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ACPICA: Make it possible to enable runtime GPEs earlier

Browse source 
Runtime GPEs have corresponding _Lxx/_Exx methods and are enabled
automatically during the initialization of the ACPI subsystem through
acpi_update_all_gpes() with the assumption that acpi_setup_gpe_for_wake()
will be called in advance for all of the GPEs pointed to by _PRW
objects in the namespace that may be affected by acpi_update_all_gpes().
That is, acpi_ev_initialize_gpe_block() can only be called for a GPE
block after acpi_setup_gpe_for_wake() has been called for all of the
_PRW (wakeup) GPEs in it.

The platform firmware on some systems, however, expects GPEs to be
enabled before the enumeration of devices which is when
acpi_setup_gpe_for_wake() is called and that goes against the above
assumption.

For this reason, introduce a new flag to be set by
acpi_ev_initialize_gpe_block() when automatically enabling a GPE
to indicate to acpi_setup_gpe_for_wake() that it needs to drop the
reference to the GPE coming from acpi_ev_initialize_gpe_block()
and modify acpi_setup_gpe_for_wake() accordingly.  These changes
allow acpi_setup_gpe_for_wake() and acpi_ev_initialize_gpe_block()
to be invoked in any order.

Signed-off-by: Rafael J. Wysocki <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2017-08-10 00:31:58 +02:00
commit 1312b7e0ca
3 changed files with 12 additions and 1 deletions
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2
drivers/acpi/acpica/evgpeblk.c
View file

@ -496,6 +496,8 @@ acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
continue;
}
gpe_event_info->flags |= ACPI_GPE_AUTO_ENABLED;
if (event_status & ACPI_EVENT_FLAG_STATUS_SET) {
ACPI_INFO(("GPE 0x%02X active on init",
gpe_number));

8
drivers/acpi/acpica/evxfgpe.c
View file

@ -435,6 +435,14 @@ acpi_setup_gpe_for_wake(acpi_handle wake_device,
*/
gpe_event_info->flags =
(ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
} else if (gpe_event_info->flags & ACPI_GPE_AUTO_ENABLED) {
/*
* A reference to this GPE has been added during the GPE block
* initialization, so drop it now to prevent the GPE from being
* permanently enabled and clear its ACPI_GPE_AUTO_ENABLED flag.
*/
(void)acpi_ev_remove_gpe_reference(gpe_event_info);
gpe_event_info->flags &= ~ACPI_GPE_AUTO_ENABLED;
}
/*