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1/*
2 * Copyright © 2014 Red Hat.
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22#ifndef _DRM_DP_MST_HELPER_H_
23#define _DRM_DP_MST_HELPER_H_
24
25#include <linux/types.h>
26#include <drm/drm_dp_helper.h>
27#include <drm/drm_atomic.h>
28
29#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
30#include <linux/stackdepot.h>
31#include <linux/timekeeping.h>
32
33enum drm_dp_mst_topology_ref_type {
34 DRM_DP_MST_TOPOLOGY_REF_GET,
35 DRM_DP_MST_TOPOLOGY_REF_PUT,
36};
37
38struct drm_dp_mst_topology_ref_history {
39 struct drm_dp_mst_topology_ref_entry {
40 enum drm_dp_mst_topology_ref_type type;
41 int count;
42 ktime_t ts_nsec;
43 depot_stack_handle_t backtrace;
44 } *entries;
45 int len;
46};
47#endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */
48
49struct drm_dp_mst_branch;
50
51/**
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
57 */
58struct drm_dp_vcpi {
59 int vcpi;
60 int pbn;
61 int aligned_pbn;
62 int num_slots;
63};
64
65/**
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 * @full_pbn: Max possible 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.
94 *
95 * This structure represents an MST port endpoint on a device somewhere
96 * in the MST topology.
97 */
98struct drm_dp_mst_port {
99 /**
100 * @topology_kref: refcount for this port's lifetime in the topology,
101 * only the DP MST helpers should need to touch this
102 */
103 struct kref topology_kref;
104
105 /**
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().
109 */
110 struct kref malloc_kref;
111
112#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
113 /**
114 * @topology_ref_history: A history of each topology
115 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
116 */
117 struct drm_dp_mst_topology_ref_history topology_ref_history;
118#endif
119
120 u8 port_num;
121 bool input;
122 bool mcs;
123 bool ddps;
124 u8 pdt;
125 bool ldps;
126 u8 dpcd_rev;
127 u8 num_sdp_streams;
128 u8 num_sdp_stream_sinks;
129 uint16_t full_pbn;
130 struct list_head next;
131 /**
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.
140 */
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;
144
145 struct drm_dp_vcpi vcpi;
146 struct drm_connector *connector;
147 struct drm_dp_mst_topology_mgr *mgr;
148
149 /**
150 * @cached_edid: for DP logical ports - make tiling work by ensuring
151 * that the EDID for all connectors is read immediately.
152 */
153 struct edid *cached_edid;
154 /**
155 * @has_audio: Tracks whether the sink connector to this port is
156 * audio-capable.
157 */
158 bool has_audio;
159
160 /**
161 * @fec_capable: bool indicating if FEC can be supported up to that
162 * point in the MST topology.
163 */
164 bool fec_capable;
165};
166
167/* sideband msg header - not bit struct */
168struct drm_dp_sideband_msg_hdr {
169 u8 lct;
170 u8 lcr;
171 u8 rad[8];
172 bool broadcast;
173 bool path_msg;
174 u8 msg_len;
175 bool somt;
176 bool eomt;
177 bool seqno;
178};
179
180struct drm_dp_sideband_msg_rx {
181 u8 chunk[48];
182 u8 msg[256];
183 u8 curchunk_len;
184 u8 curchunk_idx; /* chunk we are parsing now */
185 u8 curchunk_hdrlen;
186 u8 curlen; /* total length of the msg */
187 bool have_somt;
188 bool have_eomt;
189 struct drm_dp_sideband_msg_hdr initial_hdr;
190};
191
192/**
193 * struct drm_dp_mst_branch - MST branch device.
194 * @rad: Relative Address to talk to this branch device.
195 * @lct: Link count total to talk to this branch device.
196 * @num_ports: number of ports on the branch.
197 * @port_parent: pointer to the port parent, NULL if toplevel.
198 * @mgr: topology manager for this branch device.
199 * @link_address_sent: if a link address message has been sent to this device yet.
