projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[linux-2.6-block.git] / drivers / gpu / drm / drm_dp_mst_topology.c
CommitLineData
ad7f8a1f
DA		 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>
75bc08ab 28#include <linux/seq_file.h>
ad7f8a1f
DA		 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
35/**
36 * DOC: dp mst helper
37 *
38 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
39 * protocol. The helpers contain a topology manager and bandwidth manager.
40 * The helpers encapsulate the sending and received of sideband msgs.
41 */
42static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
43 char *buf);
44static int test_calc_pbn_mode(void);
45
46static void drm_dp_put_port(struct drm_dp_mst_port *port);
47
48static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
49 int id,
50 struct drm_dp_payload *payload);
51
52static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
53 struct drm_dp_mst_port *port,
54 int offset, int size, u8 *bytes);
55
68d8c9fc
DA		 56static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
57 struct drm_dp_mst_branch *mstb);
ad7f8a1f
DA		 58static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
59 struct drm_dp_mst_branch *mstb,
60 struct drm_dp_mst_port *port);
61static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
62 u8 *guid);
63
64static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
65static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
66static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
67/* sideband msg handling */
68static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
69{
70 u8 bitmask = 0x80;
71 u8 bitshift = 7;
72 u8 array_index = 0;
73 int number_of_bits = num_nibbles * 4;
74 u8 remainder = 0;
75
76 while (number_of_bits != 0) {
77 number_of_bits--;
78 remainder <<= 1;
79 remainder |= (data[array_index] & bitmask) >> bitshift;
80 bitmask >>= 1;
81 bitshift--;
82 if (bitmask == 0) {
83 bitmask = 0x80;
84 bitshift = 7;
85 array_index++;
86 }
87 if ((remainder & 0x10) == 0x10)
88 remainder ^= 0x13;
89 }
90
91 number_of_bits = 4;
92 while (number_of_bits != 0) {
93 number_of_bits--;
94 remainder <<= 1;
95 if ((remainder & 0x10) != 0)
96 remainder ^= 0x13;
97 }
98
99 return remainder;
100}
101
102static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
103{
104 u8 bitmask = 0x80;
105 u8 bitshift = 7;
106 u8 array_index = 0;
107 int number_of_bits = number_of_bytes * 8;
108 u16 remainder = 0;
109
110 while (number_of_bits != 0) {
111 number_of_bits--;
112 remainder <<= 1;
113 remainder |= (data[array_index] & bitmask) >> bitshift;
114 bitmask >>= 1;
115 bitshift--;
116 if (bitmask == 0) {
117 bitmask = 0x80;
118 bitshift = 7;
119 array_index++;
120 }
121 if ((remainder & 0x100) == 0x100)
122 remainder ^= 0xd5;
123 }
124
125 number_of_bits = 8;
126 while (number_of_bits != 0) {
127 number_of_bits--;
128 remainder <<= 1;
129 if ((remainder & 0x100) != 0)
130 remainder ^= 0xd5;
131 }
132
133 return remainder & 0xff;
134}
135static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
136{
137 u8 size = 3;
138 size += (hdr->lct / 2);
139 return size;
140}
141
142static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
143 u8 *buf, int *len)
144{
145 int idx = 0;
146 int i;
147 u8 crc4;
148 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
149 for (i = 0; i < (hdr->lct / 2); i++)
150 buf[idx++] = hdr->rad[i];
151 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
152 (hdr->msg_len & 0x3f);
153 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
154
155 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
156 buf[idx - 1] |= (crc4 & 0xf);
157
158 *len = idx;
159}
160
161static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
162 u8 *buf, int buflen, u8 *hdrlen)
163{
164 u8 crc4;
165 u8 len;
166 int i;
167 u8 idx;
168 if (buf[0] == 0)
169 return false;
170 len = 3;
171 len += ((buf[0] & 0xf0) >> 4) / 2;
172 if (len > buflen)
173 return false;
174 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
175
176 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
177 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
178 return false;
179 }
180
181 hdr->lct = (buf[0] & 0xf0) >> 4;
182 hdr->lcr = (buf[0] & 0xf);
183 idx = 1;
184 for (i = 0; i < (hdr->lct / 2); i++)
185 hdr->rad[i] = buf[idx++];
186 hdr->broadcast = (buf[idx] >> 7) & 0x1;
187 hdr->path_msg = (buf[idx] >> 6) & 0x1;
188 hdr->msg_len = buf[idx] & 0x3f;
189 idx++;
190 hdr->somt = (buf[idx] >> 7) & 0x1;
191 hdr->eomt = (buf[idx] >> 6) & 0x1;
192 hdr->seqno = (buf[idx] >> 4) & 0x1;
193 idx++;
194 *hdrlen = idx;
195 return true;
196}
197
198static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
199 struct drm_dp_sideband_msg_tx *raw)
200{
201 int idx = 0;
202 int i;
203 u8 *buf = raw->msg;
204 buf[idx++] = req->req_type & 0x7f;
205
206 switch (req->req_type) {
207 case DP_ENUM_PATH_RESOURCES:
208 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
209 idx++;
210 break;
211 case DP_ALLOCATE_PAYLOAD:
212 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
213 (req->u.allocate_payload.number_sdp_streams & 0xf);
214 idx++;
215 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
216 idx++;
217 buf[idx] = (req->u.allocate_payload.pbn >> 8);
218 idx++;
219 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
220 idx++;
221 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
222 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
223 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
224 idx++;
225 }
226 if (req->u.allocate_payload.number_sdp_streams & 1) {
227 i = req->u.allocate_payload.number_sdp_streams - 1;
228 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
229 idx++;
230 }
231 break;
232 case DP_QUERY_PAYLOAD:
233 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
234 idx++;
235 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
236 idx++;
237 break;
238 case DP_REMOTE_DPCD_READ:
239 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
240 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
241 idx++;
242 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
243 idx++;
244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
245 idx++;
246 buf[idx] = (req->u.dpcd_read.num_bytes);
247 idx++;
248 break;
249
250 case DP_REMOTE_DPCD_WRITE:
251 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
252 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
253 idx++;
254 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
255 idx++;
256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
257 idx++;
258 buf[idx] = (req->u.dpcd_write.num_bytes);
259 idx++;
260 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
261 idx += req->u.dpcd_write.num_bytes;
262 break;
263 case DP_REMOTE_I2C_READ:
264 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
265 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
266 idx++;
267 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
268 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
269 idx++;
270 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
271 idx++;
272 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
273 idx += req->u.i2c_read.transactions[i].num_bytes;
274
275 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
276 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
277 idx++;
278 }
279 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
280 idx++;
281 buf[idx] = (req->u.i2c_read.num_bytes_read);
282 idx++;
283 break;
284
285 case DP_REMOTE_I2C_WRITE:
286 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
287 idx++;
288 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
289 idx++;
290 buf[idx] = (req->u.i2c_write.num_bytes);
291 idx++;
292 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
293 idx += req->u.i2c_write.num_bytes;
294 break;
295 }
296 raw->cur_len = idx;
297}
298
299static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
300{
301 u8 crc4;
302 crc4 = drm_dp_msg_data_crc4(msg, len);
303 msg[len] = crc4;
304}
305
306static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
307 struct drm_dp_sideband_msg_tx *raw)
308{
309 int idx = 0;
310 u8 *buf = raw->msg;
311
312 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
313
314 raw->cur_len = idx;
315}
316
317/* this adds a chunk of msg to the builder to get the final msg */
318static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
319 u8 *replybuf, u8 replybuflen, bool hdr)
320{
321 int ret;
322 u8 crc4;
323
324 if (hdr) {
325 u8 hdrlen;
326 struct drm_dp_sideband_msg_hdr recv_hdr;
327 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
328 if (ret == false) {
329 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
330 return false;
331 }
332
333 /* get length contained in this portion */
334 msg->curchunk_len = recv_hdr.msg_len;
335 msg->curchunk_hdrlen = hdrlen;
336
337 /* we have already gotten an somt - don't bother parsing */
338 if (recv_hdr.somt && msg->have_somt)
339 return false;
340
341 if (recv_hdr.somt) {
342 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
343 msg->have_somt = true;
344 }
345 if (recv_hdr.eomt)
346 msg->have_eomt = true;
347
348 /* copy the bytes for the remainder of this header chunk */
349 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
350 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
351 } else {
352 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
353 msg->curchunk_idx += replybuflen;
354 }
355
356 if (msg->curchunk_idx >= msg->curchunk_len) {
357 /* do CRC */
358 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
359 /* copy chunk into bigger msg */
360 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
361 msg->curlen += msg->curchunk_len - 1;
362 }
363 return true;
364}
365
366static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
367 struct drm_dp_sideband_msg_reply_body *repmsg)
368{
369 int idx = 1;
370 int i;
371 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
372 idx += 16;
373 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
374 idx++;
375 if (idx > raw->curlen)
376 goto fail_len;
377 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
378 if (raw->msg[idx] & 0x80)
379 repmsg->u.link_addr.ports[i].input_port = 1;
380
381 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
382 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
383
384 idx++;
385 if (idx > raw->curlen)
386 goto fail_len;
387 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
388 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
389 if (repmsg->u.link_addr.ports[i].input_port == 0)
390 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
391 idx++;
392 if (idx > raw->curlen)
393 goto fail_len;
394 if (repmsg->u.link_addr.ports[i].input_port == 0) {
395 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
396 idx++;
397 if (idx > raw->curlen)
398 goto fail_len;
399 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
400 idx += 16;
401 if (idx > raw->curlen)
402 goto fail_len;
403 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
404 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
405 idx++;
406
407 }
408 if (idx > raw->curlen)
409 goto fail_len;
410 }
411
412 return true;
413fail_len:
414 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
415 return false;
416}
417
418static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
419 struct drm_dp_sideband_msg_reply_body *repmsg)
420{
421 int idx = 1;
422 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
423 idx++;
424 if (idx > raw->curlen)
425 goto fail_len;
426 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
427 if (idx > raw->curlen)
428 goto fail_len;
429
430 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
431 return true;
432fail_len:
433 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
434 return false;
435}
436
437static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
438 struct drm_dp_sideband_msg_reply_body *repmsg)
439{
440 int idx = 1;
441 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
442 idx++;
443 if (idx > raw->curlen)
444 goto fail_len;
445 return true;
446fail_len:
447 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
448 return false;
449}
450
451static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
