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>
35 #include <drm/drm_atomic.h>
36 #include <drm/drm_atomic_helper.h>
41 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
42 * protocol. The helpers contain a topology manager and bandwidth manager.
43 * The helpers encapsulate the sending and received of sideband msgs.
45 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
47 static int test_calc_pbn_mode(void);
49 static void drm_dp_put_port(struct drm_dp_mst_port *port);
51 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
53 struct drm_dp_payload *payload);
55 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
56 struct drm_dp_mst_port *port,
57 int offset, int size, u8 *bytes);
59 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
60 struct drm_dp_mst_branch *mstb);
61 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
62 struct drm_dp_mst_branch *mstb,
63 struct drm_dp_mst_port *port);
64 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
67 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
68 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
69 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
70 /* sideband msg handling */
71 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
76 int number_of_bits = num_nibbles * 4;
79 while (number_of_bits != 0) {
82 remainder |= (data[array_index] & bitmask) >> bitshift;
90 if ((remainder & 0x10) == 0x10)
95 while (number_of_bits != 0) {
98 if ((remainder & 0x10) != 0)
105 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
110 int number_of_bits = number_of_bytes * 8;
113 while (number_of_bits != 0) {
116 remainder |= (data[array_index] & bitmask) >> bitshift;
124 if ((remainder & 0x100) == 0x100)
129 while (number_of_bits != 0) {
132 if ((remainder & 0x100) != 0)
136 return remainder & 0xff;
138 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
141 size += (hdr->lct / 2);
145 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
151 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
152 for (i = 0; i < (hdr->lct / 2); i++)
153 buf[idx++] = hdr->rad[i];
154 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
155 (hdr->msg_len & 0x3f);
156 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
158 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
159 buf[idx - 1] |= (crc4 & 0xf);
164 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
165 u8 *buf, int buflen, u8 *hdrlen)
174 len += ((buf[0] & 0xf0) >> 4) / 2;
177 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
179 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
180 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
184 hdr->lct = (buf[0] & 0xf0) >> 4;
185 hdr->lcr = (buf[0] & 0xf);
187 for (i = 0; i < (hdr->lct / 2); i++)
188 hdr->rad[i] = buf[idx++];
189 hdr->broadcast = (buf[idx] >> 7) & 0x1;
190 hdr->path_msg = (buf[idx] >> 6) & 0x1;
191 hdr->msg_len = buf[idx] & 0x3f;
193 hdr->somt = (buf[idx] >> 7) & 0x1;
194 hdr->eomt = (buf[idx] >> 6) & 0x1;
195 hdr->seqno = (buf[idx] >> 4) & 0x1;
201 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
202 struct drm_dp_sideband_msg_tx *raw)
207 buf[idx++] = req->req_type & 0x7f;
209 switch (req->req_type) {
210 case DP_ENUM_PATH_RESOURCES:
211 buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
214 case DP_ALLOCATE_PAYLOAD:
215 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
216 (req->u.allocate_payload.number_sdp_streams & 0xf);
218 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
220 buf[idx] = (req->u.allocate_payload.pbn >> 8);
222 buf[idx] = (req->u.allocate_payload.pbn & 0xff);
224 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
225 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
226 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
229 if (req->u.allocate_payload.number_sdp_streams & 1) {
230 i = req->u.allocate_payload.number_sdp_streams - 1;
231 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
235 case DP_QUERY_PAYLOAD:
236 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
238 buf[idx] = (req->u.query_payload.vcpi & 0x7f);
241 case DP_REMOTE_DPCD_READ:
242 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
243 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
245 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
247 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
249 buf[idx] = (req->u.dpcd_read.num_bytes);
253 case DP_REMOTE_DPCD_WRITE:
254 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
255 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
257 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
259 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
261 buf[idx] = (req->u.dpcd_write.num_bytes);
263 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
264 idx += req->u.dpcd_write.num_bytes;
266 case DP_REMOTE_I2C_READ:
267 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
268 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
270 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
271 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
273 buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
275 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
276 idx += req->u.i2c_read.transactions[i].num_bytes;
278 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4;
279 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
282 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
284 buf[idx] = (req->u.i2c_read.num_bytes_read);
288 case DP_REMOTE_I2C_WRITE:
289 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
291 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
293 buf[idx] = (req->u.i2c_write.num_bytes);
295 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
296 idx += req->u.i2c_write.num_bytes;
302 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
305 crc4 = drm_dp_msg_data_crc4(msg, len);
309 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
310 struct drm_dp_sideband_msg_tx *raw)
315 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
320 /* this adds a chunk of msg to the builder to get the final msg */
321 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
322 u8 *replybuf, u8 replybuflen, bool hdr)
329 struct drm_dp_sideband_msg_hdr recv_hdr;
330 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
332 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
337 * ignore out-of-order messages or messages that are part of a
340 if (!recv_hdr.somt && !msg->have_somt)
343 /* get length contained in this portion */
344 msg->curchunk_len = recv_hdr.msg_len;
345 msg->curchunk_hdrlen = hdrlen;
347 /* we have already gotten an somt - don't bother parsing */
348 if (recv_hdr.somt && msg->have_somt)
352 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
353 msg->have_somt = true;
356 msg->have_eomt = true;
358 /* copy the bytes for the remainder of this header chunk */
359 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
360 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
362 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
363 msg->curchunk_idx += replybuflen;
366 if (msg->curchunk_idx >= msg->curchunk_len) {
368 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
369 /* copy chunk into bigger msg */
370 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
371 msg->curlen += msg->curchunk_len - 1;
376 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
377 struct drm_dp_sideband_msg_reply_body *repmsg)
381 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
383 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
385 if (idx > raw->curlen)
387 for (i = 0; i < repmsg->u.link_addr.nports; i++) {
388 if (raw->msg[idx] & 0x80)
389 repmsg->u.link_addr.ports[i].input_port = 1;
391 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
392 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
395 if (idx > raw->curlen)
397 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
398 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
399 if (repmsg->u.link_addr.ports[i].input_port == 0)
400 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
402 if (idx > raw->curlen)
404 if (repmsg->u.link_addr.ports[i].input_port == 0) {
405 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
407 if (idx > raw->curlen)
409 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
411 if (idx > raw->curlen)
413 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
414 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
418 if (idx > raw->curlen)
424 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
428 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
429 struct drm_dp_sideband_msg_reply_body *repmsg)
432 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
434 if (idx > raw->curlen)
436 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
438 if (idx > raw->curlen)
441 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
444 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
448 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
