2 * Copyright © 2014 Red Hat
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/init.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/seq_file.h>
29 #include <linux/i2c.h>
30 #include <drm/drm_dp_mst_helper.h>
33 #include <drm/drm_fixed.h>
38 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
39 * protocol. The helpers contain a topology manager and bandwidth manager.
40 * The helpers encapsulate the sending and received of sideband msgs.
42 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr
*mgr
,
44 static int test_calc_pbn_mode(void);
46 static void drm_dp_put_port(struct drm_dp_mst_port
*port
);
48 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr
*mgr
,
50 struct drm_dp_payload
*payload
);
52 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr
*mgr
,
53 struct drm_dp_mst_port
*port
,
54 int offset
, int size
, u8
*bytes
);
56 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr
*mgr
,
57 struct drm_dp_mst_branch
*mstb
);
58 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr
*mgr
,
59 struct drm_dp_mst_branch
*mstb
,
60 struct drm_dp_mst_port
*port
);
61 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr
*mgr
,
64 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux
*aux
);
65 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux
*aux
);
66 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr
*mgr
);
67 /* sideband msg handling */
68 static u8
drm_dp_msg_header_crc4(const uint8_t *data
, size_t num_nibbles
)
73 int number_of_bits
= num_nibbles
* 4;
76 while (number_of_bits
!= 0) {
79 remainder
|= (data
[array_index
] & bitmask
) >> bitshift
;
87 if ((remainder
& 0x10) == 0x10)
92 while (number_of_bits
!= 0) {
95 if ((remainder
& 0x10) != 0)
102 static u8
drm_dp_msg_data_crc4(const uint8_t *data
, u8 number_of_bytes
)
107 int number_of_bits
= number_of_bytes
* 8;
110 while (number_of_bits
!= 0) {
113 remainder
|= (data
[array_index
] & bitmask
) >> bitshift
;
121 if ((remainder
& 0x100) == 0x100)
126 while (number_of_bits
!= 0) {
129 if ((remainder
& 0x100) != 0)
133 return remainder
& 0xff;
135 static inline u8
drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr
*hdr
)
138 size
+= (hdr
->lct
/ 2);
142 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr
*hdr
,
148 buf
[idx
++] = ((hdr
->lct
& 0xf) << 4) | (hdr
->lcr
& 0xf);
149 for (i
= 0; i
< (hdr
->lct
/ 2); i
++)
150 buf
[idx
++] = hdr
->rad
[i
];
151 buf
[idx
++] = (hdr
->broadcast
<< 7) | (hdr
->path_msg
<< 6) |
152 (hdr
->msg_len
& 0x3f);
153 buf
[idx
++] = (hdr
->somt
<< 7) | (hdr
->eomt
<< 6) | (hdr
->seqno
<< 4);
155 crc4
= drm_dp_msg_header_crc4(buf
, (idx
* 2) - 1);
156 buf
[idx
- 1] |= (crc4
& 0xf);
161 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr
*hdr
,
162 u8
*buf
, int buflen
, u8
*hdrlen
)
171 len
+= ((buf
[0] & 0xf0) >> 4) / 2;
174 crc4
= drm_dp_msg_header_crc4(buf
, (len
* 2) - 1);
176 if ((crc4
& 0xf) != (buf
[len
- 1] & 0xf)) {
177 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4
, buf
[len
- 1]);
181 hdr
->lct
= (buf
[0] & 0xf0) >> 4;
182 hdr
->lcr
= (buf
[0] & 0xf);
184 for (i
= 0; i
< (hdr
->lct
/ 2); i
++)
185 hdr
->rad
[i
] = buf
[idx
++];
186 hdr
->broadcast
= (buf
[idx
] >> 7) & 0x1;
187 hdr
->path_msg
= (buf
[idx
] >> 6) & 0x1;
188 hdr
->msg_len
= buf
[idx
] & 0x3f;
190 hdr
->somt
= (buf
[idx
] >> 7) & 0x1;
191 hdr
->eomt
= (buf
[idx
] >> 6) & 0x1;
192 hdr
->seqno
= (buf
[idx
] >> 4) & 0x1;
198 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body
*req
,
199 struct drm_dp_sideband_msg_tx
*raw
)
204 buf
[idx
++] = req
->req_type
& 0x7f;
206 switch (req
->req_type
) {
207 case DP_ENUM_PATH_RESOURCES
:
208 buf
[idx
] = (req
->u
.port_num
.port_number
& 0xf) << 4;
211 case DP_ALLOCATE_PAYLOAD
:
212 buf
[idx
] = (req
->u
.allocate_payload
.port_number
& 0xf) << 4 |
213 (req
->u
.allocate_payload
.number_sdp_streams
& 0xf);
215 buf
[idx
] = (req
->u
.allocate_payload
.vcpi
& 0x7f);
217 buf
[idx
] = (req
->u
.allocate_payload
.pbn
>> 8);
219 buf
[idx
] = (req
->u
.allocate_payload
.pbn
& 0xff);
221 for (i
= 0; i
< req
->u
.allocate_payload
.number_sdp_streams
/ 2; i
++) {
222 buf
[idx
] = ((req
->u
.allocate_payload
.sdp_stream_sink
[i
* 2] & 0xf) << 4) |
223 (req
->u
.allocate_payload
.sdp_stream_sink
[i
* 2 + 1] & 0xf);
226 if (req
->u
.allocate_payload
.number_sdp_streams
& 1) {
227 i
= req
->u
.allocate_payload
.number_sdp_streams
- 1;
228 buf
[idx
] = (req
->u
.allocate_payload
.sdp_stream_sink
[i
] & 0xf) << 4;
232 case DP_QUERY_PAYLOAD
:
233 buf
[idx
] = (req
->u
.query_payload
.port_number
& 0xf) << 4;
235 buf
[idx
] = (req
->u
.query_payload
.vcpi
& 0x7f);
238 case DP_REMOTE_DPCD_READ
:
239 buf
[idx
] = (req
->u
.dpcd_read
.port_number
& 0xf) << 4;
240 buf
[idx
] |= ((req
->u
.dpcd_read
.dpcd_address
& 0xf0000) >> 16) & 0xf;
242 buf
[idx
] = (req
->u
.dpcd_read
.dpcd_address
& 0xff00) >> 8;
244 buf
[idx
] = (req
->u
.dpcd_read
.dpcd_address
& 0xff);
246 buf
[idx
] = (req
->u
.dpcd_read
.num_bytes
);
250 case DP_REMOTE_DPCD_WRITE
:
251 buf
[idx
] = (req
->u
.dpcd_write
.port_number
& 0xf) << 4;
252 buf
[idx
] |= ((req
->u
.dpcd_write
.dpcd_address
& 0xf0000) >> 16) & 0xf;
254 buf
[idx
] = (req
->u
.dpcd_write
.dpcd_address
& 0xff00) >> 8;
256 buf
[idx
] = (req
->u
.dpcd_write
.dpcd_address
& 0xff);
258 buf
[idx
] = (req
->u
.dpcd_write
.num_bytes
);
260 memcpy(&buf
[idx
], req
->u
.dpcd_write
.bytes
, req
->u
.dpcd_write
.num_bytes
);
261 idx
+= req
->u
.dpcd_write
.num_bytes
;
263 case DP_REMOTE_I2C_READ
:
264 buf
[idx
] = (req
->u
.i2c_read
.port_number
& 0xf) << 4;
265 buf
[idx
] |= (req
->u
.i2c_read
.num_transactions
& 0x3);
267 for (i
= 0; i
< (req
->u
.i2c_read
.num_transactions
& 0x3); i
++) {
268 buf
[idx
] = req
->u
.i2c_read
.transactions
[i
].i2c_dev_id
& 0x7f;
270 buf
[idx
] = req
->u
.i2c_read
.transactions
[i
].num_bytes
;
272 memcpy(&buf
[idx
], req
->u
.i2c_read
.transactions
[i
].bytes
, req
->u
.i2c_read
.transactions
[i
].num_bytes
);
273 idx
+= req
->u
.i2c_read
.transactions
[i
].num_bytes
;
275 buf
[idx
] = (req
->u
.i2c_read
.transactions
[i
].no_stop_bit
& 0x1) << 5;
276 buf
[idx
] |= (req
->u
.i2c_read
.transactions
[i
].i2c_transaction_delay
& 0xf);
279 buf
[idx
] = (req
->u
.i2c_read
.read_i2c_device_id
) & 0x7f;
281 buf
[idx
] = (req
->u
.i2c_read
.num_bytes_read
);
285 case DP_REMOTE_I2C_WRITE
:
286 buf
[idx
] = (req
->u
.i2c_write
.port_number
& 0xf) << 4;
288 buf
[idx
] = (req
->u
.i2c_write
.write_i2c_device_id
) & 0x7f;
290 buf
[idx
] = (req
->u
.i2c_write
.num_bytes
);
292 memcpy(&buf
[idx
], req
->u
.i2c_write
.bytes
, req
->u
.i2c_write
.num_bytes
);
293 idx
+= req
->u
.i2c_write
.num_bytes
;
299 static void drm_dp_crc_sideband_chunk_req(u8
*msg
, u8 len
)
302 crc4
= drm_dp_msg_data_crc4(msg
, len
);
306 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body
*rep
,
307 struct drm_dp_sideband_msg_tx
*raw
)
312 buf
[idx
++] = (rep
->reply_type
& 0x1) << 7 | (rep
->req_type
& 0x7f);
317 /* this adds a chunk of msg to the builder to get the final msg */
318 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx
*msg
,
319 u8
*replybuf
, u8 replybuflen
, bool hdr
)
326 struct drm_dp_sideband_msg_hdr recv_hdr
;
327 ret
= drm_dp_decode_sideband_msg_hdr(&recv_hdr
, replybuf
, replybuflen
, &hdrlen
);
329 print_hex_dump(KERN_DEBUG
, "failed hdr", DUMP_PREFIX_NONE
, 16, 1, replybuf
, replybuflen
, false);
333 /* get length contained in this portion */
334 msg
->curchunk_len
= recv_hdr
.msg_len
;
335 msg
->curchunk_hdrlen
= hdrlen
;
337 /* we have already gotten an somt - don't bother parsing */
338 if (recv_hdr
.somt
&& msg
->have_somt
)
342 memcpy(&msg
->initial_hdr
, &recv_hdr
, sizeof(struct drm_dp_sideband_msg_hdr
));
343 msg
->have_somt
= true;
346 msg
->have_eomt
= true;
348 /* copy the bytes for the remainder of this header chunk */
349 msg
->curchunk_idx
= min(msg
->curchunk_len
, (u8
)(replybuflen
- hdrlen
));
350 memcpy(&msg
->chunk
[0], replybuf
+ hdrlen
, msg
->curchunk_idx
);
352 memcpy(&msg
->chunk
[msg
->curchunk_idx
], replybuf
, replybuflen
);
353 msg
->curchunk_idx
+= replybuflen
;
356 if (msg
->curchunk_idx
>= msg
->curchunk_len
) {
358 crc4
= drm_dp_msg_data_crc4(msg
->chunk
, msg
->curchunk_len
- 1);
359 /* copy chunk into bigger msg */
360 memcpy(&msg
->msg
[msg
->curlen
], msg
->chunk
, msg
->curchunk_len
- 1);
361 msg
->curlen
+= msg
->curchunk_len
- 1;
366 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx
*raw
,
367 struct drm_dp_sideband_msg_reply_body
*repmsg
)
371 memcpy(repmsg
->u
.link_addr
.guid
, &raw
->msg
[idx
], 16);
373 repmsg
->u
.link_addr
.nports
= raw
->msg
[idx
] & 0xf;
375 if (idx
> raw
->curlen
)
377 for (i
= 0; i
< repmsg
->u
.link_addr
.nports
; i
++) {
378 if (raw
->msg
[idx
] & 0x80)
379 repmsg
->u
.link_addr
.ports
[i
].input_port
= 1;
381 repmsg
->u
.link_addr
.ports
[i
].peer_device_type
= (raw
->msg
[idx
] >> 4) & 0x7;
382 repmsg
->u
.link_addr
.ports
[i
].port_number
= (raw
->msg
[idx
] & 0xf);
385 if (idx
> raw
->curlen
)
387 repmsg
->u
.link_addr
.ports
[i
].mcs
= (raw
->msg
[idx
] >> 7) & 0x1;
388 repmsg
->u
.link_addr
.ports
[i
].ddps
= (raw
->msg
[idx
] >> 6) & 0x1;
389 if (repmsg
->u
.link_addr
.ports
[i
].input_port
== 0)
390 repmsg
->u
.link_addr
.ports
[i
].legacy_device_plug_status
= (raw
