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Fri, 15 Jul 2022 13:17:23 -0500 From: Rodrigo Siqueira To: Subject: [PATCH 06/31] drm/amd/display: Add is_mst_connector debugfs entry Date: Fri, 15 Jul 2022 14:16:40 -0400 Message-ID: <20220715181705.1030401-7-Rodrigo.Siqueira@amd.com> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220715181705.1030401-1-Rodrigo.Siqueira@amd.com> References: <20220715181705.1030401-1-Rodrigo.Siqueira@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: 249f3af4-6a27-4550-0aad-08da668e47d6 X-MS-TrafficTypeDiagnostic: DM6PR12MB4604:EE_ 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:SATLEXMB03.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230016)(4636009)(346002)(376002)(39860400002)(396003)(136003)(36840700001)(46966006)(40470700004)(54906003)(478600001)(45080400002)(6916009)(81166007)(36756003)(4326008)(316002)(186003)(82740400003)(2616005)(6666004)(41300700001)(26005)(426003)(70586007)(1076003)(8676002)(86362001)(70206006)(5660300002)(336012)(40480700001)(2906002)(8936002)(82310400005)(36860700001)(356005)(83380400001)(47076005)(40460700003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2022 18:17:30.1070 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 249f3af4-6a27-4550-0aad-08da668e47d6 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: CO1NAM11FT036.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4604 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, Alan Liu , Sunpeng.Li@amd.com, Harry.Wentland@amd.com, qingqing.zhuo@amd.com, Rodrigo.Siqueira@amd.com, roman.li@amd.com, solomon.chiu@amd.com, Aurabindo.Pillai@amd.com, Hersen Wu , Wayne Lin , Bhawanpreet.Lakha@amd.com, agustin.gutierrez@amd.com, pavle.kotarac@amd.com Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Wayne Lin [Why & How] Add "is_mst_connector" debugfs entry to help distinguish whether a connector is in a mst topology or not. Access it with the following command: cat /sys/kernel/debug/dri/0/DP-X/is_mst_connector Result: - "root" stands for the root connector of the topology - "branch" stands for branch device of the topology - "end" stands for leaf node connector of the topology - "no" stands for the connector is not a device of a mst topology Reviewed-by: Hersen Wu Acked-by: Alan Liu Signed-off-by: Wayne Lin --- .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 53 +++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index b764198eca5c..991e58a3a78c 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -2557,6 +2557,57 @@ static int target_backlight_show(struct seq_file *m, void *unused) return 0; } +/* + * function description: Determine if the connector is mst connector + * + * This function helps to determine whether a connector is a mst connector. + * - "root" stands for the root connector of the topology + * - "branch" stands for branch device of the topology + * - "end" stands for leaf node connector of the topology + * - "no" stands for the connector is not a device of a mst topology + * Access it with the following command: + * + * cat /sys/kernel/debug/dri/0/DP-X/is_mst_connector + * + */ +static int dp_is_mst_connector_show(struct seq_file *m, void *unused) +{ + struct drm_connector *connector = m->private; + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); + struct drm_dp_mst_topology_mgr *mgr = NULL; + struct drm_dp_mst_port *port = NULL; + char *role = NULL; + + mutex_lock(&aconnector->hpd_lock); + + if (aconnector->mst_mgr.mst_state) { + role = "root"; + } else if (aconnector->mst_port && + aconnector->mst_port->mst_mgr.mst_state) { + + role = "end"; + + mgr = &aconnector->mst_port->mst_mgr; + port = aconnector->port; + + drm_modeset_lock(&mgr->base.lock, NULL); + if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING && + port->mcs) + role = "branch"; + drm_modeset_unlock(&mgr->base.lock); + + } else { + role = "no"; + } + + seq_printf(m, "%s\n", role); + + mutex_unlock(&aconnector->hpd_lock); + + return 0; +} + + DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support); DEFINE_SHOW_ATTRIBUTE(dmub_fw_state); DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer); @@ -2567,6 +2618,7 @@ DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability); #endif DEFINE_SHOW_ATTRIBUTE(internal_display); DEFINE_SHOW_ATTRIBUTE(psr_capability); +DEFINE_SHOW_ATTRIBUTE(dp_is_mst_connector); static const struct file_operations dp_dsc_clock_en_debugfs_fops = { .owner = THIS_MODULE, @@ -2710,6 +2762,7 @@ static const struct { {"dp_dsc_fec_support", &dp_dsc_fec_support_fops}, {"max_bpc", &dp_max_bpc_debugfs_fops}, {"dsc_disable_passthrough", &dp_dsc_disable_passthrough_debugfs_fops}, + {"is_mst_connector", &dp_is_mst_connector_fops} }; #ifdef CONFIG_DRM_AMD_DC_HDCP -- 2.37.0