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vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console
[linux/fpc-iii.git] / drivers / gpu / drm / drm_dp_mst_topology.c
blobfc978603fc94360ba89522b0ea16052f8ec5e915
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) << 4;
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_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 if (!mstb)
1278 goto out;
1279
1280 for (i = 0; i < lct - 1; i++) {
1281 int shift = (i % 2) ? 0 : 4;
1282 int port_num = (rad[i / 2] >> shift) & 0xf;
1283
1284 list_for_each_entry(port, &mstb->ports, next) {
1285 if (port->port_num == port_num) {
1286 mstb = port->mstb;
1287 if (!mstb) {
1288 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1289 goto out;
1290 }
1291
1292 break;
1293 }
1294 }
1295 }
1296 kref_get(&mstb->kref);
1297 out:
1298 mutex_unlock(&mgr->lock);
1299 return mstb;
1300 }
1301
1302 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1303 struct drm_dp_mst_branch *mstb,
1304 uint8_t *guid)
1305 {
1306 struct drm_dp_mst_branch *found_mstb;
1307 struct drm_dp_mst_port *port;
1308
1309 if (memcmp(mstb->guid, guid, 16) == 0)
1310 return mstb;
1311
1312
1313 list_for_each_entry(port, &mstb->ports, next) {
1314 if (!port->mstb)
1315 continue;
1316
1317 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1318
1319 if (found_mstb)
1320 return found_mstb;
1321 }
1322
1323 return NULL;
1324 }
1325
1326 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1327 struct drm_dp_mst_topology_mgr *mgr,
1328 uint8_t *guid)
1329 {
1330 struct drm_dp_mst_branch *mstb;
1331
1332 /* find the port by iterating down */
1333 mutex_lock(&mgr->lock);
1334
1335 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1336
1337 if (mstb)
1338 kref_get(&mstb->kref);
1339
1340 mutex_unlock(&mgr->lock);
1341 return mstb;
1342 }
1343
1344 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1345 struct drm_dp_mst_branch *mstb)
1346 {
1347 struct drm_dp_mst_port *port;
1348 struct drm_dp_mst_branch *mstb_child;
1349 if (!mstb->link_address_sent)
1350 drm_dp_send_link_address(mgr, mstb);
1351
1352 list_for_each_entry(port, &mstb->ports, next) {
1353 if (port->input)
1354 continue;
1355
1356 if (!port->ddps)
1357 continue;
1358
1359 if (!port->available_pbn)
1360 drm_dp_send_enum_path_resources(mgr, mstb, port);
1361
1362 if (port->mstb) {
1363 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1364 if (mstb_child) {
1365 drm_dp_check_and_send_link_address(mgr, mstb_child);
1366 drm_dp_put_mst_branch_device(mstb_child);
1367 }
1368 }
1369 }
1370 }
1371
1372 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1373 {
1374 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1375 struct drm_dp_mst_branch *mstb;
1376
1377 mutex_lock(&mgr->lock);
1378 mstb = mgr->mst_primary;
1379 if (mstb) {
1380 kref_get(&mstb->kref);
1381 }
1382 mutex_unlock(&mgr->lock);
1383 if (mstb) {
1384 drm_dp_check_and_send_link_address(mgr, mstb);
1385 drm_dp_put_mst_branch_device(mstb);
1386 }
1387 }
1388
1389 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1390 u8 *guid)
1391 {
1392 u64 salt;
1393
1394 if (memchr_inv(guid, 0, 16))
1395 return true;
1396
1397 salt = get_jiffies_64();
1398
1399 memcpy(&guid[0], &salt, sizeof(u64));
1400 memcpy(&guid[8], &salt, sizeof(u64));
1401
1402 return false;
1403 }
1404
1405 #if 0
1406 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1407 {
1408 struct drm_dp_sideband_msg_req_body req;
1409
1410 req.req_type = DP_REMOTE_DPCD_READ;
1411 req.u.dpcd_read.port_number = port_num;
1412 req.u.dpcd_read.dpcd_address = offset;
1413 req.u.dpcd_read.num_bytes = num_bytes;
1414 drm_dp_encode_sideband_req(&req, msg);
1415
1416 return 0;
1417 }
1418 #endif
1419
1420 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1421 bool up, u8 *msg, int len)
1422 {
1423 int ret;
1424 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1425 int tosend, total, offset;
1426 int retries = 0;
1427
1428 retry:
1429 total = len;
1430 offset = 0;
1431 do {
1432 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1433
1434 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1435 &msg[offset],
1436 tosend);
1437 if (ret != tosend) {
1438 if (ret == -EIO && retries < 5) {
1439 retries++;
1440 goto retry;
1441 }
1442 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1443
1444 return -EIO;
1445 }
1446 offset += tosend;
1447 total -= tosend;
1448 } while (total > 0);
1449 return 0;
1450 }
1451
1452 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1453 struct drm_dp_sideband_msg_tx *txmsg)
1454 {
1455 struct drm_dp_mst_branch *mstb = txmsg->dst;
1456 u8 req_type;
1457
1458 /* both msg slots are full */
1459 if (txmsg->seqno == -1) {
1460 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1461 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1462 return -EAGAIN;
1463 }
1464 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1465 txmsg->seqno = mstb->last_seqno;
1466 mstb->last_seqno ^= 1;
1467 } else if (mstb->tx_slots[0] == NULL)
1468 txmsg->seqno = 0;
1469 else
1470 txmsg->seqno = 1;
1471 mstb->tx_slots[txmsg->seqno] = txmsg;
1472 }
1473
1474 req_type = txmsg->msg[0] & 0x7f;
1475 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1476 req_type == DP_RESOURCE_STATUS_NOTIFY)
1477 hdr->broadcast = 1;
1478 else
1479 hdr->broadcast = 0;
1480 hdr->path_msg = txmsg->path_msg;
1481 hdr->lct = mstb->lct;
1482 hdr->lcr = mstb->lct - 1;
1483 if (mstb->lct > 1)
1484 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1485 hdr->seqno = txmsg->seqno;
1486 return 0;
1487 }
1488 /*
1489 * process a single block of the next message in the sideband queue
1490 */
1491 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1492 struct drm_dp_sideband_msg_tx *txmsg,
1493 bool up)
1494 {
1495 u8 chunk[48];
1496 struct drm_dp_sideband_msg_hdr hdr;
1497 int len, space, idx, tosend;
1498 int ret;
1499
1500 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1501
1502 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1503 txmsg->seqno = -1;
1504 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1505 }
1506
1507 /* make hdr from dst mst - for replies use seqno
1508 otherwise assign one */
1509 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1510 if (ret < 0)
1511 return ret;
1512
1513 /* amount left to send in this message */
1514 len = txmsg->cur_len - txmsg->cur_offset;
1515
1516 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1517 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1518
1519 tosend = min(len, space);
1520 if (len == txmsg->cur_len)
1521 hdr.somt = 1;
1522 if (space >= len)
1523 hdr.eomt = 1;
1524
1525
1526 hdr.msg_len = tosend + 1;
1527 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1528 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1529 /* add crc at end */
1530 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1531 idx += tosend + 1;
1532
1533 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1534 if (ret) {
1535 DRM_DEBUG_KMS("sideband msg failed to send\n");
1536 return ret;
1537 }
1538
1539 txmsg->cur_offset += tosend;
1540 if (txmsg->cur_offset == txmsg->cur_len) {
1541 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1542 return 1;
1543 }
1544 return 0;
1545 }
1546
1547 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1548 {
1549 struct drm_dp_sideband_msg_tx *txmsg;
1550 int ret;
1551
1552 WARN_ON(!mutex_is_locked(&mgr->qlock));
1553
1554 /* construct a chunk from the first msg in the tx_msg queue */
1555 if (list_empty(&mgr->tx_msg_downq))
1556 return;
1557
1558 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1559 ret = process_single_tx_qlock(mgr, txmsg, false);
1560 if (ret == 1) {
1561 /* txmsg is sent it should be in the slots now */
1562 list_del(&txmsg->next);
1563 } else if (ret) {
1564 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1565 list_del(&txmsg->next);
1566 if (txmsg->seqno != -1)
1567 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1568 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1569 wake_up_all(&mgr->tx_waitq);
