From: Helen Koike <helen.koike@xxxxxxxxxxxxx>
commit c16b85559dcfb5a348cc085a7b4c75ed49b05e2c upstream.
Async update callbacks are expected to set the old_fb in the new_state
so prepare/cleanup framebuffers are balanced.
Calling drm_atomic_set_fb_for_plane() (which gets a reference of the new
fb and put the old fb) is not required, as it's taken care by
drm_mode_cursor_universal() when calling drm_atomic_helper_update_plane().
Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
Fixes: 539c320bfa97 ("drm/vc4: update cursors asynchronously through atomic")
Suggested-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603165610.24614-5-helen.koike@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_plane.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -818,6 +818,7 @@ static void vc4_plane_atomic_async_updat
drm_atomic_set_fb_for_plane(plane->state, state->fb);
}
+ swap(plane->state->fb, state->fb);
/* Set the cursor's position on the screen. This is the
* expected change from the drm_mode_cursor_universal()
* helper.
