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         "rockchip/dptx.bin"
  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                 return ret;
  85         }
  86
  87         clk_disable_unprepare(dp->grf_clk);
  88
  89         return 0;
  90 }
  91
  92 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
  93 {
  94         int ret;
  95         unsigned long rate;
  96
  97         ret = clk_prepare_enable(dp->pclk);
  98         if (ret < 0) {
  99                 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
 100                 goto err_pclk;
 101         }
 102
 103         ret = clk_prepare_enable(dp->core_clk);
 104         if (ret < 0) {
 105                 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
 106                 goto err_core_clk;
 107         }
 108
 109         ret = pm_runtime_get_sync(dp->dev);
 110         if (ret < 0) {
 111                 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 112                 goto err_pm_runtime_get;
 113         }
 114
 115         reset_control_assert(dp->core_rst);
 116         reset_control_assert(dp->dptx_rst);
 117         reset_control_assert(dp->apb_rst);
 118         reset_control_deassert(dp->core_rst);
 119         reset_control_deassert(dp->dptx_rst);
 120         reset_control_deassert(dp->apb_rst);
 121
 122         rate = clk_get_rate(dp->core_clk);
 123         if (!rate) {
 124                 DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
 125                 ret = -EINVAL;
 126                 goto err_set_rate;
 127         }
 128
 129         cdn_dp_set_fw_clk(dp, rate);
 130         cdn_dp_clock_reset(dp);
 131
 132         return 0;
 133
 134 err_set_rate:
 135         pm_runtime_put(dp->dev);
 136 err_pm_runtime_get:
 137         clk_disable_unprepare(dp->core_clk);
 138 err_core_clk:
 139         clk_disable_unprepare(dp->pclk);
 140 err_pclk:
 141         return ret;
 142 }
 143
 144 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 145 {
 146         pm_runtime_put_sync(dp->dev);
 147         clk_disable_unprepare(dp->pclk);
 148         clk_disable_unprepare(dp->core_clk);
 149 }
 150
 151 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 152 {
 153         struct extcon_dev *edev = port->extcon;
 154         union extcon_property_value property;
 155         int dptx;
 156         u8 lanes;
 157
 158         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 159         if (dptx > 0) {
 160                 extcon_get_property(edev, EXTCON_DISP_DP,
 161                                     EXTCON_PROP_USB_SS, &property);
 162                 if (property.intval)
 163                         lanes = 2;
 164                 else
 165                         lanes = 4;
 166         } else {
 167                 lanes = 0;
 168         }
 169
 170         return lanes;
 171 }
 172
 173 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 174 {
 175         int ret;
 176         u8 value;
 177
 178         *sink_count = 0;
 179         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 180         if (ret)
 181                 return ret;
 182
 183         *sink_count = DP_GET_SINK_COUNT(value);
 184         return 0;
 185 }
 186
 187 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 188 {
 189         struct cdn_dp_port *port;
 190         int i, lanes;
 191
 192         for (i = 0; i < dp->ports; i++) {
 193                 port = dp->port[i];
 194                 lanes = cdn_dp_get_port_lanes(port);
 195                 if (lanes)
 196                         return port;
 197         }
 198         return NULL;
 199 }
 200
 201 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
 202 {
 203         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 204         struct cdn_dp_port *port;
 205         u8 sink_count = 0;
 206
 207         if (dp->active_port < 0 || dp->active_port >= dp->ports) {
 208                 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
 209                 return false;
 210         }
 211
 212         port = dp->port[dp->active_port];
 213
 214         /*
 215          * Attempt to read sink count, retry in case the sink may not be ready.
 216          *
 217          * Sinks are *supposed* to come up within 1ms from an off state, but
 218          * some docks need more time to power up.
