1 /* $NetBSD: intel_dp_mst.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $ */
2
3 /*
4 * Copyright © 2008 Intel Corporation
5 * 2014 Red Hat Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
16 * Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * IN THE SOFTWARE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: intel_dp_mst.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $");
30
31 #include <drm/drm_atomic_helper.h>
32 #include <drm/drm_edid.h>
33 #include <drm/drm_probe_helper.h>
34
35 #include "i915_drv.h"
36 #include "intel_atomic.h"
37 #include "intel_audio.h"
38 #include "intel_connector.h"
39 #include "intel_ddi.h"
40 #include "intel_display_types.h"
41 #include "intel_dp.h"
42 #include "intel_dp_mst.h"
43 #include "intel_dpio_phy.h"
44
intel_dp_mst_compute_link_config(struct intel_encoder * encoder,struct intel_crtc_state * crtc_state,struct drm_connector_state * conn_state,struct link_config_limits * limits)45 static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
46 struct intel_crtc_state *crtc_state,
47 struct drm_connector_state *conn_state,
48 struct link_config_limits *limits)
49 {
50 struct drm_atomic_state *state = crtc_state->uapi.state;
51 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
52 struct intel_dp *intel_dp = &intel_mst->primary->dp;
53 struct intel_connector *connector =
54 to_intel_connector(conn_state->connector);
55 const struct drm_display_mode *adjusted_mode =
56 &crtc_state->hw.adjusted_mode;
57 void *port = connector->port;
58 bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
59 DP_DPCD_QUIRK_CONSTANT_N);
60 int bpp, slots = -EINVAL;
61
62 crtc_state->lane_count = limits->max_lane_count;
63 crtc_state->port_clock = limits->max_clock;
64
65 for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
66 crtc_state->pipe_bpp = bpp;
67
68 crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
69 crtc_state->pipe_bpp,
70 false);
71
72 slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
73 port, crtc_state->pbn, 0);
74 if (slots == -EDEADLK)
75 return slots;
76 if (slots >= 0)
77 break;
78 }
79
80 if (slots < 0) {
81 DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
82 return slots;
83 }
84
85 intel_link_compute_m_n(crtc_state->pipe_bpp,
86 crtc_state->lane_count,
87 adjusted_mode->crtc_clock,
88 crtc_state->port_clock,
89 &crtc_state->dp_m_n,
90 constant_n, crtc_state->fec_enable);
91 crtc_state->dp_m_n.tu = slots;
92
93 return 0;
94 }
95
96 /*
97 * Iterate over all connectors and return the smallest transcoder in the MST
98 * stream
99 */
100 static enum transcoder
intel_dp_mst_master_trans_compute(struct intel_atomic_state * state,struct intel_dp * mst_port)101 intel_dp_mst_master_trans_compute(struct intel_atomic_state *state,
102 struct intel_dp *mst_port)
103 {
104 struct drm_i915_private *dev_priv = to_i915(state->base.dev);
105 struct intel_digital_connector_state *conn_state;
106 struct intel_connector *connector;
107 enum pipe ret = I915_MAX_PIPES;
108 int i;
109
110 if (INTEL_GEN(dev_priv) < 12)
111 return INVALID_TRANSCODER;
112
113 for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
114 struct intel_crtc_state *crtc_state;
115 struct intel_crtc *crtc;
116
117 if (connector->mst_port != mst_port || !conn_state->base.crtc)
118 continue;
119
120 crtc = to_intel_crtc(conn_state->base.crtc);
121 crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
122 if (!crtc_state->uapi.active)
123 continue;
124
125 /*
126 * Using crtc->pipe because crtc_state->cpu_transcoder is
127 * computed, so others CRTCs could have non-computed
128 * cpu_transcoder
129 */
130 if (crtc->pipe < ret)
131 ret = crtc->pipe;
132 }
133
134 if (ret == I915_MAX_PIPES)
135 return INVALID_TRANSCODER;
136
137 /* Simple cast works because TGL don't have a eDP transcoder */
138 return (enum transcoder)ret;
139 }
140
intel_dp_mst_compute_config(struct intel_encoder * encoder,struct intel_crtc_state * pipe_config,struct drm_connector_state * conn_state)141 static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
142 struct intel_crtc_state *pipe_config,
143 struct drm_connector_state *conn_state)
144 {
145 struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
146 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
147 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
148 struct intel_dp *intel_dp = &intel_mst->primary->dp;
149 struct intel_connector *connector =
150 to_intel_connector(conn_state->connector);
151 struct intel_digital_connector_state *intel_conn_state =
152 to_intel_digital_connector_state(conn_state);
153 const struct drm_display_mode *adjusted_mode =
154 &pipe_config->hw.adjusted_mode;
155 void *port = connector->port;
156 struct link_config_limits limits;
157 int ret;
158
159 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
160 return -EINVAL;
161
162 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
163 pipe_config->has_pch_encoder = false;
164
165 if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
166 pipe_config->has_audio =
167 drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, port);
168 else
169 pipe_config->has_audio =
170 intel_conn_state->force_audio == HDMI_AUDIO_ON;
171
172 /*
173 * for MST we always configure max link bw - the spec doesn't
174 * seem to suggest we should do otherwise.
