diff options
author | Zhao Yakui <yakui.zhao@intel.com> | 2008-10-17 14:22:27 -0400 |
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committer | Len Brown <len.brown@intel.com> | 2008-10-18 01:01:12 -0400 |
commit | 8fd145917fb62368a9b80db59562c20576238f5a (patch) | |
tree | 42b81ee305b6f35e98aed2690f696b32cb5c864b /arch/x86 | |
parent | 3fa8749e584b55f1180411ab1b51117190bac1e5 (diff) |
ACPI: Ingore the RESET_REG_SUP bit when using ACPI reset mechanism
According to ACPI 3.0, FADT.flags.RESET_REG_SUP indicates
whether the ACPI reboot mechanism is supported.
However, some boxes have this bit clear, have a valid
ACPI_RESET_REG & RESET_VALUE, and ACPI reboot is the only
mechanism that works for them after S3.
This suggests that other operating systems may not be checking
the RESET_REG_SUP bit, and are using other means to decide
whether to use the ACPI reboot mechanism or not.
Here we stop checking RESET_REG_SUP.
Instead, When acpi reboot is requested,
only the reset_register is checked. If the following
conditions are met, it indicates that the reset register is supported.
a. reset_register is not zero
b. the access width is eight
c. the bit_offset is zero
http://bugzilla.kernel.org/show_bug.cgi?id=7299
http://bugzilla.kernel.org/show_bug.cgi?id=1148
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions