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27#include <drm/drmP.h>
28#include <drm/radeon_drm.h>
29#include "radeon.h"
30
31#include "atom.h"
32#include "atom-bits.h"
33#include <drm/drm_dp_helper.h>
34
35
36#define DP_LINK_CONFIGURATION_SIZE 9
37#define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
38
39static char *voltage_names[] = {
40 "0.4V", "0.6V", "0.8V", "1.2V"
41};
42static char *pre_emph_names[] = {
43 "0dB", "3.5dB", "6dB", "9.5dB"
44};
45
46
47union aux_channel_transaction {
48 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
49 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
50};
51
52static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
53 u8 *send, int send_bytes,
54 u8 *recv, int recv_size,
55 u8 delay, u8 *ack)
56{
57 struct drm_device *dev = chan->dev;
58 struct radeon_device *rdev = dev->dev_private;
59 union aux_channel_transaction args;
60 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
61 unsigned char *base;
62 int recv_bytes;
63
64 memset(&args, 0, sizeof(args));
65
66 base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
67
68 memcpy(base, send, send_bytes);
69
70 args.v1.lpAuxRequest = 0 + 4;
71 args.v1.lpDataOut = 16 + 4;
72 args.v1.ucDataOutLen = 0;
73 args.v1.ucChannelID = chan->rec.i2c_id;
74 args.v1.ucDelay = delay / 10;
75 if (ASIC_IS_DCE4(rdev))
76 args.v2.ucHPD_ID = chan->rec.hpd;
77
78 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
79
80 *ack = args.v1.ucReplyStatus;
81
82
83 if (args.v1.ucReplyStatus == 1) {
84 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
85 return -ETIMEDOUT;
86 }
87
88
89 if (args.v1.ucReplyStatus == 2) {
90 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
91 return -EBUSY;
92 }
93
94
95 if (args.v1.ucReplyStatus == 3) {
96 DRM_DEBUG_KMS("dp_aux_ch error\n");
97 return -EIO;
98 }
99
100 recv_bytes = args.v1.ucDataOutLen;
101 if (recv_bytes > recv_size)
102 recv_bytes = recv_size;
103
104 if (recv && recv_size)
105 memcpy(recv, base + 16, recv_bytes);
106
107 return recv_bytes;
108}
109
110static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
111 u16 address, u8 *send, u8 send_bytes, u8 delay)
112{
113 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
114 int ret;
115 u8 msg[20];
116 int msg_bytes = send_bytes + 4;
117 u8 ack;
118 unsigned retry;
119
120 if (send_bytes > 16)
121 return -1;
122
123 msg[0] = address;
124 msg[1] = address >> 8;
125 msg[2] = AUX_NATIVE_WRITE << 4;
126 msg[3] = (msg_bytes << 4) | (send_bytes - 1);
127 memcpy(&msg[4], send, send_bytes);
128
129 for (retry = 0; retry < 4; retry++) {
130 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
131 msg, msg_bytes, NULL, 0, delay, &ack);
132 if (ret == -EBUSY)
133 continue;
134 else if (ret < 0)
135 return ret;
136 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
137 return send_bytes;
138 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
139 udelay(400);
140 else
141 return -EIO;
142 }
143
144 return -EIO;
145}
146
147static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
148 u16 address, u8 *recv, int recv_bytes, u8 delay)
149{
150 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
151 u8 msg[4];
152 int msg_bytes = 4;
153 u8 ack;
154 int ret;
155 unsigned retry;
156
157 msg[0] = address;
158 msg[1] = address >> 8;
159 msg[2] = AUX_NATIVE_READ << 4;
160 msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
161
162 for (retry = 0; retry < 4; retry++) {
163 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
164 msg, msg_bytes, recv, recv_bytes, delay, &ack);
165 if (ret == -EBUSY)
166 continue;
167 else if (ret < 0)
168 return ret;
169 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
170 return ret;
171 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
172 udelay(400);
173 else if (ret == 0)
174 return -EPROTO;
175 else
176 return -EIO;
177 }
178
179 return -EIO;
180}
181
182static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
183 u16 reg, u8 val)
184{
185 radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
186}
187
188static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
189 u16 reg)
190{
191 u8 val = 0;
192
193 radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
194
195 return val;
196}
197
198int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
199 u8 write_byte, u8 *read_byte)
200{
201 struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
202 struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
203 u16 address = algo_data->address;
204 u8 msg[5];
205 u8 reply[2];
206 unsigned retry;
207 int msg_bytes;
208 int reply_bytes = 1;
209 int ret;
210 u8 ack;
