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, sizeof(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
232 radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
233 radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev;
234 if (ASIC_IS_DCE5(rdev)) {
235 if (radeon_auxch)
236 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native;
237 else
238 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
239 } else {
240 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
241 }
242
243 drm_dp_aux_init(aux: &radeon_connector->ddc_bus->aux);
244 radeon_connector->ddc_bus->has_aux = true;
245}
246
247/***** general DP utility functions *****/
248
249#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3
250#define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3
251
252static void dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
253 int lane_count,
254 u8 train_set[4])
255{
256 u8 v = 0;
257 u8 p = 0;
258 int lane;
259
260 for (lane = 0; lane < lane_count; lane++) {
261 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
262 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
263
264 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
265 lane,
266 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
267 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
268
269 if (this_v > v)
270 v = this_v;
271 if (this_p > p)
272 p = this_p;
273 }
274
275 if (v >= DP_VOLTAGE_MAX)
276 v |= DP_TRAIN_MAX_SWING_REACHED;
277
278 if (p >= DP_PRE_EMPHASIS_MAX)
279 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
280
281 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
282 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
283 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
284
285 for (lane = 0; lane < 4; lane++)
286 train_set[lane] = v | p;
287}
288
289/* convert bits per color to bits per pixel */
290/* get bpc from the EDID */
291static int convert_bpc_to_bpp(int bpc)
292{
293 if (bpc == 0)
294 return 24;
295 else
296 return bpc * 3;
297}
298
299/***** radeon specific DP functions *****/
300
301static int radeon_dp_get_dp_link_config(struct drm_connector *connector,
302 const u8 dpcd[DP_DPCD_SIZE],
303 unsigned pix_clock,
304 unsigned *dp_lanes, unsigned *dp_rate)
305{
306 int bpp = convert_bpc_to_bpp(bpc: radeon_get_monitor_bpc(connector));
307 static const unsigned link_rates[3] = { 162000, 270000, 540000 };
308 unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
309 unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
310 unsigned lane_num, i, max_pix_clock;
311
312 if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
313 ENCODER_OBJECT_ID_NUTMEG) {
314 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
315 max_pix_clock = (lane_num * 270000 * 8) / bpp;
316 if (max_pix_clock >= pix_clock) {
317 *dp_lanes = lane_num;
318 *dp_rate = 270000;
319 return 0;
320 }
321 }
322 } else {
323 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
324 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
325 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
326 if (max_pix_clock >= pix_clock) {
327 *dp_lanes = lane_num;
328 *dp_rate = link_rates[i];
329 return 0;
330 }
331 }
332 }
333 }
334
335 return -EINVAL;
336}
337
338static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
339 int action, int dp_clock,
340 u8 ucconfig, u8 lane_num)
341{
342 DP_ENCODER_SERVICE_PARAMETERS args;
343 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
344
345 memset(&args, 0, sizeof(args));
346 args.ucLinkClock = dp_clock / 10;
347 args.ucConfig = ucconfig;
348 args.ucAction = action;
349 args.ucLaneNum = lane_num;
350 args.ucStatus = 0;
351
352 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args, sizeof(args));
353 return args.ucStatus;
354}
355
356u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
357{
358 struct drm_device *dev = radeon_connector->base.dev;
359 struct radeon_device *rdev = dev->dev_private;
360
361 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, dp_clock: 0,
362 ucconfig: radeon_connector->ddc_bus->rec.i2c_id, lane_num: 0);
363}
364
365static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
366{
367 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
368 u8 buf[3];
369
370 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
371 return;
372
373 if (drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_SINK_OUI, buffer: buf, size: 3) == 3)
374 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
375 buf[0], buf[1], buf[2]);
376
377 if (drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buffer: buf, size: 3) == 3)
378 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
379 buf[0], buf[1], buf[2]);
380}
381
382bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
383{
384 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
385 u8 msg[DP_DPCD_SIZE];
386 int ret;
387
