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5056 serge 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 
26
#include 
27
 
28
struct drm_dp_mst_branch;
29
 
30
/**
5270 serge 31
 * struct drm_dp_vcpi - Virtual Channel Payload Identifier
5056 serge 32
 * @vcpi: Virtual channel ID.
33
 * @pbn: Payload Bandwidth Number for this channel
34
 * @aligned_pbn: PBN aligned with slot size
35
 * @num_slots: number of slots for this PBN
36
 */
37
struct drm_dp_vcpi {
38
	int vcpi;
39
	int pbn;
40
	int aligned_pbn;
41
	int num_slots;
42
};
43
 
44
/**
45
 * struct drm_dp_mst_port - MST port
46
 * @kref: reference count for this 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
	struct kref kref;
70
 
71
	u8 port_num;
72
	bool input;
73
	bool mcs;
74
	bool ddps;
75
	u8 pdt;
76
	bool ldps;
77
	u8 dpcd_rev;
78
	u8 num_sdp_streams;
79
	u8 num_sdp_stream_sinks;
80
	uint16_t available_pbn;
81
	struct list_head next;
82
	struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
83
	struct drm_dp_aux aux; /* i2c bus for this port? */
84
	struct drm_dp_mst_branch *parent;
85
 
86
	struct drm_dp_vcpi vcpi;
87
	struct drm_connector *connector;
88
	struct drm_dp_mst_topology_mgr *mgr;
5270 serge 89
 
90
	struct edid *cached_edid; /* for DP logical ports - make tiling work */
6936 serge 91
	bool has_audio;
5056 serge 92
};
93
 
94
/**
95
 * struct drm_dp_mst_branch - MST branch device.
96
 * @kref: reference count for this port.
97
 * @rad: Relative Address to talk to this branch device.
98
 * @lct: Link count total to talk to this branch device.
99
 * @num_ports: number of ports on the branch.
100
 * @msg_slots: one bit per transmitted msg slot.
101
 * @ports: linked list of ports on this branch.
102
 * @port_parent: pointer to the port parent, NULL if toplevel.
103
 * @mgr: topology manager for this branch device.
104
 * @tx_slots: transmission slots for this device.
105
 * @last_seqno: last sequence number used to talk to this.
106
 * @link_address_sent: if a link address message has been sent to this device yet.
6336 serge 107
 * @guid: guid for DP 1.2 branch device. port under this branch can be
108
 * identified by port #.
5056 serge 109
 *
110
 * This structure represents an MST branch device, there is one
6336 serge 111
 * primary branch device at the root, along with any other branches connected
112
 * to downstream port of parent branches.
5056 serge 113
 */
114
struct drm_dp_mst_branch {
115
	struct kref kref;
116
	u8 rad[8];
117
	u8 lct;
118
	int num_ports;
119
 
120
	int msg_slots;
121
	struct list_head ports;
122
 
123
	/* list of tx ops queue for this port */
124
	struct drm_dp_mst_port *port_parent;
125
	struct drm_dp_mst_topology_mgr *mgr;
126
 
127
	/* slots are protected by mstb->mgr->qlock */
128
	struct drm_dp_sideband_msg_tx *tx_slots[2];
129
	int last_seqno;
130
	bool link_address_sent;
6336 serge 131
 
132
	/* global unique identifier to identify branch devices */
133
	u8 guid[16];
5056 serge 134
};
135
 
136
 
137
/* sideband msg header - not bit struct */
138
struct drm_dp_sideband_msg_hdr {
139
	u8 lct;
140
	u8 lcr;
141
	u8 rad[8];
142
	bool broadcast;
143
	bool path_msg;
144
	u8 msg_len;
145
	bool somt;
146
	bool eomt;
147
	bool seqno;
148
};
149
 
150
struct drm_dp_nak_reply {
151
	u8 guid[16];
152
	u8 reason;
153
	u8 nak_data;
154
};
155
 