200 * @guid: guid for DP 1.2 branch device. port under this branch can be
201 * identified by port #.
202 *
203 * This structure represents an MST branch device, there is one
204 * primary branch device at the root, along with any other branches connected
205 * to downstream port of parent branches.
206 */
207struct drm_dp_mst_branch {
208 /**
209 * @topology_kref: refcount for this branch device's lifetime in the
210 * topology, only the DP MST helpers should need to touch this
211 */
212 struct kref topology_kref;
213
214 /**
215 * @malloc_kref: refcount for the memory allocation containing this
216 * structure. See drm_dp_mst_get_mstb_malloc() and
217 * drm_dp_mst_put_mstb_malloc().
218 */
219 struct kref malloc_kref;
220
221#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
222 /**
223 * @topology_ref_history: A history of each topology
224 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
225 */
226 struct drm_dp_mst_topology_ref_history topology_ref_history;
227#endif
228
229 /**
230 * @destroy_next: linked-list entry used by
231 * drm_dp_delayed_destroy_work()
232 */
233 struct list_head destroy_next;
234
235 u8 rad[8];
236 u8 lct;
237 int num_ports;
238
239 /**
240 * @ports: the list of ports on this branch device. This should be
241 * considered protected for reading by &drm_dp_mst_topology_mgr.lock.
242 * There are two exceptions to this:
243 * &drm_dp_mst_topology_mgr.up_req_work and
244 * &drm_dp_mst_topology_mgr.work, which do not grab
245 * &drm_dp_mst_topology_mgr.lock during reads but are the only
246 * updaters of this list and are protected from updating the list
247 * concurrently by @drm_dp_mst_topology_mgr.probe_lock
248 */
249 struct list_head ports;
250
251 struct drm_dp_mst_port *port_parent;
252 struct drm_dp_mst_topology_mgr *mgr;
253
254 bool link_address_sent;
255
256 /* global unique identifier to identify branch devices */
257 u8 guid[16];
258};
259
260
261struct drm_dp_nak_reply {
262 u8 guid[16];
263 u8 reason;
264 u8 nak_data;
265};
266
267struct drm_dp_link_address_ack_reply {
268 u8 guid[16];
269 u8 nports;
270 struct drm_dp_link_addr_reply_port {
271 bool input_port;
272 u8 peer_device_type;
273 u8 port_number;
274 bool mcs;
275 bool ddps;
276 bool legacy_device_plug_status;
277 u8 dpcd_revision;
278 u8 peer_guid[16];
279 u8 num_sdp_streams;
280 u8 num_sdp_stream_sinks;
281 } ports[16];
282};
283
284struct drm_dp_remote_dpcd_read_ack_reply {
285 u8 port_number;
286 u8 num_bytes;
287 u8 bytes[255];
288};
289
290struct drm_dp_remote_dpcd_write_ack_reply {
291 u8 port_number;
292};
293
294struct drm_dp_remote_dpcd_write_nak_reply {
295 u8 port_number;
296 u8 reason;
297 u8 bytes_written_before_failure;
298};
299
300struct drm_dp_remote_i2c_read_ack_reply {
301 u8 port_number;
302 u8 num_bytes;
303 u8 bytes[255];
304};
305
306struct drm_dp_remote_i2c_read_nak_reply {
307 u8 port_number;
308 u8 nak_reason;
309 u8 i2c_nak_transaction;
310};
311
312struct drm_dp_remote_i2c_write_ack_reply {
313 u8 port_number;
314};
315
316
317#define DRM_DP_MAX_SDP_STREAMS 16
318struct drm_dp_allocate_payload {
319 u8 port_number;
320 u8 number_sdp_streams;
321 u8 vcpi;
322 u16 pbn;
323 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
324};
325
326struct drm_dp_allocate_payload_ack_reply {
327 u8 port_number;
328 u8 vcpi;
329 u16 allocated_pbn;
330};
331
332struct drm_dp_connection_status_notify {
333 u8 guid[16];
334 u8 port_number;
335 bool legacy_device_plug_status;
336 bool displayport_device_plug_status;
337 bool message_capability_status;
338 bool input_port;
339 u8 peer_device_type;
340};
341
342struct drm_dp_remote_dpcd_read {
343 u8 port_number;
344 u32 dpcd_address;
345 u8 num_bytes;
346};
347
348struct drm_dp_remote_dpcd_write {
