include/drm/drm_bridge.h

51 	 * @DRM_BRIDGE_ATTACH_NO_CONNECTOR: When this flag is set the bridge
64 	 * This callback is invoked whenever our bridge is being attached to a
74 	int (*attach)(struct drm_bridge *bridge,
80 	 * This callback is invoked whenever our bridge is being detached from a
85 	void (*detach)(struct drm_bridge *bridge);
91 	 * bridge. This should be implemented if the bridge has some sort of
92 	 * restriction in the modes it can display. For example, a given bridge
118 	enum drm_mode_status (*mode_valid)(struct drm_bridge *bridge,
128 	 * &drm_bridge. The parameter adjusted_mode is the input mode the bridge
132 	 * This is the only hook that allows a bridge to reject a modeset. If
151 	 * that modes are filtered consistently put any bridge constraints and
159 	bool (*mode_fixup)(struct drm_bridge *bridge,
165 	 * This callback should disable the bridge. It is called right before
167 	 * preceding element is a bridge this means it's called before that
168 	 * bridge's @disable vfunc. If the preceding element is a &drm_encoder
173 	 * The bridge can assume that the display pipe (i.e. clocks and timing
183 	void (*disable)(struct drm_bridge *bridge);
188 	 * This callback should disable the bridge. It is called right after the
190 	 * element is a bridge this means it's called after that bridge's
196 	 * The bridge must assume that the display pipe (i.e. clocks and timing
207 	void (*post_disable)(struct drm_bridge *bridge);
212 	 * This callback should set the given mode on the bridge. It is called
214 	 * pipeline has been called already. If the bridge is the first element
220 	 * first bridge in the chain. It can be different from the mode
222 	 * of the bridges chain, for instance when the first bridge in the chain
224 	 * bridge in the chain and is likely irrelevant for the other bridges.
235 	void (*mode_set)(struct drm_bridge *bridge,
241 	 * This callback should enable the bridge. It is called right before
243 	 * preceding element is a bridge this means it's called before that
244 	 * bridge's @pre_enable function. If the preceding element is a
249 	 * The display pipe (i.e. clocks and timing signals) feeding this bridge
250 	 * will not yet be running when this callback is called. The bridge must
251 	 * not enable the display link feeding the next bridge in the chain (if
261 	void (*pre_enable)(struct drm_bridge *bridge);
266 	 * This callback should enable the bridge. It is called right after
268 	 * preceding element is a bridge this means it's called after that
269 	 * bridge's @enable function. If the preceding element is a
274 	 * The bridge can assume that the display pipe (i.e. clocks and timing
276 	 * callback must enable the display link feeding the next bridge in the
286 	void (*enable)(struct drm_bridge *bridge);
291 	 * This callback should enable the bridge. It is called right before
293 	 * preceding element is a bridge this means it's called before that
294 	 * bridge's @atomic_pre_enable or @pre_enable function. If the preceding
298 	 * The display pipe (i.e. clocks and timing signals) feeding this bridge
299 	 * will not yet be running when this callback is called. The bridge must
300 	 * not enable the display link feeding the next bridge in the chain (if
305 	void (*atomic_pre_enable)(struct drm_bridge *bridge,
311 	 * This callback should enable the bridge. It is called right after
313 	 * preceding element is a bridge this means it's called after that
314 	 * bridge's @atomic_enable or @enable function. If the preceding element
318 	 * The bridge can assume that the display pipe (i.e. clocks and timing
320 	 * callback must enable the display link feeding the next bridge in the
325 	void (*atomic_enable)(struct drm_bridge *bridge,
330 	 * This callback should disable the bridge. It is called right before
332 	 * preceding element is a bridge this means it's called before that
333 	 * bridge's @atomic_disable or @disable vfunc. If the preceding element
337 	 * The bridge can assume that the display pipe (i.e. clocks and timing
342 	void (*atomic_disable)(struct drm_bridge *bridge,
348 	 * This callback should disable the bridge. It is called right after the
350 	 * element is a bridge this means it's called after that bridge's
355 	 * The bridge must assume that the display pipe (i.e. clocks and timing
361 	void (*atomic_post_disable)(struct drm_bridge *bridge,
367 	 * Duplicate the current bridge state object (which is guaranteed to be
370 	 * The atomic_duplicate_state hook is mandatory if the bridge
379 	struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge *bridge);
384 	 * Destroy a bridge state object previously allocated by
387 	 * The atomic_destroy_state hook is mandatory if the bridge implements
393 	void (*atomic_destroy_state)(struct drm_bridge *bridge,
399 	 * Return the supported bus formats on the output end of a bridge.
407 	 * This method is only called on the last element of the bridge chain
415 	u32 *(*atomic_get_output_bus_fmts)(struct drm_bridge *bridge,
424 	 * Return the supported bus formats on the input end of a bridge for
435 	 * This method is called on all elements of the bridge chain as part of
439 	 * bus format negotiation on this element of the bridge without
449 	 * Note: Even if input format selection on the first bridge has no
455 	u32 *(*atomic_get_input_bus_fmts)(struct drm_bridge *bridge,
465 	 * This method is responsible for checking bridge state correctness.
470 	 * order (from the last to the first bridge).