449 struct drm_dp_sideband_msg_reply_body *repmsg)
452 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
454 if (idx > raw->curlen)
458 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
462 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
463 struct drm_dp_sideband_msg_reply_body *repmsg)
467 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
469 if (idx > raw->curlen)
471 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
474 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
477 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
481 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
482 struct drm_dp_sideband_msg_reply_body *repmsg)
485 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
487 if (idx > raw->curlen)
489 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
491 if (idx > raw->curlen)
493 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
495 if (idx > raw->curlen)
499 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
503 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
504 struct drm_dp_sideband_msg_reply_body *repmsg)
507 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
509 if (idx > raw->curlen)
511 repmsg->u.allocate_payload.vcpi = raw->msg[idx];
513 if (idx > raw->curlen)
515 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
517 if (idx > raw->curlen)
521 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
525 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
526 struct drm_dp_sideband_msg_reply_body *repmsg)
529 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
531 if (idx > raw->curlen)
533 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
535 if (idx > raw->curlen)
539 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
543 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
544 struct drm_dp_sideband_msg_reply_body *msg)
546 memset(msg, 0, sizeof(*msg));
547 msg->reply_type = (raw->msg[0] & 0x80) >> 7;
548 msg->req_type = (raw->msg[0] & 0x7f);
550 if (msg->reply_type) {
551 memcpy(msg->u.nak.guid, &raw->msg[1], 16);
552 msg->u.nak.reason = raw->msg[17];
553 msg->u.nak.nak_data = raw->msg[18];
557 switch (msg->req_type) {
558 case DP_LINK_ADDRESS:
559 return drm_dp_sideband_parse_link_address(raw, msg);
560 case DP_QUERY_PAYLOAD:
561 return drm_dp_sideband_parse_query_payload_ack(raw, msg);
562 case DP_REMOTE_DPCD_READ:
563 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
564 case DP_REMOTE_DPCD_WRITE:
565 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
566 case DP_REMOTE_I2C_READ:
567 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
568 case DP_ENUM_PATH_RESOURCES:
569 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
570 case DP_ALLOCATE_PAYLOAD:
571 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
573 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
578 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
579 struct drm_dp_sideband_msg_req_body *msg)
583 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
585 if (idx > raw->curlen)
588 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
590 if (idx > raw->curlen)
593 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
594 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
595 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
596 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
597 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
601 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
605 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
606 struct drm_dp_sideband_msg_req_body *msg)
610 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
612 if (idx > raw->curlen)
615 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
617 if (idx > raw->curlen)
620 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
624 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
628 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
629 struct drm_dp_sideband_msg_req_body *msg)
631 memset(msg, 0, sizeof(*msg));
632 msg->req_type = (raw->msg[0] & 0x7f);
634 switch (msg->req_type) {
635 case DP_CONNECTION_STATUS_NOTIFY:
636 return drm_dp_sideband_parse_connection_status_notify(raw, msg);
637 case DP_RESOURCE_STATUS_NOTIFY:
638 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
640 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
645 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
647 struct drm_dp_sideband_msg_req_body req;
649 req.req_type = DP_REMOTE_DPCD_WRITE;
650 req.u.dpcd_write.port_number = port_num;
651 req.u.dpcd_write.dpcd_address = offset;
652 req.u.dpcd_write.num_bytes = num_bytes;
653 req.u.dpcd_write.bytes = bytes;
654 drm_dp_encode_sideband_req(&req, msg);
659 static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
661 struct drm_dp_sideband_msg_req_body req;
663 req.req_type = DP_LINK_ADDRESS;
664 drm_dp_encode_sideband_req(&req, msg);
668 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
670 struct drm_dp_sideband_msg_req_body req;
672 req.req_type = DP_ENUM_PATH_RESOURCES;
673 req.u.port_num.port_number = port_num;
674 drm_dp_encode_sideband_req(&req, msg);
675 msg->path_msg = true;
679 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
680 u8 vcpi, uint16_t pbn,
681 u8 number_sdp_streams,
684 struct drm_dp_sideband_msg_req_body req;
685 memset(&req, 0, sizeof(req));
686 req.req_type = DP_ALLOCATE_PAYLOAD;
687 req.u.allocate_payload.port_number = port_num;
688 req.u.allocate_payload.vcpi = vcpi;
689 req.u.allocate_payload.pbn = pbn;
690 req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
691 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
693 drm_dp_encode_sideband_req(&req, msg);
694 msg->path_msg = true;
698 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
699 struct drm_dp_vcpi *vcpi)
703 mutex_lock(&mgr->payload_lock);
704 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
705 if (ret > mgr->max_payloads) {
707 DRM_DEBUG_KMS("out of payload ids %d\n", ret);
711 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
712 if (vcpi_ret > mgr->max_payloads) {
714 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
718 set_bit(ret, &mgr->payload_mask);
719 set_bit(vcpi_ret, &mgr->vcpi_mask);
720 vcpi->vcpi = vcpi_ret + 1;
721 mgr->proposed_vcpis[ret - 1] = vcpi;
723 mutex_unlock(&mgr->payload_lock);
727 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
734 mutex_lock(&mgr->payload_lock);
735 DRM_DEBUG_KMS("putting payload %d\n", vcpi);
736 clear_bit(vcpi - 1, &mgr->vcpi_mask);
738 for (i = 0; i < mgr->max_payloads; i++) {
739 if (mgr->proposed_vcpis[i])
740 if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
741 mgr->proposed_vcpis[i] = NULL;
742 clear_bit(i + 1, &mgr->payload_mask);
745 mutex_unlock(&mgr->payload_lock);
748 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
749 struct drm_dp_sideband_msg_tx *txmsg)
754 * All updates to txmsg->state are protected by mgr->qlock, and the two
755 * cases we check here are terminal states. For those the barriers
756 * provided by the wake_up/wait_event pair are enough.
758 state = READ_ONCE(txmsg->state);
759 return (state == DRM_DP_SIDEBAND_TX_RX ||
760 state == DRM_DP_SIDEBAND_TX_TIMEOUT);
763 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
764 struct drm_dp_sideband_msg_tx *txmsg)
766 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
769 ret = wait_event_timeout(mgr->tx_waitq,
770 check_txmsg_state(mgr, txmsg),
772 mutex_lock(&mstb->mgr->qlock);
774 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
779 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
781 /* dump some state */
785 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
786 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
787 list_del(&txmsg->next);
790 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
791 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
792 mstb->tx_slots[txmsg->seqno] = NULL;
796 mutex_unlock(&mgr->qlock);
801 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
803 struct drm_dp_mst_branch *mstb;
805 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
811 memcpy(mstb->rad, rad, lct / 2);
812 INIT_LIST_HEAD(&mstb->ports);
813 kref_init(&mstb->kref);
817 static void drm_dp_free_mst_port(struct kref *kref);
819 static void drm_dp_free_mst_branch_device(struct kref *kref)
821 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
822 if (mstb->port_parent) {
823 if (list_empty(&mstb->port_parent->next))
824 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
829 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
831 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
832 struct drm_dp_mst_port *port, *tmp;
833 bool wake_tx = false;
836 * init kref again to be used by ports to remove mst branch when it is
841 if (mstb->port_parent && list_empty(&mstb->port_parent->next))
842 kref_get(&mstb->port_parent->kref);
845 * destroy all ports - don't need lock
846 * as there are no more references to the mst branch
847 * device at this point.
849 list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
850 list_del(&port->next);
851 drm_dp_put_port(port);
854 /* drop any tx slots msg */
855 mutex_lock(&mstb->mgr->qlock);
856 if (mstb->tx_slots[0]) {
857 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
858 mstb->tx_slots[0] = NULL;
861 if (mstb->tx_slots[1]) {
862 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
863 mstb->tx_slots[1] = NULL;
866 mutex_unlock(&mstb->mgr->qlock);
869 wake_up_all(&mstb->mgr->tx_waitq);
871 kref_put(kref, drm_dp_free_mst_branch_device);
874 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
876 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
880 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
882 struct drm_dp_mst_branch *mstb;
885 case DP_PEER_DEVICE_DP_LEGACY_CONV:
886 case DP_PEER_DEVICE_SST_SINK:
887 /* remove i2c over sideband */
888 drm_dp_mst_unregister_i2c_bus(&port->aux);
890 case DP_PEER_DEVICE_MST_BRANCHING:
893 drm_dp_put_mst_branch_device(mstb);
898 static void drm_dp_destroy_port(struct kref *kref)
900 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
901 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
904 port->vcpi.num_slots = 0;
906 kfree(port->cached_edid);
909 * The only time we don't have a connector
910 * on an output port is if the connector init
913 if (port->connector) {
914 /* we can't destroy the connector here, as
915 * we might be holding the mode_config.mutex
916 * from an EDID retrieval */
918 mutex_lock(&mgr->destroy_connector_lock);
919 kref_get(&port->parent->kref);
920 list_add(&port->next, &mgr->destroy_connector_list);
921 mutex_unlock(&mgr->destroy_connector_lock);
922 schedule_work(&mgr->destroy_connector_work);
925 /* no need to clean up vcpi
926 * as if we have no connector we never setup a vcpi */
927 drm_dp_port_teardown_pdt(port, port->pdt);
928 port->pdt = DP_PEER_DEVICE_NONE;
933 static void drm_dp_put_port(struct drm_dp_mst_port *port)
935 kref_put(&port->kref, drm_dp_destroy_port);
938 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)
940 struct drm_dp_mst_port *port;
941 struct drm_dp_mst_branch *rmstb;
942 if (to_find == mstb) {
943 kref_get(&mstb->kref);
946 list_for_each_entry(port, &mstb->ports, next) {
948 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
956 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)
958 struct drm_dp_mst_branch *rmstb = NULL;
959 mutex_lock(&mgr->lock);
960 if (mgr->mst_primary)
961 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
962 mutex_unlock(&mgr->lock);
966 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)
968 struct drm_dp_mst_port *port, *mport;
970 list_for_each_entry(port, &mstb->ports, next) {
971 if (port == to_find) {
972 kref_get(&port->kref);
976 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
984 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)
986 struct drm_dp_mst_port *rport = NULL;
987 mutex_lock(&mgr->lock);
988 if (mgr->mst_primary)
989 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
990 mutex_unlock(&mgr->lock);
994 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
996 struct drm_dp_mst_port *port;
998 list_for_each_entry(port, &mstb->ports, next) {
999 if (port->port_num == port_num) {
1000 kref_get(&port->kref);
1009 * calculate a new RAD for this MST branch device
1010 * if parent has an LCT of 2 then it has 1 nibble of RAD,
1011 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
1013 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
1016 int parent_lct = port->parent->lct;
1018 int idx = (parent_lct - 1) / 2;
1019 if (parent_lct > 1) {
1020 memcpy(rad, port->parent->rad, idx + 1);
1021 shift = (parent_lct % 2) ? 4 : 0;
1025 rad[idx] |= port->port_num << shift;
1026 return parent_lct + 1;
1030 * return sends link address for new mstb
1032 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
1036 bool send_link = false;
1037 switch (port->pdt) {
1038 case DP_PEER_DEVICE_DP_LEGACY_CONV:
1039 case DP_PEER_DEVICE_SST_SINK:
1040 /* add i2c over sideband */
1041 ret = drm_dp_mst_register_i2c_bus(&port->aux);
1043 case DP_PEER_DEVICE_MST_BRANCHING:
1044 lct = drm_dp_calculate_rad(port, rad);
1046 port->mstb = drm_dp_add_mst_branch_device(lct, rad);
1048 port->mstb->mgr = port->mgr;
1049 port->mstb->port_parent = port;
1058 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
1062 memcpy(mstb->guid, guid, 16);
1064 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
1065 if (mstb->port_parent) {
1066 ret = drm_dp_send_dpcd_write(
1074 ret = drm_dp_dpcd_write(
1083 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
1086 size_t proppath_size)
1090 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
1091 for (i = 0; i < (mstb->lct - 1); i++) {
1092 int shift = (i % 2) ? 0 : 4;
1093 int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
1094 snprintf(temp, sizeof(temp), "-%d", port_num);
1095 strlcat(proppath, temp, proppath_size);
1097 snprintf(temp, sizeof(temp), "-%d", pnum);
1098 strlcat(proppath, temp, proppath_size);
1101 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
1102 struct drm_device *dev,
1103 struct drm_dp_link_addr_reply_port *port_msg)
1105 struct drm_dp_mst_port *port;
1107 bool created = false;
1110 port = drm_dp_get_port(mstb, port_msg->port_number);
1112 port = kzalloc(sizeof(*port), GFP_KERNEL);
1115 kref_init(&port->kref);
1116 port->parent = mstb;
1117 port->port_num = port_msg->port_number;
1118 port->mgr = mstb->mgr;
1119 port->aux.name = "DPMST";
1120 port->aux.dev = dev->dev;
1123 old_pdt = port->pdt;
1124 old_ddps = port->ddps;
1127 port->pdt = port_msg->peer_device_type;
1128 port->input = port_msg->input_port;
1129 port->mcs = port_msg->mcs;
1130 port->ddps = port_msg->ddps;
1131 port->ldps = port_msg->legacy_device_plug_status;
1132 port->dpcd_rev = port_msg->dpcd_revision;
1133 port->num_sdp_streams = port_msg->num_sdp_streams;
1134 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
1136 /* manage mstb port lists with mgr lock - take a reference
1139 mutex_lock(&mstb->mgr->lock);
1140 kref_get(&port->kref);
1141 list_add(&port->next, &mstb->ports);
1142 mutex_unlock(&mstb->mgr->lock);
1145 if (old_ddps != port->ddps) {
1148 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
1150 port->available_pbn = 0;
1154 if (old_pdt != port->pdt && !port->input) {
1155 drm_dp_port_teardown_pdt(port, old_pdt);
1157 ret = drm_dp_port_setup_pdt(port);
1159 drm_dp_send_link_address(mstb->mgr, port->mstb);
1162 if (created && !port->input) {
1165 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
1166 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
1167 if (!port->connector) {
1168 /* remove it from the port list */
1169 mutex_lock(&mstb->mgr->lock);
1170 list_del(&port->next);
1171 mutex_unlock(&mstb->mgr->lock);
1172 /* drop port list reference */
1173 drm_dp_put_port(port);
1176 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
1177 port->pdt == DP_PEER_DEVICE_SST_SINK) &&
1178 port->port_num >= DP_MST_LOGICAL_PORT_0) {
1179 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
1180 drm_mode_connector_set_tile_property(port->connector);
1182 (*mstb->mgr->cbs->register_connector)(port->connector);
1186 /* put reference to this port */
1187 drm_dp_put_port(port);
1190 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
1191 struct drm_dp_connection_status_notify *conn_stat)
1193 struct drm_dp_mst_port *port;
1196 bool dowork = false;
1197 port = drm_dp_get_port(mstb, conn_stat->port_number);
