From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Mon, 29 Jan 2018 16:34:16 -0500
Subject: drm/amd/display: disable seamless vp adjustment for mirrored surface
Git-commit: 4ee778dcc16b0ebbd4370a6de79c10bd88c89328
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@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_resource.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -696,7 +696,7 @@ static void calculate_inits_and_adj_vp(s
 
 
 	/* Adjust for viewport end clip-off */
-	if ((data->viewport.x + data->viewport.width) < (src.x + src.width)) {
+	if ((data->viewport.x + data->viewport.width) < (src.x + src.width) && !flip_horz_scan_dir) {
 		int vp_clip = src.x + src.width - data->viewport.width - data->viewport.x;
 		int int_part = dal_fixed31_32_floor(
 				dal_fixed31_32_sub(data->inits.h, data->ratios.horz));
@@ -704,7 +704,7 @@ static void calculate_inits_and_adj_vp(s
 		int_part = int_part > 0 ? int_part : 0;
 		data->viewport.width += int_part < vp_clip ? int_part : vp_clip;
 	}
-	if ((data->viewport.y + data->viewport.height) < (src.y + src.height)) {
+	if ((data->viewport.y + data->viewport.height) < (src.y + src.height) && !flip_vert_scan_dir) {
 		int vp_clip = src.y + src.height - data->viewport.height - data->viewport.y;
 		int int_part = dal_fixed31_32_floor(
 				dal_fixed31_32_sub(data->inits.v, data->ratios.vert));
@@ -712,7 +712,7 @@ static void calculate_inits_and_adj_vp(s
 		int_part = int_part > 0 ? int_part : 0;
 		data->viewport.height += int_part < vp_clip ? int_part : vp_clip;
 	}
-	if ((data->viewport_c.x + data->viewport_c.width) < (src.x + src.width) / vpc_div) {
+	if ((data->viewport_c.x + data->viewport_c.width) < (src.x + src.width) / vpc_div && !flip_horz_scan_dir) {
 		int vp_clip = (src.x + src.width) / vpc_div -
 				data->viewport_c.width - data->viewport_c.x;
 		int int_part = dal_fixed31_32_floor(
@@ -721,7 +721,7 @@ static void calculate_inits_and_adj_vp(s
 		int_part = int_part > 0 ? int_part : 0;
 		data->viewport_c.width += int_part < vp_clip ? int_part : vp_clip;
 	}
-	if ((data->viewport_c.y + data->viewport_c.height) < (src.y + src.height) / vpc_div) {
+	if ((data->viewport_c.y + data->viewport_c.height) < (src.y + src.height) / vpc_div && !flip_vert_scan_dir) {
 		int vp_clip = (src.y + src.height) / vpc_div -
 				data->viewport_c.height - data->viewport_c.y;
 		int int_part = dal_fixed31_32_floor(