ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

Submitted by Colin King on Oct. 6, 2010, 12:22 p.m.


Message ID
State Accepted
Delegated to: Leann Ogasawara
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Commit Message

Colin King Oct. 6, 2010, 12:22 p.m.
From: Colin Ian King <>

Section (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.


Signed-off-by: Colin Ian King <>
Signed-off-by: Len Brown <>
 drivers/acpi/acpica/aclocal.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

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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 {
 #define ACPI_BITMASK_TIMER_ENABLE               0x0001