388 ret = drm_dp_dpcd_read(aux: &radeon_connector->ddc_bus->aux, DP_DPCD_REV, buffer: msg,
389 DP_DPCD_SIZE);
390 if (ret == DP_DPCD_SIZE) {
391 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
392
393 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
394 dig_connector->dpcd);
395
396 radeon_dp_probe_oui(radeon_connector);
397
398 return true;
399 }
400
401 dig_connector->dpcd[0] = 0;
402 return false;
403}
404
405int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
406 struct drm_connector *connector)
407{
408 struct drm_device *dev = encoder->dev;
409 struct radeon_device *rdev = dev->dev_private;
410 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
411 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
412 u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
413 u8 tmp;
414
415 if (!ASIC_IS_DCE4(rdev))
416 return panel_mode;
417
418 if (!radeon_connector->con_priv)
419 return panel_mode;
420
421 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
422 /* DP bridge chips */
423 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux,
424 DP_EDP_CONFIGURATION_CAP, valuep: &tmp) == 1) {
425 if (tmp & 1)
426 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
427 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
428 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
429 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
430 else
431 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
432 }
433 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
434 /* eDP */
435 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux,
436 DP_EDP_CONFIGURATION_CAP, valuep: &tmp) == 1) {
437 if (tmp & 1)
438 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
439 }
440 }
441
442 return panel_mode;
443}
444
445void radeon_dp_set_link_config(struct drm_connector *connector,
446 const struct drm_display_mode *mode)
447{
448 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
449 struct radeon_connector_atom_dig *dig_connector;
450 int ret;
451
452 if (!radeon_connector->con_priv)
453 return;
454 dig_connector = radeon_connector->con_priv;
455
456 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
457 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
458 ret = radeon_dp_get_dp_link_config(connector, dpcd: dig_connector->dpcd,
459 pix_clock: mode->clock,
460 dp_lanes: &dig_connector->dp_lane_count,
461 dp_rate: &dig_connector->dp_clock);
462 if (ret) {
463 dig_connector->dp_clock = 0;
464 dig_connector->dp_lane_count = 0;
465 }
466 }
467}
468
469int radeon_dp_mode_valid_helper(struct drm_connector *connector,
470 const struct drm_display_mode *mode)
471{
472 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
473 struct radeon_connector_atom_dig *dig_connector;
474 unsigned dp_clock, dp_lanes;
475 int ret;
476
477 if ((mode->clock > 340000) &&
478 (!radeon_connector_is_dp12_capable(connector)))
479 return MODE_CLOCK_HIGH;
480
481 if (!radeon_connector->con_priv)
482 return MODE_CLOCK_HIGH;
483 dig_connector = radeon_connector->con_priv;
484
485 ret = radeon_dp_get_dp_link_config(connector, dpcd: dig_connector->dpcd,
486 pix_clock: mode->clock,
487 dp_lanes: &dp_lanes,
488 dp_rate: &dp_clock);
489 if (ret)
490 return MODE_CLOCK_HIGH;
491
492 if ((dp_clock == 540000) &&
493 (!radeon_connector_is_dp12_capable(connector)))
494 return MODE_CLOCK_HIGH;
495
496 return MODE_OK;
497}
498
499bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
500{
501 u8 link_status[DP_LINK_STATUS_SIZE];
502 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
503
504 if (drm_dp_dpcd_read_link_status(aux: &radeon_connector->ddc_bus->aux,
505 status: link_status) < 0)
506 return false;
507 if (drm_dp_channel_eq_ok(link_status, lane_count: dig->dp_lane_count))
508 return false;
509 return true;
510}
511
512void radeon_dp_set_rx_power_state(struct drm_connector *connector,
513 u8 power_state)
514{
515 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
516 struct radeon_connector_atom_dig *dig_connector;
517
518 if (!radeon_connector->con_priv)
519 return;
520
521 dig_connector = radeon_connector->con_priv;
522
523 /* power up/down the sink */
524 if (dig_connector->dpcd[0] >= 0x11) {
525 drm_dp_dpcd_writeb(aux: &radeon_connector->ddc_bus->aux,
526 DP_SET_POWER, value: power_state);
527 usleep_range(min: 1000, max: 2000);
528 }
529}
530
531
532struct radeon_dp_link_train_info {
533 struct radeon_device *rdev;
534 struct drm_encoder *encoder;
535 struct drm_connector *connector;
536 int enc_id;
537 int dp_clock;
538 int dp_lane_count;
539 bool tp3_supported;
540 u8 dpcd[DP_RECEIVER_CAP_SIZE];
541 u8 train_set[4];
542 u8 link_status[DP_LINK_STATUS_SIZE];
543 u8 tries;
544 bool use_dpencoder;
545 struct drm_dp_aux *aux;
546};
547
548static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
549{
550 /* set the initial vs/emph on the source */
551 atombios_dig_transmitter_setup(encoder: dp_info->encoder,
