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path: root/drivers/gpu/drm/radeon/atombios_dp.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c790
1 files changed, 790 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
new file mode 100644
index 000000000000..0d63c4436e7c
--- /dev/null
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -0,0 +1,790 @@
1/*
2 * Copyright 2007-8 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 *
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:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
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.
22 *
23 * Authors: Dave Airlie
24 * Alex Deucher
25 */
26#include "drmP.h"
27#include "radeon_drm.h"
28#include "radeon.h"
29
30#include "atom.h"
31#include "atom-bits.h"
32#include "drm_dp_helper.h"
33
34/* move these to drm_dp_helper.c/h */
35#define DP_LINK_CONFIGURATION_SIZE 9
36#define DP_LINK_STATUS_SIZE 6
37#define DP_DPCD_SIZE 8
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
46static const int dp_clocks[] = {
47 54000, /* 1 lane, 1.62 Ghz */
48 90000, /* 1 lane, 2.70 Ghz */
49 108000, /* 2 lane, 1.62 Ghz */
50 180000, /* 2 lane, 2.70 Ghz */
51 216000, /* 4 lane, 1.62 Ghz */
52 360000, /* 4 lane, 2.70 Ghz */
53};
54
55static const int num_dp_clocks = sizeof(dp_clocks) / sizeof(int);
56
57/* common helper functions */
58static int dp_lanes_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
59{
60 int i;
61 u8 max_link_bw;
62 u8 max_lane_count;
63
64 if (!dpcd)
65 return 0;
66
67 max_link_bw = dpcd[DP_MAX_LINK_RATE];
68 max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
69
70 switch (max_link_bw) {
71 case DP_LINK_BW_1_62:
72 default:
73 for (i = 0; i < num_dp_clocks; i++) {
74 if (i % 2)
75 continue;
76 switch (max_lane_count) {
77 case 1:
78 if (i > 1)
79 return 0;
80 break;
81 case 2:
82 if (i > 3)
83 return 0;
84 break;
85 case 4:
86 default:
87 break;
88 }
89 if (dp_clocks[i] > mode_clock) {
90 if (i < 2)
91 return 1;
92 else if (i < 4)
93 return 2;
94 else
95 return 4;
96 }
97 }
98 break;
99 case DP_LINK_BW_2_7:
100 for (i = 0; i < num_dp_clocks; i++) {
101 switch (max_lane_count) {
102 case 1:
103 if (i > 1)
104 return 0;
105 break;
106 case 2:
107 if (i > 3)
108 return 0;
109 break;
110 case 4:
111 default:
112 break;
113 }
114 if (dp_clocks[i] > mode_clock) {
115 if (i < 2)
116 return 1;
117 else if (i < 4)
118 return 2;
119 else
120 return 4;
121 }
122 }
123 break;
124 }
125
126 return 0;
127}
128
129static int dp_link_clock_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
130{
131 int i;
132 u8 max_link_bw;
133 u8 max_lane_count;
134
135 if (!dpcd)
136 return 0;
137
138 max_link_bw = dpcd[DP_MAX_LINK_RATE];
139 max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
140
141 switch (max_link_bw) {
142 case DP_LINK_BW_1_62:
143 default:
144 for (i = 0; i < num_dp_clocks; i++) {
145 if (i % 2)
146 continue;
147 switch (max_lane_count) {
148 case 1:
149 if (i > 1)
150 return 0;
151 break;
152 case 2:
153 if (i > 3)
154 return 0;
155 break;
156 case 4:
157 default:
158 break;
159 }
160 if (dp_clocks[i] > mode_clock)
161 return 162000;
162 }
163 break;
164 case DP_LINK_BW_2_7:
165 for (i = 0; i < num_dp_clocks; i++) {
166 switch (max_lane_count) {
167 case 1:
168 if (i > 1)
169 return 0;
170 break;
171 case 2:
172 if (i > 3)
173 return 0;
174 break;
175 case 4:
176 default:
177 break;
178 }
179 if (dp_clocks[i] > mode_clock)
180 return (i % 2) ? 270000 : 162000;
181 }
182 }
183
184 return 0;
185}
186
187int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
188{
189 int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
190 int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
191
192 if ((lanes == 0) || (bw == 0))
193 return MODE_CLOCK_HIGH;
194
195 return MODE_OK;
196}
197
198static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
199{
200 return link_status[r - DP_LANE0_1_STATUS];
201}
202
203static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
204 int lane)
205{
206 int i = DP_LANE0_1_STATUS + (lane >> 1);
207 int s = (lane & 1) * 4;
208 u8 l = dp_link_status(link_status, i);
209 return (l >> s) & 0xf;
210}
211
212static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
213 int lane_count)
214{
215 int lane;
216 u8 lane_status;