1201 old_ddps = port->ddps;
1202 old_pdt = port->pdt;
1203 port->pdt = conn_stat->peer_device_type;
1204 port->mcs = conn_stat->message_capability_status;
1205 port->ldps = conn_stat->legacy_device_plug_status;
1206 port->ddps = conn_stat->displayport_device_plug_status;
1208 if (old_ddps != port->ddps) {
1212 port->available_pbn = 0;
1215 if (old_pdt != port->pdt && !port->input) {
1216 drm_dp_port_teardown_pdt(port, old_pdt);
1218 if (drm_dp_port_setup_pdt(port))
1222 drm_dp_put_port(port);
1224 queue_work(system_long_wq, &mstb->mgr->work);
1228 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
1231 struct drm_dp_mst_branch *mstb;
1232 struct drm_dp_mst_port *port;
1234 /* find the port by iterating down */
1236 mutex_lock(&mgr->lock);
1237 mstb = mgr->mst_primary;
1242 for (i = 0; i < lct - 1; i++) {
1243 int shift = (i % 2) ? 0 : 4;
1244 int port_num = (rad[i / 2] >> shift) & 0xf;
1246 list_for_each_entry(port, &mstb->ports, next) {
1247 if (port->port_num == port_num) {
1250 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
1258 kref_get(&mstb->kref);
1260 mutex_unlock(&mgr->lock);
1264 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
1265 struct drm_dp_mst_branch *mstb,
1268 struct drm_dp_mst_branch *found_mstb;
1269 struct drm_dp_mst_port *port;
1271 if (memcmp(mstb->guid, guid, 16) == 0)
1275 list_for_each_entry(port, &mstb->ports, next) {
1279 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
1288 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
1289 struct drm_dp_mst_topology_mgr *mgr,
1292 struct drm_dp_mst_branch *mstb;
1294 /* find the port by iterating down */
1295 mutex_lock(&mgr->lock);
1297 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
1300 kref_get(&mstb->kref);
1302 mutex_unlock(&mgr->lock);
1306 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1307 struct drm_dp_mst_branch *mstb)
1309 struct drm_dp_mst_port *port;
1310 struct drm_dp_mst_branch *mstb_child;
1311 if (!mstb->link_address_sent)
1312 drm_dp_send_link_address(mgr, mstb);
1314 list_for_each_entry(port, &mstb->ports, next) {
1321 if (!port->available_pbn)
1322 drm_dp_send_enum_path_resources(mgr, mstb, port);
1325 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb);
1327 drm_dp_check_and_send_link_address(mgr, mstb_child);
1328 drm_dp_put_mst_branch_device(mstb_child);
1334 static void drm_dp_mst_link_probe_work(struct work_struct *work)
1336 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
1337 struct drm_dp_mst_branch *mstb;
1339 mutex_lock(&mgr->lock);
1340 mstb = mgr->mst_primary;
1342 kref_get(&mstb->kref);
1344 mutex_unlock(&mgr->lock);
1346 drm_dp_check_and_send_link_address(mgr, mstb);
1347 drm_dp_put_mst_branch_device(mstb);
1351 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
1356 if (memchr_inv(guid, 0, 16))
1359 salt = get_jiffies_64();
1361 memcpy(&guid[0], &salt, sizeof(u64));
1362 memcpy(&guid[8], &salt, sizeof(u64));
1368 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
1370 struct drm_dp_sideband_msg_req_body req;
1372 req.req_type = DP_REMOTE_DPCD_READ;
1373 req.u.dpcd_read.port_number = port_num;
1374 req.u.dpcd_read.dpcd_address = offset;
1375 req.u.dpcd_read.num_bytes = num_bytes;
1376 drm_dp_encode_sideband_req(&req, msg);
1382 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
1383 bool up, u8 *msg, int len)
1386 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
1387 int tosend, total, offset;
1394 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
1396 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
1399 if (ret != tosend) {
1400 if (ret == -EIO && retries < 5) {
1404 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
1410 } while (total > 0);
1414 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
1415 struct drm_dp_sideband_msg_tx *txmsg)
1417 struct drm_dp_mst_branch *mstb = txmsg->dst;
1420 /* both msg slots are full */
1421 if (txmsg->seqno == -1) {
1422 if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
1423 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
1426 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
1427 txmsg->seqno = mstb->last_seqno;
1428 mstb->last_seqno ^= 1;
1429 } else if (mstb->tx_slots[0] == NULL)
1433 mstb->tx_slots[txmsg->seqno] = txmsg;
1436 req_type = txmsg->msg[0] & 0x7f;
1437 if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
1438 req_type == DP_RESOURCE_STATUS_NOTIFY)
1442 hdr->path_msg = txmsg->path_msg;
1443 hdr->lct = mstb->lct;
1444 hdr->lcr = mstb->lct - 1;
1446 memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
1447 hdr->seqno = txmsg->seqno;
1451 * process a single block of the next message in the sideband queue
1453 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1454 struct drm_dp_sideband_msg_tx *txmsg,
1458 struct drm_dp_sideband_msg_hdr hdr;
1459 int len, space, idx, tosend;
1462 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
1464 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
1466 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
1469 /* make hdr from dst mst - for replies use seqno
1470 otherwise assign one */
1471 ret = set_hdr_from_dst_qlock(&hdr, txmsg);
1475 /* amount left to send in this message */
1476 len = txmsg->cur_len - txmsg->cur_offset;
1478 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1479 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
1481 tosend = min(len, space);
1482 if (len == txmsg->cur_len)
1488 hdr.msg_len = tosend + 1;
1489 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
1490 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
1491 /* add crc at end */
1492 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
1495 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
1497 DRM_DEBUG_KMS("sideband msg failed to send\n");
1501 txmsg->cur_offset += tosend;
1502 if (txmsg->cur_offset == txmsg->cur_len) {
1503 txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
1509 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
1511 struct drm_dp_sideband_msg_tx *txmsg;
1514 WARN_ON(!mutex_is_locked(&mgr->qlock));
1516 /* construct a chunk from the first msg in the tx_msg queue */
1517 if (list_empty(&mgr->tx_msg_downq))
1520 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
1521 ret = process_single_tx_qlock(mgr, txmsg, false);
1523 /* txmsg is sent it should be in the slots now */
1524 list_del(&txmsg->next);
1526 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1527 list_del(&txmsg->next);
1528 if (txmsg->seqno != -1)
1529 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1530 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
1531 wake_up_all(&mgr->tx_waitq);
1535 /* called holding qlock */
1536 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
1537 struct drm_dp_sideband_msg_tx *txmsg)
1541 /* construct a chunk from the first msg in the tx_msg queue */
1542 ret = process_single_tx_qlock(mgr, txmsg, true);
1545 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
1547 if (txmsg->seqno != -1) {
1548 WARN_ON((unsigned int)txmsg->seqno >
1549 ARRAY_SIZE(txmsg->dst->tx_slots));
1550 txmsg->dst->tx_slots[txmsg->seqno] = NULL;
1554 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
1555 struct drm_dp_sideband_msg_tx *txmsg)
1557 mutex_lock(&mgr->qlock);
1558 list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
1559 if (list_is_singular(&mgr->tx_msg_downq))
1560 process_single_down_tx_qlock(mgr);
1561 mutex_unlock(&mgr->qlock);
1564 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
1565 struct drm_dp_mst_branch *mstb)
