linux-kernel - Re: [PATCH] cpufreq: set value of CPUFREQ_BOOST

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Date:	Mon, 24 Mar 2014 14:03:20 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"ego@...ux.vnet.ibm.com" <ego@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [PATCH] cpufreq: set value of CPUFREQ_BOOST_FREQ to 0xABABABAB

On 24 March 2014 13:51, Lukasz Majewski <l.majewski@...sung.com> wrote:
> I think that a name of the patchset, for which the current setting
> causes problem would be welcome here.

I couldn't find a lkml link to the exact message earlier, but it was discussed
here:

https://patchwork.kernel.org/patch/3865481/

> Otherwise, I can only ask why it is not possible to add
> #define SPECIAL_SETTING ~3 ?

Driver wants to use this field for +ve and -ve values and it should be free
to do so.... And ~2 was creating problems when he used -3 for this field..
If we make it ~3, then he will face problem for -4..

So, I used a special value 0xABABABAB here whose integer value is:
-1414812757

The only other option we have is to add another field "bool boost" in
cpufreq_frequency_table, which is the last thing I wanted to do.

And that's the point Gautham was trying to make in one of our IRC
chats as well..
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