26 #include <linux/i2c.h>
57  * protocol. The helpers contain a topology manager and bandwidth manager.
207 		number_of_bits--;  in drm_dp_msg_header_crc4()
211 		bitshift--;  in drm_dp_msg_header_crc4()
223 		number_of_bits--;  in drm_dp_msg_header_crc4()
241 		number_of_bits--;  in drm_dp_msg_data_crc4()
245 		bitshift--;  in drm_dp_msg_data_crc4()
257 		number_of_bits--;  in drm_dp_msg_data_crc4()
269 	size += (hdr->lct / 2);  in drm_dp_calc_sb_hdr_size()
280 	buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);  in drm_dp_encode_sideband_msg_hdr()
281 	for (i = 0; i < (hdr->lct / 2); i++)  in drm_dp_encode_sideband_msg_hdr()
282 		buf[idx++] = hdr->rad[i];  in drm_dp_encode_sideband_msg_hdr()
283 	buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |  in drm_dp_encode_sideband_msg_hdr()
284 		(hdr->msg_len & 0x3f);  in drm_dp_encode_sideband_msg_hdr()
285 	buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);  in drm_dp_encode_sideband_msg_hdr()
287 	crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);  in drm_dp_encode_sideband_msg_hdr()
288 	buf[idx - 1] |= (crc4 & 0xf);  in drm_dp_encode_sideband_msg_hdr()
308 	crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);  in drm_dp_decode_sideband_msg_hdr()
310 	if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {  in drm_dp_decode_sideband_msg_hdr()
311 		drm_dbg_kms(mgr->dev, "crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);  in drm_dp_decode_sideband_msg_hdr()
315 	hdr->lct = (buf[0] & 0xf0) >> 4;  in drm_dp_decode_sideband_msg_hdr()
316 	hdr->lcr = (buf[0] & 0xf);  in drm_dp_decode_sideband_msg_hdr()
318 	for (i = 0; i < (hdr->lct / 2); i++)  in drm_dp_decode_sideband_msg_hdr()
319 		hdr->rad[i] = buf[idx++];  in drm_dp_decode_sideband_msg_hdr()
320 	hdr->broadcast = (buf[idx] >> 7) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
321 	hdr->path_msg = (buf[idx] >> 6) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
322 	hdr->msg_len = buf[idx] & 0x3f;  in drm_dp_decode_sideband_msg_hdr()
324 	hdr->somt = (buf[idx] >> 7) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
325 	hdr->eomt = (buf[idx] >> 6) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
326 	hdr->seqno = (buf[idx] >> 4) & 0x1;  in drm_dp_decode_sideband_msg_hdr()
338 	u8 *buf = raw->msg;  in drm_dp_encode_sideband_req()
340 	buf[idx++] = req->req_type & 0x7f;  in drm_dp_encode_sideband_req()
342 	switch (req->req_type) {  in drm_dp_encode_sideband_req()
346 		buf[idx] = (req->u.port_num.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
350 		buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |  in drm_dp_encode_sideband_req()
351 			(req->u.allocate_payload.number_sdp_streams & 0xf);  in drm_dp_encode_sideband_req()
353 		buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);  in drm_dp_encode_sideband_req()
355 		buf[idx] = (req->u.allocate_payload.pbn >> 8);  in drm_dp_encode_sideband_req()
357 		buf[idx] = (req->u.allocate_payload.pbn & 0xff);  in drm_dp_encode_sideband_req()
359 		for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {  in drm_dp_encode_sideband_req()
360 			buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |  in drm_dp_encode_sideband_req()
361 				(req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);  in drm_dp_encode_sideband_req()
364 		if (req->u.allocate_payload.number_sdp_streams & 1) {  in drm_dp_encode_sideband_req()
365 			i = req->u.allocate_payload.number_sdp_streams - 1;  in drm_dp_encode_sideband_req()
366 			buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;  in drm_dp_encode_sideband_req()
371 		buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
373 		buf[idx] = (req->u.query_payload.vcpi & 0x7f);  in drm_dp_encode_sideband_req()
377 		buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
378 		buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;  in drm_dp_encode_sideband_req()
380 		buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;  in drm_dp_encode_sideband_req()
382 		buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);  in drm_dp_encode_sideband_req()
384 		buf[idx] = (req->u.dpcd_read.num_bytes);  in drm_dp_encode_sideband_req()
389 		buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
390 		buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;  in drm_dp_encode_sideband_req()
392 		buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;  in drm_dp_encode_sideband_req()
394 		buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);  in drm_dp_encode_sideband_req()
396 		buf[idx] = (req->u.dpcd_write.num_bytes);  in drm_dp_encode_sideband_req()
398 		memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);  in drm_dp_encode_sideband_req()
399 		idx += req->u.dpcd_write.num_bytes;  in drm_dp_encode_sideband_req()
402 		buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
403 		buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);  in drm_dp_encode_sideband_req()
405 		for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {  in drm_dp_encode_sideband_req()
406 			buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;  in drm_dp_encode_sideband_req()
408 			buf[idx] = req->u.i2c_read.transactions[i].num_bytes;  in drm_dp_encode_sideband_req()
410 …memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes…  in drm_dp_encode_sideband_req()
411 			idx += req->u.i2c_read.transactions[i].num_bytes;  in drm_dp_encode_sideband_req()
413 			buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4;  in drm_dp_encode_sideband_req()
414 			buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);  in drm_dp_encode_sideband_req()
417 		buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;  in drm_dp_encode_sideband_req()
419 		buf[idx] = (req->u.i2c_read.num_bytes_read);  in drm_dp_encode_sideband_req()
424 		buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;  in drm_dp_encode_sideband_req()
426 		buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;  in drm_dp_encode_sideband_req()
428 		buf[idx] = (req->u.i2c_write.num_bytes);  in drm_dp_encode_sideband_req()
430 		memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);  in drm_dp_encode_sideband_req()
431 		idx += req->u.i2c_write.num_bytes;  in drm_dp_encode_sideband_req()
436 		msg = &req->u.enc_status;  in drm_dp_encode_sideband_req()
437 		buf[idx] = msg->stream_id;  in drm_dp_encode_sideband_req()
439 		memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id));  in drm_dp_encode_sideband_req()
440 		idx += sizeof(msg->client_id);  in drm_dp_encode_sideband_req()
442 		buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event);  in drm_dp_encode_sideband_req()
443 		buf[idx] |= msg->valid_stream_event ? BIT(2) : 0;  in drm_dp_encode_sideband_req()
444 		buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior);  in drm_dp_encode_sideband_req()
445 		buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0;  in drm_dp_encode_sideband_req()
450 	raw->cur_len = idx;  in drm_dp_encode_sideband_req()
459 	const u8 *buf = raw->msg;  in drm_dp_decode_sideband_req()
462 	req->req_type = buf[idx++] & 0x7f;  in drm_dp_decode_sideband_req()
463 	switch (req->req_type) {  in drm_dp_decode_sideband_req()
467 		req->u.port_num.port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
472 				&req->u.allocate_payload;  in drm_dp_decode_sideband_req()
474 			a->number_sdp_streams = buf[idx] & 0xf;  in drm_dp_decode_sideband_req()
475 			a->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
478 			a->vcpi = buf[idx] & 0x7f;  in drm_dp_decode_sideband_req()
480 			a->pbn = buf[++idx] << 8;  in drm_dp_decode_sideband_req()
481 			a->pbn |= buf[++idx];  in drm_dp_decode_sideband_req()
484 			for (i = 0; i < a->number_sdp_streams; i++) {  in drm_dp_decode_sideband_req()
485 				a->sdp_stream_sink[i] =  in drm_dp_decode_sideband_req()
491 		req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
493 		req->u.query_payload.vcpi = buf[idx] & 0x7f;  in drm_dp_decode_sideband_req()
497 			struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read;  in drm_dp_decode_sideband_req()
499 			r->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
501 			r->dpcd_address = (buf[idx] << 16) & 0xf0000;  in drm_dp_decode_sideband_req()
502 			r->dpcd_address |= (buf[++idx] << 8) & 0xff00;  in drm_dp_decode_sideband_req()
503 			r->dpcd_address |= buf[++idx] & 0xff;  in drm_dp_decode_sideband_req()
505 			r->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
511 				&req->u.dpcd_write;  in drm_dp_decode_sideband_req()
513 			w->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
515 			w->dpcd_address = (buf[idx] << 16) & 0xf0000;  in drm_dp_decode_sideband_req()
516 			w->dpcd_address |= (buf[++idx] << 8) & 0xff00;  in drm_dp_decode_sideband_req()
517 			w->dpcd_address |= buf[++idx] & 0xff;  in drm_dp_decode_sideband_req()
519 			w->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
521 			w->bytes = kmemdup(&buf[++idx], w->num_bytes,  in drm_dp_decode_sideband_req()
523 			if (!w->bytes)  in drm_dp_decode_sideband_req()
524 				return -ENOMEM;  in drm_dp_decode_sideband_req()
529 			struct drm_dp_remote_i2c_read *r = &req->u.i2c_read;  in drm_dp_decode_sideband_req()
533 			r->num_transactions = buf[idx] & 0x3;  in drm_dp_decode_sideband_req()
534 			r->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
535 			for (i = 0; i < r->num_transactions; i++) {  in drm_dp_decode_sideband_req()
536 				tx = &r->transactions[i];  in drm_dp_decode_sideband_req()
538 				tx->i2c_dev_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
539 				tx->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
540 				tx->bytes = kmemdup(&buf[++idx],  in drm_dp_decode_sideband_req()
541 						    tx->num_bytes,  in drm_dp_decode_sideband_req()
543 				if (!tx->bytes) {  in drm_dp_decode_sideband_req()
547 				idx += tx->num_bytes;  in drm_dp_decode_sideband_req()
548 				tx->no_stop_bit = (buf[idx] >> 5) & 0x1;  in drm_dp_decode_sideband_req()
549 				tx->i2c_transaction_delay = buf[idx] & 0xf;  in drm_dp_decode_sideband_req()
553 				for (i = 0; i < r->num_transactions; i++) {  in drm_dp_decode_sideband_req()
554 					tx = &r->transactions[i];  in drm_dp_decode_sideband_req()
555 					kfree(tx->bytes);  in drm_dp_decode_sideband_req()
557 				return -ENOMEM;  in drm_dp_decode_sideband_req()
560 			r->read_i2c_device_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
561 			r->num_bytes_read = buf[++idx];  in drm_dp_decode_sideband_req()
566 			struct drm_dp_remote_i2c_write *w = &req->u.i2c_write;  in drm_dp_decode_sideband_req()
568 			w->port_number = (buf[idx] >> 4) & 0xf;  in drm_dp_decode_sideband_req()
569 			w->write_i2c_device_id = buf[++idx] & 0x7f;  in drm_dp_decode_sideband_req()
570 			w->num_bytes = buf[++idx];  in drm_dp_decode_sideband_req()
571 			w->bytes = kmemdup(&buf[++idx], w->num_bytes,  in drm_dp_decode_sideband_req()
573 			if (!w->bytes)  in drm_dp_decode_sideband_req()
574 				return -ENOMEM;  in drm_dp_decode_sideband_req()
578 		req->u.enc_status.stream_id = buf[idx++];  in drm_dp_decode_sideband_req()
579 		for (i = 0; i < sizeof(req->u.enc_status.client_id); i++)  in drm_dp_decode_sideband_req()
580 			req->u.enc_status.client_id[i] = buf[idx++];  in drm_dp_decode_sideband_req()
582 		req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0),  in drm_dp_decode_sideband_req()
584 		req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2),  in drm_dp_decode_sideband_req()
586 		req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3),  in drm_dp_decode_sideband_req()
588 		req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5),  in drm_dp_decode_sideband_req()
604 	if (req->req_type == DP_LINK_ADDRESS) {  in drm_dp_dump_sideband_msg_req_body()
606 		P("type=%s\n", drm_dp_mst_req_type_str(req->req_type));  in drm_dp_dump_sideband_msg_req_body()
610 	P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type));  in drm_dp_dump_sideband_msg_req_body()
613 	switch (req->req_type) {  in drm_dp_dump_sideband_msg_req_body()
617 		P("port=%d\n", req->u.port_num.port_number);  in drm_dp_dump_sideband_msg_req_body()
621 		  req->u.allocate_payload.port_number,  in drm_dp_dump_sideband_msg_req_body()
622 		  req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn,  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.number_sdp_streams,  in drm_dp_dump_sideband_msg_req_body()
625 		  req->u.allocate_payload.sdp_stream_sink);  in drm_dp_dump_sideband_msg_req_body()
629 		  req->u.query_payload.port_number,  in drm_dp_dump_sideband_msg_req_body()
630 		  req->u.query_payload.vcpi);  in drm_dp_dump_sideband_msg_req_body()
634 		  req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address,  in drm_dp_dump_sideband_msg_req_body()
635 		  req->u.dpcd_read.num_bytes);  in drm_dp_dump_sideband_msg_req_body()
639 		  req->u.dpcd_write.port_number,  in drm_dp_dump_sideband_msg_req_body()
640 		  req->u.dpcd_write.dpcd_address,  in drm_dp_dump_sideband_msg_req_body()
641 		  req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes,  in drm_dp_dump_sideband_msg_req_body()
642 		  req->u.dpcd_write.bytes);  in drm_dp_dump_sideband_msg_req_body()
646 		  req->u.i2c_read.port_number,  in drm_dp_dump_sideband_msg_req_body()
647 		  req->u.i2c_read.num_transactions,  in drm_dp_dump_sideband_msg_req_body()
648 		  req->u.i2c_read.read_i2c_device_id,  in drm_dp_dump_sideband_msg_req_body()
649 		  req->u.i2c_read.num_bytes_read);  in drm_dp_dump_sideband_msg_req_body()
652 		for (i = 0; i < req->u.i2c_read.num_transactions; i++) {  in drm_dp_dump_sideband_msg_req_body()
654 				&req->u.i2c_read.transactions[i];  in drm_dp_dump_sideband_msg_req_body()
657 			  i, rtx->i2c_dev_id, rtx->num_bytes,  in drm_dp_dump_sideband_msg_req_body()
658 			  rtx->no_stop_bit, rtx->i2c_transaction_delay,  in drm_dp_dump_sideband_msg_req_body()
659 			  rtx->num_bytes, rtx->bytes);  in drm_dp_dump_sideband_msg_req_body()
664 		  req->u.i2c_write.port_number,  in drm_dp_dump_sideband_msg_req_body()
665 		  req->u.i2c_write.write_i2c_device_id,  in drm_dp_dump_sideband_msg_req_body()
666 		  req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes,  in drm_dp_dump_sideband_msg_req_body()
667 		  req->u.i2c_write.bytes);  in drm_dp_dump_sideband_msg_req_body()
672 		  req->u.enc_status.stream_id,  in drm_dp_dump_sideband_msg_req_body()
673 		  (int)ARRAY_SIZE(req->u.enc_status.client_id),  in drm_dp_dump_sideband_msg_req_body()
674 		  req->u.enc_status.client_id, req->u.enc_status.stream_event,  in drm_dp_dump_sideband_msg_req_body()
675 		  req->u.enc_status.valid_stream_event,  in drm_dp_dump_sideband_msg_req_body()
676 		  req->u.enc_status.stream_behavior,  in drm_dp_dump_sideband_msg_req_body()
677 		  req->u.enc_status.valid_stream_behavior);  in drm_dp_dump_sideband_msg_req_body()
696 	drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf,  in drm_dp_mst_dump_sideband_msg_tx()
699 		   txmsg->cur_offset, txmsg->cur_len, txmsg->seqno,  in drm_dp_mst_dump_sideband_msg_tx()
700 		   drm_dp_mst_sideband_tx_state_str(txmsg->state),  in drm_dp_mst_dump_sideband_msg_tx()
701 		   txmsg->path_msg, buf);  in drm_dp_mst_dump_sideband_msg_tx()
736 	u8 *buf = raw->msg;  in drm_dp_encode_sideband_reply()
738 	buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);  in drm_dp_encode_sideband_reply()
740 	raw->cur_len = idx;  in drm_dp_encode_sideband_reply()
748 	 * ignore out-of-order messages or messages that are part of a  in drm_dp_sideband_msg_set_header()
751 	if (!hdr->somt && !msg->have_somt)  in drm_dp_sideband_msg_set_header()
755 	msg->curchunk_idx = 0;  in drm_dp_sideband_msg_set_header()
756 	msg->curchunk_len = hdr->msg_len;  in drm_dp_sideband_msg_set_header()
757 	msg->curchunk_hdrlen = hdrlen;  in drm_dp_sideband_msg_set_header()
759 	/* we have already gotten an somt - don't bother parsing */  in drm_dp_sideband_msg_set_header()
760 	if (hdr->somt && msg->have_somt)  in drm_dp_sideband_msg_set_header()
763 	if (hdr->somt) {  in drm_dp_sideband_msg_set_header()
764 		memcpy(&msg->initial_hdr, hdr,  in drm_dp_sideband_msg_set_header()
766 		msg->have_somt = true;  in drm_dp_sideband_msg_set_header()
768 	if (hdr->eomt)  in drm_dp_sideband_msg_set_header()
769 		msg->have_eomt = true;  in drm_dp_sideband_msg_set_header()
780 	memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);  in drm_dp_sideband_append_payload()
781 	msg->curchunk_idx += replybuflen;  in drm_dp_sideband_append_payload()
783 	if (msg->curchunk_idx >= msg->curchunk_len) {  in drm_dp_sideband_append_payload()
785 		crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);  in drm_dp_sideband_append_payload()
786 		if (crc4 != msg->chunk[msg->curchunk_len - 1])  in drm_dp_sideband_append_payload()
789 				       msg->chunk,  msg->curchunk_len, false);  in drm_dp_sideband_append_payload()
791 		memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);  in drm_dp_sideband_append_payload()
792 		msg->curlen += msg->curchunk_len - 1;  in drm_dp_sideband_append_payload()
804 	memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_link_address()
806 	repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_link_address()
808 	if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
810 	for (i = 0; i < repmsg->u.link_addr.nports; i++) {  in drm_dp_sideband_parse_link_address()
