[S] Change in coreboot[master]: mb/google/rex: Enable all DDI lanes

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/74413 )

(

4 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: mb/google/rex: Enable all DDI lanes
......................................................................

mb/google/rex: Enable all DDI lanes

This patch enables all DDI ports on Rex board to support display port
tunneling and dual display on TBT dock.

BUG=b:273901499
TEST=Boot google/rex and connect two displays over a TBT dock and check the display functionality.

Signed-off-by: Anil Kumar 
Change-Id: I45ee5334fbb877bd58912c8d24920037f155dc42
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74413
Reviewed-by: Subrata Banik 
Reviewed-by: Kapil Porwal 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/rex/variants/rex0/overridetree.cb
1 file changed, 24 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Subrata Banik: Looks good to me, approved
  Kapil Porwal: Looks good to me, approved

diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index 17e4c3e..ebe1428 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -67,6 +67,10 @@
    register "ddi_ports_config" = "{
    	[DDI_PORT_A] = DDI_ENABLE_HPD,
    	[DDI_PORT_B] = DDI_ENABLE_HPD | DDI_ENABLE_DDC,
+		[DDI_PORT_1] = DDI_ENABLE_HPD,
+		[DDI_PORT_2] = DDI_ENABLE_HPD,
+		[DDI_PORT_3] = DDI_ENABLE_HPD,
+		[DDI_PORT_4] = DDI_ENABLE_HPD,
    }"

register "serial_io_gspi_mode" = "{