->msg
[idx
] >> 5) & 0x1;
392 if (idx
> raw
->curlen
)
394 if (repmsg
->u
.link_addr
.ports
[i
].input_port
== 0) {
395 repmsg
->u
.link_addr
.ports
[i
].dpcd_revision
= (raw
->msg
[idx
]);
397 if (idx
> raw
->curlen
)
399 memcpy(repmsg
->u
.link_addr
.ports
[i
].peer_guid
, &raw
->msg
[idx
], 16);
401 if (idx
> raw
->curlen
)
403 repmsg
->u
.link_addr
.ports
[i
].num_sdp_streams
= (raw
->msg
[idx
] >> 4) & 0xf;
404 repmsg
->u
.link_addr
.ports
[i
].num_sdp_stream_sinks
= (raw
->msg
[idx
] & 0xf);
408 if (idx
> raw
->curlen
)
414 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx
, raw
->curlen
);
418 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx
*raw
,
419 struct drm_dp_sideband_msg_reply_body
*repmsg
)
422 repmsg
->u
.remote_dpcd_read_ack
.port_number
= raw
->msg
[idx
] & 0xf;
424 if (idx
> raw
->curlen
)
426 repmsg
->u
.remote_dpcd_read_ack
.num_bytes
= raw
->msg
[idx
];
427 if (idx
> raw
->curlen
)
430 memcpy(repmsg
->u
.remote_dpcd_read_ack
.bytes
, &raw
->msg
[idx
], repmsg
->u
.remote_dpcd_read_ack
.num_bytes
);
433 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx
, raw
->curlen
);
437 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx
*raw
,
438 struct drm_dp_sideband_msg_reply_body
*repmsg
)
441 repmsg
->u
.remote_dpcd_write_ack
.port_number
= raw
->msg
[idx
] & 0xf;
443 if (idx
> raw
->curlen
)
447 DRM_DEBUG_KMS("parse length fail %d %d\n", idx
, raw
->curlen
);
451 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx
*raw
,
452 struct drm_dp_sideband_msg_reply_body
*repmsg
)
456 repmsg
->u
.remote_i2c_read_ack
.port_number
= (raw
->msg
[idx
] & 0xf);
458 if (idx
> raw
->curlen
)
460 repmsg
->u
.remote_i2c_read_ack
.num_bytes
= raw
->msg
[idx
];
463 memcpy(repmsg
->u
.remote_i2c_read_ack
.bytes
, &raw
->msg
[idx
], repmsg
->u
.remote_i2c_read_ack
.num_bytes
);
466 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx
, raw
->curlen
);
470 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx
*raw
,
471 struct drm_dp_sideband_msg_reply_body
*repmsg
)
474 repmsg
->u
.path_resources
.port_number
= (raw
->msg
[idx
] >> 4) & 0xf;
476 if (idx
> raw
->curlen
)
478 repmsg
->u
.path_resources
.full_payload_bw_number
= (raw
->msg
[idx
] << 8) | (raw
->msg
[idx
+1]);
480 if (idx
> raw
->curlen
)
482 repmsg
->u
.path_resources
.avail_payload_bw_number
= (raw
->msg
[idx
] << 8) | (raw
->msg
[idx
+1]);
484 if (idx
> raw
->curlen
)
488 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx
, raw
->curlen
);
492 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx
*raw
,
493 struct drm_dp_sideband_msg_reply_body
*repmsg
)
496 repmsg
->u
.allocate_payload
.port_number
= (raw
->msg
[idx
] >> 4) & 0xf;
498 if (idx
> raw
->curlen
)
500 repmsg
->u
.allocate_payload
.vcpi
= raw
->msg
[idx
];
502 if (idx
> raw
->curlen
)
504 repmsg
->u
.allocate_payload
.allocated_pbn
= (raw
->msg
[idx
] << 8) | (raw
->msg
[idx
+1]);
506 if (idx
> raw
->curlen
)
510 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx
, raw
->curlen
);
514 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx
*raw
,
515 struct drm_dp_sideband_msg_reply_body
*repmsg
)
518 repmsg
->u
.query_payload
.port_number
= (raw
->msg
[idx
] >> 4) & 0xf;
520 if (idx
> raw
->curlen
)
522 repmsg
->u
.query_payload
.allocated_pbn
= (raw
->msg
[idx
] << 8) | (raw
->msg
[idx
+ 1]);
524 if (idx
> raw
->curlen
)
528 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx
, raw
->curlen
);
532 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx
*raw
,
533 struct drm_dp_sideband_msg_reply_body
*msg
)
535 memset(msg
, 0, sizeof(*msg
));
536 msg
->reply_type
= (raw
->msg
[0] & 0x80) >> 7;
537 msg
->req_type
= (raw
->msg
[0] & 0x7f);
539 if (msg
->reply_type
) {
540 memcpy(msg
->u
.nak
.guid
, &raw
->msg
[1], 16);
541 msg
->u
.nak
.reason
= raw
->msg
[17];
542 msg
->u
.nak
.nak_data
= raw
->msg
[18];
546 switch (msg
->req_type
) {
547 case DP_LINK_ADDRESS
:
548 return drm_dp_sideband_parse_link_address(raw
, msg
);
549 case DP_QUERY_PAYLOAD
:
550 return drm_dp_sideband_parse_query_payload_ack(raw
, msg
);
551 case DP_REMOTE_DPCD_READ
:
552 return drm_dp_sideband_parse_remote_dpcd_read(raw
, msg
);
553 case DP_REMOTE_DPCD_WRITE
:
554 return drm_dp_sideband_parse_remote_dpcd_write(raw
, msg
);
555 case DP_REMOTE_I2C_READ
:
556 return drm_dp_sideband_parse_remote_i2c_read_ack(raw
, msg
);
557 case DP_ENUM_PATH_RESOURCES
:
558 return drm_dp_sideband_parse_enum_path_resources_ack(raw
, msg
);
559 case DP_ALLOCATE_PAYLOAD
:
560 return drm_dp_sideband_parse_allocate_payload_ack(raw
, msg
);
562 DRM_ERROR("Got unknown reply 0x%02x\n", msg
->req_type
);
567 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx
*raw
,
568 struct drm_dp_sideband_msg_req_body
*msg
)
572 msg
->u
.conn_stat
.port_number
= (raw
->msg
[idx
] & 0xf0) >> 4;
574 if (idx
> raw
->curlen
)
577 memcpy(msg
->u
.conn_stat
.guid
, &raw
->msg
[idx
], 16);
579 if (idx
> raw
->curlen
)
582 msg
->u
.conn_stat
.legacy_device_plug_status
= (raw
->msg
[idx
] >> 6) & 0x1;
583 msg
->u
.conn_stat
.displayport_device_plug_status
= (raw
->msg
[idx
] >> 5) & 0x1;
584 msg
->u
.conn_stat
.message_capability_status
= (raw
->msg
[idx
] >> 4) & 0x1;
585 msg
->u
.conn_stat
.input_port
= (raw
->msg
[idx
] >> 3) & 0x1;
586 msg
->u
.conn_stat
.peer_device_type
= (raw
->msg
[idx
] & 0x7);
590 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx
, raw
->curlen
);
594 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx
*raw
,
595 struct drm_dp_sideband_msg_req_body
*msg
)
599 msg
->u
.resource_stat
.port_number
= (raw
->msg
[idx
] & 0xf0) >> 4;
601 if (idx
> raw
->curlen
)
604 memcpy(msg
->u
.resource_stat
.guid
, &raw
->msg
[idx
], 16);
606 if (idx
> raw
->curlen
)
609 msg
->u
.resource_stat
.available_pbn
= (raw
->msg
[idx
] << 8) | (raw
->msg
[idx
+ 1]);
613 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx
, raw
->curlen
);
617 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx
*raw
,
618 struct drm_dp_sideband_msg_req_body
*msg
)
620 memset(msg
, 0, sizeof(*msg
));
621 msg
->req_type
= (raw
->msg
[0] & 0x7f);
623 switch (msg
->req_type
) {
624 case DP_CONNECTION_STATUS_NOTIFY
:
625 return drm_dp_sideband_parse_connection_status_notify(raw
, msg
);
626 case DP_RESOURCE_STATUS_NOTIFY
:
627 return drm_dp_sideband_parse_resource_status_notify(raw
, msg
);
629 DRM_ERROR("Got unknown request 0x%02x\n", msg
->req_type
);
634 static int build_dpcd_write(struct drm_dp_sideband_msg_tx
*msg
, u8 port_num
, u32 offset
, u8 num_bytes
, u8
*bytes
)
636 struct drm_dp_sideband_msg_req_body req
;
638 req
.req_type
= DP_REMOTE_DPCD_WRITE
;
639 req
.u
.dpcd_write
.port_number
= port_num
;
640 req
.u
.dpcd_write
.dpcd_address
= offset
;
641 req
.u
.dpcd_write
.num_bytes
= num_bytes
;
642 req
.u
.dpcd_write
.bytes
= bytes
;
643 drm_dp_encode_sideband_req(&req
, msg
);
648 static int build_link_address(struct drm_dp_sideband_msg_tx
*msg
)
650 struct drm_dp_sideband_msg_req_body req
;
652 req
.req_type
= DP_LINK_ADDRESS
;
653 drm_dp_encode_sideband_req(&req
, msg
);
657 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx
*msg
, int port_num
)
659 struct drm_dp_sideband_msg_req_body req
;
661 req
.req_type
= DP_ENUM_PATH_RESOURCES
;
662 req
.u
.port_num
.port_number
= port_num
;
663 drm_dp_encode_sideband_req(&req
, msg
);
664 msg
->path_msg
= true;
668 static int build_allocate_payload(struct drm_dp_sideband_msg_tx
*msg
, int port_num
,
669 u8 vcpi
, uint16_t pbn
)
671 struct drm_dp_sideband_msg_req_body req
;
672 memset(&req
, 0, sizeof(req
));
673 req
.req_type
= DP_ALLOCATE_PAYLOAD
;
674 req
.u
.allocate_payload
.port_number
= port_num
;
675 req
.u
.allocate_payload
.vcpi
= vcpi
;
676 req
.u
.allocate_payload
.pbn
= pbn
;
677 drm_dp_encode_sideband_req(&req
, msg
);
678 msg
->path_msg
= true;
682 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr
*mgr
,
683 struct drm_dp_vcpi
*vcpi
)
687 mutex_lock(&mgr
->payload_lock
);
688 ret
= find_first_zero_bit(&mgr
->payload_mask
, mgr
->max_payloads
+ 1);
689 if (ret
> mgr
->max_payloads
) {
691 DRM_DEBUG_KMS("out of payload ids %d\n", ret
);
695 vcpi_ret
= find_first_zero_bit(&mgr
->vcpi_mask
, mgr
->max_payloads
+ 1);
696 if (vcpi_ret
> mgr
->max_payloads
) {
698 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret
);
702 set_bit(ret
, &mgr
->payload_mask
);
703 set_bit(vcpi_ret
, &mgr
->vcpi_mask
);
704 vcpi
->vcpi
= vcpi_ret
+ 1;
705 mgr
->proposed_vcpis
[ret
- 1] = vcpi
;
707 mutex_unlock(&mgr
->payload_lock
);
711 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr
*mgr
,
718 mutex_lock(&mgr
->payload_lock
);
719 DRM_DEBUG_KMS("putting payload %d\n", vcpi
);
720 clear_bit(vcpi
- 1, &mgr
->vcpi_mask
);
722 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
723 if (mgr
->proposed_vcpis
[i
])
724 if (mgr
->proposed_vcpis
[i
]->vcpi
== vcpi
) {
725 mgr
->proposed_vcpis
[i
] = NULL
;
726 clear_bit(i
+ 1, &mgr
->payload_mask
);
729 mutex_unlock(&mgr
->payload_lock
);
732 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr
*mgr
,
733 struct drm_dp_sideband_msg_tx
*txmsg
)
738 * All updates to txmsg->state are protected by mgr->qlock, and the two
739 * cases we check here are terminal states. For those the barriers
740 * provided by the wake_up/wait_event pair are enough.
