From: Tomasz Figa <tomasz.figa@gmail.com>
To: Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
linux-pm@vger.kernel.org,
Geert Uytterhoeven <geert+renesas@glider.be>,
Philipp Zabel <philipp.zabel@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
Mark Brown <broonie@kernel.org>, Wolfram Sang <wsa@the-dreams.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Jack Dai <jack.dai@rock-chips.com>,
Jinkun Hong <jinkun.hong@rock-chips.com>,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>
Subject: Re: [PATCH 2/4] ARM: exynos: Ensure PM domains are powered at initialization
Date: Wed, 01 Oct 2014 13:23:46 +0200 [thread overview]
Message-ID: <542BE442.9040505@gmail.com> (raw)
In-Reply-To: <7hiok5x8k1.fsf@deeprootsystems.com>
On 30.09.2014 20:33, Kevin Hilman wrote:
> Ulf Hansson <ulf.hansson@linaro.org> writes:
>
>> At ->probe() it's common practice for drivers/subsystems to bring their
>> devices to full power and without depending on CONFIG_PM_RUNTIME.
>>
>> We could also expect that drivers/subsystems requires their device's
>> corresponding PM domains to be powered, to successfully complete a
>> ->probe() sequence.
>>
>> Align to the behavior above, by ensuring all PM domains are powered
>> prior initialization of a generic PM domain.
>>
>> Do note, since the generic PM domain will try to power off unused PM
>> domains at late_init, there are no increased power consumption over
>> time.
>
> IMO "no increased power consumption" is a bit misleading because
> boot-time power consumption may have a major increase when all power
> domains are powered on. Sure, they will eventually (hopefully) be
> turned off in after late_initcall, but there will still be an impact.
>
> I guess the Samsung folks should comment here on whether that is
> significant.
Unfortunately this series has not been posted to linux-samsung-soc
mailing list and I'm a formerly-Samsung folk now, so it hasn't really
reached there.
Best regards,
Tomasz
next prev parent reply other threads:[~2014-10-01 11:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-30 12:43 [PATCH 0/4] PM / Domains: Fix race conditions during boot Ulf Hansson
2014-09-30 12:43 ` [PATCH 1/4] PM / Domains: Remove pm_genpd_dev_need_restore() API Ulf Hansson
2014-09-30 13:21 ` Geert Uytterhoeven
2014-09-30 18:07 ` Kevin Hilman
2014-09-30 12:43 ` [PATCH 2/4] ARM: exynos: Ensure PM domains are powered at initialization Ulf Hansson
2014-09-30 18:33 ` Kevin Hilman
2014-10-01 11:23 ` Tomasz Figa [this message]
2014-10-01 12:45 ` Ulf Hansson
2014-09-30 12:43 ` [PATCH 3/4] PM / Domains: Expect PM domains being " Ulf Hansson
2014-09-30 13:24 ` Geert Uytterhoeven
2014-09-30 18:21 ` Kevin Hilman
2014-10-01 11:09 ` Ulf Hansson
2014-09-30 18:30 ` Kevin Hilman
2014-10-01 10:47 ` Ulf Hansson
2014-09-30 12:43 ` [PATCH 4/4] PM / Domains: Enforce PM domains to stay powered during boot Ulf Hansson
2014-09-30 20:08 ` [PATCH 0/4] PM / Domains: Fix race conditions " Rafael J. Wysocki
2014-10-01 7:35 ` Ulf Hansson
2014-10-01 20:31 ` Rafael J. Wysocki
2014-10-02 9:28 ` Ulf Hansson
2014-10-02 10:07 ` Ulf Hansson
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