linux-kernel - Re: [PATCH v5 3/3] OPP: Add helper function for bandwidth OPP tables

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Message-Id: <20190816182259.538532077C@mail.kernel.org>
Date:   Fri, 16 Aug 2019 11:22:58 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Mark Rutland <mark.rutland@....com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Viresh Kumar <vireshk@...nel.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        vincent.guittot@...aro.org, seansw@....qualcomm.com,
        daidavid1@...eaurora.org, adharmap@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>, sibis@...eaurora.org,
        bjorn.andersson@...aro.org, evgreen@...omium.org,
        kernel-team@...roid.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] OPP: Add helper function for bandwidth OPP tables

Quoting Saravana Kannan (2019-08-07 15:31:11)
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 3b7ffd0234e9..22dcf22f908f 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -127,6 +127,29 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
>  
> +/**
> + * dev_pm_opp_get_bw() - Gets the bandwidth corresponding to an available opp
> + * @opp:       opp for which frequency has to be returned for

s/frequency/bandwidth/ ?

> + * @avg_bw:    Pointer where the corresponding average bandwidth is stored.
> + *             Can be NULL.
> + *
> + * Return: Peak bandwidth in kBps corresponding to the opp, else
> + * return 0
> + */
> +unsigned long dev_pm_opp_get_bw(struct dev_pm_opp *opp, unsigned long *avg_bw)
> +{
> +       if (IS_ERR_OR_NULL(opp) || !opp->available) {
> +               pr_err("%s: Invalid parameters\n", __func__);
> +               return 0;
> +       }
> +
> +       if (avg_bw)
> +               *avg_bw = opp->avg_bw;
> +
> +       return opp->rate;

It deserves a comment if it stays named 'rate'. At a glance it looks
like a bug.

> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_get_bw);
> +
>  /**
>   * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
>   * @opp:       opp for which level value has to be returned for
> @@ -299,6 +322,34 @@ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
>  
> +/**
> + * dev_pm_opp_get_suspend_opp_bw() - Get peak bandwidth of suspend opp in kBps
> + * @dev:       device for which we do this operation
> + * @avg_bw:    Pointer where the corresponding average bandwidth is stored.
> + *             Can be NULL.
> + *
> + * Return: This function returns the peak bandwidth of the OPP marked as
> + * suspend_opp if one is available, else returns 0;

Why a semicolon instead a full stop?