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>
32 #include <linux/iopoll.h>
34 #include <drm/drm_fixed.h>
39 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
40 * protocol. The helpers contain a topology manager and bandwidth manager.
41 * The helpers encapsulate the sending and received of sideband msgs.
43 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
45 static int test_calc_pbn_mode(void);
47 static void drm_dp_put_port(struct drm_dp_mst_port *port);
49 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
51 struct drm_dp_payload *payload);
53 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
54 struct drm_dp_mst_port *port,
55 int offset, int size, u8 *bytes);
57 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
58 struct drm_dp_mst_branch *mstb);
59 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
60 struct drm_dp_mst_branch *mstb,
61 struct drm_dp_mst_port *port);
62 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
65 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
66 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
67 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
68 /* sideband msg handling */
69 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
74 int number_of_bits = num_nibbles * 4;
77 while (number_of_bits != 0) {
80 remainder |= (data[array_index] & bitmask) >> bitshift;
88 if ((remainder & 0x10) == 0x10)
93 while (number_of_bits != 0) {
96 if ((remainder & 0x10) != 0)
103 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
108 int number_of_bits = number_of_bytes * 8;
111 while (number_of_bits != 0) {
114 remainder |= (data[array_index] & bitmask) >> bitshift;
122 if ((remainder & 0x100) == 0x100)
127 while (number_of_bits != 0) {
130 if ((remainder & 0x100) != 0)
134 return remainder & 0xff;
136 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
139 size += (hdr->lct / 2);
143 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
149 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
150 for (i = 0; i < (hdr->lct / 2); i++)
151 buf[idx++] = hdr->rad[i];
152 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
153 (hdr->msg_len & 0x3f);
154 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
156 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
157 buf[idx - 1] |= (crc4 & 0xf);
162 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
163 u8 *buf, int buflen, u8 *hdrlen)
172 len += ((buf[0] & 0xf0) >> 4) / 2;
175 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
177 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
178 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
182 hdr->lct = (buf[0] & 0xf0) >> 4;
183 hdr->lcr = (buf[0] & 0xf);
185 for (i = 0; i < (hdr->lct / 2); i++)
186 hdr->rad[i] = buf[idx++];
187 hdr->broadcast = (buf[idx] >> 7) & 0x1;
188 hdr->path_msg = (buf[idx] >> 6) & 0x1;
189 hdr->msg_len = buf[idx] & 0x3f;
191 hdr->somt = (buf[idx] >> 7) & 0x1;
192 hdr->eomt = (buf[idx] >> 6) & 0x1;
193 hdr->seqno = (buf[idx] >> 4) & 0x1;
199 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
200 struct drm_dp_sideband_msg_tx *raw)
205 buf[idx++] = req->req_type & 0x7f;
207 switch (req->req_type) {
208 case DP_ENUM_PATH_RESOURCES:
209 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
212 case DP_ALLOCATE_PAYLOAD:
213 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
214 (req->u.allocate_payload.number_sdp_streams & 0xf);
216 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
218 buf[idx] = (req->u.allocate_payload.pbn >> 8);
220 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
222 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
223 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
224 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
227 if (req->u.allocate_payload.number_sdp_streams & 1) {
228 i = req->u.allocate_payload.number_sdp_streams - 1;
229 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
233 case DP_QUERY_PAYLOAD:
234 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
236 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
239 case DP_REMOTE_DPCD_READ:
240 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
241 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
243 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
245 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
247 buf[idx] = (req->u.dpcd_read.num_bytes);
251 case DP_REMOTE_DPCD_WRITE:
252 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
253 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
255 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
257 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
259 buf[idx] = (req->u.dpcd_write.num_bytes);
261 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
262 idx += req->u.dpcd_write.num_bytes;
264 case DP_REMOTE_I2C_READ:
265 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
266 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
268 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
269 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
271 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
273 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
274 idx += req->u.i2c_read.transactions[i].num_bytes;
276 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4;
277 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
280 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
282 buf[idx] = (req->u.i2c_read.num_bytes_read);
286 case DP_REMOTE_I2C_WRITE:
287 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
289 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
291 buf[idx] = (req->u.i2c_write.num_bytes);
293 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
294 idx += req->u.i2c_write.num_bytes;
300 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
303 crc4 = drm_dp_msg_data_crc4(msg, len);
307 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
308 struct drm_dp_sideband_msg_tx *raw)
313 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
318 /* this adds a chunk of msg to the builder to get the final msg */
319 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
320 u8 *replybuf, u8 replybuflen, bool hdr)
327 struct drm_dp_sideband_msg_hdr recv_hdr;
328 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
330 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
335 * ignore out-of-order messages or messages that are part of a
338 if (!recv_hdr.somt && !msg->have_somt)
341 /* get length contained in this portion */
342 msg->curchunk_len = recv_hdr.msg_len;
343 msg->curchunk_hdrlen = hdrlen;
345 /* we have already gotten an somt - don't bother parsing */
346 if (recv_hdr.somt && msg->have_somt)
350 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
351 msg->have_somt = true;
354 msg->have_eomt = true;
356 /* copy the bytes for the remainder of this header chunk */
357 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
358 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
360 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
361 msg->curchunk_idx += replybuflen;
364 if (msg->curchunk_idx >= msg->curchunk_len) {
366 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
367 /* copy chunk into bigger msg */
368 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
369 msg->curlen += msg->curchunk_len - 1;
374 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
375 struct drm_dp_sideband_msg_reply_body *repmsg)
379 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
381 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
383 if (idx > raw->curlen)
