drm/amdgpu: enable athub powergating for navi12

Signed-off-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nv.c

@@ -651,7 +651,8 @@ static int nv_common_early_init(void *handle)
 			AMD_CG_SUPPORT_ATHUB_LS |
 			AMD_CG_SUPPORT_VCN_MGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_VCN |
-			AMD_PG_SUPPORT_VCN_DPG;
+			AMD_PG_SUPPORT_VCN_DPG |
+			AMD_PG_SUPPORT_ATHUB;
 		adev->external_rev_id = adev->rev_id + 0xa;
 		break;
 	default: