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/radeon_drm.h>
32 #include "atom-bits.h"
33 #include <drm/drm_dp_helper.h>
35 /* move these to drm_dp_helper.c/h */
36 #define DP_LINK_CONFIGURATION_SIZE 9
37 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
39 static char *voltage_names[] = {
40 "0.4V", "0.6V", "0.8V", "1.2V"
42 static char *pre_emph_names[] = {
43 "0dB", "3.5dB", "6dB", "9.5dB"
46 /***** radeon AUX functions *****/
48 /* Atom needs data in little endian format
49 * so swap as appropriate when copying data to
50 * or from atom. Note that atom operates on
53 void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
56 u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */
60 memcpy(src_tmp, src, num_bytes);
61 src32 = (u32 *)src_tmp;
62 dst32 = (u32 *)dst_tmp;
64 for (i = 0; i < ((num_bytes + 3) / 4); i++)
65 dst32[i] = cpu_to_le32(src32[i]);
66 memcpy(dst, dst_tmp, num_bytes);
68 u8 dws = num_bytes & ~3;
69 for (i = 0; i < ((num_bytes + 3) / 4); i++)
70 dst32[i] = le32_to_cpu(src32[i]);
71 memcpy(dst, dst_tmp, dws);
73 for (i = 0; i < (num_bytes % 4); i++)
74 dst[dws+i] = dst_tmp[dws+i];
78 memcpy(dst, src, num_bytes);
82 union aux_channel_transaction {
83 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
84 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
87 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
88 u8 *send, int send_bytes,
89 u8 *recv, int recv_size,
92 struct drm_device *dev = chan->dev;
93 struct radeon_device *rdev = dev->dev_private;
94 union aux_channel_transaction args;
95 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
100 memset(&args, 0, sizeof(args));
102 mutex_lock(&chan->mutex);
103 mutex_lock(&rdev->mode_info.atom_context->scratch_mutex);
105 base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
107 radeon_atom_copy_swap(base, send, send_bytes, true);
109 args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
110 args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
111 args.v1.ucDataOutLen = 0;
112 args.v1.ucChannelID = chan->rec.i2c_id;
113 args.v1.ucDelay = delay / 10;
114 if (ASIC_IS_DCE4(rdev))
115 args.v2.ucHPD_ID = chan->rec.hpd;
117 atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args);
119 *ack = args.v1.ucReplyStatus;
122 if (args.v1.ucReplyStatus == 1) {
123 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
129 if (args.v1.ucReplyStatus == 2) {
130 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
136 if (args.v1.ucReplyStatus == 3) {
137 DRM_DEBUG_KMS("dp_aux_ch error\n");
142 recv_bytes = args.v1.ucDataOutLen;
143 if (recv_bytes > recv_size)
144 recv_bytes = recv_size;
146 if (recv && recv_size)
147 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
151 mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex);
152 mutex_unlock(&chan->mutex);
157 #define BARE_ADDRESS_SIZE 3
158 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
161 radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
163 struct radeon_i2c_chan *chan =
164 container_of(aux, struct radeon_i2c_chan, aux);
170 if (WARN_ON(msg->size > 16))
173 tx_buf[0] = msg->address & 0xff;
174 tx_buf[1] = msg->address >> 8;
175 tx_buf[2] = msg->request << 4;
176 tx_buf[3] = msg->size ? (msg->size - 1) : 0;
178 switch (msg->request & ~DP_AUX_I2C_MOT) {
179 case DP_AUX_NATIVE_WRITE:
180 case DP_AUX_I2C_WRITE:
181 /* tx_size needs to be 4 even for bare address packets since the atom
182 * table needs the info in tx_buf[3].
184 tx_size = HEADER_SIZE + msg->size;
186 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
188 tx_buf[3] |= tx_size << 4;
189 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
190 ret = radeon_process_aux_ch(chan,
191 tx_buf, tx_size, NULL, 0, delay, &ack);
193 /* Return payload size. */
196 case DP_AUX_NATIVE_READ:
197 case DP_AUX_I2C_READ:
198 /* tx_size needs to be 4 even for bare address packets since the atom
199 * table needs the info in tx_buf[3].
