linux-kernel - Re: [PATCH v5 3/9] PM: runtime: add devm_pm_runtime

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Message-ID: <CAPDyKFqws1iC+PtQ3iRzzFF1NQZ=huRbA3wNBbS2gmyVqgmhxQ@mail.gmail.com>
Date:   Thu, 22 Jul 2021 12:26:59 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/9] PM: runtime: add devm_pm_runtime_enable helper

On Sun, 18 Jul 2021 at 12:49, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> Add helper function handling typical driver action: call
> pm_runtime_enable at the probe() time and disable it during remove().
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/base/power/runtime.c | 17 +++++++++++++++++
>  include/linux/pm_runtime.h   |  4 ++++
>  2 files changed, 21 insertions(+)

First, this needs to be sent to the correct maintainers (Rafael) and
also the mailing list (linux-pm).

Second, to not stall the series by $subject patch as it will likely
need to be funneled through Rafael's tree, perhaps it's just better to
do the "open coding" in the qcom drivers for now.

Kind regards
Uffe

>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 8a66eaf731e4..ec94049442b9 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -1447,6 +1447,23 @@ void pm_runtime_enable(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(pm_runtime_enable);
>
> +static void pm_runtime_disable_action(void *data)
> +{
> +       pm_runtime_disable(data);
> +}
> +
> +/**
> + * devm_pm_runtime_enable - devres-enabled version of pm_runtime_enable.
> + * @dev: Device to handle.
> + */
> +int devm_pm_runtime_enable(struct device *dev)
> +{
> +       pm_runtime_enable(dev);
> +
> +       return devm_add_action_or_reset(dev, pm_runtime_disable_action, dev);
> +}
> +EXPORT_SYMBOL_GPL(devm_pm_runtime_enable);
> +
>  /**
>   * pm_runtime_forbid - Block runtime PM of a device.
>   * @dev: Device to handle.
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index aab8b35e9f8a..222da43b7096 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -59,6 +59,8 @@ extern void pm_runtime_put_suppliers(struct device *dev);
>  extern void pm_runtime_new_link(struct device *dev);
>  extern void pm_runtime_drop_link(struct device_link *link);
>
> +extern int devm_pm_runtime_enable(struct device *dev);
> +
>  /**
>   * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
>   * @dev: Target device.
> @@ -253,6 +255,8 @@ static inline void __pm_runtime_disable(struct device *dev, bool c) {}
>  static inline void pm_runtime_allow(struct device *dev) {}
>  static inline void pm_runtime_forbid(struct device *dev) {}
>
> +static inline int devm_pm_runtime_enable(struct device *dev) { return 0; }
> +
>  static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
>  static inline void pm_runtime_get_noresume(struct device *dev) {}
>  static inline void pm_runtime_put_noidle(struct device *dev) {}
> --
> 2.30.2
>