Change in coreboot[master]: mb/google/zork/vilboz: Disable HDMI 2.0 for Vilboz

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/52724 )

Change subject: mb/google/zork/vilboz: Disable HDMI 2.0 for Vilboz
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mb/google/zork/vilboz: Disable HDMI 2.0 for Vilboz

Disable HDMI 2.0 for Vilboz and then support display resolution 4K 30Hz

BUG=b:179170193
BRANCH=firmware-zork-13434.B
TEST=verified that the resolution of the display is 4K 30Hz

Signed-off-by: Frank Wu 
Change-Id: Ib0dc0d584f0e87bc9c3da85a583cb8c8bed76440
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52724
Tested-by: build bot (Jenkins) 
Reviewed-by: Patrick Huang 
Reviewed-by: Kangheui Won 
---
M src/mainboard/google/zork/variants/vilboz/overridetree.cb
1 file changed, 5 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Kangheui Won: Looks good to me, approved
  Patrick Huang: Looks good to me, but someone else must approve

diff --git a/src/mainboard/google/zork/variants/vilboz/overridetree.cb b/src/mainboard/google/zork/variants/vilboz/overridetree.cb
index fac4c7f..43a64b0d 100644
--- a/src/mainboard/google/zork/variants/vilboz/overridetree.cb
+++ b/src/mainboard/google/zork/variants/vilboz/overridetree.cb
@@ -42,6 +42,11 @@
    register "pwrdown_bloff_to_varybloff" = "5"
    register "min_allowed_bl_level" = "0"

+	# Set HDMI 2.0 disable function
+	# bit0~3: disable HDMI 2.0 DDI0~3
+	# disable DDI1
+	register "hdmi2_disable" = "2"
+
    # USB OC pin mapping
    register "usb_port_overcurrent_pin[1]" = "USB_OC_NONE"	# LTE instead of USB C1