aboutsummaryrefslogtreecommitdiff
path: root/include/drm/drm_dp_mst_helper.h
blob: 7f78d26a076694ce5dcd42fe99da555fe092daa1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
/*
 * Copyright © 2014 Red Hat.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */
#ifndef _DRM_DP_MST_HELPER_H_
#define _DRM_DP_MST_HELPER_H_

#include <linux/types.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_atomic.h>

struct drm_dp_mst_branch;

/**
 * struct drm_dp_vcpi - Virtual Channel Payload Identifier
 * @vcpi: Virtual channel ID.
 * @pbn: Payload Bandwidth Number for this channel
 * @aligned_pbn: PBN aligned with slot size
 * @num_slots: number of slots for this PBN
 */
struct drm_dp_vcpi {
	int vcpi;
	int pbn;
	int aligned_pbn;
	int num_slots;
};

/**
 * struct drm_dp_mst_port - MST port
 * @kref: reference count for this port.
 * @port_num: port number
 * @input: if this port is an input port.
 * @mcs: message capability status - DP 1.2 spec.
 * @ddps: DisplayPort Device Plug Status - DP 1.2
 * @pdt: Peer Device Type
 * @ldps: Legacy Device Plug Status
 * @dpcd_rev: DPCD revision of device on this port
 * @num_sdp_streams: Number of simultaneous streams
 * @num_sdp_stream_sinks: Number of stream sinks
 * @available_pbn: Available bandwidth for this port.
 * @next: link to next port on this branch device
 * @mstb: branch device attach below this port
 * @aux: i2c aux transport to talk to device connected to this port.
 * @parent: branch device parent of this port
 * @vcpi: Virtual Channel Payload info for this port.
 * @connector: DRM connector this port is connected to.
 * @mgr: topology manager this port lives under.
 *
 * This structure represents an MST port endpoint on a device somewhere
 * in the MST topology.
 */
struct drm_dp_mst_port {
	struct kref kref;

	u8 port_num;
	bool input;
	bool mcs;
	bool ddps;
	u8 pdt;
	bool ldps;
	u8 dpcd_rev;
	u8 num_sdp_streams;
	u8 num_sdp_stream_sinks;
	uint16_t available_pbn;
	struct list_head next;
	struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
	struct drm_dp_aux aux; /* i2c bus for this port? */
	struct drm_dp_mst_branch *parent;

	struct drm_dp_vcpi vcpi;
	struct drm_connector *connector;
	struct drm_dp_mst_topology_mgr *mgr;

	/**
	 * @cached_edid: for DP logical ports - make tiling work by ensuring
	 * that the EDID for all connectors is read immediately.
	 */
	struct edid *cached_edid;
	/**
	 * @has_audio: Tracks whether the sink connector to this port is
	 * audio-capable.
	 */
	bool has_audio;
};

/**
 * struct drm_dp_mst_branch - MST branch device.
 * @kref: reference count for this port.
 * @rad: Relative Address to talk to this branch device.
 * @lct: Link count total to talk to this branch device.
 * @num_ports: number of ports on the branch.
 * @msg_slots: one bit per transmitted msg slot.
 * @ports: linked list of ports on this branch.
 * @port_parent: pointer to the port parent, NULL if toplevel.
 * @mgr: topology manager for this branch device.
 * @tx_slots: transmission slots for this device.
 * @last_seqno: last sequence number used to talk to this.
 * @link_address_sent: if a link address message has been sent to this device yet.
 * @guid: guid for DP 1.2 branch device. port under this branch can be
 * identified by port #.
 *
 * This structure represents an MST branch device, there is one
 * primary branch device at the root, along with any other branches connected
 * to downstream port of parent branches.
 */
struct drm_dp_mst_branch {
	struct kref kref;
	u8 rad[8];
	u8 lct;
	int num_ports;

	int msg_slots;
	struct list_head ports;

	/* list of tx ops queue for this port */
	struct drm_dp_mst_port *port_parent;
	struct drm_dp_mst_topology_mgr *mgr;

