[Freedreno] Whether A200 driver is supported by Linux Mainline Kernel

[abhijit]

Hi Wladimir,

Thank you very much for the reply.

I am able to build the kernel, drm and mesa components.

After loading the kernel, I am getting following entries,
	/dev/gsl_kmod
	/dev/dri/card0
	/dev/dri/renderD128

Can you please let me know what are the test application that be used to 
test the driver through gsl_kmod interface?

Now to test the driver, I am running kmscube, which is giving exception,
   "@MF@ using DRM kernel interface
    @MF@ fd_device_del refcnt=1
    @MF@ fd_device_del_impl
    @MF@ fd_cleanup_bo_cache devtime=0 time=0 num_buckets=55
    Segmentation fault"

Can freedreno test be used with gsl_kmod interface, I am simultaneously 
trying build freedreno tests?

I have allocated 9MB of memory to "memchunk" in 
drivers/mxc/amd-gpu/platform/hal/linux/gsl_hal.c as, dma_alloc_coherent 
is failing for 72MB

Regards,
    Abhijit

On Monday 07 August 2017 04:59 PM, Wladimir wrote:
>> I guess that it is failing to find the old kgsl shim drm driver, which
>> enabled allocation of GEM buffers for pixmaps.  I know Wladimir played
>> a bit with this on imx5, but I think he was just using gbm/kms and not
>> x11.  I guess he was using imx-drm for GEM buffer allocation?
>
> Yes, for the a20x stuff I use the old GSL kernel driver
> (forward-ported to 4.12, see
> https://github.com/laanwj/linux-freedreno-a2xx).
> This creates a /dev/gsl_kmod, which has an interface different from
> the "newer" kgsl.
>
> And a mesa and libdrm that is patched to use this:
>
> https://github.com/laanwj/mesa-freedreno-a2xx
> https://github.com/laanwj/libdrm-freedreno-a20x
>
> This fork of mesa doesn't support X11, only kms/gbm-based rendering.
> All of this is very experimental.
>
> Regards,
> Wladimir
>