linux-kernel - Re: [PATCH v4 4/4] opp: Make _set_opp

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Date:   Fri, 22 Jan 2021 17:43:25 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.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>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 4/4] opp: Make _set_opp_custom() work without
 regulators

21.01.2021 01:26, Dmitry Osipenko пишет:
> Check whether OPP table has regulators in _set_opp_custom() and set up
> dev_pm_set_opp_data accordingly. Now _set_opp_custom() works properly,
> i.e. it doesn't crash if OPP table doesn't have assigned regulators.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/opp/core.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 08d205a55c07..c38ac1cf62ac 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -829,23 +829,31 @@ static int _set_opp_custom(const struct opp_table *opp_table,
>  			   struct dev_pm_opp_supply *new_supply)
>  {
>  	struct dev_pm_set_opp_data *data;
> -	int size;
> +	int size, regulator_count;
> +
> +	if (opp_table->sod_supplies)
> +		regulator_count = opp_table->regulator_count;
> +	else
> +		regulator_count = 0;
>  
>  	data = opp_table->set_opp_data;
>  	data->regulators = opp_table->regulators;
> -	data->regulator_count = opp_table->regulator_count;
> +	data->regulator_count = regulator_count;
>  	data->clk = opp_table->clk;
>  	data->dev = dev;
>  
>  	data->old_opp.rate = old_freq;
> -	size = sizeof(*old_supply) * opp_table->regulator_count;
> -	if (!old_supply)
> -		memset(data->old_opp.supplies, 0, size);
> -	else
> -		memcpy(data->old_opp.supplies, old_supply, size);
> -
>  	data->new_opp.rate = freq;
> -	memcpy(data->new_opp.supplies, new_supply, size);
> +
> +	if (regulator_count) {
> +		size = sizeof(*old_supply) * opp_table->regulator_count;
> +		if (!old_supply)
> +			memset(data->old_opp.supplies, 0, size);
> +		else
> +			memcpy(data->old_opp.supplies, old_supply, size);
> +
> +		memcpy(data->new_opp.supplies, new_supply, size);
> +	}
>  
>  	return opp_table->set_opp(data);
>  }
> 

Looks good, thank you!