1 /*
2 * Copyright 2009 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs
23 */
24
25 #include <drm/display/drm_dp_helper.h>
26
27 #include "nouveau_drv.h"
28 #include "nouveau_connector.h"
29 #include "nouveau_encoder.h"
30 #include "nouveau_crtc.h"
31
32 #include <nvif/if0011.h>
33
34 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
35 static int nouveau_mst = 1;
36 module_param_named(mst, nouveau_mst, int, 0400);
37
38 static bool
nouveau_dp_has_sink_count(struct drm_connector * connector,struct nouveau_encoder * outp)39 nouveau_dp_has_sink_count(struct drm_connector *connector,
40 struct nouveau_encoder *outp)
41 {
42 return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
43 }
44
45 static bool
nouveau_dp_probe_lttpr(struct nouveau_encoder * outp)46 nouveau_dp_probe_lttpr(struct nouveau_encoder *outp)
47 {
48 u8 rev, size = sizeof(rev);
49 int ret;
50
51 ret = nvif_outp_dp_aux_xfer(&outp->outp, DP_AUX_NATIVE_READ, &size,
52 DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
53 &rev);
54 if (ret || size < sizeof(rev) || rev < 0x14)
55 return false;
56
57 return true;
58 }
59
60 static enum drm_connector_status
nouveau_dp_probe_dpcd(struct nouveau_connector * nv_connector,struct nouveau_encoder * outp)61 nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
62 struct nouveau_encoder *outp)
63 {
64 struct drm_connector *connector = &nv_connector->base;
65 struct drm_dp_aux *aux = &nv_connector->aux;
66 struct nv50_mstm *mstm = NULL;
67 enum drm_connector_status status = connector_status_disconnected;
68 int ret;
69 u8 *dpcd = outp->dp.dpcd;
70
71 outp->dp.lttpr.nr = 0;
72 outp->dp.rate_nr = 0;
73 outp->dp.link_nr = 0;
74 outp->dp.link_bw = 0;
75
76 if (connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
77 nouveau_dp_probe_lttpr(outp) &&
78 !drm_dp_read_dpcd_caps(aux, dpcd) &&
79 !drm_dp_read_lttpr_common_caps(aux, dpcd, outp->dp.lttpr.caps)) {
80 int nr = drm_dp_lttpr_count(outp->dp.lttpr.caps);
81
82 if (!drm_dp_lttpr_init(aux, nr))
83 outp->dp.lttpr.nr = nr;
84 }
85
86 ret = drm_dp_read_dpcd_caps(aux, dpcd);
87 if (ret < 0)
88 goto out;
89
90 outp->dp.link_nr = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
91 if (outp->dcb->dpconf.link_nr < outp->dp.link_nr)
92 outp->dp.link_nr = outp->dcb->dpconf.link_nr;
93
94 if (outp->dp.lttpr.nr) {
95 int links = drm_dp_lttpr_max_lane_count(outp->dp.lttpr.caps);
96
97 if (links && links < outp->dp.link_nr)
98 outp->dp.link_nr = links;
99 }
100
101 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
102 __le16 rates[DP_MAX_SUPPORTED_RATES];
103
104 ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, rates, sizeof(rates));
105 if (ret == sizeof(rates)) {
106 for (int i = 0; i < ARRAY_SIZE(rates); i++) {
107 u32 rate = (le16_to_cpu(rates[i]) * 200) / 10;
108 int j;
109
110 if (!rate)
111 break;
112
113 for (j = 0; j < outp->dp.rate_nr; j++) {
114 if (rate > outp->dp.rate[j].rate) {
115 for (int k = outp->dp.rate_nr; k > j; k--)
116 outp->dp.rate[k] = outp->dp.rate[k - 1];
117 break;
118 }
119 }
120
121 outp->dp.rate[j].dpcd = i;
122 outp->dp.rate[j].rate = rate;
123 outp->dp.rate_nr++;
