mb/google/zork: update USB 2.0 controller Lane Parameter for gumboz
From AMD USB phy specialist recommended that for DB port2 (type-A), port3 (type-C C1)
the most effective corrections for the depressed eye are
tx_rise_tune=0x0
tx_pre_emp_amp_tune=0x3
tx_fsls_tune = 0x3
BUG=b:173476380
BRANCH=zork
TEST=1. emerge-zork coreboot
2. pass USB 2.0 SI eye diagram verification
Change-Id: Ib31c5d55e30b958d3e552e8d0b4a160947444636
Signed-off-by: Kevin Chiu <kevin.chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49826
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/google/zork/variants/gumboz/overridetree.cb b/src/mainboard/google/zork/variants/gumboz/overridetree.cb
index a9dbc10..73a4a28 100644
--- a/src/mainboard/google/zork/variants/gumboz/overridetree.cb
+++ b/src/mainboard/google/zork/variants/gumboz/overridetree.cb
@@ -21,6 +21,45 @@
register "telemetry_vddcr_soc_offset" = "167"
# End : OPN Performance Configuration
+ # USB 2.0 strength - MB type-C C0
+ register "usb_2_port_tune_params[0]" = "{
+ .com_pds_tune = 0x07,
+ .sq_rx_tune = 0x3,
+ .tx_fsls_tune = 0x3,
+ .tx_pre_emp_amp_tune = 0x03,
+ .tx_pre_emp_pulse_tune = 0x0,
+ .tx_rise_tune = 0x1,
+ .tx_vref_tune = 0xe,
+ .tx_hsxv_tune = 0x3,
+ .tx_res_tune = 0x01,
+ }"
+
+ # USB 2.0 strength - DB type-A
+ register "usb_2_port_tune_params[2]" = "{
+ .com_pds_tune = 0x07,
+ .sq_rx_tune = 0x3,
+ .tx_fsls_tune = 0x3,
+ .tx_pre_emp_amp_tune = 0x03,
+ .tx_pre_emp_pulse_tune = 0x0,
+ .tx_rise_tune = 0x0,
+ .tx_vref_tune = 0xe,
+ .tx_hsxv_tune = 0x3,
+ .tx_res_tune = 0x01,
+ }"
+
+ # USB 2.0 strength - DB type-C C1
+ register "usb_2_port_tune_params[3]" = "{
+ .com_pds_tune = 0x07,
+ .sq_rx_tune = 0x3,
+ .tx_fsls_tune = 0x3,
+ .tx_pre_emp_amp_tune = 0x03,
+ .tx_pre_emp_pulse_tune = 0x0,
+ .tx_rise_tune = 0x0,
+ .tx_vref_tune = 0xe,
+ .tx_hsxv_tune = 0x3,
+ .tx_res_tune = 0x01,
+ }"
+
# I2C2 for touchscreen and trackpad
register "i2c[2]" = "{
.speed = I2C_SPEED_FAST,