[coreboot-gerrit] Change in coreboot[master]: soc/mediatek: Fix USB enumeration issue

[Ran Bi (Code Review)]

Hello Yu-Ping Wu, Julius Werner, CK HU, You-Cheng Syu, Tristan Hsieh, Hung-Te Lin, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/35150

to look at the new patch set (#2).

Change subject: soc/mediatek: Fix USB enumeration issue
......................................................................

soc/mediatek: Fix USB enumeration issue

Some USB3.0 devices are failed to enumerate after USB reset,
and xhci port status register show device is disconnected.
After measuring USB signal, we found that usb disconnect threshold was lower
and disconnect event is triggered unexpectedly.

USB designer suggests to change discth to 15.

BUG=b:122047652
TEST=emerge-kukui coreboot chromeos-bootimage

Change-Id: I0e8556035b49d693a42cbe1099a6882a1c0ed0d1
Signed-off-by: Changqi Hu 
---
M src/soc/mediatek/common/include/soc/usb_common.h
M src/soc/mediatek/common/usb.c
2 files changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/50/35150/2