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

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Message-ID: <16a86c26-8930-c7bd-3afd-d92f56fe005f@linaro.org>
Date:   Tue, 27 Jul 2021 23:12:57 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Ulf Hansson <ulf.hansson@...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 22/07/2021 13:26, Ulf Hansson wrote:
> 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.

Ack

> 
> 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
>>


-- 
With best wishes
Dmitry