[agl-discussions] Next steps on OpenCL support for the H3

[Martin Kelly]

Hi,

As you know, I recently submitted patches for enabling OpenCL support on 
the Renesas H3 and Salvator-X boards [1]. Kurokawa-san had concerns 
about using the OpenCL drivers in the same package as the current 
gles-user-module and says that Renesas can support only the existing 
GLES drivers [2]. I would like to drive consensus on the right way to 
handle the packaging here so that we can get OpenCL support added into 
the H3. Since the H3 has a very capable GPU, it's an immensely useful 
feature.

I think the central question is about the differences between the 
Renesas OpenCL drivers and the existing GLES drivers [3]. It appears 
these drivers are released at different cadences, such that the GLES 
drivers have Yocto 3.40 support but the OpenCL drivers do not. In 
addition, it appears that the OpenCL drivers replace the GLES drivers, 
as they provide both an OpenCL and a GLES stack. For this reason, using 
both may create issues, and it's not clear whether it's safe to mix and 
match the GLES with the OpenCL drivers, or if they are mutually exclusive.

Kurokawa-san or others at Renesas: What is the recommended way to use 
the OpenCL drivers on the H3 with AGL? In other words, how should I 
change the OpenCL patches so we can get OpenCL supported officially in 
AGL :) ? I am happy to adapt my patches to make this work but am unsure 
about the best way to do it, since the driver code is proprietary.

Thanks,
Martin

[1]
https://gerrit.automotivelinux.org/gerrit/#/c/13375/
https://gerrit.automotivelinux.org/gerrit/#/c/13377/
https://gerrit.automotivelinux.org/gerrit/#/c/13379/
https://gerrit.automotivelinux.org/gerrit/#/c/13381/

[2]
https://gerrit.automotivelinux.org/gerrit/#/c/13375/

[3]
Existing GLES drivers:
https://www.renesas.com/en-eu/solutions/automotive/rcar-demoboard.html

OpenCL drivers:
https://www.renesas.com/en-us/solutions/automotive/rcar-opencl.html