175 */
176 limits.min_clock =
177 limits.max_clock = intel_dp_max_link_rate(intel_dp);
178
179 limits.min_lane_count =
180 limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
181
182 limits.min_bpp = intel_dp_min_bpp(pipe_config);
183 /*
184 * FIXME: If all the streams can't fit into the link with
185 * their current pipe_bpp we should reduce pipe_bpp across
186 * the board until things start to fit. Until then we
187 * limit to <= 8bpc since that's what was hardcoded for all
188 * MST streams previously. This hack should be removed once
189 * we have the proper retry logic in place.
190 */
191 limits.max_bpp = min(pipe_config->pipe_bpp, 24);
192
193 intel_dp_adjust_compliance_config(intel_dp, pipe_config, &limits);
194
195 ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
196 conn_state, &limits);
197 if (ret)
198 return ret;
199
200 pipe_config->limited_color_range =
201 intel_dp_limited_color_range(pipe_config, conn_state);
202
203 if (IS_GEN9_LP(dev_priv))
204 pipe_config->lane_lat_optim_mask =
205 bxt_ddi_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
206
207 intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
208
209 pipe_config->mst_master_transcoder = intel_dp_mst_master_trans_compute(state, intel_dp);
210
211 return 0;
212 }
213
214 /*
215 * If one of the connectors in a MST stream needs a modeset, mark all CRTCs
216 * that shares the same MST stream as mode changed,
217 * intel_modeset_pipe_config()+intel_crtc_check_fastset() will take care to do
218 * a fastset when possible.
219 */
220 static int
intel_dp_mst_atomic_master_trans_check(struct intel_connector * connector,struct intel_atomic_state * state)221 intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
222 struct intel_atomic_state *state)
223 {
224 struct drm_i915_private *dev_priv = to_i915(state->base.dev);
225 struct drm_connector_list_iter connector_list_iter;
226 struct intel_connector *connector_iter;
227
228 if (INTEL_GEN(dev_priv) < 12)
229 return 0;
230
231 if (!intel_connector_needs_modeset(state, &connector->base))
232 return 0;
233
234 drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
235 for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
236 struct intel_digital_connector_state *conn_iter_state;
237 struct intel_crtc_state *crtc_state;
238 struct intel_crtc *crtc;
239 int ret;
240
241 if (connector_iter->mst_port != connector->mst_port ||
242 connector_iter == connector)
243 continue;
244
245 conn_iter_state = intel_atomic_get_digital_connector_state(state,
246 connector_iter);
247 if (IS_ERR(conn_iter_state)) {
248 drm_connector_list_iter_end(&connector_list_iter);
249 return PTR_ERR(conn_iter_state);
250 }
251
252 if (!conn_iter_state->base.crtc)
253 continue;
254
255 crtc = to_intel_crtc(conn_iter_state->base.crtc);
256 crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
257 if (IS_ERR(crtc_state)) {
258 drm_connector_list_iter_end(&connector_list_iter);
259 return PTR_ERR(crtc_state);
260 }
261
262 ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
263 if (ret) {
264 drm_connector_list_iter_end(&connector_list_iter);
265 return ret;
266 }
267 crtc_state->uapi.mode_changed = true;
268 }
269 drm_connector_list_iter_end(&connector_list_iter);
270
271 return 0;
272 }
273
274 static int
intel_dp_mst_atomic_check(struct drm_connector * connector,struct drm_atomic_state * _state)275 intel_dp_mst_atomic_check(struct drm_connector *connector,
276 struct drm_atomic_state *_state)
277 {
278 struct intel_atomic_state *state = to_intel_atomic_state(_state);
279 struct drm_connector_state *new_conn_state =
280 drm_atomic_get_new_connector_state(&state->base, connector);
281 struct drm_connector_state *old_conn_state =
282 drm_atomic_get_old_connector_state(&state->base, connector);
283 struct intel_connector *intel_connector =
284 to_intel_connector(connector);
