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);
333 * ignore out-of-order messages or messages that are part of a
336 if (!recv_hdr.somt && !msg->have_somt)
339 /* get length contained in this portion */
340 msg->curchunk_len = recv_hdr.msg_len;
341 msg->curchunk_hdrlen = hdrlen;
343 /* we have already gotten an somt - don't bother parsing */
344 if (recv_hdr.somt && msg->have_somt)
348 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
349 msg->have_somt = true;
352 msg->have_eomt = true;
354 /* copy the bytes for the remainder of this header chunk */
355 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
356 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
358 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
359 msg->curchunk_idx += replybuflen;
362 if (msg->curchunk_idx >= msg->curchunk_len) {
364 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
365 /* copy chunk into bigger msg */
366 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
367 msg->curlen += msg->curchunk_len - 1;
372 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
373 struct drm_dp_sideband_msg_reply_body *repmsg)
377 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
379 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
381 if (idx > raw->curlen)
383 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
384 if (raw->msg[idx] & 0x80)
385 repmsg->u.link_addr.ports[i].input_port = 1;
387 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
388 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
391 if (idx > raw->curlen)
393 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
394 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
395 if (repmsg->u.link_addr.ports[i].input_port == 0)
396 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
398 if (idx > raw->curlen)
400 if (repmsg->u.link_addr.ports[i].input_port == 0) {
401 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
403 if (idx > raw->curlen)
405 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
407 if (idx > raw->curlen)
409 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
410 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
414 if (idx > raw->curlen)
420 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
424 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
425 struct drm_dp_sideband_msg_reply_body *repmsg)
428 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
430 if (idx > raw->curlen)
432 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
433 if (idx > raw->curlen)
436 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
439 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
443 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
444 struct drm_dp_sideband_msg_reply_body *repmsg)
447 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
449 if (idx > raw->curlen)
453 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
457 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
458 struct drm_dp_sideband_msg_reply_body *repmsg)
462 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
464 if (idx > raw->curlen)
466 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
469 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
472 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
476 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
477 struct drm_dp_sideband_msg_reply_body *repmsg)
480 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
482 if (idx > raw->curlen)
484 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
486 if (idx > raw->curlen)
488 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
490 if (idx > raw->curlen)
494 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
498 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
499 struct drm_dp_sideband_msg_reply_body *repmsg)
502 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
504 if (idx > raw->curlen)
506 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
508 if (idx > raw->curlen)
510 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
512 if (idx > raw->curlen)
516 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
520 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
521 struct drm_dp_sideband_msg_reply_body *repmsg)
524 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
526 if (idx > raw->curlen)
528 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
530 if (idx > raw->curlen)
534 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
538 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
539 struct drm_dp_sideband_msg_reply_body *msg)
541 memset(msg, 0, sizeof(*msg));
542 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
543 msg->req_type = (raw->msg[0] & 0x7f);
545 if (msg->reply_type) {
546 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
547 msg->u.nak.reason = raw->msg[17];
548 msg->u.nak.nak_data = raw->msg[18];
552 switch (msg->req_type) {
553 case DP_LINK_ADDRESS:
554 return drm_dp_sideband_parse_link_address(raw, msg);
555 case DP_QUERY_PAYLOAD:
556 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
557 case DP_REMOTE_DPCD_READ:
558 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
559 case DP_REMOTE_DPCD_WRITE:
560 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
561 case DP_REMOTE_I2C_READ:
562 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
563 case DP_ENUM_PATH_RESOURCES:
564 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
565 case DP_ALLOCATE_PAYLOAD:
566 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
568 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
573 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
574 struct drm_dp_sideband_msg_req_body *msg)
578 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
580 if (idx > raw->curlen)
583 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
585 if (idx > raw->curlen)
588 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
589 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
590 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
591 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
592 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
596 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
600 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
601 struct drm_dp_sideband_msg_req_body *msg)
605 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
607 if (idx > raw->curlen)
610 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
612 if (idx > raw->curlen)
615 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
619 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
623 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
624 struct drm_dp_sideband_msg_req_body *msg)
626 memset(msg, 0, sizeof(*msg));
627 msg->req_type = (raw->msg[0] & 0x7f);
629 switch (msg->req_type) {
630 case DP_CONNECTION_STATUS_NOTIFY:
631 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
632 case DP_RESOURCE_STATUS_NOTIFY:
633 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
635 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
640 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
642 struct drm_dp_sideband_msg_req_body req;
644 req.req_type = DP_REMOTE_DPCD_WRITE;
645 req.u.dpcd_write.port_number = port_num;
646 req.u.dpcd_write.dpcd_address = offset;
647 req.u.dpcd_write.num_bytes = num_bytes;
648 req.u.dpcd_write.bytes = bytes;
649 drm_dp_encode_sideband_req(&req, msg);
654 static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
656 struct drm_dp_sideband_msg_req_body req;
658 req.req_type = DP_LINK_ADDRESS;
659 drm_dp_encode_sideband_req(&req, msg);
663 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
665 struct drm_dp_sideband_msg_req_body req;
667 req.req_type = DP_ENUM_PATH_RESOURCES;
668 req.u.port_num.port_number = port_num;
669 drm_dp_encode_sideband_req(&req, msg);
670 msg->path_msg = true;
674 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
675 u8 vcpi, uint16_t pbn,
676 u8 number_sdp_streams,
679 struct drm_dp_sideband_msg_req_body req;
680 memset(&req, 0, sizeof(req));
681 req.req_type = DP_ALLOCATE_PAYLOAD;
682 req.u.allocate_payload.port_number = port_num;
683 req.u.allocate_payload.vcpi = vcpi;
684 req.u.allocate_payload.pbn = pbn;
685 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
686 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
688 drm_dp_encode_sideband_req(&req, msg);
689 msg->path_msg = true;
693 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
694 struct drm_dp_vcpi *vcpi)
698 mutex_lock(&mgr->payload_lock);
699 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
700 if (ret > mgr->max_payloads) {
702 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
706 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
707 if (vcpi_ret > mgr->max_payloads) {
709 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
713 set_bit(ret, &mgr->payload_mask);
714 set_bit(vcpi_ret, &mgr->vcpi_mask);
715 vcpi->vcpi = vcpi_ret + 1;
716 mgr->proposed_vcpis[ret - 1] = vcpi;
718 mutex_unlock(&mgr->payload_lock);
722 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
729 mutex_lock(&mgr->payload_lock);
730 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
731 clear_bit(vcpi - 1, &mgr->vcpi_mask);
733 for (i = 0; i < mgr->max_payloads; i++) {
734 if (mgr->proposed_vcpis[i])
735 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
736 mgr->proposed_vcpis[i] = NULL;
737 clear_bit(i + 1, &mgr->payload_mask);
740 mutex_unlock(&mgr->payload_lock);
743 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
744 struct drm_dp_sideband_msg_tx *txmsg)
749 * All updates to txmsg->state are protected by mgr->qlock, and the two
750 * cases we check here are terminal states. For those the barriers
751 * provided by the wake_up/wait_event pair are enough.
