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 * Jerome Glisse
26 */
27
28#include <drm/radeon_drm.h>
29#include "radeon.h"
30
31#include "atom.h"
32#include "atom-bits.h"
33#include <drm/display/drm_dp_helper.h>
34
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
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/***** radeon AUX functions *****/
47
48/* Atom needs data in little endian format so swap as appropriate when copying
49 * data to or from atom. Note that atom operates on dw units.
50 *
51 * Use to_le=true when sending data to atom and provide at least
52 * ALIGN(num_bytes,4) bytes in the dst buffer.
53 *
54 * Use to_le=false when receiving data from atom and provide ALIGN(num_bytes,4)
55 * byes in the src buffer.
56 */
57void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
58{
59#ifdef __BIG_ENDIAN
60 u32 src_tmp[5], dst_tmp[5];
61 int i;
62 u8 align_num_bytes = ALIGN(num_bytes, 4);
63
64 if (to_le) {
65 memcpy(src_tmp, src, num_bytes);
66 for (i = 0; i < align_num_bytes / 4; i++)
67 dst_tmp[i] = cpu_to_le32(src_tmp[i]);
68 memcpy(dst, dst_tmp, align_num_bytes);
69 } else {
70 memcpy(src_tmp, src, align_num_bytes);
71 for (i = 0; i < align_num_bytes / 4; i++)
72 dst_tmp[i] = le32_to_cpu(src_tmp[i]);
73 memcpy(dst, dst_tmp, num_bytes);
74 }
75#else
76 memcpy(dst, src, num_bytes);
77#endif
78}
79
80union aux_channel_transaction {
81 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
82 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
83};
84
85static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
86 u8 *send, int send_bytes,
87 u8 *recv, int recv_size,
88 u8 delay, u8 *ack)
89{
90 struct drm_device *dev = chan->dev;
91 struct radeon_device *rdev = dev->dev_private;
92 union aux_channel_transaction args;
93 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
94 unsigned char *base;
95 int recv_bytes;
96 int r = 0;
97
98 memset(&args, 0, sizeof(args));
99
100 mutex_lock(&chan->mutex);
101 mutex_lock(&rdev->mode_info.atom_context->scratch_mutex);
102
103 base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
104
105 radeon_atom_copy_swap(dst: base, src: send, num_bytes: send_bytes, to_le: true);
106
107 args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
108 args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
109 args.v1.ucDataOutLen = 0;
110 args.v1.ucChannelID = chan->rec.i2c_id;
111 args.v1.ucDelay = delay / 10;
112 if (ASIC_IS_DCE4(rdev))
113 args.v2.ucHPD_ID = chan->rec.hpd;
114
115 atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args);
116
117 *ack = args.v1.ucReplyStatus;
118
119 /* timeout */
120 if (args.v1.ucReplyStatus == 1) {
121 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
122 r = -ETIMEDOUT;
123 goto done;
124 }
125
126 /* flags not zero */
127 if (args.v1.ucReplyStatus == 2) {
128 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
129 r = -EIO;
130 goto done;
131 }
132
133 /* error */
134 if (args.v1.ucReplyStatus == 3) {
135 DRM_DEBUG_KMS("dp_aux_ch error\n");
136 r = -EIO;
137 goto done;
138 }
139
140 recv_bytes = args.v1.ucDataOutLen;
141 if (recv_bytes > recv_size)
142 recv_bytes = recv_size;
143
144 if (recv && recv_size)
145 radeon_atom_copy_swap(dst: recv, src: base + 16, num_bytes: recv_bytes, to_le: false);
146
147 r = recv_bytes;
148done:
149 mutex_unlock(lock: &rdev->mode_info.atom_context->scratch_mutex);
150 mutex_unlock(lock: &chan->mutex);
151
152 return r;
153}
154
155#define BARE_ADDRESS_SIZE 3
156#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
157
158static ssize_t
159radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
160{
161 struct radeon_i2c_chan *chan =
162 container_of(aux, struct radeon_i2c_chan, aux);
163 int ret;
164 u8 tx_buf[20];
165 size_t tx_size;
166 u8 ack, delay = 0;
167
168 if (WARN_ON(msg->size > 16))
169 return -E2BIG;
170
171 tx_buf[0] = msg->address & 0xff;
172 tx_buf[1] = (msg->address >> 8) & 0xff;
173 tx_buf[2] = (msg->request << 4) |
174 ((msg->address >> 16) & 0xf);
175 tx_buf[3] = msg->size ? (msg->size - 1) : 0;
176
177 switch (msg->request & ~DP_AUX_I2C_MOT) {
178 case DP_AUX_NATIVE_WRITE:
179 case DP_AUX_I2C_WRITE:
180 case DP_AUX_I2C_WRITE_STATUS_UPDATE:
181 /* The atom implementation only supports writes with a max payload of
182 * 12 bytes since it uses 4 bits for the total count (header + payload)
183 * in the parameter space. The atom interface supports 16 byte
184 * payloads for reads. The hw itself supports up to 16 bytes of payload.
