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/amdgpu_drm.h>
29 #include <drm/display/drm_dp_helper.h>
30
31 #include "amdgpu.h"
32
33 #include "atom.h"
34 #include "atom-bits.h"
35 #include "atombios_encoders.h"
36 #include "atombios_dp.h"
37 #include "amdgpu_connectors.h"
38 #include "amdgpu_atombios.h"
39
40 /* move these to drm_dp_helper.c/h */
41 #define DP_LINK_CONFIGURATION_SIZE 9
42 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
43
44 static char *voltage_names[] = {
45 "0.4V", "0.6V", "0.8V", "1.2V"
46 };
47 static char *pre_emph_names[] = {
48 "0dB", "3.5dB", "6dB", "9.5dB"
49 };
50
51 /***** amdgpu AUX functions *****/
52
53 union aux_channel_transaction {
54 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
55 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
56 };
57
amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan * chan,u8 * send,int send_bytes,u8 * recv,int recv_size,u8 delay,u8 * ack)58 static int amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan *chan,
59 u8 *send, int send_bytes,
60 u8 *recv, int recv_size,
61 u8 delay, u8 *ack)
62 {
63 struct drm_device *dev = chan->dev;
64 struct amdgpu_device *adev = drm_to_adev(dev);
65 union aux_channel_transaction args;
66 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
67 unsigned char *base;
68 int recv_bytes;
69 int r = 0;
70
71 memset(&args, 0, sizeof(args));
72
73 mutex_lock(&chan->mutex);
74
75 base = (unsigned char *)(adev->mode_info.atom_context->scratch + 1);
76
77 amdgpu_atombios_copy_swap(base, send, send_bytes, true);
78
79 args.v2.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
80 args.v2.lpDataOut = cpu_to_le16((u16)(16 + 4));
81 args.v2.ucDataOutLen = 0;
82 args.v2.ucChannelID = chan->rec.i2c_id;
83 args.v2.ucDelay = delay / 10;
84 args.v2.ucHPD_ID = chan->rec.hpd;
85
86 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args, sizeof(args));
87
88 *ack = args.v2.ucReplyStatus;
89
90 /* timeout */
91 if (args.v2.ucReplyStatus == 1) {
92 r = -ETIMEDOUT;
93 goto done;
94 }
95
96 /* flags not zero */
97 if (args.v2.ucReplyStatus == 2) {
98 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
99 r = -EIO;
100 goto done;
101 }
102
103 /* error */
104 if (args.v2.ucReplyStatus == 3) {
105 DRM_DEBUG_KMS("dp_aux_ch error\n");
106 r = -EIO;
107 goto done;
108 }
109
110 recv_bytes = args.v1.ucDataOutLen;
111 if (recv_bytes > recv_size)
112 recv_bytes = recv_size;
113
114 if (recv && recv_size)
115 amdgpu_atombios_copy_swap(recv, base + 16, recv_bytes, false);
116
117 r = recv_bytes;
118 done:
119 mutex_unlock(&chan->mutex);
120
121 return r;
122 }
123
124 #define BARE_ADDRESS_SIZE 3
125 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
126
127 static ssize_t
amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)128 amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
129 {
130 struct amdgpu_i2c_chan *chan =
131 container_of(aux, struct amdgpu_i2c_chan, aux);
132 int ret;
133 u8 tx_buf[20];
134 size_t tx_size;
135 u8 ack, delay = 0;
136
137 if (WARN_ON(msg->size > 16))
138 return -E2BIG;
139
140 tx_buf[0] = msg->address & 0xff;
141 tx_buf[1] = msg->address >> 8;
142 tx_buf[2] = (msg->request << 4) |
143 ((msg->address >> 16) & 0xf);
144 tx_buf[3] = msg->size ? (msg->size - 1) : 0;
145
146 switch (msg->request & ~DP_AUX_I2C_MOT) {
147 case DP_AUX_NATIVE_WRITE:
148 case DP_AUX_I2C_WRITE:
149 /* tx_size needs to be 4 even for bare address packets since the atom
150 * table needs the info in tx_buf[3].
151 */
152 tx_size = HEADER_SIZE + msg->size;
153 if (msg->size == 0)
154 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
155 else
156 tx_buf[3] |= tx_size << 4;
157 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
158 ret = amdgpu_atombios_dp_process_aux_ch(chan,
159 tx_buf, tx_size, NULL, 0, delay, &ack);
160 if (ret >= 0)
161 /* Return payload size. */
162 ret = msg->size;
163 break;
164 case DP_AUX_NATIVE_READ:
165 case DP_AUX_I2C_READ:
166 /* tx_size needs to be 4 even for bare address packets since the atom
167 * table needs the info in tx_buf[3].
