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Input: hilkbd - Add casts to HP9000/300 I/O accessors
[linux/fpc-iii.git] / drivers / gpu / drm / drm_dp_mst_topology.c
blob658830620ca3668a706817ce5efb1805d32be9b0
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
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/init.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/seq_file.h>
29 #include <linux/i2c.h>
30 #include <drm/drm_dp_mst_helper.h>
31 #include <drm/drmP.h>
32
33 #include <drm/drm_fixed.h>
34 #include <drm/drm_atomic.h>
35 #include <drm/drm_atomic_helper.h>
36
37 /**
38 * DOC: dp mst helper
39 *
40 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
41 * protocol. The helpers contain a topology manager and bandwidth manager.
42 * The helpers encapsulate the sending and received of sideband msgs.
43 */
44 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
45 char *buf);
46 static int test_calc_pbn_mode(void);
47
48 static void drm_dp_put_port(struct drm_dp_mst_port *port);
49
50 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
51 int id,
52 struct drm_dp_payload *payload);
53
54 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
55 struct drm_dp_mst_port *port,
56 int offset, int size, u8 *bytes);
57
58 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
59 struct drm_dp_mst_branch *mstb);
60 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
61 struct drm_dp_mst_branch *mstb,
62 struct drm_dp_mst_port *port);
63 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
64 u8 *guid);
65
66 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
67 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
68 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
69 /* sideband msg handling */
70 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
71 {
72 u8 bitmask = 0x80;
73 u8 bitshift = 7;
74 u8 array_index = 0;
75 int number_of_bits = num_nibbles * 4;
76 u8 remainder = 0;
77
78 while (number_of_bits != 0) {
79 number_of_bits--;
80 remainder <<= 1;
81 remainder |= (data[array_index] & bitmask) >> bitshift;
82 bitmask >>= 1;
83 bitshift--;
84 if (bitmask == 0) {
85 bitmask = 0x80;
86 bitshift = 7;
87 array_index++;
88 }
89 if ((remainder & 0x10) == 0x10)
90 remainder ^= 0x13;
91 }
92
93 number_of_bits = 4;
94 while (number_of_bits != 0) {
95 number_of_bits--;
96 remainder <<= 1;
97 if ((remainder & 0x10) != 0)
98 remainder ^= 0x13;
99 }
100
101 return remainder;
102 }
103
104 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
105 {
106 u8 bitmask = 0x80;
107 u8 bitshift = 7;
108 u8 array_index = 0;
109 int number_of_bits = number_of_bytes * 8;
110 u16 remainder = 0;
111
112 while (number_of_bits != 0) {
113 number_of_bits--;
114 remainder <<= 1;
115 remainder |= (data[array_index] & bitmask) >> bitshift;
116 bitmask >>= 1;
117 bitshift--;
118 if (bitmask == 0) {
119 bitmask = 0x80;
120 bitshift = 7;
121 array_index++;
122 }
123 if ((remainder & 0x100) == 0x100)
124 remainder ^= 0xd5;
125 }
126
127 number_of_bits = 8;
128 while (number_of_bits != 0) {
129 number_of_bits--;
130 remainder <<= 1;
131 if ((remainder & 0x100) != 0)
132 remainder ^= 0xd5;
133 }
134
135 return remainder & 0xff;
136 }
137 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
138 {
139 u8 size = 3;
140 size += (hdr->lct / 2);
141 return size;
142 }
143
144 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
145 u8 *buf, int *len)
146 {
147 int idx = 0;
148 int i;
149 u8 crc4;
150 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
151 for (i = 0; i < (hdr->lct / 2); i++)
152 buf[idx++] = hdr->rad[i];
153 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
154 (hdr->msg_len & 0x3f);
155 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
156
157 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
158 buf[idx - 1] |= (crc4 & 0xf);
159
160 *len = idx;
161 }
162
163 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
164 u8 *buf, int buflen, u8 *hdrlen)
165 {
166 u8 crc4;
167 u8 len;
168 int i;
169 u8 idx;
170 if (buf[0] == 0)
171 return false;
172 len = 3;
173 len += ((buf[0] & 0xf0) >> 4) / 2;
174 if (len > buflen)
175 return false;
176 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
177
178 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
179 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
180 return false;
181 }
182
183 hdr->lct = (buf[0] & 0xf0) >> 4;
184 hdr->lcr = (buf[0] & 0xf);
185 idx = 1;
186 for (i = 0; i < (hdr->lct / 2); i++)
187 hdr->rad[i] = buf[idx++];
188 hdr->broadcast = (buf[idx] >> 7) & 0x1;
189 hdr->path_msg = (buf[idx] >> 6) & 0x1;
190 hdr->msg_len = buf[idx] & 0x3f;
191 idx++;
192 hdr->somt = (buf[idx] >> 7) & 0x1;
193 hdr->eomt = (buf[idx] >> 6) & 0x1;
194 hdr->seqno = (buf[idx] >> 4) & 0x1;
195 idx++;
196 *hdrlen = idx;
197 return true;
198 }
199
200 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
201 struct drm_dp_sideband_msg_tx *raw)
202 {
203 int idx = 0;
204 int i;
205 u8 *buf = raw->msg;
206 buf[idx++] = req->req_type & 0x7f;
207
208 switch (req->req_type) {
209 case DP_ENUM_PATH_RESOURCES:
210 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
211 idx++;
212 break;
213 case DP_ALLOCATE_PAYLOAD:
214 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
215 (req->u.allocate_payload.number_sdp_streams & 0xf);
216 idx++;
217 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
218 idx++;
219 buf[idx] = (req->u.allocate_payload.pbn >> 8);
220 idx++;
221 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
222 idx++;
223 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
224 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
225 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
226 idx++;
227 }
228 if (req->u.allocate_payload.number_sdp_streams & 1) {
229 i = req->u.allocate_payload.number_sdp_streams - 1;
230 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
231 idx++;
232 }
233 break;
234 case DP_QUERY_PAYLOAD:
235 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
236 idx++;
237 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
238 idx++;
239 break;
240 case DP_REMOTE_DPCD_READ:
241 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
242 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
243 idx++;
244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
245 idx++;
246 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
247 idx++;
248 buf[idx] = (req->u.dpcd_read.num_bytes);
249 idx++;
250 break;
251
252 case DP_REMOTE_DPCD_WRITE:
253 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
254 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
255 idx++;
256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
257 idx++;
258 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
259 idx++;
260 buf[idx] = (req->u.dpcd_write.num_bytes);
261 idx++;
262 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
263 idx += req->u.dpcd_write.num_bytes;
264 break;
265 case DP_REMOTE_I2C_READ:
266 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
267 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
268 idx++;
269 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
270 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
271 idx++;
272 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
273 idx++;
274 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
275 idx += req->u.i2c_read.transactions[i].num_bytes;
276
277 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
278 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
279 idx++;
280 }
281 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
282 idx++;
283 buf[idx] = (req->u.i2c_read.num_bytes_read);
284 idx++;
285 break;
286
287 case DP_REMOTE_I2C_WRITE:
288 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
289 idx++;
290 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
291 idx++;
292 buf[idx] = (req->u.i2c_write.num_bytes);
293 idx++;
294 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
295 idx += req->u.i2c_write.num_bytes;
296 break;
297
298 case DP_POWER_DOWN_PHY:
299 case DP_POWER_UP_PHY:
300 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
301 idx++;
302 break;
303 }
304 raw->cur_len = idx;
305 }
306
307 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
308 {
309 u8 crc4;
310 crc4 = drm_dp_msg_data_crc4(msg, len);
311 msg[len] = crc4;
312 }
313
314 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
315 struct drm_dp_sideband_msg_tx *raw)
316 {
317 int idx = 0;
318 u8 *buf = raw->msg;
319
320 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
321
322 raw->cur_len = idx;
323 }
324
325 /* this adds a chunk of msg to the builder to get the final msg */
326 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
327 u8 *replybuf, u8 replybuflen, bool hdr)
328 {
329 int ret;
330 u8 crc4;
331
332 if (hdr) {
333 u8 hdrlen;
334 struct drm_dp_sideband_msg_hdr recv_hdr;
335 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
336 if (ret == false) {
337 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
338 return false;
339 }
340
341 /*
342 * ignore out-of-order messages or messages that are part of a
343 * failed transaction
344 */
345 if (!recv_hdr.somt && !msg->have_somt)
346 return false;
347
348 /* get length contained in this portion */
349 msg->curchunk_len = recv_hdr.msg_len;
350 msg->curchunk_hdrlen = hdrlen;
351
352 /* we have already gotten an somt - don't bother parsing */
353 if (recv_hdr.somt && msg->have_somt)
354 return false;
355
356 if (recv_hdr.somt) {
357 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
358 msg->have_somt = true;
359 }
360 if (recv_hdr.eomt)
361 msg->have_eomt = true;
362
363 /* copy the bytes for the remainder of this header chunk */
364 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
365 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
366 } else {
367 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
368 msg->curchunk_idx += replybuflen;
369 }
370
371 if (msg->curchunk_idx >= msg->curchunk_len) {
372 /* do CRC */
373 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
374 /* copy chunk into bigger msg */
375 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
376 msg->curlen += msg->curchunk_len - 1;
377 }
378 return true;
379 }
380
381 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
382 struct drm_dp_sideband_msg_reply_body *repmsg)
383 {
384 int idx = 1;
385 int i;
386 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
387 idx += 16;
388 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
389 idx++;
390 if (idx > raw->curlen)
391 goto fail_len;
392 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
393 if (raw->msg[idx] & 0x80)
394 repmsg->u.link_addr.ports[i].input_port = 1;
395
396 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
397 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
398
399 idx++;
400 if (idx > raw->curlen)
401 goto fail_len;
402 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
403 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
404 if (repmsg->u.link_addr.ports[i].input_port == 0)
405 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
406 idx++;
407 if (idx > raw->curlen)
408 goto fail_len;
409 if (repmsg->u.link_addr.ports[i].input_port == 0) {
410 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
411 idx++;
412 if (idx > raw->curlen)
413 goto fail_len;
414 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
415 idx += 16;
416 if (idx > raw->curlen)
417 goto fail_len;
418 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
419 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
420 idx++;
421
422 }
423 if (idx > raw->curlen)
424 goto fail_len;
425 }
426
427 return true;
428 fail_len:
429 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
430 return false;
431 }
432
433 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
434 struct drm_dp_sideband_msg_reply_body *repmsg)
435 {
436 int idx = 1;
437 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
438 idx++;
439 if (idx > raw->curlen)
440 goto fail_len;
441 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
442 if (idx > raw->curlen)
443 goto fail_len;
444
445 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
446 return true;
447 fail_len:
448 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
449 return false;
450 }
451
452 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
453 struct drm_dp_sideband_msg_reply_body *repmsg)
454 {
455 int idx = 1;
456 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
457 idx++;
458 if (idx > raw->curlen)
459 goto fail_len;
460 return true;
461 fail_len:
462 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
463 return false;
464 }
465
466 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
467 struct drm_dp_sideband_msg_reply_body *repmsg)
468 {
469 int idx = 1;
470
471 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
472 idx++;
473 if (idx > raw->curlen)
474 goto fail_len;
475 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
476 idx++;
477 /* TODO check */
478 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
