1 /*
2 * Copyright 2012-15 Advanced Micro Devices, 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: AMD
23 *
24 */
25
26 #include <linux/version.h>
27 #include <drm/drm_atomic_helper.h>
28 #include <drm/drm_dp_mst_helper.h>
29 #include <drm/drm_dp_helper.h>
30 #include "dm_services.h"
31 #include "amdgpu.h"
32 #include "amdgpu_dm.h"
33 #include "amdgpu_dm_mst_types.h"
34
35 #include "dc.h"
36 #include "dm_helpers.h"
37
38 #include "dc_link_ddc.h"
39
40 #include "i2caux_interface.h"
41 #if defined(CONFIG_DEBUG_FS)
42 #include "amdgpu_dm_debugfs.h"
43 #endif
44
45 #if defined(CONFIG_DRM_AMD_DC_DCN)
46 #include "dc/dcn20/dcn20_resource.h"
47 #endif
48
dm_dp_aux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)49 static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
50 struct drm_dp_aux_msg *msg)
51 {
52 ssize_t result = 0;
53 struct aux_payload payload;
54 enum aux_channel_operation_result operation_result;
55
56 if (WARN_ON(msg->size > 16))
57 return -E2BIG;
58
59 payload.address = msg->address;
60 payload.data = msg->buffer;
61 payload.length = msg->size;
62 payload.reply = &msg->reply;
63 payload.i2c_over_aux = (msg->request & DP_AUX_NATIVE_WRITE) == 0;
64 payload.write = (msg->request & DP_AUX_I2C_READ) == 0;
65 payload.mot = (msg->request & DP_AUX_I2C_MOT) != 0;
66 payload.defer_delay = 0;
67
68 result = dc_link_aux_transfer_raw(TO_DM_AUX(aux)->ddc_service, &payload,
69 &operation_result);
70
71 if (payload.write && result >= 0)
72 result = msg->size;
73
74 if (result < 0)
75 switch (operation_result) {
76 case AUX_CHANNEL_OPERATION_SUCCEEDED:
77 break;
78 case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
79 case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN:
80 result = -EIO;
81 break;
82 case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
83 case AUX_CHANNEL_OPERATION_FAILED_ENGINE_ACQUIRE:
84 result = -EBUSY;
85 break;
86 case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
87 result = -ETIMEDOUT;
88 break;
89 }
90
91 return result;
92 }
93
94 static void
dm_dp_mst_connector_destroy(struct drm_connector * connector)95 dm_dp_mst_connector_destroy(struct drm_connector *connector)
96 {
97 struct amdgpu_dm_connector *aconnector =
98 to_amdgpu_dm_connector(connector);
99
100 if (aconnector->dc_sink) {
101 dc_link_remove_remote_sink(aconnector->dc_link,
102 aconnector->dc_sink);
103 dc_sink_release(aconnector->dc_sink);
104 }
105
106 kfree(aconnector->edid);
107
108 drm_connector_cleanup(connector);
109 drm_dp_mst_put_port_malloc(aconnector->port);
110 kfree(aconnector);
111 }
112
113 static int
amdgpu_dm_mst_connector_late_register(struct drm_connector * connector)114 amdgpu_dm_mst_connector_late_register(struct drm_connector *connector)
115 {
116 struct amdgpu_dm_connector *amdgpu_dm_connector =
117 to_amdgpu_dm_connector(connector);
118 int r;
119
120 r = drm_dp_mst_connector_late_register(connector,
121 amdgpu_dm_connector->port);
122 if (r < 0)
123 return r;
124
125 #if defined(CONFIG_DEBUG_FS)
126 connector_debugfs_init(amdgpu_dm_connector);
127 #endif
128
129 return 0;
130 }
131
132 static void
amdgpu_dm_mst_connector_early_unregister(struct drm_connector * connector)133 amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
134 {
135 struct amdgpu_dm_connector *amdgpu_dm_connector =
