drivers/gpu/drm/rockchip/cdn-dp-core.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author: Chris Zhong <zyw@rock-chips.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_dp_helper.h>
  19 #include <drm/drm_edid.h>
  20 #include <drm/drm_of.h>
  21
  22 #include <linux/clk.h>
  23 #include <linux/component.h>
  24 #include <linux/extcon.h>
  25 #include <linux/firmware.h>
  26 #include <linux/regmap.h>
  27 #include <linux/reset.h>
  28 #include <linux/mfd/syscon.h>
  29 #include <linux/phy/phy.h>
  30
  31 #include <sound/hdmi-codec.h>
  32
  33 #include "cdn-dp-core.h"
  34 #include "cdn-dp-reg.h"
  35 #include "rockchip_drm_vop.h"
  36
  37 #define connector_to_dp(c) \
  38                 container_of(c, struct cdn_dp_device, connector)
  39
  40 #define encoder_to_dp(c) \
  41                 container_of(c, struct cdn_dp_device, encoder)
  42
  43 #define GRF_SOC_CON9            0x6224
  44 #define DP_SEL_VOP_LIT          BIT(12)
  45 #define GRF_SOC_CON26           0x6268
  46 #define DPTX_HPD_SEL            (3 << 12)
  47 #define DPTX_HPD_DEL            (2 << 12)
  48 #define DPTX_HPD_SEL_MASK       (3 << 28)
  49
  50 #define CDN_FW_TIMEOUT_MS       (64 * 1000)
  51 #define CDN_DPCD_TIMEOUT_MS     5000
  52 #define CDN_DP_FIRMWARE         "/*(DEBLOBBED)*/"
  53
  54 struct cdn_dp_data {
  55         u8 max_phy;
  56 };
  57
  58 struct cdn_dp_data rk3399_cdn_dp = {
  59         .max_phy = 2,
  60 };
  61
  62 static const struct of_device_id cdn_dp_dt_ids[] = {
  63         { .compatible = "rockchip,rk3399-cdn-dp",
  64                 .data = (void *)&rk3399_cdn_dp },
  65         {}
  66 };
  67
  68 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
  69
  70 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
  71                             unsigned int reg, unsigned int val)
  72 {
  73         int ret;
  74
  75         ret = clk_prepare_enable(dp->grf_clk);
  76         if (ret) {
  77                 DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
  78                 return ret;
  79         }
  80
  81         ret = regmap_write(dp->grf, reg, val);
  82         if (ret) {
  83                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
  84                 clk_disable_unprepare(dp->grf_clk);
  85                 return ret;
  86         }
  87
  88         clk_disable_unprepare(dp->grf_clk);
  89
  90         return 0;
  91 }
  92
  93 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
  94 {
  95         int ret;
  96         unsigned long rate;
  97
  98         ret = clk_prepare_enable(dp->pclk);
  99         if (ret < 0) {
 100                 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
 101                 goto err_pclk;
 102         }
 103
 104         ret = clk_prepare_enable(dp->core_clk);
 105         if (ret < 0) {
 106                 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
 107                 goto err_core_clk;
 108         }
 109
 110         ret = pm_runtime_get_sync(dp->dev);
 111         if (ret < 0) {
 112                 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 113                 goto err_pm_runtime_get;
 114         }
 115
 116         reset_control_assert(dp->core_rst);
 117         reset_control_assert(dp->dptx_rst);
 118         reset_control_assert(dp->apb_rst);
 119         reset_control_deassert(dp->core_rst);
 120         reset_control_deassert(dp->dptx_rst);
 121         reset_control_deassert(dp->apb_rst);
 122
 123         rate = clk_get_rate(dp->core_clk);
 124         if (!rate) {
 125                 DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
 126                 ret = -EINVAL;
 127                 goto err_set_rate;
 128         }
 129
 130         cdn_dp_set_fw_clk(dp, rate);
 131         cdn_dp_clock_reset(dp);
 132
 133         return 0;
 134
 135 err_set_rate:
 136         pm_runtime_put(dp->dev);
 137 err_pm_runtime_get:
 138         clk_disable_unprepare(dp->core_clk);
 139 err_core_clk:
 140         clk_disable_unprepare(dp->pclk);
 141 err_pclk:
 142         return ret;
 143 }
 144
 145 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 146 {
 147         pm_runtime_put_sync(dp->dev);
 148         clk_disable_unprepare(dp->pclk);
 149         clk_disable_unprepare(dp->core_clk);
 150 }
 151
 152 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 153 {
 154         struct extcon_dev *edev = port->extcon;
 155         union extcon_property_value property;
 156         int dptx;
 157         u8 lanes;
 158
 159         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 160         if (dptx > 0) {
 161                 extcon_get_property(edev, EXTCON_DISP_DP,
 162                                     EXTCON_PROP_USB_SS, &property);
 163                 if (property.intval)
 164                         lanes = 2;
 165                 else
 166                         lanes = 4;
 167         } else {
 168                 lanes = 0;
 169         }
 170
 171         return lanes;
 172 }
 173
 174 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 175 {
 176         int ret;
 177         u8 value;
 178
 179         *sink_count = 0;
 180         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 181         if (ret)
 182                 return ret;
 183
 184         *sink_count = DP_GET_SINK_COUNT(value);
 185         return 0;
 186 }
 187
 188 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 189 {
 190         struct cdn_dp_port *port;
 191         int i, lanes;
 192
 193         for (i = 0; i < dp->ports; i++) {
 194                 port = dp->port[i];
 195                 lanes = cdn_dp_get_port_lanes(port);
