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

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Date:   Wed, 22 Jun 2022 15:39:49 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Tony W Wang-oc <TonyWWang-oc@...oxin.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        CobeChen@...oxin.com, TimGuo@...oxin.com, LindaChai@...oxin.com,
        LeoLiu@...oxin.com
Subject: Re: [PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <TonyWWang-oc@...oxin.com> 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.

>
> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
> ---
>   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