 219          */
 220         while (time_before(jiffies, timeout)) {
 221                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 222                         return false;
 223
 224                 if (!cdn_dp_get_sink_count(dp, &sink_count))
 225                         return sink_count ? true : false;
 226
 227                 usleep_range(5000, 10000);
 228         }
 229
 230         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 231         return false;
 232 }
 233
 234 static enum drm_connector_status
 235 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 236 {
 237         struct cdn_dp_device *dp = connector_to_dp(connector);
 238         enum drm_connector_status status = connector_status_disconnected;
 239
 240         mutex_lock(&dp->lock);
 241         if (dp->connected)
 242                 status = connector_status_connected;
 243         mutex_unlock(&dp->lock);
 244
 245         return status;
 246 }
 247
 248 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 249 {
 250         drm_connector_unregister(connector);
 251         drm_connector_cleanup(connector);
 252 }
 253
 254 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 255         .detect = cdn_dp_connector_detect,
 256         .destroy = cdn_dp_connector_destroy,
 257         .fill_modes = drm_helper_probe_single_connector_modes,
 258         .reset = drm_atomic_helper_connector_reset,
 259         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 260         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 261 };
 262
 263 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 264 {
 265         struct cdn_dp_device *dp = connector_to_dp(connector);
 266         struct edid *edid;
 267         int ret = 0;
 268
 269         mutex_lock(&dp->lock);
 270         edid = dp->edid;
 271         if (edid) {
 272                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 273                                   edid->width_cm, edid->height_cm);
 274
 275                 dp->sink_has_audio = drm_detect_monitor_audio(edid);
 276                 ret = drm_add_edid_modes(connector, edid);
 277                 if (ret)
 278                         drm_mode_connector_update_edid_property(connector,
 279                                                                 edid);
 280         }
 281         mutex_unlock(&dp->lock);
 282
 283         return ret;
 284 }
 285
 286 static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 287                                        struct drm_display_mode *mode)
 288 {
 289         struct cdn_dp_device *dp = connector_to_dp(connector);
 290         struct drm_display_info *display_info = &dp->connector.display_info;
 291         u32 requested, actual, rate, sink_max, source_max = 0;
 292         u8 lanes, bpc;
 293
 294         /* If DP is disconnected, every mode is invalid */
 295         if (!dp->connected)
 296                 return MODE_BAD;
 297
 298         switch (display_info->bpc) {
 299         case 10:
 300                 bpc = 10;
 301                 break;
 302         case 6:
 303                 bpc = 6;
 304                 break;
 305         default:
 306                 bpc = 8;
 307                 break;
 308         }
 309
 310         requested = mode->clock * bpc * 3 / 1000;
 311
 312         source_max = dp->lanes;
 313         sink_max = drm_dp_max_lane_count(dp->dpcd);
 314         lanes = min(source_max, sink_max);
 315
 316         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 317         sink_max = drm_dp_max_link_rate(dp->dpcd);
 318         rate = min(source_max, sink_max);
 319
 320         actual = rate * lanes / 100;
 321
 322         /* efficiency is about 0.8 */
 323         actual = actual * 8 / 10;
 324
 325         if (requested > actual) {
 326                 DRM_DEV_DEBUG_KMS(dp->dev,
 327                                   "requested=%d, actual=%d, clock=%d\n",
 328                                   requested, actual, mode->clock);
 329                 return MODE_CLOCK_HIGH;
 330         }
 331
 332         return MODE_OK;
 333 }
 334
 335 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 336         .get_modes = cdn_dp_connector_get_modes,
 337         .mode_valid = cdn_dp_connector_mode_valid,
 338 };
 339
 340 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 341 {
 342         int ret;
 343         const u32 *iram_data, *dram_data;
 344         const struct firmware *fw = dp->fw;
 345         const struct cdn_firmware_header *hdr;
 346
 347         hdr = (struct cdn_firmware_header *)fw->data;
 348         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 349                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 350                 return -EINVAL;
 351         }
 352
 353         iram_data = (const u32 *)(fw->data + hdr->header_size);
 354         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 355
 356         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 357                                    dram_data, hdr->dram_size);
 358         if (ret)
 359                 return ret;
 360
 361         ret = cdn_dp_set_firmware_active(dp, true);
 362         if (ret) {
 363                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 364                 return ret;
 365         }
 366
 367         return cdn_dp_event_config(dp);
 368 }
 369
 370 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 371 {
 372         int ret;
 373
 374         if (!cdn_dp_check_sink_connection(dp))
 375                 return -ENODEV;
 376
 377         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 378                                DP_RECEIVER_CAP_SIZE);
 379         if (ret) {
