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1/*
2 * Copyright 2022 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26/* FILE POLICY AND INTENDED USAGE:
27 * This file manages link detection states and receiver states by using various
28 * link protocols. It also provides helper functions to interpret certain
29 * capabilities or status based on the states it manages or retrieve them
30 * directly from connected receivers.
31 */
32
33#include "link_dpms.h"
34#include "link_detection.h"
35#include "link_hwss.h"
36#include "protocols/link_edp_panel_control.h"
37#include "protocols/link_ddc.h"
38#include "protocols/link_hpd.h"
39#include "protocols/link_dpcd.h"
40#include "protocols/link_dp_capability.h"
41#include "protocols/link_dp_dpia.h"
42#include "protocols/link_dp_phy.h"
43#include "protocols/link_dp_training.h"
44#include "protocols/link_dp_dpia_bw.h"
45#include "accessories/link_dp_trace.h"
46
47#include "link_enc_cfg.h"
48#include "dm_helpers.h"
49#include "clk_mgr.h"
50
51 // Offset DPCD 050Eh == 0x5A
52#define MST_HUB_ID_0x5A 0x5A
53
54#define DC_LOGGER \
55 link->ctx->logger
56#define DC_LOGGER_INIT(logger)
57
58#define LINK_INFO(...) \
59 DC_LOG_HW_HOTPLUG( \
60 __VA_ARGS__)
61/*
62 * Some receivers fail to train on first try and are good
63 * on subsequent tries. 2 retries should be plenty. If we
64 * don't have a successful training then we don't expect to
65 * ever get one.
66 */
67#define LINK_TRAINING_MAX_VERIFY_RETRY 2
68
69static const u8 DP_SINK_BRANCH_DEV_NAME_7580[] = "7580\x80u";
70
71static const u8 dp_hdmi_dongle_signature_str[] = "DP-HDMI ADAPTOR";
72
73static enum ddc_transaction_type get_ddc_transaction_type(enum signal_type sink_signal)
74{
75 enum ddc_transaction_type transaction_type = DDC_TRANSACTION_TYPE_NONE;
76
77 switch (sink_signal) {
78 case SIGNAL_TYPE_DVI_SINGLE_LINK:
79 case SIGNAL_TYPE_DVI_DUAL_LINK:
80 case SIGNAL_TYPE_HDMI_TYPE_A:
81 case SIGNAL_TYPE_LVDS:
82 case SIGNAL_TYPE_RGB:
83 transaction_type = DDC_TRANSACTION_TYPE_I2C;
84 break;
85
86 case SIGNAL_TYPE_DISPLAY_PORT:
87 case SIGNAL_TYPE_EDP:
88 transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
89 break;
90
91 case SIGNAL_TYPE_DISPLAY_PORT_MST:
92 /* MST does not use I2COverAux, but there is the
93 * SPECIAL use case for "immediate dwnstrm device
94 * access" (EPR#370830).
95 */
96 transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
97 break;
98
99 default:
100 break;
101 }
102
103 return transaction_type;
104}
105
106static enum signal_type get_basic_signal_type(struct graphics_object_id encoder,
107 struct graphics_object_id downstream)
108{
109 if (downstream.type == OBJECT_TYPE_CONNECTOR) {
110 switch (downstream.id) {
111 case CONNECTOR_ID_SINGLE_LINK_DVII:
112 switch (encoder.id) {
113 case ENCODER_ID_INTERNAL_DAC1:
114 case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
115 case ENCODER_ID_INTERNAL_DAC2:
116 case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
117 return SIGNAL_TYPE_RGB;
118 default:
119 return SIGNAL_TYPE_DVI_SINGLE_LINK;
120 }
121 break;
122 case CONNECTOR_ID_DUAL_LINK_DVII:
123 {
124 switch (encoder.id) {
125 case ENCODER_ID_INTERNAL_DAC1:
126 case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
127 case ENCODER_ID_INTERNAL_DAC2:
128 case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
129 return SIGNAL_TYPE_RGB;
130 default:
131 return SIGNAL_TYPE_DVI_DUAL_LINK;
132 }
133 }
134 break;
135 case CONNECTOR_ID_SINGLE_LINK_DVID:
136 return SIGNAL_TYPE_DVI_SINGLE_LINK;
137 case CONNECTOR_ID_DUAL_LINK_DVID:
138 return SIGNAL_TYPE_DVI_DUAL_LINK;
139 case CONNECTOR_ID_VGA:
140 return SIGNAL_TYPE_RGB;
141 case CONNECTOR_ID_HDMI_TYPE_A:
142 return SIGNAL_TYPE_HDMI_TYPE_A;
143 case CONNECTOR_ID_LVDS:
144 return SIGNAL_TYPE_LVDS;
145 case CONNECTOR_ID_DISPLAY_PORT:
146 case CONNECTOR_ID_USBC:
147 return SIGNAL_TYPE_DISPLAY_PORT;
148 case CONNECTOR_ID_EDP:
149 return SIGNAL_TYPE_EDP;
150 default:
151 return SIGNAL_TYPE_NONE;
152 }
153 } else if (downstream.type == OBJECT_TYPE_ENCODER) {
154 switch (downstream.id) {
155 case ENCODER_ID_EXTERNAL_NUTMEG:
156 case ENCODER_ID_EXTERNAL_TRAVIS:
157 return SIGNAL_TYPE_DISPLAY_PORT;
158 default:
159 return SIGNAL_TYPE_NONE;
160 }
161 }
162
163 return SIGNAL_TYPE_NONE;
164}
165
166/*
167 * @brief
168 * Detect output sink type
169 */
170static enum signal_type link_detect_sink_signal_type(struct dc_link *link,
171 enum dc_detect_reason reason)
172{
173 enum signal_type result;
174 struct graphics_object_id enc_id;
175
176 if (link->is_dig_mapping_flexible)
177 enc_id = (struct graphics_object_id){.id = ENCODER_ID_UNKNOWN};
178 else
179 enc_id = link->link_enc->id;
180 result = get_basic_signal_type(enc_id, link->link_id);
181
182 /* Use basic signal type for link without physical connector. */
183 if (link->ep_type != DISPLAY_ENDPOINT_PHY)
184 return result;
185
186 /* Internal digital encoder will detect only dongles
187 * that require digital signal
188 */
189
190 /* Detection mechanism is different
191 * for different native connectors.
