[PATCH 0/4] drm/pl111: RealView and Versatile Express

[Linus Walleij]

On Fri, Mar 2, 2018 at 1:11 PM, Robin Murphy <robin.murphy at arm.com> wrote:
> On 02/03/18 09:09, Linus Walleij wrote:

>> Also the Versatile Express CLCD on the motherboard has
>> a dedicated video memory, and cannot use CMA (ha! complex!)
>> and I will need to figure out a way to work around that.
>> The CLCDs synthesized on the core tiles for CA9 work
>> fine with this though.
>
> Out of curiosity, what's the issue with declaring the VRAM as a CMA region?
> That's certainly worked for stuff like local RAM on FPGA tiles in the past,
> and I can't think offhand of any way in which VExpress is wildly different
> (but I am of course open to being wrong...)

There is nothing wrong with that apart from my ignorance
of that solution. So thanks! :D

My experience with CMA is limited to using the 7 areas
that are defined by default in Kconfig and the DRM helpers
just plugging in on the front.

Do you have some pointers? Is this something I can
handily just set up in the device tree?

Yours,
Linus Walleij