[PATCH 25/25] drm/amd/display: fix recout calculation for left side clip

[Qingqing Zhuo]

From: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>

Recout calculation does not corrrectly handle plane
clip rect that extends beyond the left most border
of stream source rect. This change adds handling by
truncating the invisible clip rect.

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu at amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index d49a8b3e5137..998d87b852a7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -825,6 +825,8 @@ static void calculate_recout(struct pipe_ctx *pipe_ctx)
 	} else
 		data->recout.x = 0;
 
+	if (stream->src.x > surf_clip.x)
+		surf_clip.width -= stream->src.x - surf_clip.x;
 	data->recout.width = surf_clip.width * stream->dst.width / stream->src.width;
 	if (data->recout.width + data->recout.x > stream->dst.x + stream->dst.width)
 		data->recout.width = stream->dst.x + stream->dst.width - data->recout.x;
@@ -833,6 +835,8 @@ static void calculate_recout(struct pipe_ctx *pipe_ctx)
 	if (stream->src.y < surf_clip.y)
 		data->recout.y += (surf_clip.y - stream->src.y) * stream->dst.height
 						/ stream->src.height;
+	else if (stream->src.y > surf_clip.y)
+		surf_clip.height -= stream->src.y - surf_clip.y;
 
 	data->recout.height = surf_clip.height * stream->dst.height / stream->src.height;
 	if (data->recout.height + data->recout.y > stream->dst.y + stream->dst.height)
-- 
2.17.1