CONFIG_MAILBOX and CONFIG_PCC are enabled.

I also checked the acpidump. The PCCT defines only a "Generic Communications 
Subspace" or Type-0 and not the other two types.
(Ref: 
http://elixir.free-electrons.com/linux/latest/source/include/acpi/actbl3.h#L481)
 

Whereas the acpi_pcc_probe takes count of only these 2 missing/not-
defined PCC subspace types.. I do not know much about this to comment on
why this approach..

(Ref: http://elixir.free-
electrons.com/linux/latest/source/drivers/mailbox/pcc.c#L448)

Would like to have someone explain why kernel does not consider type-0
in this driver.

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https://bugs.launchpad.net/bugs/1555350

Title:
  "Error parsing PCC subspaces from PCCT" during initializing the system

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