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drm/amd/display: Add is_mst_connector debugfs entry

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[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>
This commit is contained in:
Wayne Lin
2021-08-17 18:58:31 +08:00
committed by Alex Deucher
parent c8a58ce18c
commit 8b076fa7c5
1 changed files with 53 additions and 0 deletions
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53
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -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