linux-kernel - [PATCH] ACPI: resume: re-enable SCI-enable workaround

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Date:	Fri, 15 May 2009 22:34:15 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Bob Copeland <me@...copeland.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Lin Ming <ming.m.lin@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	yakui_zhao <yakui.zhao@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Moore, Robert" <robert.moore@...el.com>
Subject: [PATCH] ACPI: resume: re-enable SCI-enable workaround

From: Lin Ming <ming.m.lin@...el.com>

The BIOS bug workaround mistakenly got disabled
when we followed the ACPI specification more closely
by ignoring OS updates to that bit.

(The BIOS is supposed to update SCI_EN, not the OS)

http://bugzilla.kernel.org/show_bug.cgi?id=13289

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---

as-applied.
thanks,
-Len

 drivers/acpi/acpica/aclocal.h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 772ee5c..2ec394a 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -787,7 +787,12 @@ struct acpi_bit_register_info {
 
 /* For control registers, both ignored and reserved bits must be preserved */
 
-#define ACPI_PM1_CONTROL_IGNORED_BITS           0x0201	/* Bits 9, 0(SCI_EN) */
+/*
+ * The ACPI spec says to ignore PM1_CTL.SCI_EN (bit 0)
+ * but we need to be able to write ACPI_BITREG_SCI_ENABLE directly
+ * as a BIOS workaround on some machines.
+ */
+#define ACPI_PM1_CONTROL_IGNORED_BITS           0x0200	/* Bits 9 */
 #define ACPI_PM1_CONTROL_RESERVED_BITS          0xC1F8	/* Bits 14-15, 3-8 */
 #define ACPI_PM1_CONTROL_PRESERVED_BITS \
 	       (ACPI_PM1_CONTROL_IGNORED_BITS | ACPI_PM1_CONTROL_RESERVED_BITS)
-- 
1.6.3.1.9.g95405b


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