124 }
125 }
126 }
127
128 if (!outp->dp.rate_nr) {
129 const u32 rates[] = { 810000, 540000, 270000, 162000 };
130 u32 max_rate = dpcd[DP_MAX_LINK_RATE] * 27000;
131
132 if (outp->dp.lttpr.nr) {
133 int rate = drm_dp_lttpr_max_link_rate(outp->dp.lttpr.caps);
134
135 if (rate && rate < max_rate)
136 max_rate = rate;
137 }
138
139 max_rate = min_t(int, max_rate, outp->dcb->dpconf.link_bw);
140
141 for (int i = 0; i < ARRAY_SIZE(rates); i++) {
142 if (rates[i] <= max_rate) {
143 outp->dp.rate[outp->dp.rate_nr].dpcd = -1;
144 outp->dp.rate[outp->dp.rate_nr].rate = rates[i];
145 outp->dp.rate_nr++;
146 }
147 }
148
149 if (WARN_ON(!outp->dp.rate_nr))
150 goto out;
151 }
152
153 ret = nvif_outp_dp_rates(&outp->outp, outp->dp.rate, outp->dp.rate_nr);
154 if (ret)
155 goto out;
156
157 for (int i = 0; i < outp->dp.rate_nr; i++) {
158 u32 link_bw = outp->dp.rate[i].rate;
159
160 if (link_bw > outp->dp.link_bw)
161 outp->dp.link_bw = link_bw;
162 }
163
164 ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
165 if (ret < 0)
166 goto out;
167
168 if (nouveau_mst) {
169 mstm = outp->dp.mstm;
170 if (mstm)
171 mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd) == DRM_DP_MST;
172 }
173
174 if (nouveau_dp_has_sink_count(connector, outp)) {
175 ret = drm_dp_read_sink_count(aux);
176 if (ret < 0)
177 goto out;
178
179 outp->dp.sink_count = ret;
180
181 /*
182 * Dongle connected, but no display. Don't bother reading
183 * downstream port info
184 */
185 if (!outp->dp.sink_count)
186 return connector_status_disconnected;
187 }
188
189 ret = drm_dp_read_downstream_info(aux, dpcd,
190 outp->dp.downstream_ports);
191 if (ret < 0)
192 goto out;
193
194 status = connector_status_connected;
195 out:
196 if (status != connector_status_connected) {
197 /* Clear any cached info */
198 outp->dp.sink_count = 0;
199 }
200 return status;
201 }
202
203 int
nouveau_dp_detect(struct nouveau_connector * nv_connector,struct nouveau_encoder * nv_encoder)204 nouveau_dp_detect(struct nouveau_connector *nv_connector,
205 struct nouveau_encoder *nv_encoder)
206 {
207 struct drm_device *dev = nv_encoder->base.base.dev;
208 struct nouveau_drm *drm = nouveau_drm(dev);
209 struct drm_connector *connector = &nv_connector->base;
210 struct nv50_mstm *mstm = nv_encoder->dp.mstm;
211 enum drm_connector_status status;
212 u8 *dpcd = nv_encoder->dp.dpcd;
213 int ret = NOUVEAU_DP_NONE, hpd;
214
215 /* eDP ports don't support hotplugging - so there's no point in probing eDP ports unless we
216 * haven't probed them once before.
217 */
218 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
219 if (connector->status == connector_status_connected)
220 return NOUVEAU_DP_SST;
221 else if (connector->status == connector_status_disconnected)
222 return NOUVEAU_DP_NONE;
223 }
224
225 // Ensure that the aux bus is enabled for probing
226 drm_dp_dpcd_set_powered(&nv_connector->aux, true);
227
228 mutex_lock(&nv_encoder->dp.hpd_irq_lock);
229 if (mstm) {
230 /* If we're not ready to handle MST state changes yet, just
231 * report the last status of the connector. We'll reprobe it
232 * once we've resumed.