811 		if (raw->msg[idx] & 0x80)  in drm_dp_sideband_parse_link_address()
812 			repmsg->u.link_addr.ports[i].input_port = 1;  in drm_dp_sideband_parse_link_address()
814 		repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;  in drm_dp_sideband_parse_link_address()
815 		repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_link_address()
818 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
820 		repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;  in drm_dp_sideband_parse_link_address()
821 		repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;  in drm_dp_sideband_parse_link_address()
822 		if (repmsg->u.link_addr.ports[i].input_port == 0)  in drm_dp_sideband_parse_link_address()
823 			repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;  in drm_dp_sideband_parse_link_address()
825 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
827 		if (repmsg->u.link_addr.ports[i].input_port == 0) {  in drm_dp_sideband_parse_link_address()
828 			repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);  in drm_dp_sideband_parse_link_address()
830 			if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
832 			memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_link_address()
834 			if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
836 			repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_link_address()
837 			repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_link_address()
841 		if (idx > raw->curlen)  in drm_dp_sideband_parse_link_address()
847 	DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_link_address()
856 	repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_remote_dpcd_read()
858 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_read()
860 	repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];  in drm_dp_sideband_parse_remote_dpcd_read()
862 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_read()
865 …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()
868 	DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_dpcd_read()
877 	repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;  in drm_dp_sideband_parse_remote_dpcd_write()
879 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_dpcd_write()
883 	DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_dpcd_write()
892 	repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);  in drm_dp_sideband_parse_remote_i2c_read_ack()
894 	if (idx > raw->curlen)  in drm_dp_sideband_parse_remote_i2c_read_ack()
896 	repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];  in drm_dp_sideband_parse_remote_i2c_read_ack()
899 …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()
902 	DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_remote_i2c_read_ack()
911 	repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_enum_path_resources_ack()
912 	repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1;  in drm_dp_sideband_parse_enum_path_resources_ack()
914 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
916 	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()
918 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
920 	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()
922 	if (idx > raw->curlen)  in drm_dp_sideband_parse_enum_path_resources_ack()
926 	DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_enum_path_resources_ack()
935 	repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_allocate_payload_ack()
937 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
939 	repmsg->u.allocate_payload.vcpi = raw->msg[idx];  in drm_dp_sideband_parse_allocate_payload_ack()
941 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
943 	repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);  in drm_dp_sideband_parse_allocate_payload_ack()
945 	if (idx > raw->curlen)  in drm_dp_sideband_parse_allocate_payload_ack()
949 	DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_allocate_payload_ack()
958 	repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_query_payload_ack()
960 	if (idx > raw->curlen)  in drm_dp_sideband_parse_query_payload_ack()
962 	repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);  in drm_dp_sideband_parse_query_payload_ack()
964 	if (idx > raw->curlen)  in drm_dp_sideband_parse_query_payload_ack()
968 	DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);  in drm_dp_sideband_parse_query_payload_ack()
977 	repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf;  in drm_dp_sideband_parse_power_updown_phy_ack()
979 	if (idx > raw->curlen) {  in drm_dp_sideband_parse_power_updown_phy_ack()
981 			      idx, raw->curlen);  in drm_dp_sideband_parse_power_updown_phy_ack()
994 	reply = &repmsg->u.enc_status;  in drm_dp_sideband_parse_query_stream_enc_status()
996 	reply->stream_id = raw->msg[3];  in drm_dp_sideband_parse_query_stream_enc_status()
998 	reply->reply_signed = raw->msg[2] & BIT(0);  in drm_dp_sideband_parse_query_stream_enc_status()
1008 	reply->hdcp_1x_device_present = raw->msg[2] & BIT(4);  in drm_dp_sideband_parse_query_stream_enc_status()
1009 	reply->hdcp_2x_device_present = raw->msg[2] & BIT(3);  in drm_dp_sideband_parse_query_stream_enc_status()
1011 	reply->query_capable_device_present = raw->msg[2] & BIT(5);  in drm_dp_sideband_parse_query_stream_enc_status()
1012 	reply->legacy_device_present = raw->msg[2] & BIT(6);  in drm_dp_sideband_parse_query_stream_enc_status()
1013 	reply->unauthorizable_device_present = raw->msg[2] & BIT(7);  in drm_dp_sideband_parse_query_stream_enc_status()
1015 	reply->auth_completed = !!(raw->msg[1] & BIT(3));  in drm_dp_sideband_parse_query_stream_enc_status()
1016 	reply->encryption_enabled = !!(raw->msg[1] & BIT(4));  in drm_dp_sideband_parse_query_stream_enc_status()
1017 	reply->repeater_present = !!(raw->msg[1] & BIT(5));  in drm_dp_sideband_parse_query_stream_enc_status()
1018 	reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6;  in drm_dp_sideband_parse_query_stream_enc_status()
1028 	msg->reply_type = (raw->msg[0] & 0x80) >> 7;  in drm_dp_sideband_parse_reply()
1029 	msg->req_type = (raw->msg[0] & 0x7f);  in drm_dp_sideband_parse_reply()
1031 	if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_sideband_parse_reply()
1032 		memcpy(msg->u.nak.guid, &raw->msg[1], 16);  in drm_dp_sideband_parse_reply()
1033 		msg->u.nak.reason = raw->msg[17];  in drm_dp_sideband_parse_reply()
1034 		msg->u.nak.nak_data = raw->msg[18];  in drm_dp_sideband_parse_reply()
1038 	switch (msg->req_type) {  in drm_dp_sideband_parse_reply()
1063 		drm_err(mgr->dev, "Got unknown reply 0x%02x (%s)\n",  in drm_dp_sideband_parse_reply()
1064 			msg->req_type, drm_dp_mst_req_type_str(msg->req_type));  in drm_dp_sideband_parse_reply()
1076 	msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;  in drm_dp_sideband_parse_connection_status_notify()
1078 	if (idx > raw->curlen)  in drm_dp_sideband_parse_connection_status_notify()
1081 	memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_connection_status_notify()
1083 	if (idx > raw->curlen)  in drm_dp_sideband_parse_connection_status_notify()
1086 	msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1087 	msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1088 	msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1089 	msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;  in drm_dp_sideband_parse_connection_status_notify()
1090 	msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);  in drm_dp_sideband_parse_connection_status_notify()
1094 	drm_dbg_kms(mgr->dev, "connection status reply parse length fail %d %d\n",  in drm_dp_sideband_parse_connection_status_notify()
1095 		    idx, raw->curlen);  in drm_dp_sideband_parse_connection_status_notify()
1105 	msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;  in drm_dp_sideband_parse_resource_status_notify()
1107 	if (idx > raw->curlen)  in drm_dp_sideband_parse_resource_status_notify()
1110 	memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);  in drm_dp_sideband_parse_resource_status_notify()
1112 	if (idx > raw->curlen)  in drm_dp_sideband_parse_resource_status_notify()
1115 	msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);  in drm_dp_sideband_parse_resource_status_notify()
1119 	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()
1128 	msg->req_type = (raw->msg[0] & 0x7f);  in drm_dp_sideband_parse_req()
1130 	switch (msg->req_type) {  in drm_dp_sideband_parse_req()
1136 		drm_err(mgr->dev, "Got unknown request 0x%02x (%s)\n",  in drm_dp_sideband_parse_req()
1137 			msg->req_type, drm_dp_mst_req_type_str(msg->req_type));  in drm_dp_sideband_parse_req()
1169 	msg->path_msg = true;  in build_clear_payload_id_table()
1180 	msg->path_msg = true;  in build_enum_path_resources()
1201 	msg->path_msg = true;  in build_allocate_payload()
1216 	msg->path_msg = true;  in build_power_updown_phy()
1244 	 * All updates to txmsg->state are protected by mgr->qlock, and the two  in check_txmsg_state()
1248 	state = READ_ONCE(txmsg->state);  in check_txmsg_state()
1256 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_wait_tx_reply()
1264 		 * poll-waiting for the MST reply interrupt if we didn't receive  in drm_dp_mst_wait_tx_reply()
1268 		 * Club 3D CAC-1557 TypeC -> DP adapter which for some reason  in drm_dp_mst_wait_tx_reply()
1275 		ret = wait_event_timeout(mgr->tx_waitq,  in drm_dp_mst_wait_tx_reply()
1277 					 mgr->cbs->poll_hpd_irq ?  in drm_dp_mst_wait_tx_reply()
1281 		if (ret || !mgr->cbs->poll_hpd_irq ||  in drm_dp_mst_wait_tx_reply()
1285 		mgr->cbs->poll_hpd_irq(mgr);  in drm_dp_mst_wait_tx_reply()
1288 	mutex_lock(&mgr->qlock);  in drm_dp_mst_wait_tx_reply()
1290 		if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {  in drm_dp_mst_wait_tx_reply()
1291 			ret = -EIO;  in drm_dp_mst_wait_tx_reply()
1295 		drm_dbg_kms(mgr->dev, "timedout msg send %p %d %d\n",  in drm_dp_mst_wait_tx_reply()
1296 			    txmsg, txmsg->state, txmsg->seqno);  in drm_dp_mst_wait_tx_reply()
1299 		ret = -EIO;  in drm_dp_mst_wait_tx_reply()
1302 		if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||  in drm_dp_mst_wait_tx_reply()
1303 		    txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||  in drm_dp_mst_wait_tx_reply()
1304 		    txmsg->state == DRM_DP_SIDEBAND_TX_SENT)  in drm_dp_mst_wait_tx_reply()
1305 			list_del(&txmsg->next);  in drm_dp_mst_wait_tx_reply()
1308 	if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) {  in drm_dp_mst_wait_tx_reply()
1313 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_wait_tx_reply()
1327 	mstb->lct = lct;  in drm_dp_add_mst_branch_device()
1329 		memcpy(mstb->rad, rad, lct / 2);  in drm_dp_add_mst_branch_device()
1330 	INIT_LIST_HEAD(&mstb->ports);  in drm_dp_add_mst_branch_device()
1331 	kref_init(&mstb->topology_kref);  in drm_dp_add_mst_branch_device()
1332 	kref_init(&mstb->malloc_kref);  in drm_dp_add_mst_branch_device()
1341 	if (mstb->port_parent)  in drm_dp_free_mst_branch_device()
1342 		drm_dp_mst_put_port_malloc(mstb->port_parent);  in drm_dp_free_mst_branch_device()
1350  * Topology refcount overview
1355  * two different kinds of refcounts: topology refcounts, and malloc refcounts.
1357  * Topology refcounts are not exposed to drivers, and are handled internally
1359  * in-memory topology state from being changed in the middle of critical
1362  * of the topology until its topology refcount reaches zero. Additionally,
1370  * drm_dp_mst_branch allocated even after all of its topology references have
1372  * branch's last known state before it was disconnected from the topology.
1380  * helpers. Exposing this API to drivers in a race-free manner would take more
1384  * Refcount relationships in a topology
1387  * Let's take a look at why the relationship between topology and malloc
1390  * .. kernel-figure:: dp-mst/topology-figure-1.dot
1392  *    An example of topology and malloc refs in a DP MST topology with two
1393  *    active payloads. Topology refcount increments are indicated by solid
1399  * As you can see in the above figure, every branch increments the topology
1406  * topology would start to look like the figure below.
1408  * .. kernel-figure:: dp-mst/topology-figure-2.dot
1413  * Whenever a port or branch device's topology refcount reaches zero, it will
1414  * decrement the topology refcounts of all its children, the malloc refcount
1416  * #4, this means they both have been disconnected from the topology and freed
1418  * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port
1426  * connected to the topology. In this case, we would travel up the topology as
1429  * .. kernel-figure:: dp-mst/topology-figure-3.dot
1436  * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch
1449 	kref_get(&mstb->malloc_kref);  in drm_dp_mst_get_mstb_malloc()
1450 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref));  in drm_dp_mst_get_mstb_malloc()
1454  * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch
1467 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1);  in drm_dp_mst_put_mstb_malloc()
1468 	kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device);  in drm_dp_mst_put_mstb_malloc()
1476 	drm_dp_mst_put_mstb_malloc(port->parent);  in drm_dp_free_mst_port()
1481  * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port
1500 	kref_get(&port->malloc_kref);  in drm_dp_mst_get_port_malloc()
1501 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref));  in drm_dp_mst_get_port_malloc()
1506  * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port
1518 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1);  in drm_dp_mst_put_port_malloc()
1519 	kref_put(&port->malloc_kref, drm_dp_free_mst_port);  in drm_dp_mst_put_port_malloc()
1544 	for (i = 0; i < history->len; i++) {  in __topology_ref_save()
1545 		if (history->entries[i].backtrace == backtrace) {  in __topology_ref_save()
1546 			entry = &history->entries[i];  in __topology_ref_save()
1554 		int new_len = history->len + 1;  in __topology_ref_save()
1556 		new = krealloc(history->entries, sizeof(*new) * new_len,  in __topology_ref_save()
1561 		entry = &new[history->len];  in __topology_ref_save()
1562 		history->len = new_len;  in __topology_ref_save()
1563 		history->entries = new;  in __topology_ref_save()
1565 		entry->backtrace = backtrace;  in __topology_ref_save()
1566 		entry->type = type;  in __topology_ref_save()
1567 		entry->count = 0;  in __topology_ref_save()
1569 	entry->count++;  in __topology_ref_save()
1570 	entry->ts_nsec = ktime_get_ns();  in __topology_ref_save()
1578 	if (entry_a->ts_nsec > entry_b->ts_nsec)  in topology_ref_history_cmp()
1580 	else if (entry_a->ts_nsec < entry_b->ts_nsec)  in topology_ref_history_cmp()
1581 		return -1;  in topology_ref_history_cmp()
1606 	if (!history->len)  in __dump_topology_ref_history()
1612 	sort(history->entries, history->len, sizeof(*history->entries),  in __dump_topology_ref_history()
1615 	drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n",  in __dump_topology_ref_history()
1618 	for (i = 0; i < history->len; i++) {  in __dump_topology_ref_history()
1620 			&history->entries[i];  in __dump_topology_ref_history()
1621 		u64 ts_nsec = entry->ts_nsec;  in __dump_topology_ref_history()
1624 		stack_depot_snprint(entry->backtrace, buf, PAGE_SIZE, 4);  in __dump_topology_ref_history()
1627 			   entry->count,  in __dump_topology_ref_history()
1628 			   topology_ref_type_to_str(entry->type),  in __dump_topology_ref_history()
1633 	kfree(history->entries);  in __dump_topology_ref_history()
1641 	__dump_topology_ref_history(&mstb->topology_ref_history, mstb,  in drm_dp_mst_dump_mstb_topology_history()
1648 	__dump_topology_ref_history(&port->topology_ref_history, port,  in drm_dp_mst_dump_port_topology_history()
1656 	__topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type);  in save_mstb_topology_ref()
1663 	__topology_ref_save(port->mgr, &port->topology_ref_history, type);  in save_port_topology_ref()
1669 	mutex_lock(&mgr->topology_ref_history_lock);  in topology_ref_history_lock()
1675 	mutex_unlock(&mgr->topology_ref_history_lock);  in topology_ref_history_unlock()
1696 	list_for_each_entry(payload, &state->payloads, next)  in drm_atomic_get_mst_payload_state()
1697 		if (payload->port == port)  in drm_atomic_get_mst_payload_state()
1708 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_destroy_mst_branch_device()
1712 	INIT_LIST_HEAD(&mstb->destroy_next);  in drm_dp_destroy_mst_branch_device()
1715 	 * This can get called under mgr->mutex, so we need to perform the  in drm_dp_destroy_mst_branch_device()
1718 	mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_mst_branch_device()
1719 	list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list);  in drm_dp_destroy_mst_branch_device()
1720 	mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_mst_branch_device()
1721 	queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);  in drm_dp_destroy_mst_branch_device()
1725  * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a
1727  * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of
1729  * Attempts to grab a topology reference to @mstb, if it hasn't yet been
1730  * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has
1731  * reached 0). Holding a topology reference implies that a malloc reference
1732  * will be held to @mstb as long as the user holds the topology reference.
