From: Mark Brown <broonie@kernel.org>
To: Kevin Hilman <khilman@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org,
Geert Uytterhoeven <geert+renesas@glider.be>,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tomasz Figa <tomasz.figa@gmail.com>,
Simon Horman <horms@verge.net.au>,
Magnus Damm <magnus.damm@gmail.com>,
Ben Dooks <ben-linux@fluff.org>,
Kukjin Kim <kgene.kim@samsung.com>,
Philipp Zabel <philipp.zabel@gmail.com>,
Wolfram Sang <wsa@the-dreams.de>,
Russell King <linux@arm.linux.org.uk>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Jack Dai <jack.dai@rock-chips.com>,
Jinkun Hong <jinkun.hong@rock-chips.com>,
Aaron Lu <aaron.lu@intel.com>,
Sylwester Nawrocki <s.nawrocki@samsung.com>
Subject: Re: [PATCH v3 0/9] PM / Domains: Fix race conditions during boot
Date: Fri, 24 Oct 2014 17:18:04 +0100 [thread overview]
Message-ID: <20141024161804.GH3729@sirena.org.uk> (raw)
In-Reply-To: <7hd29h8n0o.fsf@deeprootsystems.com>
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On Fri, Oct 24, 2014 at 09:12:39AM -0700, Kevin Hilman wrote:
> Ulf Hansson <ulf.hansson@linaro.org> writes:
> > There may be more than one device in a PM domain which then will be
> > probed at different points in time.
> > Depending on timing and runtime PM support, in for the device related
> > driver/subsystem, a PM domain may be advised to power off after a
> > successful probe sequence.
> > A general requirement for a device within a PM domain, is that the
> > PM domain must stay powered during the probe sequence. To cope with
> > such requirement, let's add two new APIs, dev_pm_domain_get|put().
> I'm confused. Why arent' pm_runtime_get*() and pm_runtime_put*() working?
> What's not explained here (or what I'm not understanding) is why a PM
> domain is powering off if it has active devices.
The issue AIUI is what happens during system boot - if one device in a
domain probes and marks itself runtime idle then that will trigger
domain powerdown even if there is another device in the domain that
hasn't yet been probed. This can cause undesirable glitches (or worse)
during boot depending on what's getting powered down.
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next prev parent reply other threads:[~2014-10-24 16:18 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-13 14:02 [PATCH v3 0/9] PM / Domains: Fix race conditions during boot Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 1/9] PM / Domains: Add dev_pm_domain_get|put() APIs Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 2/9] PM / Domains: Enable genpd to support ->get|put() callbacks Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 3/9] amba: Keep PM domain powered during ->probe() Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 4/9] drivercore / platform: " Ulf Hansson
2014-10-30 20:47 ` Kevin Hilman
2014-10-31 0:07 ` Dmitry Torokhov
2014-10-31 9:23 ` Ulf Hansson
2014-11-01 0:21 ` Rafael J. Wysocki
2014-10-31 9:19 ` Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 5/9] i2c: core: " Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 6/9] spi: " Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 7/9] mmc: core: Attach PM domain prior probing of SDIO func driver Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 8/9] mmmc: core: Keep PM domain powered during ->probe() " Ulf Hansson
2014-10-13 14:02 ` [PATCH v3 9/9] PM / Domains: Remove pm_genpd_dev_need_restore() API Ulf Hansson
2014-10-24 16:12 ` [PATCH v3 0/9] PM / Domains: Fix race conditions during boot Kevin Hilman
2014-10-24 16:18 ` Mark Brown [this message]
2014-10-30 20:46 ` Kevin Hilman
2014-10-30 23:56 ` Mark Brown
2014-10-31 9:16 ` Ulf Hansson
2014-11-01 0:20 ` Rafael J. Wysocki
2014-11-01 1:08 ` pm_runtime_enable() in ->probe() (was: Re: [PATCH v3 0/9] PM / Domains: Fix race conditions during boot) Rafael J. Wysocki
2014-11-01 1:14 ` Rafael J. Wysocki
2014-11-03 17:00 ` pm_runtime_enable() in ->probe() Kevin Hilman
2014-11-03 20:06 ` Alan Stern
2014-11-04 0:00 ` Rafael J. Wysocki
2014-11-04 16:45 ` Alan Stern
2014-11-03 23:55 ` Rafael J. Wysocki
2014-11-01 15:15 ` pm_runtime_enable() in ->probe() (was: Re: [PATCH v3 0/9] PM / Domains: Fix race conditions during boot) Alan Stern
2014-11-04 0:09 ` Rafael J. Wysocki
2014-11-04 1:23 ` Rafael J. Wysocki
2014-11-03 14:03 ` [PATCH v3 0/9] PM / Domains: Fix race conditions during boot Ulf Hansson
2014-11-04 1:43 ` Rafael J. Wysocki
2014-11-04 8:20 ` Geert Uytterhoeven
2014-11-04 13:32 ` Rafael J. Wysocki
2014-11-04 8:54 ` Ulf Hansson
2014-11-04 9:05 ` Dmitry Torokhov
2014-11-04 9:24 ` Ulf Hansson
2014-11-04 13:56 ` Rafael J. Wysocki
2014-11-04 17:01 ` Ulf Hansson
2014-11-04 18:29 ` Dmitry Torokhov
2014-11-04 21:38 ` Rafael J. Wysocki
2014-11-05 8:17 ` Ulf Hansson
2014-11-04 13:52 ` Rafael J. Wysocki
2014-11-04 13:51 ` Rafael J. Wysocki
2014-11-04 16:42 ` Ulf Hansson
2014-11-07 17:25 ` Grygorii Strashko
2014-11-11 11:05 ` Ulf Hansson
2014-11-12 18:01 ` Grygorii Strashko
2014-11-13 2:07 ` Rafael J. Wysocki
2014-11-13 20:13 ` Grygorii Strashko
2014-11-13 14:05 ` Pavel Machek
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