diff options
| author | Stylon Wang <stylon.wang@amd.com> | 2022-11-15 20:10:05 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-11-29 11:03:38 -0500 |
| commit | 7a259c6df9010fb9508dcbf34a3f5f16993ca37b (patch) | |
| tree | 511f4e5a406d7f9cc6152dec1203f2e5981617fb /drivers | |
| parent | bb622e0c004404b6131633faa6bd8c4939b1df42 (diff) | |
| download | linux-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.c | 23 |
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 |