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Otherwise there is a flurry of TDP changes with suspend/resume
as the kernel powers devices off on suspend and brings them
back online in resume.
This also adds a mutex around the TDP operations since it is
split across two methods and can't just rely on being Serialized.
Change-Id: I7757d3ddad34ac985a9c8ce2fc202e2b2dcb2527
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1348
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
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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@chromium.org>
Reviewed-on: http://review.coreboot.org/1344
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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Change-Id: I06228ecf9cac931ad34e32871d5a4f2a4857b2ac
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/854
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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