We're really supposed to do this to avoid trouble with underflows when
multiple planes are active.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=26987.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Nfangxun <xunx.fang@intel.com>
Signed-off-by: NEric Anholt <eric@anholt.net>