1570 }
1571 }
1572
1573 /* called holding qlock */
1574 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1575 struct drm_dp_sideband_msg_tx *txmsg)
1576 {
1577 int ret;
1578
1579 /* construct a chunk from the first msg in the tx_msg queue */
1580 ret = process_single_tx_qlock(mgr, txmsg, true);
1581
1582 if (ret != 1)
1583 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1584
1585 if (txmsg->seqno != -1) {
1586 WARN_ON((unsigned int)txmsg->seqno >
1587 ARRAY_SIZE(txmsg->dst->tx_slots));
1588 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1589 }
1590 }
1591
1592 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1593 struct drm_dp_sideband_msg_tx *txmsg)
1594 {
1595 mutex_lock(&mgr->qlock);
1596 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1597 if (list_is_singular(&mgr->tx_msg_downq))
1598 process_single_down_tx_qlock(mgr);
1599 mutex_unlock(&mgr->qlock);
1600 }
1601
1602 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1603 struct drm_dp_mst_branch *mstb)
1604 {
1605 int len;
1606 struct drm_dp_sideband_msg_tx *txmsg;
1607 int ret;
1608
1609 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1610 if (!txmsg)
1611 return;
1612
1613 txmsg->dst = mstb;
1614 len = build_link_address(txmsg);
1615
1616 mstb->link_address_sent = true;
1617 drm_dp_queue_down_tx(mgr, txmsg);
1618
1619 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1620 if (ret > 0) {
1621 int i;
1622
1623 if (txmsg->reply.reply_type == 1)
1624 DRM_DEBUG_KMS("link address nak received\n");
1625 else {
1626 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1627 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1628 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,
1629 txmsg->reply.u.link_addr.ports[i].input_port,
1630 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1631 txmsg->reply.u.link_addr.ports[i].port_number,
1632 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1633 txmsg->reply.u.link_addr.ports[i].mcs,
1634 txmsg->reply.u.link_addr.ports[i].ddps,
1635 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1636 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1637 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1638 }
1639
1640 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1641
1642 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1643 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1644 }
1645 (*mgr->cbs->hotplug)(mgr);
1646 }
1647 } else {
1648 mstb->link_address_sent = false;
1649 DRM_DEBUG_KMS("link address failed %d\n", ret);
1650 }
1651
1652 kfree(txmsg);
1653 }
1654
1655 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1656 struct drm_dp_mst_branch *mstb,
1657 struct drm_dp_mst_port *port)
1658 {
1659 int len;
1660 struct drm_dp_sideband_msg_tx *txmsg;
1661 int ret;
1662
1663 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1664 if (!txmsg)
1665 return -ENOMEM;
1666
1667 txmsg->dst = mstb;
1668 len = build_enum_path_resources(txmsg, port->port_num);
1669
1670 drm_dp_queue_down_tx(mgr, txmsg);
1671
1672 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1673 if (ret > 0) {
1674 if (txmsg->reply.reply_type == 1)
1675 DRM_DEBUG_KMS("enum path resources nak received\n");
1676 else {
1677 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1678 DRM_ERROR("got incorrect port in response\n");
1679 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,
1680 txmsg->reply.u.path_resources.avail_payload_bw_number);
1681 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1682 }
1683 }
1684
1685 kfree(txmsg);
1686 return 0;
1687 }
1688
1689 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1690 {
1691 if (!mstb->port_parent)
1692 return NULL;
1693
1694 if (mstb->port_parent->mstb != mstb)
1695 return mstb->port_parent;
1696
1697 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1698 }
1699
1700 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1701 struct drm_dp_mst_branch *mstb,
1702 int *port_num)
1703 {
1704 struct drm_dp_mst_branch *rmstb = NULL;
1705 struct drm_dp_mst_port *found_port;
1706 mutex_lock(&mgr->lock);
1707 if (mgr->mst_primary) {
1708 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1709
1710 if (found_port) {
1711 rmstb = found_port->parent;
1712 kref_get(&rmstb->kref);
1713 *port_num = found_port->port_num;
1714 }
1715 }
1716 mutex_unlock(&mgr->lock);
1717 return rmstb;
1718 }
1719
1720 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1721 struct drm_dp_mst_port *port,
1722 int id,
1723 int pbn)
1724 {
1725 struct drm_dp_sideband_msg_tx *txmsg;
1726 struct drm_dp_mst_branch *mstb;
1727 int len, ret, port_num;
1728 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1729 int i;
1730
1731 port = drm_dp_get_validated_port_ref(mgr, port);
1732 if (!port)
1733 return -EINVAL;
1734
1735 port_num = port->port_num;
1736 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1737 if (!mstb) {
1738 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1739
1740 if (!mstb) {
1741 drm_dp_put_port(port);
1742 return -EINVAL;
1743 }
1744 }
1745
1746 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1747 if (!txmsg) {
1748 ret = -ENOMEM;
1749 goto fail_put;
1750 }
1751
1752 for (i = 0; i < port->num_sdp_streams; i++)
1753 sinks[i] = i;
1754
1755 txmsg->dst = mstb;
1756 len = build_allocate_payload(txmsg, port_num,
1757 id,
1758 pbn, port->num_sdp_streams, sinks);
1759
1760 drm_dp_queue_down_tx(mgr, txmsg);
1761
1762 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1763 if (ret > 0) {
1764 if (txmsg->reply.reply_type == 1) {
1765 ret = -EINVAL;
1766 } else
1767 ret = 0;
1768 }
1769 kfree(txmsg);
1770 fail_put:
1771 drm_dp_put_mst_branch_device(mstb);
1772 drm_dp_put_port(port);
1773 return ret;
1774 }
1775
1776 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
1777 struct drm_dp_mst_port *port, bool power_up)
1778 {
1779 struct drm_dp_sideband_msg_tx *txmsg;
1780 int len, ret;
1781
1782 port = drm_dp_get_validated_port_ref(mgr, port);
1783 if (!port)
1784 return -EINVAL;
1785
1786 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1787 if (!txmsg) {
1788 drm_dp_put_port(port);
1789 return -ENOMEM;
1790 }
1791
1792 txmsg->dst = port->parent;
1793 len = build_power_updown_phy(txmsg, port->port_num, power_up);
1794 drm_dp_queue_down_tx(mgr, txmsg);
1795
1796 ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);
1797 if (ret > 0) {
1798 if (txmsg->reply.reply_type == 1)
1799 ret = -EINVAL;
1800 else
1801 ret = 0;
1802 }
1803 kfree(txmsg);
1804 drm_dp_put_port(port);
1805
1806 return ret;
1807 }
1808 EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
1809
1810 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1811 int id,
1812 struct drm_dp_payload *payload)
1813 {
1814 int ret;
1815
1816 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1817 if (ret < 0) {
1818 payload->payload_state = 0;
1819 return ret;
1820 }
1821 payload->payload_state = DP_PAYLOAD_LOCAL;
1822 return 0;
1823 }
1824
1825 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1826 struct drm_dp_mst_port *port,
1827 int id,
1828 struct drm_dp_payload *payload)
1829 {
1830 int ret;
1831 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1832 if (ret < 0)
1833 return ret;
1834 payload->payload_state = DP_PAYLOAD_REMOTE;
1835 return ret;
1836 }
1837
1838 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1839 struct drm_dp_mst_port *port,
1840 int id,
1841 struct drm_dp_payload *payload)
1842 {
1843 DRM_DEBUG_KMS("\n");
1844 /* its okay for these to fail */
1845 if (port) {
1846 drm_dp_payload_send_msg(mgr, port, id, 0);
1847 }
1848
1849 drm_dp_dpcd_write_payload(mgr, id, payload);
1850 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1851 return 0;
1852 }
1853
1854 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1855 int id,
1856 struct drm_dp_payload *payload)
1857 {
1858 payload->payload_state = 0;
1859 return 0;
1860 }
1861
1862 /**
1863 * drm_dp_update_payload_part1() - Execute payload update part 1
1864 * @mgr: manager to use.