552 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
553 lane_num: 0, lane_set: dp_info->train_set[0]); /* sets all lanes at once */
554
555 /* set the vs/emph on the sink */
556 drm_dp_dpcd_write(aux: dp_info->aux, DP_TRAINING_LANE0_SET,
557 buffer: dp_info->train_set, size: dp_info->dp_lane_count);
558}
559
560static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
561{
562 int rtp = 0;
563
564 /* set training pattern on the source */
565 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
566 switch (tp) {
567 case DP_TRAINING_PATTERN_1:
568 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
569 break;
570 case DP_TRAINING_PATTERN_2:
571 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
572 break;
573 case DP_TRAINING_PATTERN_3:
574 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
575 break;
576 }
577 atombios_dig_encoder_setup(encoder: dp_info->encoder, action: rtp, panel_mode: 0);
578 } else {
579 switch (tp) {
580 case DP_TRAINING_PATTERN_1:
581 rtp = 0;
582 break;
583 case DP_TRAINING_PATTERN_2:
584 rtp = 1;
585 break;
586 }
587 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
588 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: rtp);
589 }
590
591 /* enable training pattern on the sink */
592 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_TRAINING_PATTERN_SET, value: tp);
593}
594
595static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
596{
597 struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
598 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
599 u8 tmp;
600
601 /* power up the sink */
602 radeon_dp_set_rx_power_state(connector: dp_info->connector, DP_SET_POWER_D0);
603
604 /* possibly enable downspread on the sink */
605 if (dp_info->dpcd[3] & 0x1)
606 drm_dp_dpcd_writeb(aux: dp_info->aux,
607 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
608 else
609 drm_dp_dpcd_writeb(aux: dp_info->aux,
610 DP_DOWNSPREAD_CTRL, value: 0);
611
612 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
613 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_EDP_CONFIGURATION_SET, value: 1);
614
615 /* set the lane count on the sink */
616 tmp = dp_info->dp_lane_count;
617 if (drm_dp_enhanced_frame_cap(dpcd: dp_info->dpcd))
618 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
619 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_LANE_COUNT_SET, value: tmp);
620
621 /* set the link rate on the sink */
622 tmp = drm_dp_link_rate_to_bw_code(link_rate: dp_info->dp_clock);
623 drm_dp_dpcd_writeb(aux: dp_info->aux, DP_LINK_BW_SET, value: tmp);
624
625 /* start training on the source */
626 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
627 atombios_dig_encoder_setup(encoder: dp_info->encoder,
628 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, panel_mode: 0);
629 else
630 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
631 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: 0);
632
633 /* disable the training pattern on the sink */
634 drm_dp_dpcd_writeb(aux: dp_info->aux,
635 DP_TRAINING_PATTERN_SET,
636 DP_TRAINING_PATTERN_DISABLE);
637
638 return 0;
639}
640
641static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
642{
643 udelay(usec: 400);
644
645 /* disable the training pattern on the sink */
646 drm_dp_dpcd_writeb(aux: dp_info->aux,
647 DP_TRAINING_PATTERN_SET,
648 DP_TRAINING_PATTERN_DISABLE);
649
650 /* disable the training pattern on the source */
651 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
652 atombios_dig_encoder_setup(encoder: dp_info->encoder,
653 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, panel_mode: 0);
654 else
655 radeon_dp_encoder_service(rdev: dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
656 dp_clock: dp_info->dp_clock, ucconfig: dp_info->enc_id, lane_num: 0);
657
658 return 0;
659}
660
661static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
662{
663 bool clock_recovery;
664 u8 voltage;
665 int i;
666
667 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
668 memset(dp_info->train_set, 0, 4);
669 radeon_dp_update_vs_emph(dp_info);
670
671 udelay(usec: 400);
672
673 /* clock recovery loop */
674 clock_recovery = false;
675 dp_info->tries = 0;
676 voltage = 0xff;
677 while (1) {
678 drm_dp_link_train_clock_recovery_delay(aux: dp_info->aux, dpcd: dp_info->dpcd);
679
680 if (drm_dp_dpcd_read_link_status(aux: dp_info->aux,
681 status: dp_info->link_status) < 0) {
682 DRM_ERROR("displayport link status failed\n");
683 break;
684 }
685
686 if (drm_dp_clock_recovery_ok(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count)) {
687 clock_recovery = true;
688 break;
689 }
690
691 for (i = 0; i < dp_info->dp_lane_count; i++) {
692 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
693 break;
694 }
695 if (i == dp_info->dp_lane_count) {
696 DRM_ERROR("clock recovery reached max voltage\n");
697 break;
698 }
699
