tree e8e91e0ce811788a112df0234aad1f8fd9382205
parent 4843ded47c3e72ee112a1ea79f03017f6999c1e1
author Tarun Tuli <taruntuli@google.com> 1666724254 +0000
committer Eric Lai <eric_lai@quanta.corp-partner.google.com> 1677026755 +0000

mb/google/poppy: Nami - invoke power cycle of FPMCU on startup

Add functionality such that the FPMCU is power cycled long enough
on boot to ensure proper reset.

This solution relies solely on coreboot to sequence the power and reset
signals appropriately (150ms on boot).

BUG=b:245954151
TEST=Confirmed FPMCU is still functional on Nami.
Confirmed power is off for 150ms seconds on boot.
Confirmed RCC_CSR of FPMCU indicates power cycle occurred.
Confirmed reset is de-asserted approx 3ms after power application
(target >2.5ms)

Change-Id: I21eb85dc11e0ea0eb5de8a6092b01663d3c3df91
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68820
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>