drm/i915: copy staged scaler state from drm state to crtc->config.

This is required for commit to perform as per staged assignment
of scalers until atomic crtc commit function is available.

As a place holder doing this copy from intel_atomic_commit for
scaling to operate correctly.
Signed-off-by: NChandra Konduru <chandra.konduru@intel.com>
Reviewed-by: NMatt Roper <matthew.d.roper@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_atomic.c

@@ -168,6 +168,18 @@ int intel_atomic_commit(struct drm_device *dev,
 		swap(state->plane_states[i], plane->state);
 		plane->state->state = NULL;
 	}
+
+	/* swap crtc_state */
+	for (i = 0; i < dev->mode_config.num_crtc; i++) {
+		struct drm_crtc *crtc = state->crtcs[i];
+		if (!crtc) {
+			continue;
+		}
+
+		to_intel_crtc(crtc)->config->scaler_state =
+			to_intel_crtc_state(state->crtc_states[i])->scaler_state;
+	}
+
 	drm_atomic_helper_commit_planes(dev, state);
 	drm_atomic_helper_wait_for_vblanks(dev, state);
 	drm_atomic_helper_cleanup_planes(dev, state);