[Letux-kernel] Lay common foundation to make PVR/SGX work without hacks on OMAP34xx, OMAP36xx, AM335x and potentially OMAP4, OMAP5

[Tomi Valkeinen]

On 23/01/18 19:56, Tony Lindgren wrote:

> We really need some coordinated effort to get the driver kernel parts
> to usable state though. And considering the number of people involved
> I think staging is the best place to do it. Then what happens after that
> is of course up in the air as always. In the worst case it will get just
> dropped lik the TI dsp stuff based on zero effort :)

Yes, I have nothing against the idea. My fear is that it'll be difficult
to have a single SGX kernel driver which works for all the SGX userspace
binaries. As the kernel and userspace parts are always shipped as a
pair, my guess is that there has never been any attempt to keep the UAPI
stable. But I'm basing my guess on no actual knowledge, so I'm happy to
be proven wrong =).

> And there finally seems to some effort going on by the chromeos guys.
> 
> FYI again if it was not mentioned earlier, here's the thread for
> upstreaming Roque support?
> 
> "[POC 00/16] Chromebook R13 GPU driver port":
> 
> https://lists.freedesktop.org/archives/dri-devel/2017-November/157737.html
> 
> No idea how much of that will be usable for SGX though.

If I understood right, it's not about upstreaming. It was about getting
the Rogue userspace binaries work on top of mainline, i.e. porting the
kernel driver on top of mainline.

And, again, my understanding of the "DRM philosophy" is that having
kernel drivers like these is explicitly forbidden in the mainline. Which
is why e.g. there's no nvidia kernel driver.

 Tomi

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