Introduce the `amd_pstate` driver new working mode with
`amd_pstate=passive` added to kernel command line.
If there is no passive mode enabled by user, amd_pstate driver will be
disabled by default for now.
Acked-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NGautham R. Shenoy <gautham.shenoy@amd.com>
Tested-by: NWyes Karny <wyes.karny@amd.com>
Signed-off-by: NPerry Yuan <Perry.Yuan@amd.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>