Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ACPICA: Hardcode access width for the reset register.

Browse source 
The ACPI spec requires the reset register width to be 8, so we
now hardcode it and ignore the FADT value. This provides/maintains
compatibility with other ACPI implementations that have allowed
BIOS code with bad register width values to go unnoticed.
Matthew Garett, Bob Moore, Lv Zheng.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bob Moore 2013-10-29 09:29:45 +08:00 committed by Rafael J. Wysocki
parent ab3b24807a
commit e07fcfd89f
2 changed files with 9 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/acpi/acpica/hwxface.c
View file

@ -83,11 +83,17 @@ acpi_status acpi_reset(void)
* For I/O space, write directly to the OSL. This bypasses the port
* validation mechanism, which may block a valid write to the reset
* register.
* Spec section 4.7.3.6 requires register width to be 8.
*
* NOTE:
* The ACPI spec requires the reset register width to be 8, so we
* hardcode it here and ignore the FADT value. This maintains
* compatibility with other ACPI implementations that have allowed
* BIOS code with bad register width values to go unnoticed.
*/
status =
acpi_os_write_port((acpi_io_address) reset_reg->address,
acpi_gbl_FADT.reset_value, 8);
acpi_gbl_FADT.reset_value,
ACPI_RESET_REGISTER_WIDTH);
} else {
/* Write the reset value to the reset register */

1
include/acpi/actypes.h
View file

@ -349,6 +349,7 @@ typedef u32 acpi_physical_address;
#define ACPI_PM1_REGISTER_WIDTH 16
#define ACPI_PM2_REGISTER_WIDTH 8
#define ACPI_PM_TIMER_WIDTH 32
#define ACPI_RESET_REGISTER_WIDTH 8
/* Names within the namespace are 4 bytes long */