1735  * reference to @mstb. If you already have a topology reference to @mstb, you
1743  * * 1: A topology reference was grabbed successfully
1744  * * 0: @port is no longer in the topology, no reference was grabbed
1751 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_try_get_mstb()
1752 	ret = kref_get_unless_zero(&mstb->topology_kref);  in drm_dp_mst_topology_try_get_mstb()
1754 		drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));  in drm_dp_mst_topology_try_get_mstb()
1758 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_try_get_mstb()
1764  * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a
1766  * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of
1770  * you are already guaranteed to have at least one active topology reference
1779 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_get_mstb()
1782 	WARN_ON(kref_read(&mstb->topology_kref) == 0);  in drm_dp_mst_topology_get_mstb()
1783 	kref_get(&mstb->topology_kref);  in drm_dp_mst_topology_get_mstb()
1784 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));  in drm_dp_mst_topology_get_mstb()
1786 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_get_mstb()
1790  * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch
1792  * @mstb: The &struct drm_dp_mst_branch to release the topology reference from
1794  * Releases a topology reference from @mstb by decrementing
1804 	topology_ref_history_lock(mstb->mgr);  in drm_dp_mst_topology_put_mstb()
1806 	drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref) - 1);  in drm_dp_mst_topology_put_mstb()
1809 	topology_ref_history_unlock(mstb->mgr);  in drm_dp_mst_topology_put_mstb()
1810 	kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device);  in drm_dp_mst_topology_put_mstb()
1817 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_destroy_port()
1822 	if (port->input) {  in drm_dp_destroy_port()
1827 	drm_edid_free(port->cached_edid);  in drm_dp_destroy_port()
1833 	mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_port()
1834 	list_add(&port->next, &mgr->destroy_port_list);  in drm_dp_destroy_port()
1835 	mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_destroy_port()
1836 	queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);  in drm_dp_destroy_port()
1840  * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a
1842  * @port: &struct drm_dp_mst_port to increment the topology refcount of
1844  * Attempts to grab a topology reference to @port, if it hasn't yet been
1845  * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached
1846  * 0). Holding a topology reference implies that a malloc reference will be
1847  * held to @port as long as the user holds the topology reference.
1850  * reference to @port. If you already have a topology reference to @port, you
1858  * * 1: A topology reference was grabbed successfully
1859  * * 0: @port is no longer in the topology, no reference was grabbed
1866 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_try_get_port()
1867 	ret = kref_get_unless_zero(&port->topology_kref);  in drm_dp_mst_topology_try_get_port()
1869 		drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));  in drm_dp_mst_topology_try_get_port()
1873 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_try_get_port()
1878  * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port
1879  * @port: The &struct drm_dp_mst_port to increment the topology refcount of
1883  * you are already guaranteed to have at least one active topology reference
1892 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_get_port()
1894 	WARN_ON(kref_read(&port->topology_kref) == 0);  in drm_dp_mst_topology_get_port()
1895 	kref_get(&port->topology_kref);  in drm_dp_mst_topology_get_port()
1896 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));  in drm_dp_mst_topology_get_port()
1899 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_get_port()
1903  * drm_dp_mst_topology_put_port() - release a topology reference to a port
1904  * @port: The &struct drm_dp_mst_port to release the topology reference from
1906  * Releases a topology reference from @port by decrementing
1915 	topology_ref_history_lock(port->mgr);  in drm_dp_mst_topology_put_port()
1917 	drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref) - 1);  in drm_dp_mst_topology_put_port()
1920 	topology_ref_history_unlock(port->mgr);  in drm_dp_mst_topology_put_port()
1921 	kref_put(&port->topology_kref, drm_dp_destroy_port);  in drm_dp_mst_topology_put_port()
1934 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_topology_get_mstb_validated_locked()
1935 		if (port->mstb) {  in drm_dp_mst_topology_get_mstb_validated_locked()
1937 			    port->mstb, to_find);  in drm_dp_mst_topology_get_mstb_validated_locked()
1951 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_get_mstb_validated()
1952 	if (mgr->mst_primary) {  in drm_dp_mst_topology_get_mstb_validated()
1954 		    mgr->mst_primary, mstb);  in drm_dp_mst_topology_get_mstb_validated()
1959 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_get_mstb_validated()
1969 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_topology_get_port_validated_locked()
1973 		if (port->mstb) {  in drm_dp_mst_topology_get_port_validated_locked()
1975 			    port->mstb, to_find);  in drm_dp_mst_topology_get_port_validated_locked()
1989 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_get_port_validated()
1990 	if (mgr->mst_primary) {  in drm_dp_mst_topology_get_port_validated()
1992 		    mgr->mst_primary, port);  in drm_dp_mst_topology_get_port_validated()
1997 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_get_port_validated()
2006 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_get_port()
2007 		if (port->port_num == port_num) {  in drm_dp_get_port()
2024 	int parent_lct = port->parent->lct;  in drm_dp_calculate_rad()
2026 	int idx = (parent_lct - 1) / 2;  in drm_dp_calculate_rad()
2029 		memcpy(rad, port->parent->rad, idx + 1);  in drm_dp_calculate_rad()
2034 	rad[idx] |= port->port_num << shift;  in drm_dp_calculate_rad()
2058 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_port_set_pdt()
2063 	if (port->pdt == new_pdt && port->mcs == new_mcs)  in drm_dp_port_set_pdt()
2067 	if (port->pdt != DP_PEER_DEVICE_NONE) {  in drm_dp_port_set_pdt()
2068 		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_port_set_pdt()
2070 			 * If the new PDT would also have an i2c bus,  in drm_dp_port_set_pdt()
2075 				port->pdt = new_pdt;  in drm_dp_port_set_pdt()
2076 				port->mcs = new_mcs;  in drm_dp_port_set_pdt()
2080 			/* remove i2c over sideband */  in drm_dp_port_set_pdt()
2083 			mutex_lock(&mgr->lock);  in drm_dp_port_set_pdt()
2084 			drm_dp_mst_topology_put_mstb(port->mstb);  in drm_dp_port_set_pdt()
2085 			port->mstb = NULL;  in drm_dp_port_set_pdt()
2086 			mutex_unlock(&mgr->lock);  in drm_dp_port_set_pdt()
2090 	port->pdt = new_pdt;  in drm_dp_port_set_pdt()
2091 	port->mcs = new_mcs;  in drm_dp_port_set_pdt()
2093 	if (port->pdt != DP_PEER_DEVICE_NONE) {  in drm_dp_port_set_pdt()
2094 		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_port_set_pdt()
2095 			/* add i2c over sideband */  in drm_dp_port_set_pdt()
2101 				ret = -ENOMEM;  in drm_dp_port_set_pdt()
2102 				drm_err(mgr->dev, "Failed to create MSTB for port %p", port);  in drm_dp_port_set_pdt()
2106 			mutex_lock(&mgr->lock);  in drm_dp_port_set_pdt()
2107 			port->mstb = mstb;  in drm_dp_port_set_pdt()
2108 			mstb->mgr = port->mgr;  in drm_dp_port_set_pdt()
2109 			mstb->port_parent = port;  in drm_dp_port_set_pdt()
2116 			mutex_unlock(&mgr->lock);  in drm_dp_port_set_pdt()
2125 		port->pdt = DP_PEER_DEVICE_NONE;  in drm_dp_port_set_pdt()
2130  * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband
2148 	return drm_dp_send_dpcd_read(port->mgr, port,  in drm_dp_mst_dpcd_read()
2153  * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband
2171 	return drm_dp_send_dpcd_write(port->mgr, port,  in drm_dp_mst_dpcd_write()
2179 	memcpy(mstb->guid, guid, 16);  in drm_dp_check_mstb_guid()
2181 	if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {  in drm_dp_check_mstb_guid()
2182 		if (mstb->port_parent) {  in drm_dp_check_mstb_guid()
2183 			ret = drm_dp_send_dpcd_write(mstb->mgr,  in drm_dp_check_mstb_guid()
2184 						     mstb->port_parent,  in drm_dp_check_mstb_guid()
2185 						     DP_GUID, 16, mstb->guid);  in drm_dp_check_mstb_guid()
2187 			ret = drm_dp_dpcd_write(mstb->mgr->aux,  in drm_dp_check_mstb_guid()
2188 						DP_GUID, mstb->guid, 16);  in drm_dp_check_mstb_guid()
2193 		return -EPROTO;  in drm_dp_check_mstb_guid()
2206 	snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);  in build_mst_prop_path()
2207 	for (i = 0; i < (mstb->lct - 1); i++) {  in build_mst_prop_path()
2209 		int port_num = (mstb->rad[i / 2] >> shift) & 0xf;  in build_mst_prop_path()
2211 		snprintf(temp, sizeof(temp), "-%d", port_num);  in build_mst_prop_path()
2214 	snprintf(temp, sizeof(temp), "-%d", pnum);  in build_mst_prop_path()
2219  * drm_dp_mst_connector_late_register() - Late MST connector registration
2232 	drm_dbg_kms(port->mgr->dev, "registering %s remote bus for %s\n",  in drm_dp_mst_connector_late_register()
2233 		    port->aux.name, connector->kdev->kobj.name);  in drm_dp_mst_connector_late_register()
2235 	port->aux.dev = connector->kdev;  in drm_dp_mst_connector_late_register()
2236 	return drm_dp_aux_register_devnode(&port->aux);  in drm_dp_mst_connector_late_register()
2241  * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration
2252 	drm_dbg_kms(port->mgr->dev, "unregistering %s remote bus for %s\n",  in drm_dp_mst_connector_early_unregister()
2253 		    port->aux.name, connector->kdev->kobj.name);  in drm_dp_mst_connector_early_unregister()
2254 	drm_dp_aux_unregister_devnode(&port->aux);  in drm_dp_mst_connector_early_unregister()
2262 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_port_add_connector()
2266 	build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));  in drm_dp_mst_port_add_connector()
2267 	port->connector = mgr->cbs->add_connector(mgr, port, proppath);  in drm_dp_mst_port_add_connector()
2268 	if (!port->connector) {  in drm_dp_mst_port_add_connector()
2269 		ret = -ENOMEM;  in drm_dp_mst_port_add_connector()
2273 	if (port->pdt != DP_PEER_DEVICE_NONE &&  in drm_dp_mst_port_add_connector()
2274 	    drm_dp_mst_is_end_device(port->pdt, port->mcs) &&  in drm_dp_mst_port_add_connector()
2275 	    port->port_num >= DP_MST_LOGICAL_PORT_0)  in drm_dp_mst_port_add_connector()
2276 		port->cached_edid = drm_edid_read_ddc(port->connector,  in drm_dp_mst_port_add_connector()
2277 						      &port->aux.ddc);  in drm_dp_mst_port_add_connector()
2279 	drm_connector_register(port->connector);  in drm_dp_mst_port_add_connector()
2283 	drm_err(mgr->dev, "Failed to create connector for port %p: %d\n", port, ret);  in drm_dp_mst_port_add_connector()
2287  * Drop a topology reference, and unlink the port from the in-memory topology
2294 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_unlink_port()
2295 	port->parent->num_ports--;  in drm_dp_mst_topology_unlink_port()
2296 	list_del(&port->next);  in drm_dp_mst_topology_unlink_port()
2297 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_unlink_port()
2311 	kref_init(&port->topology_kref);  in drm_dp_mst_add_port()
2312 	kref_init(&port->malloc_kref);  in drm_dp_mst_add_port()
2313 	port->parent = mstb;  in drm_dp_mst_add_port()
2314 	port->port_num = port_number;  in drm_dp_mst_add_port()
2315 	port->mgr = mgr;  in drm_dp_mst_add_port()
2316 	port->aux.name = "DPMST";  in drm_dp_mst_add_port()
2317 	port->aux.dev = dev->dev;  in drm_dp_mst_add_port()
2318 	port->aux.is_remote = true;  in drm_dp_mst_add_port()
2321 	port->aux.drm_dev = dev;  in drm_dp_mst_add_port()
2322 	drm_dp_remote_aux_init(&port->aux);  in drm_dp_mst_add_port()
2338 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_handle_link_address_port()
2345 	port = drm_dp_get_port(mstb, port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2348 					   port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2350 			return -ENOMEM;  in drm_dp_mst_handle_link_address_port()
2353 	} else if (!port->input && port_msg->input_port && port->connector) {  in drm_dp_mst_handle_link_address_port()
2354 		/* Since port->connector can't be changed here, we create a  in drm_dp_mst_handle_link_address_port()
2360 					   port_msg->port_number);  in drm_dp_mst_handle_link_address_port()
2362 			return -ENOMEM;  in drm_dp_mst_handle_link_address_port()
2365 	} else if (port->input && !port_msg->input_port) {  in drm_dp_mst_handle_link_address_port()
2367 	} else if (port->connector) {  in drm_dp_mst_handle_link_address_port()
2371 		drm_modeset_lock(&mgr->base.lock, NULL);  in drm_dp_mst_handle_link_address_port()
2373 		old_ddps = port->ddps;  in drm_dp_mst_handle_link_address_port()
2374 		changed = port->ddps != port_msg->ddps ||  in drm_dp_mst_handle_link_address_port()
2375 			(port->ddps &&  in drm_dp_mst_handle_link_address_port()
2376 			 (port->ldps != port_msg->legacy_device_plug_status ||  in drm_dp_mst_handle_link_address_port()
2377 			  port->dpcd_rev != port_msg->dpcd_revision ||  in drm_dp_mst_handle_link_address_port()
2378 			  port->mcs != port_msg->mcs ||  in drm_dp_mst_handle_link_address_port()
2379 			  port->pdt != port_msg->peer_device_type ||  in drm_dp_mst_handle_link_address_port()
2380 			  port->num_sdp_stream_sinks !=  in drm_dp_mst_handle_link_address_port()
2381 			  port_msg->num_sdp_stream_sinks));  in drm_dp_mst_handle_link_address_port()
2384 	port->input = port_msg->input_port;  in drm_dp_mst_handle_link_address_port()
2385 	if (!port->input)  in drm_dp_mst_handle_link_address_port()
2386 		new_pdt = port_msg->peer_device_type;  in drm_dp_mst_handle_link_address_port()
2387 	new_mcs = port_msg->mcs;  in drm_dp_mst_handle_link_address_port()
2388 	port->ddps = port_msg->ddps;  in drm_dp_mst_handle_link_address_port()
2389 	port->ldps = port_msg->legacy_device_plug_status;  in drm_dp_mst_handle_link_address_port()
2390 	port->dpcd_rev = port_msg->dpcd_revision;  in drm_dp_mst_handle_link_address_port()
2391 	port->num_sdp_streams = port_msg->num_sdp_streams;  in drm_dp_mst_handle_link_address_port()
2392 	port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;  in drm_dp_mst_handle_link_address_port()
2394 	/* manage mstb port lists with mgr lock - take a reference  in drm_dp_mst_handle_link_address_port()
2397 		mutex_lock(&mgr->lock);  in drm_dp_mst_handle_link_address_port()
2399 		list_add(&port->next, &mstb->ports);  in drm_dp_mst_handle_link_address_port()
2400 		mstb->num_ports++;  in drm_dp_mst_handle_link_address_port()
2401 		mutex_unlock(&mgr->lock);  in drm_dp_mst_handle_link_address_port()
2405 	 * Reprobe PBN caps on both hotplug, and when re-probing the link  in drm_dp_mst_handle_link_address_port()
