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drm/radeon/cik: use WAIT_REG_MEM special op for CP HDP flush
authorAlex Deucher <alexander.deucher@amd.com>
Thu, 9 Jan 2014 21:51:56 +0000 (16:51 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Mon, 20 Jan 2014 17:05:15 +0000 (12:05 -0500)
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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