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1/*2 * Copyright 2009 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Ben Skeggs23 */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 34MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");35static int nouveau_mst = 1;36module_param_named(mst, nouveau_mst, int, 0400);37 38static bool39nouveau_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 45static bool46nouveau_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 60static enum drm_connector_status61nouveau_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 (nr) {83 drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,84 DP_PHY_REPEATER_MODE_TRANSPARENT);85 86 if (nr > 0) {87 ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,88 DP_PHY_REPEATER_MODE_NON_TRANSPARENT);89 if (ret != 1) {90 drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,91 DP_PHY_REPEATER_MODE_TRANSPARENT);92 } else {93 outp->dp.lttpr.nr = nr;94 }95 }96 }97 }98 99 ret = drm_dp_read_dpcd_caps(aux, dpcd);100 if (ret < 0)101 goto out;102 103 outp->dp.link_nr = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;104 if (outp->dcb->dpconf.link_nr < outp->dp.link_nr)105 outp->dp.link_nr = outp->dcb->dpconf.link_nr;106 107 if (outp->dp.lttpr.nr) {108 int links = drm_dp_lttpr_max_lane_count(outp->dp.lttpr.caps);109 110 if (links && links < outp->dp.link_nr)111 outp->dp.link_nr = links;112 }113 114 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {115 __le16 rates[DP_MAX_SUPPORTED_RATES];116 117 ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, rates, sizeof(rates));118 if (ret == sizeof(rates)) {119 for (int i = 0; i < ARRAY_SIZE(rates); i++) {120 u32 rate = (le16_to_cpu(rates[i]) * 200) / 10;121 int j;122 123 if (!rate)124 break;125 126 for (j = 0; j < outp->dp.rate_nr; j++) {127 if (rate > outp->dp.rate[j].rate) {128 for (int k = outp->dp.rate_nr; k > j; k--)129 outp->dp.rate[k] = outp->dp.rate[k - 1];130 break;131 }132 }133 134 outp->dp.rate[j].dpcd = i;135 outp->dp.rate[j].rate = rate;136 outp->dp.rate_nr++;137 }138 }139 }140 141 if (!outp->dp.rate_nr) {142 const u32 rates[] = { 810000, 540000, 270000, 162000 };143 u32 max_rate = dpcd[DP_MAX_LINK_RATE] * 27000;144 145 if (outp->dp.lttpr.nr) {146 int rate = drm_dp_lttpr_max_link_rate(outp->dp.lttpr.caps);147 148 if (rate && rate < max_rate)149 max_rate = rate;150 }151 152 max_rate = min_t(int, max_rate, outp->dcb->dpconf.link_bw);153 154 for (int i = 0; i < ARRAY_SIZE(rates); i++) {155 if (rates[i] <= max_rate) {156 outp->dp.rate[outp->dp.rate_nr].dpcd = -1;157 outp->dp.rate[outp->dp.rate_nr].rate = rates[i];158 outp->dp.rate_nr++;159 }160 }161 162 if (WARN_ON(!outp->dp.rate_nr))163 goto out;164 }165 166 ret = nvif_outp_dp_rates(&outp->outp, outp->dp.rate, outp->dp.rate_nr);167 if (ret)168 goto out;169 170 for (int i = 0; i < outp->dp.rate_nr; i++) {171 u32 link_bw = outp->dp.rate[i].rate;172 173 if (link_bw > outp->dp.link_bw)174 outp->dp.link_bw = link_bw;175 }176 177 ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));178 if (ret < 0)179 goto out;180 181 if (nouveau_mst) {182 mstm = outp->dp.mstm;183 if (mstm)184 mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd) == DRM_DP_MST;185 }186 187 if (nouveau_dp_has_sink_count(connector, outp)) {188 ret = drm_dp_read_sink_count(aux);189 if (ret < 0)190 goto out;191 