2408 	if (old_ddps != port->ddps || !created) {  in drm_dp_mst_handle_link_address_port()
2409 		if (port->ddps && !port->input) {  in drm_dp_mst_handle_link_address_port()
2415 			port->full_pbn = 0;  in drm_dp_mst_handle_link_address_port()
2432 	if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&  in drm_dp_mst_handle_link_address_port()
2433 	    port->mcs)  in drm_dp_mst_handle_link_address_port()
2436 	if (port->connector)  in drm_dp_mst_handle_link_address_port()
2437 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_link_address_port()
2438 	else if (!port->input)  in drm_dp_mst_handle_link_address_port()
2441 	if (send_link_addr && port->mstb) {  in drm_dp_mst_handle_link_address_port()
2442 		ret = drm_dp_send_link_address(mgr, port->mstb);  in drm_dp_mst_handle_link_address_port()
2455 	if (port->connector)  in drm_dp_mst_handle_link_address_port()
2456 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_link_address_port()
2466 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_mst_handle_conn_stat()
2473 	port = drm_dp_get_port(mstb, conn_stat->port_number);  in drm_dp_mst_handle_conn_stat()
2477 	if (port->connector) {  in drm_dp_mst_handle_conn_stat()
2478 		if (!port->input && conn_stat->input_port) {  in drm_dp_mst_handle_conn_stat()
2485 			mstb->link_address_sent = false;  in drm_dp_mst_handle_conn_stat()
2491 		drm_modeset_lock(&mgr->base.lock, NULL);  in drm_dp_mst_handle_conn_stat()
2492 	} else if (port->input && !conn_stat->input_port) {  in drm_dp_mst_handle_conn_stat()
2495 		mstb->link_address_sent = false;  in drm_dp_mst_handle_conn_stat()
2499 	old_ddps = port->ddps;  in drm_dp_mst_handle_conn_stat()
2500 	port->input = conn_stat->input_port;  in drm_dp_mst_handle_conn_stat()
2501 	port->ldps = conn_stat->legacy_device_plug_status;  in drm_dp_mst_handle_conn_stat()
2502 	port->ddps = conn_stat->displayport_device_plug_status;  in drm_dp_mst_handle_conn_stat()
2504 	if (old_ddps != port->ddps) {  in drm_dp_mst_handle_conn_stat()
2505 		if (port->ddps && !port->input)  in drm_dp_mst_handle_conn_stat()
2508 			port->full_pbn = 0;  in drm_dp_mst_handle_conn_stat()
2511 	new_pdt = port->input ? DP_PEER_DEVICE_NONE : conn_stat->peer_device_type;  in drm_dp_mst_handle_conn_stat()
2512 	new_mcs = conn_stat->message_capability_status;  in drm_dp_mst_handle_conn_stat()
2517 		drm_err(mgr->dev, "Failed to change PDT for port %p: %d\n", port, ret);  in drm_dp_mst_handle_conn_stat()
2521 	if (port->connector)  in drm_dp_mst_handle_conn_stat()
2522 		drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_handle_conn_stat()
2539 	mutex_lock(&mgr->lock);  in drm_dp_get_mst_branch_device()
2540 	mstb = mgr->mst_primary;  in drm_dp_get_mst_branch_device()
2545 	for (i = 0; i < lct - 1; i++) {  in drm_dp_get_mst_branch_device()
2549 		list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_get_mst_branch_device()
2550 			if (port->port_num == port_num) {  in drm_dp_get_mst_branch_device()
2551 				mstb = port->mstb;  in drm_dp_get_mst_branch_device()
2553 					drm_err(mgr->dev,  in drm_dp_get_mst_branch_device()
2567 	mutex_unlock(&mgr->lock);  in drm_dp_get_mst_branch_device()
2581 	if (memcmp(mstb->guid, guid, 16) == 0)  in get_mst_branch_device_by_guid_helper()
2585 	list_for_each_entry(port, &mstb->ports, next) {  in get_mst_branch_device_by_guid_helper()
2586 		found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);  in get_mst_branch_device_by_guid_helper()
2603 	mutex_lock(&mgr->lock);  in drm_dp_get_mst_branch_device_by_guid()
2605 	mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);  in drm_dp_get_mst_branch_device_by_guid()
2612 	mutex_unlock(&mgr->lock);  in drm_dp_get_mst_branch_device_by_guid()
2623 	if (!mstb->link_address_sent) {  in drm_dp_check_and_send_link_address()
2631 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_check_and_send_link_address()
2632 		if (port->input || !port->ddps || !port->mstb)  in drm_dp_check_and_send_link_address()
2635 		ret = drm_dp_check_and_send_link_address(mgr, port->mstb);  in drm_dp_check_and_send_link_address()
2649 	struct drm_device *dev = mgr->dev;  in drm_dp_mst_link_probe_work()
2654 	mutex_lock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2656 	mutex_lock(&mgr->lock);  in drm_dp_mst_link_probe_work()
2657 	clear_payload_id_table = !mgr->payload_id_table_cleared;  in drm_dp_mst_link_probe_work()
2658 	mgr->payload_id_table_cleared = true;  in drm_dp_mst_link_probe_work()
2660 	mstb = mgr->mst_primary;  in drm_dp_mst_link_probe_work()
2666 	mutex_unlock(&mgr->lock);  in drm_dp_mst_link_probe_work()
2668 		mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2676 	 * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C  in drm_dp_mst_link_probe_work()
2688 	mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_link_probe_work()
2733 		tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);  in drm_dp_send_sideband_msg()
2735 		ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,  in drm_dp_send_sideband_msg()
2739 			if (ret == -EIO && retries < 5) {  in drm_dp_send_sideband_msg()
2743 			drm_dbg_kms(mgr->dev, "failed to dpcd write %d %d\n", tosend, ret);  in drm_dp_send_sideband_msg()
2745 			return -EIO;  in drm_dp_send_sideband_msg()
2748 		total -= tosend;  in drm_dp_send_sideband_msg()
2756 	struct drm_dp_mst_branch *mstb = txmsg->dst;  in set_hdr_from_dst_qlock()
2759 	req_type = txmsg->msg[0] & 0x7f;  in set_hdr_from_dst_qlock()
2763 		hdr->broadcast = 1;  in set_hdr_from_dst_qlock()
2765 		hdr->broadcast = 0;  in set_hdr_from_dst_qlock()
2766 	hdr->path_msg = txmsg->path_msg;  in set_hdr_from_dst_qlock()
2767 	if (hdr->broadcast) {  in set_hdr_from_dst_qlock()
2768 		hdr->lct = 1;  in set_hdr_from_dst_qlock()
2769 		hdr->lcr = 6;  in set_hdr_from_dst_qlock()
2771 		hdr->lct = mstb->lct;  in set_hdr_from_dst_qlock()
2772 		hdr->lcr = mstb->lct - 1;  in set_hdr_from_dst_qlock()
2775 	memcpy(hdr->rad, mstb->rad, hdr->lct / 2);  in set_hdr_from_dst_qlock()
2791 	if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT)  in process_single_tx_qlock()
2796 	if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED)  in process_single_tx_qlock()
2797 		txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;  in process_single_tx_qlock()
2805 	len = txmsg->cur_len - txmsg->cur_offset;  in process_single_tx_qlock()
2807 	/* 48 - sideband msg size - 1 byte for data CRC, x header bytes */  in process_single_tx_qlock()
2808 	space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);  in process_single_tx_qlock()
2811 	if (len == txmsg->cur_len)  in process_single_tx_qlock()
2819 	memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);  in process_single_tx_qlock()
2835 	txmsg->cur_offset += tosend;  in process_single_tx_qlock()
2836 	if (txmsg->cur_offset == txmsg->cur_len) {  in process_single_tx_qlock()
2837 		txmsg->state = DRM_DP_SIDEBAND_TX_SENT;  in process_single_tx_qlock()
2848 	WARN_ON(!mutex_is_locked(&mgr->qlock));  in process_single_down_tx_qlock()
2851 	if (list_empty(&mgr->tx_msg_downq))  in process_single_down_tx_qlock()
2854 	txmsg = list_first_entry(&mgr->tx_msg_downq,  in process_single_down_tx_qlock()
2858 		drm_dbg_kms(mgr->dev, "failed to send msg in q %d\n", ret);  in process_single_down_tx_qlock()
2859 		list_del(&txmsg->next);  in process_single_down_tx_qlock()
2860 		txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;  in process_single_down_tx_qlock()
2861 		wake_up_all(&mgr->tx_waitq);  in process_single_down_tx_qlock()
2868 	mutex_lock(&mgr->qlock);  in drm_dp_queue_down_tx()
2869 	list_add_tail(&txmsg->next, &mgr->tx_msg_downq);  in drm_dp_queue_down_tx()
2877 	if (list_is_singular(&mgr->tx_msg_downq))  in drm_dp_queue_down_tx()
2879 	mutex_unlock(&mgr->qlock);  in drm_dp_queue_down_tx()
2889 	for (i = 0; i < reply->nports; i++) {  in drm_dp_dump_link_address()
2890 		port_reply = &reply->ports[i];  in drm_dp_dump_link_address()
2891 		drm_dbg_kms(mgr->dev,  in drm_dp_dump_link_address()
2894 			    port_reply->input_port,  in drm_dp_dump_link_address()
2895 			    port_reply->peer_device_type,  in drm_dp_dump_link_address()
2896 			    port_reply->port_number,  in drm_dp_dump_link_address()
2897 			    port_reply->dpcd_revision,  in drm_dp_dump_link_address()
2898 			    port_reply->mcs,  in drm_dp_dump_link_address()
2899 			    port_reply->ddps,  in drm_dp_dump_link_address()
2900 			    port_reply->legacy_device_plug_status,  in drm_dp_dump_link_address()
2901 			    port_reply->num_sdp_streams,  in drm_dp_dump_link_address()
2902 			    port_reply->num_sdp_stream_sinks);  in drm_dp_dump_link_address()
2917 		return -ENOMEM;  in drm_dp_send_link_address()
2919 	txmsg->dst = mstb;  in drm_dp_send_link_address()
2922 	mstb->link_address_sent = true;  in drm_dp_send_link_address()
2928 		drm_err(mgr->dev, "Sending link address failed with %d\n", ret);  in drm_dp_send_link_address()
2931 	if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_link_address()
2932 		drm_err(mgr->dev, "link address NAK received\n");  in drm_dp_send_link_address()
2933 		ret = -EIO;  in drm_dp_send_link_address()
2937 	reply = &txmsg->reply.u.link_addr;  in drm_dp_send_link_address()
2938 	drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports);  in drm_dp_send_link_address()
2941 	ret = drm_dp_check_mstb_guid(mstb, reply->guid);  in drm_dp_send_link_address()
2945 		drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf));  in drm_dp_send_link_address()
2946 		drm_err(mgr->dev, "GUID check on %s failed: %d\n", buf, ret);  in drm_dp_send_link_address()
2950 	for (i = 0; i < reply->nports; i++) {  in drm_dp_send_link_address()
2951 		port_mask |= BIT(reply->ports[i].port_number);  in drm_dp_send_link_address()
2952 		ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev,  in drm_dp_send_link_address()
2953 							  &reply->ports[i]);  in drm_dp_send_link_address()
2960 	/* Prune any ports that are currently a part of mstb in our in-memory  in drm_dp_send_link_address()
2961 	 * topology, but were not seen in this link address. Usually this  in drm_dp_send_link_address()
2962 	 * means that they were removed while the topology was out of sync,  in drm_dp_send_link_address()
2965 	mutex_lock(&mgr->lock);  in drm_dp_send_link_address()
2966 	list_for_each_entry_safe(port, tmp, &mstb->ports, next) {  in drm_dp_send_link_address()
2967 		if (port_mask & BIT(port->port_num))  in drm_dp_send_link_address()
2970 		drm_dbg_kms(mgr->dev, "port %d was not in link address, removing\n",  in drm_dp_send_link_address()
2971 			    port->port_num);  in drm_dp_send_link_address()
2972 		list_del(&port->next);  in drm_dp_send_link_address()
2976 	mutex_unlock(&mgr->lock);  in drm_dp_send_link_address()
2980 		mstb->link_address_sent = false;  in drm_dp_send_link_address()
2996 	txmsg->dst = mstb;  in drm_dp_send_clear_payload_id_table()
3002 	if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_clear_payload_id_table()
3003 		drm_dbg_kms(mgr->dev, "clear payload table id nak received\n");  in drm_dp_send_clear_payload_id_table()
3019 		return -ENOMEM;  in drm_dp_send_enum_path_resources()
3021 	txmsg->dst = mstb;  in drm_dp_send_enum_path_resources()
3022 	build_enum_path_resources(txmsg, port->port_num);  in drm_dp_send_enum_path_resources()
3029 		path_res = &txmsg->reply.u.path_resources;  in drm_dp_send_enum_path_resources()
3031 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_enum_path_resources()
3032 			drm_dbg_kms(mgr->dev, "enum path resources nak received\n");  in drm_dp_send_enum_path_resources()
3034 			if (port->port_num != path_res->port_number)  in drm_dp_send_enum_path_resources()
3037 			drm_dbg_kms(mgr->dev, "enum path resources %d: %d %d\n",  in drm_dp_send_enum_path_resources()
3038 				    path_res->port_number,  in drm_dp_send_enum_path_resources()
3039 				    path_res->full_payload_bw_number,  in drm_dp_send_enum_path_resources()
3040 				    path_res->avail_payload_bw_number);  in drm_dp_send_enum_path_resources()
3046 			if (port->full_pbn != path_res->full_payload_bw_number ||  in drm_dp_send_enum_path_resources()
3047 			    port->fec_capable != path_res->fec_capable)  in drm_dp_send_enum_path_resources()
3050 			port->full_pbn = path_res->full_payload_bw_number;  in drm_dp_send_enum_path_resources()
3051 			port->fec_capable = path_res->fec_capable;  in drm_dp_send_enum_path_resources()
3061 	if (!mstb->port_parent)  in drm_dp_get_last_connected_port_to_mstb()
3064 	if (mstb->port_parent->mstb != mstb)  in drm_dp_get_last_connected_port_to_mstb()
3065 		return mstb->port_parent;  in drm_dp_get_last_connected_port_to_mstb()
3067 	return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);  in drm_dp_get_last_connected_port_to_mstb()
3071  * Searches upwards in the topology starting from mstb to try to find the
3073  * topology. This can be used in order to perform operations like releasing
3086 	mutex_lock(&mgr->lock);  in drm_dp_get_last_connected_port_and_mstb()
3087 	if (!mgr->mst_primary)  in drm_dp_get_last_connected_port_and_mstb()
3095 		if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) {  in drm_dp_get_last_connected_port_and_mstb()
3096 			rmstb = found_port->parent;  in drm_dp_get_last_connected_port_and_mstb()
3097 			*port_num = found_port->port_num;  in drm_dp_get_last_connected_port_and_mstb()
3100 			mstb = found_port->parent;  in drm_dp_get_last_connected_port_and_mstb()
3104 	mutex_unlock(&mgr->lock);  in drm_dp_get_last_connected_port_and_mstb()
3119 	port_num = port->port_num;  in drm_dp_payload_send_msg()
3120 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_payload_send_msg()
3123 							       port->parent,  in drm_dp_payload_send_msg()
3127 			return -EINVAL;  in drm_dp_payload_send_msg()
3132 		ret = -ENOMEM;  in drm_dp_payload_send_msg()
3136 	for (i = 0; i < port->num_sdp_streams; i++)  in drm_dp_payload_send_msg()
3139 	txmsg->dst = mstb;  in drm_dp_payload_send_msg()
3142 			       pbn, port->num_sdp_streams, sinks);  in drm_dp_payload_send_msg()
3149 	 * mstb could also be removed from the topology. In the future, this  in drm_dp_payload_send_msg()
3152 	 * timeout if the topology is still connected to the system.  in drm_dp_payload_send_msg()
3156 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_payload_send_msg()
3157 			ret = -EINVAL;  in drm_dp_payload_send_msg()
3175 		return -EINVAL;  in drm_dp_send_power_updown_phy()
3180 		return -ENOMEM;  in drm_dp_send_power_updown_phy()
3183 	txmsg->dst = port->parent;  in drm_dp_send_power_updown_phy()
3184 	build_power_updown_phy(txmsg, port->port_num, power_up);  in drm_dp_send_power_updown_phy()
3187 	ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);  in drm_dp_send_power_updown_phy()
3189 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_power_updown_phy()