479 	 * field is set to the next bridge
481 	 * &drm_connector.display_info.bus_flags if the bridge is the last
487 	int (*atomic_check)(struct drm_bridge *bridge,
495 	 * Reset the bridge to a predefined state (or retrieve its current
499 	 * The atomic_reset hook is mandatory if the bridge implements any of
508 	 * 1. The reset operation happens when the bridge is attached, not when
517 	struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge);
522 	 * Check if anything is attached to the bridge output.
524 	 * This callback is optional, if not implemented the bridge will be
531 	 * drm_connector_status indicating the bridge output status.
533 	enum drm_connector_status (*detect)(struct drm_bridge *bridge);
550 	 * filling modes, and shall not be stored internally by bridge drivers
557 	int (*get_modes)(struct drm_bridge *bridge,
566 	 * information for a display connected to the bridge output. Bridges
578 	 * retrieval, and shall not be stored internally by bridge drivers for
588 	const struct drm_edid *(*edid_read)(struct drm_bridge *bridge,
594 	 * Notify the bridge of hot plug detection.
601 	void (*hpd_notify)(struct drm_bridge *bridge,
607 	 * Enable hot plug detection. From now on the bridge shall call
617 	void (*hpd_enable)(struct drm_bridge *bridge);
622 	 * Disable hot plug detection. Once this function returns the bridge
631 	void (*hpd_disable)(struct drm_bridge *bridge);
636 	 * Allows bridges to create bridge-specific debugfs files.
638 	void (*debugfs_init)(struct drm_bridge *bridge, struct dentry *root);
642  * struct drm_bridge_timings - timing information for the bridge
649 	 * this bridge requires (like pixel signal polarity). See also
663 	 * Defines the time in picoseconds taken for the bridge to sample the
678  * enum drm_bridge_ops - Bitmask of operations supported by the bridge
682 	 * @DRM_BRIDGE_OP_DETECT: The bridge can detect displays connected to
688 	 * @DRM_BRIDGE_OP_EDID: The bridge can retrieve the EDID of the display
694 	 * @DRM_BRIDGE_OP_HPD: The bridge can detect hot-plug and hot-unplug
702 	 * @DRM_BRIDGE_OP_MODES: The bridge can retrieve the modes supported
711  * struct drm_bridge - central DRM bridge control structure
716 	/** @dev: DRM device this bridge belongs to */
718 	/** @encoder: encoder to which this bridge is connected */
720 	/** @chain_node: used to form a bridge chain */
722 	/** @of_node: device node pointer to the bridge */
729 	 * the timing specification for the bridge, if any (may be NULL)
734 	/** @driver_private: pointer to the bridge driver's internal context */
736 	/** @ops: bitmask of operations supported by the bridge */
739 	 * @type: Type of the connection at the bridge output
745 	 * @interlace_allowed: Indicate that the bridge can handle interlaced
750 	 * @pre_enable_prev_first: The bridge requires that the prev
751 	 * bridge @pre_enable function is called before its @pre_enable,
784 void drm_bridge_add(struct drm_bridge *bridge);
785 int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge);
786 void drm_bridge_remove(struct drm_bridge *bridge);
787 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
801  * drm_bridge_get_next_bridge() - Get the next bridge in the chain
802  * @bridge: bridge object
805  * the next bridge in the chain after @bridge, or NULL if @bridge is the last.
808 drm_bridge_get_next_bridge(struct drm_bridge *bridge)
810 	if (list_is_last(&bridge->chain_node, &bridge->encoder->bridge_chain))
813 	return list_next_entry(bridge, chain_node);
817  * drm_bridge_get_prev_bridge() - Get the previous bridge in the chain
818  * @bridge: bridge object
821  * the previous bridge in the chain, or NULL if @bridge is the first.
824 drm_bridge_get_prev_bridge(struct drm_bridge *bridge)
826 	if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
829 	return list_prev_entry(bridge, chain_node);
833  * drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain
837  * the first bridge in the chain, or NULL if @encoder has no bridge attached
850  * @bridge: a bridge pointer updated to point to the current bridge at each
853  * Iterate over all bridges present in the bridge chain attached to @encoder.
855 #define drm_for_each_bridge_in_chain(encoder, bridge)			\
856 	list_for_each_entry(bridge, &(encoder)->bridge_chain, chain_node)
858 bool drm_bridge_chain_mode_fixup(struct drm_bridge *bridge,
862 drm_bridge_chain_mode_valid(struct drm_bridge *bridge,
865 void drm_bridge_chain_mode_set(struct drm_bridge *bridge,
869 int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
872 void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge,
874 void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge,
876 void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
878 void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
882 drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge,
889 enum drm_connector_status drm_bridge_detect(struct drm_bridge *bridge);
890 int drm_bridge_get_modes(struct drm_bridge *bridge,
892 const struct drm_edid *drm_bridge_edid_read(struct drm_bridge *bridge,
894 void drm_bridge_hpd_enable(struct drm_bridge *bridge,
898 void drm_bridge_hpd_disable(struct drm_bridge *bridge);
899 void drm_bridge_hpd_notify(struct drm_bridge *bridge,
903 bool drm_bridge_is_panel(const struct drm_bridge *bridge);
907 void drm_panel_bridge_remove(struct drm_bridge *bridge);
909 				     struct drm_bridge *bridge);
917 struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge);
919 static inline bool drm_bridge_is_panel(const struct drm_bridge *bridge)
925 						   struct drm_bridge *bridge)