https://bugs.freedesktop.org/show_bug.cgi?id=73378
--- Comment #35 from Alex Deucher alexdeucher@gmail.com --- (In reply to Chernovsky Oleg from comment #34)
Is this some kind of open hardware docs? Or just internal? Maybe I missed something
Just internal.
(In reply to Chernovsky Oleg from comment #33)
P.S. I only fear that maybe I launched mmiotrace too late, I did rmmod and then modprobe fglrx again. Could it setup any registers at the first run? Because at second it touched UVD only when I launched mpv.
To save power the UVD clocks are only raised when it's actually in use. I think fglrx does some low level hw init similar to what we do in radeon, but they don't do a ring test so they probably don't change the UVD plls at driver load time only when UVD is in use (although I'm not 100% sure off hand).