g: check that the tx fifo is ready before writing it

USB TX FIFO should be checked for readiyness before trying to
moving data from uart consumer queue to usb producer queue.

BUG=b:126909037
BRANCH=cr50
TEST=manually ran the script below.
i=0
while true; do
  dut-control power_state:off && dut-control power_state:rec && \
  dut-control lid_open
  i=$((i+1))
  echo $i
done

Change-Id: I56316165c2ce420029fdc9d594bf1c5274a002d1
Signed-off-by: Namyoon Woo <namyoon@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1515816
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-by: Karthikeyan Ramasubramanian <kramasub@chromium.org>

0 files changed, 0 insertions, 0 deletions