This is a note to let you know that I've just added the patch titled

ACPICA: Make it possible to enable runtime GPEs earlier

to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: acpica-make-it-possible-to-enable-runtime-gpes-earlier.patch and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

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: ACPICA: Make it possible to enable runtime GPEs earlier

From: Rafael J. Wysocki rafael.j.wysocki@intel.com

commit 1312b7e0caca44e7ff312bc2eaa888943384e3e1 upstream.

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: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/acpi/acpica/evgpeblk.c | 2 ++ drivers/acpi/acpica/evxfgpe.c | 8 ++++++++ include/acpi/actypes.h | 3 ++- 3 files changed, 12 insertions(+), 1 deletion(-)

--- 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 @@ -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

Patches currently in stable-queue which might be from rafael.j.wysocki@intel.com are

queue-4.13/acpi-pm-blacklist-low-power-s0-idle-_dsm-for-dell-xps13-9360.patch queue-4.13/acpica-make-it-possible-to-enable-runtime-gpes-earlier.patch queue-4.13/acpica-dispatch-active-gpes-at-init-time.patch queue-4.13/acpi-scan-enable-gpes-before-scanning-the-namespace.patch