385 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
386 if (raw->msg[idx] & 0x80)
387 repmsg->u.link_addr.ports[i].input_port = 1;
389 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
390 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
393 if (idx > raw->curlen)
395 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
396 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
397 if (repmsg->u.link_addr.ports[i].input_port == 0)
398 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
400 if (idx > raw->curlen)
402 if (repmsg->u.link_addr.ports[i].input_port == 0) {
403 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
405 if (idx > raw->curlen)
407 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
409 if (idx > raw->curlen)
411 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
412 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
416 if (idx > raw->curlen)
422 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
426 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
427 struct drm_dp_sideband_msg_reply_body *repmsg)
430 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
432 if (idx > raw->curlen)
434 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 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX ||
757 txmsg->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(&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);
1046 port->mstb->mgr = port->mgr;
1047 port->mstb->port_parent = port;
1056 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1060 memcpy(mstb->guid, guid, 16);
1062 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1063 if (mstb->port_parent) {
1064 ret = drm_dp_send_dpcd_write(
1072 ret = drm_dp_dpcd_write(
1081 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1084 size_t proppath_size)
1088 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1089 for (i = 0; i < (mstb->lct - 1); i++) {
1090 int shift = (i % 2) ? 0 : 4;
1091 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1092 snprintf(temp, sizeof(temp), "-%d", port_num);
1093 strlcat(proppath, temp, proppath_size);
1095 snprintf(temp, sizeof(temp), "-%d", pnum);
1096 strlcat(proppath, temp, proppath_size);
1099 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1101 struct drm_dp_link_addr_reply_port *port_msg)
1103 struct drm_dp_mst_port *port;
1105 bool created = false;
1108 port = drm_dp_get_port(mstb, port_msg->port_number);
1110 port = kzalloc(sizeof(*port), GFP_KERNEL);
1113 kref_init(&port->kref);
1114 port->parent = mstb;
1115 port->port_num = port_msg->port_number;
1116 port->mgr = mstb->mgr;
1117 port->aux.name = "DPMST";
1118 port->aux.dev = dev;
1121 old_pdt = port->pdt;
1122 old_ddps = port->ddps;
1125 port->pdt = port_msg->peer_device_type;
1126 port->input = port_msg->input_port;
1127 port->mcs = port_msg->mcs;
1128 port->ddps = port_msg->ddps;
1129 port->ldps = port_msg->legacy_device_plug_status;
1130 port->dpcd_rev = port_msg->dpcd_revision;
1131 port->num_sdp_streams = port_msg->num_sdp_streams;
1132 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1134 /* manage mstb port lists with mgr lock - take a reference
1137 mutex_lock(&mstb->mgr->lock);
1138 kref_get(&port->kref);
1139 list_add(&port->next, &mstb->ports);
1140 mutex_unlock(&mstb->mgr->lock);
1143 if (old_ddps != port->ddps) {
1146 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1148 port->available_pbn = 0;
1152 if (old_pdt != port->pdt && !port->input) {
1153 drm_dp_port_teardown_pdt(port, old_pdt);
1155 ret = drm_dp_port_setup_pdt(port);
1157 drm_dp_send_link_address(mstb->mgr, port->mstb);
1160 if (created && !port->input) {
1163 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1164 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1165 if (!port->connector) {
1166 /* remove it from the port list */
1167 mutex_lock(&mstb->mgr->lock);
1168 list_del(&port->next);
1169 mutex_unlock(&mstb->mgr->lock);
1170 /* drop port list reference */
1171 drm_dp_put_port(port);
1174 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1175 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1176 port->port_num >= DP_MST_LOGICAL_PORT_0) {
1177 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1178 drm_mode_connector_set_tile_property(port->connector);
1180 (*mstb->mgr->cbs->register_connector)(port->connector);
1184 /* put reference to this port */
1185 drm_dp_put_port(port);
1188 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1189 struct drm_dp_connection_status_notify *conn_stat)
1191 struct drm_dp_mst_port *port;
1194 bool dowork = false;
1195 port = drm_dp_get_port(mstb, conn_stat->port_number);
1199 old_ddps = port->ddps;
1200 old_pdt = port->pdt;
1201 port->pdt = conn_stat->peer_device_type;
1202 port->mcs = conn_stat->message_capability_status;
1203 port->ldps = conn_stat->legacy_device_plug_status;
1204 port->ddps = conn_stat->displayport_device_plug_status;
1206 if (old_ddps != port->ddps) {
1210 port->available_pbn = 0;
1213 if (old_pdt != port->pdt && !port->input) {
1214 drm_dp_port_teardown_pdt(port, old_pdt);
1216 if (drm_dp_port_setup_pdt(port))
1220 drm_dp_put_port(port);
1222 queue_work(system_long_wq, &mstb->mgr->work);
1226 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1229 struct drm_dp_mst_branch *mstb;
1230 struct drm_dp_mst_port *port;
1232 /* find the port by iterating down */
1234 mutex_lock(&mgr->lock);
1235 mstb = mgr->mst_primary;
1240 for (i = 0; i < lct - 1; i++) {
1241 int shift = (i % 2) ? 0 : 4;
1242 int port_num = (rad[i / 2] >> shift) & 0xf;
1244 list_for_each_entry(port, &mstb->ports, next) {
1245 if (port->port_num == port_num) {
1248 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1256 kref_get(&mstb->kref);
1258 mutex_unlock(&mgr->lock);
1262 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1263 struct drm_dp_mst_branch *mstb,
1266 struct drm_dp_mst_branch *found_mstb;
1267 struct drm_dp_mst_port *port;
1269 if (memcmp(mstb->guid, guid, 16) == 0)
1273 list_for_each_entry(port, &mstb->ports, next) {
1277 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1286 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1287 struct drm_dp_mst_topology_mgr *mgr,
1290 struct drm_dp_mst_branch *mstb;
1292 /* find the port by iterating down */
1293 mutex_lock(&mgr->lock);
1295 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1298 kref_get(&mstb->kref);
1300 mutex_unlock(&mgr->lock);
1304 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1305 struct drm_dp_mst_branch *mstb)
1307 struct drm_dp_mst_port *port;
1308 struct drm_dp_mst_branch *mstb_child;
1309 if (!mstb->link_address_sent)
1310 drm_dp_send_link_address(mgr, mstb);
1312 list_for_each_entry(port, &mstb->ports, next) {
1319 if (!port->available_pbn)
1320 drm_dp_send_enum_path_resources(mgr, mstb, port);
1323 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1325 drm_dp_check_and_send_link_address(mgr, mstb_child);
1326 drm_dp_put_mst_branch_device(mstb_child);
1332 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1334 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1335 struct drm_dp_mst_branch *mstb;
1337 mutex_lock(&mgr->lock);
1338 mstb = mgr->mst_primary;
1340 kref_get(&mstb->kref);
1342 mutex_unlock(&mgr->lock);
1344 drm_dp_check_and_send_link_address(mgr, mstb);
1345 drm_dp_put_mst_branch_device(mstb);
1349 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1352 static u8 zero_guid[16];
1354 if (!memcmp(guid, zero_guid, 16)) {
1355 u64 salt = get_jiffies_64();
1356 memcpy(&guid[0], &salt, sizeof(u64));
1357 memcpy(&guid[8], &salt, sizeof(u64));
