[PATCH v22 21/24] drm/mediatek: add dma dev get function

[Rex-BC Chen]

On Thu, 2022-05-26 at 19:02 +0800, Nancy.Lin wrote:
> This is a preparation for adding support for the ovl_adaptor sub
> driver
> Ovl_adaptor is a DRM sub driver, which doesn't have dma dev. Add
> dma_dev_get function for getting representative dma dev in
> ovl_adaptor.
> 
> Signed-off-by: Nancy.Lin <nancy.lin at mediatek.com>
> Reviewed-by: AngeloGioachino Del Regno <
> angelogioacchino.delregno at collabora.com>
> Reviewed-by: CK Hu <ck.hu at mediatek.com>
> Tested-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno at collabora.com>
> ---
> 

[Bo-Chen: Test on MT8195 Tomato Chromebook with external display]
Tested-by: Bo-Chen Chen <rex-bc.chen at mediatek.com>