742 ret
= (txmsg
->state
== DRM_DP_SIDEBAND_TX_RX
||
743 txmsg
->state
== DRM_DP_SIDEBAND_TX_TIMEOUT
);
747 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch
*mstb
,
748 struct drm_dp_sideband_msg_tx
*txmsg
)
750 struct drm_dp_mst_topology_mgr
*mgr
= mstb
->mgr
;
753 ret
= wait_event_timeout(mgr
->tx_waitq
,
754 check_txmsg_state(mgr
, txmsg
),
756 mutex_lock(&mstb
->mgr
->qlock
);
758 if (txmsg
->state
== DRM_DP_SIDEBAND_TX_TIMEOUT
) {
763 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg
, txmsg
->state
, txmsg
->seqno
);
765 /* dump some state */
769 if (txmsg
->state
== DRM_DP_SIDEBAND_TX_QUEUED
||
770 txmsg
->state
== DRM_DP_SIDEBAND_TX_START_SEND
) {
771 list_del(&txmsg
->next
);
774 if (txmsg
->state
== DRM_DP_SIDEBAND_TX_START_SEND
||
775 txmsg
->state
== DRM_DP_SIDEBAND_TX_SENT
) {
776 mstb
->tx_slots
[txmsg
->seqno
] = NULL
;
780 mutex_unlock(&mgr
->qlock
);
785 static struct drm_dp_mst_branch
*drm_dp_add_mst_branch_device(u8 lct
, u8
*rad
)
787 struct drm_dp_mst_branch
*mstb
;
789 mstb
= kzalloc(sizeof(*mstb
), GFP_KERNEL
);
795 memcpy(mstb
->rad
, rad
, lct
/ 2);
796 INIT_LIST_HEAD(&mstb
->ports
);
797 kref_init(&mstb
->kref
);
801 static void drm_dp_destroy_mst_branch_device(struct kref
*kref
)
803 struct drm_dp_mst_branch
*mstb
= container_of(kref
, struct drm_dp_mst_branch
, kref
);
804 struct drm_dp_mst_port
*port
, *tmp
;
805 bool wake_tx
= false;
807 cancel_work_sync(&mstb
->mgr
->work
);
810 * destroy all ports - don't need lock
811 * as there are no more references to the mst branch
812 * device at this point.
814 list_for_each_entry_safe(port
, tmp
, &mstb
->ports
, next
) {
815 list_del(&port
->next
);
816 drm_dp_put_port(port
);
819 /* drop any tx slots msg */
820 mutex_lock(&mstb
->mgr
->qlock
);
821 if (mstb
->tx_slots
[0]) {
822 mstb
->tx_slots
[0]->state
= DRM_DP_SIDEBAND_TX_TIMEOUT
;
823 mstb
->tx_slots
[0] = NULL
;
826 if (mstb
->tx_slots
[1]) {
827 mstb
->tx_slots
[1]->state
= DRM_DP_SIDEBAND_TX_TIMEOUT
;
828 mstb
->tx_slots
[1] = NULL
;
831 mutex_unlock(&mstb
->mgr
->qlock
);
834 wake_up(&mstb
->mgr
->tx_waitq
);
838 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch
*mstb
)
840 kref_put(&mstb
->kref
, drm_dp_destroy_mst_branch_device
);
844 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port
*port
, int old_pdt
)
846 struct drm_dp_mst_branch
*mstb
;
849 case DP_PEER_DEVICE_DP_LEGACY_CONV
:
850 case DP_PEER_DEVICE_SST_SINK
:
851 /* remove i2c over sideband */
852 drm_dp_mst_unregister_i2c_bus(&port
->aux
);
854 case DP_PEER_DEVICE_MST_BRANCHING
:
857 drm_dp_put_mst_branch_device(mstb
);
862 static void drm_dp_destroy_port(struct kref
*kref
)
864 struct drm_dp_mst_port
*port
= container_of(kref
, struct drm_dp_mst_port
, kref
);
865 struct drm_dp_mst_topology_mgr
*mgr
= port
->mgr
;
868 port
->vcpi
.num_slots
= 0;
870 kfree(port
->cached_edid
);
873 * The only time we don't have a connector
874 * on an output port is if the connector init
877 if (port
->connector
) {
878 /* we can't destroy the connector here, as
879 * we might be holding the mode_config.mutex
880 * from an EDID retrieval */
882 mutex_lock(&mgr
->destroy_connector_lock
);
883 list_add(&port
->next
, &mgr
->destroy_connector_list
);
884 mutex_unlock(&mgr
->destroy_connector_lock
);
885 schedule_work(&mgr
->destroy_connector_work
);
888 /* no need to clean up vcpi
889 * as if we have no connector we never setup a vcpi */
890 drm_dp_port_teardown_pdt(port
, port
->pdt
);
895 static void drm_dp_put_port(struct drm_dp_mst_port
*port
)
897 kref_put(&port
->kref
, drm_dp_destroy_port
);
900 static struct drm_dp_mst_branch
*drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch
*mstb
, struct drm_dp_mst_branch
*to_find
)
902 struct drm_dp_mst_port
*port
;
903 struct drm_dp_mst_branch
*rmstb
;
904 if (to_find
== mstb
) {
905 kref_get(&mstb
->kref
);
908 list_for_each_entry(port
, &mstb
->ports
, next
) {
910 rmstb
= drm_dp_mst_get_validated_mstb_ref_locked(port
->mstb
, to_find
);
918 static struct drm_dp_mst_branch
*drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_branch
*mstb
)
920 struct drm_dp_mst_branch
*rmstb
= NULL
;
921 mutex_lock(&mgr
->lock
);
922 if (mgr
->mst_primary
)
923 rmstb
= drm_dp_mst_get_validated_mstb_ref_locked(mgr
->mst_primary
, mstb
);
924 mutex_unlock(&mgr
->lock
);
928 static struct drm_dp_mst_port
*drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch
*mstb
, struct drm_dp_mst_port
*to_find
)
930 struct drm_dp_mst_port
*port
, *mport
;
932 list_for_each_entry(port
, &mstb
->ports
, next
) {
933 if (port
== to_find
) {
934 kref_get(&port
->kref
);
938 mport
= drm_dp_mst_get_port_ref_locked(port
->mstb
, to_find
);
946 static struct drm_dp_mst_port
*drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
948 struct drm_dp_mst_port
*rport
= NULL
;
949 mutex_lock(&mgr
->lock
);
950 if (mgr
->mst_primary
)
951 rport
= drm_dp_mst_get_port_ref_locked(mgr
->mst_primary
, port
);
952 mutex_unlock(&mgr
->lock
);
956 static struct drm_dp_mst_port
*drm_dp_get_port(struct drm_dp_mst_branch
*mstb
, u8 port_num
)
958 struct drm_dp_mst_port
*port
;
960 list_for_each_entry(port
, &mstb
->ports
, next
) {
961 if (port
->port_num
== port_num
) {
962 kref_get(&port
->kref
);
971 * calculate a new RAD for this MST branch device
972 * if parent has an LCT of 2 then it has 1 nibble of RAD,
973 * if parent has an LCT of 3 then it has 2 nibbles of RAD,
975 static u8
drm_dp_calculate_rad(struct drm_dp_mst_port
*port
,
978 int lct
= port
->parent
->lct
;
982 memcpy(rad
, port
->parent
->rad
, idx
);
983 shift
= (lct
% 2) ? 4 : 0;
987 rad
[idx
] |= port
->port_num
<< shift
;
992 * return sends link address for new mstb
994 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port
*port
)
998 bool send_link
= false;
1000 case DP_PEER_DEVICE_DP_LEGACY_CONV
:
1001 case DP_PEER_DEVICE_SST_SINK
:
1002 /* add i2c over sideband */
1003 ret
= drm_dp_mst_register_i2c_bus(&port
->aux
);
1005 case DP_PEER_DEVICE_MST_BRANCHING
:
1006 lct
= drm_dp_calculate_rad(port
, rad
);
1008 port
->mstb
= drm_dp_add_mst_branch_device(lct
, rad
);
1009 port
->mstb
->mgr
= port
->mgr
;
1010 port
->mstb
->port_parent
= port
;
1018 static void drm_dp_check_port_guid(struct drm_dp_mst_branch
*mstb
,
1019 struct drm_dp_mst_port
*port
)
1022 if (port
->dpcd_rev
>= 0x12) {
1023 port
->guid_valid
= drm_dp_validate_guid(mstb
->mgr
, port
->guid
);
1024 if (!port
->guid_valid
) {
1025 ret
= drm_dp_send_dpcd_write(mstb
->mgr
,
1029 port
->guid_valid
= true;
1034 static void build_mst_prop_path(const struct drm_dp_mst_branch
*mstb
,
1037 size_t proppath_size
)
1041 snprintf(proppath
, proppath_size
, "mst:%d", mstb
->mgr
->conn_base_id
);
1042 for (i
= 0; i
< (mstb
->lct
- 1); i
++) {
1043 int shift
= (i
% 2) ? 0 : 4;
1044 int port_num
= mstb
->rad
[i
/ 2] >> shift
;
1045 snprintf(temp
, sizeof(temp
), "-%d", port_num
);
1046 strlcat(proppath
, temp
, proppath_size
);
1048 snprintf(temp
, sizeof(temp
), "-%d", pnum
);
1049 strlcat(proppath
, temp
, proppath_size
);
1052 static void drm_dp_add_port(struct drm_dp_mst_branch
*mstb
,
1054 struct drm_dp_link_addr_reply_port
*port_msg
)
1056 struct drm_dp_mst_port
*port
;
1058 bool created
= false;
1061 port
= drm_dp_get_port(mstb
, port_msg
->port_number
);
1063 port
= kzalloc(sizeof(*port
), GFP_KERNEL
);
1066 kref_init(&port
->kref
);
1067 port
->parent
= mstb
;
1068 port
->port_num
= port_msg
->port_number
;
1069 port
->mgr
= mstb
->mgr
;
1070 port
->aux
.name
= "DPMST";
1071 port
->aux
.dev
= dev
;
1074 old_pdt
= port
->pdt
;
1075 old_ddps
= port
->ddps
;
1078 port
->pdt
= port_msg
->peer_device_type
;
1079 port
->input
= port_msg
->input_port
;
1080 port
->mcs
= port_msg
->mcs
;
1081 port
->ddps
= port_msg
->ddps
;
1082 port
->ldps
= port_msg
->legacy_device_plug_status
;
1083 port
->dpcd_rev
= port_msg
->dpcd_revision
;
1084 port
->num_sdp_streams
= port_msg
->num_sdp_streams
;
1085 port
->num_sdp_stream_sinks
= port_msg
->num_sdp_stream_sinks
;
1086 memcpy(port
->guid
, port_msg
->peer_guid
, 16);
1088 /* manage mstb port lists with mgr lock - take a reference
1091 mutex_lock(&mstb
->mgr
->lock
);
1092 kref_get(&port
->kref
);
1093 list_add(&port
->next
, &mstb
->ports
);
1094 mutex_unlock(&mstb
->mgr
->lock
);
1097 if (old_ddps
!= port
->ddps
) {
1099 drm_dp_check_port_guid(mstb
, port
);
1101 drm_dp_send_enum_path_resources(mstb
->mgr
, mstb
, port
);
1103 port
->guid_valid
= false;
1104 port
->available_pbn
= 0;
1108 if (old_pdt
!= port
->pdt
&& !port
->input
) {
1109 drm_dp_port_teardown_pdt(port
, old_pdt
);
1111 ret
= drm_dp_port_setup_pdt(port
);
1113 drm_dp_send_link_address(mstb
->mgr
, port
->mstb
);
1116 if (created
&& !port
->input
) {
1119 build_mst_prop_path(mstb
, port
->port_num
, proppath
, sizeof(proppath
));
1120 port
->connector
= (*mstb
->mgr
->cbs
->add_connector
)(mstb
->mgr
, port
, proppath
);
1121 if (!port
->connector
) {
1122 /* remove it from the port list */
1123 mutex_lock(&mstb
->mgr
->lock
);
1124 list_del(&port
->next
);
1125 mutex_unlock(&mstb
->mgr
->lock
);
1126 /* drop port list reference */
1127 drm_dp_put_port(port
);
1130 if (port
->port_num
>= 8) {
1131 port
->cached_edid
= drm_get_edid(port
->connector
, &port
->aux
.ddc
);
