26 #include <linux/i2c.h>
55  * protocol. The helpers contain a topology manager and bandwidth manager.
206 		number_of_bits--;  in drm_dp_msg_header_crc4()
210 		bitshift--;  in drm_dp_msg_header_crc4()
222 		number_of_bits--;  in drm_dp_msg_header_crc4()
240 		number_of_bits--;  in drm_dp_msg_data_crc4()
244 		bitshift--;  in drm_dp_msg_data_crc4()
256 		number_of_bits--;  in drm_dp_msg_data_crc4()
268 	size += (hdr->lct / 2);  in drm_dp_calc_sb_hdr_size()
279 	buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);  in drm_dp_encode_sideband_msg_hdr()
280 	for (i = 0; i < (hdr->lct / 2); i++)  in drm_dp_encode_sideband_msg_hdr()
281 		buf[idx++] = hdr->rad[i];  in drm_dp_encode_sideband_msg_hdr()
282 	buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |  in drm_dp_encode_sideband_msg_hdr()
283 		(hdr->msg_len & 0x3f);  in drm_dp_encode_sideband_msg_hdr()
284 	buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);  in drm_dp_encode_sideband_msg_hdr()
286 	crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);  in drm_dp_encode_sideband_msg_hdr()
287 	buf[idx - 1] |= (crc4 & 0xf);  in drm_dp_encode_sideband_msg_hdr()
307 	crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);  in drm_dp_decode_sideband_msg_hdr()
309 	if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {  in drm_dp_decode_sideband_msg_hdr()
310 		drm_dbg_kms(mgr->dev, "crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);  in drm_dp_decode_sideband_msg_hdr()
314 	hdr->lct = (buf[0] & 0xf0) >> 4;  in drm_dp_decode_sideband_msg_hdr()
315 	hdr->lcr = (buf[0] & 0xf);  in drm_dp_decode_sideband_msg_hdr()
317 	for (i = 0; i < (hdr->lct / 2); i++)  in drm_dp_decode_sideband_msg_hdr()
318 		hdr->rad[i] = buf[idx++];  in drm_dp_decode_sideband_msg_hdr()
319 	hdr->broadcast = (buf[idx] >> 7) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
320 	hdr->path_msg = (buf[idx] >> 6) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
321 	hdr->msg_len = buf[idx] & 0x3f;  in drm_dp_decode_sideband_msg_hdr()
323 	hdr->somt = (buf[idx] >> 7) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
324 	hdr->eomt = (buf[idx] >> 6) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
325 	hdr->seqno = (buf[idx] >> 4) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
337 	u8 *buf = raw->msg;  in drm_dp_encode_sideband_req()
339 	buf[idx++] = req->req_type & 0x7f;  in drm_dp_encode_sideband_req()
341 	switch (req->req_type) {  in drm_dp_encode_sideband_req()
345 		buf[idx] = (req->u.port_num.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
349 		buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |  in drm_dp_encode_sideband_req()
350 			(req->u.allocate_payload.number_sdp_streams & 0xf);  in drm_dp_encode_sideband_req()
352 		buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);  in drm_dp_encode_sideband_req()
354 		buf[idx] = (req->u.allocate_payload.pbn >> 8);  in drm_dp_encode_sideband_req()
356 		buf[idx] = (req->u.allocate_payload.pbn & 0xff);  in drm_dp_encode_sideband_req()
358 		for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {  in drm_dp_encode_sideband_req()
359 			buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |  in drm_dp_encode_sideband_req()
360 				(req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);  in drm_dp_encode_sideband_req()
363 		if (req->u.allocate_payload.number_sdp_streams & 1) {  in drm_dp_encode_sideband_req()
364 			i = req->u.allocate_payload.number_sdp_streams - 1;  in drm_dp_encode_sideband_req()
365 			buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;  in drm_dp_encode_sideband_req()
370 		buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
372 		buf[idx] = (req->u.query_payload.vcpi & 0x7f);  in drm_dp_encode_sideband_req()
376 		buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
377 		buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;  in drm_dp_encode_sideband_req()
379 		buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;  in drm_dp_encode_sideband_req()
381 		buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);  in drm_dp_encode_sideband_req()
383 		buf[idx] = (req->u.dpcd_read.num_bytes);  in drm_dp_encode_sideband_req()
388 		buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
389 		buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;  in drm_dp_encode_sideband_req()
391 		buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;  in drm_dp_encode_sideband_req()
393 		buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);  in drm_dp_encode_sideband_req()
395 		buf[idx] = (req->u.dpcd_write.num_bytes);  in drm_dp_encode_sideband_req()
397 		memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);  in drm_dp_encode_sideband_req()
398 		idx += req->u.dpcd_write.num_bytes;  in drm_dp_encode_sideband_req()
401 		buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
402 		buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);  in drm_dp_encode_sideband_req()
404 		for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {  in drm_dp_encode_sideband_req()
405 			buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;  in drm_dp_encode_sideband_req()
407 			buf[idx] = req->u.i2c_read.transactions[i].num_bytes;  in drm_dp_encode_sideband_req()
409 …memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes…  in drm_dp_encode_sideband_req()
410 			idx += req->u.i2c_read.transactions[i].num_bytes;  in drm_dp_encode_sideband_req()
412 			buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4;  in drm_dp_encode_sideband_req()
413 			buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);  in drm_dp_encode_sideband_req()
416 		buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;  in drm_dp_encode_sideband_req()
418 		buf[idx] = (req->u.i2c_read.num_bytes_read);  in drm_dp_encode_sideband_req()
423 		buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
425 		buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;  in drm_dp_encode_sideband_req()
427 		buf[idx] = (req->u.i2c_write.num_bytes);  in drm_dp_encode_sideband_req()
429 		memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);  in drm_dp_encode_sideband_req()
430 		idx += req->u.i2c_write.num_bytes;  in drm_dp_encode_sideband_req()
435 		msg = &req->u.enc_status;  in drm_dp_encode_sideband_req()
436 		buf[idx] = msg->stream_id;  in drm_dp_encode_sideband_req()
438 		memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id));  in drm_dp_encode_sideband_req()
439 		idx += sizeof(msg->client_id);  in drm_dp_encode_sideband_req()
441 		buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event);  in drm_dp_encode_sideband_req()
442 		buf[idx] |= msg->valid_stream_event ? BIT(2) : 0;  in drm_dp_encode_sideband_req()
443 		buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior);  in drm_dp_encode_sideband_req()
444 		buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0;  in drm_dp_encode_sideband_req()
449 	raw->cur_len = idx;  in drm_dp_encode_sideband_req()
458 	const u8 *buf = raw->msg;  in drm_dp_decode_sideband_req()
461 	req->req_type = buf[idx++] & 0x7f;  in drm_dp_decode_sideband_req()
462 	switch (req->req_type) {  in drm_dp_decode_sideband_req()
466 		req->u.port_num.port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
471 				&req->u.allocate_payload;  in drm_dp_decode_sideband_req()
473 			a->number_sdp_streams = buf[idx] & 0xf;  in drm_dp_decode_sideband_req()
474 			a->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
477 			a->vcpi = buf[idx] & 0x7f;  in drm_dp_decode_sideband_req()
479 			a->pbn = buf[++idx] << 8;  in drm_dp_decode_sideband_req()
480 			a->pbn |= buf[++idx];  in drm_dp_decode_sideband_req()
483 			for (i = 0; i < a->number_sdp_streams; i++) {  in drm_dp_decode_sideband_req()
484 				a->sdp_stream_sink[i] =  in drm_dp_decode_sideband_req()
490 		req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
492 		req->u.query_payload.vcpi = buf[idx] & 0x7f;  in drm_dp_decode_sideband_req()
496 			struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read;  in drm_dp_decode_sideband_req()
498 			r->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
500 			r->dpcd_address = (buf[idx] << 16) & 0xf0000;  in drm_dp_decode_sideband_req()
501 			r->dpcd_address |= (buf[++idx] << 8) & 0xff00;  in drm_dp_decode_sideband_req()
502 			r->dpcd_address |= buf[++idx] & 0xff;  in drm_dp_decode_sideband_req()
504 			r->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
510 				&req->u.dpcd_write;  in drm_dp_decode_sideband_req()
512 			w->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
514 			w->dpcd_address = (buf[idx] << 16) & 0xf0000;  in drm_dp_decode_sideband_req()
515 			w->dpcd_address |= (buf[++idx] << 8) & 0xff00;  in drm_dp_decode_sideband_req()
516 			w->dpcd_address |= buf[++idx] & 0xff;  in drm_dp_decode_sideband_req()
518 			w->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
520 			w->bytes = kmemdup(&buf[++idx], w->num_bytes,  in drm_dp_decode_sideband_req()
522 			if (!w->bytes)  in drm_dp_decode_sideband_req()
523 				return -ENOMEM;  in drm_dp_decode_sideband_req()
528 			struct drm_dp_remote_i2c_read *r = &req->u.i2c_read;  in drm_dp_decode_sideband_req()
532 			r->num_transactions = buf[idx] & 0x3;  in drm_dp_decode_sideband_req()
533 			r->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
534 			for (i = 0; i < r->num_transactions; i++) {  in drm_dp_decode_sideband_req()
535 				tx = &r->transactions[i];  in drm_dp_decode_sideband_req()
537 				tx->i2c_dev_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
538 				tx->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
539 				tx->bytes = kmemdup(&buf[++idx],  in drm_dp_decode_sideband_req()
540 						    tx->num_bytes,  in drm_dp_decode_sideband_req()
542 				if (!tx->bytes) {  in drm_dp_decode_sideband_req()
546 				idx += tx->num_bytes;  in drm_dp_decode_sideband_req()
547 				tx->no_stop_bit = (buf[idx] >> 5) & 0x1;  in drm_dp_decode_sideband_req()
548 				tx->i2c_transaction_delay = buf[idx] & 0xf;  in drm_dp_decode_sideband_req()
552 				for (i = 0; i < r->num_transactions; i++) {  in drm_dp_decode_sideband_req()
553 					tx = &r->transactions[i];  in drm_dp_decode_sideband_req()
554 					kfree(tx->bytes);  in drm_dp_decode_sideband_req()
556 				return -ENOMEM;  in drm_dp_decode_sideband_req()
559 			r->read_i2c_device_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
560 			r->num_bytes_read = buf[++idx];  in drm_dp_decode_sideband_req()
565 			struct drm_dp_remote_i2c_write *w = &req->u.i2c_write;  in drm_dp_decode_sideband_req()
567 			w->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
568 			w->write_i2c_device_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
569 			w->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
570 			w->bytes = kmemdup(&buf[++idx], w->num_bytes,  in drm_dp_decode_sideband_req()
572 			if (!w->bytes)  in drm_dp_decode_sideband_req()
573 				return -ENOMEM;  in drm_dp_decode_sideband_req()
577 		req->u.enc_status.stream_id = buf[idx++];  in drm_dp_decode_sideband_req()
578 		for (i = 0; i < sizeof(req->u.enc_status.client_id); i++)  in drm_dp_decode_sideband_req()
579 			req->u.enc_status.client_id[i] = buf[idx++];  in drm_dp_decode_sideband_req()
581 		req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0),  in drm_dp_decode_sideband_req()
583 		req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2),  in drm_dp_decode_sideband_req()
585 		req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3),  in drm_dp_decode_sideband_req()
587 		req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5),  in drm_dp_decode_sideband_req()
603 	if (req->req_type == DP_LINK_ADDRESS) {  in drm_dp_dump_sideband_msg_req_body()
605 		P("type=%s\n", drm_dp_mst_req_type_str(req->req_type));  in drm_dp_dump_sideband_msg_req_body()
609 	P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type));  in drm_dp_dump_sideband_msg_req_body()
612 	switch (req->req_type) {  in drm_dp_dump_sideband_msg_req_body()
616 		P("port=%d\n", req->u.port_num.port_number);  in drm_dp_dump_sideband_msg_req_body()
620 		  req->u.allocate_payload.port_number,  in drm_dp_dump_sideband_msg_req_body()
621 		  req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn,  in drm_dp_dump_sideband_msg_req_body()
622 		  req->u.allocate_payload.number_sdp_streams,  in drm_dp_dump_sideband_msg_req_body()
623 		  req->u.allocate_payload.number_sdp_streams,  in drm_dp_dump_sideband_msg_req_body()
624 		  req->u.allocate_payload.sdp_stream_sink);  in drm_dp_dump_sideband_msg_req_body()
628 		  req->u.query_payload.port_number,  in drm_dp_dump_sideband_msg_req_body()
629 		  req->u.query_payload.vcpi);  in drm_dp_dump_sideband_msg_req_body()
633 		  req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address,  in drm_dp_dump_sideband_msg_req_body()
634 		  req->u.dpcd_read.num_bytes);  in drm_dp_dump_sideband_msg_req_body()
638 		  req->u.dpcd_write.port_number,  in drm_dp_dump_sideband_msg_req_body()
639 		  req->u.dpcd_write.dpcd_address,  in drm_dp_dump_sideband_msg_req_body()
640 		  req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes,  in drm_dp_dump_sideband_msg_req_body()
641 		  req->u.dpcd_write.bytes);  in drm_dp_dump_sideband_msg_req_body()
645 		  req->u.i2c_read.port_number,  in drm_dp_dump_sideband_msg_req_body()
646 		  req->u.i2c_read.num_transactions,  in drm_dp_dump_sideband_msg_req_body()
647 		  req->u.i2c_read.read_i2c_device_id,  in drm_dp_dump_sideband_msg_req_body()
648 		  req->u.i2c_read.num_bytes_read);  in drm_dp_dump_sideband_msg_req_body()
651 		for (i = 0; i < req->u.i2c_read.num_transactions; i++) {  in drm_dp_dump_sideband_msg_req_body()
653 				&req->u.i2c_read.transactions[i];  in drm_dp_dump_sideband_msg_req_body()
656 			  i, rtx->i2c_dev_id, rtx->num_bytes,  in drm_dp_dump_sideband_msg_req_body()
657 			  rtx->no_stop_bit, rtx->i2c_transaction_delay,  in drm_dp_dump_sideband_msg_req_body()
658 			  rtx->num_bytes, rtx->bytes);  in drm_dp_dump_sideband_msg_req_body()
663 		  req->u.i2c_write.port_number,  in drm_dp_dump_sideband_msg_req_body()
664 		  req->u.i2c_write.write_i2c_device_id,  in drm_dp_dump_sideband_msg_req_body()
665 		  req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes,  in drm_dp_dump_sideband_msg_req_body()
666 		  req->u.i2c_write.bytes);  in drm_dp_dump_sideband_msg_req_body()
671 		  req->u.enc_status.stream_id,  in drm_dp_dump_sideband_msg_req_body()
672 		  (int)ARRAY_SIZE(req->u.enc_status.client_id),  in drm_dp_dump_sideband_msg_req_body()
673 		  req->u.enc_status.client_id, req->u.enc_status.stream_event,  in drm_dp_dump_sideband_msg_req_body()
674 		  req->u.enc_status.valid_stream_event,  in drm_dp_dump_sideband_msg_req_body()
675 		  req->u.enc_status.stream_behavior,  in drm_dp_dump_sideband_msg_req_body()
676 		  req->u.enc_status.valid_stream_behavior);  in drm_dp_dump_sideband_msg_req_body()
695 	drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf,  in drm_dp_mst_dump_sideband_msg_tx()
698 		   txmsg->cur_offset, txmsg->cur_len, txmsg->seqno,  in drm_dp_mst_dump_sideband_msg_tx()
699 		   drm_dp_mst_sideband_tx_state_str(txmsg->state),  in drm_dp_mst_dump_sideband_msg_tx()
700 		   txmsg->path_msg, buf);  in drm_dp_mst_dump_sideband_msg_tx()
735 	u8 *buf = raw->msg;  in drm_dp_encode_sideband_reply()
737 	buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);  in drm_dp_encode_sideband_reply()
739 	raw->cur_len = idx;  in drm_dp_encode_sideband_reply()
747 	 * ignore out-of-order messages or messages that are part of a  in drm_dp_sideband_msg_set_header()
750 	if (!hdr->somt && !msg->have_somt)  in drm_dp_sideband_msg_set_header()
