ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume
authorColin Ian King <colin.king@canonical.com>
Mon, 2 Aug 2010 15:14:43 +0000 (15:14 +0000)
committerLen Brown <len.brown@intel.com>
Tue, 28 Sep 2010 19:40:46 +0000 (15:40 -0400)
commit573b638158029898caf9470c8214b7ddd29751e3
tree284335b42bb0ba88a1026466080f3f62aa917afc
parent32163f4b2cef28a5aab8b226ffecfc6379a53786
ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

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@canonical.com>
Signed-off-by: Len Brown <len.brown@intel.com>
drivers/acpi/acpica/aclocal.h