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Documentation/gpu: How to collect DTN log 

Introduce how to collect DTN log from debugfs.

Reviewed-by: Yann Dirson <ydirson@free.fr>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira 2021-11-25 10:38:28 -05:00 committed by Alex Deucher
parent b2568d6834
commit 76659755b4
1 changed files with 17 additions and 0 deletions
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Documentation/gpu/amdgpu/display/dc-debug.rst
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@ -58,3 +58,20 @@ In this case, if you have a pipe split, you will see one small red bar at the
bottom of the display covering the entire display width and another bar
covering the second pipe. In other words, you will see a bit high bar in the
second pipe.
DTN Debug
=========
DC (DCN) provides an extensive log that dumps multiple details from our
hardware configuration. Via debugfs, you can capture those status values by
using Display Test Next (DTN) log, which can be captured via debugfs by using::
cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
Since this log is updated accordingly with DCN status, you can also follow the
change in real-time by using something like::
sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
When reporting a bug related to DC, consider attaching this log before and
after you reproduce the bug.