285 struct drm_crtc *new_crtc = new_conn_state->crtc;
286 struct drm_dp_mst_topology_mgr *mgr;
287 int ret;
288
289 ret = intel_digital_connector_atomic_check(connector, &state->base);
290 if (ret)
291 return ret;
292
293 ret = intel_dp_mst_atomic_master_trans_check(intel_connector, state);
294 if (ret)
295 return ret;
296
297 if (!old_conn_state->crtc)
298 return 0;
299
300 /* We only want to free VCPI if this state disables the CRTC on this
301 * connector
302 */
303 if (new_crtc) {
304 struct intel_crtc *intel_crtc = to_intel_crtc(new_crtc);
305 struct intel_crtc_state *crtc_state =
306 intel_atomic_get_new_crtc_state(state, intel_crtc);
307
308 if (!crtc_state ||
309 !drm_atomic_crtc_needs_modeset(&crtc_state->uapi) ||
310 crtc_state->uapi.enable)
311 return 0;
312 }
313
314 mgr = &enc_to_mst(to_intel_encoder(old_conn_state->best_encoder))->primary->dp.mst_mgr;
315 ret = drm_dp_atomic_release_vcpi_slots(&state->base, mgr,
316 intel_connector->port);
317
318 return ret;
319 }
320
intel_mst_disable_dp(struct intel_encoder * encoder,const struct intel_crtc_state * old_crtc_state,const struct drm_connector_state * old_conn_state)321 static void intel_mst_disable_dp(struct intel_encoder *encoder,
322 const struct intel_crtc_state *old_crtc_state,
323 const struct drm_connector_state *old_conn_state)
324 {
325 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
326 struct intel_digital_port *intel_dig_port = intel_mst->primary;
327 struct intel_dp *intel_dp = &intel_dig_port->dp;
328 struct intel_connector *connector =
329 to_intel_connector(old_conn_state->connector);
330 int ret;
331
332 DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
333
334 drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
335
336 ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
337 if (ret) {
338 DRM_DEBUG_KMS("failed to update payload %d\n", ret);
339 }
340 if (old_crtc_state->has_audio)
341 intel_audio_codec_disable(encoder,
342 old_crtc_state, old_conn_state);
343 }
344
intel_mst_post_disable_dp(struct intel_encoder * encoder,const struct intel_crtc_state * old_crtc_state,const struct drm_connector_state * old_conn_state)345 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
346 const struct intel_crtc_state *old_crtc_state,
347 const struct drm_connector_state *old_conn_state)
348 {
349 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
350 struct intel_digital_port *intel_dig_port = intel_mst->primary;
351 struct intel_dp *intel_dp = &intel_dig_port->dp;
352 struct intel_connector *connector =
353 to_intel_connector(old_conn_state->connector);
354 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
355 bool last_mst_stream;
356 u32 val;
357
358 intel_dp->active_mst_links--;
359 last_mst_stream = intel_dp->active_mst_links == 0;
360 WARN_ON(INTEL_GEN(dev_priv) >= 12 && last_mst_stream &&
361 !intel_dp_mst_is_master_trans(old_crtc_state));
362
363 intel_crtc_vblank_off(old_crtc_state);
364
365 intel_disable_pipe(old_crtc_state);
366
367 drm_dp_update_payload_part2(&intel_dp->mst_mgr);
368
369 val = I915_READ(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder));
370 val &= ~TRANS_DDI_DP_VC_PAYLOAD_ALLOC;
371 I915_WRITE(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder), val);
372
373 if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
374 DP_TP_STATUS_ACT_SENT, 1))
375 DRM_ERROR("Timed out waiting for ACT sent when disabling\n");
376 drm_dp_check_act_status(&intel_dp->mst_mgr);
377
378 drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
379
380 intel_ddi_disable_transcoder_func(old_crtc_state);
381
382 if (INTEL_GEN(dev_priv) >= 9)
383 skl_scaler_disable(old_crtc_state);
384 else
385 ilk_pfit_disable(old_crtc_state);
386
387 /*
388 * Power down mst path before disabling the port, otherwise we end
389 * up getting interrupts from the sink upon detecting link loss.
