[M] Change in coreboot[main]: soc/intel/pantherlake: Add core scaling factors read support

[Jérémy Compostella (Code Review)]

Attention is currently required from: Kapil Porwal, Pranava Y N, Subrata Banik.

Hello Kapil Porwal, Pranava Y N, Subrata Banik, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/85554?usp=email

to look at the new patch set (#10).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: soc/intel/pantherlake: Add core scaling factors read support
......................................................................

soc/intel/pantherlake: Add core scaling factors read support

This commit adds support for reading core scaling factors via the
PCODE mailbox interface.

Starting with Lunar Lake, the scaling factor information is
centralized in the power control unit (PCU) firmware. In order to keep
all firmware in sync, it is recommended to read the scaling factors
from the PCU firmware instead of using hard-coded values.

The following changes were made:

- Updated the Kconfig file to select
  SOC_INTEL_COMMON_BLOCK_RUNTIME_CORE_SCALING_FACTORS option

- Modified the acpi.h header file to export the cpu_perf_eff_type
  enumeration for CPU performance/efficiency types.

- Added a new function to the pantherlake systemagent.c file,
  soc_read_core_scaling_factors(), which reads the core scaling
  factors from the PCODE mailbox interface. The pcode
  READ_CORE_SCALING_FACTOR is presented in document 829201 Panther
  Lake Processor Mailbox Command.

The performance impact on boot time is minimal. It took 12 us to read
the scaling factors on a fatcat device.

TEST=Successfully read performance and efficient scaling factors on a
     fatcat board.

Change-Id: I7a8e1e66a02e4bf6b1a41277e83c6dec786fe169
Signed-off-by: Jeremy Compostella 
---
M src/soc/intel/common/block/acpi/cpu_hybrid.c
M src/soc/intel/common/block/include/intelblocks/acpi.h
M src/soc/intel/pantherlake/Kconfig
M src/soc/intel/pantherlake/include/soc/systemagent.h
M src/soc/intel/pantherlake/systemagent.c
5 files changed, 148 insertions(+), 13 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/54/85554/10