linux-kernel - Re: [PATCH] ARM: twd: Adjust localtimer frequency withcpufreqnotifiers

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Message-ID: <BANLkTikBvHDsVEBdEYq618sPsbh=8V9L=Q@mail.gmail.com>
Date:	Fri, 13 May 2011 14:22:15 -0700
From:	Colin Cross <ccross@...roid.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Russell King <linux@....linux.org.uk>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	linux-kernel@...r.kernel.org,
	Rickard ANDERSSON <rickard.andersson@...ricsson.com>,
	martin persson <martin.persson@...ricsson.com>,
	Varun Swara <Varun.Swara@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Jonas Åberg <jonas.aberg@...ricsson.com>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency withcpufreqnotifiers

On Fri, May 13, 2011 at 3:59 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> 2011/5/13 Thomas Gleixner <tglx@...utronix.de>:
>
>> Does the following work for you ?
>
> This patch is interesting because it uses calc_mult_shift() and the current
> localtimer driver for TWD (arch/arm/kernel/smp_twd.c) still uses hardcoded
> mult+shift.
>
> So this patch in combination with TGLX add-on in the CPUfreq path would
> eliminate the need of using the prescaler at all, which is a more appealing
> solution to me for one, since it results in less code.
>
> Colin, do you think it will work? Or was there some specific reason to use
> a dynamic prescaler instead of doing things like this?

This sounds much better than the dynamic prescaler.  Using the
prescaler causes issues with accuracy and resolution that this avoids.
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