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From: Nathan Fontenot <nathan.fontenot@amd.com>
To: Perry Yuan <Perry.Yuan@amd.com>,
	rafael.j.wysocki@intel.com, ray.huang@amd.com,
	viresh.kumar@linaro.org
Cc: Deepak.Sharma@amd.com, Mario.Limonciello@amd.com,
	Alexander.Deucher@amd.com, Jinzhou.Su@amd.com,
	Shimmer.Huang@amd.com, Xiaojian.Du@amd.com, Li.Meng@amd.com,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/7] cpufreq: amd_pstate: add AMD pstate EPP support for shared memory type processor
Date: Thu, 15 Sep 2022 11:24:06 -0500	[thread overview]
Message-ID: <a21bdd7d-3ade-4a54-1a7f-42831ce8e83a@amd.com> (raw)
In-Reply-To: <20220909164534.71864-5-Perry.Yuan@amd.com>

On 9/9/22 11:45, Perry Yuan wrote:
> Add Energy Performance Preference support for AMD SOCs which only
> support the shared memory interface that implemented on Zen2 and Zen3
> processors, because this type CPU has no MSR supported, it will use
> ACPI PCC channel to enable EPP and reset desired perf to be zero.
> 
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
> ---
>  drivers/cpufreq/amd-pstate.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 451295284a26..fff298744a8e 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -133,12 +133,24 @@ static inline int pstate_enable(bool enable)
>  
>  static int cppc_enable(bool enable)
>  {
> +	struct cppc_perf_ctrls perf_ctrls;
>  	int cpu, ret = 0;
>  
>  	for_each_present_cpu(cpu) {
>  		ret = cppc_set_enable(cpu, enable);
>  		if (ret)
>  			return ret;
> +
> +	/* Enable active mode for EPP */
> +	ret = cppc_set_auto_epp(cpu, enable);
> +	if (ret)
> +		return ret;
> +
> +	/* Set zero to desired perf to enable EPP control*/
> +	perf_ctrls.desired_perf = 0;
> +	ret = cppc_set_perf(cpu, &perf_ctrls);
> +	if (ret)
> +		return ret;

Shouldn't this entire block be indented one additional tab over since its
part of the for_each_present_cpu() loop?

-Nathan

>  	}
>  
>  	return ret;

  parent reply	other threads:[~2022-09-15 16:24 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-09 16:45 [PATCH 0/7] Implement AMD Pstate EPP Driver Perry Yuan
2022-09-09 16:45 ` [PATCH 1/7] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-09-09 16:45 ` [PATCH 2/7] cpufreq: amd_pstate: add module parameter to load amd pstate EPP driver Perry Yuan
2022-09-09 18:49   ` Limonciello, Mario
2022-09-13 15:14     ` Yuan, Perry
2022-09-25 16:58     ` Yuan, Perry
2022-09-09 16:45 ` [PATCH 3/7] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-09-09 16:45 ` [PATCH 4/7] cpufreq: amd_pstate: add AMD pstate EPP support for shared memory type processor Perry Yuan
2022-09-09 18:52   ` Limonciello, Mario
2022-09-13 15:20     ` Yuan, Perry
2022-09-25 17:01     ` Yuan, Perry
2022-09-15 16:24   ` Nathan Fontenot [this message]
2022-09-25 12:23     ` Yuan, Perry
2022-09-29 14:08       ` Nathan Fontenot
2022-09-09 16:45 ` [PATCH 5/7] cpufreq: amd_pstate: add AMD Pstate EPP support for the MSR based processors Perry Yuan
2022-09-15 18:58   ` Nathan Fontenot
2022-09-25 17:12     ` Yuan, Perry
2022-09-09 16:45 ` [PATCH 6/7] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-09-09 19:02   ` Limonciello, Mario
2022-09-15 19:03   ` Nathan Fontenot
2022-09-09 16:45 ` [PATCH 7/7] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-09-09 19:00   ` Limonciello, Mario

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