1865 *
1866 * This iterates over all proposed virtual channels, and tries to
1867 * allocate space in the link for them. For 0->slots transitions,
1868 * this step just writes the VCPI to the MST device. For slots->0
1869 * transitions, this writes the updated VCPIs and removes the
1870 * remote VC payloads.
1871 *
1872 * after calling this the driver should generate ACT and payload
1873 * packets.
1874 */
1875 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1876 {
1877 int i, j;
1878 int cur_slots = 1;
1879 struct drm_dp_payload req_payload;
1880 struct drm_dp_mst_port *port;
1881
1882 mutex_lock(&mgr->payload_lock);
1883 for (i = 0; i < mgr->max_payloads; i++) {
1884 /* solve the current payloads - compare to the hw ones
1885 - update the hw view */
1886 req_payload.start_slot = cur_slots;
1887 if (mgr->proposed_vcpis[i]) {
1888 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1889 port = drm_dp_get_validated_port_ref(mgr, port);
1890 if (!port) {
1891 mutex_unlock(&mgr->payload_lock);
1892 return -EINVAL;
1893 }
1894 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1895 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1896 } else {
1897 port = NULL;
1898 req_payload.num_slots = 0;
1899 }
1900
1901 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1902 mgr->payloads[i].start_slot = req_payload.start_slot;
1903 }
1904 /* work out what is required to happen with this payload */
1905 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1906
1907 /* need to push an update for this payload */
1908 if (req_payload.num_slots) {
1909 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1910 mgr->payloads[i].num_slots = req_payload.num_slots;
1911 mgr->payloads[i].vcpi = req_payload.vcpi;
1912 } else if (mgr->payloads[i].num_slots) {
1913 mgr->payloads[i].num_slots = 0;
1914 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1915 req_payload.payload_state = mgr->payloads[i].payload_state;
1916 mgr->payloads[i].start_slot = 0;
1917 }
1918 mgr->payloads[i].payload_state = req_payload.payload_state;
1919 }
1920 cur_slots += req_payload.num_slots;
1921
1922 if (port)
1923 drm_dp_put_port(port);
1924 }
1925
1926 for (i = 0; i < mgr->max_payloads; i++) {
1927 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1928 DRM_DEBUG_KMS("removing payload %d\n", i);
1929 for (j = i; j < mgr->max_payloads - 1; j++) {
1930 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1931 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1932 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1933 set_bit(j + 1, &mgr->payload_mask);
1934 } else {
1935 clear_bit(j + 1, &mgr->payload_mask);
1936 }
1937 }
1938 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1939 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1940 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1941
1942 }
1943 }
1944 mutex_unlock(&mgr->payload_lock);
1945
1946 return 0;
1947 }
1948 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1949
1950 /**
1951 * drm_dp_update_payload_part2() - Execute payload update part 2
1952 * @mgr: manager to use.
1953 *
1954 * This iterates over all proposed virtual channels, and tries to
1955 * allocate space in the link for them. For 0->slots transitions,
1956 * this step writes the remote VC payload commands. For slots->0
1957 * this just resets some internal state.
1958 */
1959 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1960 {
1961 struct drm_dp_mst_port *port;
1962 int i;
1963 int ret = 0;
1964 mutex_lock(&mgr->payload_lock);
1965 for (i = 0; i < mgr->max_payloads; i++) {
1966
1967 if (!mgr->proposed_vcpis[i])
1968 continue;
1969
1970 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1971
1972 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1973 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1974 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1975 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1976 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1977 }
1978 if (ret) {
1979 mutex_unlock(&mgr->payload_lock);
1980 return ret;
1981 }
1982 }
1983 mutex_unlock(&mgr->payload_lock);
1984 return 0;
1985 }
1986 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1987
1988 #if 0 /* unused as of yet */
1989 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1990 struct drm_dp_mst_port *port,
1991 int offset, int size)
1992 {
1993 int len;
1994 struct drm_dp_sideband_msg_tx *txmsg;
1995
1996 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1997 if (!txmsg)
1998 return -ENOMEM;
1999
2000 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
2001 txmsg->dst = port->parent;
2002
2003 drm_dp_queue_down_tx(mgr, txmsg);
2004
2005 return 0;
2006 }
2007 #endif
2008
2009 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
2010 struct drm_dp_mst_port *port,
2011 int offset, int size, u8 *bytes)
2012 {
2013 int len;
2014 int ret;
2015 struct drm_dp_sideband_msg_tx *txmsg;
2016 struct drm_dp_mst_branch *mstb;
2017
2018 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
2019 if (!mstb)
2020 return -EINVAL;
2021
2022 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
2023 if (!txmsg) {
2024 ret = -ENOMEM;
2025 goto fail_put;
2026 }
2027
2028 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
2029 txmsg->dst = mstb;
2030
2031 drm_dp_queue_down_tx(mgr, txmsg);
2032
2033 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
2034 if (ret > 0) {
2035 if (txmsg->reply.reply_type == 1) {
2036 ret = -EINVAL;
2037 } else
2038 ret = 0;
2039 }
2040 kfree(txmsg);
2041 fail_put:
2042 drm_dp_put_mst_branch_device(mstb);
2043 return ret;
2044 }
2045
2046 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
2047 {
2048 struct drm_dp_sideband_msg_reply_body reply;
2049
2050 reply.reply_type = 0;
2051 reply.req_type = req_type;
2052 drm_dp_encode_sideband_reply(&reply, msg);
2053 return 0;
2054 }
2055
2056 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
2057 struct drm_dp_mst_branch *mstb,
2058 int req_type, int seqno, bool broadcast)
2059 {
2060 struct drm_dp_sideband_msg_tx *txmsg;
2061
2062 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
2063 if (!txmsg)
2064 return -ENOMEM;
2065
2066 txmsg->dst = mstb;
2067 txmsg->seqno = seqno;
2068 drm_dp_encode_up_ack_reply(txmsg, req_type);
2069
2070 mutex_lock(&mgr->qlock);
2071
2072 process_single_up_tx_qlock(mgr, txmsg);
2073
2074 mutex_unlock(&mgr->qlock);
2075
2076 kfree(txmsg);
2077 return 0;
2078 }
2079
2080 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
2081 int dp_link_count,
2082 int *out)
2083 {
2084 switch (dp_link_bw) {
2085 default:
2086 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
2087 dp_link_bw, dp_link_count);
2088 return false;
2089
2090 case DP_LINK_BW_1_62:
2091 *out = 3 * dp_link_count;
2092 break;
2093 case DP_LINK_BW_2_7:
2094 *out = 5 * dp_link_count;
2095 break;
2096 case DP_LINK_BW_5_4:
2097 *out = 10 * dp_link_count;
2098 break;
2099 case DP_LINK_BW_8_1:
2100 *out = 15 * dp_link_count;
2101 break;
2102 }
2103 return true;
2104 }
2105
2106 /**
2107 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2108 * @mgr: manager to set state for
2109 * @mst_state: true to enable MST on this connector - false to disable.