390 */
391 drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
392 false);
393 /*
394 * From TGL spec: "If multi-stream slave transcoder: Configure
395 * Transcoder Clock Select to direct no clock to the transcoder"
396 *
397 * From older GENs spec: "Configure Transcoder Clock Select to direct
398 * no clock to the transcoder"
399 */
400 if (INTEL_GEN(dev_priv) < 12 || !last_mst_stream)
401 intel_ddi_disable_pipe_clock(old_crtc_state);
402
403
404 intel_mst->connector = NULL;
405 if (last_mst_stream)
406 intel_dig_port->base.post_disable(&intel_dig_port->base,
407 old_crtc_state, NULL);
408
409 DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
410 }
411
intel_mst_pre_pll_enable_dp(struct intel_encoder * encoder,const struct intel_crtc_state * pipe_config,const struct drm_connector_state * conn_state)412 static void intel_mst_pre_pll_enable_dp(struct intel_encoder *encoder,
413 const struct intel_crtc_state *pipe_config,
414 const struct drm_connector_state *conn_state)
415 {
416 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
417 struct intel_digital_port *intel_dig_port = intel_mst->primary;
418 struct intel_dp *intel_dp = &intel_dig_port->dp;
419
420 if (intel_dp->active_mst_links == 0)
421 intel_dig_port->base.pre_pll_enable(&intel_dig_port->base,
422 pipe_config, NULL);
423 }
424
intel_mst_pre_enable_dp(struct intel_encoder * encoder,const struct intel_crtc_state * pipe_config,const struct drm_connector_state * conn_state)425 static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
426 const struct intel_crtc_state *pipe_config,
427 const struct drm_connector_state *conn_state)
428 {
429 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
430 struct intel_digital_port *intel_dig_port = intel_mst->primary;
431 struct intel_dp *intel_dp = &intel_dig_port->dp;
432 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
433 struct intel_connector *connector =
434 to_intel_connector(conn_state->connector);
435 int ret;
436 u32 temp;
437 bool first_mst_stream;
438
439 /* MST encoders are bound to a crtc, not to a connector,
440 * force the mapping here for get_hw_state.
441 */
442 connector->encoder = encoder;
443 intel_mst->connector = connector;
444 first_mst_stream = intel_dp->active_mst_links == 0;
445 WARN_ON(INTEL_GEN(dev_priv) >= 12 && first_mst_stream &&
446 !intel_dp_mst_is_master_trans(pipe_config));
447
448 DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
449
450 if (first_mst_stream)
451 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
452
453 drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
454
455 if (first_mst_stream)
456 intel_dig_port->base.pre_enable(&intel_dig_port->base,
457 pipe_config, NULL);
458
459 ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
460 connector->port,
461 pipe_config->pbn,
462 pipe_config->dp_m_n.tu);
463 if (!ret)
464 DRM_ERROR("failed to allocate vcpi\n");
465
466 intel_dp->active_mst_links++;
467 temp = I915_READ(intel_dp->regs.dp_tp_status);
468 I915_WRITE(intel_dp->regs.dp_tp_status, temp);
469
470 ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
471
472 /*
473 * Before Gen 12 this is not done as part of
474 * intel_dig_port->base.pre_enable() and should be done here. For
475 * Gen 12+ the step in which this should be done is different for the
476 * first MST stream, so it's done on the DDI for the first stream and
477 * here for the following ones.