1364 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1366 struct drm_dp_sideband_msg_req_body req;
1368 req.req_type = DP_REMOTE_DPCD_READ;
1369 req.u.dpcd_read.port_number = port_num;
1370 req.u.dpcd_read.dpcd_address = offset;
1371 req.u.dpcd_read.num_bytes = num_bytes;
1372 drm_dp_encode_sideband_req(&req, msg);
1378 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1379 bool up, u8 *msg, int len)
1382 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1383 int tosend, total, offset;
1390 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1392 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1395 if (ret != tosend) {
1396 if (ret == -EIO && retries < 5) {
1400 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1406 } while (total > 0);
1410 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1411 struct drm_dp_sideband_msg_tx *txmsg)
1413 struct drm_dp_mst_branch *mstb = txmsg->dst;
1416 /* both msg slots are full */
1417 if (txmsg->seqno == -1) {
1418 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1419 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1422 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1423 txmsg->seqno = mstb->last_seqno;
1424 mstb->last_seqno ^= 1;
1425 } else if (mstb->tx_slots[0] == NULL)
1429 mstb->tx_slots[txmsg->seqno] = txmsg;
1432 req_type = txmsg->msg[0] & 0x7f;
1433 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1434 req_type == DP_RESOURCE_STATUS_NOTIFY)
1438 hdr->path_msg = txmsg->path_msg;
1439 hdr->lct = mstb->lct;
1440 hdr->lcr = mstb->lct - 1;
1442 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1443 hdr->seqno = txmsg->seqno;
1447 * process a single block of the next message in the sideband queue
1449 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1450 struct drm_dp_sideband_msg_tx *txmsg,
1454 struct drm_dp_sideband_msg_hdr hdr;
1455 int len, space, idx, tosend;
1458 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1460 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1462 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1465 /* make hdr from dst mst - for replies use seqno
1466 otherwise assign one */
1467 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1471 /* amount left to send in this message */
1472 len = txmsg->cur_len - txmsg->cur_offset;
1474 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1475 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1477 tosend = min(len, space);
1478 if (len == txmsg->cur_len)
1484 hdr.msg_len = tosend + 1;
1485 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1486 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1487 /* add crc at end */
1488 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1491 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1493 DRM_DEBUG_KMS("sideband msg failed to send\n");
1497 txmsg->cur_offset += tosend;
1498 if (txmsg->cur_offset == txmsg->cur_len) {
1499 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1505 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1507 struct drm_dp_sideband_msg_tx *txmsg;
1510 WARN_ON(!mutex_is_locked(&mgr->qlock));
1512 /* construct a chunk from the first msg in the tx_msg queue */
1513 if (list_empty(&mgr->tx_msg_downq))
1516 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1517 ret = process_single_tx_qlock(mgr, txmsg, false);
1519 /* txmsg is sent it should be in the slots now */
1520 list_del(&txmsg->next);
1522 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1523 list_del(&txmsg->next);
1524 if (txmsg->seqno != -1)
1525 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1526 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1527 wake_up(&mgr->tx_waitq);
1531 /* called holding qlock */
1532 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1533 struct drm_dp_sideband_msg_tx *txmsg)
1537 /* construct a chunk from the first msg in the tx_msg queue */
1538 ret = process_single_tx_qlock(mgr, txmsg, true);
1541 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1543 if (txmsg->seqno != -1) {
1544 WARN_ON((unsigned int)txmsg->seqno >
1545 ARRAY_SIZE(txmsg->dst->tx_slots));
1546 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1550 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1551 struct drm_dp_sideband_msg_tx *txmsg)
1553 mutex_lock(&mgr->qlock);
1554 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1555 if (list_is_singular(&mgr->tx_msg_downq))
1556 process_single_down_tx_qlock(mgr);
1557 mutex_unlock(&mgr->qlock);
1560 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1561 struct drm_dp_mst_branch *mstb)
1564 struct drm_dp_sideband_msg_tx *txmsg;
1567 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1572 len = build_link_address(txmsg);
1574 mstb->link_address_sent = true;
1575 drm_dp_queue_down_tx(mgr, txmsg);
1577 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1581 if (txmsg->reply.reply_type == 1)
1582 DRM_DEBUG_KMS("link address nak received\n");
1584 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1585 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1586 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,
1587 txmsg->reply.u.link_addr.ports[i].input_port,
1588 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1589 txmsg->reply.u.link_addr.ports[i].port_number,
1590 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1591 txmsg->reply.u.link_addr.ports[i].mcs,
1592 txmsg->reply.u.link_addr.ports[i].ddps,
1593 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1594 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1595 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1598 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1600 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1601 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1603 (*mgr->cbs->hotplug)(mgr);
1606 mstb->link_address_sent = false;
1607 DRM_DEBUG_KMS("link address failed %d\n", ret);
1613 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1614 struct drm_dp_mst_branch *mstb,
1615 struct drm_dp_mst_port *port)
1618 struct drm_dp_sideband_msg_tx *txmsg;
1621 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1626 len = build_enum_path_resources(txmsg, port->port_num);
1628 drm_dp_queue_down_tx(mgr, txmsg);
1630 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1632 if (txmsg->reply.reply_type == 1)
1633 DRM_DEBUG_KMS("enum path resources nak received\n");
1635 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1636 DRM_ERROR("got incorrect port in response\n");
1637 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,
1638 txmsg->reply.u.path_resources.avail_payload_bw_number);
1639 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1647 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1649 if (!mstb->port_parent)
1652 if (mstb->port_parent->mstb != mstb)
1653 return mstb->port_parent;
1655 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1658 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1659 struct drm_dp_mst_branch *mstb,
1662 struct drm_dp_mst_branch *rmstb = NULL;
1663 struct drm_dp_mst_port *found_port;
1664 mutex_lock(&mgr->lock);
1665 if (mgr->mst_primary) {
1666 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1669 rmstb = found_port->parent;
1670 kref_get(&rmstb->kref);
1671 *port_num = found_port->port_num;
1674 mutex_unlock(&mgr->lock);
1678 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1679 struct drm_dp_mst_port *port,
1683 struct drm_dp_sideband_msg_tx *txmsg;
1684 struct drm_dp_mst_branch *mstb;
1685 int len, ret, port_num;