2110 *
2111 * This is called by the driver when it detects an MST capable device plugged
2112 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2113 */
2114 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2115 {
2116 int ret = 0;
2117 int i = 0;
2118 struct drm_dp_mst_branch *mstb = NULL;
2119
2120 mutex_lock(&mgr->lock);
2121 if (mst_state == mgr->mst_state)
2122 goto out_unlock;
2123
2124 mgr->mst_state = mst_state;
2125 /* set the device into MST mode */
2126 if (mst_state) {
2127 WARN_ON(mgr->mst_primary);
2128
2129 /* get dpcd info */
2130 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2131 if (ret != DP_RECEIVER_CAP_SIZE) {
2132 DRM_DEBUG_KMS("failed to read DPCD\n");
2133 goto out_unlock;
2134 }
2135
2136 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2137 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2138 &mgr->pbn_div)) {
2139 ret = -EINVAL;
2140 goto out_unlock;
2141 }
2142
2143 /* add initial branch device at LCT 1 */
2144 mstb = drm_dp_add_mst_branch_device(1, NULL);
2145 if (mstb == NULL) {
2146 ret = -ENOMEM;
2147 goto out_unlock;
2148 }
2149 mstb->mgr = mgr;
2150
2151 /* give this the main reference */
2152 mgr->mst_primary = mstb;
2153 kref_get(&mgr->mst_primary->kref);
2154
2155 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2156 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2157 if (ret < 0) {
2158 goto out_unlock;
2159 }
2160
2161 {
2162 struct drm_dp_payload reset_pay;
2163 reset_pay.start_slot = 0;
2164 reset_pay.num_slots = 0x3f;
2165 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2166 }
2167
2168 queue_work(system_long_wq, &mgr->work);
2169
2170 ret = 0;
2171 } else {
2172 /* disable MST on the device */
2173 mstb = mgr->mst_primary;
2174 mgr->mst_primary = NULL;
2175 /* this can fail if the device is gone */
2176 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2177 ret = 0;
2178 mutex_lock(&mgr->payload_lock);
2179 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2180 mgr->payload_mask = 0;
2181 set_bit(0, &mgr->payload_mask);
2182 for (i = 0; i < mgr->max_payloads; i++) {
2183 struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i];
2184
2185 if (vcpi) {
2186 vcpi->vcpi = 0;
2187 vcpi->num_slots = 0;
2188 }
2189 mgr->proposed_vcpis[i] = NULL;
2190 }
2191 mgr->vcpi_mask = 0;
2192 mutex_unlock(&mgr->payload_lock);
2193 }
2194
2195 out_unlock:
2196 mutex_unlock(&mgr->lock);
2197 if (mstb)
2198 drm_dp_put_mst_branch_device(mstb);
2199 return ret;
2200
2201 }
2202 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2203
2204 /**
2205 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2206 * @mgr: manager to suspend
2207 *
2208 * This function tells the MST device that we can't handle UP messages
2209 * anymore. This should stop it from sending any since we are suspended.
2210 */
2211 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2212 {
2213 mutex_lock(&mgr->lock);
2214 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2215 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2216 mutex_unlock(&mgr->lock);
2217 flush_work(&mgr->work);
2218 flush_work(&mgr->destroy_connector_work);
2219 }
2220 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2221
2222 /**
2223 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2224 * @mgr: manager to resume
2225 *
2226 * This will fetch DPCD and see if the device is still there,
2227 * if it is, it will rewrite the MSTM control bits, and return.
2228 *
2229 * if the device fails this returns -1, and the driver should do
2230 * a full MST reprobe, in case we were undocked.
2231 */
2232 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2233 {
2234 int ret = 0;
2235
2236 mutex_lock(&mgr->lock);
2237
2238 if (mgr->mst_primary) {
2239 int sret;
2240 u8 guid[16];
2241
2242 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2243 if (sret != DP_RECEIVER_CAP_SIZE) {
2244 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2245 ret = -1;
2246 goto out_unlock;
2247 }
2248
2249 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2250 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2251 if (ret < 0) {
2252 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2253 ret = -1;
2254 goto out_unlock;
2255 }
2256
2257 /* Some hubs forget their guids after they resume */
2258 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2259 if (sret != 16) {
2260 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2261 ret = -1;
2262 goto out_unlock;
2263 }
2264 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2265
2266 ret = 0;
2267 } else
2268 ret = -1;
2269
2270 out_unlock:
2271 mutex_unlock(&mgr->lock);
2272 return ret;
2273 }
2274 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2275
2276 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2277 {
2278 int len;
2279 u8 replyblock[32];
2280 int replylen, origlen, curreply;
2281 int ret;
2282 struct drm_dp_sideband_msg_rx *msg;
2283 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2284 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2285
2286 len = min(mgr->max_dpcd_transaction_bytes, 16);
2287 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2288 replyblock, len);
2289 if (ret != len) {
2290 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2291 return false;
2292 }
2293 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2294 if (!ret) {
2295 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2296 return false;
2297 }
2298 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2299
2300 origlen = replylen;
2301 replylen -= len;
2302 curreply = len;
2303 while (replylen > 0) {
2304 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2305 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2306 replyblock, len);
2307 if (ret != len) {
2308 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
2309 len, ret);
2310 return false;
2311 }
2312
2313 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2314 if (!ret) {
2315 DRM_DEBUG_KMS("failed to build sideband msg\n");
2316 return false;
2317 }
2318
2319 curreply += len;
2320 replylen -= len;
2321 }
2322 return true;
2323 }
2324
2325 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2326 {
2327 int ret = 0;
2328
2329 if (!drm_dp_get_one_sb_msg(mgr, false)) {
2330 memset(&mgr->down_rep_recv, 0,
2331 sizeof(struct drm_dp_sideband_msg_rx));
2332 return 0;
2333 }
2334
2335 if (mgr->down_rep_recv.have_eomt) {
2336 struct drm_dp_sideband_msg_tx *txmsg;
2337 struct drm_dp_mst_branch *mstb;
2338 int slot = -1;
2339 mstb = drm_dp_get_mst_branch_device(mgr,
2340 mgr->down_rep_recv.initial_hdr.lct,
2341 mgr->down_rep_recv.initial_hdr.rad);
2342
2343 if (!mstb) {
2344 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2345 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2346 return 0;
2347 }
2348
2349 /* find the message */
2350 slot = mgr->down_rep_recv.initial_hdr.seqno;
2351 mutex_lock(&mgr->qlock);
2352 txmsg = mstb->tx_slots[slot];
2353 /* remove from slots */
2354 mutex_unlock(&mgr->qlock);
2355
2356 if (!txmsg) {
2357 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2358 mstb,
