drm/qxl: move shadow handling to new qxl_prepare_shadow()

Pure code motion, no functional change.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20210217123213.2199186-10-kraxel@redhat.com

drivers/gpu/drm/qxl/qxl_display.c

@@ -771,23 +771,12 @@ static void qxl_calc_dumb_shadow(struct qxl_device *qdev,
 		DRM_DEBUG("%dx%d\n", surf->width, surf->height);
 }
 
-static int qxl_plane_prepare_fb(struct drm_plane *plane,
-				struct drm_plane_state *new_state)
+static void qxl_prepare_shadow(struct qxl_device *qdev, struct qxl_bo *user_bo,
+			       int crtc_index)
 {
-	struct qxl_device *qdev = to_qxl(plane->dev);
-	struct drm_gem_object *obj;
-	struct qxl_bo *user_bo;
 	struct qxl_surface surf;
 
-	if (!new_state->fb)
-		return 0;
-
-	obj = new_state->fb->obj[0];
-	user_bo = gem_to_qxl_bo(obj);
-
-	if (plane->type == DRM_PLANE_TYPE_PRIMARY &&
-	    user_bo->is_dumb) {
-		qxl_update_dumb_head(qdev, new_state->crtc->index,
+	qxl_update_dumb_head(qdev, crtc_index,
 			     user_bo);
 	qxl_calc_dumb_shadow(qdev, &surf);
 	if (!qdev->dumb_shadow_bo ||
@@ -813,6 +802,24 @@ static int qxl_plane_prepare_fb(struct drm_plane *plane,
 		user_bo->shadow = qdev->dumb_shadow_bo;
 		qxl_bo_pin(user_bo->shadow);
 	}
+}
+
+static int qxl_plane_prepare_fb(struct drm_plane *plane,
+				struct drm_plane_state *new_state)
+{
+	struct qxl_device *qdev = to_qxl(plane->dev);
+	struct drm_gem_object *obj;
+	struct qxl_bo *user_bo;
+
+	if (!new_state->fb)
+		return 0;
+
+	obj = new_state->fb->obj[0];
+	user_bo = gem_to_qxl_bo(obj);
+
+	if (plane->type == DRM_PLANE_TYPE_PRIMARY &&
+	    user_bo->is_dumb) {
+		qxl_prepare_shadow(qdev, user_bo, new_state->crtc->index);
 	}
 
 	return qxl_bo_pin(user_bo);