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

[abhijit]

Hi Wladimir,

Thank you very much for your help.

I am able to run kmscube application and able to notice substantial 
difference b/w H/W and S/W rendering.

I also changed freedreno test-cube.c application with GBM interface and 
it also worked fine.

Regards,
    Abhijit

On Thursday 10 August 2017 07:59 PM, Wladimir J. van der Laan wrote:
> Hello Abhijit,
>
> On Thu, Aug 10, 2017 at 07:45:03PM +0530, abhijit wrote:
>> 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
>>
>
> That's expected. gsl_kmod is for the GPU, card0/renderD128 is the
> i.mx5x IPU/scanout.
>
>> Can you please let me know what are the test application that be used to
>> test the driver through gsl_kmod interface?
>
> Anything using kms/gbm should work.
>
>> 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"
>
> you need:
> export FD_DRM_USE_KGSL=1
>
>> Can freedreno test be used with gsl_kmod interface, I am simultaneously
>> trying build freedreno tests?
>
> I don't know. Might well be that they depend on a msm interface to the kernel.
>
>> 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
>
> I set CONFIG_CMA_SIZE_MBYTES=128 to avoid that issue.
> 9MB of video memory is not enough, in any case.
> and mmu is currently forced to disabled in the amdgpu driver as it resulted in crashes.
> (this is something that broke during forward-porting it from the 2.x to 3.x kernel, unfortunately)
>
> Regards,
> Wladimir
>