478 */
479 if (INTEL_GEN(dev_priv) < 12 || !first_mst_stream)
480 intel_ddi_enable_pipe_clock(pipe_config);
481
482 intel_ddi_set_dp_msa(pipe_config, conn_state);
483 }
484
intel_mst_enable_dp(struct intel_encoder * encoder,const struct intel_crtc_state * pipe_config,const struct drm_connector_state * conn_state)485 static void intel_mst_enable_dp(struct intel_encoder *encoder,
486 const struct intel_crtc_state *pipe_config,
487 const struct drm_connector_state *conn_state)
488 {
489 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
490 struct intel_digital_port *intel_dig_port = intel_mst->primary;
491 struct intel_dp *intel_dp = &intel_dig_port->dp;
492 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
493
494 DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
495
496 if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
497 DP_TP_STATUS_ACT_SENT, 1))
498 DRM_ERROR("Timed out waiting for ACT sent\n");
499
500 drm_dp_check_act_status(&intel_dp->mst_mgr);
501
502 drm_dp_update_payload_part2(&intel_dp->mst_mgr);
503 if (pipe_config->has_audio)
504 intel_audio_codec_enable(encoder, pipe_config, conn_state);
505 }
506
intel_dp_mst_enc_get_hw_state(struct intel_encoder * encoder,enum pipe * pipe)507 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
508 enum pipe *pipe)
509 {
510 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
511 *pipe = intel_mst->pipe;
512 if (intel_mst->connector)
513 return true;
514 return false;
515 }
516
intel_dp_mst_enc_get_config(struct intel_encoder * encoder,struct intel_crtc_state * pipe_config)517 static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
518 struct intel_crtc_state *pipe_config)
519 {
520 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
521 struct intel_digital_port *intel_dig_port = intel_mst->primary;
522
523 intel_ddi_get_config(&intel_dig_port->base, pipe_config);
524 }
525
intel_dp_mst_get_ddc_modes(struct drm_connector * connector)526 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
527 {
528 struct intel_connector *intel_connector = to_intel_connector(connector);
529 struct intel_dp *intel_dp = intel_connector->mst_port;
530 struct edid *edid;
531 int ret;
532
533 if (drm_connector_is_unregistered(connector))
534 return intel_connector_update_modes(connector, NULL);
535
536 edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
537 ret = intel_connector_update_modes(connector, edid);
538 kfree(edid);
539
540 return ret;
541 }
542
543 static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
544 .fill_modes = drm_helper_probe_single_connector_modes,
545 .atomic_get_property = intel_digital_connector_atomic_get_property,
546 .atomic_set_property = intel_digital_connector_atomic_set_property,
547 .late_register = intel_connector_register,
548 .early_unregister = intel_connector_unregister,
549 .destroy = intel_connector_destroy,
550 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
551 .atomic_duplicate_state = intel_digital_connector_duplicate_state,
552 };
553
intel_dp_mst_get_modes(struct drm_connector * connector)554 static int intel_dp_mst_get_modes(struct drm_connector *connector)
555 {
556 return intel_dp_mst_get_ddc_modes(connector);
557 }
558
559 static enum drm_mode_status
intel_dp_mst_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)560 intel_dp_mst_mode_valid(struct drm_connector *connector,
561 struct drm_display_mode *mode)
562 {
563 struct drm_i915_private *dev_priv = to_i915(connector->dev);
564 struct intel_connector *intel_connector = to_intel_connector(connector);
565 struct intel_dp *intel_dp = intel_connector->mst_port;
566 int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
567 int max_rate, mode_rate, max_lanes, max_link_clock;
568
569 if (drm_connector_is_unregistered(connector))
570 return MODE_ERROR;
571
572 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
573 return MODE_NO_DBLESCAN;
574
575 max_link_clock = intel_dp_max_link_rate(intel_dp);
576 max_lanes = intel_dp_max_lane_count(intel_dp);
577
578 max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
579 mode_rate = intel_dp_link_required(mode->clock, 18);
580
581 /* TODO - validate mode against available PBN for link */
