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/init.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/seq_file.h>
29 #include <linux/i2c.h>
30 #include <drm/drm_dp_mst_helper.h>
33 #include <drm/drm_fixed.h>
34 #include <drm/drm_atomic.h>
35 #include <drm/drm_atomic_helper.h>
40 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
41 * protocol. The helpers contain a topology manager and bandwidth manager.
42 * The helpers encapsulate the sending and received of sideband msgs.
44 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
46 static int test_calc_pbn_mode(void);
48 static void drm_dp_put_port(struct drm_dp_mst_port *port);
50 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
52 struct drm_dp_payload *payload);
54 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
55 struct drm_dp_mst_port *port,
56 int offset, int size, u8 *bytes);
58 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
59 struct drm_dp_mst_branch *mstb);
60 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
61 struct drm_dp_mst_branch *mstb,
62 struct drm_dp_mst_port *port);
63 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
66 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
67 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
68 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
69 /* sideband msg handling */
70 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
75 int number_of_bits = num_nibbles * 4;
78 while (number_of_bits != 0) {
81 remainder |= (data[array_index] & bitmask) >> bitshift;
89 if ((remainder & 0x10) == 0x10)
94 while (number_of_bits != 0) {
97 if ((remainder & 0x10) != 0)
104 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
109 int number_of_bits = number_of_bytes * 8;
112 while (number_of_bits != 0) {
115 remainder |= (data[array_index] & bitmask) >> bitshift;
123 if ((remainder & 0x100) == 0x100)
128 while (number_of_bits != 0) {
131 if ((remainder & 0x100) != 0)
135 return remainder & 0xff;
137 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
140 size += (hdr->lct / 2);
144 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
150 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
151 for (i = 0; i < (hdr->lct / 2); i++)
152 buf[idx++] = hdr->rad[i];
153 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
154 (hdr->msg_len & 0x3f);
155 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
157 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
158 buf[idx - 1] |= (crc4 & 0xf);
163 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
164 u8 *buf, int buflen, u8 *hdrlen)
173 len += ((buf[0] & 0xf0) >> 4) / 2;
176 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
178 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
179 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
183 hdr->lct = (buf[0] & 0xf0) >> 4;
184 hdr->lcr = (buf[0] & 0xf);
186 for (i = 0; i < (hdr->lct / 2); i++)
187 hdr->rad[i] = buf[idx++];
188 hdr->broadcast = (buf[idx] >> 7) & 0x1;
189 hdr->path_msg = (buf[idx] >> 6) & 0x1;
190 hdr->msg_len = buf[idx] & 0x3f;
192 hdr->somt = (buf[idx] >> 7) & 0x1;
193 hdr->eomt = (buf[idx] >> 6) & 0x1;
194 hdr->seqno = (buf[idx] >> 4) & 0x1;
200 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
201 struct drm_dp_sideband_msg_tx *raw)
206 buf[idx++] = req->req_type & 0x7f;
208 switch (req->req_type) {
209 case DP_ENUM_PATH_RESOURCES:
210 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
213 case DP_ALLOCATE_PAYLOAD:
214 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
215 (req->u.allocate_payload.number_sdp_streams & 0xf);
217 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
219 buf[idx] = (req->u.allocate_payload.pbn >> 8);
221 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
223 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
224 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
225 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
228 if (req->u.allocate_payload.number_sdp_streams & 1) {
229 i = req->u.allocate_payload.number_sdp_streams - 1;
230 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
234 case DP_QUERY_PAYLOAD:
235 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
237 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
240 case DP_REMOTE_DPCD_READ:
241 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
242 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
246 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
248 buf[idx] = (req->u.dpcd_read.num_bytes);
252 case DP_REMOTE_DPCD_WRITE:
253 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
254 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
258 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
260 buf[idx] = (req->u.dpcd_write.num_bytes);
262 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
263 idx += req->u.dpcd_write.num_bytes;
265 case DP_REMOTE_I2C_READ:
266 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
267 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
269 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
270 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
272 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
274 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
275 idx += req->u.i2c_read.transactions[i].num_bytes;
277 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
278 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
281 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
283 buf[idx] = (req->u.i2c_read.num_bytes_read);
287 case DP_REMOTE_I2C_WRITE:
288 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
290 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
292 buf[idx] = (req->u.i2c_write.num_bytes);
294 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
295 idx += req->u.i2c_write.num_bytes;
301 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
304 crc4 = drm_dp_msg_data_crc4(msg, len);
308 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
309 struct drm_dp_sideband_msg_tx *raw)
314 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
319 /* this adds a chunk of msg to the builder to get the final msg */
320 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
321 u8 *replybuf, u8 replybuflen, bool hdr)
328 struct drm_dp_sideband_msg_hdr recv_hdr;
329 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
331 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
336 * ignore out-of-order messages or messages that are part of a
339 if (!recv_hdr.somt && !msg->have_somt)
342 /* get length contained in this portion */
343 msg->curchunk_len = recv_hdr.msg_len;
344 msg->curchunk_hdrlen = hdrlen;
346 /* we have already gotten an somt - don't bother parsing */
347 if (recv_hdr.somt && msg->have_somt)
351 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
352 msg->have_somt = true;
355 msg->have_eomt = true;
357 /* copy the bytes for the remainder of this header chunk */
358 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
359 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
361 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
362 msg->curchunk_idx += replybuflen;
365 if (msg->curchunk_idx >= msg->curchunk_len) {
367 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
368 /* copy chunk into bigger msg */
369 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
370 msg->curlen += msg->curchunk_len - 1;
375 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
376 struct drm_dp_sideband_msg_reply_body *repmsg)
380 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
382 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
384 if (idx > raw->curlen)
386 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
387 if (raw->msg[idx] & 0x80)
388 repmsg->u.link_addr.ports[i].input_port = 1;
390 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
391 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
394 if (idx > raw->curlen)
396 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
397 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
398 if (repmsg->u.link_addr.ports[i].input_port == 0)
399 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
401 if (idx > raw->curlen)
403 if (repmsg->u.link_addr.ports[i].input_port == 0) {
404 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
406 if (idx > raw->curlen)
408 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
410 if (idx > raw->curlen)
412 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
413 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
417 if (idx > raw->curlen)
423 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
427 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
428 struct drm_dp_sideband_msg_reply_body *repmsg)
431 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
433 if (idx > raw->curlen)
435 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
436 if (idx > raw->curlen)
439 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
442 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
446 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
