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SubjectRe: [PATCH 3/3] drm/vc4: Add support for dma-buf fencing.
Daniel Vetter <> writes:

> On Mon, Apr 10, 2017 at 06:44:14PM -0700, Eric Anholt wrote:
>> 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 other device's fences before vc4's
>> rendering/display, because I don't have testcases for them.
>> Signed-off-by: Eric Anholt <>
>> Cc: Gustavo Padovan <>
> So not sure I didn't look hard enough or why exactly, but I didn't find
> anything like ->prepare_fb as implemented in e.g. drm_fb_cma_prepare_fb().
> Where is that? Otherwise looks good to me.

Yeah, I need to sort that out for vc4 as a consumer of busy buffers
still. This patch just does vc4 as the producer.
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