linux-kernel - Re: [PATCH] platform/x86: intel_turbo_max_3: Remove restriction for HWP platforms

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Message-ID: <CAHp75VdUnw0NjcNDKzFp-hZWho4A8RV=9Xthz-foZ6wTaT+Ftg@mail.gmail.com>
Date:   Wed, 14 Feb 2018 21:29:08 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arjan@...ux.intel.com
Subject: Re: [PATCH] platform/x86: intel_turbo_max_3: Remove restriction for
 HWP platforms

On Mon, Feb 12, 2018 at 9:50 PM, Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
> On systems supporting HWP (Hardware P-States) mode, we expected to
> enumerate core priority via ACPI-CPPC tables. Unfortunately deployment of
> TURBO 3.0 didn't use this method to show core priority. So users are not
> able to utilize this feature in HWP mode.
>
> So remove the loading restriction of this driver for HWP enabled systems.
> Even if there are some systems, which are providing the core priority via
> ACPI CPPC, this shouldn't cause any conflict as the source of priority
> definition is same.
>

Pushed to my review and testing queue, thanks!

P.S. Should it go to stable?

> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Reported-and-tested-and-reviewed-by: Arjan van de Ven <arjan@...ux.intel.com>
> ---
>  drivers/platform/x86/intel_turbo_max_3.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_turbo_max_3.c b/drivers/platform/x86/intel_turbo_max_3.c
> index d4ea01805879..a6d5aa0c3c47 100644
> --- a/drivers/platform/x86/intel_turbo_max_3.c
> +++ b/drivers/platform/x86/intel_turbo_max_3.c
> @@ -138,9 +138,6 @@ static int __init itmt_legacy_init(void)
>         if (!id)
>                 return -ENODEV;
>
> -       if (boot_cpu_has(X86_FEATURE_HWP))
> -               return -ENODEV;
> -
>         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
>                                 "platform/x86/turbo_max_3:online",
>                                 itmt_legacy_cpu_online, NULL);
> --
> 2.13.6
>



-- 
With Best Regards,
Andy Shevchenko