447 struct drm_dp_sideband_msg_reply_body *repmsg)
450 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
452 if (idx > raw->curlen)
456 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
460 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
461 struct drm_dp_sideband_msg_reply_body *repmsg)
465 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
467 if (idx > raw->curlen)
469 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
472 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
475 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
479 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
480 struct drm_dp_sideband_msg_reply_body *repmsg)
483 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
485 if (idx > raw->curlen)
487 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
489 if (idx > raw->curlen)
491 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
493 if (idx > raw->curlen)
497 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
501 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
502 struct drm_dp_sideband_msg_reply_body *repmsg)
505 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
507 if (idx > raw->curlen)
509 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
511 if (idx > raw->curlen)
513 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
515 if (idx > raw->curlen)
519 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
523 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
524 struct drm_dp_sideband_msg_reply_body *repmsg)
527 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
529 if (idx > raw->curlen)
531 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
533 if (idx > raw->curlen)
537 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
541 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
542 struct drm_dp_sideband_msg_reply_body *msg)
544 memset(msg, 0, sizeof(*msg));
545 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
546 msg->req_type = (raw->msg[0] & 0x7f);
548 if (msg->reply_type) {
549 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
550 msg->u.nak.reason = raw->msg[17];
551 msg->u.nak.nak_data = raw->msg[18];
555 switch (msg->req_type) {
556 case DP_LINK_ADDRESS:
557 return drm_dp_sideband_parse_link_address(raw, msg);
558 case DP_QUERY_PAYLOAD:
559 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
560 case DP_REMOTE_DPCD_READ:
561 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
562 case DP_REMOTE_DPCD_WRITE:
563 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
564 case DP_REMOTE_I2C_READ:
565 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
566 case DP_ENUM_PATH_RESOURCES:
567 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
568 case DP_ALLOCATE_PAYLOAD:
569 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
571 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
576 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
577 struct drm_dp_sideband_msg_req_body *msg)
581 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
583 if (idx > raw->curlen)
586 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
588 if (idx > raw->curlen)
591 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
592 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
593 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
594 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
595 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
599 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
603 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
604 struct drm_dp_sideband_msg_req_body *msg)
608 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
610 if (idx > raw->curlen)
613 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
615 if (idx > raw->curlen)
618 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
622 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
626 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
627 struct drm_dp_sideband_msg_req_body *msg)
629 memset(msg, 0, sizeof(*msg));
630 msg->req_type = (raw->msg[0] & 0x7f);
632 switch (msg->req_type) {
633 case DP_CONNECTION_STATUS_NOTIFY:
634 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
635 case DP_RESOURCE_STATUS_NOTIFY:
636 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
638 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
643 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
645 struct drm_dp_sideband_msg_req_body req;
647 req.req_type = DP_REMOTE_DPCD_WRITE;
648 req.u.dpcd_write.port_number = port_num;
649 req.u.dpcd_write.dpcd_address = offset;
650 req.u.dpcd_write.num_bytes = num_bytes;
651 req.u.dpcd_write.bytes = bytes;
652 drm_dp_encode_sideband_req(&req, msg);
657 static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
659 struct drm_dp_sideband_msg_req_body req;
661 req.req_type = DP_LINK_ADDRESS;
662 drm_dp_encode_sideband_req(&req, msg);
666 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
668 struct drm_dp_sideband_msg_req_body req;
670 req.req_type = DP_ENUM_PATH_RESOURCES;
671 req.u.port_num.port_number = port_num;
672 drm_dp_encode_sideband_req(&req, msg);
673 msg->path_msg = true;
677 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
678 u8 vcpi, uint16_t pbn,
679 u8 number_sdp_streams,
682 struct drm_dp_sideband_msg_req_body req;
683 memset(&req, 0, sizeof(req));
684 req.req_type = DP_ALLOCATE_PAYLOAD;
685 req.u.allocate_payload.port_number = port_num;
686 req.u.allocate_payload.vcpi = vcpi;
687 req.u.allocate_payload.pbn = pbn;
688 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
689 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
691 drm_dp_encode_sideband_req(&req, msg);
692 msg->path_msg = true;
696 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
697 struct drm_dp_vcpi *vcpi)
701 mutex_lock(&mgr->payload_lock);
702 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
703 if (ret > mgr->max_payloads) {
705 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
709 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
710 if (vcpi_ret > mgr->max_payloads) {
712 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
716 set_bit(ret, &mgr->payload_mask);
717 set_bit(vcpi_ret, &mgr->vcpi_mask);
718 vcpi->vcpi = vcpi_ret + 1;
719 mgr->proposed_vcpis[ret - 1] = vcpi;
721 mutex_unlock(&mgr->payload_lock);
725 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
732 mutex_lock(&mgr->payload_lock);
733 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
734 clear_bit(vcpi - 1, &mgr->vcpi_mask);
736 for (i = 0; i < mgr->max_payloads; i++) {
737 if (mgr->proposed_vcpis[i])
738 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
739 mgr->proposed_vcpis[i] = NULL;
740 clear_bit(i + 1, &mgr->payload_mask);
743 mutex_unlock(&mgr->payload_lock);
746 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
747 struct drm_dp_sideband_msg_tx *txmsg)
752 * All updates to txmsg->state are protected by mgr->qlock, and the two
753 * cases we check here are terminal states. For those the barriers
754 * provided by the wake_up/wait_event pair are enough.
756 state = READ_ONCE(txmsg->state);
757 return (state == DRM_DP_SIDEBAND_TX_RX ||
758 state == DRM_DP_SIDEBAND_TX_TIMEOUT);
761 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
762 struct drm_dp_sideband_msg_tx *txmsg)
764 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
767 ret = wait_event_timeout(mgr->tx_waitq,
768 check_txmsg_state(mgr, txmsg),
770 mutex_lock(&mstb->mgr->qlock);
772 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
777 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
779 /* dump some state */
783 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
784 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
785 list_del(&txmsg->next);
788 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
789 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
790 mstb->tx_slots[txmsg->seqno] = NULL;
794 mutex_unlock(&mgr->qlock);
799 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
801 struct drm_dp_mst_branch *mstb;
803 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
809 memcpy(mstb->rad, rad, lct / 2);
810 INIT_LIST_HEAD(&mstb->ports);
811 kref_init(&mstb->kref);
815 static void drm_dp_free_mst_port(struct kref *kref);
817 static void drm_dp_free_mst_branch_device(struct kref *kref)
819 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
820 if (mstb->port_parent) {
821 if (list_empty(&mstb->port_parent->next))
822 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
827 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
829 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
830 struct drm_dp_mst_port *port, *tmp;
831 bool wake_tx = false;
834 * init kref again to be used by ports to remove mst branch when it is
839 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
840 kref_get(&mstb->port_parent->kref);
843 * destroy all ports - don't need lock
844 * as there are no more references to the mst branch
845 * device at this point.
