From: "Niklas Söderlund" <niklas.soderlund@ragnatech.se>
To: Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Preventing PM from suspending device
Date: Mon, 9 Jan 2017 18:22:47 +0100 [thread overview]
Message-ID: <20170109172247.GI29854@bigcity.dyn.berto.se> (raw)
Hi Ulf and Linux PM,
I have a question regarding if a driver can signal to the PM core that
it should not be suspended from its struct dev_pm_ops suspend callback.
My use-case is the sh_eth driver which I have added Wake-on-Lan support
to, see [1]. In this driver I need to prevent the PM core to disable the
module clock to the device if WoL is enabled. Currently I call
clk_enable()/clk_disable() from the suspend/resume callbacks to modify
the usage count of the clock to prevent the clock from being switched
off by PM. This do not feel like the best solution to my problem.
Is there a more generic way to let PM know that I'm fine with the system
being suspended and I have suspended as much as I can but I'm a wake up source
so could please not switch of my clock and power domain?
1. https://marc.info/?l=linux-pm&m=148397620011501&w=2
--
Regards,
Niklas Söderlund
next reply other threads:[~2017-01-09 17:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-09 17:22 Niklas Söderlund [this message]
2017-01-11 23:19 ` Preventing PM from suspending device Ulf Hansson
2017-01-12 7:10 ` Geert Uytterhoeven
2017-01-12 17:02 ` Ulf Hansson
2017-01-13 9:38 ` Geert Uytterhoeven
2017-03-29 19:28 ` Niklas Söderlund
2017-03-30 16:44 ` Ulf Hansson
2017-03-30 20:35 ` Niklas Söderlund
2017-10-18 11:35 ` Geert Uytterhoeven
2017-10-18 12:06 ` Ulf Hansson
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