On 23/10/2019 17:45, Boris Brezillon wrote:
> Will be useful for bridge drivers that want to do bus format
> negotiation with their neighbours.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> ---
> Changes in v3:
> * Inline drm_bridge_chain_get_prev_bridge()
> * Fix the doc
>
> Changes in v2:
> * Fix the kerneldoc
> * Drop the !bridge || !bridge->encoder check
> ---
> include/drm/drm_bridge.h | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 2beb1ef9a733..3fb518494640 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -526,6 +526,22 @@ drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge)
> return list_next_entry(bridge, chain_node);
> }
>
> +/**
> + * drm_bridge_chain_get_prev_bridge() - Get the previous bridge in the chain
> + * @bridge: bridge object
> + *
> + * RETURNS:
> + * the previous bridge in the chain, or NULL if @bridge is the first.
> + */
> +static inline struct drm_bridge *
> +drm_bridge_chain_get_prev_bridge(struct drm_bridge *bridge)
> +{
> + if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
> + return NULL;
> +
> + return list_prev_entry(bridge, chain_node);
> +}
> +
> /**
> * drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain
> * @encoder: encoder object
>
Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