847 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
848 list_del(&port->next);
849 drm_dp_put_port(port);
852 /* drop any tx slots msg */
853 mutex_lock(&mstb->mgr->qlock);
854 if (mstb->tx_slots[0]) {
855 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
856 mstb->tx_slots[0] = NULL;
859 if (mstb->tx_slots[1]) {
860 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
861 mstb->tx_slots[1] = NULL;
864 mutex_unlock(&mstb->mgr->qlock);
867 wake_up_all(&mstb->mgr->tx_waitq);
869 kref_put(kref, drm_dp_free_mst_branch_device);
872 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
874 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
878 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
880 struct drm_dp_mst_branch *mstb;
883 case DP_PEER_DEVICE_DP_LEGACY_CONV:
884 case DP_PEER_DEVICE_SST_SINK:
885 /* remove i2c over sideband */
886 drm_dp_mst_unregister_i2c_bus(&port->aux);
888 case DP_PEER_DEVICE_MST_BRANCHING:
891 drm_dp_put_mst_branch_device(mstb);
896 static void drm_dp_destroy_port(struct kref *kref)
898 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
899 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
902 port->vcpi.num_slots = 0;
904 kfree(port->cached_edid);
907 * The only time we don't have a connector
908 * on an output port is if the connector init
911 if (port->connector) {
912 /* we can't destroy the connector here, as
913 * we might be holding the mode_config.mutex
914 * from an EDID retrieval */
916 mutex_lock(&mgr->destroy_connector_lock);
917 kref_get(&port->parent->kref);
918 list_add(&port->next, &mgr->destroy_connector_list);
919 mutex_unlock(&mgr->destroy_connector_lock);
920 schedule_work(&mgr->destroy_connector_work);
923 /* no need to clean up vcpi
924 * as if we have no connector we never setup a vcpi */
925 drm_dp_port_teardown_pdt(port, port->pdt);
926 port->pdt = DP_PEER_DEVICE_NONE;
931 static void drm_dp_put_port(struct drm_dp_mst_port *port)
933 kref_put(&port->kref, drm_dp_destroy_port);
936 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)
938 struct drm_dp_mst_port *port;
939 struct drm_dp_mst_branch *rmstb;
940 if (to_find == mstb) {
941 kref_get(&mstb->kref);
944 list_for_each_entry(port, &mstb->ports, next) {
946 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
954 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)
956 struct drm_dp_mst_branch *rmstb = NULL;
957 mutex_lock(&mgr->lock);
958 if (mgr->mst_primary)
959 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
960 mutex_unlock(&mgr->lock);
964 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)
966 struct drm_dp_mst_port *port, *mport;
968 list_for_each_entry(port, &mstb->ports, next) {
969 if (port == to_find) {
970 kref_get(&port->kref);
974 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
982 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)
984 struct drm_dp_mst_port *rport = NULL;
985 mutex_lock(&mgr->lock);
986 if (mgr->mst_primary)
987 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
988 mutex_unlock(&mgr->lock);
992 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
994 struct drm_dp_mst_port *port;
996 list_for_each_entry(port, &mstb->ports, next) {
997 if (port->port_num == port_num) {
998 kref_get(&port->kref);
1007 * calculate a new RAD for this MST branch device
1008 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1009 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1011 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1014 int parent_lct = port->parent->lct;
1016 int idx = (parent_lct - 1) / 2;
1017 if (parent_lct > 1) {
1018 memcpy(rad, port->parent->rad, idx + 1);
1019 shift = (parent_lct % 2) ? 4 : 0;
1023 rad[idx] |= port->port_num << shift;
1024 return parent_lct + 1;
1028 * return sends link address for new mstb
1030 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1034 bool send_link = false;
1035 switch (port->pdt) {
1036 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1037 case DP_PEER_DEVICE_SST_SINK:
1038 /* add i2c over sideband */
1039 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1041 case DP_PEER_DEVICE_MST_BRANCHING:
1042 lct = drm_dp_calculate_rad(port, rad);
1044 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1045 port->mstb->mgr = port->mgr;
1046 port->mstb->port_parent = port;
1054 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1058 memcpy(mstb->guid, guid, 16);
1060 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1061 if (mstb->port_parent) {
1062 ret = drm_dp_send_dpcd_write(
1070 ret = drm_dp_dpcd_write(
1079 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1082 size_t proppath_size)
1086 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1087 for (i = 0; i < (mstb->lct - 1); i++) {
1088 int shift = (i % 2) ? 0 : 4;
1089 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1090 snprintf(temp, sizeof(temp), "-%d", port_num);
1091 strlcat(proppath, temp, proppath_size);
1093 snprintf(temp, sizeof(temp), "-%d", pnum);
1094 strlcat(proppath, temp, proppath_size);
1097 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1098 struct drm_device *dev,
1099 struct drm_dp_link_addr_reply_port *port_msg)
1101 struct drm_dp_mst_port *port;
1103 bool created = false;
1106 port = drm_dp_get_port(mstb, port_msg->port_number);
1108 port = kzalloc(sizeof(*port), GFP_KERNEL);
1111 kref_init(&port->kref);
1112 port->parent = mstb;
1113 port->port_num = port_msg->port_number;
1114 port->mgr = mstb->mgr;
1115 port->aux.name = "DPMST";
1116 port->aux.dev = dev->dev;
1119 old_pdt = port->pdt;
1120 old_ddps = port->ddps;
1123 port->pdt = port_msg->peer_device_type;
1124 port->input = port_msg->input_port;
1125 port->mcs = port_msg->mcs;
1126 port->ddps = port_msg->ddps;
1127 port->ldps = port_msg->legacy_device_plug_status;
1128 port->dpcd_rev = port_msg->dpcd_revision;
1129 port->num_sdp_streams = port_msg->num_sdp_streams;
1130 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1132 /* manage mstb port lists with mgr lock - take a reference
1135 mutex_lock(&mstb->mgr->lock);
1136 kref_get(&port->kref);
1137 list_add(&port->next, &mstb->ports);
1138 mutex_unlock(&mstb->mgr->lock);
1141 if (old_ddps != port->ddps) {
1144 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1146 port->available_pbn = 0;
1150 if (old_pdt != port->pdt && !port->input) {
1151 drm_dp_port_teardown_pdt(port, old_pdt);
1153 ret = drm_dp_port_setup_pdt(port);
1155 drm_dp_send_link_address(mstb->mgr, port->mstb);
1158 if (created && !port->input) {
1161 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1162 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1163 if (!port->connector) {
1164 /* remove it from the port list */
1165 mutex_lock(&mstb->mgr->lock);
1166 list_del(&port->next);
1167 mutex_unlock(&mstb->mgr->lock);
1168 /* drop port list reference */
1169 drm_dp_put_port(port);
1172 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1173 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1174 port->port_num >= DP_MST_LOGICAL_PORT_0) {
1175 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1176 drm_mode_connector_set_tile_property(port->connector);
1178 (*mstb->mgr->cbs->register_connector)(port->connector);
1182 /* put reference to this port */
1183 drm_dp_put_port(port);
1186 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1187 struct drm_dp_connection_status_notify *conn_stat)
1189 struct drm_dp_mst_port *port;
1192 bool dowork = false;
1193 port = drm_dp_get_port(mstb, conn_stat->port_number);
1197 old_ddps = port->ddps;
1198 old_pdt = port->pdt;
1199 port->pdt = conn_stat->peer_device_type;
1200 port->mcs = conn_stat->message_capability_status;
1201 port->ldps = conn_stat->legacy_device_plug_status;
1202 port->ddps = conn_stat->displayport_device_plug_status;
1204 if (old_ddps != port->ddps) {
1208 port->available_pbn = 0;
1211 if (old_pdt != port->pdt && !port->input) {
1212 drm_dp_port_teardown_pdt(port, old_pdt);
1214 if (drm_dp_port_setup_pdt(port))
1218 drm_dp_put_port(port);
1220 queue_work(system_long_wq, &mstb->mgr->work);
1224 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1227 struct drm_dp_mst_branch *mstb;
1228 struct drm_dp_mst_port *port;
1230 /* find the port by iterating down */
1232 mutex_lock(&mgr->lock);
1233 mstb = mgr->mst_primary;
1235 for (i = 0; i < lct - 1; i++) {
1236 int shift = (i % 2) ? 0 : 4;
1237 int port_num = (rad[i / 2] >> shift) & 0xf;
1239 list_for_each_entry(port, &mstb->ports, next) {
1240 if (port->port_num == port_num) {
1243 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1251 kref_get(&mstb->kref);
1253 mutex_unlock(&mgr->lock);
1257 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1258 struct drm_dp_mst_branch *mstb,
1261 struct drm_dp_mst_branch *found_mstb;
1262 struct drm_dp_mst_port *port;
1264 if (memcmp(mstb->guid, guid, 16) == 0)
1268 list_for_each_entry(port, &mstb->ports, next) {
1272 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1281 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1282 struct drm_dp_mst_topology_mgr *mgr,
1285 struct drm_dp_mst_branch *mstb;
1287 /* find the port by iterating down */
1288 mutex_lock(&mgr->lock);
1290 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1293 kref_get(&mstb->kref);
1295 mutex_unlock(&mgr->lock);
1299 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1300 struct drm_dp_mst_branch *mstb)
1302 struct drm_dp_mst_port *port;
1303 struct drm_dp_mst_branch *mstb_child;
1304 if (!mstb->link_address_sent)
1305 drm_dp_send_link_address(mgr, mstb);
1307 list_for_each_entry(port, &mstb->ports, next) {
1314 if (!port->available_pbn)
1315 drm_dp_send_enum_path_resources(mgr, mstb, port);
1318 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1320 drm_dp_check_and_send_link_address(mgr, mstb_child);