754 	msg->curchunk_idx = 0;  in drm_dp_sideband_msg_set_header()
755 	msg->curchunk_len = hdr->msg_len;  in drm_dp_sideband_msg_set_header()
756 	msg->curchunk_hdrlen = hdrlen;  in drm_dp_sideband_msg_set_header()
758 	/* we have already gotten an somt - don't bother parsing */  in drm_dp_sideband_msg_set_header()
759 	if (hdr->somt && msg->have_somt)  in drm_dp_sideband_msg_set_header()
762 	if (hdr->somt) {  in drm_dp_sideband_msg_set_header()
763 		memcpy(&msg->initial_hdr, hdr,  in drm_dp_sideband_msg_set_header()
765 		msg->have_somt = true;  in drm_dp_sideband_msg_set_header()
767 	if (hdr->eomt)  in drm_dp_sideband_msg_set_header()
768 		msg->have_eomt = true;  in drm_dp_sideband_msg_set_header()
779 	memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);  in drm_dp_sideband_append_payload()
780 	msg->curchunk_idx += replybuflen;  in drm_dp_sideband_append_payload()
782 	if (msg->curchunk_idx >= msg->curchunk_len) {  in drm_dp_sideband_append_payload()
784 		crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);  in drm_dp_sideband_append_payload()
785 		if (crc4 != msg->chunk[msg->curchunk_len - 1])  in drm_dp_sideband_append_payload()
788 				       msg->chunk,  msg->curchunk_len, false);  in drm_dp_sideband_append_payload()
790 		memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);  in drm_dp_sideband_append_payload()
791 		msg->curlen += msg->curchunk_len - 1;  in drm_dp_sideband_append_payload()
803 	memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_link_address()
805 	repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_link_address()
807 	if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
809 	for (i = 0; i < repmsg->u.link_addr.nports; i++) {  in drm_dp_sideband_parse_link_address()
810 		if (raw->msg[idx] & 0x80)  in drm_dp_sideband_parse_link_address()
811 			repmsg->u.link_addr.ports[i].input_port = 1;  in drm_dp_sideband_parse_link_address()
813 		repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;  in drm_dp_sideband_parse_link_address()
814 		repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_link_address()
817 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
819 		repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;  in drm_dp_sideband_parse_link_address()
820 		repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;  in drm_dp_sideband_parse_link_address()
821 		if (repmsg->u.link_addr.ports[i].input_port == 0)  in drm_dp_sideband_parse_link_address()
822 			repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;  in drm_dp_sideband_parse_link_address()
824 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
826 		if (repmsg->u.link_addr.ports[i].input_port == 0) {  in drm_dp_sideband_parse_link_address()
827 			repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);  in drm_dp_sideband_parse_link_address()
829 			if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
831 			memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_link_address()
833 			if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
835 			repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_link_address()
836 			repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_link_address()
840 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
846 	DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_link_address()
855 	repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_remote_dpcd_read()
857 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_read()
859 	repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];  in drm_dp_sideband_parse_remote_dpcd_read()
861 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_read()
864 …memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_by…  in drm_dp_sideband_parse_remote_dpcd_read()
867 	DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_dpcd_read()
876 	repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_remote_dpcd_write()
878 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_write()
882 	DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_dpcd_write()
891 	repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_remote_i2c_read_ack()
893 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_i2c_read_ack()
895 	repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];  in drm_dp_sideband_parse_remote_i2c_read_ack()
898 …memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_byte…  in drm_dp_sideband_parse_remote_i2c_read_ack()
901 	DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_i2c_read_ack()
910 	repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_enum_path_resources_ack()
911 	repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1;  in drm_dp_sideband_parse_enum_path_resources_ack()
913 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
915 	repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);  in drm_dp_sideband_parse_enum_path_resources_ack()
917 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
919 	repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);  in drm_dp_sideband_parse_enum_path_resources_ack()
921 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
925 	DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_enum_path_resources_ack()
934 	repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_allocate_payload_ack()
936 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
938 	repmsg->u.allocate_payload.vcpi = raw->msg[idx];  in drm_dp_sideband_parse_allocate_payload_ack()
940 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
942 	repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);  in drm_dp_sideband_parse_allocate_payload_ack()
944 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
948 	DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_allocate_payload_ack()
957 	repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_query_payload_ack()
959 	if (idx > raw->curlen)  in drm_dp_sideband_parse_query_payload_ack()
961 	repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);  in drm_dp_sideband_parse_query_payload_ack()
963 	if (idx > raw->curlen)  in drm_dp_sideband_parse_query_payload_ack()
967 	DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_query_payload_ack()
976 	repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_power_updown_phy_ack()
978 	if (idx > raw->curlen) {  in drm_dp_sideband_parse_power_updown_phy_ack()
980 			      idx, raw->curlen);  in drm_dp_sideband_parse_power_updown_phy_ack()
993 	reply = &repmsg->u.enc_status;  in drm_dp_sideband_parse_query_stream_enc_status()
995 	reply->stream_id = raw->msg[3];  in drm_dp_sideband_parse_query_stream_enc_status()
997 	reply->reply_signed = raw->msg[2] & BIT(0);  in drm_dp_sideband_parse_query_stream_enc_status()
1007 	reply->hdcp_1x_device_present = raw->msg[2] & BIT(4);  in drm_dp_sideband_parse_query_stream_enc_status()
1008 	reply->hdcp_2x_device_present = raw->msg[2] & BIT(3);  in drm_dp_sideband_parse_query_stream_enc_status()
1010 	reply->query_capable_device_present = raw->msg[2] & BIT(5);  in drm_dp_sideband_parse_query_stream_enc_status()
1011 	reply->legacy_device_present = raw->msg[2] & BIT(6);  in drm_dp_sideband_parse_query_stream_enc_status()
1012 	reply->unauthorizable_device_present = raw->msg[2] & BIT(7);  in drm_dp_sideband_parse_query_stream_enc_status()
1014 	reply->auth_completed = !!(raw->msg[1] & BIT(3));  in drm_dp_sideband_parse_query_stream_enc_status()
1015 	reply->encryption_enabled = !!(raw->msg[1] & BIT(4));  in drm_dp_sideband_parse_query_stream_enc_status()
1016 	reply->repeater_present = !!(raw->msg[1] & BIT(5));  in drm_dp_sideband_parse_query_stream_enc_status()
1017 	reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6;  in drm_dp_sideband_parse_query_stream_enc_status()
1027 	msg->reply_type = (raw->msg[0] & 0x80) >> 7;  in drm_dp_sideband_parse_reply()
1028 	msg->req_type = (raw->msg[0] & 0x7f);  in drm_dp_sideband_parse_reply()
1030 	if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_sideband_parse_reply()
1031 		memcpy(msg->u.nak.guid, &raw->msg[1], 16);  in drm_dp_sideband_parse_reply()
1032 		msg->u.nak.reason = raw->msg[17];  in drm_dp_sideband_parse_reply()
1033 		msg->u.nak.nak_data = raw->msg[18];  in drm_dp_sideband_parse_reply()
1037 	switch (msg->req_type) {  in drm_dp_sideband_parse_reply()
1062 		drm_err(mgr->dev, "Got unknown reply 0x%02x (%s)\n",  in drm_dp_sideband_parse_reply()
1063 			msg->req_type, drm_dp_mst_req_type_str(msg->req_type));  in drm_dp_sideband_parse_reply()
1075 	msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;  in drm_dp_sideband_parse_connection_status_notify()
1077 	if (idx > raw->curlen)  in drm_dp_sideband_parse_connection_status_notify()
1080 	memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_connection_status_notify()
1082 	if (idx > raw->curlen)  in drm_dp_sideband_parse_connection_status_notify()
1085 	msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1086 	msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1087 	msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1088 	msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1089 	msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);  in drm_dp_sideband_parse_connection_status_notify()
1093 	drm_dbg_kms(mgr->dev, "connection status reply parse length fail %d %d\n",  in drm_dp_sideband_parse_connection_status_notify()
1094 		    idx, raw->curlen);  in drm_dp_sideband_parse_connection_status_notify()
1104 	msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;  in drm_dp_sideband_parse_resource_status_notify()
1106 	if (idx > raw->curlen)  in drm_dp_sideband_parse_resource_status_notify()
1109 	memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_resource_status_notify()
1111 	if (idx > raw->curlen)  in drm_dp_sideband_parse_resource_status_notify()
1114 	msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);  in drm_dp_sideband_parse_resource_status_notify()
1118 	drm_dbg_kms(mgr->dev, "resource status reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_resource_status_notify()
1127 	msg->req_type = (raw->msg[0] & 0x7f);  in drm_dp_sideband_parse_req()
1129 	switch (msg->req_type) {  in drm_dp_sideband_parse_req()
1135 		drm_err(mgr->dev, "Got unknown request 0x%02x (%s)\n",  in drm_dp_sideband_parse_req()
1136 			msg->req_type, drm_dp_mst_req_type_str(msg->req_type));  in drm_dp_sideband_parse_req()
1168 	msg->path_msg = true;  in build_clear_payload_id_table()
1179 	msg->path_msg = true;  in build_enum_path_resources()
1200 	msg->path_msg = true;  in build_allocate_payload()
1215 	msg->path_msg = true;  in build_power_updown_phy()
1242 	mutex_lock(&mgr->payload_lock);  in drm_dp_mst_assign_payload_id()
1243 	ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);  in drm_dp_mst_assign_payload_id()
1244 	if (ret > mgr->max_payloads) {  in drm_dp_mst_assign_payload_id()
1245 		ret = -EINVAL;  in drm_dp_mst_assign_payload_id()
1246 		drm_dbg_kms(mgr->dev, "out of payload ids %d\n", ret);  in drm_dp_mst_assign_payload_id()
1250 	vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);  in drm_dp_mst_assign_payload_id()
1251 	if (vcpi_ret > mgr->max_payloads) {  in drm_dp_mst_assign_payload_id()
1252 		ret = -EINVAL;  in drm_dp_mst_assign_payload_id()
1253 		drm_dbg_kms(mgr->dev, "out of vcpi ids %d\n", ret);  in drm_dp_mst_assign_payload_id()
1257 	set_bit(ret, &mgr->payload_mask);  in drm_dp_mst_assign_payload_id()
1258 	set_bit(vcpi_ret, &mgr->vcpi_mask);  in drm_dp_mst_assign_payload_id()
1259 	vcpi->vcpi = vcpi_ret + 1;  in drm_dp_mst_assign_payload_id()
1260 	mgr->proposed_vcpis[ret - 1] = vcpi;  in drm_dp_mst_assign_payload_id()
1262 	mutex_unlock(&mgr->payload_lock);  in drm_dp_mst_assign_payload_id()
1274 	mutex_lock(&mgr->payload_lock);  in drm_dp_mst_put_payload_id()
1275 	drm_dbg_kms(mgr->dev, "putting payload %d\n", vcpi);  in drm_dp_mst_put_payload_id()
1276 	clear_bit(vcpi - 1, &mgr->vcpi_mask);  in drm_dp_mst_put_payload_id()
1278 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_mst_put_payload_id()
1279 		if (mgr->proposed_vcpis[i] &&  in drm_dp_mst_put_payload_id()
1280 		    mgr->proposed_vcpis[i]->vcpi == vcpi) {  in drm_dp_mst_put_payload_id()
1281 			mgr->proposed_vcpis[i] = NULL;  in drm_dp_mst_put_payload_id()
1282 			clear_bit(i + 1, &mgr->payload_mask);  in drm_dp_mst_put_payload_id()
1285 	mutex_unlock(&mgr->payload_lock);  in drm_dp_mst_put_payload_id()
1294 	 * All updates to txmsg->state are protected by mgr->qlock, and the two  in check_txmsg_state()
1298 	state = READ_ONCE(txmsg->state);  in check_txmsg_state()
1306 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_wait_tx_reply()
1314 		 * poll-waiting for the MST reply interrupt if we didn't receive  in drm_dp_mst_wait_tx_reply()
1318 		 * Club 3D CAC-1557 TypeC -> DP adapter which for some reason  in drm_dp_mst_wait_tx_reply()
1325 		ret = wait_event_timeout(mgr->tx_waitq,  in drm_dp_mst_wait_tx_reply()
1327 					 mgr->cbs->poll_hpd_irq ?  in drm_dp_mst_wait_tx_reply()
1331 		if (ret || !mgr->cbs->poll_hpd_irq ||  in drm_dp_mst_wait_tx_reply()
1335 		mgr->cbs->poll_hpd_irq(mgr);  in drm_dp_mst_wait_tx_reply()
1338 	mutex_lock(&mgr->qlock);  in drm_dp_mst_wait_tx_reply()
1340 		if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {  in drm_dp_mst_wait_tx_reply()
1341 			ret = -EIO;  in drm_dp_mst_wait_tx_reply()
1345 		drm_dbg_kms(mgr->dev, "timedout msg send %p %d %d\n",  in drm_dp_mst_wait_tx_reply()
1346 			    txmsg, txmsg->state, txmsg->seqno);  in drm_dp_mst_wait_tx_reply()
1349 		ret = -EIO;  in drm_dp_mst_wait_tx_reply()
1352 		if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||  in drm_dp_mst_wait_tx_reply()
1353 		    txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||  in drm_dp_mst_wait_tx_reply()
1354 		    txmsg->state == DRM_DP_SIDEBAND_TX_SENT)  in drm_dp_mst_wait_tx_reply()
1355 			list_del(&txmsg->next);  in drm_dp_mst_wait_tx_reply()
1358 	if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) {  in drm_dp_mst_wait_tx_reply()
1363 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_wait_tx_reply()
1377 	mstb->lct = lct;  in drm_dp_add_mst_branch_device()
1379 		memcpy(mstb->rad, rad, lct / 2);  in drm_dp_add_mst_branch_device()
1380 	INIT_LIST_HEAD(&mstb->ports);  in drm_dp_add_mst_branch_device()
1381 	kref_init(&mstb->topology_kref);  in drm_dp_add_mst_branch_device()
1382 	kref_init(&mstb->malloc_kref);  in drm_dp_add_mst_branch_device()
1391 	if (mstb->port_parent)  in drm_dp_free_mst_branch_device()
1392 		drm_dp_mst_put_port_malloc(mstb->port_parent);  in drm_dp_free_mst_branch_device()
1400  * Topology refcount overview
1405  * two different kinds of refcounts: topology refcounts, and malloc refcounts.
1407  * Topology refcounts are not exposed to drivers, and are handled internally
1409  * in-memory topology state from being changed in the middle of critical
1412  * of the topology until its topology refcount reaches zero. Additionally,
1420  * drm_dp_mst_branch allocated even after all of its topology references have
1422  * branch's last known state before it was disconnected from the topology.
1430  * helpers. Exposing this API to drivers in a race-free manner would take more
1434  * Refcount relationships in a topology
1437  * Let's take a look at why the relationship between topology and malloc
1440  * .. kernel-figure:: dp-mst/topology-figure-1.dot
1442  *    An example of topology and malloc refs in a DP MST topology with two
1443  *    active payloads. Topology refcount increments are indicated by solid
1449  * As you can see in the above figure, every branch increments the topology
1456  * topology would start to look like the figure below.