192 * LVDS connector supports only LVDS signal;
193 * PCIE is a bus slot, the actual connector needs to be detected first;
194 * eDP connector supports only eDP signal;
195 * HDMI should check straps for audio
196 */
197
198 /* PCIE detects the actual connector on add-on board */
199 if (link->link_id.id == CONNECTOR_ID_PCIE) {
200 /* ZAZTODO implement PCIE add-on card detection */
201 }
202
203 switch (link->link_id.id) {
204 case CONNECTOR_ID_HDMI_TYPE_A: {
205 /* check audio support:
206 * if native HDMI is not supported, switch to DVI
207 */
208 struct audio_support *aud_support =
209 &link->dc->res_pool->audio_support;
210
211 if (!aud_support->hdmi_audio_native)
212 if (link->link_id.id == CONNECTOR_ID_HDMI_TYPE_A)
213 result = SIGNAL_TYPE_DVI_SINGLE_LINK;
214 }
215 break;
216 case CONNECTOR_ID_DISPLAY_PORT:
217 case CONNECTOR_ID_USBC: {
218 /* DP HPD short pulse. Passive DP dongle will not
219 * have short pulse
220 */
221 if (reason != DETECT_REASON_HPDRX) {
222 /* Check whether DP signal detected: if not -
223 * we assume signal is DVI; it could be corrected
224 * to HDMI after dongle detection
225 */
226 if (!dm_helpers_is_dp_sink_present(link))
227 result = SIGNAL_TYPE_DVI_SINGLE_LINK;
228 }
229 }
230 break;
231 default:
232 break;
233 }
234
235 return result;
236}
237
238static enum signal_type decide_signal_from_strap_and_dongle_type(enum display_dongle_type dongle_type,
239 struct audio_support *audio_support)
240{
241 enum signal_type signal = SIGNAL_TYPE_NONE;
242
243 switch (dongle_type) {
244 case DISPLAY_DONGLE_DP_HDMI_DONGLE:
245 if (audio_support->hdmi_audio_on_dongle)
246 signal = SIGNAL_TYPE_HDMI_TYPE_A;
247 else
248 signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
249 break;
250 case DISPLAY_DONGLE_DP_DVI_DONGLE:
251 signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
252 break;
253 case DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE:
254 if (audio_support->hdmi_audio_native)
255 signal = SIGNAL_TYPE_HDMI_TYPE_A;
256 else
257 signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
258 break;
259 default:
260 signal = SIGNAL_TYPE_NONE;
261 break;
262 }
263
264 return signal;
265}
266
267static void read_scdc_caps(struct ddc_service *ddc_service,
268 struct dc_sink *sink)
269{
270 uint8_t slave_address = HDMI_SCDC_ADDRESS;
271 uint8_t offset = HDMI_SCDC_MANUFACTURER_OUI;
272
273 link_query_ddc_data(ddc_service, slave_address, &offset,
274 sizeof(offset), sink->scdc_caps.manufacturer_OUI.byte,
275 sizeof(sink->scdc_caps.manufacturer_OUI.byte));
276
277 offset = HDMI_SCDC_DEVICE_ID;
278
279 link_query_ddc_data(ddc_service, slave_address, &offset,
280 sizeof(offset), &(sink->scdc_caps.device_id.byte),
281 sizeof(sink->scdc_caps.device_id.byte));
282}
283
284static bool i2c_read(
285 struct ddc_service *ddc,
286 uint32_t address,
287 uint8_t *buffer,
288 uint32_t len)
289{
290 uint8_t offs_data = 0;
291 struct i2c_payload payloads[2] = {
292 {
293 .write = true,
294 .address = address,
295 .length = 1,
296 .data = &offs_data },
297 {
298 .write = false,
299 .address = address,
300 .length = len,
301 .data = buffer } };
302
303 struct i2c_command command = {
304 .payloads = payloads,
305 .number_of_payloads = 2,
306 .engine = DDC_I2C_COMMAND_ENGINE,
307 .speed = ddc->ctx->dc->caps.i2c_speed_in_khz };
308
309 return dm_helpers_submit_i2c(
310 ddc->ctx,
311 ddc->link,
312 &command);
313}
314
315enum {
316 DP_SINK_CAP_SIZE =
317 DP_EDP_CONFIGURATION_CAP - DP_DPCD_REV + 1
318};
319
320static void query_dp_dual_mode_adaptor(
321 struct ddc_service *ddc,
322 struct display_sink_capability *sink_cap)
323{
324 uint8_t i;
325 bool is_valid_hdmi_signature;
326 enum display_dongle_type *dongle = &sink_cap->dongle_type;
327 uint8_t type2_dongle_buf[DP_ADAPTOR_TYPE2_SIZE];
328 bool is_type2_dongle = false;
329 int retry_count = 2;
330 struct dp_hdmi_dongle_signature_data *dongle_signature;
331 struct dc_link *link = ddc->link;
332
333 /* Assume we have no valid DP passive dongle connected */
334 *dongle = DISPLAY_DONGLE_NONE;
335 sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_HDMI_SAFE_MAX_TMDS_CLK;
336
337 /* Read DP-HDMI dongle I2c (no response interpreted as DP-DVI dongle)*/
338 if (!i2c_read(
339 ddc,
340 DP_HDMI_DONGLE_ADDRESS,
341 type2_dongle_buf,
342 sizeof(type2_dongle_buf))) {
343 /* Passive HDMI dongles can sometimes fail here without retrying*/
344 while (retry_count > 0) {
345 if (i2c_read(ddc,
346 DP_HDMI_DONGLE_ADDRESS,
347 type2_dongle_buf,
348 sizeof(type2_dongle_buf)))
349 break;
350 retry_count--;
351 }
352 if (retry_count == 0) {
353 *dongle = DISPLAY_DONGLE_DP_DVI_DONGLE;
354 sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_DVI_MAX_TMDS_CLK;
355
356 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, sizeof(type2_dongle_buf),
357 "DP-DVI passive dongle %dMhz: ",
358 DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000);
359 return;
360 }
361 }
362
363 /* Check if Type 2 dongle.*/
364 if (type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_ID] == DP_ADAPTOR_TYPE2_ID)
365 is_type2_dongle = true;
366
367 dongle_signature =
368 (struct dp_hdmi_dongle_signature_data *)type2_dongle_buf;
369
370 is_valid_hdmi_signature = true;
371
372 /* Check EOT */
373 if (dongle_signature->eot != DP_HDMI_DONGLE_SIGNATURE_EOT) {
374 is_valid_hdmi_signature = false;
375 }
376
377 /* Check signature */
378 for (i = 0; i < sizeof(dongle_signature->id); ++i) {
379 /* If its not the right signature,
380 * skip mismatch in subversion byte.*/
381 if (dongle_signature->id[i] !=
382 dp_hdmi_dongle_signature_str[i] && i != 3) {
383
384 if (is_type2_dongle) {
385 is_valid_hdmi_signature = false;
386 break;
387 }
388
389 }
390 }
391
392 if (is_type2_dongle) {
393 uint32_t max_tmds_clk =
394 type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_MAX_TMDS_CLK];
