[coreboot-gerrit] Change in coreboot[master]: drivers/spi/tpm: Add helper to identify how cr50 sees AP reset

[Karthik Ramasubramanian (Code Review)]

Hello Sam McNally, build bot (Jenkins), Namyoon Woo, Furquan Shaikh, Christian Walter, Edward O'Callaghan, Nick Vaccaro, Tim Wawrzynczak, Karthikeyan Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/44653

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

Change subject: drivers/spi/tpm: Add helper to identify how cr50 sees AP reset
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drivers/spi/tpm: Add helper to identify how cr50 sees AP reset

Introduce a helper to identify if Cr50 uses SYS_RESET# signal to
observe the AP reset. This helper is used to trigger an appropriate AP
reset when CSE Lite jumps from RO to RW.

BUG=None
TEST=Ensure that Drawcia board boots to OS. Ensure that global reset is
triggered when cr50 is running firmware versions newer than 0.0.22. On
cr50 versions 0.0.22 or older, EC triggers cold reset of AP.

Change-Id: Id84b152993f253878a6c133cc433a0da2c990cf2
Signed-off-by: Karthikeyan Ramasubramanian 
---
M src/drivers/spi/tpm/tpm.c
M src/drivers/spi/tpm/tpm.h
2 files changed, 16 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/44653/2