	/* slots are protected by mstb->mgr->qlock */
	struct drm_dp_sideband_msg_tx *tx_slots[2];
	int last_seqno;
	bool link_address_sent;

	/* global unique identifier to identify branch devices */
	u8 guid[16];
};


/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
	u8 lct;
	u8 lcr;
	u8 rad[8];
	bool broadcast;
	bool path_msg;
	u8 msg_len;
	bool somt;
	bool eomt;
	bool seqno;
};

struct drm_dp_nak_reply {
	u8 guid[16];
	u8 reason;
	u8 nak_data;
};

struct drm_dp_link_address_ack_reply {
	u8 guid[16];
	u8 nports;
	struct drm_dp_link_addr_reply_port {
		bool input_port;
		u8 peer_device_type;
		u8 port_number;
		bool mcs;
		bool ddps;
		bool legacy_device_plug_status;
		u8 dpcd_revision;
		u8 peer_guid[16];
		u8 num_sdp_streams;
		u8 num_sdp_stream_sinks;
	} ports[16];
};

struct drm_dp_remote_dpcd_read_ack_reply {
	u8 port_number;
	u8 num_bytes;
	u8 bytes[255];
};

struct drm_dp_remote_dpcd_write_ack_reply {
	u8 port_number;
};

struct drm_dp_remote_dpcd_write_nak_reply {
	u8 port_number;
	u8 reason;
	u8 bytes_written_before_failure;
};

struct drm_dp_remote_i2c_read_ack_reply {
	u8 port_number;
	u8 num_bytes;
	u8 bytes[255];
};

struct drm_dp_remote_i2c_read_nak_reply {
	u8 port_number;
	u8 nak_reason;
	u8 i2c_nak_transaction;
};

struct drm_dp_remote_i2c_write_ack_reply {
	u8 port_number;
};


struct drm_dp_sideband_msg_rx {
	u8 chunk[48];
	u8 msg[256];
	u8 curchunk_len;
	u8 curchunk_idx; /* chunk we are parsing now */
	u8 curchunk_hdrlen;
	u8 curlen; /* total length of the msg */
	bool have_somt;
	bool have_eomt;
	struct drm_dp_sideband_msg_hdr initial_hdr;
};

#define DRM_DP_MAX_SDP_STREAMS 16
struct drm_dp_allocate_payload {
	u8 port_number;
	u8 number_sdp_streams;
	u8 vcpi;
	u16 pbn;
	u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
};

struct drm_dp_allocate_payload_ack_reply {
	u8 port_number;
	u8 vcpi;
	u16 allocated_pbn;
};

struct drm_dp_connection_status_notify {
	u8 guid[16];
	u8 port_number;
	bool legacy_device_plug_status;
	bool displayport_device_plug_status;
	bool message_capability_status;
	bool input_port;
	u8 peer_device_type;
};

struct drm_dp_remote_dpcd_read {
	u8 port_number;
	u32 dpcd_address;
	u8 num_bytes;
};

struct drm_dp_remote_dpcd_write {
	u8 port_number;
	u32 dpcd_address;
	u8 num_bytes;
	u8 *bytes;
};

#define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
struct drm_dp_remote_i2c_read {
	u8 num_transactions;
	u8 port_number;
	struct {
		u8 i2c_dev_id;
		u8 num_bytes;
		u8 *bytes;
		u8 no_stop_bit;
		u8 i2c_transaction_delay;
	} transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
	u8 read_i2c_device_id;
	u8 num_bytes_read;
};

struct drm_dp_remote_i2c_write {
	u8 port_number;
	u8 write_i2c_device_id;
	u8 num_bytes;
	u8 *bytes;
};

/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
struct drm_dp_port_number_req {
	u8 port_number;
};

struct drm_dp_enum_path_resources_ack_reply {
	u8 port_number;
	u16 full_payload_bw_number;
	u16 avail_payload_bw_number;
};

