drm/amdgpu: fix to disable powergating in hw_fini
We need enable CGPG and GFXOFF together. If only enable one of them, this system will get hang after startx (do draw command). So when gfxoff is disabled, it also need disable CGPG after that. Signed-off-by: NHuang Rui <ray.huang@amd.com> Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Acked-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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