Change in coreboot[master]: soc/intel/common/acpi: add ACPI S0ix _DSM for Intel Power Engine Plug-in

[Paul Menzel (Code Review)]

Attention is currently required from: Cliff Huang, Patrick Rudolph.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55127 )

Change subject: soc/intel/common/acpi: add ACPI S0ix _DSM for Intel Power Engine Plug-in
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Patch Set 4: Code-Review+1

(5 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/55127/comment/2667c8ff_5f17b7c5 
PS4, Line 9: ( UUID:
Please remove the space after (.

https://review.coreboot.org/c/coreboot/+/55127/comment/a72de2a0_10f24a06 
PS4, Line 22: need to implemented
needs to be implemented

File src/soc/intel/common/block/acpi/Kconfig:

https://review.coreboot.org/c/coreboot/+/55127/comment/1e5699fb_7a0ef0f4 
PS4, Line 34: s0ix
S0ix

https://review.coreboot.org/c/coreboot/+/55127/comment/4e4b44b6_653195e0 
PS4, Line 34: 	  Generate s0ix entries for Intel power engine plug-in
Maybe add:
> Linux exposes this under `/sys/kernel/debug/pmc_core/substate_requirement_registers`.

File src/soc/intel/common/block/acpi/acpi/pep.asl:

https://review.coreboot.org/c/coreboot/+/55127/comment/92c99a78_58f69f11 
PS4, Line 16: #define PEPD_PMC_PWRM_LPM_REQ_BITS_DATA_LEN 1536
I’d only use the first macro, and calculate the bit value from it.