linux-kernel - Re: [PATCH v2] cpufreq: qcom: Read voltage LUT and populate OPP

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Date:   Wed, 9 Jan 2019 14:24:00 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Taniya Das <tdas@...eaurora.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        devicetree@...r.kernel.org, robh@...nel.org,
        skannan@...eaurora.org, linux-arm-msm@...r.kernel.org,
        amit.kucheria@...aro.org, Matthias Kaehlcke <mka@...omium.org>,
        evgreen@...gle.com
Subject: Re: [PATCH v2] cpufreq: qcom: Read voltage LUT and populate OPP

On 09-01-19, 13:37, Taniya Das wrote:
> @@ -98,6 +107,8 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,

You are only using this "dev" parameter for dev_dbg(), instead of that
pass cpu_dev pointer.

>  			table[i].frequency = CPUFREQ_ENTRY_INVALID;
>  		} else {
>  			table[i].frequency = freq;
> +			dev_pm_opp_add(get_cpu_device(policy->cpu),
> +					freq * 1000, volt);
>  			dev_dbg(dev, "index=%d freq=%d, core_count %d\n", i,
>  				freq, core_count);
>  		}
> @@ -116,6 +127,8 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
>  			if (prev_cc != max_cores) {
>  				prev->frequency = prev_freq;
>  				prev->flags = CPUFREQ_BOOST_FREQ;
> +				dev_pm_opp_add(get_cpu_device(policy->cpu),
> +						prev_freq * 1000, volt);
>  			}
> 
>  			break;
> @@ -127,6 +140,7 @@ static int qcom_cpufreq_hw_read_lut(struct device *dev,
> 
>  	table[i].frequency = CPUFREQ_TABLE_END;
>  	policy->freq_table = table;
> +	dev_pm_opp_set_sharing_cpus(get_cpu_device(policy->cpu), policy->cpus);

and then all the above sites can be simplified a bit.

>  	return 0;
>  }
> @@ -159,10 +173,18 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>  	struct device *dev = &global_pdev->dev;
>  	struct of_phandle_args args;
>  	struct device_node *cpu_np;
> +	struct device *cpu_dev;
>  	struct resource *res;
>  	void __iomem *base;
>  	int ret, index;
> 
> +	cpu_dev = get_cpu_device(policy->cpu);
> +	if (!cpu_dev) {
> +		pr_err("%s: failed to get cpu%d device\n", __func__,
> +		       policy->cpu);
> +		return -ENODEV;
> +	}
> +
>  	cpu_np = of_cpu_device_node_get(policy->cpu);
>  	if (!cpu_np)
>  		return -EINVAL;
> @@ -205,6 +227,12 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
>  		goto error;
>  	}
> 
> +	ret = dev_pm_opp_get_opp_count(cpu_dev);
> +	if (ret <= 0) {
> +		dev_err(cpu_dev, "OPP table is not ready\n");

Rather say "Failed to add OPPs\n".

> +		goto error;
> +	}
> +
>  	policy->fast_switch_possible = true;
> 
>  	return 0;
> @@ -217,6 +245,7 @@ static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
>  {
>  	void __iomem *base = policy->driver_data - REG_PERF_STATE;
> 
> +	dev_pm_opp_remove_all_dynamic(&global_pdev->dev);

This is platform device's device structure, while you added the OPPs
using cpu_dev. You sure this will work ?

>  	kfree(policy->freq_table);
>  	devm_iounmap(&global_pdev->dev, base);
> 
> --
> Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member
> of the Code Aurora Forum, hosted by the  Linux Foundation.

-- 
viresh