201 tx_size = HEADER_SIZE;
203 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
205 tx_buf[3] |= tx_size << 4;
206 ret = radeon_process_aux_ch(chan,
207 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
215 msg->reply = ack >> 4;
220 void radeon_dp_aux_init(struct radeon_connector *radeon_connector)
224 radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
225 radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
226 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer;
228 ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux);
230 radeon_connector->ddc_bus->has_aux = true;
232 WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret);
235 /***** general DP utility functions *****/
237 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3
238 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3
240 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
248 for (lane = 0; lane < lane_count; lane++) {
249 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
250 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
252 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
254 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
255 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
263 if (v >= DP_VOLTAGE_MAX)
264 v |= DP_TRAIN_MAX_SWING_REACHED;
266 if (p >= DP_PRE_EMPHASIS_MAX)
267 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
269 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
270 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
271 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
273 for (lane = 0; lane < 4; lane++)
274 train_set[lane] = v | p;
277 /* convert bits per color to bits per pixel */
278 /* get bpc from the EDID */
279 static int convert_bpc_to_bpp(int bpc)
287 /* get the max pix clock supported by the link rate and lane num */
288 static int dp_get_max_dp_pix_clock(int link_rate,
292 return (link_rate * lane_num * 8) / bpp;
295 /***** radeon specific DP functions *****/
297 static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
298 u8 dpcd[DP_DPCD_SIZE])
302 if (radeon_connector_is_dp12_capable(connector))
303 max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
305 max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
307 return max_link_rate;
310 /* First get the min lane# when low rate is used according to pixel clock
311 * (prefer low rate), second check max lane# supported by DP panel,
312 * if the max lane# < low rate lane# then use max lane# instead.
314 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
315 u8 dpcd[DP_DPCD_SIZE],
318 int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
319 int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
320 int max_lane_num = drm_dp_max_lane_count(dpcd);
322 int max_dp_pix_clock;
324 for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
325 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
326 if (pix_clock <= max_dp_pix_clock)
333 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
334 u8 dpcd[DP_DPCD_SIZE],
337 int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
338 int lane_num, max_pix_clock;
340 if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
341 ENCODER_OBJECT_ID_NUTMEG)
344 lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
345 max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
346 if (pix_clock <= max_pix_clock)
348 max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
349 if (pix_clock <= max_pix_clock)
351 if (radeon_connector_is_dp12_capable(connector)) {
352 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
353 if (pix_clock <= max_pix_clock)
357 return radeon_dp_get_max_link_rate(connector, dpcd);
360 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
361 int action, int dp_clock,
362 u8 ucconfig, u8 lane_num)
364 DP_ENCODER_SERVICE_PARAMETERS args;
365 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
367 memset(&args, 0, sizeof(args));
368 args.ucLinkClock = dp_clock / 10;
369 args.ucConfig = ucconfig;
370 args.ucAction = action;
371 args.ucLaneNum = lane_num;
374 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
375 return args.ucStatus;
378 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
380 struct drm_device *dev = radeon_connector->base.dev;
381 struct radeon_device *rdev = dev->dev_private;
383 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
384 radeon_connector->ddc_bus->rec.i2c_id, 0);
387 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
389 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
392 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
395 if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
396 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
397 buf[0], buf[1], buf[2]);
399 if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
400 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
401 buf[0], buf[1], buf[2]);
404 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
406 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
407 u8 msg[DP_DPCD_SIZE];
410 ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
413 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
415 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
416 dig_connector->dpcd);
418 radeon_dp_probe_oui(radeon_connector);
422 dig_connector->dpcd[0] = 0;
426 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
427 struct drm_connector *connector)
429 struct drm_device *dev = encoder->dev;
430 struct radeon_device *rdev = dev->dev_private;
