From 5d2590673f3e5c0c0ecf496fb48c73e3ee3ee573 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 9 Jan 2014 16:51:56 -0500
Subject: [PATCH] drm/radeon/cik: use WAIT_REG_MEM special op for CP HDP flush

This is the preferred flushing method on CIK.

Note, this only works on the PFP so the engine bit must be
set.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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