linux-kernel - Re: [PATCH] OPP: Fix _set_required

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Date: Wed, 27 Dec 2023 12:41:27 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: vireshk@...nel.org, nm@...com, sboyd@...nel.org, ulf.hansson@...aro.org,
 stephan.gerhold@...nkonzept.com, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] OPP: Fix _set_required_opps when opp is NULL

On 26/12/2023 05:59, Viresh Kumar wrote:
> On 23-12-23, 02:34, Bryan O'Donoghue wrote:
>> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
>> index c022d548067d7..182e07ab6baf3 100644
>> --- a/drivers/opp/core.c
>> +++ b/drivers/opp/core.c
>> @@ -1083,7 +1083,11 @@ static int _set_required_opps(struct device *dev, struct opp_table *opp_table,
>>   
>>   	while (index != target) {
>>   		if (devs[index]) {
>> -			ret = dev_pm_opp_set_opp(devs[index], opp->required_opps[index]);
>> +			if (opp)
>> +				ret = dev_pm_opp_set_opp(devs[index], opp->required_opps[index]);
>> +			else
>> +				ret = dev_pm_domain_set_performance_state(devs[index], 0);
>> +
>>   			if (ret)
>>   				return ret;
>>   		}
> 
> Sorry about that, my mistake. Can you test below instead please ?
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index c022d548067d..c4d695e0e5fd 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -1061,6 +1061,7 @@ static int _set_required_opps(struct device *dev, struct opp_table *opp_table,
>                                struct dev_pm_opp *opp, bool up)
>   {
>          struct device **devs = opp_table->required_devs;
> +       struct dev_pm_opp *required_opp;
>          int index, target, delta, ret;
> 
>          if (!devs)
> @@ -1083,7 +1084,9 @@ static int _set_required_opps(struct device *dev, struct opp_table *opp_table,
> 
>          while (index != target) {
>                  if (devs[index]) {
> -                       ret = dev_pm_opp_set_opp(devs[index], opp->required_opps[index]);
> +                       required_opp = opp ? opp->required_opps[index] : NULL;
> +
> +                       ret = dev_pm_opp_set_opp(devs[index], required_opp);
>                          if (ret)
>                                  return ret;
>                  }
> 

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>