On Tue, Dec 27 2022, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > When _PPC returns 0, it means that the CPU frequency is not limited by > the platform firmware, so make acpi_processor_get_platform_limit() > update the frequency QoS request used by it to "no limit" in that case > and avoid updating the QoS request when the _PPC return value has not > changed. > > This addresses a problem with limiting CPU frequency artificially on > some systems after CPU offline/online to the frequency that corresponds > to the first entry in the _PSS return package. > > While at it, move the _PPC return value check against the state count > earlier to avoid setting performance_platform_limit to an invalid value. > > Reported-by: Pratyush Yadav <ptyadav@xxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Tested-by: Pratyush Yadav <ptyadav@xxxxxxxxx> -- Regards, Pratyush Yadav Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879