582 if (mode->clock < 10000)
583 return MODE_CLOCK_LOW;
584
585 if (mode->flags & DRM_MODE_FLAG_DBLCLK)
586 return MODE_H_ILLEGAL;
587
588 if (mode_rate > max_rate || mode->clock > max_dotclk)
589 return MODE_CLOCK_HIGH;
590
591 return intel_mode_valid_max_plane_size(dev_priv, mode);
592 }
593
intel_mst_atomic_best_encoder(struct drm_connector * connector,struct drm_connector_state * state)594 static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
595 struct drm_connector_state *state)
596 {
597 struct intel_connector *intel_connector = to_intel_connector(connector);
598 struct intel_dp *intel_dp = intel_connector->mst_port;
599 struct intel_crtc *crtc = to_intel_crtc(state->crtc);
600
601 return &intel_dp->mst_encoders[crtc->pipe]->base.base;
602 }
603
604 static int
intel_dp_mst_detect(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)605 intel_dp_mst_detect(struct drm_connector *connector,
606 struct drm_modeset_acquire_ctx *ctx, bool force)
607 {
608 struct intel_connector *intel_connector = to_intel_connector(connector);
609 struct intel_dp *intel_dp = intel_connector->mst_port;
610
611 if (drm_connector_is_unregistered(connector))
612 return connector_status_disconnected;
613
614 return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
615 intel_connector->port);
616 }
617
618 static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
619 .get_modes = intel_dp_mst_get_modes,
620 .mode_valid = intel_dp_mst_mode_valid,
621 .atomic_best_encoder = intel_mst_atomic_best_encoder,
622 .atomic_check = intel_dp_mst_atomic_check,
623 .detect_ctx = intel_dp_mst_detect,
624 };
625
intel_dp_mst_encoder_destroy(struct drm_encoder * encoder)626 static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
627 {
628 struct intel_dp_mst_encoder *intel_mst = enc_to_mst(to_intel_encoder(encoder));
629
630 drm_encoder_cleanup(encoder);
631 kfree(intel_mst);
632 }
633
634 static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
635 .destroy = intel_dp_mst_encoder_destroy,
636 };
637
intel_dp_mst_get_hw_state(struct intel_connector * connector)638 static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
639 {
640 if (connector->encoder && connector->base.state->crtc) {
641 enum pipe pipe;
642 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
643 return false;
644 return true;
645 }
646 return false;
647 }
648
intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr * mgr,struct drm_dp_mst_port * port,const char * pathprop)649 static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)
650 {
651 struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
652 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
653 struct drm_device *dev = intel_dig_port->base.base.dev;
654 struct drm_i915_private *dev_priv = to_i915(dev);
655 struct intel_connector *intel_connector;
656 struct drm_connector *connector;
657 enum pipe pipe;
658 int ret;
659
660 intel_connector = intel_connector_alloc();
661 if (!intel_connector)
662 return NULL;
663
664 intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
665 intel_connector->mst_port = intel_dp;
666 intel_connector->port = port;
667 drm_dp_mst_get_port_malloc(port);
668
669 connector = &intel_connector->base;
670 ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
671 DRM_MODE_CONNECTOR_DisplayPort);
672 if (ret) {
673 intel_connector_free(intel_connector);
674 return NULL;
675 }
676
677 drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
678
679 for_each_pipe(dev_priv, pipe) {
680 struct drm_encoder *enc =
681 &intel_dp->mst_encoders[pipe]->base.base;
682
683 ret = drm_connector_attach_encoder(&intel_connector->base, enc);
684 if (ret)
685 goto err;
686 }
687
688 drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
689 drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
690
691 ret = drm_connector_set_path_property(connector, pathprop);
692 if (ret)
693 goto err;
694
695 intel_attach_force_audio_property(connector);
696 intel_attach_broadcast_rgb_property(connector);
697
698 /*
699 * Reuse the prop from the SST connector because we're
700 * not allowed to create new props after device registration.
