From: Alan Stern <stern@rowland.harvard.edu>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Arjan van de Ven" <arjan@infradead.org>,
"pm list" <linux-pm@lists.linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
"Arve Hjønnevåg" <arve@android.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Pavel Machek" <pavel@ucw.cz>,
"Nigel Cunningham" <nigel@nigel.suspend2.net>,
"Matthew Garrett" <mjg59@srcf.ucam.org>,
"mark gross" <mgross@linux.intel.com>,
"Woodruff, Richard" <r-woodruff2@ti.com>,
"Uli Luckas" <u.luckas@road.de>,
"Igor Stoppa" <igor.stoppa@nokia.com>,
"Brian Swetland" <swetland@google.com>,
"Len Brown" <lenb@kernel.org>
Subject: Re: [RFD] Automatic suspend
Date: Mon, 16 Feb 2009 17:40:10 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.44L0.0902161736210.21117-100000@netrider.rowland.org> (raw)
In-Reply-To: <200902162312.50556.rjw@sisk.pl>
On Mon, 16 Feb 2009, Rafael J. Wysocki wrote:
> OK, so I think there are two things that user space may be allowed to do as
> far as putting devices into low power states is concerned:
> * disable/enable the automatic power management of the device (provided that
> the driver supports the automatic PM)
Set the automatic PM parameters (idle timeout, state to go to, etc.).
And disabling automatic PM altogether (effectively the same as setting
the idle timeout to infinity).
> * check what power states devices are in.
What about situations where we want to distinguish between the power
state of the device itself and the power state of the link? For a disk
drive we may want to power the link on and off quite a lot, as that
has low latency, but spinning the disk up and down takes a long time
and so should have a longer idle-time value.
Alan Stern
next prev parent reply other threads:[~2009-02-16 22:40 UTC|newest]
Thread overview: 195+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-15 23:10 [RFD] Automatic suspend Rafael J. Wysocki
2009-02-16 0:44 ` Arjan van de Ven
2009-02-16 2:12 ` Benjamin Herrenschmidt
2009-02-16 2:20 ` Arjan van de Ven
2009-02-16 3:23 ` Benjamin Herrenschmidt
2009-02-16 3:30 ` Arjan van de Ven
2009-02-16 23:05 ` Pavel Machek
2009-02-16 7:06 ` Oliver Neukum
2009-02-16 15:40 ` Arjan van de Ven
2009-02-16 16:48 ` Oliver Neukum
2009-02-16 17:31 ` Arjan van de Ven
2009-02-16 20:08 ` Kyle Moffett
2009-02-16 20:28 ` Arjan van de Ven
2009-02-16 20:39 ` Alan Stern
2009-02-16 20:45 ` Arjan van de Ven
2009-02-16 21:32 ` Woodruff, Richard
2009-02-16 21:52 ` Arjan van de Ven
2009-02-16 22:36 ` Woodruff, Richard
2009-02-16 22:59 ` Arjan van de Ven
2009-02-16 23:19 ` Rafael J. Wysocki
2009-02-16 23:23 ` Matthew Garrett
2009-02-17 10:12 ` Oliver Neukum
2009-02-17 13:58 ` Mark Brown
2009-02-17 14:20 ` Brian Swetland
2009-02-17 14:24 ` Matthew Garrett
2009-02-17 14:56 ` Oliver Neukum
2009-02-17 14:46 ` Arjan van de Ven
2009-02-17 14:51 ` Matthew Garrett
