Commit d17cb18a authored by Len Brown's avatar Len Brown

Revert "ACPI: Ingore the RESET_REG_SUP bit when using ACPI reset mechanism"

This reverts commit 8fd14591.

http://bugzilla.kernel.org/show_bug.cgi?id=11942Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f4a9bc4c
...@@ -15,28 +15,9 @@ void acpi_reboot(void) ...@@ -15,28 +15,9 @@ void acpi_reboot(void)
rr = &acpi_gbl_FADT.reset_register; rr = &acpi_gbl_FADT.reset_register;
/* /* Is the reset register supported? */
* Is the ACPI reset register supported? if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
* rr->bit_width != 8 || rr->bit_offset != 0)
* According to ACPI 3.0, FADT.flags.RESET_REG_SUP indicates
* whether the ACPI reset mechanism is supported.
*
* However, some boxes have this bit clear, yet 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.
*
* So 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
*/
if (!(rr->address) || rr->bit_width != 8 || rr->bit_offset != 0)
return; return;
reset_value = acpi_gbl_FADT.reset_value; reset_value = acpi_gbl_FADT.reset_value;
......
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