[v3,0/2] Work around for Hisilicon CPPC cpufreq

Message

Xiongfeng Wang Feb. 17, 2019, 3:54 a.m. UTC

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.

Changlog:

v2 -> v3:
	Recontruct 'cppc_get_desired_perf'.
	Rename 'cppc_workaround_info' to 'cppc_workaround_oem_info'
	Drop 'get_rate' member from struct cppc_workaround_oem_info
	Change 'cppc_wa_get_rate' pointer to a flag to indicate whether
	we need to aplly the workaround.
	Move the new functions to the beginning of cppc-cpufreq.c


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       | 39 +++++++++++++++++++++++++
 drivers/cpufreq/cppc_cpufreq.c | 66 ++++++++++++++++++++++++++++++++++++++++++
 include/acpi/cppc_acpi.h       |  1 +
 3 files changed, 106 insertions(+)

Comments

Rafael J. Wysocki Feb. 19, 2019, 9:59 a.m. UTC | #1

On Sunday, February 17, 2019 4:54:13 AM CET Xiongfeng Wang wrote:
> 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.
> 
> Changlog:
> 
> v2 -> v3:
> 	Recontruct 'cppc_get_desired_perf'.
> 	Rename 'cppc_workaround_info' to 'cppc_workaround_oem_info'
> 	Drop 'get_rate' member from struct cppc_workaround_oem_info
> 	Change 'cppc_wa_get_rate' pointer to a flag to indicate whether
> 	we need to aplly the workaround.
> 	Move the new functions to the beginning of cppc-cpufreq.c
> 
> 
> 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       | 39 +++++++++++++++++++++++++
>  drivers/cpufreq/cppc_cpufreq.c | 66 ++++++++++++++++++++++++++++++++++++++++++
>  include/acpi/cppc_acpi.h       |  1 +
>  3 files changed, 106 insertions(+)
> 
> 

Both patches applied, thanks!