Comment 45 for bug 1784485

It's already done like mohamed badaoui said: http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/142572.html

Linux kernel is a big project, it can takes months to accept it.
We use mailing list rather than PR request.

If you don't want to wait, you can compile it by yourself following my previous message.