1458  * .. kernel-figure:: dp-mst/topology-figure-2.dot
1463  * Whenever a port or branch device's topology refcount reaches zero, it will
1464  * decrement the topology refcounts of all its children, the malloc refcount
1466  * #4, this means they both have been disconnected from the topology and freed
1468  * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port
1476  * connected to the topology. In this case, we would travel up the topology as
1479  * .. kernel-figure:: dp-mst/topology-figure-3.dot
1486  * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch
1499 	kref_get(&mstb->malloc_kref);  in drm_dp_mst_get_mstb_malloc()
1500 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref));  in drm_dp_mst_get_mstb_malloc()
1504  * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch
1517 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1);  in drm_dp_mst_put_mstb_malloc()
1518 	kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device);  in drm_dp_mst_put_mstb_malloc()
1526 	drm_dp_mst_put_mstb_malloc(port->parent);  in drm_dp_free_mst_port()
1531  * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port
1550 	kref_get(&port->malloc_kref);  in drm_dp_mst_get_port_malloc()
1551 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref));  in drm_dp_mst_get_port_malloc()
1556  * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port
1568 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1);  in drm_dp_mst_put_port_malloc()
1569 	kref_put(&port->malloc_kref, drm_dp_free_mst_port);  in drm_dp_mst_put_port_malloc()
1594 	for (i = 0; i < history->len; i++) {  in __topology_ref_save()
1595 		if (history->entries[i].backtrace == backtrace) {  in __topology_ref_save()
1596 			entry = &history->entries[i];  in __topology_ref_save()
1604 		int new_len = history->len + 1;  in __topology_ref_save()
1606 		new = krealloc(history->entries, sizeof(*new) * new_len,  in __topology_ref_save()
1611 		entry = &new[history->len];  in __topology_ref_save()
1612 		history->len = new_len;  in __topology_ref_save()
1613 		history->entries = new;  in __topology_ref_save()
1615 		entry->backtrace = backtrace;  in __topology_ref_save()
1616 		entry->type = type;  in __topology_ref_save()
1617 		entry->count = 0;  in __topology_ref_save()
1619 	entry->count++;  in __topology_ref_save()
1620 	entry->ts_nsec = ktime_get_ns();  in __topology_ref_save()
1628 	if (entry_a->ts_nsec > entry_b->ts_nsec)  in topology_ref_history_cmp()
1630 	else if (entry_a->ts_nsec < entry_b->ts_nsec)  in topology_ref_history_cmp()
1631 		return -1;  in topology_ref_history_cmp()
1656 	if (!history->len)  in __dump_topology_ref_history()
1662 	sort(history->entries, history->len, sizeof(*history->entries),  in __dump_topology_ref_history()
1665 	drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n",  in __dump_topology_ref_history()
1668 	for (i = 0; i < history->len; i++) {  in __dump_topology_ref_history()
1670 			&history->entries[i];  in __dump_topology_ref_history()
1673 		u64 ts_nsec = entry->ts_nsec;  in __dump_topology_ref_history()
1676 		nr_entries = stack_depot_fetch(entry->backtrace, &entries);  in __dump_topology_ref_history()
1680 			   entry->count,  in __dump_topology_ref_history()
1681 			   topology_ref_type_to_str(entry->type),  in __dump_topology_ref_history()
1686 	kfree(history->entries);  in __dump_topology_ref_history()
1694 	__dump_topology_ref_history(&mstb->topology_ref_history, mstb,  in drm_dp_mst_dump_mstb_topology_history()
1701 	__dump_topology_ref_history(&port->topology_ref_history, port,  in drm_dp_mst_dump_port_topology_history()
1709 	__topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type);  in save_mstb_topology_ref()
1716 	__topology_ref_save(port->mgr, &port->topology_ref_history, type);  in save_port_topology_ref()
1722 	mutex_lock(&mgr->topology_ref_history_lock);  in topology_ref_history_lock()
1728 	mutex_unlock(&mgr->topology_ref_history_lock);  in topology_ref_history_unlock()
1747 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_destroy_mst_branch_device()
1751 	INIT_LIST_HEAD(&mstb->destroy_next);  in drm_dp_destroy_mst_branch_device()
1754 	 * This can get called under mgr->mutex, so we need to perform the  in drm_dp_destroy_mst_branch_device()
1757 	mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_mst_branch_device()
1758 	list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list);  in drm_dp_destroy_mst_branch_device()
1759 	mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_mst_branch_device()
1760 	queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);  in drm_dp_destroy_mst_branch_device()
1764  * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a
1766  * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of
1768  * Attempts to grab a topology reference to @mstb, if it hasn't yet been
1769  * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has
1770  * reached 0). Holding a topology reference implies that a malloc reference
1771  * will be held to @mstb as long as the user holds the topology reference.
1774  * reference to @mstb. If you already have a topology reference to @mstb, you
1782  * * 1: A topology reference was grabbed successfully
1783  * * 0: @port is no longer in the topology, no reference was grabbed
1790 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_try_get_mstb()
1791 	ret = kref_get_unless_zero(&mstb->topology_kref);  in drm_dp_mst_topology_try_get_mstb()
1793 		drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));  in drm_dp_mst_topology_try_get_mstb()
1797 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_try_get_mstb()
1803  * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a
1805  * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of
1809  * you are already guaranteed to have at least one active topology reference
1818 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_get_mstb()
1821 	WARN_ON(kref_read(&mstb->topology_kref) == 0);  in drm_dp_mst_topology_get_mstb()
1822 	kref_get(&mstb->topology_kref);  in drm_dp_mst_topology_get_mstb()
1823 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));  in drm_dp_mst_topology_get_mstb()
1825 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_get_mstb()
1829  * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch
1831  * @mstb: The &struct drm_dp_mst_branch to release the topology reference from
1833  * Releases a topology reference from @mstb by decrementing
1843 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_put_mstb()
1845 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref) - 1);  in drm_dp_mst_topology_put_mstb()
1848 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_put_mstb()
1849 	kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device);  in drm_dp_mst_topology_put_mstb()
1856 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_destroy_port()
1861 	if (port->input) {  in drm_dp_destroy_port()
1866 	kfree(port->cached_edid);  in drm_dp_destroy_port()
1872 	mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_port()
1873 	list_add(&port->next, &mgr->destroy_port_list);  in drm_dp_destroy_port()
1874 	mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_port()
1875 	queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);  in drm_dp_destroy_port()
1879  * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a
1881  * @port: &struct drm_dp_mst_port to increment the topology refcount of
1883  * Attempts to grab a topology reference to @port, if it hasn't yet been
1884  * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached
1885  * 0). Holding a topology reference implies that a malloc reference will be
1886  * held to @port as long as the user holds the topology reference.
1889  * reference to @port. If you already have a topology reference to @port, you
1897  * * 1: A topology reference was grabbed successfully
1898  * * 0: @port is no longer in the topology, no reference was grabbed
1905 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_try_get_port()
1906 	ret = kref_get_unless_zero(&port->topology_kref);  in drm_dp_mst_topology_try_get_port()
1908 		drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));  in drm_dp_mst_topology_try_get_port()
1912 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_try_get_port()
1917  * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port
1918  * @port: The &struct drm_dp_mst_port to increment the topology refcount of
1922  * you are already guaranteed to have at least one active topology reference
1931 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_get_port()
1933 	WARN_ON(kref_read(&port->topology_kref) == 0);  in drm_dp_mst_topology_get_port()
1934 	kref_get(&port->topology_kref);  in drm_dp_mst_topology_get_port()
1935 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));  in drm_dp_mst_topology_get_port()
1938 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_get_port()
1942  * drm_dp_mst_topology_put_port() - release a topology reference to a port
1943  * @port: The &struct drm_dp_mst_port to release the topology reference from
1945  * Releases a topology reference from @port by decrementing
1954 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_put_port()
1956 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref) - 1);  in drm_dp_mst_topology_put_port()
1959 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_put_port()
1960 	kref_put(&port->topology_kref, drm_dp_destroy_port);  in drm_dp_mst_topology_put_port()
1973 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_topology_get_mstb_validated_locked()
1974 		if (port->mstb) {  in drm_dp_mst_topology_get_mstb_validated_locked()
1976 			    port->mstb, to_find);  in drm_dp_mst_topology_get_mstb_validated_locked()
1990 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_get_mstb_validated()
1991 	if (mgr->mst_primary) {  in drm_dp_mst_topology_get_mstb_validated()
1993 		    mgr->mst_primary, mstb);  in drm_dp_mst_topology_get_mstb_validated()
1998 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_get_mstb_validated()
2008 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_topology_get_port_validated_locked()
2012 		if (port->mstb) {  in drm_dp_mst_topology_get_port_validated_locked()
2014 			    port->mstb, to_find);  in drm_dp_mst_topology_get_port_validated_locked()
2028 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_get_port_validated()
2029 	if (mgr->mst_primary) {  in drm_dp_mst_topology_get_port_validated()
2031 		    mgr->mst_primary, port);  in drm_dp_mst_topology_get_port_validated()
2036 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_get_port_validated()
2045 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_get_port()
2046 		if (port->port_num == port_num) {  in drm_dp_get_port()
2063 	int parent_lct = port->parent->lct;  in drm_dp_calculate_rad()
2065 	int idx = (parent_lct - 1) / 2;  in drm_dp_calculate_rad()
2068 		memcpy(rad, port->parent->rad, idx + 1);  in drm_dp_calculate_rad()
2073 	rad[idx] |= port->port_num << shift;  in drm_dp_calculate_rad()
2097 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_port_set_pdt()
2102 	if (port->pdt == new_pdt && port->mcs == new_mcs)  in drm_dp_port_set_pdt()
2106 	if (port->pdt != DP_PEER_DEVICE_NONE) {  in drm_dp_port_set_pdt()
2107 		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_port_set_pdt()
2109 			 * If the new PDT would also have an i2c bus,  in drm_dp_port_set_pdt()
2114 				port->pdt = new_pdt;  in drm_dp_port_set_pdt()
2115 				port->mcs = new_mcs;  in drm_dp_port_set_pdt()
2119 			/* remove i2c over sideband */  in drm_dp_port_set_pdt()
2122 			mutex_lock(&mgr->lock);  in drm_dp_port_set_pdt()
2123 			drm_dp_mst_topology_put_mstb(port->mstb);  in drm_dp_port_set_pdt()
2124 			port->mstb = NULL;  in drm_dp_port_set_pdt()
2125 			mutex_unlock(&mgr->lock);  in drm_dp_port_set_pdt()
2129 	port->pdt = new_pdt;  in drm_dp_port_set_pdt()
2130 	port->mcs = new_mcs;  in drm_dp_port_set_pdt()
2132 	if (port->pdt != DP_PEER_DEVICE_NONE) {  in drm_dp_port_set_pdt()
2133 		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_port_set_pdt()
2134 			/* add i2c over sideband */  in drm_dp_port_set_pdt()
2140 				ret = -ENOMEM;  in drm_dp_port_set_pdt()
2141 				drm_err(mgr->dev, "Failed to create MSTB for port %p", port);  in drm_dp_port_set_pdt()
2145 			mutex_lock(&mgr->lock);  in drm_dp_port_set_pdt()
2146 			port->mstb = mstb;  in drm_dp_port_set_pdt()
2147 			mstb->mgr = port->mgr;  in drm_dp_port_set_pdt()
2148 			mstb->port_parent = port;  in drm_dp_port_set_pdt()
2155 			mutex_unlock(&mgr->lock);  in drm_dp_port_set_pdt()
2164 		port->pdt = DP_PEER_DEVICE_NONE;  in drm_dp_port_set_pdt()
2169  * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband
2187 	return drm_dp_send_dpcd_read(port->mgr, port,  in drm_dp_mst_dpcd_read()
2192  * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband
2210 	return drm_dp_send_dpcd_write(port->mgr, port,  in drm_dp_mst_dpcd_write()
2218 	memcpy(mstb->guid, guid, 16);  in drm_dp_check_mstb_guid()
2220 	if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {  in drm_dp_check_mstb_guid()
2221 		if (mstb->port_parent) {  in drm_dp_check_mstb_guid()
2222 			ret = drm_dp_send_dpcd_write(mstb->mgr,  in drm_dp_check_mstb_guid()
2223 						     mstb->port_parent,  in drm_dp_check_mstb_guid()
2224 						     DP_GUID, 16, mstb->guid);  in drm_dp_check_mstb_guid()
2226 			ret = drm_dp_dpcd_write(mstb->mgr->aux,  in drm_dp_check_mstb_guid()
2227 						DP_GUID, mstb->guid, 16);  in drm_dp_check_mstb_guid()
2232 		return -EPROTO;  in drm_dp_check_mstb_guid()
2245 	snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);  in build_mst_prop_path()
2246 	for (i = 0; i < (mstb->lct - 1); i++) {  in build_mst_prop_path()
2248 		int port_num = (mstb->rad[i / 2] >> shift) & 0xf;  in build_mst_prop_path()
2250 		snprintf(temp, sizeof(temp), "-%d", port_num);  in build_mst_prop_path()
2253 	snprintf(temp, sizeof(temp), "-%d", pnum);  in build_mst_prop_path()
2258  * drm_dp_mst_connector_late_register() - Late MST connector registration
2271 	drm_dbg_kms(port->mgr->dev, "registering %s remote bus for %s\n",  in drm_dp_mst_connector_late_register()
2272 		    port->aux.name, connector->kdev->kobj.name);  in drm_dp_mst_connector_late_register()
2274 	port->aux.dev = connector->kdev;  in drm_dp_mst_connector_late_register()
2275 	return drm_dp_aux_register_devnode(&port->aux);  in drm_dp_mst_connector_late_register()
2280  * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration
2291 	drm_dbg_kms(port->mgr->dev, "unregistering %s remote bus for %s\n",  in drm_dp_mst_connector_early_unregister()
2292 		    port->aux.name, connector->kdev->kobj.name);  in drm_dp_mst_connector_early_unregister()
2293 	drm_dp_aux_unregister_devnode(&port->aux);  in drm_dp_mst_connector_early_unregister()
2301 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_port_add_connector()
2305 	build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));  in drm_dp_mst_port_add_connector()
2306 	port->connector = mgr->cbs->add_connector(mgr, port, proppath);  in drm_dp_mst_port_add_connector()
2307 	if (!port->connector) {  in drm_dp_mst_port_add_connector()
2308 		ret = -ENOMEM;  in drm_dp_mst_port_add_connector()
2312 	if (port->pdt != DP_PEER_DEVICE_NONE &&  in drm_dp_mst_port_add_connector()
2313 	    drm_dp_mst_is_end_device(port->pdt, port->mcs) &&  in drm_dp_mst_port_add_connector()
2314 	    port->port_num >= DP_MST_LOGICAL_PORT_0)  in drm_dp_mst_port_add_connector()
2315 		port->cached_edid = drm_get_edid(port->connector,  in drm_dp_mst_port_add_connector()
2316 						 &port->aux.ddc);  in drm_dp_mst_port_add_connector()
2318 	drm_connector_register(port->connector);  in drm_dp_mst_port_add_connector()
2322 	drm_err(mgr->dev, "Failed to create connector for port %p: %d\n", port, ret);  in drm_dp_mst_port_add_connector()
2326  * Drop a topology reference, and unlink the port from the in-memory topology
2333 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_unlink_port()
2334 	port->parent->num_ports--;  in drm_dp_mst_topology_unlink_port()
2335 	list_del(&port->next);  in drm_dp_mst_topology_unlink_port()
2336 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_unlink_port()
2350 	kref_init(&port->topology_kref);  in drm_dp_mst_add_port()
2351 	kref_init(&port->malloc_kref);  in drm_dp_mst_add_port()
2352 	port->parent = mstb;  in drm_dp_mst_add_port()
2353 	port->port_num = port_number;  in drm_dp_mst_add_port()
2354 	port->mgr = mgr;  in drm_dp_mst_add_port()
2355 	port->aux.name = "DPMST";  in drm_dp_mst_add_port()
2356 	port->aux.dev = dev->dev;  in drm_dp_mst_add_port()
2357 	port->aux.is_remote = true;  in drm_dp_mst_add_port()
2360 	port->aux.drm_dev = dev;  in drm_dp_mst_add_port()
2361 	drm_dp_remote_aux_init(&port->aux);  in drm_dp_mst_add_port()
2377 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_handle_link_address_port()
2384 	port = drm_dp_get_port(mstb, port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2387 					   port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2389 			return -ENOMEM;  in drm_dp_mst_handle_link_address_port()
2392 	} else if (!port->input && port_msg->input_port && port->connector) {  in drm_dp_mst_handle_link_address_port()
2393 		/* Since port->connector can't be changed here, we create a  in drm_dp_mst_handle_link_address_port()
2399 					   port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2401 			return -ENOMEM;  in drm_dp_mst_handle_link_address_port()
2404 	} else if (port->input && !port_msg->input_port) {  in drm_dp_mst_handle_link_address_port()
2406 	} else if (port->connector) {  in drm_dp_mst_handle_link_address_port()
2410 		drm_modeset_lock(&mgr->base.lock, NULL);  in drm_dp_mst_handle_link_address_port()
2412 		old_ddps = port->ddps;  in drm_dp_mst_handle_link_address_port()
2413 		changed = port->ddps != port_msg->ddps ||  in drm_dp_mst_handle_link_address_port()
2414 			(port->ddps &&  in drm_dp_mst_handle_link_address_port()
2415 			 (port->ldps != port_msg->legacy_device_plug_status ||  in drm_dp_mst_handle_link_address_port()
2416 			  port->dpcd_rev != port_msg->dpcd_revision ||  in drm_dp_mst_handle_link_address_port()
2417 			  port->mcs != port_msg->mcs ||  in drm_dp_mst_handle_link_address_port()
2418 			  port->pdt != port_msg->peer_device_type ||  in drm_dp_mst_handle_link_address_port()
2419 			  port->num_sdp_stream_sinks !=  in drm_dp_mst_handle_link_address_port()
2420 			  port_msg->num_sdp_stream_sinks));  in drm_dp_mst_handle_link_address_port()
2423 	port->input = port_msg->input_port;  in drm_dp_mst_handle_link_address_port()
2424 	if (!port->input)  in drm_dp_mst_handle_link_address_port()
2425 		new_pdt = port_msg->peer_device_type;  in drm_dp_mst_handle_link_address_port()
2426 	new_mcs = port_msg->mcs;  in drm_dp_mst_handle_link_address_port()
2427 	port->ddps = port_msg->ddps;  in drm_dp_mst_handle_link_address_port()
2428 	port->ldps = port_msg->legacy_device_plug_status;  in drm_dp_mst_handle_link_address_port()
2429 	port->dpcd_rev = port_msg->dpcd_revision;  in drm_dp_mst_handle_link_address_port()
2430 	port->num_sdp_streams = port_msg->num_sdp_streams;  in drm_dp_mst_handle_link_address_port()
2431 	port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;  in drm_dp_mst_handle_link_address_port()
2433 	/* manage mstb port lists with mgr lock - take a reference  in drm_dp_mst_handle_link_address_port()
2436 		mutex_lock(&mgr->lock);  in drm_dp_mst_handle_link_address_port()
2438 		list_add(&port->next, &mstb->ports);  in drm_dp_mst_handle_link_address_port()
2439 		mstb->num_ports++;  in drm_dp_mst_handle_link_address_port()
2440 		mutex_unlock(&mgr->lock);  in drm_dp_mst_handle_link_address_port()
2444 	 * Reprobe PBN caps on both hotplug, and when re-probing the link  in drm_dp_mst_handle_link_address_port()
2447 	if (old_ddps != port->ddps || !created) {  in drm_dp_mst_handle_link_address_port()
2448 		if (port->ddps && !port->input) {  in drm_dp_mst_handle_link_address_port()
2454 			port->full_pbn = 0;  in drm_dp_mst_handle_link_address_port()
2471 	if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&  in drm_dp_mst_handle_link_address_port()
2472 	    port->mcs)  in drm_dp_mst_handle_link_address_port()
2475 	if (port->connector)  in drm_dp_mst_handle_link_address_port()
2476 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_link_address_port()
2477 	else if (!port->input)  in drm_dp_mst_handle_link_address_port()
2480 	if (send_link_addr && port->mstb) {  in drm_dp_mst_handle_link_address_port()
2481 		ret = drm_dp_send_link_address(mgr, port->mstb);  in drm_dp_mst_handle_link_address_port()
2494 	if (port->connector)  in drm_dp_mst_handle_link_address_port()
2495 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_link_address_port()
2505 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_handle_conn_stat()
2512 	port = drm_dp_get_port(mstb, conn_stat->port_number);  in drm_dp_mst_handle_conn_stat()
2516 	if (port->connector) {  in drm_dp_mst_handle_conn_stat()
2517 		if (!port->input && conn_stat->input_port) {  in drm_dp_mst_handle_conn_stat()
2524 			mstb->link_address_sent = false;  in drm_dp_mst_handle_conn_stat()
2530 		drm_modeset_lock(&mgr->base.lock, NULL);  in drm_dp_mst_handle_conn_stat()
2531 	} else if (port->input && !conn_stat->input_port) {  in drm_dp_mst_handle_conn_stat()
2534 		mstb->link_address_sent = false;  in drm_dp_mst_handle_conn_stat()
2538 	old_ddps = port->ddps;  in drm_dp_mst_handle_conn_stat()
2539 	port->input = conn_stat->input_port;  in drm_dp_mst_handle_conn_stat()
2540 	port->ldps = conn_stat->legacy_device_plug_status;  in drm_dp_mst_handle_conn_stat()
2541 	port->ddps = conn_stat->displayport_device_plug_status;  in drm_dp_mst_handle_conn_stat()
2543 	if (old_ddps != port->ddps) {  in drm_dp_mst_handle_conn_stat()
2544 		if (port->ddps && !port->input)  in drm_dp_mst_handle_conn_stat()
2547 			port->full_pbn = 0;  in drm_dp_mst_handle_conn_stat()
2550 	new_pdt = port->input ? DP_PEER_DEVICE_NONE : conn_stat->peer_device_type;  in drm_dp_mst_handle_conn_stat()
2551 	new_mcs = conn_stat->message_capability_status;  in drm_dp_mst_handle_conn_stat()
2556 		drm_err(mgr->dev, "Failed to change PDT for port %p: %d\n", port, ret);  in drm_dp_mst_handle_conn_stat()
2560 	if (port->connector)  in drm_dp_mst_handle_conn_stat()
2561 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_conn_stat()
2568 		queue_work(system_long_wq, &mstb->mgr->work);  in drm_dp_mst_handle_conn_stat()
2579 	mutex_lock(&mgr->lock);  in drm_dp_get_mst_branch_device()
2580 	mstb = mgr->mst_primary;  in drm_dp_get_mst_branch_device()
2585 	for (i = 0; i < lct - 1; i++) {  in drm_dp_get_mst_branch_device()
2589 		list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_get_mst_branch_device()
2590 			if (port->port_num == port_num) {  in drm_dp_get_mst_branch_device()
2591 				mstb = port->mstb;  in drm_dp_get_mst_branch_device()
2593 					drm_err(mgr->dev,  in drm_dp_get_mst_branch_device()
2607 	mutex_unlock(&mgr->lock);  in drm_dp_get_mst_branch_device()
2618 	if (memcmp(mstb->guid, guid, 16) == 0)  in get_mst_branch_device_by_guid_helper()
2622 	list_for_each_entry(port, &mstb->ports, next) {  in get_mst_branch_device_by_guid_helper()
2623 		if (!port->mstb)  in get_mst_branch_device_by_guid_helper()
2626 		found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);  in get_mst_branch_device_by_guid_helper()
2643 	mutex_lock(&mgr->lock);  in drm_dp_get_mst_branch_device_by_guid()
2645 	mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);  in drm_dp_get_mst_branch_device_by_guid()
2652 	mutex_unlock(&mgr->lock);  in drm_dp_get_mst_branch_device_by_guid()
2663 	if (!mstb->link_address_sent) {  in drm_dp_check_and_send_link_address()
2671 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_check_and_send_link_address()
2674 		if (port->input || !port->ddps)  in drm_dp_check_and_send_link_address()
2677 		if (port->mstb)  in drm_dp_check_and_send_link_address()
2679 			    mgr, port->mstb);  in drm_dp_check_and_send_link_address()
2699 	struct drm_device *dev = mgr->dev;  in drm_dp_mst_link_probe_work()
2704 	mutex_lock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2706 	mutex_lock(&mgr->lock);  in drm_dp_mst_link_probe_work()
2707 	clear_payload_id_table = !mgr->payload_id_table_cleared;  in drm_dp_mst_link_probe_work()
2708 	mgr->payload_id_table_cleared = true;  in drm_dp_mst_link_probe_work()
2710 	mstb = mgr->mst_primary;  in drm_dp_mst_link_probe_work()
2716 	mutex_unlock(&mgr->lock);  in drm_dp_mst_link_probe_work()
2718 		mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2726 	 * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C  in drm_dp_mst_link_probe_work()
2738 	mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2783 		tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);  in drm_dp_send_sideband_msg()
2785 		ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,  in drm_dp_send_sideband_msg()
2789 			if (ret == -EIO && retries < 5) {  in drm_dp_send_sideband_msg()
2793 			drm_dbg_kms(mgr->dev, "failed to dpcd write %d %d\n", tosend, ret);  in drm_dp_send_sideband_msg()
2795 			return -EIO;  in drm_dp_send_sideband_msg()
2798 		total -= tosend;  in drm_dp_send_sideband_msg()
2806 	struct drm_dp_mst_branch *mstb = txmsg->dst;  in set_hdr_from_dst_qlock()
2809 	req_type = txmsg->msg[0] & 0x7f;  in set_hdr_from_dst_qlock()
2813 		hdr->broadcast = 1;  in set_hdr_from_dst_qlock()
2815 		hdr->broadcast = 0;  in set_hdr_from_dst_qlock()
2816 	hdr->path_msg = txmsg->path_msg;  in set_hdr_from_dst_qlock()
2817 	if (hdr->broadcast) {  in set_hdr_from_dst_qlock()
2818 		hdr->lct = 1;  in set_hdr_from_dst_qlock()
2819 		hdr->lcr = 6;  in set_hdr_from_dst_qlock()
2821 		hdr->lct = mstb->lct;  in set_hdr_from_dst_qlock()
2822 		hdr->lcr = mstb->lct - 1;  in set_hdr_from_dst_qlock()
2825 	memcpy(hdr->rad, mstb->rad, hdr->lct / 2);  in set_hdr_from_dst_qlock()
2841 	if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT)  in process_single_tx_qlock()
2846 	if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED)  in process_single_tx_qlock()
2847 		txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;  in process_single_tx_qlock()
2855 	len = txmsg->cur_len - txmsg->cur_offset;  in process_single_tx_qlock()
2857 	/* 48 - sideband msg size - 1 byte for data CRC, x header bytes */  in process_single_tx_qlock()
2858 	space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);  in process_single_tx_qlock()
2861 	if (len == txmsg->cur_len)  in process_single_tx_qlock()
2869 	memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);  in process_single_tx_qlock()
2885 	txmsg->cur_offset += tosend;  in process_single_tx_qlock()
2886 	if (txmsg->cur_offset == txmsg->cur_len) {  in process_single_tx_qlock()
2887 		txmsg->state = DRM_DP_SIDEBAND_TX_SENT;  in process_single_tx_qlock()
2898 	WARN_ON(!mutex_is_locked(&mgr->qlock));  in process_single_down_tx_qlock()
2901 	if (list_empty(&mgr->tx_msg_downq))  in process_single_down_tx_qlock()
2904 	txmsg = list_first_entry(&mgr->tx_msg_downq,  in process_single_down_tx_qlock()
2908 		drm_dbg_kms(mgr->dev, "failed to send msg in q %d\n", ret);  in process_single_down_tx_qlock()
2909 		list_del(&txmsg->next);  in process_single_down_tx_qlock()
2910 		txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;  in process_single_down_tx_qlock()
2911 		wake_up_all(&mgr->tx_waitq);  in process_single_down_tx_qlock()
2918 	mutex_lock(&mgr->qlock);  in drm_dp_queue_down_tx()
2919 	list_add_tail(&txmsg->next, &mgr->tx_msg_downq);  in drm_dp_queue_down_tx()
2927 	if (list_is_singular(&mgr->tx_msg_downq))  in drm_dp_queue_down_tx()
2929 	mutex_unlock(&mgr->qlock);  in drm_dp_queue_down_tx()
2939 	for (i = 0; i < reply->nports; i++) {  in drm_dp_dump_link_address()
2940 		port_reply = &reply->ports[i];  in drm_dp_dump_link_address()
2941 		drm_dbg_kms(mgr->dev,  in drm_dp_dump_link_address()
2944 			    port_reply->input_port,  in drm_dp_dump_link_address()
2945 			    port_reply->peer_device_type,  in drm_dp_dump_link_address()
2946 			    port_reply->port_number,  in drm_dp_dump_link_address()
2947 			    port_reply->dpcd_revision,  in drm_dp_dump_link_address()
2948 			    port_reply->mcs,  in drm_dp_dump_link_address()
2949 			    port_reply->ddps,  in drm_dp_dump_link_address()
2950 			    port_reply->legacy_device_plug_status,  in drm_dp_dump_link_address()
2951 			    port_reply->num_sdp_streams,  in drm_dp_dump_link_address()
2952 			    port_reply->num_sdp_stream_sinks);  in drm_dp_dump_link_address()
2967 		return -ENOMEM;  in drm_dp_send_link_address()
2969 	txmsg->dst = mstb;  in drm_dp_send_link_address()
2972 	mstb->link_address_sent = true;  in drm_dp_send_link_address()
2978 		drm_err(mgr->dev, "Sending link address failed with %d\n", ret);  in drm_dp_send_link_address()
2981 	if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_link_address()
2982 		drm_err(mgr->dev, "link address NAK received\n");  in drm_dp_send_link_address()