1686 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1689 port = drm_dp_get_validated_port_ref(mgr, port);
1693 port_num = port->port_num;
1694 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1696 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1699 drm_dp_put_port(port);
1704 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1710 for (i = 0; i < port->num_sdp_streams; i++)
1714 len = build_allocate_payload(txmsg, port_num,
1716 pbn, port->num_sdp_streams, sinks);
1718 drm_dp_queue_down_tx(mgr, txmsg);
1720 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1722 if (txmsg->reply.reply_type == 1) {
1729 drm_dp_put_mst_branch_device(mstb);
1730 drm_dp_put_port(port);
1734 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1736 struct drm_dp_payload *payload)
1740 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1742 payload->payload_state = 0;
1745 payload->payload_state = DP_PAYLOAD_LOCAL;
1749 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1750 struct drm_dp_mst_port *port,
1752 struct drm_dp_payload *payload)
1755 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1758 payload->payload_state = DP_PAYLOAD_REMOTE;
1762 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1763 struct drm_dp_mst_port *port,
1765 struct drm_dp_payload *payload)
1767 DRM_DEBUG_KMS("\n");
1768 /* its okay for these to fail */
1770 drm_dp_payload_send_msg(mgr, port, id, 0);
1773 drm_dp_dpcd_write_payload(mgr, id, payload);
1774 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1778 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1780 struct drm_dp_payload *payload)
1782 payload->payload_state = 0;
1787 * drm_dp_update_payload_part1() - Execute payload update part 1
1788 * @mgr: manager to use.
1790 * This iterates over all proposed virtual channels, and tries to
1791 * allocate space in the link for them. For 0->slots transitions,
1792 * this step just writes the VCPI to the MST device. For slots->0
1793 * transitions, this writes the updated VCPIs and removes the
1794 * remote VC payloads.
1796 * after calling this the driver should generate ACT and payload
1799 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1803 struct drm_dp_payload req_payload;
1804 struct drm_dp_mst_port *port;
1806 mutex_lock(&mgr->payload_lock);
1807 for (i = 0; i < mgr->max_payloads; i++) {
1808 /* solve the current payloads - compare to the hw ones
1809 - update the hw view */
1810 req_payload.start_slot = cur_slots;
1811 if (mgr->proposed_vcpis[i]) {
1812 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1813 port = drm_dp_get_validated_port_ref(mgr, port);
1815 mutex_unlock(&mgr->payload_lock);
1818 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1819 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1822 req_payload.num_slots = 0;
1825 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1826 mgr->payloads[i].start_slot = req_payload.start_slot;
1828 /* work out what is required to happen with this payload */
1829 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1831 /* need to push an update for this payload */
1832 if (req_payload.num_slots) {
1833 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1834 mgr->payloads[i].num_slots = req_payload.num_slots;
1835 mgr->payloads[i].vcpi = req_payload.vcpi;
1836 } else if (mgr->payloads[i].num_slots) {
1837 mgr->payloads[i].num_slots = 0;
1838 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1839 req_payload.payload_state = mgr->payloads[i].payload_state;
1840 mgr->payloads[i].start_slot = 0;
1842 mgr->payloads[i].payload_state = req_payload.payload_state;
1844 cur_slots += req_payload.num_slots;
1847 drm_dp_put_port(port);
1850 for (i = 0; i < mgr->max_payloads; i++) {
1851 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1852 DRM_DEBUG_KMS("removing payload %d\n", i);
1853 for (j = i; j < mgr->max_payloads - 1; j++) {
1854 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1855 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1856 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1857 set_bit(j + 1, &mgr->payload_mask);
1859 clear_bit(j + 1, &mgr->payload_mask);
1862 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1863 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1864 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1868 mutex_unlock(&mgr->payload_lock);
1872 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1875 * drm_dp_update_payload_part2() - Execute payload update part 2
1876 * @mgr: manager to use.
1878 * This iterates over all proposed virtual channels, and tries to
1879 * allocate space in the link for them. For 0->slots transitions,
1880 * this step writes the remote VC payload commands. For slots->0
1881 * this just resets some internal state.
1883 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1885 struct drm_dp_mst_port *port;
1888 mutex_lock(&mgr->payload_lock);
1889 for (i = 0; i < mgr->max_payloads; i++) {
1891 if (!mgr->proposed_vcpis[i])
1894 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1896 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1897 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1898 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1899 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1900 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1903 mutex_unlock(&mgr->payload_lock);
1907 mutex_unlock(&mgr->payload_lock);
1910 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1912 #if 0 /* unused as of yet */
1913 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1914 struct drm_dp_mst_port *port,
1915 int offset, int size)
1918 struct drm_dp_sideband_msg_tx *txmsg;
1920 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1924 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1925 txmsg->dst = port->parent;
1927 drm_dp_queue_down_tx(mgr, txmsg);
1933 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1934 struct drm_dp_mst_port *port,
1935 int offset, int size, u8 *bytes)
1939 struct drm_dp_sideband_msg_tx *txmsg;
1940 struct drm_dp_mst_branch *mstb;
1942 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1946 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1952 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1955 drm_dp_queue_down_tx(mgr, txmsg);
1957 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1959 if (txmsg->reply.reply_type == 1) {
1966 drm_dp_put_mst_branch_device(mstb);
1970 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1972 struct drm_dp_sideband_msg_reply_body reply;
1974 reply.reply_type = 0;
1975 reply.req_type = req_type;
1976 drm_dp_encode_sideband_reply(&reply, msg);
1980 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1981 struct drm_dp_mst_branch *mstb,
1982 int req_type, int seqno, bool broadcast)
1984 struct drm_dp_sideband_msg_tx *txmsg;
1986 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1991 txmsg->seqno = seqno;
1992 drm_dp_encode_up_ack_reply(txmsg, req_type);
1994 mutex_lock(&mgr->qlock);
1996 process_single_up_tx_qlock(mgr, txmsg);
1998 mutex_unlock(&mgr->qlock);
2004 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
2008 switch (dp_link_bw) {
2010 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
2011 dp_link_bw, dp_link_count);
2014 case DP_LINK_BW_1_62:
2015 *out = 3 * dp_link_count;
2017 case DP_LINK_BW_2_7:
2018 *out = 5 * dp_link_count;
2020 case DP_LINK_BW_5_4:
2021 *out = 10 * dp_link_count;
2028 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2029 * @mgr: manager to set state for
2030 * @mst_state: true to enable MST on this connector - false to disable.
