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 enum drm_mode_status
 288 cdn_dp_connector_mode_valid(struct drm_connector *connector,
 289                             struct drm_display_mode *mode)
 290 {
 291         struct cdn_dp_device *dp = connector_to_dp(connector);
 292         struct drm_display_info *display_info = &dp->connector.display_info;
 293         u32 requested, actual, rate, sink_max, source_max = 0;
 294         u8 lanes, bpc;
 295
 296         /* If DP is disconnected, every mode is invalid */
 297         if (!dp->connected)
 298                 return MODE_BAD;
 299
 300         switch (display_info->bpc) {
 301         case 10:
 302                 bpc = 10;
 303                 break;
 304         case 6:
 305                 bpc = 6;
 306                 break;
 307         default:
 308                 bpc = 8;
 309                 break;
 310         }
 311
 312         requested = mode->clock * bpc * 3 / 1000;
 313
 314         source_max = dp->lanes;
 315         sink_max = drm_dp_max_lane_count(dp->dpcd);
 316         lanes = min(source_max, sink_max);
 317
 318         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 319         sink_max = drm_dp_max_link_rate(dp->dpcd);
 320         rate = min(source_max, sink_max);
 321
 322         actual = rate * lanes / 100;
 323
 324         /* efficiency is about 0.8 */
 325         actual = actual * 8 / 10;
 326
 327         if (requested > actual) {
 328                 DRM_DEV_DEBUG_KMS(dp->dev,
 329                                   "requested=%d, actual=%d, clock=%d\n",
 330                                   requested, actual, mode->clock);
 331                 return MODE_CLOCK_HIGH;
 332         }
 333
 334         return MODE_OK;
 335 }
 336
 337 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 338         .get_modes = cdn_dp_connector_get_modes,
 339         .mode_valid = cdn_dp_connector_mode_valid,
 340 };
 341
 342 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 343 {
 344         int ret;
 345         const u32 *iram_data, *dram_data;
 346         const struct firmware *fw = dp->fw;
 347         const struct cdn_firmware_header *hdr;
 348
 349         hdr = (struct cdn_firmware_header *)fw->data;
 350         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 351                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 352                 return -EINVAL;
 353         }
 354
 355         iram_data = (const u32 *)(fw->data + hdr->header_size);
 356         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 357
 358         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 359                                    dram_data, hdr->dram_size);
 360         if (ret)
 361                 return ret;
 362
 363         ret = cdn_dp_set_firmware_active(dp, true);
 364         if (ret) {
 365                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 366                 return ret;
 367         }
 368
 369         return cdn_dp_event_config(dp);
 370 }
 371
 372 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 373 {
 374         int ret;
 375
 376         if (!cdn_dp_check_sink_connection(dp))
 377                 return -ENODEV;
 378
 379         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 380                                DP_RECEIVER_CAP_SIZE);
 381         if (ret) {
 382                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 383                 return ret;
 384         }
 385
 386         kfree(dp->edid);
 387         dp->edid = drm_do_get_edid(&dp->connector,
 388                                    cdn_dp_get_edid_block, dp);
 389         return 0;
 390 }
 391
 392 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 393 {
 394         union extcon_property_value property;
 395         int ret;
 396
 397         if (!port->phy_enabled) {
 398                 ret = phy_power_on(port->phy);
 399                 if (ret) {
 400                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 401                                       ret);
 402                         goto err_phy;
 403                 }
 404                 port->phy_enabled = true;
 405         }
 406
 407         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 408                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 409         if (ret) {
 410                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 411                 goto err_power_on;
 412         }
 413
 414         ret = cdn_dp_get_hpd_status(dp);
 415         if (ret <= 0) {
 416                 if (!ret)
 417                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 418                 goto err_power_on;
 419         }
 420
 421         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 422                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 423         if (ret) {
 424                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 425                 goto err_power_on;
 426         }
 427
 428         port->lanes = cdn_dp_get_port_lanes(port);
 429         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 430         if (ret) {
 431                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 432                               ret);
 433                 goto err_power_on;
 434         }
 435
 436         dp->active_port = port->id;
 437         return 0;
 438
 439 err_power_on:
 440         if (phy_power_off(port->phy))
 441                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 442         else
 443                 port->phy_enabled = false;
 444
 445 err_phy:
 446         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 447                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 448         return ret;
 449 }
 450
 451 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 452                               struct cdn_dp_port *port)
 453 {
 454         int ret;
 455
 456         if (port->phy_enabled) {
 457                 ret = phy_power_off(port->phy);
 458                 if (ret) {
 459                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 460                         return ret;
 461                 }
 462         }
 463
 464         port->phy_enabled = false;
 465         port->lanes = 0;
 466         dp->active_port = -1;
 467         return 0;
 468 }
 469
 470 static int cdn_dp_disable(struct cdn_dp_device *dp)
 471 {
 472         int ret, i;
 473
 474         if (!dp->active)
 475                 return 0;
 476
 477         for (i = 0; i < dp->ports; i++)
 478                 cdn_dp_disable_phy(dp, dp->port[i]);
 479
 480         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 481                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 482         if (ret) {
