drm/amd/display: fix recout calculation for left side clip

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@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -823,6 +823,8 @@ 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;
@@ -831,6 +833,8 @@ 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)