2032 * This is called by the driver when it detects an MST capable device plugged
2033 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2035 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2038 struct drm_dp_mst_branch *mstb = NULL;
2040 mutex_lock(&mgr->payload_lock);
2041 mutex_lock(&mgr->lock);
2042 if (mst_state == mgr->mst_state)
2045 mgr->mst_state = mst_state;
2046 /* set the device into MST mode */
2048 WARN_ON(mgr->mst_primary);
2051 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2052 if (ret != DP_RECEIVER_CAP_SIZE) {
2053 DRM_DEBUG_KMS("failed to read DPCD\n");
2057 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2058 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
2064 mgr->total_pbn = 2560;
2065 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div);
2066 mgr->avail_slots = mgr->total_slots;
2068 /* add initial branch device at LCT 1 */
2069 mstb = drm_dp_add_mst_branch_device(1, NULL);
2076 /* give this the main reference */
2077 mgr->mst_primary = mstb;
2078 kref_get(&mgr->mst_primary->kref);
2080 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2081 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2087 struct drm_dp_payload reset_pay;
2088 reset_pay.start_slot = 0;
2089 reset_pay.num_slots = 0x3f;
2090 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
2093 queue_work(system_long_wq, &mgr->work);
2097 /* disable MST on the device */
2098 mstb = mgr->mst_primary;
2099 mgr->mst_primary = NULL;
2100 /* this can fail if the device is gone */
2101 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
2103 memset(mgr->payloads, 0,
2104 mgr->max_payloads * sizeof(mgr->payloads[0]));
2105 memset(mgr->proposed_vcpis, 0,
2106 mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]));
2107 mgr->payload_mask = 0;
2108 set_bit(0, &mgr->payload_mask);
2113 mutex_unlock(&mgr->lock);
2114 mutex_unlock(&mgr->payload_lock);
2116 drm_dp_put_mst_branch_device(mstb);
2120 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
2123 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
2124 * @mgr: manager to suspend
2126 * This function tells the MST device that we can't handle UP messages
2127 * anymore. This should stop it from sending any since we are suspended.
2129 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
2131 mutex_lock(&mgr->lock);
2132 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2133 DP_MST_EN | DP_UPSTREAM_IS_SRC);
2134 mutex_unlock(&mgr->lock);
2135 flush_work(&mgr->work);
2136 flush_work(&mgr->destroy_connector_work);
2138 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
2141 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2142 * @mgr: manager to resume
2144 * This will fetch DPCD and see if the device is still there,
2145 * if it is, it will rewrite the MSTM control bits, and return.
2147 * if the device fails this returns -1, and the driver should do
2148 * a full MST reprobe, in case we were undocked.
2150 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
2154 mutex_lock(&mgr->lock);
2156 if (mgr->mst_primary) {
2160 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2161 if (sret != DP_RECEIVER_CAP_SIZE) {
2162 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2167 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
2168 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
2170 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2175 /* Some hubs forget their guids after they resume */
2176 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
2178 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2182 drm_dp_check_mstb_guid(mgr->mst_primary, guid);
2189 mutex_unlock(&mgr->lock);
2192 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
2194 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
2198 int replylen, origlen, curreply;
2200 struct drm_dp_sideband_msg_rx *msg;
2201 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
2202 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
2204 len = min(mgr->max_dpcd_transaction_bytes, 16);
2205 ret = drm_dp_dpcd_read(mgr->aux, basereg,
2208 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
2211 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
2213 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
2216 replylen = msg->curchunk_len + msg->curchunk_hdrlen;
2221 while (replylen > 0) {
2222 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
2223 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
2226 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
2231 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
2233 DRM_DEBUG_KMS("failed to build sideband msg\n");
2243 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
2247 if (!drm_dp_get_one_sb_msg(mgr, false)) {
2248 memset(&mgr->down_rep_recv, 0,
2249 sizeof(struct drm_dp_sideband_msg_rx));
2253 if (mgr->down_rep_recv.have_eomt) {
2254 struct drm_dp_sideband_msg_tx *txmsg;
2255 struct drm_dp_mst_branch *mstb;
2257 mstb = drm_dp_get_mst_branch_device(mgr,
2258 mgr->down_rep_recv.initial_hdr.lct,
2259 mgr->down_rep_recv.initial_hdr.rad);
2262 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
2263 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2267 /* find the message */
2268 slot = mgr->down_rep_recv.initial_hdr.seqno;
2269 mutex_lock(&mgr->qlock);
2270 txmsg = mstb->tx_slots[slot];
2271 /* remove from slots */
2272 mutex_unlock(&mgr->qlock);
2275 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2277 mgr->down_rep_recv.initial_hdr.seqno,
2278 mgr->down_rep_recv.initial_hdr.lct,
2279 mgr->down_rep_recv.initial_hdr.rad[0],
2280 mgr->down_rep_recv.msg[0]);
2281 drm_dp_put_mst_branch_device(mstb);
2282 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2286 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
2287 if (txmsg->reply.reply_type == 1) {
2288 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);
2291 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2292 drm_dp_put_mst_branch_device(mstb);
2294 mutex_lock(&mgr->qlock);
2295 txmsg->state = DRM_DP_SIDEBAND_TX_RX;
2296 mstb->tx_slots[slot] = NULL;
2297 mutex_unlock(&mgr->qlock);
2299 wake_up(&mgr->tx_waitq);
2304 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
2308 if (!drm_dp_get_one_sb_msg(mgr, true)) {
2309 memset(&mgr->up_req_recv, 0,
2310 sizeof(struct drm_dp_sideband_msg_rx));
2314 if (mgr->up_req_recv.have_eomt) {
2315 struct drm_dp_sideband_msg_req_body msg;
2316 struct drm_dp_mst_branch *mstb = NULL;
2319 if (!mgr->up_req_recv.initial_hdr.broadcast) {
2320 mstb = drm_dp_get_mst_branch_device(mgr,
2321 mgr->up_req_recv.initial_hdr.lct,
2322 mgr->up_req_recv.initial_hdr.rad);
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));
2330 seqno = mgr->up_req_recv.initial_hdr.seqno;
2331 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
2333 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
2334 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.conn_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_dp_update_port(mstb, &msg.u.conn_stat);
2347 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);
2348 (*mgr->cbs->hotplug)(mgr);
2350 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
2351 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
2353 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
2356 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
2357 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2361 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
2365 drm_dp_put_mst_branch_device(mstb);
2367 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
2373 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2374 * @mgr: manager to notify irq for.
