Change in coreboot[master]: mb/google/brya: Disable C state auto demotion for Brya & Brask

[Subrata Banik (Code Review)]

Attention is currently required from: Vinay Kumar, Maulik V Vaghela, Tim Wawrzynczak.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62630 )

Change subject: mb/google/brya: Disable C state auto demotion for Brya & Brask
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Patch Set 6:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/62630/comment/fa357088_a2c3d849 
PS5, Line 13: disabling this feature results in 110 mW power savings
> Yes, no performance impact was seen with disabling autodemotion.

Isn't that surprising? if I go by the current observation from your side about no perf impact and good power savings by disabling the C-state auto demotion/promotion, then what is the usefulness of this feature. Ideally this feature would provide better energy conservation when enable.