1132 drm_mode_connector_set_tile_property(port
->connector
);
1134 (*mstb
->mgr
->cbs
->register_connector
)(port
->connector
);
1138 /* put reference to this port */
1139 drm_dp_put_port(port
);
1142 static void drm_dp_update_port(struct drm_dp_mst_branch
*mstb
,
1143 struct drm_dp_connection_status_notify
*conn_stat
)
1145 struct drm_dp_mst_port
*port
;
1148 bool dowork
= false;
1149 port
= drm_dp_get_port(mstb
, conn_stat
->port_number
);
1153 old_ddps
= port
->ddps
;
1154 old_pdt
= port
->pdt
;
1155 port
->pdt
= conn_stat
->peer_device_type
;
1156 port
->mcs
= conn_stat
->message_capability_status
;
1157 port
->ldps
= conn_stat
->legacy_device_plug_status
;
1158 port
->ddps
= conn_stat
->displayport_device_plug_status
;
1160 if (old_ddps
!= port
->ddps
) {
1162 drm_dp_check_port_guid(mstb
, port
);
1165 port
->guid_valid
= false;
1166 port
->available_pbn
= 0;
1169 if (old_pdt
!= port
->pdt
&& !port
->input
) {
1170 drm_dp_port_teardown_pdt(port
, old_pdt
);
1172 if (drm_dp_port_setup_pdt(port
))
1176 drm_dp_put_port(port
);
1178 queue_work(system_long_wq
, &mstb
->mgr
->work
);
1182 static struct drm_dp_mst_branch
*drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr
*mgr
,
1185 struct drm_dp_mst_branch
*mstb
;
1186 struct drm_dp_mst_port
*port
;
1188 /* find the port by iterating down */
1190 mutex_lock(&mgr
->lock
);
1191 mstb
= mgr
->mst_primary
;
1193 for (i
= 0; i
< lct
- 1; i
++) {
1194 int shift
= (i
% 2) ? 0 : 4;
1195 int port_num
= rad
[i
/ 2] >> shift
;
1197 list_for_each_entry(port
, &mstb
->ports
, next
) {
1198 if (port
->port_num
== port_num
) {
1200 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct
, rad
[0]);
1209 kref_get(&mstb
->kref
);
1210 mutex_unlock(&mgr
->lock
);
1214 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr
*mgr
,
1215 struct drm_dp_mst_branch
*mstb
)
1217 struct drm_dp_mst_port
*port
;
1218 struct drm_dp_mst_branch
*mstb_child
;
1219 if (!mstb
->link_address_sent
)
1220 drm_dp_send_link_address(mgr
, mstb
);
1222 list_for_each_entry(port
, &mstb
->ports
, next
) {
1229 if (!port
->available_pbn
)
1230 drm_dp_send_enum_path_resources(mgr
, mstb
, port
);
1233 mstb_child
= drm_dp_get_validated_mstb_ref(mgr
, port
->mstb
);
1235 drm_dp_check_and_send_link_address(mgr
, mstb_child
);
1236 drm_dp_put_mst_branch_device(mstb_child
);
1242 static void drm_dp_mst_link_probe_work(struct work_struct
*work
)
1244 struct drm_dp_mst_topology_mgr
*mgr
= container_of(work
, struct drm_dp_mst_topology_mgr
, work
);
1245 struct drm_dp_mst_branch
*mstb
;
1247 mutex_lock(&mgr
->lock
);
1248 mstb
= mgr
->mst_primary
;
1250 kref_get(&mstb
->kref
);
1252 mutex_unlock(&mgr
->lock
);
1254 drm_dp_check_and_send_link_address(mgr
, mstb
);
1255 drm_dp_put_mst_branch_device(mstb
);
1259 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr
*mgr
,
1262 static u8 zero_guid
[16];
1264 if (!memcmp(guid
, zero_guid
, 16)) {
1265 u64 salt
= get_jiffies_64();
1266 memcpy(&guid
[0], &salt
, sizeof(u64
));
1267 memcpy(&guid
[8], &salt
, sizeof(u64
));
1274 static int build_dpcd_read(struct drm_dp_sideband_msg_tx
*msg
, u8 port_num
, u32 offset
, u8 num_bytes
)
1276 struct drm_dp_sideband_msg_req_body req
;
1278 req
.req_type
= DP_REMOTE_DPCD_READ
;
1279 req
.u
.dpcd_read
.port_number
= port_num
;
1280 req
.u
.dpcd_read
.dpcd_address
= offset
;
1281 req
.u
.dpcd_read
.num_bytes
= num_bytes
;
1282 drm_dp_encode_sideband_req(&req
, msg
);
1288 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr
*mgr
,
1289 bool up
, u8
*msg
, int len
)
1292 int regbase
= up
? DP_SIDEBAND_MSG_UP_REP_BASE
: DP_SIDEBAND_MSG_DOWN_REQ_BASE
;
1293 int tosend
, total
, offset
;
1300 tosend
= min3(mgr
->max_dpcd_transaction_bytes
, 16, total
);
1302 ret
= drm_dp_dpcd_write(mgr
->aux
, regbase
+ offset
,
1305 if (ret
!= tosend
) {
1306 if (ret
== -EIO
&& retries
< 5) {
1310 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend
, ret
);
1316 } while (total
> 0);
1320 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr
*hdr
,
1321 struct drm_dp_sideband_msg_tx
*txmsg
)
1323 struct drm_dp_mst_branch
*mstb
= txmsg
->dst
;
1325 /* both msg slots are full */
1326 if (txmsg
->seqno
== -1) {
1327 if (mstb
->tx_slots
[0] && mstb
->tx_slots
[1]) {
1328 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__
);
1331 if (mstb
->tx_slots
[0] == NULL
&& mstb
->tx_slots
[1] == NULL
) {
1332 txmsg
->seqno
= mstb
->last_seqno
;
1333 mstb
->last_seqno
^= 1;
1334 } else if (mstb
->tx_slots
[0] == NULL
)
1338 mstb
->tx_slots
[txmsg
->seqno
] = txmsg
;
1341 hdr
->path_msg
= txmsg
->path_msg
;
1342 hdr
->lct
= mstb
->lct
;
1343 hdr
->lcr
= mstb
->lct
- 1;
1345 memcpy(hdr
->rad
, mstb
->rad
, mstb
->lct
/ 2);
1346 hdr
->seqno
= txmsg
->seqno
;
1350 * process a single block of the next message in the sideband queue
1352 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr
*mgr
,
1353 struct drm_dp_sideband_msg_tx
*txmsg
,
1357 struct drm_dp_sideband_msg_hdr hdr
;
1358 int len
, space
, idx
, tosend
;
1361 memset(&hdr
, 0, sizeof(struct drm_dp_sideband_msg_hdr
));
1363 if (txmsg
->state
== DRM_DP_SIDEBAND_TX_QUEUED
) {
1365 txmsg
->state
= DRM_DP_SIDEBAND_TX_START_SEND
;
1368 /* make hdr from dst mst - for replies use seqno
1369 otherwise assign one */
1370 ret
= set_hdr_from_dst_qlock(&hdr
, txmsg
);
1374 /* amount left to send in this message */
1375 len
= txmsg
->cur_len
- txmsg
->cur_offset
;
1377 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
1378 space
= 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr
);
1380 tosend
= min(len
, space
);
1381 if (len
== txmsg
->cur_len
)
1387 hdr
.msg_len
= tosend
+ 1;
1388 drm_dp_encode_sideband_msg_hdr(&hdr
, chunk
, &idx
);
1389 memcpy(&chunk
[idx
], &txmsg
->msg
[txmsg
->cur_offset
], tosend
);
1390 /* add crc at end */
1391 drm_dp_crc_sideband_chunk_req(&chunk
[idx
], tosend
);
1394 ret
= drm_dp_send_sideband_msg(mgr
, up
, chunk
, idx
);
1396 DRM_DEBUG_KMS("sideband msg failed to send\n");
1400 txmsg
->cur_offset
+= tosend
;
1401 if (txmsg
->cur_offset
== txmsg
->cur_len
) {
1402 txmsg
->state
= DRM_DP_SIDEBAND_TX_SENT
;
1408 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr
*mgr
)
1410 struct drm_dp_sideband_msg_tx
*txmsg
;
1413 WARN_ON(!mutex_is_locked(&mgr
->qlock
));
1415 /* construct a chunk from the first msg in the tx_msg queue */
1416 if (list_empty(&mgr
->tx_msg_downq
)) {
1417 mgr
->tx_down_in_progress
= false;
1420 mgr
->tx_down_in_progress
= true;
1422 txmsg
= list_first_entry(&mgr
->tx_msg_downq
, struct drm_dp_sideband_msg_tx
, next
);
1423 ret
= process_single_tx_qlock(mgr
, txmsg
, false);
1425 /* txmsg is sent it should be in the slots now */
1426 list_del(&txmsg
->next
);
1428 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret
);
1429 list_del(&txmsg
->next
);
1430 if (txmsg
->seqno
!= -1)
1431 txmsg
->dst
->tx_slots
[txmsg
->seqno
] = NULL
;
1432 txmsg
->state
= DRM_DP_SIDEBAND_TX_TIMEOUT
;
1433 wake_up(&mgr
->tx_waitq
);
1435 if (list_empty(&mgr
->tx_msg_downq
)) {
1436 mgr
->tx_down_in_progress
= false;
1441 /* called holding qlock */
1442 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr
*mgr
)
1444 struct drm_dp_sideband_msg_tx
*txmsg
;
1447 /* construct a chunk from the first msg in the tx_msg queue */
1448 if (list_empty(&mgr
->tx_msg_upq
)) {
1449 mgr
->tx_up_in_progress
= false;
1453 txmsg
= list_first_entry(&mgr
->tx_msg_upq
, struct drm_dp_sideband_msg_tx
, next
);
1454 ret
= process_single_tx_qlock(mgr
, txmsg
, true);
1456 /* up txmsgs aren't put in slots - so free after we send it */
1457 list_del(&txmsg
->next
);
1460 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret
);
1461 mgr
->tx_up_in_progress
= true;
1464 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr
*mgr
,
1465 struct drm_dp_sideband_msg_tx
*txmsg
)
1467 mutex_lock(&mgr
->qlock
);
1468 list_add_tail(&txmsg
->next
, &mgr
->tx_msg_downq
);
1469 if (!mgr
->tx_down_in_progress
)
1470 process_single_down_tx_qlock(mgr
);
1471 mutex_unlock(&mgr
->qlock
);
1474 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr
*mgr
,
1475 struct drm_dp_mst_branch
*mstb
)
1478 struct drm_dp_sideband_msg_tx
*txmsg
;
1481 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1486 len
= build_link_address(txmsg
);
1488 mstb
->link_address_sent
= true;
1489 drm_dp_queue_down_tx(mgr
, txmsg
);
1491 ret
= drm_dp_mst_wait_tx_reply(mstb
, txmsg
);
1495 if (txmsg
->reply
.reply_type
== 1)
1496 DRM_DEBUG_KMS("link address nak received\n");
1498 DRM_DEBUG_KMS("link address reply: %d\n", txmsg
->reply
.u
.link_addr
.nports
);
1499 for (i
= 0; i
< txmsg
->reply
.u
.link_addr
.nports
; i
++) {
1500 DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i
,
1501 txmsg
->reply
.u
.link_addr
.ports
[i
].input_port
,
1502 txmsg
->reply
.u
.link_addr
.ports
[i
].peer_device_type
,
1503 txmsg
->reply
.u
.link_addr
.ports
[i
].port_number
,
1504 txmsg
->reply
.u
.link_addr
.ports
[i
].dpcd_revision
,
1505 txmsg
->reply
.u
.link_addr
.ports
[i
].mcs
,
1506 txmsg
->reply
.u
.link_addr
.ports
[i
].ddps
,
1507 txmsg
->reply
.u
.link_addr
.ports
[i
].legacy_device_plug_status
,
1508 txmsg
->reply
.u
.link_addr
.ports
[i
].num_sdp_streams
,
1509 txmsg
->reply
.u
.link_addr
.ports
[i
].num_sdp_stream_sinks
);
1511 for (i
