Small correction: the amdgpu driver has been integrated and working in the upstream Linux kernel for many years now.
The one chink recently was the new display code, which was a requirement for Vega (but not for earlier generations), and which was a genuine open sourcing of an existing, Windows-focused code base. That process took longer than one might hope for, but we're clearly over the hump now with it going upstream.
The one chink recently was the new display code, which was a requirement for Vega (but not for earlier generations), and which was a genuine open sourcing of an existing, Windows-focused code base. That process took longer than one might hope for, but we're clearly over the hump now with it going upstream.