185 */
186 if (WARN_ON_ONCE(msg->size > 12))
187 return -E2BIG;
188 /* tx_size needs to be 4 even for bare address packets since the atom
189 * table needs the info in tx_buf[3].
190 */
191 tx_size = HEADER_SIZE + msg->size;
192 if (msg->size == 0)
193 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
194 else
195 tx_buf[3] |= tx_size << 4;
196 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
197 ret = radeon_process_aux_ch(chan,
198 send: tx_buf, send_bytes: tx_size, NULL, recv_size: 0, delay, ack: &ack);
199 if (ret >= 0)
200 /* Return payload size. */
201 ret = msg->size;
202 break;
203 case DP_AUX_NATIVE_READ:
204 case DP_AUX_I2C_READ:
205 /* tx_size needs to be 4 even for bare address packets since the atom
206 * table needs the info in tx_buf[3].
207 */
208 tx_size = HEADER_SIZE;
209 if (msg->size == 0)
210 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
211 else
212 tx_buf[3] |= tx_size << 4;
213 ret = radeon_process_aux_ch(chan,
214 send: tx_buf, send_bytes: tx_size, recv: msg->buffer, recv_size: msg->size, delay, ack: &ack);
215 break;
216 default:
217 ret = -EINVAL;
218 break;
219 }
220
221 if (ret >= 0)
222 msg->reply = ack >> 4;
223
224 return ret;
225}
226
227void radeon_dp_aux_init(struct radeon_connector *radeon_connector)
228{
229 struct drm_device *dev = radeon_connector->base.dev;
230 struct radeon_device *rdev = dev->dev_private;
231 int ret;
232
233 radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
234 radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
235 radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev;
236 if (ASIC_IS_DCE5(rdev)) {
237 if (radeon_auxch)
238 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native;
239 else
240 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
241 } else {
242 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
243 }
244
245 ret = drm_dp_aux_register(aux: &radeon_connector->ddc_bus->aux);
246 if (!ret)
247 radeon_connector->ddc_bus->has_aux = true;
248
249 WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret);
250}
251
252/***** general DP utility functions *****/
253
254#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3
255#define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3
256
257static void dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
258 int lane_count,
259 u8 train_set[4])
260{
261 u8 v = 0;
262 u8 p = 0;
263 int lane;
264
265 for (lane = 0; lane < lane_count; lane++) {
266 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
267 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
268
269 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
270 lane,
271 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
272 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
273
274 if (this_v > v)
275 v = this_v;
276 if (this_p > p)
277 p = this_p;
278 }
279
280 if (v >= DP_VOLTAGE_MAX)
281 v |= DP_TRAIN_MAX_SWING_REACHED;
282
283 if (p >= DP_PRE_EMPHASIS_MAX)
284 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
285
286 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
287 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
288 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
289
290 for (lane = 0; lane < 4; lane++)
291 train_set[lane] = v | p;
292}
293
294/* convert bits per color to bits per pixel */
295/* get bpc from the EDID */
296static int convert_bpc_to_bpp(int bpc)
297{
298 if (bpc == 0)
299 return 24;
300 else
301 return bpc * 3;
302}
303
304/***** radeon specific DP functions *****/
305
306static int radeon_dp_get_dp_link_config(struct drm_connector *connector,
307 const u8 dpcd[DP_DPCD_SIZE],
308 unsigned pix_clock,
309 unsigned *dp_lanes, unsigned *dp_rate)
310{
311 int bpp = convert_bpc_to_bpp(bpc: radeon_get_monitor_bpc(connector));
312 static const unsigned link_rates[3] = { 162000, 270000, 540000 };
313 unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
314 unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
315 unsigned lane_num, i, max_pix_clock;
316
317 if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
318 ENCODER_OBJECT_ID_NUTMEG) {
319 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
