[media] v4l: s5p-tv: mixer: fix setup of VP scaling

Adjusting of Video Processor's scaling factors was flawed. It bounded scaling
to range 1/16 to 1/1. The correct range should be 1/4 to 4/1. This patch fixes
this bug.
Signed-off-by: NTomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/s5p-tv/mixer_vp_layer.c

@@ -172,10 +172,10 @@ static void mxr_vp_fix_geometry(struct mxr_layer *layer,
 		y_center = src->y_offset + src->height / 2;
 
 		/* ensure scaling is between 0.25x .. 16x */
-		src->width = clamp(src->width, round_up(dst->width, 4),
-			dst->width * 16);
-		src->height = clamp(src->height, round_up(dst->height, 4),
-			dst->height * 16);
+		src->width = clamp(src->width, round_up(dst->width / 16, 4),
+			dst->width * 4);
+		src->height = clamp(src->height, round_up(dst->height / 16, 4),
+			dst->height * 4);
 
 		/* hardware limits */
 		src->width = clamp(src->width, 32U, 2047U);