2983 		ret = -EIO;  in drm_dp_send_link_address()
2987 	reply = &txmsg->reply.u.link_addr;  in drm_dp_send_link_address()
2988 	drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports);  in drm_dp_send_link_address()
2991 	ret = drm_dp_check_mstb_guid(mstb, reply->guid);  in drm_dp_send_link_address()
2995 		drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf));  in drm_dp_send_link_address()
2996 		drm_err(mgr->dev, "GUID check on %s failed: %d\n", buf, ret);  in drm_dp_send_link_address()
3000 	for (i = 0; i < reply->nports; i++) {  in drm_dp_send_link_address()
3001 		port_mask |= BIT(reply->ports[i].port_number);  in drm_dp_send_link_address()
3002 		ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev,  in drm_dp_send_link_address()
3003 							  &reply->ports[i]);  in drm_dp_send_link_address()
3010 	/* Prune any ports that are currently a part of mstb in our in-memory  in drm_dp_send_link_address()
3011 	 * topology, but were not seen in this link address. Usually this  in drm_dp_send_link_address()
3012 	 * means that they were removed while the topology was out of sync,  in drm_dp_send_link_address()
3015 	mutex_lock(&mgr->lock);  in drm_dp_send_link_address()
3016 	list_for_each_entry_safe(port, tmp, &mstb->ports, next) {  in drm_dp_send_link_address()
3017 		if (port_mask & BIT(port->port_num))  in drm_dp_send_link_address()
3020 		drm_dbg_kms(mgr->dev, "port %d was not in link address, removing\n",  in drm_dp_send_link_address()
3021 			    port->port_num);  in drm_dp_send_link_address()
3022 		list_del(&port->next);  in drm_dp_send_link_address()
3026 	mutex_unlock(&mgr->lock);  in drm_dp_send_link_address()
3030 		mstb->link_address_sent = false;  in drm_dp_send_link_address()
3046 	txmsg->dst = mstb;  in drm_dp_send_clear_payload_id_table()
3052 	if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_clear_payload_id_table()
3053 		drm_dbg_kms(mgr->dev, "clear payload table id nak received\n");  in drm_dp_send_clear_payload_id_table()
3069 		return -ENOMEM;  in drm_dp_send_enum_path_resources()
3071 	txmsg->dst = mstb;  in drm_dp_send_enum_path_resources()
3072 	build_enum_path_resources(txmsg, port->port_num);  in drm_dp_send_enum_path_resources()
3079 		path_res = &txmsg->reply.u.path_resources;  in drm_dp_send_enum_path_resources()
3081 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_enum_path_resources()
3082 			drm_dbg_kms(mgr->dev, "enum path resources nak received\n");  in drm_dp_send_enum_path_resources()
3084 			if (port->port_num != path_res->port_number)  in drm_dp_send_enum_path_resources()
3087 			drm_dbg_kms(mgr->dev, "enum path resources %d: %d %d\n",  in drm_dp_send_enum_path_resources()
3088 				    path_res->port_number,  in drm_dp_send_enum_path_resources()
3089 				    path_res->full_payload_bw_number,  in drm_dp_send_enum_path_resources()
3090 				    path_res->avail_payload_bw_number);  in drm_dp_send_enum_path_resources()
3096 			if (port->full_pbn != path_res->full_payload_bw_number ||  in drm_dp_send_enum_path_resources()
3097 			    port->fec_capable != path_res->fec_capable)  in drm_dp_send_enum_path_resources()
3100 			port->full_pbn = path_res->full_payload_bw_number;  in drm_dp_send_enum_path_resources()
3101 			port->fec_capable = path_res->fec_capable;  in drm_dp_send_enum_path_resources()
3111 	if (!mstb->port_parent)  in drm_dp_get_last_connected_port_to_mstb()
3114 	if (mstb->port_parent->mstb != mstb)  in drm_dp_get_last_connected_port_to_mstb()
3115 		return mstb->port_parent;  in drm_dp_get_last_connected_port_to_mstb()
3117 	return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);  in drm_dp_get_last_connected_port_to_mstb()
3121  * Searches upwards in the topology starting from mstb to try to find the
3123  * topology. This can be used in order to perform operations like releasing
3136 	mutex_lock(&mgr->lock);  in drm_dp_get_last_connected_port_and_mstb()
3137 	if (!mgr->mst_primary)  in drm_dp_get_last_connected_port_and_mstb()
3145 		if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) {  in drm_dp_get_last_connected_port_and_mstb()
3146 			rmstb = found_port->parent;  in drm_dp_get_last_connected_port_and_mstb()
3147 			*port_num = found_port->port_num;  in drm_dp_get_last_connected_port_and_mstb()
3150 			mstb = found_port->parent;  in drm_dp_get_last_connected_port_and_mstb()
3154 	mutex_unlock(&mgr->lock);  in drm_dp_get_last_connected_port_and_mstb()
3169 	port_num = port->port_num;  in drm_dp_payload_send_msg()
3170 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_payload_send_msg()
3173 							       port->parent,  in drm_dp_payload_send_msg()
3177 			return -EINVAL;  in drm_dp_payload_send_msg()
3182 		ret = -ENOMEM;  in drm_dp_payload_send_msg()
3186 	for (i = 0; i < port->num_sdp_streams; i++)  in drm_dp_payload_send_msg()
3189 	txmsg->dst = mstb;  in drm_dp_payload_send_msg()
3192 			       pbn, port->num_sdp_streams, sinks);  in drm_dp_payload_send_msg()
3199 	 * mstb could also be removed from the topology. In the future, this  in drm_dp_payload_send_msg()
3202 	 * timeout if the topology is still connected to the system.  in drm_dp_payload_send_msg()
3206 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_payload_send_msg()
3207 			ret = -EINVAL;  in drm_dp_payload_send_msg()
3225 		return -EINVAL;  in drm_dp_send_power_updown_phy()
3230 		return -ENOMEM;  in drm_dp_send_power_updown_phy()
3233 	txmsg->dst = port->parent;  in drm_dp_send_power_updown_phy()
3234 	build_power_updown_phy(txmsg, port->port_num, power_up);  in drm_dp_send_power_updown_phy()
3237 	ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);  in drm_dp_send_power_updown_phy()
3239 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_power_updown_phy()
3240 			ret = -EINVAL;  in drm_dp_send_power_updown_phy()
3261 		return -ENOMEM;  in drm_dp_send_query_stream_enc_status()
3265 		ret = -EINVAL;  in drm_dp_send_query_stream_enc_status()
3276 	txmsg->dst = mgr->mst_primary;  in drm_dp_send_query_stream_enc_status()
3278 	build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce);  in drm_dp_send_query_stream_enc_status()
3282 	ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg);  in drm_dp_send_query_stream_enc_status()
3285 	} else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_query_stream_enc_status()
3286 		drm_dbg_kms(mgr->dev, "query encryption status nak received\n");  in drm_dp_send_query_stream_enc_status()
3287 		ret = -ENXIO;  in drm_dp_send_query_stream_enc_status()
3292 	memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));  in drm_dp_send_query_stream_enc_status()
3310 		payload->payload_state = 0;  in drm_dp_create_payload_step1()
3313 	payload->payload_state = DP_PAYLOAD_LOCAL;  in drm_dp_create_payload_step1()
3324 	ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);  in drm_dp_create_payload_step2()
3327 	payload->payload_state = DP_PAYLOAD_REMOTE;  in drm_dp_create_payload_step2()
3336 	drm_dbg_kms(mgr->dev, "\n");  in drm_dp_destroy_payload_step1()
3343 	payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;  in drm_dp_destroy_payload_step1()
3351 	payload->payload_state = 0;  in drm_dp_destroy_payload_step2()
3356  * drm_dp_update_payload_part1() - Execute payload update part 1
3360  * allocate space in the link for them. For 0->slots transitions,
3361  * this step just writes the VCPI to the MST device. For slots->0
3376 	mutex_lock(&mgr->payload_lock);  in drm_dp_update_payload_part1()
3377 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_update_payload_part1()
3378 		struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i];  in drm_dp_update_payload_part1()
3379 		struct drm_dp_payload *payload = &mgr->payloads[i];  in drm_dp_update_payload_part1()
3382 		/* solve the current payloads - compare to the hw ones  in drm_dp_update_payload_part1()
3383 		   - update the hw view */  in drm_dp_update_payload_part1()
3389 			mutex_lock(&mgr->lock);  in drm_dp_update_payload_part1()
3390 			skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);  in drm_dp_update_payload_part1()
3391 			mutex_unlock(&mgr->lock);  in drm_dp_update_payload_part1()
3394 				drm_dbg_kms(mgr->dev,  in drm_dp_update_payload_part1()
3395 					    "Virtual channel %d is not in current topology\n",  in drm_dp_update_payload_part1()
3402 			if (vcpi->num_slots) {  in drm_dp_update_payload_part1()
3406 					if (vcpi->num_slots == payload->num_slots) {  in drm_dp_update_payload_part1()
3407 						cur_slots += vcpi->num_slots;  in drm_dp_update_payload_part1()
3408 						payload->start_slot = req_payload.start_slot;  in drm_dp_update_payload_part1()
3411 						drm_dbg_kms(mgr->dev,  in drm_dp_update_payload_part1()
3413 						mutex_unlock(&mgr->payload_lock);  in drm_dp_update_payload_part1()
3414 						return -EINVAL;  in drm_dp_update_payload_part1()
3420 			req_payload.num_slots = vcpi->num_slots;  in drm_dp_update_payload_part1()
3421 			req_payload.vcpi = vcpi->vcpi;  in drm_dp_update_payload_part1()
3427 		payload->start_slot = req_payload.start_slot;  in drm_dp_update_payload_part1()
3429 		if (payload->num_slots != req_payload.num_slots) {  in drm_dp_update_payload_part1()
3433 				drm_dp_create_payload_step1(mgr, vcpi->vcpi,  in drm_dp_update_payload_part1()
3435 				payload->num_slots = req_payload.num_slots;  in drm_dp_update_payload_part1()
3436 				payload->vcpi = req_payload.vcpi;  in drm_dp_update_payload_part1()
3438 			} else if (payload->num_slots) {  in drm_dp_update_payload_part1()
3439 				payload->num_slots = 0;  in drm_dp_update_payload_part1()
3441 							     payload->vcpi,  in drm_dp_update_payload_part1()
3444 					payload->payload_state;  in drm_dp_update_payload_part1()
3445 				payload->start_slot = 0;  in drm_dp_update_payload_part1()
3447 			payload->payload_state = req_payload.payload_state;  in drm_dp_update_payload_part1()
3455 	for (i = 0; i < mgr->max_payloads; /* do nothing */) {  in drm_dp_update_payload_part1()
3456 		if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) {  in drm_dp_update_payload_part1()
3461 		drm_dbg_kms(mgr->dev, "removing payload %d\n", i);  in drm_dp_update_payload_part1()
3462 		for (j = i; j < mgr->max_payloads - 1; j++) {  in drm_dp_update_payload_part1()
3463 			mgr->payloads[j] = mgr->payloads[j + 1];  in drm_dp_update_payload_part1()
3464 			mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];  in drm_dp_update_payload_part1()
3466 			if (mgr->proposed_vcpis[j] &&  in drm_dp_update_payload_part1()
3467 			    mgr->proposed_vcpis[j]->num_slots) {  in drm_dp_update_payload_part1()
3468 				set_bit(j + 1, &mgr->payload_mask);  in drm_dp_update_payload_part1()
3470 				clear_bit(j + 1, &mgr->payload_mask);  in drm_dp_update_payload_part1()
3474 		memset(&mgr->payloads[mgr->max_payloads - 1], 0,  in drm_dp_update_payload_part1()
3476 		mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;  in drm_dp_update_payload_part1()
3477 		clear_bit(mgr->max_payloads, &mgr->payload_mask);  in drm_dp_update_payload_part1()
3479 	mutex_unlock(&mgr->payload_lock);  in drm_dp_update_payload_part1()
3486  * drm_dp_update_payload_part2() - Execute payload update part 2
3490  * allocate space in the link for them. For 0->slots transitions,
3491  * this step writes the remote VC payload commands. For slots->0
3501 	mutex_lock(&mgr->payload_lock);  in drm_dp_update_payload_part2()
3502 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_update_payload_part2()
3504 		if (!mgr->proposed_vcpis[i])  in drm_dp_update_payload_part2()
3507 		port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);  in drm_dp_update_payload_part2()
3509 		mutex_lock(&mgr->lock);  in drm_dp_update_payload_part2()
3510 		skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);  in drm_dp_update_payload_part2()
3511 		mutex_unlock(&mgr->lock);  in drm_dp_update_payload_part2()
3516 		drm_dbg_kms(mgr->dev, "payload %d %d\n", i, mgr->payloads[i].payload_state);  in drm_dp_update_payload_part2()
3517 		if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {  in drm_dp_update_payload_part2()
3518 			ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);  in drm_dp_update_payload_part2()
3519 		} else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {  in drm_dp_update_payload_part2()
3520 			ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);  in drm_dp_update_payload_part2()
3523 			mutex_unlock(&mgr->payload_lock);  in drm_dp_update_payload_part2()
3527 	mutex_unlock(&mgr->payload_lock);  in drm_dp_update_payload_part2()
3540 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_send_dpcd_read()
3542 		return -EINVAL;  in drm_dp_send_dpcd_read()
3546 		ret = -ENOMEM;  in drm_dp_send_dpcd_read()
3550 	build_dpcd_read(txmsg, port->port_num, offset, size);  in drm_dp_send_dpcd_read()
3551 	txmsg->dst = port->parent;  in drm_dp_send_dpcd_read()
3560 	if (txmsg->reply.reply_type == 1) {  in drm_dp_send_dpcd_read()
3561 		drm_err(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",  in drm_dp_send_dpcd_read()
3562 			mstb, port->port_num, offset, size);  in drm_dp_send_dpcd_read()
3563 		ret = -EIO;  in drm_dp_send_dpcd_read()
3567 	if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) {  in drm_dp_send_dpcd_read()
3568 		ret = -EPROTO;  in drm_dp_send_dpcd_read()
3572 	ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes,  in drm_dp_send_dpcd_read()
3574 	memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret);  in drm_dp_send_dpcd_read()
3592 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_send_dpcd_write()
3594 		return -EINVAL;  in drm_dp_send_dpcd_write()
3598 		ret = -ENOMEM;  in drm_dp_send_dpcd_write()
3602 	build_dpcd_write(txmsg, port->port_num, offset, size, bytes);  in drm_dp_send_dpcd_write()
3603 	txmsg->dst = mstb;  in drm_dp_send_dpcd_write()
3609 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_dpcd_write()
3610 			ret = -EIO;  in drm_dp_send_dpcd_write()
3639 		return -ENOMEM;  in drm_dp_send_up_ack_reply()
3641 	txmsg->dst = mstb;  in drm_dp_send_up_ack_reply()
3644 	mutex_lock(&mgr->qlock);  in drm_dp_send_up_ack_reply()
3647 	mutex_unlock(&mgr->qlock);  in drm_dp_send_up_ack_reply()
3654  * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link
3668 		drm_dbg_kms(mgr->dev, "invalid link rate/lane count: (%d / %d)\n",  in drm_dp_get_vc_payload_bw()
3677  * drm_dp_read_mst_cap() - check whether or not a sink supports MST
3699  * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
3701  * @mst_state: true to enable MST on this connector - false to disable.