431 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
432 struct radeon_connector_atom_dig *dig_connector;
433 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
434 u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
437 if (!ASIC_IS_DCE4(rdev))
440 if (!radeon_connector->con_priv)
443 dig_connector = radeon_connector->con_priv;
445 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
446 /* DP bridge chips */
447 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
448 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
450 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
451 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
452 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
453 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
455 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
457 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
459 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
460 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
462 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
469 void radeon_dp_set_link_config(struct drm_connector *connector,
470 const struct drm_display_mode *mode)
472 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
473 struct radeon_connector_atom_dig *dig_connector;
475 if (!radeon_connector->con_priv)
477 dig_connector = radeon_connector->con_priv;
479 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
480 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
481 dig_connector->dp_clock =
482 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
483 dig_connector->dp_lane_count =
484 radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
488 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
489 struct drm_display_mode *mode)
491 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
492 struct radeon_connector_atom_dig *dig_connector;
495 if ((mode->clock > 340000) &&
496 (!radeon_connector_is_dp12_capable(connector)))
497 return MODE_CLOCK_HIGH;
499 if (!radeon_connector->con_priv)
500 return MODE_CLOCK_HIGH;
501 dig_connector = radeon_connector->con_priv;
504 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
506 if ((dp_clock == 540000) &&
507 (!radeon_connector_is_dp12_capable(connector)))
508 return MODE_CLOCK_HIGH;
513 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
515 u8 link_status[DP_LINK_STATUS_SIZE];
516 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
518 if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status)
521 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
526 void radeon_dp_set_rx_power_state(struct drm_connector *connector,
529 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
530 struct radeon_connector_atom_dig *dig_connector;
532 if (!radeon_connector->con_priv)
535 dig_connector = radeon_connector->con_priv;
537 /* power up/down the sink */
538 if (dig_connector->dpcd[0] >= 0x11) {
539 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux,
540 DP_SET_POWER, power_state);
541 usleep_range(1000, 2000);
546 struct radeon_dp_link_train_info {
547 struct radeon_device *rdev;
548 struct drm_encoder *encoder;
549 struct drm_connector *connector;
554 u8 dpcd[DP_RECEIVER_CAP_SIZE];
556 u8 link_status[DP_LINK_STATUS_SIZE];
559 struct drm_dp_aux *aux;
562 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
564 /* set the initial vs/emph on the source */
565 atombios_dig_transmitter_setup(dp_info->encoder,
566 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
567 0, dp_info->train_set[0]); /* sets all lanes at once */
569 /* set the vs/emph on the sink */
570 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
571 dp_info->train_set, dp_info->dp_lane_count);
574 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
578 /* set training pattern on the source */
579 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
581 case DP_TRAINING_PATTERN_1:
582 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
584 case DP_TRAINING_PATTERN_2:
585 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
587 case DP_TRAINING_PATTERN_3:
588 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
591 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
594 case DP_TRAINING_PATTERN_1:
597 case DP_TRAINING_PATTERN_2:
601 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
602 dp_info->dp_clock, dp_info->enc_id, rtp);
605 /* enable training pattern on the sink */
606 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
609 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
611 struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
612 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
615 /* power up the sink */
616 radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
618 /* possibly enable downspread on the sink */
619 if (dp_info->dpcd[3] & 0x1)
620 drm_dp_dpcd_writeb(dp_info->aux,
621 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
623 drm_dp_dpcd_writeb(dp_info->aux,
624 DP_DOWNSPREAD_CTRL, 0);
626 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
627 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
629 /* set the lane count on the sink */
630 tmp = dp_info->dp_lane_count;
631 if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
632 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
633 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
635 /* set the link rate on the sink */
636 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