233 */
234 if (mstm->suspended) {
235 if (mstm->is_mst)
236 ret = NOUVEAU_DP_MST;
237 else if (connector->status ==
238 connector_status_connected)
239 ret = NOUVEAU_DP_SST;
240
241 goto out;
242 }
243 }
244
245 hpd = nvif_outp_detect(&nv_encoder->outp);
246 if (hpd == NOT_PRESENT) {
247 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
248 goto out;
249 }
250 nvif_outp_dp_aux_pwr(&nv_encoder->outp, true);
251
252 status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
253 if (status == connector_status_disconnected) {
254 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
255 goto out;
256 }
257
258 /* If we're in MST mode, we're done here */
259 if (mstm && mstm->can_mst && mstm->is_mst) {
260 ret = NOUVEAU_DP_MST;
261 goto out;
262 }
263
264 NV_DEBUG(drm, "sink dpcd version: 0x%02x\n", dpcd[DP_DPCD_REV]);
265 for (int i = 0; i < nv_encoder->dp.rate_nr; i++)
266 NV_DEBUG(drm, "sink rate %d: %d\n", i, nv_encoder->dp.rate[i].rate);
267
268 NV_DEBUG(drm, "encoder: %dx%d\n", nv_encoder->dcb->dpconf.link_nr,
269 nv_encoder->dcb->dpconf.link_bw);
270 NV_DEBUG(drm, "maximum: %dx%d\n", nv_encoder->dp.link_nr,
271 nv_encoder->dp.link_bw);
272
273 if (mstm && mstm->can_mst) {
274 ret = nv50_mstm_detect(nv_encoder);
275 if (ret == 1) {
276 ret = NOUVEAU_DP_MST;
277 goto out;
278 } else if (ret != 0) {
279 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
280 goto out;
281 }
282 }
283 ret = NOUVEAU_DP_SST;
284
285 out:
286 if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
287 nv50_mstm_remove(mstm);
288
289 /* GSP doesn't like when we try to do aux transactions on a port it considers disconnected,
290 * and since we don't really have a usecase for that anyway - just disable the aux bus here
291 * if we've decided the connector is disconnected
292 */
293 if (ret == NOUVEAU_DP_NONE)
294 drm_dp_dpcd_set_powered(&nv_connector->aux, false);
295
296 mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
297 return ret;
298 }
299
300 void
nouveau_dp_power_down(struct nouveau_encoder * outp)301 nouveau_dp_power_down(struct nouveau_encoder *outp)
302 {
303 struct drm_dp_aux *aux = &outp->conn->aux;
304 int ret;
305 u8 pwr;
306
307 mutex_lock(&outp->dp.hpd_irq_lock);
308
309 ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr);
310 if (ret == 1) {
311 pwr &= ~DP_SET_POWER_MASK;
312 pwr |= DP_SET_POWER_D3;
313 drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);
314 }
315
316 outp->dp.lt.nr = 0;
317 mutex_unlock(&outp->dp.hpd_irq_lock);
318 }
319
320 static bool
nouveau_dp_train_link(struct nouveau_encoder * outp,bool retrain)321 nouveau_dp_train_link(struct nouveau_encoder *outp, bool retrain)
322 {
323 struct drm_dp_aux *aux = &outp->conn->aux;
324 bool post_lt = false;
325 int ret, retries = 0;
326
327 if ( (outp->dp.dpcd[DP_MAX_LANE_COUNT] & 0x20) &&
328 !(outp->dp.dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED))
329 post_lt = true;
330
331 retry:
332 ret = nvif_outp_dp_train(&outp->outp, outp->dp.dpcd,
333 outp->dp.lttpr.nr,
334 outp->dp.lt.nr,
335 outp->dp.lt.bw,