 196                 if (lanes)
 197                         return port;
 198         }
 199         return NULL;
 200 }
 201
 202 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
 203 {
 204         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 205         struct cdn_dp_port *port;
 206         u8 sink_count = 0;
 207
 208         if (dp->active_port < 0 || dp->active_port >= dp->ports) {
 209                 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
 210                 return false;
 211         }
 212
 213         port = dp->port[dp->active_port];
 214
 215         /*
 216          * Attempt to read sink count, retry in case the sink may not be ready.
 217          *
 218          * Sinks are *supposed* to come up within 1ms from an off state, but
 219          * some docks need more time to power up.
 220          */
 221         while (time_before(jiffies, timeout)) {
 222                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 223                         return false;
 224
 225                 if (!cdn_dp_get_sink_count(dp, &sink_count))
 226                         return sink_count ? true : false;
 227
 228                 usleep_range(5000, 10000);
 229         }
 230
 231         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 232         return false;
 233 }
 234
 235 static enum drm_connector_status
 236 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 237 {
 238         struct cdn_dp_device *dp = connector_to_dp(connector);
 239         enum drm_connector_status status = connector_status_disconnected;
 240
 241         mutex_lock(&dp->lock);
 242         if (dp->connected)
 243                 status = connector_status_connected;
 244         mutex_unlock(&dp->lock);
 245
 246         return status;
 247 }
 248
 249 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 250 {
 251         drm_connector_unregister(connector);
 252         drm_connector_cleanup(connector);
 253 }
 254
 255 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 256         .detect = cdn_dp_connector_detect,
 257         .destroy = cdn_dp_connector_destroy,
 258         .fill_modes = drm_helper_probe_single_connector_modes,
 259         .reset = drm_atomic_helper_connector_reset,
 260         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 261         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 262 };
 263
 264 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 265 {
 266         struct cdn_dp_device *dp = connector_to_dp(connector);
 267         struct edid *edid;
 268         int ret = 0;
 269
 270         mutex_lock(&dp->lock);
 271         edid = dp->edid;
 272         if (edid) {
 273                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 274                                   edid->width_cm, edid->height_cm);
 275
 276                 dp->sink_has_audio = drm_detect_monitor_audio(edid);
 277                 ret = drm_add_edid_modes(connector, edid);
 278                 if (ret)
 279                         drm_connector_update_edid_property(connector,
 280                                                                 edid);
 281         }
 282         mutex_unlock(&dp->lock);
 283
 284         return ret;
 285 }
 286
 287 static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 288                                        struct drm_display_mode *mode)
 289 {
 290         struct cdn_dp_device *dp = connector_to_dp(connector);
 291         struct drm_display_info *display_info = &dp->connector.display_info;
 292         u32 requested, actual, rate, sink_max, source_max = 0;
 293         u8 lanes, bpc;
 294
 295         /* If DP is disconnected, every mode is invalid */
 296         if (!dp->connected)
 297                 return MODE_BAD;
 298
 299         switch (display_info->bpc) {
 300         case 10:
 301                 bpc = 10;
 302                 break;
 303         case 6:
 304                 bpc = 6;
 305                 break;
 306         default:
 307                 bpc = 8;
 308                 break;
 309         }
 310
 311         requested = mode->clock * bpc * 3 / 1000;
 312
 313         source_max = dp->lanes;
 314         sink_max = drm_dp_max_lane_count(dp->dpcd);
 315         lanes = min(source_max, sink_max);
 316
 317         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 318         sink_max = drm_dp_max_link_rate(dp->dpcd);
 319         rate = min(source_max, sink_max);
 320
 321         actual = rate * lanes / 100;
 322
 323         /* efficiency is about 0.8 */
 324         actual = actual * 8 / 10;
 325
 326         if (requested > actual) {
 327                 DRM_DEV_DEBUG_KMS(dp->dev,
 328                                   "requested=%d, actual=%d, clock=%d\n",
 329                                   requested, actual, mode->clock);
 330                 return MODE_CLOCK_HIGH;
 331         }
 332
 333         return MODE_OK;
 334 }
 335
 336 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 337         .get_modes = cdn_dp_connector_get_modes,
 338         .mode_valid = cdn_dp_connector_mode_valid,
 339 };
 340
 341 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 342 {
 343         int ret;
 344         const u32 *iram_data, *dram_data;
 345         const struct firmware *fw = dp->fw;
 346         const struct cdn_firmware_header *hdr;
 347
 348         hdr = (struct cdn_firmware_header *)fw->data;
 349         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 350                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 351                 return -EINVAL;
 352         }
