Re: [PATCH v3 1/9] opp: add new helper API dev_pm_opp_set_level()

Trilok Soni
2025-05-02T03:49:35Z

On 5/1/2025 8:10 PM, Praveen Talari wrote:
> To configure a device to a specific performance level, consumer drivers
> currently need to determine the OPP based on the exact level and then
> set it, resulting in code duplication across drivers.
>
> The new helper API, dev_pm_opp_set_level(), addresses this issue by
> providing a streamlined method for consumer drivers to find and set the
> OPP based on the desired performance level, thereby eliminating
> redundancy.
>
> Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
>
> v2 -> v3
> - moved function defination to pm_opp.h from core.c with inline
> - updated return value with IS_ERR(opp)
>
> v1 -> v2
> - reorder sequence of tags in commit text

The version log above will go into the commit text. Please keep it after
---.

> ---
> include/linux/pm_opp.h | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index e7b5c602c92f..31ed8a7b554e 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -197,6 +197,28 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
> void dev_pm_opp_remove_table(struct device *dev);
> void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
> int dev_pm_opp_sync_regulators(struct device *dev);
> +
> +/*
> + * dev_pm_opp_set_level() - Configure device for a level
> + * @dev: device for which we do this operation
> + * @level: level to set to
> + *
> + * Return: 0 on success, a non-zero value if there is an error otherwise.
> + */
> +static inline int dev_pm_opp_set_level(struct device *dev, unsigned int level)
> +{
> + struct dev_pm_opp *opp = dev_pm_opp_find_level_exact(dev, level);
> + int ret;
> +
> + if (IS_ERR(opp))
> + return IS_ERR(opp);
> +
> + ret = dev_pm_opp_set_opp(dev, opp);
> + dev_pm_opp_put(opp);
> +
> + return ret;
> +}
> +
> #else
> static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
> {
> @@ -461,6 +483,11 @@ static inline int dev_pm_opp_sync_regulators(struct device *dev)
> return -EOPNOTSUPP;
> }
>
> +static inline int dev_pm_opp_set_level(struct device *dev, unsigned int level)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> #endif /* CONFIG_PM_OPP */
>
> #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)

--
---Trilok Soni