 380                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 381                 return ret;
 382         }
 383
 384         kfree(dp->edid);
 385         dp->edid = drm_do_get_edid(&dp->connector,
 386                                    cdn_dp_get_edid_block, dp);
 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->link.rate = 0;
 490         dp->link.num_lanes = 0;
 491         if (!dp->connected) {
 492                 kfree(dp->edid);
 493                 dp->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         memcpy(&dp->mode, adjusted, sizeof(*mode));
 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->link.rate || !dp->link.num_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_encoder_enable(struct drm_encoder *encoder)
 596 {
 597         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 598         int ret, val;
 599
 600         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 601         if (ret < 0) {
 602                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 603                 return;
 604         }
 605
 606         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 607                           (ret) ? "LIT" : "BIG");
 608         if (ret)
 609                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 610         else
 611                 val = DP_SEL_VOP_LIT << 16;
 612
 613         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 614         if (ret)
 615                 return;
 616
 617         mutex_lock(&dp->lock);
 618
 619         ret = cdn_dp_enable(dp);
 620         if (ret) {
 621                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 622                               ret);
 623                 goto out;
 624         }
 625         if (!cdn_dp_check_link_status(dp)) {
 626                 ret = cdn_dp_train_link(dp);
 627                 if (ret) {
 628                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 629                         goto out;
 630                 }
 631         }
 632
 633         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 634         if (ret) {
 635                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 636                 goto out;
 637         }
 638
 639         ret = cdn_dp_config_video(dp);
 640         if (ret) {
 641                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 642                 goto out;
 643         }
 644
 645         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 646         if (ret) {
 647                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 648                 goto out;
 649         }
 650 out:
 651         mutex_unlock(&dp->lock);
 652 }
 653
 654 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 655 {
 656         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 657         int ret;
 658
 659         mutex_lock(&dp->lock);
 660         if (dp->active) {
 661                 ret = cdn_dp_disable(dp);
 662                 if (ret) {
 663                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 664                                       ret);
 665                 }
 666         }
 667         mutex_unlock(&dp->lock);
 668
 669         /*
 670          * In the following 2 cases, we need to run the event_work to re-enable
 671          * the DP:
 672          * 1. If there is not just one port device is connected, and remove one
 673          *    device from a port, the DP will be disabled here, at this case,
 674          *    run the event_work to re-open DP for the other port.
 675          * 2. If re-training or re-config failed, the DP will be disabled here.
 676          *    run the event_work to re-connect it.
 677          */
 678         if (!dp->connected && cdn_dp_connected_port(dp))
 679                 schedule_work(&dp->event_work);
 680 }
 681
 682 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 683                                        struct drm_crtc_state *crtc_state,
 684                                        struct drm_connector_state *conn_state)
 685 {
 686         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 687
 688         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 689         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 690
 691         return 0;
 692 }
 693
 694 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 695         .mode_set = cdn_dp_encoder_mode_set,
 696         .enable = cdn_dp_encoder_enable,
 697         .disable = cdn_dp_encoder_disable,
 698         .atomic_check = cdn_dp_encoder_atomic_check,
 699 };
 700
 701 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
 702         .destroy = drm_encoder_cleanup,
 703 };
 704
 705 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 706 {
 707         struct device *dev = dp->dev;
 708         struct device_node *np = dev->of_node;
 709         struct platform_device *pdev = to_platform_device(dev);
 710         struct resource *res;
 711
 712         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 713         if (IS_ERR(dp->grf)) {
 714                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 715                 return PTR_ERR(dp->grf);
 716         }
 717
 718         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 719         dp->regs = devm_ioremap_resource(dev, res);
 720         if (IS_ERR(dp->regs)) {
 721                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 722                 return PTR_ERR(dp->regs);
 723         }
 724
 725         dp->core_clk = devm_clk_get(dev, "core-clk");
 726         if (IS_ERR(dp->core_clk)) {
