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Fri, 2 Oct 2026 14:33:14 -0500 From: To: CC: Harry Wentland , Leo Li , Roman Li , Wayne Lin , Tom Chung , Fangzhi Zuo , Dan Wheeler , Ray Wu , Ivan Lipski , Alex Hung , James Lin , Chenyu Chen , Relja Vojvodic , Chris Park Subject: [PATCH 11/17] drm/amd/display: Update link training no timeout behaviour on HDMI Date: Fri, 2 Oct 2026 15:32:34 -0400 Message-ID: <20261002193240.3441018-12-Roman.Li@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261002193240.3441018-1-Roman.Li@amd.com> References: <20261002193240.3441018-1-Roman.Li@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000147:EE_|DS4PR12MB9707:EE_ X-MS-Office365-Filtering-Correlation-Id: 81f8b16c-735e-41a1-e2ee-08df20bc0363 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|36860700016|23010399003|82310400026|376014|22082099003|18002099003|6133799003|11063799006|3023799007|10067099003|56012099006; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: aDUqnBLX3qsmq2QR4b0FubY/bEC/tooXFhZFDIHbuRUKZv9szx6XLckiUsC/mTEbu2wUx50dPv7x9ieTcQuc33nSkJNNtD+mnDu52hStcD2UJEpl9EBcwgDGiSfT7J0AcHz9PNW9GjO2aVh9fugXiQfHn4kDlDY1TOnbLkJCj14DM3f9jpph6JXv04P/nWJ4pQdRZXNOd0zStHFTkr88g9OhoWB4TA7220Y3AAyia3Zsgy/1FX6mk9nvZzhRpnCSL/9Oaw/lqrvhf06YyPW1232iVxmekpoQMzMuKZKuufNmV7bMiQa5DvZgzB4KU0OHR8PT9Lls3lu/lbJNi6E9lKhEjHgDqmX1V/CMfKN/DWQQUf169BEMwMLGuydWNUWDzDs/Bs0pje4ykr0jn/aPHy6IdFHKDkuiwna3uiUlBu4y7E5fohfVIZD+HcR+NyNv X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Oct 2026 19:33:19.2431 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81f8b16c-735e-41a1-e2ee-08df20bc0363 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=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000147.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS4PR12MB9707 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: Relja Vojvodic [Why & How] - HMDI link training compliance testing fails when no timeout bit is set - Update condition to skip some link training logic when no timeout is set Reviewed-by: Chris Park Signed-off-by: Relja Vojvodic Signed-off-by: Roman Li --- .../amd/display/dc/link/protocols/link_hdmi_frl.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_hdmi_frl.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_hdmi_frl.c index 2f1b8c0bc8f8..5e0979ac3dcf 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_hdmi_frl.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_hdmi_frl.c @@ -561,6 +561,16 @@ static enum link_result hdmi_frl_perform_link_training(struct ddc_service *ddc_s prev_flt_update = scdc_update.fields.FLT_UPDATE; } + if (flt_no_timeout) { + offset = HDMI_SCDC_SOURCE_TEST_REQ; + link_query_ddc_data(ddc_service, slave_address, &offset, + sizeof(offset), &test_req.byte, sizeof(test_req.byte)); + if (test_req.fields.FLT_NO_TIMEOUT == 0) { + FRL_INFO("FRL TEST REQ: FLT_no_timeout = %d \n", test_req.fields.FLT_NO_TIMEOUT); + return LINK_RESULT_SUCCESS; + } + } + /*Set TxFFE = TxFFE0*/ /*Program FFE_Levels - scdc_config has this field at 0 */ if (override_FFE) { @@ -583,7 +593,7 @@ static enum link_result hdmi_frl_perform_link_training(struct ddc_service *ddc_s FRL_INFO("FRL LINK TRAINING: TxFFE = %d.\n", current_FFE); override_FFE = false; } - if (scdc_update.fields.FLT_UPDATE || flt_no_timeout) { + if (scdc_update.fields.FLT_UPDATE) { offset = HDMI_SCDC_LTP_REQ; link_query_ddc_data(ddc_service, slave_address, &offset, sizeof(offset), ltp_req.byte, -- 2.34.1