 483                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 484                               ret);
 485                 return ret;
 486         }
 487
 488         cdn_dp_set_firmware_active(dp, false);
 489         cdn_dp_clk_disable(dp);
 490         dp->active = false;
 491         dp->link.rate = 0;
 492         dp->link.num_lanes = 0;
 493         if (!dp->connected) {
 494                 kfree(dp->edid);
 495                 dp->edid = NULL;
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int cdn_dp_enable(struct cdn_dp_device *dp)
 502 {
 503         int ret, i, lanes;
 504         struct cdn_dp_port *port;
 505
 506         port = cdn_dp_connected_port(dp);
 507         if (!port) {
 508                 DRM_DEV_ERROR(dp->dev,
 509                               "Can't enable without connection\n");
 510                 return -ENODEV;
 511         }
 512
 513         if (dp->active)
 514                 return 0;
 515
 516         ret = cdn_dp_clk_enable(dp);
 517         if (ret)
 518                 return ret;
 519
 520         ret = cdn_dp_firmware_init(dp);
 521         if (ret) {
 522                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 523                 goto err_clk_disable;
 524         }
 525
 526         /* only enable the port that connected with downstream device */
 527         for (i = port->id; i < dp->ports; i++) {
 528                 port = dp->port[i];
 529                 lanes = cdn_dp_get_port_lanes(port);
 530                 if (lanes) {
 531                         ret = cdn_dp_enable_phy(dp, port);
 532                         if (ret)
 533                                 continue;
 534
 535                         ret = cdn_dp_get_sink_capability(dp);
 536                         if (ret) {
 537                                 cdn_dp_disable_phy(dp, port);
 538                         } else {
 539                                 dp->active = true;
 540                                 dp->lanes = port->lanes;
 541                                 return 0;
 542                         }
 543                 }
 544         }
 545
 546 err_clk_disable:
 547         cdn_dp_clk_disable(dp);
 548         return ret;
 549 }
 550
 551 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 552                                     struct drm_display_mode *mode,
 553                                     struct drm_display_mode *adjusted)
 554 {
 555         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 556         struct drm_display_info *display_info = &dp->connector.display_info;
 557         struct video_info *video = &dp->video_info;
 558
 559         switch (display_info->bpc) {
 560         case 10:
 561                 video->color_depth = 10;
 562                 break;
 563         case 6:
 564                 video->color_depth = 6;
 565                 break;
 566         default:
 567                 video->color_depth = 8;
 568                 break;
 569         }
 570
 571         video->color_fmt = PXL_RGB;
 572         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 573         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 574
 575         memcpy(&dp->mode, adjusted, sizeof(*mode));
 576 }
 577
 578 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 579 {
 580         u8 link_status[DP_LINK_STATUS_SIZE];
 581         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 582         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 583
 584         if (!port || !dp->link.rate || !dp->link.num_lanes)
 585                 return false;
 586
 587         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 588                              DP_LINK_STATUS_SIZE)) {
 589                 DRM_ERROR("Failed to get link status\n");
 590                 return false;
 591         }
 592
 593         /* if link training is requested we should perform it always */
 594         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 595 }
 596
 597 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 598 {
 599         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 600         int ret, val;
 601
 602         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 603         if (ret < 0) {
 604                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 605                 return;
 606         }
 607
 608         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 609                           (ret) ? "LIT" : "BIG");
 610         if (ret)
 611                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 612         else
 613                 val = DP_SEL_VOP_LIT << 16;
 614
 615         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 616         if (ret)
 617                 return;
 618
 619         mutex_lock(&dp->lock);
 620
 621         ret = cdn_dp_enable(dp);
 622         if (ret) {
 623                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 624                               ret);
 625                 goto out;
 626         }
 627         if (!cdn_dp_check_link_status(dp)) {
 628                 ret = cdn_dp_train_link(dp);
 629                 if (ret) {
 630                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 631                         goto out;
 632                 }
 633         }
 634
 635         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 636         if (ret) {
 637                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 638                 goto out;
 639         }
 640
 641         ret = cdn_dp_config_video(dp);
 642         if (ret) {
 643                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 644                 goto out;
 645         }
 646
 647         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 648         if (ret) {
 649                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 650                 goto out;
 651         }
 652 out:
 653         mutex_unlock(&dp->lock);
 654 }
 655
 656 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 657 {
 658         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 659         int ret;
 660
 661         mutex_lock(&dp->lock);
 662         if (dp->active) {
 663                 ret = cdn_dp_disable(dp);
 664                 if (ret) {
 665                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 666                                       ret);
 667                 }
 668         }
 669         mutex_unlock(&dp->lock);
 670
 671         /*
 672          * In the following 2 cases, we need to run the event_work to re-enable
 673          * the DP:
 674          * 1. If there is not just one port device is connected, and remove one
 675          *    device from a port, the DP will be disabled here, at this case,
 676          *    run the event_work to re-open DP for the other port.
