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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=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF0000020A.mail.protection.outlook.com (10.167.244.43) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.4 via Frontend Transport; Wed, 11 Nov 2026 01:44:43 +0000 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.53; Tue, 10 Nov 2026 19:44:42 -0600 Received: from wayne-dev-lnx.amd.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.53 via Frontend Transport; Tue, 10 Nov 2026 19:44:32 -0600 From: Wayne Lin 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 , Allen Pan , Dillon Varone , Charlene Liu , "Mario Limonciello" , Alex Deucher , , Wayne Lin Subject: [PATCH 62/74] drm/amd/display: Update DCN42B stutter latency to match DCN42 Date: Wed, 11 Nov 2026 09:29:08 +0800 Message-ID: <20261111014100.3596072-63-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261111014100.3596072-1-Wayne.Lin@amd.com> References: <20261111014100.3596072-1-Wayne.Lin@amd.com> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF0000020A:EE_|CY5PR12MB6429:EE_ X-MS-Office365-Filtering-Correlation-Id: 28507e30-9ed6-4156-b676-08df3f955bbb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|82310400026|23010399003|36860700016|261009223027099003|10067099003|261102123227099003|261021123027099003|261021121427099003|261026121527099003|56012099006|11063799006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: /lzuTzsgczFfmjCLp1OoSEcWLKacH7WE1A2EdfSwk+28kFBrQwNyjgATZO6j8+p+p/D37Z1Qc9UpYH4MGKaMUhNFKC30U+a54C+tUb4ca0ggJ2IM9IjmZk7KsctjZ30DF90YvJwUBhmSTYOR0Ls4erjvJz2CINdgJi8u92yiw1Q3A8vqfCVBjOFBpKywBPFwdLKH3nc10k4CwjdmR03DILemcJIG/qCoDQzSu1ZQGAAnVtVFNY3oh9IBYwlujDgrHocyhXgsjum2cGaPSeNJNLAiB4T8Rn5jiEb/yxZip4IHhED0hhNuID4Ci5YIzYbVZ7qC96pjGDwHaKeGr3Z/q0tAPT9OUg4BcUqA1iEtPZobp7RZEpdfEhKW7gODhSHPOLQNw0ADsNh8p/NIkn7Yonjsp/bKFd+3/EaQdWIeu3jzDWi5lkdUBC7b97SBIbtq X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2026 01:44:43.0326 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 28507e30-9ed6-4156-b676-08df3f955bbb 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF0000020A.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6429 From: Allen Pan [Why] The DCN42B stutter latencies do not match DCN42, which can lead to underflow and stutter issues. [How] Update the DCN42B LPDDR5/LPCAMM2 stutter latencies to the same values DCN42 already uses. Cc: Dillon Varone Cc: Charlene Liu Cc: Mario Limonciello Cc: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Allen Pan Signed-off-by: Wayne Lin --- .../dc/dml2_0/dml21/inc/bounding_boxes/dcn42b_soc_bb.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/inc/bounding_boxes/dcn42b_soc_bb.h b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/inc/bounding_boxes/dcn42b_soc_bb.h index e83a9ac018db..07f1bffc75ca 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/inc/bounding_boxes/dcn42b_soc_bb.h +++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/inc/bounding_boxes/dcn42b_soc_bb.h @@ -188,8 +188,8 @@ static const struct dml2_soc_bb dml2_socbb_dcn42b = { .dram_clk_change_blackout_us = 36, .fclk_change_blackout_us = 0, .g7_ppt_blackout_us = 0, - .stutter_enter_plus_exit_latency_us = 14, - .stutter_exit_latency_us = 12, + .stutter_enter_plus_exit_latency_us = 15.5, + .stutter_exit_latency_us = 13.5, .z8_stutter_enter_plus_exit_latency_us = 300, .z8_stutter_exit_latency_us = 200, }, -- 2.43.0