1321 drm_dp_put_mst_branch_device(mstb_child);
1327 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1329 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1330 struct drm_dp_mst_branch *mstb;
1332 mutex_lock(&mgr->lock);
1333 mstb = mgr->mst_primary;
1335 kref_get(&mstb->kref);
1337 mutex_unlock(&mgr->lock);
1339 drm_dp_check_and_send_link_address(mgr, mstb);
1340 drm_dp_put_mst_branch_device(mstb);
1344 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1349 if (memchr_inv(guid, 0, 16))
1352 salt = get_jiffies_64();
1354 memcpy(&guid[0], &salt, sizeof(u64));
1355 memcpy(&guid[8], &salt, sizeof(u64));
1361 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1363 struct drm_dp_sideband_msg_req_body req;
1365 req.req_type = DP_REMOTE_DPCD_READ;
1366 req.u.dpcd_read.port_number = port_num;
1367 req.u.dpcd_read.dpcd_address = offset;
1368 req.u.dpcd_read.num_bytes = num_bytes;
1369 drm_dp_encode_sideband_req(&req, msg);
1375 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1376 bool up, u8 *msg, int len)
1379 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1380 int tosend, total, offset;
1387 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1389 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1392 if (ret != tosend) {
1393 if (ret == -EIO && retries < 5) {
1397 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1403 } while (total > 0);
1407 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1408 struct drm_dp_sideband_msg_tx *txmsg)
1410 struct drm_dp_mst_branch *mstb = txmsg->dst;
1413 /* both msg slots are full */
1414 if (txmsg->seqno == -1) {
1415 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1416 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1419 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1420 txmsg->seqno = mstb->last_seqno;
1421 mstb->last_seqno ^= 1;
1422 } else if (mstb->tx_slots[0] == NULL)
1426 mstb->tx_slots[txmsg->seqno] = txmsg;
1429 req_type = txmsg->msg[0] & 0x7f;
1430 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1431 req_type == DP_RESOURCE_STATUS_NOTIFY)
1435 hdr->path_msg = txmsg->path_msg;
1436 hdr->lct = mstb->lct;
1437 hdr->lcr = mstb->lct - 1;
1439 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1440 hdr->seqno = txmsg->seqno;
1444 * process a single block of the next message in the sideband queue
1446 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1447 struct drm_dp_sideband_msg_tx *txmsg,
1451 struct drm_dp_sideband_msg_hdr hdr;
1452 int len, space, idx, tosend;
1455 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1457 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1459 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1462 /* make hdr from dst mst - for replies use seqno
1463 otherwise assign one */
1464 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1468 /* amount left to send in this message */
1469 len = txmsg->cur_len - txmsg->cur_offset;
1471 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1472 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1474 tosend = min(len, space);
1475 if (len == txmsg->cur_len)
1481 hdr.msg_len = tosend + 1;
1482 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1483 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1484 /* add crc at end */
1485 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1488 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1490 DRM_DEBUG_KMS("sideband msg failed to send\n");
1494 txmsg->cur_offset += tosend;
1495 if (txmsg->cur_offset == txmsg->cur_len) {
1496 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1502 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1504 struct drm_dp_sideband_msg_tx *txmsg;
1507 WARN_ON(!mutex_is_locked(&mgr->qlock));
1509 /* construct a chunk from the first msg in the tx_msg queue */
1510 if (list_empty(&mgr->tx_msg_downq))
1513 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1514 ret = process_single_tx_qlock(mgr, txmsg, false);
1516 /* txmsg is sent it should be in the slots now */
1517 list_del(&txmsg->next);
1519 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1520 list_del(&txmsg->next);
1521 if (txmsg->seqno != -1)
1522 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1523 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1524 wake_up_all(&mgr->tx_waitq);
1528 /* called holding qlock */
1529 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1530 struct drm_dp_sideband_msg_tx *txmsg)
1534 /* construct a chunk from the first msg in the tx_msg queue */
1535 ret = process_single_tx_qlock(mgr, txmsg, true);
1538 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1540 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1543 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1544 struct drm_dp_sideband_msg_tx *txmsg)
1546 mutex_lock(&mgr->qlock);
1547 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1548 if (list_is_singular(&mgr->tx_msg_downq))
1549 process_single_down_tx_qlock(mgr);
1550 mutex_unlock(&mgr->qlock);
1553 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1554 struct drm_dp_mst_branch *mstb)
1557 struct drm_dp_sideband_msg_tx *txmsg;
1560 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1565 len = build_link_address(txmsg);
1567 mstb->link_address_sent = true;
1568 drm_dp_queue_down_tx(mgr, txmsg);
1570 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1574 if (txmsg->reply.reply_type == 1)
1575 DRM_DEBUG_KMS("link address nak received\n");
1577 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1578 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1579 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,
1580 txmsg->reply.u.link_addr.ports[i].input_port,
1581 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1582 txmsg->reply.u.link_addr.ports[i].port_number,
1583 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1584 txmsg->reply.u.link_addr.ports[i].mcs,
1585 txmsg->reply.u.link_addr.ports[i].ddps,
1586 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1587 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1588 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1591 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1593 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1594 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1596 (*mgr->cbs->hotplug)(mgr);
1599 mstb->link_address_sent = false;
1600 DRM_DEBUG_KMS("link address failed %d\n", ret);
1606 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1607 struct drm_dp_mst_branch *mstb,
1608 struct drm_dp_mst_port *port)
1611 struct drm_dp_sideband_msg_tx *txmsg;
1614 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1619 len = build_enum_path_resources(txmsg, port->port_num);
1621 drm_dp_queue_down_tx(mgr, txmsg);
1623 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1625 if (txmsg->reply.reply_type == 1)
1626 DRM_DEBUG_KMS("enum path resources nak received\n");
1628 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1629 DRM_ERROR("got incorrect port in response\n");
1630 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,
1631 txmsg->reply.u.path_resources.avail_payload_bw_number);
1632 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1640 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1642 if (!mstb->port_parent)
1645 if (mstb->port_parent->mstb != mstb)
1646 return mstb->port_parent;
1648 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1651 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1652 struct drm_dp_mst_branch *mstb,
1655 struct drm_dp_mst_branch *rmstb = NULL;
1656 struct drm_dp_mst_port *found_port;
1657 mutex_lock(&mgr->lock);
1658 if (mgr->mst_primary) {
1659 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1662 rmstb = found_port->parent;
1663 kref_get(&rmstb->kref);
1664 *port_num = found_port->port_num;
1667 mutex_unlock(&mgr->lock);
1671 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1672 struct drm_dp_mst_port *port,
1676 struct drm_dp_sideband_msg_tx *txmsg;
1677 struct drm_dp_mst_branch *mstb;
1678 int len, ret, port_num;
1679 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1682 port = drm_dp_get_validated_port_ref(mgr, port);
1686 port_num = port->port_num;
1687 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1689 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1692 drm_dp_put_port(port);
1697 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1703 for (i = 0; i < port->num_sdp_streams; i++)
1707 len = build_allocate_payload(txmsg, port_num,
1709 pbn, port->num_sdp_streams, sinks);
1711 drm_dp_queue_down_tx(mgr, txmsg);
1713 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1715 if (txmsg->reply.reply_type == 1) {
1722 drm_dp_put_mst_branch_device(mstb);
1723 drm_dp_put_port(port);
1727 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1729 struct drm_dp_payload *payload)
1733 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1735 payload->payload_state = 0;
1738 payload->payload_state = DP_PAYLOAD_LOCAL;
1742 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1743 struct drm_dp_mst_port *port,
1745 struct drm_dp_payload *payload)
1748 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1751 payload->payload_state = DP_PAYLOAD_REMOTE;
1755 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1756 struct drm_dp_mst_port *port,
1758 struct drm_dp_payload *payload)
1760 DRM_DEBUG_KMS("\n");
1761 /* its okay for these to fail */
1763 drm_dp_payload_send_msg(mgr, port, id, 0);
1766 drm_dp_dpcd_write_payload(mgr, id, payload);
1767 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1771 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1773 struct drm_dp_payload *payload)
1775 payload->payload_state = 0;
1780 * drm_dp_update_payload_part1() - Execute payload update part 1
1781 * @mgr: manager to use.
