linux-kernel - Re: [PATCH 1/3] opp: core: add regulators enable and disable

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Date:   Thu, 11 Jul 2019 11:52:26 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     k.konieczny@...tner.samsung.com
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 1/3] opp: core: add regulators enable and disable

On 08-07-19, 16:11, k.konieczny@...tner.samsung.com wrote:
> From: Kamil Konieczny <k.konieczny@...tner.samsung.com>
> 
> Add enable regulators to dev_pm_opp_set_regulators() and disable
> regulators to dev_pm_opp_put_regulators(). This prepares for
> converting exynos-bus devfreq driver to use dev_pm_opp_set_rate().
> 
> Signed-off-by: Kamil Konieczny <k.konieczny@...tner.samsung.com>
> ---
>  drivers/opp/core.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 0e7703fe733f..947cac452854 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -1580,8 +1580,19 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
>  	if (ret)
>  		goto free_regulators;
>  
> +	for (i = 0; i < opp_table->regulator_count; i++) {
> +		ret = regulator_enable(opp_table->regulators[i]);
> +		if (ret < 0)
> +			goto disable;
> +	}

What about doing this in the same loop of regulator_get_optional() ?

> +
>  	return opp_table;
>  
> +disable:
> +	while (i != 0)
> +		regulator_disable(opp_table->regulators[--i]);
> +
> +	i = opp_table->regulator_count;

You also need to call _free_set_opp_data() here.

>  free_regulators:
>  	while (i != 0)
>  		regulator_put(opp_table->regulators[--i]);
> @@ -1609,6 +1620,8 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
>  
>  	/* Make sure there are no concurrent readers while updating opp_table */
>  	WARN_ON(!list_empty(&opp_table->opp_list));

Preserve the blank line here.

> +	for (i = opp_table->regulator_count - 1; i >= 0; i--)
> +		regulator_disable(opp_table->regulators[i]);
>  
>  	for (i = opp_table->regulator_count - 1; i >= 0; i--)
>  		regulator_put(opp_table->regulators[i]);

Only single loop should be sufficient for this.

> -- 
> 2.22.0

-- 
viresh