395
396 max_tmds_clk = max_tmds_clk * 2 + max_tmds_clk / 2;
397
398 if (0 == max_tmds_clk ||
399 max_tmds_clk < DP_ADAPTOR_TYPE2_MIN_TMDS_CLK ||
400 max_tmds_clk > DP_ADAPTOR_TYPE2_MAX_TMDS_CLK) {
401 *dongle = DISPLAY_DONGLE_DP_DVI_DONGLE;
402
403 CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
404 sizeof(type2_dongle_buf),
405 "DP-DVI passive dongle %dMhz: ",
406 DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000);
407 } else {
408 if (is_valid_hdmi_signature == true) {
409 *dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE;
410
411 CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
412 sizeof(type2_dongle_buf),
413 "Type 2 DP-HDMI passive dongle %dMhz: ",
414 max_tmds_clk);
415 } else {
416 *dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE;
417
418 CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
419 sizeof(type2_dongle_buf),
420 "Type 2 DP-HDMI passive dongle (no signature) %dMhz: ",
421 max_tmds_clk);
422
423 }
424
425 /* Multiply by 1000 to convert to kHz. */
426 sink_cap->max_hdmi_pixel_clock =
427 max_tmds_clk * 1000;
428 }
429 sink_cap->is_dongle_type_one = false;
430
431 } else {
432 if (is_valid_hdmi_signature == true) {
433 *dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE;
434
435 CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
436 sizeof(type2_dongle_buf),
437 "Type 1 DP-HDMI passive dongle %dMhz: ",
438 sink_cap->max_hdmi_pixel_clock / 1000);
439 } else {
440 *dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE;
441
442 CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
443 sizeof(type2_dongle_buf),
444 "Type 1 DP-HDMI passive dongle (no signature) %dMhz: ",
445 sink_cap->max_hdmi_pixel_clock / 1000);
446 }
447 sink_cap->is_dongle_type_one = true;
448 }
449
450 return;
451}
452
453static enum signal_type dp_passive_dongle_detection(struct ddc_service *ddc,
454 struct display_sink_capability *sink_cap,
455 struct audio_support *audio_support)
456{
457 query_dp_dual_mode_adaptor(ddc, sink_cap);
458
459 return decide_signal_from_strap_and_dongle_type(sink_cap->dongle_type,
460 audio_support);
461}
462
463static void link_disconnect_sink(struct dc_link *link)
464{
465 if (link->local_sink) {
466 dc_sink_release(link->local_sink);
467 link->local_sink = NULL;
468 }
469
470 link->dpcd_sink_count = 0;
471 //link->dpcd_caps.dpcd_rev.raw = 0;
472}
473
474static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *link)
475{
476 dc_sink_release(link->local_sink);
477 link->local_sink = prev_sink;
478}
479
480static void query_hdcp_capability(enum signal_type signal, struct dc_link *link)
481{
482 struct hdcp_protection_message msg22;
483 struct hdcp_protection_message msg14;
484
485 memset(&msg22, 0, sizeof(struct hdcp_protection_message));
486 memset(&msg14, 0, sizeof(struct hdcp_protection_message));
487 memset(link->hdcp_caps.rx_caps.raw, 0,
488 sizeof(link->hdcp_caps.rx_caps.raw));
489
490 if ((link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
491 link->ddc->transaction_type ==
492 DDC_TRANSACTION_TYPE_I2C_OVER_AUX) ||
493 link->connector_signal == SIGNAL_TYPE_EDP) {
494 msg22.data = link->hdcp_caps.rx_caps.raw;
495 msg22.length = sizeof(link->hdcp_caps.rx_caps.raw);
496 msg22.msg_id = HDCP_MESSAGE_ID_RX_CAPS;
497 } else {
498 msg22.data = &link->hdcp_caps.rx_caps.fields.version;
499 msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version);
500 msg22.msg_id = HDCP_MESSAGE_ID_HDCP2VERSION;
501 }
502 msg22.version = HDCP_VERSION_22;
503 msg22.link = HDCP_LINK_PRIMARY;
504 msg22.max_retries = 5;
505 dc_process_hdcp_msg(signal, link, &msg22);
506
507 if (signal == SIGNAL_TYPE_DISPLAY_PORT || signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
508 msg14.data = &link->hdcp_caps.bcaps.raw;
509 msg14.length = sizeof(link->hdcp_caps.bcaps.raw);
510 msg14.msg_id = HDCP_MESSAGE_ID_READ_BCAPS;
511 msg14.version = HDCP_VERSION_14;
512 msg14.link = HDCP_LINK_PRIMARY;
513 msg14.max_retries = 5;
514
515 dc_process_hdcp_msg(signal, link, &msg14);
516 }
517
518}
519static void read_current_link_settings_on_detect(struct dc_link *link)
520{
521 union lane_count_set lane_count_set = {0};
522 uint8_t link_bw_set = 0;
523 uint8_t link_rate_set = 0;
524 uint32_t read_dpcd_retry_cnt = 10;
525 enum dc_status status = DC_ERROR_UNEXPECTED;
526 int i;
527 union max_down_spread max_down_spread = {0};
528
529 // Read DPCD 00101h to find out the number of lanes currently set
530 for (i = 0; i < read_dpcd_retry_cnt; i++) {
531 status = core_link_read_dpcd(link,
532 DP_LANE_COUNT_SET,
533 &lane_count_set.raw,
534 sizeof(lane_count_set));
535 /* First DPCD read after VDD ON can fail if the particular board
536 * does not have HPD pin wired correctly. So if DPCD read fails,
537 * which it should never happen, retry a few times. Target worst
538 * case scenario of 80 ms.
539 */
540 if (status == DC_OK) {
541 link->cur_link_settings.lane_count =
542 lane_count_set.bits.LANE_COUNT_SET;
543 break;
544 }
545
546 msleep(8);
547 }
548
549 // Read DPCD 00100h to find if standard link rates are set
550 core_link_read_dpcd(link, DP_LINK_BW_SET,
551 &link_bw_set, sizeof(link_bw_set));
552
553 if (link_bw_set == 0) {
554 if (link->connector_signal == SIGNAL_TYPE_EDP) {
555 /* If standard link rates are not being used,
556 * Read DPCD 00115h to find the edp link rate set used
557 */
558 core_link_read_dpcd(link, DP_LINK_RATE_SET,
559 &link_rate_set, sizeof(link_rate_set));
560
561 // edp_supported_link_rates_count = 0 for DP
562 if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) {
563 link->cur_link_settings.link_rate =
564 link->dpcd_caps.edp_supported_link_rates[link_rate_set];
565 link->cur_link_settings.link_rate_set = link_rate_set;
566 link->cur_link_settings.use_link_rate_set = true;
567 }
568 } else {
569 // Link Rate not found. Seamless boot may not work.
