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22 #ifndef _DRM_DP_MST_HELPER_H_
23 #define _DRM_DP_MST_HELPER_H_
25 #include <linux/types.h>
26 #include <drm/drm_dp_helper.h>
27 #include <drm/drm_atomic.h>
29 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
30 #include <linux/stackdepot.h>
31 #include <linux/timekeeping.h>
33 enum drm_dp_mst_topology_ref_type {
34 DRM_DP_MST_TOPOLOGY_REF_GET,
35 DRM_DP_MST_TOPOLOGY_REF_PUT,
38 struct drm_dp_mst_topology_ref_history {
39 struct drm_dp_mst_topology_ref_entry {
40 enum drm_dp_mst_topology_ref_type type;
43 depot_stack_handle_t backtrace;
47 #endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */
49 struct drm_dp_mst_branch;
52 * struct drm_dp_vcpi - Virtual Channel Payload Identifier
53 * @vcpi: Virtual channel ID.
54 * @pbn: Payload Bandwidth Number for this channel
55 * @aligned_pbn: PBN aligned with slot size
56 * @num_slots: number of slots for this PBN
66 * struct drm_dp_mst_port - MST port
67 * @port_num: port number
68 * @input: if this port is an input port. Protected by
69 * &drm_dp_mst_topology_mgr.base.lock.
70 * @mcs: message capability status - DP 1.2 spec. Protected by
71 * &drm_dp_mst_topology_mgr.base.lock.
72 * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by
73 * &drm_dp_mst_topology_mgr.base.lock.
74 * @pdt: Peer Device Type. Protected by
75 * &drm_dp_mst_topology_mgr.base.lock.
76 * @ldps: Legacy Device Plug Status. Protected by
77 * &drm_dp_mst_topology_mgr.base.lock.
78 * @dpcd_rev: DPCD revision of device on this port. Protected by
79 * &drm_dp_mst_topology_mgr.base.lock.
80 * @num_sdp_streams: Number of simultaneous streams. Protected by
81 * &drm_dp_mst_topology_mgr.base.lock.
82 * @num_sdp_stream_sinks: Number of stream sinks. Protected by
83 * &drm_dp_mst_topology_mgr.base.lock.
84 * @available_pbn: Available bandwidth for this port. Protected by
85 * &drm_dp_mst_topology_mgr.base.lock.
86 * @next: link to next port on this branch device
87 * @aux: i2c aux transport to talk to device connected to this port, protected
88 * by &drm_dp_mst_topology_mgr.base.lock.
89 * @parent: branch device parent of this port
90 * @vcpi: Virtual Channel Payload info for this port.
91 * @connector: DRM connector this port is connected to. Protected by
92 * &drm_dp_mst_topology_mgr.base.lock.
93 * @mgr: topology manager this port lives under.
95 * This structure represents an MST port endpoint on a device somewhere
96 * in the MST topology.
98 struct drm_dp_mst_port {
100 * @topology_kref: refcount for this port's lifetime in the topology,
101 * only the DP MST helpers should need to touch this
103 struct kref topology_kref;
106 * @malloc_kref: refcount for the memory allocation containing this
107 * structure. See drm_dp_mst_get_port_malloc() and
108 * drm_dp_mst_put_port_malloc().
110 struct kref malloc_kref;
112 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
114 * @topology_ref_history: A history of each topology
115 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
117 struct drm_dp_mst_topology_ref_history topology_ref_history;
128 u8 num_sdp_stream_sinks;
129 uint16_t available_pbn;
130 struct list_head next;
132 * @mstb: the branch device connected to this port, if there is one.
133 * This should be considered protected for reading by
134 * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this:
135 * &drm_dp_mst_topology_mgr.up_req_work and
136 * &drm_dp_mst_topology_mgr.work, which do not grab
137 * &drm_dp_mst_topology_mgr.lock during reads but are the only
138 * updaters of this list and are protected from writing concurrently
139 * by &drm_dp_mst_topology_mgr.probe_lock.