168 */
169 tx_size = HEADER_SIZE;
170 if (msg->size == 0)
171 tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
172 else
173 tx_buf[3] |= tx_size << 4;
174 ret = amdgpu_atombios_dp_process_aux_ch(chan,
175 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
176 break;
177 default:
178 ret = -EINVAL;
179 break;
180 }
181
182 if (ret >= 0)
183 msg->reply = ack >> 4;
184
185 return ret;
186 }
187
amdgpu_atombios_dp_aux_init(struct amdgpu_connector * amdgpu_connector)188 void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector)
189 {
190 amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
191 amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
192 amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev;
193
194 drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
195 amdgpu_connector->ddc_bus->has_aux = true;
196 }
197
198 /***** general DP utility functions *****/
199
200 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3
201 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3
202
amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],int lane_count,u8 train_set[4])203 static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
204 int lane_count,
205 u8 train_set[4])
206 {
207 u8 v = 0;
208 u8 p = 0;
209 int lane;
210
211 for (lane = 0; lane < lane_count; lane++) {
212 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
213 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
214
215 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
216 lane,
217 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
218 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
219
220 if (this_v > v)
221 v = this_v;
222 if (this_p > p)
223 p = this_p;
224 }
225
226 if (v >= DP_VOLTAGE_MAX)
227 v |= DP_TRAIN_MAX_SWING_REACHED;
228
229 if (p >= DP_PRE_EMPHASIS_MAX)
230 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
231
232 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
233 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
234 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
235
236 for (lane = 0; lane < 4; lane++)
237 train_set[lane] = v | p;
238 }
239
240 /* convert bits per color to bits per pixel */
241 /* get bpc from the EDID */
amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc)242 static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc)
243 {
244 if (bpc == 0)
245 return 24;
246 else
247 return bpc * 3;
248 }
249
250 /***** amdgpu specific DP functions *****/
251
amdgpu_atombios_dp_get_dp_link_config(struct drm_connector * connector,const u8 dpcd[DP_DPCD_SIZE],unsigned pix_clock,unsigned * dp_lanes,unsigned * dp_rate)252 static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector,
253 const u8 dpcd[DP_DPCD_SIZE],
254 unsigned pix_clock,
255 unsigned *dp_lanes, unsigned *dp_rate)
256 {
257 unsigned bpp =
258 amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector));
259 static const unsigned link_rates[3] = { 162000, 270000, 540000 };
260 unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
261 unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
262 unsigned lane_num, i, max_pix_clock;
263
264 if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) ==
265 ENCODER_OBJECT_ID_NUTMEG) {
266 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
267 max_pix_clock = (lane_num * 270000 * 8) / bpp;
268 if (max_pix_clock >= pix_clock) {
269 *dp_lanes = lane_num;
270 *dp_rate = 270000;
271 return 0;
272 }
273 }
274 } else {
275 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
276 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
277 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
278 if (max_pix_clock >= pix_clock) {
279 *dp_lanes = lane_num;
280 *dp_rate = link_rates[i];
281 return 0;
282 }
283 }
284 }
285 }
286
287 return -EINVAL;
288 }
289
amdgpu_atombios_dp_encoder_service(struct amdgpu_device * adev,int action,int dp_clock,u8 ucconfig,u8 lane_num)290 static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev,
291 int action, int dp_clock,
292 u8 ucconfig, u8 lane_num)
293 {
294 DP_ENCODER_SERVICE_PARAMETERS args;
295 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
296
297 memset(&args, 0, sizeof(args));
298 args.ucLinkClock = dp_clock / 10;
299 args.ucConfig = ucconfig;
300 args.ucAction = action;
301 args.ucLaneNum = lane_num;
302 args.ucStatus = 0;
303
304 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args, sizeof(args));
305 return args.ucStatus;
306 }
307
amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector * amdgpu_connector)308 u8 amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector *amdgpu_connector)
309 {
310 struct drm_device *dev = amdgpu_connector->base.dev;
311 struct amdgpu_device *adev = drm_to_adev(dev);
312
313 return amdgpu_atombios_dp_encoder_service(adev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
314 amdgpu_connector->ddc_bus->rec.i2c_id, 0);
315 }
316