753 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX ||
754 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT);
758 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
759 struct drm_dp_sideband_msg_tx *txmsg)
761 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
764 ret = wait_event_timeout(mgr->tx_waitq,
765 check_txmsg_state(mgr, txmsg),
767 mutex_lock(&mstb->mgr->qlock);
769 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
774 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
776 /* dump some state */
780 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
781 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
782 list_del(&txmsg->next);
785 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
786 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
787 mstb->tx_slots[txmsg->seqno] = NULL;
791 mutex_unlock(&mgr->qlock);
796 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
798 struct drm_dp_mst_branch *mstb;
800 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
806 memcpy(mstb->rad, rad, lct / 2);
807 INIT_LIST_HEAD(&mstb->ports);
808 kref_init(&mstb->kref);
812 static void drm_dp_free_mst_port(struct kref *kref);
814 static void drm_dp_free_mst_branch_device(struct kref *kref)
816 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
817 if (mstb->port_parent) {
818 if (list_empty(&mstb->port_parent->next))
819 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
824 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
826 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
827 struct drm_dp_mst_port *port, *tmp;
828 bool wake_tx = false;
831 * init kref again to be used by ports to remove mst branch when it is
836 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
837 kref_get(&mstb->port_parent->kref);
840 * destroy all ports - don't need lock
841 * as there are no more references to the mst branch
842 * device at this point.
844 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
845 list_del(&port->next);
846 drm_dp_put_port(port);
849 /* drop any tx slots msg */
850 mutex_lock(&mstb->mgr->qlock);
851 if (mstb->tx_slots[0]) {
852 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
853 mstb->tx_slots[0] = NULL;
856 if (mstb->tx_slots[1]) {
857 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
858 mstb->tx_slots[1] = NULL;
861 mutex_unlock(&mstb->mgr->qlock);
864 wake_up(&mstb->mgr->tx_waitq);
866 kref_put(kref, drm_dp_free_mst_branch_device);
869 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
871 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
875 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
877 struct drm_dp_mst_branch *mstb;
880 case DP_PEER_DEVICE_DP_LEGACY_CONV:
881 case DP_PEER_DEVICE_SST_SINK:
882 /* remove i2c over sideband */
883 drm_dp_mst_unregister_i2c_bus(&port->aux);
885 case DP_PEER_DEVICE_MST_BRANCHING:
888 drm_dp_put_mst_branch_device(mstb);
893 static void drm_dp_destroy_port(struct kref *kref)
895 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
896 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
899 port->vcpi.num_slots = 0;
901 kfree(port->cached_edid);
904 * The only time we don't have a connector
905 * on an output port is if the connector init
908 if (port->connector) {
909 /* we can't destroy the connector here, as
910 * we might be holding the mode_config.mutex
911 * from an EDID retrieval */
913 mutex_lock(&mgr->destroy_connector_lock);
914 kref_get(&port->parent->kref);
915 list_add(&port->next, &mgr->destroy_connector_list);
916 mutex_unlock(&mgr->destroy_connector_lock);
917 schedule_work(&mgr->destroy_connector_work);
920 /* no need to clean up vcpi
921 * as if we have no connector we never setup a vcpi */
922 drm_dp_port_teardown_pdt(port, port->pdt);
923 port->pdt = DP_PEER_DEVICE_NONE;
928 static void drm_dp_put_port(struct drm_dp_mst_port *port)
930 kref_put(&port->kref, drm_dp_destroy_port);
933 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)
935 struct drm_dp_mst_port *port;
936 struct drm_dp_mst_branch *rmstb;
937 if (to_find == mstb) {
938 kref_get(&mstb->kref);
941 list_for_each_entry(port, &mstb->ports, next) {
943 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
951 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)
953 struct drm_dp_mst_branch *rmstb = NULL;
954 mutex_lock(&mgr->lock);
955 if (mgr->mst_primary)
956 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
957 mutex_unlock(&mgr->lock);
961 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)
963 struct drm_dp_mst_port *port, *mport;
965 list_for_each_entry(port, &mstb->ports, next) {
966 if (port == to_find) {
967 kref_get(&port->kref);
971 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
979 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)
981 struct drm_dp_mst_port *rport = NULL;
982 mutex_lock(&mgr->lock);
983 if (mgr->mst_primary)
984 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
985 mutex_unlock(&mgr->lock);
989 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
991 struct drm_dp_mst_port *port;
993 list_for_each_entry(port, &mstb->ports, next) {
994 if (port->port_num == port_num) {
995 kref_get(&port->kref);
1004 * calculate a new RAD for this MST branch device
1005 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1006 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1008 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1011 int parent_lct = port->parent->lct;
1013 int idx = (parent_lct - 1) / 2;
1014 if (parent_lct > 1) {
1015 memcpy(rad, port->parent->rad, idx + 1);
1016 shift = (parent_lct % 2) ? 4 : 0;
1020 rad[idx] |= port->port_num << shift;
1021 return parent_lct + 1;
1025 * return sends link address for new mstb
1027 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1031 bool send_link = false;
1032 switch (port->pdt) {
1033 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1034 case DP_PEER_DEVICE_SST_SINK:
1035 /* add i2c over sideband */
1036 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1038 case DP_PEER_DEVICE_MST_BRANCHING:
1039 lct = drm_dp_calculate_rad(port, rad);
1041 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1042 port->mstb->mgr = port->mgr;
1043 port->mstb->port_parent = port;
1051 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1055 memcpy(mstb->guid, guid, 16);
1057 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1058 if (mstb->port_parent) {
1059 ret = drm_dp_send_dpcd_write(
1067 ret = drm_dp_dpcd_write(
1076 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1079 size_t proppath_size)
1083 ksnprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1084 for (i = 0; i < (mstb->lct - 1); i++) {
1085 int shift = (i % 2) ? 0 : 4;
1086 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1087 ksnprintf(temp, sizeof(temp), "-%d", port_num);
1088 strlcat(proppath, temp, proppath_size);
1090 ksnprintf(temp, sizeof(temp), "-%d", pnum);
1091 strlcat(proppath, temp, proppath_size);
1094 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1095 struct drm_device *dev,
1096 struct drm_dp_link_addr_reply_port *port_msg)
1098 struct drm_dp_mst_port *port;
1100 bool created = false;