156
struct drm_dp_link_address_ack_reply {
157
	u8 guid[16];
158
	u8 nports;
159
	struct drm_dp_link_addr_reply_port {
160
		bool input_port;
161
		u8 peer_device_type;
162
		u8 port_number;
163
		bool mcs;
164
		bool ddps;
165
		bool legacy_device_plug_status;
166
		u8 dpcd_revision;
167
		u8 peer_guid[16];
168
		u8 num_sdp_streams;
169
		u8 num_sdp_stream_sinks;
170
	} ports[16];
171
};
172
 
173
struct drm_dp_remote_dpcd_read_ack_reply {
174
	u8 port_number;
175
	u8 num_bytes;
176
	u8 bytes[255];
177
};
178
 
179
struct drm_dp_remote_dpcd_write_ack_reply {
180
	u8 port_number;
181
};
182
 
183
struct drm_dp_remote_dpcd_write_nak_reply {
184
	u8 port_number;
185
	u8 reason;
186
	u8 bytes_written_before_failure;
187
};
188
 
189
struct drm_dp_remote_i2c_read_ack_reply {
190
	u8 port_number;
191
	u8 num_bytes;
192
	u8 bytes[255];
193
};
194
 
195
struct drm_dp_remote_i2c_read_nak_reply {
196
	u8 port_number;
197
	u8 nak_reason;
198
	u8 i2c_nak_transaction;
199
};
200
 
201
struct drm_dp_remote_i2c_write_ack_reply {
202
	u8 port_number;
203
};
204
 
205
 
206
struct drm_dp_sideband_msg_rx {
207
	u8 chunk[48];
208
	u8 msg[256];
209
	u8 curchunk_len;
210
	u8 curchunk_idx; /* chunk we are parsing now */
211
	u8 curchunk_hdrlen;
212
	u8 curlen; /* total length of the msg */
213
	bool have_somt;
214
	bool have_eomt;
215
	struct drm_dp_sideband_msg_hdr initial_hdr;
216
};
217
 
6936 serge 218
#define DRM_DP_MAX_SDP_STREAMS 16
5056 serge 219
struct drm_dp_allocate_payload {
220
	u8 port_number;
221
	u8 number_sdp_streams;
222
	u8 vcpi;
223
	u16 pbn;
6936 serge 224
	u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
5056 serge 225
};
226
 
227
struct drm_dp_allocate_payload_ack_reply {
228
	u8 port_number;
229
	u8 vcpi;
230
	u16 allocated_pbn;
231
};
232
 
233
struct drm_dp_connection_status_notify {
234
	u8 guid[16];
235
	u8 port_number;
236
	bool legacy_device_plug_status;
237
	bool displayport_device_plug_status;
238
	bool message_capability_status;
239
	bool input_port;
240
	u8 peer_device_type;
241
};
242
 
243
struct drm_dp_remote_dpcd_read {
244
	u8 port_number;
245
	u32 dpcd_address;
246
	u8 num_bytes;
247
};
248
 
249
struct drm_dp_remote_dpcd_write {
250
	u8 port_number;
251
	u32 dpcd_address;
252
	u8 num_bytes;
253
	u8 *bytes;
254
};
255
 
6082 serge 256
#define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
5056 serge 257
struct drm_dp_remote_i2c_read {
258
	u8 num_transactions;
259
	u8 port_number;
260
	struct {
261
		u8 i2c_dev_id;
262
		u8 num_bytes;
263
		u8 *bytes;
264
		u8 no_stop_bit;
265
		u8 i2c_transaction_delay;
6082 serge 266
	} transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
5056 serge 267
	u8 read_i2c_device_id;
268
	u8 num_bytes_read;
269
};
270
 
271
struct drm_dp_remote_i2c_write {
272
	u8 port_number;
273
	u8 write_i2c_device_id;
274
	u8 num_bytes;
275
	u8 *bytes;
276
};
277
 
278
/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
279
struct drm_dp_port_number_req {
280
	u8 port_number;
281
};
282
 
