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mb/google/brox/var/jubilant: Disable Tccold Handshake

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The patch disables Tccold Handshake to prevent possible display
flicker issue for jubilant board. Please refer to Intel doc#723158
for more information.

BUG=b:383433239
BRANCH=firmware-brox-16080.B
TEST=Boot to OS on jubilant, verify the display is without flicker.

Change-Id: I4f22067b81fa1b1b9addd7d1f49de59136d221c0
Signed-off-by: Ren Kuo <ren.kuo@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85555
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Ren Kuo 2024-12-11 12:48:29 +08:00 • committed by Subrata Banik
commit b793209b80
1 changed files with 4 additions and 0 deletions
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4
src/mainboard/google/brox/variants/jubilant/overridetree.cb
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@ -21,6 +21,10 @@ end
chip soc/intel/alderlake
register "platform_pmax" = "208"
# As per Intel Advisory doc#723158, the change is required to prevent possible
# display flickering issue.
register "disable_dynamic_tccold_handshake" = "true"
register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC_SKIP)" # USB2_C0
register "usb2_ports[1]" = "USB2_PORT_EMPTY" # Disable USB2 Port
register "usb2_ports[2]" = "USB2_PORT_TYPE_C(OC_SKIP)" # USB2_C2