336 outp->dp.lt.mst,
337 post_lt,
338 retrain);
339 if (ret)
340 return false;
341
342 if (post_lt) {
343 u8 stat[DP_LINK_STATUS_SIZE];
344 u8 prev[2];
345 u8 time = 0, adjusts = 0, tmp;
346
347 ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
348 if (ret)
349 return false;
350
351 for (;;) {
352 if (!drm_dp_channel_eq_ok(stat, outp->dp.lt.nr)) {
353 ret = 1;
354 break;
355 }
356
357 if (!(stat[2] & 0x02))
358 break;
359
360 msleep(5);
361 time += 5;
362
363 memcpy(prev, &stat[4], sizeof(prev));
364 ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
365 if (ret)
366 break;
367
368 if (!memcmp(prev, &stat[4], sizeof(prev))) {
369 if (time > 200)
370 break;
371 } else {
372 u8 pe[4], vs[4];
373
374 if (adjusts++ == 6)
375 break;
376
377 for (int i = 0; i < outp->dp.lt.nr; i++) {
378 pe[i] = drm_dp_get_adjust_request_pre_emphasis(stat, i) >>
379 DP_TRAIN_PRE_EMPHASIS_SHIFT;
380 vs[i] = drm_dp_get_adjust_request_voltage(stat, i) >>
381 DP_TRAIN_VOLTAGE_SWING_SHIFT;
382 }
383
384 ret = nvif_outp_dp_drive(&outp->outp, outp->dp.lt.nr, pe, vs);
385 if (ret)
386 break;
387
388 time = 0;
389 }
390 }
391
392 if (drm_dp_dpcd_readb(aux, DP_LANE_COUNT_SET, &tmp) == 1) {
393 tmp &= ~0x20;
394 drm_dp_dpcd_writeb(aux, DP_LANE_COUNT_SET, tmp);
395 }
396 }
397
398 if (ret == 1 && retries++ < 3)
399 goto retry;
400
401 return ret == 0;
402 }
403
404 bool
nouveau_dp_train(struct nouveau_encoder * outp,bool mst,u32 khz,u8 bpc)405 nouveau_dp_train(struct nouveau_encoder *outp, bool mst, u32 khz, u8 bpc)
406 {
407 struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);
408 struct drm_dp_aux *aux = &outp->conn->aux;
409 u32 min_rate;
410 u8 pwr;
411 bool ret = true;
412
413 if (mst)
414 min_rate = outp->dp.link_nr * outp->dp.rate[0].rate;
415 else
416 min_rate = DIV_ROUND_UP(khz * bpc * 3, 8);
417
418 NV_DEBUG(drm, "%s link training (mst:%d min_rate:%d)\n",
419 outp->base.base.name, mst, min_rate);
420
421 mutex_lock(&outp->dp.hpd_irq_lock);
422
423 if (drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr) == 1) {
424 if ((pwr & DP_SET_POWER_MASK) != DP_SET_POWER_D0) {
425 pwr &= ~DP_SET_POWER_MASK;
426 pwr |= DP_SET_POWER_D0;
427 drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);
428 }
429 }
430
431 for (int nr = outp->dp.link_nr; nr; nr >>= 1) {
432 for (int rate = 0; rate < outp->dp.rate_nr; rate++) {
433 if (outp->dp.rate[rate].rate * nr >= min_rate) {
434 outp->dp.lt.nr = nr;
435 outp->dp.lt.bw = outp->dp.rate[rate].rate;
436 outp->dp.lt.mst = mst;
437 if (nouveau_dp_train_link(outp, false))
438 goto done;
439 }
440 }
441 }
442
443 ret = false;
444 done:
445 mutex_unlock(&outp->dp.hpd_irq_lock);
446 return ret;
447 }
448
449 static bool
nouveau_dp_link_check_locked(struct nouveau_encoder * outp)450 nouveau_dp_link_check_locked(struct nouveau_encoder *outp)
451 {
452 u8 link_status[DP_LINK_STATUS_SIZE];
453
454 if (!outp || !outp->dp.lt.nr)
455 return true;
456
457 if (drm_dp_dpcd_read_phy_link_status(&outp->conn->aux, DP_PHY_DPRX, link_status) < 0)
458 return false;
459
