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acpi: clear power button status bit after waking up...

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so that it is not confused for a new power off request.

Learned from:	Linux and ACPI specification
Tested by:	gjb
MFC after:	12 days
This commit is contained in:
Andriy Gapon 2013-02-02 12:44:19 +00:00
parent b1a5c01749
commit b913a7d5d7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246251
1 changed files with 25 additions and 0 deletions
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25
sys/dev/acpica/acpi.c
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@ -2659,6 +2659,7 @@ acpi_EnterSleepState(struct acpi_softc *sc, int state)
{
register_t intr;
ACPI_STATUS status;
ACPI_EVENT_STATUS power_button_status;
enum acpi_sleep_state slp_state;
int sleep_result;
@ -2758,6 +2759,30 @@ acpi_EnterSleepState(struct acpi_softc *sc, int state)
AcpiWriteBitRegister(ACPI_BITREG_SCI_ENABLE, ACPI_ENABLE_EVENT);
AcpiLeaveSleepStatePrep(state);
if (sleep_result == 1 && state == ACPI_STATE_S3) {
/*
* Prevent mis-interpretation of the wakeup by power button
* as a request for power off.
* Ideally we should post an appropriate wakeup event,
* perhaps using acpi_event_power_button_wake or alike.
*
* Clearing of power button status after wakeup is mandated
* by ACPI specification in section "Fixed Power Button".
*
* XXX As of ACPICA 20121114 AcpiGetEventStatus provides
* status as 0/1 corressponding to inactive/active despite
* its type being ACPI_EVENT_STATUS. In other words,
* we should not test for ACPI_EVENT_FLAG_SET for time being.
*/
if (ACPI_SUCCESS(AcpiGetEventStatus(ACPI_EVENT_POWER_BUTTON,
&power_button_status)) && power_button_status != 0) {
AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
device_printf(sc->acpi_dev,
"cleared fixed power button status\n");
}
}
intr_restore(intr);
/* call acpi_wakeup_machdep() again with interrupt enabled */