[PATCH] ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

Section 4.7.3.1.1 (PM1 Status Registers) of version 4.0 of
the ACPI spec concerning PCIEXP_WAKE_STS points out in
in the final note field in table 4-11 that if this bit is
set to 1 and the system is put into a sleeping state then
the system will not automatically wake.

This bit gets set by hardware to indicate that the system
woke up due to a PCI Express wakeup event, so clear it during
acpi_hw_clear_acpi_status() calls to enable subsequent
resumes to work.

BugLink: http://bugs.launchpad.net/bugs/613381

Signed-off-by: Colin Ian King <colin.king at canonical.com>
Signed-off-by: Len Brown <len.brown at intel.com>
---
 drivers/acpi/acpica/aclocal.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index df85b53..7dad916 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -854,6 +854,7 @@ struct acpi_bit_register_info {
 	ACPI_BITMASK_POWER_BUTTON_STATUS   | \
 	ACPI_BITMASK_SLEEP_BUTTON_STATUS   | \
 	ACPI_BITMASK_RT_CLOCK_STATUS       | \
+	ACPI_BITMASK_PCIEXP_WAKE_DISABLE   | \
 	ACPI_BITMASK_WAKE_STATUS)
 
 #define ACPI_BITMASK_TIMER_ENABLE               0x0001
-- 
1.7.1