linux-kernel - Re: [PATCH 1/3] PM / OPP: Add support for descending order for cpufreq table

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Date:	Thu, 8 May 2014 11:25:34 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Jonghwan Choi <jhbird.choi@...sung.com>
Cc:	Nishanth Menon <nm@...com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>
Subject: Re: [PATCH 1/3] PM / OPP: Add support for descending order for
 cpufreq table

On 8 May 2014 07:37, Jonghwan Choi <jhbird.choi@...sung.com> wrote:

As asked earlier by Nishanth:

- Avoid top-posting (the practice of putting your answer above the quoted
  text you are responding to).  It makes your response harder to read and
  makes a poor impression.

Reference: Documentation/development-process/2.Process

> I believe that 3 item is required for DVFS. Those are frequency, voltage, divider value.

Not necessarily. People may need a multiplier as well or some other
configuration and so this stuff was left for drivers to implement.

> How about adding that divider value into struct dev_pm_opp like this;

Wouldn't work for all and so NAK.

> struct dev_pm_opp {
>         struct list_head node;
>
>         bool available;
>         unsigned long rate;
>         unsigned long u_volt;
>         unsigned int ctl[2]; // Added
>
>         struct device_opp *dev_opp;
>         struct rcu_head head;
> };

Always paste a diff, its impossible to read this :(

> In my test, it works very wel..

Working isn't enough :)

You don't have a complicated list of dividers, these are simple
values from 0 to total-num-of-freq -1 and that can be handled very
easily in your code.. Please do it there.
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