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>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
index dfcec4d3e9c0..efa7a47f6b7e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
@@ -90,6 +90,13 @@ enum dc_post_cursor2 {
 	POST_CURSOR2_MAX_LEVEL = POST_CURSOR2_LEVEL3,
 };
 
+enum dc_dp_training_pattern {
+	DP_TRAINING_PATTERN_SEQUENCE_1 = 0,
+	DP_TRAINING_PATTERN_SEQUENCE_2,
+	DP_TRAINING_PATTERN_SEQUENCE_3,
+	DP_TRAINING_PATTERN_SEQUENCE_4,
+};
+
 struct dc_link_settings {
 	enum dc_lane_count lane_count;
 	enum dc_link_rate link_rate;
@@ -109,6 +116,20 @@ struct dc_link_training_settings {
 	struct dc_lane_settings lane_settings[LANE_COUNT_DP_MAX];
 };
 
+struct dc_link_training_overrides {
+	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;
+
+	enum dc_link_spread *downspread;
+	bool *alternate_scrambler_reset;
+	bool *enhanced_framing;
+	bool *fec_enable;
+};
 
 union dpcd_rev {
 	struct {