kernel/drivers/gpu/drm/vc4/vc4_fence.c, branch linux-4.17.yHosts the 0x221E linux distro kernel.https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-4.17.y2017-04-13T18:00:28Zdrm/vc4: Expose dma-buf fences for V3D rendering.2017-04-13T18:00:28ZEric Anholteric@anholt.net2017-04-12T19:12:02Zurn:sha1:cdec4d3613230fc15723fae206cb17825b914cee
This is needed for proper synchronization with display on another DRM
device (pl111 or tinydrm) with buffers produced by vc4 V3D. Fixes the
new igt vc4_dmabuf_poll testcase, and rendering of one of the glmark2
desktop tests on pl111+vc4.
This doesn't yet introduce waits on another device's fences before
vc4's rendering/display, because I don't have testcases for them.
v2: Reuse dma_fence_free(), retitle commit message to clarify that
it's not a full dma-buf fencing implementation yet.
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170412191202.22740-6-eric@anholt.net
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>