2 * Copyright © 2014 Red Hat
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.
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
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/sched.h>
27 #include <linux/seq_file.h>
28 #include <linux/i2c.h>
29 #include <drm/drm_dp_mst_helper.h>
32 #include <drm/drm_fixed.h>
37 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
38 * protocol. The helpers contain a topology manager and bandwidth manager.
39 * The helpers encapsulate the sending and received of sideband msgs.
41 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
43 static int test_calc_pbn_mode(void);
45 static void drm_dp_put_port(struct drm_dp_mst_port *port);
47 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
49 struct drm_dp_payload *payload);
51 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
52 struct drm_dp_mst_port *port,
53 int offset, int size, u8 *bytes);
55 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
56 struct drm_dp_mst_branch *mstb);
57 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
58 struct drm_dp_mst_branch *mstb,
59 struct drm_dp_mst_port *port);
60 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
63 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
64 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
65 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
66 /* sideband msg handling */
67 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
72 int number_of_bits = num_nibbles * 4;
75 while (number_of_bits != 0) {
78 remainder |= (data[array_index] & bitmask) >> bitshift;
86 if ((remainder & 0x10) == 0x10)
91 while (number_of_bits != 0) {
94 if ((remainder & 0x10) != 0)
101 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
106 int number_of_bits = number_of_bytes * 8;
109 while (number_of_bits != 0) {
112 remainder |= (data[array_index] & bitmask) >> bitshift;
120 if ((remainder & 0x100) == 0x100)
125 while (number_of_bits != 0) {
128 if ((remainder & 0x100) != 0)
132 return remainder & 0xff;
134 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
137 size += (hdr->lct / 2);
141 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
147 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
148 for (i = 0; i < (hdr->lct / 2); i++)
149 buf[idx++] = hdr->rad[i];
150 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
151 (hdr->msg_len & 0x3f);
152 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
154 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
155 buf[idx - 1] |= (crc4 & 0xf);
160 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
161 u8 *buf, int buflen, u8 *hdrlen)
170 len += ((buf[0] & 0xf0) >> 4) / 2;
173 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
175 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
176 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
180 hdr->lct = (buf[0] & 0xf0) >> 4;
181 hdr->lcr = (buf[0] & 0xf);
183 for (i = 0; i < (hdr->lct / 2); i++)
184 hdr->rad[i] = buf[idx++];
185 hdr->broadcast = (buf[idx] >> 7) & 0x1;
186 hdr->path_msg = (buf[idx] >> 6) & 0x1;
187 hdr->msg_len = buf[idx] & 0x3f;
189 hdr->somt = (buf[idx] >> 7) & 0x1;
190 hdr->eomt = (buf[idx] >> 6) & 0x1;
191 hdr->seqno = (buf[idx] >> 4) & 0x1;
197 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
198 struct drm_dp_sideband_msg_tx *raw)
203 buf[idx++] = req->req_type & 0x7f;
205 switch (req->req_type) {
206 case DP_ENUM_PATH_RESOURCES:
207 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
210 case DP_ALLOCATE_PAYLOAD:
211 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
212 (req->u.allocate_payload.number_sdp_streams & 0xf);
214 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
216 buf[idx] = (req->u.allocate_payload.pbn >> 8);
218 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
220 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
221 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
222 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
225 if (req->u.allocate_payload.number_sdp_streams & 1) {
226 i = req->u.allocate_payload.number_sdp_streams - 1;
227 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
231 case DP_QUERY_PAYLOAD:
232 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
234 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
237 case DP_REMOTE_DPCD_READ:
238 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
239 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
241 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
243 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
245 buf[idx] = (req->u.dpcd_read.num_bytes);
249 case DP_REMOTE_DPCD_WRITE:
250 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
251 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
253 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
255 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
257 buf[idx] = (req->u.dpcd_write.num_bytes);
259 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
260 idx += req->u.dpcd_write.num_bytes;
262 case DP_REMOTE_I2C_READ:
263 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
264 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
266 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
267 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
269 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
271 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
272 idx += req->u.i2c_read.transactions[i].num_bytes;
274 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
275 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
278 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
280 buf[idx] = (req->u.i2c_read.num_bytes_read);
284 case DP_REMOTE_I2C_WRITE:
285 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
287 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
289 buf[idx] = (req->u.i2c_write.num_bytes);
291 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
292 idx += req->u.i2c_write.num_bytes;
298 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
301 crc4 = drm_dp_msg_data_crc4(msg, len);
305 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
306 struct drm_dp_sideband_msg_tx *raw)
311 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
316 /* this adds a chunk of msg to the builder to get the final msg */
317 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
318 u8 *replybuf, u8 replybuflen, bool hdr)
325 struct drm_dp_sideband_msg_hdr recv_hdr;
326 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
328 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
332 /* get length contained in this portion */
333 msg->curchunk_len = recv_hdr.msg_len;
334 msg->curchunk_hdrlen = hdrlen;
336 /* we have already gotten an somt - don't bother parsing */
337 if (recv_hdr.somt && msg->have_somt)
341 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
342 msg->have_somt = true;
345 msg->have_eomt = true;
347 /* copy the bytes for the remainder of this header chunk */
348 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
349 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
351 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
352 msg->curchunk_idx += replybuflen;
355 if (msg->curchunk_idx >= msg->curchunk_len) {
357 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
358 /* copy chunk into bigger msg */
359 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
360 msg->curlen += msg->curchunk_len - 1;
365 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
366 struct drm_dp_sideband_msg_reply_body *repmsg)
370 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
372 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
374 if (idx > raw->curlen)
376 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
377 if (raw->msg[idx] & 0x80)
378 repmsg->u.link_addr.ports[i].input_port = 1;
380 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
381 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
384 if (idx > raw->curlen)
386 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
387 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
388 if (repmsg->u.link_addr.ports[i].input_port == 0)
389 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
391 if (idx > raw->curlen)
393 if (repmsg->u.link_addr.ports[i].input_port == 0) {
394 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
396 if (idx > raw->curlen)
398 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
400 if (idx > raw->curlen)
402 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
403 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
407 if (idx > raw->curlen)
413 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
417 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
418 struct drm_dp_sideband_msg_reply_body *repmsg)
421 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
423 if (idx > raw->curlen)
425 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
426 if (idx > raw->curlen)
429 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
432 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