 353
 354         iram_data = (const u32 *)(fw->data + hdr->header_size);
 355         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 356
 357         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 358                                    dram_data, hdr->dram_size);
 359         if (ret)
 360                 return ret;
 361
 362         ret = cdn_dp_set_firmware_active(dp, true);
 363         if (ret) {
 364                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 365                 return ret;
 366         }
 367
 368         return cdn_dp_event_config(dp);
 369 }
 370
 371 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 372 {
 373         int ret;
 374
 375         if (!cdn_dp_check_sink_connection(dp))
 376                 return -ENODEV;
 377
 378         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 379                                DP_RECEIVER_CAP_SIZE);
 380         if (ret) {
 381                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 382                 return ret;
 383         }
 384
 385         kfree(dp->edid);
 386         dp->edid = drm_do_get_edid(&dp->connector,
 387                                    cdn_dp_get_edid_block, dp);
 388         return 0;
 389 }
 390
 391 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 392 {
 393         union extcon_property_value property;
 394         int ret;
 395
 396         if (!port->phy_enabled) {
 397                 ret = phy_power_on(port->phy);
 398                 if (ret) {
 399                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 400                                       ret);
 401                         goto err_phy;
 402                 }
 403                 port->phy_enabled = true;
 404         }
 405
 406         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 407                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 408         if (ret) {
 409                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 410                 goto err_power_on;
 411         }
 412
 413         ret = cdn_dp_get_hpd_status(dp);
 414         if (ret <= 0) {
 415                 if (!ret)
 416                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 417                 goto err_power_on;
 418         }
 419
 420         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 421                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 422         if (ret) {
 423                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 424                 goto err_power_on;
 425         }
 426
 427         port->lanes = cdn_dp_get_port_lanes(port);
 428         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 429         if (ret) {
 430                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 431                               ret);
 432                 goto err_power_on;
 433         }
 434
 435         dp->active_port = port->id;
 436         return 0;
 437
 438 err_power_on:
 439         if (phy_power_off(port->phy))
 440                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 441         else
 442                 port->phy_enabled = false;
 443
 444 err_phy:
 445         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 446                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 447         return ret;
 448 }
 449
 450 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 451                               struct cdn_dp_port *port)
 452 {
 453         int ret;
 454
 455         if (port->phy_enabled) {
 456                 ret = phy_power_off(port->phy);
 457                 if (ret) {
 458                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 459                         return ret;
 460                 }
 461         }
 462
 463         port->phy_enabled = false;
 464         port->lanes = 0;
 465         dp->active_port = -1;
 466         return 0;
 467 }
 468
 469 static int cdn_dp_disable(struct cdn_dp_device *dp)
 470 {
 471         int ret, i;
 472
 473         if (!dp->active)
 474                 return 0;
 475
 476         for (i = 0; i < dp->ports; i++)
 477                 cdn_dp_disable_phy(dp, dp->port[i]);
 478
 479         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 480                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 481         if (ret) {
 482                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 483                               ret);
 484                 return ret;
 485         }
 486
 487         cdn_dp_set_firmware_active(dp, false);
 488         cdn_dp_clk_disable(dp);
 489         dp->active = false;
 490         dp->link.rate = 0;
 491         dp->link.num_lanes = 0;
 492         if (!dp->connected) {
 493                 kfree(dp->edid);
 494                 dp->edid = NULL;
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int cdn_dp_enable(struct cdn_dp_device *dp)
 501 {
 502         int ret, i, lanes;
 503         struct cdn_dp_port *port;
 504
 505         port = cdn_dp_connected_port(dp);
 506         if (!port) {
 507                 DRM_DEV_ERROR(dp->dev,
 508                               "Can't enable without connection\n");
 509                 return -ENODEV;
 510         }
 511
 512         if (dp->active)
 513                 return 0;
 514
 515         ret = cdn_dp_clk_enable(dp);
 516         if (ret)
 517                 return ret;
 518
 519         ret = cdn_dp_firmware_init(dp);
 520         if (ret) {
 521                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 522                 goto err_clk_disable;
