linux-kernel - Re: [PATCH v6 1/2] PM / Domains: Add support for 'required-opps' to set default perf state

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Message-ID: <f58e631d-67a7-4981-ce59-6a4772b44564@gmail.com>
Date:   Tue, 10 Aug 2021 01:26:47 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rajendra Nayak <rnayak@...eaurora.org>, ulf.hansson@...aro.org,
        bjorn.andersson@...aro.org, viresh.kumar@...aro.org
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        swboyd@...omium.org, rojay@...eaurora.org, stephan@...hold.net
Subject: Re: [PATCH v6 1/2] PM / Domains: Add support for 'required-opps' to
 set default perf state

04.08.2021 13:58, Rajendra Nayak пишет:
> @@ -2637,6 +2643,8 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
>  {
>  	struct of_phandle_args pd_args;
>  	struct generic_pm_domain *pd;
> +	struct device_node *np;
> +	int pstate;
>  	int ret;
>  
>  	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
> @@ -2675,10 +2683,26 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
>  		genpd_unlock(pd);
>  	}
>  
> -	if (ret)
> +	if (ret) {
>  		genpd_remove_device(pd, dev);
> +		return -EPROBE_DEFER;
> +	}
> +
> +	/* Set the default performance state */
> +	np = dev->of_node;
> +	if (of_parse_phandle(np, "required-opps", index)) {
> +		pstate = of_get_required_opp_performance_state(np, index);
> +		if (pstate < 0) {
> +			ret = pstate;
> +			dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
> +				pd->name, ret);
> +		} else {
> +			dev_pm_genpd_set_performance_state(dev, pstate);
> +			dev_gpd_data(dev)->default_pstate = pstate;
> +		}
> +	}

Why performance state is set after genpd_power_on()?