2009-02-17 14:56 ` Arjan van de Ven
2009-02-17 15:32 ` Woodruff, Richard
2009-02-18 0:04 ` Arjan van de Ven
2009-02-18 0:18 ` Woodruff, Richard
2009-02-18 5:35 ` Arjan van de Ven
2009-02-18 0:52 ` mark gross
2009-02-18 5:11 ` Arve Hjønnevåg
2009-02-18 5:55 ` Arjan van de Ven
2009-02-18 15:15 ` Matthew Garrett
2009-02-18 15:20 ` Woodruff, Richard
2009-02-17 14:58 ` Igor Stoppa
2009-02-17 15:28 ` Brian Swetland
2009-02-18 0:55 ` mark gross
2009-02-18 2:40 ` Benjamin Herrenschmidt
2009-02-18 17:48 ` Jesse Barnes
2009-02-18 17:52 ` Matthew Garrett
2009-02-18 18:01 ` Jesse Barnes
2009-02-18 22:05 ` Benjamin Herrenschmidt
2009-03-01 22:51 ` Pavel Machek
2009-02-27 10:00 ` Pavel Machek
2009-02-18 0:45 ` mark gross
2009-02-20 5:35 ` Arve Hjønnevåg
2009-02-20 15:27 ` Arjan van de Ven
2009-02-20 18:22 ` Pavel Machek
2009-02-20 18:26 ` Matthew Garrett
2009-02-20 20:49 ` Rafael J. Wysocki
2009-02-20 22:43 ` Arve Hjønnevåg
2009-02-16 23:41 ` Arjan van de Ven
2009-02-16 23:08 ` Rafael J. Wysocki
2009-02-17 3:09 ` Alan Stern
2009-02-17 23:21 ` Rafael J. Wysocki
2009-02-18 4:46 ` Arve Hjønnevåg
2009-02-18 21:17 ` Rafael J. Wysocki
2009-02-18 22:35 ` Arve Hjønnevåg
2009-02-18 22:44 ` Oliver Neukum
2009-02-18 23:04 ` Rafael J. Wysocki
2009-02-18 23:31 ` Alan Stern
2009-02-19 12:56 ` Rafael J. Wysocki
2009-02-19 14:59 ` Alan Stern
2009-02-19 21:15 ` Rafael J. Wysocki
2009-02-19 21:56 ` Brian Swetland
2009-02-19 22:08 ` Alan Stern
2009-02-19 22:21 ` Rafael J. Wysocki
2009-02-19 22:58 ` Oliver Neukum
2009-02-20 10:46 ` Rafael J. Wysocki
2009-02-20 22:05 ` Oliver Neukum
2009-02-20 22:44 ` Rafael J. Wysocki
2009-02-20 23:11 ` Arve Hjønnevåg
2009-02-20 23:20 ` Oliver Neukum
2009-02-21 1:59 ` Arve Hjønnevåg
2009-02-20 2:39 ` Arve Hjønnevåg
2009-02-20 10:49 ` Rafael J. Wysocki
2009-02-20 11:26 ` Arve Hjønnevåg
2009-02-20 15:56 ` Rafael J. Wysocki
2009-02-20 16:07 ` Kyle Moffett
2009-02-20 20:56 ` Rafael J. Wysocki
2009-02-20 21:02 ` Rafael J. Wysocki
2009-02-20 23:03 ` Arve Hjønnevåg
2009-02-20 23:57 ` Rafael J. Wysocki
2009-02-21 1:08 ` Arve Hjønnevåg
2009-02-21 9:47 ` Rafael J. Wysocki
2009-02-21 10:32 ` Arve Hjønnevåg
2009-02-21 20:20 ` Rafael J. Wysocki
2009-02-23 23:13 ` Arve Hjønnevåg
2009-02-23 23:53 ` Rafael J. Wysocki
2009-02-24 0:02 ` Arve Hjønnevåg
2009-02-27 10:12 ` Pavel Machek
2009-02-27 10:09 ` Pavel Machek
2009-02-27 14:22 ` Rafael J. Wysocki
2009-02-27 14:29 ` Matthew Garrett
2009-02-27 20:54 ` Rafael J. Wysocki
2009-02-27 22:09 ` Arve Hjønnevåg
2009-02-27 22:55 ` Rafael J. Wysocki
2009-02-27 20:40 ` Pavel Machek
2009-02-27 20:55 ` Rafael J. Wysocki
2009-02-27 22:56 ` Arve Hjønnevåg
2009-02-27 23:44 ` Pavel Machek
2009-02-28 3:04 ` Arve Hjønnevåg
2009-02-28 10:18 ` Rafael J. Wysocki
2009-02-28 21:57 ` Arve Hjønnevåg
2009-02-28 22:53 ` Rafael J. Wysocki
2009-02-28 23:38 ` Arve Hjønnevåg
2009-03-01 23:17 ` Rafael J. Wysocki