637 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
639 /* start training on the source */
640 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
641 atombios_dig_encoder_setup(dp_info->encoder,
642 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
644 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
645 dp_info->dp_clock, dp_info->enc_id, 0);
647 /* disable the training pattern on the sink */
648 drm_dp_dpcd_writeb(dp_info->aux,
649 DP_TRAINING_PATTERN_SET,
650 DP_TRAINING_PATTERN_DISABLE);
655 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
659 /* disable the training pattern on the sink */
660 drm_dp_dpcd_writeb(dp_info->aux,
661 DP_TRAINING_PATTERN_SET,
662 DP_TRAINING_PATTERN_DISABLE);
664 /* disable the training pattern on the source */
665 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
666 atombios_dig_encoder_setup(dp_info->encoder,
667 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
669 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
670 dp_info->dp_clock, dp_info->enc_id, 0);
675 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
681 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
682 memset(dp_info->train_set, 0, 4);
683 radeon_dp_update_vs_emph(dp_info);
687 /* clock recovery loop */
688 clock_recovery = false;
692 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
694 if (drm_dp_dpcd_read_link_status(dp_info->aux,
695 dp_info->link_status) <= 0) {
696 DRM_ERROR("displayport link status failed\n");
700 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
701 clock_recovery = true;
705 for (i = 0; i < dp_info->dp_lane_count; i++) {
706 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
709 if (i == dp_info->dp_lane_count) {
710 DRM_ERROR("clock recovery reached max voltage\n");
714 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
716 if (dp_info->tries == 5) {
717 DRM_ERROR("clock recovery tried 5 times\n");
723 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
725 /* Compute new train_set as requested by sink */
726 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
728 radeon_dp_update_vs_emph(dp_info);
730 if (!clock_recovery) {
731 DRM_ERROR("clock recovery failed\n");
734 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
735 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
736 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
737 DP_TRAIN_PRE_EMPHASIS_SHIFT);
742 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
746 if (dp_info->tp3_supported)
747 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
749 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
751 /* channel equalization loop */
755 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
757 if (drm_dp_dpcd_read_link_status(dp_info->aux,
758 dp_info->link_status) <= 0) {
759 DRM_ERROR("displayport link status failed\n");
763 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
769 if (dp_info->tries > 5) {
770 DRM_ERROR("channel eq failed: 5 tries\n");
774 /* Compute new train_set as requested by sink */
775 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
777 radeon_dp_update_vs_emph(dp_info);
782 DRM_ERROR("channel eq failed\n");
785 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
786 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
787 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
788 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
793 void radeon_dp_link_train(struct drm_encoder *encoder,
794 struct drm_connector *connector)
796 struct drm_device *dev = encoder->dev;
797 struct radeon_device *rdev = dev->dev_private;
798 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
799 struct radeon_encoder_atom_dig *dig;
800 struct radeon_connector *radeon_connector;
801 struct radeon_connector_atom_dig *dig_connector;
802 struct radeon_dp_link_train_info dp_info;
806 if (!radeon_encoder->enc_priv)
808 dig = radeon_encoder->enc_priv;
810 radeon_connector = to_radeon_connector(connector);
811 if (!radeon_connector->con_priv)
813 dig_connector = radeon_connector->con_priv;
815 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
816 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
819 /* DPEncoderService newer than 1.1 can't program properly the
820 * training pattern. When facing such version use the
821 * DIGXEncoderControl (X== 1 | 2)
823 dp_info.use_dpencoder = true;
824 index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
825 if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
827 dp_info.use_dpencoder = false;
832 if (dig->dig_encoder)
833 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
835 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
837 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
839 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
841 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
843 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
844 dp_info.tp3_supported = true;
846 dp_info.tp3_supported = false;
848 dp_info.tp3_supported = false;
851 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
853 dp_info.encoder = encoder;
854 dp_info.connector = connector;
855 dp_info.dp_lane_count = dig_connector->dp_lane_count;
856 dp_info.dp_clock = dig_connector->dp_clock;
857 dp_info.aux = &radeon_connector->ddc_bus->aux;
859 if (radeon_dp_link_train_init(&dp_info))
861 if (radeon_dp_link_train_cr(&dp_info))
863 if (radeon_dp_link_train_ce(&dp_info))
866 if (radeon_dp_link_train_finish(&dp_info))