/* covers POWER_DOWN_PHY, POWER_UP_PHY */
struct drm_dp_port_number_rep {
	u8 port_number;
};

struct drm_dp_query_payload {
	u8 port_number;
	u8 vcpi;
};

struct drm_dp_resource_status_notify {
	u8 port_number;
	u8 guid[16];
	u16 available_pbn;
};

struct drm_dp_query_payload_ack_reply {
	u8 port_number;
	u8 allocated_pbn;
};

struct drm_dp_sideband_msg_req_body {
	u8 req_type;
	union ack_req {
		struct drm_dp_connection_status_notify conn_stat;
		struct drm_dp_port_number_req port_num;
		struct drm_dp_resource_status_notify resource_stat;

		struct drm_dp_query_payload query_payload;
		struct drm_dp_allocate_payload allocate_payload;

		struct drm_dp_remote_dpcd_read dpcd_read;
		struct drm_dp_remote_dpcd_write dpcd_write;

		struct drm_dp_remote_i2c_read i2c_read;
		struct drm_dp_remote_i2c_write i2c_write;
	} u;
};

struct drm_dp_sideband_msg_reply_body {
	u8 reply_type;
	u8 req_type;
	union ack_replies {
		struct drm_dp_nak_reply nak;
		struct drm_dp_link_address_ack_reply link_addr;
		struct drm_dp_port_number_rep port_number;

		struct drm_dp_enum_path_resources_ack_reply path_resources;
		struct drm_dp_allocate_payload_ack_reply allocate_payload;
		struct drm_dp_query_payload_ack_reply query_payload;

		struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
		struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
		struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;

		struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
		struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
		struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
	} u;
};

/* msg is queued to be put into a slot */
#define DRM_DP_SIDEBAND_TX_QUEUED 0
/* msg has started transmitting on a slot - still on msgq */
#define DRM_DP_SIDEBAND_TX_START_SEND 1
/* msg has finished transmitting on a slot - removed from msgq only in slot */
#define DRM_DP_SIDEBAND_TX_SENT 2
/* msg has received a response - removed from slot */
#define DRM_DP_SIDEBAND_TX_RX 3
#define DRM_DP_SIDEBAND_TX_TIMEOUT 4

struct drm_dp_sideband_msg_tx {
	u8 msg[256];
	u8 chunk[48];
	u8 cur_offset;
	u8 cur_len;
	struct drm_dp_mst_branch *dst;
	struct list_head next;
	int seqno;
	int state;
	bool path_msg;
	struct drm_dp_sideband_msg_reply_body reply;
};

/* sideband msg handler */
struct drm_dp_mst_topology_mgr;
struct drm_dp_mst_topology_cbs {
	/* create a connector for a port */
	struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
	void (*register_connector)(struct drm_connector *connector);
	void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
				  struct drm_connector *connector);
	void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);

};

#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)

#define DP_PAYLOAD_LOCAL 1
#define DP_PAYLOAD_REMOTE 2
#define DP_PAYLOAD_DELETE_LOCAL 3

struct drm_dp_payload {
	int payload_state;
	int start_slot;
	int num_slots;
	int vcpi;
};

#define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)

struct drm_dp_mst_topology_state {
	struct drm_private_state base;
	int avail_slots;
	struct drm_atomic_state *state;
	struct drm_dp_mst_topology_mgr *mgr;
};

#define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)

/**
 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
 *
 * This struct represents the toplevel displayport MST topology manager.
 * There should be one instance of this for every MST capable DP connector
 * on the GPU.
 */
struct drm_dp_mst_topology_mgr {
	/**
	 * @base: Base private object for atomic
	 */
	struct drm_private_obj base;

	/**
	 * @dev: device pointer for adding i2c devices etc.
	 */
	struct drm_device *dev;
	/**
	 * @cbs: callbacks for connector addition and destruction.
	 */
	const struct drm_dp_mst_topology_cbs *cbs;
	/**
	 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
	 * in one go.
	 */
	int max_dpcd_transaction_bytes;
	/**
	 * @aux: AUX channel for the DP MST connector this topolgy mgr is
	 * controlling.
	 */
	struct drm_dp_aux *aux;
	/**
	 * @max_payloads: maximum number of payloads the GPU can generate.
	 */
	int max_payloads;
	/**
	 * @conn_base_id: DRM connector ID this mgr is connected to. Only used
	 * to build the MST connector path value.
	 */
	int conn_base_id;

