The commit 0ba3b2593b0c ("gru: Tuning USB 2.0 PHY to increase
compatibility") bypass ODT to set the max driver strength for
the Type-C otg-port, it works well on otg-port when connected
with USB2.0 devices.
Unfortunately, because the Type-C otg-port and host-port are
consisted in one USB2 PHY, so bypass ODT will have an effect
on both host-port and otg-port. I have tested the host-port
eye-diagram, the result shows that if we bypass ODT, the host-
port eye-diagram height will become to high, more than 500mv,
this may cause USB 2.0 high-speed enumeration failure.
This patch bypass ODT for host-port separately, and then we
can reduce the host-port driver strength without affecting
the otg-port driver strength.
BRANCH=gru
BUG=chrome-os-partner:60727
TEST=Boot system, run 'lsusb' command and check if the usb camera
and usb bluetooth are on usb 2.0 hub or usb 1.1 hub. If they are
on usb 1.1 hub, the issue happens. If not, try to run camera app
and then close camera app, repeat until find that the usb camera
is on the usb 1.1 hub.
Change-Id: Ia1f12182929673c5726df9f77f0903469b5c957a
Signed-off-by: William wu <wulf@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/425739
Commit-Ready: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Inno Park <ih.yoo.park@samsung.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
5ea7660b7b