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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Rockchip Electronics Co., Ltd.
   4  * Author: Chris Zhong <[email protected]>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/component.h>
   9 #include <linux/extcon.h>
  10 #include <linux/firmware.h>
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/phy/phy.h>
  13 #include <linux/regmap.h>
  14 #include <linux/reset.h>
  15
  16 #include <sound/hdmi-codec.h>
  17
  18 #include <drm/display/drm_dp_helper.h>
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_edid.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_probe_helper.h>
  23 #include <drm/drm_simple_kms_helper.h>
  24
  25 #include "cdn-dp-core.h"
  26 #include "cdn-dp-reg.h"
  27
  28 static inline struct cdn_dp_device *connector_to_dp(struct drm_connector *connector)
  29 {
  30         return container_of(connector, struct cdn_dp_device, connector);
  31 }
  32
  33 static inline struct cdn_dp_device *encoder_to_dp(struct drm_encoder *encoder)
  34 {
  35         struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);
  36
  37         return container_of(rkencoder, struct cdn_dp_device, encoder);
  38 }
  39
  40 #define GRF_SOC_CON9            0x6224
  41 #define DP_SEL_VOP_LIT          BIT(12)
  42 #define GRF_SOC_CON26           0x6268
  43 #define DPTX_HPD_SEL            (3 << 12)
  44 #define DPTX_HPD_DEL            (2 << 12)
  45 #define DPTX_HPD_SEL_MASK       (3 << 28)
  46
  47 #define CDN_FW_TIMEOUT_MS       (64 * 1000)
  48 #define CDN_DPCD_TIMEOUT_MS     5000
  49 #define CDN_DP_FIRMWARE         "rockchip/dptx.bin"
  50 MODULE_FIRMWARE(CDN_DP_FIRMWARE);
  51
  52 struct cdn_dp_data {
  53         u8 max_phy;
  54 };
  55
  56 static struct cdn_dp_data rk3399_cdn_dp = {
  57         .max_phy = 2,
  58 };
  59
  60 static const struct of_device_id cdn_dp_dt_ids[] = {
  61         { .compatible = "rockchip,rk3399-cdn-dp",
  62                 .data = (void *)&rk3399_cdn_dp },
  63         {}
  64 };
  65
  66 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
  67
  68 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
  69                             unsigned int reg, unsigned int val)
  70 {
  71         int ret;
  72
  73         ret = clk_prepare_enable(dp->grf_clk);
  74         if (ret) {
  75                 DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
  76                 return ret;
  77         }
  78
  79         ret = regmap_write(dp->grf, reg, val);
  80         if (ret) {
  81                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
  82                 clk_disable_unprepare(dp->grf_clk);
  83                 return ret;
  84         }
  85
  86         clk_disable_unprepare(dp->grf_clk);
  87
  88         return 0;
  89 }
  90
  91 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
  92 {
  93         int ret;
  94         unsigned long rate;
  95
  96         ret = clk_prepare_enable(dp->pclk);
  97         if (ret < 0) {
  98                 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
  99                 goto err_pclk;
 100         }
 101
 102         ret = clk_prepare_enable(dp->core_clk);
 103         if (ret < 0) {
 104                 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
 105                 goto err_core_clk;
 106         }
 107
 108         ret = pm_runtime_get_sync(dp->dev);
 109         if (ret < 0) {
 110                 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 111                 goto err_pm_runtime_get;
 112         }
 113
 114         reset_control_assert(dp->core_rst);
 115         reset_control_assert(dp->dptx_rst);
 116         reset_control_assert(dp->apb_rst);
 117         reset_control_deassert(dp->core_rst);
 118         reset_control_deassert(dp->dptx_rst);
 119         reset_control_deassert(dp->apb_rst);
 120
 121         rate = clk_get_rate(dp->core_clk);
 122         if (!rate) {
 123                 DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
 124                 ret = -EINVAL;
 125                 goto err_set_rate;
 126         }
 127
 128         cdn_dp_set_fw_clk(dp, rate);
 129         cdn_dp_clock_reset(dp);
 130
 131         return 0;
 132
 133 err_set_rate:
 134         pm_runtime_put(dp->dev);
 135 err_pm_runtime_get:
 136         clk_disable_unprepare(dp->core_clk);
 137 err_core_clk:
 138         clk_disable_unprepare(dp->pclk);
 139 err_pclk:
 140         return ret;
 141 }
 142
 143 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 144 {
 145         pm_runtime_put_sync(dp->dev);
 146         clk_disable_unprepare(dp->pclk);
 147         clk_disable_unprepare(dp->core_clk);
 148 }
 149
 150 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 151 {
 152         struct extcon_dev *edev = port->extcon;
 153         union extcon_property_value property;
 154         int dptx;
 155         u8 lanes;
 156
 157         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 158         if (dptx > 0) {
 159                 extcon_get_property(edev, EXTCON_DISP_DP,
 160                                     EXTCON_PROP_USB_SS, &property);
 161                 if (property.intval)
 162                         lanes = 2;
 163                 else
 164                         lanes = 4;
 165         } else {
 166                 lanes = 0;
 167         }
 168
 169         return lanes;
 170 }
 171
 172 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 173 {
 174         int ret;
 175         u8 value;
 176
 177         *sink_count = 0;
 178         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 179         if (ret)
 180                 return ret;
 181
 182         *sink_count = DP_GET_SINK_COUNT(value);
 183         return 0;
 184 }
 185
 186 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 187 {