217
218 for (lane = 0; lane < lane_count; lane++) {
219 lane_status = dp_get_lane_status(link_status, lane);
220 if ((lane_status & DP_LANE_CR_DONE) == 0)
221 return false;
222 }
223 return true;
224}
225
226static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
227 int lane_count)
228{
229 u8 lane_align;
230 u8 lane_status;
231 int lane;
232
233 lane_align = dp_link_status(link_status,
234 DP_LANE_ALIGN_STATUS_UPDATED);
235 if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
236 return false;
237 for (lane = 0; lane < lane_count; lane++) {
238 lane_status = dp_get_lane_status(link_status, lane);
239 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
240 return false;
241 }
242 return true;
243}
244
245static u8 dp_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
246 int lane)
247
248{
249 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
250 int s = ((lane & 1) ?
251 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
252 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
253 u8 l = dp_link_status(link_status, i);
254
255 return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
256}
257
258static u8 dp_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
259 int lane)
260{
261 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
262 int s = ((lane & 1) ?
263 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
264 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
265 u8 l = dp_link_status(link_status, i);
266
267 return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
268}
269
270/* XXX fix me -- chip specific */
271#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_1200
272static u8 dp_pre_emphasis_max(u8 voltage_swing)
273{
274 switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
275 case DP_TRAIN_VOLTAGE_SWING_400:
276 return DP_TRAIN_PRE_EMPHASIS_6;
277 case DP_TRAIN_VOLTAGE_SWING_600:
278 return DP_TRAIN_PRE_EMPHASIS_6;
279 case DP_TRAIN_VOLTAGE_SWING_800:
280 return DP_TRAIN_PRE_EMPHASIS_3_5;
281 case DP_TRAIN_VOLTAGE_SWING_1200:
282 default:
283 return DP_TRAIN_PRE_EMPHASIS_0;
284 }
285}
286
287static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
288 int lane_count,
289 u8 train_set[4])
290{
291 u8 v = 0;
292 u8 p = 0;
293 int lane;
294
295 for (lane = 0; lane < lane_count; lane++) {
296 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
297 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
298
299 DRM_DEBUG("requested signal parameters: lane %d voltage %s pre_emph %s\n",
300 lane,
301 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
302 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
303
304 if (this_v > v)
305 v = this_v;
306 if (this_p > p)
307 p = this_p;
308 }
309
310 if (v >= DP_VOLTAGE_MAX)
311 v = DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;
312
313 if (p >= dp_pre_emphasis_max(v))
314 p = dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
315
316 DRM_DEBUG("using signal parameters: voltage %s pre_emph %s\n",
317 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
318 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
319
320 for (lane = 0; lane < 4; lane++)
321 train_set[lane] = v | p;
322}
323
324
325/* radeon aux chan functions */
326bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
327 int num_bytes, u8 *read_byte,
328 u8 read_buf_len, u8 delay)
329{
330 struct drm_device *dev = chan->dev;
331 struct radeon_device *rdev = dev->dev_private;
332 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args;
333 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
334 unsigned char *base;
335
336 memset(&args, 0, sizeof(args));
337
338 base = (unsigned char *)rdev->mode_info.atom_context->scratch;
339
340 memcpy(base, req_bytes, num_bytes);
341
342 args.lpAuxRequest = 0;
343 args.lpDataOut = 16;
344 args.ucDataOutLen = 0;
345 args.ucChannelID = chan->rec.i2c_id;
346 args.ucDelay = delay / 10;
347
348 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
349
350 if (args.ucReplyStatus) {
351 DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x\n",
352 req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
353 chan->rec.i2c_id, args.ucReplyStatus);
354 return false;
355 }
356
357 if (args.ucDataOutLen && read_byte && read_buf_len) {
358 if (read_buf_len < args.ucDataOutLen) {
