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Relax the WFI instruction requirement in system suspend #66

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Oct 11, 2024
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Relax the WFI instruction requirement in system suspend #66

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20 changes: 11 additions & 9 deletions src/srvgrp-system-suspend.adoc
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Expand Up @@ -184,21 +184,23 @@ which platform must configure for the resuming application processor.

==== Service: SYSSUSP_SUSPEND (SERVICE_ID: 0x03)
This service is used to request the platform microcontroller to transition the
system in a suspend state. This service returns successfully if the platform
system in a suspend state. This service returns successfully when the platform
microcontroller accepts the system suspend request. The application processor
which called this service must enter into the WFI state by executing the `WFI`
instruction. The platform microcontroller will transition the system to the
requested `SUSPEND_STATE` upon the successful WFI state transition of the
application processor.
which called this service must then enter into a quiesced state such as WFI. The
platform microcontroller will transition the system to the requested
`SUSPEND_STATE` upon the successful transition of the application processor into
the supported quiesced state. The mechanism for detecting the quiesced state of
the application processor is platform specific.

The application processor must only request supported suspend types, discovered
using the `SYSSUSP_GET_ATTRIBUTES` service.

If a suspend type does not support the custom resume address which the
application processor can discover by the `SYSSUSP_GET_ATTRIBUTES` service
If a suspend type does not support the custom resume address that the
application processor can discover through the `SYSSUSP_GET_ATTRIBUTES` service
then the `RESUME_ADDR_LOW` and `RESUME_ADDR_HIGH` will be ignored and the
application processor in WFI state will resume from the `pc` (program counter)
after the `WFI` instruction.
application processor will resume from the `pc` (program counter) after the
instruction that put the application processor in the quiesced state,
such as the `WFI` instruction.

[#table_syssuspend_syssuspend_request_data]
.Request Data
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