= 0; i
< txmsg
->reply
.u
.link_addr
.nports
; i
++) {
1512 drm_dp_add_port(mstb
, mgr
->dev
, &txmsg
->reply
.u
.link_addr
.ports
[i
]);
1514 (*mgr
->cbs
->hotplug
)(mgr
);
1517 mstb
->link_address_sent
= false;
1518 DRM_DEBUG_KMS("link address failed %d\n", ret
);
1524 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr
*mgr
,
1525 struct drm_dp_mst_branch
*mstb
,
1526 struct drm_dp_mst_port
*port
)
1529 struct drm_dp_sideband_msg_tx
*txmsg
;
1532 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1537 len
= build_enum_path_resources(txmsg
, port
->port_num
);
1539 drm_dp_queue_down_tx(mgr
, txmsg
);
1541 ret
= drm_dp_mst_wait_tx_reply(mstb
, txmsg
);
1543 if (txmsg
->reply
.reply_type
== 1)
1544 DRM_DEBUG_KMS("enum path resources nak received\n");
1546 if (port
->port_num
!= txmsg
->reply
.u
.path_resources
.port_number
)
1547 DRM_ERROR("got incorrect port in response\n");
1548 DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg
->reply
.u
.path_resources
.port_number
, txmsg
->reply
.u
.path_resources
.full_payload_bw_number
,
1549 txmsg
->reply
.u
.path_resources
.avail_payload_bw_number
);
1550 port
->available_pbn
= txmsg
->reply
.u
.path_resources
.avail_payload_bw_number
;
1558 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr
*mgr
,
1559 struct drm_dp_mst_port
*port
,
1563 struct drm_dp_sideband_msg_tx
*txmsg
;
1564 struct drm_dp_mst_branch
*mstb
;
1567 mstb
= drm_dp_get_validated_mstb_ref(mgr
, port
->parent
);
1571 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1578 len
= build_allocate_payload(txmsg
, port
->port_num
,
1582 drm_dp_queue_down_tx(mgr
, txmsg
);
1584 ret
= drm_dp_mst_wait_tx_reply(mstb
, txmsg
);
1586 if (txmsg
->reply
.reply_type
== 1) {
1593 drm_dp_put_mst_branch_device(mstb
);
1597 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr
*mgr
,
1599 struct drm_dp_payload
*payload
)
1603 ret
= drm_dp_dpcd_write_payload(mgr
, id
, payload
);
1605 payload
->payload_state
= 0;
1608 payload
->payload_state
= DP_PAYLOAD_LOCAL
;
1612 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr
*mgr
,
1613 struct drm_dp_mst_port
*port
,
1615 struct drm_dp_payload
*payload
)
1618 ret
= drm_dp_payload_send_msg(mgr
, port
, id
, port
->vcpi
.pbn
);
1621 payload
->payload_state
= DP_PAYLOAD_REMOTE
;
1625 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr
*mgr
,
1626 struct drm_dp_mst_port
*port
,
1628 struct drm_dp_payload
*payload
)
1630 DRM_DEBUG_KMS("\n");
1631 /* its okay for these to fail */
1633 drm_dp_payload_send_msg(mgr
, port
, id
, 0);
1636 drm_dp_dpcd_write_payload(mgr
, id
, payload
);
1637 payload
->payload_state
= DP_PAYLOAD_DELETE_LOCAL
;
1641 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr
*mgr
,
1643 struct drm_dp_payload
*payload
)
1645 payload
->payload_state
= 0;
1650 * drm_dp_update_payload_part1() - Execute payload update part 1
1651 * @mgr: manager to use.
1653 * This iterates over all proposed virtual channels, and tries to
1654 * allocate space in the link for them. For 0->slots transitions,
1655 * this step just writes the VCPI to the MST device. For slots->0
1656 * transitions, this writes the updated VCPIs and removes the
1657 * remote VC payloads.
1659 * after calling this the driver should generate ACT and payload
1662 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr
*mgr
)
1666 struct drm_dp_payload req_payload
;
1667 struct drm_dp_mst_port
*port
;
1669 mutex_lock(&mgr
->payload_lock
);
1670 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
1671 /* solve the current payloads - compare to the hw ones
1672 - update the hw view */
1673 req_payload
.start_slot
= cur_slots
;
1674 if (mgr
->proposed_vcpis
[i
]) {
1675 port
= container_of(mgr
->proposed_vcpis
[i
], struct drm_dp_mst_port
, vcpi
);
1676 req_payload
.num_slots
= mgr
->proposed_vcpis
[i
]->num_slots
;
1679 req_payload
.num_slots
= 0;
1682 if (mgr
->payloads
[i
].start_slot
!= req_payload
.start_slot
) {
1683 mgr
->payloads
[i
].start_slot
= req_payload
.start_slot
;
1685 /* work out what is required to happen with this payload */
1686 if (mgr
->payloads
[i
].num_slots
!= req_payload
.num_slots
) {
1688 /* need to push an update for this payload */
1689 if (req_payload
.num_slots
) {
1690 drm_dp_create_payload_step1(mgr
, mgr
->proposed_vcpis
[i
]->vcpi
, &req_payload
);
1691 mgr
->payloads
[i
].num_slots
= req_payload
.num_slots
;
1692 } else if (mgr
->payloads
[i
].num_slots
) {
1693 mgr
->payloads
[i
].num_slots
= 0;
1694 drm_dp_destroy_payload_step1(mgr
, port
, port
->vcpi
.vcpi
, &mgr
->payloads
[i
]);
1695 req_payload
.payload_state
= mgr
->payloads
[i
].payload_state
;
1696 mgr
->payloads
[i
].start_slot
= 0;
1698 mgr
->payloads
[i
].payload_state
= req_payload
.payload_state
;
1700 cur_slots
+= req_payload
.num_slots
;
1703 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
1704 if (mgr
->payloads
[i
].payload_state
== DP_PAYLOAD_DELETE_LOCAL
) {
1705 DRM_DEBUG_KMS("removing payload %d\n", i
);
1706 for (j
= i
; j
< mgr
->max_payloads
- 1; j
++) {
1707 memcpy(&mgr
->payloads
[j
], &mgr
->payloads
[j
+ 1], sizeof(struct drm_dp_payload
));
1708 mgr
->proposed_vcpis
[j
] = mgr
->proposed_vcpis
[j
+ 1];
1709 if (mgr
->proposed_vcpis
[j
] && mgr
->proposed_vcpis
[j
]->num_slots
) {
1710 set_bit(j
+ 1, &mgr
->payload_mask
);
1712 clear_bit(j
+ 1, &mgr
->payload_mask
);
1715 memset(&mgr
->payloads
[mgr
->max_payloads
- 1], 0, sizeof(struct drm_dp_payload
));
1716 mgr
->proposed_vcpis
[mgr
->max_payloads
- 1] = NULL
;
1717 clear_bit(mgr
->max_payloads
, &mgr
->payload_mask
);
1721 mutex_unlock(&mgr
->payload_lock
);
1725 EXPORT_SYMBOL(drm_dp_update_payload_part1
);
1728 * drm_dp_update_payload_part2() - Execute payload update part 2
1729 * @mgr: manager to use.
1731 * This iterates over all proposed virtual channels, and tries to
1732 * allocate space in the link for them. For 0->slots transitions,
1733 * this step writes the remote VC payload commands. For slots->0
1734 * this just resets some internal state.
1736 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr
*mgr
)
1738 struct drm_dp_mst_port
*port
;
1741 mutex_lock(&mgr
->payload_lock
);
1742 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
1744 if (!mgr
->proposed_vcpis
[i
])
1747 port
= container_of(mgr
->proposed_vcpis
[i
], struct drm_dp_mst_port
, vcpi
);
1749 DRM_DEBUG_KMS("payload %d %d\n", i
, mgr
->payloads
[i
].payload_state
);
1750 if (mgr
->payloads
[i
].payload_state
== DP_PAYLOAD_LOCAL
) {
1751 ret
= drm_dp_create_payload_step2(mgr
, port
, mgr
->proposed_vcpis
[i
]->vcpi
, &mgr
->payloads
[i
]);
1752 } else if (mgr
->payloads
[i
].payload_state
== DP_PAYLOAD_DELETE_LOCAL
) {
1753 ret
= drm_dp_destroy_payload_step2(mgr
, mgr
->proposed_vcpis
[i
]->vcpi
, &mgr
->payloads
[i
]);
1756 mutex_unlock(&mgr
->payload_lock
);
1760 mutex_unlock(&mgr
->payload_lock
);
1763 EXPORT_SYMBOL(drm_dp_update_payload_part2
);
1765 #if 0 /* unused as of yet */
1766 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr
*mgr
,
1767 struct drm_dp_mst_port
*port
,
1768 int offset
, int size
)
1771 struct drm_dp_sideband_msg_tx
*txmsg
;
1773 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1777 len
= build_dpcd_read(txmsg
, port
->port_num
, 0, 8);
1778 txmsg
->dst
= port
->parent
;
1780 drm_dp_queue_down_tx(mgr
, txmsg
);
1786 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr
*mgr
,
1787 struct drm_dp_mst_port
*port
,
1788 int offset
, int size
, u8
*bytes
)
1792 struct drm_dp_sideband_msg_tx
*txmsg
;
1793 struct drm_dp_mst_branch
*mstb
;
1795 mstb
= drm_dp_get_validated_mstb_ref(mgr
, port
->parent
);
1799 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1805 len
= build_dpcd_write(txmsg
, port
->port_num
, offset
, size
, bytes
);
1808 drm_dp_queue_down_tx(mgr
, txmsg
);
1810 ret
= drm_dp_mst_wait_tx_reply(mstb
, txmsg
);
1812 if (txmsg
->reply
.reply_type
== 1) {
1819 drm_dp_put_mst_branch_device(mstb
);
1823 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx
*msg
, u8 req_type
)
1825 struct drm_dp_sideband_msg_reply_body reply
;
1827 reply
.reply_type
= 1;
1828 reply
.req_type
= req_type
;
1829 drm_dp_encode_sideband_reply(&reply
, msg
);
1833 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr
*mgr
,
1834 struct drm_dp_mst_branch
*mstb
,
1835 int req_type
, int seqno
, bool broadcast
)
1837 struct drm_dp_sideband_msg_tx
*txmsg
;
1839 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
1844 txmsg
->seqno
= seqno
;
1845 drm_dp_encode_up_ack_reply(txmsg
, req_type
);
1847 mutex_lock(&mgr
->qlock
);
1848 list_add_tail(&txmsg
->next
, &mgr
->tx_msg_upq
);
1849 if (!mgr
->tx_up_in_progress
) {
1850 process_single_up_tx_qlock(mgr
);
1852 mutex_unlock(&mgr
->qlock
);
1856 static bool drm_dp_get_vc_payload_bw(int dp_link_bw
,
1860 switch (dp_link_bw
) {
1862 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
1863 dp_link_bw
, dp_link_count
);
1866 case DP_LINK_BW_1_62
:
1867 *out
= 3 * dp_link_count
;
1869 case DP_LINK_BW_2_7
:
1870 *out
= 5 * dp_link_count
;
1872 case DP_LINK_BW_5_4
:
1873 *out
= 10 * dp_link_count
;
1880 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
1881 * @mgr: manager to set state for
1882 * @mst_state: true to enable MST on this connector - false to disable.
