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authorRafael J. Wysocki <rjw@sisk.pl>2012-01-29 20:38:29 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2012-01-29 20:38:29 +0100
commitcf579dfb82550e34de7ccf3ef090d8b834ccd3a9 (patch)
tree764ed72670c18c86d3eb9650025c56d661a31315 /include/linux/suspend.h
parent181e9bdef37bfcaa41f3ab6c948a2a0d60a268b5 (diff)
downloadop-kernel-dev-cf579dfb82550e34de7ccf3ef090d8b834ccd3a9.zip
op-kernel-dev-cf579dfb82550e34de7ccf3ef090d8b834ccd3a9.tar.gz
PM / Sleep: Introduce "late suspend" and "early resume" of devices
The current device suspend/resume phases during system-wide power transitions appear to be insufficient for some platforms that want to use the same callback routines for saving device states and related operations during runtime suspend/resume as well as during system suspend/resume. In principle, they could point their .suspend_noirq() and .resume_noirq() to the same callback routines as their .runtime_suspend() and .runtime_resume(), respectively, but at least some of them require device interrupts to be enabled while the code in those routines is running. It also makes sense to have device suspend-resume callbacks that will be executed with runtime PM disabled and with device interrupts enabled in case someone needs to run some special code in that context during system-wide power transitions. Apart from this, .suspend_noirq() and .resume_noirq() were introduced as a workaround for drivers using shared interrupts and failing to prevent their interrupt handlers from accessing suspended hardware. It appears to be better not to use them for other porposes, or we may have to deal with some serious confusion (which seems to be happening already). For the above reasons, introduce new device suspend/resume phases, "late suspend" and "early resume" (and analogously for hibernation) whose callback will be executed with runtime PM disabled and with device interrupts enabled and whose callback pointers generally may point to runtime suspend/resume routines. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Reviewed-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'include/linux/suspend.h')
-rw-r--r--include/linux/suspend.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 91784a4..ac1c114 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -42,8 +42,10 @@ enum suspend_stat_step {
SUSPEND_FREEZE = 1,
SUSPEND_PREPARE,
SUSPEND_SUSPEND,
+ SUSPEND_SUSPEND_LATE,
SUSPEND_SUSPEND_NOIRQ,
SUSPEND_RESUME_NOIRQ,
+ SUSPEND_RESUME_EARLY,
SUSPEND_RESUME
};
@@ -53,8 +55,10 @@ struct suspend_stats {
int failed_freeze;
int failed_prepare;
int failed_suspend;
+ int failed_suspend_late;
int failed_suspend_noirq;
int failed_resume;
+ int failed_resume_early;
int failed_resume_noirq;
#define REC_FAILED_NUM 2
int last_failed_dev;
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