37  * &struct drm_bridge represents a device that hangs on to an encoder. These are
39  * encoder chain.
44  *     [ CRTC ---> ] Encoder ---> Bridge A ---> Bridge B
46  * Here, the output of the encoder feeds to bridge A, and that furthers feeds to
56  * attached to the encoder with a call to drm_bridge_attach().
62  * Once these links are created, the bridges can participate along with encoder
91  * encoder chain.
153  * drm_bridge_attach - attach the bridge to an encoder's chain
155  * @encoder: DRM encoder
160  * Called by a kms driver to link the bridge to an encoder's chain. The previous
162  * linked directly at the encoder's output. Otherwise it is linked at the
168  * Note that bridges attached to encoders are auto-detached during encoder
175 int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,  in drm_bridge_attach()  argument
181 	if (!encoder || !bridge)  in drm_bridge_attach()
184 	if (previous && (!previous->dev || previous->encoder != encoder))  in drm_bridge_attach()
190 	bridge->dev = encoder->dev;  in drm_bridge_attach()
191 	bridge->encoder = encoder;  in drm_bridge_attach()
196 		list_add(&bridge->chain_node, &encoder->bridge_chain);  in drm_bridge_attach()
226 	bridge->encoder = NULL;  in drm_bridge_attach()
258  * - The encoder-related operations support control of the bridges in the
284  *   encoder-related operations. This feature is not supported by the legacy
341  *				 encoder chain
347  * encoder chain, starting from the first bridge to the last.
349  * Note: the bridge passed should be the one closest to the encoder
358 	struct drm_encoder *encoder;  in drm_bridge_chain_mode_fixup()  local
363 	encoder = bridge->encoder;  in drm_bridge_chain_mode_fixup()
364 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_mode_fixup()
378  *				 encoder chain.
383  * Calls &drm_bridge_funcs.mode_valid for all the bridges in the encoder
387  * Note: the bridge passed should be the one closest to the encoder.
397 	struct drm_encoder *encoder;  in drm_bridge_chain_mode_valid()  local
402 	encoder = bridge->encoder;  in drm_bridge_chain_mode_valid()
403 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_mode_valid()
419  * drm_bridge_chain_disable - disables all bridges in the encoder chain
422  * Calls &drm_bridge_funcs.disable op for all the bridges in the encoder
424  * calling the encoder's prepare op.
426  * Note: the bridge passed should be the one closest to the encoder
430 	struct drm_encoder *encoder;  in drm_bridge_chain_disable()  local
436 	encoder = bridge->encoder;  in drm_bridge_chain_disable()
437 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_disable()
449  *				   encoder chain
453  * encoder chain, starting from the first bridge to the last. These are called
454  * after completing the encoder's prepare op.
456  * Note: the bridge passed should be the one closest to the encoder
460 	struct drm_encoder *encoder;  in drm_bridge_chain_post_disable()  local
465 	encoder = bridge->encoder;  in drm_bridge_chain_post_disable()
466 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_post_disable()
475  *			       encoder chain
477  * @mode: desired mode to be set for the encoder chain
478  * @adjusted_mode: updated mode that works for this encoder chain
481  * encoder chain, starting from the first bridge to the last.
483  * Note: the bridge passed should be the one closest to the encoder
489 	struct drm_encoder *encoder;  in drm_bridge_chain_mode_set()  local
494 	encoder = bridge->encoder;  in drm_bridge_chain_mode_set()
495 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_mode_set()
504  *				 encoder chain
507  * Calls &drm_bridge_funcs.pre_enable op for all the bridges in the encoder
509  * before calling the encoder's commit op.
511  * Note: the bridge passed should be the one closest to the encoder
515 	struct drm_encoder *encoder;  in drm_bridge_chain_pre_enable()  local
521 	encoder = bridge->encoder;  in drm_bridge_chain_pre_enable()
522 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_pre_enable()
530  * drm_bridge_chain_enable - enables all bridges in the encoder chain
533  * Calls &drm_bridge_funcs.enable op for all the bridges in the encoder
535  * after completing the encoder's commit op.
537  * Note that the bridge passed should be the one closest to the encoder
541 	struct drm_encoder *encoder;  in drm_bridge_chain_enable()  local
546 	encoder = bridge->encoder;  in drm_bridge_chain_enable()
547 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_bridge_chain_enable()
555  * drm_atomic_bridge_chain_disable - disables all bridges in the encoder chain
560  * &drm_bridge_funcs.disable) op for all the bridges in the encoder chain,
564  * Note: the bridge passed should be the one closest to the encoder
569 	struct drm_encoder *encoder;  in drm_atomic_bridge_chain_disable()  local
575 	encoder = bridge->encoder;  in drm_atomic_bridge_chain_disable()
576 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {  in drm_atomic_bridge_chain_disable()
599  *					  in the encoder chain
604  * &drm_bridge_funcs.post_disable) op for all the bridges in the encoder chain,
608  * Note: the bridge passed should be the one closest to the encoder
613 	struct drm_encoder *encoder;  in drm_atomic_bridge_chain_post_disable()  local
618 	encoder = bridge->encoder;  in drm_atomic_bridge_chain_post_disable()
619 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_atomic_bridge_chain_post_disable()
640  *					the encoder chain
645  * &drm_bridge_funcs.pre_enable) op for all the bridges in the encoder chain,
649  * Note: the bridge passed should be the one closest to the encoder
654 	struct drm_encoder *encoder;  in drm_atomic_bridge_chain_pre_enable()  local
660 	encoder = bridge->encoder;  in drm_atomic_bridge_chain_pre_enable()
661 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {  in drm_atomic_bridge_chain_pre_enable()
683  * drm_atomic_bridge_chain_enable - enables all bridges in the encoder chain
688  * &drm_bridge_funcs.enable) op for all the bridges in the encoder chain,
692  * Note: the bridge passed should be the one closest to the encoder
697 	struct drm_encoder *encoder;  in drm_atomic_bridge_chain_enable()  local
702 	encoder = bridge->encoder;  in drm_atomic_bridge_chain_enable()
703 	list_for_each_entry_from(bridge, &encoder->bridge_chain, chain_node) {  in drm_atomic_bridge_chain_enable()
873 	struct drm_encoder *encoder = bridge->encoder;  in drm_atomic_bridge_chain_select_bus_fmts()  local
880 	last_bridge = list_last_entry(&encoder->bridge_chain,  in drm_atomic_bridge_chain_select_bus_fmts()
988  * &drm_bridge_funcs.mode_fixup()) op for all the bridges in the encoder chain,
1000 	struct drm_encoder *encoder;  in drm_atomic_bridge_chain_check()  local
1012 	encoder = bridge->encoder;  in drm_atomic_bridge_chain_check()
1013 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {  in drm_atomic_bridge_chain_check()