[PATCH xf86-video-amdgpu 0/6] xf86-video-amdgpu integration for DRM variable refresh rate API

[Michel Dänzer]

Hi Nicholas,


thanks for the patches.


On 2018-09-11 6:18 p.m., Nicholas Kazlauskas wrote:
> These patches are part of a proposed new interface for supporting variable refresh rate via DRM properties.
> 
> https://patchwork.freedesktop.org/series/49486/
> 
> When notified of a window that is FreeSync capable via X these patches help track when the window is fullscreen to manage the variable_refresh property on the CRTC.

I'm afraid the Xorg driver support will have to be more or less redone
from scratch for upstreaming:

Whether or not a client wants variable refresh rate enabled can be
tracked via the window property mechanism supported by the core X11
protocol, no need for a protocol extension.

That should also allow simpler tracking of when variable refresh rate
can actually be enabled: It can be enabled while a window is flipping,
and its corresponding property allows it. This should be straightforward
with the Present extension, because that also explicitly marks the end
of a window flipping (via an "unflip"). DRI2 is trickier; it's probably
okay not to support variable refresh rate with that, at least initially.


I can look into this after the upcoming Xorg driver 18.1 releases. Or I
can give guidance if one of you wants to look into it.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer