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Date: Fri, 13 May 2011 14:22:15 -0700
Message-ID: <BANLkTikBvHDsVEBdEYq618sPsbh=8V9L=Q@mail.gmail.com>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency withcpufreqnotifiers
From: Colin Cross <ccross@android.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Santosh Shilimkar <santosh.shilimkar@ti.com>,
        Russell King <linux@arm.linux.org.uk>,
        Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>,
        Harald Gustafsson <harald.gustafsson@ericsson.com>,
        linux-kernel@vger.kernel.org,
        Rickard ANDERSSON <rickard.andersson@stericsson.com>,
        martin persson <martin.persson@stericsson.com>,
        Varun Swara <Varun.Swara@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        =?ISO-8859-1?Q?Jonas_=C5berg?= <jonas.aberg@stericsson.com>
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On Fri, May 13, 2011 at 3:59 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> 2011/5/13 Thomas Gleixner <tglx@linutronix.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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