136 to_amdgpu_dm_connector(connector);
137 struct drm_dp_mst_port *port = amdgpu_dm_connector->port;
138
139 drm_dp_mst_connector_early_unregister(connector, port);
140 }
141
142 static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
143 .fill_modes = drm_helper_probe_single_connector_modes,
144 .destroy = dm_dp_mst_connector_destroy,
145 .reset = amdgpu_dm_connector_funcs_reset,
146 .atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
147 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
148 .atomic_set_property = amdgpu_dm_connector_atomic_set_property,
149 .atomic_get_property = amdgpu_dm_connector_atomic_get_property,
150 .late_register = amdgpu_dm_mst_connector_late_register,
151 .early_unregister = amdgpu_dm_mst_connector_early_unregister,
152 };
153
154 #if defined(CONFIG_DRM_AMD_DC_DCN)
validate_dsc_caps_on_connector(struct amdgpu_dm_connector * aconnector)155 static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnector)
156 {
157 struct dc_sink *dc_sink = aconnector->dc_sink;
158 struct drm_dp_mst_port *port = aconnector->port;
159 u8 dsc_caps[16] = { 0 };
160
161 aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);
162 #if defined(CONFIG_HP_HOOK_WORKAROUND)
163 /*
164 * drm_dp_mst_dsc_aux_for_port() will return NULL for certain configs
165 * because it only check the dsc/fec caps of the "port variable" and not the dock
166 *
167 * This case will return NULL: DSC capabe MST dock connected to a non fec/dsc capable display
168 *
169 * Workaround: explicitly check the use case above and use the mst dock's aux as dsc_aux
170 *
171 */
172
173 if (!aconnector->dsc_aux && !port->parent->port_parent)
174 aconnector->dsc_aux = &aconnector->mst_port->dm_dp_aux.aux;
175 #endif
176 if (!aconnector->dsc_aux)
177 return false;
178
179 if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DSC_SUPPORT, dsc_caps, 16) < 0)
180 return false;
181
182 if (!dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,
183 dsc_caps, NULL,
184 &dc_sink->dsc_caps.dsc_dec_caps))
185 return false;
186
187 return true;
188 }
189 #endif
190
dm_dp_mst_get_modes(struct drm_connector * connector)191 static int dm_dp_mst_get_modes(struct drm_connector *connector)
192 {
193 struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
194 int ret = 0;
195
196 if (!aconnector)
197 return drm_add_edid_modes(connector, NULL);
198
199 if (!aconnector->edid) {
200 struct edid *edid;
201 edid = drm_dp_mst_get_edid(connector, &aconnector->mst_port->mst_mgr, aconnector->port);
202
203 if (!edid) {
204 drm_connector_update_edid_property(
205 &aconnector->base,
206 NULL);
207 return ret;
208 }
209
210 aconnector->edid = edid;
211 }
212
213 if (aconnector->dc_sink && aconnector->dc_sink->sink_signal == SIGNAL_TYPE_VIRTUAL) {
214 dc_sink_release(aconnector->dc_sink);
215 aconnector->dc_sink = NULL;
216 }
217
218 if (!aconnector->dc_sink) {
219 struct dc_sink *dc_sink;
220 struct dc_sink_init_data init_params = {
221 .link = aconnector->dc_link,
222 .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
223 dc_sink = dc_link_add_remote_sink(
224 aconnector->dc_link,
225 (uint8_t *)aconnector->edid,
226 (aconnector->edid->extensions + 1) * EDID_LENGTH,
227 &init_params);
228
229 dc_sink->priv = aconnector;