359 DRM_ERROR("Buffer to small for return answer %d %d\n",
360 read_buf_len, args.ucDataOutLen);
361 return false;
362 }
363 {
364 int len = min(read_buf_len, args.ucDataOutLen);
365 memcpy(read_byte, base + 16, len);
366 }
367 }
368 return true;
369}
370
371bool radeon_dp_aux_native_write(struct radeon_connector *radeon_connector, uint16_t address,
372 uint8_t send_bytes, uint8_t *send)
373{
374 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
375 u8 msg[20];
376 u8 msg_len, dp_msg_len;
377 bool ret;
378
379 dp_msg_len = 4;
380 msg[0] = address;
381 msg[1] = address >> 8;
382 msg[2] = AUX_NATIVE_WRITE << 4;
383 dp_msg_len += send_bytes;
384 msg[3] = (dp_msg_len << 4) | (send_bytes - 1);
385
386 if (send_bytes > 16)
387 return false;
388
389 memcpy(&msg[4], send, send_bytes);
390 msg_len = 4 + send_bytes;
391 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, NULL, 0, 0);
392 return ret;
393}
394
395bool radeon_dp_aux_native_read(struct radeon_connector *radeon_connector, uint16_t address,
396 uint8_t delay, uint8_t expected_bytes,
397 uint8_t *read_p)
398{
399 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
400 u8 msg[20];
401 u8 msg_len, dp_msg_len;
402 bool ret = false;
403 msg_len = 4;
404 dp_msg_len = 4;
405 msg[0] = address;
406 msg[1] = address >> 8;
407 msg[2] = AUX_NATIVE_READ << 4;
408 msg[3] = (dp_msg_len) << 4;
409 msg[3] |= expected_bytes - 1;
410
411 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, read_p, expected_bytes, delay);
412 return ret;
413}
414
415/* radeon dp functions */
416static u8 radeon_dp_encoder_service(struct radeon_device *rdev, int action, int dp_clock,
417 uint8_t ucconfig, uint8_t lane_num)
418{
419 DP_ENCODER_SERVICE_PARAMETERS args;
420 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
421
422 memset(&args, 0, sizeof(args));
423 args.ucLinkClock = dp_clock / 10;
424 args.ucConfig = ucconfig;
425 args.ucAction = action;
426 args.ucLaneNum = lane_num;
427 args.ucStatus = 0;
428
429 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
430 return args.ucStatus;
431}
432
433u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
434{
435 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
436 struct drm_device *dev = radeon_connector->base.dev;
437 struct radeon_device *rdev = dev->dev_private;
438
439 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
440 dig_connector->dp_i2c_bus->rec.i2c_id, 0);
441}
442
443bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
444{
445 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
446 u8 msg[25];
447 int ret;
448
449 ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, 0, 8, msg);
450 if (ret) {
451 memcpy(dig_connector->dpcd, msg, 8);
452 {
453 int i;
454 DRM_DEBUG("DPCD: ");
455 for (i = 0; i < 8; i++)
456 DRM_DEBUG("%02x ", msg[i]);
457 DRM_DEBUG("\n");
458 }
459 return true;
460 }
461 dig_connector->dpcd[0] = 0;
462 return false;
463}
464
465void radeon_dp_set_link_config(struct drm_connector *connector,
466 struct drm_display_mode *mode)
467{
468 struct radeon_connector *radeon_connector;
469 struct radeon_connector_atom_dig *dig_connector;
470
471 if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
472 return;
473
474 radeon_connector = to_radeon_connector(connector);
475 if (!radeon_connector->con_priv)
476 return;
477 dig_connector = radeon_connector->con_priv;
478
479 dig_connector->dp_clock =
480 dp_link_clock_for_mode_clock(dig_connector->dpcd, mode->clock);
481 dig_connector->dp_lane_count =
482 dp_lanes_for_mode_clock(dig_connector->dpcd, mode->clock);
483}
484
485int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,
486 struct drm_display_mode *mode)
487{
488 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
489
490 return dp_mode_valid(dig_connector->dpcd, mode->clock);
491}
492
493static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
494 u8 link_status[DP_LINK_STATUS_SIZE])
495{
496 int ret;
497 ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS, 100,
498 DP_LINK_STATUS_SIZE, link_status);
499 if (!ret) {
500 DRM_ERROR("displayport link status failed\n");
501 return false;
502 }
503
504 DRM_DEBUG("link status %02x %02x %02x %02x %02x %02x\n",
505 link_status[0], link_status[1], link_status[2],
