include/drm/drm_dp_mst_helper.h

   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 struct drm_dp_mst_branch;
  30
  31 /**
  32  * struct drm_dp_vcpi - Virtual Channel Payload Identifier
  33  * @vcpi: Virtual channel ID.
  34  * @pbn: Payload Bandwidth Number for this channel
  35  * @aligned_pbn: PBN aligned with slot size
  36  * @num_slots: number of slots for this PBN
  37  */
  38 struct drm_dp_vcpi {
  39         int vcpi;
  40         int pbn;
  41         int aligned_pbn;
  42         int num_slots;
  43 };
  44
  45 /**
  46  * struct drm_dp_mst_port - MST port
  47  * @port_num: port number
  48  * @input: if this port is an input port.
  49  * @mcs: message capability status - DP 1.2 spec.
  50  * @ddps: DisplayPort Device Plug Status - DP 1.2
  51  * @pdt: Peer Device Type
  52  * @ldps: Legacy Device Plug Status
  53  * @dpcd_rev: DPCD revision of device on this port
  54  * @num_sdp_streams: Number of simultaneous streams
  55  * @num_sdp_stream_sinks: Number of stream sinks
  56  * @available_pbn: Available bandwidth for this port.
  57  * @next: link to next port on this branch device
  58  * @mstb: branch device attach below this port
  59  * @aux: i2c aux transport to talk to device connected to this port.
  60  * @parent: branch device parent of this port
  61  * @vcpi: Virtual Channel Payload info for this port.
  62  * @connector: DRM connector this port is connected to.
  63  * @mgr: topology manager this port lives under.
  64  *
  65  * This structure represents an MST port endpoint on a device somewhere
  66  * in the MST topology.
  67  */
  68 struct drm_dp_mst_port {
  69         /**
  70          * @topology_kref: refcount for this port's lifetime in the topology,
  71          * only the DP MST helpers should need to touch this
  72          */
  73         struct kref topology_kref;
  74
  75         /**
  76          * @malloc_kref: refcount for the memory allocation containing this
  77          * structure. See drm_dp_mst_get_port_malloc() and
  78          * drm_dp_mst_put_port_malloc().
  79          */
  80         struct kref malloc_kref;
  81
  82         u8 port_num;
  83         bool input;
  84         bool mcs;
  85         bool ddps;
  86         u8 pdt;
  87         bool ldps;
  88         u8 dpcd_rev;
  89         u8 num_sdp_streams;
  90         u8 num_sdp_stream_sinks;
  91         uint16_t available_pbn;
  92         struct list_head next;
  93         struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
  94         struct drm_dp_aux aux; /* i2c bus for this port? */
  95         struct drm_dp_mst_branch *parent;
  96
  97         struct drm_dp_vcpi vcpi;
  98         struct drm_connector *connector;
  99         struct drm_dp_mst_topology_mgr *mgr;
 100
 101         /**
 102          * @cached_edid: for DP logical ports - make tiling work by ensuring
 103          * that the EDID for all connectors is read immediately.
 104          */
 105         struct edid *cached_edid;
 106         /**
 107          * @has_audio: Tracks whether the sink connector to this port is
 108          * audio-capable.
 109          */
 110         bool has_audio;
 111 };
 112
 113 /**
 114  * struct drm_dp_mst_branch - MST branch device.
 115  * @rad: Relative Address to talk to this branch device.
 116  * @lct: Link count total to talk to this branch device.
 117  * @num_ports: number of ports on the branch.
 118  * @msg_slots: one bit per transmitted msg slot.
 119  * @ports: linked list of ports on this branch.
 120  * @port_parent: pointer to the port parent, NULL if toplevel.
 121  * @mgr: topology manager for this branch device.
 122  * @tx_slots: transmission slots for this device.
 123  * @last_seqno: last sequence number used to talk to this.
 124  * @link_address_sent: if a link address message has been sent to this device yet.
 125  * @guid: guid for DP 1.2 branch device. port under this branch can be
 126  * identified by port #.
 127  *
 128  * This structure represents an MST branch device, there is one
 129  * primary branch device at the root, along with any other branches connected
 130  * to downstream port of parent branches.
 131  */
 132 struct drm_dp_mst_branch {
 133         /**
 134          * @topology_kref: refcount for this branch device's lifetime in the
 135          * topology, only the DP MST helpers should need to touch this
 136          */
 137         struct kref topology_kref;
 138
 139         /**
 140          * @malloc_kref: refcount for the memory allocation containing this
 141          * structure. See drm_dp_mst_get_mstb_malloc() and
 142          * drm_dp_mst_put_mstb_malloc().