 523         }
 524
 525         /* only enable the port that connected with downstream device */
 526         for (i = port->id; i < dp->ports; i++) {
 527                 port = dp->port[i];
 528                 lanes = cdn_dp_get_port_lanes(port);
 529                 if (lanes) {
 530                         ret = cdn_dp_enable_phy(dp, port);
 531                         if (ret)
 532                                 continue;
 533
 534                         ret = cdn_dp_get_sink_capability(dp);
 535                         if (ret) {
 536                                 cdn_dp_disable_phy(dp, port);
 537                         } else {
 538                                 dp->active = true;
 539                                 dp->lanes = port->lanes;
 540                                 return 0;
 541                         }
 542                 }
 543         }
 544
 545 err_clk_disable:
 546         cdn_dp_clk_disable(dp);
 547         return ret;
 548 }
 549
 550 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 551                                     struct drm_display_mode *mode,
 552                                     struct drm_display_mode *adjusted)
 553 {
 554         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 555         struct drm_display_info *display_info = &dp->connector.display_info;
 556         struct video_info *video = &dp->video_info;
 557
 558         switch (display_info->bpc) {
 559         case 10:
 560                 video->color_depth = 10;
 561                 break;
 562         case 6:
 563                 video->color_depth = 6;
 564                 break;
 565         default:
 566                 video->color_depth = 8;
 567                 break;
 568         }
 569
 570         video->color_fmt = PXL_RGB;
 571         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 572         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 573
 574         memcpy(&dp->mode, adjusted, sizeof(*mode));
 575 }
 576
 577 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 578 {
 579         u8 link_status[DP_LINK_STATUS_SIZE];
 580         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 581         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 582
 583         if (!port || !dp->link.rate || !dp->link.num_lanes)
 584                 return false;
 585
 586         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 587                              DP_LINK_STATUS_SIZE)) {
 588                 DRM_ERROR("Failed to get link status\n");
 589                 return false;
 590         }
 591
 592         /* if link training is requested we should perform it always */
 593         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 594 }
 595
 596 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 597 {
 598         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 599         int ret, val;
 600
 601         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 602         if (ret < 0) {
 603                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 604                 return;
 605         }
 606
 607         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 608                           (ret) ? "LIT" : "BIG");
 609         if (ret)
 610                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 611         else
 612                 val = DP_SEL_VOP_LIT << 16;
 613
 614         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 615         if (ret)
 616                 return;
 617
 618         mutex_lock(&dp->lock);
 619
 620         ret = cdn_dp_enable(dp);
 621         if (ret) {
 622                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 623                               ret);
 624                 goto out;
 625         }
 626         if (!cdn_dp_check_link_status(dp)) {
 627                 ret = cdn_dp_train_link(dp);
 628                 if (ret) {
 629                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 630                         goto out;
 631                 }
 632         }
 633
 634         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 635         if (ret) {
 636                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 637                 goto out;
 638         }
 639
 640         ret = cdn_dp_config_video(dp);
 641         if (ret) {
 642                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 643                 goto out;
 644         }
 645
 646         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 647         if (ret) {
 648                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 649                 goto out;
 650         }
 651 out:
 652         mutex_unlock(&dp->lock);
 653 }
 654
 655 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 656 {
 657         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 658         int ret;
 659
 660         mutex_lock(&dp->lock);
 661         if (dp->active) {
 662                 ret = cdn_dp_disable(dp);
 663                 if (ret) {
 664                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 665                                       ret);
 666                 }
 667         }
 668         mutex_unlock(&dp->lock);
 669
 670         /*
 671          * In the following 2 cases, we need to run the event_work to re-enable
 672          * the DP:
 673          * 1. If there is not just one port device is connected, and remove one
 674          *    device from a port, the DP will be disabled here, at this case,
 675          *    run the event_work to re-open DP for the other port.