1103 port = drm_dp_get_port(mstb, port_msg->port_number);
1105 port = kzalloc(sizeof(*port), GFP_KERNEL);
1108 kref_init(&port->kref);
1109 port->parent = mstb;
1110 port->port_num = port_msg->port_number;
1111 port->mgr = mstb->mgr;
1112 port->aux.name = "DPMST";
1113 port->aux.dev = dev->dev;
1116 old_pdt = port->pdt;
1117 old_ddps = port->ddps;
1120 port->pdt = port_msg->peer_device_type;
1121 port->input = port_msg->input_port;
1122 port->mcs = port_msg->mcs;
1123 port->ddps = port_msg->ddps;
1124 port->ldps = port_msg->legacy_device_plug_status;
1125 port->dpcd_rev = port_msg->dpcd_revision;
1126 port->num_sdp_streams = port_msg->num_sdp_streams;
1127 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1129 /* manage mstb port lists with mgr lock - take a reference
1132 mutex_lock(&mstb->mgr->lock);
1133 kref_get(&port->kref);
1134 list_add(&port->next, &mstb->ports);
1135 mutex_unlock(&mstb->mgr->lock);
1138 if (old_ddps != port->ddps) {
1141 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1143 port->available_pbn = 0;
1147 if (old_pdt != port->pdt && !port->input) {
1148 drm_dp_port_teardown_pdt(port, old_pdt);
1150 ret = drm_dp_port_setup_pdt(port);
1152 drm_dp_send_link_address(mstb->mgr, port->mstb);
1155 if (created && !port->input) {
1158 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1159 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1160 if (!port->connector) {
1161 /* remove it from the port list */
1162 mutex_lock(&mstb->mgr->lock);
1163 list_del(&port->next);
1164 mutex_unlock(&mstb->mgr->lock);
1165 /* drop port list reference */
1166 drm_dp_put_port(port);
1169 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1170 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1171 port->port_num >= DP_MST_LOGICAL_PORT_0) {
1172 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1173 drm_mode_connector_set_tile_property(port->connector);
1175 (*mstb->mgr->cbs->register_connector)(port->connector);
1179 /* put reference to this port */
1180 drm_dp_put_port(port);
1183 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1184 struct drm_dp_connection_status_notify *conn_stat)
1186 struct drm_dp_mst_port *port;
1189 bool dowork = false;
1190 port = drm_dp_get_port(mstb, conn_stat->port_number);
1194 old_ddps = port->ddps;
1195 old_pdt = port->pdt;
1196 port->pdt = conn_stat->peer_device_type;
1197 port->mcs = conn_stat->message_capability_status;
1198 port->ldps = conn_stat->legacy_device_plug_status;
1199 port->ddps = conn_stat->displayport_device_plug_status;
1201 if (old_ddps != port->ddps) {
1205 port->available_pbn = 0;
1208 if (old_pdt != port->pdt && !port->input) {
1209 drm_dp_port_teardown_pdt(port, old_pdt);
1211 if (drm_dp_port_setup_pdt(port))
1215 drm_dp_put_port(port);
1217 queue_work(system_long_wq, &mstb->mgr->work);
1221 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1224 struct drm_dp_mst_branch *mstb;
1225 struct drm_dp_mst_port *port;
1227 /* find the port by iterating down */
1229 mutex_lock(&mgr->lock);
1230 mstb = mgr->mst_primary;
1232 for (i = 0; i < lct - 1; i++) {
1233 int shift = (i % 2) ? 0 : 4;
1234 int port_num = (rad[i / 2] >> shift) & 0xf;
1236 list_for_each_entry(port, &mstb->ports, next) {
1237 if (port->port_num == port_num) {
1240 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1248 kref_get(&mstb->kref);
1250 mutex_unlock(&mgr->lock);
1254 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1255 struct drm_dp_mst_branch *mstb,
1258 struct drm_dp_mst_branch *found_mstb;
1259 struct drm_dp_mst_port *port;
1261 if (memcmp(mstb->guid, guid, 16) == 0)
1265 list_for_each_entry(port, &mstb->ports, next) {
1269 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1278 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1279 struct drm_dp_mst_topology_mgr *mgr,
1282 struct drm_dp_mst_branch *mstb;
1284 /* find the port by iterating down */
1285 mutex_lock(&mgr->lock);
1287 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1290 kref_get(&mstb->kref);
1292 mutex_unlock(&mgr->lock);
1296 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1297 struct drm_dp_mst_branch *mstb)
1299 struct drm_dp_mst_port *port;
1300 struct drm_dp_mst_branch *mstb_child;
1301 if (!mstb->link_address_sent)
1302 drm_dp_send_link_address(mgr, mstb);
1304 list_for_each_entry(port, &mstb->ports, next) {
1311 if (!port->available_pbn)
1312 drm_dp_send_enum_path_resources(mgr, mstb, port);
1315 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1317 drm_dp_check_and_send_link_address(mgr, mstb_child);
1318 drm_dp_put_mst_branch_device(mstb_child);
1324 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1326 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1327 struct drm_dp_mst_branch *mstb;
1329 mutex_lock(&mgr->lock);
1330 mstb = mgr->mst_primary;
1332 kref_get(&mstb->kref);
1334 mutex_unlock(&mgr->lock);
1336 drm_dp_check_and_send_link_address(mgr, mstb);
1337 drm_dp_put_mst_branch_device(mstb);
1341 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1344 static u8 zero_guid[16];
1346 if (!memcmp(guid, zero_guid, 16)) {
1347 u64 salt = get_jiffies_64();
1348 memcpy(&guid[0], &salt, sizeof(u64));
1349 memcpy(&guid[8], &salt, sizeof(u64));
1356 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1358 struct drm_dp_sideband_msg_req_body req;
1360 req.req_type = DP_REMOTE_DPCD_READ;
1361 req.u.dpcd_read.port_number = port_num;
1362 req.u.dpcd_read.dpcd_address = offset;
1363 req.u.dpcd_read.num_bytes = num_bytes;
1364 drm_dp_encode_sideband_req(&req, msg);
1370 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1371 bool up, u8 *msg, int len)
1374 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1375 int tosend, total, offset;
1382 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1384 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1387 if (ret != tosend) {
1388 if (ret == -EIO && retries < 5) {
1392 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1398 } while (total > 0);
1402 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1403 struct drm_dp_sideband_msg_tx *txmsg)
1405 struct drm_dp_mst_branch *mstb = txmsg->dst;
1408 /* both msg slots are full */
1409 if (txmsg->seqno == -1) {
1410 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1411 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1414 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1415 txmsg->seqno = mstb->last_seqno;
1416 mstb->last_seqno ^= 1;
1417 } else if (mstb->tx_slots[0] == NULL)
1421 mstb->tx_slots[txmsg->seqno] = txmsg;
1424 req_type = txmsg->msg[0] & 0x7f;
1425 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1426 req_type == DP_RESOURCE_STATUS_NOTIFY)
1430 hdr->path_msg = txmsg->path_msg;
1431 hdr->lct = mstb->lct;
1432 hdr->lcr = mstb->lct - 1;
1434 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1435 hdr->seqno = txmsg->seqno;
1439 * process a single block of the next message in the sideband queue
1441 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1442 struct drm_dp_sideband_msg_tx *txmsg,
1446 struct drm_dp_sideband_msg_hdr hdr;
1447 int len, space, idx, tosend;
