On 26/08/2019 17:26, Boris Brezillon wrote:
> Will be useful for bridge drivers that want to do bus format
> negotiation with their neighbours.
Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> ---
> Changes in v2:
> * Fix the kerneldoc
> * Drop the !bridge || !bridge->encoder check
> ---
> drivers/gpu/drm/drm_bridge.c | 17 +++++++++++++++++
> include/drm/drm_bridge.h | 2 ++
> 2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 7f7e0ea5b06c..9c74b285da9d 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -238,6 +238,23 @@ drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge)
> }
> EXPORT_SYMBOL(drm_bridge_chain_get_next_bridge);
>
> +/**
> + * 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 last.
> + */
> +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);
> +}
> +EXPORT_SYMBOL(drm_bridge_chain_get_prev_bridge);
> +
> /**
> * DOC: bridge callbacks
> *
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 7fdce6dc5f26..95dc58c3a4e8 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -521,6 +521,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
>
> struct drm_bridge *
> drm_bridge_chain_get_next_bridge(struct drm_bridge *bridge);
> +struct drm_bridge *
> +drm_bridge_chain_get_prev_bridge(struct drm_bridge *bridge);
> bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
> const struct drm_display_mode *mode,
> struct drm_display_mode *adjusted_mode);
>
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