Hi,
On Mon, Jan 06, 2020 at 03:34:06PM +0100, Neil Armstrong wrote:
> From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
>
> One of the last remaining objects to not have its atomic state.
>
> This is being motivated by our attempt to support runtime bus-format
> negotiation between elements of the bridge chain.
> This patch just paves the road for such a feature by adding a new
> drm_bridge_state object inheriting from drm_private_obj so we can
> re-use some of the existing state initialization/tracking logic.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> ---
> [...]
> +
> +/**
> + * __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
> + * @bridge: bridge object
> + * @state: atomic bridge state
> + *
> + * Copies atomic state from a bridge's current state and resets inferred values.
> + * This is useful for drivers that subclass the bridge state.
> + */
> +void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
> + struct drm_bridge_state *state)
> +{
> + __drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
> + &state->base);
When DRM and DRM_KMS_HELPER are built as modules the above will cause the
following build error:
depmod: ERROR: Cycle detected: drm_kms_helper -> drm -> drm_kms_helper
depmod: ERROR: Found 2 modules in dependency cycles!
Using __drm_atomic_helper_private_obj_duplicate_state will add the
drm.ko->drm_kms_helper.ko dependency but drm_kms_helper.ko already
depends on drm.ko
--Imre
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