3190 			ret = -EINVAL;  in drm_dp_send_power_updown_phy()
3213 		return -ENOMEM;  in drm_dp_send_query_stream_enc_status()
3217 		ret = -EINVAL;  in drm_dp_send_query_stream_enc_status()
3223 	drm_modeset_lock(&mgr->base.lock, NULL);  in drm_dp_send_query_stream_enc_status()
3224 	state = to_drm_dp_mst_topology_state(mgr->base.state);  in drm_dp_send_query_stream_enc_status()
3232 	txmsg->dst = mgr->mst_primary;  in drm_dp_send_query_stream_enc_status()
3234 	build_query_stream_enc_status(txmsg, payload->vcpi, nonce);  in drm_dp_send_query_stream_enc_status()
3238 	ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg);  in drm_dp_send_query_stream_enc_status()
3241 	} else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_send_query_stream_enc_status()
3242 		drm_dbg_kms(mgr->dev, "query encryption status nak received\n");  in drm_dp_send_query_stream_enc_status()
3243 		ret = -ENXIO;  in drm_dp_send_query_stream_enc_status()
3248 	memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));  in drm_dp_send_query_stream_enc_status()
3251 	drm_modeset_unlock(&mgr->base.lock);  in drm_dp_send_query_stream_enc_status()
3262 	return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot,  in drm_dp_create_payload_at_dfp()
3263 					 payload->time_slots);  in drm_dp_create_payload_at_dfp()
3270 	struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);  in drm_dp_create_payload_to_remote()
3273 		return -EIO;  in drm_dp_create_payload_to_remote()
3275 	ret = drm_dp_payload_send_msg(mgr, port, payload->vcpi, payload->pbn);  in drm_dp_create_payload_to_remote()
3284 	drm_dbg_kms(mgr->dev, "\n");  in drm_dp_destroy_payload_at_remote_and_dfp()
3287 	if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE) {  in drm_dp_destroy_payload_at_remote_and_dfp()
3288 		drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0);  in drm_dp_destroy_payload_at_remote_and_dfp()
3289 		payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP;  in drm_dp_destroy_payload_at_remote_and_dfp()
3292 	if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_DFP)  in drm_dp_destroy_payload_at_remote_and_dfp()
3293 		drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0);  in drm_dp_destroy_payload_at_remote_and_dfp()
3297  * drm_dp_add_payload_part1() - Execute payload update part 1
3315 	if (mgr->payload_count == 0)  in drm_dp_add_payload_part1()
3316 		mgr->next_start_slot = mst_state->start_slot;  in drm_dp_add_payload_part1()
3318 	payload->vc_start_slot = mgr->next_start_slot;  in drm_dp_add_payload_part1()
3320 	mgr->payload_count++;  in drm_dp_add_payload_part1()
3321 	mgr->next_start_slot += payload->time_slots;  in drm_dp_add_payload_part1()
3323 	payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL;  in drm_dp_add_payload_part1()
3326 	port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);  in drm_dp_add_payload_part1()
3328 		drm_dbg_kms(mgr->dev,  in drm_dp_add_payload_part1()
3329 			    "VCPI %d for port %p not in topology, not creating a payload to remote\n",  in drm_dp_add_payload_part1()
3330 			    payload->vcpi, payload->port);  in drm_dp_add_payload_part1()
3331 		return -EIO;  in drm_dp_add_payload_part1()
3336 		drm_dbg_kms(mgr->dev, "Failed to create MST payload for port %p: %d\n",  in drm_dp_add_payload_part1()
3337 			    payload->port, ret);  in drm_dp_add_payload_part1()
3341 	payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP;  in drm_dp_add_payload_part1()
3351  * drm_dp_remove_payload_part1() - Remove an MST payload along the virtual channel
3367 	mutex_lock(&mgr->lock);  in drm_dp_remove_payload_part1()
3368 	send_remove = drm_dp_mst_port_downstream_of_branch(payload->port, mgr->mst_primary);  in drm_dp_remove_payload_part1()
3369 	mutex_unlock(&mgr->lock);  in drm_dp_remove_payload_part1()
3374 		drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n",  in drm_dp_remove_payload_part1()
3375 			    payload->vcpi);  in drm_dp_remove_payload_part1()
3377 	payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL;  in drm_dp_remove_payload_part1()
3382  * drm_dp_remove_payload_part2() - Remove an MST payload locally
3401 	list_for_each_entry(pos, &mst_state->payloads, next) {  in drm_dp_remove_payload_part2()
3402 		if (pos != new_payload && pos->vc_start_slot > new_payload->vc_start_slot)  in drm_dp_remove_payload_part2()
3403 			pos->vc_start_slot -= old_payload->time_slots;  in drm_dp_remove_payload_part2()
3405 	new_payload->vc_start_slot = -1;  in drm_dp_remove_payload_part2()
3407 	mgr->payload_count--;  in drm_dp_remove_payload_part2()
3408 	mgr->next_start_slot -= old_payload->time_slots;  in drm_dp_remove_payload_part2()
3410 	if (new_payload->delete)  in drm_dp_remove_payload_part2()
3411 		drm_dp_mst_put_port_malloc(new_payload->port);  in drm_dp_remove_payload_part2()
3413 	new_payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE;  in drm_dp_remove_payload_part2()
3417  * drm_dp_add_payload_part2() - Execute payload update part 2
3434 	if (payload->payload_allocation_status != DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) {  in drm_dp_add_payload_part2()
3435 		drm_dbg_kms(state->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",  in drm_dp_add_payload_part2()
3436 			    payload->port->connector->name);  in drm_dp_add_payload_part2()
3437 		return -EIO;  in drm_dp_add_payload_part2()
3443 		drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",  in drm_dp_add_payload_part2()
3444 			payload->port, ret);  in drm_dp_add_payload_part2()
3446 		payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE;  in drm_dp_add_payload_part2()
3460 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_send_dpcd_read()
3462 		return -EINVAL;  in drm_dp_send_dpcd_read()
3466 		ret = -ENOMEM;  in drm_dp_send_dpcd_read()
3470 	build_dpcd_read(txmsg, port->port_num, offset, size);  in drm_dp_send_dpcd_read()
3471 	txmsg->dst = port->parent;  in drm_dp_send_dpcd_read()
3479 	if (txmsg->reply.reply_type == 1) {  in drm_dp_send_dpcd_read()
3480 		drm_dbg_kms(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",  in drm_dp_send_dpcd_read()
3481 			    mstb, port->port_num, offset, size);  in drm_dp_send_dpcd_read()
3482 		ret = -EIO;  in drm_dp_send_dpcd_read()
3486 	if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) {  in drm_dp_send_dpcd_read()
3487 		ret = -EPROTO;  in drm_dp_send_dpcd_read()
3491 	ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes,  in drm_dp_send_dpcd_read()
3493 	memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret);  in drm_dp_send_dpcd_read()
3511 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_send_dpcd_write()
3513 		return -EINVAL;  in drm_dp_send_dpcd_write()
3517 		ret = -ENOMEM;  in drm_dp_send_dpcd_write()
3521 	build_dpcd_write(txmsg, port->port_num, offset, size, bytes);  in drm_dp_send_dpcd_write()
3522 	txmsg->dst = mstb;  in drm_dp_send_dpcd_write()
3528 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)  in drm_dp_send_dpcd_write()
3529 			ret = -EIO;  in drm_dp_send_dpcd_write()
3558 		return -ENOMEM;  in drm_dp_send_up_ack_reply()
3560 	txmsg->dst = mstb;  in drm_dp_send_up_ack_reply()
3563 	mutex_lock(&mgr->qlock);  in drm_dp_send_up_ack_reply()
3566 	mutex_unlock(&mgr->qlock);  in drm_dp_send_up_ack_reply()
3573  * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link
3593 		drm_dbg_kms(mgr->dev, "invalid link rate/lane count: (%d / %d)\n",  in drm_dp_get_vc_payload_bw()
3606  * drm_dp_read_mst_cap() - check whether or not a sink supports MST
3628  * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
3630  * @mst_state: true to enable MST on this connector - false to disable.
3640 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_set_mst()
3641 	if (mst_state == mgr->mst_state)  in drm_dp_mst_topology_mgr_set_mst()
3644 	mgr->mst_state = mst_state;  in drm_dp_mst_topology_mgr_set_mst()
3647 		WARN_ON(mgr->mst_primary);  in drm_dp_mst_topology_mgr_set_mst()
3650 		ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);  in drm_dp_mst_topology_mgr_set_mst()
3652 			drm_dbg_kms(mgr->dev, "%s: failed to read DPCD, ret %d\n",  in drm_dp_mst_topology_mgr_set_mst()
3653 				    mgr->aux->name, ret);  in drm_dp_mst_topology_mgr_set_mst()
3660 			ret = -ENOMEM;  in drm_dp_mst_topology_mgr_set_mst()
3663 		mstb->mgr = mgr;  in drm_dp_mst_topology_mgr_set_mst()
3666 		mgr->mst_primary = mstb;  in drm_dp_mst_topology_mgr_set_mst()
3667 		drm_dp_mst_topology_get_mstb(mgr->mst_primary);  in drm_dp_mst_topology_mgr_set_mst()
3669 		ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_set_mst()
3679 		queue_work(system_long_wq, &mgr->work);  in drm_dp_mst_topology_mgr_set_mst()
3684 		mstb = mgr->mst_primary;  in drm_dp_mst_topology_mgr_set_mst()
3685 		mgr->mst_primary = NULL;  in drm_dp_mst_topology_mgr_set_mst()
3687 		drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);  in drm_dp_mst_topology_mgr_set_mst()
3689 		mgr->payload_id_table_cleared = false;  in drm_dp_mst_topology_mgr_set_mst()
3691 		memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv));  in drm_dp_mst_topology_mgr_set_mst()
3692 		memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv));  in drm_dp_mst_topology_mgr_set_mst()
3696 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_set_mst()
3709 	/* The link address will need to be re-sent on resume */  in drm_dp_mst_topology_mgr_invalidate_mstb()
3710 	mstb->link_address_sent = false;  in drm_dp_mst_topology_mgr_invalidate_mstb()
3712 	list_for_each_entry(port, &mstb->ports, next)  in drm_dp_mst_topology_mgr_invalidate_mstb()
3713 		if (port->mstb)  in drm_dp_mst_topology_mgr_invalidate_mstb()
3714 			drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb);  in drm_dp_mst_topology_mgr_invalidate_mstb()
3718  * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
3726 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3727 	drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_suspend()
3729 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3730 	flush_work(&mgr->up_req_work);  in drm_dp_mst_topology_mgr_suspend()
3731 	flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_suspend()
3732 	flush_work(&mgr->delayed_destroy_work);  in drm_dp_mst_topology_mgr_suspend()
3734 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3735 	if (mgr->mst_state && mgr->mst_primary)  in drm_dp_mst_topology_mgr_suspend()
3736 		drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary);  in drm_dp_mst_topology_mgr_suspend()
3737 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_suspend()
3742  * drm_dp_mst_topology_mgr_resume() - resume the MST manager
3744  * @sync: whether or not to perform topology reprobing synchronously
3749  * If the device fails this returns -1, and the driver should do
3758  * Returns: -1 if the MST topology was removed while we were suspended, 0
3767 	mutex_lock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3768 	if (!mgr->mst_primary)  in drm_dp_mst_topology_mgr_resume()
3771 	if (drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd) < 0) {  in drm_dp_mst_topology_mgr_resume()
3772 		drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3776 	ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,  in drm_dp_mst_topology_mgr_resume()
3781 		drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3786 	ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);  in drm_dp_mst_topology_mgr_resume()
3788 		drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3792 	ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid);  in drm_dp_mst_topology_mgr_resume()
3794 		drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n");  in drm_dp_mst_topology_mgr_resume()
3799 	 * For the final step of resuming the topology, we need to bring the  in drm_dp_mst_topology_mgr_resume()
3800 	 * state of our in-memory topology back into sync with reality. So,  in drm_dp_mst_topology_mgr_resume()
3803 	queue_work(system_long_wq, &mgr->work);  in drm_dp_mst_topology_mgr_resume()
3804 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3807 		drm_dbg_kms(mgr->dev,  in drm_dp_mst_topology_mgr_resume()
3808 			    "Waiting for link probe work to finish re-syncing topology...\n");  in drm_dp_mst_topology_mgr_resume()
3809 		flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_resume()
3815 	mutex_unlock(&mgr->lock);  in drm_dp_mst_topology_mgr_resume()
3816 	return -1;  in drm_dp_mst_topology_mgr_resume()
3831 		up ? &mgr->up_req_recv : &mgr->down_rep_recv;  in drm_dp_get_one_sb_msg()
3838 	len = min(mgr->max_dpcd_transaction_bytes, 16);  in drm_dp_get_one_sb_msg()
3839 	ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len);  in drm_dp_get_one_sb_msg()
3841 		drm_dbg_kms(mgr->dev, "failed to read DPCD down rep %d %d\n", len, ret);  in drm_dp_get_one_sb_msg()
3849 		drm_dbg_kms(mgr->dev, "ERROR: failed header\n");  in drm_dp_get_one_sb_msg()
3857 			drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr.lct);  in drm_dp_get_one_sb_msg()
3863 		drm_dbg_kms(mgr->dev, "sideband msg set header failed %d\n", replyblock[0]);  in drm_dp_get_one_sb_msg()
3867 	replylen = min(msg->curchunk_len, (u8)(len - hdrlen));  in drm_dp_get_one_sb_msg()
3870 		drm_dbg_kms(mgr->dev, "sideband msg build failed %d\n", replyblock[0]);  in drm_dp_get_one_sb_msg()
3874 	replylen = msg->curchunk_len + msg->curchunk_hdrlen - len;  in drm_dp_get_one_sb_msg()
3877 		len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);  in drm_dp_get_one_sb_msg()
3878 		ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,  in drm_dp_get_one_sb_msg()
3881 			drm_dbg_kms(mgr->dev, "failed to read a chunk (len %d, ret %d)\n",  in drm_dp_get_one_sb_msg()
3888 			drm_dbg_kms(mgr->dev, "failed to build sideband msg\n");  in drm_dp_get_one_sb_msg()
3893 		replylen -= len;  in drm_dp_get_one_sb_msg()
3902 	struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv;  in drm_dp_mst_handle_down_rep()
3907 	/* Multi-packet message transmission, don't clear the reply */  in drm_dp_mst_handle_down_rep()
3908 	if (!msg->have_eomt)  in drm_dp_mst_handle_down_rep()
3912 	mutex_lock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
3913 	txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,  in drm_dp_mst_handle_down_rep()
3915 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
3918 	if (!txmsg || txmsg->dst != mstb) {  in drm_dp_mst_handle_down_rep()
3921 		hdr = &msg->initial_hdr;  in drm_dp_mst_handle_down_rep()
3922 		drm_dbg_kms(mgr->dev, "Got MST reply with no msg %p %d %d %02x %02x\n",  in drm_dp_mst_handle_down_rep()
3923 			    mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg[0]);  in drm_dp_mst_handle_down_rep()
3927 	drm_dp_sideband_parse_reply(mgr, msg, &txmsg->reply);  in drm_dp_mst_handle_down_rep()
3929 	if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_handle_down_rep()
3930 		drm_dbg_kms(mgr->dev,  in drm_dp_mst_handle_down_rep()
