ACPI: resume: re-enable SCI-enable workaround
authorLin Ming <ming.m.lin@intel.com>
Sat, 16 May 2009 02:27:49 +0000 (22:27 -0400)
committerLen Brown <len.brown@intel.com>
Sat, 16 May 2009 02:27:49 +0000 (22:27 -0400)
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@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
drivers/acpi/acpica/aclocal.h

index 772ee5c4ccca51669d09ed576630c6b5e5cc0fce..2ec394a328e95fea0f15d2e94aef9c32fda507dd 100644 (file)
@@ -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)