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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>
This commit is contained in:
Stylon Wang 2022-11-15 20:10:05 +08:00 committed by Alex Deucher
parent bb622e0c00
commit 7a259c6df9
1 changed files with 22 additions and 1 deletions
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23
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -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