drm/amdgpu: Add cmd to control XGMI link sleep
Added host to SMU FW cmd to enable/disable XGMI link power down Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: NJohn Clements <john.clements@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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