230 /* dc_link_add_remote_sink returns a new reference */
231 aconnector->dc_sink = dc_sink;
232
233 if (aconnector->dc_sink) {
234 amdgpu_dm_update_freesync_caps(
235 connector, aconnector->edid);
236
237 #if defined(CONFIG_DRM_AMD_DC_DCN)
238 if (!validate_dsc_caps_on_connector(aconnector))
239 memset(&aconnector->dc_sink->dsc_caps,
240 0, sizeof(aconnector->dc_sink->dsc_caps));
241 #endif
242 }
243 }
244
245 drm_connector_update_edid_property(
246 &aconnector->base, aconnector->edid);
247
248 ret = drm_add_edid_modes(connector, aconnector->edid);
249
250 return ret;
251 }
252
253 static struct drm_encoder *
dm_mst_atomic_best_encoder(struct drm_connector * connector,struct drm_connector_state * connector_state)254 dm_mst_atomic_best_encoder(struct drm_connector *connector,
255 struct drm_connector_state *connector_state)
256 {
257 struct drm_device *dev = connector->dev;
258 struct amdgpu_device *adev = drm_to_adev(dev);
259 struct amdgpu_crtc *acrtc = to_amdgpu_crtc(connector_state->crtc);
260
261 return &adev->dm.mst_encoders[acrtc->crtc_id].base;
262 }
263
264 static int
dm_dp_mst_detect(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)265 dm_dp_mst_detect(struct drm_connector *connector,
266 struct drm_modeset_acquire_ctx *ctx, bool force)
267 {
268 struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
269 struct amdgpu_dm_connector *master = aconnector->mst_port;
270
271 return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
272 aconnector->port);
273 }
274
dm_dp_mst_atomic_check(struct drm_connector * connector,struct drm_atomic_state * state)275 static int dm_dp_mst_atomic_check(struct drm_connector *connector,
276 struct drm_atomic_state *state)
277 {
278 struct drm_connector_state *new_conn_state =
279 drm_atomic_get_new_connector_state(state, connector);
280 struct drm_connector_state *old_conn_state =
281 drm_atomic_get_old_connector_state(state, connector);
282 struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
283 struct drm_crtc_state *new_crtc_state;
284 struct drm_dp_mst_topology_mgr *mst_mgr;
285 struct drm_dp_mst_port *mst_port;
286
287 mst_port = aconnector->port;
288 mst_mgr = &aconnector->mst_port->mst_mgr;
289
290 if (!old_conn_state->crtc)
291 return 0;
292
293 if (new_conn_state->crtc) {
294 new_crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
295 if (!new_crtc_state ||
296 !drm_atomic_crtc_needs_modeset(new_crtc_state) ||
297 new_crtc_state->enable)
298 return 0;
299 }
300
301 return drm_dp_atomic_release_vcpi_slots(state,
302 mst_mgr,
303 mst_port);
304 }
305
306 static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
307 .get_modes = dm_dp_mst_get_modes,
308 .mode_valid = amdgpu_dm_connector_mode_valid,
309 .atomic_best_encoder = dm_mst_atomic_best_encoder,
310 .detect_ctx = dm_dp_mst_detect,
311 .atomic_check = dm_dp_mst_atomic_check,
312 };
313
amdgpu_dm_encoder_destroy(struct drm_encoder * encoder)314 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
315 {
316 drm_encoder_cleanup(encoder);
317 kfree(encoder);
318 }
319
320 static const struct drm_encoder_funcs amdgpu_dm_encoder_funcs = {
321 .destroy = amdgpu_dm_encoder_destroy,
322 };
323
324 void
dm_dp_create_fake_mst_encoders(struct amdgpu_device * adev)325 dm_dp_create_fake_mst_encoders(struct amdgpu_device *adev)
326 {
327 struct drm_device *dev = adev_to_drm(adev);
328 int i;
329
330 for (i = 0; i < adev->dm.display_indexes_num; i++) {
331 struct amdgpu_encoder *amdgpu_encoder = &adev->dm.mst_encoders[i];
332 struct drm_encoder *encoder = &amdgpu_encoder->base;
333
334 encoder->possible_crtcs = amdgpu_dm_get_encoder_crtc_mask(adev);
335
336 drm_encoder_init(
337 dev,
338 &amdgpu_encoder->base,
339 &amdgpu_dm_encoder_funcs,
340 DRM_MODE_ENCODER_DPMST,
341 NULL);
342
343 drm_encoder_helper_add(encoder, &amdgpu_dm_encoder_helper_funcs);
344 }
345 }
346
347 static struct drm_connector *
dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr * mgr,struct drm_dp_mst_port * port,const char * pathprop)348 dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
349 struct drm_dp_mst_port *port,
350 const char *pathprop)
351 {
352 struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
353 struct drm_device *dev = master->base.dev;
354 struct amdgpu_device *adev = drm_to_adev(dev);
355 struct amdgpu_dm_connector *aconnector;
356 struct drm_connector *connector;
357 int i;
358
359 aconnector = kzalloc(sizeof(*aconnector), GFP_KERNEL);
360 if (!aconnector)
361 return NULL;
362
363 connector = &aconnector->base;
364 aconnector->port = port;
365 aconnector->mst_port = master;
366
367 if (drm_connector_init(
368 dev,
369 connector,
370 &dm_dp_mst_connector_funcs,
371 DRM_MODE_CONNECTOR_DisplayPort)) {
372 kfree(aconnector);
373 return NULL;
374 }
375 drm_connector_helper_add(connector, &dm_dp_mst_connector_helper_funcs);
376
377 amdgpu_dm_connector_init_helper(
378 &adev->dm,
379 aconnector,
380 DRM_MODE_CONNECTOR_DisplayPort,
381 master->dc_link,
382 master->connector_id);
383
384 for (i = 0; i < adev->dm.display_indexes_num; i++) {
385 drm_connector_attach_encoder(&aconnector->base,
386 &adev->dm.mst_encoders[i].base);
387 }
388
389 connector->max_bpc_property = master->base.max_bpc_property;
390 if (connector->max_bpc_property)
391 drm_connector_attach_max_bpc_property(connector, 8, 16);
392
393 connector->vrr_capable_property = master->base.vrr_capable_property;
394 if (connector->vrr_capable_property)
395 drm_connector_attach_vrr_capable_property(connector);
396
397 drm_object_attach_property(
398 &connector->base,
399 dev->mode_config.path_property,
400 0);
401 drm_object_attach_property(
402 &connector->base,
403 dev->mode_config.tile_property,
404 0);
405
406 drm_connector_set_path_property(connector, pathprop);
407
408 /*
409 * Initialize connector state before adding the connectror to drm and
410 * framebuffer lists
411 */
412 amdgpu_dm_connector_funcs_reset(connector);
413
414 drm_dp_mst_get_port_malloc(port);
415
416 return connector;
417 }
418
419 static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
420 .add_connector = dm_dp_add_mst_connector,
421 };
422
amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager * dm,struct amdgpu_dm_connector * aconnector,int link_index)423 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
424 struct amdgpu_dm_connector *aconnector,
425 int link_index)
426 {
427 aconnector->dm_dp_aux.aux.name =
428 kasprintf(GFP_KERNEL, "AMDGPU DM aux hw bus %d",
429 link_index);
430 aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
431 aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
