drm/vc4: Allow scaling on cursor plane

Now that async update has been reworked to allow scaled planes to be
updated asynchronously when the scaling params do not change, we can
remove the NO_SCALING constraint on cursor planes.
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: NEric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181130090254.594-5-boris.brezillon@bootlin.com

drivers/gpu/drm/vc4/vc4_plane.c

@@ -260,14 +260,12 @@ static u32 vc4_get_scl_field(struct drm_plane_state *state, int plane)
 
 static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
 {
-	struct drm_plane *plane = state->plane;
 	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
 	struct drm_framebuffer *fb = state->fb;
 	struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
 	u32 subpixel_src_mask = (1 << 16) - 1;
 	u32 format = fb->format->format;
 	int num_planes = fb->format->num_planes;
-	int min_scale = 1, max_scale = INT_MAX;
 	struct drm_crtc_state *crtc_state;
 	u32 h_subsample, v_subsample;
 	int i, ret;
@@ -279,21 +277,8 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
 		return -EINVAL;
 	}
 
-	/* No configuring scaling on the cursor plane, since it gets
-	 * non-vblank-synced updates, and scaling requires LBM changes which
-	 * have to be vblank-synced.
-	 */
-	if (plane->type == DRM_PLANE_TYPE_CURSOR) {
-		min_scale = DRM_PLANE_HELPER_NO_SCALING;
-		max_scale = DRM_PLANE_HELPER_NO_SCALING;
-	} else {
-		min_scale = 1;
-		max_scale = INT_MAX;
-	}
-
-	ret = drm_atomic_helper_check_plane_state(state, crtc_state,
-						  min_scale, max_scale,
-						  true, true);
+	ret = drm_atomic_helper_check_plane_state(state, crtc_state, 1,
+						  INT_MAX, true, true);
 	if (ret)
 		return ret;