1568 struct drm_dp_sideband_msg_tx *txmsg;
1571 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1576 len = build_link_address(txmsg);
1578 mstb->link_address_sent = true;
1579 drm_dp_queue_down_tx(mgr, txmsg);
1581 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1585 if (txmsg->reply.reply_type == 1)
1586 DRM_DEBUG_KMS("link address nak received\n");
1588 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
1589 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1590 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,
1591 txmsg->reply.u.link_addr.ports[i].input_port,
1592 txmsg->reply.u.link_addr.ports[i].peer_device_type,
1593 txmsg->reply.u.link_addr.ports[i].port_number,
1594 txmsg->reply.u.link_addr.ports[i].dpcd_revision,
1595 txmsg->reply.u.link_addr.ports[i].mcs,
1596 txmsg->reply.u.link_addr.ports[i].ddps,
1597 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
1598 txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
1599 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
1602 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
1604 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
1605 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
1607 (*mgr->cbs->hotplug)(mgr);
1610 mstb->link_address_sent = false;
1611 DRM_DEBUG_KMS("link address failed %d\n", ret);
1617 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
1618 struct drm_dp_mst_branch *mstb,
1619 struct drm_dp_mst_port *port)
1622 struct drm_dp_sideband_msg_tx *txmsg;
1625 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1630 len = build_enum_path_resources(txmsg, port->port_num);
1632 drm_dp_queue_down_tx(mgr, txmsg);
1634 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1636 if (txmsg->reply.reply_type == 1)
1637 DRM_DEBUG_KMS("enum path resources nak received\n");
1639 if (port->port_num != txmsg->reply.u.path_resources.port_number)
1640 DRM_ERROR("got incorrect port in response\n");
1641 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,
1642 txmsg->reply.u.path_resources.avail_payload_bw_number);
1643 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
1651 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
1653 if (!mstb->port_parent)
1656 if (mstb->port_parent->mstb != mstb)
1657 return mstb->port_parent;
1659 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
1662 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
1663 struct drm_dp_mst_branch *mstb,
1666 struct drm_dp_mst_branch *rmstb = NULL;
1667 struct drm_dp_mst_port *found_port;
1668 mutex_lock(&mgr->lock);
1669 if (mgr->mst_primary) {
1670 found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
1673 rmstb = found_port->parent;
1674 kref_get(&rmstb->kref);
1675 *port_num = found_port->port_num;
1678 mutex_unlock(&mgr->lock);
1682 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
1683 struct drm_dp_mst_port *port,
1687 struct drm_dp_sideband_msg_tx *txmsg;
1688 struct drm_dp_mst_branch *mstb;
1689 int len, ret, port_num;
1690 u8 sinks[DRM_DP_MAX_SDP_STREAMS];
1693 port = drm_dp_get_validated_port_ref(mgr, port);
1697 port_num = port->port_num;
1698 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1700 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
1703 drm_dp_put_port(port);
1708 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1714 for (i = 0; i < port->num_sdp_streams; i++)
1718 len = build_allocate_payload(txmsg, port_num,
1720 pbn, port->num_sdp_streams, sinks);
1722 drm_dp_queue_down_tx(mgr, txmsg);
1724 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1726 if (txmsg->reply.reply_type == 1) {
1733 drm_dp_put_mst_branch_device(mstb);
1734 drm_dp_put_port(port);
1738 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1740 struct drm_dp_payload *payload)
1744 ret = drm_dp_dpcd_write_payload(mgr, id, payload);
1746 payload->payload_state = 0;
1749 payload->payload_state = DP_PAYLOAD_LOCAL;
1753 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1754 struct drm_dp_mst_port *port,
1756 struct drm_dp_payload *payload)
1759 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
1762 payload->payload_state = DP_PAYLOAD_REMOTE;
1766 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
1767 struct drm_dp_mst_port *port,
1769 struct drm_dp_payload *payload)
1771 DRM_DEBUG_KMS("\n");
1772 /* its okay for these to fail */
1774 drm_dp_payload_send_msg(mgr, port, id, 0);
1777 drm_dp_dpcd_write_payload(mgr, id, payload);
1778 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
1782 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
1784 struct drm_dp_payload *payload)
1786 payload->payload_state = 0;
1791 * drm_dp_update_payload_part1() - Execute payload update part 1
1792 * @mgr: manager to use.
1794 * This iterates over all proposed virtual channels, and tries to
1795 * allocate space in the link for them. For 0->slots transitions,
1796 * this step just writes the VCPI to the MST device. For slots->0
1797 * transitions, this writes the updated VCPIs and removes the
1798 * remote VC payloads.
1800 * after calling this the driver should generate ACT and payload
1803 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
1807 struct drm_dp_payload req_payload;
1808 struct drm_dp_mst_port *port;
1810 mutex_lock(&mgr->payload_lock);
1811 for (i = 0; i < mgr->max_payloads; i++) {
1812 /* solve the current payloads - compare to the hw ones
1813 - update the hw view */
1814 req_payload.start_slot = cur_slots;
1815 if (mgr->proposed_vcpis[i]) {
1816 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1817 port = drm_dp_get_validated_port_ref(mgr, port);
1819 mutex_unlock(&mgr->payload_lock);
1822 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
1823 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi;
1826 req_payload.num_slots = 0;
1829 if (mgr->payloads[i].start_slot != req_payload.start_slot) {
1830 mgr->payloads[i].start_slot = req_payload.start_slot;
1832 /* work out what is required to happen with this payload */
1833 if (mgr->payloads[i].num_slots != req_payload.num_slots) {
1835 /* need to push an update for this payload */
1836 if (req_payload.num_slots) {
1837 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
1838 mgr->payloads[i].num_slots = req_payload.num_slots;
1839 mgr->payloads[i].vcpi = req_payload.vcpi;
1840 } else if (mgr->payloads[i].num_slots) {
1841 mgr->payloads[i].num_slots = 0;
1842 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]);
1843 req_payload.payload_state = mgr->payloads[i].payload_state;
1844 mgr->payloads[i].start_slot = 0;
1846 mgr->payloads[i].payload_state = req_payload.payload_state;
1848 cur_slots += req_payload.num_slots;
1851 drm_dp_put_port(port);
1854 for (i = 0; i < mgr->max_payloads; i++) {
1855 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1856 DRM_DEBUG_KMS("removing payload %d\n", i);
1857 for (j = i; j < mgr->max_payloads - 1; j++) {
1858 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
1859 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
1860 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
1861 set_bit(j + 1, &mgr->payload_mask);
1863 clear_bit(j + 1, &mgr->payload_mask);
1866 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
1867 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
1868 clear_bit(mgr->max_payloads, &mgr->payload_mask);
1872 mutex_unlock(&mgr->payload_lock);
1876 EXPORT_SYMBOL(drm_dp_update_payload_part1);
1879 * drm_dp_update_payload_part2() - Execute payload update part 2
1880 * @mgr: manager to use.