2359 mgr->down_rep_recv.initial_hdr.seqno,
2360 mgr->down_rep_recv.initial_hdr.lct,
2361 mgr->down_rep_recv.initial_hdr.rad[0],
2362 mgr->down_rep_recv.msg[0]);
2363 drm_dp_put_mst_branch_device(mstb);
2364 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2365 return 0;
2366 }
2367
2368 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2369 if (txmsg->reply.reply_type == 1) {
2370 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);
2371 }
2372
2373 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2374 drm_dp_put_mst_branch_device(mstb);
2375
2376 mutex_lock(&mgr->qlock);
2377 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2378 mstb->tx_slots[slot] = NULL;
2379 mutex_unlock(&mgr->qlock);
2380
2381 wake_up_all(&mgr->tx_waitq);
2382 }
2383 return ret;
2384 }
2385
2386 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2387 {
2388 int ret = 0;
2389
2390 if (!drm_dp_get_one_sb_msg(mgr, true)) {
2391 memset(&mgr->up_req_recv, 0,
2392 sizeof(struct drm_dp_sideband_msg_rx));
2393 return 0;
2394 }
2395
2396 if (mgr->up_req_recv.have_eomt) {
2397 struct drm_dp_sideband_msg_req_body msg;
2398 struct drm_dp_mst_branch *mstb = NULL;
2399 bool seqno;
2400
2401 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2402 mstb = drm_dp_get_mst_branch_device(mgr,
2403 mgr->up_req_recv.initial_hdr.lct,
2404 mgr->up_req_recv.initial_hdr.rad);
2405 if (!mstb) {
2406 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2407 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2408 return 0;
2409 }
2410 }
2411
2412 seqno = mgr->up_req_recv.initial_hdr.seqno;
2413 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2414
2415 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2416 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2417
2418 if (!mstb)
2419 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2420
2421 if (!mstb) {
2422 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2423 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2424 return 0;
2425 }
2426
2427 drm_dp_update_port(mstb, &msg.u.conn_stat);
2428
2429 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);
2430 (*mgr->cbs->hotplug)(mgr);
2431
2432 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2433 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2434 if (!mstb)
2435 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2436
2437 if (!mstb) {
2438 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2439 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2440 return 0;
2441 }
2442
2443 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2444 }
2445
2446 if (mstb)
2447 drm_dp_put_mst_branch_device(mstb);
2448
2449 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2450 }
2451 return ret;
2452 }
2453
2454 /**
2455 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2456 * @mgr: manager to notify irq for.
2457 * @esi: 4 bytes from SINK_COUNT_ESI
2458 * @handled: whether the hpd interrupt was consumed or not
2459 *
2460 * This should be called from the driver when it detects a short IRQ,
2461 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2462 * topology manager will process the sideband messages received as a result
2463 * of this.
2464 */
2465 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2466 {
2467 int ret = 0;
2468 int sc;
2469 *handled = false;
2470 sc = esi[0] & 0x3f;
2471
2472 if (sc != mgr->sink_count) {
2473 mgr->sink_count = sc;
2474 *handled = true;
2475 }
2476
2477 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2478 ret = drm_dp_mst_handle_down_rep(mgr);
2479 *handled = true;
2480 }
2481
2482 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2483 ret |= drm_dp_mst_handle_up_req(mgr);
2484 *handled = true;
2485 }
2486
2487 drm_dp_mst_kick_tx(mgr);
2488 return ret;
2489 }
2490 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2491
2492 /**
2493 * drm_dp_mst_detect_port() - get connection status for an MST port
2494 * @connector: DRM connector for this port
2495 * @mgr: manager for this port
2496 * @port: unverified pointer to a port
2497 *
2498 * This returns the current connection state for a port. It validates the
2499 * port pointer still exists so the caller doesn't require a reference
2500 */
2501 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2502 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2503 {
2504 enum drm_connector_status status = connector_status_disconnected;
2505
2506 /* we need to search for the port in the mgr in case its gone */
2507 port = drm_dp_get_validated_port_ref(mgr, port);
2508 if (!port)
2509 return connector_status_disconnected;
2510
2511 if (!port->ddps)
2512 goto out;
2513
2514 switch (port->pdt) {
2515 case DP_PEER_DEVICE_NONE:
2516 case DP_PEER_DEVICE_MST_BRANCHING:
2517 break;
2518
2519 case DP_PEER_DEVICE_SST_SINK:
2520 status = connector_status_connected;
2521 /* for logical ports - cache the EDID */
2522 if (port->port_num >= 8 && !port->cached_edid) {
2523 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2524 }
2525 break;
2526 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2527 if (port->ldps)
2528 status = connector_status_connected;
2529 break;
2530 }
2531 out:
2532 drm_dp_put_port(port);
2533 return status;
2534 }
2535 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2536
2537 /**
2538 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2539 * @mgr: manager for this port
2540 * @port: unverified pointer to a port.
2541 *
2542 * This returns whether the port supports audio or not.
2543 */
2544 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2545 struct drm_dp_mst_port *port)
2546 {
2547 bool ret = false;
2548
2549 port = drm_dp_get_validated_port_ref(mgr, port);
2550 if (!port)
2551 return ret;
2552 ret = port->has_audio;
2553 drm_dp_put_port(port);
2554 return ret;
2555 }
2556 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2557
2558 /**
2559 * drm_dp_mst_get_edid() - get EDID for an MST port
2560 * @connector: toplevel connector to get EDID for
2561 * @mgr: manager for this port
2562 * @port: unverified pointer to a port.
2563 *
2564 * This returns an EDID for the port connected to a connector,
2565 * It validates the pointer still exists so the caller doesn't require a
2566 * reference.
2567 */
2568 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2569 {
2570 struct edid *edid = NULL;
2571
2572 /* we need to search for the port in the mgr in case its gone */
2573 port = drm_dp_get_validated_port_ref(mgr, port);
2574 if (!port)
2575 return NULL;
2576
2577 if (port->cached_edid)
2578 edid = drm_edid_duplicate(port->cached_edid);
2579 else {
2580 edid = drm_get_edid(connector, &port->aux.ddc);
2581 drm_connector_set_tile_property(connector);
2582 }
2583 port->has_audio = drm_detect_monitor_audio(edid);
2584 drm_dp_put_port(port);
2585 return edid;
2586 }
2587 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2588
2589 /**
2590 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2591 * @mgr: manager to use
2592 * @pbn: payload bandwidth to convert into slots.