 676          * 2. If re-training or re-config failed, the DP will be disabled here.
 677          *    run the event_work to re-connect it.
 678          */
 679         if (!dp->connected && cdn_dp_connected_port(dp))
 680                 schedule_work(&dp->event_work);
 681 }
 682
 683 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 684                                        struct drm_crtc_state *crtc_state,
 685                                        struct drm_connector_state *conn_state)
 686 {
 687         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 688
 689         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 690         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 691
 692         return 0;
 693 }
 694
 695 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 696         .mode_set = cdn_dp_encoder_mode_set,
 697         .enable = cdn_dp_encoder_enable,
 698         .disable = cdn_dp_encoder_disable,
 699         .atomic_check = cdn_dp_encoder_atomic_check,
 700 };
 701
 702 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
 703         .destroy = drm_encoder_cleanup,
 704 };
 705
 706 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 707 {
 708         struct device *dev = dp->dev;
 709         struct device_node *np = dev->of_node;
 710         struct platform_device *pdev = to_platform_device(dev);
 711         struct resource *res;
 712
 713         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 714         if (IS_ERR(dp->grf)) {
 715                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 716                 return PTR_ERR(dp->grf);
 717         }
 718
 719         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 720         dp->regs = devm_ioremap_resource(dev, res);
 721         if (IS_ERR(dp->regs)) {
 722                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 723                 return PTR_ERR(dp->regs);
 724         }
 725
 726         dp->core_clk = devm_clk_get(dev, "core-clk");
 727         if (IS_ERR(dp->core_clk)) {
 728                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 729                 return PTR_ERR(dp->core_clk);
 730         }
 731
 732         dp->pclk = devm_clk_get(dev, "pclk");
 733         if (IS_ERR(dp->pclk)) {
 734                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 735                 return PTR_ERR(dp->pclk);
 736         }
 737
 738         dp->spdif_clk = devm_clk_get(dev, "spdif");
 739         if (IS_ERR(dp->spdif_clk)) {
 740                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 741                 return PTR_ERR(dp->spdif_clk);
 742         }
 743
 744         dp->grf_clk = devm_clk_get(dev, "grf");
 745         if (IS_ERR(dp->grf_clk)) {
 746                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 747                 return PTR_ERR(dp->grf_clk);
 748         }
 749
 750         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 751         if (IS_ERR(dp->spdif_rst)) {
 752                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 753                 return PTR_ERR(dp->spdif_rst);
 754         }
 755
 756         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 757         if (IS_ERR(dp->dptx_rst)) {
 758                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 759                 return PTR_ERR(dp->dptx_rst);
 760         }
 761
 762         dp->core_rst = devm_reset_control_get(dev, "core");
 763         if (IS_ERR(dp->core_rst)) {
 764                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 765                 return PTR_ERR(dp->core_rst);
 766         }
 767
 768         dp->apb_rst = devm_reset_control_get(dev, "apb");
 769         if (IS_ERR(dp->apb_rst)) {
 770                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 771                 return PTR_ERR(dp->apb_rst);
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 778                                   struct hdmi_codec_daifmt *daifmt,
 779                                   struct hdmi_codec_params *params)
 780 {
 781         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 782         struct audio_info audio = {
 783                 .sample_width = params->sample_width,
 784                 .sample_rate = params->sample_rate,
 785                 .channels = params->channels,
 786         };
 787         int ret;
 788
 789         mutex_lock(&dp->lock);
 790         if (!dp->active) {
 791                 ret = -ENODEV;
 792                 goto out;
 793         }
 794
 795         switch (daifmt->fmt) {
 796         case HDMI_I2S:
 797                 audio.format = AFMT_I2S;
 798                 break;
 799         case HDMI_SPDIF:
 800                 audio.format = AFMT_SPDIF;
 801                 break;
 802         default:
 803                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 804                 ret = -EINVAL;
 805                 goto out;
 806         }
 807
 808         ret = cdn_dp_audio_config(dp, &audio);
