FORCEWAKE_KERNEL_FALLBACK
wait_ack_clear(i915, d, FORCEWAKE_KERNEL_FALLBACK);
_MASKED_BIT_ENABLE(FORCEWAKE_KERNEL_FALLBACK));
wait_ack_set(i915, d, FORCEWAKE_KERNEL_FALLBACK);
_MASKED_BIT_DISABLE(FORCEWAKE_KERNEL_FALLBACK));