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