From: Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
To: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
Cc: Rabin Vincent <rabin-66gdRtMMWGc@public.gmane.org>,
rjw-KKrjLPT3xs0@public.gmane.org,
linux-pm-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [linux-pm] pm_runtime_suspended() and non-pm_runtime-using (i2c) drivers
Date: Tue, 14 Dec 2010 16:40:59 +0000 [thread overview]
Message-ID: <20101214164059.GE5723@sirena.org.uk> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1012141114150.2087-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
On Tue, Dec 14, 2010 at 11:16:45AM -0500, Alan Stern wrote:
> I'm not familiar with the details of how the i2c subsystem works. But
> in general, the subsystem code should call pm_runtime_set_active()
> for every device before registering it. Then if a driver doesn't use
> any runtime-PM functions, pm_runtime_suspended() will return false.
Hrm, if that's the case then we also need to update at least the
platform and SPI buses. Though looking at the documentation this is
going to get a bit interesting as there's a requirement that the parent
has runtime PM enabled on it... It's certainly not terribly apparent
from the documentation.
It'd be really helpful if it were clearer what noop buses like this were
supposed to do to get runtime PM working.
next prev parent reply other threads:[~2010-12-14 16:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 15:54 pm_runtime_suspended() and non-pm_runtime-using (i2c) drivers Rabin Vincent
[not found] ` <AANLkTik7D2mDJN=BaasvLa4xx0fQBgjHREqQB06aD9JU-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-12-14 16:16 ` [linux-pm] " Alan Stern
[not found] ` <Pine.LNX.4.44L0.1012141114150.2087-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-12-14 16:40 ` Mark Brown [this message]
[not found] ` <20101214164059.GE5723-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2010-12-14 17:44 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1012141236530.2087-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-12-14 18:09 ` Mark Brown
[not found] ` <20101214180941.GB13644-HF5t3jzXg/6ND3a5+9QAFujbO/Zr0HzV@public.gmane.org>
2010-12-14 19:10 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1012141406500.2087-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-12-14 22:00 ` Mark Brown
[not found] ` <20101214220050.GB25106-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2010-12-14 23:03 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1012141754190.2087-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-12-14 23:19 ` Mark Brown
2010-12-15 0:15 ` Rafael J. Wysocki
2010-12-14 23:28 ` Rafael J. Wysocki
[not found] ` <201012150028.07938.rjw-KKrjLPT3xs0@public.gmane.org>
2010-12-14 23:57 ` Rafael J. Wysocki
[not found] ` <201012150057.31237.rjw-KKrjLPT3xs0@public.gmane.org>
2010-12-15 0:19 ` Rafael J. Wysocki
[not found] ` <201012150119.59801.rjw-KKrjLPT3xs0@public.gmane.org>
2010-12-15 20:38 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1012151530590.2171-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-12-15 22:01 ` Rafael J. Wysocki
[not found] ` <201012152301.18700.rjw-KKrjLPT3xs0@public.gmane.org>
2010-12-15 23:39 ` Rafael J. Wysocki
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