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a4621c5e64
In practice, ADC conversion rarely takes more than 35ms. However, according to the datasheet, ADC conversion may take up to 200ms. But we can't wait for that long, otherwise host command would time out. So here we set ADC timeout as 50ms. If ADC times out, we just return the last read vbus_mv. BUG=b:70641844, chromium:780364 BRANCH=scarlet TEST=test 'ectool usbpdpower' for 50k cycles w/o seeing host command timeout Change-Id: I09c3abf729e96b113f7a0f64a67cd35906da9e3e Signed-off-by: Philip Chen <philipchen@google.com> Reviewed-on: https://chromium-review.googlesource.com/956900 Commit-Ready: Philip Chen <philipchen@chromium.org> Tested-by: Philip Chen <philipchen@chromium.org> Reviewed-by: Alexandru M Stan <amstan@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org>