drm/mali-dp: Don't enable scaling engine for planes that only rotate.

Currently the scaling engine gets enabled for a plane where the input
size differs from the composition size. As rotation is done natively
by the plane's hardware layer, we don't need the scaling engine to be
enabled.

Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/malidp_planes.c

@@ -154,8 +154,14 @@ static int malidp_se_check_scaling(struct malidp_plane *mp,
 	if (ret)
 		return ret;
 
-	src_w = state->src_w >> 16;
-	src_h = state->src_h >> 16;
+	if (state->rotation & MALIDP_ROTATED_MASK) {
+		src_w = state->src_h >> 16;
+		src_h = state->src_w >> 16;
+	} else {
+		src_w = state->src_w >> 16;
+		src_h = state->src_h >> 16;
+	}
+
 	if ((state->crtc_w == src_w) && (state->crtc_h == src_h)) {
 		/* Scaling not necessary for this plane. */
 		mc->scaled_planes_mask &= ~(mp->layer->id);