349 u8 port_number;
350 u32 dpcd_address;
351 u8 num_bytes;
352 u8 *bytes;
353};
354
355#define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
356struct drm_dp_remote_i2c_read {
357 u8 num_transactions;
358 u8 port_number;
359 struct drm_dp_remote_i2c_read_tx {
360 u8 i2c_dev_id;
361 u8 num_bytes;
362 u8 *bytes;
363 u8 no_stop_bit;
364 u8 i2c_transaction_delay;
365 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
366 u8 read_i2c_device_id;
367 u8 num_bytes_read;
368};
369
370struct drm_dp_remote_i2c_write {
371 u8 port_number;
372 u8 write_i2c_device_id;
373 u8 num_bytes;
374 u8 *bytes;
375};
376
377/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
378struct drm_dp_port_number_req {
379 u8 port_number;
380};
381
382struct drm_dp_enum_path_resources_ack_reply {
383 u8 port_number;
384 bool fec_capable;
385 u16 full_payload_bw_number;
386 u16 avail_payload_bw_number;
387};
388
389/* covers POWER_DOWN_PHY, POWER_UP_PHY */
390struct drm_dp_port_number_rep {
391 u8 port_number;
392};
393
394struct drm_dp_query_payload {
395 u8 port_number;
396 u8 vcpi;
397};
398
399struct drm_dp_resource_status_notify {
400 u8 port_number;
401 u8 guid[16];
402 u16 available_pbn;
403};
404
405struct drm_dp_query_payload_ack_reply {
406 u8 port_number;
407 u16 allocated_pbn;
408};
409
410struct drm_dp_sideband_msg_req_body {
411 u8 req_type;
412 union ack_req {
413 struct drm_dp_connection_status_notify conn_stat;
414 struct drm_dp_port_number_req port_num;
415 struct drm_dp_resource_status_notify resource_stat;
416
417 struct drm_dp_query_payload query_payload;
418 struct drm_dp_allocate_payload allocate_payload;
419
420 struct drm_dp_remote_dpcd_read dpcd_read;
421 struct drm_dp_remote_dpcd_write dpcd_write;
422
423 struct drm_dp_remote_i2c_read i2c_read;
424 struct drm_dp_remote_i2c_write i2c_write;
425 } u;
426};
427
428struct drm_dp_sideband_msg_reply_body {
429 u8 reply_type;
430 u8 req_type;
431 union ack_replies {
432 struct drm_dp_nak_reply nak;
433 struct drm_dp_link_address_ack_reply link_addr;
434 struct drm_dp_port_number_rep port_number;
435
436 struct drm_dp_enum_path_resources_ack_reply path_resources;
437 struct drm_dp_allocate_payload_ack_reply allocate_payload;
438 struct drm_dp_query_payload_ack_reply query_payload;
439
440 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
441 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
442 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
443
444 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
445 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
446 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
447 } u;
448};
449
450/* msg is queued to be put into a slot */
451#define DRM_DP_SIDEBAND_TX_QUEUED 0
452/* msg has started transmitting on a slot - still on msgq */
453#define DRM_DP_SIDEBAND_TX_START_SEND 1
454/* msg has finished transmitting on a slot - removed from msgq only in slot */
455#define DRM_DP_SIDEBAND_TX_SENT 2
456/* msg has received a response - removed from slot */
457#define DRM_DP_SIDEBAND_TX_RX 3
458#define DRM_DP_SIDEBAND_TX_TIMEOUT 4
459
460struct drm_dp_sideband_msg_tx {
461 u8 msg[256];
462 u8 chunk[48];
463 u8 cur_offset;
464 u8 cur_len;
465 struct drm_dp_mst_branch *dst;
466 struct list_head next;
467 int seqno;
468 int state;
469 bool path_msg;
470 struct drm_dp_sideband_msg_reply_body reply;
471};
472
473/* sideband msg handler */
474struct drm_dp_mst_topology_mgr;
475struct drm_dp_mst_topology_cbs {
476 /* create a connector for a port */
477 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
478 /*
479 * Checks for any pending MST interrupts, passing them to MST core for
480 * processing, the same way an HPD IRQ pulse handler would do this.
