drm: rcar-du: Make sure the VSP is initialized on platforms that need it
On Gen3 platforms planes are managed by the external VSP compositor on behalf of DRM/KMS. If VSP compositor support is not enabled in the DU driver, the VSP initialization stub routine is called. Return an error from that stub to fail explicitly, otherwise the device won't be usable and the driver will crash. Signed-off-by:Jacopo Mondi <jacopo+renesas@jmondi.org> Reviewed-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> [Clarified commit message] Signed-off-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
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a8fd1223
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