 727                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 728                 return PTR_ERR(dp->core_clk);
 729         }
 730
 731         dp->pclk = devm_clk_get(dev, "pclk");
 732         if (IS_ERR(dp->pclk)) {
 733                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 734                 return PTR_ERR(dp->pclk);
 735         }
 736
 737         dp->spdif_clk = devm_clk_get(dev, "spdif");
 738         if (IS_ERR(dp->spdif_clk)) {
 739                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 740                 return PTR_ERR(dp->spdif_clk);
 741         }
 742
 743         dp->grf_clk = devm_clk_get(dev, "grf");
 744         if (IS_ERR(dp->grf_clk)) {
 745                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 746                 return PTR_ERR(dp->grf_clk);
 747         }
 748
 749         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 750         if (IS_ERR(dp->spdif_rst)) {
 751                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 752                 return PTR_ERR(dp->spdif_rst);
 753         }
 754
 755         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 756         if (IS_ERR(dp->dptx_rst)) {
 757                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 758                 return PTR_ERR(dp->dptx_rst);
 759         }
 760
 761         dp->core_rst = devm_reset_control_get(dev, "core");
 762         if (IS_ERR(dp->core_rst)) {
 763                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 764                 return PTR_ERR(dp->core_rst);
 765         }
 766
 767         dp->apb_rst = devm_reset_control_get(dev, "apb");
 768         if (IS_ERR(dp->apb_rst)) {
 769                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 770                 return PTR_ERR(dp->apb_rst);
 771         }
 772
 773         return 0;
 774 }
 775
 776 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 777                                   struct hdmi_codec_daifmt *daifmt,
 778                                   struct hdmi_codec_params *params)
 779 {
 780         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 781         struct audio_info audio = {
 782                 .sample_width = params->sample_width,
 783                 .sample_rate = params->sample_rate,
 784                 .channels = params->channels,
 785         };
 786         int ret;
 787
 788         mutex_lock(&dp->lock);
 789         if (!dp->active) {
 790                 ret = -ENODEV;
 791                 goto out;
 792         }
 793
 794         switch (daifmt->fmt) {
 795         case HDMI_I2S:
 796                 audio.format = AFMT_I2S;
 797                 break;
 798         case HDMI_SPDIF:
 799                 audio.format = AFMT_SPDIF;
 800                 break;
 801         default:
 802                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 803                 ret = -EINVAL;
 804                 goto out;
 805         }
 806
 807         ret = cdn_dp_audio_config(dp, &audio);
 808         if (!ret)
 809                 dp->audio_info = audio;
 810
 811 out:
 812         mutex_unlock(&dp->lock);
 813         return ret;
 814 }
 815
 816 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 817 {
 818         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 819         int ret;
 820
 821         mutex_lock(&dp->lock);
 822         if (!dp->active)
 823                 goto out;
 824
 825         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 826         if (!ret)
 827                 dp->audio_info.format = AFMT_UNUSED;
 828 out:
 829         mutex_unlock(&dp->lock);
 830 }
 831
 832 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
 833                                      bool enable)
 834 {
 835         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 836         int ret;
 837
 838         mutex_lock(&dp->lock);
 839         if (!dp->active) {
 840                 ret = -ENODEV;
 841                 goto out;
 842         }
 843
 844         ret = cdn_dp_audio_mute(dp, enable);
 845
 846 out:
 847         mutex_unlock(&dp->lock);
 848         return ret;
 849 }
 850
 851 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 852                                 u8 *buf, size_t len)
 853 {
 854         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 855
 856         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 857
 858         return 0;
 859 }
 860
 861 static const struct hdmi_codec_ops audio_codec_ops = {
 862         .hw_params = cdn_dp_audio_hw_params,
 863         .audio_shutdown = cdn_dp_audio_shutdown,
 864         .digital_mute = cdn_dp_audio_digital_mute,
 865         .get_eld = cdn_dp_audio_get_eld,
 866 };
 867
 868 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 869                                    struct device *dev)
 870 {
 871         struct hdmi_codec_pdata codec_data = {
 872                 .i2s = 1,
 873                 .spdif = 1,
 874                 .ops = &audio_codec_ops,
 875                 .max_i2s_channels = 8,
 876         };
 877
 878         dp->audio_pdev = platform_device_register_data(
 879                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 880                          &codec_data, sizeof(codec_data));
 881
 882         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 883 }
 884
 885 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 886 {
 887         int ret;
 888         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 889         unsigned long sleep = 1000;
 890
 891         WARN_ON(!mutex_is_locked(&dp->lock));
 892
 893         if (dp->fw_loaded)
 894                 return 0;
 895
 896         /* Drop the lock before getting the firmware to avoid blocking boot */
