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References: <1290060899-9786-1-git-send-email-ccross@android.com>
Date: Fri, 4 Mar 2011 11:17:08 +0100
Message-ID: <AANLkTimCuV5N0jr8c949uONEvieQ5MDZ9KHDXtneG5AT@mail.gmail.com>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency with cpufreq notifiers
From: Linus Walleij <linus.ml.walleij@gmail.com>
To: Colin Cross <ccross@android.com>
Cc: linux-arm-kernel@lists-infradead.org,
        Harald Gustafsson <harald.gustafsson@ericsson.com>,
        Rickard ANDERSSON <Rickard.Andersson@stericsson.com>,
        Rob Herring <robherring2@gmail.com>,
        Russell King <linux@arm.linux.org.uk>,
        srinidhi kasagar <srinidhi.kasagar@stericsson.com>,
        Varun Swara <Varun.Swara@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Martin Persson <martin.persson@stericsson.com>
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2010/11/18 Colin Cross <ccross@android.com>:

> The clock to the ARM TWD local timer scales with the cpu
> frequency. To allow the cpu frequency to change while
> maintaining a constant TWD frequency, pick a lower target
> frequency for the TWD and use the prescaler to divide down
> to the closest lower frequency.

We are using this with some custom hooks for the U8500.

Tested-by: Linus Walleij <linus.walleij@linaro.org>

Martin Persson can probably provide an additional Tested-by
from ST-Ericsson if it helps.

Colin are you merging this patch for 2.6.39 through
Russells tracker or pull request? It's an important patch
for us.

Yours,
Linus Walleij
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