452 struct drm_dp_sideband_msg_reply_body *repmsg)
453{
454 int idx = 1;
455
456 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
457 idx++;
458 if (idx > raw->curlen)
459 goto fail_len;
460 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
461 idx++;
462 /* TODO check */
463 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
464 return true;
465fail_len:
466 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
467 return false;
468}
469
470static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
471 struct drm_dp_sideband_msg_reply_body *repmsg)
472{
473 int idx = 1;
474 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
475 idx++;
476 if (idx > raw->curlen)
477 goto fail_len;
478 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
479 idx += 2;
480 if (idx > raw->curlen)
481 goto fail_len;
482 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
483 idx += 2;
484 if (idx > raw->curlen)
485 goto fail_len;
486 return true;
487fail_len:
488 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
489 return false;
490}
491
492static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
493 struct drm_dp_sideband_msg_reply_body *repmsg)
494{
495 int idx = 1;
496 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
497 idx++;
498 if (idx > raw->curlen)
499 goto fail_len;
500 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
501 idx++;
502 if (idx > raw->curlen)
503 goto fail_len;
504 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
505 idx += 2;
506 if (idx > raw->curlen)
507 goto fail_len;
508 return true;
509fail_len:
510 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
511 return false;
512}
513
514static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
515 struct drm_dp_sideband_msg_reply_body *repmsg)
516{
517 int idx = 1;
518 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
519 idx++;
520 if (idx > raw->curlen)
521 goto fail_len;
522 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
523 idx += 2;
524 if (idx > raw->curlen)
525 goto fail_len;
526 return true;
527fail_len:
528 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
529 return false;
530}
531
532static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
533 struct drm_dp_sideband_msg_reply_body *msg)
534{
535 memset(msg, 0, sizeof(*msg));
536 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
537 msg->req_type = (raw->msg[0] & 0x7f);
538
539 if (msg->reply_type) {
540 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
541 msg->u.nak.reason = raw->msg[17];
542 msg->u.nak.nak_data = raw->msg[18];
543 return false;
544 }
545
546 switch (msg->req_type) {
547 case DP_LINK_ADDRESS:
548 return drm_dp_sideband_parse_link_address(raw, msg);
549 case DP_QUERY_PAYLOAD:
550 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
551 case DP_REMOTE_DPCD_READ:
552 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
553 case DP_REMOTE_DPCD_WRITE:
554 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
555 case DP_REMOTE_I2C_READ:
556 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
557 case DP_ENUM_PATH_RESOURCES:
558 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
559 case DP_ALLOCATE_PAYLOAD:
560 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
561 default:
562 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
563 return false;
564 }
565}
566
567static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
568 struct drm_dp_sideband_msg_req_body *msg)
569{
570 int idx = 1;
571
572 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
573 idx++;
574 if (idx > raw->curlen)
575 goto fail_len;
576
577 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
578 idx += 16;
579 if (idx > raw->curlen)
580 goto fail_len;
581
582 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
583 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
584 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
585 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
586 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
587 idx++;
588 return true;
589fail_len:
590 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
591 return false;
592}
593
594static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
595 struct drm_dp_sideband_msg_req_body *msg)
596{
597 int idx = 1;
598
599 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
600 idx++;
601 if (idx > raw->curlen)
602 goto fail_len;
603
604 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
605 idx += 16;
606 if (idx > raw->curlen)
607 goto fail_len;
608
609 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
610 idx++;
611 return true;
612fail_len:
613 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
614 return false;
615}
616
617static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
618 struct drm_dp_sideband_msg_req_body *msg)
619{
620 memset(msg, 0, sizeof(*msg));
621 msg->req_type = (raw->msg[0] & 0x7f);
622
623 switch (msg->req_type) {
624 case DP_CONNECTION_STATUS_NOTIFY:
625 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
626 case DP_RESOURCE_STATUS_NOTIFY:
627 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
628 default:
629 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
630 return false;
631 }
632}
633
634static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
635{
636 struct drm_dp_sideband_msg_req_body req;
637
638 req.req_type = DP_REMOTE_DPCD_WRITE;
639 req.u.dpcd_write.port_number = port_num;
640 req.u.dpcd_write.dpcd_address = offset;
641 req.u.dpcd_write.num_bytes = num_bytes;
642 req.u.dpcd_write.bytes = bytes;
643 drm_dp_encode_sideband_req(&req, msg);
644
645 return 0;
646}
647
648static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
649{
650 struct drm_dp_sideband_msg_req_body req;
651
652 req.req_type = DP_LINK_ADDRESS;
653 drm_dp_encode_sideband_req(&req, msg);
654 return 0;
655}
656
657static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
658{
659 struct drm_dp_sideband_msg_req_body req;
660
661 req.req_type = DP_ENUM_PATH_RESOURCES;
662 req.u.port_num.port_number = port_num;
663 drm_dp_encode_sideband_req(&req, msg);
664 msg->path_msg = true;
665 return 0;
666}
667
668static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
ef8f9bea
LY		 669 u8 vcpi, uint16_t pbn,
670 u8 number_sdp_streams,
671 u8 *sdp_stream_sink)
ad7f8a1f
DA		 672{
673 struct drm_dp_sideband_msg_req_body req;
674 memset(&req, 0, sizeof(req));
675 req.req_type = DP_ALLOCATE_PAYLOAD;
676 req.u.allocate_payload.port_number = port_num;
677 req.u.allocate_payload.vcpi = vcpi;
678 req.u.allocate_payload.pbn = pbn;
ef8f9bea
LY		 679 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
680 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
681 number_sdp_streams);
ad7f8a1f
DA		 682 drm_dp_encode_sideband_req(&req, msg);
683 msg->path_msg = true;
684 return 0;
685}
686
687static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
688 struct drm_dp_vcpi *vcpi)
689{
dfda0df3 690 int ret, vcpi_ret;
ad7f8a1f
DA		 691
692 mutex_lock(&mgr->payload_lock);
693 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
694 if (ret > mgr->max_payloads) {
695 ret = -EINVAL;
696 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
697 goto out_unlock;
698 }
699
dfda0df3
DA		 700 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
701 if (vcpi_ret > mgr->max_payloads) {
702 ret = -EINVAL;
703 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
704 goto out_unlock;
705 }
706
ad7f8a1f 707 set_bit(ret, &mgr->payload_mask);
dfda0df3
DA		 708 set_bit(vcpi_ret, &mgr->vcpi_mask);
709 vcpi->vcpi = vcpi_ret + 1;
ad7f8a1f
DA		 710 mgr->proposed_vcpis[ret - 1] = vcpi;
711out_unlock:
712 mutex_unlock(&mgr->payload_lock);
713 return ret;
714}
715
716static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
dfda0df3 717 int vcpi)
ad7f8a1f 718{
dfda0df3
DA		 719 int i;
720 if (vcpi == 0)
ad7f8a1f
DA		 721 return;
722
723 mutex_lock(&mgr->payload_lock);
dfda0df3
DA		 724 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
725 clear_bit(vcpi - 1, &mgr->vcpi_mask);
726
727 for (i = 0; i < mgr->max_payloads; i++) {
728 if (mgr->proposed_vcpis[i])
729 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
730 mgr->proposed_vcpis[i] = NULL;
731 clear_bit(i + 1, &mgr->payload_mask);
732 }
733 }
ad7f8a1f
DA		 734 mutex_unlock(&mgr->payload_lock);
735}
736
737static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
738 struct drm_dp_sideband_msg_tx *txmsg)
739{
740 bool ret;
cd961bb9
DV		 741
742 /*
743 * All updates to txmsg->state are protected by mgr->qlock, and the two
744 * cases we check here are terminal states. For those the barriers
745 * provided by the wake_up/wait_event pair are enough.
746 */
ad7f8a1f
DA		 747 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX ||
748 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT);
ad7f8a1f
DA		 749 return ret;
750}
751
752static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
753 struct drm_dp_sideband_msg_tx *txmsg)
754{
755 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
756 int ret;
757
758 ret = wait_event_timeout(mgr->tx_waitq,
759 check_txmsg_state(mgr, txmsg),
760 (4 * HZ));
761 mutex_lock(&mstb->mgr->qlock);
762 if (ret > 0) {
763 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
764 ret = -EIO;
765 goto out;
766 }
767 } else {
768 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
769
770 /* dump some state */
771 ret = -EIO;
772
773 /* remove from q */
774 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
775 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
776 list_del(&txmsg->next);
777 }
778
779 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
780 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
781 mstb->tx_slots[txmsg->seqno] = NULL;
782 }
783 }
784out:
785 mutex_unlock(&mgr->qlock);
786
787 return ret;
788}
789
790static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
791{
792 struct drm_dp_mst_branch *mstb;
793
794 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
795 if (!mstb)
796 return NULL;
797
798 mstb->lct = lct;
799 if (lct > 1)
800 memcpy(mstb->rad, rad, lct / 2);
801 INIT_LIST_HEAD(&mstb->ports);
802 kref_init(&mstb->kref);
803 return mstb;
804}
805
806static void drm_dp_destroy_mst_branch_device(struct kref *kref)
807{
808 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
809 struct drm_dp_mst_port *port, *tmp;
810 bool wake_tx = false;
811
ad7f8a1f
DA		 812 /*
813 * destroy all ports - don't need lock
814 * as there are no more references to the mst branch
815 * device at this point.
816 */
817 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
818 list_del(&port->next);
819 drm_dp_put_port(port);
820 }
821
822 /* drop any tx slots msg */
823 mutex_lock(&mstb->mgr->qlock);
824 if (mstb->tx_slots[0]) {
825 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
826 mstb->tx_slots[0] = NULL;
827 wake_tx = true;
828 }
829 if (mstb->tx_slots[1]) {
830 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
831 mstb->tx_slots[1] = NULL;
832 wake_tx = true;
833 }
834 mutex_unlock(&mstb->mgr->qlock);
835
836 if (wake_tx)
837 wake_up(&mstb->mgr->tx_waitq);
838 kfree(mstb);
839}
840
841static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
842{
843 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
844}
845
846
847static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
848{
0391359d
DV		 849 struct drm_dp_mst_branch *mstb;
850
ad7f8a1f
DA		 851 switch (old_pdt) {
852 case DP_PEER_DEVICE_DP_LEGACY_CONV:
853 case DP_PEER_DEVICE_SST_SINK:
854 /* remove i2c over sideband */
855 drm_dp_mst_unregister_i2c_bus(&port->aux);
856 break;
857 case DP_PEER_DEVICE_MST_BRANCHING:
0391359d 858 mstb = port->mstb;
ad7f8a1f 859 port->mstb = NULL;
0391359d 860 drm_dp_put_mst_branch_device(mstb);
ad7f8a1f
DA		 861 break;
862 }
863}
864
865static void drm_dp_destroy_port(struct kref *kref)
866{
867 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
868 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
df4839fd 869
ad7f8a1f
DA		 870 if (!port->input) {
871 port->vcpi.num_slots = 0;
c6a0aed4
DA		 872
873 kfree(port->cached_edid);
6b8eeca6 874
df4839fd
DA		 875 /*
876 * The only time we don't have a connector
877 * on an output port is if the connector init
878 * fails.
