drm/amd/display: add new dc debug structure to track debug data

[why]
Some DTN tests still failing @ 2%  Need to reduce.

[how]
add instrumentation code to driver so we can get more information from failed runs.

Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 54e396452345..701a882505e9 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1028,6 +1028,9 @@ enum link_training_result dc_link_dp_perform_link_training(
                         lt_settings.lane_settings[0].VOLTAGE_SWING,
                         lt_settings.lane_settings[0].PRE_EMPHASIS);
 
+        if (status != LINK_TRAINING_SUCCESS)
+                link->ctx->dc->debug.debug_data.ltFailCount++;
+
         return status;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 85f5ddded418..f74ad8e3fd4e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -259,6 +259,11 @@ struct dc_debug {
         bool scl_reset_length10;
         bool hdmi20_disable;
 
+        struct {
+                uint32_t ltFailCount;
+                uint32_t i2cErrorCount;
+                uint32_t auxErrorCount;
+        } debug_data;
 };
 struct dc_state;
 struct resource_pool;