cpufreq: use last policy after online for drivers with ->setpolicy
For cpufreq drivers which use setpolicy interface, after offline->online the policy is set to default. This can be reproduced by setting the default policy of intel_pstate or longrun to ondemand and then change to "performance". After offline and online, the setpolicy will be called with the policy=ondemand. For drivers using governors this condition is handled by storing last_governor, during offline and restoring during online. The same should be done for drivers using setpolicy interface. Storing last_policy during offline and restoring during online. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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