2375 * @esi: 4 bytes from SINK_COUNT_ESI
2376 * @handled: whether the hpd interrupt was consumed or not
2378 * This should be called from the driver when it detects a short IRQ,
2379 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2380 * topology manager will process the sideband messages received as a result
2383 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
2390 if (sc != mgr->sink_count) {
2391 mgr->sink_count = sc;
2395 if (esi[1] & DP_DOWN_REP_MSG_RDY) {
2396 ret = drm_dp_mst_handle_down_rep(mgr);
2400 if (esi[1] & DP_UP_REQ_MSG_RDY) {
2401 ret |= drm_dp_mst_handle_up_req(mgr);
2405 drm_dp_mst_kick_tx(mgr);
2408 EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
2411 * drm_dp_mst_detect_port() - get connection status for an MST port
2412 * @connector: DRM connector for this port
2413 * @mgr: manager for this port
2414 * @port: unverified pointer to a port
2416 * This returns the current connection state for a port. It validates the
2417 * port pointer still exists so the caller doesn't require a reference
2419 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
2420 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2422 enum drm_connector_status status = connector_status_disconnected;
2424 /* we need to search for the port in the mgr in case its gone */
2425 port = drm_dp_get_validated_port_ref(mgr, port);
2427 return connector_status_disconnected;
2432 switch (port->pdt) {
2433 case DP_PEER_DEVICE_NONE:
2434 case DP_PEER_DEVICE_MST_BRANCHING:
2437 case DP_PEER_DEVICE_SST_SINK:
2438 status = connector_status_connected;
2439 /* for logical ports - cache the EDID */
2440 if (port->port_num >= 8 && !port->cached_edid) {
2441 port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
2444 case DP_PEER_DEVICE_DP_LEGACY_CONV:
2446 status = connector_status_connected;
2450 drm_dp_put_port(port);
2453 EXPORT_SYMBOL(drm_dp_mst_detect_port);
2456 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
2457 * @mgr: manager for this port
2458 * @port: unverified pointer to a port.
2460 * This returns whether the port supports audio or not.
2462 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
2463 struct drm_dp_mst_port *port)
2467 port = drm_dp_get_validated_port_ref(mgr, port);
2470 ret = port->has_audio;
2471 drm_dp_put_port(port);
2474 EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
2477 * drm_dp_mst_get_edid() - get EDID for an MST port
2478 * @connector: toplevel connector to get EDID for
2479 * @mgr: manager for this port
2480 * @port: unverified pointer to a port.
2482 * This returns an EDID for the port connected to a connector,
2483 * It validates the pointer still exists so the caller doesn't require a
2486 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2488 struct edid *edid = NULL;
2490 /* we need to search for the port in the mgr in case its gone */
2491 port = drm_dp_get_validated_port_ref(mgr, port);
2495 if (port->cached_edid)
2496 edid = drm_edid_duplicate(port->cached_edid);
2498 edid = drm_get_edid(connector, &port->aux.ddc);
2499 drm_mode_connector_set_tile_property(connector);
2501 port->has_audio = drm_detect_monitor_audio(edid);
2502 drm_dp_put_port(port);
2505 EXPORT_SYMBOL(drm_dp_mst_get_edid);
2508 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2509 * @mgr: manager to use
2510 * @pbn: payload bandwidth to convert into slots.
2512 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
2517 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2519 if (num_slots > mgr->avail_slots)
2523 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2525 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2526 struct drm_dp_vcpi *vcpi, int pbn)
2531 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2533 if (num_slots > mgr->avail_slots)
2537 vcpi->aligned_pbn = num_slots * mgr->pbn_div;
2538 vcpi->num_slots = num_slots;
2540 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2547 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2548 * @mgr: manager for this port
2549 * @port: port to allocate a virtual channel for.
2550 * @pbn: payload bandwidth number to request
2551 * @slots: returned number of slots for this PBN.
2553 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots)
2557 port = drm_dp_get_validated_port_ref(mgr, port);
2561 if (port->vcpi.vcpi > 0) {
2562 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2563 if (pbn == port->vcpi.pbn) {
2564 *slots = port->vcpi.num_slots;
2565 drm_dp_put_port(port);
2570 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn);
2572 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret);
2575 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots);
2576 *slots = port->vcpi.num_slots;
2578 drm_dp_put_port(port);
2583 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2585 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2588 port = drm_dp_get_validated_port_ref(mgr, port);
2592 slots = port->vcpi.num_slots;
2593 drm_dp_put_port(port);
2596 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2599 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2600 * @mgr: manager for this port
2601 * @port: unverified pointer to a port.
2603 * This just resets the number of slots for the ports VCPI for later programming.
