tree 14c28cade53f8f64755f3d660149c3c7d501fd1d
parent 0753f6e0a3d9568fb6b8e34753b944d9f8eed05b
author Zhao Yakui <yakui.zhao@intel.com> 1195117505 +0800
committer Len Brown <len.brown@intel.com> 1195267401 -0500

ACPI: Use _TSS for throttling control, when present. Add error checks.

_TSS was erroneously ignored, in favor of the FADT.

When TSS is used, the access width is included in the PTC control/status
register.  So it is unnecessary that the access bit width is multiplied by 8.
At the same time the bit_offset should be considered for system I/O Access.

It should be checked the bit_width and bit_offset of PTC regsiter in order to
avoid the failure of system I/O access. It means that bit_width plus
bit_offset can't be greater than 32.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>