479 return true;
480 fail_len:
481 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
482 return false;
483 }
484
485 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
486 struct drm_dp_sideband_msg_reply_body *repmsg)
487 {
488 int idx = 1;
489 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
490 idx++;
491 if (idx > raw->curlen)
492 goto fail_len;
493 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
494 idx += 2;
495 if (idx > raw->curlen)
496 goto fail_len;
497 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
498 idx += 2;
499 if (idx > raw->curlen)
500 goto fail_len;
501 return true;
502 fail_len:
503 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
504 return false;
505 }
506
507 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
508 struct drm_dp_sideband_msg_reply_body *repmsg)
509 {
510 int idx = 1;
511 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
512 idx++;
513 if (idx > raw->curlen)
514 goto fail_len;
515 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
516 idx++;
517 if (idx > raw->curlen)
518 goto fail_len;
519 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
520 idx += 2;
521 if (idx > raw->curlen)
522 goto fail_len;
523 return true;
524 fail_len:
525 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
526 return false;
527 }
528
529 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
530 struct drm_dp_sideband_msg_reply_body *repmsg)
531 {
532 int idx = 1;
533 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
534 idx++;
535 if (idx > raw->curlen)
536 goto fail_len;
537 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
538 idx += 2;
539 if (idx > raw->curlen)
540 goto fail_len;
541 return true;
542 fail_len:
543 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
544 return false;
545 }
546
547 static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw,
548 struct drm_dp_sideband_msg_reply_body *repmsg)
549 {
550 int idx = 1;
551
552 repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf;
553 idx++;
554 if (idx > raw->curlen) {
555 DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n",
556 idx, raw->curlen);
557 return false;
558 }
559 return true;
560 }
561
562 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
563 struct drm_dp_sideband_msg_reply_body *msg)
564 {
565 memset(msg, 0, sizeof(*msg));
566 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
567 msg->req_type = (raw->msg[0] & 0x7f);
568
569 if (msg->reply_type) {
570 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
571 msg->u.nak.reason = raw->msg[17];
572 msg->u.nak.nak_data = raw->msg[18];
573 return false;
574 }
575
576 switch (msg->req_type) {
577 case DP_LINK_ADDRESS:
578 return drm_dp_sideband_parse_link_address(raw, msg);
579 case DP_QUERY_PAYLOAD:
580 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
581 case DP_REMOTE_DPCD_READ:
582 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
583 case DP_REMOTE_DPCD_WRITE:
584 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
585 case DP_REMOTE_I2C_READ:
586 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
587 case DP_ENUM_PATH_RESOURCES:
588 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
589 case DP_ALLOCATE_PAYLOAD:
590 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
591 case DP_POWER_DOWN_PHY:
592 case DP_POWER_UP_PHY:
593 return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg);
594 default:
595 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
596 return false;
597 }
598 }
599
600 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
601 struct drm_dp_sideband_msg_req_body *msg)
602 {
603 int idx = 1;
604
605 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
606 idx++;
607 if (idx > raw->curlen)
608 goto fail_len;
609
610 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
611 idx += 16;
612 if (idx > raw->curlen)
613 goto fail_len;
614
615 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
616 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
617 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
618 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
619 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
620 idx++;
621 return true;
622 fail_len:
623 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
624 return false;
625 }
626
627 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
628 struct drm_dp_sideband_msg_req_body *msg)
629 {
630 int idx = 1;
631
632 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
633 idx++;
634 if (idx > raw->curlen)
635 goto fail_len;
636
637 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
638 idx += 16;
639 if (idx > raw->curlen)
640 goto fail_len;
641
642 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
643 idx++;
644 return true;
645 fail_len:
646 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
647 return false;
648 }
649
650 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
651 struct drm_dp_sideband_msg_req_body *msg)
652 {
653 memset(msg, 0, sizeof(*msg));
654 msg->req_type = (raw->msg[0] & 0x7f);
655
656 switch (msg->req_type) {
657 case DP_CONNECTION_STATUS_NOTIFY:
658 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
659 case DP_RESOURCE_STATUS_NOTIFY:
660 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
661 default:
662 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
663 return false;
664 }
665 }
666
667 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
668 {
669 struct drm_dp_sideband_msg_req_body req;
670
671 req.req_type = DP_REMOTE_DPCD_WRITE;
672 req.u.dpcd_write.port_number = port_num;
673 req.u.dpcd_write.dpcd_address = offset;
674 req.u.dpcd_write.num_bytes = num_bytes;
675 req.u.dpcd_write.bytes = bytes;
676 drm_dp_encode_sideband_req(&req, msg);
677
678 return 0;
679 }
680
681 static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
682 {
683 struct drm_dp_sideband_msg_req_body req;
684
685 req.req_type = DP_LINK_ADDRESS;
686 drm_dp_encode_sideband_req(&req, msg);
687 return 0;
688 }
689
690 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
691 {
692 struct drm_dp_sideband_msg_req_body req;
693
694 req.req_type = DP_ENUM_PATH_RESOURCES;
695 req.u.port_num.port_number = port_num;
696 drm_dp_encode_sideband_req(&req, msg);
697 msg->path_msg = true;
698 return 0;
699 }
700
701 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
702 u8 vcpi, uint16_t pbn,
703 u8 number_sdp_streams,
704 u8 *sdp_stream_sink)
705 {
706 struct drm_dp_sideband_msg_req_body req;
707 memset(&req, 0, sizeof(req));
708 req.req_type = DP_ALLOCATE_PAYLOAD;
709 req.u.allocate_payload.port_number = port_num;
710 req.u.allocate_payload.vcpi = vcpi;
711 req.u.allocate_payload.pbn = pbn;
712 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
713 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
714 number_sdp_streams);
715 drm_dp_encode_sideband_req(&req, msg);
716 msg->path_msg = true;
717 return 0;
718 }
719
720 static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
721 int port_num, bool power_up)
722 {
723 struct drm_dp_sideband_msg_req_body req;
724
725 if (power_up)
726 req.req_type = DP_POWER_UP_PHY;
727 else
728 req.req_type = DP_POWER_DOWN_PHY;
729
730 req.u.port_num.port_number = port_num;
731 drm_dp_encode_sideband_req(&req, msg);
732 msg->path_msg = true;
733 return 0;
734 }
735
736 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
737 struct drm_dp_vcpi *vcpi)
738 {
739 int ret, vcpi_ret;
740
741 mutex_lock(&mgr->payload_lock);
742 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
743 if (ret > mgr->max_payloads) {
744 ret = -EINVAL;
745 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
746 goto out_unlock;
747 }
748
749 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
750 if (vcpi_ret > mgr->max_payloads) {
751 ret = -EINVAL;
752 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
753 goto out_unlock;
754 }
755
756 set_bit(ret, &mgr->payload_mask);
757 set_bit(vcpi_ret, &mgr->vcpi_mask);
758 vcpi->vcpi = vcpi_ret + 1;
759 mgr->proposed_vcpis[ret - 1] = vcpi;
760 out_unlock:
761 mutex_unlock(&mgr->payload_lock);
762 return ret;
763 }
764
765 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
766 int vcpi)
767 {
768 int i;
769 if (vcpi == 0)
770 return;
771
772 mutex_lock(&mgr->payload_lock);
773 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
774 clear_bit(vcpi - 1, &mgr->vcpi_mask);
775
776 for (i = 0; i < mgr->max_payloads; i++) {
777 if (mgr->proposed_vcpis[i])
778 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
779 mgr->proposed_vcpis[i] = NULL;
780 clear_bit(i + 1, &mgr->payload_mask);
781 }
782 }
783 mutex_unlock(&mgr->payload_lock);
784 }
785
786 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
787 struct drm_dp_sideband_msg_tx *txmsg)
788 {
789 unsigned int state;
790
791 /*
792 * All updates to txmsg->state are protected by mgr->qlock, and the two
793 * cases we check here are terminal states. For those the barriers
794 * provided by the wake_up/wait_event pair are enough.
795 */
796 state = READ_ONCE(txmsg->state);
797 return (state == DRM_DP_SIDEBAND_TX_RX ||
798 state == DRM_DP_SIDEBAND_TX_TIMEOUT);
799 }
800
801 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
802 struct drm_dp_sideband_msg_tx *txmsg)
803 {
804 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
805 int ret;
806
807 ret = wait_event_timeout(mgr->tx_waitq,
808 check_txmsg_state(mgr, txmsg),
809 (4 * HZ));
810 mutex_lock(&mstb->mgr->qlock);
811 if (ret > 0) {
812 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
813 ret = -EIO;
814 goto out;
815 }
816 } else {
817 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
818
819 /* dump some state */
820 ret = -EIO;
821
822 /* remove from q */
823 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
824 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
825 list_del(&txmsg->next);
826 }
827
828 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
829 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
830 mstb->tx_slots[txmsg->seqno] = NULL;
831 }
832 }
833 out:
834 mutex_unlock(&mgr->qlock);
835
836 return ret;
837 }
838
839 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
840 {
841 struct drm_dp_mst_branch *mstb;
842
843 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
844 if (!mstb)
845 return NULL;
846
847 mstb->lct = lct;
848 if (lct > 1)
849 memcpy(mstb->rad, rad, lct / 2);
850 INIT_LIST_HEAD(&mstb->ports);
851 kref_init(&mstb->kref);
852 return mstb;
853 }
854
855 static void drm_dp_free_mst_port(struct kref *kref);
856
857 static void drm_dp_free_mst_branch_device(struct kref *kref)
858 {
859 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
860 if (mstb->port_parent) {
861 if (list_empty(&mstb->port_parent->next))
862 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
863 }
864 kfree(mstb);
865 }
866
867 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
868 {
869 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
870 struct drm_dp_mst_port *port, *tmp;
871 bool wake_tx = false;
872
873 /*
874 * init kref again to be used by ports to remove mst branch when it is
875 * not needed anymore
876 */
877 kref_init(kref);
878
879 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
880 kref_get(&mstb->port_parent->kref);
881
882 /*
883 * destroy all ports - don't need lock
884 * as there are no more references to the mst branch
885 * device at this point.
886 */
887 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
888 list_del(&port->next);
889 drm_dp_put_port(port);
890 }
891
892 /* drop any tx slots msg */
893 mutex_lock(&mstb->mgr->qlock);
894 if (mstb->tx_slots[0]) {
895 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
896 mstb->tx_slots[0] = NULL;
897 wake_tx = true;
898 }
899 if (mstb->tx_slots[1]) {
900 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
901 mstb->tx_slots[1] = NULL;
902 wake_tx = true;
903 }
904 mutex_unlock(&mstb->mgr->qlock);
905
906 if (wake_tx)
907 wake_up_all(&mstb->mgr->tx_waitq);
908
909 kref_put(kref, drm_dp_free_mst_branch_device);
910 }
911
912 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
913 {
914 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
915 }
916
917
918 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
919 {
920 struct drm_dp_mst_branch *mstb;
921
922 switch (old_pdt) {
923 case DP_PEER_DEVICE_DP_LEGACY_CONV:
924 case DP_PEER_DEVICE_SST_SINK:
925 /* remove i2c over sideband */
926 drm_dp_mst_unregister_i2c_bus(&port->aux);
927 break;
928 case DP_PEER_DEVICE_MST_BRANCHING:
929 mstb = port->mstb;
930 port->mstb = NULL;
931 drm_dp_put_mst_branch_device(mstb);
932 break;
933 }
934 }
935
936 static void drm_dp_destroy_port(struct kref *kref)
937 {
938 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
939 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
940
941 if (!port->input) {
942 port->vcpi.num_slots = 0;
943
944 kfree(port->cached_edid);
945
946 /*
947 * The only time we don't have a connector
948 * on an output port is if the connector init
949 * fails.