570 ASSERT(false);
571 }
572 } else {
573 link->cur_link_settings.link_rate = link_bw_set;
574 link->cur_link_settings.use_link_rate_set = false;
575 }
576 // Read DPCD 00003h to find the max down spread.
577 core_link_read_dpcd(link, DP_MAX_DOWNSPREAD,
578 &max_down_spread.raw, sizeof(max_down_spread));
579 link->cur_link_settings.link_spread =
580 max_down_spread.bits.MAX_DOWN_SPREAD ?
581 LINK_SPREAD_05_DOWNSPREAD_30KHZ : LINK_SPREAD_DISABLED;
582}
583
584static bool detect_dp(struct dc_link *link,
585 struct display_sink_capability *sink_caps,
586 enum dc_detect_reason reason)
587{
588 struct audio_support *audio_support = &link->dc->res_pool->audio_support;
589
590 sink_caps->signal = link_detect_sink_signal_type(link, reason);
591 sink_caps->transaction_type =
592 get_ddc_transaction_type(sink_caps->signal);
593
594 if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
595 sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
596 if (!detect_dp_sink_caps(link))
597 return false;
598
599 if (is_dp_branch_device(link))
600 /* DP SST branch */
601 link->type = dc_connection_sst_branch;
602 } else {
603 if (link->dc->debug.disable_dp_plus_plus_wa &&
604 link->link_enc->features.flags.bits.IS_UHBR20_CAPABLE)
605 return false;
606
607 /* DP passive dongles */
608 sink_caps->signal = dp_passive_dongle_detection(link->ddc,
609 sink_caps,
610 audio_support);
611 link->dpcd_caps.dongle_type = sink_caps->dongle_type;
612 link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one;
613 link->dpcd_caps.dpcd_rev.raw = 0;
614 }
615
616 return true;
617}
618
619static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
620{
621 if (old_edid->length != new_edid->length)
622 return false;
623
624 if (new_edid->length == 0)
625 return false;
626
627 return (memcmp(old_edid->raw_edid,
628 new_edid->raw_edid, new_edid->length) == 0);
629}
630
631static bool wait_for_entering_dp_alt_mode(struct dc_link *link)
632{
633
634 /**
635 * something is terribly wrong if time out is > 200ms. (5Hz)
636 * 500 microseconds * 400 tries us 200 ms
637 **/
638 unsigned int sleep_time_in_microseconds = 500;
639 unsigned int tries_allowed = 400;
640 bool is_in_alt_mode;
641 unsigned long long enter_timestamp;
642 unsigned long long finish_timestamp;
643 unsigned long long time_taken_in_ns;
644 int tries_taken;
645
646 DC_LOGGER_INIT(link->ctx->logger);
647
648 /**
649 * this function will only exist if we are on dcn21 (is_in_alt_mode is a
650 * function pointer, so checking to see if it is equal to 0 is the same
651 * as checking to see if it is null
652 **/
653 if (!link->link_enc->funcs->is_in_alt_mode)
654 return true;
655
656 is_in_alt_mode = link->link_enc->funcs->is_in_alt_mode(link->link_enc);
657 DC_LOG_DC("DP Alt mode state on HPD: %d\n", is_in_alt_mode);
658
659 if (is_in_alt_mode)
660 return true;
661
662 enter_timestamp = dm_get_timestamp(link->ctx);
663
664 for (tries_taken = 0; tries_taken < tries_allowed; tries_taken++) {
665 udelay(sleep_time_in_microseconds);
666 /* ask the link if alt mode is enabled, if so return ok */
667 if (link->link_enc->funcs->is_in_alt_mode(link->link_enc)) {
668 finish_timestamp = dm_get_timestamp(link->ctx);
669 time_taken_in_ns =
670 dm_get_elapse_time_in_ns(link->ctx,
671 finish_timestamp,
672 enter_timestamp);
673 DC_LOG_WARNING("Alt mode entered finished after %llu ms\n",
674 div_u64(time_taken_in_ns, 1000000));
675 return true;
676 }
677 }
678 finish_timestamp = dm_get_timestamp(link->ctx);
679 time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp,
680 enter_timestamp);
681 DC_LOG_WARNING("Alt mode has timed out after %llu ms\n",
682 div_u64(time_taken_in_ns, 1000000));
683 return false;
684}
685
686static void apply_dpia_mst_dsc_always_on_wa(struct dc_link *link)
687{
688 /* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock
689 * reports DSC support.
