The google_chromeec_is_charger_present function previously relied on
executing the EC_CMD_BATTERY_DYNAMIC_INFO command to check the
EC_BATT_FLAG_AC_PRESENT flag.
This commit refactors the function to directly read the host event
register (EC events B) and check for the EC_HOST_EVENT_AC_CONNECTED
event flag instead.
This approach is much more efficient as it avoids the overhead of
sending and receiving a full EC command (savings ~25-30ms), using a
readily available cached status instead.
TEST=Able to build and boot google/quenbi.
Change-Id: I2ec9aca5991394ed1d4998da37e074e9324bd672
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90334
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
8b3ceacd93