diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpica/aclocal.h | 10 | ||||
| -rw-r--r-- | drivers/acpi/acpica/hwregs.c | 15 |
2 files changed, 24 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h index 18a8d96eaa49..f01e155b2bcc 100644 --- a/drivers/acpi/acpica/aclocal.h +++ b/drivers/acpi/acpica/aclocal.h @@ -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 diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c index fd7abe277db3..611736266f9f 100644 --- a/drivers/acpi/acpica/hwregs.c +++ b/drivers/acpi/acpica/hwregs.c @@ -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; |