drm/vc4: Hook up plane prepare_fb to lookup dma-buf reservations.

This way drm_atomic_helper_wait_for_fences() will actually do something. The vc4_seqno_cb has been doing the fence waits on V3D manually, so far. Signed-off-by: Eric Anholt <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Acked-by: Daniel Vetter <[email protected]> Reviewed-by: Boris Brezillon <[email protected]>
kyagi · Jun 22, 2017 · 334dbd6 · 334dbd6
1 parent 7d2818f
commit 334dbd6
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -759,9 +759,26 @@ void vc4_plane_async_set_fb(struct drm_plane *plane, struct drm_framebuffer *fb)
 	vc4_state->dlist[vc4_state->ptr0_offset] = addr;
 }
 
+static int vc4_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *state)
+{
+	struct vc4_bo *bo;
+	struct dma_fence *fence;
+
+	if ((plane->state->fb == state->fb) || !state->fb)
+		return 0;
+
+	bo = to_vc4_bo(&drm_fb_cma_get_gem_obj(state->fb, 0)->base);
+	fence = reservation_object_get_excl_rcu(bo->resv);
+	drm_atomic_set_fence_for_plane(state, fence);
+
+	return 0;
+}
+
 static const struct drm_plane_helper_funcs vc4_plane_helper_funcs = {
 	.atomic_check = vc4_plane_atomic_check,
 	.atomic_update = vc4_plane_atomic_update,
+	.prepare_fb = vc4_prepare_fb,
 };
 
 static void vc4_plane_destroy(struct drm_plane *plane)