3711 	mutex_lock(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_set_mst()
3712 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_set_mst()
3713 	if (mst_state == mgr->mst_state)  in drm_dp_mst_topology_mgr_set_mst()
3716 	mgr->mst_state = mst_state;  in drm_dp_mst_topology_mgr_set_mst()
3723 		WARN_ON(mgr->mst_primary);  in drm_dp_mst_topology_mgr_set_mst()
3726 		ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);  in drm_dp_mst_topology_mgr_set_mst()
3728 			drm_dbg_kms(mgr->dev, "%s: failed to read DPCD, ret %d\n",  in drm_dp_mst_topology_mgr_set_mst()
3729 				    mgr->aux->name, ret);  in drm_dp_mst_topology_mgr_set_mst()
3733 		lane_count = min_t(int, mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, mgr->max_lane_count);  in drm_dp_mst_topology_mgr_set_mst()
3734 		link_rate = min_t(int, drm_dp_bw_code_to_link_rate(mgr->dpcd[1]), mgr->max_link_rate);  in drm_dp_mst_topology_mgr_set_mst()
3735 		mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr,  in drm_dp_mst_topology_mgr_set_mst()
3738 		if (mgr->pbn_div == 0) {  in drm_dp_mst_topology_mgr_set_mst()
3739 			ret = -EINVAL;  in drm_dp_mst_topology_mgr_set_mst()
3746 			ret = -ENOMEM;  in drm_dp_mst_topology_mgr_set_mst()
3749 		mstb->mgr = mgr;  in drm_dp_mst_topology_mgr_set_mst()
3752 		mgr->mst_primary = mstb;  in drm_dp_mst_topology_mgr_set_mst()
3753 		drm_dp_mst_topology_get_mstb(mgr->mst_primary);  in drm_dp_mst_topology_mgr_set_mst()
3755 		ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_set_mst()
3766 		queue_work(system_long_wq, &mgr->work);  in drm_dp_mst_topology_mgr_set_mst()
3771 		mstb = mgr->mst_primary;  in drm_dp_mst_topology_mgr_set_mst()
3772 		mgr->mst_primary = NULL;  in drm_dp_mst_topology_mgr_set_mst()
3774 		drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);  in drm_dp_mst_topology_mgr_set_mst()
3776 		memset(mgr->payloads, 0,  in drm_dp_mst_topology_mgr_set_mst()
3777 		       mgr->max_payloads * sizeof(mgr->payloads[0]));  in drm_dp_mst_topology_mgr_set_mst()
3778 		memset(mgr->proposed_vcpis, 0,  in drm_dp_mst_topology_mgr_set_mst()
3779 		       mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]));  in drm_dp_mst_topology_mgr_set_mst()
3780 		mgr->payload_mask = 0;  in drm_dp_mst_topology_mgr_set_mst()
3781 		set_bit(0, &mgr->payload_mask);  in drm_dp_mst_topology_mgr_set_mst()
3782 		mgr->vcpi_mask = 0;  in drm_dp_mst_topology_mgr_set_mst()
3783 		mgr->payload_id_table_cleared = false;  in drm_dp_mst_topology_mgr_set_mst()
3787 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_set_mst()
3788 	mutex_unlock(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_set_mst()
3801 	/* The link address will need to be re-sent on resume */  in drm_dp_mst_topology_mgr_invalidate_mstb()
3802 	mstb->link_address_sent = false;  in drm_dp_mst_topology_mgr_invalidate_mstb()
3804 	list_for_each_entry(port, &mstb->ports, next)  in drm_dp_mst_topology_mgr_invalidate_mstb()
3805 		if (port->mstb)  in drm_dp_mst_topology_mgr_invalidate_mstb()
3806 			drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb);  in drm_dp_mst_topology_mgr_invalidate_mstb()
3810  * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
3818 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3819 	drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_suspend()
3821 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3822 	flush_work(&mgr->up_req_work);  in drm_dp_mst_topology_mgr_suspend()
3823 	flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_suspend()
3824 	flush_work(&mgr->delayed_destroy_work);  in drm_dp_mst_topology_mgr_suspend()
3826 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3827 	if (mgr->mst_state && mgr->mst_primary)  in drm_dp_mst_topology_mgr_suspend()
3828 		drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary);  in drm_dp_mst_topology_mgr_suspend()
3829 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3834  * drm_dp_mst_topology_mgr_resume() - resume the MST manager
3836  * @sync: whether or not to perform topology reprobing synchronously
3841  * If the device fails this returns -1, and the driver should do
3850  * Returns: -1 if the MST topology was removed while we were suspended, 0
3859 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3860 	if (!mgr->mst_primary)  in drm_dp_mst_topology_mgr_resume()
3863 	ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd,  in drm_dp_mst_topology_mgr_resume()
3866 		drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3870 	ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_resume()
3875 		drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3880 	ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);  in drm_dp_mst_topology_mgr_resume()
3882 		drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3886 	ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid);  in drm_dp_mst_topology_mgr_resume()
3888 		drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3893 	 * For the final step of resuming the topology, we need to bring the  in drm_dp_mst_topology_mgr_resume()
3894 	 * state of our in-memory topology back into sync with reality. So,  in drm_dp_mst_topology_mgr_resume()
3897 	queue_work(system_long_wq, &mgr->work);  in drm_dp_mst_topology_mgr_resume()
3898 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3901 		drm_dbg_kms(mgr->dev,  in drm_dp_mst_topology_mgr_resume()
3902 			    "Waiting for link probe work to finish re-syncing topology...\n");  in drm_dp_mst_topology_mgr_resume()
3903 		flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_resume()
3909 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3910 	return -1;  in drm_dp_mst_topology_mgr_resume()
3925 		up ? &mgr->up_req_recv : &mgr->down_rep_recv;  in drm_dp_get_one_sb_msg()
3932 	len = min(mgr->max_dpcd_transaction_bytes, 16);  in drm_dp_get_one_sb_msg()
3933 	ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len);  in drm_dp_get_one_sb_msg()
3935 		drm_dbg_kms(mgr->dev, "failed to read DPCD down rep %d %d\n", len, ret);  in drm_dp_get_one_sb_msg()
3943 		drm_dbg_kms(mgr->dev, "ERROR: failed header\n");  in drm_dp_get_one_sb_msg()
3951 			drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr.lct);  in drm_dp_get_one_sb_msg()
3957 		drm_dbg_kms(mgr->dev, "sideband msg set header failed %d\n", replyblock[0]);  in drm_dp_get_one_sb_msg()
3961 	replylen = min(msg->curchunk_len, (u8)(len - hdrlen));  in drm_dp_get_one_sb_msg()
3964 		drm_dbg_kms(mgr->dev, "sideband msg build failed %d\n", replyblock[0]);  in drm_dp_get_one_sb_msg()
3968 	replylen = msg->curchunk_len + msg->curchunk_hdrlen - len;  in drm_dp_get_one_sb_msg()
3971 		len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);  in drm_dp_get_one_sb_msg()
3972 		ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,  in drm_dp_get_one_sb_msg()
3975 			drm_dbg_kms(mgr->dev, "failed to read a chunk (len %d, ret %d)\n",  in drm_dp_get_one_sb_msg()
3982 			drm_dbg_kms(mgr->dev, "failed to build sideband msg\n");  in drm_dp_get_one_sb_msg()
3987 		replylen -= len;  in drm_dp_get_one_sb_msg()
3996 	struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv;  in drm_dp_mst_handle_down_rep()
4001 	/* Multi-packet message transmission, don't clear the reply */  in drm_dp_mst_handle_down_rep()
4002 	if (!msg->have_eomt)  in drm_dp_mst_handle_down_rep()
4006 	mutex_lock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
4007 	txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,  in drm_dp_mst_handle_down_rep()
4009 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
4012 	if (!txmsg || txmsg->dst != mstb) {  in drm_dp_mst_handle_down_rep()
4015 		hdr = &msg->initial_hdr;  in drm_dp_mst_handle_down_rep()
4016 		drm_dbg_kms(mgr->dev, "Got MST reply with no msg %p %d %d %02x %02x\n",  in drm_dp_mst_handle_down_rep()
4017 			    mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg[0]);  in drm_dp_mst_handle_down_rep()
4021 	drm_dp_sideband_parse_reply(mgr, msg, &txmsg->reply);  in drm_dp_mst_handle_down_rep()
4023 	if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_handle_down_rep()
4024 		drm_dbg_kms(mgr->dev,  in drm_dp_mst_handle_down_rep()
4026 			    txmsg->reply.req_type,  in drm_dp_mst_handle_down_rep()
4027 			    drm_dp_mst_req_type_str(txmsg->reply.req_type),  in drm_dp_mst_handle_down_rep()
4028 			    txmsg->reply.u.nak.reason,  in drm_dp_mst_handle_down_rep()
4029 			    drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),  in drm_dp_mst_handle_down_rep()
4030 			    txmsg->reply.u.nak.nak_data);  in drm_dp_mst_handle_down_rep()
4036 	mutex_lock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
4037 	txmsg->state = DRM_DP_SIDEBAND_TX_RX;  in drm_dp_mst_handle_down_rep()
4038 	list_del(&txmsg->next);  in drm_dp_mst_handle_down_rep()
4039 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
4041 	wake_up_all(&mgr->tx_waitq);  in drm_dp_mst_handle_down_rep()
4059 	struct drm_dp_sideband_msg_req_body *msg = &up_req->msg;  in drm_dp_mst_process_up_req()
4060 	struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr;  in drm_dp_mst_process_up_req()
4063 	if (hdr->broadcast) {  in drm_dp_mst_process_up_req()
4066 		if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY)  in drm_dp_mst_process_up_req()
4067 			guid = msg->u.conn_stat.guid;  in drm_dp_mst_process_up_req()
4068 		else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)  in drm_dp_mst_process_up_req()
4069 			guid = msg->u.resource_stat.guid;  in drm_dp_mst_process_up_req()
4074 		mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad);  in drm_dp_mst_process_up_req()
4078 		drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr->lct);  in drm_dp_mst_process_up_req()
4083 	if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) {  in drm_dp_mst_process_up_req()
4084 		drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat);  in drm_dp_mst_process_up_req()
4100 	mutex_lock(&mgr->probe_lock);  in drm_dp_mst_up_req_work()
4102 		mutex_lock(&mgr->up_req_lock);  in drm_dp_mst_up_req_work()
4103 		up_req = list_first_entry_or_null(&mgr->up_req_list,  in drm_dp_mst_up_req_work()
4107 			list_del(&up_req->next);  in drm_dp_mst_up_req_work()
4108 		mutex_unlock(&mgr->up_req_lock);  in drm_dp_mst_up_req_work()
4116 	mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_up_req_work()
4119 		drm_kms_helper_hotplug_event(mgr->dev);  in drm_dp_mst_up_req_work()
4129 	if (!mgr->up_req_recv.have_eomt)  in drm_dp_mst_handle_up_req()
4134 		return -ENOMEM;  in drm_dp_mst_handle_up_req()
4136 	INIT_LIST_HEAD(&up_req->next);  in drm_dp_mst_handle_up_req()
4138 	drm_dp_sideband_parse_req(mgr, &mgr->up_req_recv, &up_req->msg);  in drm_dp_mst_handle_up_req()
4140 	if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&  in drm_dp_mst_handle_up_req()
4141 	    up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4142 		drm_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n",  in drm_dp_mst_handle_up_req()
4143 			    up_req->msg.req_type);  in drm_dp_mst_handle_up_req()
4148 	drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type,  in drm_dp_mst_handle_up_req()
4151 	if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4153 			&up_req->msg.u.conn_stat;  in drm_dp_mst_handle_up_req()
4155 		drm_dbg_kms(mgr->dev, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n",  in drm_dp_mst_handle_up_req()
4156 			    conn_stat->port_number,  in drm_dp_mst_handle_up_req()
4157 			    conn_stat->legacy_device_plug_status,  in drm_dp_mst_handle_up_req()
4158 			    conn_stat->displayport_device_plug_status,  in drm_dp_mst_handle_up_req()
4159 			    conn_stat->message_capability_status,  in drm_dp_mst_handle_up_req()
4160 			    conn_stat->input_port,  in drm_dp_mst_handle_up_req()
4161 			    conn_stat->peer_device_type);  in drm_dp_mst_handle_up_req()
4162 	} else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4164 			&up_req->msg.u.resource_stat;  in drm_dp_mst_handle_up_req()
4166 		drm_dbg_kms(mgr->dev, "Got RSN: pn: %d avail_pbn %d\n",  in drm_dp_mst_handle_up_req()
4167 			    res_stat->port_number,  in drm_dp_mst_handle_up_req()
4168 			    res_stat->available_pbn);  in drm_dp_mst_handle_up_req()
4171 	up_req->hdr = mgr->up_req_recv.initial_hdr;  in drm_dp_mst_handle_up_req()
4172 	mutex_lock(&mgr->up_req_lock);  in drm_dp_mst_handle_up_req()
4173 	list_add_tail(&up_req->next, &mgr->up_req_list);  in drm_dp_mst_handle_up_req()
4174 	mutex_unlock(&mgr->up_req_lock);  in drm_dp_mst_handle_up_req()
4175 	queue_work(system_long_wq, &mgr->up_req_work);  in drm_dp_mst_handle_up_req()
4178 	memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));  in drm_dp_mst_handle_up_req()
4183  * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
4190  * topology manager will process the sideband messages received as a result
4200 	if (sc != mgr->sink_count) {  in drm_dp_mst_hpd_irq()
4201 		mgr->sink_count = sc;  in drm_dp_mst_hpd_irq()
4221  * drm_dp_mst_detect_port() - get connection status for an MST port
4242 	ret = drm_modeset_lock(&mgr->base.lock, ctx);  in drm_dp_mst_detect_port()
4248 	if (!port->ddps)  in drm_dp_mst_detect_port()
4251 	switch (port->pdt) {  in drm_dp_mst_detect_port()
4255 		if (!port->mcs)  in drm_dp_mst_detect_port()
4261 		/* for logical ports - cache the EDID */  in drm_dp_mst_detect_port()
4262 		if (port->port_num >= DP_MST_LOGICAL_PORT_0 && !port->cached_edid)  in drm_dp_mst_detect_port()
4263 			port->cached_edid = drm_get_edid(connector, &port->aux.ddc);  in drm_dp_mst_detect_port()
4266 		if (port->ldps)  in drm_dp_mst_detect_port()
4277  * drm_dp_mst_get_edid() - get EDID for an MST port
4295 	if (port->cached_edid)  in drm_dp_mst_get_edid()
4296 		edid = drm_edid_duplicate(port->cached_edid);  in drm_dp_mst_get_edid()
4298 		edid = drm_get_edid(connector, &port->aux.ddc);  in drm_dp_mst_get_edid()
4300 	port->has_audio = drm_detect_monitor_audio(edid);  in drm_dp_mst_get_edid()
4307  * drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value
4323 	num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);  in drm_dp_find_vcpi_slots()
4325 	/* max. time slots - one slot for MTP header */  in drm_dp_find_vcpi_slots()
4327 		return -ENOSPC;  in drm_dp_find_vcpi_slots()
4337 	/* max. time slots - one slot for MTP header */  in drm_dp_init_vcpi()
4339 		return -ENOSPC;  in drm_dp_init_vcpi()
4341 	vcpi->pbn = pbn;  in drm_dp_init_vcpi()
4342 	vcpi->aligned_pbn = slots * mgr->pbn_div;  in drm_dp_init_vcpi()
4343 	vcpi->num_slots = slots;  in drm_dp_init_vcpi()
4352  * drm_dp_atomic_find_vcpi_slots() - Find and add VCPI slots to the state
4354  * @mgr: MST topology manager for the port
4396 	list_for_each_entry(pos, &topology_state->vcpis, next) {  in drm_dp_atomic_find_vcpi_slots()
4397 		if (pos->port == port) {  in drm_dp_atomic_find_vcpi_slots()
4399 			prev_slots = vcpi->vcpi;  in drm_dp_atomic_find_vcpi_slots()
4400 			prev_bw = vcpi->pbn;  in drm_dp_atomic_find_vcpi_slots()
4408 				drm_err(mgr->dev,  in drm_dp_atomic_find_vcpi_slots()
4411 				return -EINVAL;  in drm_dp_atomic_find_vcpi_slots()
4423 		pbn_div = mgr->pbn_div;  in drm_dp_atomic_find_vcpi_slots()
4427 	drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n",  in drm_dp_atomic_find_vcpi_slots()
4428 		       port->connector->base.id, port->connector->name,  in drm_dp_atomic_find_vcpi_slots()
4430 	drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n",  in drm_dp_atomic_find_vcpi_slots()
4431 		       port->connector->base.id, port->connector->name,  in drm_dp_atomic_find_vcpi_slots()
4438 			return -ENOMEM;  in drm_dp_atomic_find_vcpi_slots()
4441 		vcpi->port = port;  in drm_dp_atomic_find_vcpi_slots()
4442 		list_add(&vcpi->next, &topology_state->vcpis);  in drm_dp_atomic_find_vcpi_slots()
4444 	vcpi->vcpi = req_slots;  in drm_dp_atomic_find_vcpi_slots()
4445 	vcpi->pbn = pbn;  in drm_dp_atomic_find_vcpi_slots()
4452  * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
4454  * @mgr: MST topology manager for the port
4489 	list_for_each_entry(pos, &topology_state->vcpis, next) {  in drm_dp_atomic_release_vcpi_slots()
4490 		if (pos->port == port) {  in drm_dp_atomic_release_vcpi_slots()
4496 		drm_err(mgr->dev, "no VCPI for [MST PORT:%p] found in mst state %p\n",  in drm_dp_atomic_release_vcpi_slots()
4497 			port, &topology_state->base);  in drm_dp_atomic_release_vcpi_slots()
4498 		return -EINVAL;  in drm_dp_atomic_release_vcpi_slots()
4501 	drm_dbg_atomic(mgr->dev, "[MST PORT:%p] VCPI %d -> 0\n", port, pos->vcpi);  in drm_dp_atomic_release_vcpi_slots()
4502 	if (pos->vcpi) {  in drm_dp_atomic_release_vcpi_slots()
4504 		pos->vcpi = 0;  in drm_dp_atomic_release_vcpi_slots()
4505 		pos->pbn = 0;  in drm_dp_atomic_release_vcpi_slots()
4513  * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
4531 	if (port->vcpi.vcpi > 0) {  in drm_dp_mst_allocate_vcpi()
4532 		drm_dbg_kms(mgr->dev,  in drm_dp_mst_allocate_vcpi()
4533 			    "payload: vcpi %d already allocated for pbn %d - requested pbn %d\n",  in drm_dp_mst_allocate_vcpi()
4534 			    port->vcpi.vcpi, port->vcpi.pbn, pbn);  in drm_dp_mst_allocate_vcpi()
4535 		if (pbn == port->vcpi.pbn) {  in drm_dp_mst_allocate_vcpi()
4541 	ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);  in drm_dp_mst_allocate_vcpi()
4543 		drm_dbg_kms(mgr->dev, "failed to init vcpi slots=%d max=63 ret=%d\n",  in drm_dp_mst_allocate_vcpi()
4544 			    DIV_ROUND_UP(pbn, mgr->pbn_div), ret);  in drm_dp_mst_allocate_vcpi()
4548 	drm_dbg_kms(mgr->dev, "initing vcpi for pbn=%d slots=%d\n", pbn, port->vcpi.num_slots);  in drm_dp_mst_allocate_vcpi()
4567 	slots = port->vcpi.num_slots;  in drm_dp_mst_get_vcpi_slots()
4574  * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
4587 	port->vcpi.num_slots = 0;  in drm_dp_mst_reset_vcpi_slots()
4592  * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
4604 	if (!port->vcpi.vcpi)  in drm_dp_mst_deallocate_vcpi()
4607 	mutex_lock(&mgr->lock);  in drm_dp_mst_deallocate_vcpi()
4608 	skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);  in drm_dp_mst_deallocate_vcpi()
4609 	mutex_unlock(&mgr->lock);  in drm_dp_mst_deallocate_vcpi()
4614 	drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);  in drm_dp_mst_deallocate_vcpi()
4615 	port->vcpi.num_slots = 0;  in drm_dp_mst_deallocate_vcpi()
4616 	port->vcpi.pbn = 0;  in drm_dp_mst_deallocate_vcpi()
4617 	port->vcpi.aligned_pbn = 0;  in drm_dp_mst_deallocate_vcpi()
4618 	port->vcpi.vcpi = 0;  in drm_dp_mst_deallocate_vcpi()
4630 	drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,  in drm_dp_dpcd_write_payload()
4634 	payload_alloc[1] = payload->start_slot;  in drm_dp_dpcd_write_payload()
4635 	payload_alloc[2] = payload->num_slots;  in drm_dp_dpcd_write_payload()
4637 	ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);  in drm_dp_dpcd_write_payload()
4639 		drm_dbg_kms(mgr->dev, "failed to write payload allocation %d\n", ret);  in drm_dp_dpcd_write_payload()
4644 	ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);  in drm_dp_dpcd_write_payload()
4646 		drm_dbg_kms(mgr->dev, "failed to read payload table status %d\n", ret);  in drm_dp_dpcd_write_payload()
4656 		drm_dbg_kms(mgr->dev, "status not set after read payload table status %d\n",  in drm_dp_dpcd_write_payload()
4658 		ret = -EINVAL;  in drm_dp_dpcd_write_payload()
4679  * drm_dp_check_act_status() - Polls for ACT handled status.