 809         if (!ret)
 810                 dp->audio_info = audio;
 811
 812 out:
 813         mutex_unlock(&dp->lock);
 814         return ret;
 815 }
 816
 817 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 818 {
 819         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 820         int ret;
 821
 822         mutex_lock(&dp->lock);
 823         if (!dp->active)
 824                 goto out;
 825
 826         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 827         if (!ret)
 828                 dp->audio_info.format = AFMT_UNUSED;
 829 out:
 830         mutex_unlock(&dp->lock);
 831 }
 832
 833 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
 834                                      bool enable)
 835 {
 836         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 837         int ret;
 838
 839         mutex_lock(&dp->lock);
 840         if (!dp->active) {
 841                 ret = -ENODEV;
 842                 goto out;
 843         }
 844
 845         ret = cdn_dp_audio_mute(dp, enable);
 846
 847 out:
 848         mutex_unlock(&dp->lock);
 849         return ret;
 850 }
 851
 852 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 853                                 u8 *buf, size_t len)
 854 {
 855         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 856
 857         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 858
 859         return 0;
 860 }
 861
 862 static const struct hdmi_codec_ops audio_codec_ops = {
 863         .hw_params = cdn_dp_audio_hw_params,
 864         .audio_shutdown = cdn_dp_audio_shutdown,
 865         .digital_mute = cdn_dp_audio_digital_mute,
 866         .get_eld = cdn_dp_audio_get_eld,
 867 };
 868
 869 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 870                                    struct device *dev)
 871 {
 872         struct hdmi_codec_pdata codec_data = {
 873                 .i2s = 1,
 874                 .spdif = 1,
 875                 .ops = &audio_codec_ops,
 876                 .max_i2s_channels = 8,
 877         };
 878
 879         dp->audio_pdev = platform_device_register_data(
 880                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 881                          &codec_data, sizeof(codec_data));
 882
 883         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 884 }
 885
 886 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 887 {
 888         int ret;
 889         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 890         unsigned long sleep = 1000;
 891
 892         WARN_ON(!mutex_is_locked(&dp->lock));
 893
 894         if (dp->fw_loaded)
 895                 return 0;
 896
 897         /* Drop the lock before getting the firmware to avoid blocking boot */
 898         mutex_unlock(&dp->lock);
 899
 900         while (time_before(jiffies, timeout)) {
 901                 ret = reject_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 902                 if (ret == -ENOENT) {
 903                         msleep(sleep);
 904                         sleep *= 2;
 905                         continue;
 906                 } else if (ret) {
 907                         DRM_DEV_ERROR(dp->dev,
 908                                       "failed to request firmware: %d\n", ret);
 909                         goto out;
 910                 }
 911
 912                 dp->fw_loaded = true;
 913                 ret = 0;
 914                 goto out;
 915         }
 916
 917         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 918         ret = -ETIMEDOUT;
 919 out:
 920         mutex_lock(&dp->lock);
 921         return ret;
 922 }
 923
 924 static void cdn_dp_pd_event_work(struct work_struct *work)
 925 {
 926         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 927                                                 event_work);
 928         struct drm_connector *connector = &dp->connector;
 929         enum drm_connector_status old_status;
 930
 931         int ret;
 932
 933         mutex_lock(&dp->lock);
 934
 935         if (dp->suspended)
 936                 goto out;
 937
 938         ret = cdn_dp_request_firmware(dp);
 939         if (ret)
 940                 goto out;
 941
 942         dp->connected = true;
 943
 944         /* Not connected, notify userspace to disable the block */
 945         if (!cdn_dp_connected_port(dp)) {
 946                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
 947                 dp->connected = false;
 948
 949         /* Connected but not enabled, enable the block */
 950         } else if (!dp->active) {
 951                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
 952                 ret = cdn_dp_enable(dp);
 953                 if (ret) {
 954                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
 955                         dp->connected = false;
 956                 }
 957
 958         /* Enabled and connected to a dongle without a sink, notify userspace */