432
433 drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
434 drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
435 &aconnector->base);
436
437 if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
438 return;
439
440 aconnector->mst_mgr.cbs = &dm_mst_cbs;
441 drm_dp_mst_topology_mgr_init(
442 &aconnector->mst_mgr,
443 adev_to_drm(dm->adev),
444 &aconnector->dm_dp_aux.aux,
445 16,
446 4,
447 aconnector->connector_id);
448
449 drm_connector_attach_dp_subconnector_property(&aconnector->base);
450 }
451
dm_mst_get_pbn_divider(struct dc_link * link)452 int dm_mst_get_pbn_divider(struct dc_link *link)
453 {
454 if (!link)
455 return 0;
456
457 return dc_link_bandwidth_kbps(link,
458 dc_link_get_link_cap(link)) / (8 * 1000 * 54);
459 }
460
461 #if defined(CONFIG_DRM_AMD_DC_DCN)
462
463 struct dsc_mst_fairness_params {
464 struct dc_crtc_timing *timing;
465 struct dc_sink *sink;
466 struct dc_dsc_bw_range bw_range;
467 bool compression_possible;
468 struct drm_dp_mst_port *port;
469 enum dsc_clock_force_state clock_force_enable;
470 uint32_t num_slices_h;
471 uint32_t num_slices_v;
472 uint32_t bpp_overwrite;
473 };
474
475 struct dsc_mst_fairness_vars {
476 int pbn;
477 bool dsc_enabled;
478 int bpp_x16;
479 };
480
kbps_to_peak_pbn(int kbps)481 static int kbps_to_peak_pbn(int kbps)
482 {
483 u64 peak_kbps = kbps;
484
485 peak_kbps *= 1006;
486 peak_kbps = div_u64(peak_kbps, 1000);
487 return (int) DIV64_U64_ROUND_UP(peak_kbps * 64, (54 * 8 * 1000));
488 }
489
set_dsc_configs_from_fairness_vars(struct dsc_mst_fairness_params * params,struct dsc_mst_fairness_vars * vars,int count)490 static void set_dsc_configs_from_fairness_vars(struct dsc_mst_fairness_params *params,
491 struct dsc_mst_fairness_vars *vars,
492 int count)
493 {
494 int i;
495
496 for (i = 0; i < count; i++) {
497 memset(¶ms[i].timing->dsc_cfg, 0, sizeof(params[i].timing->dsc_cfg));
498 if (vars[i].dsc_enabled && dc_dsc_compute_config(
499 params[i].sink->ctx->dc->res_pool->dscs[0],
500 ¶ms[i].sink->dsc_caps.dsc_dec_caps,
501 params[i].sink->ctx->dc->debug.dsc_min_slice_height_override,
502 0,
503 params[i].timing,
504 ¶ms[i].timing->dsc_cfg)) {
505 params[i].timing->flags.DSC = 1;
506
507 if (params[i].bpp_overwrite)
508 params[i].timing->dsc_cfg.bits_per_pixel = params[i].bpp_overwrite;
509 else
510 params[i].timing->dsc_cfg.bits_per_pixel = vars[i].bpp_x16;
511
512 if (params[i].num_slices_h)
513 params[i].timing->dsc_cfg.num_slices_h = params[i].num_slices_h;
514
515 if (params[i].num_slices_v)
516 params[i].timing->dsc_cfg.num_slices_v = params[i].num_slices_v;
517 } else {
518 params[i].timing->flags.DSC = 0;
519 }
520 }
521 }
522
bpp_x16_from_pbn(struct dsc_mst_fairness_params param,int pbn)523 static int bpp_x16_from_pbn(struct dsc_mst_fairness_params param, int pbn)
524 {
525 struct dc_dsc_config dsc_config;
526 u64 kbps;
527
528 kbps = div_u64((u64)pbn * 994 * 8 * 54, 64);
529 dc_dsc_compute_config(
530 param.sink->ctx->dc->res_pool->dscs[0],
531 ¶m.sink->dsc_caps.dsc_dec_caps,
532 param.sink->ctx->dc->debug.dsc_min_slice_height_override,
533 (int) kbps, param.timing, &dsc_config);
534
535 return dsc_config.bits_per_pixel;
536 }
537