1450 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1452 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1454 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1457 /* make hdr from dst mst - for replies use seqno
1458 otherwise assign one */
1459 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1463 /* amount left to send in this message */
1464 len = txmsg->cur_len - txmsg->cur_offset;
1466 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1467 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1469 tosend = min(len, space);
1470 if (len == txmsg->cur_len)
1476 hdr.msg_len = tosend + 1;
1477 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1478 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1479 /* add crc at end */
1480 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1483 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1485 DRM_DEBUG_KMS("sideband msg failed to send\n");
1489 txmsg->cur_offset += tosend;
1490 if (txmsg->cur_offset == txmsg->cur_len) {
1491 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1497 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1499 struct drm_dp_sideband_msg_tx *txmsg;
1502 WARN_ON(!mutex_is_locked(&mgr->qlock));
1504 /* construct a chunk from the first msg in the tx_msg queue */
1505 if (list_empty(&mgr->tx_msg_downq))
1508 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1509 ret = process_single_tx_qlock(mgr, txmsg, false);
1511 /* txmsg is sent it should be in the slots now */
1512 list_del(&txmsg->next);
1514 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1515 list_del(&txmsg->next);
1516 if (txmsg->seqno != -1)
1517 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1518 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1519 wake_up(&mgr->tx_waitq);
1523 /* called holding qlock */
1524 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1525 struct drm_dp_sideband_msg_tx *txmsg)
1529 /* construct a chunk from the first msg in the tx_msg queue */
1530 ret = process_single_tx_qlock(mgr, txmsg, true);
1533 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1535 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1538 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1539 struct drm_dp_sideband_msg_tx *txmsg)
1541 mutex_lock(&mgr->qlock);
1542 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1543 if (list_is_singular(&mgr->tx_msg_downq))
1544 process_single_down_tx_qlock(mgr);
1545 mutex_unlock(&mgr->qlock);
1548 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1549 struct drm_dp_mst_branch *mstb)
1552 struct drm_dp_sideband_msg_tx *txmsg;
1555 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1560 len = build_link_address(txmsg);
1562 mstb->link_address_sent = true;
1563 drm_dp_queue_down_tx(mgr, txmsg);
1565 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1569 if (txmsg->reply.reply_type == 1)
1570 DRM_DEBUG_KMS("link address nak received\n");
1572 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1573 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1574 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,
1575 txmsg->reply.u.link_addr.ports[i].input_port,
1576 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1577 txmsg->reply.u.link_addr.ports[i].port_number,
1578 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1579 txmsg->reply.u.link_addr.ports[i].mcs,
1580 txmsg->reply.u.link_addr.ports[i].ddps,
1581 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1582 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1583 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1586 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1588 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1589 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1591 (*mgr->cbs->hotplug)(mgr);
1594 mstb->link_address_sent = false;
1595 DRM_DEBUG_KMS("link address failed %d\n", ret);
1601 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1602 struct drm_dp_mst_branch *mstb,
1603 struct drm_dp_mst_port *port)
1606 struct drm_dp_sideband_msg_tx *txmsg;
1609 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1614 len = build_enum_path_resources(txmsg, port->port_num);
1616 drm_dp_queue_down_tx(mgr, txmsg);
1618 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1620 if (txmsg->reply.reply_type == 1)
1621 DRM_DEBUG_KMS("enum path resources nak received\n");
1623 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1624 DRM_ERROR("got incorrect port in response\n");
1625 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,
1626 txmsg->reply.u.path_resources.avail_payload_bw_number);
1627 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1635 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1637 if (!mstb->port_parent)
1640 if (mstb->port_parent->mstb != mstb)
1641 return mstb->port_parent;
1643 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1646 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1647 struct drm_dp_mst_branch *mstb,
1650 struct drm_dp_mst_branch *rmstb = NULL;
1651 struct drm_dp_mst_port *found_port;
1652 mutex_lock(&mgr->lock);
1653 if (mgr->mst_primary) {
1654 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1657 rmstb = found_port->parent;
1658 kref_get(&rmstb->kref);
1659 *port_num = found_port->port_num;
1662 mutex_unlock(&mgr->lock);
1666 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1667 struct drm_dp_mst_port *port,
1671 struct drm_dp_sideband_msg_tx *txmsg;
1672 struct drm_dp_mst_branch *mstb;
1673 int len, ret, port_num;
1674 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1677 port = drm_dp_get_validated_port_ref(mgr, port);
1681 port_num = port->port_num;
1682 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1684 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1687 drm_dp_put_port(port);
1692 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1698 for (i = 0; i < port->num_sdp_streams; i++)
1702 len = build_allocate_payload(txmsg, port_num,
1704 pbn, port->num_sdp_streams, sinks);
1706 drm_dp_queue_down_tx(mgr, txmsg);
1708 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1710 if (txmsg->reply.reply_type == 1) {
1717 drm_dp_put_mst_branch_device(mstb);
1718 drm_dp_put_port(port);
1722 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1724 struct drm_dp_payload *payload)
1728 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1730 payload->payload_state = 0;
1733 payload->payload_state = DP_PAYLOAD_LOCAL;
1737 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1738 struct drm_dp_mst_port *port,
1740 struct drm_dp_payload *payload)
1743 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1746 payload->payload_state = DP_PAYLOAD_REMOTE;
1750 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1751 struct drm_dp_mst_port *port,
1753 struct drm_dp_payload *payload)
1755 DRM_DEBUG_KMS("\n");
1756 /* its okay for these to fail */
1758 drm_dp_payload_send_msg(mgr, port, id, 0);
1761 drm_dp_dpcd_write_payload(mgr, id, payload);
1762 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1766 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1768 struct drm_dp_payload *payload)
1770 payload->payload_state = 0;
1775 * drm_dp_update_payload_part1() - Execute payload update part 1
1776 * @mgr: manager to use.