 143          */
 144         struct kref malloc_kref;
 145
 146         u8 rad[8];
 147         u8 lct;
 148         int num_ports;
 149
 150         int msg_slots;
 151         struct list_head ports;
 152
 153         /* list of tx ops queue for this port */
 154         struct drm_dp_mst_port *port_parent;
 155         struct drm_dp_mst_topology_mgr *mgr;
 156
 157         /* slots are protected by mstb->mgr->qlock */
 158         struct drm_dp_sideband_msg_tx *tx_slots[2];
 159         int last_seqno;
 160         bool link_address_sent;
 161
 162         /* global unique identifier to identify branch devices */
 163         u8 guid[16];
 164 };
 165
 166
 167 /* sideband msg header - not bit struct */
 168 struct 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
 180 struct drm_dp_nak_reply {
 181         u8 guid[16];
 182         u8 reason;
 183         u8 nak_data;
 184 };
 185
 186 struct drm_dp_link_address_ack_reply {
 187         u8 guid[16];
 188         u8 nports;
 189         struct drm_dp_link_addr_reply_port {
 190                 bool input_port;
 191                 u8 peer_device_type;
 192                 u8 port_number;
 193                 bool mcs;
 194                 bool ddps;
 195                 bool legacy_device_plug_status;
 196                 u8 dpcd_revision;
 197                 u8 peer_guid[16];
 198                 u8 num_sdp_streams;
 199                 u8 num_sdp_stream_sinks;
 200         } ports[16];
 201 };
 202
 203 struct drm_dp_remote_dpcd_read_ack_reply {
 204         u8 port_number;
 205         u8 num_bytes;
 206         u8 bytes[255];
 207 };
 208
 209 struct drm_dp_remote_dpcd_write_ack_reply {
 210         u8 port_number;
 211 };
 212
 213 struct drm_dp_remote_dpcd_write_nak_reply {
 214         u8 port_number;
 215         u8 reason;
 216         u8 bytes_written_before_failure;
 217 };
 218
 219 struct drm_dp_remote_i2c_read_ack_reply {
 220         u8 port_number;
 221         u8 num_bytes;
 222         u8 bytes[255];
 223 };
 224
 225 struct drm_dp_remote_i2c_read_nak_reply {
 226         u8 port_number;
 227         u8 nak_reason;
 228         u8 i2c_nak_transaction;
 229 };
 230
 231 struct drm_dp_remote_i2c_write_ack_reply {
 232         u8 port_number;
 233 };
 234
 235
 236 struct drm_dp_sideband_msg_rx {
 237         u8 chunk[48];
 238         u8 msg[256];
 239         u8 curchunk_len;
 240         u8 curchunk_idx; /* chunk we are parsing now */
 241         u8 curchunk_hdrlen;
 242         u8 curlen; /* total length of the msg */
 243         bool have_somt;
 244         bool have_eomt;
 245         struct drm_dp_sideband_msg_hdr initial_hdr;
 246 };
 247
 248 #define DRM_DP_MAX_SDP_STREAMS 16
 249 struct drm_dp_allocate_payload {
 250         u8 port_number;
 251         u8 number_sdp_streams;
 252         u8 vcpi;
 253         u16 pbn;
 254         u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
 255 };
 256
 257 struct drm_dp_allocate_payload_ack_reply {
 258         u8 port_number;
 259         u8 vcpi;
 260         u16 allocated_pbn;
 261 };
 262
 263 struct drm_dp_connection_status_notify {
 264         u8 guid[16];
 265         u8 port_number;
 266         bool legacy_device_plug_status;
 267         bool displayport_device_plug_status;
 268         bool message_capability_status;
 269         bool input_port;
 270         u8 peer_device_type;
 271 };
 272
 273 struct drm_dp_remote_dpcd_read {
 274         u8 port_number;
 275         u32 dpcd_address;
 276         u8 num_bytes;
 277 };
 278
 279 struct drm_dp_remote_dpcd_write {
 280         u8 port_number;
 281         u32 dpcd_address;
 282         u8 num_bytes;
 283         u8 *bytes;
 284 };
 285
 286 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
 287 struct drm_dp_remote_i2c_read {
 288         u8 num_transactions;
 289         u8 port_number;
 290         struct {
 291                 u8 i2c_dev_id;
 292                 u8 num_bytes;
 293                 u8 *bytes;
 294                 u8 no_stop_bit;
 295                 u8 i2c_transaction_delay;
 296         } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
 297         u8 read_i2c_device_id;
 298         u8 num_bytes_read;
 299 };
 300
 301 struct drm_dp_remote_i2c_write {
 302         u8 port_number;
 303         u8 write_i2c_device_id;
 304         u8 num_bytes;
 305         u8 *bytes;
 306 };
 307
 308 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
 309 struct drm_dp_port_number_req {
 310         u8 port_number;
 311 };
 312
 313 struct drm_dp_enum_path_resources_ack_reply {
 314         u8 port_number;
