From b2568d6834ea5b05f14bf48ec22a474c291b30f2 Mon Sep 17 00:00:00 2001 From: Rodrigo Siqueira Date: Thu, 25 Nov 2021 10:38:27 -0500 Subject: [PATCH] Documentation/gpu: Document pipe split visual confirmation Display core provides a feature that makes it easy for users to debug Pipe Split. This commit introduces how to use such a debug option. Reviewed-by: Yann Dirson Reviewed-by: Harry Wentland Signed-off-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- Documentation/gpu/amdgpu/display/dc-debug.rst | 28 +++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/Documentation/gpu/amdgpu/display/dc-debug.rst b/Documentation/gpu/amdgpu/display/dc-debug.rst index 532cbbd..6dbd21f 100644 --- a/Documentation/gpu/amdgpu/display/dc-debug.rst +++ b/Documentation/gpu/amdgpu/display/dc-debug.rst @@ -2,8 +2,18 @@ Display Core Debug tools ======================== -DC Debugfs -========== +DC Visual Confirmation +====================== + +Display core provides a feature named visual confirmation, which is a set of +bars added at the scanout time by the driver to convey some specific +information. In general, you can enable this debug option by using:: + + echo > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +Where `N` is an integer number for some specific scenarios that the developer +wants to enable, you will see some of these debug cases in the following +subsection. Multiple Planes Debug --------------------- @@ -34,3 +44,17 @@ split configuration. * There should **not** be any cursor corruption * Multiple plane **may** be briefly disabled during window transitions or resizing but should come back after the action has finished + +Pipe Split Debug +---------------- + +Sometimes we need to debug if DCN is splitting pipes correctly, and visual +confirmation is also handy for this case. Similar to the MPO case, you can use +the below command to enable visual confirmation:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +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. -- 2.7.4