1778 * This iterates over all proposed virtual channels, and tries to
1779 * allocate space in the link for them. For 0->slots transitions,
1780 * this step just writes the VCPI to the MST device. For slots->0
1781 * transitions, this writes the updated VCPIs and removes the
1782 * remote VC payloads.
1784 * after calling this the driver should generate ACT and payload
1787 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1791 struct drm_dp_payload req_payload;
1792 struct drm_dp_mst_port *port;
1794 mutex_lock(&mgr->payload_lock);
1795 for (i = 0; i < mgr->max_payloads; i++) {
1796 /* solve the current payloads - compare to the hw ones
1797 - update the hw view */
1798 req_payload.start_slot = cur_slots;
1799 if (mgr->proposed_vcpis[i]) {
1800 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1801 port = drm_dp_get_validated_port_ref(mgr, port);
1803 mutex_unlock(&mgr->payload_lock);
1806 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1807 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1810 req_payload.num_slots = 0;
1813 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1814 mgr->payloads[i].start_slot = req_payload.start_slot;
1816 /* work out what is required to happen with this payload */
1817 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1819 /* need to push an update for this payload */
1820 if (req_payload.num_slots) {
1821 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1822 mgr->payloads[i].num_slots = req_payload.num_slots;
1823 mgr->payloads[i].vcpi = req_payload.vcpi;
1824 } else if (mgr->payloads[i].num_slots) {
1825 mgr->payloads[i].num_slots = 0;
1826 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1827 req_payload.payload_state = mgr->payloads[i].payload_state;
1828 mgr->payloads[i].start_slot = 0;
1830 mgr->payloads[i].payload_state = req_payload.payload_state;
1832 cur_slots += req_payload.num_slots;
1835 drm_dp_put_port(port);
1838 for (i = 0; i < mgr->max_payloads; i++) {
1839 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1840 DRM_DEBUG_KMS("removing payload %d\n", i);
1841 for (j = i; j < mgr->max_payloads - 1; j++) {
1842 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1843 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1844 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1845 set_bit(j + 1, &mgr->payload_mask);
1847 clear_bit(j + 1, &mgr->payload_mask);
1850 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1851 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1852 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1856 mutex_unlock(&mgr->payload_lock);
1860 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1863 * drm_dp_update_payload_part2() - Execute payload update part 2
1864 * @mgr: manager to use.
1866 * This iterates over all proposed virtual channels, and tries to
1867 * allocate space in the link for them. For 0->slots transitions,
1868 * this step writes the remote VC payload commands. For slots->0
1869 * this just resets some internal state.
1871 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1873 struct drm_dp_mst_port *port;
1876 mutex_lock(&mgr->payload_lock);
1877 for (i = 0; i < mgr->max_payloads; i++) {
1879 if (!mgr->proposed_vcpis[i])
1882 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1884 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1885 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1886 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1887 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1888 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1891 mutex_unlock(&mgr->payload_lock);
1895 mutex_unlock(&mgr->payload_lock);
1898 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1900 #if 0 /* unused as of yet */
1901 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1902 struct drm_dp_mst_port *port,
1903 int offset, int size)
1906 struct drm_dp_sideband_msg_tx *txmsg;
1908 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1912 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1913 txmsg->dst = port->parent;
1915 drm_dp_queue_down_tx(mgr, txmsg);
1921 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1922 struct drm_dp_mst_port *port,
1923 int offset, int size, u8 *bytes)
1927 struct drm_dp_sideband_msg_tx *txmsg;
1928 struct drm_dp_mst_branch *mstb;
1930 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1934 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1940 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1943 drm_dp_queue_down_tx(mgr, txmsg);
1945 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1947 if (txmsg->reply.reply_type == 1) {
1954 drm_dp_put_mst_branch_device(mstb);
1958 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1960 struct drm_dp_sideband_msg_reply_body reply;
1962 reply.reply_type = 0;
1963 reply.req_type = req_type;
1964 drm_dp_encode_sideband_reply(&reply, msg);
1968 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1969 struct drm_dp_mst_branch *mstb,
1970 int req_type, int seqno, bool broadcast)
1972 struct drm_dp_sideband_msg_tx *txmsg;
1974 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1979 txmsg->seqno = seqno;
1980 drm_dp_encode_up_ack_reply(txmsg, req_type);
1982 mutex_lock(&mgr->qlock);
1984 process_single_up_tx_qlock(mgr, txmsg);
1986 mutex_unlock(&mgr->qlock);
1992 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
1996 switch (dp_link_bw) {
1998 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1999 dp_link_bw, dp_link_count);
2002 case DP_LINK_BW_1_62:
2003 *out = 3 * dp_link_count;
2005 case DP_LINK_BW_2_7:
2006 *out = 5 * dp_link_count;
2008 case DP_LINK_BW_5_4:
2009 *out = 10 * dp_link_count;
2016 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2017 * @mgr: manager to set state for
2018 * @mst_state: true to enable MST on this connector - false to disable.
2020 * This is called by the driver when it detects an MST capable device plugged
2021 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2023 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2026 struct drm_dp_mst_branch *mstb = NULL;
2028 mutex_lock(&mgr->lock);
2029 if (mst_state == mgr->mst_state)
2032 mgr->mst_state = mst_state;
2033 /* set the device into MST mode */
2035 WARN_ON(mgr->mst_primary);
2038 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2039 if (ret != DP_RECEIVER_CAP_SIZE) {
2040 DRM_DEBUG_KMS("failed to read DPCD\n");
2044 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2045 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2051 /* add initial branch device at LCT 1 */
2052 mstb = drm_dp_add_mst_branch_device(1, NULL);
2059 /* give this the main reference */
2060 mgr->mst_primary = mstb;
2061 kref_get(&mgr->mst_primary->kref);
2063 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2064 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2070 struct drm_dp_payload reset_pay;
2071 reset_pay.start_slot = 0;
2072 reset_pay.num_slots = 0x3f;
2073 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2076 queue_work(system_long_wq, &mgr->work);
2080 /* disable MST on the device */
2081 mstb = mgr->mst_primary;
2082 mgr->mst_primary = NULL;
2083 /* this can fail if the device is gone */
2084 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2086 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2087 mgr->payload_mask = 0;
2088 set_bit(0, &mgr->payload_mask);
2093 mutex_unlock(&mgr->lock);
2095 drm_dp_put_mst_branch_device(mstb);
2099 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2102 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2103 * @mgr: manager to suspend
2105 * This function tells the MST device that we can't handle UP messages
2106 * anymore. This should stop it from sending any since we are suspended.
