linux-kernel - Re: [PATCH 4/4] PM / Domains: Propagate performance state updates

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Date:   Wed, 21 Nov 2018 12:21:18 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     ulf.hansson@...aro.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        niklas.cassel@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] PM / Domains: Propagate performance state updates



On 11/21/2018 12:06 PM, Viresh Kumar wrote:
> On 21-11-18, 11:12, Rajendra Nayak wrote:
>> And the reason for that seems to be that we update the genpd status to GPD_STATE_ACTIVE
>> *after* we try to set the performance state, so we always hit this check which bails out
>> thinking the genpd is not ON.
> 
> Thanks for looking at it. Here is the (untested) fix, please try it
> out.

Thanks, yes, this does seem to work.

> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 84c13695af65..92be4a224b45 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -250,9 +250,6 @@ static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
>          unsigned int mstate;
>          int ret;
>   
> -       if (!genpd_status_on(genpd))
> -               goto out;
> -
>          /* Propagate to masters of genpd */
>          list_for_each_entry(link, &genpd->slave_links, slave_node) {
>                  master = link->master;
> @@ -286,7 +283,6 @@ static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
>          if (ret)
>                  goto err;
>   
> -out:
>          genpd->performance_state = state;
>          return 0;
>   
> @@ -361,6 +357,11 @@ static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
>                  return 0;
>   
>   update_state:
> +       if (!genpd_status_on(genpd)) {
> +               genpd->performance_state = state;
> +               return 0;
> +       }
> +
>          return _genpd_set_performance_state(genpd, state, depth);
>   }
>