linux-kernel - Re: [PATCH v4 0/6] cpufreq: use generic cpufreq drivers for Exynos4x12 platform

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Message-id: <2061119.GBaoSb4YSL@amdc1976>
Date:	Fri, 07 Aug 2015 13:31:15 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	'Thomas Abraham' <thomas.ab@...sung.com>,
	'Sylwester Nawrocki' <s.nawrocki@...sung.com>,
	'Michael Turquette' <mturquette@...libre.com>,
	'Tomasz Figa' <tomasz.figa@...il.com>,
	'Lukasz Majewski' <l.majewski@...sung.com>,
	'Heiko Stuebner' <heiko@...ech.de>,
	'Chanwoo Choi' <cw00.choi@...sung.com>,
	'Kevin Hilman' <khilman@...aro.org>,
	'Javier Martinez Canillas' <javier@...hile0.org>,
	'Tobias Jakobi' <tjakobi@...h.uni-bielefeld.de>,
	'Anand Moon' <linux.amoon@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/6] cpufreq: use generic cpufreq drivers for Exynos4x12
 platform


Hi,

On Friday, August 07, 2015 10:48:26 AM Viresh Kumar wrote:
> On 07-08-15, 13:52, Krzysztof Kozlowski wrote:
> > Thanks for explanation. As fair as I understand, Bartlomiej wanted to
> > merge this in a way which would avoid loosing the boost mode. Kukjin
> > prepared topic branches for previous cpu-freq/clk stuff so maybe
> > everything could go through PM?
> 
> We aren't loosing anything at all. There can be two cases here:
> 
> 1. Patch 1/6 and 6/6 make it to 4.3 (with suggested changes) via PM tree:
> - All will work fine in this case, no issues at all..
> 
> 2. They don't make it:
> - Even in this case, nothing will break. Users can just enable a
>   config option and that's all..

Users don't need to enable the config option to get boost
functionality working.  It is only needed to get scaling_boost_freqs
sysfs attribute visible (which lists available boost freqs) when
using cpufreq-dt driver.  Also the config option in question is not
user visible.

The worst thing that happens if these 2 PM patches don't make it
in time is that there will be no scaling_boost_freqs available
when using cpufreq-dt driver.  Which is not very important from
Exynos4x12 POV as it only supports single boost freq currently.

> So, no need to divert things into another tree this late.

I agree.

> Over that, Rafael will not be around for 2 weeks now (Plumbers and
> other stuff) ..
> 
> So, just target the cpufreq core changes via PM tree.. rest is just
> fine.
> 
> I hope that makes sense :)

Yes. :)
 
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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