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Revert "ACPICA: FADT support cleanup"

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Pavel Machek reports that commit 6ea8c546f3 (ACPICA: FADT support
cleanup) breaks thermal management on his Thinkpad X60 and T40p, so
revert it.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=187311
Fixes: 6ea8c546f3 (ACPICA: FADT support cleanup)
Reported-by: Pavel Machek <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2016-11-14 20:56:17 +01:00
commit e2174b0c24
2 changed files with 74 additions and 100 deletions
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10
drivers/acpi/acpica/tbfadt.c
View file

@ -480,19 +480,17 @@ static void acpi_tb_convert_fadt(void)
u32 i;
/*
* For ACPI 1.0 FADTs (revision 1), ensure that reserved fields which
* For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
* should be zero are indeed zero. This will workaround BIOSs that
* inadvertently place values in these fields.
*
* The ACPI 1.0 reserved fields that will be zeroed are the bytes located
* at offset 45, 55, 95, and the word located at offset 109, 110.
*
* Note: The FADT revision value is unreliable because of BIOS errors.
* The table length is instead used as the final word on the version.
*
* Note: FADT revision 3 is the ACPI 2.0 version of the FADT.
* Note: The FADT revision value is unreliable. Only the length can be
* trusted.
*/
if (acpi_gbl_FADT.header.length <= ACPI_FADT_V3_SIZE) {
if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
acpi_gbl_FADT.preferred_profile = 0;
acpi_gbl_FADT.pstate_control = 0;
acpi_gbl_FADT.cst_control = 0;