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OPAL_PCI_GET_POWER_STATE
========================
Get PCI slot power state
Parameter
---------
``uint64_t id``
PCI slot ID
``uint64_t data``
memory buffer pointer for power state
Calling
-------
Retrieve PCI slot's power state. The retrieved power state is stored
in buffer pointed by @data.
Return Codes
------------
OPAL_SUCCESS
PCI slot's power state is retrieved successfully
OPAL_PARAMETER
The indicated PCI slot isn't found
OPAL_UNSUPPORTED
Power state retrieval not supported on the PCI slot
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