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CAT:NONE; SFS:(4636009)(36840700001)(46966006)(47076005)(5660300002)(4326008)(54906003)(6916009)(508600001)(83380400001)(316002)(356005)(70586007)(8676002)(2906002)(8936002)(336012)(86362001)(70206006)(36860700001)(1076003)(6666004)(2616005)(36756003)(186003)(82310400004)(81166007)(26005)(426003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Nov 2021 19:49:43.7441 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 86a8af0e-37e4-492c-c149-08d9b115e4b3 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT065.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB2819 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: , Cc: stylon.wang@amd.com, Jun Lei , solomon.chiu@amd.com, Sunpeng.Li@amd.com, Harry.Wentland@amd.com, qingqing.zhuo@amd.com, George Shen , Rodrigo.Siqueira@amd.com, roman.li@amd.com, Anson.Jacob@amd.com, Aurabindo.Pillai@amd.com, wayne.lin@amd.com, mikita.lipski@amd.com, Bhawanpreet.Lakha@amd.com, agustin.gutierrez@amd.com, pavle.kotarac@amd.com Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: George Shen [Why] Certain display configurations require an extra delay before reading lane status with certain LTTPR. [How] Add temporary workaround to force AUX RD interval to 16ms for CR and EQ. Needs to be refactored later. Reviewed-by: Jun Lei Acked-by: Bhawanpreet Lakha Signed-off-by: George Shen --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 026ce0839719..28baa84102da 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1384,6 +1384,12 @@ static enum link_training_result perform_channel_equalization_sequence( dp_translate_training_aux_read_interval( link->dpcd_caps.lttpr_caps.aux_rd_interval[offset - 1]); + if (link->dc->debug.apply_vendor_specific_lttpr_wa && + (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && + link->lttpr_mode == LTTPR_MODE_TRANSPARENT) { + wait_time_microsec = 16000; + } + dp_wait_for_training_aux_rd_interval( link, wait_time_microsec); @@ -1487,6 +1493,12 @@ static enum link_training_result perform_clock_recovery_sequence( if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) wait_time_microsec = TRAINING_AUX_RD_INTERVAL; + if (link->dc->debug.apply_vendor_specific_lttpr_wa && + (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && + link->lttpr_mode == LTTPR_MODE_TRANSPARENT) { + wait_time_microsec = 16000; + } + dp_wait_for_training_aux_rd_interval( link, wait_time_microsec); -- 2.25.1