3932 			    txmsg->reply.req_type,  in drm_dp_mst_handle_down_rep()
3933 			    drm_dp_mst_req_type_str(txmsg->reply.req_type),  in drm_dp_mst_handle_down_rep()
3934 			    txmsg->reply.u.nak.reason,  in drm_dp_mst_handle_down_rep()
3935 			    drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),  in drm_dp_mst_handle_down_rep()
3936 			    txmsg->reply.u.nak.nak_data);  in drm_dp_mst_handle_down_rep()
3942 	mutex_lock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
3943 	txmsg->state = DRM_DP_SIDEBAND_TX_RX;  in drm_dp_mst_handle_down_rep()
3944 	list_del(&txmsg->next);  in drm_dp_mst_handle_down_rep()
3945 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_handle_down_rep()
3947 	wake_up_all(&mgr->tx_waitq);  in drm_dp_mst_handle_down_rep()
3965 	struct drm_dp_sideband_msg_req_body *msg = &up_req->msg;  in drm_dp_mst_process_up_req()
3966 	struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr;  in drm_dp_mst_process_up_req()
3969 	if (hdr->broadcast) {  in drm_dp_mst_process_up_req()
3972 		if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY)  in drm_dp_mst_process_up_req()
3973 			guid = msg->u.conn_stat.guid;  in drm_dp_mst_process_up_req()
3974 		else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)  in drm_dp_mst_process_up_req()
3975 			guid = msg->u.resource_stat.guid;  in drm_dp_mst_process_up_req()
3980 		mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad);  in drm_dp_mst_process_up_req()
3984 		drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr->lct);  in drm_dp_mst_process_up_req()
3989 	if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) {  in drm_dp_mst_process_up_req()
3990 		dowork = drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat);  in drm_dp_mst_process_up_req()
3997 		queue_work(system_long_wq, &mgr->work);  in drm_dp_mst_process_up_req()
4009 	mutex_lock(&mgr->probe_lock);  in drm_dp_mst_up_req_work()
4011 		mutex_lock(&mgr->up_req_lock);  in drm_dp_mst_up_req_work()
4012 		up_req = list_first_entry_or_null(&mgr->up_req_list,  in drm_dp_mst_up_req_work()
4016 			list_del(&up_req->next);  in drm_dp_mst_up_req_work()
4017 		mutex_unlock(&mgr->up_req_lock);  in drm_dp_mst_up_req_work()
4025 	mutex_unlock(&mgr->probe_lock);  in drm_dp_mst_up_req_work()
4028 		drm_kms_helper_hotplug_event(mgr->dev);  in drm_dp_mst_up_req_work()
4038 	if (!mgr->up_req_recv.have_eomt)  in drm_dp_mst_handle_up_req()
4043 		return -ENOMEM;  in drm_dp_mst_handle_up_req()
4045 	INIT_LIST_HEAD(&up_req->next);  in drm_dp_mst_handle_up_req()
4047 	drm_dp_sideband_parse_req(mgr, &mgr->up_req_recv, &up_req->msg);  in drm_dp_mst_handle_up_req()
4049 	if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&  in drm_dp_mst_handle_up_req()
4050 	    up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4051 		drm_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n",  in drm_dp_mst_handle_up_req()
4052 			    up_req->msg.req_type);  in drm_dp_mst_handle_up_req()
4057 	drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type,  in drm_dp_mst_handle_up_req()
4060 	if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4062 			&up_req->msg.u.conn_stat;  in drm_dp_mst_handle_up_req()
4064 		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()
4065 			    conn_stat->port_number,  in drm_dp_mst_handle_up_req()
4066 			    conn_stat->legacy_device_plug_status,  in drm_dp_mst_handle_up_req()
4067 			    conn_stat->displayport_device_plug_status,  in drm_dp_mst_handle_up_req()
4068 			    conn_stat->message_capability_status,  in drm_dp_mst_handle_up_req()
4069 			    conn_stat->input_port,  in drm_dp_mst_handle_up_req()
4070 			    conn_stat->peer_device_type);  in drm_dp_mst_handle_up_req()
4071 	} else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {  in drm_dp_mst_handle_up_req()
4073 			&up_req->msg.u.resource_stat;  in drm_dp_mst_handle_up_req()
4075 		drm_dbg_kms(mgr->dev, "Got RSN: pn: %d avail_pbn %d\n",  in drm_dp_mst_handle_up_req()
4076 			    res_stat->port_number,  in drm_dp_mst_handle_up_req()
4077 			    res_stat->available_pbn);  in drm_dp_mst_handle_up_req()
4080 	up_req->hdr = mgr->up_req_recv.initial_hdr;  in drm_dp_mst_handle_up_req()
4081 	mutex_lock(&mgr->up_req_lock);  in drm_dp_mst_handle_up_req()
4082 	list_add_tail(&up_req->next, &mgr->up_req_list);  in drm_dp_mst_handle_up_req()
4083 	mutex_unlock(&mgr->up_req_lock);  in drm_dp_mst_handle_up_req()
4084 	queue_work(system_long_wq, &mgr->up_req_work);  in drm_dp_mst_handle_up_req()
4087 	memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));  in drm_dp_mst_handle_up_req()
4092  * drm_dp_mst_hpd_irq_handle_event() - MST hotplug IRQ handle MST event
4100  * topology manager will process the sideband messages received
4120 	if (sc != mgr->sink_count) {  in drm_dp_mst_hpd_irq_handle_event()
4121 		mgr->sink_count = sc;  in drm_dp_mst_hpd_irq_handle_event()
4142  * drm_dp_mst_hpd_irq_send_new_request() - MST hotplug IRQ kick off new request
4155 	mutex_lock(&mgr->qlock);  in drm_dp_mst_hpd_irq_send_new_request()
4156 	txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,  in drm_dp_mst_hpd_irq_send_new_request()
4160 	    txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||  in drm_dp_mst_hpd_irq_send_new_request()
4161 	    txmsg->state == DRM_DP_SIDEBAND_TX_SENT)  in drm_dp_mst_hpd_irq_send_new_request()
4163 	mutex_unlock(&mgr->qlock);  in drm_dp_mst_hpd_irq_send_new_request()
4170  * drm_dp_mst_detect_port() - get connection status for an MST port
4191 	ret = drm_modeset_lock(&mgr->base.lock, ctx);  in drm_dp_mst_detect_port()
4197 	if (!port->ddps)  in drm_dp_mst_detect_port()
4200 	switch (port->pdt) {  in drm_dp_mst_detect_port()
4204 		if (!port->mcs)  in drm_dp_mst_detect_port()
4210 		/* for logical ports - cache the EDID */  in drm_dp_mst_detect_port()
4211 		if (port->port_num >= DP_MST_LOGICAL_PORT_0 && !port->cached_edid)  in drm_dp_mst_detect_port()
4212 			port->cached_edid = drm_edid_read_ddc(connector, &port->aux.ddc);  in drm_dp_mst_detect_port()
4215 		if (port->ldps)  in drm_dp_mst_detect_port()
4226  * drm_dp_mst_edid_read() - get EDID for an MST port
4246 	if (port->cached_edid)  in drm_dp_mst_edid_read()
4247 		drm_edid = drm_edid_dup(port->cached_edid);  in drm_dp_mst_edid_read()
4249 		drm_edid = drm_edid_read_ddc(connector, &port->aux.ddc);  in drm_dp_mst_edid_read()
4258  * drm_dp_mst_get_edid() - get EDID for an MST port
4287  * drm_dp_atomic_find_time_slots() - Find and add time slots to the state
4289  * @mgr: MST topology manager for the port
4297  * atomic state is added whenever the state of payloads in the topology changes.
4327 	conn_state = drm_atomic_get_new_connector_state(state, port->connector);  in drm_dp_atomic_find_time_slots()
4328 	topology_state->pending_crtc_mask |= drm_crtc_mask(conn_state->crtc);  in drm_dp_atomic_find_time_slots()
4333 		prev_slots = payload->time_slots;  in drm_dp_atomic_find_time_slots()
4334 		prev_bw = payload->pbn;  in drm_dp_atomic_find_time_slots()
4341 		if (drm_WARN_ON(mgr->dev, payload->delete)) {  in drm_dp_atomic_find_time_slots()
4342 			drm_err(mgr->dev,  in drm_dp_atomic_find_time_slots()
4345 			return -EINVAL;  in drm_dp_atomic_find_time_slots()
4349 	req_slots = DIV_ROUND_UP(dfixed_const(pbn), topology_state->pbn_div.full);  in drm_dp_atomic_find_time_slots()
4351 	drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] TU %d -> %d\n",  in drm_dp_atomic_find_time_slots()
4352 		       port->connector->base.id, port->connector->name,  in drm_dp_atomic_find_time_slots()
4354 	drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n",  in drm_dp_atomic_find_time_slots()
4355 		       port->connector->base.id, port->connector->name,  in drm_dp_atomic_find_time_slots()
4362 			return -ENOMEM;  in drm_dp_atomic_find_time_slots()
4365 		payload->port = port;  in drm_dp_atomic_find_time_slots()
4366 		payload->vc_start_slot = -1;  in drm_dp_atomic_find_time_slots()
4367 		payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE;  in drm_dp_atomic_find_time_slots()
4368 		list_add(&payload->next, &topology_state->payloads);  in drm_dp_atomic_find_time_slots()
4370 	payload->time_slots = req_slots;  in drm_dp_atomic_find_time_slots()
4371 	payload->pbn = pbn;  in drm_dp_atomic_find_time_slots()
4378  * drm_dp_atomic_release_time_slots() - Release allocated time slots
4380  * @mgr: MST topology manager for the port
4389  * topology.
4413 	old_conn_state = drm_atomic_get_old_connector_state(state, port->connector);  in drm_dp_atomic_release_time_slots()
4414 	if (!old_conn_state->crtc)  in drm_dp_atomic_release_time_slots()
4418 	new_conn_state = drm_atomic_get_new_connector_state(state, port->connector);  in drm_dp_atomic_release_time_slots()
4419 	if (new_conn_state->crtc) {  in drm_dp_atomic_release_time_slots()
4421 			drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);  in drm_dp_atomic_release_time_slots()
4427 		if (!crtc_state->mode_changed && !crtc_state->connectors_changed)  in drm_dp_atomic_release_time_slots()
4435 	topology_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc);  in drm_dp_atomic_release_time_slots()
4441 		drm_err(mgr->dev, "No payload for [MST PORT:%p] found in mst state %p\n",  in drm_dp_atomic_release_time_slots()
4442 			port, &topology_state->base);  in drm_dp_atomic_release_time_slots()
4443 		return -EINVAL;  in drm_dp_atomic_release_time_slots()
4446 	if (new_conn_state->crtc)  in drm_dp_atomic_release_time_slots()
4449 	drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, payload->time_slots);  in drm_dp_atomic_release_time_slots()
4450 	if (!payload->delete) {  in drm_dp_atomic_release_time_slots()
4451 		payload->pbn = 0;  in drm_dp_atomic_release_time_slots()
4452 		payload->delete = true;  in drm_dp_atomic_release_time_slots()
4453 		topology_state->payload_mask &= ~BIT(payload->vcpi - 1);  in drm_dp_atomic_release_time_slots()
4461  * drm_dp_mst_atomic_setup_commit() - setup_commit hook for MST helpers
4465  * currently assigned to an MST topology. Drivers must call this hook from their
4480 		if (!mst_state->pending_crtc_mask)  in drm_dp_mst_atomic_setup_commit()
4483 		num_commit_deps = hweight32(mst_state->pending_crtc_mask);  in drm_dp_mst_atomic_setup_commit()
4484 		mst_state->commit_deps = kmalloc_array(num_commit_deps,  in drm_dp_mst_atomic_setup_commit()
4485 						       sizeof(*mst_state->commit_deps), GFP_KERNEL);  in drm_dp_mst_atomic_setup_commit()
4486 		if (!mst_state->commit_deps)  in drm_dp_mst_atomic_setup_commit()
4487 			return -ENOMEM;  in drm_dp_mst_atomic_setup_commit()
4488 		mst_state->num_commit_deps = num_commit_deps;  in drm_dp_mst_atomic_setup_commit()
4492 			if (mst_state->pending_crtc_mask & drm_crtc_mask(crtc)) {  in drm_dp_mst_atomic_setup_commit()
4493 				mst_state->commit_deps[commit_idx++] =  in drm_dp_mst_atomic_setup_commit()
4494 					drm_crtc_commit_get(crtc_state->commit);  in drm_dp_mst_atomic_setup_commit()
4504  * drm_dp_mst_atomic_wait_for_dependencies() - Wait for all pending commits on MST topologies,
4509  * touched CRTCs that were/are on an MST topology to be programmed to hardware and flipped to before
4510  * returning. This is to prevent multiple non-blocking commits affecting an MST topology from racing
4512  * the modeset objects in these commits share are an MST topology.
4516  * determined at commit-time) from the previous state.
4529 		for (j = 0; j < old_mst_state->num_commit_deps; j++) {  in drm_dp_mst_atomic_wait_for_dependencies()
4530 			ret = drm_crtc_commit_wait(old_mst_state->commit_deps[j]);  in drm_dp_mst_atomic_wait_for_dependencies()
4532 				drm_err(state->dev, "Failed to wait for %s: %d\n",  in drm_dp_mst_atomic_wait_for_dependencies()
4533 					old_mst_state->commit_deps[j]->crtc->name, ret);  in drm_dp_mst_atomic_wait_for_dependencies()
4539 		list_for_each_entry(old_payload, &old_mst_state->payloads, next) {  in drm_dp_mst_atomic_wait_for_dependencies()
4540 			if (old_payload->delete)  in drm_dp_mst_atomic_wait_for_dependencies()
4544 								       old_payload->port);  in drm_dp_mst_atomic_wait_for_dependencies()
4545 			new_payload->vc_start_slot = old_payload->vc_start_slot;  in drm_dp_mst_atomic_wait_for_dependencies()
4546 			new_payload->payload_allocation_status =  in drm_dp_mst_atomic_wait_for_dependencies()
4547 							old_payload->payload_allocation_status;  in drm_dp_mst_atomic_wait_for_dependencies()
4554  * drm_dp_mst_root_conn_atomic_check() - Serialize CRTC commits on MST-capable connectors operating
4557  * @mgr: The MST topology manager for the &drm_connector
4560  * serialize non-blocking commits happening on the real DP connector of an MST topology switching
4561  * into/away from MST mode - as the CRTC on the real DP connector and the CRTCs on the connector's
4562  * MST topology will never share the same &drm_encoder.
4565  * state to determine if it is about to have a modeset - and then pulling in the MST topology state
4578 	struct drm_atomic_state *state = new_conn_state->state;  in drm_dp_mst_root_conn_atomic_check()
4580 		drm_atomic_get_old_connector_state(state, new_conn_state->connector);  in drm_dp_mst_root_conn_atomic_check()
4584 	if (new_conn_state->crtc) {  in drm_dp_mst_root_conn_atomic_check()
4585 		crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);  in drm_dp_mst_root_conn_atomic_check()
4591 			mst_state->pending_crtc_mask |= drm_crtc_mask(new_conn_state->crtc);  in drm_dp_mst_root_conn_atomic_check()
4595 	if (old_conn_state->crtc) {  in drm_dp_mst_root_conn_atomic_check()
4596 		crtc_state = drm_atomic_get_new_crtc_state(state, old_conn_state->crtc);  in drm_dp_mst_root_conn_atomic_check()
4604 			mst_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc);  in drm_dp_mst_root_conn_atomic_check()
4613  * drm_dp_mst_update_slots() - updates the slot info depending on the DP ecoding format
4620 		mst_state->total_avail_slots = 64;  in drm_dp_mst_update_slots()
4621 		mst_state->start_slot = 0;  in drm_dp_mst_update_slots()
4623 		mst_state->total_avail_slots = 63;  in drm_dp_mst_update_slots()
4624 		mst_state->start_slot = 1;  in drm_dp_mst_update_slots()
4640 	drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,  in drm_dp_dpcd_write_payload()
4647 	ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);  in drm_dp_dpcd_write_payload()
4649 		drm_dbg_kms(mgr->dev, "failed to write payload allocation %d\n", ret);  in drm_dp_dpcd_write_payload()
4654 	ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);  in drm_dp_dpcd_write_payload()
4656 		drm_dbg_kms(mgr->dev, "failed to read payload table status %d\n", ret);  in drm_dp_dpcd_write_payload()
4666 		drm_dbg_kms(mgr->dev, "status not set after read payload table status %d\n",  in drm_dp_dpcd_write_payload()
4668 		ret = -EINVAL;  in drm_dp_dpcd_write_payload()
4689  * drm_dp_check_act_status() - Polls for ACT handled status.
