drm/radeon: set VM base addr using the PFP v2
Seems to make VM flushes more stable on SI and CIK. v2: only use the PFP on the GFX ring on CIK Signed-off-by: NChristian König <christian.koenig@amd.com> Cc: stable@vger.kernel.org Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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