 188         struct cdn_dp_port *port;
 189         int i, lanes;
 190
 191         for (i = 0; i < dp->ports; i++) {
 192                 port = dp->port[i];
 193                 lanes = cdn_dp_get_port_lanes(port);
 194                 if (lanes)
 195                         return port;
 196         }
 197         return NULL;
 198 }
 199
 200 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
 201 {
 202         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 203         struct cdn_dp_port *port;
 204         u8 sink_count = 0;
 205
 206         if (dp->active_port < 0 || dp->active_port >= dp->ports) {
 207                 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
 208                 return false;
 209         }
 210
 211         port = dp->port[dp->active_port];
 212
 213         /*
 214          * Attempt to read sink count, retry in case the sink may not be ready.
 215          *
 216          * Sinks are *supposed* to come up within 1ms from an off state, but
 217          * some docks need more time to power up.
 218          */
 219         while (time_before(jiffies, timeout)) {
 220                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 221                         return false;
 222
 223                 if (!cdn_dp_get_sink_count(dp, &sink_count))
 224                         return sink_count ? true : false;
 225
 226                 usleep_range(5000, 10000);
 227         }
 228
 229         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 230         return false;
 231 }
 232
 233 static enum drm_connector_status
 234 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 235 {
 236         struct cdn_dp_device *dp = connector_to_dp(connector);
 237         enum drm_connector_status status = connector_status_disconnected;
 238
 239         mutex_lock(&dp->lock);
 240         if (dp->connected)
 241                 status = connector_status_connected;
 242         mutex_unlock(&dp->lock);
 243
 244         return status;
 245 }
 246
 247 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 248 {
 249         drm_connector_unregister(connector);
 250         drm_connector_cleanup(connector);
 251 }
 252
 253 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 254         .detect = cdn_dp_connector_detect,
 255         .destroy = cdn_dp_connector_destroy,
 256         .fill_modes = drm_helper_probe_single_connector_modes,
 257         .reset = drm_atomic_helper_connector_reset,
 258         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 259         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 260 };
 261
 262 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 263 {
 264         struct cdn_dp_device *dp = connector_to_dp(connector);
 265         int ret = 0;
 266
 267         mutex_lock(&dp->lock);
 268
 269         ret = drm_edid_connector_add_modes(connector);
 270
 271         mutex_unlock(&dp->lock);
 272
 273         return ret;
 274 }
 275
 276 static enum drm_mode_status
 277 cdn_dp_connector_mode_valid(struct drm_connector *connector,
 278                             struct drm_display_mode *mode)
 279 {
 280         struct cdn_dp_device *dp = connector_to_dp(connector);
 281         struct drm_display_info *display_info = &dp->connector.display_info;
 282         u32 requested, actual, rate, sink_max, source_max = 0;
 283         u8 lanes, bpc;
 284
 285         /* If DP is disconnected, every mode is invalid */
 286         if (!dp->connected)
 287                 return MODE_BAD;
 288
 289         switch (display_info->bpc) {
 290         case 10:
 291                 bpc = 10;
 292                 break;
 293         case 6:
 294                 bpc = 6;
 295                 break;
 296         default:
 297                 bpc = 8;
 298                 break;
 299         }
 300
 301         requested = mode->clock * bpc * 3 / 1000;
 302
 303         source_max = dp->lanes;
 304         sink_max = drm_dp_max_lane_count(dp->dpcd);
 305         lanes = min(source_max, sink_max);
 306
 307         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 308         sink_max = drm_dp_max_link_rate(dp->dpcd);
 309         rate = min(source_max, sink_max);
 310
 311         actual = rate * lanes / 100;
 312
 313         /* efficiency is about 0.8 */
 314         actual = actual * 8 / 10;
 315
 316         if (requested > actual) {
 317                 DRM_DEV_DEBUG_KMS(dp->dev,
 318                                   "requested=%d, actual=%d, clock=%d\n",
 319                                   requested, actual, mode->clock);
 320                 return MODE_CLOCK_HIGH;
 321         }
 322
 323         return MODE_OK;
 324 }
 325
 326 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 327         .get_modes = cdn_dp_connector_get_modes,
 328         .mode_valid = cdn_dp_connector_mode_valid,
 329 };
 330
 331 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 332 {
 333         int ret;
 334         const u32 *iram_data, *dram_data;
 335         const struct firmware *fw = dp->fw;
 336         const struct cdn_firmware_header *hdr;
 337
 338         hdr = (struct cdn_firmware_header *)fw->data;
 339         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 340                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 341                 return -EINVAL;
 342         }
 343
 344         iram_data = (const u32 *)(fw->data + hdr->header_size);
 345         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 346
 347         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 348                                    dram_data, hdr->dram_size);
 349         if (ret)
 350                 return ret;
 351
 352         ret = cdn_dp_set_firmware_active(dp, true);
 353         if (ret) {
