From: David Brownell <david-b@pacbell.net>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Shaohua Li <shaohua.li@intel.com>,
linux acpi <linux-acpi@vger.kernel.org>,
Len Brown <lenb@kernel.org>, Pavel Machek <pavel@ucw.cz>,
pm list <linux-pm@lists.linux-foundation.org>
Subject: Re: [RFD] How to tell ACPI drivers what the target sleep state is (was: Re: [PATCH 1/2] acpi choose sleep state help)
Date: Thu, 21 Jun 2007 07:48:47 -0700 [thread overview]
Message-ID: <200706210748.48781.david-b@pacbell.net> (raw)
In-Reply-To: <200706211442.41140.rjw@sisk.pl>
On Thursday 21 June 2007, Rafael J. Wysocki wrote:
> The issue at hand is that some device drivers may need to know what the
> target sleep state of the system will be when their .suspend() routines are
> being executed. Currently, there's no means of passing that information to the
> drivers and my question is how to do this.
Actually what they need to know is some *attribute* of that state.
They really don't care what the state is. The $SUBJECT patch isn't
driver code ... it's for platform hooks that expose attributes to
the drivers. Specifically, it's ACPI code, talking to drivers that
must run on non-ACPI systems. Any driver that thinks it needs to
understand anything about ACPI states is sadly broken.
Remember also that the Linux "states" (in /sys/power/state) are an
inadequate representation of what most hardware can do. Common
hardware can support a lot more low power sleep modes than the two
states Linux currently defines ... a limitation inherited from
first APM, and them more recently ACPI, which doesn't fit embedded
systems well at all.
- Dave
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next prev parent reply other threads:[~2007-06-21 15:37 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-19 2:33 [PATCH 1/2] acpi choose sleep state help Shaohua Li
2007-06-19 11:52 ` Rafael J. Wysocki
2007-06-19 22:00 ` Rafael J. Wysocki
2007-06-20 6:18 ` Shaohua Li
2007-06-20 11:32 ` [RFD] How to tell ACPI drivers what the target sleep state is (was: Re: [PATCH 1/2] acpi choose sleep state help) Rafael J. Wysocki
2007-06-20 11:32 ` Rafael J. Wysocki
2007-06-20 14:08 ` Alan Stern
2007-06-20 14:08 ` [linux-pm] " Alan Stern
2007-06-20 14:36 ` Rafael J. Wysocki
2007-06-20 14:36 ` [linux-pm] " Rafael J. Wysocki
2007-06-21 6:57 ` David Brownell
2007-06-21 1:51 ` Len Brown
2007-06-21 1:51 ` Len Brown
2007-06-21 7:10 ` David Brownell
2007-06-21 7:04 ` David Brownell
2007-06-21 12:42 ` Rafael J. Wysocki
2007-06-21 12:42 ` Rafael J. Wysocki
2007-06-21 13:03 ` Pavel Machek
2007-06-21 13:03 ` Pavel Machek
2007-06-21 14:46 ` Rafael J. Wysocki
2007-06-21 14:46 ` Rafael J. Wysocki
2007-06-21 15:23 ` [linux-pm] " Alan Stern
2007-06-21 19:41 ` Rafael J. Wysocki
2007-06-21 19:41 ` Rafael J. Wysocki
2007-06-21 15:23 ` Alan Stern
2007-06-21 16:35 ` David Brownell
2007-06-21 19:42 ` Rafael J. Wysocki
2007-06-21 19:42 ` Rafael J. Wysocki
2007-06-21 16:35 ` David Brownell
2007-06-21 15:37 ` David Brownell
2007-06-21 18:59 ` [linux-pm] " Pavel Machek
2007-06-21 20:03 ` David Brownell
2007-06-21 20:03 ` [linux-pm] " David Brownell
2007-06-21 20:37 ` Rafael J. Wysocki
2007-06-21 20:37 ` [linux-pm] " Rafael J. Wysocki
