From 845b65bf5e8d04e5bbc11d49b07e8b49e36bb023 Mon Sep 17 00:00:00 2001 From: Kevin Chiu Date: Fri, 22 Jan 2021 14:52:53 +0800 Subject: 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/49826 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- .../google/zork/variants/gumboz/overridetree.cb | 39 ++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'src/mainboard') diff --git a/src/mainboard/google/zork/variants/gumboz/overridetree.cb b/src/mainboard/google/zork/variants/gumboz/overridetree.cb index a9dbc10495..73a4a282ff 100644 --- a/src/mainboard/google/zork/variants/gumboz/overridetree.cb +++ b/src/mainboard/google/zork/variants/gumboz/overridetree.cb @@ -21,6 +21,45 @@ chip soc/amd/picasso 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, -- cgit v1.2.3