[Bug 100761] `radeon_ib_ring_tests` takes 0.5 s on resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100761

--- Comment #5 from Christian König <deathsimple at vodafone.de> ---
What I've forgot: One thing that could possible help would be an HDP flush
directly before we wait for the fence.

Just in case the value written for the fence is stuck in the HDP (unlikely, but
worth a try).

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