linux-kernel - Re: [PATCH] ARM: twd: Adjust localtimer frequency with cpufreq notifiers

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Date:	Fri, 4 Mar 2011 11:17:08 +0100
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-arm-kernel@...ts-infradead.org,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	Rickard ANDERSSON <Rickard.Andersson@...ricsson.com>,
	Rob Herring <robherring2@...il.com>,
	Russell King <linux@....linux.org.uk>,
	srinidhi kasagar <srinidhi.kasagar@...ricsson.com>,
	Varun Swara <Varun.Swara@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Martin Persson <martin.persson@...ricsson.com>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency with cpufreq notifiers

2010/11/18 Colin Cross <ccross@...roid.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@...aro.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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