283
struct drm_dp_enum_path_resources_ack_reply {
284
	u8 port_number;
285
	u16 full_payload_bw_number;
286
	u16 avail_payload_bw_number;
287
};
288
 
289
/* covers POWER_DOWN_PHY, POWER_UP_PHY */
290
struct drm_dp_port_number_rep {
291
	u8 port_number;
292
};
293
 
294
struct drm_dp_query_payload {
295
	u8 port_number;
296
	u8 vcpi;
297
};
298
 
299
struct drm_dp_resource_status_notify {
300
	u8 port_number;
301
	u8 guid[16];
302
	u16 available_pbn;
303
};
304
 
305
struct drm_dp_query_payload_ack_reply {
306
	u8 port_number;
307
	u8 allocated_pbn;
308
};
309
 
310
struct drm_dp_sideband_msg_req_body {
311
	u8 req_type;
312
	union ack_req {
313
		struct drm_dp_connection_status_notify conn_stat;
314
		struct drm_dp_port_number_req port_num;
315
		struct drm_dp_resource_status_notify resource_stat;
316
 
317
		struct drm_dp_query_payload query_payload;
318
		struct drm_dp_allocate_payload allocate_payload;
319
 
320
		struct drm_dp_remote_dpcd_read dpcd_read;
321
		struct drm_dp_remote_dpcd_write dpcd_write;
322
 
323
		struct drm_dp_remote_i2c_read i2c_read;
324
		struct drm_dp_remote_i2c_write i2c_write;
325
	} u;
326
};
327
 
328
struct drm_dp_sideband_msg_reply_body {
329
	u8 reply_type;
330
	u8 req_type;
331
	union ack_replies {
332
		struct drm_dp_nak_reply nak;
333
		struct drm_dp_link_address_ack_reply link_addr;
334
		struct drm_dp_port_number_rep port_number;
335
 
336
		struct drm_dp_enum_path_resources_ack_reply path_resources;
337
		struct drm_dp_allocate_payload_ack_reply allocate_payload;
338
		struct drm_dp_query_payload_ack_reply query_payload;
339
 
340
		struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
341
		struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
342
		struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
343
 
344
		struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
345
		struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
346
		struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
347
	} u;
348
};
349
 
350
/* msg is queued to be put into a slot */
351
#define DRM_DP_SIDEBAND_TX_QUEUED 0
352
/* msg has started transmitting on a slot - still on msgq */
353
#define DRM_DP_SIDEBAND_TX_START_SEND 1
354
/* msg has finished transmitting on a slot - removed from msgq only in slot */
355
#define DRM_DP_SIDEBAND_TX_SENT 2
356
/* msg has received a response - removed from slot */
357
#define DRM_DP_SIDEBAND_TX_RX 3
358
#define DRM_DP_SIDEBAND_TX_TIMEOUT 4
359
 
360
struct drm_dp_sideband_msg_tx {
361
	u8 msg[256];
362
	u8 chunk[48];
363
	u8 cur_offset;
364
	u8 cur_len;
365
	struct drm_dp_mst_branch *dst;
366
	struct list_head next;
367
	int seqno;
368
	int state;
369
	bool path_msg;
370
	struct drm_dp_sideband_msg_reply_body reply;
371
};
372
 
373
/* sideband msg handler */
374
struct drm_dp_mst_topology_mgr;
375
struct drm_dp_mst_topology_cbs {
376
	/* create a connector for a port */
5270 serge 377
	struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
6082 serge 378
	void (*register_connector)(struct drm_connector *connector);
5056 serge 379
	void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
380
				  struct drm_connector *connector);
381
	void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
382
 
383
};
384
 
385
#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
386
 
387
#define DP_PAYLOAD_LOCAL 1
388
#define DP_PAYLOAD_REMOTE 2
389
#define DP_PAYLOAD_DELETE_LOCAL 3
390
 
391
struct drm_dp_payload {
392
	int payload_state;
393
	int start_slot;
394
	int num_slots;
5270 serge 395
	int vcpi;
5056 serge 396
};
397
 
