Commit 729b2bdb authored by Zhao Yakui's avatar Zhao Yakui Committed by Len Brown
Browse files

ACPI : Disable the device's ability to wake the sleeping system in the boot phase 

In some machines some GPE is shared by several ACPI devices, for example:
sleep button, keyboard, mouse. At the same time one of them is
non-wake(runtime) device and the other are wake devices. In such case OSPM
should call the _PSW object to disable the device's ability to
wake the sleeping system in the boot phase.
Otherwise there will be ACPI interrupt flood triggered by the GPE input.

The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
So it is necessary to call _DSW object first. Only when it is not
present will the _PSW object used.

http://bugzilla.kernel.org/show_bug.cgi?id=10224



Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 7180c4c9

drivers/acpi/scan.c

+42 −1
Original line number Diff line number Diff line
@@ -692,6 +692,9 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 
	acpi_status status = 0;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	union acpi_object *package = NULL;

	union acpi_object in_arg[3];

	struct acpi_object_list arg_list = { 3, in_arg };

	acpi_status psw_status = AE_OK;



	struct acpi_device_id button_device_ids[] = {

		{"PNP0C0D", 0},
@@ -700,7 +703,6 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 
		{"", 0},

	};





	/* _PRW */

	status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);

	if (ACPI_FAILURE(status)) {
@@ -718,6 +720,45 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 
	kfree(buffer.pointer);



	device->wakeup.flags.valid = 1;

	/* Call _PSW/_DSW object to disable its ability to wake the sleeping

	 * system for the ACPI device with the _PRW object.

	 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.

	 * So it is necessary to call _DSW object first. Only when it is not

	 * present will the _PSW object used.

	 */

	/*

	 * Three agruments are needed for the _DSW object.

	 * Argument 0: enable/disable the wake capabilities

	 * When _DSW object is called to disable the wake capabilities, maybe

	 * the first argument is filled. The value of the other two agruments

	 * is meaningless.

	 */

	in_arg[0].type = ACPI_TYPE_INTEGER;

	in_arg[0].integer.value = 0;

	in_arg[1].type = ACPI_TYPE_INTEGER;

	in_arg[1].integer.value = 0;

	in_arg[2].type = ACPI_TYPE_INTEGER;

	in_arg[2].integer.value = 0;

	psw_status = acpi_evaluate_object(device->handle, "_DSW",

						&arg_list, NULL);

	if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in evaluate _DSW\n"));

	/*

	 * When the _DSW object is not present, OSPM will call _PSW object.

	 */

	if (psw_status == AE_NOT_FOUND) {

		/*

		 * Only one agruments is required for the _PSW object.

		 * agrument 0: enable/disable the wake capabilities

		 */

		arg_list.count = 1;

		in_arg[0].integer.value = 0;

		psw_status = acpi_evaluate_object(device->handle, "_PSW",

						&arg_list, NULL);

		if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))

			ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in "

						"evaluate _PSW\n"));

	}

	/* Power button, Lid switch always enable wakeup */

	if (!acpi_match_device_ids(device, button_device_ids))

		device->wakeup.flags.run_wake = 1;

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