[RFC PATCH 0/7] drm/panfrost: Add a new submit ioctl

[Alyssa Rosenzweig]

> >  3. Each VkCommandBuffer is two command buffers: one for compute and
> > one for binning, and you use some sort of HW synchronization mechanism
> > to handle the dependencies as you ping-pong between them.
> 
> I didn't consider that option. We have a DOORBELL instruction on Bifrost
> to wake up the CPU when the GPU wants to report something (not even
> sure we have something equivalent on Midgard), but there's no
> inter-queue sync mechanism AFAICT.

I was about to say that we don't have hardware support. Even considering
DOORBELL (which AFAIK isn't piped through to anything on kbase at
least), I'm inclined to say we don't have hardware support. Option 2
(what kbase does? dunno how DDK vulkan works though) is probably our
best bet, tbh.