 677          * 2. If re-training or re-config failed, the DP will be disabled here.
 678          *    run the event_work to re-connect it.
 679          */
 680         if (!dp->connected && cdn_dp_connected_port(dp))
 681                 schedule_work(&dp->event_work);
 682 }
 683
 684 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 685                                        struct drm_crtc_state *crtc_state,
 686                                        struct drm_connector_state *conn_state)
 687 {
 688         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 689
 690         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 691         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 692
 693         return 0;
 694 }
 695
 696 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 697         .mode_set = cdn_dp_encoder_mode_set,
 698         .enable = cdn_dp_encoder_enable,
 699         .disable = cdn_dp_encoder_disable,
 700         .atomic_check = cdn_dp_encoder_atomic_check,
 701 };
 702
 703 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
 704         .destroy = drm_encoder_cleanup,
 705 };
 706
 707 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 708 {
 709         struct device *dev = dp->dev;
 710         struct device_node *np = dev->of_node;
 711         struct platform_device *pdev = to_platform_device(dev);
 712         struct resource *res;
 713
 714         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 715         if (IS_ERR(dp->grf)) {
 716                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 717                 return PTR_ERR(dp->grf);
 718         }
 719
 720         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 721         dp->regs = devm_ioremap_resource(dev, res);
 722         if (IS_ERR(dp->regs)) {
 723                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 724                 return PTR_ERR(dp->regs);
 725         }
 726
 727         dp->core_clk = devm_clk_get(dev, "core-clk");
 728         if (IS_ERR(dp->core_clk)) {
 729                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 730                 return PTR_ERR(dp->core_clk);
 731         }
 732
 733         dp->pclk = devm_clk_get(dev, "pclk");
 734         if (IS_ERR(dp->pclk)) {
 735                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 736                 return PTR_ERR(dp->pclk);
 737         }
 738
 739         dp->spdif_clk = devm_clk_get(dev, "spdif");
 740         if (IS_ERR(dp->spdif_clk)) {
 741                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 742                 return PTR_ERR(dp->spdif_clk);
 743         }
 744
 745         dp->grf_clk = devm_clk_get(dev, "grf");
 746         if (IS_ERR(dp->grf_clk)) {
 747                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 748                 return PTR_ERR(dp->grf_clk);
 749         }
 750
 751         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 752         if (IS_ERR(dp->spdif_rst)) {
 753                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 754                 return PTR_ERR(dp->spdif_rst);
 755         }
 756
 757         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 758         if (IS_ERR(dp->dptx_rst)) {
 759                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 760                 return PTR_ERR(dp->dptx_rst);
 761         }
 762
 763         dp->core_rst = devm_reset_control_get(dev, "core");
 764         if (IS_ERR(dp->core_rst)) {
 765                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 766                 return PTR_ERR(dp->core_rst);
 767         }
 768
 769         dp->apb_rst = devm_reset_control_get(dev, "apb");
 770         if (IS_ERR(dp->apb_rst)) {
 771                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 772                 return PTR_ERR(dp->apb_rst);
 773         }
 774
 775         return 0;
 776 }
 777
 778 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 779                                   struct hdmi_codec_daifmt *daifmt,
 780                                   struct hdmi_codec_params *params)
 781 {
 782         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 783         struct audio_info audio = {
 784                 .sample_width = params->sample_width,
 785                 .sample_rate = params->sample_rate,
 786                 .channels = params->channels,
 787         };
 788         int ret;
 789
 790         mutex_lock(&dp->lock);
 791         if (!dp->active) {
 792                 ret = -ENODEV;
 793                 goto out;
 794         }
 795
 796         switch (daifmt->fmt) {
 797         case HDMI_I2S:
 798                 audio.format = AFMT_I2S;
 799                 break;
 800         case HDMI_SPDIF:
 801                 audio.format = AFMT_SPDIF;
 802                 break;
 803         default:
 804                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 805                 ret = -EINVAL;
 806                 goto out;
 807         }