481 * If provided MST core calls this callback from a poll-waiting loop
482 * when waiting for MST down message replies. The driver is expected
483 * to guard against a race between this callback and the driver's HPD
484 * IRQ pulse handler.
485 */
486 void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr);
487};
488
489#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
490
491#define DP_PAYLOAD_LOCAL 1
492#define DP_PAYLOAD_REMOTE 2
493#define DP_PAYLOAD_DELETE_LOCAL 3
494
495struct drm_dp_payload {
496 int payload_state;
497 int start_slot;
498 int num_slots;
499 int vcpi;
500};
501
502#define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
503
504struct drm_dp_vcpi_allocation {
505 struct drm_dp_mst_port *port;
506 int vcpi;
507 int pbn;
508 bool dsc_enabled;
509 struct list_head next;
510};
511
512struct drm_dp_mst_topology_state {
513 struct drm_private_state base;
514 struct list_head vcpis;
515 struct drm_dp_mst_topology_mgr *mgr;
516};
517
518#define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
519
520/**
521 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
522 *
523 * This struct represents the toplevel displayport MST topology manager.
524 * There should be one instance of this for every MST capable DP connector
525 * on the GPU.
526 */
527struct drm_dp_mst_topology_mgr {
528 /**
529 * @base: Base private object for atomic
530 */
531 struct drm_private_obj base;
532
533 /**
534 * @dev: device pointer for adding i2c devices etc.
535 */
536 struct drm_device *dev;
537 /**
538 * @cbs: callbacks for connector addition and destruction.
539 */
540 const struct drm_dp_mst_topology_cbs *cbs;
541 /**
542 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
543 * in one go.
544 */
545 int max_dpcd_transaction_bytes;
546 /**
547 * @aux: AUX channel for the DP MST connector this topolgy mgr is
548 * controlling.
549 */
550 struct drm_dp_aux *aux;
551 /**
552 * @max_payloads: maximum number of payloads the GPU can generate.
553 */
554 int max_payloads;
555 /**
556 * @conn_base_id: DRM connector ID this mgr is connected to. Only used
557 * to build the MST connector path value.
558 */
559 int conn_base_id;
560
561 /**
562 * @up_req_recv: Message receiver state for up requests.
563 */
564 struct drm_dp_sideband_msg_rx up_req_recv;
565
566 /**
567 * @down_rep_recv: Message receiver state for replies to down
568 * requests.
569 */
570 struct drm_dp_sideband_msg_rx down_rep_recv;
571
572 /**
573 * @lock: protects @mst_state, @mst_primary, @dpcd, and
574 * @payload_id_table_cleared.
575 */
576 struct mutex lock;
577
578 /**
579 * @probe_lock: Prevents @work and @up_req_work, the only writers of
580 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing
581 * while they update the topology.
582 */
583 struct mutex probe_lock;
584
585 /**
586 * @mst_state: If this manager is enabled for an MST capable port. False
587 * if no MST sink/branch devices is connected.
588 */
589 bool mst_state : 1;
590
591 /**
592 * @payload_id_table_cleared: Whether or not we've cleared the payload
593 * ID table for @mst_primary. Protected by @lock.
594 */
595 bool payload_id_table_cleared : 1;
596
597 /**
598 * @mst_primary: Pointer to the primary/first branch device.
599 */
600 struct drm_dp_mst_branch *mst_primary;
601
602 /**
603 * @dpcd: Cache of DPCD for primary port.