increase_dsc_bpp(struct drm_atomic_state * state,struct dc_link * dc_link,struct dsc_mst_fairness_params * params,struct dsc_mst_fairness_vars * vars,int count)538 static void increase_dsc_bpp(struct drm_atomic_state *state,
539 struct dc_link *dc_link,
540 struct dsc_mst_fairness_params *params,
541 struct dsc_mst_fairness_vars *vars,
542 int count)
543 {
544 int i;
545 bool bpp_increased[MAX_PIPES];
546 int initial_slack[MAX_PIPES];
547 int min_initial_slack;
548 int next_index;
549 int remaining_to_increase = 0;
550 int pbn_per_timeslot;
551 int link_timeslots_used;
552 int fair_pbn_alloc;
553
554 pbn_per_timeslot = dm_mst_get_pbn_divider(dc_link);
555
556 for (i = 0; i < count; i++) {
557 if (vars[i].dsc_enabled) {
558 initial_slack[i] = kbps_to_peak_pbn(params[i].bw_range.max_kbps) - vars[i].pbn;
559 bpp_increased[i] = false;
560 remaining_to_increase += 1;
561 } else {
562 initial_slack[i] = 0;
563 bpp_increased[i] = true;
564 }
565 }
566
567 while (remaining_to_increase) {
568 next_index = -1;
569 min_initial_slack = -1;
570 for (i = 0; i < count; i++) {
571 if (!bpp_increased[i]) {
572 if (min_initial_slack == -1 || min_initial_slack > initial_slack[i]) {
573 min_initial_slack = initial_slack[i];
574 next_index = i;
575 }
576 }
577 }
578
579 if (next_index == -1)
580 break;
581
582 link_timeslots_used = 0;
583
584 for (i = 0; i < count; i++)
585 link_timeslots_used += DIV_ROUND_UP(vars[i].pbn, pbn_per_timeslot);
586
587 fair_pbn_alloc = (63 - link_timeslots_used) / remaining_to_increase * pbn_per_timeslot;
588
589 if (initial_slack[next_index] > fair_pbn_alloc) {
590 vars[next_index].pbn += fair_pbn_alloc;
591 if (drm_dp_atomic_find_vcpi_slots(state,
592 params[next_index].port->mgr,
593 params[next_index].port,
594 vars[next_index].pbn,
595 pbn_per_timeslot) < 0)
596 return;
597 if (!drm_dp_mst_atomic_check(state)) {
598 vars[next_index].bpp_x16 = bpp_x16_from_pbn(params[next_index], vars[next_index].pbn);
599 } else {
600 vars[next_index].pbn -= fair_pbn_alloc;
601 if (drm_dp_atomic_find_vcpi_slots(state,
602 params[next_index].port->mgr,
603 params[next_index].port,
604 vars[next_index].pbn,
605 pbn_per_timeslot) < 0)
606 return;
607 }
608 } else {
609 vars[next_index].pbn += initial_slack[next_index];
610 if (drm_dp_atomic_find_vcpi_slots(state,
611 params[next_index].port->mgr,
612 params[next_index].port,
613 vars[next_index].pbn,
614 pbn_per_timeslot) < 0)
615 return;
616 if (!drm_dp_mst_atomic_check(state)) {
617 vars[next_index].bpp_x16 = params[next_index].bw_range.max_target_bpp_x16;
618 } else {
619 vars[next_index].pbn -= initial_slack[next_index];
620 if (drm_dp_atomic_find_vcpi_slots(state,
621 params[next_index].port->mgr,
622 params[next_index].port,
623 vars[next_index].pbn,
624 pbn_per_timeslot) < 0)
625 return;
626 }
627 }
628
629 bpp_increased[next_index] = true;
630 remaining_to_increase--;
631 }
632 }
633
try_disable_dsc(struct drm_atomic_state * state,struct dc_link * dc_link,struct dsc_mst_fairness_params * params,struct dsc_mst_fairness_vars * vars,int count)634 static void try_disable_dsc(struct drm_atomic_state *state,
635 struct dc_link *dc_link,
636 struct dsc_mst_fairness_params *params,
637 struct dsc_mst_fairness_vars *vars,
638 int count)
639 {
640 int i;
641 bool tried[MAX_PIPES];
642 int kbps_increase[MAX_PIPES];
643 int max_kbps_increase;
644 int next_index;
