linux-kernel - [089/103] ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE

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Date:	Fri, 22 Oct 2010 11:52:03 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Colin Ian King <colin.king@...onical.com>,
	Len Brown <len.brown@...el.com>
Subject: [089/103] ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit 573b638158029898caf9470c8214b7ddd29751e3 upstream.

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@...onical.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/acpi/acpica/aclocal.h |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -853,6 +853,7 @@ 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


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