211
212
213 if (mode & MODE_I2C_READ)
214 msg[2] = AUX_I2C_READ << 4;
215 else
216 msg[2] = AUX_I2C_WRITE << 4;
217
218 if (!(mode & MODE_I2C_STOP))
219 msg[2] |= AUX_I2C_MOT << 4;
220
221 msg[0] = address;
222 msg[1] = address >> 8;
223
224 switch (mode) {
225 case MODE_I2C_WRITE:
226 msg_bytes = 5;
227 msg[3] = msg_bytes << 4;
228 msg[4] = write_byte;
229 break;
230 case MODE_I2C_READ:
231 msg_bytes = 4;
232 msg[3] = msg_bytes << 4;
233 break;
234 default:
235 msg_bytes = 4;
236 msg[3] = 3 << 4;
237 break;
238 }
239
240 for (retry = 0; retry < 4; retry++) {
241 ret = radeon_process_aux_ch(auxch,
242 msg, msg_bytes, reply, reply_bytes, 0, &ack);
243 if (ret == -EBUSY)
244 continue;
245 else if (ret < 0) {
246 DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
247 return ret;
248 }
249
250 switch (ack & AUX_NATIVE_REPLY_MASK) {
251 case AUX_NATIVE_REPLY_ACK:
252
253
254
255 break;
256 case AUX_NATIVE_REPLY_NACK:
257 DRM_DEBUG_KMS("aux_ch native nack\n");
258 return -EREMOTEIO;
259 case AUX_NATIVE_REPLY_DEFER:
260 DRM_DEBUG_KMS("aux_ch native defer\n");
261 udelay(400);
262 continue;
263 default:
264 DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
265 return -EREMOTEIO;
266 }
267
268 switch (ack & AUX_I2C_REPLY_MASK) {
269 case AUX_I2C_REPLY_ACK:
270 if (mode == MODE_I2C_READ)
271 *read_byte = reply[0];
272 return ret;
273 case AUX_I2C_REPLY_NACK:
274 DRM_DEBUG_KMS("aux_i2c nack\n");
275 return -EREMOTEIO;
276 case AUX_I2C_REPLY_DEFER:
277 DRM_DEBUG_KMS("aux_i2c defer\n");
278 udelay(400);
279 break;
280 default:
281 DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
282 return -EREMOTEIO;
283 }
284 }
285
286 DRM_DEBUG_KMS("aux i2c too many retries, giving up\n");
287 return -EREMOTEIO;
288}
289
290
291
292#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_1200
293#define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPHASIS_9_5
294
295static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
296 int lane_count,
297 u8 train_set[4])
298{
299 u8 v = 0;
300 u8 p = 0;
301 int lane;
302
303 for (lane = 0; lane < lane_count; lane++) {
304 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
305 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
306
307 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
308 lane,
309 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
310 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
311
312 if (this_v > v)
313 v = this_v;
314 if (this_p > p)
315 p = this_p;
316 }
317
318 if (v >= DP_VOLTAGE_MAX)
319 v |= DP_TRAIN_MAX_SWING_REACHED;
320
321 if (p >= DP_PRE_EMPHASIS_MAX)
322 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
323
324 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
325 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
326 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
327
328 for (lane = 0; lane < 4; lane++)
329 train_set[lane] = v | p;
330}
331
332
333
334static int convert_bpc_to_bpp(int bpc)
335{
336 if (bpc == 0)
337 return 24;
338 else
339 return bpc * 3;
340}
341
342
343static int dp_get_max_dp_pix_clock(int link_rate,
344 int lane_num,
345 int bpp)
346{
347 return (link_rate * lane_num * 8) / bpp;
348}
349
350
351
352
353
354
355
356static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
357 u8 dpcd[DP_DPCD_SIZE],
358 int pix_clock)
359{
360 int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
361 int max_link_rate = drm_dp_max_link_rate(dpcd);
362 int max_lane_num = drm_dp_max_lane_count(dpcd);
363 int lane_num;
364 int max_dp_pix_clock;
365
366 for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
367 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
368 if (pix_clock <= max_dp_pix_clock)
369 break;
370 }
371
372 return lane_num;
373}
374
375static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
376 u8 dpcd[DP_DPCD_SIZE],
377 int pix_clock)
378{
379 int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
380 int lane_num, max_pix_clock;
381
382 if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
383 ENCODER_OBJECT_ID_NUTMEG)
384 return 270000;
385
386 lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
387 max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
388 if (pix_clock <= max_pix_clock)
389 return 162000;
390 max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
391 if (pix_clock <= max_pix_clock)
392 return 270000;
393 if (radeon_connector_is_dp12_capable(connector)) {
394 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
395 if (pix_clock <= max_pix_clock)
396 return 540000;
397 }
398
399 return drm_dp_max_link_rate(dpcd);
400}
401