4693  * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really
4710 	ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,  in drm_dp_check_act_status()
4714 		drm_err(mgr->dev, "Failed to get ACT after %dms, last status: %02x\n",  in drm_dp_check_act_status()
4716 		return -EINVAL;  in drm_dp_check_act_status()
4719 		 * Failure here isn't unexpected - the hub may have  in drm_dp_check_act_status()
4722 		drm_dbg_kms(mgr->dev, "Failed to read payload table status: %d\n", status);  in drm_dp_check_act_status()
4731  * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
4768 	queue_work(system_long_wq, &mgr->tx_work);  in drm_dp_mst_kick_tx()
4797 	int tabs = mstb->lct;  in drm_dp_mst_dump_mstb()
4805 	seq_printf(m, "%smstb - [%p]: num_ports: %d\n", prefix, mstb, mstb->num_ports);  in drm_dp_mst_dump_mstb()
4806 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_dump_mstb()
4807 		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()
4809 			   port->port_num,  in drm_dp_mst_dump_mstb()
4811 			   port->input ? "input" : "output",  in drm_dp_mst_dump_mstb()
4812 			   pdt_to_string(port->pdt),  in drm_dp_mst_dump_mstb()
4813 			   port->ddps,  in drm_dp_mst_dump_mstb()
4814 			   port->ldps,  in drm_dp_mst_dump_mstb()
4815 			   port->num_sdp_streams,  in drm_dp_mst_dump_mstb()
4816 			   port->num_sdp_stream_sinks,  in drm_dp_mst_dump_mstb()
4817 			   port->fec_capable ? "true" : "false",  in drm_dp_mst_dump_mstb()
4818 			   port->connector);  in drm_dp_mst_dump_mstb()
4819 		if (port->mstb)  in drm_dp_mst_dump_mstb()
4820 			drm_dp_mst_dump_mstb(m, port->mstb);  in drm_dp_mst_dump_mstb()
4832 		if (drm_dp_dpcd_read(mgr->aux,  in dump_dp_payload_table()
4846 	mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);  in fetch_monitor_name()
4852  * drm_dp_mst_dump_topology(): dump topology to seq file.
4854  * @mgr: manager to dump current topology for.
4856  * helper to dump MST topology to a seq file for debugfs.
4872 	mutex_lock(&mgr->lock);  in drm_dp_mst_dump_topology()
4873 	if (mgr->mst_primary)  in drm_dp_mst_dump_topology()
4874 		drm_dp_mst_dump_mstb(m, mgr->mst_primary);  in drm_dp_mst_dump_topology()
4877 	mutex_unlock(&mgr->lock);  in drm_dp_mst_dump_topology()
4879 	ret = drm_modeset_lock_single_interruptible(&mgr->base.lock);  in drm_dp_mst_dump_topology()
4883 	state = to_drm_dp_mst_topology_state(mgr->base.state);  in drm_dp_mst_dump_topology()
4886 		   state->payload_mask, mgr->max_payloads, state->start_slot,  in drm_dp_mst_dump_topology()
4887 		   dfixed_trunc(state->pbn_div));  in drm_dp_mst_dump_topology()
4890 	for (i = 0; i < mgr->max_payloads; i++) {  in drm_dp_mst_dump_topology()
4891 		list_for_each_entry(payload, &state->payloads, next) {  in drm_dp_mst_dump_topology()
4894 			if (payload->vcpi != i || payload->delete)  in drm_dp_mst_dump_topology()
4897 			fetch_monitor_name(mgr, payload->port, name, sizeof(name));  in drm_dp_mst_dump_topology()
4898 			seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %8s %19s\n",  in drm_dp_mst_dump_topology()
4900 				   payload->port->port_num,  in drm_dp_mst_dump_topology()
4901 				   payload->vcpi,  in drm_dp_mst_dump_topology()
4902 				   payload->vc_start_slot,  in drm_dp_mst_dump_topology()
4903 				   payload->vc_start_slot + payload->time_slots - 1,  in drm_dp_mst_dump_topology()
4904 				   payload->pbn,  in drm_dp_mst_dump_topology()
4905 				   payload->dsc_enabled ? "Y" : "N",  in drm_dp_mst_dump_topology()
4906 				   status[payload->payload_allocation_status],  in drm_dp_mst_dump_topology()
4912 	mutex_lock(&mgr->lock);  in drm_dp_mst_dump_topology()
4913 	if (mgr->mst_primary) {  in drm_dp_mst_dump_topology()
4917 		if (drm_dp_read_dpcd_caps(mgr->aux, buf) < 0) {  in drm_dp_mst_dump_topology()
4923 		ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);  in drm_dp_mst_dump_topology()
4930 		ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);  in drm_dp_mst_dump_topology()
4938 		ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);  in drm_dp_mst_dump_topology()
4954 	mutex_unlock(&mgr->lock);  in drm_dp_mst_dump_topology()
4955 	drm_modeset_unlock(&mgr->base.lock);  in drm_dp_mst_dump_topology()
4963 	mutex_lock(&mgr->qlock);  in drm_dp_tx_work()
4964 	if (!list_empty(&mgr->tx_msg_downq))  in drm_dp_tx_work()
4966 	mutex_unlock(&mgr->qlock);  in drm_dp_tx_work()
4972 	drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs);  in drm_dp_delayed_destroy_port()
4974 	if (port->connector) {  in drm_dp_delayed_destroy_port()
4975 		drm_connector_unregister(port->connector);  in drm_dp_delayed_destroy_port()
4976 		drm_connector_put(port->connector);  in drm_dp_delayed_destroy_port()
4985 	struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;  in drm_dp_delayed_destroy_mstb()
4990 	mutex_lock(&mgr->lock);  in drm_dp_delayed_destroy_mstb()
4991 	list_for_each_entry_safe(port, port_tmp, &mstb->ports, next) {  in drm_dp_delayed_destroy_mstb()
4992 		list_del(&port->next);  in drm_dp_delayed_destroy_mstb()
4995 	mutex_unlock(&mgr->lock);  in drm_dp_delayed_destroy_mstb()
4998 	mutex_lock(&mstb->mgr->qlock);  in drm_dp_delayed_destroy_mstb()
4999 	list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next) {  in drm_dp_delayed_destroy_mstb()
5000 		if (txmsg->dst != mstb)  in drm_dp_delayed_destroy_mstb()
5003 		txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;  in drm_dp_delayed_destroy_mstb()
5004 		list_del(&txmsg->next);  in drm_dp_delayed_destroy_mstb()
5007 	mutex_unlock(&mstb->mgr->qlock);  in drm_dp_delayed_destroy_mstb()
5010 		wake_up_all(&mstb->mgr->tx_waitq);  in drm_dp_delayed_destroy_mstb()
5024 	 * connector lock before destroying the mstb/port, to avoid AB->BA  in drm_dp_delayed_destroy_work()
5033 			mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5034 			mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list,  in drm_dp_delayed_destroy_work()
5038 				list_del(&mstb->destroy_next);  in drm_dp_delayed_destroy_work()
5039 			mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5051 			mutex_lock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5052 			port = list_first_entry_or_null(&mgr->destroy_port_list,  in drm_dp_delayed_destroy_work()
5056 				list_del(&port->next);  in drm_dp_delayed_destroy_work()
5057 			mutex_unlock(&mgr->delayed_destroy_lock);  in drm_dp_delayed_destroy_work()
5069 		drm_kms_helper_hotplug_event(mgr->dev);  in drm_dp_delayed_destroy_work()
5076 		to_dp_mst_topology_state(obj->state);  in drm_dp_mst_duplicate_state()
5083 	__drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);  in drm_dp_mst_duplicate_state()
5085 	INIT_LIST_HEAD(&state->payloads);  in drm_dp_mst_duplicate_state()
5086 	state->commit_deps = NULL;  in drm_dp_mst_duplicate_state()
5087 	state->num_commit_deps = 0;  in drm_dp_mst_duplicate_state()
5088 	state->pending_crtc_mask = 0;  in drm_dp_mst_duplicate_state()
5090 	list_for_each_entry(pos, &old_state->payloads, next) {  in drm_dp_mst_duplicate_state()
5092 		if (pos->delete)  in drm_dp_mst_duplicate_state()
5099 		drm_dp_mst_get_port_malloc(payload->port);  in drm_dp_mst_duplicate_state()
5100 		list_add(&payload->next, &state->payloads);  in drm_dp_mst_duplicate_state()
5103 	return &state->base;  in drm_dp_mst_duplicate_state()
5106 	list_for_each_entry_safe(pos, payload, &state->payloads, next) {  in drm_dp_mst_duplicate_state()
5107 		drm_dp_mst_put_port_malloc(pos->port);  in drm_dp_mst_duplicate_state()
5123 	list_for_each_entry_safe(pos, tmp, &mst_state->payloads, next) {  in drm_dp_mst_destroy_state()
5125 		if (!pos->delete)  in drm_dp_mst_destroy_state()
5126 			drm_dp_mst_put_port_malloc(pos->port);  in drm_dp_mst_destroy_state()
5130 	for (i = 0; i < mst_state->num_commit_deps; i++)  in drm_dp_mst_destroy_state()
5131 		drm_crtc_commit_put(mst_state->commit_deps[i]);  in drm_dp_mst_destroy_state()
5133 	kfree(mst_state->commit_deps);  in drm_dp_mst_destroy_state()
5140 	while (port->parent) {  in drm_dp_mst_port_downstream_of_branch()
5141 		if (port->parent == branch)  in drm_dp_mst_port_downstream_of_branch()
5144 		if (port->parent->port_parent)  in drm_dp_mst_port_downstream_of_branch()
5145 			port = port->parent->port_parent;  in drm_dp_mst_port_downstream_of_branch()
5157 	if (!mgr->mst_primary)  in drm_dp_mst_port_downstream_of_parent_locked()
5160 	port = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary,  in drm_dp_mst_port_downstream_of_parent_locked()
5168 	parent = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary,  in drm_dp_mst_port_downstream_of_parent_locked()
5173 	if (!parent->mstb)  in drm_dp_mst_port_downstream_of_parent_locked()
5176 	return drm_dp_mst_port_downstream_of_branch(port, parent->mstb);  in drm_dp_mst_port_downstream_of_parent_locked()
5180  * drm_dp_mst_port_downstream_of_parent - check if a port is downstream of a parent port
5181  * @mgr: MST topology manager
5186  * %NULL - denoting the root port - the function returns %true if @port is in
5187  * @mgr's topology.
5196 	mutex_lock(&mgr->lock);  in drm_dp_mst_port_downstream_of_parent()
5198 	mutex_unlock(&mgr->lock);  in drm_dp_mst_port_downstream_of_parent()
5222 	list_for_each_entry(payload, &state->payloads, next) {  in drm_dp_mst_atomic_check_mstb_bw_limit()
5223 		if (!payload->pbn ||  in drm_dp_mst_atomic_check_mstb_bw_limit()
5224 		    !drm_dp_mst_port_downstream_of_branch(payload->port, mstb))  in drm_dp_mst_atomic_check_mstb_bw_limit()
5233 	if (mstb->port_parent)  in drm_dp_mst_atomic_check_mstb_bw_limit()
5234 		drm_dbg_atomic(mstb->mgr->dev,  in drm_dp_mst_atomic_check_mstb_bw_limit()
5236 			       mstb->port_parent->parent, mstb->port_parent, mstb);  in drm_dp_mst_atomic_check_mstb_bw_limit()
5238 		drm_dbg_atomic(mstb->mgr->dev, "[MSTB:%p] Checking bandwidth limits\n", mstb);  in drm_dp_mst_atomic_check_mstb_bw_limit()
5240 	list_for_each_entry(port, &mstb->ports, next) {  in drm_dp_mst_atomic_check_mstb_bw_limit()
5259 	if (port->pdt == DP_PEER_DEVICE_NONE)  in drm_dp_mst_atomic_check_port_bw_limit()
5262 	if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {  in drm_dp_mst_atomic_check_port_bw_limit()
5271 		if (!port->full_pbn) {  in drm_dp_mst_atomic_check_port_bw_limit()
5272 			drm_dbg_atomic(port->mgr->dev,  in drm_dp_mst_atomic_check_port_bw_limit()
5274 				       port->parent, port);  in drm_dp_mst_atomic_check_port_bw_limit()
5276 			return -EINVAL;  in drm_dp_mst_atomic_check_port_bw_limit()
5279 		pbn_used = payload->pbn;  in drm_dp_mst_atomic_check_port_bw_limit()
5281 		pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb,  in drm_dp_mst_atomic_check_port_bw_limit()
5288 	if (pbn_used > port->full_pbn) {  in drm_dp_mst_atomic_check_port_bw_limit()
5289 		drm_dbg_atomic(port->mgr->dev,  in drm_dp_mst_atomic_check_port_bw_limit()
5291 			       port->parent, port, pbn_used, port->full_pbn);  in drm_dp_mst_atomic_check_port_bw_limit()
5293 		return -ENOSPC;  in drm_dp_mst_atomic_check_port_bw_limit()
5296 	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()
5297 		       port->parent, port, pbn_used, port->full_pbn);  in drm_dp_mst_atomic_check_port_bw_limit()
5307 	int avail_slots = mst_state->total_avail_slots, payload_count = 0;  in drm_dp_mst_atomic_check_payload_alloc_limits()
5309 	list_for_each_entry(payload, &mst_state->payloads, next) {  in drm_dp_mst_atomic_check_payload_alloc_limits()
5310 		/* Releasing payloads is always OK-even if the port is gone */  in drm_dp_mst_atomic_check_payload_alloc_limits()
5311 		if (payload->delete) {  in drm_dp_mst_atomic_check_payload_alloc_limits()
5312 			drm_dbg_atomic(mgr->dev, "[MST PORT:%p] releases all time slots\n",  in drm_dp_mst_atomic_check_payload_alloc_limits()
5313 				       payload->port);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5317 		drm_dbg_atomic(mgr->dev, "[MST PORT:%p] requires %d time slots\n",  in drm_dp_mst_atomic_check_payload_alloc_limits()
5318 			       payload->port, payload->time_slots);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5320 		avail_slots -= payload->time_slots;  in drm_dp_mst_atomic_check_payload_alloc_limits()
5322 			drm_dbg_atomic(mgr->dev,  in drm_dp_mst_atomic_check_payload_alloc_limits()
5324 				       payload->port, mst_state, avail_slots + payload->time_slots);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5325 			return -ENOSPC;  in drm_dp_mst_atomic_check_payload_alloc_limits()
5328 		if (++payload_count > mgr->max_payloads) {  in drm_dp_mst_atomic_check_payload_alloc_limits()
5329 			drm_dbg_atomic(mgr->dev,  in drm_dp_mst_atomic_check_payload_alloc_limits()
5331 				       mgr, mst_state, mgr->max_payloads);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5332 			return -EINVAL;  in drm_dp_mst_atomic_check_payload_alloc_limits()
5336 		if (!payload->vcpi) {  in drm_dp_mst_atomic_check_payload_alloc_limits()
5337 			payload->vcpi = ffz(mst_state->payload_mask) + 1;  in drm_dp_mst_atomic_check_payload_alloc_limits()
5338 			drm_dbg_atomic(mgr->dev, "[MST PORT:%p] assigned VCPI #%d\n",  in drm_dp_mst_atomic_check_payload_alloc_limits()
5339 				       payload->port, payload->vcpi);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5340 			mst_state->payload_mask |= BIT(payload->vcpi - 1);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5345 		mst_state->pbn_div.full = dfixed_const(0);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5347 	drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU pbn_div=%d avail=%d used=%d\n",  in drm_dp_mst_atomic_check_payload_alloc_limits()
5348 		       mgr, mst_state, dfixed_trunc(mst_state->pbn_div), avail_slots,  in drm_dp_mst_atomic_check_payload_alloc_limits()
5349 		       mst_state->total_avail_slots - avail_slots);  in drm_dp_mst_atomic_check_payload_alloc_limits()
5357  * @mgr: MST topology manager
5359  * Whenever there is a change in mst topology
5362  * CRTCs in that topology
5381 	list_for_each_entry(pos, &mst_state->payloads, next) {  in drm_dp_mst_add_affected_dsc_crtcs()
5383 		connector = pos->port->connector;  in drm_dp_mst_add_affected_dsc_crtcs()
5386 			return -EINVAL;  in drm_dp_mst_add_affected_dsc_crtcs()
5393 		crtc = conn_state->crtc;  in drm_dp_mst_add_affected_dsc_crtcs()
5398 		if (!drm_dp_mst_dsc_aux_for_port(pos->port))  in drm_dp_mst_add_affected_dsc_crtcs()
5401 		crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc);  in drm_dp_mst_add_affected_dsc_crtcs()
5406 		drm_dbg_atomic(mgr->dev, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n",  in drm_dp_mst_add_affected_dsc_crtcs()
5409 		crtc_state->mode_changed = true;  in drm_dp_mst_add_affected_dsc_crtcs()
5416  * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off
5436 	mst_state = drm_atomic_get_mst_topology_state(state, port->mgr);  in drm_dp_mst_atomic_enable_dsc()
5442 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5445 		return -EINVAL;  in drm_dp_mst_atomic_enable_dsc()
5448 	if (payload->dsc_enabled == enable) {  in drm_dp_mst_atomic_enable_dsc()
5449 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5451 			       port, enable, payload->time_slots);  in drm_dp_mst_atomic_enable_dsc()
5452 		time_slots = payload->time_slots;  in drm_dp_mst_atomic_enable_dsc()
5456 		time_slots = drm_dp_atomic_find_time_slots(state, port->mgr, port, pbn);  in drm_dp_mst_atomic_enable_dsc()
5457 		drm_dbg_atomic(state->dev,  in drm_dp_mst_atomic_enable_dsc()
5461 			return -EINVAL;  in drm_dp_mst_atomic_enable_dsc()
5464 	payload->dsc_enabled = enable;  in drm_dp_mst_atomic_enable_dsc()
5471  * drm_dp_mst_atomic_check_mgr - Check the atomic state of an MST topology manager
5477  * Checks the given MST manager's topology state for an atomic update to ensure
5491  *   - 0 if the new state is valid
5492  *   - %-ENOSPC, if the new state is invalid, because of BW limitation
5495  *         - The non-root port where a BW limit check failed
5500  *         - %NULL if the BW limit check failed at the root port
5504  *   - %-EINVAL, if the new state is invalid, because the root port has
5516 	if (!mgr->mst_state)  in drm_dp_mst_atomic_check_mgr()
5519 	mutex_lock(&mgr->lock);  in drm_dp_mst_atomic_check_mgr()
5520 	ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary,  in drm_dp_mst_atomic_check_mgr()
5523 	mutex_unlock(&mgr->lock);  in drm_dp_mst_atomic_check_mgr()
5533  * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an
5537  * Checks the given topology state for an atomic update to ensure that it's
5580  * drm_atomic_get_mst_topology_state: get MST topology state
5582  * @mgr: MST topology manager, also the private object in this case
5586  * topology object.
