From: Colin Ian King <colin.king@canonical.com>
Date: Mon, 2 Aug 2010 15:14:43 +0000 (+0000)
Subject: ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume
X-Git-Tag: v2.6.36-rc7~25^2^7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=573b638158029898caf9470c8214b7ddd29751e3;p=pandora-kernel.git

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>
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