From: David Brownell <david-b@pacbell.net>
To: "Arve Hjønnevåg" <arve@android.com>,
"Alan Stern" <stern@rowland.harvard.edu>
Cc: Linux-pm mailing list <linux-pm@lists.linux-foundation.org>
Subject: Re: Wakeup-events implementation
Date: Tue, 17 Aug 2010 11:37:22 -0700 (PDT) [thread overview]
Message-ID: <324856.49167.qm@web180313.mail.gq1.yahoo.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1008171109030.1656-100000@iolanthe.rowland.org>
--- On Tue, 8/17/10, Alan Stern <stern@rowland.harvard.edu> wrote:
I wasn't
> aware that memory cards could generate wakeup events.
Almost all MMC/SD hardware can generate reliable
insert/remove events, in my experience. So MMC/SD
drivers I've modified tend to treat them as wake
events ... userspace can respond without polling
constantly "did it change yet, huh, did it???"
Unfortunately Pierre spent a lot of time hard-wiring
UNSAFE_RESUME assumptions into the MMC core, so lots
of that stuff is currently (and needlessly) broken.
And of more experimental interest, something I don't
recall being discussed here: I/O completions as
wake events. Start an I/O, enter low power state,
and wake when it completes. Easily done on lots of
embedded hardware..
next prev parent reply other threads:[~2010-08-17 18:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTimgJUAW9TU37XE4BqYWf3yCWvg-vgk3E0YLqcm9@mail.gmail.com>
2010-08-13 15:59 ` Wakeup-events implementation Alan Stern
2010-08-14 4:59 ` Arve Hjønnevåg
2010-08-16 19:22 ` Alan Stern
2010-08-17 0:30 ` Arve Hjønnevåg
2010-08-17 15:53 ` Alan Stern
2010-08-17 18:37 ` David Brownell [this message]
2010-08-17 19:19 ` Alan Stern
2010-08-17 19:21 ` Rafael J. Wysocki
2010-08-18 0:40 ` Arve Hjønnevåg
2010-08-18 10:32 ` Mark Brown
2010-08-18 15:20 ` Alan Stern
2010-08-18 19:17 ` Rafael J. Wysocki
2010-08-19 0:18 ` Arve Hjønnevåg
2010-08-19 21:09 ` Alan Stern
2010-08-19 23:12 ` Arve Hjønnevåg
2010-08-20 15:04 ` Alan Stern
2010-09-07 23:51 ` [RFC][PATCH] PM / Wakeup: Introduce wakeup source objects and event statistics (was: Re: Wakeup-events implementation) Rafael J. Wysocki
2010-08-18 7:04 ` Wakeup-events implementation Florian Mickler
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