141 struct drm_dp_mst_branch *mstb;
142 struct drm_dp_aux aux; /* i2c bus for this port? */
143 struct drm_dp_mst_branch *parent;
145 struct drm_dp_vcpi vcpi;
146 struct drm_connector *connector;
147 struct drm_dp_mst_topology_mgr *mgr;
150 * @cached_edid: for DP logical ports - make tiling work by ensuring
151 * that the EDID for all connectors is read immediately.
153 struct edid *cached_edid;
155 * @has_audio: Tracks whether the sink connector to this port is
162 * struct drm_dp_mst_branch - MST branch device.
163 * @rad: Relative Address to talk to this branch device.
164 * @lct: Link count total to talk to this branch device.
165 * @num_ports: number of ports on the branch.
166 * @msg_slots: one bit per transmitted msg slot.
167 * @port_parent: pointer to the port parent, NULL if toplevel.
168 * @mgr: topology manager for this branch device.
169 * @tx_slots: transmission slots for this device.
170 * @last_seqno: last sequence number used to talk to this.
171 * @link_address_sent: if a link address message has been sent to this device yet.
172 * @guid: guid for DP 1.2 branch device. port under this branch can be
173 * identified by port #.
175 * This structure represents an MST branch device, there is one
176 * primary branch device at the root, along with any other branches connected
177 * to downstream port of parent branches.
179 struct drm_dp_mst_branch {
181 * @topology_kref: refcount for this branch device's lifetime in the
182 * topology, only the DP MST helpers should need to touch this
184 struct kref topology_kref;
187 * @malloc_kref: refcount for the memory allocation containing this
188 * structure. See drm_dp_mst_get_mstb_malloc() and
189 * drm_dp_mst_put_mstb_malloc().
191 struct kref malloc_kref;
193 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
195 * @topology_ref_history: A history of each topology
196 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
198 struct drm_dp_mst_topology_ref_history topology_ref_history;
202 * @destroy_next: linked-list entry used by
203 * drm_dp_delayed_destroy_work()
205 struct list_head destroy_next;
213 * @ports: the list of ports on this branch device. This should be
214 * considered protected for reading by &drm_dp_mst_topology_mgr.lock.
215 * There are two exceptions to this:
216 * &drm_dp_mst_topology_mgr.up_req_work and
217 * &drm_dp_mst_topology_mgr.work, which do not grab
218 * &drm_dp_mst_topology_mgr.lock during reads but are the only
219 * updaters of this list and are protected from updating the list
220 * concurrently by @drm_dp_mst_topology_mgr.probe_lock
222 struct list_head ports;
224 /* list of tx ops queue for this port */
225 struct drm_dp_mst_port *port_parent;
226 struct drm_dp_mst_topology_mgr *mgr;
228 /* slots are protected by mstb->mgr->qlock */
229 struct drm_dp_sideband_msg_tx *tx_slots[2];
231 bool link_address_sent;
233 /* global unique identifier to identify branch devices */
238 /* sideband msg header - not bit struct */
239 struct drm_dp_sideband_msg_hdr {
251 struct drm_dp_nak_reply {
257 struct drm_dp_link_address_ack_reply {
260 struct drm_dp_link_addr_reply_port {
266 bool legacy_device_plug_status;
270 u8 num_sdp_stream_sinks;
274 struct drm_dp_remote_dpcd_read_ack_reply {
280 struct drm_dp_remote_dpcd_write_ack_reply {
284 struct drm_dp_remote_dpcd_write_nak_reply {
287 u8 bytes_written_before_failure;
290 struct drm_dp_remote_i2c_read_ack_reply {
296 struct drm_dp_remote_i2c_read_nak_reply {
299 u8 i2c_nak_transaction;
302 struct drm_dp_remote_i2c_write_ack_reply {
307 struct drm_dp_sideband_msg_rx {
311 u8 curchunk_idx; /* chunk we are parsing now */
313 u8 curlen; /* total length of the msg */
316 struct drm_dp_sideband_msg_hdr initial_hdr;
319 #define DRM_DP_MAX_SDP_STREAMS 16
320 struct drm_dp_allocate_payload {
322 u8 number_sdp_streams;
325 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