amdgpu_atombios_dp_probe_oui(struct amdgpu_connector * amdgpu_connector)317 static void amdgpu_atombios_dp_probe_oui(struct amdgpu_connector *amdgpu_connector)
318 {
319 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
320 u8 buf[3];
321
322 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
323 return;
324
325 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
326 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
327 buf[0], buf[1], buf[2]);
328
329 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
330 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
331 buf[0], buf[1], buf[2]);
332 }
333
amdgpu_atombios_dp_ds_ports(struct amdgpu_connector * amdgpu_connector)334 static void amdgpu_atombios_dp_ds_ports(struct amdgpu_connector *amdgpu_connector)
335 {
336 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
337 int ret;
338
339 if (dig_connector->dpcd[DP_DPCD_REV] > 0x10) {
340 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux,
341 DP_DOWNSTREAM_PORT_0,
342 dig_connector->downstream_ports,
343 DP_MAX_DOWNSTREAM_PORTS);
344 if (ret)
345 memset(dig_connector->downstream_ports, 0,
346 DP_MAX_DOWNSTREAM_PORTS);
347 }
348 }
349
amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector * amdgpu_connector)350 int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector)
351 {
352 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
353 u8 msg[DP_DPCD_SIZE];
354 int ret;
355
356 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV,
357 msg, DP_DPCD_SIZE);
358 if (ret == DP_DPCD_SIZE) {
359 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
360
361 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
362 dig_connector->dpcd);
363
364 amdgpu_atombios_dp_probe_oui(amdgpu_connector);
365 amdgpu_atombios_dp_ds_ports(amdgpu_connector);
366 return 0;
367 }
368
369 dig_connector->dpcd[0] = 0;
370 return -EINVAL;
371 }
372
amdgpu_atombios_dp_get_panel_mode(struct drm_encoder * encoder,struct drm_connector * connector)373 int amdgpu_atombios_dp_get_panel_mode(struct drm_encoder *encoder,
374 struct drm_connector *connector)
375 {
376 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
377 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
378 u16 dp_bridge = amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector);
379 u8 tmp;
380
381 if (!amdgpu_connector->con_priv)
382 return panel_mode;
383
384 if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
385 /* DP bridge chips */
386 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
387 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
388 if (tmp & 1)
389 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
390 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
391 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
392 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
393 else
394 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
395 }
396 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
397 /* eDP */
398 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
399 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
400 if (tmp & 1)
401 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
402 }
403 }
404
405 return panel_mode;
406 }
407
amdgpu_atombios_dp_set_link_config(struct drm_connector * connector,const struct drm_display_mode * mode)408 void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector,
409 const struct drm_display_mode *mode)
410 {
411 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
412 struct amdgpu_connector_atom_dig *dig_connector;
413 int ret;
414
415 if (!amdgpu_connector->con_priv)
416 return;
417 dig_connector = amdgpu_connector->con_priv;
418
419 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
420 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
421 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
422 mode->clock,
423 &dig_connector->dp_lane_count,
424 &dig_connector->dp_clock);
425 if (ret) {
426 dig_connector->dp_clock = 0;
427 dig_connector->dp_lane_count = 0;
428 }
429 }
430 }
431
amdgpu_atombios_dp_mode_valid_helper(struct drm_connector * connector,struct drm_display_mode * mode)432 int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector,
433 struct drm_display_mode *mode)
434 {
435 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
436 struct amdgpu_connector_atom_dig *dig_connector;
437 unsigned dp_lanes, dp_clock;
438 int ret;
439
440 if (!amdgpu_connector->con_priv)
441 return MODE_CLOCK_HIGH;
442 dig_connector = amdgpu_connector->con_priv;
443
444 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
445 mode->clock, &dp_lanes, &dp_clock);
446 if (ret)
447 return MODE_CLOCK_HIGH;
448
449 if ((dp_clock == 540000) &&
450 (!amdgpu_connector_is_dp12_capable(connector)))
451 return MODE_CLOCK_HIGH;
452
453 return MODE_OK;
454 }
455
amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector * amdgpu_connector)456 bool amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector *amdgpu_connector)
