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SubjectRe: [PATCH v4 3/3] thermal: mediatek: Add cpu dynamic power cooling model.
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On Mon, 2015-11-30 at 11:08 +0530, Viresh Kumar wrote:
> On 27-11-15, 17:32, Dawei Chien wrote:
> > MT8173 cpufreq driver use of_cpufreq_power_cooling_register registering
> > cooling devices with dynamic power coefficient.
> >
> > Signed-off-by: Dawei Chien <dawei.chien@mediatek.com>
> > ---
> > This patch is base on patchset:
> > https://lkml.org/lkml/2015/11/17/251
> > ---
> > drivers/cpufreq/mt8173-cpufreq.c | 28 ++++++++++++++++++++--------
> > 1 file changed, 20 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/cpufreq/mt8173-cpufreq.c b/drivers/cpufreq/mt8173-cpufreq.c
> > index 83001dc..4d39468 100644
> > --- a/drivers/cpufreq/mt8173-cpufreq.c
> > +++ b/drivers/cpufreq/mt8173-cpufreq.c
> > @@ -263,24 +263,34 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
> > return 0;
> > }
> >
> > +#define DYNAMIC_POWER "dynamic-power-coefficient"
> > +
> > static void mtk_cpufreq_ready(struct cpufreq_policy *policy)
> > {
> > struct mtk_cpu_dvfs_info *info = policy->driver_data;
> > struct device_node *np = of_node_get(info->cpu_dev->of_node);
> > + u32 capacitance;
> >
> > if (WARN_ON(!np))
> > return;
> >
> > if (of_find_property(np, "#cooling-cells", NULL)) {
> > - info->cdev = of_cpufreq_cooling_register(np,
> > - policy->related_cpus);
> > + if (!info->cdev) {
>
> Why will info->cdev be non-NULL here ?

This is a error-checking to avoid user or any script by command line hotplug CPU
more than two times, we don't need to register cooling device on this case.

I will remove it if you don't agree it.

> > + of_property_read_u32(np, DYNAMIC_POWER, &capacitance);
>
> This can fail, in which case capacitance will be used uninitialized.
> Fix that by initializing it with 0 at the beginning of this routine.

Thank you, I will follow your comment to fix it on next version.

> > + info->cdev = of_cpufreq_power_cooling_register(np,
> > + policy->related_cpus,
> > + capacitance,
> > + NULL);
> >
> > - if (IS_ERR(info->cdev)) {
> > - dev_err(info->cpu_dev,
> > - "running cpufreq without cooling device: %ld\n",
> > - PTR_ERR(info->cdev));
> > + if (IS_ERR(info->cdev)) {
> > + dev_err(info->cpu_dev,
> > + "running cpufreq without cooling device: %ld\n",
> > + PTR_ERR(info->cdev));
> >
> > - info->cdev = NULL;
> > + info->cdev = NULL;
> > + }
> > }
> > }
> >
> > @@ -460,7 +470,9 @@ static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
> > {
> > struct mtk_cpu_dvfs_info *info = policy->driver_data;
> >
> > - cpufreq_cooling_unregister(info->cdev);
> > + if (info->cdev)
> > + cpufreq_cooling_unregister(info->cdev);
> > +
>
> Why do you need to update this?

This is a error-checking to avoid user or any script by command line
unplug CPU more than two times, we don't need to unregister cooling
device on this case.

I will remove it if you don't agree it.

> > dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
> > mtk_cpu_dvfs_info_release(info);
> > kfree(info);
> > --
> > 1.7.9.5
>




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