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This restriction carries forward from earlier platforms. The code is ported straight from gen7_wm_state.c. v2: Actually do it right. v3: Add missing _NEW_MULTISAMPLE bit (caught by Eric). Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>