328 struct drm_dp_allocate_payload_ack_reply {
334 struct drm_dp_connection_status_notify {
337 bool legacy_device_plug_status;
338 bool displayport_device_plug_status;
339 bool message_capability_status;
344 struct drm_dp_remote_dpcd_read {
350 struct drm_dp_remote_dpcd_write {
357 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
358 struct drm_dp_remote_i2c_read {
361 struct drm_dp_remote_i2c_read_tx {
366 u8 i2c_transaction_delay;
367 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
368 u8 read_i2c_device_id;
372 struct drm_dp_remote_i2c_write {
374 u8 write_i2c_device_id;
379 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
380 struct drm_dp_port_number_req {
384 struct drm_dp_enum_path_resources_ack_reply {
386 u16 full_payload_bw_number;
387 u16 avail_payload_bw_number;
390 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
391 struct drm_dp_port_number_rep {
395 struct drm_dp_query_payload {
400 struct drm_dp_resource_status_notify {
406 struct drm_dp_query_payload_ack_reply {
411 struct drm_dp_sideband_msg_req_body {
414 struct drm_dp_connection_status_notify conn_stat;
415 struct drm_dp_port_number_req port_num;
416 struct drm_dp_resource_status_notify resource_stat;
418 struct drm_dp_query_payload query_payload;
419 struct drm_dp_allocate_payload allocate_payload;
421 struct drm_dp_remote_dpcd_read dpcd_read;
422 struct drm_dp_remote_dpcd_write dpcd_write;
424 struct drm_dp_remote_i2c_read i2c_read;
425 struct drm_dp_remote_i2c_write i2c_write;
429 struct drm_dp_sideband_msg_reply_body {
433 struct drm_dp_nak_reply nak;
434 struct drm_dp_link_address_ack_reply link_addr;
435 struct drm_dp_port_number_rep port_number;
437 struct drm_dp_enum_path_resources_ack_reply path_resources;
438 struct drm_dp_allocate_payload_ack_reply allocate_payload;
439 struct drm_dp_query_payload_ack_reply query_payload;
441 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
442 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
443 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
445 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
446 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
447 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
451 /* msg is queued to be put into a slot */
452 #define DRM_DP_SIDEBAND_TX_QUEUED 0
453 /* msg has started transmitting on a slot - still on msgq */
454 #define DRM_DP_SIDEBAND_TX_START_SEND 1
455 /* msg has finished transmitting on a slot - removed from msgq only in slot */
456 #define DRM_DP_SIDEBAND_TX_SENT 2
457 /* msg has received a response - removed from slot */
458 #define DRM_DP_SIDEBAND_TX_RX 3
459 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
461 struct drm_dp_sideband_msg_tx {
466 struct drm_dp_mst_branch *dst;
467 struct list_head next;
471 struct drm_dp_sideband_msg_reply_body reply;
474 /* sideband msg handler */
475 struct drm_dp_mst_topology_mgr;
476 struct drm_dp_mst_topology_cbs {
477 /* create a connector for a port */
478 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
479 void (*register_connector)(struct drm_connector *connector);
480 void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
481 struct drm_connector *connector);
484 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
486 #define DP_PAYLOAD_LOCAL 1
487 #define DP_PAYLOAD_REMOTE 2
488 #define DP_PAYLOAD_DELETE_LOCAL 3
490 struct drm_dp_payload {
497 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
499 struct drm_dp_vcpi_allocation {
500 struct drm_dp_mst_port *port;
502 struct list_head next;
505 struct drm_dp_mst_topology_state {
506 struct drm_private_state base;
507 struct list_head vcpis;
508 struct drm_dp_mst_topology_mgr *mgr;
511 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
514 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
516 * This struct represents the toplevel displayport MST topology manager.