1882 * This iterates over all proposed virtual channels, and tries to
1883 * allocate space in the link for them. For 0->slots transitions,
1884 * this step writes the remote VC payload commands. For slots->0
1885 * this just resets some internal state.
1887 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
1889 struct drm_dp_mst_port *port;
1892 mutex_lock(&mgr->payload_lock);
1893 for (i = 0; i < mgr->max_payloads; i++) {
1895 if (!mgr->proposed_vcpis[i])
1898 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
1900 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
1901 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
1902 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1903 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
1904 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
1907 mutex_unlock(&mgr->payload_lock);
1911 mutex_unlock(&mgr->payload_lock);
1914 EXPORT_SYMBOL(drm_dp_update_payload_part2);
1916 #if 0 /* unused as of yet */
1917 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
1918 struct drm_dp_mst_port *port,
1919 int offset, int size)
1922 struct drm_dp_sideband_msg_tx *txmsg;
1924 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1928 len = build_dpcd_read(txmsg, port->port_num, 0, 8);
1929 txmsg->dst = port->parent;
1931 drm_dp_queue_down_tx(mgr, txmsg);
1937 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
1938 struct drm_dp_mst_port *port,
1939 int offset, int size, u8 *bytes)
1943 struct drm_dp_sideband_msg_tx *txmsg;
1944 struct drm_dp_mst_branch *mstb;
1946 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
1950 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1956 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
1959 drm_dp_queue_down_tx(mgr, txmsg);
1961 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
1963 if (txmsg->reply.reply_type == 1) {
1970 drm_dp_put_mst_branch_device(mstb);
1974 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
1976 struct drm_dp_sideband_msg_reply_body reply;
1978 reply.reply_type = 0;
1979 reply.req_type = req_type;
1980 drm_dp_encode_sideband_reply(&reply, msg);
1984 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
1985 struct drm_dp_mst_branch *mstb,
1986 int req_type, int seqno, bool broadcast)
1988 struct drm_dp_sideband_msg_tx *txmsg;
1990 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
1995 txmsg->seqno = seqno;
1996 drm_dp_encode_up_ack_reply(txmsg, req_type);
1998 mutex_lock(&mgr->qlock);
2000 process_single_up_tx_qlock(mgr, txmsg);
2002 mutex_unlock(&mgr->qlock);
2008 static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
2012 switch (dp_link_bw) {
2014 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
2015 dp_link_bw, dp_link_count);
2018 case DP_LINK_BW_1_62:
2019 *out = 3 * dp_link_count;
2021 case DP_LINK_BW_2_7:
2022 *out = 5 * dp_link_count;
2024 case DP_LINK_BW_5_4:
2025 *out = 10 * dp_link_count;
2032 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
2033 * @mgr: manager to set state for
2034 * @mst_state: true to enable MST on this connector - false to disable.
2036 * This is called by the driver when it detects an MST capable device plugged
2037 * into a DP MST capable port, or when a DP MST capable device is unplugged.
2039 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
2042 struct drm_dp_mst_branch *mstb = NULL;
2044 mutex_lock(&mgr->payload_lock);
2045 mutex_lock(&mgr->lock);
2046 if (mst_state == mgr->mst_state)
2049 mgr->mst_state = mst_state;
2050 /* set the device into MST mode */
2052 WARN_ON(mgr->mst_primary);
2055 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
2056 if (ret != DP_RECEIVER_CAP_SIZE) {
2057 DRM_DEBUG_KMS("failed to read DPCD\n");
2061 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
2062 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
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_all(&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 /* max. time slots - one slot for MTP header */
2524 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
2526 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2527 struct drm_dp_vcpi *vcpi, int pbn, int slots)
2531 /* max. time slots - one slot for MTP header */
2536 vcpi->aligned_pbn = slots * mgr->pbn_div;
2537 vcpi->num_slots = slots;
2539 ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
2546 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state
2547 * @state: global atomic state
2548 * @mgr: MST topology manager for the port
2549 * @port: port to find vcpi slots for
2550 * @pbn: bandwidth required for the mode in PBN
2553 * Total slots in the atomic state assigned for this port or error
2555 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
2556 struct drm_dp_mst_topology_mgr *mgr,
2557 struct drm_dp_mst_port *port, int pbn)
2559 struct drm_dp_mst_topology_state *topology_state;
2562 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2563 if (IS_ERR(topology_state))
2564 return PTR_ERR(topology_state);
2566 port = drm_dp_get_validated_port_ref(mgr, port);
2569 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
2570 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n",
2571 req_slots, topology_state->avail_slots);
2573 if (req_slots > topology_state->avail_slots) {
2574 drm_dp_put_port(port);
2578 topology_state->avail_slots -= req_slots;
2579 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots);
2581 drm_dp_put_port(port);
2584 EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
2587 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
2588 * @state: global atomic state
2589 * @mgr: MST topology manager for the port
2590 * @slots: number of vcpi slots to release
2593 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or
2594 * negative error code
2596 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
2597 struct drm_dp_mst_topology_mgr *mgr,
2600 struct drm_dp_mst_topology_state *topology_state;
2602 topology_state = drm_atomic_get_mst_topology_state(state, mgr);
2603 if (IS_ERR(topology_state))
2604 return PTR_ERR(topology_state);
2606 /* We cannot rely on port->vcpi.num_slots to update
2607 * topology_state->avail_slots as the port may not exist if the parent
2608 * branch device was unplugged. This should be fixed by tracking
2609 * per-port slot allocation in drm_dp_mst_topology_state instead of
2610 * depending on the caller to tell us how many slots to release.
2612 topology_state->avail_slots += slots;
2613 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n",
2614 slots, topology_state->avail_slots);
2618 EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
2621 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2622 * @mgr: manager for this port
2623 * @port: port to allocate a virtual channel for.
2624 * @pbn: payload bandwidth number to request
2625 * @slots: returned number of slots for this PBN.
2627 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
2628 struct drm_dp_mst_port *port, int pbn, int slots)
2635 port = drm_dp_get_validated_port_ref(mgr, port);
2639 if (port->vcpi.vcpi > 0) {
2640 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
2641 if (pbn == port->vcpi.pbn) {
2642 drm_dp_put_port(port);
2647 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
2649 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
2650 DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
2651 drm_dp_put_port(port);
2654 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
2655 pbn, port->vcpi.num_slots);
2657 drm_dp_put_port(port);
2662 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
2664 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2667 port = drm_dp_get_validated_port_ref(mgr, port);
2671 slots = port->vcpi.num_slots;
2672 drm_dp_put_port(port);
2675 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
2678 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2679 * @mgr: manager for this port
2680 * @port: unverified pointer to a port.