436 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
437 struct drm_dp_sideband_msg_reply_body *repmsg)
440 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
442 if (idx > raw->curlen)
446 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
450 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
451 struct drm_dp_sideband_msg_reply_body *repmsg)
455 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
457 if (idx > raw->curlen)
459 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
462 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
465 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
469 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
470 struct drm_dp_sideband_msg_reply_body *repmsg)
473 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
475 if (idx > raw->curlen)
477 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
479 if (idx > raw->curlen)
481 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
483 if (idx > raw->curlen)
487 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
491 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
492 struct drm_dp_sideband_msg_reply_body *repmsg)
495 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
497 if (idx > raw->curlen)
499 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
501 if (idx > raw->curlen)
503 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
505 if (idx > raw->curlen)
509 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
513 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
514 struct drm_dp_sideband_msg_reply_body *repmsg)
517 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
519 if (idx > raw->curlen)
521 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
523 if (idx > raw->curlen)
527 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
531 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
532 struct drm_dp_sideband_msg_reply_body *msg)
534 memset(msg, 0, sizeof(*msg));
535 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
536 msg->req_type = (raw->msg[0] & 0x7f);
538 if (msg->reply_type) {
539 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
540 msg->u.nak.reason = raw->msg[17];
541 msg->u.nak.nak_data = raw->msg[18];
545 switch (msg->req_type) {
546 case DP_LINK_ADDRESS:
547 return drm_dp_sideband_parse_link_address(raw, msg);
548 case DP_QUERY_PAYLOAD:
549 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
550 case DP_REMOTE_DPCD_READ:
551 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
552 case DP_REMOTE_DPCD_WRITE:
553 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
554 case DP_REMOTE_I2C_READ:
555 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
556 case DP_ENUM_PATH_RESOURCES:
557 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
558 case DP_ALLOCATE_PAYLOAD:
559 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
561 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
566 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
567 struct drm_dp_sideband_msg_req_body *msg)
571 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
573 if (idx > raw->curlen)
576 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
578 if (idx > raw->curlen)
581 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
582 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
583 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
584 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
585 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
589 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
593 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
594 struct drm_dp_sideband_msg_req_body *msg)
598 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
600 if (idx > raw->curlen)
603 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
605 if (idx > raw->curlen)
608 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
612 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
616 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
617 struct drm_dp_sideband_msg_req_body *msg)
619 memset(msg, 0, sizeof(*msg));
620 msg->req_type = (raw->msg[0] & 0x7f);
622 switch (msg->req_type) {
623 case DP_CONNECTION_STATUS_NOTIFY:
624 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
625 case DP_RESOURCE_STATUS_NOTIFY:
626 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
628 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
633 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
635 struct drm_dp_sideband_msg_req_body req;
637 req.req_type = DP_REMOTE_DPCD_WRITE;
638 req.u.dpcd_write.port_number = port_num;
639 req.u.dpcd_write.dpcd_address = offset;
640 req.u.dpcd_write.num_bytes = num_bytes;
641 req.u.dpcd_write.bytes = bytes;
642 drm_dp_encode_sideband_req(&req, msg);
647 static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
649 struct drm_dp_sideband_msg_req_body req;
651 req.req_type = DP_LINK_ADDRESS;
652 drm_dp_encode_sideband_req(&req, msg);
656 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
658 struct drm_dp_sideband_msg_req_body req;
660 req.req_type = DP_ENUM_PATH_RESOURCES;
661 req.u.port_num.port_number = port_num;
662 drm_dp_encode_sideband_req(&req, msg);
663 msg->path_msg = true;
667 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
668 u8 vcpi, uint16_t pbn,
669 u8 number_sdp_streams,
672 struct drm_dp_sideband_msg_req_body req;
673 memset(&req, 0, sizeof(req));
674 req.req_type = DP_ALLOCATE_PAYLOAD;
675 req.u.allocate_payload.port_number = port_num;
676 req.u.allocate_payload.vcpi = vcpi;
677 req.u.allocate_payload.pbn = pbn;
678 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
679 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
681 drm_dp_encode_sideband_req(&req, msg);
682 msg->path_msg = true;
686 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
687 struct drm_dp_vcpi *vcpi)
691 mutex_lock(&mgr->payload_lock);
692 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
693 if (ret > mgr->max_payloads) {
695 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
699 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
700 if (vcpi_ret > mgr->max_payloads) {
702 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
706 set_bit(ret, &mgr->payload_mask);
707 set_bit(vcpi_ret, &mgr->vcpi_mask);
708 vcpi->vcpi = vcpi_ret + 1;
709 mgr->proposed_vcpis[ret - 1] = vcpi;
711 mutex_unlock(&mgr->payload_lock);
715 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
722 mutex_lock(&mgr->payload_lock);
723 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
724 clear_bit(vcpi - 1, &mgr->vcpi_mask);
726 for (i = 0; i < mgr->max_payloads; i++) {
727 if (mgr->proposed_vcpis[i])
728 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
729 mgr->proposed_vcpis[i] = NULL;
730 clear_bit(i + 1, &mgr->payload_mask);
733 mutex_unlock(&mgr->payload_lock);
736 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
737 struct drm_dp_sideband_msg_tx *txmsg)
742 * All updates to txmsg->state are protected by mgr->qlock, and the two
743 * cases we check here are terminal states. For those the barriers
744 * provided by the wake_up/wait_event pair are enough.
746 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX ||
747 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT);
751 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
752 struct drm_dp_sideband_msg_tx *txmsg)
754 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
757 ret = wait_event_timeout(mgr->tx_waitq,
758 check_txmsg_state(mgr, txmsg),
760 mutex_lock(&mstb->mgr->qlock);
762 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
767 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
769 /* dump some state */
773 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
774 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
775 list_del(&txmsg->next);
778 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
779 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
780 mstb->tx_slots[txmsg->seqno] = NULL;
784 mutex_unlock(&mgr->qlock);
789 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
791 struct drm_dp_mst_branch *mstb;
793 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
799 memcpy(mstb->rad, rad, lct / 2);
800 INIT_LIST_HEAD(&mstb->ports);
801 kref_init(&mstb->kref);
805 static void drm_dp_free_mst_port(struct kref *kref);
807 static void drm_dp_free_mst_branch_device(struct kref *kref)
809 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
810 if (mstb->port_parent) {
811 if (list_empty(&mstb->port_parent->next))
812 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
817 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
819 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
820 struct drm_dp_mst_port *port, *tmp;
821 bool wake_tx = false;
824 * init kref again to be used by ports to remove mst branch when it is
829 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
830 kref_get(&mstb->port_parent->kref);
833 * destroy all ports - don't need lock
834 * as there are no more references to the mst branch
835 * device at this point.