645 int remaining_to_try = 0;
646
647 for (i = 0; i < count; i++) {
648 if (vars[i].dsc_enabled
649 && vars[i].bpp_x16 == params[i].bw_range.max_target_bpp_x16
650 && params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
651 kbps_increase[i] = params[i].bw_range.stream_kbps - params[i].bw_range.max_kbps;
652 tried[i] = false;
653 remaining_to_try += 1;
654 } else {
655 kbps_increase[i] = 0;
656 tried[i] = true;
657 }
658 }
659
660 while (remaining_to_try) {
661 next_index = -1;
662 max_kbps_increase = -1;
663 for (i = 0; i < count; i++) {
664 if (!tried[i]) {
665 if (max_kbps_increase == -1 || max_kbps_increase < kbps_increase[i]) {
666 max_kbps_increase = kbps_increase[i];
667 next_index = i;
668 }
669 }
670 }
671
672 if (next_index == -1)
673 break;
674
675 vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps);
676 if (drm_dp_atomic_find_vcpi_slots(state,
677 params[next_index].port->mgr,
678 params[next_index].port,
679 vars[next_index].pbn,
680 dm_mst_get_pbn_divider(dc_link)) < 0)
681 return;
682
683 if (!drm_dp_mst_atomic_check(state)) {
684 vars[next_index].dsc_enabled = false;
685 vars[next_index].bpp_x16 = 0;
686 } else {
687 vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps);
688 if (drm_dp_atomic_find_vcpi_slots(state,
689 params[next_index].port->mgr,
690 params[next_index].port,
691 vars[next_index].pbn,
692 dm_mst_get_pbn_divider(dc_link)) < 0)
693 return;
694 }
695
696 tried[next_index] = true;
697 remaining_to_try--;
698 }
699 }
700
compute_mst_dsc_configs_for_link(struct drm_atomic_state * state,struct dc_state * dc_state,struct dc_link * dc_link)701 static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
702 struct dc_state *dc_state,
703 struct dc_link *dc_link)
704 {
705 int i;
706 struct dc_stream_state *stream;
707 struct dsc_mst_fairness_params params[MAX_PIPES];
708 struct dsc_mst_fairness_vars vars[MAX_PIPES];
709 struct amdgpu_dm_connector *aconnector;
710 int count = 0;
711 bool debugfs_overwrite = false;
712
713 memset(params, 0, sizeof(params));
714
715 /* Set up params */
716 for (i = 0; i < dc_state->stream_count; i++) {
717 struct dc_dsc_policy dsc_policy = {0};
718
719 stream = dc_state->streams[i];
720
721 if (stream->link != dc_link)
722 continue;
723
724 stream->timing.flags.DSC = 0;
725
726 params[count].timing = &stream->timing;
727 params[count].sink = stream->sink;
728 aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
729 params[count].port = aconnector->port;
730 params[count].clock_force_enable = aconnector->dsc_settings.dsc_force_enable;
731 if (params[count].clock_force_enable == DSC_CLK_FORCE_ENABLE)
732 debugfs_overwrite = true;
733 params[count].num_slices_h = aconnector->dsc_settings.dsc_num_slices_h;
734 params[count].num_slices_v = aconnector->dsc_settings.dsc_num_slices_v;
735 params[count].bpp_overwrite = aconnector->dsc_settings.dsc_bits_per_pixel;
736 params[count].compression_possible = stream->sink->dsc_caps.dsc_dec_caps.is_dsc_supported;
737 dc_dsc_get_policy_for_timing(params[count].timing, &dsc_policy);
738 if (!dc_dsc_compute_bandwidth_range(
739 stream->sink->ctx->dc->res_pool->dscs[0],
740 stream->sink->ctx->dc->debug.dsc_min_slice_height_override,
741 dsc_policy.min_target_bpp,
742 dsc_policy.max_target_bpp,
743 &stream->sink->dsc_caps.dsc_dec_caps,