604 */
605 u8 dpcd[DP_RECEIVER_CAP_SIZE];
606 /**
607 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
608 */
609 u8 sink_count;
610 /**
611 * @pbn_div: PBN to slots divisor.
612 */
613 int pbn_div;
614
615 /**
616 * @funcs: Atomic helper callbacks
617 */
618 const struct drm_private_state_funcs *funcs;
619
620 /**
621 * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state
622 */
623 struct mutex qlock;
624
625 /**
626 * @tx_msg_downq: List of pending down requests
627 */
628 struct list_head tx_msg_downq;
629
630 /**
631 * @payload_lock: Protect payload information.
632 */
633 struct mutex payload_lock;
634 /**
635 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
636 * VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of
637 * this array is determined by @max_payloads.
638 */
639 struct drm_dp_vcpi **proposed_vcpis;
640 /**
641 * @payloads: Array of payloads. The size of this array is determined
642 * by @max_payloads.
643 */
644 struct drm_dp_payload *payloads;
645 /**
646 * @payload_mask: Elements of @payloads actually in use. Since
647 * reallocation of active outputs isn't possible gaps can be created by
648 * disabling outputs out of order compared to how they've been enabled.
649 */
650 unsigned long payload_mask;
651 /**
652 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
653 */
654 unsigned long vcpi_mask;
655
656 /**
657 * @tx_waitq: Wait to queue stall for the tx worker.
658 */
659 wait_queue_head_t tx_waitq;
660 /**
661 * @work: Probe work.
662 */
663 struct work_struct work;
664 /**
665 * @tx_work: Sideband transmit worker. This can nest within the main
666 * @work worker for each transaction @work launches.
667 */
668 struct work_struct tx_work;
669
670 /**
671 * @destroy_port_list: List of to be destroyed connectors.
672 */
673 struct list_head destroy_port_list;
674 /**
675 * @destroy_branch_device_list: List of to be destroyed branch
676 * devices.
677 */
678 struct list_head destroy_branch_device_list;
679 /**
680 * @delayed_destroy_lock: Protects @destroy_port_list and
681 * @destroy_branch_device_list.
682 */
683 struct mutex delayed_destroy_lock;
684
685 /**
686 * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items.
687 * A dedicated WQ makes it possible to drain any requeued work items
688 * on it.
689 */
690 struct workqueue_struct *delayed_destroy_wq;
691
692 /**
693 * @delayed_destroy_work: Work item to destroy MST port and branch
694 * devices, needed to avoid locking inversion.
695 */
696 struct work_struct delayed_destroy_work;
697
698 /**
699 * @up_req_list: List of pending up requests from the topology that
700 * need to be processed, in chronological order.
701 */
702 struct list_head up_req_list;
703 /**
704 * @up_req_lock: Protects @up_req_list
705 */
706 struct mutex up_req_lock;
707 /**
708 * @up_req_work: Work item to process up requests received from the
709 * topology. Needed to avoid blocking hotplug handling and sideband
710 * transmissions.
711 */
712 struct work_struct up_req_work;
713
714#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
715 /**
716 * @topology_ref_history_lock: protects
717 * &drm_dp_mst_port.topology_ref_history and
718 * &drm_dp_mst_branch.topology_ref_history.