402static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
403 int action, int dp_clock,
404 u8 ucconfig, u8 lane_num)
405{
406 DP_ENCODER_SERVICE_PARAMETERS args;
407 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
408
409 memset(&args, 0, sizeof(args));
410 args.ucLinkClock = dp_clock / 10;
411 args.ucConfig = ucconfig;
412 args.ucAction = action;
413 args.ucLaneNum = lane_num;
414 args.ucStatus = 0;
415
416 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
417 return args.ucStatus;
418}
419
420u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
421{
422 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
423 struct drm_device *dev = radeon_connector->base.dev;
424 struct radeon_device *rdev = dev->dev_private;
425
426 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
427 dig_connector->dp_i2c_bus->rec.i2c_id, 0);
428}
429
430static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
431{
432 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
433 u8 buf[3];
434
435 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
436 return;
437
438 if (radeon_dp_aux_native_read(radeon_connector, DP_SINK_OUI, buf, 3, 0))
439 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
440 buf[0], buf[1], buf[2]);
441
442 if (radeon_dp_aux_native_read(radeon_connector, DP_BRANCH_OUI, buf, 3, 0))
443 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
444 buf[0], buf[1], buf[2]);
445}
446
447bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
448{
449 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
450 u8 msg[DP_DPCD_SIZE];
451 int ret, i;
452
453 ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg,
454 DP_DPCD_SIZE, 0);
455 if (ret > 0) {
456 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
457 DRM_DEBUG_KMS("DPCD: ");
458 for (i = 0; i < DP_DPCD_SIZE; i++)
459 DRM_DEBUG_KMS("%02x ", msg[i]);
460 DRM_DEBUG_KMS("\n");
461
462 radeon_dp_probe_oui(radeon_connector);
463
464 return true;
465 }
466 dig_connector->dpcd[0] = 0;
467 return false;
468}
469
470int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
471 struct drm_connector *connector)
472{
473 struct drm_device *dev = encoder->dev;
474 struct radeon_device *rdev = dev->dev_private;
475 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
476 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
477 u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
478 u8 tmp;
479
480 if (!ASIC_IS_DCE4(rdev))
481 return panel_mode;
482
483 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
484
485 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
486 if (tmp & 1)
487 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
488 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
489 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
490 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
491 else
492 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
493 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
494
495 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
496 if (tmp & 1)
497 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
498 }
499
500 return panel_mode;
501}
502
503void radeon_dp_set_link_config(struct drm_connector *connector,
504 const struct drm_display_mode *mode)
505{
506 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
507 struct radeon_connector_atom_dig *dig_connector;
508
509 if (!radeon_connector->con_priv)
510 return;
511 dig_connector = radeon_connector->con_priv;
512
513 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
514 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
515 dig_connector->dp_clock =
516 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
517 dig_connector->dp_lane_count =
518 radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
519 }
520}
521
522int radeon_dp_mode_valid_helper(struct drm_connector *connector,
523 struct drm_display_mode *mode)
524{
525 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
526 struct radeon_connector_atom_dig *dig_connector;
527 int dp_clock;
528
529 if (!radeon_connector->con_priv)
530 return MODE_CLOCK_HIGH;
531 dig_connector = radeon_connector->con_priv;
532
533 dp_clock =
534 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
535
536 if ((dp_clock == 540000) &&
537 (!radeon_connector_is_dp12_capable(connector)))
538 return MODE_CLOCK_HIGH;
539
540 return MODE_OK;
541}
542
543static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
544 u8 link_status[DP_LINK_STATUS_SIZE])
545{
546 int ret;
547 ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
548 link_status, DP_LINK_STATUS_SIZE, 100);
549 if (ret <= 0) {
550 return false;
551 }
552