690 */
691 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
692 link->type == dc_connection_mst_branch &&
693 link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
694 link->dpcd_caps.branch_hw_revision == DP_BRANCH_HW_REV_20 &&
695 link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
696 !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around)
697 link->wa_flags.dpia_mst_dsc_always_on = true;
698
699 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
700 link->type == dc_connection_mst_branch &&
701 link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
702 link->dpcd_caps.branch_vendor_specific_data[2] == MST_HUB_ID_0x5A &&
703 link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
704 !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) {
705 link->wa_flags.dpia_mst_dsc_always_on = true;
706 }
707}
708
709static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link)
710{
711 /* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */
712 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
713 link->wa_flags.dpia_mst_dsc_always_on = false;
714}
715
716static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason reason)
717{
718 DC_LOGGER_INIT(link->ctx->logger);
719
720 LINK_INFO("link=%d, mst branch is now Connected\n",
721 link->link_index);
722
723 link->type = dc_connection_mst_branch;
724 apply_dpia_mst_dsc_always_on_wa(link);
725
726 dm_helpers_dp_update_branch_info(link->ctx, link);
727 if (dm_helpers_dp_mst_start_top_mgr(link->ctx,
728 link, (reason == DETECT_REASON_BOOT || reason == DETECT_REASON_RESUMEFROMS3S4))) {
729 link_disconnect_sink(link);
730 } else {
731 link->type = dc_connection_sst_branch;
732 }
733
734 return link->type == dc_connection_mst_branch;
735}
736
737bool link_reset_cur_dp_mst_topology(struct dc_link *link)
738{
739 DC_LOGGER_INIT(link->ctx->logger);
740
741 LINK_INFO("link=%d, mst branch is now Disconnected\n",
742 link->link_index);
743
744 revert_dpia_mst_dsc_always_on_wa(link);
745 return dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
746}
747
748static bool should_prepare_phy_clocks_for_link_verification(const struct dc *dc,
749 enum dc_detect_reason reason)
750{
751 int i;
752 bool can_apply_seamless_boot = false;
753
754 for (i = 0; i < dc->current_state->stream_count; i++) {
755 if (dc->current_state->streams[i]->apply_seamless_boot_optimization) {
756 can_apply_seamless_boot = true;
757 break;
758 }
759 }
760
761 return !can_apply_seamless_boot && reason != DETECT_REASON_BOOT;
762}
763
764static void prepare_phy_clocks_for_destructive_link_verification(const struct dc *dc)
765{
766 dc_z10_restore(dc);
767 clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr);
768}
769
770static void restore_phy_clocks_for_destructive_link_verification(const struct dc *dc)
771{
772 clk_mgr_optimize_pwr_state(dc, dc->clk_mgr);
773}
774
775static void verify_link_capability_destructive(struct dc_link *link,
776 struct dc_sink *sink,
777 enum dc_detect_reason reason)
778{
779 bool should_prepare_phy_clocks =
780 should_prepare_phy_clocks_for_link_verification(link->dc, reason);
781
782 if (should_prepare_phy_clocks)
783 prepare_phy_clocks_for_destructive_link_verification(link->dc);
784
785 if (dc_is_dp_signal(link->local_sink->sink_signal)) {
786 struct dc_link_settings known_limit_link_setting =
787 dp_get_max_link_cap(link);
788 link_set_all_streams_dpms_off_for_link(link);
789 dp_verify_link_cap_with_retries(
790 link, &known_limit_link_setting,
791 LINK_TRAINING_MAX_VERIFY_RETRY);
792 } else {
793 ASSERT(0);
794 }
795
796 if (should_prepare_phy_clocks)
797 restore_phy_clocks_for_destructive_link_verification(link->dc);
798}
799
800static void verify_link_capability_non_destructive(struct dc_link *link)
801{
802 if (dc_is_dp_signal(link->local_sink->sink_signal)) {
803 if (dc_is_embedded_signal(link->local_sink->sink_signal) ||
804 link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
805 /* TODO - should we check link encoder's max link caps here?
806 * How do we know which link encoder to check from?
807 */
808 link->verified_link_cap = link->reported_link_cap;
809 else
810 link->verified_link_cap = dp_get_max_link_cap(link);
811 }
812}
813
814static bool should_verify_link_capability_destructively(struct dc_link *link,
815 enum dc_detect_reason reason)
816{
817 bool destrictive = false;
818 struct dc_link_settings max_link_cap;
819 bool is_link_enc_unavailable = link->link_enc &&
820 link->dc->res_pool->funcs->link_encs_assign &&
821 !link_enc_cfg_is_link_enc_avail(
822 link->ctx->dc,
823 link->link_enc->preferred_engine,
824 link);
825
826 if (dc_is_dp_signal(link->local_sink->sink_signal)) {
827 max_link_cap = dp_get_max_link_cap(link);
828 destrictive = true;
829
830 if (link->dc->debug.skip_detection_link_training ||
831 dc_is_embedded_signal(link->local_sink->sink_signal) ||
832 link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) {
833 destrictive = false;
834 } else if (link_dp_get_encoding_format(&max_link_cap) ==
835 DP_8b_10b_ENCODING) {
836 if (link->dpcd_caps.is_mst_capable ||
837 is_link_enc_unavailable) {
838 destrictive = false;
839 }
840 }
841 }
842
843 return destrictive;
844}
845
846static void verify_link_capability(struct dc_link *link, struct dc_sink *sink,
847 enum dc_detect_reason reason)
848{
849 if (should_verify_link_capability_destructively(link, reason))
850 verify_link_capability_destructive(link, sink, reason);
851 else
852 verify_link_capability_non_destructive(link);
853}
854
855/*
856 * detect_link_and_local_sink() - Detect if a sink is attached to a given link
857 *
858 * link->local_sink is created or destroyed as needed.
859 *
860 * This does not create remote sinks.
861 */
862static bool detect_link_and_local_sink(struct dc_link *link,
863 enum dc_detect_reason reason)
864{
865 struct dc_sink_init_data sink_init_data = { 0 };
866 struct display_sink_capability sink_caps = { 0 };
867 uint32_t i;
868 bool converter_disable_audio = false;
869 struct audio_support *aud_support = &link->dc->res_pool->audio_support;
870 bool same_edid = false;