2108 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2110 mutex_lock(&mgr->lock);
2111 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2112 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2113 mutex_unlock(&mgr->lock);
2114 flush_work(&mgr->work);
2115 flush_work(&mgr->destroy_connector_work);
2117 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2120 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2121 * @mgr: manager to resume
2123 * This will fetch DPCD and see if the device is still there,
2124 * if it is, it will rewrite the MSTM control bits, and return.
2126 * if the device fails this returns -1, and the driver should do
2127 * a full MST reprobe, in case we were undocked.
2129 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2133 mutex_lock(&mgr->lock);
2135 if (mgr->mst_primary) {
2139 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2140 if (sret != DP_RECEIVER_CAP_SIZE) {
2141 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2146 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2147 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2149 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2154 /* Some hubs forget their guids after they resume */
2155 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2157 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2161 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2168 mutex_unlock(&mgr->lock);
2171 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2173 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2177 int replylen, origlen, curreply;
2179 struct drm_dp_sideband_msg_rx *msg;
2180 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2181 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2183 len = min(mgr->max_dpcd_transaction_bytes, 16);
2184 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2187 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2190 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2192 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2195 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2200 while (replylen > 0) {
2201 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2202 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2205 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
2210 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2212 DRM_DEBUG_KMS("failed to build sideband msg\n");
2222 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2226 if (!drm_dp_get_one_sb_msg(mgr, false)) {
2227 memset(&mgr->down_rep_recv, 0,
2228 sizeof(struct drm_dp_sideband_msg_rx));
2232 if (mgr->down_rep_recv.have_eomt) {
2233 struct drm_dp_sideband_msg_tx *txmsg;
2234 struct drm_dp_mst_branch *mstb;
2236 mstb = drm_dp_get_mst_branch_device(mgr,
2237 mgr->down_rep_recv.initial_hdr.lct,
2238 mgr->down_rep_recv.initial_hdr.rad);
2241 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2242 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2246 /* find the message */
2247 slot = mgr->down_rep_recv.initial_hdr.seqno;
2248 mutex_lock(&mgr->qlock);
2249 txmsg = mstb->tx_slots[slot];
2250 /* remove from slots */
2251 mutex_unlock(&mgr->qlock);
2254 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2256 mgr->down_rep_recv.initial_hdr.seqno,
2257 mgr->down_rep_recv.initial_hdr.lct,
2258 mgr->down_rep_recv.initial_hdr.rad[0],
2259 mgr->down_rep_recv.msg[0]);
2260 drm_dp_put_mst_branch_device(mstb);
2261 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2265 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2266 if (txmsg->reply.reply_type == 1) {
2267 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);
2270 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2271 drm_dp_put_mst_branch_device(mstb);
2273 mutex_lock(&mgr->qlock);
2274 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2275 mstb->tx_slots[slot] = NULL;
2276 mutex_unlock(&mgr->qlock);
2278 wake_up(&mgr->tx_waitq);
2283 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2287 if (!drm_dp_get_one_sb_msg(mgr, true)) {
2288 memset(&mgr->up_req_recv, 0,
2289 sizeof(struct drm_dp_sideband_msg_rx));
2293 if (mgr->up_req_recv.have_eomt) {
2294 struct drm_dp_sideband_msg_req_body msg;
2295 struct drm_dp_mst_branch *mstb = NULL;
2298 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2299 mstb = drm_dp_get_mst_branch_device(mgr,
2300 mgr->up_req_recv.initial_hdr.lct,
2301 mgr->up_req_recv.initial_hdr.rad);
2303 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2304 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2309 seqno = mgr->up_req_recv.initial_hdr.seqno;
2310 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2312 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2313 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2316 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2319 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2320 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2324 drm_dp_update_port(mstb, &msg.u.conn_stat);
2326 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);
2327 (*mgr->cbs->hotplug)(mgr);
2329 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2330 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2332 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2335 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2336 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2340 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2344 drm_dp_put_mst_branch_device(mstb);
2346 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2352 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2353 * @mgr: manager to notify irq for.
2354 * @esi: 4 bytes from SINK_COUNT_ESI
2355 * @handled: whether the hpd interrupt was consumed or not
2357 * This should be called from the driver when it detects a short IRQ,
2358 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2359 * topology manager will process the sideband messages received as a result
2362 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2369 if (sc != mgr->sink_count) {
2370 mgr->sink_count = sc;
2374 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2375 ret = drm_dp_mst_handle_down_rep(mgr);
2379 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2380 ret |= drm_dp_mst_handle_up_req(mgr);
2384 drm_dp_mst_kick_tx(mgr);
2387 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2390 * drm_dp_mst_detect_port() - get connection status for an MST port
2391 * @connector: DRM connector for this port
2392 * @mgr: manager for this port
2393 * @port: unverified pointer to a port
2395 * This returns the current connection state for a port. It validates the
2396 * port pointer still exists so the caller doesn't require a reference
2398 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2399 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2401 enum drm_connector_status status = connector_status_disconnected;
2403 /* we need to search for the port in the mgr in case its gone */
2404 port = drm_dp_get_validated_port_ref(mgr, port);
2406 return connector_status_disconnected;
2411 switch (port->pdt) {
2412 case DP_PEER_DEVICE_NONE:
2413 case DP_PEER_DEVICE_MST_BRANCHING:
2416 case DP_PEER_DEVICE_SST_SINK:
2417 status = connector_status_connected;
2418 /* for logical ports - cache the EDID */
2419 if (port->port_num >= 8 && !port->cached_edid) {
2420 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2423 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2425 status = connector_status_connected;
2429 drm_dp_put_port(port);
2432 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2435 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2436 * @mgr: manager for this port
2437 * @port: unverified pointer to a port.
2439 * This returns whether the port supports audio or not.
2441 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2442 struct drm_dp_mst_port *port)
2446 port = drm_dp_get_validated_port_ref(mgr, port);
2449 ret = port->has_audio;
2450 drm_dp_put_port(port);
2453 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2456 * drm_dp_mst_get_edid() - get EDID for an MST port
2457 * @connector: toplevel connector to get EDID for
2458 * @mgr: manager for this port
2459 * @port: unverified pointer to a port.
2461 * This returns an EDID for the port connected to a connector,
2462 * It validates the pointer still exists so the caller doesn't require a
2465 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2467 struct edid *edid = NULL;
2469 /* we need to search for the port in the mgr in case its gone */
2470 port = drm_dp_get_validated_port_ref(mgr, port);
2474 if (port->cached_edid)
2475 edid = drm_edid_duplicate(port->cached_edid);
2477 edid = drm_get_edid(connector, &port->aux.ddc);
2478 drm_mode_connector_set_tile_property(connector);
2480 port->has_audio = drm_detect_monitor_audio(edid);
2481 drm_dp_put_port(port);
2484 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2487 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2488 * @mgr: manager to use
2489 * @pbn: payload bandwidth to convert into slots.