 354                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 355                 return ret;
 356         }
 357
 358         return cdn_dp_event_config(dp);
 359 }
 360
 361 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 362 {
 363         const struct drm_display_info *info = &dp->connector.display_info;
 364         int ret;
 365
 366         if (!cdn_dp_check_sink_connection(dp))
 367                 return -ENODEV;
 368
 369         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 370                                DP_RECEIVER_CAP_SIZE);
 371         if (ret) {
 372                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 373                 return ret;
 374         }
 375
 376         drm_edid_free(dp->drm_edid);
 377         dp->drm_edid = drm_edid_read_custom(&dp->connector,
 378                                             cdn_dp_get_edid_block, dp);
 379         drm_edid_connector_update(&dp->connector, dp->drm_edid);
 380
 381         dp->sink_has_audio = info->has_audio;
 382
 383         if (dp->drm_edid)
 384                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 385                                   info->width_mm / 10, info->height_mm / 10);
 386
 387         return 0;
 388 }
 389
 390 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 391 {
 392         union extcon_property_value property;
 393         int ret;
 394
 395         if (!port->phy_enabled) {
 396                 ret = phy_power_on(port->phy);
 397                 if (ret) {
 398                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 399                                       ret);
 400                         goto err_phy;
 401                 }
 402                 port->phy_enabled = true;
 403         }
 404
 405         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 406                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 407         if (ret) {
 408                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 409                 goto err_power_on;
 410         }
 411
 412         ret = cdn_dp_get_hpd_status(dp);
 413         if (ret <= 0) {
 414                 if (!ret)
 415                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 416                 goto err_power_on;
 417         }
 418
 419         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 420                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 421         if (ret) {
 422                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 423                 goto err_power_on;
 424         }
 425
 426         port->lanes = cdn_dp_get_port_lanes(port);
 427         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 428         if (ret) {
 429                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 430                               ret);
 431                 goto err_power_on;
 432         }
 433
 434         dp->active_port = port->id;
 435         return 0;
 436
 437 err_power_on:
 438         if (phy_power_off(port->phy))
 439                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 440         else
 441                 port->phy_enabled = false;
 442
 443 err_phy:
 444         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 445                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 446         return ret;
 447 }
 448
 449 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 450                               struct cdn_dp_port *port)
 451 {
 452         int ret;
 453
 454         if (port->phy_enabled) {
 455                 ret = phy_power_off(port->phy);
 456                 if (ret) {
 457                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 458                         return ret;
 459                 }
 460         }
 461
 462         port->phy_enabled = false;
 463         port->lanes = 0;
 464         dp->active_port = -1;
 465         return 0;
 466 }
 467
 468 static int cdn_dp_disable(struct cdn_dp_device *dp)
 469 {
 470         int ret, i;
 471
 472         if (!dp->active)
 473                 return 0;
 474
 475         for (i = 0; i < dp->ports; i++)
 476                 cdn_dp_disable_phy(dp, dp->port[i]);
 477
 478         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 479                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 480         if (ret) {
 481                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 482                               ret);
 483                 return ret;
 484         }
 485
 486         cdn_dp_set_firmware_active(dp, false);
 487         cdn_dp_clk_disable(dp);
 488         dp->active = false;
 489         dp->max_lanes = 0;
 490         dp->max_rate = 0;
 491         if (!dp->connected) {
 492                 drm_edid_free(dp->drm_edid);
 493                 dp->drm_edid = NULL;
 494         }
 495
 496         return 0;
 497 }
 498
 499 static int cdn_dp_enable(struct cdn_dp_device *dp)
 500 {
 501         int ret, i, lanes;
 502         struct cdn_dp_port *port;
 503
 504         port = cdn_dp_connected_port(dp);
 505         if (!port) {
 506                 DRM_DEV_ERROR(dp->dev,
 507                               "Can't enable without connection\n");
 508                 return -ENODEV;
 509         }
 510
 511         if (dp->active)
 512                 return 0;
 513
 514         ret = cdn_dp_clk_enable(dp);
 515         if (ret)
 516                 return ret;
 517
 518         ret = cdn_dp_firmware_init(dp);
 519         if (ret) {
 520                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 521                 goto err_clk_disable;
 522         }
 523
 524         /* only enable the port that connected with downstream device */
 525         for (i = port->id; i < dp->ports; i++) {
 526                 port = dp->port[i];