950 */
951 if (port->connector) {
952 /* we can't destroy the connector here, as
953 * we might be holding the mode_config.mutex
954 * from an EDID retrieval */
955
956 mutex_lock(&mgr->destroy_connector_lock);
957 kref_get(&port->parent->kref);
958 list_add(&port->next, &mgr->destroy_connector_list);
959 mutex_unlock(&mgr->destroy_connector_lock);
960 schedule_work(&mgr->destroy_connector_work);
961 return;
962 }
963 /* no need to clean up vcpi
964 * as if we have no connector we never setup a vcpi */
965 drm_dp_port_teardown_pdt(port, port->pdt);
966 port->pdt = DP_PEER_DEVICE_NONE;
967 }
968 kfree(port);
969 }
970
971 static void drm_dp_put_port(struct drm_dp_mst_port *port)
972 {
973 kref_put(&port->kref, drm_dp_destroy_port);
974 }
975
976 static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find)
977 {
978 struct drm_dp_mst_port *port;
979 struct drm_dp_mst_branch *rmstb;
980 if (to_find == mstb) {
981 kref_get(&mstb->kref);
982 return mstb;
983 }
984 list_for_each_entry(port, &mstb->ports, next) {
985 if (port->mstb) {
986 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
987 if (rmstb)
988 return rmstb;
989 }
990 }
991 return NULL;
992 }
993
994 static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
995 {
996 struct drm_dp_mst_branch *rmstb = NULL;
997 mutex_lock(&mgr->lock);
998 if (mgr->mst_primary)
999 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
1000 mutex_unlock(&mgr->lock);
1001 return rmstb;
1002 }
1003
1004 static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find)
1005 {
1006 struct drm_dp_mst_port *port, *mport;
1007
1008 list_for_each_entry(port, &mstb->ports, next) {
1009 if (port == to_find) {
1010 kref_get(&port->kref);
1011 return port;
1012 }
1013 if (port->mstb) {
1014 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
1015 if (mport)
1016 return mport;
1017 }
1018 }
1019 return NULL;
1020 }
1021
1022 static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
1023 {
1024 struct drm_dp_mst_port *rport = NULL;
1025 mutex_lock(&mgr->lock);
1026 if (mgr->mst_primary)
1027 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
1028 mutex_unlock(&mgr->lock);
1029 return rport;
1030 }
1031
1032 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
1033 {
1034 struct drm_dp_mst_port *port;
1035
1036 list_for_each_entry(port, &mstb->ports, next) {
1037 if (port->port_num == port_num) {
1038 kref_get(&port->kref);
1039 return port;
1040 }
1041 }
1042
1043 return NULL;
1044 }
1045
1046 /*
1047 * calculate a new RAD for this MST branch device
1048 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1049 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1050 */
1051 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1052 u8 *rad)
1053 {
1054 int parent_lct = port->parent->lct;
1055 int shift = 4;
1056 int idx = (parent_lct - 1) / 2;
1057 if (parent_lct > 1) {
1058 memcpy(rad, port->parent->rad, idx + 1);
1059 shift = (parent_lct % 2) ? 4 : 0;
1060 } else
1061 rad[0] = 0;
1062
1063 rad[idx] |= port->port_num << shift;
1064 return parent_lct + 1;
1065 }
1066
1067 /*
1068 * return sends link address for new mstb
1069 */
1070 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1071 {
1072 int ret;
1073 u8 rad[6], lct;
1074 bool send_link = false;
1075 switch (port->pdt) {
1076 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1077 case DP_PEER_DEVICE_SST_SINK:
1078 /* add i2c over sideband */
1079 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1080 break;
1081 case DP_PEER_DEVICE_MST_BRANCHING:
1082 lct = drm_dp_calculate_rad(port, rad);
1083
1084 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1085 if (port->mstb) {
1086 port->mstb->mgr = port->mgr;
1087 port->mstb->port_parent = port;
1088
1089 send_link = true;
1090 }
1091 break;
1092 }
1093 return send_link;
1094 }
1095
1096 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1097 {
1098 int ret;
1099
1100 memcpy(mstb->guid, guid, 16);
1101
1102 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1103 if (mstb->port_parent) {
1104 ret = drm_dp_send_dpcd_write(
1105 mstb->mgr,
1106 mstb->port_parent,
1107 DP_GUID,
1108 16,
1109 mstb->guid);
1110 } else {
1111
1112 ret = drm_dp_dpcd_write(
1113 mstb->mgr->aux,
1114 DP_GUID,
1115 mstb->guid,
1116 16);
1117 }
1118 }
1119 }
1120
1121 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1122 int pnum,
1123 char *proppath,
1124 size_t proppath_size)
1125 {
1126 int i;
1127 char temp[8];
1128 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1129 for (i = 0; i < (mstb->lct - 1); i++) {
1130 int shift = (i % 2) ? 0 : 4;
1131 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1132 snprintf(temp, sizeof(temp), "-%d", port_num);
1133 strlcat(proppath, temp, proppath_size);
1134 }
1135 snprintf(temp, sizeof(temp), "-%d", pnum);
1136 strlcat(proppath, temp, proppath_size);
1137 }
1138
1139 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1140 struct drm_device *dev,
1141 struct drm_dp_link_addr_reply_port *port_msg)
1142 {
1143 struct drm_dp_mst_port *port;
1144 bool ret;
1145 bool created = false;
1146 int old_pdt = 0;
1147 int old_ddps = 0;
1148 port = drm_dp_get_port(mstb, port_msg->port_number);
1149 if (!port) {
1150 port = kzalloc(sizeof(*port), GFP_KERNEL);
1151 if (!port)
1152 return;
1153 kref_init(&port->kref);
1154 port->parent = mstb;
1155 port->port_num = port_msg->port_number;
1156 port->mgr = mstb->mgr;
1157 port->aux.name = "DPMST";
1158 port->aux.dev = dev->dev;
1159 created = true;
1160 } else {
1161 old_pdt = port->pdt;
1162 old_ddps = port->ddps;
1163 }
1164
1165 port->pdt = port_msg->peer_device_type;
1166 port->input = port_msg->input_port;
1167 port->mcs = port_msg->mcs;
1168 port->ddps = port_msg->ddps;
1169 port->ldps = port_msg->legacy_device_plug_status;
1170 port->dpcd_rev = port_msg->dpcd_revision;
1171 port->num_sdp_streams = port_msg->num_sdp_streams;
1172 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1173
1174 /* manage mstb port lists with mgr lock - take a reference
1175 for this list */
1176 if (created) {
1177 mutex_lock(&mstb->mgr->lock);
1178 kref_get(&port->kref);
1179 list_add(&port->next, &mstb->ports);
1180 mutex_unlock(&mstb->mgr->lock);
1181 }
1182
1183 if (old_ddps != port->ddps) {
1184 if (port->ddps) {
1185 if (!port->input)
1186 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1187 } else {
1188 port->available_pbn = 0;
1189 }
1190 }
1191
1192 if (old_pdt != port->pdt && !port->input) {
1193 drm_dp_port_teardown_pdt(port, old_pdt);
1194
1195 ret = drm_dp_port_setup_pdt(port);
1196 if (ret == true)
1197 drm_dp_send_link_address(mstb->mgr, port->mstb);
1198 }
1199
1200 if (created && !port->input) {
1201 char proppath[255];
1202
1203 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1204 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1205 if (!port->connector) {
1206 /* remove it from the port list */
1207 mutex_lock(&mstb->mgr->lock);
1208 list_del(&port->next);
1209 mutex_unlock(&mstb->mgr->lock);
1210 /* drop port list reference */
1211 drm_dp_put_port(port);
1212 goto out;
1213 }
1214 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1215 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1216 port->port_num >= DP_MST_LOGICAL_PORT_0) {
1217 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1218 drm_mode_connector_set_tile_property(port->connector);
1219 }
1220 (*mstb->mgr->cbs->register_connector)(port->connector);
1221 }
1222
1223 out:
1224 /* put reference to this port */
1225 drm_dp_put_port(port);
1226 }
1227
1228 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1229 struct drm_dp_connection_status_notify *conn_stat)
1230 {
1231 struct drm_dp_mst_port *port;
1232 int old_pdt;
1233 int old_ddps;
1234 bool dowork = false;
1235 port = drm_dp_get_port(mstb, conn_stat->port_number);
1236 if (!port)
1237 return;
1238
1239 old_ddps = port->ddps;
1240 old_pdt = port->pdt;
1241 port->pdt = conn_stat->peer_device_type;
1242 port->mcs = conn_stat->message_capability_status;
1243 port->ldps = conn_stat->legacy_device_plug_status;
1244 port->ddps = conn_stat->displayport_device_plug_status;
1245
1246 if (old_ddps != port->ddps) {
1247 if (port->ddps) {
1248 dowork = true;
1249 } else {
1250 port->available_pbn = 0;
1251 }
1252 }
1253 if (old_pdt != port->pdt && !port->input) {
1254 drm_dp_port_teardown_pdt(port, old_pdt);
1255
1256 if (drm_dp_port_setup_pdt(port))
1257 dowork = true;
1258 }
1259
1260 drm_dp_put_port(port);
1261 if (dowork)
1262 queue_work(system_long_wq, &mstb->mgr->work);
1263
1264 }
1265
1266 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1267 u8 lct, u8 *rad)
1268 {
1269 struct drm_dp_mst_branch *mstb;
1270 struct drm_dp_mst_port *port;
1271 int i;
1272 /* find the port by iterating down */
1273
1274 mutex_lock(&mgr->lock);
1275 mstb = mgr->mst_primary;
1276
1277 for (i = 0; i < lct - 1; i++) {
1278 int shift = (i % 2) ? 0 : 4;
1279 int port_num = (rad[i / 2] >> shift) & 0xf;
1280
1281 list_for_each_entry(port, &mstb->ports, next) {
1282 if (port->port_num == port_num) {
1283 mstb = port->mstb;
1284 if (!mstb) {
1285 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1286 goto out;
1287 }
1288
1289 break;
1290 }
1291 }
1292 }
1293 kref_get(&mstb->kref);
1294 out:
1295 mutex_unlock(&mgr->lock);
1296 return mstb;
1297 }
1298
1299 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1300 struct drm_dp_mst_branch *mstb,
1301 uint8_t *guid)
1302 {
1303 struct drm_dp_mst_branch *found_mstb;
1304 struct drm_dp_mst_port *port;
1305
1306 if (memcmp(mstb->guid, guid, 16) == 0)
1307 return mstb;
1308
1309
1310 list_for_each_entry(port, &mstb->ports, next) {
1311 if (!port->mstb)
1312 continue;
1313
1314 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1315
1316 if (found_mstb)
1317 return found_mstb;
1318 }
1319
1320 return NULL;
1321 }
1322
1323 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1324 struct drm_dp_mst_topology_mgr *mgr,
1325 uint8_t *guid)
1326 {
1327 struct drm_dp_mst_branch *mstb;
1328
1329 /* find the port by iterating down */
1330 mutex_lock(&mgr->lock);
1331
1332 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1333
1334 if (mstb)
1335 kref_get(&mstb->kref);
1336
1337 mutex_unlock(&mgr->lock);
1338 return mstb;
1339 }
1340
1341 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1342 struct drm_dp_mst_branch *mstb)
1343 {
1344 struct drm_dp_mst_port *port;
1345 struct drm_dp_mst_branch *mstb_child;
1346 if (!mstb->link_address_sent)
1347 drm_dp_send_link_address(mgr, mstb);
1348
