On Wed, Dec 21, 2022 at 4:52 PM Pratyush Yadav <ptyadav@xxxxxxxxx> wrote: > > When a processor is brought offline and online again, it is unable to > use Turbo mode because the _PSS table does not contain the whole turbo > frequency range, but only +1 MHz above the max non-turbo frequency. That's because of the way P-state limits in the turbo range are handled by the given processor. Some of them restrict the P-state even if the limit is located within the turbo range and some of them don't (that is, requesting any P-state in the turbo range gives the processor a license to use the whole of it). > This causes problems when ACPI processor driver tries to set frequency > constraints. The problem is that acpi_processor_get_platform_limit() sets the limit to the frequency for all of the _PSS states including the last special one and it should update the QoS to "no limit" in that case.