700 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
701 ++dp_info->tries;
702 if (dp_info->tries == 5) {
703 DRM_ERROR("clock recovery tried 5 times\n");
704 break;
705 }
706 } else
707 dp_info->tries = 0;
708
709 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
710
711 /* Compute new train_set as requested by sink */
712 dp_get_adjust_train(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count, train_set: dp_info->train_set);
713
714 radeon_dp_update_vs_emph(dp_info);
715 }
716 if (!clock_recovery) {
717 DRM_ERROR("clock recovery failed\n");
718 return -1;
719 } else {
720 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
721 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
722 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
723 DP_TRAIN_PRE_EMPHASIS_SHIFT);
724 return 0;
725 }
726}
727
728static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
729{
730 bool channel_eq;
731
732 if (dp_info->tp3_supported)
733 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
734 else
735 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
736
737 /* channel equalization loop */
738 dp_info->tries = 0;
739 channel_eq = false;
740 while (1) {
741 drm_dp_link_train_channel_eq_delay(aux: dp_info->aux, dpcd: dp_info->dpcd);
742
743 if (drm_dp_dpcd_read_link_status(aux: dp_info->aux,
744 status: dp_info->link_status) < 0) {
745 DRM_ERROR("displayport link status failed\n");
746 break;
747 }
748
749 if (drm_dp_channel_eq_ok(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count)) {
750 channel_eq = true;
751 break;
752 }
753
754 /* Try 5 times */
755 if (dp_info->tries > 5) {
756 DRM_ERROR("channel eq failed: 5 tries\n");
757 break;
758 }
759
760 /* Compute new train_set as requested by sink */
761 dp_get_adjust_train(link_status: dp_info->link_status, lane_count: dp_info->dp_lane_count, train_set: dp_info->train_set);
762
763 radeon_dp_update_vs_emph(dp_info);
764 dp_info->tries++;
765 }
766
767 if (!channel_eq) {
768 DRM_ERROR("channel eq failed\n");
769 return -1;
770 } else {
771 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
772 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
773 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
774 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
775 return 0;
776 }
777}
778
779void radeon_dp_link_train(struct drm_encoder *encoder,
780 struct drm_connector *connector)
781{
782 struct drm_device *dev = encoder->dev;
783 struct radeon_device *rdev = dev->dev_private;
784 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
785 struct radeon_encoder_atom_dig *dig;
786 struct radeon_connector *radeon_connector;
787 struct radeon_connector_atom_dig *dig_connector;
788 struct radeon_dp_link_train_info dp_info;
789 int index;
790 u8 tmp, frev, crev;
791
792 if (!radeon_encoder->enc_priv)
793 return;
794 dig = radeon_encoder->enc_priv;
795
796 radeon_connector = to_radeon_connector(connector);
797 if (!radeon_connector->con_priv)
798 return;
799 dig_connector = radeon_connector->con_priv;
800
801 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
802 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
803 return;
804
805 /* DPEncoderService newer than 1.1 can't program properly the
806 * training pattern. When facing such version use the
807 * DIGXEncoderControl (X== 1 | 2)
808 */
809 dp_info.use_dpencoder = true;
810 index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
811 if (atom_parse_cmd_header(ctx: rdev->mode_info.atom_context, index, frev: &frev, crev: &crev)) {
812 if (crev > 1)
813 dp_info.use_dpencoder = false;
814 }
815
816 dp_info.enc_id = 0;
817 if (dig->dig_encoder)
818 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
819 else
820 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
821 if (dig->linkb)
822 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
823 else
824 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
825
826 if (drm_dp_dpcd_readb(aux: &radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, valuep: &tmp)
827 == 1) {
828 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
829 dp_info.tp3_supported = true;
830 else
831 dp_info.tp3_supported = false;
832 } else {
833 dp_info.tp3_supported = false;
834 }
835
836 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
837 dp_info.rdev = rdev;
838 dp_info.encoder = encoder;
839 dp_info.connector = connector;
840 dp_info.dp_lane_count = dig_connector->dp_lane_count;
841 dp_info.dp_clock = dig_connector->dp_clock;
842 dp_info.aux = &radeon_connector->ddc_bus->aux;
843
844 if (radeon_dp_link_train_init(dp_info: &dp_info))
845 goto done;
846 if (radeon_dp_link_train_cr(dp_info: &dp_info))
847 goto done;
848 if (radeon_dp_link_train_ce(dp_info: &dp_info))
849 goto done;
850done:
851 if (radeon_dp_link_train_finish(dp_info: &dp_info))
852 return;
853}
854

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