1349 list_for_each_entry(port, &mstb->ports, next) {
1350 if (port->input)
1351 continue;
1352
1353 if (!port->ddps)
1354 continue;
1355
1356 if (!port->available_pbn)
1357 drm_dp_send_enum_path_resources(mgr, mstb, port);
1358
1359 if (port->mstb) {
1360 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1361 if (mstb_child) {
1362 drm_dp_check_and_send_link_address(mgr, mstb_child);
1363 drm_dp_put_mst_branch_device(mstb_child);
1364 }
1365 }
1366 }
1367 }
1368
1369 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1370 {
1371 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1372 struct drm_dp_mst_branch *mstb;
1373
1374 mutex_lock(&mgr->lock);
1375 mstb = mgr->mst_primary;
1376 if (mstb) {
1377 kref_get(&mstb->kref);
1378 }
1379 mutex_unlock(&mgr->lock);
1380 if (mstb) {
1381 drm_dp_check_and_send_link_address(mgr, mstb);
1382 drm_dp_put_mst_branch_device(mstb);
1383 }
1384 }
1385
1386 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1387 u8 *guid)
1388 {
1389 u64 salt;
1390
1391 if (memchr_inv(guid, 0, 16))
1392 return true;
1393
1394 salt = get_jiffies_64();
1395
1396 memcpy(&guid[0], &salt, sizeof(u64));
1397 memcpy(&guid[8], &salt, sizeof(u64));
1398
1399 return false;
1400 }
1401
1402 #if 0
1403 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1404 {
1405 struct drm_dp_sideband_msg_req_body req;
1406
1407 req.req_type = DP_REMOTE_DPCD_READ;
1408 req.u.dpcd_read.port_number = port_num;
1409 req.u.dpcd_read.dpcd_address = offset;
1410 req.u.dpcd_read.num_bytes = num_bytes;
1411 drm_dp_encode_sideband_req(&req, msg);
1412
1413 return 0;
1414 }
1415 #endif
1416
1417 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1418 bool up, u8 *msg, int len)
1419 {
1420 int ret;
1421 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1422 int tosend, total, offset;
1423 int retries = 0;
1424
1425 retry:
1426 total = len;
1427 offset = 0;
1428 do {
1429 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1430
1431 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1432 &msg[offset],
1433 tosend);
1434 if (ret != tosend) {
1435 if (ret == -EIO && retries < 5) {
1436 retries++;
1437 goto retry;
1438 }
1439 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1440
1441 return -EIO;
1442 }
1443 offset += tosend;
1444 total -= tosend;
1445 } while (total > 0);
1446 return 0;
1447 }
1448
1449 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1450 struct drm_dp_sideband_msg_tx *txmsg)
1451 {
1452 struct drm_dp_mst_branch *mstb = txmsg->dst;
1453 u8 req_type;
1454
1455 /* both msg slots are full */
1456 if (txmsg->seqno == -1) {
1457 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1458 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1459 return -EAGAIN;
1460 }
1461 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1462 txmsg->seqno = mstb->last_seqno;
1463 mstb->last_seqno ^= 1;
1464 } else if (mstb->tx_slots[0] == NULL)
1465 txmsg->seqno = 0;
1466 else
1467 txmsg->seqno = 1;
1468 mstb->tx_slots[txmsg->seqno] = txmsg;
1469 }
1470
1471 req_type = txmsg->msg[0] & 0x7f;
1472 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1473 req_type == DP_RESOURCE_STATUS_NOTIFY)
1474 hdr->broadcast = 1;
1475 else
1476 hdr->broadcast = 0;
1477 hdr->path_msg = txmsg->path_msg;
1478 hdr->lct = mstb->lct;
1479 hdr->lcr = mstb->lct - 1;
1480 if (mstb->lct > 1)
1481 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1482 hdr->seqno = txmsg->seqno;
1483 return 0;
1484 }
1485 /*
1486 * process a single block of the next message in the sideband queue
1487 */
1488 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1489 struct drm_dp_sideband_msg_tx *txmsg,
1490 bool up)
1491 {
1492 u8 chunk[48];
1493 struct drm_dp_sideband_msg_hdr hdr;
1494 int len, space, idx, tosend;
1495 int ret;
1496
1497 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1498
1499 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1500 txmsg->seqno = -1;
1501 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1502 }
1503
1504 /* make hdr from dst mst - for replies use seqno
1505 otherwise assign one */
1506 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1507 if (ret < 0)
1508 return ret;
1509
1510 /* amount left to send in this message */
1511 len = txmsg->cur_len - txmsg->cur_offset;
1512
1513 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1514 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1515
1516 tosend = min(len, space);
1517 if (len == txmsg->cur_len)
1518 hdr.somt = 1;
1519 if (space >= len)
1520 hdr.eomt = 1;
1521
1522
1523 hdr.msg_len = tosend + 1;
1524 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1525 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1526 /* add crc at end */
1527 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1528 idx += tosend + 1;
1529
1530 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1531 if (ret) {
1532 DRM_DEBUG_KMS("sideband msg failed to send\n");
1533 return ret;
1534 }
1535
1536 txmsg->cur_offset += tosend;
1537 if (txmsg->cur_offset == txmsg->cur_len) {
1538 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1539 return 1;
1540 }
1541 return 0;
1542 }
1543
1544 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1545 {
1546 struct drm_dp_sideband_msg_tx *txmsg;
1547 int ret;
1548
1549 WARN_ON(!mutex_is_locked(&mgr->qlock));
1550
1551 /* construct a chunk from the first msg in the tx_msg queue */
1552 if (list_empty(&mgr->tx_msg_downq))
1553 return;
1554
1555 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1556 ret = process_single_tx_qlock(mgr, txmsg, false);
1557 if (ret == 1) {
1558 /* txmsg is sent it should be in the slots now */
1559 list_del(&txmsg->next);
1560 } else if (ret) {
1561 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1562 list_del(&txmsg->next);
1563 if (txmsg->seqno != -1)
1564 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1565 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1566 wake_up_all(&mgr->tx_waitq);
1567 }
1568 }
1569
1570 /* called holding qlock */
1571 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1572 struct drm_dp_sideband_msg_tx *txmsg)
1573 {
1574 int ret;
1575
1576 /* construct a chunk from the first msg in the tx_msg queue */
1577 ret = process_single_tx_qlock(mgr, txmsg, true);
1578
1579 if (ret != 1)
1580 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1581
1582 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1583 }
1584
1585 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1586 struct drm_dp_sideband_msg_tx *txmsg)
1587 {
1588 mutex_lock(&mgr->qlock);
1589 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1590 if (list_is_singular(&mgr->tx_msg_downq))
1591 process_single_down_tx_qlock(mgr);
1592 mutex_unlock(&mgr->qlock);
1593 }
1594
1595 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1596 struct drm_dp_mst_branch *mstb)
1597 {
1598 int len;
1599 struct drm_dp_sideband_msg_tx *txmsg;
1600 int ret;
1601
1602 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1603 if (!txmsg)
1604 return;
1605
1606 txmsg->dst = mstb;
1607 len = build_link_address(txmsg);
1608
1609 mstb->link_address_sent = true;
1610 drm_dp_queue_down_tx(mgr, txmsg);
1611
1612 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1613 if (ret > 0) {
1614 int i;
1615
1616 if (txmsg->reply.reply_type == 1)
1617 DRM_DEBUG_KMS("link address nak received\n");
1618 else {
1619 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1620 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1621 DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i,
1622 txmsg->reply.u.link_addr.ports[i].input_port,
1623 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1624 txmsg->reply.u.link_addr.ports[i].port_number,
1625 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1626 txmsg->reply.u.link_addr.ports[i].mcs,
1627 txmsg->reply.u.link_addr.ports[i].ddps,
1628 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1629 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1630 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1631 }
1632
1633 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1634
1635 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1636 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1637 }
1638 (*mgr->cbs->hotplug)(mgr);
1639 }
1640 } else {
1641 mstb->link_address_sent = false;
1642 DRM_DEBUG_KMS("link address failed %d\n", ret);
1643 }
1644
1645 kfree(txmsg);
1646 }
1647
1648 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1649 struct drm_dp_mst_branch *mstb,
1650 struct drm_dp_mst_port *port)
1651 {
1652 int len;
1653 struct drm_dp_sideband_msg_tx *txmsg;
1654 int ret;
1655
1656 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1657 if (!txmsg)
1658 return -ENOMEM;
1659
1660 txmsg->dst = mstb;
1661 len = build_enum_path_resources(txmsg, port->port_num);
1662
1663 drm_dp_queue_down_tx(mgr, txmsg);
1664
1665 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1666 if (ret > 0) {
1667 if (txmsg->reply.reply_type == 1)
1668 DRM_DEBUG_KMS("enum path resources nak received\n");
1669 else {
1670 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1671 DRM_ERROR("got incorrect port in response\n");
1672 DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number,
1673 txmsg->reply.u.path_resources.avail_payload_bw_number);
1674 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1675 }
1676 }
1677
1678 kfree(txmsg);
1679 return 0;
1680 }
1681
1682 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1683 {
1684 if (!mstb->port_parent)
1685 return NULL;
1686
1687 if (mstb->port_parent->mstb != mstb)
1688 return mstb->port_parent;
1689
1690 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1691 }
1692
1693 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1694 struct drm_dp_mst_branch *mstb,
1695 int *port_num)
1696 {
1697 struct drm_dp_mst_branch *rmstb = NULL;
1698 struct drm_dp_mst_port *found_port;
1699 mutex_lock(&mgr->lock);
1700 if (mgr->mst_primary) {
1701 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1702
1703 if (found_port) {
1704 rmstb = found_port->parent;
1705 kref_get(&rmstb->kref);
1706 *port_num = found_port->port_num;
1707 }
1708 }
1709 mutex_unlock(&mgr->lock);
1710 return rmstb;
1711 }
1712
1713 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1714 struct drm_dp_mst_port *port,
1715 int id,
1716 int pbn)
1717 {
1718 struct drm_dp_sideband_msg_tx *txmsg;
1719 struct drm_dp_mst_branch *mstb;
1720 int len, ret, port_num;
1721 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1722 int i;