2593 */
2594 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2595 int pbn)
2596 {
2597 int num_slots;
2598
2599 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2600
2601 /* max. time slots - one slot for MTP header */
2602 if (num_slots > 63)
2603 return -ENOSPC;
2604 return num_slots;
2605 }
2606 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2607
2608 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2609 struct drm_dp_vcpi *vcpi, int pbn, int slots)
2610 {
2611 int ret;
2612
2613 /* max. time slots - one slot for MTP header */
2614 if (slots > 63)
2615 return -ENOSPC;
2616
2617 vcpi->pbn = pbn;
2618 vcpi->aligned_pbn = slots * mgr->pbn_div;
2619 vcpi->num_slots = slots;
2620
2621 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2622 if (ret < 0)
2623 return ret;
2624 return 0;
2625 }
2626
2627 /**
2628 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2629 * @state: global atomic state
2630 * @mgr: MST topology manager for the port
2631 * @port: port to find vcpi slots for
2632 * @pbn: bandwidth required for the mode in PBN
2633 *
2634 * RETURNS:
2635 * Total slots in the atomic state assigned for this port or error
2636 */
2637 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2638 struct drm_dp_mst_topology_mgr *mgr,
2639 struct drm_dp_mst_port *port, int pbn)
2640 {
2641 struct drm_dp_mst_topology_state *topology_state;
2642 int req_slots;
2643
2644 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2645 if (IS_ERR(topology_state))
2646 return PTR_ERR(topology_state);
2647
2648 port = drm_dp_get_validated_port_ref(mgr, port);
2649 if (port == NULL)
2650 return -EINVAL;
2651 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2652 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2653 req_slots, topology_state->avail_slots);
2654
2655 if (req_slots > topology_state->avail_slots) {
2656 drm_dp_put_port(port);
2657 return -ENOSPC;
2658 }
2659
2660 topology_state->avail_slots -= req_slots;
2661 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2662
2663 drm_dp_put_port(port);
2664 return req_slots;
2665 }
2666 EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2667
2668 /**
2669 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2670 * @state: global atomic state
2671 * @mgr: MST topology manager for the port
2672 * @slots: number of vcpi slots to release
2673 *
2674 * RETURNS:
2675 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2676 * negative error code
2677 */
2678 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2679 struct drm_dp_mst_topology_mgr *mgr,
2680 int slots)
2681 {
2682 struct drm_dp_mst_topology_state *topology_state;
2683
2684 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2685 if (IS_ERR(topology_state))
2686 return PTR_ERR(topology_state);
2687
2688 /* We cannot rely on port->vcpi.num_slots to update
2689 * topology_state->avail_slots as the port may not exist if the parent
2690 * branch device was unplugged. This should be fixed by tracking
2691 * per-port slot allocation in drm_dp_mst_topology_state instead of
2692 * depending on the caller to tell us how many slots to release.
2693 */
2694 topology_state->avail_slots += slots;
2695 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2696 slots, topology_state->avail_slots);
2697
2698 return 0;
2699 }
2700 EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2701
2702 /**
2703 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2704 * @mgr: manager for this port
2705 * @port: port to allocate a virtual channel for.
2706 * @pbn: payload bandwidth number to request
2707 * @slots: returned number of slots for this PBN.
2708 */
2709 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2710 struct drm_dp_mst_port *port, int pbn, int slots)
2711 {
2712 int ret;
2713
2714 port = drm_dp_get_validated_port_ref(mgr, port);
2715 if (!port)
2716 return false;
2717
2718 if (slots < 0)
2719 return false;
2720
2721 if (port->vcpi.vcpi > 0) {
2722 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2723 if (pbn == port->vcpi.pbn) {
2724 drm_dp_put_port(port);
2725 return true;
2726 }
2727 }
2728
2729 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
2730 if (ret) {
2731 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2732 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
2733 goto out;
2734 }
2735 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2736 pbn, port->vcpi.num_slots);
2737
2738 drm_dp_put_port(port);
2739 return true;
2740 out:
2741 return false;
2742 }
2743 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2744
2745 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2746 {
2747 int slots = 0;
2748 port = drm_dp_get_validated_port_ref(mgr, port);
2749 if (!port)
2750 return slots;
2751
2752 slots = port->vcpi.num_slots;
2753 drm_dp_put_port(port);
2754 return slots;
2755 }
2756 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2757
2758 /**
2759 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2760 * @mgr: manager for this port
2761 * @port: unverified pointer to a port.
2762 *
2763 * This just resets the number of slots for the ports VCPI for later programming.
2764 */
2765 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2766 {
2767 port = drm_dp_get_validated_port_ref(mgr, port);
2768 if (!port)
2769 return;
2770 port->vcpi.num_slots = 0;
2771 drm_dp_put_port(port);
2772 }
2773 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2774
2775 /**
2776 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2777 * @mgr: manager for this port
2778 * @port: unverified port to deallocate vcpi for
2779 */
2780 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2781 {
2782 port = drm_dp_get_validated_port_ref(mgr, port);
2783 if (!port)
2784 return;
2785
2786 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2787 port->vcpi.num_slots = 0;
2788 port->vcpi.pbn = 0;
2789 port->vcpi.aligned_pbn = 0;
2790 port->vcpi.vcpi = 0;
2791 drm_dp_put_port(port);
2792 }
2793 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2794
2795 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2796 int id, struct drm_dp_payload *payload)
2797 {
2798 u8 payload_alloc[3], status;
2799 int ret;
2800 int retries = 0;
2801
2802 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2803 DP_PAYLOAD_TABLE_UPDATED);
2804
2805 payload_alloc[0] = id;
2806 payload_alloc[1] = payload->start_slot;
2807 payload_alloc[2] = payload->num_slots;
2808
2809 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2810 if (ret != 3) {
2811 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2812 goto fail;
2813 }
2814
2815 retry:
2816 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2817 if (ret < 0) {
2818 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2819 goto fail;
2820 }
2821
2822 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2823 retries++;
2824 if (retries < 20) {
2825 usleep_range(10000, 20000);
2826 goto retry;
2827 }
2828 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2829 ret = -EINVAL;
2830 goto fail;
2831 }
2832 ret = 0;
2833 fail:
2834 return ret;
2835 }
2836
2837
2838 /**
2839 * drm_dp_check_act_status() - Check ACT handled status.
2840 * @mgr: manager to use
2841 *
2842 * Check the payload status bits in the DPCD for ACT handled completion.
2843 */
2844 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2845 {
2846 u8 status;
2847 int ret;
2848 int count = 0;
2849
2850 do {
2851 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2852
2853 if (ret < 0) {
2854 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2855 goto fail;
2856 }
2857
2858 if (status & DP_PAYLOAD_ACT_HANDLED)
2859 break;
2860 count++;
2861 udelay(100);
2862
2863 } while (count < 30);
2864
2865 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2866 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2867 ret = -EINVAL;
2868 goto fail;
2869 }
2870 return 0;
2871 fail:
2872 return ret;
2873 }
2874 EXPORT_SYMBOL(drm_dp_check_act_status);
2875
2876 /**
2877 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2878 * @clock: dot clock for the mode
2879 * @bpp: bpp for the mode.
2880 *
2881 * This uses the formula in the spec to calculate the PBN value for a mode.