701 */
702 connector->max_bpc_property =
703 intel_dp->attached_connector->base.max_bpc_property;
704 if (connector->max_bpc_property)
705 drm_connector_attach_max_bpc_property(connector, 6, 12);
706
707 return connector;
708
709 err:
710 drm_connector_cleanup(connector);
711 return NULL;
712 }
713
intel_dp_register_mst_connector(struct drm_connector * connector)714 static void intel_dp_register_mst_connector(struct drm_connector *connector)
715 {
716 struct drm_i915_private *dev_priv = to_i915(connector->dev);
717
718 if (dev_priv->fbdev)
719 drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper,
720 connector);
721
722 drm_connector_register(connector);
723 }
724
intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr * mgr,struct drm_connector * connector)725 static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
726 struct drm_connector *connector)
727 {
728 struct drm_i915_private *dev_priv = to_i915(connector->dev);
729
730 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name);
731 drm_connector_unregister(connector);
732
733 if (dev_priv->fbdev)
734 drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper,
735 connector);
736
737 drm_connector_put(connector);
738 }
739
740 static const struct drm_dp_mst_topology_cbs mst_cbs = {
741 .add_connector = intel_dp_add_mst_connector,
742 .register_connector = intel_dp_register_mst_connector,
743 .destroy_connector = intel_dp_destroy_mst_connector,
744 };
745
746 static struct intel_dp_mst_encoder *
intel_dp_create_fake_mst_encoder(struct intel_digital_port * intel_dig_port,enum pipe pipe)747 intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
748 {
749 struct intel_dp_mst_encoder *intel_mst;
750 struct intel_encoder *intel_encoder;
751 struct drm_device *dev = intel_dig_port->base.base.dev;
752
753 intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
754
755 if (!intel_mst)
756 return NULL;
757
758 intel_mst->pipe = pipe;
759 intel_encoder = &intel_mst->base;
760 intel_mst->primary = intel_dig_port;
761
762 drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
763 DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
764
765 intel_encoder->type = INTEL_OUTPUT_DP_MST;
766 intel_encoder->power_domain = intel_dig_port->base.power_domain;
767 intel_encoder->port = intel_dig_port->base.port;
768 intel_encoder->cloneable = 0;
769 /*
770 * This is wrong, but broken userspace uses the intersection
771 * of possible_crtcs of all the encoders of a given connector
772 * to figure out which crtcs can drive said connector. What
773 * should be used instead is the union of possible_crtcs.
774 * To keep such userspace functioning we must misconfigure
775 * this to make sure the intersection is not empty :(
776 */
777 intel_encoder->pipe_mask = ~0;
778
779 intel_encoder->compute_config = intel_dp_mst_compute_config;
780 intel_encoder->disable = intel_mst_disable_dp;
781 intel_encoder->post_disable = intel_mst_post_disable_dp;
782 intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
783 intel_encoder->pre_enable = intel_mst_pre_enable_dp;
784 intel_encoder->enable = intel_mst_enable_dp;
785 intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
786 intel_encoder->get_config = intel_dp_mst_enc_get_config;
787
788 return intel_mst;
789
790 }
791
792 static bool
intel_dp_create_fake_mst_encoders(struct intel_digital_port * intel_dig_port)793 intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
794 {
795 struct intel_dp *intel_dp = &intel_dig_port->dp;
796 struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
797 enum pipe pipe;
798
799 for_each_pipe(dev_priv, pipe)
800 intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(intel_dig_port, pipe);
801 return true;
802 }
803
804 int
intel_dp_mst_encoder_active_links(struct intel_digital_port * intel_dig_port)805 intel_dp_mst_encoder_active_links(struct intel_digital_port *intel_dig_port)
806 {
807 return intel_dig_port->dp.active_mst_links;
808 }
809
810 int
intel_dp_mst_encoder_init(struct intel_digital_port * intel_dig_port,int conn_base_id)811 intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
812 {
813 struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
814 struct intel_dp *intel_dp = &intel_dig_port->dp;
815 enum port port = intel_dig_port->base.port;
816 int ret;
817
818 if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
819 return 0;
820
821 if (INTEL_GEN(i915) < 12 && port == PORT_A)
822 return 0;
823
824 if (INTEL_GEN(i915) < 11 && port == PORT_E)
825 return 0;
826
827 intel_dp->mst_mgr.cbs = &mst_cbs;
828
829 /* create encoders */
830 intel_dp_create_fake_mst_encoders(intel_dig_port);
831 ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
832 &intel_dp->aux, 16, 3, conn_base_id);
833 if (ret)
834 return ret;
835
836 intel_dp->can_mst = true;
837
838 return 0;
839 }
840
841 void
intel_dp_mst_encoder_cleanup(struct intel_digital_port * intel_dig_port)842 intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
843 {
844 struct intel_dp *intel_dp = &intel_dig_port->dp;
845
846 if (!intel_dp->can_mst)
847 return;
848
849 drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
850 /* encoders will get killed by normal cleanup */
851 }
852
intel_dp_mst_is_master_trans(const struct intel_crtc_state * crtc_state)853 bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
854 {
855 return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
856 }
857
intel_dp_mst_is_slave_trans(const struct intel_crtc_state * crtc_state)858 bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
859 {
860 return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
861 crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
862 }
863