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ACPICA: Make it possible to enable runtime GPEs earlier 

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 <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
zero-colors
Rafael J. Wysocki 2017-08-10 00:31:58 +02:00
parent ecc1165b8b
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;
}
/*

3
include/acpi/actypes.h
View File

@ -775,7 +775,7 @@ typedef u32 acpi_event_status;
* | | | | +-- Type of dispatch:to method, handler, notify, or none
* | | | +----- Interrupt type: edge or level triggered
* | | +------- Is a Wake GPE
* | +--------- Is GPE masked by the software GPE masking mechanism
* | +--------- Has been enabled automatically at init time
* +------------ <Reserved>
*/
#define ACPI_GPE_DISPATCH_NONE (u8) 0x00
@ -791,6 +791,7 @@ typedef u32 acpi_event_status;
#define ACPI_GPE_XRUPT_TYPE_MASK (u8) 0x08
#define ACPI_GPE_CAN_WAKE (u8) 0x10
#define ACPI_GPE_AUTO_ENABLED (u8) 0x20
/*
* Flags for GPE and Lock interfaces