4683  * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really
4700 	ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,  in drm_dp_check_act_status()
4704 		drm_err(mgr->dev, "Failed to get ACT after %dms, last status: %02x\n",  in drm_dp_check_act_status()
4706 		return -EINVAL;  in drm_dp_check_act_status()
4709 		 * Failure here isn't unexpected - the hub may have  in drm_dp_check_act_status()
4712 		drm_dbg_kms(mgr->dev, "Failed to read payload table status: %d\n", status);  in drm_dp_check_act_status()
4721  * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
4757 	queue_work(system_long_wq, &mgr->tx_work);  in drm_dp_mst_kick_tx()
4786 	int tabs = mstb->lct;  in drm_dp_mst_dump_mstb()
4794 	seq_printf(m, "%smstb - [%p]: num_ports: %d\n", prefix, mstb, mstb->num_ports);  in drm_dp_mst_dump_mstb()
4795 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_dump_mstb()
4796 		seq_printf(m, "%sport %d - [%p] (%s - %s): ddps: %d, ldps: %d, sdp: %d/%d, fec: %s, conn: %p\n",   in drm_dp_mst_dump_mstb()
4798 			   port->port_num,  in drm_dp_mst_dump_mstb()
4800 			   port->input ? "input" : "output",  in drm_dp_mst_dump_mstb()
4801 			   pdt_to_string(port->pdt),  in drm_dp_mst_dump_mstb()
4802 			   port->ddps,  in drm_dp_mst_dump_mstb()
4803 			   port->ldps,  in drm_dp_mst_dump_mstb()
4804 			   port->num_sdp_streams,  in drm_dp_mst_dump_mstb()
4805 			   port->num_sdp_stream_sinks,  in drm_dp_mst_dump_mstb()
4806 			   port->fec_capable ? "true" : "false",  in drm_dp_mst_dump_mstb()
4807 			   port->connector);  in drm_dp_mst_dump_mstb()
4808 		if (port->mstb)  in drm_dp_mst_dump_mstb()
4809 			drm_dp_mst_dump_mstb(m, port->mstb);  in drm_dp_mst_dump_mstb()
4821 		if (drm_dp_dpcd_read(mgr->aux,  in dump_dp_payload_table()
4835 	mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);  in fetch_monitor_name()
4840  * drm_dp_mst_dump_topology(): dump topology to seq file.
4842  * @mgr: manager to dump current topology for.
4844  * helper to dump MST topology to a seq file for debugfs.
4852 	mutex_lock(&mgr->lock);  in drm_dp_mst_dump_topology()
4853 	if (mgr->mst_primary)  in drm_dp_mst_dump_topology()
4854 		drm_dp_mst_dump_mstb(m, mgr->mst_primary);  in drm_dp_mst_dump_topology()
4857 	mutex_unlock(&mgr->lock);  in drm_dp_mst_dump_topology()
4859 	mutex_lock(&mgr->payload_lock);  in drm_dp_mst_dump_topology()
4861 …ayload_mask: %lx, vcpi_mask: %lx, max_payloads: %d\n", mgr->payload_mask, mgr->vcpi_mask, mgr->max…  in drm_dp_mst_dump_topology()
4864 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_mst_dump_topology()
4865 		if (mgr->proposed_vcpis[i]) {  in drm_dp_mst_dump_topology()
4868 			port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);  in drm_dp_mst_dump_topology()
4872 				   port->port_num,  in drm_dp_mst_dump_topology()
4873 				   port->vcpi.vcpi,  in drm_dp_mst_dump_topology()
4874 				   port->vcpi.num_slots,  in drm_dp_mst_dump_topology()
4877 			seq_printf(m, "%6d - Unused\n", i);  in drm_dp_mst_dump_topology()
4881 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_mst_dump_topology()
4884 			   mgr->payloads[i].payload_state,  in drm_dp_mst_dump_topology()
4885 			   mgr->payloads[i].start_slot,  in drm_dp_mst_dump_topology()
4886 			   mgr->payloads[i].num_slots);  in drm_dp_mst_dump_topology()
4888 	mutex_unlock(&mgr->payload_lock);  in drm_dp_mst_dump_topology()
4891 	mutex_lock(&mgr->lock);  in drm_dp_mst_dump_topology()
4892 	if (mgr->mst_primary) {  in drm_dp_mst_dump_topology()
4896 		ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);  in drm_dp_mst_dump_topology()
4903 		ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);  in drm_dp_mst_dump_topology()
4910 		ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);  in drm_dp_mst_dump_topology()
4918 		ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);  in drm_dp_mst_dump_topology()
4934 	mutex_unlock(&mgr->lock);  in drm_dp_mst_dump_topology()
4943 	mutex_lock(&mgr->qlock);  in drm_dp_tx_work()
4944 	if (!list_empty(&mgr->tx_msg_downq))  in drm_dp_tx_work()
4946 	mutex_unlock(&mgr->qlock);  in drm_dp_tx_work()
4952 	drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs);  in drm_dp_delayed_destroy_port()
4954 	if (port->connector) {  in drm_dp_delayed_destroy_port()
4955 		drm_connector_unregister(port->connector);  in drm_dp_delayed_destroy_port()
4956 		drm_connector_put(port->connector);  in drm_dp_delayed_destroy_port()
4965 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_delayed_destroy_mstb()
4970 	mutex_lock(&mgr->lock);  in drm_dp_delayed_destroy_mstb()
4971 	list_for_each_entry_safe(port, port_tmp, &mstb->ports, next) {  in drm_dp_delayed_destroy_mstb()
4972 		list_del(&port->next);  in drm_dp_delayed_destroy_mstb()
4975 	mutex_unlock(&mgr->lock);  in drm_dp_delayed_destroy_mstb()
4978 	mutex_lock(&mstb->mgr->qlock);  in drm_dp_delayed_destroy_mstb()
4979 	list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next) {  in drm_dp_delayed_destroy_mstb()
4980 		if (txmsg->dst != mstb)  in drm_dp_delayed_destroy_mstb()
4983 		txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;  in drm_dp_delayed_destroy_mstb()
4984 		list_del(&txmsg->next);  in drm_dp_delayed_destroy_mstb()
4987 	mutex_unlock(&mstb->mgr->qlock);  in drm_dp_delayed_destroy_mstb()
4990 		wake_up_all(&mstb->mgr->tx_waitq);  in drm_dp_delayed_destroy_mstb()
5004 	 * connector lock before destroying the mstb/port, to avoid AB->BA  in drm_dp_delayed_destroy_work()
5013 			mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5014 			mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list,  in drm_dp_delayed_destroy_work()
5018 				list_del(&mstb->destroy_next);  in drm_dp_delayed_destroy_work()
5019 			mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5031 			mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5032 			port = list_first_entry_or_null(&mgr->destroy_port_list,  in drm_dp_delayed_destroy_work()
5036 				list_del(&port->next);  in drm_dp_delayed_destroy_work()
5037 			mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5049 		drm_kms_helper_hotplug_event(mgr->dev);  in drm_dp_delayed_destroy_work()
5056 		to_dp_mst_topology_state(obj->state);  in drm_dp_mst_duplicate_state()
5063 	__drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);  in drm_dp_mst_duplicate_state()
5065 	INIT_LIST_HEAD(&state->vcpis);  in drm_dp_mst_duplicate_state()
5067 	list_for_each_entry(pos, &old_state->vcpis, next) {  in drm_dp_mst_duplicate_state()
5069 		if (!pos->vcpi)  in drm_dp_mst_duplicate_state()
5076 		drm_dp_mst_get_port_malloc(vcpi->port);  in drm_dp_mst_duplicate_state()
5077 		list_add(&vcpi->next, &state->vcpis);  in drm_dp_mst_duplicate_state()
5080 	return &state->base;  in drm_dp_mst_duplicate_state()
5083 	list_for_each_entry_safe(pos, vcpi, &state->vcpis, next) {  in drm_dp_mst_duplicate_state()
5084 		drm_dp_mst_put_port_malloc(pos->port);  in drm_dp_mst_duplicate_state()
5099 	list_for_each_entry_safe(pos, tmp, &mst_state->vcpis, next) {  in drm_dp_mst_destroy_state()
5100 		/* We only keep references to ports with non-zero VCPIs */  in drm_dp_mst_destroy_state()
5101 		if (pos->vcpi)  in drm_dp_mst_destroy_state()
5102 			drm_dp_mst_put_port_malloc(pos->port);  in drm_dp_mst_destroy_state()
5112 	while (port->parent) {  in drm_dp_mst_port_downstream_of_branch()
5113 		if (port->parent == branch)  in drm_dp_mst_port_downstream_of_branch()
5116 		if (port->parent->port_parent)  in drm_dp_mst_port_downstream_of_branch()
5117 			port = port->parent->port_parent;  in drm_dp_mst_port_downstream_of_branch()
5140 	list_for_each_entry(vcpi, &state->vcpis, next) {  in drm_dp_mst_atomic_check_mstb_bw_limit()
5141 		if (!vcpi->pbn ||  in drm_dp_mst_atomic_check_mstb_bw_limit()
5142 		    !drm_dp_mst_port_downstream_of_branch(vcpi->port, mstb))  in drm_dp_mst_atomic_check_mstb_bw_limit()
5151 	if (mstb->port_parent)  in drm_dp_mst_atomic_check_mstb_bw_limit()
5152 		drm_dbg_atomic(mstb->mgr->dev,  in drm_dp_mst_atomic_check_mstb_bw_limit()
5154 			       mstb->port_parent->parent, mstb->port_parent, mstb);  in drm_dp_mst_atomic_check_mstb_bw_limit()
5156 		drm_dbg_atomic(mstb->mgr->dev, "[MSTB:%p] Checking bandwidth limits\n", mstb);  in drm_dp_mst_atomic_check_mstb_bw_limit()
5158 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_atomic_check_mstb_bw_limit()
5176 	if (port->pdt == DP_PEER_DEVICE_NONE)  in drm_dp_mst_atomic_check_port_bw_limit()
5179 	if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_mst_atomic_check_port_bw_limit()
5182 		list_for_each_entry(vcpi, &state->vcpis, next) {  in drm_dp_mst_atomic_check_port_bw_limit()
5183 			if (vcpi->port != port)  in drm_dp_mst_atomic_check_port_bw_limit()
5185 			if (!vcpi->pbn)  in drm_dp_mst_atomic_check_port_bw_limit()
5198 		if (!port->full_pbn) {  in drm_dp_mst_atomic_check_port_bw_limit()
5199 			drm_dbg_atomic(port->mgr->dev,  in drm_dp_mst_atomic_check_port_bw_limit()
5201 				       port->parent, port);  in drm_dp_mst_atomic_check_port_bw_limit()
5202 			return -EINVAL;  in drm_dp_mst_atomic_check_port_bw_limit()
5205 		pbn_used = vcpi->pbn;  in drm_dp_mst_atomic_check_port_bw_limit()
5207 		pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb,  in drm_dp_mst_atomic_check_port_bw_limit()
5213 	if (pbn_used > port->full_pbn) {  in drm_dp_mst_atomic_check_port_bw_limit()
5214 		drm_dbg_atomic(port->mgr->dev,  in drm_dp_mst_atomic_check_port_bw_limit()
5216 			       port->parent, port, pbn_used, port->full_pbn);  in drm_dp_mst_atomic_check_port_bw_limit()
5217 		return -ENOSPC;  in drm_dp_mst_atomic_check_port_bw_limit()
5220 	drm_dbg_atomic(port->mgr->dev, "[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n",  in drm_dp_mst_atomic_check_port_bw_limit()
5221 		       port->parent, port, pbn_used, port->full_pbn);  in drm_dp_mst_atomic_check_port_bw_limit()
5233 	list_for_each_entry(vcpi, &mst_state->vcpis, next) {  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5234 		/* Releasing VCPI is always OK-even if the port is gone */  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5235 		if (!vcpi->vcpi) {  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5236 			drm_dbg_atomic(mgr->dev, "[MST PORT:%p] releases all VCPI slots\n",  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5237 				       vcpi->port);  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5241 		drm_dbg_atomic(mgr->dev, "[MST PORT:%p] requires %d vcpi slots\n",  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5242 			       vcpi->port, vcpi->vcpi);  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5244 		avail_slots -= vcpi->vcpi;  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5246 			drm_dbg_atomic(mgr->dev,  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5248 				       vcpi->port, mst_state, avail_slots + vcpi->vcpi);  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5249 			return -ENOSPC;  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5252 		if (++payload_count > mgr->max_payloads) {  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5253 			drm_dbg_atomic(mgr->dev,  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5255 				       mgr, mst_state, mgr->max_payloads);  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5256 			return -EINVAL;  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5259 	drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n",  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5260 		       mgr, mst_state, avail_slots, 63 - avail_slots);  in drm_dp_mst_atomic_check_vcpi_alloc_limit()
5268  * @mgr: MST topology manager
5270  * Whenever there is a change in mst topology
5273  * CRTCs in that topology
5290 		return -EINVAL;  in drm_dp_mst_add_affected_dsc_crtcs()
5292 	list_for_each_entry(pos, &mst_state->vcpis, next) {  in drm_dp_mst_add_affected_dsc_crtcs()
5294 		connector = pos->port->connector;  in drm_dp_mst_add_affected_dsc_crtcs()
5297 			return -EINVAL;  in drm_dp_mst_add_affected_dsc_crtcs()
5304 		crtc = conn_state->crtc;  in drm_dp_mst_add_affected_dsc_crtcs()
5309 		if (!drm_dp_mst_dsc_aux_for_port(pos->port))  in drm_dp_mst_add_affected_dsc_crtcs()
5312 		crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc);  in drm_dp_mst_add_affected_dsc_crtcs()
5317 		drm_dbg_atomic(mgr->dev, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n",  in drm_dp_mst_add_affected_dsc_crtcs()
5320 		crtc_state->mode_changed = true;  in drm_dp_mst_add_affected_dsc_crtcs()
5327  * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off
5350 	mst_state = drm_atomic_get_mst_topology_state(state, port->mgr);  in drm_dp_mst_atomic_enable_dsc()
5355 	list_for_each_entry(pos, &mst_state->vcpis, next) {  in drm_dp_mst_atomic_enable_dsc()
5356 		if (pos->port == port) {  in drm_dp_mst_atomic_enable_dsc()
5363 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5366 		return -EINVAL;  in drm_dp_mst_atomic_enable_dsc()
5369 	if (pos->dsc_enabled == enable) {  in drm_dp_mst_atomic_enable_dsc()
5370 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5372 			       port, enable, pos->vcpi);  in drm_dp_mst_atomic_enable_dsc()
5373 		vcpi = pos->vcpi;  in drm_dp_mst_atomic_enable_dsc()
5377 		vcpi = drm_dp_atomic_find_vcpi_slots(state, port->mgr, port, pbn, pbn_div);  in drm_dp_mst_atomic_enable_dsc()
5378 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5382 			return -EINVAL;  in drm_dp_mst_atomic_enable_dsc()
5385 	pos->dsc_enabled = enable;  in drm_dp_mst_atomic_enable_dsc()
5391  * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an
5395  * Checks the given topology state for an atomic update to ensure that it's
5418 		if (!mgr->mst_state)  in drm_dp_mst_atomic_check()
5425 		mutex_lock(&mgr->lock);  in drm_dp_mst_atomic_check()
5426 		ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary,  in drm_dp_mst_atomic_check()
5428 		mutex_unlock(&mgr->lock);  in drm_dp_mst_atomic_check()
5446  * drm_atomic_get_mst_topology_state: get MST topology state
5449  * @mgr: MST topology manager, also the private object in this case
5453  * topology object. Also, drm_atomic_get_private_obj_state() expects the caller
5458  * The MST topology state or error pointer.
