linux-kernel - Re: [PATCH 5/7] clocksource/cadence_ttc: Overhaul clocksource frequency adjustment

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Message-ID: <2c13b204-2022-4091-95be-1749e8cc60b0@CH1EHSMHS026.ehs.local>
Date:	Wed, 13 Nov 2013 09:14:59 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 5/7] clocksource/cadence_ttc: Overhaul clocksource
 frequency adjustment

On Wed, Nov 13, 2013 at 01:33:52PM +0530, Viresh Kumar wrote:
> On 13 November 2013 00:31, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
> > Hmm, it could be interesting if Viresh can give its opinion on this patch
> > [cc'ed].
> 
> I am not sure if I understood the problem completely, but if this is about
> not allowing frequency transitions from cpufreq when we have started to
> suspend our system, then you must have a look at this thread:
> 
> https://lkml.org/lkml/2013/10/24/369

Thanks for the link. I had problems in that direction at some point too.
But the current issue, is not cpufreq changing the frequency, but our
suspend code in prepare_late() causes a frequency change of this timer
when the PLLs are powered down (it's done through a CCF clk_set_parent()
operation).

	Sören


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