553 DRM_DEBUG_KMS("link status %*ph\n", 6, link_status);
554 return true;
555}
556
557bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
558{
559 u8 link_status[DP_LINK_STATUS_SIZE];
560 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
561
562 if (!radeon_dp_get_link_status(radeon_connector, link_status))
563 return false;
564 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
565 return false;
566 return true;
567}
568
569struct radeon_dp_link_train_info {
570 struct radeon_device *rdev;
571 struct drm_encoder *encoder;
572 struct drm_connector *connector;
573 struct radeon_connector *radeon_connector;
574 int enc_id;
575 int dp_clock;
576 int dp_lane_count;
577 bool tp3_supported;
578 u8 dpcd[DP_RECEIVER_CAP_SIZE];
579 u8 train_set[4];
580 u8 link_status[DP_LINK_STATUS_SIZE];
581 u8 tries;
582 bool use_dpencoder;
583};
584
585static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
586{
587
588 atombios_dig_transmitter_setup(dp_info->encoder,
589 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
590 0, dp_info->train_set[0]);
591
592
593 radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
594 dp_info->train_set, dp_info->dp_lane_count, 0);
595}
596
597static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
598{
599 int rtp = 0;
600
601
602 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
603 switch (tp) {
604 case DP_TRAINING_PATTERN_1:
605 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
606 break;
607 case DP_TRAINING_PATTERN_2:
608 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
609 break;
610 case DP_TRAINING_PATTERN_3:
611 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
612 break;
613 }
614 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
615 } else {
616 switch (tp) {
617 case DP_TRAINING_PATTERN_1:
618 rtp = 0;
619 break;
620 case DP_TRAINING_PATTERN_2:
621 rtp = 1;
622 break;
623 }
624 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
625 dp_info->dp_clock, dp_info->enc_id, rtp);
626 }
627
628
629 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
630}
631
632static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
633{
634 struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
635 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
636 u8 tmp;
637
638
639 if (dp_info->dpcd[0] >= 0x11)
640 radeon_write_dpcd_reg(dp_info->radeon_connector,
641 DP_SET_POWER, DP_SET_POWER_D0);
642
643
644 if (dp_info->dpcd[3] & 0x1)
645 radeon_write_dpcd_reg(dp_info->radeon_connector,
646 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
647 else
648 radeon_write_dpcd_reg(dp_info->radeon_connector,
649 DP_DOWNSPREAD_CTRL, 0);
650
651 if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
652 (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
653 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
654 }
655
656
657 tmp = dp_info->dp_lane_count;
658 if (dp_info->dpcd[DP_DPCD_REV] >= 0x11 &&
659 dp_info->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)
660 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
661 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
662
663
664 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
665 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
666
667
668 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
669 atombios_dig_encoder_setup(dp_info->encoder,
670 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
671 else
672 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
673 dp_info->dp_clock, dp_info->enc_id, 0);
674
675
676 radeon_write_dpcd_reg(dp_info->radeon_connector,
677 DP_TRAINING_PATTERN_SET,
678 DP_TRAINING_PATTERN_DISABLE);
679
680 return 0;
681}
682
683static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
684{
685 udelay(400);
686
687
688 radeon_write_dpcd_reg(dp_info->radeon_connector,
689 DP_TRAINING_PATTERN_SET,
690 DP_TRAINING_PATTERN_DISABLE);
691
692
693 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
694 atombios_dig_encoder_setup(dp_info->encoder,
695 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
696 else
697 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
698 dp_info->dp_clock, dp_info->enc_id, 0);
699
700 return 0;
701}
702
703static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
704{
705 bool clock_recovery;
706 u8 voltage;
707 int i;
708
709 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
710 memset(dp_info->train_set, 0, 4);
711 radeon_dp_update_vs_emph(dp_info);
712
713 udelay(400);
714
715
716 clock_recovery = false;
717 dp_info->tries = 0;
718 voltage = 0xff;
719 while (1) {
720 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
