Add support for the IN_FORMATS_ASYNC DRM property

[k2naveen]

This property lets the driver specify which format+modifier combinations are actually supported with tearing, and we use that in the dmabuf feedback to make tearing work in more cases (with sync fallback) - matching the approach taken in KWin.

[matte-schwartz]

Are there kernel patches necessary for this to work? I tried a few games (Hades II, Portal 2) on my MSI Claw and none seem to tear, even with this PR. The same in-game settings on AMD do tear.

[k2naveen]

Are there kernel patches necessary for this to work? I tried a few games (Hades II, Portal 2) on my MSI Claw and none seem to tear, even with this PR. The same in-game settings on AMD do tear.

Is there another way to test this using a standalone Gamescope binary? Currently, vkcube fails with the following logs::
$ MESA_VK_WSI_PRESENT_MODE=immediate GAMESCOPE_DEBUG=2 gamescope --backend drm --immediate-flips

$ vkcube --present_mode VK_PRESENT_MODE_IMMEDIATE_KHR
Present mode specified is not supported

[matte-schwartz]

I'll have to check locally, as usually I just use our standard gamescope-session setup on SteamOS for testing tearing.

[matte-schwartz]

@k2naveen i had a chance to look into this today, and it's not an issue with your patch.

we were missing a few upstream commits in our 6.18 kernel:

8d923853759e (HEAD -> matts/6.18/intel-backports) [FROM-UPSTREAM] drm/i915/psr: Allow async flip when Selective Fetch enabled
d79694c0e374 [FROM-UPSTREAM] drm/i915/psr: Perform full frame update on async flip
9cff40cca8ea [FROM-UPSTREAM] drm/i915/psr: Set plane id bit in crtc_state->async_flip_planes for PSR