192 outp->dp.sink_count = ret;193 194 /*195 * Dongle connected, but no display. Don't bother reading196 * downstream port info197 */198 if (!outp->dp.sink_count)199 return connector_status_disconnected;200 }201 202 ret = drm_dp_read_downstream_info(aux, dpcd,203 outp->dp.downstream_ports);204 if (ret < 0)205 goto out;206 207 status = connector_status_connected;208out:209 if (status != connector_status_connected) {210 /* Clear any cached info */211 outp->dp.sink_count = 0;212 }213 return status;214}215 216int217nouveau_dp_detect(struct nouveau_connector *nv_connector,218 struct nouveau_encoder *nv_encoder)219{220 struct drm_device *dev = nv_encoder->base.base.dev;221 struct nouveau_drm *drm = nouveau_drm(dev);222 struct drm_connector *connector = &nv_connector->base;223 struct nv50_mstm *mstm = nv_encoder->dp.mstm;224 enum drm_connector_status status;225 u8 *dpcd = nv_encoder->dp.dpcd;226 int ret = NOUVEAU_DP_NONE, hpd;227 228 /* eDP ports don't support hotplugging - so there's no point in probing eDP ports unless we229 * haven't probed them once before.230 */231 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {232 if (connector->status == connector_status_connected)233 return NOUVEAU_DP_SST;234 else if (connector->status == connector_status_disconnected)235 return NOUVEAU_DP_NONE;236 }237 238 // Ensure that the aux bus is enabled for probing239 drm_dp_dpcd_set_powered(&nv_connector->aux, true);240 241 mutex_lock(&nv_encoder->dp.hpd_irq_lock);242 if (mstm) {243 /* If we're not ready to handle MST state changes yet, just244 * report the last status of the connector. We'll reprobe it245 * once we've resumed.246 */247 if (mstm->suspended) {248 if (mstm->is_mst)249 ret = NOUVEAU_DP_MST;250 else if (connector->status ==251 connector_status_connected)252 ret = NOUVEAU_DP_SST;253 254 goto out;255 }256 }257 258 hpd = nvif_outp_detect(&nv_encoder->outp);259 if (hpd == NOT_PRESENT) {260 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);261 goto out;262 }263 nvif_outp_dp_aux_pwr(&nv_encoder->outp, true);264 265 status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);266 if (status == connector_status_disconnected) {267 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);268 goto out;269 }270 271 /* If we're in MST mode, we're done here */272 if (mstm && mstm->can_mst && mstm->is_mst) {273 ret = NOUVEAU_DP_MST;274 goto out;275 }276 277 NV_DEBUG(drm, "sink dpcd version: 0x%02x\n", dpcd[DP_DPCD_REV]);278 for (int i = 0; i < nv_encoder->dp.rate_nr; i++)279 NV_DEBUG(drm, "sink rate %d: %d\n", i, nv_encoder->dp.rate[i].rate);280 281 NV_DEBUG(drm, "encoder: %dx%d\n", nv_encoder->dcb->dpconf.link_nr,282 nv_encoder->dcb->dpconf.link_bw);283 NV_DEBUG(drm, "maximum: %dx%d\n", nv_encoder->dp.link_nr,284 nv_encoder->dp.link_bw);285 286 if (mstm && mstm->can_mst) {287 ret = nv50_mstm_detect(nv_encoder);288 if (ret == 1) {289 ret = NOUVEAU_DP_MST;290 goto out;291 } else if (ret != 0) {292 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);293 goto out;294 }295 }296 ret = NOUVEAU_DP_SST;297 298out:299 if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)300 nv50_mstm_remove(mstm);301 302 /* GSP doesn't like when we try to do aux transactions on a port it considers disconnected,303 * and since we don't really have a usecase for that anyway - just disable the aux bus here304 * if