721
722 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
723 DRM_ERROR("displayport link status failed\n");
724 break;
725 }
726
727 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
728 clock_recovery = true;
729 break;
730 }
731
732 for (i = 0; i < dp_info->dp_lane_count; i++) {
733 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
734 break;
735 }
736 if (i == dp_info->dp_lane_count) {
737 DRM_ERROR("clock recovery reached max voltage\n");
738 break;
739 }
740
741 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
742 ++dp_info->tries;
743 if (dp_info->tries == 5) {
744 DRM_ERROR("clock recovery tried 5 times\n");
745 break;
746 }
747 } else
748 dp_info->tries = 0;
749
750 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
751
752
753 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
754
755 radeon_dp_update_vs_emph(dp_info);
756 }
757 if (!clock_recovery) {
758 DRM_ERROR("clock recovery failed\n");
759 return -1;
760 } else {
761 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
762 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
763 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
764 DP_TRAIN_PRE_EMPHASIS_SHIFT);
765 return 0;
766 }
767}
768
769static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
770{
771 bool channel_eq;
772
773 if (dp_info->tp3_supported)
774 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
775 else
776 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
777
778
779 dp_info->tries = 0;
780 channel_eq = false;
781 while (1) {
782 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
783
784 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
785 DRM_ERROR("displayport link status failed\n");
786 break;
787 }
788
789 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
790 channel_eq = true;
791 break;
792 }
793
794
795 if (dp_info->tries > 5) {
796 DRM_ERROR("channel eq failed: 5 tries\n");
797 break;
798 }
799
800
801 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
802
803 radeon_dp_update_vs_emph(dp_info);
804 dp_info->tries++;
805 }
806
807 if (!channel_eq) {
808 DRM_ERROR("channel eq failed\n");
809 return -1;
810 } else {
811 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
812 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
813 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
814 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
815 return 0;
816 }
817}
818
819void radeon_dp_link_train(struct drm_encoder *encoder,
820 struct drm_connector *connector)
821{
822 struct drm_device *dev = encoder->dev;
823 struct radeon_device *rdev = dev->dev_private;
824 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
825 struct radeon_encoder_atom_dig *dig;
826 struct radeon_connector *radeon_connector;
827 struct radeon_connector_atom_dig *dig_connector;
828 struct radeon_dp_link_train_info dp_info;
829 int index;
830 u8 tmp, frev, crev;
831
832 if (!radeon_encoder->enc_priv)
833 return;
834 dig = radeon_encoder->enc_priv;
835
836 radeon_connector = to_radeon_connector(connector);
837 if (!radeon_connector->con_priv)
838 return;
839 dig_connector = radeon_connector->con_priv;
840
841 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
842 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
843 return;
844
845
846
847
848
849 dp_info.use_dpencoder = true;
850 index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
851 if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
852 if (crev > 1) {
853 dp_info.use_dpencoder = false;
854 }
855 }
856
857 dp_info.enc_id = 0;
858 if (dig->dig_encoder)
859 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
860 else
861 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
862 if (dig->linkb)
863 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
864 else
865 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
866
867 tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
868 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
869 dp_info.tp3_supported = true;
870 else
871 dp_info.tp3_supported = false;
872
873 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
874 dp_info.rdev = rdev;
875 dp_info.encoder = encoder;
876 dp_info.connector = connector;
877 dp_info.radeon_connector = radeon_connector;
878 dp_info.dp_lane_count = dig_connector->dp_lane_count;
879 dp_info.dp_clock = dig_connector->dp_clock;
880
881 if (radeon_dp_link_train_init(&dp_info))
882 goto done;
883 if (radeon_dp_link_train_cr(&dp_info))
884 goto done;
885 if (radeon_dp_link_train_ce(&dp_info))
886 goto done;
887done:
888 if (radeon_dp_link_train_finish(&dp_info))
889 return;
890}
891
