[XS] Change in coreboot[main]: mb/google/brya: Correct EC-is-trusted logic

[Qinghong Zeng (Code Review)]

Attention is currently required from: Kapil Porwal, Nick Vaccaro, Qinghong Zeng, Reka Norman, Subrata Banik.

Hello Eric Lai, Kapil Porwal, Nick Vaccaro, Reka Norman, Subrata Banik, Weimin Wu, Yu-Ping Wu, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/80158?usp=email

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

Change subject: mb/google/brya: Correct EC-is-trusted logic
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mb/google/brya: Correct EC-is-trusted logic

With Cr50, the GPIO EC_IN_RW is used to determine whether EC is
trusted. However, with Ti50 where brya has been switched to, it is
determined by Ti50's boot mode. If the boot mode is TRUSTED_RO, the
VB2_CONTEXT_EC_TRUSTED flag will be set in check_boot_mode(). Therefore
in the Ti50 case get_ec_is_trusted() can just return 0.

The current code of get_ec_is_trusted() only checks the GPIO, which
causes the EC to be always considered "trusted". Therefore, correct the
return value to 0 for TPM_GOOGLE_TI50.

BUG=b:321172119
TEST=emerge-nissa coreboot chromeos-bootimage
TEST=firmware_DevMode passed in FAFT test

Change-Id: I308f8b36411030911c4421d80827fc49ff325a1b
Signed-off-by: zengqinghong 
---
M src/mainboard/google/brya/chromeos.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/58/80158/2