[PATCH 2/3] drm/rockchip: Resolve dependency in GEM DMA helpers

[Jonas Karlman]

Hi Thomas,

On 2023-06-20 14:03, Thomas Zimmermann wrote:
> Remove the dependency on the GEM DMA helper library. Rockchip comes
> with its own implementation of the GEM interface. It only uses the VM
> callbacks in drm_gem_dma_vm_ops from the GEM DMA helpers. These are
> not DMA specific.
> 
> Duplicate drm_gem_dma_vm_ops in rockchip and remove all dependencies on
> the GEM DMA helper library.

I have intentions to remove the entire custom implementation of the GEM
interface and replace it with use of GEM DMA helpers in a future series.

Current custom implementation break import of video framebuffers located
in memory beyond 4GB. Switching to use pure GEM DMA helpers solved that
issue but requires reworking IOMMU integration for full support of
multiple VOPs on e.g., RK3288 and RK3399.

I have no ETA on when such series can be ready so this is more of a
heads up that I will revert this removal of dependency on GEM DMA helper
library in a future series.

Regards,
Jonas

> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
>  drivers/gpu/drm/rockchip/Kconfig            | 1 -
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +-
>  drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 8 ++++++--
>  3 files changed, 7 insertions(+), 4 deletions(-)
> 
[snip]