2682 * This just resets the number of slots for the ports VCPI for later programming.
2684 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2686 port = drm_dp_get_validated_port_ref(mgr, port);
2689 port->vcpi.num_slots = 0;
2690 drm_dp_put_port(port);
2692 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
2695 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2696 * @mgr: manager for this port
2697 * @port: unverified port to deallocate vcpi for
2699 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
2701 port = drm_dp_get_validated_port_ref(mgr, port);
2705 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
2706 port->vcpi.num_slots = 0;
2708 port->vcpi.aligned_pbn = 0;
2709 port->vcpi.vcpi = 0;
2710 drm_dp_put_port(port);
2712 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
2714 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
2715 int id, struct drm_dp_payload *payload)
2717 u8 payload_alloc[3], status;
2721 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
2722 DP_PAYLOAD_TABLE_UPDATED);
2724 payload_alloc[0] = id;
2725 payload_alloc[1] = payload->start_slot;
2726 payload_alloc[2] = payload->num_slots;
2728 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
2730 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
2735 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2737 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
2741 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
2744 usleep_range(10000, 20000);
2747 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
2756 static int do_get_act_status(struct drm_dp_aux *aux)
2761 ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
2769 * drm_dp_check_act_status() - Check ACT handled status.
2770 * @mgr: manager to use
2772 * Check the payload status bits in the DPCD for ACT handled completion.
2774 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
2777 * There doesn't seem to be any recommended retry count or timeout in
2778 * the MST specification. Since some hubs have been observed to take
2779 * over 1 second to update their payload allocations under certain
2780 * conditions, we use a rather large timeout value.
2782 const int timeout_ms = 3000;
2785 ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,
2786 status & DP_PAYLOAD_ACT_HANDLED || status < 0,
2787 200, timeout_ms * USEC_PER_MSEC);
2788 if (ret < 0 && status >= 0) {
2789 DRM_DEBUG_KMS("Failed to get ACT after %dms, last status: %02x\n",
2790 timeout_ms, status);
2792 } else if (status < 0) {
2793 DRM_DEBUG_KMS("Failed to read payload table status: %d\n",
2800 EXPORT_SYMBOL(drm_dp_check_act_status);
2803 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2804 * @clock: dot clock for the mode
2805 * @bpp: bpp for the mode.
2807 * This uses the formula in the spec to calculate the PBN value for a mode.
2809 int drm_dp_calc_pbn_mode(int clock, int bpp)
2819 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
2820 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
2821 * common multiplier to render an integer PBN for all link rate/lane
2822 * counts combinations
2824 * peak_kbps *= (1006/1000)
2825 * peak_kbps *= (64/54)
2826 * peak_kbps *= 8 convert to bytes
2829 numerator = 64 * 1006;
2830 denominator = 54 * 8 * 1000 * 1000;
2833 peak_kbps = drm_fixp_from_fraction(kbps, denominator);
2835 return drm_fixp2int_ceil(peak_kbps);
2837 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
2839 static int test_calc_pbn_mode(void)
2842 ret = drm_dp_calc_pbn_mode(154000, 30);
2844 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2845 154000, 30, 689, ret);
2848 ret = drm_dp_calc_pbn_mode(234000, 30);
2850 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2851 234000, 30, 1047, ret);
2854 ret = drm_dp_calc_pbn_mode(297000, 24);
2856 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
2857 297000, 24, 1063, ret);
2863 /* we want to kick the TX after we've ack the up/down IRQs. */
2864 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
2866 queue_work(system_long_wq, &mgr->tx_work);
2869 static void drm_dp_mst_dump_mstb(struct seq_file *m,
2870 struct drm_dp_mst_branch *mstb)
2872 struct drm_dp_mst_port *port;
2873 int tabs = mstb->lct;
2877 for (i = 0; i < tabs; i++)
2881 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
2882 list_for_each_entry(port, &mstb->ports, next) {
2883 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);
2885 drm_dp_mst_dump_mstb(m, port->mstb);
2889 #define DP_PAYLOAD_TABLE_SIZE 64
2891 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
2896 for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
2897 if (drm_dp_dpcd_read(mgr->aux,
2898 DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
2905 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
2906 struct drm_dp_mst_port *port, char *name,
2909 struct edid *mst_edid;
2911 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
2912 drm_edid_get_monitor_name(mst_edid, name, namelen);
2916 * drm_dp_mst_dump_topology(): dump topology to seq file.
2917 * @m: seq_file to dump output to
2918 * @mgr: manager to dump current topology for.
2920 * helper to dump MST topology to a seq file for debugfs.
2922 void drm_dp_mst_dump_topology(struct seq_file *m,
2923 struct drm_dp_mst_topology_mgr *mgr)
2926 struct drm_dp_mst_port *port;
2928 mutex_lock(&mgr->lock);
2929 if (mgr->mst_primary)
2930 drm_dp_mst_dump_mstb(m, mgr->mst_primary);
2933 mutex_unlock(&mgr->lock);
2935 mutex_lock(&mgr->payload_lock);
2936 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
2939 for (i = 0; i < mgr->max_payloads; i++) {
2940 if (mgr->proposed_vcpis[i]) {
2943 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
2944 fetch_monitor_name(mgr, port, name, sizeof(name));
2945 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
2946 port->port_num, port->vcpi.vcpi,
2947 port->vcpi.num_slots,
2948 (*name != 0) ? name : "Unknown");
2950 seq_printf(m, "vcpi %d:unused\n", i);
2952 for (i = 0; i < mgr->max_payloads; i++) {
2953 seq_printf(m, "payload %d: %d, %d, %d\n",
2955 mgr->payloads[i].payload_state,
2956 mgr->payloads[i].start_slot,
2957 mgr->payloads[i].num_slots);
2961 mutex_unlock(&mgr->payload_lock);
2963 mutex_lock(&mgr->lock);
2964 if (mgr->mst_primary) {
2965 u8 buf[DP_PAYLOAD_TABLE_SIZE];
2968 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
2969 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
2970 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
2971 seq_printf(m, "faux/mst: %*ph\n", 2, buf);
2972 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
2973 seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
2975 /* dump the standard OUI branch header */
2976 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
2977 seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
2978 for (i = 0x3; i < 0x8 && buf[i]; i++)
2979 seq_printf(m, "%c", buf[i]);
2980 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
2981 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
2982 if (dump_dp_payload_table(mgr, buf))
2983 seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
2986 mutex_unlock(&mgr->lock);
2989 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
2991 static void drm_dp_tx_work(struct work_struct *work)
2993 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
2995 mutex_lock(&mgr->qlock);
2996 if (!list_empty(&mgr->tx_msg_downq))
2997 process_single_down_tx_qlock(mgr);
2998 mutex_unlock(&mgr->qlock);
3001 static void drm_dp_free_mst_port(struct kref *kref)
3003 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
3004 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
3008 static void drm_dp_destroy_connector_work(struct work_struct *work)
3010 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
3011 struct drm_dp_mst_port *port;
3012 bool send_hotplug = false;
3014 * Not a regular list traverse as we have to drop the destroy
3015 * connector lock before destroying the connector, to avoid AB->BA
3016 * ordering between this lock and the config mutex.