719 */
720 struct mutex topology_ref_history_lock;
721#endif
722};
723
724int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
725 struct drm_device *dev, struct drm_dp_aux *aux,
726 int max_dpcd_transaction_bytes,
727 int max_payloads, int conn_base_id);
728
729void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
730
731
732int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
733
734
735int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
736
737
738int
739drm_dp_mst_detect_port(struct drm_connector *connector,
740 struct drm_modeset_acquire_ctx *ctx,
741 struct drm_dp_mst_topology_mgr *mgr,
742 struct drm_dp_mst_port *port);
743
744struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
745
746
747int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc);
748
749bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
750 struct drm_dp_mst_port *port, int pbn, int slots);
751
752int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
753
754
755void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
756
757
758void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
759 struct drm_dp_mst_port *port);
760
761
762int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
763 int pbn);
764
765
766int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
767
768
769int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
770
771int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
772
773void drm_dp_mst_dump_topology(struct seq_file *m,
774 struct drm_dp_mst_topology_mgr *mgr);
775
776void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
777int __must_check
778drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
779 bool sync);
780
781ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,
782 unsigned int offset, void *buffer, size_t size);
783ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
784 unsigned int offset, void *buffer, size_t size);
785
786int drm_dp_mst_connector_late_register(struct drm_connector *connector,
787 struct drm_dp_mst_port *port);
788void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
789 struct drm_dp_mst_port *port);
790
791struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
792 struct drm_dp_mst_topology_mgr *mgr);
793int __must_check
794drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
795 struct drm_dp_mst_topology_mgr *mgr,
796 struct drm_dp_mst_port *port, int pbn,
797 int pbn_div);
798int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
799 struct drm_dp_mst_port *port,
800 int pbn, int pbn_div,
801 bool enable);
802int __must_check
803drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,
804 struct drm_dp_mst_topology_mgr *mgr);
805int __must_check
806drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
807 struct drm_dp_mst_topology_mgr *mgr,
808 struct drm_dp_mst_port *port);
809int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
810 struct drm_dp_mst_port *port, bool power_up);
811int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
812
813void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
814void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
815
816struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
817
818extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
819
820/**
821 * __drm_dp_mst_state_iter_get - private atomic state iterator function for
822 * macro-internal use
823 * @state: &struct drm_atomic_state pointer
824 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor
825 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state
826 * iteration cursor
827 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state
828 * iteration cursor
829 * @i: int iteration cursor, for macro-internal use
830 *
831 * Used by for_each_oldnew_mst_mgr_in_state(),
832 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't
833 * call this directly.
834 *
835 * Returns:
836 * True if the current &struct drm_private_obj is a &struct
837 * drm_dp_mst_topology_mgr, false otherwise.
838 */
839static inline bool
840__drm_dp_mst_state_iter_get(struct drm_atomic_state *state,
841 struct drm_dp_mst_topology_mgr **mgr,
842 struct drm_dp_mst_topology_state **old_state,
843 struct drm_dp_mst_topology_state **new_state,
844 int i)
845{
846 struct __drm_private_objs_state *objs_state = &state->private_objs[i];
847
848 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)
849 return false;
850
851 *mgr = to_dp_mst_topology_mgr(objs_state->ptr);
852 if (old_state)
853 *old_state = to_dp_mst_topology_state(objs_state->old_state);
854 if (new_state)
855 *new_state = to_dp_mst_topology_state(objs_state->new_state);
856
857 return true;
858}
859
860/**
861 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology
862 * managers in an atomic update
863 * @__state: &struct drm_atomic_state pointer
864 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
865 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
866 * state
867 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
868 * state
869 * @__i: int iteration cursor, for macro-internal use
870 *
871 * This iterates over all DRM DP MST topology managers in an atomic update,
872 * tracking both old and new state. This is useful in places where the state
873 * delta needs to be considered, for example in atomic check functions.
874 */
875#define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \
876 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
877 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
878
879/**
880 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers
881 * in an atomic update
882 * @__state: &struct drm_atomic_state pointer
883 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
884 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
885 * state
886 * @__i: int iteration cursor, for macro-internal use
887 *
888 * This iterates over all DRM DP MST topology managers in an atomic update,
889 * tracking only the old state. This is useful in disable functions, where we
890 * need the old state the hardware is still in.
891 */
892#define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \
893 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
894 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
895
896/**
897 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers
898 * in an atomic update
899 * @__state: &struct drm_atomic_state pointer
900 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
901 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
902 * state
903 * @__i: int iteration cursor, for macro-internal use
904 *
905 * This iterates over all DRM DP MST topology managers in an atomic update,
906 * tracking only the new state. This is useful in enable functions, where we
907 * need the new state the hardware should be in when the atomic commit
908 * operation has completed.
909 */
910#define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \
911 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
912 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))
913
914#endif