2882 */
2883 int drm_dp_calc_pbn_mode(int clock, int bpp)
2884 {
2885 u64 kbps;
2886 s64 peak_kbps;
2887 u32 numerator;
2888 u32 denominator;
2889
2890 kbps = clock * bpp;
2891
2892 /*
2893 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2894 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2895 * common multiplier to render an integer PBN for all link rate/lane
2896 * counts combinations
2897 * calculate
2898 * peak_kbps *= (1006/1000)
2899 * peak_kbps *= (64/54)
2900 * peak_kbps *= 8 convert to bytes
2901 */
2902
2903 numerator = 64 * 1006;
2904 denominator = 54 * 8 * 1000 * 1000;
2905
2906 kbps *= numerator;
2907 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2908
2909 return drm_fixp2int_ceil(peak_kbps);
2910 }
2911 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2912
2913 static int test_calc_pbn_mode(void)
2914 {
2915 int ret;
2916 ret = drm_dp_calc_pbn_mode(154000, 30);
2917 if (ret != 689) {
2918 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2919 154000, 30, 689, ret);
2920 return -EINVAL;
2921 }
2922 ret = drm_dp_calc_pbn_mode(234000, 30);
2923 if (ret != 1047) {
2924 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2925 234000, 30, 1047, ret);
2926 return -EINVAL;
2927 }
2928 ret = drm_dp_calc_pbn_mode(297000, 24);
2929 if (ret != 1063) {
2930 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2931 297000, 24, 1063, ret);
2932 return -EINVAL;
2933 }
2934 return 0;
2935 }
2936
2937 /* we want to kick the TX after we've ack the up/down IRQs. */
2938 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2939 {
2940 queue_work(system_long_wq, &mgr->tx_work);
2941 }
2942
2943 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2944 struct drm_dp_mst_branch *mstb)
2945 {
2946 struct drm_dp_mst_port *port;
2947 int tabs = mstb->lct;
2948 char prefix[10];
2949 int i;
2950
2951 for (i = 0; i < tabs; i++)
2952 prefix[i] = '\t';
2953 prefix[i] = '\0';
2954
2955 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2956 list_for_each_entry(port, &mstb->ports, next) {
2957 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);
2958 if (port->mstb)
2959 drm_dp_mst_dump_mstb(m, port->mstb);
2960 }
2961 }
2962
2963 #define DP_PAYLOAD_TABLE_SIZE 64
2964
2965 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2966 char *buf)
2967 {
2968 int i;
2969
2970 for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
2971 if (drm_dp_dpcd_read(mgr->aux,
2972 DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
2973 &buf[i], 16) != 16)
2974 return false;
2975 }
2976 return true;
2977 }
2978
2979 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2980 struct drm_dp_mst_port *port, char *name,
2981 int namelen)
2982 {
2983 struct edid *mst_edid;
2984
2985 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2986 drm_edid_get_monitor_name(mst_edid, name, namelen);
2987 }
2988
2989 /**
2990 * drm_dp_mst_dump_topology(): dump topology to seq file.
2991 * @m: seq_file to dump output to
2992 * @mgr: manager to dump current topology for.
2993 *
2994 * helper to dump MST topology to a seq file for debugfs.
2995 */
2996 void drm_dp_mst_dump_topology(struct seq_file *m,
2997 struct drm_dp_mst_topology_mgr *mgr)
2998 {
2999 int i;
3000 struct drm_dp_mst_port *port;
3001
3002 mutex_lock(&mgr->lock);
3003 if (mgr->mst_primary)
3004 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
3005
3006 /* dump VCPIs */
3007 mutex_unlock(&mgr->lock);
3008
3009 mutex_lock(&mgr->payload_lock);
3010 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
3011 mgr->max_payloads);
3012
3013 for (i = 0; i < mgr->max_payloads; i++) {
3014 if (mgr->proposed_vcpis[i]) {
3015 char name[14];
3016
3017 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
3018 fetch_monitor_name(mgr, port, name, sizeof(name));
3019 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
3020 port->port_num, port->vcpi.vcpi,
3021 port->vcpi.num_slots,
3022 (*name != 0) ? name : "Unknown");
3023 } else
3024 seq_printf(m, "vcpi %d:unused\n", i);
3025 }
3026 for (i = 0; i < mgr->max_payloads; i++) {
3027 seq_printf(m, "payload %d: %d, %d, %d\n",
3028 i,
3029 mgr->payloads[i].payload_state,
3030 mgr->payloads[i].start_slot,
3031 mgr->payloads[i].num_slots);
3032
3033
3034 }
3035 mutex_unlock(&mgr->payload_lock);
3036
3037 mutex_lock(&mgr->lock);
3038 if (mgr->mst_primary) {
3039 u8 buf[DP_PAYLOAD_TABLE_SIZE];
3040 int ret;
3041
3042 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
3043 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
3044 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
3045 seq_printf(m, "faux/mst: %*ph\n", 2, buf);
3046 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
3047 seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
3048
3049 /* dump the standard OUI branch header */
3050 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
3051 seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
3052 for (i = 0x3; i < 0x8 && buf[i]; i++)
3053 seq_printf(m, "%c", buf[i]);
3054 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
3055 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
3056 if (dump_dp_payload_table(mgr, buf))
3057 seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
3058 }
3059
3060 mutex_unlock(&mgr->lock);
3061
3062 }
3063 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
3064
3065 static void drm_dp_tx_work(struct work_struct *work)
3066 {
3067 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
3068
3069 mutex_lock(&mgr->qlock);
3070 if (!list_empty(&mgr->tx_msg_downq))
3071 process_single_down_tx_qlock(mgr);
3072 mutex_unlock(&mgr->qlock);
3073 }
3074
3075 static void drm_dp_free_mst_port(struct kref *kref)
3076 {
3077 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
3078 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
3079 kfree(port);
3080 }
3081
3082 static void drm_dp_destroy_connector_work(struct work_struct *work)
3083 {
3084 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
3085 struct drm_dp_mst_port *port;
3086 bool send_hotplug = false;
3087 /*
3088 * Not a regular list traverse as we have to drop the destroy
3089 * connector lock before destroying the connector, to avoid AB->BA
3090 * ordering between this lock and the config mutex.