879 */
6b8eeca6 880 if (port->connector) {
df4839fd
DA		 881 /* we can't destroy the connector here, as
882 * we might be holding the mode_config.mutex
883 * from an EDID retrieval */
884
6b8eeca6 885 mutex_lock(&mgr->destroy_connector_lock);
4772ff03 886 list_add(&port->next, &mgr->destroy_connector_list);
6b8eeca6
DA		 887 mutex_unlock(&mgr->destroy_connector_lock);
888 schedule_work(&mgr->destroy_connector_work);
4772ff03 889 return;
6b8eeca6 890 }
df4839fd
DA		 891 /* no need to clean up vcpi
892 * as if we have no connector we never setup a vcpi */
ad7f8a1f 893 drm_dp_port_teardown_pdt(port, port->pdt);
ad7f8a1f
DA		 894 }
895 kfree(port);
ad7f8a1f
DA		 896}
897
898static void drm_dp_put_port(struct drm_dp_mst_port *port)
899{
900 kref_put(&port->kref, drm_dp_destroy_port);
901}
902
903static 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)
904{
905 struct drm_dp_mst_port *port;
906 struct drm_dp_mst_branch *rmstb;
907 if (to_find == mstb) {
908 kref_get(&mstb->kref);
909 return mstb;
910 }
911 list_for_each_entry(port, &mstb->ports, next) {
912 if (port->mstb) {
913 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
914 if (rmstb)
915 return rmstb;
916 }
917 }
918 return NULL;
919}
920
921static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
922{
923 struct drm_dp_mst_branch *rmstb = NULL;
924 mutex_lock(&mgr->lock);
925 if (mgr->mst_primary)
926 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
927 mutex_unlock(&mgr->lock);
928 return rmstb;
929}
930
931static 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)
932{
933 struct drm_dp_mst_port *port, *mport;
934
935 list_for_each_entry(port, &mstb->ports, next) {
936 if (port == to_find) {
937 kref_get(&port->kref);
938 return port;
939 }
940 if (port->mstb) {
941 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
942 if (mport)
943 return mport;
944 }
945 }
946 return NULL;
947}
948
949static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
950{
951 struct drm_dp_mst_port *rport = NULL;
952 mutex_lock(&mgr->lock);
953 if (mgr->mst_primary)
954 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
955 mutex_unlock(&mgr->lock);
956 return rport;
957}
958
959static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
960{
961 struct drm_dp_mst_port *port;
962
963 list_for_each_entry(port, &mstb->ports, next) {
964 if (port->port_num == port_num) {
965 kref_get(&port->kref);
966 return port;
967 }
968 }
969
970 return NULL;
971}
972
973/*
974 * calculate a new RAD for this MST branch device
975 * if parent has an LCT of 2 then it has 1 nibble of RAD,
976 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
977 */
978static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
979 u8 *rad)
980{
75af4c8c 981 int parent_lct = port->parent->lct;
ad7f8a1f 982 int shift = 4;
75af4c8c
ML		 983 int idx = (parent_lct - 1) / 2;
984 if (parent_lct > 1) {
985 memcpy(rad, port->parent->rad, idx + 1);
986 shift = (parent_lct % 2) ? 4 : 0;
ad7f8a1f
DA		 987 } else
988 rad[0] = 0;
989
990 rad[idx] |= port->port_num << shift;
75af4c8c 991 return parent_lct + 1;
ad7f8a1f
DA		 992}
993
994/*
995 * return sends link address for new mstb
996 */
997static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
998{
999 int ret;
1000 u8 rad[6], lct;
1001 bool send_link = false;
1002 switch (port->pdt) {
1003 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1004 case DP_PEER_DEVICE_SST_SINK:
1005 /* add i2c over sideband */
1006 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1007 break;
1008 case DP_PEER_DEVICE_MST_BRANCHING:
1009 lct = drm_dp_calculate_rad(port, rad);
1010
1011 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1012 port->mstb->mgr = port->mgr;
1013 port->mstb->port_parent = port;
1014
1015 send_link = true;
1016 break;
1017 }
1018 return send_link;
1019}
1020
1021static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb,
1022 struct drm_dp_mst_port *port)
1023{
1024 int ret;
1025 if (port->dpcd_rev >= 0x12) {
1026 port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid);
1027 if (!port->guid_valid) {
1028 ret = drm_dp_send_dpcd_write(mstb->mgr,
1029 port,
1030 DP_GUID,
1031 16, port->guid);
1032 port->guid_valid = true;
1033 }
1034 }
1035}
1036
1c960876
DA		 1037static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1038 int pnum,
d87af4d1
RS		 1039 char *proppath,
1040 size_t proppath_size)
ad7f8a1f
DA		 1041{
1042 int i;
1043 char temp[8];
d87af4d1 1044 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
ad7f8a1f
DA		 1045 for (i = 0; i < (mstb->lct - 1); i++) {
1046 int shift = (i % 2) ? 0 : 4;
7a11a334 1047 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
d87af4d1
RS		 1048 snprintf(temp, sizeof(temp), "-%d", port_num);
1049 strlcat(proppath, temp, proppath_size);
ad7f8a1f 1050 }
1c960876 1051 snprintf(temp, sizeof(temp), "-%d", pnum);
d87af4d1 1052 strlcat(proppath, temp, proppath_size);
ad7f8a1f
DA		 1053}
1054
1055static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1056 struct device *dev,
1057 struct drm_dp_link_addr_reply_port *port_msg)
1058{
1059 struct drm_dp_mst_port *port;
1060 bool ret;
1061 bool created = false;
1062 int old_pdt = 0;
1063 int old_ddps = 0;
1064 port = drm_dp_get_port(mstb, port_msg->port_number);
1065 if (!port) {
1066 port = kzalloc(sizeof(*port), GFP_KERNEL);
1067 if (!port)
1068 return;
1069 kref_init(&port->kref);
1070 port->parent = mstb;
1071 port->port_num = port_msg->port_number;
1072 port->mgr = mstb->mgr;
1073 port->aux.name = "DPMST";
1074 port->aux.dev = dev;
1075 created = true;
1076 } else {
1077 old_pdt = port->pdt;
1078 old_ddps = port->ddps;
1079 }
1080
1081 port->pdt = port_msg->peer_device_type;
1082 port->input = port_msg->input_port;
1083 port->mcs = port_msg->mcs;
1084 port->ddps = port_msg->ddps;
1085 port->ldps = port_msg->legacy_device_plug_status;
1086 port->dpcd_rev = port_msg->dpcd_revision;
1087 port->num_sdp_streams = port_msg->num_sdp_streams;
1088 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1089 memcpy(port->guid, port_msg->peer_guid, 16);
1090
1091 /* manage mstb port lists with mgr lock - take a reference
1092 for this list */
1093 if (created) {
1094 mutex_lock(&mstb->mgr->lock);
1095 kref_get(&port->kref);
1096 list_add(&port->next, &mstb->ports);
1097 mutex_unlock(&mstb->mgr->lock);
1098 }
1099
1100 if (old_ddps != port->ddps) {
1101 if (port->ddps) {
1102 drm_dp_check_port_guid(mstb, port);
1103 if (!port->input)
1104 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1105 } else {
1106 port->guid_valid = false;
1107 port->available_pbn = 0;
1108 }
1109 }
1110
1111 if (old_pdt != port->pdt && !port->input) {
1112 drm_dp_port_teardown_pdt(port, old_pdt);
1113
1114 ret = drm_dp_port_setup_pdt(port);
68d8c9fc 1115 if (ret == true)
ad7f8a1f 1116 drm_dp_send_link_address(mstb->mgr, port->mstb);
ad7f8a1f
DA		 1117 }
1118
1119 if (created && !port->input) {
1120 char proppath[255];
1c960876
DA		 1121
1122 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
ad7f8a1f 1123 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
df4839fd
DA		 1124 if (!port->connector) {
1125 /* remove it from the port list */
1126 mutex_lock(&mstb->mgr->lock);
1127 list_del(&port->next);
1128 mutex_unlock(&mstb->mgr->lock);
1129 /* drop port list reference */
1130 drm_dp_put_port(port);
1131 goto out;
1132 }
ccf03d69 1133 if (port->port_num >= DP_MST_LOGICAL_PORT_0) {
c6a0aed4 1134 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
d9515c5e 1135 drm_mode_connector_set_tile_property(port->connector);
c6a0aed4 1136 }
d9515c5e 1137 (*mstb->mgr->cbs->register_connector)(port->connector);
ad7f8a1f
DA		 1138 }
1139
df4839fd 1140out:
ad7f8a1f
DA		 1141 /* put reference to this port */
1142 drm_dp_put_port(port);
1143}
1144
1145static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1146 struct drm_dp_connection_status_notify *conn_stat)
1147{
1148 struct drm_dp_mst_port *port;
1149 int old_pdt;
1150 int old_ddps;
1151 bool dowork = false;
1152 port = drm_dp_get_port(mstb, conn_stat->port_number);
1153 if (!port)
1154 return;
1155
1156 old_ddps = port->ddps;
1157 old_pdt = port->pdt;
1158 port->pdt = conn_stat->peer_device_type;
1159 port->mcs = conn_stat->message_capability_status;
1160 port->ldps = conn_stat->legacy_device_plug_status;
1161 port->ddps = conn_stat->displayport_device_plug_status;
1162
1163 if (old_ddps != port->ddps) {
1164 if (port->ddps) {
1165 drm_dp_check_port_guid(mstb, port);
1166 dowork = true;
1167 } else {
1168 port->guid_valid = false;
1169 port->available_pbn = 0;
1170 }
1171 }
1172 if (old_pdt != port->pdt && !port->input) {
1173 drm_dp_port_teardown_pdt(port, old_pdt);
1174
1175 if (drm_dp_port_setup_pdt(port))
1176 dowork = true;
1177 }
1178
1179 drm_dp_put_port(port);
1180 if (dowork)
1181 queue_work(system_long_wq, &mstb->mgr->work);
1182
1183}
1184
1185static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1186 u8 lct, u8 *rad)
1187{
1188 struct drm_dp_mst_branch *mstb;
1189 struct drm_dp_mst_port *port;
1190 int i;
1191 /* find the port by iterating down */
9eb1e57f
DA		 1192
1193 mutex_lock(&mgr->lock);
ad7f8a1f
DA		 1194 mstb = mgr->mst_primary;
1195
1196 for (i = 0; i < lct - 1; i++) {
1197 int shift = (i % 2) ? 0 : 4;
7a11a334 1198 int port_num = (rad[i / 2] >> shift) & 0xf;
ad7f8a1f
DA		 1199
1200 list_for_each_entry(port, &mstb->ports, next) {
1201 if (port->port_num == port_num) {
30730c7f
AR		 1202 mstb = port->mstb;
1203 if (!mstb) {
ad7f8a1f 1204 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
30730c7f 1205 goto out;
ad7f8a1f
DA		 1206 }
1207
ad7f8a1f
DA		 1208 break;
1209 }
1210 }
1211 }
1212 kref_get(&mstb->kref);
30730c7f 1213out:
9eb1e57f 1214 mutex_unlock(&mgr->lock);
ad7f8a1f
DA		 1215 return mstb;
1216}
1217
bd934320
ML		 1218static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1219 struct drm_dp_mst_branch *mstb,
1220 uint8_t *guid)
1221{
1222 struct drm_dp_mst_branch *found_mstb;
1223 struct drm_dp_mst_port *port;
1224
1225 list_for_each_entry(port, &mstb->ports, next) {
1226 if (!port->mstb)
1227 continue;
1228
1229 if (port->guid_valid && memcmp(port->guid, guid, 16) == 0)
1230 return port->mstb;
1231
1232 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1233
1234 if (found_mstb)
1235 return found_mstb;
1236 }
1237
1238 return NULL;
1239}
1240
1241static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1242 struct drm_dp_mst_topology_mgr *mgr,
