2 * Copyright 2007-8 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
23 * Authors: Dave Airlie
28 #include <drm/amdgpu_drm.h>
32 #include "atom-bits.h"
33 #include "atombios_encoders.h"
34 #include "atombios_dp.h"
35 #include "amdgpu_connectors.h"
36 #include "amdgpu_atombios.h"
37 #include <drm/drm_dp_helper.h>
39 /* move these to drm_dp_helper.c/h */
40 #define DP_LINK_CONFIGURATION_SIZE 9
41 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
43 static char *voltage_names[] = {
44 "0.4V", "0.6V", "0.8V", "1.2V"
46 static char *pre_emph_names[] = {
47 "0dB", "3.5dB", "6dB", "9.5dB"
50 /***** amdgpu AUX functions *****/
52 union aux_channel_transaction {
53 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
54 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
57 static int amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan *chan,
58 u8 *send, int send_bytes,
59 u8 *recv, int recv_size,
62 struct drm_device *dev = chan->dev;
63 struct amdgpu_device *adev = drm_to_adev(dev);
64 union aux_channel_transaction args;
65 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
70 memset(&args, 0, sizeof(args));
72 mutex_lock(&chan->mutex);
74 base = (unsigned char *)(adev->mode_info.atom_context->scratch + 1);
76 amdgpu_atombios_copy_swap(base, send, send_bytes, true);
78 args.v2.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
79 args.v2.lpDataOut = cpu_to_le16((u16)(16 + 4));
80 args.v2.ucDataOutLen = 0;
81 args.v2.ucChannelID = chan->rec.i2c_id;
82 args.v2.ucDelay = delay / 10;
83 args.v2.ucHPD_ID = chan->rec.hpd;
85 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
87 *ack = args.v2.ucReplyStatus;
90 if (args.v2.ucReplyStatus == 1) {
96 if (args.v2.ucReplyStatus == 2) {
97 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
103 if (args.v2.ucReplyStatus == 3) {
104 DRM_DEBUG_KMS("dp_aux_ch error\n");
109 recv_bytes = args.v1.ucDataOutLen;
110 if (recv_bytes > recv_size)
111 recv_bytes = recv_size;
113 if (recv && recv_size)
114 amdgpu_atombios_copy_swap(recv, base + 16, recv_bytes, false);
118 mutex_unlock(&chan->mutex);
123 #define BARE_ADDRESS_SIZE 3
124 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
127 amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
129 struct amdgpu_i2c_chan *chan =
130 container_of(aux, struct amdgpu_i2c_chan, aux);
136 if (WARN_ON(msg->size > 16))
139 tx_buf[0] = msg->address & 0xff;
140 tx_buf[1] = msg->address >> 8;
141 tx_buf[2] = (msg->request << 4) |
142 ((msg->address >> 16) & 0xf);
143 tx_buf[3] = msg->size ? (msg->size - 1) : 0;
145 switch (msg->request & ~DP_AUX_I2C_MOT) {
146 case DP_AUX_NATIVE_WRITE:
147 case DP_AUX_I2C_WRITE:
148 /* tx_size needs to be 4 even for bare address packets since the atom
149 * table needs the info in tx_buf[3].
151 tx_size = HEADER_SIZE + msg->size;
153 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
155 tx_buf[3] |= tx_size << 4;
156 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
157 ret = amdgpu_atombios_dp_process_aux_ch(chan,
158 tx_buf, tx_size, NULL, 0, delay, &ack);
160 /* Return payload size. */
163 case DP_AUX_NATIVE_READ:
164 case DP_AUX_I2C_READ:
165 /* tx_size needs to be 4 even for bare address packets since the atom
166 * table needs the info in tx_buf[3].