320 max_pix_clock = (lane_num * 270000 * 8) / bpp;
321 if (max_pix_clock >= pix_clock) {
322 *dp_lanes = lane_num;
323 *dp_rate = 270000;
324 return 0;
325 }
326 }
327 } else {
328 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
329 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
330 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
331 if (max_pix_clock >= pix_clock) {
332 *dp_lanes = lane_num;
333 *dp_rate = link_rates[i];
334 return 0;
335 }
336 }
337 }
338 }
339
340 return -EINVAL;
341}
342
343static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
344 int action, int dp_clock,
345 u8 ucconfig, u8 lane_num)
346{
347 DP_ENCODER_SERVICE_PARAMETERS args;
348 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
349
350 memset(&args, 0, sizeof(args));
351 args.ucLinkClock = dp_clock / 10;
352 args.ucConfig = ucconfig;
353 args.ucAction = action;
354 args.ucLaneNum = lane_num;
355 args.ucStatus = 0;
356
357 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
358 return args.ucStatus;
359}
360
361u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
362{
363 struct drm_device *dev = radeon_connector->base.dev;
364 struct radeon_device *rdev = dev->dev_private;
365
366 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, dp_clock: 0,
367 ucconfig: radeon_connector->ddc_bus->rec.i2c_id, lane_num: 0);
368}
369
370static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
371{
372 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
373 u8 buf[3];
374
375 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
376 return;
377
378 if (drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_SINK_OUI, buffer: buf, size: 3) == 3)
379 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
380 buf[0], buf[1], buf[2]);
381
382 if (drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buffer: buf, size: 3) == 3)
383 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
384 buf[0], buf[1], buf[2]);
385}
386
387bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
388{
389 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
390 u8 msg[DP_DPCD_SIZE];
391 int ret;
392
393 ret = drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_DPCD_REV, buffer: msg,
394 DP_DPCD_SIZE);
395 if (ret == DP_DPCD_SIZE) {
396 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
397
398 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
399 dig_connector->dpcd);
400
401 radeon_dp_probe_oui(radeon_connector);
402
403 return true;
404 }
405
406 dig_connector->dpcd[0] = 0;
407 return false;
408}
409
410int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
411 struct drm_connector *connector)
412{
413 struct drm_device *dev = encoder->dev;
414 struct radeon_device *rdev = dev->dev_private;
415 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
416 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
417 u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
418 u8 tmp;
419
420 if (!ASIC_IS_DCE4(rdev))
421 return panel_mode;
422
423 if (!radeon_connector->con_priv)
424 return panel_mode;
425
426 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
427 /* DP bridge chips */
428 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux,
429 DP_EDP_CONFIGURATION_CAP, valuep: &tmp) == 1) {
430 if (tmp & 1)
431 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
432 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
433 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
434 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
435 else
436 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
437 }
438 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
439 /* eDP */
440 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux,
441 DP_EDP_CONFIGURATION_CAP, valuep: &tmp) == 1) {
442 if (tmp & 1)
443 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
444 }
445 }
446
447 return panel_mode;
448}
449
450void radeon_dp_set_link_config(struct drm_connector *connector,
451 const struct drm_display_mode *mode)
452{
453 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
454 struct radeon_connector_atom_dig *dig_connector;
455 int ret;
456
457 if (!radeon_connector->con_priv)
458 return;