1783 * This iterates over all proposed virtual channels, and tries to
1784 * allocate space in the link for them. For 0->slots transitions,
1785 * this step just writes the VCPI to the MST device. For slots->0
1786 * transitions, this writes the updated VCPIs and removes the
1787 * remote VC payloads.
1789 * after calling this the driver should generate ACT and payload
1792 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1796 struct drm_dp_payload req_payload;
1797 struct drm_dp_mst_port *port;
1799 mutex_lock(&mgr->payload_lock);
1800 for (i = 0; i < mgr->max_payloads; i++) {
1801 /* solve the current payloads - compare to the hw ones
1802 - update the hw view */
1803 req_payload.start_slot = cur_slots;
1804 if (mgr->proposed_vcpis[i]) {
1805 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1806 port = drm_dp_get_validated_port_ref(mgr, port);
1808 mutex_unlock(&mgr->payload_lock);
1811 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1812 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1815 req_payload.num_slots = 0;
1818 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1819 mgr->payloads[i].start_slot = req_payload.start_slot;
1821 /* work out what is required to happen with this payload */
1822 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1824 /* need to push an update for this payload */
1825 if (req_payload.num_slots) {
1826 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1827 mgr->payloads[i].num_slots = req_payload.num_slots;
1828 mgr->payloads[i].vcpi = req_payload.vcpi;
1829 } else if (mgr->payloads[i].num_slots) {
1830 mgr->payloads[i].num_slots = 0;
1831 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1832 req_payload.payload_state = mgr->payloads[i].payload_state;
1833 mgr->payloads[i].start_slot = 0;
1835 mgr->payloads[i].payload_state = req_payload.payload_state;
1837 cur_slots += req_payload.num_slots;
1840 drm_dp_put_port(port);
1843 for (i = 0; i < mgr->max_payloads; i++) {
1844 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1845 DRM_DEBUG_KMS("removing payload %d\n", i);
1846 for (j = i; j < mgr->max_payloads - 1; j++) {
1847 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1848 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1849 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1850 set_bit(j + 1, &mgr->payload_mask);
1852 clear_bit(j + 1, &mgr->payload_mask);
1855 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1856 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1857 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1861 mutex_unlock(&mgr->payload_lock);
1865 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1868 * drm_dp_update_payload_part2() - Execute payload update part 2
1869 * @mgr: manager to use.
1871 * This iterates over all proposed virtual channels, and tries to
1872 * allocate space in the link for them. For 0->slots transitions,
1873 * this step writes the remote VC payload commands. For slots->0
1874 * this just resets some internal state.
1876 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1878 struct drm_dp_mst_port *port;
1881 mutex_lock(&mgr->payload_lock);
1882 for (i = 0; i < mgr->max_payloads; i++) {
1884 if (!mgr->proposed_vcpis[i])
1887 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1889 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1890 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1891 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1892 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1893 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1896 mutex_unlock(&mgr->payload_lock);
1900 mutex_unlock(&mgr->payload_lock);
1903 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1905 #if 0 /* unused as of yet */
1906 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1907 struct drm_dp_mst_port *port,
1908 int offset, int size)
1911 struct drm_dp_sideband_msg_tx *txmsg;
1913 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1917 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1918 txmsg->dst = port->parent;
1920 drm_dp_queue_down_tx(mgr, txmsg);
1926 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1927 struct drm_dp_mst_port *port,
1928 int offset, int size, u8 *bytes)
1932 struct drm_dp_sideband_msg_tx *txmsg;
1933 struct drm_dp_mst_branch *mstb;
1935 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1939 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1945 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1948 drm_dp_queue_down_tx(mgr, txmsg);
1950 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1952 if (txmsg->reply.reply_type == 1) {
1959 drm_dp_put_mst_branch_device(mstb);
1963 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1965 struct drm_dp_sideband_msg_reply_body reply;
1967 reply.reply_type = 0;
1968 reply.req_type = req_type;
1969 drm_dp_encode_sideband_reply(&reply, msg);
1973 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1974 struct drm_dp_mst_branch *mstb,
1975 int req_type, int seqno, bool broadcast)
1977 struct drm_dp_sideband_msg_tx *txmsg;
1979 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1984 txmsg->seqno = seqno;
1985 drm_dp_encode_up_ack_reply(txmsg, req_type);
1987 mutex_lock(&mgr->qlock);
1989 process_single_up_tx_qlock(mgr, txmsg);
1991 mutex_unlock(&mgr->qlock);
1997 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
2001 switch (dp_link_bw) {
2003 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
2004 dp_link_bw, dp_link_count);
2007 case DP_LINK_BW_1_62:
2008 *out = 3 * dp_link_count;
2010 case DP_LINK_BW_2_7:
2011 *out = 5 * dp_link_count;
2013 case DP_LINK_BW_5_4:
2014 *out = 10 * dp_link_count;
2021 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2022 * @mgr: manager to set state for
2023 * @mst_state: true to enable MST on this connector - false to disable.
2025 * This is called by the driver when it detects an MST capable device plugged
2026 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2028 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2031 struct drm_dp_mst_branch *mstb = NULL;
2033 mutex_lock(&mgr->lock);
2034 if (mst_state == mgr->mst_state)
2037 mgr->mst_state = mst_state;
2038 /* set the device into MST mode */
2040 WARN_ON(mgr->mst_primary);
2043 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2044 if (ret != DP_RECEIVER_CAP_SIZE) {
2045 DRM_DEBUG_KMS("failed to read DPCD\n");
2049 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2050 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2056 /* add initial branch device at LCT 1 */
2057 mstb = drm_dp_add_mst_branch_device(1, NULL);
2064 /* give this the main reference */
2065 mgr->mst_primary = mstb;
2066 kref_get(&mgr->mst_primary->kref);
2068 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2069 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2075 struct drm_dp_payload reset_pay;
2076 reset_pay.start_slot = 0;
2077 reset_pay.num_slots = 0x3f;
2078 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2081 queue_work(system_long_wq, &mgr->work);
2085 /* disable MST on the device */
2086 mstb = mgr->mst_primary;
2087 mgr->mst_primary = NULL;
2088 /* this can fail if the device is gone */
2089 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2091 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
2092 mgr->payload_mask = 0;
2093 set_bit(0, &mgr->payload_mask);
2098 mutex_unlock(&mgr->lock);
2100 drm_dp_put_mst_branch_device(mstb);
2104 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2107 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2108 * @mgr: manager to suspend
2110 * This function tells the MST device that we can't handle UP messages
2111 * anymore. This should stop it from sending any since we are suspended.