 897         mutex_unlock(&dp->lock);
 898
 899         while (time_before(jiffies, timeout)) {
 900                 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 901                 if (ret == -ENOENT) {
 902                         msleep(sleep);
 903                         sleep *= 2;
 904                         continue;
 905                 } else if (ret) {
 906                         DRM_DEV_ERROR(dp->dev,
 907                                       "failed to request firmware: %d\n", ret);
 908                         goto out;
 909                 }
 910
 911                 dp->fw_loaded = true;
 912                 ret = 0;
 913                 goto out;
 914         }
 915
 916         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 917         ret = -ETIMEDOUT;
 918 out:
 919         mutex_lock(&dp->lock);
 920         return ret;
 921 }
 922
 923 static void cdn_dp_pd_event_work(struct work_struct *work)
 924 {
 925         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 926                                                 event_work);
 927         struct drm_connector *connector = &dp->connector;
 928         enum drm_connector_status old_status;
 929
 930         int ret;
 931
 932         mutex_lock(&dp->lock);
 933
 934         if (dp->suspended)
 935                 goto out;
 936
 937         ret = cdn_dp_request_firmware(dp);
 938         if (ret)
 939                 goto out;
 940
 941         dp->connected = true;
 942
 943         /* Not connected, notify userspace to disable the block */
 944         if (!cdn_dp_connected_port(dp)) {
 945                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
 946                 dp->connected = false;
 947
 948         /* Connected but not enabled, enable the block */
 949         } else if (!dp->active) {
 950                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
 951                 ret = cdn_dp_enable(dp);
 952                 if (ret) {
 953                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
 954                         dp->connected = false;
 955                 }
 956
 957         /* Enabled and connected to a dongle without a sink, notify userspace */
 958         } else if (!cdn_dp_check_sink_connection(dp)) {
 959                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
 960                 dp->connected = false;
 961
 962         /* Enabled and connected with a sink, re-train if requested */
 963         } else if (!cdn_dp_check_link_status(dp)) {
 964                 unsigned int rate = dp->link.rate;
 965                 unsigned int lanes = dp->link.num_lanes;
 966                 struct drm_display_mode *mode = &dp->mode;
 967
 968                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
 969                 ret = cdn_dp_train_link(dp);
 970                 if (ret) {
 971                         dp->connected = false;
 972                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
 973                         goto out;
 974                 }
 975
 976                 /* If training result is changed, update the video config */
 977                 if (mode->clock &&
 978                     (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
 979                         ret = cdn_dp_config_video(dp);
 980                         if (ret) {
 981                                 dp->connected = false;
 982                                 DRM_DEV_ERROR(dp->dev,
 983                                               "Failed to config video %d\n",
 984                                               ret);
 985                         }
 986                 }
 987         }
 988
 989 out:
 990         mutex_unlock(&dp->lock);
 991
 992         old_status = connector->status;
 993         connector->status = connector->funcs->detect(connector, false);
 994         if (old_status != connector->status)
 995                 drm_kms_helper_hotplug_event(dp->drm_dev);
 996 }
 997
 998 static int cdn_dp_pd_event(struct notifier_block *nb,
 999                            unsigned long event, void *priv)
1000 {
1001         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1002                                                 event_nb);
1003         struct cdn_dp_device *dp = port->dp;
1004
1005         /*
1006          * It would be nice to be able to just do the work inline right here.
1007          * However, we need to make a bunch of calls that might sleep in order
1008          * to turn on the block/phy, so use a worker instead.
1009          */
1010         schedule_work(&dp->event_work);
1011
1012         return NOTIFY_DONE;
1013 }
1014
1015 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1016 {
1017         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1018         struct drm_encoder *encoder;
1019         struct drm_connector *connector;
1020         struct cdn_dp_port *port;
1021         struct drm_device *drm_dev = data;
1022         int ret, i;
1023
1024         ret = cdn_dp_parse_dt(dp);
1025         if (ret < 0)
1026                 return ret;
1027
1028         dp->drm_dev = drm_dev;
1029         dp->connected = false;
1030         dp->active = false;
1031         dp->active_port = -1;
1032         dp->fw_loaded = false;
1033
1034         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1035
1036         encoder = &dp->encoder;
1037
1038         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1039                                                              dev->of_node);
1040         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1041