 315         u16 full_payload_bw_number;
 316         u16 avail_payload_bw_number;
 317 };
 318
 319 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
 320 struct drm_dp_port_number_rep {
 321         u8 port_number;
 322 };
 323
 324 struct drm_dp_query_payload {
 325         u8 port_number;
 326         u8 vcpi;
 327 };
 328
 329 struct drm_dp_resource_status_notify {
 330         u8 port_number;
 331         u8 guid[16];
 332         u16 available_pbn;
 333 };
 334
 335 struct drm_dp_query_payload_ack_reply {
 336         u8 port_number;
 337         u8 allocated_pbn;
 338 };
 339
 340 struct drm_dp_sideband_msg_req_body {
 341         u8 req_type;
 342         union ack_req {
 343                 struct drm_dp_connection_status_notify conn_stat;
 344                 struct drm_dp_port_number_req port_num;
 345                 struct drm_dp_resource_status_notify resource_stat;
 346
 347                 struct drm_dp_query_payload query_payload;
 348                 struct drm_dp_allocate_payload allocate_payload;
 349
 350                 struct drm_dp_remote_dpcd_read dpcd_read;
 351                 struct drm_dp_remote_dpcd_write dpcd_write;
 352
 353                 struct drm_dp_remote_i2c_read i2c_read;
 354                 struct drm_dp_remote_i2c_write i2c_write;
 355         } u;
 356 };
 357
 358 struct drm_dp_sideband_msg_reply_body {
 359         u8 reply_type;
 360         u8 req_type;
 361         union ack_replies {
 362                 struct drm_dp_nak_reply nak;
 363                 struct drm_dp_link_address_ack_reply link_addr;
 364                 struct drm_dp_port_number_rep port_number;
 365
 366                 struct drm_dp_enum_path_resources_ack_reply path_resources;
 367                 struct drm_dp_allocate_payload_ack_reply allocate_payload;
 368                 struct drm_dp_query_payload_ack_reply query_payload;
 369
 370                 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
 371                 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
 372                 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
 373
 374                 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
 375                 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
 376                 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
 377         } u;
 378 };
 379
 380 /* msg is queued to be put into a slot */
 381 #define DRM_DP_SIDEBAND_TX_QUEUED 0
 382 /* msg has started transmitting on a slot - still on msgq */
 383 #define DRM_DP_SIDEBAND_TX_START_SEND 1
 384 /* msg has finished transmitting on a slot - removed from msgq only in slot */
 385 #define DRM_DP_SIDEBAND_TX_SENT 2
 386 /* msg has received a response - removed from slot */
 387 #define DRM_DP_SIDEBAND_TX_RX 3
 388 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
 389
 390 struct drm_dp_sideband_msg_tx {
 391         u8 msg[256];
 392         u8 chunk[48];
 393         u8 cur_offset;
 394         u8 cur_len;
 395         struct drm_dp_mst_branch *dst;
 396         struct list_head next;
 397         int seqno;
 398         int state;
 399         bool path_msg;
 400         struct drm_dp_sideband_msg_reply_body reply;
 401 };
 402
 403 /* sideband msg handler */
 404 struct drm_dp_mst_topology_mgr;
 405 struct drm_dp_mst_topology_cbs {
 406         /* create a connector for a port */
 407         struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
 408         void (*register_connector)(struct drm_connector *connector);
 409         void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
 410                                   struct drm_connector *connector);
 411 };
 412
 413 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
 414
 415 #define DP_PAYLOAD_LOCAL 1
 416 #define DP_PAYLOAD_REMOTE 2
 417 #define DP_PAYLOAD_DELETE_LOCAL 3
 418
 419 struct drm_dp_payload {
 420         int payload_state;
 421         int start_slot;
 422         int num_slots;
 423         int vcpi;
 424 };
 425
 426 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
 427
 428 struct drm_dp_vcpi_allocation {
 429         struct drm_dp_mst_port *port;
 430         int vcpi;
 431         struct list_head next;
 432 };
 433
 434 struct drm_dp_mst_topology_state {
 435         struct drm_private_state base;
 436         struct list_head vcpis;
 437         struct drm_dp_mst_topology_mgr *mgr;
 438 };
 439
 440 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
 441
 442 /**
 443  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
 444  *
 445  * This struct represents the toplevel displayport MST topology manager.
