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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>

authored by

Rodrigo Siqueira and committed by
Alex Deucher 76659755 b2568d68

+17
+17
Documentation/gpu/amdgpu/display/dc-debug.rst
··· 58 58 bottom of the display covering the entire display width and another bar 59 59 covering the second pipe. In other words, you will see a bit high bar in the 60 60 second pipe. 61 + 62 + DTN Debug 63 + ========= 64 + 65 + DC (DCN) provides an extensive log that dumps multiple details from our 66 + hardware configuration. Via debugfs, you can capture those status values by 67 + using Display Test Next (DTN) log, which can be captured via debugfs by using:: 68 + 69 + cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log 70 + 71 + Since this log is updated accordingly with DCN status, you can also follow the 72 + change in real-time by using something like:: 73 + 74 + sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log 75 + 76 + When reporting a bug related to DC, consider attaching this log before and 77 + after you reproduce the bug.