3019 mutex_lock(&mgr->destroy_connector_lock);
3020 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
3022 mutex_unlock(&mgr->destroy_connector_lock);
3025 list_del(&port->next);
3026 mutex_unlock(&mgr->destroy_connector_lock);
3028 kref_init(&port->kref);
3029 INIT_LIST_HEAD(&port->next);
3031 mgr->cbs->destroy_connector(mgr, port->connector);
3033 drm_dp_port_teardown_pdt(port, port->pdt);
3034 port->pdt = DP_PEER_DEVICE_NONE;
3036 if (!port->input && port->vcpi.vcpi > 0) {
3037 drm_dp_mst_reset_vcpi_slots(mgr, port);
3038 drm_dp_update_payload_part1(mgr);
3039 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
3042 kref_put(&port->kref, drm_dp_free_mst_port);
3043 send_hotplug = true;
3046 (*mgr->cbs->hotplug)(mgr);
3049 static struct drm_private_state *
3050 drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
3052 struct drm_dp_mst_topology_state *state;
3054 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
3058 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
3060 return &state->base;
3063 static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
3064 struct drm_private_state *state)
3066 struct drm_dp_mst_topology_state *mst_state =
3067 to_dp_mst_topology_state(state);
3072 static const struct drm_private_state_funcs mst_state_funcs = {
3073 .atomic_duplicate_state = drm_dp_mst_duplicate_state,
3074 .atomic_destroy_state = drm_dp_mst_destroy_state,
3078 * drm_atomic_get_mst_topology_state: get MST topology state
3080 * @state: global atomic state
3081 * @mgr: MST topology manager, also the private object in this case
3083 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
3084 * state vtable so that the private object state returned is that of a MST
3085 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
3086 * to care of the locking, so warn if don't hold the connection_mutex.
3090 * The MST topology state or error pointer.
3092 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
3093 struct drm_dp_mst_topology_mgr *mgr)
3095 struct drm_device *dev = mgr->dev;
3097 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
3098 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
3100 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
3103 * drm_dp_mst_topology_mgr_init - initialise a topology manager
3104 * @mgr: manager struct to initialise
3105 * @dev: device providing this structure - for i2c addition.
3106 * @aux: DP helper aux channel to talk to this device
3107 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
3108 * @max_payloads: maximum number of payloads this GPU can source
3109 * @conn_base_id: the connector object ID the MST device is connected to.
3111 * Return 0 for success, or negative error code on failure
3113 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
3114 struct drm_device *dev, struct drm_dp_aux *aux,
3115 int max_dpcd_transaction_bytes,
3116 int max_payloads, int conn_base_id)
3118 struct drm_dp_mst_topology_state *mst_state;
3120 mutex_init(&mgr->lock);
3121 mutex_init(&mgr->qlock);
3122 mutex_init(&mgr->payload_lock);
3123 mutex_init(&mgr->destroy_connector_lock);
3124 INIT_LIST_HEAD(&mgr->tx_msg_downq);
3125 INIT_LIST_HEAD(&mgr->destroy_connector_list);
3126 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
3127 INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
3128 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
3129 init_waitqueue_head(&mgr->tx_waitq);
3132 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
3133 mgr->max_payloads = max_payloads;
3134 mgr->conn_base_id = conn_base_id;
3135 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
3136 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
3138 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
3141 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
3142 if (!mgr->proposed_vcpis)
3144 set_bit(0, &mgr->payload_mask);
3145 if (test_calc_pbn_mode() < 0)
3146 DRM_ERROR("MST PBN self-test failed\n");
3148 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
3149 if (mst_state == NULL)
3152 mst_state->mgr = mgr;
3154 /* max. time slots - one slot for MTP header */
3155 mst_state->avail_slots = 63;
3157 drm_atomic_private_obj_init(&mgr->base,
3163 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
3166 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
3167 * @mgr: manager to destroy
3169 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
3171 flush_work(&mgr->work);
3172 flush_work(&mgr->destroy_connector_work);
3173 mutex_lock(&mgr->payload_lock);
3174 kfree(mgr->payloads);
3175 mgr->payloads = NULL;
3176 kfree(mgr->proposed_vcpis);
3177 mgr->proposed_vcpis = NULL;
3178 mutex_unlock(&mgr->payload_lock);
3181 drm_atomic_private_obj_fini(&mgr->base);
3184 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
3187 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
3190 struct drm_dp_aux *aux = adapter->algo_data;
3191 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
3192 struct drm_dp_mst_branch *mstb;
3193 struct drm_dp_mst_topology_mgr *mgr = port->mgr;
3195 bool reading = false;
3196 struct drm_dp_sideband_msg_req_body msg;
3197 struct drm_dp_sideband_msg_tx *txmsg = NULL;
3200 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
3204 /* construct i2c msg */
3205 /* see if last msg is a read */
3206 if (msgs[num - 1].flags & I2C_M_RD)
3209 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) {
3210 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
3215 memset(&msg, 0, sizeof(msg));
3216 msg.req_type = DP_REMOTE_I2C_READ;
3217 msg.u.i2c_read.num_transactions = num - 1;
3218 msg.u.i2c_read.port_number = port->port_num;
3219 for (i = 0; i < num - 1; i++) {
3220 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
3221 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
3222 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
3223 msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP);
3225 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
3226 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
3228 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
3235 drm_dp_encode_sideband_req(&msg, txmsg);
3237 drm_dp_queue_down_tx(mgr, txmsg);
3239 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
3242 if (txmsg->reply.reply_type == 1) { /* got a NAK back */
3246 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
3250 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
3255 drm_dp_put_mst_branch_device(mstb);
3259 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
3261 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
3262 I2C_FUNC_SMBUS_READ_BLOCK_DATA |
3263 I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
3264 I2C_FUNC_10BIT_ADDR;
3267 static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
3268 .functionality = drm_dp_mst_i2c_functionality,
3269 .master_xfer = drm_dp_mst_i2c_xfer,
3273 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
3274 * @aux: DisplayPort AUX channel
3276 * Returns 0 on success or a negative error code on failure.
3278 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
3280 aux->ddc.algo = &drm_dp_mst_i2c_algo;
3281 aux->ddc.algo_data = aux;
3282 aux->ddc.retries = 3;
3284 aux->ddc.class = I2C_CLASS_DDC;
3285 aux->ddc.owner = THIS_MODULE;
3286 aux->ddc.dev.parent = aux->dev;
3287 aux->ddc.dev.of_node = aux->dev->of_node;
3289 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
3290 sizeof(aux->ddc.name));
3292 return i2c_add_adapter(&aux->ddc);
3296 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
3297 * @aux: DisplayPort AUX channel
3299 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
3301 i2c_del_adapter(&aux->ddc);