2113 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2115 mutex_lock(&mgr->lock);
2116 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2117 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2118 mutex_unlock(&mgr->lock);
2119 flush_work(&mgr->work);
2120 flush_work(&mgr->destroy_connector_work);
2122 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2125 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2126 * @mgr: manager to resume
2128 * This will fetch DPCD and see if the device is still there,
2129 * if it is, it will rewrite the MSTM control bits, and return.
2131 * if the device fails this returns -1, and the driver should do
2132 * a full MST reprobe, in case we were undocked.
2134 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2138 mutex_lock(&mgr->lock);
2140 if (mgr->mst_primary) {
2144 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2145 if (sret != DP_RECEIVER_CAP_SIZE) {
2146 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2151 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2152 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2154 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2159 /* Some hubs forget their guids after they resume */
2160 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2162 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2166 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2173 mutex_unlock(&mgr->lock);
2176 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2178 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2182 int replylen, origlen, curreply;
2184 struct drm_dp_sideband_msg_rx *msg;
2185 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2186 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2188 len = min(mgr->max_dpcd_transaction_bytes, 16);
2189 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2192 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2195 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2197 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2200 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2205 while (replylen > 0) {
2206 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2207 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2210 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
2215 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2217 DRM_DEBUG_KMS("failed to build sideband msg\n");
2227 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2231 if (!drm_dp_get_one_sb_msg(mgr, false)) {
2232 memset(&mgr->down_rep_recv, 0,
2233 sizeof(struct drm_dp_sideband_msg_rx));
2237 if (mgr->down_rep_recv.have_eomt) {
2238 struct drm_dp_sideband_msg_tx *txmsg;
2239 struct drm_dp_mst_branch *mstb;
2241 mstb = drm_dp_get_mst_branch_device(mgr,
2242 mgr->down_rep_recv.initial_hdr.lct,
2243 mgr->down_rep_recv.initial_hdr.rad);
2246 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2247 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2251 /* find the message */
2252 slot = mgr->down_rep_recv.initial_hdr.seqno;
2253 mutex_lock(&mgr->qlock);
2254 txmsg = mstb->tx_slots[slot];
2255 /* remove from slots */
2256 mutex_unlock(&mgr->qlock);
2259 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2261 mgr->down_rep_recv.initial_hdr.seqno,
2262 mgr->down_rep_recv.initial_hdr.lct,
2263 mgr->down_rep_recv.initial_hdr.rad[0],
2264 mgr->down_rep_recv.msg[0]);
2265 drm_dp_put_mst_branch_device(mstb);
2266 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2270 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2271 if (txmsg->reply.reply_type == 1) {
2272 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);
2275 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2276 drm_dp_put_mst_branch_device(mstb);
2278 mutex_lock(&mgr->qlock);
2279 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2280 mstb->tx_slots[slot] = NULL;
2281 mutex_unlock(&mgr->qlock);
2283 wake_up_all(&mgr->tx_waitq);
2288 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2292 if (!drm_dp_get_one_sb_msg(mgr, true)) {
2293 memset(&mgr->up_req_recv, 0,
2294 sizeof(struct drm_dp_sideband_msg_rx));
2298 if (mgr->up_req_recv.have_eomt) {
2299 struct drm_dp_sideband_msg_req_body msg;
2300 struct drm_dp_mst_branch *mstb = NULL;
2303 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2304 mstb = drm_dp_get_mst_branch_device(mgr,
2305 mgr->up_req_recv.initial_hdr.lct,
2306 mgr->up_req_recv.initial_hdr.rad);
2308 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2309 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2314 seqno = mgr->up_req_recv.initial_hdr.seqno;
2315 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2317 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2318 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2321 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
2324 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2325 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2329 drm_dp_update_port(mstb, &msg.u.conn_stat);
2331 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);
2332 (*mgr->cbs->hotplug)(mgr);
2334 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2335 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2337 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2340 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2341 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2345 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2349 drm_dp_put_mst_branch_device(mstb);
2351 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2357 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2358 * @mgr: manager to notify irq for.
2359 * @esi: 4 bytes from SINK_COUNT_ESI
2360 * @handled: whether the hpd interrupt was consumed or not
2362 * This should be called from the driver when it detects a short IRQ,
2363 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2364 * topology manager will process the sideband messages received as a result
2367 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2374 if (sc != mgr->sink_count) {
2375 mgr->sink_count = sc;
2379 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2380 ret = drm_dp_mst_handle_down_rep(mgr);
2384 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2385 ret |= drm_dp_mst_handle_up_req(mgr);
2389 drm_dp_mst_kick_tx(mgr);
2392 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2395 * drm_dp_mst_detect_port() - get connection status for an MST port
2396 * @connector: DRM connector for this port
2397 * @mgr: manager for this port
2398 * @port: unverified pointer to a port
2400 * This returns the current connection state for a port. It validates the
2401 * port pointer still exists so the caller doesn't require a reference
2403 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2404 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2406 enum drm_connector_status status = connector_status_disconnected;
2408 /* we need to search for the port in the mgr in case its gone */
2409 port = drm_dp_get_validated_port_ref(mgr, port);
2411 return connector_status_disconnected;
2416 switch (port->pdt) {
2417 case DP_PEER_DEVICE_NONE:
2418 case DP_PEER_DEVICE_MST_BRANCHING:
2421 case DP_PEER_DEVICE_SST_SINK:
2422 status = connector_status_connected;
2423 /* for logical ports - cache the EDID */
2424 if (port->port_num >= 8 && !port->cached_edid) {
2425 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2428 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2430 status = connector_status_connected;
2434 drm_dp_put_port(port);
2437 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2440 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2441 * @mgr: manager for this port
2442 * @port: unverified pointer to a port.
2444 * This returns whether the port supports audio or not.
2446 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2447 struct drm_dp_mst_port *port)
2451 port = drm_dp_get_validated_port_ref(mgr, port);
2454 ret = port->has_audio;
2455 drm_dp_put_port(port);
2458 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2461 * drm_dp_mst_get_edid() - get EDID for an MST port
2462 * @connector: toplevel connector to get EDID for
2463 * @mgr: manager for this port
2464 * @port: unverified pointer to a port.
2466 * This returns an EDID for the port connected to a connector,
2467 * It validates the pointer still exists so the caller doesn't require a
2470 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2472 struct edid *edid = NULL;
2474 /* we need to search for the port in the mgr in case its gone */
2475 port = drm_dp_get_validated_port_ref(mgr, port);
2479 if (port->cached_edid)
2480 edid = drm_edid_duplicate(port->cached_edid);
2482 edid = drm_get_edid(connector, &port->aux.ddc);
2483 drm_mode_connector_set_tile_property(connector);
2485 port->has_audio = drm_detect_monitor_audio(edid);
2486 drm_dp_put_port(port);
2489 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2492 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2493 * @mgr: manager to use
2494 * @pbn: payload bandwidth to convert into slots.