 959         } else if (!cdn_dp_check_sink_connection(dp)) {
 960                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
 961                 dp->connected = false;
 962
 963         /* Enabled and connected with a sink, re-train if requested */
 964         } else if (!cdn_dp_check_link_status(dp)) {
 965                 unsigned int rate = dp->link.rate;
 966                 unsigned int lanes = dp->link.num_lanes;
 967                 struct drm_display_mode *mode = &dp->mode;
 968
 969                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
 970                 ret = cdn_dp_train_link(dp);
 971                 if (ret) {
 972                         dp->connected = false;
 973                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
 974                         goto out;
 975                 }
 976
 977                 /* If training result is changed, update the video config */
 978                 if (mode->clock &&
 979                     (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
 980                         ret = cdn_dp_config_video(dp);
 981                         if (ret) {
 982                                 dp->connected = false;
 983                                 DRM_DEV_ERROR(dp->dev,
 984                                               "Failed to config video %d\n",
 985                                               ret);
 986                         }
 987                 }
 988         }
 989
 990 out:
 991         mutex_unlock(&dp->lock);
 992
 993         old_status = connector->status;
 994         connector->status = connector->funcs->detect(connector, false);
 995         if (old_status != connector->status)
 996                 drm_kms_helper_hotplug_event(dp->drm_dev);
 997 }
 998
 999 static int cdn_dp_pd_event(struct notifier_block *nb,
1000                            unsigned long event, void *priv)
1001 {
1002         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1003                                                 event_nb);
1004         struct cdn_dp_device *dp = port->dp;
1005
1006         /*
1007          * It would be nice to be able to just do the work inline right here.
1008          * However, we need to make a bunch of calls that might sleep in order
1009          * to turn on the block/phy, so use a worker instead.
1010          */
1011         schedule_work(&dp->event_work);
1012
1013         return NOTIFY_DONE;
1014 }
1015
1016 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1017 {
1018         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1019         struct drm_encoder *encoder;
1020         struct drm_connector *connector;
1021         struct cdn_dp_port *port;
1022         struct drm_device *drm_dev = data;
1023         int ret, i;
1024
1025         ret = cdn_dp_parse_dt(dp);
1026         if (ret < 0)
1027                 return ret;
1028
1029         dp->drm_dev = drm_dev;
1030         dp->connected = false;
1031         dp->active = false;
1032         dp->active_port = -1;
1033         dp->fw_loaded = false;
1034
1035         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1036
1037         encoder = &dp->encoder;
1038
1039         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1040                                                              dev->of_node);
1041         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1042
1043         ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1044                                DRM_MODE_ENCODER_TMDS, NULL);
1045         if (ret) {
1046                 DRM_ERROR("failed to initialize encoder with drm\n");
1047                 return ret;
1048         }
1049
1050         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1051
1052         connector = &dp->connector;
1053         connector->polled = DRM_CONNECTOR_POLL_HPD;
1054         connector->dpms = DRM_MODE_DPMS_OFF;
1055
1056         ret = drm_connector_init(drm_dev, connector,
1057                                  &cdn_dp_atomic_connector_funcs,
1058                                  DRM_MODE_CONNECTOR_DisplayPort);
1059         if (ret) {
1060                 DRM_ERROR("failed to initialize connector with drm\n");
1061                 goto err_free_encoder;
1062         }
1063
1064         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1065
1066         ret = drm_connector_attach_encoder(connector, encoder);
1067         if (ret) {
1068                 DRM_ERROR("failed to attach connector and encoder\n");
1069                 goto err_free_connector;
1070         }
1071
1072         for (i = 0; i < dp->ports; i++) {
1073                 port = dp->port[i];
1074
1075                 port->event_nb.notifier_call = cdn_dp_pd_event;
1076                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1077                                                     EXTCON_DISP_DP,
1078                                                     &port->event_nb);
1079                 if (ret) {
1080                         DRM_DEV_ERROR(dev,