837 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
838 list_del(&port->next);
839 drm_dp_put_port(port);
842 /* drop any tx slots msg */
843 mutex_lock(&mstb->mgr->qlock);
844 if (mstb->tx_slots[0]) {
845 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
846 mstb->tx_slots[0] = NULL;
849 if (mstb->tx_slots[1]) {
850 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
851 mstb->tx_slots[1] = NULL;
854 mutex_unlock(&mstb->mgr->qlock);
857 wake_up(&mstb->mgr->tx_waitq);
859 kref_put(kref, drm_dp_free_mst_branch_device);
862 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
864 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
868 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
870 struct drm_dp_mst_branch *mstb;
873 case DP_PEER_DEVICE_DP_LEGACY_CONV:
874 case DP_PEER_DEVICE_SST_SINK:
875 /* remove i2c over sideband */
876 drm_dp_mst_unregister_i2c_bus(&port->aux);
878 case DP_PEER_DEVICE_MST_BRANCHING:
881 drm_dp_put_mst_branch_device(mstb);
886 static void drm_dp_destroy_port(struct kref *kref)
888 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
889 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
892 port->vcpi.num_slots = 0;
894 kfree(port->cached_edid);
897 * The only time we don't have a connector
898 * on an output port is if the connector init
901 if (port->connector) {
902 /* we can't destroy the connector here, as
903 * we might be holding the mode_config.mutex
904 * from an EDID retrieval */
906 mutex_lock(&mgr->destroy_connector_lock);
907 kref_get(&port->parent->kref);
908 list_add(&port->next, &mgr->destroy_connector_list);
909 mutex_unlock(&mgr->destroy_connector_lock);
910 schedule_work(&mgr->destroy_connector_work);
913 /* no need to clean up vcpi
914 * as if we have no connector we never setup a vcpi */
915 drm_dp_port_teardown_pdt(port, port->pdt);
920 static void drm_dp_put_port(struct drm_dp_mst_port *port)
922 kref_put(&port->kref, drm_dp_destroy_port);
925 static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find)
927 struct drm_dp_mst_port *port;
928 struct drm_dp_mst_branch *rmstb;
929 if (to_find == mstb) {
930 kref_get(&mstb->kref);
933 list_for_each_entry(port, &mstb->ports, next) {
935 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
943 static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
945 struct drm_dp_mst_branch *rmstb = NULL;
946 mutex_lock(&mgr->lock);
947 if (mgr->mst_primary)
948 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
949 mutex_unlock(&mgr->lock);
953 static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find)
955 struct drm_dp_mst_port *port, *mport;
957 list_for_each_entry(port, &mstb->ports, next) {
958 if (port == to_find) {
959 kref_get(&port->kref);
963 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
971 static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
973 struct drm_dp_mst_port *rport = NULL;
974 mutex_lock(&mgr->lock);
975 if (mgr->mst_primary)
976 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
977 mutex_unlock(&mgr->lock);
981 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
983 struct drm_dp_mst_port *port;
985 list_for_each_entry(port, &mstb->ports, next) {
986 if (port->port_num == port_num) {
987 kref_get(&port->kref);
996 * calculate a new RAD for this MST branch device
997 * if parent has an LCT of 2 then it has 1 nibble of RAD,
998 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1000 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1003 int parent_lct = port->parent->lct;
1005 int idx = (parent_lct - 1) / 2;
1006 if (parent_lct > 1) {
1007 memcpy(rad, port->parent->rad, idx + 1);
1008 shift = (parent_lct % 2) ? 4 : 0;
1012 rad[idx] |= port->port_num << shift;
1013 return parent_lct + 1;
1017 * return sends link address for new mstb
1019 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1023 bool send_link = false;
1024 switch (port->pdt) {
1025 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1026 case DP_PEER_DEVICE_SST_SINK:
1027 /* add i2c over sideband */
1028 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1030 case DP_PEER_DEVICE_MST_BRANCHING:
1031 lct = drm_dp_calculate_rad(port, rad);
1033 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1034 port->mstb->mgr = port->mgr;
1035 port->mstb->port_parent = port;
1043 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1047 memcpy(mstb->guid, guid, 16);
1049 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1050 if (mstb->port_parent) {
1051 ret = drm_dp_send_dpcd_write(
1059 ret = drm_dp_dpcd_write(
1068 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1071 size_t proppath_size)
1075 ksnprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1076 for (i = 0; i < (mstb->lct - 1); i++) {
1077 int shift = (i % 2) ? 0 : 4;
1078 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1079 ksnprintf(temp, sizeof(temp), "-%d", port_num);
1080 strlcat(proppath, temp, proppath_size);
1082 ksnprintf(temp, sizeof(temp), "-%d", pnum);
1083 strlcat(proppath, temp, proppath_size);
1086 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1088 struct drm_dp_link_addr_reply_port *port_msg)
1090 struct drm_dp_mst_port *port;
1092 bool created = false;
1095 port = drm_dp_get_port(mstb, port_msg->port_number);
1097 port = kzalloc(sizeof(*port), GFP_KERNEL);
1100 kref_init(&port->kref);
1101 port->parent = mstb;
1102 port->port_num = port_msg->port_number;
1103 port->mgr = mstb->mgr;
1104 port->aux.name = "DPMST";
1105 port->aux.dev = dev;
1108 old_pdt = port->pdt;
1109 old_ddps = port->ddps;
1112 port->pdt = port_msg->peer_device_type;
1113 port->input = port_msg->input_port;
1114 port->mcs = port_msg->mcs;
1115 port->ddps = port_msg->ddps;
1116 port->ldps = port_msg->legacy_device_plug_status;
1117 port->dpcd_rev = port_msg->dpcd_revision;
1118 port->num_sdp_streams = port_msg->num_sdp_streams;
1119 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1121 /* manage mstb port lists with mgr lock - take a reference
1124 mutex_lock(&mstb->mgr->lock);
1125 kref_get(&port->kref);
1126 list_add(&port->next, &mstb->ports);
1127 mutex_unlock(&mstb->mgr->lock);
1130 if (old_ddps != port->ddps) {
1133 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1135 port->available_pbn = 0;
1139 if (old_pdt != port->pdt && !port->input) {
1140 drm_dp_port_teardown_pdt(port, old_pdt);
1142 ret = drm_dp_port_setup_pdt(port);
1144 drm_dp_send_link_address(mstb->mgr, port->mstb);
1147 if (created && !port->input) {
1150 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1151 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1152 if (!port->connector) {
1153 /* remove it from the port list */
1154 mutex_lock(&mstb->mgr->lock);
1155 list_del(&port->next);
1156 mutex_unlock(&mstb->mgr->lock);
1157 /* drop port list reference */
1158 drm_dp_put_port(port);
1161 if (port->port_num >= DP_MST_LOGICAL_PORT_0) {
1162 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1163 drm_mode_connector_set_tile_property(port->connector);
1165 (*mstb->mgr->cbs->register_connector)(port->connector);
1169 /* put reference to this port */
1170 drm_dp_put_port(port);
1173 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1174 struct drm_dp_connection_status_notify *conn_stat)
1176 struct drm_dp_mst_port *port;
1179 bool dowork = false;
1180 port = drm_dp_get_port(mstb, conn_stat->port_number);
1184 old_ddps = port->ddps;
1185 old_pdt = port->pdt;
1186 port->pdt = conn_stat->peer_device_type;
1187 port->mcs = conn_stat->message_capability_status;
1188 port->ldps = conn_stat->legacy_device_plug_status;
1189 port->ddps = conn_stat->displayport_device_plug_status;
1191 if (old_ddps != port->ddps) {
1195 port->available_pbn = 0;
1198 if (old_pdt != port->pdt && !port->input) {
1199 drm_dp_port_teardown_pdt(port, old_pdt);
1201 if (drm_dp_port_setup_pdt(port))
1205 drm_dp_put_port(port);
1207 queue_work(system_long_wq, &mstb->mgr->work);
1211 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1214 struct drm_dp_mst_branch *mstb;
1215 struct drm_dp_mst_port *port;
1217 /* find the port by iterating down */
1219 mutex_lock(&mgr->lock);
1220 mstb = mgr->mst_primary;
1222 for (i = 0; i < lct - 1; i++) {
1223 int shift = (i % 2) ? 0 : 4;
1224 int port_num = (rad[i / 2] >> shift) & 0xf;
1226 list_for_each_entry(port, &mstb->ports, next) {
1227 if (port->port_num == port_num) {
1230 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1238 kref_get(&mstb->kref);
1240 mutex_unlock(&mgr->lock);
