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This is required to prevent the EC from shutting down the system after
about 15 seconds after being turned on. If the EC doesn't receive a
command meaning "CPU OK" it assumes that the processor has failed and
flashes a diagnostic code on the keyboard LEDs to indicate this.
This also enables the keyboard and trackpad/trackpoint interfaces.
Parts of this code were derived from yet-to-be merged code in CB:44975
(ec: Add support for MEC5055 for Dell laptops) written by Iru Cai.
Tested on a Dell Latitude E6400
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Change-Id: Ia420cd51e9a64be5eee4af2c0d113618575522b0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59703
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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