1884 * This is called by the driver when it detects an MST capable device plugged
1885 * into a DP MST capable port, or when a DP MST capable device is unplugged.
1887 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr
*mgr
, bool mst_state
)
1890 struct drm_dp_mst_branch
*mstb
= NULL
;
1892 mutex_lock(&mgr
->lock
);
1893 if (mst_state
== mgr
->mst_state
)
1896 mgr
->mst_state
= mst_state
;
1897 /* set the device into MST mode */
1899 WARN_ON(mgr
->mst_primary
);
1902 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_DPCD_REV
, mgr
->dpcd
, DP_RECEIVER_CAP_SIZE
);
1903 if (ret
!= DP_RECEIVER_CAP_SIZE
) {
1904 DRM_DEBUG_KMS("failed to read DPCD\n");
1908 if (!drm_dp_get_vc_payload_bw(mgr
->dpcd
[1],
1909 mgr
->dpcd
[2] & DP_MAX_LANE_COUNT_MASK
,
1915 mgr
->total_pbn
= 2560;
1916 mgr
->total_slots
= DIV_ROUND_UP(mgr
->total_pbn
, mgr
->pbn_div
);
1917 mgr
->avail_slots
= mgr
->total_slots
;
1919 /* add initial branch device at LCT 1 */
1920 mstb
= drm_dp_add_mst_branch_device(1, NULL
);
1927 /* give this the main reference */
1928 mgr
->mst_primary
= mstb
;
1929 kref_get(&mgr
->mst_primary
->kref
);
1932 struct drm_dp_payload reset_pay
;
1933 reset_pay
.start_slot
= 0;
1934 reset_pay
.num_slots
= 0x3f;
1935 drm_dp_dpcd_write_payload(mgr
, 0, &reset_pay
);
1938 ret
= drm_dp_dpcd_writeb(mgr
->aux
, DP_MSTM_CTRL
,
1939 DP_MST_EN
| DP_UP_REQ_EN
| DP_UPSTREAM_IS_SRC
);
1946 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_GUID
, mgr
->guid
, 16);
1948 DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret
);
1952 mgr
->guid_valid
= drm_dp_validate_guid(mgr
, mgr
->guid
);
1953 if (!mgr
->guid_valid
) {
1954 ret
= drm_dp_dpcd_write(mgr
->aux
, DP_GUID
, mgr
->guid
, 16);
1955 mgr
->guid_valid
= true;
1958 queue_work(system_long_wq
, &mgr
->work
);
1962 /* disable MST on the device */
1963 mstb
= mgr
->mst_primary
;
1964 mgr
->mst_primary
= NULL
;
1965 /* this can fail if the device is gone */
1966 drm_dp_dpcd_writeb(mgr
->aux
, DP_MSTM_CTRL
, 0);
1968 memset(mgr
->payloads
, 0, mgr
->max_payloads
* sizeof(struct drm_dp_payload
));
1969 mgr
->payload_mask
= 0;
1970 set_bit(0, &mgr
->payload_mask
);
1975 mutex_unlock(&mgr
->lock
);
1977 drm_dp_put_mst_branch_device(mstb
);
1981 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst
);
1984 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
1985 * @mgr: manager to suspend
1987 * This function tells the MST device that we can't handle UP messages
1988 * anymore. This should stop it from sending any since we are suspended.
1990 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr
*mgr
)
1992 mutex_lock(&mgr
->lock
);
1993 drm_dp_dpcd_writeb(mgr
->aux
, DP_MSTM_CTRL
,
1994 DP_MST_EN
| DP_UPSTREAM_IS_SRC
);
1995 mutex_unlock(&mgr
->lock
);
1997 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend
);
2000 * drm_dp_mst_topology_mgr_resume() - resume the MST manager
2001 * @mgr: manager to resume
2003 * This will fetch DPCD and see if the device is still there,
2004 * if it is, it will rewrite the MSTM control bits, and return.
2006 * if the device fails this returns -1, and the driver should do
2007 * a full MST reprobe, in case we were undocked.
2009 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr
*mgr
)
2013 mutex_lock(&mgr
->lock
);
2015 if (mgr
->mst_primary
) {
2017 sret
= drm_dp_dpcd_read(mgr
->aux
, DP_DPCD_REV
, mgr
->dpcd
, DP_RECEIVER_CAP_SIZE
);
2018 if (sret
!= DP_RECEIVER_CAP_SIZE
) {
2019 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
2024 ret
= drm_dp_dpcd_writeb(mgr
->aux
, DP_MSTM_CTRL
,
2025 DP_MST_EN
| DP_UP_REQ_EN
| DP_UPSTREAM_IS_SRC
);
2027 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
2036 mutex_unlock(&mgr
->lock
);
2039 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume
);
2041 static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr
*mgr
, bool up
)
2045 int replylen
, origlen
, curreply
;
2047 struct drm_dp_sideband_msg_rx
*msg
;
2048 int basereg
= up
? DP_SIDEBAND_MSG_UP_REQ_BASE
: DP_SIDEBAND_MSG_DOWN_REP_BASE
;
2049 msg
= up
? &mgr
->up_req_recv
: &mgr
->down_rep_recv
;
2051 len
= min(mgr
->max_dpcd_transaction_bytes
, 16);
2052 ret
= drm_dp_dpcd_read(mgr
->aux
, basereg
,
2055 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len
, ret
);
2058 ret
= drm_dp_sideband_msg_build(msg
, replyblock
, len
, true);
2060 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock
[0]);
2063 replylen
= msg
->curchunk_len
+ msg
->curchunk_hdrlen
;
2068 while (replylen
> 0) {
2069 len
= min3(replylen
, mgr
->max_dpcd_transaction_bytes
, 16);
2070 ret
= drm_dp_dpcd_read(mgr
->aux
, basereg
+ curreply
,
2073 DRM_DEBUG_KMS("failed to read a chunk\n");
2075 ret
= drm_dp_sideband_msg_build(msg
, replyblock
, len
, false);
2077 DRM_DEBUG_KMS("failed to build sideband msg\n");
2083 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr
*mgr
)
2087 drm_dp_get_one_sb_msg(mgr
, false);
2089 if (mgr
->down_rep_recv
.have_eomt
) {
2090 struct drm_dp_sideband_msg_tx
*txmsg
;
2091 struct drm_dp_mst_branch
*mstb
;
2093 mstb
= drm_dp_get_mst_branch_device(mgr
,
2094 mgr
->down_rep_recv
.initial_hdr
.lct
,
2095 mgr
->down_rep_recv
.initial_hdr
.rad
);
2098 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr
->down_rep_recv
.initial_hdr
.lct
);
2099 memset(&mgr
->down_rep_recv
, 0, sizeof(struct drm_dp_sideband_msg_rx
));
2103 /* find the message */
2104 slot
= mgr
->down_rep_recv
.initial_hdr
.seqno
;
2105 mutex_lock(&mgr
->qlock
);
2106 txmsg
= mstb
->tx_slots
[slot
];
2107 /* remove from slots */
2108 mutex_unlock(&mgr
->qlock
);
2111 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
2113 mgr
->down_rep_recv
.initial_hdr
.seqno
,
2114 mgr
->down_rep_recv
.initial_hdr
.lct
,
2115 mgr
->down_rep_recv
.initial_hdr
.rad
[0],
2116 mgr
->down_rep_recv
.msg
[0]);
2117 drm_dp_put_mst_branch_device(mstb
);
2118 memset(&mgr
->down_rep_recv
, 0, sizeof(struct drm_dp_sideband_msg_rx
));
2122 drm_dp_sideband_parse_reply(&mgr
->down_rep_recv
, &txmsg
->reply
);
2123 if (txmsg
->reply
.reply_type
== 1) {
2124 DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg
->reply
.req_type
, txmsg
->reply
.u
.nak
.reason
, txmsg
->reply
.u
.nak
.nak_data
);
2127 memset(&mgr
->down_rep_recv
, 0, sizeof(struct drm_dp_sideband_msg_rx
));
2128 drm_dp_put_mst_branch_device(mstb
);
2130 mutex_lock(&mgr
->qlock
);
2131 txmsg
->state
= DRM_DP_SIDEBAND_TX_RX
;
2132 mstb
->tx_slots
[slot
] = NULL
;
2133 mutex_unlock(&mgr
->qlock
);
2135 wake_up(&mgr
->tx_waitq
);
2140 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr
*mgr
)
2143 drm_dp_get_one_sb_msg(mgr
, true);
2145 if (mgr
->up_req_recv
.have_eomt
) {
2146 struct drm_dp_sideband_msg_req_body msg
;
2147 struct drm_dp_mst_branch
*mstb
;
2149 mstb
= drm_dp_get_mst_branch_device(mgr
,
2150 mgr
->up_req_recv
.initial_hdr
.lct
,
2151 mgr
->up_req_recv
.initial_hdr
.rad
);
2153 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr
->up_req_recv
.initial_hdr
.lct
);
2154 memset(&mgr
->up_req_recv
, 0, sizeof(struct drm_dp_sideband_msg_rx
));
2158 seqno
= mgr
->up_req_recv
.initial_hdr
.seqno
;
2159 drm_dp_sideband_parse_req(&mgr
->up_req_recv
, &msg
);
2161 if (msg
.req_type
== DP_CONNECTION_STATUS_NOTIFY
) {
2162 drm_dp_send_up_ack_reply(mgr
, mstb
, msg
.req_type
, seqno
, false);
2163 drm_dp_update_port(mstb
, &msg
.u
.conn_stat
);
2164 DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg
.u
.conn_stat
.port_number
, msg
.u
.conn_stat
.legacy_device_plug_status
, msg
.u
.conn_stat
.displayport_device_plug_status
, msg
.u
.conn_stat
.message_capability_status
, msg
.u
.conn_stat
.input_port
, msg
.u
.conn_stat
.peer_device_type
);
2165 (*mgr
->cbs
->hotplug
)(mgr
);
2167 } else if (msg
.req_type
== DP_RESOURCE_STATUS_NOTIFY
) {
2168 drm_dp_send_up_ack_reply(mgr
, mstb
, msg
.req_type
, seqno
, false);
2169 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg
.u
.resource_stat
.port_number
, msg
.u
.resource_stat
.available_pbn
);
2172 drm_dp_put_mst_branch_device(mstb
);
2173 memset(&mgr
->up_req_recv
, 0, sizeof(struct drm_dp_sideband_msg_rx
));
2179 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
2180 * @mgr: manager to notify irq for.
