[coreboot-gerrit] [M] Change in coreboot[master]: soc/intel/{adl, cmn}: Send CSE EOP Async CMD early

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli.

Hello build bot (Jenkins), Tarun Tuli,

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

https://review.coreboot.org/c/coreboot/+/74293

to look at the new patch set (#2).

Change subject: soc/intel/{adl, cmn}: Send CSE EOP Async CMD early
......................................................................

soc/intel/{adl, cmn}: Send CSE EOP Async CMD early

This patch sends the CSE EOP command asynchronous implementation early
as part of `soc_init_pre_device`.

Without this patch the duration between asynchronous CSE EOP send and
receive commands is not ample whichcauses idle delay while waiting
for EOP response.

The goal of the CSE async implementation is to avoid idle delay while
capturing the response from CSE EOP cmd.

This patch helps to create ample duration between CSE EOP command
being sent and response being captured.

TEST=Able to boot google/marasov EVT sku to ChromeOS and observed
~30ms of boot time savings (across warm and cold reset scenarios).

Without this patch:

963:returning from FspMultiPhaseSiInit          907,326 (97,293)
  ...
  ...
  115:finished elog init                          967,343 (2,581)
  942:before sending EOP to ME                    967,821 (478)
  … 
  16:finished LZMA decompress (ignore for x86)    1,017,937 (12,135)
  943:after sending EOP to ME                     1,067,799 (49,861)
  …
  …
  1101:jumping to kernel                          1,144,587 (13,734)

Total Time: 1,144,549

With this patch:
  963:returning from FspMultiPhaseSiInit          918,291 (97,320)
  942:before sending EOP to ME                    918,522 (230)
  ...
  ...
  16:finished LZMA decompress (ignore for x86)    1,029,476 (12,483)
  943:after sending EOP to ME                     1,033,456 (3,980)
  ...
  ...
  1101:jumping to kernel                          1,111,410 (14,007)

Total Time: 1,111,375

Change-Id: Idaf45ef28747bebc02347f0faa77cc858a4a8ef1
Signed-off-by: Subrata Banik 
---
M src/soc/intel/alderlake/chip.c
M src/soc/intel/common/block/cse/cse.c
2 files changed, 68 insertions(+), 11 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/74293/2