517 * There should be one instance of this for every MST capable DP connector
520 struct drm_dp_mst_topology_mgr {
522 * @base: Base private object for atomic
524 struct drm_private_obj base;
527 * @dev: device pointer for adding i2c devices etc.
529 struct drm_device *dev;
531 * @cbs: callbacks for connector addition and destruction.
533 const struct drm_dp_mst_topology_cbs *cbs;
535 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
538 int max_dpcd_transaction_bytes;
540 * @aux: AUX channel for the DP MST connector this topolgy mgr is
543 struct drm_dp_aux *aux;
545 * @max_payloads: maximum number of payloads the GPU can generate.
549 * @conn_base_id: DRM connector ID this mgr is connected to. Only used
550 * to build the MST connector path value.
555 * @down_rep_recv: Message receiver state for down replies.
557 struct drm_dp_sideband_msg_rx down_rep_recv;
559 * @up_req_recv: Message receiver state for up requests.
561 struct drm_dp_sideband_msg_rx up_req_recv;
564 * @lock: protects mst state, primary, dpcd.
569 * @probe_lock: Prevents @work and @up_req_work, the only writers of
570 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing
571 * while they update the topology.
573 struct mutex probe_lock;
576 * @mst_state: If this manager is enabled for an MST capable port. False
577 * if no MST sink/branch devices is connected.
581 * @mst_primary: Pointer to the primary/first branch device.
583 struct drm_dp_mst_branch *mst_primary;
586 * @dpcd: Cache of DPCD for primary port.
588 u8 dpcd[DP_RECEIVER_CAP_SIZE];
590 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
594 * @pbn_div: PBN to slots divisor.
599 * @funcs: Atomic helper callbacks
601 const struct drm_private_state_funcs *funcs;
604 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
605 * &drm_dp_sideband_msg_tx.state once they are queued
609 * @tx_msg_downq: List of pending down replies.
611 struct list_head tx_msg_downq;
614 * @payload_lock: Protect payload information.
616 struct mutex payload_lock;
618 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
619 * VCPI structure itself is &drm_dp_mst_port.vcpi.
621 struct drm_dp_vcpi **proposed_vcpis;
623 * @payloads: Array of payloads.
625 struct drm_dp_payload *payloads;
627 * @payload_mask: Elements of @payloads actually in use. Since
628 * reallocation of active outputs isn't possible gaps can be created by
629 * disabling outputs out of order compared to how they've been enabled.
631 unsigned long payload_mask;
633 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
635 unsigned long vcpi_mask;
638 * @tx_waitq: Wait to queue stall for the tx worker.
640 wait_queue_head_t tx_waitq;
644 struct work_struct work;
646 * @tx_work: Sideband transmit worker. This can nest within the main
647 * @work worker for each transaction @work launches.
649 struct work_struct tx_work;
652 * @destroy_port_list: List of to be destroyed connectors.
654 struct list_head destroy_port_list;
656 * @destroy_branch_device_list: List of to be destroyed branch
659 struct list_head destroy_branch_device_list;
661 * @delayed_destroy_lock: Protects @destroy_port_list and
662 * @destroy_branch_device_list.
664 struct mutex delayed_destroy_lock;
666 * @delayed_destroy_work: Work item to destroy MST port and branch
667 * devices, needed to avoid locking inversion.
669 struct work_struct delayed_destroy_work;
672 * @up_req_list: List of pending up requests from the topology that
673 * need to be processed, in chronological order.
675 struct list_head up_req_list;
677 * @up_req_lock: Protects @up_req_list
679 struct mutex up_req_lock;
681 * @up_req_work: Work item to process up requests received from the
682 * topology. Needed to avoid blocking hotplug handling and sideband
685 struct work_struct up_req_work;
687 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
689 * @topology_ref_history_lock: protects
690 * &drm_dp_mst_port.topology_ref_history and
691 * &drm_dp_mst_branch.topology_ref_history.