457 {
458 u8 link_status[DP_LINK_STATUS_SIZE];
459 struct amdgpu_connector_atom_dig *dig = amdgpu_connector->con_priv;
460
461 if (drm_dp_dpcd_read_link_status(&amdgpu_connector->ddc_bus->aux, link_status)
462 <= 0)
463 return false;
464 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
465 return false;
466 return true;
467 }
468
amdgpu_atombios_dp_set_rx_power_state(struct drm_connector * connector,u8 power_state)469 void amdgpu_atombios_dp_set_rx_power_state(struct drm_connector *connector,
470 u8 power_state)
471 {
472 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
473 struct amdgpu_connector_atom_dig *dig_connector;
474
475 if (!amdgpu_connector->con_priv)
476 return;
477
478 dig_connector = amdgpu_connector->con_priv;
479
480 /* power up/down the sink */
481 if (dig_connector->dpcd[0] >= 0x11) {
482 drm_dp_dpcd_writeb(&amdgpu_connector->ddc_bus->aux,
483 DP_SET_POWER, power_state);
484 usleep_range(1000, 2000);
485 }
486 }
487
488 struct amdgpu_atombios_dp_link_train_info {
489 struct amdgpu_device *adev;
490 struct drm_encoder *encoder;
491 struct drm_connector *connector;
492 int dp_clock;
493 int dp_lane_count;
494 bool tp3_supported;
495 u8 dpcd[DP_RECEIVER_CAP_SIZE];
496 u8 train_set[4];
497 u8 link_status[DP_LINK_STATUS_SIZE];
498 u8 tries;
499 struct drm_dp_aux *aux;
500 };
501
502 static void
amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info * dp_info)503 amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info *dp_info)
504 {
505 /* set the initial vs/emph on the source */
506 amdgpu_atombios_encoder_setup_dig_transmitter(dp_info->encoder,
507 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
508 0, dp_info->train_set[0]); /* sets all lanes at once */
509
510 /* set the vs/emph on the sink */
511 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
512 dp_info->train_set, dp_info->dp_lane_count);
513 }
514
515 static void
amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info * dp_info,int tp)516 amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info *dp_info, int tp)
517 {
518 int rtp = 0;
519
520 /* set training pattern on the source */
521 switch (tp) {
522 case DP_TRAINING_PATTERN_1:
523 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
524 break;
525 case DP_TRAINING_PATTERN_2:
526 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
527 break;
528 case DP_TRAINING_PATTERN_3:
529 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
530 break;
531 }
532 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, rtp, 0);
533
534 /* enable training pattern on the sink */
535 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
536 }
537
538 static int
amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info * dp_info)539 amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info *dp_info)
540 {
541 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(dp_info->encoder);
542 struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv;
543 u8 tmp;
544
545 /* power up the sink */
546 amdgpu_atombios_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
547
548 /* possibly enable downspread on the sink */
549 if (dp_info->dpcd[3] & 0x1)
550 drm_dp_dpcd_writeb(dp_info->aux,
551 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
552 else
553 drm_dp_dpcd_writeb(dp_info->aux,
554 DP_DOWNSPREAD_CTRL, 0);
555
556 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
557 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
558
559 /* set the lane count on the sink */
560 tmp = dp_info->dp_lane_count;
561 if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
562 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
563 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
564
565 /* set the link rate on the sink */
566 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
567 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
568
569 /* start training on the source */
570 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
571 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
572
573 /* disable the training pattern on the sink */
574 drm_dp_dpcd_writeb(dp_info->aux,
575 DP_TRAINING_PATTERN_SET,
576 DP_TRAINING_PATTERN_DISABLE);
577
578 return 0;
579 }
580
581 static int
amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info * dp_info)582 amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info *dp_info)
583 {
584 udelay(400);
585
586 /* disable the training pattern on the sink */
587 drm_dp_dpcd_writeb(dp_info->aux,
588 DP_TRAINING_PATTERN_SET,
589 DP_TRAINING_PATTERN_DISABLE);
590
591 /* disable the training pattern on the source */
592 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
593 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
594
595 return 0;
596 }
597
598 static int
amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info * dp_info)599 amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info *dp_info)