1243 uint8_t *guid)
1244{
1245 struct drm_dp_mst_branch *mstb;
1246
1247 /* find the port by iterating down */
1248 mutex_lock(&mgr->lock);
1249
1250 if (mgr->guid_valid && memcmp(mgr->guid, guid, 16) == 0)
1251 mstb = mgr->mst_primary;
1252 else
1253 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1254
1255 if (mstb)
1256 kref_get(&mstb->kref);
1257
1258 mutex_unlock(&mgr->lock);
1259 return mstb;
1260}
1261
ad7f8a1f
DA		 1262static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1263 struct drm_dp_mst_branch *mstb)
1264{
1265 struct drm_dp_mst_port *port;
9254ec49 1266 struct drm_dp_mst_branch *mstb_child;
68d8c9fc 1267 if (!mstb->link_address_sent)
ad7f8a1f 1268 drm_dp_send_link_address(mgr, mstb);
68d8c9fc 1269
ad7f8a1f
DA		 1270 list_for_each_entry(port, &mstb->ports, next) {
1271 if (port->input)
1272 continue;
1273
1274 if (!port->ddps)
1275 continue;
1276
1277 if (!port->available_pbn)
1278 drm_dp_send_enum_path_resources(mgr, mstb, port);
1279
9254ec49
DV		 1280 if (port->mstb) {
1281 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1282 if (mstb_child) {
1283 drm_dp_check_and_send_link_address(mgr, mstb_child);
1284 drm_dp_put_mst_branch_device(mstb_child);
1285 }
1286 }
ad7f8a1f
DA		 1287 }
1288}
1289
1290static void drm_dp_mst_link_probe_work(struct work_struct *work)
1291{
1292 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
9254ec49 1293 struct drm_dp_mst_branch *mstb;
ad7f8a1f 1294
9254ec49
DV		 1295 mutex_lock(&mgr->lock);
1296 mstb = mgr->mst_primary;
1297 if (mstb) {
1298 kref_get(&mstb->kref);
1299 }
1300 mutex_unlock(&mgr->lock);
1301 if (mstb) {
1302 drm_dp_check_and_send_link_address(mgr, mstb);
1303 drm_dp_put_mst_branch_device(mstb);
1304 }
ad7f8a1f
DA		 1305}
1306
1307static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1308 u8 *guid)
1309{
1310 static u8 zero_guid[16];
1311
1312 if (!memcmp(guid, zero_guid, 16)) {
1313 u64 salt = get_jiffies_64();
1314 memcpy(&guid[0], &salt, sizeof(u64));
1315 memcpy(&guid[8], &salt, sizeof(u64));
1316 return false;
1317 }
1318 return true;
1319}
1320
1321#if 0
1322static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1323{
1324 struct drm_dp_sideband_msg_req_body req;
1325
1326 req.req_type = DP_REMOTE_DPCD_READ;
1327 req.u.dpcd_read.port_number = port_num;
1328 req.u.dpcd_read.dpcd_address = offset;
1329 req.u.dpcd_read.num_bytes = num_bytes;
1330 drm_dp_encode_sideband_req(&req, msg);
1331
1332 return 0;
1333}
1334#endif
1335
1336static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1337 bool up, u8 *msg, int len)
1338{
1339 int ret;
1340 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1341 int tosend, total, offset;
1342 int retries = 0;
1343
1344retry:
1345 total = len;
1346 offset = 0;
1347 do {
1348 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1349
1350 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1351 &msg[offset],
1352 tosend);
1353 if (ret != tosend) {
1354 if (ret == -EIO && retries < 5) {
1355 retries++;
1356 goto retry;
1357 }
1358 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
ad7f8a1f
DA		 1359
1360 return -EIO;
1361 }
1362 offset += tosend;
1363 total -= tosend;
1364 } while (total > 0);
1365 return 0;
1366}
1367
1368static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1369 struct drm_dp_sideband_msg_tx *txmsg)
1370{
1371 struct drm_dp_mst_branch *mstb = txmsg->dst;
bd934320 1372 u8 req_type;
ad7f8a1f
DA		 1373
1374 /* both msg slots are full */
1375 if (txmsg->seqno == -1) {
1376 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1377 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1378 return -EAGAIN;
1379 }
1380 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1381 txmsg->seqno = mstb->last_seqno;
1382 mstb->last_seqno ^= 1;
1383 } else if (mstb->tx_slots[0] == NULL)
1384 txmsg->seqno = 0;
1385 else
1386 txmsg->seqno = 1;
1387 mstb->tx_slots[txmsg->seqno] = txmsg;
1388 }
bd934320
ML		 1389
1390 req_type = txmsg->msg[0] & 0x7f;
1391 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1392 req_type == DP_RESOURCE_STATUS_NOTIFY)
1393 hdr->broadcast = 1;
1394 else
1395 hdr->broadcast = 0;
ad7f8a1f
DA		 1396 hdr->path_msg = txmsg->path_msg;
1397 hdr->lct = mstb->lct;
1398 hdr->lcr = mstb->lct - 1;
1399 if (mstb->lct > 1)
1400 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1401 hdr->seqno = txmsg->seqno;
1402 return 0;
1403}
1404/*
1405 * process a single block of the next message in the sideband queue
1406 */
1407static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1408 struct drm_dp_sideband_msg_tx *txmsg,
1409 bool up)
1410{
1411 u8 chunk[48];
1412 struct drm_dp_sideband_msg_hdr hdr;
1413 int len, space, idx, tosend;
1414 int ret;
1415
bf3719c0
DL		 1416 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1417
ad7f8a1f
DA		 1418 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1419 txmsg->seqno = -1;
1420 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1421 }
1422
1423 /* make hdr from dst mst - for replies use seqno
1424 otherwise assign one */
1425 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1426 if (ret < 0)
1427 return ret;
1428
1429 /* amount left to send in this message */
1430 len = txmsg->cur_len - txmsg->cur_offset;
1431
1432 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1433 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1434
1435 tosend = min(len, space);
1436 if (len == txmsg->cur_len)
1437 hdr.somt = 1;
1438 if (space >= len)
1439 hdr.eomt = 1;
1440
1441
1442 hdr.msg_len = tosend + 1;
1443 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1444 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1445 /* add crc at end */
1446 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1447 idx += tosend + 1;
1448
1449 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1450 if (ret) {
1451 DRM_DEBUG_KMS("sideband msg failed to send\n");
1452 return ret;
1453 }
1454
1455 txmsg->cur_offset += tosend;
1456 if (txmsg->cur_offset == txmsg->cur_len) {
1457 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1458 return 1;
1459 }
1460 return 0;
1461}
1462
ad7f8a1f
DA		 1463static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1464{
1465 struct drm_dp_sideband_msg_tx *txmsg;
1466 int ret;
1467
cd961bb9
DV		 1468 WARN_ON(!mutex_is_locked(&mgr->qlock));
1469
ad7f8a1f
DA		 1470 /* construct a chunk from the first msg in the tx_msg queue */
1471 if (list_empty(&mgr->tx_msg_downq)) {
1472 mgr->tx_down_in_progress = false;
1473 return;
1474 }
1475 mgr->tx_down_in_progress = true;
1476
1477 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1478 ret = process_single_tx_qlock(mgr, txmsg, false);
1479 if (ret == 1) {
1480 /* txmsg is sent it should be in the slots now */
1481 list_del(&txmsg->next);
1482 } else if (ret) {
1483 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1484 list_del(&txmsg->next);
1485 if (txmsg->seqno != -1)
1486 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1487 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1488 wake_up(&mgr->tx_waitq);
1489 }
1490 if (list_empty(&mgr->tx_msg_downq)) {
1491 mgr->tx_down_in_progress = false;
1492 return;
1493 }
1494}
1495
1496/* called holding qlock */
1f16ee7f
ML		 1497static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1498 struct drm_dp_sideband_msg_tx *txmsg)
ad7f8a1f 1499{
ad7f8a1f
DA		 1500 int ret;
1501
1502 /* construct a chunk from the first msg in the tx_msg queue */
ad7f8a1f 1503 ret = process_single_tx_qlock(mgr, txmsg, true);
1f16ee7f
ML		 1504
1505 if (ret != 1)
ad7f8a1f 1506 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1f16ee7f
ML		 1507
1508 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
ad7f8a1f
DA		 1509}
1510
1511static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1512 struct drm_dp_sideband_msg_tx *txmsg)
1513{
1514 mutex_lock(&mgr->qlock);
1515 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1516 if (!mgr->tx_down_in_progress)
1517 process_single_down_tx_qlock(mgr);
1518 mutex_unlock(&mgr->qlock);
1519}
1520
68d8c9fc
DA		 1521static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1522 struct drm_dp_mst_branch *mstb)
ad7f8a1f
DA		 1523{
1524 int len;
1525 struct drm_dp_sideband_msg_tx *txmsg;
1526 int ret;
1527
1528 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1529 if (!txmsg)
68d8c9fc 1530 return;
ad7f8a1f
DA		 1531
1532 txmsg->dst = mstb;
1533 len = build_link_address(txmsg);
1534
68d8c9fc 1535 mstb->link_address_sent = true;
ad7f8a1f
DA		 1536 drm_dp_queue_down_tx(mgr, txmsg);
1537
1538 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1539 if (ret > 0) {
1540 int i;
1541
1542 if (txmsg->reply.reply_type == 1)
1543 DRM_DEBUG_KMS("link address nak received\n");
1544 else {
1545 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1546 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1547 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,
1548 txmsg->reply.u.link_addr.ports[i].input_port,
1549 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1550 txmsg->reply.u.link_addr.ports[i].port_number,
1551 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1552 txmsg->reply.u.link_addr.ports[i].mcs,
1553 txmsg->reply.u.link_addr.ports[i].ddps,
1554 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1555 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1556 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1557 }
1558 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1559 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1560 }
1561 (*mgr->cbs->hotplug)(mgr);
1562 }
68d8c9fc
DA		 1563 } else {
1564 mstb->link_address_sent = false;
ad7f8a1f 1565 DRM_DEBUG_KMS("link address failed %d\n", ret);
68d8c9fc 1566 }
ad7f8a1f
DA		 1567
1568 kfree(txmsg);
ad7f8a1f
DA		 1569}
1570
1571static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1572 struct drm_dp_mst_branch *mstb,
1573 struct drm_dp_mst_port *port)
1574{
1575 int len;
1576 struct drm_dp_sideband_msg_tx *txmsg;
1577 int ret;
1578
1579 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1580 if (!txmsg)
1581 return -ENOMEM;
1582
1583 txmsg->dst = mstb;
1584 len = build_enum_path_resources(txmsg, port->port_num);
1585
1586 drm_dp_queue_down_tx(mgr, txmsg);
1587
1588 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1589 if (ret > 0) {
1590 if (txmsg->reply.reply_type == 1)
1591 DRM_DEBUG_KMS("enum path resources nak received\n");
1592 else {