459 dig_connector = radeon_connector->con_priv;
460
461 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
462 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
463 ret = radeon_dp_get_dp_link_config(connector, dpcd: dig_connector->dpcd,
464 pix_clock: mode->clock,
465 dp_lanes: &dig_connector->dp_lane_count,
466 dp_rate: &dig_connector->dp_clock);
467 if (ret) {
468 dig_connector->dp_clock = 0;
469 dig_connector->dp_lane_count = 0;
470 }
471 }
472}
473
474int radeon_dp_mode_valid_helper(struct drm_connector *connector,
475 struct drm_display_mode *mode)
476{
477 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
478 struct radeon_connector_atom_dig *dig_connector;
479 unsigned dp_clock, dp_lanes;
480 int ret;
481
482 if ((mode->clock > 340000) &&
483 (!radeon_connector_is_dp12_capable(connector)))
484 return MODE_CLOCK_HIGH;
485
486 if (!radeon_connector->con_priv)
487 return MODE_CLOCK_HIGH;
488 dig_connector = radeon_connector->con_priv;
489
490 ret = radeon_dp_get_dp_link_config(connector, dpcd: dig_connector->dpcd,
491 pix_clock: mode->clock,
492 dp_lanes: &dp_lanes,
493 dp_rate: &dp_clock);
494 if (ret)
495 return MODE_CLOCK_HIGH;
496
497 if ((dp_clock == 540000) &&
498 (!radeon_connector_is_dp12_capable(connector)))
499 return MODE_CLOCK_HIGH;
500
501 return MODE_OK;
502}
503
504bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
505{
506 u8 link_status[DP_LINK_STATUS_SIZE];
507 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
508
509 if (drm_dp_dpcd_read_link_status(aux: &radeon_connector->ddc_bus->aux, status: link_status)
510 <= 0)
511 return false;
512 if (drm_dp_channel_eq_ok(link_status, lane_count: dig->dp_lane_count))
513 return false;
514 return true;
515}
516
517void radeon_dp_set_rx_power_state(struct drm_connector *connector,
518 u8 power_state)
519{
520 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
521 struct radeon_connector_atom_dig *dig_connector;
522
523 if (!radeon_connector->con_priv)
524 return;
525
526 dig_connector = radeon_connector->con_priv;
527
528 /* power up/down the sink */
529 if (dig_connector->dpcd[0] >= 0x11) {
530 drm_dp_dpcd_writeb(aux: &radeon_connector->ddc_bus->aux,
531 DP_SET_POWER, value: power_state);
532 usleep_range(min: 1000, max: 2000);
533 }
534}
535
536
537struct radeon_dp_link_train_info {
538 struct radeon_device *rdev;
539 struct drm_encoder *encoder;
540 struct drm_connector *connector;
541 int enc_id;
542 int dp_clock;
543 int dp_lane_count;
544 bool tp3_supported;
545 u8 dpcd[DP_RECEIVER_CAP_SIZE];
546 u8 train_set[4];
547 u8 link_status[DP_LINK_STATUS_SIZE];
548 u8 tries;
549 bool use_dpencoder;
550 struct drm_dp_aux *aux;
551};
552
553static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
554{
555 /* set the initial vs/emph on the source */
556 atombios_dig_transmitter_setup(encoder: dp_info->encoder,
557 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
558 lane_num: 0, lane_set: dp_info->train_set[0]); /* sets all lanes at once */
559
560 /* set the vs/emph on the sink */
561 drm_dp_dpcd_write(aux: dp_info->aux, DP_TRAINING_LANE0_SET,
562 buffer: dp_info->train_set, size: dp_info->dp_lane_count);
563}
564
565static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
566{
567 int rtp = 0;
568
569 /* set training pattern on the source */
570 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
571 switch (tp) {
572 case DP_TRAINING_PATTERN_1:
573 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
574 break;
575 case DP_TRAINING_PATTERN_2:
576 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
577 break;
578 case DP_TRAINING_PATTERN_3:
579 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
580 break;
581 }
582 atombios_dig_encoder_setup(encoder: dp_info->encoder, action: rtp, panel_mode: 0);
583 } else {
584 switch (tp) {
585 case DP_TRAINING_PATTERN_1:
586 rtp = 0;
587 break;
588 case DP_TRAINING_PATTERN_2:
589 rtp = 1;
590 break;
591 }
592 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
593 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: rtp);
594 }
595
596 /* enable training pattern on the sink */
597 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_TRAINING_PATTERN_SET, value: tp);
