From: kgene.kim@samsung•com (Kukjin Kim)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2] arm: exynos: Support cluster power off on exynos5420/5800
Date: Wed, 25 Jun 2014 19:14:53 +0900 [thread overview]
Message-ID: <01b501cf905e$4e95cf00$ebc16d00$@samsung.com> (raw)
In-Reply-To: <7hy4wsvdsm.fsf@paris.lan>
Kevin Hilman wrote:
>
> Abhilash Kesavan <a.kesavan@samsung•com> writes:
>
Hi,
> > Turning off a cluster when all 4 cores of the cluster are powered off
> > saves power significantly. Powering off the A15 L2 alone gives around
> > 100mW in savings. Add support for powering off the A15/A7 clusters on
> > exynos5420/5800.
> >
> > The patch enables specific register bits which ensure that:
> > - cluster L2 will be turned on before the first man is powered up.
> > - last man will be turned off before the cluster L2 is turned off.
> > - core is powered down before powering it up.
> >
> > Remove the exynos_cluster_power_control function completely as we can
> > rely on the above mentioned bits rather than polling the cluster power
> > status register.
> >
> > Signed-off-by: Abhilash Kesavan <a.kesavan@samsung•com>
> > Acked-by: Nicolas Pitre <nico@linaro•org>
> > ---
> > Change in v2:
> > Added a macro for the COMMON_OPTION register and used it in the MCPM
> > back-end.
> >
> > The patch is based on Linux-next 20140619. It has been tested on an
> > exynos5420-based chromebook using the "/dev/bL_switcher" interface as
> > well as the script provided by Nicolas Pitre and Dave Martin [1].
> >
> > Patch depends on:
> > [v2] ARM: EXYNOS: mcpm: Don't rely on firmware's secondary_cpu_start
> >
> > [1] http://www.spinics.net/lists/linux-samsung-soc/msg31257.html
>
> Tested on exynos5800/Chromebook2 along with the dependency patch and using
> the script from Dave and Nico.
>
> Tested-by: Kevin Hilman <khilman@linaro•org>
>
Kevin, thanks for your test on the board ;-)
Applied into samsung tree.
Thanks,
Kukjin
prev parent reply other threads:[~2014-06-25 10:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-18 15:18 [PATCH] arm: exynos: Support cluster power off on exynos5420/5800 Abhilash Kesavan
2014-06-18 15:40 ` Nicolas Pitre
2014-06-19 12:23 ` Abhilash Kesavan
2014-06-19 12:40 ` [PATCH v2] " Abhilash Kesavan
2014-06-19 20:34 ` Kevin Hilman
2014-06-25 10:14 ` Kukjin Kim [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='01b501cf905e$4e95cf00$ebc16d00$@samsung.com' \
--to=kgene.kim@samsung$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox