Kevin Keijzer has posted comments on this change. ( https://review.coreboot.org/19090 )
Change subject: nb/intel/gm45: Allow setting backlight pwm frequency from CBFS ......................................................................
Patch Set 2: Code-Review+1
I would personally prefer the cbfs override to be present, because it seems like the easiest way to test a PWM value reliably prior to reporting the correct, tested value to be added to the whitelist. It's also a decent way to add an "unsupported" display without having to re-compile a ROM, or to work around degraded panels or weird inverters.