1593 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1594 DRM_ERROR("got incorrect port in response\n");
1595 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,
1596 txmsg->reply.u.path_resources.avail_payload_bw_number);
1597 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1598 }
1599 }
1600
1601 kfree(txmsg);
1602 return 0;
1603}
1604
8fa6a425
TR		 1605static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1606 struct drm_dp_mst_port *port,
1607 int id,
1608 int pbn)
ad7f8a1f
DA		 1609{
1610 struct drm_dp_sideband_msg_tx *txmsg;
1611 struct drm_dp_mst_branch *mstb;
1612 int len, ret;
ef8f9bea
LY		 1613 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1614 int i;
ad7f8a1f
DA		 1615
1616 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1617 if (!mstb)
1618 return -EINVAL;
1619
1620 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1621 if (!txmsg) {
1622 ret = -ENOMEM;
1623 goto fail_put;
1624 }
1625
ef8f9bea
LY		 1626 for (i = 0; i < port->num_sdp_streams; i++)
1627 sinks[i] = i;
1628
ad7f8a1f
DA		 1629 txmsg->dst = mstb;
1630 len = build_allocate_payload(txmsg, port->port_num,
1631 id,
ef8f9bea 1632 pbn, port->num_sdp_streams, sinks);
ad7f8a1f
DA		 1633
1634 drm_dp_queue_down_tx(mgr, txmsg);
1635
1636 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1637 if (ret > 0) {
1638 if (txmsg->reply.reply_type == 1) {
1639 ret = -EINVAL;
1640 } else
1641 ret = 0;
1642 }
1643 kfree(txmsg);
1644fail_put:
1645 drm_dp_put_mst_branch_device(mstb);
1646 return ret;
1647}
1648
1649static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1650 int id,
1651 struct drm_dp_payload *payload)
1652{
1653 int ret;
1654
1655 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1656 if (ret < 0) {
1657 payload->payload_state = 0;
1658 return ret;
1659 }
1660 payload->payload_state = DP_PAYLOAD_LOCAL;
1661 return 0;
1662}
1663
8fa6a425
TR		 1664static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1665 struct drm_dp_mst_port *port,
1666 int id,
1667 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1668{
1669 int ret;
1670 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1671 if (ret < 0)
1672 return ret;
1673 payload->payload_state = DP_PAYLOAD_REMOTE;
1674 return ret;
1675}
1676
8fa6a425
TR		 1677static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1678 struct drm_dp_mst_port *port,
1679 int id,
1680 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1681{
1682 DRM_DEBUG_KMS("\n");
1683 /* its okay for these to fail */
1684 if (port) {
1685 drm_dp_payload_send_msg(mgr, port, id, 0);
1686 }
1687
1688 drm_dp_dpcd_write_payload(mgr, id, payload);
dfda0df3 1689 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
ad7f8a1f
DA		 1690 return 0;
1691}
1692
8fa6a425
TR		 1693static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1694 int id,
1695 struct drm_dp_payload *payload)
ad7f8a1f
DA		 1696{
1697 payload->payload_state = 0;
1698 return 0;
1699}
1700
1701/**
1702 * drm_dp_update_payload_part1() - Execute payload update part 1
1703 * @mgr: manager to use.
1704 *
1705 * This iterates over all proposed virtual channels, and tries to
1706 * allocate space in the link for them. For 0->slots transitions,
1707 * this step just writes the VCPI to the MST device. For slots->0
1708 * transitions, this writes the updated VCPIs and removes the
1709 * remote VC payloads.
1710 *
1711 * after calling this the driver should generate ACT and payload
1712 * packets.
1713 */
1714int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1715{
dfda0df3 1716 int i, j;
ad7f8a1f
DA		 1717 int cur_slots = 1;
1718 struct drm_dp_payload req_payload;
1719 struct drm_dp_mst_port *port;
1720
1721 mutex_lock(&mgr->payload_lock);
1722 for (i = 0; i < mgr->max_payloads; i++) {
1723 /* solve the current payloads - compare to the hw ones
1724 - update the hw view */
1725 req_payload.start_slot = cur_slots;
1726 if (mgr->proposed_vcpis[i]) {
1727 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1728 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
6cecdf7a 1729 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
ad7f8a1f
DA		 1730 } else {
1731 port = NULL;
1732 req_payload.num_slots = 0;
1733 }
dfda0df3
DA		 1734
1735 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1736 mgr->payloads[i].start_slot = req_payload.start_slot;
1737 }
ad7f8a1f 1738 /* work out what is required to happen with this payload */
dfda0df3 1739 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
ad7f8a1f
DA		 1740
1741 /* need to push an update for this payload */
1742 if (req_payload.num_slots) {
dfda0df3 1743 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
ad7f8a1f 1744 mgr->payloads[i].num_slots = req_payload.num_slots;
6cecdf7a 1745 mgr->payloads[i].vcpi = req_payload.vcpi;
ad7f8a1f
DA		 1746 } else if (mgr->payloads[i].num_slots) {
1747 mgr->payloads[i].num_slots = 0;
dfda0df3 1748 drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]);
ad7f8a1f 1749 req_payload.payload_state = mgr->payloads[i].payload_state;
dfda0df3
DA		 1750 mgr->payloads[i].start_slot = 0;
1751 }
ad7f8a1f
DA		 1752 mgr->payloads[i].payload_state = req_payload.payload_state;
1753 }
1754 cur_slots += req_payload.num_slots;
1755 }
dfda0df3
DA		 1756
1757 for (i = 0; i < mgr->max_payloads; i++) {
1758 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1759 DRM_DEBUG_KMS("removing payload %d\n", i);
1760 for (j = i; j < mgr->max_payloads - 1; j++) {
1761 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1762 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1763 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1764 set_bit(j + 1, &mgr->payload_mask);
1765 } else {
1766 clear_bit(j + 1, &mgr->payload_mask);
1767 }
1768 }
1769 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1770 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1771 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1772
1773 }
1774 }
ad7f8a1f
DA		 1775 mutex_unlock(&mgr->payload_lock);
1776
1777 return 0;
1778}
1779EXPORT_SYMBOL(drm_dp_update_payload_part1);
1780
1781/**
1782 * drm_dp_update_payload_part2() - Execute payload update part 2
1783 * @mgr: manager to use.
1784 *
1785 * This iterates over all proposed virtual channels, and tries to
1786 * allocate space in the link for them. For 0->slots transitions,
1787 * this step writes the remote VC payload commands. For slots->0
1788 * this just resets some internal state.
1789 */
1790int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1791{
1792 struct drm_dp_mst_port *port;
1793 int i;
7389ad4b 1794 int ret = 0;
ad7f8a1f
DA		 1795 mutex_lock(&mgr->payload_lock);
1796 for (i = 0; i < mgr->max_payloads; i++) {
1797
1798 if (!mgr->proposed_vcpis[i])
1799 continue;
1800
1801 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1802
1803 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1804 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
dfda0df3 1805 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
ad7f8a1f 1806 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
dfda0df3 1807 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
ad7f8a1f
DA		 1808 }
1809 if (ret) {
1810 mutex_unlock(&mgr->payload_lock);
1811 return ret;
1812 }
1813 }
1814 mutex_unlock(&mgr->payload_lock);
1815 return 0;
1816}
1817EXPORT_SYMBOL(drm_dp_update_payload_part2);
1818
1819#if 0 /* unused as of yet */
1820static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1821 struct drm_dp_mst_port *port,
1822 int offset, int size)
1823{
1824 int len;
1825 struct drm_dp_sideband_msg_tx *txmsg;
1826
1827 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1828 if (!txmsg)
1829 return -ENOMEM;
1830
1831 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1832 txmsg->dst = port->parent;
1833
1834 drm_dp_queue_down_tx(mgr, txmsg);
1835
1836 return 0;
1837}
1838#endif
1839
1840static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1841 struct drm_dp_mst_port *port,
1842 int offset, int size, u8 *bytes)
1843{
1844 int len;
1845 int ret;
1846 struct drm_dp_sideband_msg_tx *txmsg;
1847 struct drm_dp_mst_branch *mstb;
1848
1849 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1850 if (!mstb)
1851 return -EINVAL;
1852
1853 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1854 if (!txmsg) {
1855 ret = -ENOMEM;
1856 goto fail_put;
1857 }
1858
1859 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1860 txmsg->dst = mstb;
1861
1862 drm_dp_queue_down_tx(mgr, txmsg);
1863
1864 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1865 if (ret > 0) {
1866 if (txmsg->reply.reply_type == 1) {
1867 ret = -EINVAL;
1868 } else
1869 ret = 0;
1870 }
1871 kfree(txmsg);
1872fail_put:
1873 drm_dp_put_mst_branch_device(mstb);
1874 return ret;
1875}
1876
1877static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1878{
1879 struct drm_dp_sideband_msg_reply_body reply;
1880
a68d2437 1881 reply.reply_type = 0;
ad7f8a1f
DA		 1882 reply.req_type = req_type;
1883 drm_dp_encode_sideband_reply(&reply, msg);
1884 return 0;
1885}
1886
1887static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1888 struct drm_dp_mst_branch *mstb,
1889 int req_type, int seqno, bool broadcast)
1890{
1891 struct drm_dp_sideband_msg_tx *txmsg;
1892
1893 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1894 if (!txmsg)
1895 return -ENOMEM;
1896
1897 txmsg->dst = mstb;
1898 txmsg->seqno = seqno;
1899 drm_dp_encode_up_ack_reply(txmsg, req_type);
1900
1901 mutex_lock(&mgr->qlock);
1f16ee7f
ML		 1902
1903 process_single_up_tx_qlock(mgr, txmsg);
1904
ad7f8a1f 1905 mutex_unlock(&mgr->qlock);
1f16ee7f
ML		 1906
1907 kfree(txmsg);
ad7f8a1f
DA		 1908 return 0;
1909}
1910
b853fdb3
CW		 1911static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
1912 int dp_link_count,
1913 int *out)
ad7f8a1f
DA		 1914{
1915 switch (dp_link_bw) {
b853fdb3
CW		 1916 default:
1917 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1918 dp_link_bw, dp_link_count);
1919 return false;
1920
ad7f8a1f 1921 case DP_LINK_BW_1_62:
b853fdb3
CW		 1922 *out = 3 * dp_link_count;
1923 break;
ad7f8a1f 1924 case DP_LINK_BW_2_7:
b853fdb3
CW		 1925 *out = 5 * dp_link_count;
1926 break;
ad7f8a1f 1927 case DP_LINK_BW_5_4:
b853fdb3
CW		 1928 *out = 10 * dp_link_count;
1929 break;
ad7f8a1f 1930 }
b853fdb3 1931 return true;
ad7f8a1f
DA		 1932}
1933
1934/**
1935 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
1936 * @mgr: manager to set state for
1937 * @mst_state: true to enable MST on this connector - false to disable.