2491 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2496 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2498 /* max. time slots - one slot for MTP header */
2503 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2505 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2506 struct drm_dp_vcpi *vcpi, int pbn, int slots)
2510 /* max. time slots - one slot for MTP header */
2515 vcpi->aligned_pbn = slots * mgr->pbn_div;
2516 vcpi->num_slots = slots;
2518 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2525 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2526 * @mgr: manager for this port
2527 * @port: port to allocate a virtual channel for.
2528 * @pbn: payload bandwidth number to request
2529 * @slots: returned number of slots for this PBN.
2531 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2532 struct drm_dp_mst_port *port, int pbn, int slots)
2536 port = drm_dp_get_validated_port_ref(mgr, port);
2543 if (port->vcpi.vcpi > 0) {
2544 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2545 if (pbn == port->vcpi.pbn) {
2546 drm_dp_put_port(port);
2551 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
2553 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2554 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
2557 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2558 pbn, port->vcpi.num_slots);
2560 drm_dp_put_port(port);
2565 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2567 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2570 port = drm_dp_get_validated_port_ref(mgr, port);
2574 slots = port->vcpi.num_slots;
2575 drm_dp_put_port(port);
2578 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2581 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2582 * @mgr: manager for this port
2583 * @port: unverified pointer to a port.
2585 * This just resets the number of slots for the ports VCPI for later programming.
2587 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2589 port = drm_dp_get_validated_port_ref(mgr, port);
2592 port->vcpi.num_slots = 0;
2593 drm_dp_put_port(port);
2595 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2598 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2599 * @mgr: manager for this port
2600 * @port: unverified port to deallocate vcpi for
2602 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2604 port = drm_dp_get_validated_port_ref(mgr, port);
2608 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2609 port->vcpi.num_slots = 0;
2611 port->vcpi.aligned_pbn = 0;
2612 port->vcpi.vcpi = 0;
2613 drm_dp_put_port(port);
2615 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2617 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2618 int id, struct drm_dp_payload *payload)
2620 u8 payload_alloc[3], status;
2624 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2625 DP_PAYLOAD_TABLE_UPDATED);
2627 payload_alloc[0] = id;
2628 payload_alloc[1] = payload->start_slot;
2629 payload_alloc[2] = payload->num_slots;
2631 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2633 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2638 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2640 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2644 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2647 usleep_range(10000, 20000);
2650 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2661 * drm_dp_check_act_status() - Check ACT handled status.
2662 * @mgr: manager to use
2664 * Check the payload status bits in the DPCD for ACT handled completion.
2666 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2673 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2676 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2680 if (status & DP_PAYLOAD_ACT_HANDLED)
2685 } while (count < 30);
2687 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2688 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2696 EXPORT_SYMBOL(drm_dp_check_act_status);
2699 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2700 * @clock: dot clock for the mode
2701 * @bpp: bpp for the mode.
2703 * This uses the formula in the spec to calculate the PBN value for a mode.
2705 int drm_dp_calc_pbn_mode(int clock, int bpp)
2715 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2716 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2717 * common multiplier to render an integer PBN for all link rate/lane
2718 * counts combinations
2720 * peak_kbps *= (1006/1000)
2721 * peak_kbps *= (64/54)
2722 * peak_kbps *= 8 convert to bytes
2725 numerator = 64 * 1006;
2726 denominator = 54 * 8 * 1000 * 1000;
2729 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2731 return drm_fixp2int_ceil(peak_kbps);
2733 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2735 static int test_calc_pbn_mode(void)
2738 ret = drm_dp_calc_pbn_mode(154000, 30);
2740 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2741 154000, 30, 689, ret);
2744 ret = drm_dp_calc_pbn_mode(234000, 30);
2746 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2747 234000, 30, 1047, ret);
2750 ret = drm_dp_calc_pbn_mode(297000, 24);
2752 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2753 297000, 24, 1063, ret);
2759 /* we want to kick the TX after we've ack the up/down IRQs. */
2760 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2762 queue_work(system_long_wq, &mgr->tx_work);
2765 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2766 struct drm_dp_mst_branch *mstb)
2768 struct drm_dp_mst_port *port;
2769 int tabs = mstb->lct;
2773 for (i = 0; i < tabs; i++)
2777 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2778 list_for_each_entry(port, &mstb->ports, next) {
2779 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);
2781 drm_dp_mst_dump_mstb(m, port->mstb);
2785 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2790 for (i = 0; i < 4; i++) {
2791 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
2800 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2801 struct drm_dp_mst_port *port, char *name,
2804 struct edid *mst_edid;
2806 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2807 drm_edid_get_monitor_name(mst_edid, name, namelen);
2811 * drm_dp_mst_dump_topology(): dump topology to seq file.
2812 * @m: seq_file to dump output to
2813 * @mgr: manager to dump current topology for.
2815 * helper to dump MST topology to a seq file for debugfs.
2817 void drm_dp_mst_dump_topology(struct seq_file *m,
2818 struct drm_dp_mst_topology_mgr *mgr)
2821 struct drm_dp_mst_port *port;
2823 mutex_lock(&mgr->lock);
2824 if (mgr->mst_primary)
2825 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2828 mutex_unlock(&mgr->lock);
2830 mutex_lock(&mgr->payload_lock);
2831 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2834 for (i = 0; i < mgr->max_payloads; i++) {
2835 if (mgr->proposed_vcpis[i]) {
2838 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2839 fetch_monitor_name(mgr, port, name, sizeof(name));
2840 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2841 port->port_num, port->vcpi.vcpi,
2842 port->vcpi.num_slots,
2843 (*name != 0) ? name : "Unknown");
2845 seq_printf(m, "vcpi %d:unused\n", i);
2847 for (i = 0; i < mgr->max_payloads; i++) {
2848 seq_printf(m, "payload %d: %d, %d, %d\n",
2850 mgr->payloads[i].payload_state,
2851 mgr->payloads[i].start_slot,
2852 mgr->payloads[i].num_slots);
2856 mutex_unlock(&mgr->payload_lock);
2858 mutex_lock(&mgr->lock);
2859 if (mgr->mst_primary) {
2863 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2864 seq_printf(m, "dpcd: ");
2865 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
2866 seq_printf(m, "%02x ", buf[i]);
2867 seq_printf(m, "\n");
2868 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2869 seq_printf(m, "faux/mst: ");
2870 for (i = 0; i < 2; i++)
2871 seq_printf(m, "%02x ", buf[i]);
2872 seq_printf(m, "\n");
2873 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2874 seq_printf(m, "mst ctrl: ");
2875 for (i = 0; i < 1; i++)
2876 seq_printf(m, "%02x ", buf[i]);
2877 seq_printf(m, "\n");
2879 /* dump the standard OUI branch header */
2880 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2881 seq_printf(m, "branch oui: ");
2882 for (i = 0; i < 0x3; i++)
2883 seq_printf(m, "%02x", buf[i]);
2884 seq_printf(m, " devid: ");
2885 for (i = 0x3; i < 0x8 && buf[i]; i++)
2886 seq_printf(m, "%c", buf[i]);
2888 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2889 seq_printf(m, "\n");
2890 bret = dump_dp_payload_table(mgr, buf);
2892 seq_printf(m, "payload table: ");
2893 for (i = 0; i < 63; i++)
2894 seq_printf(m, "%02x ", buf[i]);
2895 seq_printf(m, "\n");
2900 mutex_unlock(&mgr->lock);
2903 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2905 static void drm_dp_tx_work(struct work_struct *work)
2907 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2909 mutex_lock(&mgr->qlock);
2910 if (!list_empty(&mgr->tx_msg_downq))
2911 process_single_down_tx_qlock(mgr);
2912 mutex_unlock(&mgr->qlock);
2915 static void drm_dp_free_mst_port(struct kref *kref)
2917 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2918 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2922 static void drm_dp_destroy_connector_work(struct work_struct *work)
2924 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
2925 struct drm_dp_mst_port *port;
2926 bool send_hotplug = false;
2928 * Not a regular list traverse as we have to drop the destroy
2929 * connector lock before destroying the connector, to avoid AB->BA
2930 * ordering between this lock and the config mutex.
