[yocto] [meta-raspberrypi][PATCH 5/5] rpi-default-providers: Switch providers according to used gfx stack

[Javier Martinez Canillas]

Hello Andreas,

Thanks a lot for your feedback.

On 08/06/2015 09:41 AM, Andreas Müller wrote:
> On Thu, Aug 6, 2015 at 8:59 AM, Javier Martinez Canillas
> <javier at osg.samsung.com> wrote:
>> Yes, I in fact was not sure if it should be a distro or machine feature
>> and then decided on the former because there is more than the kernel to
>> make it work like changing mesa configure options. But as mentioned to
>> Andrea Müller, probably we should ship a mesa .bbappend for this in the
>> BSP so I agree that a MACHINE_FEATURE will make more sense.
> Suggestions:
> 
> * Mesa: A simple append with
> 
> PACKAGECONFIG_append_rpi += " gallium"
> GALLIUMDRIVERS_rpi = "vc4"
> 
> would do. If you check mesa.inc in oe-core others (intel) do similar

That sounds good to me.

> (we might have to wait for a more recent mesa expected in September).
>

Why do you think we would have to wait for a newer mesa? AFAICT the mesa
version in Fido (10.4.4) already has vc4 support [0]. Although we have
been using mesa master so I should test how well 10.4 works. AFAIK Derek
picked a specific mesa sha1 that Eric's vc4 DRM driver was known to work.

But if there is a meta-raspberrypi/recipes-graphics/mesa/mesa_%.bbappend
then we can use a newer mesa in tizen-distro without the need of having
patches on top of meta-raspberrypi as we do now.
 
> * kernel: have different name e.g linux-raspberrypi-vc4
>

Yes, that seems to be what most people agree on. I'll change it in v2.

> The selection is done in this layer by changing default providers. In
> a first step this could be done manually - aided by a helpful comment.
>

Agreed.

> Andreas
>

[0]: http://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/vc4?h=10.4

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America