139.4172592-31-IVAN.LIPSKI@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260818202139.4172592-1-IVAN.LIPSKI@amd.com> References: <20260818202139.4172592-1-IVAN.LIPSKI@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0DE:EE_|SJ2PR12MB8874:EE_ X-MS-Office365-Filtering-Correlation-Id: 063d3012-0feb-4fc8-5762-08defd667272 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Ip=[165.204.84.17]; Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0DE.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8874 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Alvin Lee [Why&How] DML should have a method of disabling alt-ch pstate method. Add a debug mask bit to disable the alt-ch pstate method in PMO. Reviewed-by: Dillon Varone Signed-off-by: Alvin Lee Signed-off-by: Ivan Lipski --- .../drm/amd/display/dc/dml2_0/dml21/dml21_translation_helper.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/dml21_translation_helper.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/dml21_translation_helper.c index f4f848d738208..d456fb3d616d4 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/dml21_translation_helper.c +++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/dml21_translation_helper.c @@ -31,6 +31,7 @@ static void dml21_populate_pmo_options(struct dml2_pmo_options *pmo_options, disable_fams2; pmo_options->disable_drr_var = ((in_dc->debug.dml21_disable_pstate_method_mask >> 4) & 1) || disable_fams2; + pmo_options->disable_alternate_memory_training = ((in_dc->debug.dml21_disable_pstate_method_mask >> 5) & 1); pmo_options->disable_fams2 = disable_fams2; pmo_options->disable_drr_var_when_var_active = in_dc->debug.disable_fams_gaming == INGAME_FAMS_DISABLE || -- 2.43.0