tree c7041d3c81568c95cc40932388e2cfc4bd74937d
parent c7a0ea28424dd826612be8e1534a6fcad9a9e1ea
author Jay Patel <jay2.patel@intel.com> 1685653303 -0700
committer Jakub Czapiga <jacz@semihalf.com> 1693390965 +0000

soc/intel/meteorlake: Allow to override Fast Vmode

This patch adds option to override Fast Vmode on Meteor Lake SoC.
This requires CepEnable, EnableFastVmode, IccLimit FSPM UPDs in FSP
header. If the hardware supports Fast Vmode, the FSPM will set the
ICC limit value to the value passed from coreboot.

With CepEnable and EnableFastVmode enabled, if IccLimit is not
specified by coreboot, FSPM sets IccLimit as default value. If no
values assigned to all the three CepEnable, EnableFastVmode and
IccLimit, coreboot sets their values to 0 and Fast Vmode is disabled.

BUG=b:286809233
TEST=In debug MTL FSP logs, the value of FSP parameters is as passed
from coreboot including enable_fast_vmode, cep_enable, and
fast_vmode_i_trip. Also, fast_vmode_i_trip value is passed to pcode
using mailbox command without any error. This test done on google/rex
board.

Signed-off-by: Jay Patel <jay2.patel@intel.com>
Change-Id: Id05dccac56c504523f9327babe0c6fbeff488ec2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75566
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>