168 tx_size = HEADER_SIZE;
170 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
172 tx_buf[3] |= tx_size << 4;
173 ret = amdgpu_atombios_dp_process_aux_ch(chan,
174 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
182 msg->reply = ack >> 4;
187 void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector)
189 amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
190 amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
191 drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
192 amdgpu_connector->ddc_bus->has_aux = true;
195 /***** general DP utility functions *****/
197 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3
198 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3
200 static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
208 for (lane = 0; lane < lane_count; lane++) {
209 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
210 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
212 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
214 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
215 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
223 if (v >= DP_VOLTAGE_MAX)
224 v |= DP_TRAIN_MAX_SWING_REACHED;
226 if (p >= DP_PRE_EMPHASIS_MAX)
227 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
229 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
230 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
231 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
233 for (lane = 0; lane < 4; lane++)
234 train_set[lane] = v | p;
237 /* convert bits per color to bits per pixel */
238 /* get bpc from the EDID */
239 static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc)
247 /***** amdgpu specific DP functions *****/
249 static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector,
250 const u8 dpcd[DP_DPCD_SIZE],
252 unsigned *dp_lanes, unsigned *dp_rate)
255 amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector));
256 static const unsigned link_rates[3] = { 162000, 270000, 540000 };
257 unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
258 unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
259 unsigned lane_num, i, max_pix_clock;
261 if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) ==
262 ENCODER_OBJECT_ID_NUTMEG) {
263 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
264 max_pix_clock = (lane_num * 270000 * 8) / bpp;
265 if (max_pix_clock >= pix_clock) {
266 *dp_lanes = lane_num;
272 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
273 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
274 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
275 if (max_pix_clock >= pix_clock) {
276 *dp_lanes = lane_num;
277 *dp_rate = link_rates[i];
287 static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev,
288 int action, int dp_clock,
289 u8 ucconfig, u8 lane_num)
291 DP_ENCODER_SERVICE_PARAMETERS args;
292 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
294 memset(&args, 0, sizeof(args));
295 args.ucLinkClock = dp_clock / 10;
296 args.ucConfig = ucconfig;
297 args.ucAction = action;
298 args.ucLaneNum = lane_num;
301 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
302 return args.ucStatus;
305 u8 amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector *amdgpu_connector)
307 struct drm_device *dev = amdgpu_connector->base.dev;
308 struct amdgpu_device *adev = drm_to_adev(dev);
310 return amdgpu_atombios_dp_encoder_service(adev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
311 amdgpu_connector->ddc_bus->rec.i2c_id, 0);
314 static void amdgpu_atombios_dp_probe_oui(struct amdgpu_connector *amdgpu_connector)
316 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
319 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
322 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
323 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
324 buf[0], buf[1], buf[2]);
326 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
327 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
328 buf[0], buf[1], buf[2]);
331 static void amdgpu_atombios_dp_ds_ports(struct amdgpu_connector *amdgpu_connector)
333 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
336 if (dig_connector->dpcd[DP_DPCD_REV] > 0x10) {
337 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux,
338 DP_DOWNSTREAM_PORT_0,
339 dig_connector->downstream_ports,
340 DP_MAX_DOWNSTREAM_PORTS);
342 memset(dig_connector->downstream_ports, 0,
343 DP_MAX_DOWNSTREAM_PORTS);
347 int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector)
349 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
350 u8 msg[DP_DPCD_SIZE];
353 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV,
355 if (ret == DP_DPCD_SIZE) {
356 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
358 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
359 dig_connector->dpcd);
361 amdgpu_atombios_dp_probe_oui(amdgpu_connector);
362 amdgpu_atombios_dp_ds_ports(amdgpu_connector);
366 dig_connector->dpcd[0] = 0;
370 int amdgpu_atombios_dp_get_panel_mode(struct drm_encoder *encoder,
371 struct drm_connector *connector)
373 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
374 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
375 u16 dp_bridge = amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector);
378 if (!amdgpu_connector->con_priv)
381 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
382 /* DP bridge chips */
383 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
384 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
386 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
387 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
388 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
389 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
391 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
393 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
395 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
396 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
398 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
405 void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector,
406 const struct drm_display_mode *mode)
408 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
409 struct amdgpu_connector_atom_dig *dig_connector;
412 if (!amdgpu_connector->con_priv)
414 dig_connector = amdgpu_connector->con_priv;
416 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
417 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
418 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
420 &dig_connector->dp_lane_count,
421 &dig_connector->dp_clock);
423 dig_connector->dp_clock = 0;
424 dig_connector->dp_lane_count = 0;
429 int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector,
430 struct drm_display_mode *mode)
432 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
433 struct amdgpu_connector_atom_dig *dig_connector;
434 unsigned dp_lanes, dp_clock;
437 if (!amdgpu_connector->con_priv)
438 return MODE_CLOCK_HIGH;
439 dig_connector = amdgpu_connector->con_priv;
441 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
442 mode->clock, &dp_lanes, &dp_clock);
444 return MODE_CLOCK_HIGH;
446 if ((dp_clock == 540000) &&
447 (!amdgpu_connector_is_dp12_capable(connector)))
448 return MODE_CLOCK_HIGH;
453 bool amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector *amdgpu_connector)
455 u8 link_status[DP_LINK_STATUS_SIZE];
456 struct amdgpu_connector_atom_dig *dig = amdgpu_connector->con_priv;
