From: Kevin Hilman <khilman@baylibre.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Alan Stern <stern@rowland.harvard.edu>,
linux-pm@vger.kernel.org, Len Brown <len.brown@intel.com>,
Pavel Machek <pavel@ucw.cz>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Lina Iyer <lina.iyer@linaro.org>,
Jon Hunter <jonathanh@nvidia.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Andy Gross <andy.gross@linaro.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH V3] PM / Runtime: Defer resuming of the device in pm_runtime_force_resume()
Date: Fri, 18 Nov 2016 14:34:50 -0800 [thread overview]
Message-ID: <m2h974quwl.fsf@baylibre.com> (raw)
In-Reply-To: <1476370734-23168-1-git-send-email-ulf.hansson@linaro.org> (Ulf Hansson's message of "Thu, 13 Oct 2016 16:58:54 +0200")
Ulf Hansson <ulf.hansson@linaro.org> writes:
> When the pm_runtime_force_suspend|resume() helpers were invented, we still
> had CONFIG_PM_RUNTIME and CONFIG_PM_SLEEP as separate Kconfig options.
>
> To make sure these helpers worked for all combinations and without
> introducing too much of complexity, the device was always resumed in
> pm_runtime_force_resume().
>
> More precisely, when CONFIG_PM_SLEEP was set and CONFIG_PM_RUNTIME was
> unset, we needed to resume the device as the subsystem/driver couldn't
> rely on using runtime PM to do it.
>
> As the CONFIG_PM_RUNTIME option was merged into CONFIG_PM a while ago, it
> removed this combination, of using CONFIG_PM_SLEEP without the earlier
> CONFIG_PM_RUNTIME.
>
> For this reason we can now rely on the subsystem/driver to use runtime PM
> to resume the device, instead of forcing that to be done in all cases. In
> other words, let's defer the runtime resume to a later point when it's
> actually needed.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Kevin Hilman <khilman@baylibre.com>
prev parent reply other threads:[~2016-11-18 22:34 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161013145916eucas1p1b93e63340fe16491a1d53d6e8d9a5f93@eucas1p1.samsung.com>
2016-10-13 14:58 ` [PATCH V3] PM / Runtime: Defer resuming of the device in pm_runtime_force_resume() Ulf Hansson
2016-10-18 10:32 ` Marek Szyprowski
2016-10-21 8:26 ` Ulf Hansson
2016-10-18 13:50 ` Geert Uytterhoeven
2016-10-21 8:42 ` Ulf Hansson
2016-10-21 8:51 ` Geert Uytterhoeven
2016-11-17 20:21 ` Ulf Hansson
2016-11-17 21:00 ` Rafael J. Wysocki
2016-11-18 10:50 ` Ulf Hansson
2016-11-18 23:13 ` Rafael J. Wysocki
2016-11-24 1:14 ` Rafael J. Wysocki
2016-11-18 8:07 ` Geert Uytterhoeven
2016-11-18 22:34 ` Kevin Hilman [this message]
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