linux-kernel - Re: [PATCH 6/7] cpufreq: make cpufreq_generic_init transition_latency default to CPUFREQ

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Message-ID: <20170920070450.GB32187@b29396-OptiPlex-7040>
Date:   Wed, 20 Sep 2017 15:04:50 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Dong Aisheng <aisheng.dong@....com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sboyd@...eaurora.org, vireshk@...nel.org, nm@...com,
        rjw@...ysocki.net, shawnguo@...nel.org, Anson.Huang@....com,
        ping.bai@....com
Subject: Re: [PATCH 6/7] cpufreq: make cpufreq_generic_init
 transition_latency default to CPUFREQ_ETERNAL

On Tue, Sep 19, 2017 at 04:10:07PM -0700, Viresh Kumar wrote:
> On 24-08-17, 00:10, Dong Aisheng wrote:
> > If no valid transition_latency specified, let's make it default to
> > CPUFREQ_ETERNAL which is consistent with its definition.
> > 
> > This can save some of the same checkings like this:
> >         transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
> > -       if (!transition_latency)
> > -               transition_latency = CPUFREQ_ETERNAL;
> >         ret = cpufreq_generic_init(policy, freq_table, transition_latency);
> > 
> > Cc: Viresh Kumar <vireshk@...nel.org>
> > Cc: Nishanth Menon <nm@...com>
> > Cc: Stephen Boyd <sboyd@...eaurora.org>
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> > ---
> >  drivers/cpufreq/cpufreq.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> > index 9bf97a3..da07de6 100644
> > --- a/drivers/cpufreq/cpufreq.c
> > +++ b/drivers/cpufreq/cpufreq.c
> > @@ -180,6 +180,8 @@ int cpufreq_generic_init(struct cpufreq_policy *policy,
> >  		return ret;
> >  	}
> >  
> > +	if (!transition_latency)
> > +		transition_latency = CPUFREQ_ETERNAL;
> >  	policy->cpuinfo.transition_latency = transition_latency;
> >  
> >  	/*
> 
> Can you update all the existing drivers as well (in the same patch)
> who can benefit from it?

Yes, of course.
Will do it in the updated version later.

Thanks

Regards
Dong Aisheng

> 
> -- 
> viresh