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authorRafael J. Wysocki <rjw@sisk.pl>2009-04-19 20:08:42 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2009-04-19 20:08:42 +0200
commit6a7c7eaf71b636f197d73b381a2ab729ebdcfb2e (patch)
tree73c642bff623c2f1a87f6c353b21e3484bd9e899 /kernel/power
parentff54250a0ebab7f90a5f848a0ba63f999830c872 (diff)
PM/Suspend: Introduce two new platform callbacks to avoid breakage
Commit 900af0d973856d6feb6fc088c2d0d3fde57707d3 (PM: Change suspend code ordering) changed the ordering of suspend code in such a way that the platform .prepare() callback is now executed after the device drivers' late suspend callbacks have run. Unfortunately, this turns out to break ARM platforms that need to talk via I2C to power control devices during the .prepare() callback. For this reason introduce two new platform suspend callbacks, .prepare_late() and .wake(), that will be called just prior to disabling non-boot CPUs and right after bringing them back on line, respectively, and use them instead of .prepare() and .finish() for ACPI suspend. Make the PM core execute the .prepare() and .finish() platform suspend callbacks where they were executed previously (that is, right after calling the regular suspend methods provided by device drivers and right before executing their regular resume methods, respectively). It is not necessary to make analogous changes to the hibernation code and data structures at the moment, because they are only used by ACPI platforms. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/main.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index f172f41858b..f99ed6a75ea 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -291,20 +291,26 @@ static int suspend_enter(suspend_state_t state)
device_pm_lock();
+ if (suspend_ops->prepare) {
+ error = suspend_ops->prepare();
+ if (error)
+ goto Done;
+ }
+
error = device_power_down(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down\n");
- goto Done;
+ goto Platfrom_finish;
}
- if (suspend_ops->prepare) {
- error = suspend_ops->prepare();
+ if (suspend_ops->prepare_late) {
+ error = suspend_ops->prepare_late();
if (error)
goto Power_up_devices;
}
if (suspend_test(TEST_PLATFORM))
- goto Platfrom_finish;
+ goto Platform_wake;
error = disable_nonboot_cpus();
if (error || suspend_test(TEST_CPUS))
@@ -326,13 +332,17 @@ static int suspend_enter(suspend_state_t state)
Enable_cpus:
enable_nonboot_cpus();
- Platfrom_finish:
- if (suspend_ops->finish)
- suspend_ops->finish();
+ Platform_wake:
+ if (suspend_ops->wake)
+ suspend_ops->wake();
Power_up_devices:
device_power_up(PMSG_RESUME);
+ Platfrom_finish:
+ if (suspend_ops->finish)
+ suspend_ops->finish();
+
Done:
device_pm_unlock();