1244 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1245 struct drm_dp_mst_branch *mstb,
1248 struct drm_dp_mst_branch *found_mstb;
1249 struct drm_dp_mst_port *port;
1251 if (memcmp(mstb->guid, guid, 16) == 0)
1255 list_for_each_entry(port, &mstb->ports, next) {
1259 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1268 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1269 struct drm_dp_mst_topology_mgr *mgr,
1272 struct drm_dp_mst_branch *mstb;
1274 /* find the port by iterating down */
1275 mutex_lock(&mgr->lock);
1277 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1280 kref_get(&mstb->kref);
1282 mutex_unlock(&mgr->lock);
1286 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1287 struct drm_dp_mst_branch *mstb)
1289 struct drm_dp_mst_port *port;
1290 struct drm_dp_mst_branch *mstb_child;
1291 if (!mstb->link_address_sent)
1292 drm_dp_send_link_address(mgr, mstb);
1294 list_for_each_entry(port, &mstb->ports, next) {
1301 if (!port->available_pbn)
1302 drm_dp_send_enum_path_resources(mgr, mstb, port);
1305 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1307 drm_dp_check_and_send_link_address(mgr, mstb_child);
1308 drm_dp_put_mst_branch_device(mstb_child);
1314 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1316 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1317 struct drm_dp_mst_branch *mstb;
1319 mutex_lock(&mgr->lock);
1320 mstb = mgr->mst_primary;
1322 kref_get(&mstb->kref);
1324 mutex_unlock(&mgr->lock);
1326 drm_dp_check_and_send_link_address(mgr, mstb);
1327 drm_dp_put_mst_branch_device(mstb);
1331 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1334 static u8 zero_guid[16];
1336 if (!memcmp(guid, zero_guid, 16)) {
1337 u64 salt = get_jiffies_64();
1338 memcpy(&guid[0], &salt, sizeof(u64));
1339 memcpy(&guid[8], &salt, sizeof(u64));
1346 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1348 struct drm_dp_sideband_msg_req_body req;
1350 req.req_type = DP_REMOTE_DPCD_READ;
1351 req.u.dpcd_read.port_number = port_num;
1352 req.u.dpcd_read.dpcd_address = offset;
1353 req.u.dpcd_read.num_bytes = num_bytes;
1354 drm_dp_encode_sideband_req(&req, msg);
1360 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1361 bool up, u8 *msg, int len)
1364 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1365 int tosend, total, offset;
1372 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1374 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1377 if (ret != tosend) {
1378 if (ret == -EIO && retries < 5) {
1382 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1388 } while (total > 0);
1392 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1393 struct drm_dp_sideband_msg_tx *txmsg)
1395 struct drm_dp_mst_branch *mstb = txmsg->dst;
1398 /* both msg slots are full */
1399 if (txmsg->seqno == -1) {
1400 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1401 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1404 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1405 txmsg->seqno = mstb->last_seqno;
1406 mstb->last_seqno ^= 1;
1407 } else if (mstb->tx_slots[0] == NULL)
1411 mstb->tx_slots[txmsg->seqno] = txmsg;
1414 req_type = txmsg->msg[0] & 0x7f;
1415 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1416 req_type == DP_RESOURCE_STATUS_NOTIFY)
1420 hdr->path_msg = txmsg->path_msg;
1421 hdr->lct = mstb->lct;
1422 hdr->lcr = mstb->lct - 1;
1424 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1425 hdr->seqno = txmsg->seqno;
1429 * process a single block of the next message in the sideband queue
1431 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1432 struct drm_dp_sideband_msg_tx *txmsg,
1436 struct drm_dp_sideband_msg_hdr hdr;
1437 int len, space, idx, tosend;
1440 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1442 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1444 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1447 /* make hdr from dst mst - for replies use seqno
1448 otherwise assign one */
1449 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1453 /* amount left to send in this message */
1454 len = txmsg->cur_len - txmsg->cur_offset;
1456 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1457 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1459 tosend = min(len, space);
1460 if (len == txmsg->cur_len)
1466 hdr.msg_len = tosend + 1;
1467 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1468 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1469 /* add crc at end */
1470 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1473 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1475 DRM_DEBUG_KMS("sideband msg failed to send\n");
1479 txmsg->cur_offset += tosend;
1480 if (txmsg->cur_offset == txmsg->cur_len) {
1481 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1487 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1489 struct drm_dp_sideband_msg_tx *txmsg;
1492 WARN_ON(!mutex_is_locked(&mgr->qlock));
1494 /* construct a chunk from the first msg in the tx_msg queue */
1495 if (list_empty(&mgr->tx_msg_downq)) {
1496 mgr->tx_down_in_progress = false;
1499 mgr->tx_down_in_progress = true;
1501 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1502 ret = process_single_tx_qlock(mgr, txmsg, false);
1504 /* txmsg is sent it should be in the slots now */
1505 list_del(&txmsg->next);
1507 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1508 list_del(&txmsg->next);
1509 if (txmsg->seqno != -1)
1510 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1511 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1512 wake_up(&mgr->tx_waitq);
1514 if (list_empty(&mgr->tx_msg_downq)) {
1515 mgr->tx_down_in_progress = false;
1520 /* called holding qlock */
1521 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1522 struct drm_dp_sideband_msg_tx *txmsg)
1526 /* construct a chunk from the first msg in the tx_msg queue */
1527 ret = process_single_tx_qlock(mgr, txmsg, true);
1530 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1532 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1535 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1536 struct drm_dp_sideband_msg_tx *txmsg)
1538 mutex_lock(&mgr->qlock);
1539 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1540 if (!mgr->tx_down_in_progress)
1541 process_single_down_tx_qlock(mgr);
1542 mutex_unlock(&mgr->qlock);
1545 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1546 struct drm_dp_mst_branch *mstb)
1549 struct drm_dp_sideband_msg_tx *txmsg;
1552 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1557 len = build_link_address(txmsg);
1559 mstb->link_address_sent = true;
1560 drm_dp_queue_down_tx(mgr, txmsg);
1562 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1566 if (txmsg->reply.reply_type == 1)
1567 DRM_DEBUG_KMS("link address nak received\n");
1569 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1570 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1571 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,
1572 txmsg->reply.u.link_addr.ports[i].input_port,
1573 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1574 txmsg->reply.u.link_addr.ports[i].port_number,
1575 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1576 txmsg->reply.u.link_addr.ports[i].mcs,
1577 txmsg->reply.u.link_addr.ports[i].ddps,
1578 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1579 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1580 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1583 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1585 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1586 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1588 (*mgr->cbs->hotplug)(mgr);
1591 mstb->link_address_sent = false;
1592 DRM_DEBUG_KMS("link address failed %d\n", ret);
1598 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1599 struct drm_dp_mst_branch *mstb,
1600 struct drm_dp_mst_port *port)
1603 struct drm_dp_sideband_msg_tx *txmsg;
1606 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1611 len = build_enum_path_resources(txmsg, port->port_num);
1613 drm_dp_queue_down_tx(mgr, txmsg);
1615 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1617 if (txmsg->reply.reply_type == 1)
1618 DRM_DEBUG_KMS("enum path resources nak received\n");
1620 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1621 DRM_ERROR("got incorrect port in response\n");
1622 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,
1623 txmsg->reply.u.path_resources.avail_payload_bw_number);
