linux-kernel - Re: [PATCH v4 6/7] cpufreq: qcom-hw: Allow getting the maximum transition latency for OPPs

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Date:   Mon, 19 Apr 2021 14:19:52 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Cc:     viresh.kumar@...aro.org, agross@...nel.org, rjw@...ysocki.net,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        amit.kucheria@...aro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, jeffrey.l.hugo@...il.com
Subject: Re: [PATCH v4 6/7] cpufreq: qcom-hw: Allow getting the maximum
 transition latency for OPPs

On Tue 19 Jan 11:45 CST 2021, AngeloGioacchino Del Regno wrote:

> In order to fine-tune the frequency scaling from various governors,
> allow to set a maximum transition latency from OPPs, which may be
> different depending on the SoC.
> 

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> ---
>  drivers/cpufreq/qcom-cpufreq-hw.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
> index a92959bb7b50..5f67da796f6c 100644
> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> @@ -1401,6 +1401,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>  	void __iomem *base;
>  	struct qcom_cpufreq_data *data;
>  	const char *fdom_resname;
> +	unsigned int transition_latency;
>  	int cpu_count, index, ret;
>  
>  	cpu_dev = get_cpu_device(policy->cpu);
> @@ -1478,6 +1479,12 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>  		goto error;
>  	}
>  
> +	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
> +	if (!transition_latency)
> +		transition_latency = CPUFREQ_ETERNAL;
> +
> +	policy->cpuinfo.transition_latency = transition_latency;
> +
>  	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
>  
>  	if (policy_has_boost_freq(policy)) {
> -- 
> 2.30.0
>