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

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Message-ID: <AANLkTin7ZXYALOy_jk1uR3SbZA51nSnU-ncSjG+n_RPn@mail.gmail.com>
Date:	Fri, 4 Mar 2011 12:11:32 -0800
From:	Colin Cross <ccross@...roid.com>
To:	martin persson <martin.persson@...ricsson.com>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	"linux-arm-kernel@...ts-infradead.org" 
	<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-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency with cpufreq notifiers

On Fri, Mar 4, 2011 at 2:27 AM, martin persson
<martin.persson@...ricsson.com> wrote:
> We've seen no problems using this patch and have been grateful for it's
> existence. So I'm happy to put:
>
> Tested-by: martin.persson@...ricsson.com
>
> /Martin
>
> On 03/04/2011 11:17 AM, Linus Walleij wrote:
>>
>> 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
>

I never got any responses, and it conflicts with Rob Herring's patch
6434/1, although that has not been applied.  Russell, do you want this
in the patch tracker?
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