2605 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2607 port = drm_dp_get_validated_port_ref(mgr, port);
2610 port->vcpi.num_slots = 0;
2611 drm_dp_put_port(port);
2613 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2616 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2617 * @mgr: manager for this port
2618 * @port: unverified port to deallocate vcpi for
2620 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2622 port = drm_dp_get_validated_port_ref(mgr, port);
2626 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2627 port->vcpi.num_slots = 0;
2629 port->vcpi.aligned_pbn = 0;
2630 port->vcpi.vcpi = 0;
2631 drm_dp_put_port(port);
2633 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2635 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2636 int id, struct drm_dp_payload *payload)
2638 u8 payload_alloc[3], status;
2642 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2643 DP_PAYLOAD_TABLE_UPDATED);
2645 payload_alloc[0] = id;
2646 payload_alloc[1] = payload->start_slot;
2647 payload_alloc[2] = payload->num_slots;
2649 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2651 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2656 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2658 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2662 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2665 usleep_range(10000, 20000);
2668 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2677 static int do_get_act_status(struct drm_dp_aux *aux)
2682 ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2690 * drm_dp_check_act_status() - Check ACT handled status.
2691 * @mgr: manager to use
2693 * Check the payload status bits in the DPCD for ACT handled completion.
2695 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2698 * There doesn't seem to be any recommended retry count or timeout in
2699 * the MST specification. Since some hubs have been observed to take
2700 * over 1 second to update their payload allocations under certain
2701 * conditions, we use a rather large timeout value.
2703 const int timeout_ms = 3000;
2706 ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,
2707 status & DP_PAYLOAD_ACT_HANDLED || status < 0,
2708 200, timeout_ms * USEC_PER_MSEC);
2709 if (ret < 0 && status >= 0) {
2710 DRM_DEBUG_KMS("Failed to get ACT after %dms, last status: %02x\n",
2711 timeout_ms, status);
2713 } else if (status < 0) {
2714 DRM_DEBUG_KMS("Failed to read payload table status: %d\n",
2721 EXPORT_SYMBOL(drm_dp_check_act_status);
2724 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2725 * @clock: dot clock for the mode
2726 * @bpp: bpp for the mode.
2728 * This uses the formula in the spec to calculate the PBN value for a mode.
2730 int drm_dp_calc_pbn_mode(int clock, int bpp)
2740 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2741 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2742 * common multiplier to render an integer PBN for all link rate/lane
2743 * counts combinations
2745 * peak_kbps *= (1006/1000)
2746 * peak_kbps *= (64/54)
2747 * peak_kbps *= 8 convert to bytes
2750 numerator = 64 * 1006;
2751 denominator = 54 * 8 * 1000 * 1000;
2754 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2756 return drm_fixp2int_ceil(peak_kbps);
2758 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2760 static int test_calc_pbn_mode(void)
2763 ret = drm_dp_calc_pbn_mode(154000, 30);
2765 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2766 154000, 30, 689, ret);
2769 ret = drm_dp_calc_pbn_mode(234000, 30);
2771 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2772 234000, 30, 1047, ret);
2775 ret = drm_dp_calc_pbn_mode(297000, 24);
2777 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2778 297000, 24, 1063, ret);
2784 /* we want to kick the TX after we've ack the up/down IRQs. */
2785 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2787 queue_work(system_long_wq, &mgr->tx_work);
2790 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2791 struct drm_dp_mst_branch *mstb)
2793 struct drm_dp_mst_port *port;
2794 int tabs = mstb->lct;
2798 for (i = 0; i < tabs; i++)
2802 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2803 list_for_each_entry(port, &mstb->ports, next) {
2804 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);
2806 drm_dp_mst_dump_mstb(m, port->mstb);
2810 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2815 for (i = 0; i < 4; i++) {
2816 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
2825 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2826 struct drm_dp_mst_port *port, char *name,
2829 struct edid *mst_edid;
2831 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2832 drm_edid_get_monitor_name(mst_edid, name, namelen);
2837 * drm_dp_mst_dump_topology(): dump topology to seq file.
2838 * @m: seq_file to dump output to
2839 * @mgr: manager to dump current topology for.
2841 * helper to dump MST topology to a seq file for debugfs.
2843 void drm_dp_mst_dump_topology(struct seq_file *m,
2844 struct drm_dp_mst_topology_mgr *mgr)
2847 struct drm_dp_mst_port *port;
2849 mutex_lock(&mgr->lock);
2850 if (mgr->mst_primary)
2851 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2854 mutex_unlock(&mgr->lock);
2856 mutex_lock(&mgr->payload_lock);
2857 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2860 for (i = 0; i < mgr->max_payloads; i++) {
2861 if (mgr->proposed_vcpis[i]) {
2864 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2865 fetch_monitor_name(mgr, port, name, sizeof(name));
2866 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2867 port->port_num, port->vcpi.vcpi,
2868 port->vcpi.num_slots,
2869 (*name != 0) ? name : "Unknown");
2871 seq_printf(m, "vcpi %d:unused\n", i);
2873 for (i = 0; i < mgr->max_payloads; i++) {
2874 seq_printf(m, "payload %d: %d, %d, %d\n",
2876 mgr->payloads[i].payload_state,
2877 mgr->payloads[i].start_slot,
2878 mgr->payloads[i].num_slots);
2882 mutex_unlock(&mgr->payload_lock);
2884 mutex_lock(&mgr->lock);
2885 if (mgr->mst_primary) {
2889 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2890 seq_printf(m, "dpcd: ");
2891 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
2892 seq_printf(m, "%02x ", buf[i]);
2893 seq_printf(m, "\n");
2894 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2895 seq_printf(m, "faux/mst: ");
2896 for (i = 0; i < 2; i++)
2897 seq_printf(m, "%02x ", buf[i]);
2898 seq_printf(m, "\n");
2899 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2900 seq_printf(m, "mst ctrl: ");
2901 for (i = 0; i < 1; i++)
2902 seq_printf(m, "%02x ", buf[i]);
2903 seq_printf(m, "\n");
2905 /* dump the standard OUI branch header */
2906 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2907 seq_printf(m, "branch oui: ");
2908 for (i = 0; i < 0x3; i++)
2909 seq_printf(m, "%02x", buf[i]);
2910 seq_printf(m, " devid: ");
2911 for (i = 0x3; i < 0x8 && buf[i]; i++)
2912 seq_printf(m, "%c", buf[i]);
2914 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2915 seq_printf(m, "\n");
2916 bret = dump_dp_payload_table(mgr, buf);
2918 seq_printf(m, "payload table: ");
2919 for (i = 0; i < 63; i++)
2920 seq_printf(m, "%02x ", buf[i]);
2921 seq_printf(m, "\n");
2926 mutex_unlock(&mgr->lock);
2929 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2931 static void drm_dp_tx_work(struct work_struct *work)
2933 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2935 mutex_lock(&mgr->qlock);
2936 if (!list_empty(&mgr->tx_msg_downq))
2937 process_single_down_tx_qlock(mgr);
2938 mutex_unlock(&mgr->qlock);
2941 static void drm_dp_free_mst_port(struct kref *kref)
2943 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
2944 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
2948 static void drm_dp_destroy_connector_work(struct work_struct *work)
2950 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
2951 struct drm_dp_mst_port *port;
2952 bool send_hotplug = false;
2954 * Not a regular list traverse as we have to drop the destroy
2955 * connector lock before destroying the connector, to avoid AB->BA
2956 * ordering between this lock and the config mutex.
