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authorArthur Heymans <arthur@aheymans.xyz>2016-05-19 16:02:38 +0200
committerMartin Roth <martinroth@google.com>2016-10-11 23:34:18 +0200
commite1f0ac4baa1bbe561276bee8ebc20fe86b0f8cc2 (patch)
tree0529f2a7fcc717de4ce1707bea9626c9f32cd66e /src/include/bootmem.h
parent49a7c37de95531eb2f8037542806ec56240388be (diff)
lenovo/x60: CST table: use MWAIT requests instead of P_LVLx I/O reads
Requesting low power acpi cpu c-states has two software interfaces: Using P_LVLx I/O reads or using equivalent MWAIT requests. This change makes it more consistent with newer targets that use MWAIT requests. There also exists extended intel acpi c-states which can be enabled in two ways: - using a substate hint to the mwait request (defined in bios); - setting a model specific register (msr) Currently this is done by setting the right msr bits but with this change one can experiment by adding substate hints. Change-Id: I9eeb5b008e2ddc2193725667f2c13582a4877e3c Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/14801 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
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