598}
599
600static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
601{
602 struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
603 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
604 u8 tmp;
605
606 /* power up the sink */
607 radeon_dp_set_rx_power_state(connector: dp_info->connector, DP_SET_POWER_D0);
608
609 /* possibly enable downspread on the sink */
610 if (dp_info->dpcd[3] & 0x1)
611 drm_dp_dpcd_writeb(aux: dp_info->aux,
612 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
613 else
614 drm_dp_dpcd_writeb(aux: dp_info->aux,
615 DP_DOWNSPREAD_CTRL, value: 0);
616
617 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
618 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_EDP_CONFIGURATION_SET, value: 1);
619
620 /* set the lane count on the sink */
621 tmp = dp_info->dp_lane_count;
622 if (drm_dp_enhanced_frame_cap(dpcd: dp_info->dpcd))
623 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
624 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_LANE_COUNT_SET, value: tmp);
625
626 /* set the link rate on the sink */
627 tmp = drm_dp_link_rate_to_bw_code(link_rate: dp_info->dp_clock);
628 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_LINK_BW_SET, value: tmp);
629
630 /* start training on the source */
631 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
632 atombios_dig_encoder_setup(encoder: dp_info->encoder,
633 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, panel_mode: 0);
634 else
635 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
636 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: 0);
637
638 /* disable the training pattern on the sink */
639 drm_dp_dpcd_writeb(aux: dp_info->aux,
640 DP_TRAINING_PATTERN_SET,
641 DP_TRAINING_PATTERN_DISABLE);
642
643 return 0;
644}
645
646static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
647{
648 udelay(400);
649
650 /* disable the training pattern on the sink */
651 drm_dp_dpcd_writeb(aux: dp_info->aux,
652 DP_TRAINING_PATTERN_SET,
653 DP_TRAINING_PATTERN_DISABLE);
654
655 /* disable the training pattern on the source */
656 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
657 atombios_dig_encoder_setup(encoder: dp_info->encoder,
658 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, panel_mode: 0);
659 else
660 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
661 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: 0);
662
663 return 0;
664}
665
666static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
667{
668 bool clock_recovery;
669 u8 voltage;
670 int i;
671
672 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
673 memset(dp_info->train_set, 0, 4);
674 radeon_dp_update_vs_emph(dp_info);
675
676 udelay(400);
677
678 /* clock recovery loop */
679 clock_recovery = false;
680 dp_info->tries = 0;
681 voltage = 0xff;
682 while (1) {
683 drm_dp_link_train_clock_recovery_delay(aux: dp_info->aux, dpcd: dp_info->dpcd);
684
685 if (drm_dp_dpcd_read_link_status(aux: dp_info->aux,
686 status: dp_info->link_status) <= 0) {
687 DRM_ERROR("displayport link status failed\n");
688 break;
689 }
690
691 if (drm_dp_clock_recovery_ok(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count)) {
692 clock_recovery = true;
693 break;
694 }
695
696 for (i = 0; i < dp_info->dp_lane_count; i++) {
697 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
698 break;
699 }
700 if (i == dp_info->dp_lane_count) {
701 DRM_ERROR("clock recovery reached max voltage\n");
702 break;
703 }
704
705 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
706 ++dp_info->tries;
707 if (dp_info->tries == 5) {
708 DRM_ERROR("clock recovery tried 5 times\n");
709 break;
710 }
711 } else
712 dp_info->tries = 0;
713
714 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
715
716 /* Compute new train_set as requested by sink */
717 dp_get_adjust_train(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count, train_set: dp_info->train_set);
718
719 radeon_dp_update_vs_emph(dp_info);
720 }
721 if (!clock_recovery) {
722 DRM_ERROR("clock recovery failed\n");
723 return -1;
724 } else {
725 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