5463 	return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));  in drm_atomic_get_mst_topology_state()
5468  * drm_dp_mst_topology_mgr_init - initialise a topology manager
5470  * @dev: device providing this structure - for i2c addition.
5488 	mutex_init(&mgr->lock);  in drm_dp_mst_topology_mgr_init()
5489 	mutex_init(&mgr->qlock);  in drm_dp_mst_topology_mgr_init()
5490 	mutex_init(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_init()
5491 	mutex_init(&mgr->delayed_destroy_lock);  in drm_dp_mst_topology_mgr_init()
5492 	mutex_init(&mgr->up_req_lock);  in drm_dp_mst_topology_mgr_init()
5493 	mutex_init(&mgr->probe_lock);  in drm_dp_mst_topology_mgr_init()
5495 	mutex_init(&mgr->topology_ref_history_lock);  in drm_dp_mst_topology_mgr_init()
5497 	INIT_LIST_HEAD(&mgr->tx_msg_downq);  in drm_dp_mst_topology_mgr_init()
5498 	INIT_LIST_HEAD(&mgr->destroy_port_list);  in drm_dp_mst_topology_mgr_init()
5499 	INIT_LIST_HEAD(&mgr->destroy_branch_device_list);  in drm_dp_mst_topology_mgr_init()
5500 	INIT_LIST_HEAD(&mgr->up_req_list);  in drm_dp_mst_topology_mgr_init()
5504 	 * requeuing will be also flushed when deiniting the topology manager.  in drm_dp_mst_topology_mgr_init()
5506 	mgr->delayed_destroy_wq = alloc_ordered_workqueue("drm_dp_mst_wq", 0);  in drm_dp_mst_topology_mgr_init()
5507 	if (mgr->delayed_destroy_wq == NULL)  in drm_dp_mst_topology_mgr_init()
5508 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5510 	INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);  in drm_dp_mst_topology_mgr_init()
5511 	INIT_WORK(&mgr->tx_work, drm_dp_tx_work);  in drm_dp_mst_topology_mgr_init()
5512 	INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work);  in drm_dp_mst_topology_mgr_init()
5513 	INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work);  in drm_dp_mst_topology_mgr_init()
5514 	init_waitqueue_head(&mgr->tx_waitq);  in drm_dp_mst_topology_mgr_init()
5515 	mgr->dev = dev;  in drm_dp_mst_topology_mgr_init()
5516 	mgr->aux = aux;  in drm_dp_mst_topology_mgr_init()
5517 	mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;  in drm_dp_mst_topology_mgr_init()
5518 	mgr->max_payloads = max_payloads;  in drm_dp_mst_topology_mgr_init()
5519 	mgr->max_lane_count = max_lane_count;  in drm_dp_mst_topology_mgr_init()
5520 	mgr->max_link_rate = max_link_rate;  in drm_dp_mst_topology_mgr_init()
5521 	mgr->conn_base_id = conn_base_id;  in drm_dp_mst_topology_mgr_init()
5522 	if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||  in drm_dp_mst_topology_mgr_init()
5523 	    max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)  in drm_dp_mst_topology_mgr_init()
5524 		return -EINVAL;  in drm_dp_mst_topology_mgr_init()
5525 	mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);  in drm_dp_mst_topology_mgr_init()
5526 	if (!mgr->payloads)  in drm_dp_mst_topology_mgr_init()
5527 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5528 	mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);  in drm_dp_mst_topology_mgr_init()
5529 	if (!mgr->proposed_vcpis)  in drm_dp_mst_topology_mgr_init()
5530 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5531 	set_bit(0, &mgr->payload_mask);  in drm_dp_mst_topology_mgr_init()
5535 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5537 	mst_state->mgr = mgr;  in drm_dp_mst_topology_mgr_init()
5538 	INIT_LIST_HEAD(&mst_state->vcpis);  in drm_dp_mst_topology_mgr_init()
5540 	drm_atomic_private_obj_init(dev, &mgr->base,  in drm_dp_mst_topology_mgr_init()
5541 				    &mst_state->base,  in drm_dp_mst_topology_mgr_init()
5549  * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
5555 	flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_destroy()
5557 	if (mgr->delayed_destroy_wq) {  in drm_dp_mst_topology_mgr_destroy()
5558 		destroy_workqueue(mgr->delayed_destroy_wq);  in drm_dp_mst_topology_mgr_destroy()
5559 		mgr->delayed_destroy_wq = NULL;  in drm_dp_mst_topology_mgr_destroy()
5561 	mutex_lock(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_destroy()
5562 	kfree(mgr->payloads);  in drm_dp_mst_topology_mgr_destroy()
5563 	mgr->payloads = NULL;  in drm_dp_mst_topology_mgr_destroy()
5564 	kfree(mgr->proposed_vcpis);  in drm_dp_mst_topology_mgr_destroy()
5565 	mgr->proposed_vcpis = NULL;  in drm_dp_mst_topology_mgr_destroy()
5566 	mutex_unlock(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_destroy()
5567 	mgr->dev = NULL;  in drm_dp_mst_topology_mgr_destroy()
5568 	mgr->aux = NULL;  in drm_dp_mst_topology_mgr_destroy()
5569 	drm_atomic_private_obj_fini(&mgr->base);  in drm_dp_mst_topology_mgr_destroy()
5570 	mgr->funcs = NULL;  in drm_dp_mst_topology_mgr_destroy()
5572 	mutex_destroy(&mgr->delayed_destroy_lock);  in drm_dp_mst_topology_mgr_destroy()
5573 	mutex_destroy(&mgr->payload_lock);  in drm_dp_mst_topology_mgr_destroy()
5574 	mutex_destroy(&mgr->qlock);  in drm_dp_mst_topology_mgr_destroy()
5575 	mutex_destroy(&mgr->lock);  in drm_dp_mst_topology_mgr_destroy()
5576 	mutex_destroy(&mgr->up_req_lock);  in drm_dp_mst_topology_mgr_destroy()
5577 	mutex_destroy(&mgr->probe_lock);  in drm_dp_mst_topology_mgr_destroy()
5579 	mutex_destroy(&mgr->topology_ref_history_lock);  in drm_dp_mst_topology_mgr_destroy()
5588 	if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)  in remote_i2c_read_ok()
5591 	for (i = 0; i < num - 1; i++) {  in remote_i2c_read_ok()
5597 	return msgs[num - 1].flags & I2C_M_RD &&  in remote_i2c_read_ok()
5598 		msgs[num - 1].len <= 0xff;  in remote_i2c_read_ok()
5605 	for (i = 0; i < num - 1; i++) {  in remote_i2c_write_ok()
5611 	return !(msgs[num - 1].flags & I2C_M_RD) && msgs[num - 1].len <= 0xff;  in remote_i2c_write_ok()
5618 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_read()
5626 	msg.u.i2c_read.num_transactions = num - 1;  in drm_dp_mst_i2c_read()
5627 	msg.u.i2c_read.port_number = port->port_num;  in drm_dp_mst_i2c_read()
5628 	for (i = 0; i < num - 1; i++) {  in drm_dp_mst_i2c_read()
5634 	msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;  in drm_dp_mst_i2c_read()
5635 	msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;  in drm_dp_mst_i2c_read()
5639 		ret = -ENOMEM;  in drm_dp_mst_i2c_read()
5643 	txmsg->dst = mstb;  in drm_dp_mst_i2c_read()
5651 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_i2c_read()
5652 			ret = -EREMOTEIO;  in drm_dp_mst_i2c_read()
5655 		if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {  in drm_dp_mst_i2c_read()
5656 			ret = -EIO;  in drm_dp_mst_i2c_read()
5659 		memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);  in drm_dp_mst_i2c_read()
5671 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_write()
5679 		ret = -ENOMEM;  in drm_dp_mst_i2c_write()
5685 		msg.u.i2c_write.port_number = port->port_num;  in drm_dp_mst_i2c_write()
5691 		txmsg->dst = mstb;  in drm_dp_mst_i2c_write()
5698 			if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_i2c_write()
5699 				ret = -EREMOTEIO;  in drm_dp_mst_i2c_write()
5712 /* I2C device */
5716 	struct drm_dp_aux *aux = adapter->algo_data;  in drm_dp_mst_i2c_xfer()
5720 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_xfer()
5723 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_mst_i2c_xfer()
5725 		return -EREMOTEIO;  in drm_dp_mst_i2c_xfer()
5732 		drm_dbg_kms(mgr->dev, "Unsupported I2C transaction for MST device\n");  in drm_dp_mst_i2c_xfer()
5733 		ret = -EIO;  in drm_dp_mst_i2c_xfer()
5754  * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
5755  * @port: The port to add the I2C bus on
5761 	struct drm_dp_aux *aux = &port->aux;  in drm_dp_mst_register_i2c_bus()
5762 	struct device *parent_dev = port->mgr->dev->dev;  in drm_dp_mst_register_i2c_bus()
5764 	aux->ddc.algo = &drm_dp_mst_i2c_algo;  in drm_dp_mst_register_i2c_bus()
5765 	aux->ddc.algo_data = aux;  in drm_dp_mst_register_i2c_bus()
5766 	aux->ddc.retries = 3;  in drm_dp_mst_register_i2c_bus()
5768 	aux->ddc.class = I2C_CLASS_DDC;  in drm_dp_mst_register_i2c_bus()
5769 	aux->ddc.owner = THIS_MODULE;  in drm_dp_mst_register_i2c_bus()
5771 	aux->ddc.dev.parent = parent_dev;  in drm_dp_mst_register_i2c_bus()
5772 	aux->ddc.dev.of_node = parent_dev->of_node;  in drm_dp_mst_register_i2c_bus()
5774 	strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev),  in drm_dp_mst_register_i2c_bus()
5775 		sizeof(aux->ddc.name));  in drm_dp_mst_register_i2c_bus()
5777 	return i2c_add_adapter(&aux->ddc);  in drm_dp_mst_register_i2c_bus()
5781  * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
5782  * @port: The port to remove the I2C bus from
5786 	i2c_del_adapter(&port->aux.ddc);  in drm_dp_mst_unregister_i2c_bus()
5790  * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device
5793  * A single physical MST hub object can be represented in the topology
5800  * May acquire mgr->lock
5809 	if (!port || port->dpcd_rev < DP_DPCD_REV_14)  in drm_dp_mst_is_virtual_dpcd()
5813 	if (port->port_num >= 8)  in drm_dp_mst_is_virtual_dpcd()
5816 	/* DP-to-HDMI Protocol Converter */  in drm_dp_mst_is_virtual_dpcd()
5817 	if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV &&  in drm_dp_mst_is_virtual_dpcd()
5818 	    !port->mcs &&  in drm_dp_mst_is_virtual_dpcd()
5819 	    port->ldps)  in drm_dp_mst_is_virtual_dpcd()
5822 	/* DP-to-DP */  in drm_dp_mst_is_virtual_dpcd()
5823 	mutex_lock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
5824 	if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&  in drm_dp_mst_is_virtual_dpcd()
5825 	    port->mstb &&  in drm_dp_mst_is_virtual_dpcd()
5826 	    port->mstb->num_ports == 2) {  in drm_dp_mst_is_virtual_dpcd()
5827 		list_for_each_entry(downstream_port, &port->mstb->ports, next) {  in drm_dp_mst_is_virtual_dpcd()
5828 			if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK &&  in drm_dp_mst_is_virtual_dpcd()
5829 			    !downstream_port->input) {  in drm_dp_mst_is_virtual_dpcd()
5830 				mutex_unlock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
5835 	mutex_unlock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
5841  * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC
5867 	if (port->parent->port_parent)  in drm_dp_mst_dsc_aux_for_port()
5868 		immediate_upstream_port = port->parent->port_parent;  in drm_dp_mst_dsc_aux_for_port()
5879 		    !fec_port->fec_capable)  in drm_dp_mst_dsc_aux_for_port()
5882 		fec_port = fec_port->parent->port_parent;  in drm_dp_mst_dsc_aux_for_port()
5885 	/* DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
5889 		if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
5892 		if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
5895 		if (drm_dp_dpcd_read(&immediate_upstream_port->aux,  in drm_dp_mst_dsc_aux_for_port()
5899 		/* Enpoint decompression with DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
5903 			return &port->aux;  in drm_dp_mst_dsc_aux_for_port()
5905 		/* Virtual DPCD decompression with DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
5906 		return &immediate_upstream_port->aux;  in drm_dp_mst_dsc_aux_for_port()
5909 	/* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */  in drm_dp_mst_dsc_aux_for_port()
5911 		return &port->aux;  in drm_dp_mst_dsc_aux_for_port()
5916 	 * - Physical aux has Synaptics OUI  in drm_dp_mst_dsc_aux_for_port()
5917 	 * - DPv1.4 or higher  in drm_dp_mst_dsc_aux_for_port()
5918 	 * - Port is on primary branch device  in drm_dp_mst_dsc_aux_for_port()
5919 	 * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG)  in drm_dp_mst_dsc_aux_for_port()
5921 	if (drm_dp_read_desc(port->mgr->aux, &desc, true))  in drm_dp_mst_dsc_aux_for_port()
5925 	    port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 &&  in drm_dp_mst_dsc_aux_for_port()
5926 	    port->parent == port->mgr->mst_primary) {  in drm_dp_mst_dsc_aux_for_port()
5929 		if (drm_dp_read_dpcd_caps(port->mgr->aux, dpcd_ext) < 0)  in drm_dp_mst_dsc_aux_for_port()
5935 			return port->mgr->aux;  in drm_dp_mst_dsc_aux_for_port()
5940 	 * connected to the GPU is capable of DSC -  in drm_dp_mst_dsc_aux_for_port()
5944 	if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
5947 	if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
5952 		return &port->aux;  in drm_dp_mst_dsc_aux_for_port()