tree c63cf7b2d81383305e33de9c34f47b0a2920df9d
parent 39c279acf89ec4cc7b8ca57c2e9f0f4bc897df54
author Tarun Tuli <taruntuli@google.com> 1677075721 +0000
committer Felix Held <felix-coreboot@felixheld.de> 1682735522 +0000

mb/google/poppy/variant/nami - Ensure power cycle of FPMCU on startup

Add functionality to ensure 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).

-Confirmed power is off for 150ms on boot.
-Confirmed RCC_CSR of FPMCU indicates power cycle occurred.
-Confirmed reset is de-asserted approx 3ms after power application
(target >2.5ms)


BUG=b:245954151
TEST=Confirmed FPMCU is still functional on Nami and timings are
as expected.

Change-Id: I0a23bda96bc2ea90be81a2310605f75c55c0a839
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73212
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Shelley Chen <shchen@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>