On Friday, July 14, 2017 7:38:01 AM PDT Lucas Stach wrote:
> While this is no build dependency, etnaviv will only work correctly on most
> systems if CMA and DMA_CMA are enabled. Select both options if available to
> avoid users ending up with a non-working GPU due to a lacking kernel config.
> 
> Signed-off-by: Lucas Stach <[email protected]>
> ---
>  drivers/gpu/drm/etnaviv/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/etnaviv/Kconfig
> b/drivers/gpu/drm/etnaviv/Kconfig index 71cee4e9fefb..38b477b5fbf9 100644
> --- a/drivers/gpu/drm/etnaviv/Kconfig
> +++ b/drivers/gpu/drm/etnaviv/Kconfig
> @@ -10,6 +10,8 @@ config DRM_ETNAVIV
>       select IOMMU_API
>       select IOMMU_SUPPORT
>       select WANT_DEV_COREDUMP
> +     select CMA if HAVE_DMA_CONTIGUOUS
> +     select DMA_CMA if HAVE_DMA_CONTIGUOUS
>       help
>         DRM driver for Vivante GPUs.
IIRC, This at least half solves it.
Does the user of systems with > 2 GiB  need to explicitly specify cma size for 
it to work?

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