[PATCH 07/10] drm/amd/display: add new dc debug structure to track debug data

[sunpeng.li at amd.com]

From: Jun Lei <Jun.Lei at amd.com>

[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.

Change-Id: I6c4ead8e28100cbe951a06dcde85dd6dbd5aa321
Signed-off-by: Jun Lei <Jun.Lei at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.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(+)

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 49f465e..00cab78 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 85f5ddd..f74ad8e 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;
-- 
2.7.4