From: Jun Lei <Jun.Lei@amd.com>
Date: Fri, 22 Jun 2018 16:51:47 -0400
Subject: drm/amd/display: add new dc debug structure to track debug data
Git-commit: d6e75df4e5e10362a140c5c6ce8ced3612296ae3
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

[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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c |    3 +++
 drivers/gpu/drm/amd/display/dc/dc.h              |    5 +++++
 2 files changed, 8 insertions(+)

--- 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_per
 			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;
 }
 
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -260,6 +260,11 @@ 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;