 446  * There should be one instance of this for every MST capable DP connector
 447  * on the GPU.
 448  */
 449 struct drm_dp_mst_topology_mgr {
 450         /**
 451          * @base: Base private object for atomic
 452          */
 453         struct drm_private_obj base;
 454
 455         /**
 456          * @dev: device pointer for adding i2c devices etc.
 457          */
 458         struct drm_device *dev;
 459         /**
 460          * @cbs: callbacks for connector addition and destruction.
 461          */
 462         const struct drm_dp_mst_topology_cbs *cbs;
 463         /**
 464          * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
 465          * in one go.
 466          */
 467         int max_dpcd_transaction_bytes;
 468         /**
 469          * @aux: AUX channel for the DP MST connector this topolgy mgr is
 470          * controlling.
 471          */
 472         struct drm_dp_aux *aux;
 473         /**
 474          * @max_payloads: maximum number of payloads the GPU can generate.
 475          */
 476         int max_payloads;
 477         /**
 478          * @conn_base_id: DRM connector ID this mgr is connected to. Only used
 479          * to build the MST connector path value.
 480          */
 481         int conn_base_id;
 482
 483         /**
 484          * @down_rep_recv: Message receiver state for down replies. This and
 485          * @up_req_recv are only ever access from the work item, which is
 486          * serialised.
 487          */
 488         struct drm_dp_sideband_msg_rx down_rep_recv;
 489         /**
 490          * @up_req_recv: Message receiver state for up requests. This and
 491          * @down_rep_recv are only ever access from the work item, which is
 492          * serialised.
 493          */
 494         struct drm_dp_sideband_msg_rx up_req_recv;
 495
 496         /**
 497          * @lock: protects mst state, primary, dpcd.
 498          */
 499         struct mutex lock;
 500
 501         /**
 502          * @mst_state: If this manager is enabled for an MST capable port. False
 503          * if no MST sink/branch devices is connected.
 504          */
 505         bool mst_state;
 506         /**
 507          * @mst_primary: Pointer to the primary/first branch device.
 508          */
 509         struct drm_dp_mst_branch *mst_primary;
 510
 511         /**
 512          * @dpcd: Cache of DPCD for primary port.
 513          */
 514         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 515         /**
 516          * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
 517          */
 518         u8 sink_count;
 519         /**
 520          * @pbn_div: PBN to slots divisor.
 521          */
 522         int pbn_div;
 523
 524         /**
 525          * @funcs: Atomic helper callbacks
 526          */
 527         const struct drm_private_state_funcs *funcs;
 528
 529         /**
 530          * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
 531          * &drm_dp_sideband_msg_tx.state once they are queued
 532          */
 533         struct mutex qlock;
 534         /**
 535          * @tx_msg_downq: List of pending down replies.
 536          */
 537         struct list_head tx_msg_downq;
 538
 539         /**
 540          * @payload_lock: Protect payload information.
 541          */
 542         struct mutex payload_lock;
 543         /**
 544          * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
 545          * VCPI structure itself is &drm_dp_mst_port.vcpi.
 546          */
 547         struct drm_dp_vcpi **proposed_vcpis;
 548         /**
 549          * @payloads: Array of payloads.
 550          */
 551         struct drm_dp_payload *payloads;
 552         /**
 553          * @payload_mask: Elements of @payloads actually in use. Since
 554          * reallocation of active outputs isn't possible gaps can be created by
 555          * disabling outputs out of order compared to how they've been enabled.
 556          */
 557         unsigned long payload_mask;
 558         /**
 559          * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
 560          */
 561         unsigned long vcpi_mask;
 562
 563         /**
 564          * @tx_waitq: Wait to queue stall for the tx worker.
 565          */
 566         wait_queue_head_t tx_waitq;
 567         /**
 568          * @work: Probe work.
 569          */
 570         struct work_struct work;
 571         /**
 572          * @tx_work: Sideband transmit worker. This can nest within the main
 573          * @work worker for each transaction @work launches.
 574          */
 575         struct work_struct tx_work;
 576
 577         /**
 578          * @destroy_connector_list: List of to be destroyed connectors.
 579          */
 580         struct list_head destroy_connector_list;
 581         /**
 582          * @destroy_connector_lock: Protects @connector_list.
 583          */
 584         struct mutex destroy_connector_lock;
 585         /**
 586          * @destroy_connector_work: Work item to destroy connectors. Needed to
 587          * avoid locking inversion.