1938 *
1939 * This is called by the driver when it detects an MST capable device plugged
1940 * into a DP MST capable port, or when a DP MST capable device is unplugged.
1941 */
1942int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
1943{
1944 int ret = 0;
1945 struct drm_dp_mst_branch *mstb = NULL;
1946
1947 mutex_lock(&mgr->lock);
1948 if (mst_state == mgr->mst_state)
1949 goto out_unlock;
1950
1951 mgr->mst_state = mst_state;
1952 /* set the device into MST mode */
1953 if (mst_state) {
1954 WARN_ON(mgr->mst_primary);
1955
1956 /* get dpcd info */
1957 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
1958 if (ret != DP_RECEIVER_CAP_SIZE) {
1959 DRM_DEBUG_KMS("failed to read DPCD\n");
1960 goto out_unlock;
1961 }
1962
b853fdb3
CW		 1963 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
1964 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
1965 &mgr->pbn_div)) {
1966 ret = -EINVAL;
1967 goto out_unlock;
1968 }
1969
ad7f8a1f
DA		 1970 mgr->total_pbn = 2560;
1971 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div);
1972 mgr->avail_slots = mgr->total_slots;
1973
1974 /* add initial branch device at LCT 1 */
1975 mstb = drm_dp_add_mst_branch_device(1, NULL);
1976 if (mstb == NULL) {
1977 ret = -ENOMEM;
1978 goto out_unlock;
1979 }
1980 mstb->mgr = mgr;
1981
1982 /* give this the main reference */
1983 mgr->mst_primary = mstb;
1984 kref_get(&mgr->mst_primary->kref);
1985
1986 {
1987 struct drm_dp_payload reset_pay;
1988 reset_pay.start_slot = 0;
1989 reset_pay.num_slots = 0x3f;
1990 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
1991 }
1992
1993 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
1994 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
1995 if (ret < 0) {
1996 goto out_unlock;
1997 }
1998
1999
2000 /* sort out guid */
2001 ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16);
2002 if (ret != 16) {
2003 DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret);
2004 goto out_unlock;
2005 }
2006
2007 mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid);
2008 if (!mgr->guid_valid) {
2009 ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16);
2010 mgr->guid_valid = true;
2011 }
2012
2013 queue_work(system_long_wq, &mgr->work);
2014
2015 ret = 0;
2016 } else {
2017 /* disable MST on the device */
2018 mstb = mgr->mst_primary;
2019 mgr->mst_primary = NULL;
2020 /* this can fail if the device is gone */
2021 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2022 ret = 0;
2023 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2024 mgr->payload_mask = 0;
2025 set_bit(0, &mgr->payload_mask);
dfda0df3 2026 mgr->vcpi_mask = 0;
ad7f8a1f
DA		 2027 }
2028
2029out_unlock:
2030 mutex_unlock(&mgr->lock);
2031 if (mstb)
2032 drm_dp_put_mst_branch_device(mstb);
2033 return ret;
2034
2035}
2036EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2037
2038/**
2039 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2040 * @mgr: manager to suspend
2041 *
2042 * This function tells the MST device that we can't handle UP messages
2043 * anymore. This should stop it from sending any since we are suspended.
2044 */
2045void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2046{
2047 mutex_lock(&mgr->lock);
2048 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2049 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2050 mutex_unlock(&mgr->lock);
274d8352
DA		 2051 flush_work(&mgr->work);
2052 flush_work(&mgr->destroy_connector_work);
ad7f8a1f
DA		 2053}
2054EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2055
2056/**
2057 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2058 * @mgr: manager to resume
2059 *
2060 * This will fetch DPCD and see if the device is still there,
2061 * if it is, it will rewrite the MSTM control bits, and return.
2062 *
2063 * if the device fails this returns -1, and the driver should do
2064 * a full MST reprobe, in case we were undocked.
2065 */
2066int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2067{
2068 int ret = 0;
2069
2070 mutex_lock(&mgr->lock);
2071
2072 if (mgr->mst_primary) {
2073 int sret;
2074 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2075 if (sret != DP_RECEIVER_CAP_SIZE) {
2076 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2077 ret = -1;
2078 goto out_unlock;
2079 }
2080
2081 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2082 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2083 if (ret < 0) {
2084 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2085 ret = -1;
2086 goto out_unlock;
2087 }
2088 ret = 0;
2089 } else
2090 ret = -1;
2091
2092out_unlock:
2093 mutex_unlock(&mgr->lock);
2094 return ret;
2095}
2096EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2097
2098static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2099{
2100 int len;
2101 u8 replyblock[32];
2102 int replylen, origlen, curreply;
2103 int ret;
2104 struct drm_dp_sideband_msg_rx *msg;
2105 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2106 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2107
2108 len = min(mgr->max_dpcd_transaction_bytes, 16);
2109 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2110 replyblock, len);
2111 if (ret != len) {
2112 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2113 return;
2114 }
2115 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2116 if (!ret) {
2117 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2118 return;
2119 }
2120 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2121
2122 origlen = replylen;
2123 replylen -= len;
2124 curreply = len;
2125 while (replylen > 0) {
2126 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2127 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2128 replyblock, len);
2129 if (ret != len) {
2130 DRM_DEBUG_KMS("failed to read a chunk\n");
2131 }
2132 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2133 if (ret == false)
2134 DRM_DEBUG_KMS("failed to build sideband msg\n");
2135 curreply += len;
2136 replylen -= len;
2137 }
2138}
2139
2140static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2141{
2142 int ret = 0;
2143
2144 drm_dp_get_one_sb_msg(mgr, false);
2145
2146 if (mgr->down_rep_recv.have_eomt) {
2147 struct drm_dp_sideband_msg_tx *txmsg;
2148 struct drm_dp_mst_branch *mstb;
2149 int slot = -1;
2150 mstb = drm_dp_get_mst_branch_device(mgr,
2151 mgr->down_rep_recv.initial_hdr.lct,
2152 mgr->down_rep_recv.initial_hdr.rad);
2153
2154 if (!mstb) {
2155 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2156 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2157 return 0;
2158 }
2159
2160 /* find the message */
2161 slot = mgr->down_rep_recv.initial_hdr.seqno;
2162 mutex_lock(&mgr->qlock);
2163 txmsg = mstb->tx_slots[slot];
2164 /* remove from slots */
2165 mutex_unlock(&mgr->qlock);
2166
2167 if (!txmsg) {
2168 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2169 mstb,
2170 mgr->down_rep_recv.initial_hdr.seqno,
2171 mgr->down_rep_recv.initial_hdr.lct,
2172 mgr->down_rep_recv.initial_hdr.rad[0],
2173 mgr->down_rep_recv.msg[0]);
2174 drm_dp_put_mst_branch_device(mstb);
2175 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2176 return 0;
2177 }
2178
2179 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2180 if (txmsg->reply.reply_type == 1) {
2181 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);
2182 }
2183
2184 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2185 drm_dp_put_mst_branch_device(mstb);
2186
2187 mutex_lock(&mgr->qlock);
2188 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2189 mstb->tx_slots[slot] = NULL;
2190 mutex_unlock(&mgr->qlock);
2191
2192 wake_up(&mgr->tx_waitq);
2193 }
2194 return ret;
2195}
2196
2197static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2198{
2199 int ret = 0;
2200 drm_dp_get_one_sb_msg(mgr, true);
2201
2202 if (mgr->up_req_recv.have_eomt) {
2203 struct drm_dp_sideband_msg_req_body msg;
bd934320 2204 struct drm_dp_mst_branch *mstb = NULL;
ad7f8a1f 2205 bool seqno;
bd934320
ML		 2206
2207 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2208 mstb = drm_dp_get_mst_branch_device(mgr,
2209 mgr->up_req_recv.initial_hdr.lct,
2210 mgr->up_req_recv.initial_hdr.rad);
2211 if (!mstb) {
2212 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2213 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2214 return 0;
2215 }
ad7f8a1f
DA		 2216 }
2217
2218 seqno = mgr->up_req_recv.initial_hdr.seqno;
2219 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2220
2221 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
bd934320
ML		 2222 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2223
2224 if (!mstb)
2225 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2226
2227 if (!mstb) {
2228 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2229 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2230 return 0;
2231 }
2232
ad7f8a1f
DA		 2233 drm_dp_update_port(mstb, &msg.u.conn_stat);
2234 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);
2235 (*mgr->cbs->hotplug)(mgr);
2236
2237 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
bd934320
ML		 2238 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2239 if (!mstb)
2240 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2241
2242 if (!mstb) {
2243 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2244 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2245 return 0;
2246 }
2247
ad7f8a1f
DA		 2248 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2249 }
2250
2251 drm_dp_put_mst_branch_device(mstb);
2252 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2253 }
2254 return ret;
2255}
2256
2257/**
2258 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2259 * @mgr: manager to notify irq for.
2260 * @esi: 4 bytes from SINK_COUNT_ESI
295ee853 2261 * @handled: whether the hpd interrupt was consumed or not
ad7f8a1f
DA		 2262 *
2263 * This should be called from the driver when it detects a short IRQ,
2264 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2265 * topology manager will process the sideband messages received as a result
2266 * of this.
