ACPI power management with SCMI on RdN2 platforms

Through the RDN2 infrastructure developed at ARM it is possible to set up a test environment

in order to verify sending SCMI commands within AML power methods.

To set up the platform the steps described in

https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/tree/master/docs/infra/rdn2

should be followed.

The release tag currently used to carry out the experiment is:

https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/blob/master/docs/infra/releases/RD-INFRA-2022.08.18/release_note.rst

The test carried out is the buildroot boot, as described in:

https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/blob/master/docs/infra/common/buildroot-boot.rst

The code that implements the testbench is split into three components, edk2-platform, scp and arm-TF.

They should be applied on top of the code pulled by the RD-infrastructure with the release tag provided

above (2022.08.18).

The scp patch

adds:

• the MHU2 non-secure channel required by OSPM to communicate to the SCP over PCC

• a virtual power domain to control power states

• SCMI agent to handle MHU2 communication

The EDK2 patches

add:

• PCCT table

• DMA PL330 PSx power methods (and PCC opregion)

The ARM-TF patch

is a hack required to make MHU2 protocol work on the FVP.