2009-03-02 23:48 ` Arve Hjønnevåg
2009-03-03 22:39 ` Rafael J. Wysocki
2009-03-03 23:38 ` Arve Hjønnevåg
2009-03-04 0:49 ` Pavel Machek
2009-03-01 0:06 ` Arve Hjønnevåg
2009-03-01 6:28 ` Benjamin Herrenschmidt
2009-03-01 9:11 ` Rafael J. Wysocki
2009-03-01 9:20 ` Rafael J. Wysocki
2009-03-03 1:22 ` Arve Hjønnevåg
2009-03-03 13:51 ` Pavel Machek
2009-03-04 0:06 ` Arve Hjønnevåg
2009-03-04 0:47 ` Pavel Machek
2009-03-01 23:08 ` Pavel Machek
2009-03-03 13:57 ` Pavel Machek
2009-03-03 23:51 ` Arve Hjønnevåg
2009-02-20 23:12 ` Oliver Neukum
2009-02-20 23:40 ` Rafael J. Wysocki
2009-02-20 23:45 ` Matthew Garrett
2009-02-21 9:52 ` Rafael J. Wysocki
2009-02-21 16:52 ` Alan Stern
2009-02-21 21:14 ` Rafael J. Wysocki
2009-02-27 10:16 ` Pavel Machek
2009-02-27 14:46 ` Alan Stern
2009-02-27 20:58 ` Rafael J. Wysocki
2009-02-22 14:03 ` Pavel Machek
2009-02-23 14:04 ` Oliver Neukum
2009-02-27 10:18 ` Pavel Machek
2009-02-27 15:22 ` Oliver Neukum
2009-03-05 16:54 ` Pavel Machek
2009-02-27 17:09 ` Chris Friesen
2009-02-27 20:46 ` Pavel Machek
2009-03-05 13:48 ` Pavel Machek
2009-03-01 22:56 ` Pavel Machek
2009-03-02 8:24 ` Oliver Neukum
2009-03-02 14:34 ` Pavel Machek
2009-03-02 15:13 ` Arjan van de Ven
2009-02-16 23:20 ` Oliver Neukum
2009-02-20 18:05 ` Pavel Machek
2009-02-16 6:23 ` Roland Dreier
2009-02-16 15:38 ` Arjan van de Ven
2009-02-16 22:47 ` Pavel Machek
2009-02-16 7:02 ` Oliver Neukum
2009-02-16 21:48 ` Rafael J. Wysocki
2009-02-16 21:52 ` Peter Zijlstra
2009-02-16 21:53 ` Arjan van de Ven
2009-02-16 22:12 ` Rafael J. Wysocki
2009-02-16 22:40 ` Alan Stern [this message]
2009-02-16 22:56 ` Arjan van de Ven
2009-02-16 23:28 ` Rafael J. Wysocki
2009-02-17 2:43 ` Alan Stern
2009-02-17 2:57 ` Arjan van de Ven
2009-02-17 3:26 ` Alan Stern
2009-02-16 23:02 ` Rafael J. Wysocki
2009-02-17 2:56 ` Alan Stern
2009-02-17 23:26 ` Rafael J. Wysocki
2009-02-18 8:53 ` Oliver Neukum
2009-02-18 14:51 ` Arjan van de Ven
2009-02-18 15:05 ` Oliver Neukum
2009-02-18 15:10 ` Alan Stern
2009-02-18 15:55 ` Oliver Neukum
2009-02-18 16:39 ` Alan Stern
2009-02-18 17:10 ` Oliver Neukum
2009-02-18 15:09 ` Alan Stern
2009-02-16 22:51 ` Pavel Machek
2009-02-16 22:55 ` Arjan van de Ven
2009-02-16 23:00 ` Rafael J. Wysocki
2009-02-16 23:18 ` Pavel Machek
2009-02-16 23:29 ` Oliver Neukum
2009-02-16 22:58 ` Pavel Machek
2009-02-16 23:13 ` Matthew Garrett
2009-02-16 23:22 ` Pavel Machek
2009-02-16 23:26 ` Matthew Garrett
2009-02-17 14:14 ` Brian Swetland
2009-02-17 14:19 ` Matthew Garrett
2009-02-17 21:57 ` mark gross
2009-02-17 22:04 ` Matthew Garrett
2009-02-17 22:19 ` Jesse Barnes
2009-02-17 23:28 ` Woodruff, Richard
2009-02-18 0:34 ` mark gross
2009-02-18 17:30 ` Chris Ball
2009-02-16 23:26 ` Rafael J. Wysocki
2009-02-22 13:46 ` Pavel Machek
2009-02-18 0:27 ` mark gross
2009-02-18 21:11 ` Rafael J. Wysocki
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