[0/2,RFC,v2] Update the cpuinfo.max when power supply changes

Message

Chen Yu Feb. 28, 2019, 6:06 p.m. UTC

On Dell Inc. XPS13 9333, the BIOS changes the value of
MSR_IA32_MISC_ENABLE_TURBO_DISABLE at runtime (e.g., when
the power source changes), the maximum frequency of the
CPU is not updated accordingly. This is due to the policy's
cpuinfo.max is not updated when _PPC notifier fires.

Firstly we should update the cpuinfo.max in this corner case,
secondly we should broadcast the _PPC notifier to all online
CPUs to keep information consistent.

Chen Yu (2):
  ACPI: add "processor.broadcast_ppc" hook to broadcast  _PPC
  ACPI: Update cpuinfo.max after bootup if necessary

 drivers/acpi/processor_perflib.c | 16 ++++++++++++++--
 drivers/cpufreq/cpufreq.c        |  2 ++
 drivers/cpufreq/intel_pstate.c   | 15 +++++++++++++--
 3 files changed, 29 insertions(+), 4 deletions(-)