linux-kernel - Re: [PATCH] clk: mediatek: Export CPU mux clocks for CPU frequency control

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Message-ID: <CAKohpon-zbFdymPvzcAf0OK1wuCq_ShbdFKFXySb-ToMpZCMEg@mail.gmail.com>
Date:	Thu, 12 Mar 2015 14:52:51 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Mike Turquette <mturquette@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Pi-Cheng Chen <pi-cheng.chen@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Henry Chen <henryc.chen@...iatek.com>,
	James Liao <jamesjj.liao@...iatek.com>,
	Chen Fan <fan.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clk: mediatek: Export CPU mux clocks for CPU frequency control

On 11 March 2015 at 05:29, Mike Turquette <mturquette@...aro.org> wrote:
> I assume you are saying that you want to update loops-per-jiffie while
> at an intermediate frequency. Why? This operation should not take very
> long.
>
> Imagine a (hypothetical?) processor that changes frequency in many small
> steps until it converges to the target rate. Would you want to update
> lpj for every step?

That's why I have asked Russell specifically about this but haven't got a reply
yet. But it looks wrong to me as well now.. Probably we don't need to care
about it at all..
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