Implement Intel Battery Power Optimizer

[mkopec]

The problem you're addressing (if any)

The power limit implementation in EC does not take into account that the battery may have a different max discharge rate depending on charge level.

Describe the solution you'd like

Check if the battery supports BPO v2 first (depends on fuel gauge and its firmware)

Implement full support for Intel BPO v2 battery fuel gauges, which report max peak power (10ms window, PL4), sustained peak power (10s window, PL2) and other related values over SMBus.

Where is the value to a user, and who might that user be?

Better stability, no sudden shutdowns when starting a compilation job while on battery power (happens to me quite often on NV4x)

Describe alternatives you've considered

No response

Additional context

References:

• Intel PDPM Design Guide, #644413
• Intel BPO v2 SMBus Implementation Specification, #575674