[M] Change in coreboot[main]: drivers/intel/fsp2_0: Add early low-battery shutdown during memory init

[Subrata Banik (Code Review)]

Attention is currently required from: Andrey Petrov, Intel coreboot Reviewers, Julius Werner, Jérémy Compostella, Kapil Porwal, Karthik Ramasubramanian, Ronak Kanabar.

Hello Andrey Petrov, Intel coreboot Reviewers, Julius Werner, Jérémy Compostella, Kapil Porwal, Karthik Ramasubramanian, Ronak Kanabar, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/86452?usp=email

to look at the new patch set (#8).

The following approvals got outdated and were removed:
Code-Review+1 by Jérémy Compostella, Code-Review+2 by Kapil Porwal, Verified+1 by build bot (Jenkins)

Change subject: drivers/intel/fsp2_0: Add early low-battery shutdown during memory init
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drivers/intel/fsp2_0: Add early low-battery shutdown during memory init

This commit introduces an early low-battery shutdown mechanism during
FSP memory initialization. This is particularly important during
firmware updates, where memory training can consume significant power
and lead to abrupt shutdowns, potentially corrupting the firmware.

The changes include:

- Adding platform_display_early_shutdown_notification() to notify the
user of the impending shutdown.
- Checking platform_is_low_battery_shutdown_needed() to determine if a
shutdown is necessary.
- Implementing a shutdown sequence if low battery is detected during
memory init, especially when no MRC cache is found (i.e. firmware
update).
- Deferring shutdown on systems without MAINBOARD_HAS_EARLY_LIBGFXINIT
so that FSP-M (uGOP) can display a message.

This prevents firmware update corruption due to low battery.

BUG=b:339673254
TEST=Verified low battery boot event logging and controlled shutdown.

Change-Id: Ia135b238d1e16722c2ca8d3b461e83b4ce513adf
Signed-off-by: Subrata Banik 
---
M src/drivers/intel/fsp2_0/include/fsp/api.h
M src/drivers/intel/fsp2_0/memory_init.c
2 files changed, 56 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/52/86452/8