693 struct mutex topology_ref_history_lock;
697 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
698 struct drm_device *dev, struct drm_dp_aux *aux,
699 int max_dpcd_transaction_bytes,
700 int max_payloads, int conn_base_id);
702 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
705 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
708 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
712 drm_dp_mst_detect_port(struct drm_connector *connector,
713 struct drm_modeset_acquire_ctx *ctx,
714 struct drm_dp_mst_topology_mgr *mgr,
715 struct drm_dp_mst_port *port);
717 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
718 struct drm_dp_mst_port *port);
719 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
722 int drm_dp_calc_pbn_mode(int clock, int bpp);
725 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
726 struct drm_dp_mst_port *port, int pbn, int slots);
728 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
731 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
734 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
735 struct drm_dp_mst_port *port);
738 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
742 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
745 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
747 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
749 void drm_dp_mst_dump_topology(struct seq_file *m,
750 struct drm_dp_mst_topology_mgr *mgr);
752 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
754 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
757 ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,
758 unsigned int offset, void *buffer, size_t size);
759 ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
760 unsigned int offset, void *buffer, size_t size);
762 int drm_dp_mst_connector_late_register(struct drm_connector *connector,
763 struct drm_dp_mst_port *port);
764 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
765 struct drm_dp_mst_port *port);
767 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
768 struct drm_dp_mst_topology_mgr *mgr);
770 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
771 struct drm_dp_mst_topology_mgr *mgr,
772 struct drm_dp_mst_port *port, int pbn);
774 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
775 struct drm_dp_mst_topology_mgr *mgr,
776 struct drm_dp_mst_port *port);
777 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
778 struct drm_dp_mst_port *port, bool power_up);
779 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
781 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
782 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
784 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
787 * __drm_dp_mst_state_iter_get - private atomic state iterator function for
789 * @state: &struct drm_atomic_state pointer
790 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor
791 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state
793 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state
795 * @i: int iteration cursor, for macro-internal use
797 * Used by for_each_oldnew_mst_mgr_in_state(),
798 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't
799 * call this directly.
802 * True if the current &struct drm_private_obj is a &struct
803 * drm_dp_mst_topology_mgr, false otherwise.
806 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state,
807 struct drm_dp_mst_topology_mgr **mgr,
808 struct drm_dp_mst_topology_state **old_state,
809 struct drm_dp_mst_topology_state **new_state,
812 struct __drm_private_objs_state *objs_state = &state->private_objs[i];
814 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)
817 *mgr = to_dp_mst_topology_mgr(objs_state->ptr);
819 *old_state = to_dp_mst_topology_state(objs_state->old_state);
821 *new_state = to_dp_mst_topology_state(objs_state->new_state);
827 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology
828 * managers in an atomic update
829 * @__state: &struct drm_atomic_state pointer
830 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
831 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
833 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
835 * @__i: int iteration cursor, for macro-internal use
837 * This iterates over all DRM DP MST topology managers in an atomic update,
838 * tracking both old and new state. This is useful in places where the state
839 * delta needs to be considered, for example in atomic check functions.
841 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \
842 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
843 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
846 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers
847 * in an atomic update
848 * @__state: &struct drm_atomic_state pointer
849 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
850 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
852 * @__i: int iteration cursor, for macro-internal use
854 * This iterates over all DRM DP MST topology managers in an atomic update,
855 * tracking only the old state. This is useful in disable functions, where we
856 * need the old state the hardware is still in.
858 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \
859 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
860 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
863 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers
864 * in an atomic update
865 * @__state: &struct drm_atomic_state pointer
866 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
867 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
869 * @__i: int iteration cursor, for macro-internal use
871 * This iterates over all DRM DP MST topology managers in an atomic update,
872 * tracking only the new state. This is useful in enable functions, where we
873 * need the new state the hardware should be in when the atomic commit
874 * operation has completed.
876 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \
877 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
878 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))