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(+) -- 1.7.12.4
