soc/intel: Allow enable/disable ME via CMOS

Add .enable method that will set the CSME state. The state is based on
the new CMOS option me_state, with values of 0 and 1. The method is very
stable when switching between different firmware platforms.

This method should not be used in combination with USE_ME_CLEANER.

State 1 will result in:
ME: Current Working State   : 4
ME: Current Operation State : 1
ME: Current Operation Mode  : 3
ME: Error Code              : 2

State 0 will result in:
ME: Current Working State   : 5
ME: Current Operation State : 1
ME: Current Operation Mode  : 0
ME: Error Code              : 0

Tested on:
KBL-R: i7-8550u
CML: i3-10110u, i7-10710u
TGL: i3-1110G4, i7-1165G7

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I374db3b7c0ded71cdc18f27970252fec7220cc20
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52800
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Crawford <tcrawford@system76.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

0 files changed, 0 insertions, 0 deletions