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Tue, 5 Oct 2021 02:54:09 -0500 From: Wayne Lin To: CC: , , , , , , , , , Jimmy Kizito , Jun Lei , Wayne Lin Subject: [PATCH v2 07/23] drm/amd/display: Update training parameters for DPIA links Date: Tue, 5 Oct 2021 15:51:49 +0800 Message-ID: <20211005075205.3467938-8-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211005075205.3467938-1-Wayne.Lin@amd.com> References: <20211005075205.3467938-1-Wayne.Lin@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: dd3cabfd-2e15-49ec-4384-08d987d55873 X-MS-TrafficTypeDiagnostic: DM6PR12MB4043: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:454; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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:(4636009)(36840700001)(46966006)(47076005)(81166007)(54906003)(7696005)(2906002)(26005)(36860700001)(356005)(36756003)(82310400003)(186003)(8676002)(316002)(2616005)(508600001)(6666004)(70206006)(6916009)(83380400001)(70586007)(8936002)(1076003)(86362001)(15650500001)(4326008)(5660300002)(426003)(336012)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2021 07:54:23.0509 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dd3cabfd-2e15-49ec-4384-08d987d55873 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: DM6NAM11FT034.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4043 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: Jimmy Kizito [why & how] Add codes for commit "ede4f6dac99e drm/amd/display: Update setting of DP training parameters." to support USB4 DP tunneling feature Reviewed-by: Jun Lei Acked-by: Wayne Lin Acked-by: Nicholas Kazlauskas Signed-off-by: Jimmy Kizito --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 +++++++ 1 file changed, 7 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 9bc5f49ea2ec..dd1d0262ba40 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 @@ -1777,6 +1777,13 @@ static enum dc_status configure_lttpr_mode_non_transparent( if (encoding == DP_8b_10b_ENCODING) { repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt); + + /* Driver does not need to train the first hop. Skip DPCD read and clear + * AUX_RD_INTERVAL for DPTX-to-DPIA hop. + */ + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + link->dpcd_caps.lttpr_caps.aux_rd_interval[--repeater_cnt] = 0; + for (repeater_id = repeater_cnt; repeater_id > 0; repeater_id--) { aux_interval_address = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1 + ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (repeater_id - 1)); -- 2.25.1