2267 */
2268int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2269{
2270 int ret = 0;
2271 int sc;
2272 *handled = false;
2273 sc = esi[0] & 0x3f;
2274
2275 if (sc != mgr->sink_count) {
2276 mgr->sink_count = sc;
2277 *handled = true;
2278 }
2279
2280 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2281 ret = drm_dp_mst_handle_down_rep(mgr);
2282 *handled = true;
2283 }
2284
2285 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2286 ret |= drm_dp_mst_handle_up_req(mgr);
2287 *handled = true;
2288 }
2289
2290 drm_dp_mst_kick_tx(mgr);
2291 return ret;
2292}
2293EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2294
2295/**
2296 * drm_dp_mst_detect_port() - get connection status for an MST port
2297 * @mgr: manager for this port
2298 * @port: unverified pointer to a port
2299 *
2300 * This returns the current connection state for a port. It validates the
2301 * port pointer still exists so the caller doesn't require a reference
2302 */
c6a0aed4
DA		 2303enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2304 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
ad7f8a1f
DA		 2305{
2306 enum drm_connector_status status = connector_status_disconnected;
2307
2308 /* we need to search for the port in the mgr in case its gone */
2309 port = drm_dp_get_validated_port_ref(mgr, port);
2310 if (!port)
2311 return connector_status_disconnected;
2312
2313 if (!port->ddps)
2314 goto out;
2315
2316 switch (port->pdt) {
2317 case DP_PEER_DEVICE_NONE:
2318 case DP_PEER_DEVICE_MST_BRANCHING:
2319 break;
2320
2321 case DP_PEER_DEVICE_SST_SINK:
2322 status = connector_status_connected;
c6a0aed4
DA		 2323 /* for logical ports - cache the EDID */
2324 if (port->port_num >= 8 && !port->cached_edid) {
2325 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2326 }
ad7f8a1f
DA		 2327 break;
2328 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2329 if (port->ldps)
2330 status = connector_status_connected;
2331 break;
2332 }
2333out:
2334 drm_dp_put_port(port);
2335 return status;
2336}
2337EXPORT_SYMBOL(drm_dp_mst_detect_port);
2338
ef8f9bea
LY		 2339/**
2340 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2341 * @mgr: manager for this port
2342 * @port: unverified pointer to a port.
2343 *
2344 * This returns whether the port supports audio or not.
2345 */
2346bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2347 struct drm_dp_mst_port *port)
2348{
2349 bool ret = false;
2350
2351 port = drm_dp_get_validated_port_ref(mgr, port);
2352 if (!port)
2353 return ret;
2354 ret = port->has_audio;
2355 drm_dp_put_port(port);
2356 return ret;
2357}
2358EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2359
ad7f8a1f
DA		 2360/**
2361 * drm_dp_mst_get_edid() - get EDID for an MST port
2362 * @connector: toplevel connector to get EDID for
2363 * @mgr: manager for this port
2364 * @port: unverified pointer to a port.
2365 *
2366 * This returns an EDID for the port connected to a connector,
2367 * It validates the pointer still exists so the caller doesn't require a
2368 * reference.
2369 */
2370struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2371{
2372 struct edid *edid = NULL;
2373
2374 /* we need to search for the port in the mgr in case its gone */
2375 port = drm_dp_get_validated_port_ref(mgr, port);
2376 if (!port)
2377 return NULL;
2378
c6a0aed4
DA		 2379 if (port->cached_edid)
2380 edid = drm_edid_duplicate(port->cached_edid);
d9515c5e 2381 else {
c6a0aed4 2382 edid = drm_get_edid(connector, &port->aux.ddc);
d9515c5e
DA		 2383 drm_mode_connector_set_tile_property(connector);
2384 }
ef8f9bea 2385 port->has_audio = drm_detect_monitor_audio(edid);
ad7f8a1f
DA		 2386 drm_dp_put_port(port);
2387 return edid;
2388}
2389EXPORT_SYMBOL(drm_dp_mst_get_edid);
2390
2391/**
2392 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2393 * @mgr: manager to use
2394 * @pbn: payload bandwidth to convert into slots.
2395 */
2396int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2397 int pbn)
2398{
2399 int num_slots;
2400
2401 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2402
2403 if (num_slots > mgr->avail_slots)
2404 return -ENOSPC;
2405 return num_slots;
2406}
2407EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2408
2409static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2410 struct drm_dp_vcpi *vcpi, int pbn)
2411{
2412 int num_slots;
2413 int ret;
2414
2415 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2416
2417 if (num_slots > mgr->avail_slots)
2418 return -ENOSPC;
2419
2420 vcpi->pbn = pbn;
2421 vcpi->aligned_pbn = num_slots * mgr->pbn_div;
2422 vcpi->num_slots = num_slots;
2423
2424 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2425 if (ret < 0)
2426 return ret;
2427 return 0;
2428}
2429
2430/**
2431 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2432 * @mgr: manager for this port
2433 * @port: port to allocate a virtual channel for.
2434 * @pbn: payload bandwidth number to request
2435 * @slots: returned number of slots for this PBN.
2436 */
2437bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots)
2438{
2439 int ret;
2440
2441 port = drm_dp_get_validated_port_ref(mgr, port);
2442 if (!port)
2443 return false;
2444
2445 if (port->vcpi.vcpi > 0) {
2446 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2447 if (pbn == port->vcpi.pbn) {
2448 *slots = port->vcpi.num_slots;
2449 return true;
2450 }
2451 }
2452
2453 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn);
2454 if (ret) {
2455 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret);
2456 goto out;
2457 }
2458 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots);
2459 *slots = port->vcpi.num_slots;
2460
2461 drm_dp_put_port(port);
2462 return true;
2463out:
2464 return false;
2465}
2466EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2467
87f5942d
DA		 2468int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2469{
2470 int slots = 0;
2471 port = drm_dp_get_validated_port_ref(mgr, port);
2472 if (!port)
2473 return slots;
2474
2475 slots = port->vcpi.num_slots;
2476 drm_dp_put_port(port);
2477 return slots;
2478}
2479EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2480
ad7f8a1f
DA		 2481/**
2482 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2483 * @mgr: manager for this port
2484 * @port: unverified pointer to a port.
2485 *
2486 * This just resets the number of slots for the ports VCPI for later programming.
2487 */
2488void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2489{
2490 port = drm_dp_get_validated_port_ref(mgr, port);
2491 if (!port)
2492 return;
2493 port->vcpi.num_slots = 0;
2494 drm_dp_put_port(port);
2495}
2496EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2497
2498/**
2499 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2500 * @mgr: manager for this port
2501 * @port: unverified port to deallocate vcpi for
2502 */
2503void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2504{
2505 port = drm_dp_get_validated_port_ref(mgr, port);
2506 if (!port)
2507 return;
2508
2509 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2510 port->vcpi.num_slots = 0;
2511 port->vcpi.pbn = 0;
2512 port->vcpi.aligned_pbn = 0;
2513 port->vcpi.vcpi = 0;
2514 drm_dp_put_port(port);
2515}
2516EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2517
2518static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2519 int id, struct drm_dp_payload *payload)
2520{
2521 u8 payload_alloc[3], status;
2522 int ret;
2523 int retries = 0;
2524
2525 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2526 DP_PAYLOAD_TABLE_UPDATED);
2527
2528 payload_alloc[0] = id;
2529 payload_alloc[1] = payload->start_slot;
2530 payload_alloc[2] = payload->num_slots;
2531
2532 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2533 if (ret != 3) {
2534 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2535 goto fail;
2536 }
2537
2538retry:
2539 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2540 if (ret < 0) {
2541 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2542 goto fail;
2543 }
2544
2545 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2546 retries++;
2547 if (retries < 20) {
2548 usleep_range(10000, 20000);
2549 goto retry;
2550 }
2551 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2552 ret = -EINVAL;
2553 goto fail;
2554 }
2555 ret = 0;
2556fail:
2557 return ret;
2558}
2559
2560
2561/**
2562 * drm_dp_check_act_status() - Check ACT handled status.
2563 * @mgr: manager to use
2564 *
2565 * Check the payload status bits in the DPCD for ACT handled completion.
2566 */
2567int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2568{
2569 u8 status;
2570 int ret;
2571 int count = 0;
2572
2573 do {
2574 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2575
2576 if (ret < 0) {
2577 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2578 goto fail;
2579 }
2580
2581 if (status & DP_PAYLOAD_ACT_HANDLED)
2582 break;
2583 count++;
2584 udelay(100);
2585
2586 } while (count < 30);
2587
2588 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2589 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2590 ret = -EINVAL;
2591 goto fail;
2592 }
2593 return 0;
2594fail:
2595 return ret;
2596}
2597EXPORT_SYMBOL(drm_dp_check_act_status);
2598
2599/**
2600 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2601 * @clock: dot clock for the mode
2602 * @bpp: bpp for the mode.
2603 *
2604 * This uses the formula in the spec to calculate the PBN value for a mode.
2605 */
2606int drm_dp_calc_pbn_mode(int clock, int bpp)
2607{
2608 fixed20_12 pix_bw;
2609 fixed20_12 fbpp;
2610 fixed20_12 result;
2611 fixed20_12 margin, tmp;
2612 u32 res;
2613
2614 pix_bw.full = dfixed_const(clock);
2615 fbpp.full = dfixed_const(bpp);
2616 tmp.full = dfixed_const(8);
2617 fbpp.full = dfixed_div(fbpp, tmp);
2618
2619 result.full = dfixed_mul(pix_bw, fbpp);
2620 margin.full = dfixed_const(54);
2621 tmp.full = dfixed_const(64);
2622 margin.full = dfixed_div(margin, tmp);
2623 result.full = dfixed_div(result, margin);
2624
2625 margin.full = dfixed_const(1006);
2626 tmp.full = dfixed_const(1000);
2627 margin.full = dfixed_div(margin, tmp);
2628 result.full = dfixed_mul(result, margin);
2629
2630 result.full = dfixed_div(result, tmp);
2631 result.full = dfixed_ceil(result);
2632 res = dfixed_trunc(result);
2633 return res;
2634}
2635EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2636
2637static int test_calc_pbn_mode(void)
2638{
2639 int ret;
2640 ret = drm_dp_calc_pbn_mode(154000, 30);
2641 if (ret != 689)
2642 return -EINVAL;
2643 ret = drm_dp_calc_pbn_mode(234000, 30);
2644 if (ret != 1047)
2645 return -EINVAL;
2646 return 0;
2647}
2648
2649/* we want to kick the TX after we've ack the up/down IRQs. */
2650static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2651{
2652 queue_work(system_long_wq, &mgr->tx_work);
2653}
2654
2655static void drm_dp_mst_dump_mstb(struct seq_file *m,
2656 struct drm_dp_mst_branch *mstb)
2657{
2658 struct drm_dp_mst_port *port;
2659 int tabs = mstb->lct;
2660 char prefix[10];
2661 int i;
2662
2663 for (i = 0; i < tabs; i++)
2664 prefix[i] = '\t';
2665 prefix[i] = '\0';
2666
2667 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2668 list_for_each_entry(port, &mstb->ports, next) {
ef8f9bea 2669 seq_printf(m, "%sport: %d: ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
ad7f8a1f
DA		 2670 if (port->mstb)
2671 drm_dp_mst_dump_mstb(m, port->mstb);
2672 }
2673}
2674
2675static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2676 char *buf)
2677{
2678 int ret;
2679 int i;
2680 for (i = 0; i < 4; i++) {
2681 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
2682 if (ret != 16)
2683 break;
2684 }
2685 if (i == 4)
2686 return true;
2687 return false;
2688}
2689
2690/**
2691 * drm_dp_mst_dump_topology(): dump topology to seq file.
