Re: [PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

[Tony W Wang-oc]

On 22/6/2022 21:39, Rafael J. Wysocki wrote:
> On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx> wrote:
> > Recent Zhaoxin CPUs support X86_FEATURE_IDA and the turbo boost can
> > be dynamically enabled or disabled through MSR 0x1a0[38] in the same
> > way as Intel. So add turbo boost control support for Zhaoxin too.
>
> And for Centaur too according to the code changes below.

Ok, thanks a lot.

> > Signed-off-by: Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx>
> > ---
> >    drivers/cpufreq/acpi-cpufreq.c | 4 ++++
> >    1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> > index 3d514b8..1bb2b90 100644
> > --- a/drivers/cpufreq/acpi-cpufreq.c
> > +++ b/drivers/cpufreq/acpi-cpufreq.c
> > @@ -78,6 +78,8 @@ static bool boost_state(unsigned int cpu)
> >
> >          switch (boot_cpu_data.x86_vendor) {
> >          case X86_VENDOR_INTEL:
> > +       case X86_VENDOR_CENTAUR:
> > +       case X86_VENDOR_ZHAOXIN:
> >                  rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
> >                  msr = lo | ((u64)hi << 32);
> >                  return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
> > @@ -97,6 +99,8 @@ static int boost_set_msr(bool enable)
> >
> >          switch (boot_cpu_data.x86_vendor) {
> >          case X86_VENDOR_INTEL:
> > +       case X86_VENDOR_CENTAUR:
> > +       case X86_VENDOR_ZHAOXIN:
> >                  msr_addr = MSR_IA32_MISC_ENABLE;
> >                  msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
> >                  break;
> > --
> > 2.7.4
> .

--
Sincerely
TonyWWang-oc