 527                 lanes = cdn_dp_get_port_lanes(port);
 528                 if (lanes) {
 529                         ret = cdn_dp_enable_phy(dp, port);
 530                         if (ret)
 531                                 continue;
 532
 533                         ret = cdn_dp_get_sink_capability(dp);
 534                         if (ret) {
 535                                 cdn_dp_disable_phy(dp, port);
 536                         } else {
 537                                 dp->active = true;
 538                                 dp->lanes = port->lanes;
 539                                 return 0;
 540                         }
 541                 }
 542         }
 543
 544 err_clk_disable:
 545         cdn_dp_clk_disable(dp);
 546         return ret;
 547 }
 548
 549 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 550                                     struct drm_display_mode *mode,
 551                                     struct drm_display_mode *adjusted)
 552 {
 553         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 554         struct drm_display_info *display_info = &dp->connector.display_info;
 555         struct video_info *video = &dp->video_info;
 556
 557         switch (display_info->bpc) {
 558         case 10:
 559                 video->color_depth = 10;
 560                 break;
 561         case 6:
 562                 video->color_depth = 6;
 563                 break;
 564         default:
 565                 video->color_depth = 8;
 566                 break;
 567         }
 568
 569         video->color_fmt = PXL_RGB;
 570         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 571         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 572
 573         drm_mode_copy(&dp->mode, adjusted);
 574 }
 575
 576 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 577 {
 578         u8 link_status[DP_LINK_STATUS_SIZE];
 579         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 580         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 581
 582         if (!port || !dp->max_rate || !dp->max_lanes)
 583                 return false;
 584
 585         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 586                              DP_LINK_STATUS_SIZE)) {
 587                 DRM_ERROR("Failed to get link status\n");
 588                 return false;
 589         }
 590
 591         /* if link training is requested we should perform it always */
 592         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 593 }
 594
 595 static void cdn_dp_audio_handle_plugged_change(struct cdn_dp_device *dp,
 596                                                bool plugged)
 597 {
 598         if (dp->codec_dev)
 599                 dp->plugged_cb(dp->codec_dev, plugged);
 600 }
 601
 602 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 603 {
 604         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 605         int ret, val;
 606
 607         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 608         if (ret < 0) {
 609                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 610                 return;
 611         }
 612
 613         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 614                           (ret) ? "LIT" : "BIG");
 615         if (ret)
 616                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 617         else
 618                 val = DP_SEL_VOP_LIT << 16;
 619
 620         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 621         if (ret)
 622                 return;
 623
 624         mutex_lock(&dp->lock);
 625
 626         ret = cdn_dp_enable(dp);
 627         if (ret) {
 628                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 629                               ret);
 630                 goto out;
 631         }
 632         if (!cdn_dp_check_link_status(dp)) {
 633                 ret = cdn_dp_train_link(dp);
 634                 if (ret) {
 635                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 636                         goto out;
 637                 }
 638         }
 639
 640         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 641         if (ret) {
 642                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 643                 goto out;
 644         }
 645
 646         ret = cdn_dp_config_video(dp);
 647         if (ret) {
 648                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 649                 goto out;
 650         }
 651
 652         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 653         if (ret) {
 654                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 655                 goto out;
 656         }
 657
 658         cdn_dp_audio_handle_plugged_change(dp, true);
 659
 660 out:
 661         mutex_unlock(&dp->lock);
 662 }
 663
 664 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 665 {
 666         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 667         int ret;
 668
 669         mutex_lock(&dp->lock);
 670         cdn_dp_audio_handle_plugged_change(dp, false);
 671
 672         if (dp->active) {
 673                 ret = cdn_dp_disable(dp);
 674                 if (ret) {
 675                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 676                                       ret);
 677                 }
 678         }
 679         mutex_unlock(&dp->lock);
 680
 681         /*
 682          * In the following 2 cases, we need to run the event_work to re-enable
 683          * the DP:
 684          * 1. If there is not just one port device is connected, and remove one
 685          *    device from a port, the DP will be disabled here, at this case,
 686          *    run the event_work to re-open DP for the other port.
