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| author | Wayne Lin <Wayne.Lin@amd.com> | 2021-08-17 18:58:31 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-07-20 16:04:39 -0400 |
| commit | 8b076fa7c5befd1d3e1d892ae466f5334e4c6c99 (patch) | |
| tree | de00b0db3397481e30b7e41a85e37e9785e56184 /drivers/gpu/drm/amd | |
| parent | c8a58ce18ca36b62749e326411176554462a5e2c (diff) | |
| download | linux-8b076fa7c5befd1d3e1d892ae466f5334e4c6c99.tar.bz2 | |
drm/amd/display: Add is_mst_connector debugfs entry
[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
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 53 |
1 files changed, 53 insertions, 0 deletions
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 e0ea350784e3..4eecf052d08d 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 @@ -2540,6 +2540,57 @@ 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); @@ -2549,6 +2600,7 @@ 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, @@ -2692,6 +2744,7 @@ 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 |