[S] Change in coreboot[master]: mb/google/brask/var/constitution: correct Type-A USB3 port0/1 tx_de_emp

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/74142 )

Change subject: mb/google/brask/var/constitution: correct Type-A USB3 port0/1 tx_de_emp
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mb/google/brask/var/constitution: correct Type-A USB3 port0/1 tx_de_emp

Set Type-A USB3 port0/1 tx_de_emp to 0x2B to fix the USB3 Gen2
RX signal integrity issue.

BUG=None
TEST=build FW and check Type-A USB3 port0/port1 RX pass

Change-Id: I9296ae5a8a9d7aa49b3c7529a9c1b2d2829b15d0
Signed-off-by: Morris Hsu 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74142
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
Reviewed-by: Nick Vaccaro 
---
M src/mainboard/google/brya/variants/constitution/overridetree.cb
1 file changed, 33 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nick Vaccaro: Looks good to me, approved
  Eric Lai: Looks good to me, approved

diff --git a/src/mainboard/google/brya/variants/constitution/overridetree.cb b/src/mainboard/google/brya/variants/constitution/overridetree.cb
index 67684b9..4b894b0 100644
--- a/src/mainboard/google/brya/variants/constitution/overridetree.cb
+++ b/src/mainboard/google/brya/variants/constitution/overridetree.cb
@@ -22,6 +22,19 @@
    register "usb2_ports[5]" = "USB2_PORT_EMPTY"	# Disable USB2 Port 5
    register "usb2_ports[6]" = "USB2_PORT_EMPTY"	# Disable USB2 Port 6

+	register "usb3_ports[0]" = "{
+		.enable           = 1,
+		.ocpin            = OC_SKIP,
+		.tx_de_emp        = 0x2B,
+		.tx_downscale_amp = 0x00,
+	}" # Type-A port A0
+	register "usb3_ports[1]" = "{
+		.enable           = 1,
+		.ocpin            = OC_SKIP,
+		.tx_de_emp        = 0x2B,
+		.tx_downscale_amp = 0x00,
+	}" # Type-A port A1
+
    register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)" # HDMI-IN
    register "usb3_ports[3]" = "USB3_PORT_EMPTY"	# Disable Type-A port A3