2181 * @esi: 4 bytes from SINK_COUNT_ESI
2182 * @handled: whether the hpd interrupt was consumed or not
2184 * This should be called from the driver when it detects a short IRQ,
2185 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
2186 * topology manager will process the sideband messages received as a result
2189 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr
*mgr
, u8
*esi
, bool *handled
)
2196 if (sc
!= mgr
->sink_count
) {
2197 mgr
->sink_count
= sc
;
2201 if (esi
[1] & DP_DOWN_REP_MSG_RDY
) {
2202 ret
= drm_dp_mst_handle_down_rep(mgr
);
2206 if (esi
[1] & DP_UP_REQ_MSG_RDY
) {
2207 ret
|= drm_dp_mst_handle_up_req(mgr
);
2211 drm_dp_mst_kick_tx(mgr
);
2214 EXPORT_SYMBOL(drm_dp_mst_hpd_irq
);
2217 * drm_dp_mst_detect_port() - get connection status for an MST port
2218 * @mgr: manager for this port
2219 * @port: unverified pointer to a port
2221 * This returns the current connection state for a port. It validates the
2222 * port pointer still exists so the caller doesn't require a reference
2224 enum drm_connector_status
drm_dp_mst_detect_port(struct drm_connector
*connector
,
2225 struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
2227 enum drm_connector_status status
= connector_status_disconnected
;
2229 /* we need to search for the port in the mgr in case its gone */
2230 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2232 return connector_status_disconnected
;
2237 switch (port
->pdt
) {
2238 case DP_PEER_DEVICE_NONE
:
2239 case DP_PEER_DEVICE_MST_BRANCHING
:
2242 case DP_PEER_DEVICE_SST_SINK
:
2243 status
= connector_status_connected
;
2244 /* for logical ports - cache the EDID */
2245 if (port
->port_num
>= 8 && !port
->cached_edid
) {
2246 port
->cached_edid
= drm_get_edid(connector
, &port
->aux
.ddc
);
2249 case DP_PEER_DEVICE_DP_LEGACY_CONV
:
2251 status
= connector_status_connected
;
2255 drm_dp_put_port(port
);
2258 EXPORT_SYMBOL(drm_dp_mst_detect_port
);
2261 * drm_dp_mst_get_edid() - get EDID for an MST port
2262 * @connector: toplevel connector to get EDID for
2263 * @mgr: manager for this port
2264 * @port: unverified pointer to a port.
2266 * This returns an EDID for the port connected to a connector,
2267 * It validates the pointer still exists so the caller doesn't require a
2270 struct edid
*drm_dp_mst_get_edid(struct drm_connector
*connector
, struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
2272 struct edid
*edid
= NULL
;
2274 /* we need to search for the port in the mgr in case its gone */
2275 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2279 if (port
->cached_edid
)
2280 edid
= drm_edid_duplicate(port
->cached_edid
);
2282 edid
= drm_get_edid(connector
, &port
->aux
.ddc
);
2283 drm_mode_connector_set_tile_property(connector
);
2285 drm_dp_put_port(port
);
2288 EXPORT_SYMBOL(drm_dp_mst_get_edid
);
2291 * drm_dp_find_vcpi_slots() - find slots for this PBN value
2292 * @mgr: manager to use
2293 * @pbn: payload bandwidth to convert into slots.
2295 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr
*mgr
,
2300 num_slots
= DIV_ROUND_UP(pbn
, mgr
->pbn_div
);
2302 if (num_slots
> mgr
->avail_slots
)
2306 EXPORT_SYMBOL(drm_dp_find_vcpi_slots
);
2308 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr
*mgr
,
2309 struct drm_dp_vcpi
*vcpi
, int pbn
)
2314 num_slots
= DIV_ROUND_UP(pbn
, mgr
->pbn_div
);
2316 if (num_slots
> mgr
->avail_slots
)
2320 vcpi
->aligned_pbn
= num_slots
* mgr
->pbn_div
;
2321 vcpi
->num_slots
= num_slots
;
2323 ret
= drm_dp_mst_assign_payload_id(mgr
, vcpi
);
2330 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
2331 * @mgr: manager for this port
2332 * @port: port to allocate a virtual channel for.
2333 * @pbn: payload bandwidth number to request
2334 * @slots: returned number of slots for this PBN.
2336 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
, int pbn
, int *slots
)
2340 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2344 if (port
->vcpi
.vcpi
> 0) {
2345 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port
->vcpi
.vcpi
, port
->vcpi
.pbn
, pbn
);
2346 if (pbn
== port
->vcpi
.pbn
) {
2347 *slots
= port
->vcpi
.num_slots
;
2352 ret
= drm_dp_init_vcpi(mgr
, &port
->vcpi
, pbn
);
2354 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn
, mgr
->pbn_div
), mgr
->avail_slots
, ret
);
2357 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn
, port
->vcpi
.num_slots
);
2358 *slots
= port
->vcpi
.num_slots
;
2360 drm_dp_put_port(port
);
2365 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi
);
2367 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
2370 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2374 slots
= port
->vcpi
.num_slots
;
2375 drm_dp_put_port(port
);
2378 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots
);
2381 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
2382 * @mgr: manager for this port
2383 * @port: unverified pointer to a port.
2385 * This just resets the number of slots for the ports VCPI for later programming.
2387 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
2389 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2392 port
->vcpi
.num_slots
= 0;
2393 drm_dp_put_port(port
);
2395 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots
);
2398 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
2399 * @mgr: manager for this port
2400 * @port: unverified port to deallocate vcpi for
2402 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr
*mgr
, struct drm_dp_mst_port
*port
)
2404 port
= drm_dp_get_validated_port_ref(mgr
, port
);
2408 drm_dp_mst_put_payload_id(mgr
, port
->vcpi
.vcpi
);
2409 port
->vcpi
.num_slots
= 0;
2411 port
->vcpi
.aligned_pbn
= 0;
2412 port
->vcpi
.vcpi
= 0;
2413 drm_dp_put_port(port
);
2415 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi
);
2417 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr
*mgr
,
2418 int id
, struct drm_dp_payload
*payload
)
2420 u8 payload_alloc
[3], status
;
2424 drm_dp_dpcd_writeb(mgr
->aux
, DP_PAYLOAD_TABLE_UPDATE_STATUS
,
2425 DP_PAYLOAD_TABLE_UPDATED
);
2427 payload_alloc
[0] = id
;
2428 payload_alloc
[1] = payload
->start_slot
;
2429 payload_alloc
[2] = payload
->num_slots
;
2431 ret
= drm_dp_dpcd_write(mgr
->aux
, DP_PAYLOAD_ALLOCATE_SET
, payload_alloc
, 3);
2433 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret
);
2438 ret
= drm_dp_dpcd_readb(mgr
->aux
, DP_PAYLOAD_TABLE_UPDATE_STATUS
, &status
);
2440 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret
);
2444 if (!(status
& DP_PAYLOAD_TABLE_UPDATED
)) {
2447 usleep_range(10000, 20000);
2450 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status
);
2461 * drm_dp_check_act_status() - Check ACT handled status.
2462 * @mgr: manager to use
2464 * Check the payload status bits in the DPCD for ACT handled completion.
2466 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr
*mgr
)
2473 ret
= drm_dp_dpcd_readb(mgr
->aux
, DP_PAYLOAD_TABLE_UPDATE_STATUS
, &status
);
2476 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret
);
2480 if (status
& DP_PAYLOAD_ACT_HANDLED
)
2485 } while (count
< 30);
2487 if (!(status
& DP_PAYLOAD_ACT_HANDLED
)) {
2488 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status
, count
);
2496 EXPORT_SYMBOL(drm_dp_check_act_status
);
2499 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
2500 * @clock: dot clock for the mode
2501 * @bpp: bpp for the mode.
2503 * This uses the formula in the spec to calculate the PBN value for a mode.
2505 int drm_dp_calc_pbn_mode(int clock
, int bpp
)
2510 fixed20_12 margin
, tmp
;
2513 pix_bw
.full
= dfixed_const(clock
);
2514 fbpp
.full
= dfixed_const(bpp
);
2515 tmp
.full
= dfixed_const(8);
2516 fbpp
.full
= dfixed_div(fbpp
, tmp
);
2518 result
.full
= dfixed_mul(pix_bw
, fbpp
);
2519 margin
.full
= dfixed_const(54);
2520 tmp
.full
= dfixed_const(64);
2521 margin
.full
= dfixed_div(margin
, tmp
);
2522 result
.full
= dfixed_div(result
, margin
);
2524 margin
.full
= dfixed_const(1006);
2525 tmp
.full
= dfixed_const(1000);
2526 margin
.full
= dfixed_div(margin
, tmp
);
2527 result
.full
= dfixed_mul(result
, margin
);
2529 result
.full
= dfixed_div(result
, tmp
);
2530 result
.full
= dfixed_ceil(result
);
2531 res
= dfixed_trunc(result
);
2534 EXPORT_SYMBOL(drm_dp_calc_pbn_mode
);
2536 static int test_calc_pbn_mode(void)
2539 ret
= drm_dp_calc_pbn_mode(154000, 30);
2542 ret
= drm_dp_calc_pbn_mode(234000, 30);
2548 /* we want to kick the TX after we've ack the up/down IRQs. */
2549 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr
*mgr
)
2551 queue_work(system_long_wq
, &mgr
->tx_work
);
2554 static void drm_dp_mst_dump_mstb(struct seq_file
*m
,
2555 struct drm_dp_mst_branch
*mstb
)
2557 struct drm_dp_mst_port
*port
;
2558 int tabs
= mstb
->lct
;
2562 for (i
= 0; i
< tabs
; i
++)
2566 seq_printf(m
, "%smst: %p, %d\n", prefix
, mstb
, mstb
->num_ports
);
2567 list_for_each_entry(port
, &mstb
->ports
, next
) {
2568 seq_printf(m
, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix
, port
->port_num
, port
->ddps
, port
->ldps
, port
, port
->connector
);
2570 drm_dp_mst_dump_mstb(m
, port
->mstb
);
2574 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr
*mgr
,
2579 for (i
= 0; i
< 4; i
++) {
2580 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_PAYLOAD_TABLE_UPDATE_STATUS
+ (i
* 16), &buf
[i
* 16], 16);
2590 * drm_dp_mst_dump_topology(): dump topology to seq file.
2591 * @m: seq_file to dump output to
2592 * @mgr: manager to dump current topology for.
2594 * helper to dump MST topology to a seq file for debugfs.
