[PATCH] drm: renesas: rz-du: Support dmabuf import

[Kieran Bingham]

Hi Laurent,

Quoting Laurent Pinchart (2025-03-21 10:46:15)
> The rz-du driver uses GEM DMA helpers, but does not implement the
> drm_driver .gem_prime_import_sg_table operation. This  prevents
> importing dmabufs. Fix it by implementing the missing operation using
> the DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() helper macro.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> ---
> Kieran, would you be able to test this ?

Thanks! This patch fixes display for me on the RZ/V2H Kakip to render
images from the Raspberry Pi v3 camera (IMX708) directly on the
Raspberry Pi v2 7" Touch screen display.

Without this patch I get the following errors (reconfirmed now)


"Unable to import framebuffer dmabuf: Invalid argument"

And with this patch - I can stream directly to the display in RGB888
with the extra enablement from Lad Prabhakar for DSI.

Thanks,

Reviewed-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com> # RZ/V2H + DSI 

> ---
>  drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
> index cbd9b9841267..5e40f0c1e7b0 100644
> --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
> +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
> @@ -79,7 +79,7 @@ DEFINE_DRM_GEM_DMA_FOPS(rzg2l_du_fops);
>  
>  static const struct drm_driver rzg2l_du_driver = {
>         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> -       .dumb_create            = rzg2l_du_dumb_create,
> +       DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(rzg2l_du_dumb_create),
>         DRM_FBDEV_DMA_DRIVER_OPS,
>         .fops                   = &rzg2l_du_fops,
>         .name                   = "rzg2l-du",
> 
> base-commit: 9e75b6ef407fee5d4ed8021cd7ddd9d6a8f7b0e8
> -- 
> Regards,
> 
> Laurent Pinchart
>