linux-kernel - Re: [PATCH v2 20/48] PM: domains: Make set_performance

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Date:   Mon, 11 Jan 2021 10:10:36 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 20/48] PM: domains: Make set_performance_state()
 callback optional

On Thu, 17 Dec 2020 at 19:07, Dmitry Osipenko <digetx@...il.com> wrote:
>
> Make set_performance_state() callback optional in order to remove the
> need from power domain drivers to implement a dummy callback. If callback
> isn't implemented by a GENPD driver, then the performance state is passed
> to the parent domain.
>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

This should be ready to be picked up, but maybe it's easier if you
could send this to the linux-pm mailing list separately. Then Rafael
can pick it up.

Kind regards
Uffe

> ---
>  drivers/base/power/domain.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 9a14eedacb92..a3e1bfc233d4 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -339,9 +339,11 @@ static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
>                         goto err;
>         }
>
> -       ret = genpd->set_performance_state(genpd, state);
> -       if (ret)
> -               goto err;
> +       if (genpd->set_performance_state) {
> +               ret = genpd->set_performance_state(genpd, state);
> +               if (ret)
> +                       goto err;
> +       }
>
>         genpd->performance_state = state;
>         return 0;
> @@ -399,9 +401,6 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
>         if (!genpd)
>                 return -ENODEV;
>
> -       if (unlikely(!genpd->set_performance_state))
> -               return -EINVAL;
> -
>         if (WARN_ON(!dev->power.subsys_data ||
>                      !dev->power.subsys_data->domain_data))
>                 return -EINVAL;
> --
> 2.29.2
>