 588          */
 589         struct work_struct destroy_connector_work;
 590 };
 591
 592 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
 593                                  struct drm_device *dev, struct drm_dp_aux *aux,
 594                                  int max_dpcd_transaction_bytes,
 595                                  int max_payloads, int conn_base_id);
 596
 597 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
 598
 599
 600 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
 601
 602
 603 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
 604
 605
 606 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 607
 608 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
 609                                         struct drm_dp_mst_port *port);
 610 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 611
 612
 613 int drm_dp_calc_pbn_mode(int clock, int bpp);
 614
 615
 616 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 617                               struct drm_dp_mst_port *port, int pbn, int slots);
 618
 619 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 620
 621
 622 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 623
 624
 625 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 626                                 struct drm_dp_mst_port *port);
 627
 628
 629 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
 630                            int pbn);
 631
 632
 633 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
 634
 635
 636 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
 637
 638 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
 639
 640 void drm_dp_mst_dump_topology(struct seq_file *m,
 641                               struct drm_dp_mst_topology_mgr *mgr);
 642
 643 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 644 int __must_check
 645 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
 646 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
 647                                                                     struct drm_dp_mst_topology_mgr *mgr);
 648 int __must_check
 649 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
 650                               struct drm_dp_mst_topology_mgr *mgr,
 651                               struct drm_dp_mst_port *port, int pbn);
 652 int __must_check
 653 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
 654                                  struct drm_dp_mst_topology_mgr *mgr,
 655                                  struct drm_dp_mst_port *port);
 656 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
 657                                  struct drm_dp_mst_port *port, bool power_up);
 658 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
 659
 660 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
 661 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
 662
 663 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
 664
 665 /**
 666  * __drm_dp_mst_state_iter_get - private atomic state iterator function for
 667  * macro-internal use
 668  * @state: &struct drm_atomic_state pointer
 669  * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor
 670  * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state
 671  * iteration cursor
 672  * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state
 673  * iteration cursor
 674  * @i: int iteration cursor, for macro-internal use
 675  *
 676  * Used by for_each_oldnew_mst_mgr_in_state(),
 677  * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't
 678  * call this directly.
 679  *
 680  * Returns:
 681  * True if the current &struct drm_private_obj is a &struct
 682  * drm_dp_mst_topology_mgr, false otherwise.
 683  */
 684 static inline bool
 685 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state,
 686                             struct drm_dp_mst_topology_mgr **mgr,
 687                             struct drm_dp_mst_topology_state **old_state,
 688                             struct drm_dp_mst_topology_state **new_state,
 689                             int i)
 690 {
 691         struct __drm_private_objs_state *objs_state = &state->private_objs[i];
 692
 693         if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)
 694                 return false;
 695
 696         *mgr = to_dp_mst_topology_mgr(objs_state->ptr);
 697         if (old_state)
 698                 *old_state = to_dp_mst_topology_state(objs_state->old_state);
 699         if (new_state)
 700                 *new_state = to_dp_mst_topology_state(objs_state->new_state);
 701
 702         return true;
 703 }
 704
 705 /**
 706  * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology
 707  * managers in an atomic update
 708  * @__state: &struct drm_atomic_state pointer
 709  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 710  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
 711  * state
 712  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
 713  * state
 714  * @__i: int iteration cursor, for macro-internal use
 715  *
 716  * This iterates over all DRM DP MST topology managers in an atomic update,
 717  * tracking both old and new state. This is useful in places where the state
 718  * delta needs to be considered, for example in atomic check functions.
 719  */
 720 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \
 721         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 722                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
 723
 724 /**
 725  * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers
 726  * in an atomic update
 727  * @__state: &struct drm_atomic_state pointer
 728  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 729  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
 730  * state
 731  * @__i: int iteration cursor, for macro-internal use
 732  *
 733  * This iterates over all DRM DP MST topology managers in an atomic update,
 734  * tracking only the old state. This is useful in disable functions, where we
 735  * need the old state the hardware is still in.
 736  */
 737 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \
 738         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 739                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
 740
 741 /**
 742  * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers
 743  * in an atomic update
 744  * @__state: &struct drm_atomic_state pointer
 745  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 746  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
 747  * state
 748  * @__i: int iteration cursor, for macro-internal use
 749  *
 750  * This iterates over all DRM DP MST topology managers in an atomic update,
 751  * tracking only the new state. This is useful in enable functions, where we
 752  * need the new state the hardware should be in when the atomic commit
 753  * operation has completed.
 754  */
 755 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \
 756         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 757                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))
 758
 759 #endif