460 if (drm_dp_channel_eq_ok(link_status, outp->dp.lt.nr))
461 return true;
462
463 return nouveau_dp_train_link(outp, true);
464 }
465
466 bool
nouveau_dp_link_check(struct nouveau_connector * nv_connector)467 nouveau_dp_link_check(struct nouveau_connector *nv_connector)
468 {
469 struct nouveau_encoder *outp = nv_connector->dp_encoder;
470 bool link_ok = true;
471
472 if (outp) {
473 mutex_lock(&outp->dp.hpd_irq_lock);
474 if (outp->dp.lt.nr)
475 link_ok = nouveau_dp_link_check_locked(outp);
476 mutex_unlock(&outp->dp.hpd_irq_lock);
477 }
478
479 return link_ok;
480 }
481
482 void
nouveau_dp_irq(struct work_struct * work)483 nouveau_dp_irq(struct work_struct *work)
484 {
485 struct nouveau_connector *nv_connector =
486 container_of(work, typeof(*nv_connector), irq_work);
487 struct drm_connector *connector = &nv_connector->base;
488 struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
489 struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);
490 struct nv50_mstm *mstm;
491 u64 hpd = 0;
492 int ret;
493
494 if (!outp)
495 return;
496
497 mstm = outp->dp.mstm;
498 NV_DEBUG(drm, "service %s\n", connector->name);
499
500 mutex_lock(&outp->dp.hpd_irq_lock);
501
502 if (mstm && mstm->is_mst) {
503 if (!nv50_mstm_service(drm, nv_connector, mstm))
504 hpd |= NVIF_CONN_EVENT_V0_UNPLUG;
505 } else {
506 drm_dp_cec_irq(&nv_connector->aux);
507
508 if (nouveau_dp_has_sink_count(connector, outp)) {
509 ret = drm_dp_read_sink_count(&nv_connector->aux);
510 if (ret != outp->dp.sink_count)
511 hpd |= NVIF_CONN_EVENT_V0_PLUG;
512 if (ret >= 0)
513 outp->dp.sink_count = ret;
514 }
515 }
516
517 mutex_unlock(&outp->dp.hpd_irq_lock);
518
519 nouveau_connector_hpd(nv_connector, NVIF_CONN_EVENT_V0_IRQ | hpd);
520 }
521
522 /* TODO:
523 * - Validate against the DP caps advertised by the GPU (we don't check these
524 * yet)
525 */
526 enum drm_mode_status
nv50_dp_mode_valid(struct nouveau_encoder * outp,const struct drm_display_mode * mode,unsigned * out_clock)527 nv50_dp_mode_valid(struct nouveau_encoder *outp,
528 const struct drm_display_mode *mode,
529 unsigned *out_clock)
530 {
531 const unsigned int min_clock = 25000;
532 unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
533 /* Check with the minmum bpc always, so we can advertise better modes.
534 * In particlar not doing this causes modes to be dropped on HDR
535 * displays as we might check with a bpc of 16 even.
536 */
537 const u8 bpp = 6 * 3;
538
539 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
540 return MODE_NO_INTERLACE;
541
542 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
543 clock *= 2;
544
545 max_rate = outp->dp.link_nr * outp->dp.link_bw;
546 mode_rate = DIV_ROUND_UP(clock * bpp, 8);
547 if (mode_rate > max_rate)
548 return MODE_CLOCK_HIGH;
549
550 ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
551 if (ds_max_dotclock && clock > ds_max_dotclock)
552 return MODE_CLOCK_HIGH;
553
554 if (clock < min_clock)
555 return MODE_CLOCK_LOW;
556
557 if (out_clock)
558 *out_clock = clock;
559
560 return MODE_OK;
561 }
562