1723
1724 port = drm_dp_get_validated_port_ref(mgr, port);
1725 if (!port)
1726 return -EINVAL;
1727
1728 port_num = port->port_num;
1729 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1730 if (!mstb) {
1731 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1732
1733 if (!mstb) {
1734 drm_dp_put_port(port);
1735 return -EINVAL;
1736 }
1737 }
1738
1739 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1740 if (!txmsg) {
1741 ret = -ENOMEM;
1742 goto fail_put;
1743 }
1744
1745 for (i = 0; i < port->num_sdp_streams; i++)
1746 sinks[i] = i;
1747
1748 txmsg->dst = mstb;
1749 len = build_allocate_payload(txmsg, port_num,
1750 id,
1751 pbn, port->num_sdp_streams, sinks);
1752
1753 drm_dp_queue_down_tx(mgr, txmsg);
1754
1755 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1756 if (ret > 0) {
1757 if (txmsg->reply.reply_type == 1) {
1758 ret = -EINVAL;
1759 } else
1760 ret = 0;
1761 }
1762 kfree(txmsg);
1763 fail_put:
1764 drm_dp_put_mst_branch_device(mstb);
1765 drm_dp_put_port(port);
1766 return ret;
1767 }
1768
1769 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
1770 struct drm_dp_mst_port *port, bool power_up)
1771 {
1772 struct drm_dp_sideband_msg_tx *txmsg;
1773 int len, ret;
1774
1775 port = drm_dp_get_validated_port_ref(mgr, port);
1776 if (!port)
1777 return -EINVAL;
1778
1779 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1780 if (!txmsg) {
1781 drm_dp_put_port(port);
1782 return -ENOMEM;
1783 }
1784
1785 txmsg->dst = port->parent;
1786 len = build_power_updown_phy(txmsg, port->port_num, power_up);
1787 drm_dp_queue_down_tx(mgr, txmsg);
1788
1789 ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);
1790 if (ret > 0) {
1791 if (txmsg->reply.reply_type == 1)
1792 ret = -EINVAL;
1793 else
1794 ret = 0;
1795 }
1796 kfree(txmsg);
1797 drm_dp_put_port(port);
1798
1799 return ret;
1800 }
1801 EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
1802
1803 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1804 int id,
1805 struct drm_dp_payload *payload)
1806 {
1807 int ret;
1808
1809 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1810 if (ret < 0) {
1811 payload->payload_state = 0;
1812 return ret;
1813 }
1814 payload->payload_state = DP_PAYLOAD_LOCAL;
1815 return 0;
1816 }
1817
1818 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1819 struct drm_dp_mst_port *port,
1820 int id,
1821 struct drm_dp_payload *payload)
1822 {
1823 int ret;
1824 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1825 if (ret < 0)
1826 return ret;
1827 payload->payload_state = DP_PAYLOAD_REMOTE;
1828 return ret;
1829 }
1830
1831 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1832 struct drm_dp_mst_port *port,
1833 int id,
1834 struct drm_dp_payload *payload)
1835 {
1836 DRM_DEBUG_KMS("\n");
1837 /* its okay for these to fail */
1838 if (port) {
1839 drm_dp_payload_send_msg(mgr, port, id, 0);
1840 }
1841
1842 drm_dp_dpcd_write_payload(mgr, id, payload);
1843 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1844 return 0;
1845 }
1846
1847 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1848 int id,
1849 struct drm_dp_payload *payload)
1850 {
1851 payload->payload_state = 0;
1852 return 0;
1853 }
1854
1855 /**
1856 * drm_dp_update_payload_part1() - Execute payload update part 1
1857 * @mgr: manager to use.
1858 *
1859 * This iterates over all proposed virtual channels, and tries to
1860 * allocate space in the link for them. For 0->slots transitions,
1861 * this step just writes the VCPI to the MST device. For slots->0
1862 * transitions, this writes the updated VCPIs and removes the
1863 * remote VC payloads.
1864 *
1865 * after calling this the driver should generate ACT and payload
1866 * packets.
1867 */
1868 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1869 {
1870 int i, j;
1871 int cur_slots = 1;
1872 struct drm_dp_payload req_payload;
1873 struct drm_dp_mst_port *port;
1874
1875 mutex_lock(&mgr->payload_lock);
1876 for (i = 0; i < mgr->max_payloads; i++) {
1877 /* solve the current payloads - compare to the hw ones
1878 - update the hw view */
1879 req_payload.start_slot = cur_slots;
1880 if (mgr->proposed_vcpis[i]) {
1881 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1882 port = drm_dp_get_validated_port_ref(mgr, port);
1883 if (!port) {
1884 mutex_unlock(&mgr->payload_lock);
1885 return -EINVAL;
1886 }
1887 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1888 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1889 } else {
1890 port = NULL;
1891 req_payload.num_slots = 0;
1892 }
1893
1894 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1895 mgr->payloads[i].start_slot = req_payload.start_slot;
1896 }
1897 /* work out what is required to happen with this payload */
1898 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1899
1900 /* need to push an update for this payload */
1901 if (req_payload.num_slots) {
1902 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1903 mgr->payloads[i].num_slots = req_payload.num_slots;
1904 mgr->payloads[i].vcpi = req_payload.vcpi;
1905 } else if (mgr->payloads[i].num_slots) {
1906 mgr->payloads[i].num_slots = 0;
1907 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1908 req_payload.payload_state = mgr->payloads[i].payload_state;
1909 mgr->payloads[i].start_slot = 0;
1910 }
1911 mgr->payloads[i].payload_state = req_payload.payload_state;
1912 }
1913 cur_slots += req_payload.num_slots;
1914
1915 if (port)
1916 drm_dp_put_port(port);
1917 }
1918
1919 for (i = 0; i < mgr->max_payloads; i++) {
1920 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1921 DRM_DEBUG_KMS("removing payload %d\n", i);
1922 for (j = i; j < mgr->max_payloads - 1; j++) {
1923 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1924 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1925 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1926 set_bit(j + 1, &mgr->payload_mask);
1927 } else {
1928 clear_bit(j + 1, &mgr->payload_mask);
1929 }
1930 }
1931 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1932 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1933 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1934
1935 }
1936 }
1937 mutex_unlock(&mgr->payload_lock);
1938
1939 return 0;
1940 }
1941 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1942
1943 /**
1944 * drm_dp_update_payload_part2() - Execute payload update part 2
1945 * @mgr: manager to use.
1946 *
1947 * This iterates over all proposed virtual channels, and tries to
1948 * allocate space in the link for them. For 0->slots transitions,
1949 * this step writes the remote VC payload commands. For slots->0
1950 * this just resets some internal state.
1951 */
1952 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1953 {
1954 struct drm_dp_mst_port *port;
1955 int i;
1956 int ret = 0;
1957 mutex_lock(&mgr->payload_lock);
1958 for (i = 0; i < mgr->max_payloads; i++) {
1959
1960 if (!mgr->proposed_vcpis[i])
1961 continue;
1962
1963 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1964
1965 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1966 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1967 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1968 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1969 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1970 }
1971 if (ret) {
1972 mutex_unlock(&mgr->payload_lock);
1973 return ret;
1974 }
1975 }
1976 mutex_unlock(&mgr->payload_lock);
1977 return 0;
1978 }
1979 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1980
1981 #if 0 /* unused as of yet */
1982 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1983 struct drm_dp_mst_port *port,
1984 int offset, int size)
1985 {
1986 int len;
1987 struct drm_dp_sideband_msg_tx *txmsg;
1988
1989 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1990 if (!txmsg)
1991 return -ENOMEM;
1992
1993 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1994 txmsg->dst = port->parent;
1995
1996 drm_dp_queue_down_tx(mgr, txmsg);
1997
1998 return 0;
1999 }
2000 #endif
2001
2002 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
2003 struct drm_dp_mst_port *port,
2004 int offset, int size, u8 *bytes)
2005 {
2006 int len;
2007 int ret;
2008 struct drm_dp_sideband_msg_tx *txmsg;
2009 struct drm_dp_mst_branch *mstb;
2010
2011 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
2012 if (!mstb)
2013 return -EINVAL;
2014
2015 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
2016 if (!txmsg) {
2017 ret = -ENOMEM;
2018 goto fail_put;
2019 }
2020
2021 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
2022 txmsg->dst = mstb;
2023
2024 drm_dp_queue_down_tx(mgr, txmsg);
2025
2026 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
2027 if (ret > 0) {
2028 if (txmsg->reply.reply_type == 1) {
2029 ret = -EINVAL;
2030 } else
2031 ret = 0;
2032 }
2033 kfree(txmsg);
2034 fail_put:
2035 drm_dp_put_mst_branch_device(mstb);
2036 return ret;
2037 }
2038
2039 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
2040 {
2041 struct drm_dp_sideband_msg_reply_body reply;
2042
2043 reply.reply_type = 0;
2044 reply.req_type = req_type;
2045 drm_dp_encode_sideband_reply(&reply, msg);
2046 return 0;
2047 }
2048
2049 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
2050 struct drm_dp_mst_branch *mstb,
2051 int req_type, int seqno, bool broadcast)
2052 {
2053 struct drm_dp_sideband_msg_tx *txmsg;
2054
2055 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
2056 if (!txmsg)
2057 return -ENOMEM;
2058
2059 txmsg->dst = mstb;
2060 txmsg->seqno = seqno;
2061 drm_dp_encode_up_ack_reply(txmsg, req_type);
2062
2063 mutex_lock(&mgr->qlock);
2064
2065 process_single_up_tx_qlock(mgr, txmsg);
2066
2067 mutex_unlock(&mgr->qlock);
2068
2069 kfree(txmsg);
2070 return 0;
2071 }
2072
2073 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
2074 int dp_link_count,
2075 int *out)
2076 {
2077 switch (dp_link_bw) {
2078 default:
2079 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
2080 dp_link_bw, dp_link_count);
2081 return false;
2082
2083 case DP_LINK_BW_1_62:
2084 *out = 3 * dp_link_count;
2085 break;
2086 case DP_LINK_BW_2_7:
2087 *out = 5 * dp_link_count;
2088 break;
2089 case DP_LINK_BW_5_4:
2090 *out = 10 * dp_link_count;
2091 break;
2092 case DP_LINK_BW_8_1:
2093 *out = 15 * dp_link_count;
2094 break;
2095 }
2096 return true;
2097 }
2098
2099 /**
2100 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2101 * @mgr: manager to set state for
2102 * @mst_state: true to enable MST on this connector - false to disable.
