From 1312b7e0caca44e7ff312bc2eaa888943384e3e1 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Thu, 10 Aug 2017 00:31:58 +0200
Subject: [PATCH] ACPICA: Make it possible to enable runtime GPEs earlier
Git-commit: 1312b7e0caca44e7ff312bc2eaa888943384e3e1
Patch-mainline: v4.14-rc1
References: FATE#323948
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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/acpi/acpica/evgpeblk.c | 2 ++
drivers/acpi/acpica/evxfgpe.c | 8 ++++++++
include/acpi/actypes.h | 1 +
3 files changed, 11 insertions(+)
--- a/drivers/acpi/acpica/evgpeblk.c
+++ b/drivers/acpi/acpica/evgpeblk.c
@@ -496,6 +496,8 @@ acpi_ev_initialize_gpe_block(struct acpi
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));
--- a/drivers/acpi/acpica/evxfgpe.c
+++ b/drivers/acpi/acpica/evxfgpe.c
@@ -435,6 +435,14 @@ acpi_setup_gpe_for_wake(acpi_handle wake
*/
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;
}
/*
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -786,6 +786,7 @@ 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