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@baylibre.com
Signed-off-by: Boris Brezillon boris.brezillon@collabora.com
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);