1624 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1632 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1634 if (!mstb->port_parent)
1637 if (mstb->port_parent->mstb != mstb)
1638 return mstb->port_parent;
1640 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1643 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1644 struct drm_dp_mst_branch *mstb,
1647 struct drm_dp_mst_branch *rmstb = NULL;
1648 struct drm_dp_mst_port *found_port;
1649 mutex_lock(&mgr->lock);
1650 if (mgr->mst_primary) {
1651 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1654 rmstb = found_port->parent;
1655 kref_get(&rmstb->kref);
1656 *port_num = found_port->port_num;
1659 mutex_unlock(&mgr->lock);
1663 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1664 struct drm_dp_mst_port *port,
1668 struct drm_dp_sideband_msg_tx *txmsg;
1669 struct drm_dp_mst_branch *mstb;
1670 int len, ret, port_num;
1671 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1674 port = drm_dp_get_validated_port_ref(mgr, port);
1678 port_num = port->port_num;
1679 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1681 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1684 drm_dp_put_port(port);
1689 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1695 for (i = 0; i < port->num_sdp_streams; i++)
1699 len = build_allocate_payload(txmsg, port_num,
1701 pbn, port->num_sdp_streams, sinks);
1703 drm_dp_queue_down_tx(mgr, txmsg);
1705 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1707 if (txmsg->reply.reply_type == 1) {
1714 drm_dp_put_mst_branch_device(mstb);
1715 drm_dp_put_port(port);
1719 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1721 struct drm_dp_payload *payload)
1725 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1727 payload->payload_state = 0;
1730 payload->payload_state = DP_PAYLOAD_LOCAL;
1734 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1735 struct drm_dp_mst_port *port,
1737 struct drm_dp_payload *payload)
1740 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1743 payload->payload_state = DP_PAYLOAD_REMOTE;
1747 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1748 struct drm_dp_mst_port *port,
1750 struct drm_dp_payload *payload)
1752 DRM_DEBUG_KMS("\n");
1753 /* its okay for these to fail */
1755 drm_dp_payload_send_msg(mgr, port, id, 0);
1758 drm_dp_dpcd_write_payload(mgr, id, payload);
1759 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1763 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1765 struct drm_dp_payload *payload)
1767 payload->payload_state = 0;
1772 * drm_dp_update_payload_part1() - Execute payload update part 1
1773 * @mgr: manager to use.
1775 * This iterates over all proposed virtual channels, and tries to
1776 * allocate space in the link for them. For 0->slots transitions,
1777 * this step just writes the VCPI to the MST device. For slots->0
1778 * transitions, this writes the updated VCPIs and removes the
1779 * remote VC payloads.
1781 * after calling this the driver should generate ACT and payload
1784 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1788 struct drm_dp_payload req_payload;
1789 struct drm_dp_mst_port *port;
1791 mutex_lock(&mgr->payload_lock);
1792 for (i = 0; i < mgr->max_payloads; i++) {
1793 /* solve the current payloads - compare to the hw ones
1794 - update the hw view */
1795 req_payload.start_slot = cur_slots;
1796 if (mgr->proposed_vcpis[i]) {
1797 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1798 port = drm_dp_get_validated_port_ref(mgr, port);
1800 mutex_unlock(&mgr->payload_lock);
1803 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1804 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1807 req_payload.num_slots = 0;
1810 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1811 mgr->payloads[i].start_slot = req_payload.start_slot;
1813 /* work out what is required to happen with this payload */
1814 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1816 /* need to push an update for this payload */
1817 if (req_payload.num_slots) {
1818 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1819 mgr->payloads[i].num_slots = req_payload.num_slots;
1820 mgr->payloads[i].vcpi = req_payload.vcpi;
1821 } else if (mgr->payloads[i].num_slots) {
1822 mgr->payloads[i].num_slots = 0;
1823 drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]);
1824 req_payload.payload_state = mgr->payloads[i].payload_state;
1825 mgr->payloads[i].start_slot = 0;
1827 mgr->payloads[i].payload_state = req_payload.payload_state;
1829 cur_slots += req_payload.num_slots;
1832 drm_dp_put_port(port);
1835 for (i = 0; i < mgr->max_payloads; i++) {
1836 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1837 DRM_DEBUG_KMS("removing payload %d\n", i);
1838 for (j = i; j < mgr->max_payloads - 1; j++) {
1839 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1840 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1841 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1842 set_bit(j + 1, &mgr->payload_mask);
1844 clear_bit(j + 1, &mgr->payload_mask);
1847 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1848 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1849 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1853 mutex_unlock(&mgr->payload_lock);
1857 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1860 * drm_dp_update_payload_part2() - Execute payload update part 2
1861 * @mgr: manager to use.
1863 * This iterates over all proposed virtual channels, and tries to
1864 * allocate space in the link for them. For 0->slots transitions,
1865 * this step writes the remote VC payload commands. For slots->0
1866 * this just resets some internal state.
1868 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1870 struct drm_dp_mst_port *port;
1873 mutex_lock(&mgr->payload_lock);
1874 for (i = 0; i < mgr->max_payloads; i++) {
1876 if (!mgr->proposed_vcpis[i])
1879 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1881 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1882 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1883 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1884 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1885 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1888 mutex_unlock(&mgr->payload_lock);
1892 mutex_unlock(&mgr->payload_lock);
1895 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1897 #if 0 /* unused as of yet */
1898 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1899 struct drm_dp_mst_port *port,
1900 int offset, int size)
1903 struct drm_dp_sideband_msg_tx *txmsg;
1905 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1909 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1910 txmsg->dst = port->parent;
1912 drm_dp_queue_down_tx(mgr, txmsg);
1918 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1919 struct drm_dp_mst_port *port,
1920 int offset, int size, u8 *bytes)
1924 struct drm_dp_sideband_msg_tx *txmsg;
1925 struct drm_dp_mst_branch *mstb;
1927 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1931 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1937 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1940 drm_dp_queue_down_tx(mgr, txmsg);
1942 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1944 if (txmsg->reply.reply_type == 1) {
1951 drm_dp_put_mst_branch_device(mstb);
1955 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1957 struct drm_dp_sideband_msg_reply_body reply;
1959 reply.reply_type = 0;
1960 reply.req_type = req_type;
1961 drm_dp_encode_sideband_reply(&reply, msg);
1965 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1966 struct drm_dp_mst_branch *mstb,
1967 int req_type, int seqno, bool broadcast)
1969 struct drm_dp_sideband_msg_tx *txmsg;
1971 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1976 txmsg->seqno = seqno;
1977 drm_dp_encode_up_ack_reply(txmsg, req_type);
1979 mutex_lock(&mgr->qlock);
1981 process_single_up_tx_qlock(mgr, txmsg);
1983 mutex_unlock(&mgr->qlock);
1989 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
1993 switch (dp_link_bw) {
1995 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1996 dp_link_bw, dp_link_count);
1999 case DP_LINK_BW_1_62:
2000 *out = 3 * dp_link_count;
2002 case DP_LINK_BW_2_7:
2003 *out = 5 * dp_link_count;
2005 case DP_LINK_BW_5_4:
2006 *out = 10 * dp_link_count;
2013 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2014 * @mgr: manager to set state for
2015 * @mst_state: true to enable MST on this connector - false to disable.