1081                                       "register EXTCON_DISP_DP notifier err\n");
1082                         goto err_free_connector;
1083                 }
1084         }
1085
1086         pm_runtime_enable(dev);
1087
1088         schedule_work(&dp->event_work);
1089
1090         return 0;
1091
1092 err_free_connector:
1093         drm_connector_cleanup(connector);
1094 err_free_encoder:
1095         drm_encoder_cleanup(encoder);
1096         return ret;
1097 }
1098
1099 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1100 {
1101         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1102         struct drm_encoder *encoder = &dp->encoder;
1103         struct drm_connector *connector = &dp->connector;
1104
1105         cancel_work_sync(&dp->event_work);
1106         cdn_dp_encoder_disable(encoder);
1107         encoder->funcs->destroy(encoder);
1108         connector->funcs->destroy(connector);
1109
1110         pm_runtime_disable(dev);
1111         if (dp->fw_loaded)
1112                 release_firmware(dp->fw);
1113         kfree(dp->edid);
1114         dp->edid = NULL;
1115 }
1116
1117 static const struct component_ops cdn_dp_component_ops = {
1118         .bind = cdn_dp_bind,
1119         .unbind = cdn_dp_unbind,
1120 };
1121
1122 int cdn_dp_suspend(struct device *dev)
1123 {
1124         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1125         int ret = 0;
1126
1127         mutex_lock(&dp->lock);
1128         if (dp->active)
1129                 ret = cdn_dp_disable(dp);
1130         dp->suspended = true;
1131         mutex_unlock(&dp->lock);
1132
1133         return ret;
1134 }
1135
1136 int cdn_dp_resume(struct device *dev)
1137 {
1138         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1139
1140         mutex_lock(&dp->lock);
1141         dp->suspended = false;
1142         if (dp->fw_loaded)
1143                 schedule_work(&dp->event_work);
1144         mutex_unlock(&dp->lock);
1145
1146         return 0;
1147 }
1148
1149 static int cdn_dp_probe(struct platform_device *pdev)
1150 {
1151         struct device *dev = &pdev->dev;
1152         const struct of_device_id *match;
1153         struct cdn_dp_data *dp_data;
1154         struct cdn_dp_port *port;
1155         struct cdn_dp_device *dp;
1156         struct extcon_dev *extcon;
1157         struct phy *phy;
1158         int i;
1159
1160         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1161         if (!dp)
1162                 return -ENOMEM;
1163         dp->dev = dev;
1164
1165         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1166         dp_data = (struct cdn_dp_data *)match->data;
1167
1168         for (i = 0; i < dp_data->max_phy; i++) {
1169                 extcon = extcon_get_edev_by_phandle(dev, i);
1170                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1171
1172                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1173                     PTR_ERR(phy) == -EPROBE_DEFER)
1174                         return -EPROBE_DEFER;
1175
1176                 if (IS_ERR(extcon) || IS_ERR(phy))
1177                         continue;
1178
1179                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1180                 if (!port)
1181                         return -ENOMEM;
1182
1183                 port->extcon = extcon;
1184                 port->phy = phy;
1185                 port->dp = dp;
1186                 port->id = i;
1187                 dp->port[dp->ports++] = port;
1188         }
1189
1190         if (!dp->ports) {
1191                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1192                 return -EINVAL;
1193         }
1194
1195         mutex_init(&dp->lock);
1196         dev_set_drvdata(dev, dp);
1197
1198         cdn_dp_audio_codec_init(dp, dev);
1199
1200         return component_add(dev, &cdn_dp_component_ops);
1201 }
1202
1203 static int cdn_dp_remove(struct platform_device *pdev)
1204 {
1205         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1206
1207         platform_device_unregister(dp->audio_pdev);
1208         cdn_dp_suspend(dp->dev);
1209         component_del(&pdev->dev, &cdn_dp_component_ops);
1210
1211         return 0;
1212 }
1213
1214 static void cdn_dp_shutdown(struct platform_device *pdev)
1215 {
1216         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1217
1218         cdn_dp_suspend(dp->dev);
1219 }
1220
1221 static const struct dev_pm_ops cdn_dp_pm_ops = {
1222         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1223                                 cdn_dp_resume)
1224 };
1225
1226 struct platform_driver cdn_dp_driver = {
1227         .probe = cdn_dp_probe,
1228         .remove = cdn_dp_remove,
1229         .shutdown = cdn_dp_shutdown,
1230         .driver = {
1231                    .name = "cdn-dp",
1232                    .owner = THIS_MODULE,
1233                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1234                    .pm = &cdn_dp_pm_ops,
1235         },
1236 };