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soc/intel/broadwell: Set FADT `duty_offset` to 0 

From ACPI specification, version 6.2 Errata A:

 A `duty_width` value of 0 indicates that processor duty cycle is not
 supported and the processor continuously runs at its base frequency.

Because Broadwell sets `duty_width` to 0, processor duty cycle is not
supported, and the value of `duty_offset` is ignored. For consistency
with Lynx Point, set `duty_offset` to 0.

Change-Id: I68cb85ec32a6cceda0cea29d76df6c6219b78a40
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57493
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
This commit is contained in:
Angel Pons 2021-09-08 12:06:53 +02:00 committed by Felix Held
parent 467eb569c0
commit e9b71d91c2
1 changed files with 1 additions and 1 deletions
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2
src/soc/intel/broadwell/pch/fadt.c
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@ -32,7 +32,7 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
/* P_LVLx not used */
fadt->p_lvl2_lat = 101;
fadt->p_lvl3_lat = 1001;
fadt->duty_offset = 1;
fadt->duty_offset = 0;
fadt->duty_width = 0;
fadt->day_alrm = 0xd;
fadt->mon_alrm = 0x00;