2017 * This is called by the driver when it detects an MST capable device plugged
2018 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2020 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2023 struct drm_dp_mst_branch *mstb = NULL;
2025 mutex_lock(&mgr->lock);
2026 if (mst_state == mgr->mst_state)
2029 mgr->mst_state = mst_state;
2030 /* set the device into MST mode */
2032 WARN_ON(mgr->mst_primary);
2035 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2036 if (ret != DP_RECEIVER_CAP_SIZE) {
2037 DRM_DEBUG_KMS("failed to read DPCD\n");
2041 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2042 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2048 mgr->total_pbn = 2560;
2049 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div);
2050 mgr->avail_slots = mgr->total_slots;
2052 /* add initial branch device at LCT 1 */
2053 mstb = drm_dp_add_mst_branch_device(1, NULL);
2060 /* give this the main reference */
2061 mgr->mst_primary = mstb;
2062 kref_get(&mgr->mst_primary->kref);
2064 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2065 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2071 struct drm_dp_payload reset_pay;
2072 reset_pay.start_slot = 0;
2073 reset_pay.num_slots = 0x3f;
2074 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2077 queue_work(system_long_wq, &mgr->work);
2081 /* disable MST on the device */
2082 mstb = mgr->mst_primary;
2083 mgr->mst_primary = NULL;
2084 /* this can fail if the device is gone */
2085 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2087 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2088 mgr->payload_mask = 0;
2089 set_bit(0, &mgr->payload_mask);
2094 mutex_unlock(&mgr->lock);
2096 drm_dp_put_mst_branch_device(mstb);
2100 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2103 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2104 * @mgr: manager to suspend
2106 * This function tells the MST device that we can't handle UP messages
2107 * anymore. This should stop it from sending any since we are suspended.
2109 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2111 mutex_lock(&mgr->lock);
2112 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2113 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2114 mutex_unlock(&mgr->lock);
2115 flush_work(&mgr->work);
2116 flush_work(&mgr->destroy_connector_work);
2118 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2121 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2122 * @mgr: manager to resume
2124 * This will fetch DPCD and see if the device is still there,
2125 * if it is, it will rewrite the MSTM control bits, and return.
2127 * if the device fails this returns -1, and the driver should do
2128 * a full MST reprobe, in case we were undocked.
2130 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2134 mutex_lock(&mgr->lock);
2136 if (mgr->mst_primary) {
2140 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2141 if (sret != DP_RECEIVER_CAP_SIZE) {
2142 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2147 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2148 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2150 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2155 /* Some hubs forget their guids after they resume */
2156 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2158 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2162 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2169 mutex_unlock(&mgr->lock);
2172 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2174 static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2178 int replylen, origlen, curreply;
2180 struct drm_dp_sideband_msg_rx *msg;
2181 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2182 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2184 len = min(mgr->max_dpcd_transaction_bytes, 16);
2185 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2188 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2191 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2193 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2196 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2201 while (replylen > 0) {
2202 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2203 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2206 DRM_DEBUG_KMS("failed to read a chunk\n");
2208 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2210 DRM_DEBUG_KMS("failed to build sideband msg\n");
2216 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2220 drm_dp_get_one_sb_msg(mgr, false);
2222 if (mgr->down_rep_recv.have_eomt) {
2223 struct drm_dp_sideband_msg_tx *txmsg;
2224 struct drm_dp_mst_branch *mstb;
2226 mstb = drm_dp_get_mst_branch_device(mgr,
2227 mgr->down_rep_recv.initial_hdr.lct,
2228 mgr->down_rep_recv.initial_hdr.rad);
2231 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2232 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2236 /* find the message */
2237 slot = mgr->down_rep_recv.initial_hdr.seqno;
2238 mutex_lock(&mgr->qlock);
2239 txmsg = mstb->tx_slots[slot];
2240 /* remove from slots */
2241 mutex_unlock(&mgr->qlock);
2244 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2246 mgr->down_rep_recv.initial_hdr.seqno,
2247 mgr->down_rep_recv.initial_hdr.lct,
2248 mgr->down_rep_recv.initial_hdr.rad[0],
2249 mgr->down_rep_recv.msg[0]);
2250 drm_dp_put_mst_branch_device(mstb);
2251 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2255 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2256 if (txmsg->reply.reply_type == 1) {
2257 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);
2260 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2261 drm_dp_put_mst_branch_device(mstb);
2263 mutex_lock(&mgr->qlock);
2264 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2265 mstb->tx_slots[slot] = NULL;
2266 mutex_unlock(&mgr->qlock);
2268 wake_up(&mgr->tx_waitq);
2273 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2276 drm_dp_get_one_sb_msg(mgr, true);
2278 if (mgr->up_req_recv.have_eomt) {
2279 struct drm_dp_sideband_msg_req_body msg;
2280 struct drm_dp_mst_branch *mstb = NULL;
2283 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2284 mstb = drm_dp_get_mst_branch_device(mgr,
2285 mgr->up_req_recv.initial_hdr.lct,
2286 mgr->up_req_recv.initial_hdr.rad);
2288 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2289 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2294 seqno = mgr->up_req_recv.initial_hdr.seqno;
2295 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2297 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2298 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2301 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2304 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2305 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2309 drm_dp_update_port(mstb, &msg.u.conn_stat);
2311 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);
2312 (*mgr->cbs->hotplug)(mgr);
2314 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2315 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2317 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2320 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2321 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2325 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2328 drm_dp_put_mst_branch_device(mstb);
2329 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2335 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2336 * @mgr: manager to notify irq for.
2337 * @esi: 4 bytes from SINK_COUNT_ESI
2338 * @handled: whether the hpd interrupt was consumed or not
2340 * This should be called from the driver when it detects a short IRQ,
2341 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2342 * topology manager will process the sideband messages received as a result
2345 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2352 if (sc != mgr->sink_count) {
2353 mgr->sink_count = sc;
2357 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2358 ret = drm_dp_mst_handle_down_rep(mgr);
2362 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2363 ret |= drm_dp_mst_handle_up_req(mgr);
2367 drm_dp_mst_kick_tx(mgr);
2370 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2373 * drm_dp_mst_detect_port() - get connection status for an MST port
2374 * @mgr: manager for this port
2375 * @port: unverified pointer to a port
2377 * This returns the current connection state for a port. It validates the
2378 * port pointer still exists so the caller doesn't require a reference
2380 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2381 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2383 enum drm_connector_status status = connector_status_disconnected;
2385 /* we need to search for the port in the mgr in case its gone */
2386 port = drm_dp_get_validated_port_ref(mgr, port);
2388 return connector_status_disconnected;
2393 switch (port->pdt) {
2394 case DP_PEER_DEVICE_NONE:
2395 case DP_PEER_DEVICE_MST_BRANCHING:
2398 case DP_PEER_DEVICE_SST_SINK:
2399 status = connector_status_connected;
2400 /* for logical ports - cache the EDID */
2401 if (port->port_num >= 8 && !port->cached_edid) {
2402 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2405 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2407 status = connector_status_connected;
2411 drm_dp_put_port(port);
2414 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2417 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2418 * @mgr: manager for this port
2419 * @port: unverified pointer to a port.