we've decided the connector is disconnected305 */306 if (ret == NOUVEAU_DP_NONE)307 drm_dp_dpcd_set_powered(&nv_connector->aux, false);308 309 mutex_unlock(&nv_encoder->dp.hpd_irq_lock);310 return ret;311}312 313void314nouveau_dp_power_down(struct nouveau_encoder *outp)315{316 struct drm_dp_aux *aux = &outp->conn->aux;317 int ret;318 u8 pwr;319 320 mutex_lock(&outp->dp.hpd_irq_lock);321 322 ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr);323 if (ret == 1) {324 pwr &= ~DP_SET_POWER_MASK;325 pwr |= DP_SET_POWER_D3;326 drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);327 }328 329 outp->dp.lt.nr = 0;330 mutex_unlock(&outp->dp.hpd_irq_lock);331}332 333static bool334nouveau_dp_train_link(struct nouveau_encoder *outp, bool retrain)335{336 struct drm_dp_aux *aux = &outp->conn->aux;337 bool post_lt = false;338 int ret, retries = 0;339 340 if ( (outp->dp.dpcd[DP_MAX_LANE_COUNT] & 0x20) &&341 !(outp->dp.dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED))342 post_lt = true;343 344retry:345 ret = nvif_outp_dp_train(&outp->outp, outp->dp.dpcd,346 outp->dp.lttpr.nr,347 outp->dp.lt.nr,348 outp->dp.lt.bw,349 outp->dp.lt.mst,350 post_lt,351 retrain);352 if (ret)353 return false;354 355 if (post_lt) {356 u8 stat[DP_LINK_STATUS_SIZE];357 u8 prev[2];358 u8 time = 0, adjusts = 0, tmp;359 360 ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);361 if (ret)362 return false;363 364 for (;;) {365 if (!drm_dp_channel_eq_ok(stat, outp->dp.lt.nr)) {366 ret = 1;367 break;368 }369 370 if (!(stat[2] & 0x02))371 break;372 373 msleep(5);374 time += 5;375 376 memcpy(prev, &stat[4], sizeof(prev));377 ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);378 if (ret)379 break;380 381 if (!memcmp(prev, &stat[4], sizeof(prev))) {382 if (time > 200)383 break;384 } else {385 u8 pe[4], vs[4];386 387 if (adjusts++ == 6)388 break;389 390 for (int i = 0; i < outp->dp.lt.nr; i++) {391 pe[i] = drm_dp_get_adjust_request_pre_emphasis(stat, i) >>392 DP_TRAIN_PRE_EMPHASIS_SHIFT;393 vs[i] = drm_dp_get_adjust_request_voltage(stat, i) >>394 DP_TRAIN_VOLTAGE_SWING_SHIFT;395 }396 397 ret = nvif_outp_dp_drive(&outp->outp, outp->dp.lt.nr, pe, vs);398 if (ret)399 break;400 401 time = 0;402 }403 }404 405 if (drm_dp_dpcd_readb(aux, DP_LANE_COUNT_SET, &tmp) == 1) {406 tmp &= ~0x20;407 drm_dp_dpcd_writeb(aux, DP_LANE_COUNT_SET, tmp);408 }409 }410 411 if (ret == 1 && retries++ < 3)412 goto retry;413 414 return ret == 0;415}416 417bool418nouveau_dp_train(struct nouveau_encoder *outp, bool mst, u32 khz, u8 bpc)419{420 struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);421 struct drm_dp_aux *aux = &outp->conn->aux;422 u32 min_rate;423 u8 pwr;424 bool ret = true;425 426 if (mst)427 min_rate = outp->dp.link_nr * outp->dp.rate[0].rate;428 else429 min_rate = DIV_ROUND_UP(khz * bpc * 3, 8);430 431 NV_DEBUG(drm, "%s link training (mst:%d min_rate:%d)\n",432 outp->base.base.name, mst, min_rate);433 434 mutex_lock(&outp->dp.hpd_irq_lock);435 436 if (drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr) == 1) {437 if ((pwr & DP_SET_POWER_MASK) != DP_SET_POWER_D0) {438 pwr &= ~DP_SET_POWER_MASK;439 pwr |= DP_SET_POWER_D0;440 drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);441 }442 }443 444 for (int nr = outp->dp.link_nr; nr; nr >>= 1) {445 for (int rate = 0; rate < outp->dp.rate_nr; rate++) {446 if (outp->dp.rate[rate].rate * nr >= min_rate) {447 outp->dp.lt.nr = nr;448 outp->dp.lt.bw = outp->dp.rate[rate].rate;449 outp->dp.lt.mst = mst;450 if (nouveau_dp_train_link(outp, false))451 goto done;452 }453 }454 }455 456 ret = false;457done:458 mutex_unlock(&outp->dp.hpd_irq_lock);459 return ret;460}461 462static bool463nouveau_dp_link_check_locked(struct nouveau_encoder *outp)464{465 u8 link_status[DP_LINK_STATUS_SIZE];466 467 if (!outp || !outp->dp.lt.nr)468 return true;469 470 if (drm_dp_dpcd_read_phy_link_status(&outp->conn->aux, DP_PHY_DPRX, link_status) < 0)471 return false;472 473 if (drm_dp_channel_eq_ok(link_status, outp->dp.lt.nr))474 return true;475 476 return nouveau_dp_train_link(outp, true);477}478 479bool480nouveau_dp_link_check(struct nouveau_connector *nv_connector)481{482 struct nouveau_encoder *outp = nv_connector->dp_encoder;483 bool link_ok = true;484 485 if (outp) {486 mutex_lock(&outp->dp.hpd_irq_lock);487 if (outp->dp.lt.nr)488 link_ok = nouveau_dp_link_check_locked(outp);489 mutex_unlock(&outp->dp.hpd_irq_lock);490 }491 492 return link_ok;493}494 495void496nouveau_dp_irq(struct work_struct *work)497{498 struct nouveau_connector *nv_connector =499 container_of(work, typeof(*nv_connector), irq_work);500 struct drm_connector *connector = &nv_connector->base;501 struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);502 struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);503 struct nv50_mstm *mstm;504 u64 hpd = 0;505 int ret;506 507 if (!outp)508 return;509 510 mstm = outp->dp.mstm;511 NV_DEBUG(drm, "service %s\n", connector->name);512 513 mutex_lock(&outp->dp.hpd_irq_lock);514 515 if (mstm && mstm->is_mst) {516 if (!nv50_mstm_service(drm, nv_connector, mstm))517 hpd |= NVIF_CONN_EVENT_V0_UNPLUG;518 } else {519 drm_dp_cec_irq(&nv_connector->aux);520 521 if (nouveau_dp_has_sink_count(connector, outp)) {522 ret = drm_dp_read_sink_count(&nv_connector->aux);523 if (ret != outp->dp.sink_count)524 hpd |= NVIF_CONN_EVENT_V0_PLUG;525 if (ret >= 0)526 outp->dp.sink_count = ret;527 }528 }529 530 mutex_unlock(&outp->dp.hpd_irq_lock);531 532 nouveau_connector_hpd(nv_connector, NVIF_CONN_EVENT_V0_IRQ | hpd);533}534 535/* TODO:536 * - Validate against the DP caps advertised by the GPU (we don't check these537 * yet)538 */539enum drm_mode_status540nv50_dp_mode_valid(struct nouveau_encoder *outp,541 const struct drm_display_mode *mode,542 unsigned *out_clock)543{544 const unsigned int min_clock = 25000;545 unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;546 /* Check with the minmum bpc always, so we can advertise better modes.547 * In particlar not doing this causes modes to be dropped on HDR548 * displays as we might check with a bpc of 16 even.549 */550 const u8 bpp = 6 * 3;551 552 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)553 return MODE_NO_INTERLACE;554 555 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)556 clock *= 2;557 558 max_rate = outp->dp.link_nr * outp->dp.link_bw;559 mode_rate = DIV_ROUND_UP(clock * bpp, 8);560 if (mode_rate > max_rate)561 return MODE_CLOCK_HIGH;562 563 ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);564 if (ds_max_dotclock && clock > ds_max_dotclock)565 return MODE_CLOCK_HIGH;566 567 if (clock < min_clock)568 return MODE_CLOCK_LOW;569 570 if (out_clock)571 *out_clock = clock;572 573 return MODE_OK;574}575