1 files changed, 38 insertions, 14 deletions

diff --git a/drivers/acpi/utilities/utxface.c b/drivers/acpi/utilities/utxface.c
index f06bd5e5e9d1..57adc5bc02f3 100644
--- a/drivers/acpi/utilities/utxface.c
+++ b/drivers/acpi/utilities/utxface.c
@@ -178,10 +178,14 @@ acpi_status acpi_enable_subsystem(u32 flags)
         /*
          * Initialize ACPI Event handling (Fixed and General Purpose)
          *
-         * NOTE: We must have the hardware AND events initialized before we can
-         * execute ANY control methods SAFELY.  Any control method can require
-         * ACPI hardware support, so the hardware MUST be initialized before
-         * execution!
+         * Note1: We must have the hardware and events initialized before we can
+         * execute any control methods safely. Any control method can require
+         * ACPI hardware support, so the hardware must be fully initialized before
+         * any method execution!
+         *
+         * Note2: Fixed events are initialized and enabled here. GPEs are
+         * initialized, but cannot be enabled until after the hardware is
+         * completely initialized (SCI and global_lock activated)
          */
         if (!(flags & ACPI_NO_EVENT_INIT)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
@@ -193,8 +197,10 @@ acpi_status acpi_enable_subsystem(u32 flags)
                 }
         }
 
-        /* Install the SCI handler and Global Lock handler */
-
+        /*
+         * Install the SCI handler and Global Lock handler. This completes the
+         * hardware initialization.
+         */
         if (!(flags & ACPI_NO_HANDLER_INIT)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                   "[Init] Installing SCI/GL handlers\n"));
@@ -205,6 +211,24 @@ acpi_status acpi_enable_subsystem(u32 flags)
                 }
         }
 
+        /*
+         * Complete the GPE initialization for the GPE blocks defined in the FADT
+         * (GPE block 0 and 1).
+         *
+         * Note1: This is where the _PRW methods are executed for the GPEs. These
+         * methods can only be executed after the SCI and Global Lock handlers are
+         * installed and initialized.
+         *
+         * Note2: Currently, there seems to be no need to run the _REG methods
+         * before execution of the _PRW methods and enabling of the GPEs.
+         */
+        if (!(flags & ACPI_NO_EVENT_INIT)) {
+                status = acpi_ev_install_fadt_gpes();
+                if (ACPI_FAILURE(status)) {
+                        return (status);
+                }
+        }
+
         return_ACPI_STATUS(status);
 }
 
@@ -230,9 +254,9 @@ acpi_status acpi_initialize_objects(u32 flags)
         /*
          * Run all _REG methods
          *
-         * NOTE: Any objects accessed
-         * by the _REG methods will be automatically initialized, even if they
-         * contain executable AML (see call to acpi_ns_initialize_objects below).
+         * Note: Any objects accessed by the _REG methods will be automatically
+         * initialized, even if they contain executable AML (see the call to
+         * acpi_ns_initialize_objects below).
          */
         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
@@ -245,9 +269,9 @@ acpi_status acpi_initialize_objects(u32 flags)
         }
 
         /*
-         * Initialize the objects that remain uninitialized.  This
-         * runs the executable AML that may be part of the declaration of these
-         * objects: operation_regions, buffer_fields, Buffers, and Packages.
+         * Initialize the objects that remain uninitialized. This runs the
+         * executable AML that may be part of the declaration of these objects:
+         * operation_regions, buffer_fields, Buffers, and Packages.
          */
         if (!(flags & ACPI_NO_OBJECT_INIT)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
@@ -260,8 +284,8 @@ acpi_status acpi_initialize_objects(u32 flags)
         }
 
         /*
-         * Initialize all device objects in the namespace
-         * This runs the _STA and _INI methods.
+         * Initialize all device objects in the namespace. This runs the device
+         * _STA and _INI methods.
          */
         if (!(flags & ACPI_NO_DEVICE_INIT)) {
                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,