2103 *
2104 * This is called by the driver when it detects an MST capable device plugged
2105 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2106 */
2107 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2108 {
2109 int ret = 0;
2110 struct drm_dp_mst_branch *mstb = NULL;
2111
2112 mutex_lock(&mgr->lock);
2113 if (mst_state == mgr->mst_state)
2114 goto out_unlock;
2115
2116 mgr->mst_state = mst_state;
2117 /* set the device into MST mode */
2118 if (mst_state) {
2119 WARN_ON(mgr->mst_primary);
2120
2121 /* get dpcd info */
2122 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2123 if (ret != DP_RECEIVER_CAP_SIZE) {
2124 DRM_DEBUG_KMS("failed to read DPCD\n");
2125 goto out_unlock;
2126 }
2127
2128 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2129 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2130 &mgr->pbn_div)) {
2131 ret = -EINVAL;
2132 goto out_unlock;
2133 }
2134
2135 /* add initial branch device at LCT 1 */
2136 mstb = drm_dp_add_mst_branch_device(1, NULL);
2137 if (mstb == NULL) {
2138 ret = -ENOMEM;
2139 goto out_unlock;
2140 }
2141 mstb->mgr = mgr;
2142
2143 /* give this the main reference */
2144 mgr->mst_primary = mstb;
2145 kref_get(&mgr->mst_primary->kref);
2146
2147 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2148 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2149 if (ret < 0) {
2150 goto out_unlock;
2151 }
2152
2153 {
2154 struct drm_dp_payload reset_pay;
2155 reset_pay.start_slot = 0;
2156 reset_pay.num_slots = 0x3f;
2157 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2158 }
2159
2160 queue_work(system_long_wq, &mgr->work);
2161
2162 ret = 0;
2163 } else {
2164 /* disable MST on the device */
2165 mstb = mgr->mst_primary;
2166 mgr->mst_primary = NULL;
2167 /* this can fail if the device is gone */
2168 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2169 ret = 0;
2170 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2171 mgr->payload_mask = 0;
2172 set_bit(0, &mgr->payload_mask);
2173 mgr->vcpi_mask = 0;
2174 }
2175
2176 out_unlock:
2177 mutex_unlock(&mgr->lock);
2178 if (mstb)
2179 drm_dp_put_mst_branch_device(mstb);
2180 return ret;
2181
2182 }
2183 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2184
2185 /**
2186 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2187 * @mgr: manager to suspend
2188 *
2189 * This function tells the MST device that we can't handle UP messages
2190 * anymore. This should stop it from sending any since we are suspended.
2191 */
2192 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2193 {
2194 mutex_lock(&mgr->lock);
2195 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2196 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2197 mutex_unlock(&mgr->lock);
2198 flush_work(&mgr->work);
2199 flush_work(&mgr->destroy_connector_work);
2200 }
2201 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2202
2203 /**
2204 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2205 * @mgr: manager to resume
2206 *
2207 * This will fetch DPCD and see if the device is still there,
2208 * if it is, it will rewrite the MSTM control bits, and return.
2209 *
2210 * if the device fails this returns -1, and the driver should do
2211 * a full MST reprobe, in case we were undocked.
2212 */
2213 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2214 {
2215 int ret = 0;
2216
2217 mutex_lock(&mgr->lock);
2218
2219 if (mgr->mst_primary) {
2220 int sret;
2221 u8 guid[16];
2222
2223 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2224 if (sret != DP_RECEIVER_CAP_SIZE) {
2225 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2226 ret = -1;
2227 goto out_unlock;
2228 }
2229
2230 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2231 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2232 if (ret < 0) {
2233 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2234 ret = -1;
2235 goto out_unlock;
2236 }
2237
2238 /* Some hubs forget their guids after they resume */
2239 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2240 if (sret != 16) {
2241 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2242 ret = -1;
2243 goto out_unlock;
2244 }
2245 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2246
2247 ret = 0;
2248 } else
2249 ret = -1;
2250
2251 out_unlock:
2252 mutex_unlock(&mgr->lock);
2253 return ret;
2254 }
2255 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2256
2257 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2258 {
2259 int len;
2260 u8 replyblock[32];
2261 int replylen, origlen, curreply;
2262 int ret;
2263 struct drm_dp_sideband_msg_rx *msg;
2264 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2265 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2266
2267 len = min(mgr->max_dpcd_transaction_bytes, 16);
2268 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2269 replyblock, len);
2270 if (ret != len) {
2271 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2272 return false;
2273 }
2274 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2275 if (!ret) {
2276 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2277 return false;
2278 }
2279 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2280
2281 origlen = replylen;
2282 replylen -= len;
2283 curreply = len;
2284 while (replylen > 0) {
2285 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2286 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2287 replyblock, len);
2288 if (ret != len) {
2289 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
2290 len, ret);
2291 return false;
2292 }
2293
2294 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2295 if (!ret) {
2296 DRM_DEBUG_KMS("failed to build sideband msg\n");
2297 return false;
2298 }
2299
2300 curreply += len;
2301 replylen -= len;
2302 }
2303 return true;
2304 }
2305
2306 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2307 {
2308 int ret = 0;
2309
2310 if (!drm_dp_get_one_sb_msg(mgr, false)) {
2311 memset(&mgr->down_rep_recv, 0,
2312 sizeof(struct drm_dp_sideband_msg_rx));
2313 return 0;
2314 }
2315
2316 if (mgr->down_rep_recv.have_eomt) {
2317 struct drm_dp_sideband_msg_tx *txmsg;
2318 struct drm_dp_mst_branch *mstb;
2319 int slot = -1;
2320 mstb = drm_dp_get_mst_branch_device(mgr,
2321 mgr->down_rep_recv.initial_hdr.lct,
2322 mgr->down_rep_recv.initial_hdr.rad);
2323
2324 if (!mstb) {
2325 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2326 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2327 return 0;
2328 }
2329
2330 /* find the message */
2331 slot = mgr->down_rep_recv.initial_hdr.seqno;
2332 mutex_lock(&mgr->qlock);
2333 txmsg = mstb->tx_slots[slot];
2334 /* remove from slots */
2335 mutex_unlock(&mgr->qlock);
2336
2337 if (!txmsg) {
2338 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2339 mstb,
2340 mgr->down_rep_recv.initial_hdr.seqno,
2341 mgr->down_rep_recv.initial_hdr.lct,
2342 mgr->down_rep_recv.initial_hdr.rad[0],
2343 mgr->down_rep_recv.msg[0]);
2344 drm_dp_put_mst_branch_device(mstb);
2345 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2346 return 0;
2347 }
2348
2349 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2350 if (txmsg->reply.reply_type == 1) {
2351 DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data);
2352 }
2353
2354 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2355 drm_dp_put_mst_branch_device(mstb);
2356
2357 mutex_lock(&mgr->qlock);
2358 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2359 mstb->tx_slots[slot] = NULL;
2360 mutex_unlock(&mgr->qlock);
2361
2362 wake_up_all(&mgr->tx_waitq);
2363 }
2364 return ret;
2365 }
2366
2367 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2368 {
2369 int ret = 0;
2370
2371 if (!drm_dp_get_one_sb_msg(mgr, true)) {
2372 memset(&mgr->up_req_recv, 0,
2373 sizeof(struct drm_dp_sideband_msg_rx));
2374 return 0;
2375 }
2376
2377 if (mgr->up_req_recv.have_eomt) {
2378 struct drm_dp_sideband_msg_req_body msg;
2379 struct drm_dp_mst_branch *mstb = NULL;
2380 bool seqno;
2381
2382 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2383 mstb = drm_dp_get_mst_branch_device(mgr,
2384 mgr->up_req_recv.initial_hdr.lct,
2385 mgr->up_req_recv.initial_hdr.rad);
2386 if (!mstb) {
2387 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2388 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2389 return 0;
2390 }
2391 }
2392
2393 seqno = mgr->up_req_recv.initial_hdr.seqno;
2394 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2395
2396 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2397 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2398
2399 if (!mstb)
2400 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2401
2402 if (!mstb) {
2403 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2404 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2405 return 0;
2406 }
2407
2408 drm_dp_update_port(mstb, &msg.u.conn_stat);
2409
2410 DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type);
2411 (*mgr->cbs->hotplug)(mgr);
2412
2413 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2414 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2415 if (!mstb)
2416 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2417
2418 if (!mstb) {
2419 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2420 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2421 return 0;
2422 }
2423
2424 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2425 }
2426
2427 if (mstb)
2428 drm_dp_put_mst_branch_device(mstb);
2429
2430 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2431 }
2432 return ret;
2433 }
2434
2435 /**
2436 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2437 * @mgr: manager to notify irq for.
2438 * @esi: 4 bytes from SINK_COUNT_ESI
2439 * @handled: whether the hpd interrupt was consumed or not
2440 *
2441 * This should be called from the driver when it detects a short IRQ,
2442 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2443 * topology manager will process the sideband messages received as a result
2444 * of this.
2445 */
2446 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2447 {
2448 int ret = 0;
2449 int sc;
2450 *handled = false;
2451 sc = esi[0] & 0x3f;
2452
2453 if (sc != mgr->sink_count) {
2454 mgr->sink_count = sc;
2455 *handled = true;
2456 }
2457
2458 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2459 ret = drm_dp_mst_handle_down_rep(mgr);
2460 *handled = true;
2461 }
2462
2463 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2464 ret |= drm_dp_mst_handle_up_req(mgr);
2465 *handled = true;
2466 }
2467
2468 drm_dp_mst_kick_tx(mgr);
2469 return ret;
2470 }
2471 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2472
2473 /**
2474 * drm_dp_mst_detect_port() - get connection status for an MST port
2475 * @connector: DRM connector for this port
2476 * @mgr: manager for this port
2477 * @port: unverified pointer to a port
2478 *
2479 * This returns the current connection state for a port. It validates the
2480 * port pointer still exists so the caller doesn't require a reference
2481 */
2482 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2483 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2484 {
2485 enum drm_connector_status status = connector_status_disconnected;
2486
2487 /* we need to search for the port in the mgr in case its gone */
2488 port = drm_dp_get_validated_port_ref(mgr, port);
2489 if (!port)
2490 return connector_status_disconnected;
2491
2492 if (!port->ddps)
2493 goto out;
2494
2495 switch (port->pdt) {
2496 case DP_PEER_DEVICE_NONE:
2497 case DP_PEER_DEVICE_MST_BRANCHING:
2498 break;
2499
2500 case DP_PEER_DEVICE_SST_SINK:
2501 status = connector_status_connected;
2502 /* for logical ports - cache the EDID */
2503 if (port->port_num >= 8 && !port->cached_edid) {
2504 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2505 }
2506 break;
2507 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2508 if (port->ldps)
2509 status = connector_status_connected;
2510 break;
2511 }
2512 out:
2513 drm_dp_put_port(port);
2514 return status;
2515 }
2516 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2517
2518 /**
2519 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2520 * @mgr: manager for this port
2521 * @port: unverified pointer to a port.
2522 *
2523 * This returns whether the port supports audio or not.
2524 */
2525 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2526 struct drm_dp_mst_port *port)
2527 {
2528 bool ret = false;
2529
2530 port = drm_dp_get_validated_port_ref(mgr, port);
2531 if (!port)
2532 return ret;
2533 ret = port->has_audio;
2534 drm_dp_put_port(port);
2535 return ret;
2536 }
2537 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2538
2539 /**
2540 * drm_dp_mst_get_edid() - get EDID for an MST port
2541 * @connector: toplevel connector to get EDID for
2542 * @mgr: manager for this port
2543 * @port: unverified pointer to a port.
2544 *
2545 * This returns an EDID for the port connected to a connector,
2546 * It validates the pointer still exists so the caller doesn't require a
2547 * reference.