2692 * @m: seq_file to dump output to
2693 * @mgr: manager to dump current topology for.
2694 *
2695 * helper to dump MST topology to a seq file for debugfs.
2696 */
2697void drm_dp_mst_dump_topology(struct seq_file *m,
2698 struct drm_dp_mst_topology_mgr *mgr)
2699{
2700 int i;
2701 struct drm_dp_mst_port *port;
2702 mutex_lock(&mgr->lock);
2703 if (mgr->mst_primary)
2704 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2705
2706 /* dump VCPIs */
2707 mutex_unlock(&mgr->lock);
2708
2709 mutex_lock(&mgr->payload_lock);
dfda0df3 2710 seq_printf(m, "vcpi: %lx %lx\n", mgr->payload_mask, mgr->vcpi_mask);
ad7f8a1f
DA		 2711
2712 for (i = 0; i < mgr->max_payloads; i++) {
2713 if (mgr->proposed_vcpis[i]) {
2714 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2715 seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots);
2716 } else
2717 seq_printf(m, "vcpi %d:unsed\n", i);
2718 }
2719 for (i = 0; i < mgr->max_payloads; i++) {
2720 seq_printf(m, "payload %d: %d, %d, %d\n",
2721 i,
2722 mgr->payloads[i].payload_state,
2723 mgr->payloads[i].start_slot,
2724 mgr->payloads[i].num_slots);
2725
2726
2727 }
2728 mutex_unlock(&mgr->payload_lock);
2729
2730 mutex_lock(&mgr->lock);
2731 if (mgr->mst_primary) {
2732 u8 buf[64];
2733 bool bret;
2734 int ret;
2735 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2736 seq_printf(m, "dpcd: ");
2737 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
2738 seq_printf(m, "%02x ", buf[i]);
2739 seq_printf(m, "\n");
2740 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2741 seq_printf(m, "faux/mst: ");
2742 for (i = 0; i < 2; i++)
2743 seq_printf(m, "%02x ", buf[i]);
2744 seq_printf(m, "\n");
2745 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2746 seq_printf(m, "mst ctrl: ");
2747 for (i = 0; i < 1; i++)
2748 seq_printf(m, "%02x ", buf[i]);
2749 seq_printf(m, "\n");
2750
44790462
DA		 2751 /* dump the standard OUI branch header */
2752 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2753 seq_printf(m, "branch oui: ");
2754 for (i = 0; i < 0x3; i++)
2755 seq_printf(m, "%02x", buf[i]);
2756 seq_printf(m, " devid: ");
2757 for (i = 0x3; i < 0x8; i++)
2758 seq_printf(m, "%c", buf[i]);
2759 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2760 seq_printf(m, "\n");
ad7f8a1f
DA		 2761 bret = dump_dp_payload_table(mgr, buf);
2762 if (bret == true) {
2763 seq_printf(m, "payload table: ");
2764 for (i = 0; i < 63; i++)
2765 seq_printf(m, "%02x ", buf[i]);
2766 seq_printf(m, "\n");
2767 }
2768
2769 }
2770
2771 mutex_unlock(&mgr->lock);
2772
2773}
2774EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2775
2776static void drm_dp_tx_work(struct work_struct *work)
2777{
2778 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2779
2780 mutex_lock(&mgr->qlock);
2781 if (mgr->tx_down_in_progress)
2782 process_single_down_tx_qlock(mgr);
2783 mutex_unlock(&mgr->qlock);
2784}
2785
6b8eeca6
DA		 2786static void drm_dp_destroy_connector_work(struct work_struct *work)
2787{
2788 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
4772ff03 2789 struct drm_dp_mst_port *port;
df4839fd 2790 bool send_hotplug = false;
6b8eeca6
DA		 2791 /*
2792 * Not a regular list traverse as we have to drop the destroy
2793 * connector lock before destroying the connector, to avoid AB->BA
2794 * ordering between this lock and the config mutex.
2795 */
2796 for (;;) {
2797 mutex_lock(&mgr->destroy_connector_lock);
4772ff03
ML		 2798 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2799 if (!port) {
6b8eeca6
DA		 2800 mutex_unlock(&mgr->destroy_connector_lock);
2801 break;
2802 }
4772ff03 2803 list_del(&port->next);
6b8eeca6
DA		 2804 mutex_unlock(&mgr->destroy_connector_lock);
2805
4772ff03
ML		 2806 mgr->cbs->destroy_connector(mgr, port->connector);
2807
2808 drm_dp_port_teardown_pdt(port, port->pdt);
2809
2810 if (!port->input && port->vcpi.vcpi > 0)
2811 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2812 kfree(port);
df4839fd 2813 send_hotplug = true;
6b8eeca6 2814 }
df4839fd
DA		 2815 if (send_hotplug)
2816 (*mgr->cbs->hotplug)(mgr);
6b8eeca6
DA		 2817}
2818
ad7f8a1f
DA		 2819/**
2820 * drm_dp_mst_topology_mgr_init - initialise a topology manager
2821 * @mgr: manager struct to initialise
2822 * @dev: device providing this structure - for i2c addition.
2823 * @aux: DP helper aux channel to talk to this device
2824 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
2825 * @max_payloads: maximum number of payloads this GPU can source
2826 * @conn_base_id: the connector object ID the MST device is connected to.
2827 *
2828 * Return 0 for success, or negative error code on failure
2829 */
2830int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
2831 struct device *dev, struct drm_dp_aux *aux,
2832 int max_dpcd_transaction_bytes,
2833 int max_payloads, int conn_base_id)
2834{
2835 mutex_init(&mgr->lock);
2836 mutex_init(&mgr->qlock);
2837 mutex_init(&mgr->payload_lock);
6b8eeca6 2838 mutex_init(&mgr->destroy_connector_lock);
ad7f8a1f 2839 INIT_LIST_HEAD(&mgr->tx_msg_downq);
6b8eeca6 2840 INIT_LIST_HEAD(&mgr->destroy_connector_list);
ad7f8a1f
DA		 2841 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
2842 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
6b8eeca6 2843 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
ad7f8a1f
DA		 2844 init_waitqueue_head(&mgr->tx_waitq);
2845 mgr->dev = dev;
2846 mgr->aux = aux;
2847 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
2848 mgr->max_payloads = max_payloads;
2849 mgr->conn_base_id = conn_base_id;
2850 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
2851 if (!mgr->payloads)
2852 return -ENOMEM;
2853 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
2854 if (!mgr->proposed_vcpis)
2855 return -ENOMEM;
2856 set_bit(0, &mgr->payload_mask);
2857 test_calc_pbn_mode();
2858 return 0;
2859}
2860EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
2861
2862/**
2863 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
2864 * @mgr: manager to destroy
2865 */
2866void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
2867{
274d8352 2868 flush_work(&mgr->work);
6b8eeca6 2869 flush_work(&mgr->destroy_connector_work);
ad7f8a1f
DA		 2870 mutex_lock(&mgr->payload_lock);
2871 kfree(mgr->payloads);
2872 mgr->payloads = NULL;
2873 kfree(mgr->proposed_vcpis);
2874 mgr->proposed_vcpis = NULL;
2875 mutex_unlock(&mgr->payload_lock);
2876 mgr->dev = NULL;
2877 mgr->aux = NULL;
2878}
2879EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
2880
2881/* I2C device */
2882static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
2883 int num)
2884{
2885 struct drm_dp_aux *aux = adapter->algo_data;
2886 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
2887 struct drm_dp_mst_branch *mstb;
2888 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
2889 unsigned int i;
2890 bool reading = false;
2891 struct drm_dp_sideband_msg_req_body msg;
2892 struct drm_dp_sideband_msg_tx *txmsg = NULL;
2893 int ret;
2894
2895 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
2896 if (!mstb)
2897 return -EREMOTEIO;
2898
2899 /* construct i2c msg */
2900 /* see if last msg is a read */
2901 if (msgs[num - 1].flags & I2C_M_RD)
2902 reading = true;
2903
ae491542 2904 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
ad7f8a1f
DA		 2905 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
2906 ret = -EIO;
2907 goto out;
2908 }
2909
ae491542 2910 memset(&msg, 0, sizeof(msg));
ad7f8a1f
DA		 2911 msg.req_type = DP_REMOTE_I2C_READ;
2912 msg.u.i2c_read.num_transactions = num - 1;
2913 msg.u.i2c_read.port_number = port->port_num;
2914 for (i = 0; i < num - 1; i++) {
2915 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
2916 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
2917 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
2918 }
2919 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
2920 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
2921
2922 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
2923 if (!txmsg) {
2924 ret = -ENOMEM;
2925 goto out;
2926 }
2927
2928 txmsg->dst = mstb;
2929 drm_dp_encode_sideband_req(&msg, txmsg);
2930
2931 drm_dp_queue_down_tx(mgr, txmsg);
2932
2933 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
2934 if (ret > 0) {
2935
2936 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
2937 ret = -EREMOTEIO;
2938 goto out;
2939 }
2940 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
2941 ret = -EIO;
2942 goto out;
2943 }
2944 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
2945 ret = num;
2946 }
2947out:
2948 kfree(txmsg);
2949 drm_dp_put_mst_branch_device(mstb);
2950 return ret;
2951}
2952
2953static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
2954{
2955 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
2956 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
2957 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
2958 I2C_FUNC_10BIT_ADDR;
2959}
2960
2961static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
2962 .functionality = drm_dp_mst_i2c_functionality,
2963 .master_xfer = drm_dp_mst_i2c_xfer,
2964};
2965
2966/**
2967 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
2968 * @aux: DisplayPort AUX channel
2969 *
2970 * Returns 0 on success or a negative error code on failure.
2971 */
2972static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
2973{
2974 aux->ddc.algo = &drm_dp_mst_i2c_algo;
2975 aux->ddc.algo_data = aux;
2976 aux->ddc.retries = 3;
2977
2978 aux->ddc.class = I2C_CLASS_DDC;
2979 aux->ddc.owner = THIS_MODULE;
2980 aux->ddc.dev.parent = aux->dev;
2981 aux->ddc.dev.of_node = aux->dev->of_node;
2982
2983 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
2984 sizeof(aux->ddc.name));
2985
2986 return i2c_add_adapter(&aux->ddc);
2987}
2988
2989/**
2990 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
2991 * @aux: DisplayPort AUX channel
2992 */
2993static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
2994{
2995 i2c_del_adapter(&aux->ddc);
2996}
Linux 6.x block layer and io_uring tree(s)