2596 void drm_dp_mst_dump_topology(struct seq_file
*m
,
2597 struct drm_dp_mst_topology_mgr
*mgr
)
2600 struct drm_dp_mst_port
*port
;
2601 mutex_lock(&mgr
->lock
);
2602 if (mgr
->mst_primary
)
2603 drm_dp_mst_dump_mstb(m
, mgr
->mst_primary
);
2606 mutex_unlock(&mgr
->lock
);
2608 mutex_lock(&mgr
->payload_lock
);
2609 seq_printf(m
, "vcpi: %lx %lx\n", mgr
->payload_mask
, mgr
->vcpi_mask
);
2611 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
2612 if (mgr
->proposed_vcpis
[i
]) {
2613 port
= container_of(mgr
->proposed_vcpis
[i
], struct drm_dp_mst_port
, vcpi
);
2614 seq_printf(m
, "vcpi %d: %d %d %d\n", i
, port
->port_num
, port
->vcpi
.vcpi
, port
->vcpi
.num_slots
);
2616 seq_printf(m
, "vcpi %d:unsed\n", i
);
2618 for (i
= 0; i
< mgr
->max_payloads
; i
++) {
2619 seq_printf(m
, "payload %d: %d, %d, %d\n",
2621 mgr
->payloads
[i
].payload_state
,
2622 mgr
->payloads
[i
].start_slot
,
2623 mgr
->payloads
[i
].num_slots
);
2627 mutex_unlock(&mgr
->payload_lock
);
2629 mutex_lock(&mgr
->lock
);
2630 if (mgr
->mst_primary
) {
2634 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_DPCD_REV
, buf
, DP_RECEIVER_CAP_SIZE
);
2635 seq_printf(m
, "dpcd: ");
2636 for (i
= 0; i
< DP_RECEIVER_CAP_SIZE
; i
++)
2637 seq_printf(m
, "%02x ", buf
[i
]);
2638 seq_printf(m
, "\n");
2639 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_FAUX_CAP
, buf
, 2);
2640 seq_printf(m
, "faux/mst: ");
2641 for (i
= 0; i
< 2; i
++)
2642 seq_printf(m
, "%02x ", buf
[i
]);
2643 seq_printf(m
, "\n");
2644 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_MSTM_CTRL
, buf
, 1);
2645 seq_printf(m
, "mst ctrl: ");
2646 for (i
= 0; i
< 1; i
++)
2647 seq_printf(m
, "%02x ", buf
[i
]);
2648 seq_printf(m
, "\n");
2650 /* dump the standard OUI branch header */
2651 ret
= drm_dp_dpcd_read(mgr
->aux
, DP_BRANCH_OUI
, buf
, DP_BRANCH_OUI_HEADER_SIZE
);
2652 seq_printf(m
, "branch oui: ");
2653 for (i
= 0; i
< 0x3; i
++)
2654 seq_printf(m
, "%02x", buf
[i
]);
2655 seq_printf(m
, " devid: ");
2656 for (i
= 0x3; i
< 0x8; i
++)
2657 seq_printf(m
, "%c", buf
[i
]);
2658 seq_printf(m
, " revision: hw: %x.%x sw: %x.%x", buf
[0x9] >> 4, buf
[0x9] & 0xf, buf
[0xa], buf
[0xb]);
2659 seq_printf(m
, "\n");
2660 bret
= dump_dp_payload_table(mgr
, buf
);
2662 seq_printf(m
, "payload table: ");
2663 for (i
= 0; i
< 63; i
++)
2664 seq_printf(m
, "%02x ", buf
[i
]);
2665 seq_printf(m
, "\n");
2670 mutex_unlock(&mgr
->lock
);
2673 EXPORT_SYMBOL(drm_dp_mst_dump_topology
);
2675 static void drm_dp_tx_work(struct work_struct
*work
)
2677 struct drm_dp_mst_topology_mgr
*mgr
= container_of(work
, struct drm_dp_mst_topology_mgr
, tx_work
);
2679 mutex_lock(&mgr
->qlock
);
2680 if (mgr
->tx_down_in_progress
)
2681 process_single_down_tx_qlock(mgr
);
2682 mutex_unlock(&mgr
->qlock
);
2685 static void drm_dp_destroy_connector_work(struct work_struct
*work
)
2687 struct drm_dp_mst_topology_mgr
*mgr
= container_of(work
, struct drm_dp_mst_topology_mgr
, destroy_connector_work
);
2688 struct drm_dp_mst_port
*port
;
2689 bool send_hotplug
= false;
2691 * Not a regular list traverse as we have to drop the destroy
2692 * connector lock before destroying the connector, to avoid AB->BA
2693 * ordering between this lock and the config mutex.
2696 mutex_lock(&mgr
->destroy_connector_lock
);
2697 port
= list_first_entry_or_null(&mgr
->destroy_connector_list
, struct drm_dp_mst_port
, next
);
2699 mutex_unlock(&mgr
->destroy_connector_lock
);
2702 list_del(&port
->next
);
2703 mutex_unlock(&mgr
->destroy_connector_lock
);
2705 mgr
->cbs
->destroy_connector(mgr
, port
->connector
);
2707 drm_dp_port_teardown_pdt(port
, port
->pdt
);
2709 if (!port
->input
&& port
->vcpi
.vcpi
> 0)
2710 drm_dp_mst_put_payload_id(mgr
, port
->vcpi
.vcpi
);
2712 send_hotplug
= true;
2715 (*mgr
->cbs
->hotplug
)(mgr
);
2719 * drm_dp_mst_topology_mgr_init - initialise a topology manager
2720 * @mgr: manager struct to initialise
2721 * @dev: device providing this structure - for i2c addition.
2722 * @aux: DP helper aux channel to talk to this device
2723 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
2724 * @max_payloads: maximum number of payloads this GPU can source
2725 * @conn_base_id: the connector object ID the MST device is connected to.
2727 * Return 0 for success, or negative error code on failure
2729 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr
*mgr
,
2730 struct device
*dev
, struct drm_dp_aux
*aux
,
2731 int max_dpcd_transaction_bytes
,
2732 int max_payloads
, int conn_base_id
)
2734 mutex_init(&mgr
->lock
);
2735 mutex_init(&mgr
->qlock
);
2736 mutex_init(&mgr
->payload_lock
);
2737 mutex_init(&mgr
->destroy_connector_lock
);
2738 INIT_LIST_HEAD(&mgr
->tx_msg_upq
);
2739 INIT_LIST_HEAD(&mgr
->tx_msg_downq
);
2740 INIT_LIST_HEAD(&mgr
->destroy_connector_list
);
2741 INIT_WORK(&mgr
->work
, drm_dp_mst_link_probe_work
);
2742 INIT_WORK(&mgr
->tx_work
, drm_dp_tx_work
);
2743 INIT_WORK(&mgr
->destroy_connector_work
, drm_dp_destroy_connector_work
);
2744 init_waitqueue_head(&mgr
->tx_waitq
);
2747 mgr
->max_dpcd_transaction_bytes
= max_dpcd_transaction_bytes
;
2748 mgr
->max_payloads
= max_payloads
;
2749 mgr
->conn_base_id
= conn_base_id
;
2750 mgr
->payloads
= kcalloc(max_payloads
, sizeof(struct drm_dp_payload
), GFP_KERNEL
);
2753 mgr
->proposed_vcpis
= kcalloc(max_payloads
, sizeof(struct drm_dp_vcpi
*), GFP_KERNEL
);
2754 if (!mgr
->proposed_vcpis
)
2756 set_bit(0, &mgr
->payload_mask
);
2757 test_calc_pbn_mode();
2760 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init
);
2763 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
2764 * @mgr: manager to destroy
2766 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr
*mgr
)
2768 flush_work(&mgr
->destroy_connector_work
);
2769 mutex_lock(&mgr
->payload_lock
);
2770 kfree(mgr
->payloads
);
2771 mgr
->payloads
= NULL
;
2772 kfree(mgr
->proposed_vcpis
);
2773 mgr
->proposed_vcpis
= NULL
;
2774 mutex_unlock(&mgr
->payload_lock
);
2778 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy
);
2781 static int drm_dp_mst_i2c_xfer(struct i2c_adapter
*adapter
, struct i2c_msg
*msgs
,
2784 struct drm_dp_aux
*aux
= adapter
->algo_data
;
2785 struct drm_dp_mst_port
*port
= container_of(aux
, struct drm_dp_mst_port
, aux
);
2786 struct drm_dp_mst_branch
*mstb
;
2787 struct drm_dp_mst_topology_mgr
*mgr
= port
->mgr
;
2789 bool reading
= false;
2790 struct drm_dp_sideband_msg_req_body msg
;
2791 struct drm_dp_sideband_msg_tx
*txmsg
= NULL
;
2794 mstb
= drm_dp_get_validated_mstb_ref(mgr
, port
->parent
);
2798 /* construct i2c msg */
2799 /* see if last msg is a read */
2800 if (msgs
[num
- 1].flags
& I2C_M_RD
)
2804 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
2809 msg
.req_type
= DP_REMOTE_I2C_READ
;
2810 msg
.u
.i2c_read
.num_transactions
= num
- 1;
2811 msg
.u
.i2c_read
.port_number
= port
->port_num
;
2812 for (i
= 0; i
< num
- 1; i
++) {
2813 msg
.u
.i2c_read
.transactions
[i
].i2c_dev_id
= msgs
[i
].addr
;
2814 msg
.u
.i2c_read
.transactions
[i
].num_bytes
= msgs
[i
].len
;
2815 msg
.u
.i2c_read
.transactions
[i
].bytes
= msgs
[i
].buf
;
2817 msg
.u
.i2c_read
.read_i2c_device_id
= msgs
[num
- 1].addr
;
2818 msg
.u
.i2c_read
.num_bytes_read
= msgs
[num
- 1].len
;
2820 txmsg
= kzalloc(sizeof(*txmsg
), GFP_KERNEL
);
2827 drm_dp_encode_sideband_req(&msg
, txmsg
);
2829 drm_dp_queue_down_tx(mgr
, txmsg
);
2831 ret
= drm_dp_mst_wait_tx_reply(mstb
, txmsg
);
2834 if (txmsg
->reply
.reply_type
== 1) { /* got a NAK back */
2838 if (txmsg
->reply
.u
.remote_i2c_read_ack
.num_bytes
!= msgs
[num
- 1].len
) {
2842 memcpy(msgs
[num
- 1].buf
, txmsg
->reply
.u
.remote_i2c_read_ack
.bytes
, msgs
[num
- 1].len
);
2847 drm_dp_put_mst_branch_device(mstb
);
2851 static u32
drm_dp_mst_i2c_functionality(struct i2c_adapter
*adapter
)
2853 return I2C_FUNC_I2C
| I2C_FUNC_SMBUS_EMUL
|
2854 I2C_FUNC_SMBUS_READ_BLOCK_DATA
|
2855 I2C_FUNC_SMBUS_BLOCK_PROC_CALL
|
2856 I2C_FUNC_10BIT_ADDR
;
2859 static const struct i2c_algorithm drm_dp_mst_i2c_algo
= {
2860 .functionality
= drm_dp_mst_i2c_functionality
,
2861 .master_xfer
= drm_dp_mst_i2c_xfer
,
2865 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
2866 * @aux: DisplayPort AUX channel
2868 * Returns 0 on success or a negative error code on failure.
2870 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux
*aux
)
2872 aux
->ddc
.algo
= &drm_dp_mst_i2c_algo
;
2873 aux
->ddc
.algo_data
= aux
;
2874 aux
->ddc
.retries
= 3;
2876 aux
->ddc
.class = I2C_CLASS_DDC
;
2877 aux
->ddc
.owner
= THIS_MODULE
;
2878 aux
->ddc
.dev
.parent
= aux
->dev
;
2879 aux
->ddc
.dev
.of_node
= aux
->dev
->of_node
;
2881 strlcpy(aux
->ddc
.name
, aux
->name
? aux
->name
: dev_name(aux
->dev
),
2882 sizeof(aux
->ddc
.name
));
2884 return i2c_add_adapter(&aux
->ddc
);
2888 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
2889 * @aux: DisplayPort AUX channel
2891 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux
*aux
)
2893 i2c_del_adapter(&aux
->ddc
);