[coreboot] Patch merged into coreboot/master: 8b58555 ACPI: Add support for runtime config TDP down

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 8b58555a396576d2ab85e0e724ca8cfd679bddfd
Author: Duncan Laurie <dlaurie at chromium.org>
Date:   Mon Jul 16 12:27:42 2012 -0700

    ACPI: Add support for runtime config TDP down
    
    The required power MSRs are mirrored in MCHBAR so
    it is possible to configure TDP at runtime via ASL.
    
    This adds the required fields and a set of methods to
    configure "TDP down" and "TDP nominal".  It explicitly
    does not support "TDP up" at the moment.
    
    PSSS: method is added to assist in searching the _PSS
    table for the appropriate entry that corresponds to the
    desired max non-turbo ratio.
    
    STND: Set TDP Down from Nominal.  This will limit CPU to
    the TDP down configuration by sequencing the required
    changes in the right order.
    
    STDN: Set TDP Nominal from Down.  This will set the CPU
    back to nominal configuration by sequencing the required
    changes in the correct (reverse) order.
    
    This does not introduce any functional changes and must
    be paired with additional changes to be useful.
    
    The current configured TDP can be checked to see that
    the transition to/from a desired level is successful.
    
    > mmio_read8 0xfed15f50
    0x00  # TDP-Nominal
    
    > mmio_read8 0xfed15f50
    0x01  # TDP-Down
    
    Change-Id: I31a2f30cc9d134cc5eee980ae9288ae45e71c6e6
    Signed-off-by: Duncan Laurie <dlaurie at chromium.org>

Build-Tested: build bot (Jenkins) at Wed Jul 25 04:23:22 2012, giving +1
Reviewed-By: Ronald G. Minnich <rminnich at gmail.com> at Thu Jul 26 20:33:05 2012, giving +2
See http://review.coreboot.org/1344 for details.

-gerrit