[S] Change in coreboot[master]: soc/intel/meteorlake: Allow sending late EOP cmd to CSE

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli, Kapil Porwal.

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/69999 )

Change subject: soc/intel/meteorlake: Allow sending late EOP cmd to CSE
......................................................................

soc/intel/meteorlake: Allow sending late EOP cmd to CSE

This patch selects SOC_INTEL_CSE_SEND_EOP_LATE config to let IA
common code to skip sending CSE EOP cmd during finalize operation
rather uses boot state machine (either payload load or payload boot)
to delay in sending EOP cmd to CSE.

BUG=none
TEST=Able to boot to Google/Rex with this patch and observed ~150ms
savings in boot time

Without this patch:

942:before sending EOP to ME	1,795,702 (354)
943:after sending EOP to ME	1,950,526 (154,824)

With this patch:

942:before sending EOP to ME	2,051,406 (35,484)
943:after sending EOP to ME	2,057,583 (6,177)

Signed-off-by: Subrata Banik 
Change-Id: I7d44d5eff890ac78e3075d49cc249f740686dd0d
---
M src/soc/intel/meteorlake/Kconfig
1 file changed, 30 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/99/69999/1

diff --git a/src/soc/intel/meteorlake/Kconfig b/src/soc/intel/meteorlake/Kconfig
index c3efd3e..fb99d30 100644
--- a/src/soc/intel/meteorlake/Kconfig
+++ b/src/soc/intel/meteorlake/Kconfig
@@ -82,6 +82,7 @@
    select SOC_INTEL_COMMON_PCH_CLIENT
    select SOC_INTEL_COMMON_RESET
    select SOC_INTEL_COMMON_BLOCK_IOC
+	select SOC_INTEL_CSE_SEND_EOP_LATE
    select SOC_INTEL_CSE_SET_EOP
    select SOC_INTEL_GFX_NON_PREFETCHABLE_MMIO
    select SOC_INTEL_MEM_MAPPED_PM_CONFIGURATION