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.. _opal-psr:
OPAL_GET_POWER_SHIFT_RATIO
==============================
OPAL call to read the power-shifting-ratio using a handle to identify
the type (e.g CPU vs. GPU, CPU vs. MEM) which is exported via
device-tree.
The call can be asynchronus, where the token parameter is used to wait
for the completion.
Parameters
----------
::
u32 handle
int token
u32 *ratio
Returns
-------
OPAL_SUCCESS
Success
OPAL_PARAMETER
Invalid ratio pointer
OPAL_UNSUPPORTED
No support for reading psr
OPAL_HARDWARE
Unable to procced due to the current hardware state
OPAL_ASYNC_COMPLETION
Request was sent and an async completion message will be sent with
token and status of the request.
OPAL_SET_POWER_SHIFT_RATIO
==============================
OPAL call to set power-shifting-ratio using a handle to identify
the type of PSR which is exported in device-tree. This call can be
asynchronus where the token parameter is used to wait for the
completion.
Parameters
----------
::
u32 handle
int token
u32 ratio
Returns
-------
OPAL_SUCCESS
Success
OPAL_PARAMETER
Invalid ratio requested
OPAL_UNSUPPORTED
No support for changing the ratio
OPAL_PERMISSION
Hardware cannot take the request
OPAL_ASYNC_COMPLETION
Request was sent and an async completion message will be sent with
token and status of the request.
OPAL_HARDWARE
Unable to procced due to the current hardware state
OPAL_BUSY
Previous request in progress
OPAL_INTERNAL_ERROR
Error in request response
OPAL_TIMEOUT
Timeout in request completion
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