2959 mutex_lock(&mgr->destroy_connector_lock);
2960 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
2962 mutex_unlock(&mgr->destroy_connector_lock);
2965 list_del(&port->next);
2966 mutex_unlock(&mgr->destroy_connector_lock);
2968 kref_init(&port->kref);
2969 INIT_LIST_HEAD(&port->next);
2971 mgr->cbs->destroy_connector(mgr, port->connector);
2973 drm_dp_port_teardown_pdt(port, port->pdt);
2974 port->pdt = DP_PEER_DEVICE_NONE;
2976 if (!port->input && port->vcpi.vcpi > 0) {
2977 drm_dp_mst_reset_vcpi_slots(mgr, port);
2978 drm_dp_update_payload_part1(mgr);
2979 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2982 kref_put(&port->kref, drm_dp_free_mst_port);
2983 send_hotplug = true;
2986 (*mgr->cbs->hotplug)(mgr);
2990 * drm_dp_mst_topology_mgr_init - initialise a topology manager
2991 * @mgr: manager struct to initialise
2992 * @dev: device providing this structure - for i2c addition.
2993 * @aux: DP helper aux channel to talk to this device
2994 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
2995 * @max_payloads: maximum number of payloads this GPU can source
2996 * @conn_base_id: the connector object ID the MST device is connected to.
2998 * Return 0 for success, or negative error code on failure
3000 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
3001 struct device *dev, struct drm_dp_aux *aux,
3002 int max_dpcd_transaction_bytes,
3003 int max_payloads, int conn_base_id)
3005 mutex_init(&mgr->lock);
3006 mutex_init(&mgr->qlock);
3007 mutex_init(&mgr->payload_lock);
3008 mutex_init(&mgr->destroy_connector_lock);
3009 INIT_LIST_HEAD(&mgr->tx_msg_downq);
3010 INIT_LIST_HEAD(&mgr->destroy_connector_list);
3011 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3012 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
3013 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
3014 init_waitqueue_head(&mgr->tx_waitq);
3017 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3018 mgr->max_payloads = max_payloads;
3019 mgr->conn_base_id = conn_base_id;
3020 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3021 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3023 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3026 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3027 if (!mgr->proposed_vcpis)
3029 set_bit(0, &mgr->payload_mask);
3030 if (test_calc_pbn_mode() < 0)
3031 DRM_ERROR("MST PBN self-test failed\n");
3035 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3038 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3039 * @mgr: manager to destroy
3041 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3043 flush_work(&mgr->work);
3044 flush_work(&mgr->destroy_connector_work);
3045 mutex_lock(&mgr->payload_lock);
3046 kfree(mgr->payloads);
3047 mgr->payloads = NULL;
3048 kfree(mgr->proposed_vcpis);
3049 mgr->proposed_vcpis = NULL;
3050 mutex_unlock(&mgr->payload_lock);
3054 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3057 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3060 struct drm_dp_aux *aux = adapter->algo_data;
3061 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3062 struct drm_dp_mst_branch *mstb;
3063 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3065 bool reading = false;
3066 struct drm_dp_sideband_msg_req_body msg;
3067 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3070 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3074 /* construct i2c msg */
3075 /* see if last msg is a read */
3076 if (msgs[num - 1].flags & I2C_M_RD)
3079 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3080 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3085 memset(&msg, 0, sizeof(msg));
3086 msg.req_type = DP_REMOTE_I2C_READ;
3087 msg.u.i2c_read.num_transactions = num - 1;
3088 msg.u.i2c_read.port_number = port->port_num;
3089 for (i = 0; i < num - 1; i++) {
3090 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3091 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3092 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3093 msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP);
3095 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3096 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3098 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3105 drm_dp_encode_sideband_req(&msg, txmsg);
3107 drm_dp_queue_down_tx(mgr, txmsg);
3109 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3112 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3116 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3120 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3125 drm_dp_put_mst_branch_device(mstb);
3129 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3131 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3132 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3133 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3134 I2C_FUNC_10BIT_ADDR;
3137 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3138 .functionality = drm_dp_mst_i2c_functionality,
3139 .master_xfer = drm_dp_mst_i2c_xfer,
3143 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3144 * @aux: DisplayPort AUX channel
3146 * Returns 0 on success or a negative error code on failure.
3148 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3150 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3151 aux->ddc.algo_data = aux;
3152 aux->ddc.retries = 3;
3154 aux->ddc.class = I2C_CLASS_DDC;
3155 aux->ddc.owner = THIS_MODULE;
3156 aux->ddc.dev.parent = aux->dev;
3157 aux->ddc.dev.of_node = aux->dev->of_node;
3159 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3160 sizeof(aux->ddc.name));
3162 return i2c_add_adapter(&aux->ddc);
3166 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3167 * @aux: DisplayPort AUX channel
3169 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3171 i2c_del_adapter(&aux->ddc);