[PATCH v2 0/2] Work around for Hisilicon CPPC cpufreq

From: Xiongfeng Wang
Date: Thu Feb 14 2019 - 02:47:03 EST

Hisilicon chips do not support delivered performance counter register
and reference performance counter register. But the platform can
calculate the real performance using its own method. This patch provide
a workaround for this problem, and other platforms can also use this
workaround framework. We reuse the desired performance register to
store the real performance calculated by the platform. After the
platform finished the frequency adjust, it gets the real performance and
writes it into desired performance register. OS can use it to calculate
the real frequency.

Xiongfeng Wang (2):
ACPI / CPPC: Add a helper to get desired performance
cpufreq / cppc: Work around for Hisilicon CPPC cpufreq

drivers/acpi/cppc_acpi.c | 38 +++++++++++++++++++++++
drivers/cpufreq/cppc_cpufreq.c | 70 ++++++++++++++++++++++++++++++++++++++++++
include/acpi/cppc_acpi.h | 1 +
3 files changed, 109 insertions(+)