diff options
| author | David Francis <David.Francis@amd.com> | 2019-03-05 10:04:15 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-03-20 23:39:49 -0500 |
| commit | f258fee6c3c076a406be3388d4099f1b1a45b39c (patch) | |
| tree | 795f10b8a4f51ef25da1d4515189c75426496f69 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | |
| parent | c7ba3653e9773256b2b08508a2ed2ca28ea7566b (diff) | |
drm/amd/display: Add debugfs dpcd interface
[Why]
We need arbitrary read/write over DP AUX DPCD
for debugging
[How]
Three debugfs entries
Set the target address by writing to
"aux_dpcd_address"
(The first four bytes written are used)
Set the transaction size in bytes by writing to
"aux_dpcd_size"
(The first four bytes written are used)
Start a transaction by reading/writing
"aux_dpcd_data"
Do note: there is no concerrency protection at all
Accessing these entries in quick succession can lead
to strange behaviour
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 8b5fc420d1c1..ef247831bab6 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4395,6 +4395,8 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm, DRM_ERROR("Failed to create debugfs for connector"); goto out_free; } + aconnector->debugfs_dpcd_address = 0; + aconnector->debugfs_dpcd_size = 0; #endif if (connector_type == DRM_MODE_CONNECTOR_DisplayPort |