 808
 809         ret = cdn_dp_audio_config(dp, &audio);
 810         if (!ret)
 811                 dp->audio_info = audio;
 812
 813 out:
 814         mutex_unlock(&dp->lock);
 815         return ret;
 816 }
 817
 818 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 819 {
 820         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 821         int ret;
 822
 823         mutex_lock(&dp->lock);
 824         if (!dp->active)
 825                 goto out;
 826
 827         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 828         if (!ret)
 829                 dp->audio_info.format = AFMT_UNUSED;
 830 out:
 831         mutex_unlock(&dp->lock);
 832 }
 833
 834 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
 835                                      bool enable)
 836 {
 837         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 838         int ret;
 839
 840         mutex_lock(&dp->lock);
 841         if (!dp->active) {
 842                 ret = -ENODEV;
 843                 goto out;
 844         }
 845
 846         ret = cdn_dp_audio_mute(dp, enable);
 847
 848 out:
 849         mutex_unlock(&dp->lock);
 850         return ret;
 851 }
 852
 853 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 854                                 u8 *buf, size_t len)
 855 {
 856         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 857
 858         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 859
 860         return 0;
 861 }
 862
 863 static const struct hdmi_codec_ops audio_codec_ops = {
 864         .hw_params = cdn_dp_audio_hw_params,
 865         .audio_shutdown = cdn_dp_audio_shutdown,
 866         .digital_mute = cdn_dp_audio_digital_mute,
 867         .get_eld = cdn_dp_audio_get_eld,
 868 };
 869
 870 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 871                                    struct device *dev)
 872 {
 873         struct hdmi_codec_pdata codec_data = {
 874                 .i2s = 1,
 875                 .spdif = 1,
 876                 .ops = &audio_codec_ops,
 877                 .max_i2s_channels = 8,
 878         };
 879
 880         dp->audio_pdev = platform_device_register_data(
 881                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 882                          &codec_data, sizeof(codec_data));
 883
 884         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 885 }
 886
 887 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 888 {
 889         int ret;
 890         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 891         unsigned long sleep = 1000;
 892
 893         WARN_ON(!mutex_is_locked(&dp->lock));
 894
 895         if (dp->fw_loaded)
 896                 return 0;
 897
 898         /* Drop the lock before getting the firmware to avoid blocking boot */
 899         mutex_unlock(&dp->lock);
 900
 901         while (time_before(jiffies, timeout)) {
 902                 ret = reject_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 903                 if (ret == -ENOENT) {
 904                         msleep(sleep);
 905                         sleep *= 2;
 906                         continue;
 907                 } else if (ret) {
 908                         DRM_DEV_ERROR(dp->dev,
 909                                       "failed to request firmware: %d\n", ret);
 910                         goto out;
 911                 }
 912
 913                 dp->fw_loaded = true;
 914                 ret = 0;
 915                 goto out;
 916         }
 917
 918         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 919         ret = -ETIMEDOUT;
 920 out:
 921         mutex_lock(&dp->lock);
 922         return ret;
 923 }
 924
 925 static void cdn_dp_pd_event_work(struct work_struct *work)
 926 {
 927         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 928                                                 event_work);
 929         struct drm_connector *connector = &dp->connector;
 930         enum drm_connector_status old_status;
 931
 932         int ret;
 933
 934         mutex_lock(&dp->lock);
 935
 936         if (dp->suspended)
 937                 goto out;
 938
 939         ret = cdn_dp_request_firmware(dp);
 940         if (ret)
 941                 goto out;
 942
 943         dp->connected = true;
 944
 945         /* Not connected, notify userspace to disable the block */
 946         if (!cdn_dp_connected_port(dp)) {
 947                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
 948                 dp->connected = false;
 949
 950         /* Connected but not enabled, enable the block */
 951         } else if (!dp->active) {
 952                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
 953                 ret = cdn_dp_enable(dp);
 954                 if (ret) {
 955                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
 956                         dp->connected = false;
 957                 }
 958
 959         /* Enabled and connected to a dongle without a sink, notify userspace */
