Set USB2 port 4 pre emphasis to 15mV for passing USB2 port 4 SI (margin eye diagram).
BUG=b:210755120
TEST=emerge-ambassadorcoreboot chromeos-bootimage; Build local fw and pass to HW for measuring USB2 port 4 eye diagram.
Signed-off-by: Kenneth Chan <kenneth.chan@quanta.corp-partner.google.com>
Change-Id: I8163b2be6c9094eaf08efc0325cf211235556dc8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60131
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
1d3cff3f61