drm/amd/display: Add ability to set preferred link training parameters.

[WHY]
To add support for OS requirement to set preferred link training
parameters.

[HOW]
Create new structure of dp link training overrides. During link training
processes, these values should be used instead of the default training
parameters.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/include/link_service_types.h

@@ -71,14 +71,17 @@ enum link_training_result {
 struct link_training_settings {
 	struct dc_link_settings link_settings;
 	struct dc_lane_settings lane_settings[LANE_COUNT_DP_MAX];
-	bool allow_invalid_msa_timing_param;
-};
 
-enum hw_dp_training_pattern {
-	HW_DP_TRAINING_PATTERN_1 = 0,
-	HW_DP_TRAINING_PATTERN_2,
-	HW_DP_TRAINING_PATTERN_3,
-	HW_DP_TRAINING_PATTERN_4
+	enum dc_voltage_swing *voltage_swing;
+	enum dc_pre_emphasis *pre_emphasis;
+	enum dc_post_cursor2 *post_cursor2;
+
+	uint16_t cr_pattern_time;
+	uint16_t eq_pattern_time;
+	enum dc_dp_training_pattern pattern_for_eq;
+
+	bool enhanced_framing;
+	bool allow_invalid_msa_timing_param;
 };
 
 /*TODO: Move this enum test harness*/