2548 */
2549 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2550 {
2551 struct edid *edid = NULL;
2552
2553 /* we need to search for the port in the mgr in case its gone */
2554 port = drm_dp_get_validated_port_ref(mgr, port);
2555 if (!port)
2556 return NULL;
2557
2558 if (port->cached_edid)
2559 edid = drm_edid_duplicate(port->cached_edid);
2560 else {
2561 edid = drm_get_edid(connector, &port->aux.ddc);
2562 drm_mode_connector_set_tile_property(connector);
2563 }
2564 port->has_audio = drm_detect_monitor_audio(edid);
2565 drm_dp_put_port(port);
2566 return edid;
2567 }
2568 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2569
2570 /**
2571 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2572 * @mgr: manager to use
2573 * @pbn: payload bandwidth to convert into slots.
2574 */
2575 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2576 int pbn)
2577 {
2578 int num_slots;
2579
2580 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2581
2582 /* max. time slots - one slot for MTP header */
2583 if (num_slots > 63)
2584 return -ENOSPC;
2585 return num_slots;
2586 }
2587 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2588
2589 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2590 struct drm_dp_vcpi *vcpi, int pbn, int slots)
2591 {
2592 int ret;
2593
2594 /* max. time slots - one slot for MTP header */
2595 if (slots > 63)
2596 return -ENOSPC;
2597
2598 vcpi->pbn = pbn;
2599 vcpi->aligned_pbn = slots * mgr->pbn_div;
2600 vcpi->num_slots = slots;
2601
2602 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2603 if (ret < 0)
2604 return ret;
2605 return 0;
2606 }
2607
2608 /**
2609 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2610 * @state: global atomic state
2611 * @mgr: MST topology manager for the port
2612 * @port: port to find vcpi slots for
2613 * @pbn: bandwidth required for the mode in PBN
2614 *
2615 * RETURNS:
2616 * Total slots in the atomic state assigned for this port or error
2617 */
2618 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2619 struct drm_dp_mst_topology_mgr *mgr,
2620 struct drm_dp_mst_port *port, int pbn)
2621 {
2622 struct drm_dp_mst_topology_state *topology_state;
2623 int req_slots;
2624
2625 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2626 if (IS_ERR(topology_state))
2627 return PTR_ERR(topology_state);
2628
2629 port = drm_dp_get_validated_port_ref(mgr, port);
2630 if (port == NULL)
2631 return -EINVAL;
2632 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2633 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2634 req_slots, topology_state->avail_slots);
2635
2636 if (req_slots > topology_state->avail_slots) {
2637 drm_dp_put_port(port);
2638 return -ENOSPC;
2639 }
2640
2641 topology_state->avail_slots -= req_slots;
2642 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2643
2644 drm_dp_put_port(port);
2645 return req_slots;
2646 }
2647 EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2648
2649 /**
2650 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2651 * @state: global atomic state
2652 * @mgr: MST topology manager for the port
2653 * @slots: number of vcpi slots to release
2654 *
2655 * RETURNS:
2656 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2657 * negative error code
2658 */
2659 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2660 struct drm_dp_mst_topology_mgr *mgr,
2661 int slots)
2662 {
2663 struct drm_dp_mst_topology_state *topology_state;
2664
2665 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2666 if (IS_ERR(topology_state))
2667 return PTR_ERR(topology_state);
2668
2669 /* We cannot rely on port->vcpi.num_slots to update
2670 * topology_state->avail_slots as the port may not exist if the parent
2671 * branch device was unplugged. This should be fixed by tracking
2672 * per-port slot allocation in drm_dp_mst_topology_state instead of
2673 * depending on the caller to tell us how many slots to release.
2674 */
2675 topology_state->avail_slots += slots;
2676 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2677 slots, topology_state->avail_slots);
2678
2679 return 0;
2680 }
2681 EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2682
2683 /**
2684 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2685 * @mgr: manager for this port
2686 * @port: port to allocate a virtual channel for.
2687 * @pbn: payload bandwidth number to request
2688 * @slots: returned number of slots for this PBN.
2689 */
2690 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2691 struct drm_dp_mst_port *port, int pbn, int slots)
2692 {
2693 int ret;
2694
2695 port = drm_dp_get_validated_port_ref(mgr, port);
2696 if (!port)
2697 return false;
2698
2699 if (slots < 0)
2700 return false;
2701
2702 if (port->vcpi.vcpi > 0) {
2703 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2704 if (pbn == port->vcpi.pbn) {
2705 drm_dp_put_port(port);
2706 return true;
2707 }
2708 }
2709
2710 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
2711 if (ret) {
2712 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2713 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
2714 goto out;
2715 }
2716 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2717 pbn, port->vcpi.num_slots);
2718
2719 drm_dp_put_port(port);
2720 return true;
2721 out:
2722 return false;
2723 }
2724 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2725
2726 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2727 {
2728 int slots = 0;
2729 port = drm_dp_get_validated_port_ref(mgr, port);
2730 if (!port)
2731 return slots;
2732
2733 slots = port->vcpi.num_slots;
2734 drm_dp_put_port(port);
2735 return slots;
2736 }
2737 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2738
2739 /**
2740 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2741 * @mgr: manager for this port
2742 * @port: unverified pointer to a port.
2743 *
2744 * This just resets the number of slots for the ports VCPI for later programming.
2745 */
2746 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2747 {
2748 port = drm_dp_get_validated_port_ref(mgr, port);
2749 if (!port)
2750 return;
2751 port->vcpi.num_slots = 0;
2752 drm_dp_put_port(port);
2753 }
2754 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2755
2756 /**
2757 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2758 * @mgr: manager for this port
2759 * @port: unverified port to deallocate vcpi for
2760 */
2761 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2762 {
2763 port = drm_dp_get_validated_port_ref(mgr, port);
2764 if (!port)
2765 return;
2766
2767 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2768 port->vcpi.num_slots = 0;
2769 port->vcpi.pbn = 0;
2770 port->vcpi.aligned_pbn = 0;
2771 port->vcpi.vcpi = 0;
2772 drm_dp_put_port(port);
2773 }
2774 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2775
2776 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2777 int id, struct drm_dp_payload *payload)
2778 {
2779 u8 payload_alloc[3], status;
2780 int ret;
2781 int retries = 0;
2782
2783 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2784 DP_PAYLOAD_TABLE_UPDATED);
2785
2786 payload_alloc[0] = id;
2787 payload_alloc[1] = payload->start_slot;
2788 payload_alloc[2] = payload->num_slots;
2789
2790 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2791 if (ret != 3) {
2792 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2793 goto fail;
2794 }
2795
2796 retry:
2797 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2798 if (ret < 0) {
2799 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2800 goto fail;
2801 }
2802
2803 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2804 retries++;
2805 if (retries < 20) {
2806 usleep_range(10000, 20000);
2807 goto retry;
2808 }
2809 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2810 ret = -EINVAL;
2811 goto fail;
2812 }
2813 ret = 0;
2814 fail:
2815 return ret;
2816 }
2817
2818
2819 /**
2820 * drm_dp_check_act_status() - Check ACT handled status.
2821 * @mgr: manager to use
2822 *
2823 * Check the payload status bits in the DPCD for ACT handled completion.
2824 */
2825 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2826 {
2827 u8 status;
2828 int ret;
2829 int count = 0;
2830
2831 do {
2832 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2833
2834 if (ret < 0) {
2835 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2836 goto fail;
2837 }
2838
2839 if (status & DP_PAYLOAD_ACT_HANDLED)
2840 break;
2841 count++;
2842 udelay(100);
2843
2844 } while (count < 30);
2845
2846 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2847 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2848 ret = -EINVAL;
2849 goto fail;
2850 }
2851 return 0;
2852 fail:
2853 return ret;
2854 }
2855 EXPORT_SYMBOL(drm_dp_check_act_status);
2856
2857 /**
2858 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2859 * @clock: dot clock for the mode
2860 * @bpp: bpp for the mode.
2861 *
2862 * This uses the formula in the spec to calculate the PBN value for a mode.
2863 */
2864 int drm_dp_calc_pbn_mode(int clock, int bpp)
2865 {
2866 u64 kbps;
2867 s64 peak_kbps;
2868 u32 numerator;
2869 u32 denominator;
2870
2871 kbps = clock * bpp;
2872
2873 /*
2874 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2875 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2876 * common multiplier to render an integer PBN for all link rate/lane
2877 * counts combinations
2878 * calculate
2879 * peak_kbps *= (1006/1000)
2880 * peak_kbps *= (64/54)
2881 * peak_kbps *= 8 convert to bytes
2882 */
2883
2884 numerator = 64 * 1006;
2885 denominator = 54 * 8 * 1000 * 1000;
2886
2887 kbps *= numerator;
2888 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2889
2890 return drm_fixp2int_ceil(peak_kbps);
2891 }
2892 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2893
2894 static int test_calc_pbn_mode(void)
2895 {
2896 int ret;
2897 ret = drm_dp_calc_pbn_mode(154000, 30);
2898 if (ret != 689) {
2899 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2900 154000, 30, 689, ret);
2901 return -EINVAL;
2902 }
2903 ret = drm_dp_calc_pbn_mode(234000, 30);
2904 if (ret != 1047) {
2905 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2906 234000, 30, 1047, ret);
2907 return -EINVAL;
2908 }
2909 ret = drm_dp_calc_pbn_mode(297000, 24);
2910 if (ret != 1063) {
2911 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2912 297000, 24, 1063, ret);
2913 return -EINVAL;
2914 }
2915 return 0;
2916 }
2917
2918 /* we want to kick the TX after we've ack the up/down IRQs. */
2919 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2920 {
2921 queue_work(system_long_wq, &mgr->tx_work);
2922 }
2923
2924 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2925 struct drm_dp_mst_branch *mstb)
2926 {
2927 struct drm_dp_mst_port *port;
2928 int tabs = mstb->lct;
2929 char prefix[10];
2930 int i;
2931
2932 for (i = 0; i < tabs; i++)
2933 prefix[i] = '\t';
2934 prefix[i] = '\0';
2935
2936 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2937 list_for_each_entry(port, &mstb->ports, next) {
2938 seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
2939 if (port->mstb)
2940 drm_dp_mst_dump_mstb(m, port->mstb);
2941 }
2942 }
2943
2944 #define DP_PAYLOAD_TABLE_SIZE 64
2945
2946 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2947 char *buf)
2948 {
2949 int i;
2950
2951 for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
2952 if (drm_dp_dpcd_read(mgr->aux,
2953 DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
2954 &buf[i], 16) != 16)
2955 return false;
2956 }
2957 return true;
2958 }
2959
2960 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2961 struct drm_dp_mst_port *port, char *name,
2962 int namelen)
2963 {
2964 struct edid *mst_edid;
2965
2966 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2967 drm_edid_get_monitor_name(mst_edid, name, namelen);
2968 }
2969
2970 /**
2971 * drm_dp_mst_dump_topology(): dump topology to seq file.
2972 * @m: seq_file to dump output to
2973 * @mgr: manager to dump current topology for.
2974 *
2975 * helper to dump MST topology to a seq file for debugfs.
