drm/amdgpu: align GTT start to 4GB v2
For VCE to work properly the start of the GTT space must be aligned to a 4GB boundary. v2: add comment why we do this Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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