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SubjectRe: [PATCH RFC 6/9] OPP: Add and export helper to update voltage
On 28-03-19, 20:58, Sibi Sankar wrote:
> Add and export 'dev_pm_opp_update_voltage' to find and update voltage
> of an opp for a given frequency. This will be useful to update the opps
> with voltages read back from firmware.
>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
> drivers/opp/core.c | 62 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/pm_opp.h | 10 +++++++
> 2 files changed, 72 insertions(+)
>
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index addaf7aae9ae..c066cd120a33 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -2090,6 +2090,68 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq)
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
>
> +static int _opp_update_voltage(struct device *dev, unsigned long freq,
> + unsigned long u_volt)
> +{
> + struct opp_table *opp_table;
> + struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
> + int r = 0;

s/r/ret/

> +
> + /* Find the opp_table */
> + opp_table = _find_opp_table(dev);
> + if (IS_ERR(opp_table)) {
> + r = PTR_ERR(opp_table);
> + dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);

Why dev_warn instead of dev_err which is normally used in this file ? And you
weren't searching for OPP but opp_table. Put out the correct error message
please.

> + return r;
> + }
> +
> + mutex_lock(&opp_table->lock);
> +
> + /* Do we have the frequency? */
> + list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
> + if (tmp_opp->rate == freq) {
> + opp = tmp_opp;
> + break;
> + }
> + }
> +
> + if (IS_ERR(opp)) {
> + r = PTR_ERR(opp);
> + goto unlock;
> + }
> +
> + /* update only if the opp is disabled */
> + if (opp->available)
> + goto unlock;
> +

What about reusing dev_pm_opp_find_freq_exact() instead of the above code in
this routine ?

> + opp->supplies[0].u_volt = u_volt;
> +
> +unlock:
> + mutex_unlock(&opp_table->lock);
> + dev_pm_opp_put_opp_table(opp_table);
> + return r;
> +}
> +
> +/**
> + * dev_pm_opp_update_voltage() - find and update voltage of an opp
> + * for a given frequency
> + * @dev: device for which we do this operation
> + * @freq: OPP frequency to update voltage
> + * @u_volt: voltage requested for this opp
> + *
> + * This is useful only for devices with single power supply.
> + *
> + * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
> + * copy operation, returns 0 if no modification was done OR modification was
> + * successful.
> + */
> +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
> + unsigned long u_volt)
> +{
> + return _opp_update_voltage(dev, freq, u_volt);

Remove the unnecessary wrapper and open code this routine here. While at it, you
should updated min/max/target and not just target voltage.

> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_update_voltage);
> +
> /**
> * dev_pm_opp_register_notifier() - Register OPP notifier for the device
> * @dev: Device for which notifier needs to be registered
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index d7cb0e65c4f0..58490f6839ce 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -130,6 +130,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
>
> int dev_pm_opp_disable(struct device *dev, unsigned long freq);
>
> +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
> + unsigned long u_volt);
> +
> int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
> int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
>
> @@ -265,6 +268,13 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
> return 0;
> }
>
> +static inline int dev_pm_opp_update_voltage(struct device *dev,
> + unsigned long freq,
> + unsigned long u_volt)
> +{
> + return 0;
> +}
> +
> static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
> {
> return -ENOTSUPP;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

--
viresh

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