[PATCH 18/36] drm/amd/display: write all 4 bytes of FFE_PRESET dpcd value

[Hamza Mahfooz <hamza.mahfooz@xxxxxxx>]

From: Wenjing Liu <wenjing.liu@xxxxxxx>

[why]
According to specs, it expects us to write all 4 bytes even if
current lane count is less than 4.

Reviewed-by: George Shen <George.Shen@xxxxxxx>
Acked-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Wenjing Liu <wenjing.liu@xxxxxxx>
---
 .../gpu/drm/amd/display/dc/core/dc_link_dp.c  | 37 +++++++++----------
 1 file changed, 18 insertions(+), 19 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 4ea8acb16161..c4acadba78d6 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
@@ -944,6 +944,23 @@ enum dc_status dp_get_lane_status_and_lane_adjust(
 	return status;
 }
 
+static enum dc_status dpcd_128b_132b_set_lane_settings(
+		struct dc_link *link,
+		const struct link_training_settings *link_training_setting)
+{
+	enum dc_status status = core_link_write_dpcd(link,
+			DP_TRAINING_LANE0_SET,
+			(uint8_t *)(link_training_setting->dpcd_lane_settings),
+			sizeof(link_training_setting->dpcd_lane_settings));
+
+	DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X TX_FFE_PRESET_VALUE = %x\n",
+			__func__,
+			DP_TRAINING_LANE0_SET,
+			link_training_setting->dpcd_lane_settings[0].tx_ffe.PRESET_VALUE);
+	return status;
+}
+
+
 enum dc_status dpcd_set_lane_settings(
 	struct dc_link *link,
 	const struct link_training_settings *link_training_setting,
@@ -964,16 +981,6 @@ enum dc_status dpcd_set_lane_settings(
 		link_training_setting->link_settings.lane_count);
 
 	if (is_repeater(link_training_setting, offset)) {
-		if (dp_get_link_encoding_format(&link_training_setting->link_settings) ==
-				DP_128b_132b_ENCODING)
-			DC_LOG_HW_LINK_TRAINING("%s:\n LTTPR Repeater ID: %d\n"
-					" 0x%X TX_FFE_PRESET_VALUE = %x\n",
-					__func__,
-					offset,
-					lane0_set_address,
-					link_training_setting->dpcd_lane_settings[0].tx_ffe.PRESET_VALUE);
-		else if (dp_get_link_encoding_format(&link_training_setting->link_settings) ==
-				DP_8b_10b_ENCODING)
 		DC_LOG_HW_LINK_TRAINING("%s\n LTTPR Repeater ID: %d\n"
 				" 0x%X VS set = %x  PE set = %x max VS Reached = %x  max PE Reached = %x\n",
 			__func__,
@@ -985,14 +992,6 @@ enum dc_status dpcd_set_lane_settings(
 			link_training_setting->dpcd_lane_settings[0].bits.MAX_PRE_EMPHASIS_REACHED);
 
 	} else {
-		if (dp_get_link_encoding_format(&link_training_setting->link_settings) ==
-				DP_128b_132b_ENCODING)
-			DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X TX_FFE_PRESET_VALUE = %x\n",
-					__func__,
-					lane0_set_address,
-					link_training_setting->dpcd_lane_settings[0].tx_ffe.PRESET_VALUE);
-		else if (dp_get_link_encoding_format(&link_training_setting->link_settings) ==
-				DP_8b_10b_ENCODING)
 		DC_LOG_HW_LINK_TRAINING("%s\n 0x%X VS set = %x  PE set = %x max VS Reached = %x  max PE Reached = %x\n",
 			__func__,
 			lane0_set_address,
@@ -2023,7 +2022,7 @@ static enum link_training_result dp_perform_128b_132b_channel_eq_done_sequence(
 			result = DP_128b_132b_LT_FAILED;
 		} else {
 			dp_set_hw_lane_settings(link, link_res, lt_settings, DPRX);
-			dpcd_set_lane_settings(link, lt_settings, DPRX);
+			dpcd_128b_132b_set_lane_settings(link, lt_settings);
 		}
 		loop_count++;
 	}
-- 
2.37.2