2496 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2501 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2503 /* max. time slots - one slot for MTP header */
2508 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2510 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2511 struct drm_dp_vcpi *vcpi, int pbn, int slots)
2515 /* max. time slots - one slot for MTP header */
2520 vcpi->aligned_pbn = slots * mgr->pbn_div;
2521 vcpi->num_slots = slots;
2523 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2530 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2531 * @state: global atomic state
2532 * @mgr: MST topology manager for the port
2533 * @port: port to find vcpi slots for
2534 * @pbn: bandwidth required for the mode in PBN
2537 * Total slots in the atomic state assigned for this port or error
2539 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2540 struct drm_dp_mst_topology_mgr *mgr,
2541 struct drm_dp_mst_port *port, int pbn)
2543 struct drm_dp_mst_topology_state *topology_state;
2546 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2547 if (IS_ERR(topology_state))
2548 return PTR_ERR(topology_state);
2550 port = drm_dp_get_validated_port_ref(mgr, port);
2553 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2554 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2555 req_slots, topology_state->avail_slots);
2557 if (req_slots > topology_state->avail_slots) {
2558 drm_dp_put_port(port);
2562 topology_state->avail_slots -= req_slots;
2563 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2565 drm_dp_put_port(port);
2568 EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2571 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2572 * @state: global atomic state
2573 * @mgr: MST topology manager for the port
2574 * @slots: number of vcpi slots to release
2577 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2578 * negative error code
2580 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2581 struct drm_dp_mst_topology_mgr *mgr,
2584 struct drm_dp_mst_topology_state *topology_state;
2586 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2587 if (IS_ERR(topology_state))
2588 return PTR_ERR(topology_state);
2590 /* We cannot rely on port->vcpi.num_slots to update
2591 * topology_state->avail_slots as the port may not exist if the parent
2592 * branch device was unplugged. This should be fixed by tracking
2593 * per-port slot allocation in drm_dp_mst_topology_state instead of
2594 * depending on the caller to tell us how many slots to release.
2596 topology_state->avail_slots += slots;
2597 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2598 slots, topology_state->avail_slots);
2602 EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2605 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2606 * @mgr: manager for this port
2607 * @port: port to allocate a virtual channel for.
2608 * @pbn: payload bandwidth number to request
2609 * @slots: returned number of slots for this PBN.
2611 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2612 struct drm_dp_mst_port *port, int pbn, int slots)
2616 port = drm_dp_get_validated_port_ref(mgr, port);
2623 if (port->vcpi.vcpi > 0) {
2624 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2625 if (pbn == port->vcpi.pbn) {
2626 drm_dp_put_port(port);
2631 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
2633 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2634 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
2637 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2638 pbn, port->vcpi.num_slots);
2640 drm_dp_put_port(port);
2645 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2647 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2650 port = drm_dp_get_validated_port_ref(mgr, port);
2654 slots = port->vcpi.num_slots;
2655 drm_dp_put_port(port);
2658 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2661 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2662 * @mgr: manager for this port
2663 * @port: unverified pointer to a port.
2665 * This just resets the number of slots for the ports VCPI for later programming.
2667 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2669 port = drm_dp_get_validated_port_ref(mgr, port);
2672 port->vcpi.num_slots = 0;
2673 drm_dp_put_port(port);
2675 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2678 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2679 * @mgr: manager for this port
2680 * @port: unverified port to deallocate vcpi for
2682 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2684 port = drm_dp_get_validated_port_ref(mgr, port);
2688 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2689 port->vcpi.num_slots = 0;
2691 port->vcpi.aligned_pbn = 0;
2692 port->vcpi.vcpi = 0;
2693 drm_dp_put_port(port);
2695 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2697 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2698 int id, struct drm_dp_payload *payload)
2700 u8 payload_alloc[3], status;
2704 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2705 DP_PAYLOAD_TABLE_UPDATED);
2707 payload_alloc[0] = id;
2708 payload_alloc[1] = payload->start_slot;
2709 payload_alloc[2] = payload->num_slots;
2711 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2713 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2718 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2720 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2724 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2727 usleep_range(10000, 20000);
2730 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2741 * drm_dp_check_act_status() - Check ACT handled status.
2742 * @mgr: manager to use
2744 * Check the payload status bits in the DPCD for ACT handled completion.
2746 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2753 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2756 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2760 if (status & DP_PAYLOAD_ACT_HANDLED)
2765 } while (count < 30);
2767 if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
2768 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
2776 EXPORT_SYMBOL(drm_dp_check_act_status);
2779 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2780 * @clock: dot clock for the mode
2781 * @bpp: bpp for the mode.
2783 * This uses the formula in the spec to calculate the PBN value for a mode.
2785 int drm_dp_calc_pbn_mode(int clock, int bpp)
2795 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2796 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2797 * common multiplier to render an integer PBN for all link rate/lane
2798 * counts combinations
2800 * peak_kbps *= (1006/1000)
2801 * peak_kbps *= (64/54)
2802 * peak_kbps *= 8 convert to bytes
2805 numerator = 64 * 1006;
2806 denominator = 54 * 8 * 1000 * 1000;
2809 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2811 return drm_fixp2int_ceil(peak_kbps);
2813 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2815 static int test_calc_pbn_mode(void)
2818 ret = drm_dp_calc_pbn_mode(154000, 30);
2820 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2821 154000, 30, 689, ret);
2824 ret = drm_dp_calc_pbn_mode(234000, 30);
2826 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2827 234000, 30, 1047, ret);
2830 ret = drm_dp_calc_pbn_mode(297000, 24);
2832 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2833 297000, 24, 1063, ret);
2839 /* we want to kick the TX after we've ack the up/down IRQs. */
2840 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2842 queue_work(system_long_wq, &mgr->tx_work);
2845 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2846 struct drm_dp_mst_branch *mstb)
2848 struct drm_dp_mst_port *port;
2849 int tabs = mstb->lct;
2853 for (i = 0; i < tabs; i++)
2857 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2858 list_for_each_entry(port, &mstb->ports, next) {
2859 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);
2861 drm_dp_mst_dump_mstb(m, port->mstb);
2865 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2870 for (i = 0; i < 64; i += 16) {
2871 if (drm_dp_dpcd_read(mgr->aux,
2872 DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
2879 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2880 struct drm_dp_mst_port *port, char *name,
2883 struct edid *mst_edid;
2885 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2886 drm_edid_get_monitor_name(mst_edid, name, namelen);
2890 * drm_dp_mst_dump_topology(): dump topology to seq file.
2891 * @m: seq_file to dump output to
2892 * @mgr: manager to dump current topology for.
2894 * helper to dump MST topology to a seq file for debugfs.
