5563dfabc8
The normal drawing path does this, and it's necessary on Ivybridge, so let's try it on Sandybridge too. It's not explicitly documented as necessary, but might help with hangs. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Tested-by: Xinkai Chen <yeled.nova@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Cc: "9.2" <mesa-stable@lists.freedesktop.org>