506 link_status[3], link_status[4], link_status[5]);
507 return true;
508}
509
510bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
511{
512 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
513 u8 link_status[DP_LINK_STATUS_SIZE];
514
515 if (!atom_dp_get_link_status(radeon_connector, link_status))
516 return false;
517 if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
518 return false;
519 return true;
520}
521
522static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
523{
524 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
525
526 if (dig_connector->dpcd[0] >= 0x11) {
527 radeon_dp_aux_native_write(radeon_connector, DP_SET_POWER, 1,
528 &power_state);
529 }
530}
531
532static void dp_set_downspread(struct radeon_connector *radeon_connector, u8 downspread)
533{
534 radeon_dp_aux_native_write(radeon_connector, DP_DOWNSPREAD_CTRL, 1,
535 &downspread);
536}
537
538static void dp_set_link_bw_lanes(struct radeon_connector *radeon_connector,
539 u8 link_configuration[DP_LINK_CONFIGURATION_SIZE])
540{
541 radeon_dp_aux_native_write(radeon_connector, DP_LINK_BW_SET, 2,
542 link_configuration);
543}
544
545static void dp_update_dpvs_emph(struct radeon_connector *radeon_connector,
546 struct drm_encoder *encoder,
547 u8 train_set[4])
548{
549 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
550 int i;
551
552 for (i = 0; i < dig_connector->dp_lane_count; i++)
553 atombios_dig_transmitter_setup(encoder,
554 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
555 i, train_set[i]);
556
557 radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_LANE0_SET,
558 dig_connector->dp_lane_count, train_set);
559}
560
561static void dp_set_training(struct radeon_connector *radeon_connector,
562 u8 training)
563{
564 radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_PATTERN_SET,
565 1, &training);
566}
567
568void dp_link_train(struct drm_encoder *encoder,
569 struct drm_connector *connector)
570{
571 struct drm_device *dev = encoder->dev;
572 struct radeon_device *rdev = dev->dev_private;
573 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
574 struct radeon_encoder_atom_dig *dig;
575 struct radeon_connector *radeon_connector;
576 struct radeon_connector_atom_dig *dig_connector;
577 int enc_id = 0;
578 bool clock_recovery, channel_eq;
579 u8 link_status[DP_LINK_STATUS_SIZE];
580 u8 link_configuration[DP_LINK_CONFIGURATION_SIZE];
581 u8 tries, voltage;
582 u8 train_set[4];
583 int i;
584
585 if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
586 return;
587
588 if (!radeon_encoder->enc_priv)
589 return;
590 dig = radeon_encoder->enc_priv;
591
592 radeon_connector = to_radeon_connector(connector);
593 if (!radeon_connector->con_priv)
594 return;
595 dig_connector = radeon_connector->con_priv;
596
597 if (ASIC_IS_DCE32(rdev)) {
598 if (dig->dig_block)
599 enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
600 else
601 enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
602 if (dig_connector->linkb)
603 enc_id |= ATOM_DP_CONFIG_LINK_B;
604 else
605 enc_id |= ATOM_DP_CONFIG_LINK_A;
606 } else {
607 if (dig_connector->linkb)
608 enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER | ATOM_DP_CONFIG_LINK_B;
609 else
610 enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER | ATOM_DP_CONFIG_LINK_A;
611 }
612
613 memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
614 if (dig_connector->dp_clock == 270000)
615 link_configuration[0] = DP_LINK_BW_2_7;
616 else
617 link_configuration[0] = DP_LINK_BW_1_62;
618 link_configuration[1] = dig_connector->dp_lane_count;
619 if (dig_connector->dpcd[0] >= 0x11)
620 link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
621
622 /* power up the sink */
623 dp_set_power(radeon_connector, DP_SET_POWER_D0);
624 /* disable the training pattern on the sink */
625 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
626 /* set link bw and lanes on the sink */
627 dp_set_link_bw_lanes(radeon_connector, link_configuration);
628 /* disable downspread on the sink */
629 dp_set_downspread(radeon_connector, 0);
630 /* start training on the source */
631 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_START,
632 dig_connector->dp_clock, enc_id, 0);
633 /* set training pattern 1 on the source */
634 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
