[coreboot-gerrit] Change in coreboot[master]: mb/google/volteer: Update Eldrid USB2 port settings in overridetree

[Tim Wawrzynczak (Code Review)]

Tim Wawrzynczak has submitted this change. ( https://review.coreboot.org/c/coreboot/+/47863 )

Change subject: mb/google/volteer: Update Eldrid USB2 port settings in overridetree
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mb/google/volteer: Update Eldrid USB2 port settings in overridetree

1. Disable M.2 WWAN and Type-A Port A1
2. Change register 4 to 3 and tuning USB2 Port1 eye diagram
3. Lower camera driving

BUG=b:169105751
Signed-off-by: Nick Chen 
Change-Id: I6b8a5c0d5e814de232d79a43354f5ec0220fc5ea
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47863
Tested-by: build bot (Jenkins) 
Reviewed-by: Tim Wawrzynczak 
---
M src/mainboard/google/volteer/variants/eldrid/overridetree.cb
1 file changed, 14 insertions(+), 4 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Tim Wawrzynczak: Looks good to me, approved

diff --git a/src/mainboard/google/volteer/variants/eldrid/overridetree.cb b/src/mainboard/google/volteer/variants/eldrid/overridetree.cb
index 72571c0..51bc991 100644
--- a/src/mainboard/google/volteer/variants/eldrid/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/eldrid/overridetree.cb
@@ -58,12 +58,22 @@
    		},
    	},
    }"
-	#These settings improve the USB2 Port1 eye diagram
+
+	#Disable Type-A Port A1
+	register "usb2_ports[1]" = "USB2_PORT_EMPTY"
+
+	#Disable M.2 WWAN
+	register "usb2_ports[2]" = "USB2_PORT_EMPTY"
+
+	#improve the USB2 Port1 eye diagram
+	register "usb2_ports[3]" = "USB2_PORT_SHORT(OC_SKIP)"
+
+	#lower camera driving
    register "usb2_ports[4]" = "{
    	.enable = 1,
-		.tx_bias = 7,
-		.tx_emp_enable = 7,
-		.pre_emp_bias = 3,
+		.tx_bias = 0,
+		.tx_emp_enable = 0,
+		.pre_emp_bias = 0,
    	.pre_emp_bit = 0,
    }"