2007-06-21 18:59 ` Pavel Machek
2007-06-21 19:52 ` Rafael J. Wysocki
2007-06-21 19:52 ` Rafael J. Wysocki
2007-06-21 15:37 ` David Brownell
2007-06-21 14:48 ` David Brownell [this message]
2007-06-21 20:04 ` Rafael J. Wysocki
2007-06-21 20:04 ` Rafael J. Wysocki
2007-06-21 20:22 ` David Brownell
2007-06-21 20:41 ` Rafael J. Wysocki
2007-06-21 20:41 ` Rafael J. Wysocki
2007-06-21 20:22 ` David Brownell
2007-06-21 14:48 ` David Brownell
2007-06-21 15:56 ` Alan Stern
2007-06-21 16:35 ` David Brownell
2007-06-21 16:35 ` [linux-pm] " David Brownell
2007-06-21 17:11 ` Alan Stern
2007-06-21 18:02 ` David Brownell
2007-06-21 18:02 ` [linux-pm] " David Brownell
2007-06-21 18:51 ` Alan Stern
2007-06-21 19:51 ` David Brownell
2007-06-21 19:51 ` [linux-pm] " David Brownell
2007-06-21 20:35 ` Rafael J. Wysocki
2007-06-21 20:35 ` [linux-pm] " Rafael J. Wysocki
2007-06-21 20:46 ` David Brownell
2007-06-21 21:02 ` Rafael J. Wysocki
2007-06-21 21:02 ` [linux-pm] " Rafael J. Wysocki
2007-06-21 21:04 ` Alan Stern
2007-06-21 21:04 ` [linux-pm] " Alan Stern
2007-06-23 22:00 ` [RFC][PATCH -mm] PM: Introduce set_target method in pm_ops Rafael J. Wysocki
2007-06-23 23:46 ` Alan Stern
2007-06-23 23:46 ` Alan Stern
2007-06-24 0:03 ` Rafael J. Wysocki
2007-06-24 0:03 ` Rafael J. Wysocki
2007-06-24 0:28 ` Alan Stern
2007-06-24 0:28 ` Alan Stern
2007-06-24 9:52 ` [linux-pm] " Johannes Berg
2007-06-24 9:52 ` Johannes Berg
2007-06-24 11:49 ` Igor Stoppa
2007-06-24 11:49 ` [linux-pm] " Igor Stoppa
2007-06-24 13:04 ` Rafael J. Wysocki
2007-06-24 13:04 ` Rafael J. Wysocki
2007-06-24 12:57 ` Rafael J. Wysocki
2007-06-24 12:57 ` Rafael J. Wysocki
2007-06-25 0:01 ` David Brownell
2007-06-25 22:14 ` Rafael J. Wysocki
2007-06-25 22:14 ` Rafael J. Wysocki
2007-06-25 0:01 ` David Brownell
2007-06-25 13:04 ` Pavel Machek
2007-06-25 13:04 ` Pavel Machek
2007-06-25 13:57 ` [linux-pm] " Dmitry Krivoschekov
2007-06-25 19:28 ` Pavel Machek
2007-06-25 19:28 ` [linux-pm] " Pavel Machek
2007-06-25 22:16 ` Rafael J. Wysocki
2007-06-25 22:16 ` [linux-pm] " Rafael J. Wysocki
2007-06-25 13:57 ` Dmitry Krivoschekov
2007-06-23 22:00 ` Rafael J. Wysocki
2007-06-21 20:46 ` Re: [RFD] How to tell ACPI drivers what the target sleep state is (was: Re: [PATCH 1/2] acpi choose sleep state help) David Brownell
2007-06-21 21:00 ` Platform-specific system power states Alan Stern
2007-06-22 19:49 ` David Brownell
2007-06-22 21:30 ` Rafael J. Wysocki
2007-06-23 1:32 ` Alan Stern
2007-06-23 20:20 ` Rafael J. Wysocki
2007-06-25 0:10 ` David Brownell
2007-06-25 22:59 ` Rafael J. Wysocki
2007-06-25 0:26 ` David Brownell
2007-06-25 23:04 ` Rafael J. Wysocki
2007-06-21 20:19 ` [linux-pm] Re: [RFD] How to tell ACPI drivers what the target sleep state is (was: Re: [PATCH 1/2] acpi choose sleep state help) Rafael J. Wysocki
2007-06-21 20:32 ` David Brownell
2007-06-21 20:32 ` [linux-pm] " David Brownell
2007-06-21 20:50 ` Rafael J. Wysocki
2007-06-21 20:50 ` [linux-pm] " Rafael J. Wysocki
2007-06-21 20:19 ` Rafael J. Wysocki
2007-06-21 18:51 ` Alan Stern
2007-06-21 17:11 ` Alan Stern
2007-06-20 11:32 ` Rafael J. Wysocki
2007-06-21 7:14 ` [PATCH 1/2] acpi choose sleep state help David Brownell
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