2976 */
2977 void drm_dp_mst_dump_topology(struct seq_file *m,
2978 struct drm_dp_mst_topology_mgr *mgr)
2979 {
2980 int i;
2981 struct drm_dp_mst_port *port;
2982
2983 mutex_lock(&mgr->lock);
2984 if (mgr->mst_primary)
2985 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2986
2987 /* dump VCPIs */
2988 mutex_unlock(&mgr->lock);
2989
2990 mutex_lock(&mgr->payload_lock);
2991 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2992 mgr->max_payloads);
2993
2994 for (i = 0; i < mgr->max_payloads; i++) {
2995 if (mgr->proposed_vcpis[i]) {
2996 char name[14];
2997
2998 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2999 fetch_monitor_name(mgr, port, name, sizeof(name));
3000 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
3001 port->port_num, port->vcpi.vcpi,
3002 port->vcpi.num_slots,
3003 (*name != 0) ? name : "Unknown");
3004 } else
3005 seq_printf(m, "vcpi %d:unused\n", i);
3006 }
3007 for (i = 0; i < mgr->max_payloads; i++) {
3008 seq_printf(m, "payload %d: %d, %d, %d\n",
3009 i,
3010 mgr->payloads[i].payload_state,
3011 mgr->payloads[i].start_slot,
3012 mgr->payloads[i].num_slots);
3013
3014
3015 }
3016 mutex_unlock(&mgr->payload_lock);
3017
3018 mutex_lock(&mgr->lock);
3019 if (mgr->mst_primary) {
3020 u8 buf[DP_PAYLOAD_TABLE_SIZE];
3021 int ret;
3022
3023 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
3024 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
3025 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
3026 seq_printf(m, "faux/mst: %*ph\n", 2, buf);
3027 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
3028 seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
3029
3030 /* dump the standard OUI branch header */
3031 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
3032 seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
3033 for (i = 0x3; i < 0x8 && buf[i]; i++)
3034 seq_printf(m, "%c", buf[i]);
3035 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
3036 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
3037 if (dump_dp_payload_table(mgr, buf))
3038 seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
3039 }
3040
3041 mutex_unlock(&mgr->lock);
3042
3043 }
3044 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
3045
3046 static void drm_dp_tx_work(struct work_struct *work)
3047 {
3048 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
3049
3050 mutex_lock(&mgr->qlock);
3051 if (!list_empty(&mgr->tx_msg_downq))
3052 process_single_down_tx_qlock(mgr);
3053 mutex_unlock(&mgr->qlock);
3054 }
3055
3056 static void drm_dp_free_mst_port(struct kref *kref)
3057 {
3058 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
3059 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
3060 kfree(port);
3061 }
3062
3063 static void drm_dp_destroy_connector_work(struct work_struct *work)
3064 {
3065 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
3066 struct drm_dp_mst_port *port;
3067 bool send_hotplug = false;
3068 /*
3069 * Not a regular list traverse as we have to drop the destroy
3070 * connector lock before destroying the connector, to avoid AB->BA
3071 * ordering between this lock and the config mutex.
3072 */
3073 for (;;) {
3074 mutex_lock(&mgr->destroy_connector_lock);
3075 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
3076 if (!port) {
3077 mutex_unlock(&mgr->destroy_connector_lock);
3078 break;
3079 }
3080 list_del(&port->next);
3081 mutex_unlock(&mgr->destroy_connector_lock);
3082
3083 kref_init(&port->kref);
3084 INIT_LIST_HEAD(&port->next);
3085
3086 mgr->cbs->destroy_connector(mgr, port->connector);
3087
3088 drm_dp_port_teardown_pdt(port, port->pdt);
3089 port->pdt = DP_PEER_DEVICE_NONE;
3090
3091 if (!port->input && port->vcpi.vcpi > 0) {
3092 drm_dp_mst_reset_vcpi_slots(mgr, port);
3093 drm_dp_update_payload_part1(mgr);
3094 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
3095 }
3096
3097 kref_put(&port->kref, drm_dp_free_mst_port);
3098 send_hotplug = true;
3099 }
3100 if (send_hotplug)
3101 (*mgr->cbs->hotplug)(mgr);
3102 }
3103
3104 static struct drm_private_state *
3105 drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
3106 {
3107 struct drm_dp_mst_topology_state *state;
3108
3109 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
3110 if (!state)
3111 return NULL;
3112
3113 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
3114
3115 return &state->base;
3116 }
3117
3118 static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
3119 struct drm_private_state *state)
3120 {
3121 struct drm_dp_mst_topology_state *mst_state =
3122 to_dp_mst_topology_state(state);
3123
3124 kfree(mst_state);
3125 }
3126
3127 static const struct drm_private_state_funcs mst_state_funcs = {
3128 .atomic_duplicate_state = drm_dp_mst_duplicate_state,
3129 .atomic_destroy_state = drm_dp_mst_destroy_state,
3130 };
3131
3132 /**
3133 * drm_atomic_get_mst_topology_state: get MST topology state
3134 *
3135 * @state: global atomic state
3136 * @mgr: MST topology manager, also the private object in this case
3137 *
3138 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3139 * state vtable so that the private object state returned is that of a MST
3140 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3141 * to care of the locking, so warn if don't hold the connection_mutex.
3142 *
3143 * RETURNS:
3144 *
3145 * The MST topology state or error pointer.
3146 */
3147 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3148 struct drm_dp_mst_topology_mgr *mgr)
3149 {
3150 struct drm_device *dev = mgr->dev;
3151
3152 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
3153 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
3154 }
3155 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3156
3157 /**
3158 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3159 * @mgr: manager struct to initialise
3160 * @dev: device providing this structure - for i2c addition.
3161 * @aux: DP helper aux channel to talk to this device
3162 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3163 * @max_payloads: maximum number of payloads this GPU can source
3164 * @conn_base_id: the connector object ID the MST device is connected to.
3165 *
3166 * Return 0 for success, or negative error code on failure
3167 */
3168 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
3169 struct drm_device *dev, struct drm_dp_aux *aux,
3170 int max_dpcd_transaction_bytes,
3171 int max_payloads, int conn_base_id)
3172 {
3173 struct drm_dp_mst_topology_state *mst_state;
3174
3175 mutex_init(&mgr->lock);
3176 mutex_init(&mgr->qlock);
3177 mutex_init(&mgr->payload_lock);
3178 mutex_init(&mgr->destroy_connector_lock);
3179 INIT_LIST_HEAD(&mgr->tx_msg_downq);
3180 INIT_LIST_HEAD(&mgr->destroy_connector_list);
3181 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3182 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
3183 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
3184 init_waitqueue_head(&mgr->tx_waitq);
3185 mgr->dev = dev;
3186 mgr->aux = aux;
3187 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3188 mgr->max_payloads = max_payloads;
3189 mgr->conn_base_id = conn_base_id;
3190 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3191 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3192 return -EINVAL;
3193 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3194 if (!mgr->payloads)
3195 return -ENOMEM;
3196 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3197 if (!mgr->proposed_vcpis)
3198 return -ENOMEM;
3199 set_bit(0, &mgr->payload_mask);
3200 if (test_calc_pbn_mode() < 0)
3201 DRM_ERROR("MST PBN self-test failed\n");
3202
3203 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
3204 if (mst_state == NULL)
3205 return -ENOMEM;
3206
3207 mst_state->mgr = mgr;
3208
3209 /* max. time slots - one slot for MTP header */
3210 mst_state->avail_slots = 63;
3211
3212 drm_atomic_private_obj_init(&mgr->base,
3213 &mst_state->base,
3214 &mst_state_funcs);
3215
3216 return 0;
3217 }
3218 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3219
3220 /**
3221 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3222 * @mgr: manager to destroy
3223 */
3224 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3225 {
3226 flush_work(&mgr->work);
3227 flush_work(&mgr->destroy_connector_work);
3228 mutex_lock(&mgr->payload_lock);
3229 kfree(mgr->payloads);
3230 mgr->payloads = NULL;
3231 kfree(mgr->proposed_vcpis);
3232 mgr->proposed_vcpis = NULL;
3233 mutex_unlock(&mgr->payload_lock);
3234 mgr->dev = NULL;
3235 mgr->aux = NULL;
3236 drm_atomic_private_obj_fini(&mgr->base);
3237 mgr->funcs = NULL;
3238 }
3239 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3240
3241 /* I2C device */
3242 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3243 int num)
3244 {
3245 struct drm_dp_aux *aux = adapter->algo_data;
3246 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3247 struct drm_dp_mst_branch *mstb;
3248 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3249 unsigned int i;
3250 bool reading = false;
3251 struct drm_dp_sideband_msg_req_body msg;
3252 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3253 int ret;
3254
3255 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3256 if (!mstb)
3257 return -EREMOTEIO;
3258
3259 /* construct i2c msg */
3260 /* see if last msg is a read */
3261 if (msgs[num - 1].flags & I2C_M_RD)
3262 reading = true;
3263
3264 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3265 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3266 ret = -EIO;
3267 goto out;
3268 }
3269
3270 memset(&msg, 0, sizeof(msg));
3271 msg.req_type = DP_REMOTE_I2C_READ;
3272 msg.u.i2c_read.num_transactions = num - 1;
3273 msg.u.i2c_read.port_number = port->port_num;
3274 for (i = 0; i < num - 1; i++) {
3275 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3276 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3277 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3278 }
3279 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3280 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3281
3282 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3283 if (!txmsg) {
3284 ret = -ENOMEM;
3285 goto out;
3286 }
3287
3288 txmsg->dst = mstb;
3289 drm_dp_encode_sideband_req(&msg, txmsg);
3290
3291 drm_dp_queue_down_tx(mgr, txmsg);
3292
3293 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3294 if (ret > 0) {
3295
3296 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3297 ret = -EREMOTEIO;
3298 goto out;
3299 }
3300 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3301 ret = -EIO;
3302 goto out;
3303 }
3304 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3305 ret = num;
3306 }
3307 out:
3308 kfree(txmsg);
3309 drm_dp_put_mst_branch_device(mstb);
3310 return ret;
3311 }
3312
3313 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3314 {
3315 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3316 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3317 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3318 I2C_FUNC_10BIT_ADDR;
3319 }
3320
3321 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3322 .functionality = drm_dp_mst_i2c_functionality,
3323 .master_xfer = drm_dp_mst_i2c_xfer,
3324 };
3325
3326 /**
3327 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3328 * @aux: DisplayPort AUX channel
3329 *
3330 * Returns 0 on success or a negative error code on failure.
3331 */
3332 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3333 {
3334 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3335 aux->ddc.algo_data = aux;
3336 aux->ddc.retries = 3;
3337
3338 aux->ddc.class = I2C_CLASS_DDC;
3339 aux->ddc.owner = THIS_MODULE;
3340 aux->ddc.dev.parent = aux->dev;
3341 aux->ddc.dev.of_node = aux->dev->of_node;
3342
3343 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3344 sizeof(aux->ddc.name));
3345
3346 return i2c_add_adapter(&aux->ddc);
3347 }
3348
3349 /**
3350 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3351 * @aux: DisplayPort AUX channel
3352 */
3353 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3354 {
3355 i2c_del_adapter(&aux->ddc);
3356 }
Linux with added FPC-III support