 687          * 2. If re-training or re-config failed, the DP will be disabled here.
 688          *    run the event_work to re-connect it.
 689          */
 690         if (!dp->connected && cdn_dp_connected_port(dp))
 691                 schedule_work(&dp->event_work);
 692 }
 693
 694 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 695                                        struct drm_crtc_state *crtc_state,
 696                                        struct drm_connector_state *conn_state)
 697 {
 698         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 699
 700         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 701         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 702
 703         return 0;
 704 }
 705
 706 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 707         .mode_set = cdn_dp_encoder_mode_set,
 708         .enable = cdn_dp_encoder_enable,
 709         .disable = cdn_dp_encoder_disable,
 710         .atomic_check = cdn_dp_encoder_atomic_check,
 711 };
 712
 713 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 714 {
 715         struct device *dev = dp->dev;
 716         struct device_node *np = dev->of_node;
 717         struct platform_device *pdev = to_platform_device(dev);
 718
 719         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 720         if (IS_ERR(dp->grf)) {
 721                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 722                 return PTR_ERR(dp->grf);
 723         }
 724
 725         dp->regs = devm_platform_ioremap_resource(pdev, 0);
 726         if (IS_ERR(dp->regs)) {
 727                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 728                 return PTR_ERR(dp->regs);
 729         }
 730
 731         dp->core_clk = devm_clk_get(dev, "core-clk");
 732         if (IS_ERR(dp->core_clk)) {
 733                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 734                 return PTR_ERR(dp->core_clk);
 735         }
 736
 737         dp->pclk = devm_clk_get(dev, "pclk");
 738         if (IS_ERR(dp->pclk)) {
 739                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 740                 return PTR_ERR(dp->pclk);
 741         }
 742
 743         dp->spdif_clk = devm_clk_get(dev, "spdif");
 744         if (IS_ERR(dp->spdif_clk)) {
 745                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 746                 return PTR_ERR(dp->spdif_clk);
 747         }
 748
 749         dp->grf_clk = devm_clk_get(dev, "grf");
 750         if (IS_ERR(dp->grf_clk)) {
 751                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 752                 return PTR_ERR(dp->grf_clk);
 753         }
 754
 755         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 756         if (IS_ERR(dp->spdif_rst)) {
 757                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 758                 return PTR_ERR(dp->spdif_rst);
 759         }
 760
 761         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 762         if (IS_ERR(dp->dptx_rst)) {
 763                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 764                 return PTR_ERR(dp->dptx_rst);
 765         }
 766
 767         dp->core_rst = devm_reset_control_get(dev, "core");
 768         if (IS_ERR(dp->core_rst)) {
 769                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 770                 return PTR_ERR(dp->core_rst);
 771         }
 772
 773         dp->apb_rst = devm_reset_control_get(dev, "apb");
 774         if (IS_ERR(dp->apb_rst)) {
 775                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 776                 return PTR_ERR(dp->apb_rst);
 777         }
 778
 779         return 0;
 780 }
 781
 782 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 783                                   struct hdmi_codec_daifmt *daifmt,
 784                                   struct hdmi_codec_params *params)
 785 {
 786         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 787         struct audio_info audio = {
 788                 .sample_width = params->sample_width,
 789                 .sample_rate = params->sample_rate,
 790                 .channels = params->channels,
 791         };
 792         int ret;
 793
 794         mutex_lock(&dp->lock);
 795         if (!dp->active) {
 796                 ret = -ENODEV;
 797                 goto out;
 798         }
 799
 800         switch (daifmt->fmt) {
 801         case HDMI_I2S:
 802                 audio.format = AFMT_I2S;
 803                 break;
 804         case HDMI_SPDIF:
 805                 audio.format = AFMT_SPDIF;
 806                 break;
 807         default:
 808                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 809                 ret = -EINVAL;
 810                 goto out;
 811         }
 812
 813         ret = cdn_dp_audio_config(dp, &audio);
 814         if (!ret)
 815                 dp->audio_info = audio;
 816
 817 out:
 818         mutex_unlock(&dp->lock);
 819         return ret;
 820 }
 821
 822 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 823 {
