drm/i915: remove pre-atomic check from SKL update_primary_plane

The comment suggests the check was there for some non-fully-atomic
case, and I couldn't find a case where we wouldn't correctly
initialize plane_state, so remove the check.

Let's leave a WARN there just in case.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3131,12 +3131,8 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 					       fb->pixel_format);
 	surf_addr = intel_plane_obj_offset(to_intel_plane(plane), obj, 0);
 
-	/*
-	 * FIXME: intel_plane_state->src, dst aren't set when transitional
-	 * update_plane helpers are called from legacy paths.
-	 * Once full atomic crtc is available, below check can be avoided.
-	 */
-	if (drm_rect_width(&plane_state->src)) {
+	WARN_ON(drm_rect_width(&plane_state->src) == 0);
+
 	scaler_id = plane_state->scaler_id;
 	src_x = plane_state->src.x1 >> 16;
 	src_y = plane_state->src.y1 >> 16;
@@ -3148,10 +3144,6 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 	dst_h = drm_rect_height(&plane_state->dst);
 
 	WARN_ON(x != src_x || y != src_y);
-	} else {
-		src_w = intel_crtc->config->pipe_src_w;
-		src_h = intel_crtc->config->pipe_src_h;
-	}
 
 	if (intel_rotation_90_or_270(rotation)) {
 		/* stride = Surface height in tiles */