 960         } else if (!cdn_dp_check_sink_connection(dp)) {
 961                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
 962                 dp->connected = false;
 963
 964         /* Enabled and connected with a sink, re-train if requested */
 965         } else if (!cdn_dp_check_link_status(dp)) {
 966                 unsigned int rate = dp->link.rate;
 967                 unsigned int lanes = dp->link.num_lanes;
 968                 struct drm_display_mode *mode = &dp->mode;
 969
 970                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
 971                 ret = cdn_dp_train_link(dp);
 972                 if (ret) {
 973                         dp->connected = false;
 974                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
 975                         goto out;
 976                 }
 977
 978                 /* If training result is changed, update the video config */
 979                 if (mode->clock &&
 980                     (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
 981                         ret = cdn_dp_config_video(dp);
 982                         if (ret) {
 983                                 dp->connected = false;
 984                                 DRM_DEV_ERROR(dp->dev,
 985                                               "Failed to config video %d\n",
 986                                               ret);
 987                         }
 988                 }
 989         }
 990
 991 out:
 992         mutex_unlock(&dp->lock);
 993
 994         old_status = connector->status;
 995         connector->status = connector->funcs->detect(connector, false);
 996         if (old_status != connector->status)
 997                 drm_kms_helper_hotplug_event(dp->drm_dev);
 998 }
 999
1000 static int cdn_dp_pd_event(struct notifier_block *nb,
1001                            unsigned long event, void *priv)
1002 {
1003         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1004                                                 event_nb);
1005         struct cdn_dp_device *dp = port->dp;
1006
1007         /*
1008          * It would be nice to be able to just do the work inline right here.
1009          * However, we need to make a bunch of calls that might sleep in order
1010          * to turn on the block/phy, so use a worker instead.
1011          */
1012         schedule_work(&dp->event_work);
1013
1014         return NOTIFY_DONE;
1015 }
1016
1017 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1018 {
1019         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1020         struct drm_encoder *encoder;
1021         struct drm_connector *connector;
1022         struct cdn_dp_port *port;
1023         struct drm_device *drm_dev = data;
1024         int ret, i;
1025
1026         ret = cdn_dp_parse_dt(dp);
1027         if (ret < 0)
1028                 return ret;
1029
1030         dp->drm_dev = drm_dev;
1031         dp->connected = false;
1032         dp->active = false;
1033         dp->active_port = -1;
1034         dp->fw_loaded = false;
1035
1036         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1037
1038         encoder = &dp->encoder;
1039
1040         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1041                                                              dev->of_node);
1042         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1043
1044         ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1045                                DRM_MODE_ENCODER_TMDS, NULL);
1046         if (ret) {
1047                 DRM_ERROR("failed to initialize encoder with drm\n");
1048                 return ret;
1049         }
1050
1051         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1052
1053         connector = &dp->connector;
1054         connector->polled = DRM_CONNECTOR_POLL_HPD;
1055         connector->dpms = DRM_MODE_DPMS_OFF;
1056
1057         ret = drm_connector_init(drm_dev, connector,
1058                                  &cdn_dp_atomic_connector_funcs,
1059                                  DRM_MODE_CONNECTOR_DisplayPort);
1060         if (ret) {
1061                 DRM_ERROR("failed to initialize connector with drm\n");
1062                 goto err_free_encoder;
1063         }
1064
1065         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1066
1067         ret = drm_connector_attach_encoder(connector, encoder);
1068         if (ret) {
1069                 DRM_ERROR("failed to attach connector and encoder\n");
1070                 goto err_free_connector;
1071         }
1072
1073         for (i = 0; i < dp->ports; i++) {
1074                 port = dp->port[i];
1075
1076                 port->event_nb.notifier_call = cdn_dp_pd_event;
1077                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1078                                                     EXTCON_DISP_DP,
1079                                                     &port->event_nb);
1080                 if (ret) {
1081                         DRM_DEV_ERROR(dev,