 824         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 825         int ret;
 826
 827         mutex_lock(&dp->lock);
 828         if (!dp->active)
 829                 goto out;
 830
 831         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 832         if (!ret)
 833                 dp->audio_info.format = AFMT_UNUSED;
 834 out:
 835         mutex_unlock(&dp->lock);
 836 }
 837
 838 static int cdn_dp_audio_mute_stream(struct device *dev, void *data,
 839                                     bool enable, int direction)
 840 {
 841         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 842         int ret;
 843
 844         mutex_lock(&dp->lock);
 845         if (!dp->active) {
 846                 ret = -ENODEV;
 847                 goto out;
 848         }
 849
 850         ret = cdn_dp_audio_mute(dp, enable);
 851
 852 out:
 853         mutex_unlock(&dp->lock);
 854         return ret;
 855 }
 856
 857 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 858                                 u8 *buf, size_t len)
 859 {
 860         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 861
 862         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 863
 864         return 0;
 865 }
 866
 867 static int cdn_dp_audio_hook_plugged_cb(struct device *dev, void *data,
 868                                         hdmi_codec_plugged_cb fn,
 869                                         struct device *codec_dev)
 870 {
 871         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 872
 873         mutex_lock(&dp->lock);
 874         dp->plugged_cb = fn;
 875         dp->codec_dev = codec_dev;
 876         cdn_dp_audio_handle_plugged_change(dp, dp->connected);
 877         mutex_unlock(&dp->lock);
 878
 879         return 0;
 880 }
 881
 882 static const struct hdmi_codec_ops audio_codec_ops = {
 883         .hw_params = cdn_dp_audio_hw_params,
 884         .audio_shutdown = cdn_dp_audio_shutdown,
 885         .mute_stream = cdn_dp_audio_mute_stream,
 886         .get_eld = cdn_dp_audio_get_eld,
 887         .hook_plugged_cb = cdn_dp_audio_hook_plugged_cb,
 888 };
 889
 890 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 891                                    struct device *dev)
 892 {
 893         struct hdmi_codec_pdata codec_data = {
 894                 .i2s = 1,
 895                 .spdif = 1,
 896                 .ops = &audio_codec_ops,
 897                 .max_i2s_channels = 8,
 898                 .no_capture_mute = 1,
 899         };
 900
 901         dp->audio_pdev = platform_device_register_data(
 902                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 903                          &codec_data, sizeof(codec_data));
 904
 905         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 906 }
 907
 908 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 909 {
 910         int ret;
 911         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 912         unsigned long sleep = 1000;
 913
 914         WARN_ON(!mutex_is_locked(&dp->lock));
 915
 916         if (dp->fw_loaded)
 917                 return 0;
 918
 919         /* Drop the lock before getting the firmware to avoid blocking boot */
 920         mutex_unlock(&dp->lock);
 921
 922         while (time_before(jiffies, timeout)) {
 923                 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 924                 if (ret == -ENOENT) {
 925                         msleep(sleep);
 926                         sleep *= 2;
 927                         continue;
 928                 } else if (ret) {
 929                         DRM_DEV_ERROR(dp->dev,
 930                                       "failed to request firmware: %d\n", ret);
 931                         goto out;
 932                 }
 933
 934                 dp->fw_loaded = true;
 935                 ret = 0;
 936                 goto out;
 937         }
 938
 939         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 940         ret = -ETIMEDOUT;
 941 out:
 942         mutex_lock(&dp->lock);
 943         return ret;
 944 }
 945
 946 static void cdn_dp_pd_event_work(struct work_struct *work)
 947 {
 948         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 949                                                 event_work);
 950         int ret;
 951
 952         mutex_lock(&dp->lock);
 953
 954         if (dp->suspended)
 955                 goto out;
 956
 957         ret = cdn_dp_request_firmware(dp);
 958         if (ret)
 959                 goto out;
 960
 961         dp->connected = true;
 962
 963         /* Not connected, notify userspace to disable the block */
 964         if (!cdn_dp_connected_port(dp)) {
 965                 DRM_DEV_INFO(dp->dev, "Not connected; disabling cdn\n");
 966                 dp->connected = false;
 967
 968         /* Connected but not enabled, enable the block */
 969         } else if (!dp->active) {
 970                 DRM_DEV_INFO(dp->dev, "Connected, not enabled; enabling cdn\n");
 971                 ret = cdn_dp_enable(dp);
 972                 if (ret) {
 973                         DRM_DEV_ERROR(dp->dev, "Enabling dp failed: %d\n", ret);