458 if (drm_dp_dpcd_read_link_status(&amdgpu_connector->ddc_bus->aux, link_status)
461 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
466 void amdgpu_atombios_dp_set_rx_power_state(struct drm_connector *connector,
469 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
470 struct amdgpu_connector_atom_dig *dig_connector;
472 if (!amdgpu_connector->con_priv)
475 dig_connector = amdgpu_connector->con_priv;
477 /* power up/down the sink */
478 if (dig_connector->dpcd[0] >= 0x11) {
479 drm_dp_dpcd_writeb(&amdgpu_connector->ddc_bus->aux,
480 DP_SET_POWER, power_state);
481 usleep_range(1000, 2000);
485 struct amdgpu_atombios_dp_link_train_info {
486 struct amdgpu_device *adev;
487 struct drm_encoder *encoder;
488 struct drm_connector *connector;
492 u8 dpcd[DP_RECEIVER_CAP_SIZE];
494 u8 link_status[DP_LINK_STATUS_SIZE];
496 struct drm_dp_aux *aux;
500 amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info *dp_info)
502 /* set the initial vs/emph on the source */
503 amdgpu_atombios_encoder_setup_dig_transmitter(dp_info->encoder,
504 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
505 0, dp_info->train_set[0]); /* sets all lanes at once */
507 /* set the vs/emph on the sink */
508 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
509 dp_info->train_set, dp_info->dp_lane_count);
513 amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info *dp_info, int tp)
517 /* set training pattern on the source */
519 case DP_TRAINING_PATTERN_1:
520 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
522 case DP_TRAINING_PATTERN_2:
523 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
525 case DP_TRAINING_PATTERN_3:
526 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
529 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, rtp, 0);
531 /* enable training pattern on the sink */
532 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
536 amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info *dp_info)
538 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(dp_info->encoder);
539 struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv;
542 /* power up the sink */
543 amdgpu_atombios_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
545 /* possibly enable downspread on the sink */
546 if (dp_info->dpcd[3] & 0x1)
547 drm_dp_dpcd_writeb(dp_info->aux,
548 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
550 drm_dp_dpcd_writeb(dp_info->aux,
551 DP_DOWNSPREAD_CTRL, 0);
553 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
554 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
556 /* set the lane count on the sink */
557 tmp = dp_info->dp_lane_count;
558 if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
559 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
560 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
562 /* set the link rate on the sink */
563 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
564 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
566 /* start training on the source */
567 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
568 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
570 /* disable the training pattern on the sink */
571 drm_dp_dpcd_writeb(dp_info->aux,
572 DP_TRAINING_PATTERN_SET,
573 DP_TRAINING_PATTERN_DISABLE);
579 amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info *dp_info)
583 /* disable the training pattern on the sink */
584 drm_dp_dpcd_writeb(dp_info->aux,
585 DP_TRAINING_PATTERN_SET,
586 DP_TRAINING_PATTERN_DISABLE);
588 /* disable the training pattern on the source */
589 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
590 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
596 amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info *dp_info)
602 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
603 memset(dp_info->train_set, 0, 4);
604 amdgpu_atombios_dp_update_vs_emph(dp_info);
608 /* clock recovery loop */
609 clock_recovery = false;
613 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
615 if (drm_dp_dpcd_read_link_status(dp_info->aux,
616 dp_info->link_status) <= 0) {
617 DRM_ERROR("displayport link status failed\n");
621 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
622 clock_recovery = true;
626 for (i = 0; i < dp_info->dp_lane_count; i++) {
627 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
630 if (i == dp_info->dp_lane_count) {
631 DRM_ERROR("clock recovery reached max voltage\n");
635 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
637 if (dp_info->tries == 5) {
638 DRM_ERROR("clock recovery tried 5 times\n");
644 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
646 /* Compute new train_set as requested by sink */
647 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
650 amdgpu_atombios_dp_update_vs_emph(dp_info);
652 if (!clock_recovery) {
653 DRM_ERROR("clock recovery failed\n");
656 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
657 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
658 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
659 DP_TRAIN_PRE_EMPHASIS_SHIFT);
665 amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info *dp_info)
669 if (dp_info->tp3_supported)
670 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
672 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
674 /* channel equalization loop */
678 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
680 if (drm_dp_dpcd_read_link_status(dp_info->aux,
681 dp_info->link_status) <= 0) {
682 DRM_ERROR("displayport link status failed\n");
686 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
692 if (dp_info->tries > 5) {
693 DRM_ERROR("channel eq failed: 5 tries\n");
697 /* Compute new train_set as requested by sink */
698 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
701 amdgpu_atombios_dp_update_vs_emph(dp_info);
706 DRM_ERROR("channel eq failed\n");
709 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
710 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
711 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
712 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
717 void amdgpu_atombios_dp_link_train(struct drm_encoder *encoder,
718 struct drm_connector *connector)
720 struct drm_device *dev = encoder->dev;
721 struct amdgpu_device *adev = drm_to_adev(dev);
722 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
723 struct amdgpu_connector *amdgpu_connector;
724 struct amdgpu_connector_atom_dig *dig_connector;
725 struct amdgpu_atombios_dp_link_train_info dp_info;
728 if (!amdgpu_encoder->enc_priv)
731 amdgpu_connector = to_amdgpu_connector(connector);
732 if (!amdgpu_connector->con_priv)
734 dig_connector = amdgpu_connector->con_priv;
736 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
737 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
740 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
742 if (tmp & DP_TPS3_SUPPORTED)
743 dp_info.tp3_supported = true;
745 dp_info.tp3_supported = false;
747 dp_info.tp3_supported = false;
750 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
752 dp_info.encoder = encoder;
753 dp_info.connector = connector;
754 dp_info.dp_lane_count = dig_connector->dp_lane_count;
755 dp_info.dp_clock = dig_connector->dp_clock;
756 dp_info.aux = &amdgpu_connector->ddc_bus->aux;
758 if (amdgpu_atombios_dp_link_train_init(&dp_info))
760 if (amdgpu_atombios_dp_link_train_cr(&dp_info))
762 if (amdgpu_atombios_dp_link_train_ce(&dp_info))
765 if (amdgpu_atombios_dp_link_train_finish(&dp_info))