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mb/google/nissa: Disable the Package C-state demotion

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Disabling the Package C-state demotion feature for nissa baseboard
as a work around to the S0ix issue and also this doesn't have any
impact on the power and performance measured and verified by the
PNP team.

This feature will be enabled after its functionality is verified with no
issues and also based on its impact on PNP.

BUG=b:235005582
TEST=Boot and verify that S0ix issue is resolved.

Signed-off-by: V Sowmya <v.sowmya@intel.com>
Change-Id: I4d586b962c27b86ee75651dcd655bc0868504646
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65664
Reviewed-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
V Sowmya 2022-07-05 20:56:55 +05:30 committed by Subrata Banik
parent 4be8d9e80d
commit 0f7580e5cc
1 changed files with 4 additions and 0 deletions
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4
src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb
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@ -81,6 +81,10 @@ chip soc/intel/alderlake
register "pch_hda_idisp_link_frequency" = "HDA_LINKFREQ_96MHZ"
register "pch_hda_idisp_codec_enable" = "1"
# FIXME: To be enabled in future based on PNP impact data.
# Disable Package C-state demotion for nissa baseboard.
register "disable_package_c_state_demotion" = "1"
# Intel Common SoC Config
#+-------------------+---------------------------+
#| Field | Value |