398
/**
399
 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
400
 * @dev: device pointer for adding i2c devices etc.
401
 * @cbs: callbacks for connector addition and destruction.
402
 * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
403
 * @aux: aux channel for the DP connector.
404
 * @max_payloads: maximum number of payloads the GPU can generate.
405
 * @conn_base_id: DRM connector ID this mgr is connected to.
406
 * @down_rep_recv: msg receiver state for down replies.
407
 * @up_req_recv: msg receiver state for up requests.
6336 serge 408
 * @lock: protects mst state, primary, dpcd.
5056 serge 409
 * @mst_state: if this manager is enabled for an MST capable port.
410
 * @mst_primary: pointer to the primary branch device.
411
 * @dpcd: cache of DPCD for primary port.
412
 * @pbn_div: PBN to slots divisor.
413
 *
414
 * This struct represents the toplevel displayport MST topology manager.
415
 * There should be one instance of this for every MST capable DP connector
416
 * on the GPU.
417
 */
418
struct drm_dp_mst_topology_mgr {
419
 
420
	struct device *dev;
6936 serge 421
	const struct drm_dp_mst_topology_cbs *cbs;
5056 serge 422
	int max_dpcd_transaction_bytes;
423
	struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
424
	int max_payloads;
425
	int conn_base_id;
426
 
427
	/* only ever accessed from the workqueue - which should be serialised */
428
	struct drm_dp_sideband_msg_rx down_rep_recv;
429
	struct drm_dp_sideband_msg_rx up_req_recv;
430
 
431
	/* pointer to info about the initial MST device */
6336 serge 432
	struct mutex lock; /* protects mst_state + primary + dpcd */
5056 serge 433
 
434
	bool mst_state;
435
	struct drm_dp_mst_branch *mst_primary;
6336 serge 436
 
5056 serge 437
	u8 dpcd[DP_RECEIVER_CAP_SIZE];
438
	u8 sink_count;
439
	int pbn_div;
440
	int total_slots;
441
	int avail_slots;
442
	int total_pbn;
443
 
444
	/* messages to be transmitted */
445
	/* qlock protects the upq/downq and in_progress,
446
	   the mstb tx_slots and txmsg->state once they are queued */
6082 serge 447
	struct mutex qlock;
5056 serge 448
	struct list_head tx_msg_downq;
449
	bool tx_down_in_progress;
450
 
451
	/* payload info + lock for it */
452
	struct mutex payload_lock;
453
	struct drm_dp_vcpi **proposed_vcpis;
454
	struct drm_dp_payload *payloads;
455
	unsigned long payload_mask;
5270 serge 456
	unsigned long vcpi_mask;
5056 serge 457
 
458
	wait_queue_head_t tx_waitq;
459
	struct work_struct work;
460
 
461
	struct work_struct tx_work;
6082 serge 462
 
463
	struct list_head destroy_connector_list;
464
	struct mutex destroy_connector_lock;
465
	struct work_struct destroy_connector_work;
5056 serge 466
};
467
 
468
int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);
469
 
470
void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
471
 
472
 
473
int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
474
 
475
 
476
int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
477
 
478
 
5270 serge 479
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);
5056 serge 480
 
6936 serge 481
bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
482
					struct drm_dp_mst_port *port);
5056 serge 483
struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
484
 
485
 
486
int drm_dp_calc_pbn_mode(int clock, int bpp);
487
 
488
 
489
bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
490
 
6082 serge 491
int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
5056 serge 492
 
6082 serge 493
 
5056 serge 494
void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
495
 
496
 
497
void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
498
				struct drm_dp_mst_port *port);
499
 
500
 
501
int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
502
			   int pbn);
503
 
504
 
505
int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
506
 
507
 
508
int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
509
 
510
int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
511
 
512
void drm_dp_mst_dump_topology(struct seq_file *m,
513
			      struct drm_dp_mst_topology_mgr *mgr);
514
 
515
void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
516
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
517
#endif