spi/tpm.c do not waste time on wake pulses unless necessary

The Cr50 secure chip implementation is guaranteed not to fall asleep
for 1 second after any SPI slave activity.

Let's not waste time on the wake up ping when it is not necessary.

BRANCH=cr50
BUG=b:68012381
TEST=using a protocol analyzer verified that the wake pulses are
     generated only when the new coreboot stage or depthcharge start,
     not on every SPI slave transaction.

Change-Id: Id8def1470ba3eab533075b9e7180f8a58e0b00b6
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/22321
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions