linux-kernel - Re: [PATCH] intel-pstate: Use #defines instead of hard-coded values.

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Message-ID: <5149DF9D.20605@intel.com>
Date:	Wed, 20 Mar 2013 09:11:09 -0700
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	rafael.j.wysocki@...el.com, dirk.j.brandewie@...el.com
Subject: Re: [PATCH] intel-pstate: Use #defines instead of hard-coded values.

On 03/20/2013 07:21 AM, Konrad Rzeszutek Wilk wrote:
> They are defined in coreboot (MSR_PLATFORM) and the other
> one is already defined in msr-index.h.
>
> Lets use those.
>
> CC: rafael.j.wysocki@...el.com
> CC: dirk.j.brandewie@...el.com
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Acked-by: Dirk Brandewie <dirk.j.brandewie@...el.com>

> ---
>   arch/x86/include/uapi/asm/msr-index.h | 1 +
>   drivers/cpufreq/intel_pstate.c        | 6 +++---
>   2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
> index 892ce40..7a060f4 100644
> --- a/arch/x86/include/uapi/asm/msr-index.h
> +++ b/arch/x86/include/uapi/asm/msr-index.h
> @@ -44,6 +44,7 @@
>   #define SNB_C1_AUTO_UNDEMOTE		(1UL << 27)
>   #define SNB_C3_AUTO_UNDEMOTE		(1UL << 28)
>
> +#define MSR_PLATFORM_INFO		0x000000ce
>   #define MSR_MTRRcap			0x000000fe
>   #define MSR_IA32_BBL_CR_CTL		0x00000119
>   #define MSR_IA32_BBL_CR_CTL3		0x0000011e
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index f6dd1e7..dadc27d 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -358,14 +358,14 @@ static void intel_pstate_sysfs_expose_params(void)
>   static int intel_pstate_min_pstate(void)
>   {
>   	u64 value;
> -	rdmsrl(0xCE, value);
> +	rdmsrl(MSR_PLATFORM_INFO, value);
>   	return (value >> 40) & 0xFF;
>   }
>
>   static int intel_pstate_max_pstate(void)
>   {
>   	u64 value;
> -	rdmsrl(0xCE, value);
> +	rdmsrl(MSR_PLATFORM_INFO, value);
>   	return (value >> 8) & 0xFF;
>   }
>
> @@ -373,7 +373,7 @@ static int intel_pstate_turbo_pstate(void)
>   {
>   	u64 value;
>   	int nont, ret;
> -	rdmsrl(0x1AD, value);
> +	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
>   	nont = intel_pstate_max_pstate();
>   	ret = ((value) & 255);
>   	if (ret <= nont)
>

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