WIP: drm/meson: overlay: fix OSD position during scaling on GXL/GXM

Playing media with a resolution smaller than the crtc size requires the
media to be scaled for output. Current calculations scale correctly but
position the media incorrectly resulting in solid pink 1px line on the
bottom of the media. Fix the overlay calculations to correctly position
media and eliminate the line.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>

drivers/gpu/drm/meson/meson_overlay.c

@@ -323,10 +323,10 @@ static void meson_overlay_setup_scaler_params(struct meson_drm *priv,
 	}
 
 	vsc_startp = max_t(int, start,
-			   max_t(int, 0, video_top));
+			   max_t(int, 0, video_top + 1));
 	vsc_endp = min_t(int, end,
-			 min_t(int, crtc_height - 1,
-			       video_top + video_height - 1));
+			 min_t(int, crtc_height,
+			       video_top + video_height + 1));
 
 	DRM_DEBUG("vsc startp %d endp %d start_lines %d end_lines %d\n",
 		 vsc_startp, vsc_endp, vd_start_lines, vd_end_lines);