871 enum dc_edid_status edid_status;
872 struct dc_context *dc_ctx = link->ctx;
873 struct dc *dc = dc_ctx->dc;
874 struct dc_sink *sink = NULL;
875 struct dc_sink *prev_sink = NULL;
876 struct dpcd_caps prev_dpcd_caps;
877 enum dc_connection_type new_connection_type = dc_connection_none;
878 const uint32_t post_oui_delay = 30; // 30ms
879
880 DC_LOGGER_INIT(link->ctx->logger);
881
882 if (dc_is_virtual_signal(link->connector_signal))
883 return false;
884
885 if (((link->connector_signal == SIGNAL_TYPE_LVDS ||
886 link->connector_signal == SIGNAL_TYPE_EDP) &&
887 (!link->dc->config.allow_edp_hotplug_detection)) &&
888 link->local_sink) {
889 // need to re-write OUI and brightness in resume case
890 if (link->connector_signal == SIGNAL_TYPE_EDP &&
891 (link->dpcd_sink_ext_caps.bits.oled == 1)) {
892 dpcd_set_source_specific_data(link);
893 msleep(post_oui_delay);
894 set_default_brightness_aux(link);
895 }
896
897 return true;
898 }
899
900 if (!link_detect_connection_type(link, &new_connection_type)) {
901 BREAK_TO_DEBUGGER();
902 return false;
903 }
904
905 prev_sink = link->local_sink;
906 if (prev_sink) {
907 dc_sink_retain(prev_sink);
908 memcpy(&prev_dpcd_caps, &link->dpcd_caps, sizeof(struct dpcd_caps));
909 }
910
911 link_disconnect_sink(link);
912 if (new_connection_type != dc_connection_none) {
913 link->type = new_connection_type;
914 link->link_state_valid = false;
915
916 /* From Disconnected-to-Connected. */
917 switch (link->connector_signal) {
918 case SIGNAL_TYPE_HDMI_TYPE_A: {
919 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
920 if (aud_support->hdmi_audio_native)
921 sink_caps.signal = SIGNAL_TYPE_HDMI_TYPE_A;
922 else
923 sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
924 break;
925 }
926
927 case SIGNAL_TYPE_DVI_SINGLE_LINK: {
928 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
929 sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
930 break;
931 }
932
933 case SIGNAL_TYPE_DVI_DUAL_LINK: {
934 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
935 sink_caps.signal = SIGNAL_TYPE_DVI_DUAL_LINK;
936 break;
937 }
938
939 case SIGNAL_TYPE_LVDS: {
940 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
941 sink_caps.signal = SIGNAL_TYPE_LVDS;
942 break;
943 }
944
945 case SIGNAL_TYPE_EDP: {
946 detect_edp_sink_caps(link);
947 read_current_link_settings_on_detect(link);
948
949 /* Disable power sequence on MIPI panel + converter
950 */
951 if (dc->config.enable_mipi_converter_optimization &&
952 dc_ctx->dce_version == DCN_VERSION_3_01 &&
953 link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_0022B9 &&
954 memcmp(&link->dpcd_caps.branch_dev_name, DP_SINK_BRANCH_DEV_NAME_7580,
955 sizeof(link->dpcd_caps.branch_dev_name)) == 0) {
956 dc->config.edp_no_power_sequencing = true;
957
958 if (!link->dpcd_caps.set_power_state_capable_edp)
959 link->wa_flags.dp_keep_receiver_powered = true;
960 }
961
962 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
963 sink_caps.signal = SIGNAL_TYPE_EDP;
964 break;
965 }
966
967 case SIGNAL_TYPE_DISPLAY_PORT: {
968
969 /* wa HPD high coming too early*/
970 if (link->ep_type == DISPLAY_ENDPOINT_PHY &&
971 link->link_enc->features.flags.bits.DP_IS_USB_C == 1) {
972
973 /* if alt mode times out, return false */
974 if (!wait_for_entering_dp_alt_mode(link))
975 return false;
976 }
977
978 if (!detect_dp(link, &sink_caps, reason)) {
979
980 if (prev_sink)
981 dc_sink_release(prev_sink);
982 return false;
983 }
984
985 /* Active SST downstream branch device unplug*/
986 if (link->type == dc_connection_sst_branch &&
987 link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
988 if (prev_sink)
989 /* Downstream unplug */
990 dc_sink_release(prev_sink);
991 return true;
992 }
993
994 /* disable audio for non DP to HDMI active sst converter */
995 if (link->type == dc_connection_sst_branch &&
996 is_dp_active_dongle(link) &&
997 (link->dpcd_caps.dongle_type !=
998 DISPLAY_DONGLE_DP_HDMI_CONVERTER))
999 converter_disable_audio = true;
1000
1001 /* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
1002 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
1003 link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
1004 link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
1005
1006 /*
1007 * If this is DP over USB4 link then we need to:
1008 * - Enable BW ALLOC support on DPtx if applicable
1009 */
1010 if (dc->config.usb4_bw_alloc_support) {
1011 if (link_dp_dpia_set_dptx_usb4_bw_alloc_support(link)) {
1012 /* update with non reduced link cap if bw allocation mode is supported */
1013 if (link->dpia_bw_alloc_config.nrd_max_link_rate &&
1014 link->dpia_bw_alloc_config.nrd_max_lane_count) {
1015 link->reported_link_cap.link_rate =
1016 link->dpia_bw_alloc_config.nrd_max_link_rate;
1017 link->reported_link_cap.lane_count =
1018 link->dpia_bw_alloc_config.nrd_max_lane_count;
1019 }
1020 }
1021 }
1022 break;
1023 }
1024
1025 default:
1026 DC_ERROR("Invalid connector type! signal:%d\n",
1027 link->connector_signal);
1028 if (prev_sink)
1029 dc_sink_release(prev_sink);
1030 return false;
1031 } /* switch() */
1032
1033 if (link->dpcd_caps.sink_count.bits.SINK_COUNT)
1034 link->dpcd_sink_count =
1035 link->dpcd_caps.sink_count.bits.SINK_COUNT;
1036 else
1037 link->dpcd_sink_count = 1;
1038
1039 set_ddc_transaction_type(link->ddc,
1040 sink_caps.transaction_type);
1041
1042 link->aux_mode =
1043 link_is_in_aux_transaction_mode(link->ddc);
1044
1045 sink_init_data.link = link;
1046 sink_init_data.sink_signal = sink_caps.signal;
1047
1048 sink = dc_sink_create(&sink_init_data);
1049 if (!sink) {
1050 DC_ERROR("Failed to create sink!\n");
1051 if (prev_sink)
1052 dc_sink_release(prev_sink);
1053 return false;
1054 }
1055
1056 sink->link->dongle_max_pix_clk = sink_caps.max_hdmi_pixel_clock;
1057 sink->converter_disable_audio = converter_disable_audio;
1058
1059 /* dc_sink_create returns a new reference */
1060 link->local_sink = sink;
1061
1062 edid_status = dm_helpers_read_local_edid(link->ctx,
1063 link, sink);
1064
1065 switch (edid_status) {
1066 case EDID_BAD_CHECKSUM:
