In order to prevent possible TPM lockout due to PLTRST assertion
shortly after powering up add a small delay before the reset.
This will affect cold power up only, reboot/resume/warmboot will
all have the flex ratio locked already so this reset is unneeded.
BUG=chrome-os-partner:29859
BRANCH=None
TEST=build and boot on samus. I tried unsuccessfully to trigger the
TPM lockout, but I was not able to do that consistently without this
patch so it is unknown yet whether this is 100% effective.
Change-Id: Ief8c9261c0268b0f90a3022213ebd2b06633b481
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/211893
Reviewed-by: Aaron Durbin <adurbin@chromium.org>