 974                         dp->connected = false;
 975                 }
 976
 977         /* Enabled and connected to a dongle without a sink, notify userspace */
 978         } else if (!cdn_dp_check_sink_connection(dp)) {
 979                 DRM_DEV_INFO(dp->dev, "Connected without sink; assert hpd\n");
 980                 dp->connected = false;
 981
 982         /* Enabled and connected with a sink, re-train if requested */
 983         } else if (!cdn_dp_check_link_status(dp)) {
 984                 unsigned int rate = dp->max_rate;
 985                 unsigned int lanes = dp->max_lanes;
 986                 struct drm_display_mode *mode = &dp->mode;
 987
 988                 DRM_DEV_INFO(dp->dev, "Connected with sink; re-train link\n");
 989                 ret = cdn_dp_train_link(dp);
 990                 if (ret) {
 991                         dp->connected = false;
 992                         DRM_DEV_ERROR(dp->dev, "Training link failed: %d\n", ret);
 993                         goto out;
 994                 }
 995
 996                 /* If training result is changed, update the video config */
 997                 if (mode->clock &&
 998                     (rate != dp->max_rate || lanes != dp->max_lanes)) {
 999                         ret = cdn_dp_config_video(dp);
1000                         if (ret) {
1001                                 dp->connected = false;
1002                                 DRM_DEV_ERROR(dp->dev, "Failed to configure video: %d\n", ret);
1003                         }
1004                 }
1005         }
1006
1007 out:
1008         mutex_unlock(&dp->lock);
1009         drm_connector_helper_hpd_irq_event(&dp->connector);
1010 }
1011
1012 static int cdn_dp_pd_event(struct notifier_block *nb,
1013                            unsigned long event, void *priv)
1014 {
1015         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1016                                                 event_nb);
1017         struct cdn_dp_device *dp = port->dp;
1018
1019         /*
1020          * It would be nice to be able to just do the work inline right here.
1021          * However, we need to make a bunch of calls that might sleep in order
1022          * to turn on the block/phy, so use a worker instead.
1023          */
1024         schedule_work(&dp->event_work);
1025
1026         return NOTIFY_DONE;
1027 }
1028
1029 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1030 {
1031         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1032         struct drm_encoder *encoder;
1033         struct drm_connector *connector;
1034         struct cdn_dp_port *port;
1035         struct drm_device *drm_dev = data;
1036         int ret, i;
1037
1038         ret = cdn_dp_parse_dt(dp);
1039         if (ret < 0)
1040                 return ret;
1041
1042         dp->drm_dev = drm_dev;
1043         dp->connected = false;
1044         dp->active = false;
1045         dp->active_port = -1;
1046         dp->fw_loaded = false;
1047
1048         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1049
1050         encoder = &dp->encoder.encoder;
1051
1052         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1053                                                              dev->of_node);
1054         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1055
1056         ret = drm_simple_encoder_init(drm_dev, encoder,
1057                                       DRM_MODE_ENCODER_TMDS);
1058         if (ret) {
1059                 DRM_ERROR("failed to initialize encoder with drm\n");
1060                 return ret;
1061         }
1062
1063         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1064
1065         connector = &dp->connector;
1066         connector->polled = DRM_CONNECTOR_POLL_HPD;
1067         connector->dpms = DRM_MODE_DPMS_OFF;
1068
1069         ret = drm_connector_init(drm_dev, connector,
1070                                  &cdn_dp_atomic_connector_funcs,
1071                                  DRM_MODE_CONNECTOR_DisplayPort);
1072         if (ret) {
1073                 DRM_ERROR("failed to initialize connector with drm\n");
1074                 goto err_free_encoder;
1075         }
1076
1077         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1078
1079         ret = drm_connector_attach_encoder(connector, encoder);
1080         if (ret) {
1081                 DRM_ERROR("failed to attach connector and encoder\n");
1082                 goto err_free_connector;
1083         }
1084
1085         for (i = 0; i < dp->ports; i++) {
1086                 port = dp->port[i];
1087
1088                 port->event_nb.notifier_call = cdn_dp_pd_event;
1089                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1090                                                     EXTCON_DISP_DP,
1091                                                     &port->event_nb);
1092                 if (ret) {
1093                         DRM_DEV_ERROR(dev,
1094                                       "register EXTCON_DISP_DP notifier err\n");
1095                         goto err_free_connector;