2421 * This returns whether the port supports audio or not.
2423 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2424 struct drm_dp_mst_port *port)
2428 port = drm_dp_get_validated_port_ref(mgr, port);
2431 ret = port->has_audio;
2432 drm_dp_put_port(port);
2435 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2438 * drm_dp_mst_get_edid() - get EDID for an MST port
2439 * @connector: toplevel connector to get EDID for
2440 * @mgr: manager for this port
2441 * @port: unverified pointer to a port.
2443 * This returns an EDID for the port connected to a connector,
2444 * It validates the pointer still exists so the caller doesn't require a
2447 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2449 struct edid *edid = NULL;
2451 /* we need to search for the port in the mgr in case its gone */
2452 port = drm_dp_get_validated_port_ref(mgr, port);
2456 if (port->cached_edid)
2457 edid = drm_edid_duplicate(port->cached_edid);
2459 edid = drm_get_edid(connector, &port->aux.ddc);
2460 drm_mode_connector_set_tile_property(connector);
2462 port->has_audio = drm_detect_monitor_audio(edid);
2463 drm_dp_put_port(port);
2466 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2469 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2470 * @mgr: manager to use
2471 * @pbn: payload bandwidth to convert into slots.
2473 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2478 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2480 if (num_slots > mgr->avail_slots)
2484 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2486 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2487 struct drm_dp_vcpi *vcpi, int pbn)
2492 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2494 if (num_slots > mgr->avail_slots)
2498 vcpi->aligned_pbn = num_slots * mgr->pbn_div;
2499 vcpi->num_slots = num_slots;
2501 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2508 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2509 * @mgr: manager for this port
2510 * @port: port to allocate a virtual channel for.
2511 * @pbn: payload bandwidth number to request
2512 * @slots: returned number of slots for this PBN.
2514 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots)
2518 port = drm_dp_get_validated_port_ref(mgr, port);
2522 if (port->vcpi.vcpi > 0) {
2523 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2524 if (pbn == port->vcpi.pbn) {
2525 *slots = port->vcpi.num_slots;
2526 drm_dp_put_port(port);
2531 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn);
2533 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret);
2536 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots);
2537 *slots = port->vcpi.num_slots;
2539 drm_dp_put_port(port);
2544 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2546 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2549 port = drm_dp_get_validated_port_ref(mgr, port);
2553 slots = port->vcpi.num_slots;
2554 drm_dp_put_port(port);
2557 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2560 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2561 * @mgr: manager for this port
2562 * @port: unverified pointer to a port.
2564 * This just resets the number of slots for the ports VCPI for later programming.
2566 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2568 port = drm_dp_get_validated_port_ref(mgr, port);
2571 port->vcpi.num_slots = 0;
2572 drm_dp_put_port(port);
2574 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2577 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2578 * @mgr: manager for this port
2579 * @port: unverified port to deallocate vcpi for
2581 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2583 port = drm_dp_get_validated_port_ref(mgr, port);
2587 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2588 port->vcpi.num_slots = 0;
2590 port->vcpi.aligned_pbn = 0;
2591 port->vcpi.vcpi = 0;
2592 drm_dp_put_port(port);
2594 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2596 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2597 int id, struct drm_dp_payload *payload)
2599 u8 payload_alloc[3], status;
2603 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2604 DP_PAYLOAD_TABLE_UPDATED);
2606 payload_alloc[0] = id;
2607 payload_alloc[1] = payload->start_slot;
2608 payload_alloc[2] = payload->num_slots;
2610 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2612 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2617 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2619 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2623 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2626 usleep_range(10000, 20000);
2629 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2640 * drm_dp_check_act_status() - Check ACT handled status.
2641 * @mgr: manager to use
2643 * Check the payload status bits in the DPCD for ACT handled completion.
2645 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2652 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2655 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2659 if (status & DP_PAYLOAD_ACT_HANDLED)
2664 } while (count < 30);
2666 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2667 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2675 EXPORT_SYMBOL(drm_dp_check_act_status);
2678 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2679 * @clock: dot clock for the mode
2680 * @bpp: bpp for the mode.
2682 * This uses the formula in the spec to calculate the PBN value for a mode.
2684 int drm_dp_calc_pbn_mode(int clock, int bpp)
2694 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2695 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2696 * common multiplier to render an integer PBN for all link rate/lane
2697 * counts combinations
2699 * peak_kbps *= (1006/1000)
2700 * peak_kbps *= (64/54)
2701 * peak_kbps *= 8 convert to bytes
2704 numerator = 64 * 1006;
2705 denominator = 54 * 8 * 1000 * 1000;
2708 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2710 return drm_fixp2int_ceil(peak_kbps);
2712 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2714 static int test_calc_pbn_mode(void)
2717 ret = drm_dp_calc_pbn_mode(154000, 30);
2719 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2720 154000, 30, 689, ret);
2723 ret = drm_dp_calc_pbn_mode(234000, 30);
2725 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2726 234000, 30, 1047, ret);
2729 ret = drm_dp_calc_pbn_mode(297000, 24);
2731 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2732 297000, 24, 1063, ret);
2738 /* we want to kick the TX after we've ack the up/down IRQs. */
2739 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2741 queue_work(system_long_wq, &mgr->tx_work);
2744 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2745 struct drm_dp_mst_branch *mstb)
2747 struct drm_dp_mst_port *port;
2748 int tabs = mstb->lct;
2752 for (i = 0; i < tabs; i++)
2756 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2757 list_for_each_entry(port, &mstb->ports, next) {
2758 seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
2760 drm_dp_mst_dump_mstb(m, port->mstb);
2764 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2769 for (i = 0; i < 4; i++) {
2770 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
2779 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2780 struct drm_dp_mst_port *port, char *name,
2783 struct edid *mst_edid;
2785 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2786 drm_edid_get_monitor_name(mst_edid, name, namelen);
2790 * drm_dp_mst_dump_topology(): dump topology to seq file.
2791 * @m: seq_file to dump output to
2792 * @mgr: manager to dump current topology for.
2794 * helper to dump MST topology to a seq file for debugfs.
