Some they say that these processors have in-built spy feature for Chinese govt. and this is the reason to have only vendor kernels.
Come on, if people could have more critical thinking, the world wouldn’t be as absurd as it has been in recent years.
In short, vendor kernels are produced by Rockchip to pursue short-term commercial interests, and avoid spending time upstreaming every patch. They have not learned much from the open source community.
As for CIX, they have already started submitting it upstream. A young company may not be as experienced as an old one, but it may also not be as stubborn and conservative.