On 08-01-20, 16:58, Saravana Kannan wrote:
> On Wed, Jan 8, 2020 at 3:19 AM Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> > > /**
> > > * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
> > > * @opp: opp for which level value has to be returned for
> > > @@ -299,6 +322,34 @@ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
> > > }
> > > EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
> > >
> > > +/**
> > > + * dev_pm_opp_get_suspend_opp_bw() - Get peak bandwidth of suspend opp in kBps
> >
> > Hmm, I wasn't expecting this. So the interconnects will also have a
> > suspend OPP ?
>
> Yes, device voting for interconnect paths might want to lower the
> bandwidth to a suspend bandwidth when they suspend.
That's exactly what I was saying, the request for a change during
suspend should come from the device and you can't do it here, i.e.
they should lower their frequency requirement, which should lead to a
low bandwidth automatically.
> > > + * @dev: device for which we do this operation
> > > + * @avg_bw: Pointer where the corresponding average bandwidth is stored.
> > > + * Can be NULL.
> > > + *
> > > + * Return: This function returns the peak bandwidth of the OPP marked as
> > > + * suspend_opp if one is available, else returns 0;
> > > + */
> > > +unsigned long dev_pm_opp_get_suspend_opp_bw(struct device *dev,
> > > + unsigned long *avg_bw)
> > > +{
> > > + struct opp_table *opp_table;
> > > + unsigned long peak_bw = 0;
> > > +
> > > + opp_table = _find_opp_table(dev);
> > > + if (IS_ERR(opp_table))
> > > + return 0;
> > > +
> > > + if (opp_table->suspend_opp && opp_table->suspend_opp->available)
> > > + peak_bw = dev_pm_opp_get_bw(opp_table->suspend_opp, avg_bw);
> > > +
> > > + dev_pm_opp_put_opp_table(opp_table);
> > > +
> > > + return peak_bw;
> > > +}
> > > +EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_bw);
> > > +
> > > int _get_opp_count(struct opp_table *opp_table)
> > > {
> > > struct dev_pm_opp *opp;
> > > @@ -343,6 +394,40 @@ int dev_pm_opp_get_opp_count(struct device *dev)
> > > }
> > > EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
> > >
> >
> > I think we should add function header here instead of the helpers
> > which get exact match for freq, bw or level. And then pass a enum
> > value to it, which tells what we are looking to compare. After that
> > rest of the routines will be just one liners, make them macros in
> > header file itself.
>
> Not sure I understand what you are saying here.
Okay, lemme try again with proper example.
enum opp_key_type {
OPP_KEY_FREQ = 0x1,
OPP_KEY_LEVEL= 0x2,
OPP_KEY_BW = 0x4,
OPP_KEY_ALL = 0x7,
}
/**
* Add function header here..
*/
struct dev_pm_opp *dev_pm_opp_find_opp_exact(struct device *dev,
enum opp_key_type key,
unsigned long key_value,
bool available)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
return ERR_PTR(r);
}
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available == available &&
!opp_compare_key(temp_opp, key, key_value)) {
opp = temp_opp;
/* Increment the reference count of OPP */
dev_pm_opp_get(opp);
break;
}
}
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
//Now in header file
#define dev_pm_opp_find_freq_exact(dev, freq, available) dev_pm_opp_find_opp_exact(dev, OPP_KEY_FREQ, freq, available);
#define dev_pm_opp_find_level_exact(dev, level, available) dev_pm_opp_find_opp_exact(dev, OPP_KEY_LEVEL, level, available);
#define dev_pm_opp_find_bw_exact(dev, bw, available) dev_pm_opp_find_opp_exact(dev, OPP_KEY_BW, bw, available);
--
viresh