2796 void drm_dp_mst_dump_topology(struct seq_file *m,
2797 struct drm_dp_mst_topology_mgr *mgr)
2800 struct drm_dp_mst_port *port;
2802 mutex_lock(&mgr->lock);
2803 if (mgr->mst_primary)
2804 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2807 mutex_unlock(&mgr->lock);
2809 mutex_lock(&mgr->payload_lock);
2810 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2813 for (i = 0; i < mgr->max_payloads; i++) {
2814 if (mgr->proposed_vcpis[i]) {
2817 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2818 fetch_monitor_name(mgr, port, name, sizeof(name));
2819 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2820 port->port_num, port->vcpi.vcpi,
2821 port->vcpi.num_slots,
2822 (*name != 0) ? name : "Unknown");
2824 seq_printf(m, "vcpi %d:unused\n", i);
2826 for (i = 0; i < mgr->max_payloads; i++) {
2827 seq_printf(m, "payload %d: %d, %d, %d\n",
2829 mgr->payloads[i].payload_state,
2830 mgr->payloads[i].start_slot,
2831 mgr->payloads[i].num_slots);
2835 mutex_unlock(&mgr->payload_lock);
2837 mutex_lock(&mgr->lock);
2838 if (mgr->mst_primary) {
2842 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2843 seq_printf(m, "dpcd: ");
2844 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
2845 seq_printf(m, "%02x ", buf[i]);
2846 seq_printf(m, "\n");
2847 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2848 seq_printf(m, "faux/mst: ");
2849 for (i = 0; i < 2; i++)
2850 seq_printf(m, "%02x ", buf[i]);
2851 seq_printf(m, "\n");
2852 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2853 seq_printf(m, "mst ctrl: ");
2854 for (i = 0; i < 1; i++)
2855 seq_printf(m, "%02x ", buf[i]);
2856 seq_printf(m, "\n");
2858 /* dump the standard OUI branch header */
2859 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2860 seq_printf(m, "branch oui: ");
2861 for (i = 0; i < 0x3; i++)
2862 seq_printf(m, "%02x", buf[i]);
2863 seq_printf(m, " devid: ");
2864 for (i = 0x3; i < 0x8 && buf[i]; i++)
2865 seq_printf(m, "%c", buf[i]);
2867 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2868 seq_printf(m, "\n");
2869 bret = dump_dp_payload_table(mgr, buf);
2871 seq_printf(m, "payload table: ");
2872 for (i = 0; i < 63; i++)
2873 seq_printf(m, "%02x ", buf[i]);
2874 seq_printf(m, "\n");
2879 mutex_unlock(&mgr->lock);
2882 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2884 static void drm_dp_tx_work(struct work_struct *work)
2886 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2888 mutex_lock(&mgr->qlock);
2889 if (mgr->tx_down_in_progress)
2890 process_single_down_tx_qlock(mgr);
2891 mutex_unlock(&mgr->qlock);
2894 static void drm_dp_free_mst_port(struct kref *kref)
2896 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2897 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2901 static void drm_dp_destroy_connector_work(struct work_struct *work)
2903 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
2904 struct drm_dp_mst_port *port;
2905 bool send_hotplug = false;
2907 * Not a regular list traverse as we have to drop the destroy
2908 * connector lock before destroying the connector, to avoid AB->BA
2909 * ordering between this lock and the config mutex.
2912 mutex_lock(&mgr->destroy_connector_lock);
2913 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2915 mutex_unlock(&mgr->destroy_connector_lock);
2918 list_del(&port->next);
2919 mutex_unlock(&mgr->destroy_connector_lock);
2921 kref_init(&port->kref);
2922 INIT_LIST_HEAD(&port->next);
2924 mgr->cbs->destroy_connector(mgr, port->connector);
2926 drm_dp_port_teardown_pdt(port, port->pdt);
2928 if (!port->input && port->vcpi.vcpi > 0) {
2929 drm_dp_mst_reset_vcpi_slots(mgr, port);
2930 drm_dp_update_payload_part1(mgr);
2931 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2934 kref_put(&port->kref, drm_dp_free_mst_port);
2935 send_hotplug = true;
2938 (*mgr->cbs->hotplug)(mgr);
2942 * drm_dp_mst_topology_mgr_init - initialise a topology manager
2943 * @mgr: manager struct to initialise
2944 * @dev: device providing this structure - for i2c addition.
2945 * @aux: DP helper aux channel to talk to this device
2946 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
2947 * @max_payloads: maximum number of payloads this GPU can source
2948 * @conn_base_id: the connector object ID the MST device is connected to.
2950 * Return 0 for success, or negative error code on failure
2952 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
2953 struct device *dev, struct drm_dp_aux *aux,
2954 int max_dpcd_transaction_bytes,
2955 int max_payloads, int conn_base_id)
2957 lockinit(&mgr->lock, "drmml", 0, LK_CANRECURSE);
2958 lockinit(&mgr->qlock, "drmmql", 0, LK_CANRECURSE);
2959 lockinit(&mgr->payload_lock, "drmmpl", 0, LK_CANRECURSE);
2960 lockinit(&mgr->destroy_connector_lock, "drmmdcl", 0, LK_CANRECURSE);
2961 INIT_LIST_HEAD(&mgr->tx_msg_downq);
2962 INIT_LIST_HEAD(&mgr->destroy_connector_list);
2963 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
2964 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
2965 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
2966 init_waitqueue_head(&mgr->tx_waitq);
2969 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
2970 mgr->max_payloads = max_payloads;
2971 mgr->conn_base_id = conn_base_id;
2972 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
2973 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
2975 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
2978 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
2979 if (!mgr->proposed_vcpis)
2981 set_bit(0, &mgr->payload_mask);
2982 if (test_calc_pbn_mode() < 0)
2983 DRM_ERROR("MST PBN self-test failed\n");
2987 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
2990 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
2991 * @mgr: manager to destroy
2993 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
2995 flush_work(&mgr->work);
2996 flush_work(&mgr->destroy_connector_work);
2997 mutex_lock(&mgr->payload_lock);
2998 kfree(mgr->payloads);
2999 mgr->payloads = NULL;
3000 kfree(mgr->proposed_vcpis);
3001 mgr->proposed_vcpis = NULL;
3002 mutex_unlock(&mgr->payload_lock);
3006 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3009 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3012 struct drm_dp_aux *aux = adapter->algo_data;
3013 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3014 struct drm_dp_mst_branch *mstb;
3015 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3017 bool reading = false;
3018 struct drm_dp_sideband_msg_req_body msg;
3019 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3022 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3026 /* construct i2c msg */
3027 /* see if last msg is a read */
3028 if (msgs[num - 1].flags & I2C_M_RD)
3031 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3032 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3037 memset(&msg, 0, sizeof(msg));
3038 msg.req_type = DP_REMOTE_I2C_READ;
3039 msg.u.i2c_read.num_transactions = num - 1;
3040 msg.u.i2c_read.port_number = port->port_num;
3041 for (i = 0; i < num - 1; i++) {
3042 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3043 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3044 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3046 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3047 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3049 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3056 drm_dp_encode_sideband_req(&msg, txmsg);
3058 drm_dp_queue_down_tx(mgr, txmsg);
3060 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3063 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3067 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3071 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3076 drm_dp_put_mst_branch_device(mstb);
3080 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3082 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3083 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3084 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3085 I2C_FUNC_10BIT_ADDR;
3088 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3089 .functionality = drm_dp_mst_i2c_functionality,
3090 .master_xfer = drm_dp_mst_i2c_xfer,
3094 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3095 * @aux: DisplayPort AUX channel
3097 * Returns 0 on success or a negative error code on failure.
3099 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3101 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3102 aux->ddc.algo_data = aux;
3103 aux->ddc.retries = 3;
3106 aux->ddc.class = I2C_CLASS_DDC;
3107 aux->ddc.owner = THIS_MODULE;
3109 aux->ddc.dev.parent = aux->dev;
3111 aux->ddc.dev.of_node = aux->dev->of_node;
3114 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3115 sizeof(aux->ddc.name));
3117 return i2c_add_adapter(&aux->ddc);
3121 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3122 * @aux: DisplayPort AUX channel
3124 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3126 i2c_del_adapter(&aux->ddc);