linux-kernel - Re: [PATCH v2] cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode

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Message-ID: <CAAYoRsUcyFsFWDE=r+aMgDBa6hcgXgtE2jJ_NHas5e4TdgiBTg@mail.gmail.com>
Date:   Fri, 14 May 2021 08:31:25 -0700
From:   Doug Smythies <dsmythies@...us.net>
To:     Giovanni Gherdovich <ggherdovich@...e.cz>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dsmythies <dsmythies@...us.net>
Subject: Re: [PATCH v2] cpufreq: intel_pstate: Add Icelake servers support in
 no-HWP mode

Hi All,

Can I on-board to this patch or do you want me to submit another?
I want to add COMETLAKE (tested), as below:

... Doug

On Thu, May 13, 2021 at 6:21 AM Giovanni Gherdovich <ggherdovich@...e.cz> wrote:
>
> Users may disable HWP in firmware, in which case intel_pstate wouldn't load
> unless the CPU model is explicitly supported.
>
> Add ICELAKE_X to the list of CPUs that can register intel_pstate while not
> advertising the HWP capability. Without this change, an ICELAKE_X in no-HWP
> mode could only use the acpi_cpufreq frequency scaling driver.
>
> See also commit d8de7a44e11f ("cpufreq: intel_pstate: Add Skylake servers
> support").
>
> Signed-off-by: Giovanni Gherdovich <ggherdovich@...e.cz>
> ---
> This replaces https://lore.kernel.org/lkml/20210513075930.22657-1-ggherdovich@suse.cz
>
>  drivers/cpufreq/intel_pstate.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index f0401064d7aa..28c9733e0dce 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -2087,6 +2087,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
>         X86_MATCH(ATOM_GOLDMONT,        core_funcs),
>         X86_MATCH(ATOM_GOLDMONT_PLUS,   core_funcs),
>         X86_MATCH(SKYLAKE_X,            core_funcs),
> +       X86_MATCH(ICELAKE_X,            core_funcs),
   +       X86_MATCH(COMETLAKE,          core_funcs),
>         {}
>  };
>  MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
> --
> 2.26.2
>