	/**
	 * @down_rep_recv: Message receiver state for down replies. This and
	 * @up_req_recv are only ever access from the work item, which is
	 * serialised.
	 */
	struct drm_dp_sideband_msg_rx down_rep_recv;
	/**
	 * @up_req_recv: Message receiver state for up requests. This and
	 * @down_rep_recv are only ever access from the work item, which is
	 * serialised.
	 */
	struct drm_dp_sideband_msg_rx up_req_recv;

	/**
	 * @lock: protects mst state, primary, dpcd.
	 */
	struct mutex lock;

	/**
	 * @mst_state: If this manager is enabled for an MST capable port. False
	 * if no MST sink/branch devices is connected.
	 */
	bool mst_state;
	/**
	 * @mst_primary: Pointer to the primary/first branch device.
	 */
	struct drm_dp_mst_branch *mst_primary;

	/**
	 * @dpcd: Cache of DPCD for primary port.
	 */
	u8 dpcd[DP_RECEIVER_CAP_SIZE];
	/**
	 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
	 */
	u8 sink_count;
	/**
	 * @pbn_div: PBN to slots divisor.
	 */
	int pbn_div;

	/**
	 * @state: State information for topology manager
	 */
	struct drm_dp_mst_topology_state *state;

	/**
	 * @funcs: Atomic helper callbacks
	 */
	const struct drm_private_state_funcs *funcs;

	/**
	 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
	 * &drm_dp_sideband_msg_tx.state once they are queued
	 */
	struct mutex qlock;
	/**
	 * @tx_msg_downq: List of pending down replies.
	 */
	struct list_head tx_msg_downq;

	/**
	 * @payload_lock: Protect payload information.
	 */
	struct mutex payload_lock;
	/**
	 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
	 * VCPI structure itself is &drm_dp_mst_port.vcpi.
	 */
	struct drm_dp_vcpi **proposed_vcpis;
	/**
	 * @payloads: Array of payloads.
	 */
	struct drm_dp_payload *payloads;
	/**
	 * @payload_mask: Elements of @payloads actually in use. Since
	 * reallocation of active outputs isn't possible gaps can be created by
	 * disabling outputs out of order compared to how they've been enabled.
	 */
	unsigned long payload_mask;
	/**
	 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
	 */
	unsigned long vcpi_mask;

	/**
	 * @tx_waitq: Wait to queue stall for the tx worker.
	 */
	wait_queue_head_t tx_waitq;
	/**
	 * @work: Probe work.
	 */
	struct work_struct work;
	/**
	 * @tx_work: Sideband transmit worker. This can nest within the main
	 * @work worker for each transaction @work launches.
	 */
	struct work_struct tx_work;

	/**
	 * @destroy_connector_list: List of to be destroyed connectors.
	 */
	struct list_head destroy_connector_list;
	/**
	 * @destroy_connector_lock: Protects @connector_list.
	 */
	struct mutex destroy_connector_lock;
	/**
	 * @destroy_connector_work: Work item to destroy connectors. Needed to
	 * avoid locking inversion.
	 */
	struct work_struct destroy_connector_work;
};

int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
				 struct drm_device *dev, struct drm_dp_aux *aux,
				 int max_dpcd_transaction_bytes,
				 int max_payloads, int conn_base_id);

void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);


int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);


int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);


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);

bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
					struct drm_dp_mst_port *port);
struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);


int drm_dp_calc_pbn_mode(int clock, int bpp);


bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
			      struct drm_dp_mst_port *port, int pbn, int slots);

int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);


void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);


void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
				struct drm_dp_mst_port *port);


int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
			   int pbn);


int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);


int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_dump_topology(struct seq_file *m,
			      struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
								    struct drm_dp_mst_topology_mgr *mgr);
int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
				  struct drm_dp_mst_topology_mgr *mgr,
				  struct drm_dp_mst_port *port, int pbn);
int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
				     struct drm_dp_mst_topology_mgr *mgr,
				     int slots);
int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
				 struct drm_dp_mst_port *port, bool power_up);

#endif