5590  * The MST topology state or error pointer.
5595 	return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));  in drm_atomic_get_mst_topology_state()
5600  * drm_atomic_get_old_mst_topology_state: get old MST topology state in atomic state, if any
5602  * @mgr: MST topology manager, also the private object in this case
5606  * topology object.
5610  * The old MST topology state, or NULL if there's no topology state for this MST mgr
5618 		drm_atomic_get_old_private_obj_state(state, &mgr->base);  in drm_atomic_get_old_mst_topology_state()
5625  * drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any
5627  * @mgr: MST topology manager, also the private object in this case
5631  * topology object.
5635  * The new MST topology state, or NULL if there's no topology state for this MST mgr
5643 		drm_atomic_get_new_private_obj_state(state, &mgr->base);  in drm_atomic_get_new_mst_topology_state()
5650  * drm_dp_mst_topology_mgr_init - initialise a topology manager
5652  * @dev: device providing this structure - for i2c addition.
5667 	mutex_init(&mgr->lock);  in drm_dp_mst_topology_mgr_init()
5668 	mutex_init(&mgr->qlock);  in drm_dp_mst_topology_mgr_init()
5669 	mutex_init(&mgr->delayed_destroy_lock);  in drm_dp_mst_topology_mgr_init()
5670 	mutex_init(&mgr->up_req_lock);  in drm_dp_mst_topology_mgr_init()
5671 	mutex_init(&mgr->probe_lock);  in drm_dp_mst_topology_mgr_init()
5673 	mutex_init(&mgr->topology_ref_history_lock);  in drm_dp_mst_topology_mgr_init()
5676 	INIT_LIST_HEAD(&mgr->tx_msg_downq);  in drm_dp_mst_topology_mgr_init()
5677 	INIT_LIST_HEAD(&mgr->destroy_port_list);  in drm_dp_mst_topology_mgr_init()
5678 	INIT_LIST_HEAD(&mgr->destroy_branch_device_list);  in drm_dp_mst_topology_mgr_init()
5679 	INIT_LIST_HEAD(&mgr->up_req_list);  in drm_dp_mst_topology_mgr_init()
5683 	 * requeuing will be also flushed when deiniting the topology manager.  in drm_dp_mst_topology_mgr_init()
5685 	mgr->delayed_destroy_wq = alloc_ordered_workqueue("drm_dp_mst_wq", 0);  in drm_dp_mst_topology_mgr_init()
5686 	if (mgr->delayed_destroy_wq == NULL)  in drm_dp_mst_topology_mgr_init()
5687 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5689 	INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);  in drm_dp_mst_topology_mgr_init()
5690 	INIT_WORK(&mgr->tx_work, drm_dp_tx_work);  in drm_dp_mst_topology_mgr_init()
5691 	INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work);  in drm_dp_mst_topology_mgr_init()
5692 	INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work);  in drm_dp_mst_topology_mgr_init()
5693 	init_waitqueue_head(&mgr->tx_waitq);  in drm_dp_mst_topology_mgr_init()
5694 	mgr->dev = dev;  in drm_dp_mst_topology_mgr_init()
5695 	mgr->aux = aux;  in drm_dp_mst_topology_mgr_init()
5696 	mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;  in drm_dp_mst_topology_mgr_init()
5697 	mgr->max_payloads = max_payloads;  in drm_dp_mst_topology_mgr_init()
5698 	mgr->conn_base_id = conn_base_id;  in drm_dp_mst_topology_mgr_init()
5702 		return -ENOMEM;  in drm_dp_mst_topology_mgr_init()
5704 	mst_state->total_avail_slots = 63;  in drm_dp_mst_topology_mgr_init()
5705 	mst_state->start_slot = 1;  in drm_dp_mst_topology_mgr_init()
5707 	mst_state->mgr = mgr;  in drm_dp_mst_topology_mgr_init()
5708 	INIT_LIST_HEAD(&mst_state->payloads);  in drm_dp_mst_topology_mgr_init()
5710 	drm_atomic_private_obj_init(dev, &mgr->base,  in drm_dp_mst_topology_mgr_init()
5711 				    &mst_state->base,  in drm_dp_mst_topology_mgr_init()
5719  * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
5725 	flush_work(&mgr->work);  in drm_dp_mst_topology_mgr_destroy()
5727 	if (mgr->delayed_destroy_wq) {  in drm_dp_mst_topology_mgr_destroy()
5728 		destroy_workqueue(mgr->delayed_destroy_wq);  in drm_dp_mst_topology_mgr_destroy()
5729 		mgr->delayed_destroy_wq = NULL;  in drm_dp_mst_topology_mgr_destroy()
5731 	mgr->dev = NULL;  in drm_dp_mst_topology_mgr_destroy()
5732 	mgr->aux = NULL;  in drm_dp_mst_topology_mgr_destroy()
5733 	drm_atomic_private_obj_fini(&mgr->base);  in drm_dp_mst_topology_mgr_destroy()
5734 	mgr->funcs = NULL;  in drm_dp_mst_topology_mgr_destroy()
5736 	mutex_destroy(&mgr->delayed_destroy_lock);  in drm_dp_mst_topology_mgr_destroy()
5737 	mutex_destroy(&mgr->qlock);  in drm_dp_mst_topology_mgr_destroy()
5738 	mutex_destroy(&mgr->lock);  in drm_dp_mst_topology_mgr_destroy()
5739 	mutex_destroy(&mgr->up_req_lock);  in drm_dp_mst_topology_mgr_destroy()
5740 	mutex_destroy(&mgr->probe_lock);  in drm_dp_mst_topology_mgr_destroy()
5742 	mutex_destroy(&mgr->topology_ref_history_lock);  in drm_dp_mst_topology_mgr_destroy()
5751 	if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)  in remote_i2c_read_ok()
5754 	for (i = 0; i < num - 1; i++) {  in remote_i2c_read_ok()
5760 	return msgs[num - 1].flags & I2C_M_RD &&  in remote_i2c_read_ok()
5761 		msgs[num - 1].len <= 0xff;  in remote_i2c_read_ok()
5768 	for (i = 0; i < num - 1; i++) {  in remote_i2c_write_ok()
5774 	return !(msgs[num - 1].flags & I2C_M_RD) && msgs[num - 1].len <= 0xff;  in remote_i2c_write_ok()
5781 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_read()
5789 	msg.u.i2c_read.num_transactions = num - 1;  in drm_dp_mst_i2c_read()
5790 	msg.u.i2c_read.port_number = port->port_num;  in drm_dp_mst_i2c_read()
5791 	for (i = 0; i < num - 1; i++) {  in drm_dp_mst_i2c_read()
5797 	msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;  in drm_dp_mst_i2c_read()
5798 	msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;  in drm_dp_mst_i2c_read()
5802 		ret = -ENOMEM;  in drm_dp_mst_i2c_read()
5806 	txmsg->dst = mstb;  in drm_dp_mst_i2c_read()
5814 		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_i2c_read()
5815 			ret = -EREMOTEIO;  in drm_dp_mst_i2c_read()
5818 		if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {  in drm_dp_mst_i2c_read()
5819 			ret = -EIO;  in drm_dp_mst_i2c_read()
5822 		memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);  in drm_dp_mst_i2c_read()
5834 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_write()
5842 		ret = -ENOMEM;  in drm_dp_mst_i2c_write()
5848 		msg.u.i2c_write.port_number = port->port_num;  in drm_dp_mst_i2c_write()
5854 		txmsg->dst = mstb;  in drm_dp_mst_i2c_write()
5861 			if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {  in drm_dp_mst_i2c_write()
5862 				ret = -EREMOTEIO;  in drm_dp_mst_i2c_write()
5875 /* I2C device */
5879 	struct drm_dp_aux *aux = adapter->algo_data;  in drm_dp_mst_i2c_xfer()
5883 	struct drm_dp_mst_topology_mgr *mgr = port->mgr;  in drm_dp_mst_i2c_xfer()
5886 	mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);  in drm_dp_mst_i2c_xfer()
5888 		return -EREMOTEIO;  in drm_dp_mst_i2c_xfer()
5895 		drm_dbg_kms(mgr->dev, "Unsupported I2C transaction for MST device\n");  in drm_dp_mst_i2c_xfer()
5896 		ret = -EIO;  in drm_dp_mst_i2c_xfer()
5917  * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
5918  * @port: The port to add the I2C bus on
5924 	struct drm_dp_aux *aux = &port->aux;  in drm_dp_mst_register_i2c_bus()
5925 	struct device *parent_dev = port->mgr->dev->dev;  in drm_dp_mst_register_i2c_bus()
5927 	aux->ddc.algo = &drm_dp_mst_i2c_algo;  in drm_dp_mst_register_i2c_bus()
5928 	aux->ddc.algo_data = aux;  in drm_dp_mst_register_i2c_bus()
5929 	aux->ddc.retries = 3;  in drm_dp_mst_register_i2c_bus()
5931 	aux->ddc.owner = THIS_MODULE;  in drm_dp_mst_register_i2c_bus()
5933 	aux->ddc.dev.parent = parent_dev;  in drm_dp_mst_register_i2c_bus()
5934 	aux->ddc.dev.of_node = parent_dev->of_node;  in drm_dp_mst_register_i2c_bus()
5936 	strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev),  in drm_dp_mst_register_i2c_bus()
5937 		sizeof(aux->ddc.name));  in drm_dp_mst_register_i2c_bus()
5939 	return i2c_add_adapter(&aux->ddc);  in drm_dp_mst_register_i2c_bus()
5943  * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
5944  * @port: The port to remove the I2C bus from
5948 	i2c_del_adapter(&port->aux.ddc);  in drm_dp_mst_unregister_i2c_bus()
5952  * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device
5955  * A single physical MST hub object can be represented in the topology
5962  * May acquire mgr->lock
5971 	if (!port || port->dpcd_rev < DP_DPCD_REV_14)  in drm_dp_mst_is_virtual_dpcd()
5975 	if (port->port_num >= 8)  in drm_dp_mst_is_virtual_dpcd()
5978 	/* DP-to-HDMI Protocol Converter */  in drm_dp_mst_is_virtual_dpcd()
5979 	if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV &&  in drm_dp_mst_is_virtual_dpcd()
5980 	    !port->mcs &&  in drm_dp_mst_is_virtual_dpcd()
5981 	    port->ldps)  in drm_dp_mst_is_virtual_dpcd()
5984 	/* DP-to-DP */  in drm_dp_mst_is_virtual_dpcd()
5985 	mutex_lock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
5986 	if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&  in drm_dp_mst_is_virtual_dpcd()
5987 	    port->mstb &&  in drm_dp_mst_is_virtual_dpcd()
5988 	    port->mstb->num_ports == 2) {  in drm_dp_mst_is_virtual_dpcd()
5989 		list_for_each_entry(downstream_port, &port->mstb->ports, next) {  in drm_dp_mst_is_virtual_dpcd()
5990 			if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK &&  in drm_dp_mst_is_virtual_dpcd()
5991 			    !downstream_port->input) {  in drm_dp_mst_is_virtual_dpcd()
5992 				mutex_unlock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
5997 	mutex_unlock(&port->mgr->lock);  in drm_dp_mst_is_virtual_dpcd()
6003  * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC
6030 	if (port->parent->port_parent)  in drm_dp_mst_dsc_aux_for_port()
6031 		immediate_upstream_port = port->parent->port_parent;  in drm_dp_mst_dsc_aux_for_port()
6042 		    !fec_port->fec_capable)  in drm_dp_mst_dsc_aux_for_port()
6045 		fec_port = fec_port->parent->port_parent;  in drm_dp_mst_dsc_aux_for_port()
6048 	/* DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
6052 		if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
6055 		if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
6058 		if (drm_dp_dpcd_read(&immediate_upstream_port->aux,  in drm_dp_mst_dsc_aux_for_port()
6062 		/* Enpoint decompression with DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
6066 			port->passthrough_aux = &immediate_upstream_port->aux;  in drm_dp_mst_dsc_aux_for_port()
6067 			return &port->aux;  in drm_dp_mst_dsc_aux_for_port()
6070 		/* Virtual DPCD decompression with DP-to-DP peer device */  in drm_dp_mst_dsc_aux_for_port()
6071 		return &immediate_upstream_port->aux;  in drm_dp_mst_dsc_aux_for_port()
6074 	/* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */  in drm_dp_mst_dsc_aux_for_port()
6076 		return &port->aux;  in drm_dp_mst_dsc_aux_for_port()
6081 	 * - Physical aux has Synaptics OUI  in drm_dp_mst_dsc_aux_for_port()
6082 	 * - DPv1.4 or higher  in drm_dp_mst_dsc_aux_for_port()
6083 	 * - Port is on primary branch device  in drm_dp_mst_dsc_aux_for_port()
6084 	 * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG)  in drm_dp_mst_dsc_aux_for_port()
6087 		immediate_upstream_aux = &immediate_upstream_port->aux;  in drm_dp_mst_dsc_aux_for_port()
6089 		immediate_upstream_aux = port->mgr->aux;  in drm_dp_mst_dsc_aux_for_port()
6109 	 * connected to the GPU is capable of DSC -  in drm_dp_mst_dsc_aux_for_port()
6113 	if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
6116 	if (drm_dp_dpcd_read(&port->aux,  in drm_dp_mst_dsc_aux_for_port()
6121 		return &port->aux;  in drm_dp_mst_dsc_aux_for_port()