1082                                       "register EXTCON_DISP_DP notifier err\n");
1083                         goto err_free_connector;
1084                 }
1085         }
1086
1087         pm_runtime_enable(dev);
1088
1089         schedule_work(&dp->event_work);
1090
1091         return 0;
1092
1093 err_free_connector:
1094         drm_connector_cleanup(connector);
1095 err_free_encoder:
1096         drm_encoder_cleanup(encoder);
1097         return ret;
1098 }
1099
1100 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1101 {
1102         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1103         struct drm_encoder *encoder = &dp->encoder;
1104         struct drm_connector *connector = &dp->connector;
1105
1106         cancel_work_sync(&dp->event_work);
1107         cdn_dp_encoder_disable(encoder);
1108         encoder->funcs->destroy(encoder);
1109         connector->funcs->destroy(connector);
1110
1111         pm_runtime_disable(dev);
1112         if (dp->fw_loaded)
1113                 release_firmware(dp->fw);
1114         kfree(dp->edid);
1115         dp->edid = NULL;
1116 }
1117
1118 static const struct component_ops cdn_dp_component_ops = {
1119         .bind = cdn_dp_bind,
1120         .unbind = cdn_dp_unbind,
1121 };
1122
1123 int cdn_dp_suspend(struct device *dev)
1124 {
1125         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1126         int ret = 0;
1127
1128         mutex_lock(&dp->lock);
1129         if (dp->active)
1130                 ret = cdn_dp_disable(dp);
1131         dp->suspended = true;
1132         mutex_unlock(&dp->lock);
1133
1134         return ret;
1135 }
1136
1137 int cdn_dp_resume(struct device *dev)
1138 {
1139         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1140
1141         mutex_lock(&dp->lock);
1142         dp->suspended = false;
1143         if (dp->fw_loaded)
1144                 schedule_work(&dp->event_work);
1145         mutex_unlock(&dp->lock);
1146
1147         return 0;
1148 }
1149
1150 static int cdn_dp_probe(struct platform_device *pdev)
1151 {
1152         struct device *dev = &pdev->dev;
1153         const struct of_device_id *match;
1154         struct cdn_dp_data *dp_data;
1155         struct cdn_dp_port *port;
1156         struct cdn_dp_device *dp;
1157         struct extcon_dev *extcon;
1158         struct phy *phy;
1159         int i;
1160
1161         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1162         if (!dp)
1163                 return -ENOMEM;
1164         dp->dev = dev;
1165
1166         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1167         dp_data = (struct cdn_dp_data *)match->data;
1168
1169         for (i = 0; i < dp_data->max_phy; i++) {
1170                 extcon = extcon_get_edev_by_phandle(dev, i);
1171                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1172
1173                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1174                     PTR_ERR(phy) == -EPROBE_DEFER)
1175                         return -EPROBE_DEFER;
1176
1177                 if (IS_ERR(extcon) || IS_ERR(phy))
1178                         continue;
1179
1180                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1181                 if (!port)
1182                         return -ENOMEM;
1183
1184                 port->extcon = extcon;
1185                 port->phy = phy;
1186                 port->dp = dp;
1187                 port->id = i;
1188                 dp->port[dp->ports++] = port;
1189         }
1190
1191         if (!dp->ports) {
1192                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1193                 return -EINVAL;
1194         }
1195
1196         mutex_init(&dp->lock);
1197         dev_set_drvdata(dev, dp);
1198
1199         cdn_dp_audio_codec_init(dp, dev);
1200
1201         return component_add(dev, &cdn_dp_component_ops);
1202 }
1203
1204 static int cdn_dp_remove(struct platform_device *pdev)
1205 {
1206         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1207
1208         platform_device_unregister(dp->audio_pdev);
1209         cdn_dp_suspend(dp->dev);
1210         component_del(&pdev->dev, &cdn_dp_component_ops);
1211
1212         return 0;
1213 }
1214
1215 static void cdn_dp_shutdown(struct platform_device *pdev)
1216 {
1217         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1218
1219         cdn_dp_suspend(dp->dev);
1220 }
1221
1222 static const struct dev_pm_ops cdn_dp_pm_ops = {
1223         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1224                                 cdn_dp_resume)
1225 };
1226
1227 struct platform_driver cdn_dp_driver = {
1228         .probe = cdn_dp_probe,
1229         .remove = cdn_dp_remove,
1230         .shutdown = cdn_dp_shutdown,
1231         .driver = {
1232                    .name = "cdn-dp",
1233                    .owner = THIS_MODULE,
1234                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1235                    .pm = &cdn_dp_pm_ops,
1236         },
1237 };