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authorStylon Wang <stylon.wang@amd.com>2022-11-15 20:10:05 +0800
committerAlex Deucher <alexander.deucher@amd.com>2022-11-29 11:03:38 -0500
commit7a259c6df9010fb9508dcbf34a3f5f16993ca37b (patch)
tree511f4e5a406d7f9cc6152dec1203f2e5981617fb /drivers
parentbb622e0c004404b6131633faa6bd8c4939b1df42 (diff)
downloadlinux-7a259c6df9010fb9508dcbf34a3f5f16993ca37b.tar.bz2
drm/amd/display: Create debugfs to tell if connector is DPIA link
[Why] Tests need to tell if display is connected via USB4 DPIA link. Currently this is only possible via analyzing dmesg logs. [How] Create a per-connector debugfs entry to report if the link is tunneled via USB4 DPIA. Reviewed-by: Wayne Lin <Wayne.Lin@amd.com> Acked-by: Jasdeep Dhillon <jdhillon@amd.com> Signed-off-by: Stylon Wang <stylon.wang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c23
1 files changed, 22 insertions, 1 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 2c43cdd2e707..461037a3dd75 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
@@ -2639,6 +2639,25 @@ static int dp_mst_progress_status_show(struct seq_file *m, void *unused)
return 0;
}
+/*
+ * Reports whether the connected display is a USB4 DPIA tunneled display
+ * Example usage: cat /sys/kernel/debug/dri/0/DP-8/is_dpia_link
+ */
+static int is_dpia_link_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+ struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+ struct dc_link *link = aconnector->dc_link;
+
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
+ seq_printf(m, "%s\n", (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) ? "yes" :
+ (link->ep_type == DISPLAY_ENDPOINT_PHY) ? "no" : "unknown");
+
+ return 0;
+}
+
DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
@@ -2650,6 +2669,7 @@ DEFINE_SHOW_ATTRIBUTE(internal_display);
DEFINE_SHOW_ATTRIBUTE(psr_capability);
DEFINE_SHOW_ATTRIBUTE(dp_is_mst_connector);
DEFINE_SHOW_ATTRIBUTE(dp_mst_progress_status);
+DEFINE_SHOW_ATTRIBUTE(is_dpia_link);
static const struct file_operations dp_dsc_clock_en_debugfs_fops = {
.owner = THIS_MODULE,
@@ -2794,7 +2814,8 @@ static const struct {
{"max_bpc", &dp_max_bpc_debugfs_fops},
{"dsc_disable_passthrough", &dp_dsc_disable_passthrough_debugfs_fops},
{"is_mst_connector", &dp_is_mst_connector_fops},
- {"mst_progress_status", &dp_mst_progress_status_fops}
+ {"mst_progress_status", &dp_mst_progress_status_fops},
+ {"is_dpia_link", &is_dpia_link_fops}
};
#ifdef CONFIG_DRM_AMD_DC_HDCP