lkml.org 
[lkml]   [2012]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/7] PM / Domains: Rework system suspend callback routines
On Mon 2011-11-07 01:08:11, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@sisk.pl>
>
> The current generic PM domains code attempts to use the generic
> system suspend operations along with the domains' device stop/start
> routines, which requires device drivers to assume that their
> system suspend/resume (and hibernation/restore) callbacks will always
> be used with generic PM domains. However, in theory, the same
> hardware may be used in devices that don't belong to any PM domain,
> in which case it would be necessary to add "fake" PM domains to
> satisfy the above assumption. Also, the domain the hardware belongs
> to may not be handled with the help of the generic code.
>
> To allow device drivers that may be used along with the generic PM
> domains code of more flexibility, add new device callbacks, .freeze(),
> .freeze_late(), .thaw_early() and .thaw(), that can be supplied by
> the drivers in addition to their "standard" system suspend and
> hibernation callbacks. These new callbacks, if defined, will be used
> by the generic PM domains code for the handling of system suspend and
> hibernation instead of the "standard" ones. This will allow drivers
> to be designed to work with generic PM domains as well as without
> them.

Should this go to Documentation/ somewhere? May concern is that we
have way too many callbacks these days. Why is fake PM domain such a
bad thing?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


\
 
 \ /
  Last update: 2012-02-17 20:31    [W:0.518 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site