linux-kernel - Re: [PATCH v5 3/5] opp: Add dev_pm_opp_find_level

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Message-ID: <8ec79ad9-bbd5-eac7-3128-0487e0459b61@quicinc.com>
Date:   Thu, 28 Sep 2023 08:54:29 +0530
From:   Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <vireshk@...nel.org>, <nm@...com>,
        <sboyd@...nel.org>, <mani@...nel.org>, <lpieralisi@...nel.org>,
        <kw@...ux.com>, <robh@...nel.org>, <bhelgaas@...gle.com>,
        <rafael@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <quic_vbadigan@...cinc.com>, <quic_nitegupt@...cinc.com>,
        <quic_skananth@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_parass@...cinc.com>
Subject: Re: [PATCH v5 3/5] opp: Add dev_pm_opp_find_level_floor()


On 9/27/2023 12:44 PM, Viresh Kumar wrote:
> On 07-09-23, 11:30, Krishna chaitanya chundru wrote:
>
> $Subject should have OPP instead of opp. Past history of framework can be seen
> for this.

I will change the subject in the next patch series.

- KC

>> During initialization of some drivers, need to vote for max level.
>>
>> Adding dev_pm_opp_find_level_floor() for searching a lesser match or
>> operating on OPP in the order of decreasing level.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>> ---
>>   drivers/opp/core.c     | 25 +++++++++++++++++++++++++
>>   include/linux/pm_opp.h |  9 +++++++++
>>   2 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
>> index 919cc53..6d4d226 100644
>> --- a/drivers/opp/core.c
>> +++ b/drivers/opp/core.c
>> @@ -814,6 +814,31 @@ struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
>>   EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
>>   
>>   /**
>> + * dev_pm_opp_find_level_floor() - Search for a rounded floor freq
> freq ?
>
>> + * @dev:	device for which we do this operation
>> + * @level:	Start level
>> + *
>> + * Search for the matching floor *available* OPP from a starting level
>> + * for a device.
>> + *
>> + * Return: matching *opp and refreshes *level accordingly, else returns
>> + * ERR_PTR in case of error and should be handled using IS_ERR. Error return
>> + * values can be:
>> + * EINVAL:	for bad pointer
>> + * ERANGE:	no match found for search
>> + * ENODEV:	if device not found in list of registered devices
>> + *
>> + * The callers are required to call dev_pm_opp_put() for the returned OPP after
>> + * use.
>> + */
>> +struct dev_pm_opp *dev_pm_opp_find_level_floor(struct device *dev,
>> +					       unsigned long *level)
>> +{
>> +	return _find_key_floor(dev, level, 0, true, _read_level, NULL);
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_floor);
>> +
>> +/**
>>    * dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth
>>    * @dev:	device for which we do this operation
>>    * @bw:	start bandwidth
>> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
>> index 91f87d7..baea92f 100644
>> --- a/include/linux/pm_opp.h
>> +++ b/include/linux/pm_opp.h
>> @@ -144,6 +144,9 @@ struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
>>   struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
>>   					      unsigned int *level);
>>   
>> +struct dev_pm_opp *dev_pm_opp_find_level_floor(struct device *dev,
>> +					       unsigned long *level);
>> +
>>   struct dev_pm_opp *dev_pm_opp_find_bw_ceil(struct device *dev,
>>   					   unsigned int *bw, int index);
>>   
>> @@ -314,6 +317,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_bw_ceil(struct device *dev,
>>   	return ERR_PTR(-EOPNOTSUPP);
>>   }
>>   
>> +static inline struct dev_pm_opp *dev_pm_opp_find_level_floor(struct device *dev,
> Why add between two bw related functions ?
>
>> +							     unsigned long *level)
>> +{
>> +	return ERR_PTR(-EOPNOTSUPP);
>> +}
>> +
>>   static inline struct dev_pm_opp *dev_pm_opp_find_bw_floor(struct device *dev,
>>   					unsigned int *bw, int index)
>>   {
> Fixed all this and applied. Thanks.
>