Re: [v5, PATCH 4/5] cpufreq: mediatek: add opp notification for SVS support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 09-12-19, 14:56, andrew-sh.cheng wrote:
> On Wed, 2019-11-27 at 14:06 +0530, Viresh Kumar wrote:
> > On 26-11-19, 19:50, Andrew-sh.Cheng wrote:
> > > +		if (!IS_ERR(opp_item))
> > > +			dev_pm_opp_put(opp_item);
> > > +		else
> > > +			freq = 0;
> > > +
> > 
> > What is the purpose of the above code ?
> When dev_pm_opp_find_freq_ceil() doesn't find matching opp item, freq
> value won't be set.
> Set it as 0 for below checking
> > 
> > > +		/* case of current opp is disabled */
> > > +		if (freq == 0 || freq != info->opp_freq) {
> > > +			// find an enable opp item
> > > +			freq = 1;
> > > +			opp_item = dev_pm_opp_find_freq_ceil(info->cpu_dev,
> > > +							     &freq);
> > > +			if (!IS_ERR(opp_item)) {
> > > +				dev_pm_opp_put(opp_item);
> > > +				policy = cpufreq_cpu_get(info->opp_cpu);
> > > +				if (policy) {
> > > +					cpufreq_driver_target(policy,
> > > +						freq / 1000,
> > > +						CPUFREQ_RELATION_L);
> > 
> > Why don't you simply call this instead of all the code in the else
> > block ?
> These else code is used to check "current opp item is disabled or not".
> If not, do nothing.
> If current opp item is disabled, need to find an not-disabled opp item,
> and set frequency to it.

Right. So this notifier helper of yours receive the opp which is getting
disabled, why don't you compare its frequency directly to see if the current OPP
is getting disabled ?

-- 
viresh



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux