[coreboot-gerrit] Patch merged into coreboot/master: ACPI: Work around IASL warning reading/writing same register

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit f77516cb6dcc4671938475926d2ee55952cd2eec
Author: Martin Roth <martinroth at google.com>
Date:   Tue Dec 8 14:00:07 2015 -0700

    ACPI: Work around IASL warning reading/writing same register
    
    The newer versions of IASL are unhappy when an operator
    has the same object as both source and destination.
    
    The warning can be completely disabled with a command
    line argument, but in general, I'd really rather not
    just disable warnings.
    
    The bits in this register are write 1 to clear, so reading and
    writing the same register is what we want to do.  Instead, store
    it in a temporary register then write it in a second operation.
    
    Fixes warning:
    dsdt.aml   1396:  Store(PWST, PWST)
    Warning  3023 -                 ^ Duplicate value in list
    (Source is the same as Target)
    
    Change-Id: I52d73d4431db237be83016d67cd397f31b53d9c6
    Signed-off-by: Martin Roth <martinroth at google.com>
    Reviewed-on: https://review.coreboot.org/12691
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>


See https://review.coreboot.org/12691 for details.

-gerrit