1067 DC_LOG_ERROR("EDID checksum invalid.\n");
1068 break;
1069 case EDID_PARTIAL_VALID:
1070 DC_LOG_ERROR("Partial EDID valid, abandon invalid blocks.\n");
1071 break;
1072 case EDID_NO_RESPONSE:
1073 DC_LOG_ERROR("No EDID read.\n");
1074 /*
1075 * Abort detection for non-DP connectors if we have
1076 * no EDID
1077 *
1078 * DP needs to report as connected if HDP is high
1079 * even if we have no EDID in order to go to
1080 * fail-safe mode
1081 */
1082 if (dc_is_hdmi_signal(link->connector_signal) ||
1083 dc_is_dvi_signal(link->connector_signal)) {
1084 if (prev_sink)
1085 dc_sink_release(prev_sink);
1086
1087 return false;
1088 }
1089
1090 if (link->type == dc_connection_sst_branch &&
1091 link->dpcd_caps.dongle_type ==
1092 DISPLAY_DONGLE_DP_VGA_CONVERTER &&
1093 reason == DETECT_REASON_HPDRX) {
1094 /* Abort detection for DP-VGA adapters when EDID
1095 * can't be read and detection reason is VGA-side
1096 * hotplug
1097 */
1098 if (prev_sink)
1099 dc_sink_release(prev_sink);
1100 link_disconnect_sink(link);
1101
1102 return true;
1103 }
1104
1105 break;
1106 default:
1107 break;
1108 }
1109
1110 // Check if edid is the same
1111 if ((prev_sink) &&
1112 (edid_status == EDID_THE_SAME || edid_status == EDID_OK))
1113 same_edid = is_same_edid(&prev_sink->dc_edid,
1114 &sink->dc_edid);
1115
1116 if (sink->edid_caps.panel_patch.skip_scdc_overwrite)
1117 link->ctx->dc->debug.hdmi20_disable = true;
1118
1119 if (sink->edid_caps.panel_patch.remove_sink_ext_caps)
1120 link->dpcd_sink_ext_caps.raw = 0;
1121
1122 if (dc_is_hdmi_signal(link->connector_signal))
1123 read_scdc_caps(link->ddc, link->local_sink);
1124
1125 if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
1126 sink_caps.transaction_type ==
1127 DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
1128 /*
1129 * TODO debug why certain monitors don't like
1130 * two link trainings
1131 */
1132 query_hdcp_capability(sink->sink_signal, link);
1133 } else {
1134 // If edid is the same, then discard new sink and revert back to original sink
1135 if (same_edid) {
1136 link_disconnect_remap(prev_sink, link);
1137 sink = prev_sink;
1138 prev_sink = NULL;
1139 }
1140 query_hdcp_capability(sink->sink_signal, link);
1141 }
1142
1143 /* HDMI-DVI Dongle */
1144 if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A &&
1145 !sink->edid_caps.edid_hdmi)
1146 sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
1147
1148 if (link->local_sink && dc_is_dp_signal(sink_caps.signal))
1149 dp_trace_init(link);
1150
1151 /* Connectivity log: detection */
1152 for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) {
1153 CONN_DATA_DETECT(link,
1154 &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
1155 DC_EDID_BLOCK_SIZE,
1156 "%s: [Block %d] ", sink->edid_caps.display_name, i);
1157 }
1158
1159 DC_LOG_DETECTION_EDID_PARSER("%s: "
1160 "manufacturer_id = %X, "
1161 "product_id = %X, "
1162 "serial_number = %X, "
1163 "manufacture_week = %d, "
1164 "manufacture_year = %d, "
1165 "display_name = %s, "
1166 "speaker_flag = %d, "
1167 "audio_mode_count = %d\n",
1168 __func__,
1169 sink->edid_caps.manufacturer_id,
1170 sink->edid_caps.product_id,
1171 sink->edid_caps.serial_number,
1172 sink->edid_caps.manufacture_week,
1173 sink->edid_caps.manufacture_year,
1174 sink->edid_caps.display_name,
1175 sink->edid_caps.speaker_flags,
1176 sink->edid_caps.audio_mode_count);
1177
1178 for (i = 0; i < sink->edid_caps.audio_mode_count; i++) {
1179 DC_LOG_DETECTION_EDID_PARSER("%s: mode number = %d, "
1180 "format_code = %d, "
1181 "channel_count = %d, "
1182 "sample_rate = %d, "
1183 "sample_size = %d\n",
1184 __func__,
1185 i,
1186 sink->edid_caps.audio_modes[i].format_code,
1187 sink->edid_caps.audio_modes[i].channel_count,
1188 sink->edid_caps.audio_modes[i].sample_rate,
1189 sink->edid_caps.audio_modes[i].sample_size);
1190 }
1191
1192 if (link->connector_signal == SIGNAL_TYPE_EDP) {
1193 // Init dc_panel_config by HW config
1194 if (dc_ctx->dc->res_pool->funcs->get_panel_config_defaults)
1195 dc_ctx->dc->res_pool->funcs->get_panel_config_defaults(&link->panel_config);
1196 // Pickup base DM settings
1197 dm_helpers_init_panel_settings(dc_ctx, &link->panel_config, sink);
1198 // Override dc_panel_config if system has specific settings
1199 dm_helpers_override_panel_settings(dc_ctx, &link->panel_config);
1200
1201 //sink only can use supported link rate table, we are foreced to enable it
1202 if (link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN)
1203 link->panel_config.ilr.optimize_edp_link_rate = true;
1204 link->reported_link_cap.link_rate = get_max_edp_link_rate(link);
1205 }
1206
1207 } else {
1208 /* From Connected-to-Disconnected. */
1209 link->type = dc_connection_none;
1210 sink_caps.signal = SIGNAL_TYPE_NONE;
1211 memset(&link->hdcp_caps, 0, sizeof(struct hdcp_caps));
1212 /* When we unplug a passive DP-HDMI dongle connection, dongle_max_pix_clk
1213 * is not cleared. If we emulate a DP signal on this connection, it thinks
1214 * the dongle is still there and limits the number of modes we can emulate.
1215 * Clear dongle_max_pix_clk on disconnect to fix this
1216 */
1217 link->dongle_max_pix_clk = 0;
1218
1219 dc_link_clear_dprx_states(link);
1220 dp_trace_reset(link);
1221 }
1222
1223 LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p edid same=%d\n",
1224 link->link_index, sink,
1225 (sink_caps.signal ==
1226 SIGNAL_TYPE_NONE ? "Disconnected" : "Connected"),
1227 prev_sink, same_edid);
1228
1229 if (prev_sink)
1230 dc_sink_release(prev_sink);
1231
1232 return true;
1233}
1234
1235/*
1236 * link_detect_connection_type() - Determine if there is a sink connected
1237 *
1238 * @type: Returned connection type
1239 * Does not detect downstream devices, such as MST sinks
1240 * or display connected through active dongles
1241 */
1242bool link_detect_connection_type(struct dc_link *link, enum dc_connection_type *type)
1243{
1244 uint32_t is_hpd_high = 0;
1245
1246 if (link->connector_signal == SIGNAL_TYPE_LVDS) {
1247 *type = dc_connection_single;
1248 return true;
1249 }
1250
