| Message ID | 20190826152649.13820-16-boris.brezillon@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm: Add support for bus-format negotiation | expand |
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); >
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);
Will be useful for bridge drivers that want to do bus format negotiation with their neighbours. 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(+)