From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Mon, 23 Oct 2017 15:37:37 -0400
Subject: drm/amd/display: fix split recout calculation
Git-commit: 4ddd76d1ce00bb0d78e73e29fd9062ecd6bad611
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Recout split rounding code was wrong

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, 3 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -580,14 +580,12 @@ static void calculate_recout(struct pipe
 	if (pipe_ctx->top_pipe && pipe_ctx->top_pipe->plane_state ==
 		pipe_ctx->plane_state) {
 		if (stream->view_format == VIEW_3D_FORMAT_TOP_AND_BOTTOM) {
-			pipe_ctx->plane_res.scl_data.recout.height /= 2;
-			pipe_ctx->plane_res.scl_data.recout.y += pipe_ctx->plane_res.scl_data.recout.height;
 			/* Floor primary pipe, ceil 2ndary pipe */
-			pipe_ctx->plane_res.scl_data.recout.height += pipe_ctx->plane_res.scl_data.recout.height % 2;
+			pipe_ctx->plane_res.scl_data.recout.height = (pipe_ctx->plane_res.scl_data.recout.height + 1) / 2;
+			pipe_ctx->plane_res.scl_data.recout.y += pipe_ctx->plane_res.scl_data.recout.height;
 		} else {
-			pipe_ctx->plane_res.scl_data.recout.width /= 2;
+			pipe_ctx->plane_res.scl_data.recout.width = (pipe_ctx->plane_res.scl_data.recout.width + 1) / 2;
 			pipe_ctx->plane_res.scl_data.recout.x += pipe_ctx->plane_res.scl_data.recout.width;
-			pipe_ctx->plane_res.scl_data.recout.width += pipe_ctx->plane_res.scl_data.recout.width % 2;
 		}
 	} else if (pipe_ctx->bottom_pipe &&
 			pipe_ctx->bottom_pipe->plane_state == pipe_ctx->plane_state) {