726 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
727 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
728 DP_TRAIN_PRE_EMPHASIS_SHIFT);
729 return 0;
730 }
731}
732
733static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
734{
735 bool channel_eq;
736
737 if (dp_info->tp3_supported)
738 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
739 else
740 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
741
742 /* channel equalization loop */
743 dp_info->tries = 0;
744 channel_eq = false;
745 while (1) {
746 drm_dp_link_train_channel_eq_delay(aux: dp_info->aux, dpcd: dp_info->dpcd);
747
748 if (drm_dp_dpcd_read_link_status(aux: dp_info->aux,
749 status: dp_info->link_status) <= 0) {
750 DRM_ERROR("displayport link status failed\n");
751 break;
752 }
753
754 if (drm_dp_channel_eq_ok(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count)) {
755 channel_eq = true;
756 break;
757 }
758
759 /* Try 5 times */
760 if (dp_info->tries > 5) {
761 DRM_ERROR("channel eq failed: 5 tries\n");
762 break;
763 }
764
765 /* Compute new train_set as requested by sink */
766 dp_get_adjust_train(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count, train_set: dp_info->train_set);
767
768 radeon_dp_update_vs_emph(dp_info);
769 dp_info->tries++;
770 }
771
772 if (!channel_eq) {
773 DRM_ERROR("channel eq failed\n");
774 return -1;
775 } else {
776 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
777 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
778 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
779 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
780 return 0;
781 }
782}
783
784void radeon_dp_link_train(struct drm_encoder *encoder,
785 struct drm_connector *connector)
786{
787 struct drm_device *dev = encoder->dev;
788 struct radeon_device *rdev = dev->dev_private;
789 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
790 struct radeon_encoder_atom_dig *dig;
791 struct radeon_connector *radeon_connector;
792 struct radeon_connector_atom_dig *dig_connector;
793 struct radeon_dp_link_train_info dp_info;
794 int index;
795 u8 tmp, frev, crev;
796
797 if (!radeon_encoder->enc_priv)
798 return;
799 dig = radeon_encoder->enc_priv;
800
801 radeon_connector = to_radeon_connector(connector);
802 if (!radeon_connector->con_priv)
803 return;
804 dig_connector = radeon_connector->con_priv;
805
806 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
807 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
808 return;
809
810 /* DPEncoderService newer than 1.1 can't program properly the
811 * training pattern. When facing such version use the
812 * DIGXEncoderControl (X== 1 | 2)
813 */
814 dp_info.use_dpencoder = true;
815 index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
816 if (atom_parse_cmd_header(ctx: rdev->mode_info.atom_context, index, frev: &frev, crev: &crev)) {
817 if (crev > 1)
818 dp_info.use_dpencoder = false;
819 }
820
821 dp_info.enc_id = 0;
822 if (dig->dig_encoder)
823 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
824 else
825 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
826 if (dig->linkb)
827 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
828 else
829 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
830
831 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, valuep: &tmp)
832 == 1) {
833 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
834 dp_info.tp3_supported = true;
835 else
836 dp_info.tp3_supported = false;
837 } else {
838 dp_info.tp3_supported = false;
839 }
840
841 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
842 dp_info.rdev = rdev;
843 dp_info.encoder = encoder;
844 dp_info.connector = connector;
845 dp_info.dp_lane_count = dig_connector->dp_lane_count;
846 dp_info.dp_clock = dig_connector->dp_clock;
847 dp_info.aux = &radeon_connector->ddc_bus->aux;
848
849 if (radeon_dp_link_train_init(dp_info: &dp_info))
850 goto done;
851 if (radeon_dp_link_train_cr(dp_info: &dp_info))
852 goto done;
853 if (radeon_dp_link_train_ce(dp_info: &dp_info))
854 goto done;
855done:
856 if (radeon_dp_link_train_finish(dp_info: &dp_info))
857 return;
858}
859

source code of linux/drivers/gpu/drm/radeon/atombios_dp.c