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Disable preservation of SCI enable bit (SCI_EN).

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Preserving this bit breaks some machines. Not preserving this bit seems
to work OK in all cases, even though this goes against the ACPI spec.
This commit is contained in:
Robert Moore 2009-05-20 13:52:25 -07:00
parent 07e1415b52
commit 64b824d3c7
1 changed files with 8 additions and 1 deletions
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9
source/include/aclocal.h
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@ -1010,7 +1010,14 @@ typedef 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) */
/*
* For PM1 control, the SCI enable bit (bit 0, SCI_EN) is defined by the
* ACPI specification to be a "preserved" bit - "OSPM always preserves this
* bit position", section 4.7.3.2.1. However, some machines fail if this
* bit is in fact preserved. No machines fail if the bit is not preserved.
* Therefore, we no longer attempt to preserve this bit. (May 2009)
*/
#define ACPI_PM1_CONTROL_IGNORED_BITS 0x0200 /* Bit 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)