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ACPICA: Preserve all PM control reserved and ignored bits 

As per the ACPI specification, preserve (read/modify/write) all
bits that are defined as either reserved or ignored (PM control
control registers only.)

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2009-03-13 09:10:46 +08:00 committed by Len Brown
parent 8636f8d257
commit 20869dcfde
2 changed files with 24 additions and 1 deletions
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10
drivers/acpi/acpica/aclocal.h
View File

@ -780,7 +780,15 @@ struct acpi_bit_register_info {
* must be preserved.
*/
#define ACPI_PM1_STATUS_PRESERVED_BITS 0x0800 /* Bit 11 */
#define ACPI_PM1_CONTROL_PRESERVED_BITS 0x0200 /* Bit 9 (whatever) */
/* For control registers, both ignored and reserved bits must be preserved */
#define ACPI_PM1_CONTROL_IGNORED_BITS 0x0201 /* Bits 9, 0(SCI_EN) */
#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)
#define ACPI_PM2_CONTROL_PRESERVED_BITS 0xFFFFFFFE /* All except bit 0 */
/*
* Register IDs

15
drivers/acpi/acpica/hwregs.c
View File

@ -328,6 +328,21 @@ acpi_status acpi_hw_register_write(u32 register_id, u32 value)
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
/*
* For control registers, all reserved bits must be preserved,
* as per the ACPI spec.
*/
status =
acpi_read(&read_value, &acpi_gbl_FADT.xpm2_control_block);
if (ACPI_FAILURE(status)) {
goto exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS,
read_value);
status = acpi_write(value, &acpi_gbl_FADT.xpm2_control_block);
break;