Supporting modern smartphones on mainline Linux is getting easier by the year; it's now possible to get a lot of hardware working with fairly minimal effort or issues.

But what do we do for the parts which are not easy, the bits where you as a developer get stuck? Users of mobile phones expect everything to work, but the closer we get to that the more issues become apparent which are not just missing feature bringup.

We've managed to get 80% of the way, so let's talk about what's missing to get the remaining 20% to work and actually make phones mostly feature complete from a kernel perspective.