3091 */
3092 for (;;) {
3093 mutex_lock(&mgr->destroy_connector_lock);
3094 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
3095 if (!port) {
3096 mutex_unlock(&mgr->destroy_connector_lock);
3097 break;
3098 }
3099 list_del(&port->next);
3100 mutex_unlock(&mgr->destroy_connector_lock);
3101
3102 kref_init(&port->kref);
3103 INIT_LIST_HEAD(&port->next);
3104
3105 mgr->cbs->destroy_connector(mgr, port->connector);
3106
3107 drm_dp_port_teardown_pdt(port, port->pdt);
3108 port->pdt = DP_PEER_DEVICE_NONE;
3109
3110 if (!port->input && port->vcpi.vcpi > 0) {
3111 drm_dp_mst_reset_vcpi_slots(mgr, port);
3112 drm_dp_update_payload_part1(mgr);
3113 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
3114 }
3115
3116 kref_put(&port->kref, drm_dp_free_mst_port);
3117 send_hotplug = true;
3118 }
3119 if (send_hotplug)
3120 (*mgr->cbs->hotplug)(mgr);
3121 }
3122
3123 static struct drm_private_state *
3124 drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
3125 {
3126 struct drm_dp_mst_topology_state *state;
3127
3128 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
3129 if (!state)
3130 return NULL;
3131
3132 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
3133
3134 return &state->base;
3135 }
3136
3137 static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
3138 struct drm_private_state *state)
3139 {
3140 struct drm_dp_mst_topology_state *mst_state =
3141 to_dp_mst_topology_state(state);
3142
3143 kfree(mst_state);
3144 }
3145
3146 static const struct drm_private_state_funcs mst_state_funcs = {
3147 .atomic_duplicate_state = drm_dp_mst_duplicate_state,
3148 .atomic_destroy_state = drm_dp_mst_destroy_state,
3149 };
3150
3151 /**
3152 * drm_atomic_get_mst_topology_state: get MST topology state
3153 *
3154 * @state: global atomic state
3155 * @mgr: MST topology manager, also the private object in this case
3156 *
3157 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3158 * state vtable so that the private object state returned is that of a MST
3159 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3160 * to care of the locking, so warn if don't hold the connection_mutex.
3161 *
3162 * RETURNS:
3163 *
3164 * The MST topology state or error pointer.
3165 */
3166 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3167 struct drm_dp_mst_topology_mgr *mgr)
3168 {
3169 struct drm_device *dev = mgr->dev;
3170
3171 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
3172 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
3173 }
3174 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3175
3176 /**
3177 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3178 * @mgr: manager struct to initialise
3179 * @dev: device providing this structure - for i2c addition.
3180 * @aux: DP helper aux channel to talk to this device
3181 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3182 * @max_payloads: maximum number of payloads this GPU can source
3183 * @conn_base_id: the connector object ID the MST device is connected to.
3184 *
3185 * Return 0 for success, or negative error code on failure
3186 */
3187 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
3188 struct drm_device *dev, struct drm_dp_aux *aux,
3189 int max_dpcd_transaction_bytes,
3190 int max_payloads, int conn_base_id)
3191 {
3192 struct drm_dp_mst_topology_state *mst_state;
3193
3194 mutex_init(&mgr->lock);
3195 mutex_init(&mgr->qlock);
3196 mutex_init(&mgr->payload_lock);
3197 mutex_init(&mgr->destroy_connector_lock);
3198 INIT_LIST_HEAD(&mgr->tx_msg_downq);
3199 INIT_LIST_HEAD(&mgr->destroy_connector_list);
3200 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3201 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
3202 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
3203 init_waitqueue_head(&mgr->tx_waitq);
3204 mgr->dev = dev;
3205 mgr->aux = aux;
3206 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3207 mgr->max_payloads = max_payloads;
3208 mgr->conn_base_id = conn_base_id;
3209 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3210 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3211 return -EINVAL;
3212 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3213 if (!mgr->payloads)
3214 return -ENOMEM;
3215 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3216 if (!mgr->proposed_vcpis)
3217 return -ENOMEM;
3218 set_bit(0, &mgr->payload_mask);
3219 if (test_calc_pbn_mode() < 0)
3220 DRM_ERROR("MST PBN self-test failed\n");
3221
3222 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
3223 if (mst_state == NULL)
3224 return -ENOMEM;
3225
3226 mst_state->mgr = mgr;
3227
3228 /* max. time slots - one slot for MTP header */
3229 mst_state->avail_slots = 63;
3230
3231 drm_atomic_private_obj_init(&mgr->base,
3232 &mst_state->base,
3233 &mst_state_funcs);
3234
3235 return 0;
3236 }
3237 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3238
3239 /**
3240 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3241 * @mgr: manager to destroy
3242 */
3243 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3244 {
3245 flush_work(&mgr->work);
3246 flush_work(&mgr->destroy_connector_work);
3247 mutex_lock(&mgr->payload_lock);
3248 kfree(mgr->payloads);
3249 mgr->payloads = NULL;
3250 kfree(mgr->proposed_vcpis);
3251 mgr->proposed_vcpis = NULL;
3252 mutex_unlock(&mgr->payload_lock);
3253 mgr->dev = NULL;
3254 mgr->aux = NULL;
3255 drm_atomic_private_obj_fini(&mgr->base);
3256 mgr->funcs = NULL;
3257 }
3258 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3259
3260 /* I2C device */
3261 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3262 int num)
3263 {
3264 struct drm_dp_aux *aux = adapter->algo_data;
3265 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3266 struct drm_dp_mst_branch *mstb;
3267 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3268 unsigned int i;
3269 bool reading = false;
3270 struct drm_dp_sideband_msg_req_body msg;
3271 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3272 int ret;
3273
3274 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3275 if (!mstb)
3276 return -EREMOTEIO;
3277
3278 /* construct i2c msg */
3279 /* see if last msg is a read */
3280 if (msgs[num - 1].flags & I2C_M_RD)
3281 reading = true;
3282
3283 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3284 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3285 ret = -EIO;
3286 goto out;
3287 }
3288
3289 memset(&msg, 0, sizeof(msg));
3290 msg.req_type = DP_REMOTE_I2C_READ;
3291 msg.u.i2c_read.num_transactions = num - 1;
3292 msg.u.i2c_read.port_number = port->port_num;
3293 for (i = 0; i < num - 1; i++) {
3294 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3295 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3296 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3297 msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP);
3298 }
3299 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3300 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3301
3302 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3303 if (!txmsg) {
3304 ret = -ENOMEM;
3305 goto out;
3306 }
3307
3308 txmsg->dst = mstb;
3309 drm_dp_encode_sideband_req(&msg, txmsg);
3310
3311 drm_dp_queue_down_tx(mgr, txmsg);
3312
3313 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3314 if (ret > 0) {
3315
3316 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3317 ret = -EREMOTEIO;
3318 goto out;
3319 }
3320 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3321 ret = -EIO;
3322 goto out;
3323 }
3324 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3325 ret = num;
3326 }
3327 out:
3328 kfree(txmsg);
3329 drm_dp_put_mst_branch_device(mstb);
3330 return ret;
3331 }
3332
3333 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3334 {
3335 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3336 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3337 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3338 I2C_FUNC_10BIT_ADDR;
3339 }
3340
3341 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3342 .functionality = drm_dp_mst_i2c_functionality,
3343 .master_xfer = drm_dp_mst_i2c_xfer,
3344 };
3345
3346 /**
3347 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3348 * @aux: DisplayPort AUX channel
3349 *
3350 * Returns 0 on success or a negative error code on failure.
3351 */
3352 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3353 {
3354 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3355 aux->ddc.algo_data = aux;
3356 aux->ddc.retries = 3;
3357
3358 aux->ddc.class = I2C_CLASS_DDC;
3359 aux->ddc.owner = THIS_MODULE;
3360 aux->ddc.dev.parent = aux->dev;
3361 aux->ddc.dev.of_node = aux->dev->of_node;
3362
3363 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3364 sizeof(aux->ddc.name));
3365
3366 return i2c_add_adapter(&aux->ddc);
3367 }
3368
3369 /**
3370 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3371 * @aux: DisplayPort AUX channel
3372 */
3373 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3374 {
3375 i2c_del_adapter(&aux->ddc);
3376 }
Linux with added FPC-III support