tree 83bc2c85c49be6c2327a6bb0764306eb4ce844e3
parent 2ad03a43ecf0c97634f27ebcc2132b8e4286ceb3
author Angel Pons <th3fanbus@gmail.com> 1605783727 +0100
committer Patrick Georgi <pgeorgi@google.com> 1606083198 +0000

nb/intel/sandybridge: Refine power-down mode logic

When memory is running at fast frequencies, power-down modes can lessen
system stability. Check tXP and tXPDLL values and use safer power down
modes if their values are high. Do not use APD with DLL-off on mobile:
vendor firmware does not use it, and it can influence system stability.

Change-Id: Ic8e98162ca86ae454a8c951be163d58960940e0e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47746
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>