2933 mutex_lock(&mgr->destroy_connector_lock);
2934 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2936 mutex_unlock(&mgr->destroy_connector_lock);
2939 list_del(&port->next);
2940 mutex_unlock(&mgr->destroy_connector_lock);
2942 kref_init(&port->kref);
2943 INIT_LIST_HEAD(&port->next);
2945 mgr->cbs->destroy_connector(mgr, port->connector);
2947 drm_dp_port_teardown_pdt(port, port->pdt);
2948 port->pdt = DP_PEER_DEVICE_NONE;
2950 if (!port->input && port->vcpi.vcpi > 0) {
2951 drm_dp_mst_reset_vcpi_slots(mgr, port);
2952 drm_dp_update_payload_part1(mgr);
2953 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2956 kref_put(&port->kref, drm_dp_free_mst_port);
2957 send_hotplug = true;
2960 (*mgr->cbs->hotplug)(mgr);
2964 * drm_dp_mst_topology_mgr_init - initialise a topology manager
2965 * @mgr: manager struct to initialise
2966 * @dev: device providing this structure - for i2c addition.
2967 * @aux: DP helper aux channel to talk to this device
2968 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
2969 * @max_payloads: maximum number of payloads this GPU can source
2970 * @conn_base_id: the connector object ID the MST device is connected to.
2972 * Return 0 for success, or negative error code on failure
2974 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
2975 struct drm_device *dev, struct drm_dp_aux *aux,
2976 int max_dpcd_transaction_bytes,
2977 int max_payloads, int conn_base_id)
2979 lockinit(&mgr->lock, "drmml", 0, LK_CANRECURSE);
2980 lockinit(&mgr->qlock, "drmmql", 0, LK_CANRECURSE);
2981 lockinit(&mgr->payload_lock, "drmmpl", 0, LK_CANRECURSE);
2982 lockinit(&mgr->destroy_connector_lock, "drmmdcl", 0, LK_CANRECURSE);
2983 INIT_LIST_HEAD(&mgr->tx_msg_downq);
2984 INIT_LIST_HEAD(&mgr->destroy_connector_list);
2985 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
2986 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
2987 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
2988 init_waitqueue_head(&mgr->tx_waitq);
2991 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
2992 mgr->max_payloads = max_payloads;
2993 mgr->conn_base_id = conn_base_id;
2994 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
2995 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
2997 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3000 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3001 if (!mgr->proposed_vcpis)
3003 set_bit(0, &mgr->payload_mask);
3004 if (test_calc_pbn_mode() < 0)
3005 DRM_ERROR("MST PBN self-test failed\n");
3009 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3012 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3013 * @mgr: manager to destroy
3015 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3017 flush_work(&mgr->work);
3018 flush_work(&mgr->destroy_connector_work);
3019 mutex_lock(&mgr->payload_lock);
3020 kfree(mgr->payloads);
3021 mgr->payloads = NULL;
3022 kfree(mgr->proposed_vcpis);
3023 mgr->proposed_vcpis = NULL;
3024 mutex_unlock(&mgr->payload_lock);
3028 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3031 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3034 struct drm_dp_aux *aux = adapter->algo_data;
3035 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3036 struct drm_dp_mst_branch *mstb;
3037 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3039 bool reading = false;
3040 struct drm_dp_sideband_msg_req_body msg;
3041 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3044 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3048 /* construct i2c msg */
3049 /* see if last msg is a read */
3050 if (msgs[num - 1].flags & I2C_M_RD)
3053 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3054 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3059 memset(&msg, 0, sizeof(msg));
3060 msg.req_type = DP_REMOTE_I2C_READ;
3061 msg.u.i2c_read.num_transactions = num - 1;
3062 msg.u.i2c_read.port_number = port->port_num;
3063 for (i = 0; i < num - 1; i++) {
3064 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3065 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3066 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3068 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3069 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3071 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3078 drm_dp_encode_sideband_req(&msg, txmsg);
3080 drm_dp_queue_down_tx(mgr, txmsg);
3082 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3085 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3089 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3093 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3098 drm_dp_put_mst_branch_device(mstb);
3102 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3104 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3105 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3106 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3107 I2C_FUNC_10BIT_ADDR;
3110 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3111 .functionality = drm_dp_mst_i2c_functionality,
3112 .master_xfer = drm_dp_mst_i2c_xfer,
3116 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3117 * @aux: DisplayPort AUX channel
3119 * Returns 0 on success or a negative error code on failure.
3121 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3123 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3124 aux->ddc.algo_data = aux;
3125 aux->ddc.retries = 3;
3128 aux->ddc.class = I2C_CLASS_DDC;
3129 aux->ddc.owner = THIS_MODULE;
3131 aux->ddc.dev.parent = aux->dev;
3133 aux->ddc.dev.of_node = aux->dev->of_node;
3136 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3137 sizeof(aux->ddc.name));
3139 return i2c_add_adapter(&aux->ddc);
3143 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3144 * @aux: DisplayPort AUX channel
3146 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3148 i2c_del_adapter(&aux->ddc);