1251 if (link->connector_signal == SIGNAL_TYPE_EDP) {
1252 /*in case it is not on*/
1253 if (!link->dc->config.edp_no_power_sequencing)
1254 link->dc->hwss.edp_power_control(link, true);
1255 link->dc->hwss.edp_wait_for_hpd_ready(link, true);
1256 }
1257
1258 /* Link may not have physical HPD pin. */
1259 if (link->ep_type != DISPLAY_ENDPOINT_PHY) {
1260 if (link->is_hpd_pending || !dpia_query_hpd_status(link))
1261 *type = dc_connection_none;
1262 else
1263 *type = dc_connection_single;
1264
1265 return true;
1266 }
1267
1268
1269 if (!query_hpd_status(link, &is_hpd_high))
1270 goto hpd_gpio_failure;
1271
1272 if (is_hpd_high) {
1273 *type = dc_connection_single;
1274 /* TODO: need to do the actual detection */
1275 } else {
1276 *type = dc_connection_none;
1277 if (link->connector_signal == SIGNAL_TYPE_EDP) {
1278 /* eDP is not connected, power down it */
1279 if (!link->dc->config.edp_no_power_sequencing)
1280 link->dc->hwss.edp_power_control(link, false);
1281 }
1282 }
1283
1284 return true;
1285
1286hpd_gpio_failure:
1287 return false;
1288}
1289
1290bool link_detect(struct dc_link *link, enum dc_detect_reason reason)
1291{
1292 bool is_local_sink_detect_success;
1293 bool is_delegated_to_mst_top_mgr = false;
1294 enum dc_connection_type pre_link_type = link->type;
1295
1296 DC_LOGGER_INIT(link->ctx->logger);
1297
1298 is_local_sink_detect_success = detect_link_and_local_sink(link, reason);
1299
1300 if (is_local_sink_detect_success && link->local_sink)
1301 verify_link_capability(link, link->local_sink, reason);
1302
1303 DC_LOG_DC("%s: link_index=%d is_local_sink_detect_success=%d pre_link_type=%d link_type=%d\n", __func__,
1304 link->link_index, is_local_sink_detect_success, pre_link_type, link->type);
1305
1306 if (is_local_sink_detect_success && link->local_sink &&
1307 dc_is_dp_signal(link->local_sink->sink_signal) &&
1308 link->dpcd_caps.is_mst_capable)
1309 is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);
1310
1311 if (pre_link_type == dc_connection_mst_branch &&
1312 link->type != dc_connection_mst_branch)
1313 is_delegated_to_mst_top_mgr = link_reset_cur_dp_mst_topology(link);
1314
1315 return is_local_sink_detect_success && !is_delegated_to_mst_top_mgr;
1316}
1317
1318void link_clear_dprx_states(struct dc_link *link)
1319{
1320 memset(&link->dprx_states, 0, sizeof(link->dprx_states));
1321}
1322
1323bool link_is_hdcp14(struct dc_link *link, enum signal_type signal)
1324{
1325 bool ret = false;
1326
1327 switch (signal) {
1328 case SIGNAL_TYPE_DISPLAY_PORT:
1329 case SIGNAL_TYPE_DISPLAY_PORT_MST:
1330 ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE;
1331 break;
1332 case SIGNAL_TYPE_DVI_SINGLE_LINK:
1333 case SIGNAL_TYPE_DVI_DUAL_LINK:
1334 case SIGNAL_TYPE_HDMI_TYPE_A:
1335 /* HDMI doesn't tell us its HDCP(1.4) capability, so assume to always be capable,
1336 * we can poll for bksv but some displays have an issue with this. Since its so rare
1337 * for a display to not be 1.4 capable, this assumtion is ok
1338 */
1339 ret = true;
1340 break;
1341 default:
1342 break;
1343 }
1344 return ret;
1345}
1346
1347bool link_is_hdcp22(struct dc_link *link, enum signal_type signal)
1348{
1349 bool ret = false;
1350
1351 switch (signal) {
1352 case SIGNAL_TYPE_DISPLAY_PORT:
1353 case SIGNAL_TYPE_DISPLAY_PORT_MST:
1354 ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE &&
1355 link->hdcp_caps.rx_caps.fields.byte0.hdcp_capable &&
1356 (link->hdcp_caps.rx_caps.fields.version == 0x2)) ? 1 : 0;
1357 break;
1358 case SIGNAL_TYPE_DVI_SINGLE_LINK:
1359 case SIGNAL_TYPE_DVI_DUAL_LINK:
1360 case SIGNAL_TYPE_HDMI_TYPE_A:
1361 ret = (link->hdcp_caps.rx_caps.fields.version == 0x4) ? 1:0;
1362 break;
1363 default:
1364 break;
1365 }
1366
1367 return ret;
1368}
1369
1370const struct dc_link_status *link_get_status(const struct dc_link *link)
1371{
1372 return &link->link_status;
1373}
1374
1375
1376static bool link_add_remote_sink_helper(struct dc_link *dc_link, struct dc_sink *sink)
1377{
1378 if (dc_link->sink_count >= MAX_SINKS_PER_LINK) {
1379 BREAK_TO_DEBUGGER();
1380 return false;
1381 }
1382
1383 dc_sink_retain(sink);
1384
1385 dc_link->remote_sinks[dc_link->sink_count] = sink;
1386 dc_link->sink_count++;
1387
1388 return true;
1389}
1390
1391struct dc_sink *link_add_remote_sink(
1392 struct dc_link *link,
1393 const uint8_t *edid,
1394 int len,
1395 struct dc_sink_init_data *init_data)
1396{
1397 struct dc_sink *dc_sink;
1398 enum dc_edid_status edid_status;
1399
1400 if (len > DC_MAX_EDID_BUFFER_SIZE) {
1401 dm_error("Max EDID buffer size breached!\n");
1402 return NULL;
1403 }
1404
1405 if (!init_data) {
1406 BREAK_TO_DEBUGGER();
1407 return NULL;
1408 }
1409
1410 if (!init_data->link) {
1411 BREAK_TO_DEBUGGER();
1412 return NULL;
1413 }
1414
1415 dc_sink = dc_sink_create(init_data);
1416
1417 if (!dc_sink)
1418 return NULL;
1419
1420 memmove(dc_sink->dc_edid.raw_edid, edid, len);
1421 dc_sink->dc_edid.length = len;
1422
1423 if (!link_add_remote_sink_helper(
1424 link,
1425 dc_sink))
1426 goto fail_add_sink;
1427
1428 edid_status = dm_helpers_parse_edid_caps(
1429 link,
1430 &dc_sink->dc_edid,
1431 &dc_sink->edid_caps);
1432
1433 /*
1434 * Treat device as no EDID device if EDID
1435 * parsing fails
1436 */
1437 if (edid_status != EDID_OK && edid_status != EDID_PARTIAL_VALID) {
1438 dc_sink->dc_edid.length = 0;
1439 dm_error("Bad EDID, status%d!\n", edid_status);
1440 }
1441
1442 return dc_sink;
1443
1444fail_add_sink:
1445 dc_sink_release(dc_sink);
1446 return NULL;
1447}
1448
1449void link_remove_remote_sink(struct dc_link *link, struct dc_sink *sink)
1450{
1451 int i;
1452
1453 if (!link->sink_count) {
1454 BREAK_TO_DEBUGGER();
1455 return;
1456 }
1457
1458 for (i = 0; i < link->sink_count; i++) {
1459 if (link->remote_sinks[i] == sink) {
1460 dc_sink_release(sink);
1461 link->remote_sinks[i] = NULL;
1462
1463 /* shrink array to remove empty place */
1464 while (i < link->sink_count - 1) {
1465 link->remote_sinks[i] = link->remote_sinks[i+1];
1466 i++;
1467 }
1468 link->remote_sinks[i] = NULL;
1469 link->sink_count--;
1470 return;
1471 }
1472 }
1473}