1096                 }
1097         }
1098
1099         pm_runtime_enable(dev);
1100
1101         schedule_work(&dp->event_work);
1102
1103         return 0;
1104
1105 err_free_connector:
1106         drm_connector_cleanup(connector);
1107 err_free_encoder:
1108         drm_encoder_cleanup(encoder);
1109         return ret;
1110 }
1111
1112 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1113 {
1114         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1115         struct drm_encoder *encoder = &dp->encoder.encoder;
1116         struct drm_connector *connector = &dp->connector;
1117
1118         cancel_work_sync(&dp->event_work);
1119         cdn_dp_encoder_disable(encoder);
1120         encoder->funcs->destroy(encoder);
1121         connector->funcs->destroy(connector);
1122
1123         pm_runtime_disable(dev);
1124         if (dp->fw_loaded)
1125                 release_firmware(dp->fw);
1126         drm_edid_free(dp->drm_edid);
1127         dp->drm_edid = NULL;
1128 }
1129
1130 static const struct component_ops cdn_dp_component_ops = {
1131         .bind = cdn_dp_bind,
1132         .unbind = cdn_dp_unbind,
1133 };
1134
1135 static int cdn_dp_suspend(struct device *dev)
1136 {
1137         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1138         int ret = 0;
1139
1140         mutex_lock(&dp->lock);
1141         if (dp->active)
1142                 ret = cdn_dp_disable(dp);
1143         dp->suspended = true;
1144         mutex_unlock(&dp->lock);
1145
1146         return ret;
1147 }
1148
1149 static __maybe_unused int cdn_dp_resume(struct device *dev)
1150 {
1151         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1152
1153         mutex_lock(&dp->lock);
1154         dp->suspended = false;
1155         if (dp->fw_loaded)
1156                 schedule_work(&dp->event_work);
1157         mutex_unlock(&dp->lock);
1158
1159         return 0;
1160 }
1161
1162 static int cdn_dp_probe(struct platform_device *pdev)
1163 {
1164         struct device *dev = &pdev->dev;
1165         const struct of_device_id *match;
1166         struct cdn_dp_data *dp_data;
1167         struct cdn_dp_port *port;
1168         struct cdn_dp_device *dp;
1169         struct extcon_dev *extcon;
1170         struct phy *phy;
1171         int ret;
1172         int i;
1173
1174         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1175         if (!dp)
1176                 return -ENOMEM;
1177         dp->dev = dev;
1178
1179         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1180         dp_data = (struct cdn_dp_data *)match->data;
1181
1182         for (i = 0; i < dp_data->max_phy; i++) {
1183                 extcon = extcon_get_edev_by_phandle(dev, i);
1184                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1185
1186                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1187                     PTR_ERR(phy) == -EPROBE_DEFER)
1188                         return -EPROBE_DEFER;
1189
1190                 if (IS_ERR(extcon) || IS_ERR(phy))
1191                         continue;
1192
1193                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1194                 if (!port)
1195                         return -ENOMEM;
1196
1197                 port->extcon = extcon;
1198                 port->phy = phy;
1199                 port->dp = dp;
1200                 port->id = i;
1201                 dp->port[dp->ports++] = port;
1202         }
1203
1204         if (!dp->ports) {
1205                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1206                 return -EINVAL;
1207         }
1208
1209         mutex_init(&dp->lock);
1210         dev_set_drvdata(dev, dp);
1211
1212         ret = cdn_dp_audio_codec_init(dp, dev);
1213         if (ret)
1214                 return ret;
1215
1216         ret = component_add(dev, &cdn_dp_component_ops);
1217         if (ret)
1218                 goto err_audio_deinit;
1219
1220         return 0;
1221
1222 err_audio_deinit:
1223         platform_device_unregister(dp->audio_pdev);
1224         return ret;
1225 }
1226
1227 static void cdn_dp_remove(struct platform_device *pdev)
1228 {
1229         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1230
1231         platform_device_unregister(dp->audio_pdev);
1232         cdn_dp_suspend(dp->dev);
1233         component_del(&pdev->dev, &cdn_dp_component_ops);
1234 }
1235
1236 static void cdn_dp_shutdown(struct platform_device *pdev)
1237 {
1238         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1239
1240         cdn_dp_suspend(dp->dev);
1241 }
1242
1243 static const struct dev_pm_ops cdn_dp_pm_ops = {
1244         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1245                                 cdn_dp_resume)
1246 };
1247
1248 struct platform_driver cdn_dp_driver = {
1249         .probe = cdn_dp_probe,
1250         .remove = cdn_dp_remove,
1251         .shutdown = cdn_dp_shutdown,
1252         .driver = {
1253                    .name = "cdn-dp",
1254                    .of_match_table = cdn_dp_dt_ids,
1255                    .pm = &cdn_dp_pm_ops,
1256         },
1257 };