2896 void drm_dp_mst_dump_topology(struct seq_file *m,
2897 struct drm_dp_mst_topology_mgr *mgr)
2900 struct drm_dp_mst_port *port;
2902 mutex_lock(&mgr->lock);
2903 if (mgr->mst_primary)
2904 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2907 mutex_unlock(&mgr->lock);
2909 mutex_lock(&mgr->payload_lock);
2910 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2913 for (i = 0; i < mgr->max_payloads; i++) {
2914 if (mgr->proposed_vcpis[i]) {
2917 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2918 fetch_monitor_name(mgr, port, name, sizeof(name));
2919 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2920 port->port_num, port->vcpi.vcpi,
2921 port->vcpi.num_slots,
2922 (*name != 0) ? name : "Unknown");
2924 seq_printf(m, "vcpi %d:unused\n", i);
2926 for (i = 0; i < mgr->max_payloads; i++) {
2927 seq_printf(m, "payload %d: %d, %d, %d\n",
2929 mgr->payloads[i].payload_state,
2930 mgr->payloads[i].start_slot,
2931 mgr->payloads[i].num_slots);
2935 mutex_unlock(&mgr->payload_lock);
2937 mutex_lock(&mgr->lock);
2938 if (mgr->mst_primary) {
2942 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2943 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
2944 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2945 seq_printf(m, "faux/mst: %*ph\n", 2, buf);
2946 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2947 seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
2949 /* dump the standard OUI branch header */
2950 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2951 seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
2952 for (i = 0x3; i < 0x8 && buf[i]; i++)
2953 seq_printf(m, "%c", buf[i]);
2954 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
2955 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2956 if (dump_dp_payload_table(mgr, buf))
2957 seq_printf(m, "payload table: %*ph\n", 63, buf);
2961 mutex_unlock(&mgr->lock);
2964 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2966 static void drm_dp_tx_work(struct work_struct *work)
2968 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2970 mutex_lock(&mgr->qlock);
2971 if (!list_empty(&mgr->tx_msg_downq))
2972 process_single_down_tx_qlock(mgr);
2973 mutex_unlock(&mgr->qlock);
2976 static void drm_dp_free_mst_port(struct kref *kref)
2978 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2979 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2983 static void drm_dp_destroy_connector_work(struct work_struct *work)
2985 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
2986 struct drm_dp_mst_port *port;
2987 bool send_hotplug = false;
2989 * Not a regular list traverse as we have to drop the destroy
2990 * connector lock before destroying the connector, to avoid AB->BA
2991 * ordering between this lock and the config mutex.
2994 mutex_lock(&mgr->destroy_connector_lock);
2995 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2997 mutex_unlock(&mgr->destroy_connector_lock);
3000 list_del(&port->next);
3001 mutex_unlock(&mgr->destroy_connector_lock);
3003 kref_init(&port->kref);
3004 INIT_LIST_HEAD(&port->next);
3006 mgr->cbs->destroy_connector(mgr, port->connector);
3008 drm_dp_port_teardown_pdt(port, port->pdt);
3009 port->pdt = DP_PEER_DEVICE_NONE;
3011 if (!port->input && port->vcpi.vcpi > 0) {
3012 drm_dp_mst_reset_vcpi_slots(mgr, port);
3013 drm_dp_update_payload_part1(mgr);
3014 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
3017 kref_put(&port->kref, drm_dp_free_mst_port);
3018 send_hotplug = true;
3021 (*mgr->cbs->hotplug)(mgr);
3024 static struct drm_private_state *
3025 drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
3027 struct drm_dp_mst_topology_state *state;
3029 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
3033 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
3035 return &state->base;
3038 static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
3039 struct drm_private_state *state)
3041 struct drm_dp_mst_topology_state *mst_state =
3042 to_dp_mst_topology_state(state);
3047 static const struct drm_private_state_funcs mst_state_funcs = {
3048 .atomic_duplicate_state = drm_dp_mst_duplicate_state,
3049 .atomic_destroy_state = drm_dp_mst_destroy_state,
3053 * drm_atomic_get_mst_topology_state: get MST topology state
3055 * @state: global atomic state
3056 * @mgr: MST topology manager, also the private object in this case
3058 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3059 * state vtable so that the private object state returned is that of a MST
3060 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3061 * to care of the locking, so warn if don't hold the connection_mutex.
3065 * The MST topology state or error pointer.
3067 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3068 struct drm_dp_mst_topology_mgr *mgr)
3070 struct drm_device *dev = mgr->dev;
3072 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
3073 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
3075 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3078 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3079 * @mgr: manager struct to initialise
3080 * @dev: device providing this structure - for i2c addition.
3081 * @aux: DP helper aux channel to talk to this device
3082 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3083 * @max_payloads: maximum number of payloads this GPU can source
3084 * @conn_base_id: the connector object ID the MST device is connected to.
3086 * Return 0 for success, or negative error code on failure
3088 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
3089 struct drm_device *dev, struct drm_dp_aux *aux,
3090 int max_dpcd_transaction_bytes,
3091 int max_payloads, int conn_base_id)
3093 struct drm_dp_mst_topology_state *mst_state;
3095 mutex_init(&mgr->lock);
3096 mutex_init(&mgr->qlock);
3097 mutex_init(&mgr->payload_lock);
3098 mutex_init(&mgr->destroy_connector_lock);
3099 INIT_LIST_HEAD(&mgr->tx_msg_downq);
3100 INIT_LIST_HEAD(&mgr->destroy_connector_list);
3101 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3102 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
3103 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
3104 init_waitqueue_head(&mgr->tx_waitq);
3107 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3108 mgr->max_payloads = max_payloads;
3109 mgr->conn_base_id = conn_base_id;
3110 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3111 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3113 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3116 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3117 if (!mgr->proposed_vcpis)
3119 set_bit(0, &mgr->payload_mask);
3120 if (test_calc_pbn_mode() < 0)
3121 DRM_ERROR("MST PBN self-test failed\n");
3123 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
3124 if (mst_state == NULL)
3127 mst_state->mgr = mgr;
3129 /* max. time slots - one slot for MTP header */
3130 mst_state->avail_slots = 63;
3132 drm_atomic_private_obj_init(&mgr->base,
3138 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3141 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3142 * @mgr: manager to destroy
3144 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3146 flush_work(&mgr->work);
3147 flush_work(&mgr->destroy_connector_work);
3148 mutex_lock(&mgr->payload_lock);
3149 kfree(mgr->payloads);
3150 mgr->payloads = NULL;
3151 kfree(mgr->proposed_vcpis);
3152 mgr->proposed_vcpis = NULL;
3153 mutex_unlock(&mgr->payload_lock);
3156 drm_atomic_private_obj_fini(&mgr->base);
3159 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3162 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3165 struct drm_dp_aux *aux = adapter->algo_data;
3166 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3167 struct drm_dp_mst_branch *mstb;
3168 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3170 bool reading = false;
3171 struct drm_dp_sideband_msg_req_body msg;
3172 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3175 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3179 /* construct i2c msg */
3180 /* see if last msg is a read */
3181 if (msgs[num - 1].flags & I2C_M_RD)
3184 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3185 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3190 memset(&msg, 0, sizeof(msg));
3191 msg.req_type = DP_REMOTE_I2C_READ;
3192 msg.u.i2c_read.num_transactions = num - 1;
3193 msg.u.i2c_read.port_number = port->port_num;
3194 for (i = 0; i < num - 1; i++) {
3195 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3196 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3197 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3199 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3200 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3202 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3209 drm_dp_encode_sideband_req(&msg, txmsg);
3211 drm_dp_queue_down_tx(mgr, txmsg);
3213 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3216 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3220 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3224 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3229 drm_dp_put_mst_branch_device(mstb);
3233 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3235 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3236 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3237 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3238 I2C_FUNC_10BIT_ADDR;
3241 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3242 .functionality = drm_dp_mst_i2c_functionality,
3243 .master_xfer = drm_dp_mst_i2c_xfer,
3247 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3248 * @aux: DisplayPort AUX channel
3250 * Returns 0 on success or a negative error code on failure.
3252 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3254 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3255 aux->ddc.algo_data = aux;
3256 aux->ddc.retries = 3;
3258 aux->ddc.class = I2C_CLASS_DDC;
3259 aux->ddc.owner = THIS_MODULE;
3260 aux->ddc.dev.parent = aux->dev;
3261 aux->ddc.dev.of_node = aux->dev->of_node;
3263 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3264 sizeof(aux->ddc.name));
3266 return i2c_add_adapter(&aux->ddc);
3270 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3271 * @aux: DisplayPort AUX channel
3273 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3275 i2c_del_adapter(&aux->ddc);