Re: [PATCH v6 49/52] PM / devfreq: tegra20: Convert to EMC_STAT driver, support interconnect and device-tree

Chanwoo Choi
2020-11-03T02:08:57Z

On 11/3/20 5:08 AM, Dmitry Osipenko wrote:
> 01.11.2020 17:12, Dmitry Osipenko пишет:
> ...
>> We will probably move the Tegra20 EMC_STAT devfreq driver into the
>> memory driver and remove the older IMC_STAT driver in v7, like it was
>> suggested by Thierry Reding. This will be a much less invasive code change.
>>
>>> Also, if you want to get more responsiveness, you could use delayed timer
>>> instead of deferrable timer by editing the devfreq_dev_profile structure.
>>
>> Thanks, I'll try the deferrable timer.
>
> I took a brief look at the delayed timer and I think the deferrable
> timer should be more a preferred option because this devfreq drive is
> more an assistance for the optimal bandwidth selection and it will be
> more preferred to keep system idling whenever possible.
>
> My primary concern is the initial performance lag in a case of
> multimedia applications. But this will be resolved by hooking up
> performance voting to all drivers, once we will get around to it.

OK. You can choice the type of timer on both probe
and via sysfs file on the runtime.

--
Best Regards,
Chanwoo Choi
Samsung Electronics