600 {
601 bool clock_recovery;
602 u8 voltage;
603 int i;
604
605 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
606 memset(dp_info->train_set, 0, 4);
607 amdgpu_atombios_dp_update_vs_emph(dp_info);
608
609 udelay(400);
610
611 /* clock recovery loop */
612 clock_recovery = false;
613 dp_info->tries = 0;
614 voltage = 0xff;
615 while (1) {
616 drm_dp_link_train_clock_recovery_delay(dp_info->aux, dp_info->dpcd);
617
618 if (drm_dp_dpcd_read_link_status(dp_info->aux,
619 dp_info->link_status) <= 0) {
620 DRM_ERROR("displayport link status failed\n");
621 break;
622 }
623
624 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
625 clock_recovery = true;
626 break;
627 }
628
629 for (i = 0; i < dp_info->dp_lane_count; i++) {
630 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
631 break;
632 }
633 if (i == dp_info->dp_lane_count) {
634 DRM_ERROR("clock recovery reached max voltage\n");
635 break;
636 }
637
638 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
639 ++dp_info->tries;
640 if (dp_info->tries == 5) {
641 DRM_ERROR("clock recovery tried 5 times\n");
642 break;
643 }
644 } else
645 dp_info->tries = 0;
646
647 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
648
649 /* Compute new train_set as requested by sink */
650 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
651 dp_info->train_set);
652
653 amdgpu_atombios_dp_update_vs_emph(dp_info);
654 }
655 if (!clock_recovery) {
656 DRM_ERROR("clock recovery failed\n");
657 return -1;
658 } else {
659 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
660 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
661 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
662 DP_TRAIN_PRE_EMPHASIS_SHIFT);
663 return 0;
664 }
665 }
666
667 static int
amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info * dp_info)668 amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info *dp_info)
669 {
670 bool channel_eq;
671
672 if (dp_info->tp3_supported)
673 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
674 else
675 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
676
677 /* channel equalization loop */
678 dp_info->tries = 0;
679 channel_eq = false;
680 while (1) {
681 drm_dp_link_train_channel_eq_delay(dp_info->aux, dp_info->dpcd);
682
683 if (drm_dp_dpcd_read_link_status(dp_info->aux,
684 dp_info->link_status) <= 0) {
685 DRM_ERROR("displayport link status failed\n");
686 break;
687 }
688
689 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
690 channel_eq = true;
691 break;
692 }
693
694 /* Try 5 times */
695 if (dp_info->tries > 5) {
696 DRM_ERROR("channel eq failed: 5 tries\n");
697 break;
698 }
699
700 /* Compute new train_set as requested by sink */
701 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
702 dp_info->train_set);
703
704 amdgpu_atombios_dp_update_vs_emph(dp_info);
705 dp_info->tries++;
706 }
707
708 if (!channel_eq) {
709 DRM_ERROR("channel eq failed\n");
710 return -1;
711 } else {
712 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
713 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
714 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
715 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
716 return 0;
717 }
718 }
719
amdgpu_atombios_dp_link_train(struct drm_encoder * encoder,struct drm_connector * connector)720 void amdgpu_atombios_dp_link_train(struct drm_encoder *encoder,
721 struct drm_connector *connector)
722 {
723 struct drm_device *dev = encoder->dev;
724 struct amdgpu_device *adev = drm_to_adev(dev);
725 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
726 struct amdgpu_connector *amdgpu_connector;
727 struct amdgpu_connector_atom_dig *dig_connector;
728 struct amdgpu_atombios_dp_link_train_info dp_info;
729 u8 tmp;
730
731 if (!amdgpu_encoder->enc_priv)
732 return;
733
734 amdgpu_connector = to_amdgpu_connector(connector);
735 if (!amdgpu_connector->con_priv)
736 return;
737 dig_connector = amdgpu_connector->con_priv;
738
739 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
740 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
741 return;
742
743 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
744 == 1) {
745 if (tmp & DP_TPS3_SUPPORTED)
746 dp_info.tp3_supported = true;
747 else
748 dp_info.tp3_supported = false;
749 } else {
750 dp_info.tp3_supported = false;
751 }
752
753 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
754 dp_info.adev = adev;
755 dp_info.encoder = encoder;
756 dp_info.connector = connector;
757 dp_info.dp_lane_count = dig_connector->dp_lane_count;
758 dp_info.dp_clock = dig_connector->dp_clock;
759 dp_info.aux = &amdgpu_connector->ddc_bus->aux;
760
761 if (amdgpu_atombios_dp_link_train_init(&dp_info))
762 goto done;
763 if (amdgpu_atombios_dp_link_train_cr(&dp_info))
764 goto done;
765 if (amdgpu_atombios_dp_link_train_ce(&dp_info))
766 goto done;
767 done:
768 if (amdgpu_atombios_dp_link_train_finish(&dp_info))
769 return;
770 }
771