635 dig_connector->dp_clock, enc_id, 0);
636
637 /* set initial vs/emph */
638 memset(train_set, 0, 4);
639 udelay(400);
640 /* set training pattern 1 on the sink */
641 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_1);
642
643 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
644
645 /* clock recovery loop */
646 clock_recovery = false;
647 tries = 0;
648 voltage = 0xff;
649 for (;;) {
650 udelay(100);
651 if (!atom_dp_get_link_status(radeon_connector, link_status))
652 break;
653
654 if (dp_clock_recovery_ok(link_status, dig_connector->dp_lane_count)) {
655 clock_recovery = true;
656 break;
657 }
658
659 for (i = 0; i < dig_connector->dp_lane_count; i++) {
660 if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
661 break;
662 }
663 if (i == dig_connector->dp_lane_count) {
664 DRM_ERROR("clock recovery reached max voltage\n");
665 break;
666 }
667
668 if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
669 ++tries;
670 if (tries == 5) {
671 DRM_ERROR("clock recovery tried 5 times\n");
672 break;
673 }
674 } else
675 tries = 0;
676
677 voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
678
679 /* Compute new train_set as requested by sink */
680 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
681 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
682 }
683 if (!clock_recovery)
684 DRM_ERROR("clock recovery failed\n");
685 else
686 DRM_DEBUG("clock recovery at voltage %d pre-emphasis %d\n",
687 train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
688 (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
689 DP_TRAIN_PRE_EMPHASIS_SHIFT);
690
691
692 /* set training pattern 2 on the sink */
693 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
694 /* set training pattern 2 on the source */
695 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
696 dig_connector->dp_clock, enc_id, 1);
697
698 /* channel equalization loop */
699 tries = 0;
700 channel_eq = false;
701 for (;;) {
702 udelay(400);
703 if (!atom_dp_get_link_status(radeon_connector, link_status))
704 break;
705
706 if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count)) {
707 channel_eq = true;
708 break;
709 }
710
711 /* Try 5 times */
712 if (tries > 5) {
713 DRM_ERROR("channel eq failed: 5 tries\n");
714 break;
715 }
716
717 /* Compute new train_set as requested by sink */
718 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
719 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
720
721 tries++;
722 }
723
724 if (!channel_eq)
725 DRM_ERROR("channel eq failed\n");
726 else
727 DRM_DEBUG("channel eq at voltage %d pre-emphasis %d\n",
728 train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
729 (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
730 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
731
732 /* disable the training pattern on the sink */
733 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
734
735 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
736 dig_connector->dp_clock, enc_id, 0);
737}
738
739int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
740 uint8_t write_byte, uint8_t *read_byte)
741{
742 struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
743 struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
744 int ret = 0;
745 uint16_t address = algo_data->address;
746 uint8_t msg[5];
747 uint8_t reply[2];
748 int msg_len, dp_msg_len;
749 int reply_bytes;
750
751 /* Set up the command byte */
752 if (mode & MODE_I2C_READ)
753 msg[2] = AUX_I2C_READ << 4;
754 else
755 msg[2] = AUX_I2C_WRITE << 4;
756
757 if (!(mode & MODE_I2C_STOP))
758 msg[2] |= AUX_I2C_MOT << 4;
759
760 msg[0] = address;
761 msg[1] = address >> 8;
762
763 reply_bytes = 1;
764
765 msg_len = 4;
766 dp_msg_len = 3;
767 switch (mode) {
768 case MODE_I2C_WRITE:
769 msg[4] = write_byte;
770 msg_len++;
771 dp_msg_len += 2;
772 break;
773 case MODE_I2C_READ:
774 dp_msg_len += 1;
775 break;
776 default:
777 break;
778 }
779
780 msg[3] = (dp_msg_len) << 4;
781 ret = radeon_process_aux_ch(auxch, msg, msg_len, reply, reply_bytes, 0);
782
783 if (ret) {
784 if (read_byte)
785 *read_byte = reply[0];
786 return reply_bytes;
787 }
788 return -EREMOTEIO;
789}
790
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 14:50:49 -0500