linux-kernel - Re: [PATCH v4 1/3] PM: domains: Make set_performance

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Message-ID: <20210120043933.6ilryvgkhvnsrei7@vireshk-i7>
Date:   Wed, 20 Jan 2021 10:09:33 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 1/3] PM: domains: Make set_performance_state()
 callback optional

On 20-01-21, 04:50, Dmitry Osipenko 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.
> 
> Tested-by: Peter Geis <pgwipeout@...il.com>
> Tested-by: Nicolas Chauvet <kwizart@...il.com>
> Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
> [tested on NVIDIA Tegra20/30/124 SoCs]
> Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/base/power/domain.c | 33 ++++++++++++++++++---------------
>  1 file changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 9a14eedacb92..0bd0cdc30393 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -297,6 +297,18 @@ static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
>  	return state;
>  }
>  
> +static int _genpd_xlate_performance_state(struct generic_pm_domain *src_genpd,
> +					  struct generic_pm_domain *dst_genpd,
> +					  unsigned int pstate)

I would name them as genpd and parent, that makes it more readable for it.

-- 
viresh