744 &stream->timing, ¶ms[count].bw_range))
745 params[count].bw_range.stream_kbps = dc_bandwidth_in_kbps_from_timing(&stream->timing);
746
747 count++;
748 }
749 /* Try no compression */
750 for (i = 0; i < count; i++) {
751 vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
752 vars[i].dsc_enabled = false;
753 vars[i].bpp_x16 = 0;
754 if (drm_dp_atomic_find_vcpi_slots(state,
755 params[i].port->mgr,
756 params[i].port,
757 vars[i].pbn,
758 dm_mst_get_pbn_divider(dc_link)) < 0)
759 return false;
760 }
761 if (!drm_dp_mst_atomic_check(state) && !debugfs_overwrite) {
762 set_dsc_configs_from_fairness_vars(params, vars, count);
763 return true;
764 }
765
766 /* Try max compression */
767 for (i = 0; i < count; i++) {
768 if (params[i].compression_possible && params[i].clock_force_enable != DSC_CLK_FORCE_DISABLE) {
769 vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.min_kbps);
770 vars[i].dsc_enabled = true;
771 vars[i].bpp_x16 = params[i].bw_range.min_target_bpp_x16;
772 if (drm_dp_atomic_find_vcpi_slots(state,
773 params[i].port->mgr,
774 params[i].port,
775 vars[i].pbn,
776 dm_mst_get_pbn_divider(dc_link)) < 0)
777 return false;
778 } else {
779 vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
780 vars[i].dsc_enabled = false;
781 vars[i].bpp_x16 = 0;
782 if (drm_dp_atomic_find_vcpi_slots(state,
783 params[i].port->mgr,
784 params[i].port,
785 vars[i].pbn,
786 dm_mst_get_pbn_divider(dc_link)) < 0)
787 return false;
788 }
789 }
790 if (drm_dp_mst_atomic_check(state))
791 return false;
792
793 /* Optimize degree of compression */
794 increase_dsc_bpp(state, dc_link, params, vars, count);
795
796 try_disable_dsc(state, dc_link, params, vars, count);
797
798 set_dsc_configs_from_fairness_vars(params, vars, count);
799
800 return true;
801 }
802
compute_mst_dsc_configs_for_state(struct drm_atomic_state * state,struct dc_state * dc_state)803 bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
804 struct dc_state *dc_state)
805 {
806 int i, j;
807 struct dc_stream_state *stream;
808 bool computed_streams[MAX_PIPES];
809 struct amdgpu_dm_connector *aconnector;
810
811 for (i = 0; i < dc_state->stream_count; i++)
812 computed_streams[i] = false;
813
814 for (i = 0; i < dc_state->stream_count; i++) {
815 stream = dc_state->streams[i];
816
817 if (stream->signal != SIGNAL_TYPE_DISPLAY_PORT_MST)
818 continue;
819
820 aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
821
822 if (!aconnector || !aconnector->dc_sink)
823 continue;
824
825 if (!aconnector->dc_sink->dsc_caps.dsc_dec_caps.is_dsc_supported)
826 continue;
827
828 if (computed_streams[i])
829 continue;
830
831 mutex_lock(&aconnector->mst_mgr.lock);
832 if (!compute_mst_dsc_configs_for_link(state, dc_state, stream->link)) {
833 mutex_unlock(&aconnector->mst_mgr.lock);
834 return false;
835 }
836 mutex_unlock(&aconnector->mst_mgr.lock);
837
838 for (j = 0; j < dc_state->stream_count; j++) {
839 if (dc_state->streams[j]->link == stream->link)
840 computed_streams[j] = true;
841 }
842 }
843
844 for (i = 0; i < dc_state->stream_count; i++) {
845 stream = dc_state->streams[i];
846
847 if (stream->timing.flags.DSC == 1)
848 dc_stream_add_dsc_to_resource(stream->ctx->dc, dc_state, stream);
849 }
850
851 return true;
852 }
853
854 #endif
855
