linux-kernel - Re: [RFC PATCH] mmc: Enable wakeup

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Message-ID: <CAME+o4=WrfpvJo=jN1KZ_JHnYq9Frfk3EPcwtG10=aCwrbY+Rw@mail.gmail.com>
Date:	Mon, 24 Jun 2013 12:58:39 -0700
From:	Zoran Markovic <zoran.markovic@...aro.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Colin Cross <ccross@...roid.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-mmc@...r.kernel.org,
	San Mehat <san@...gle.com>,
	John Stultz <john.stultz@...aro.org>,
	Chris Ball <cjb@...top.org>,
	Johan Rudholm <johan.rudholm@...ricsson.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Konstantin Dorfman <kdorfman@...eaurora.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] mmc: Enable wakeup_sources for mmc core

>> This patch is ported from the Android common tree, so you've probably
>> been using it.
>
> We removed more or less all Android code in the mmc subsystem, since
> it just didn't work. :-)
>
> The "deferred resume" was very useful though, so after some rework we
> kept it and could then improve the system resume time significantly.

For what it's worth, I fixed one bug I noticed in the Android kernel:
if a system has a non-removable MMC device, a suspend/resume cycle on
this device would hold a wake lock forever. This was a visible issue
on the panda board I am using.

If there are doubts on whether or not the system should stay awake
during a MMC mount, we have the option to make the calls to
wakeup_source_register/unregister configurable. Skipping these calls
would leave the .ws field NULL, in which case
__pm_stay_awake/__pm_relax/__pm_wakeup_event would do nothing.

Thoughts?

- Zoran
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