1042         ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1043                                DRM_MODE_ENCODER_TMDS, NULL);
1044         if (ret) {
1045                 DRM_ERROR("failed to initialize encoder with drm\n");
1046                 return ret;
1047         }
1048
1049         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1050
1051         connector = &dp->connector;
1052         connector->polled = DRM_CONNECTOR_POLL_HPD;
1053         connector->dpms = DRM_MODE_DPMS_OFF;
1054
1055         ret = drm_connector_init(drm_dev, connector,
1056                                  &cdn_dp_atomic_connector_funcs,
1057                                  DRM_MODE_CONNECTOR_DisplayPort);
1058         if (ret) {
1059                 DRM_ERROR("failed to initialize connector with drm\n");
1060                 goto err_free_encoder;
1061         }
1062
1063         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1064
1065         ret = drm_mode_connector_attach_encoder(connector, encoder);
1066         if (ret) {
1067                 DRM_ERROR("failed to attach connector and encoder\n");
1068                 goto err_free_connector;
1069         }
1070
1071         for (i = 0; i < dp->ports; i++) {
1072                 port = dp->port[i];
1073
1074                 port->event_nb.notifier_call = cdn_dp_pd_event;
1075                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1076                                                     EXTCON_DISP_DP,
1077                                                     &port->event_nb);
1078                 if (ret) {
1079                         DRM_DEV_ERROR(dev,
1080                                       "register EXTCON_DISP_DP notifier err\n");
1081                         goto err_free_connector;
1082                 }
1083         }
1084
1085         pm_runtime_enable(dev);
1086
1087         schedule_work(&dp->event_work);
1088
1089         return 0;
1090
1091 err_free_connector:
1092         drm_connector_cleanup(connector);
1093 err_free_encoder:
1094         drm_encoder_cleanup(encoder);
1095         return ret;
1096 }
1097
1098 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1099 {
1100         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1101         struct drm_encoder *encoder = &dp->encoder;
1102         struct drm_connector *connector = &dp->connector;
1103
1104         cancel_work_sync(&dp->event_work);
1105         cdn_dp_encoder_disable(encoder);
1106         encoder->funcs->destroy(encoder);
1107         connector->funcs->destroy(connector);
1108
1109         pm_runtime_disable(dev);
1110         if (dp->fw_loaded)
1111                 release_firmware(dp->fw);
1112         kfree(dp->edid);
1113         dp->edid = NULL;
1114 }
1115
1116 static const struct component_ops cdn_dp_component_ops = {
1117         .bind = cdn_dp_bind,
1118         .unbind = cdn_dp_unbind,
1119 };
1120
1121 int cdn_dp_suspend(struct device *dev)
1122 {
1123         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1124         int ret = 0;
1125
1126         mutex_lock(&dp->lock);
1127         if (dp->active)
1128                 ret = cdn_dp_disable(dp);
1129         dp->suspended = true;
1130         mutex_unlock(&dp->lock);
1131
1132         return ret;
1133 }
1134
1135 int cdn_dp_resume(struct device *dev)
1136 {
1137         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1138
1139         mutex_lock(&dp->lock);
1140         dp->suspended = false;
1141         if (dp->fw_loaded)
1142                 schedule_work(&dp->event_work);
1143         mutex_unlock(&dp->lock);
1144
1145         return 0;
1146 }
1147
1148 static int cdn_dp_probe(struct platform_device *pdev)
1149 {
1150         struct device *dev = &pdev->dev;
1151         const struct of_device_id *match;
1152         struct cdn_dp_data *dp_data;
1153         struct cdn_dp_port *port;
1154         struct cdn_dp_device *dp;
1155         struct extcon_dev *extcon;
1156         struct phy *phy;
1157         int i;
1158
1159         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1160         if (!dp)
1161                 return -ENOMEM;
1162         dp->dev = dev;
1163
1164         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1165         dp_data = (struct cdn_dp_data *)match->data;
1166
1167         for (i = 0; i < dp_data->max_phy; i++) {
1168                 extcon = extcon_get_edev_by_phandle(dev, i);
1169                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1170
1171                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1172                     PTR_ERR(phy) == -EPROBE_DEFER)
1173                         return -EPROBE_DEFER;
1174
1175                 if (IS_ERR(extcon) || IS_ERR(phy))
1176                         continue;
1177
1178                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1179                 if (!port)
1180                         return -ENOMEM;
1181
1182                 port->extcon = extcon;
1183                 port->phy = phy;
1184                 port->dp = dp;
1185                 port->id = i;
1186                 dp->port[dp->ports++] = port;
1187         }
1188
1189         if (!dp->ports) {
1190                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1191                 return -EINVAL;
1192         }
1193
1194         mutex_init(&dp->lock);
1195         dev_set_drvdata(dev, dp);
1196
1197         cdn_dp_audio_codec_init(dp, dev);
1198
1199         return component_add(dev, &cdn_dp_component_ops);
1200 }
1201
1202 static int cdn_dp_remove(struct platform_device *pdev)
1203 {
1204         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1205
1206         platform_device_unregister(dp->audio_pdev);
1207         cdn_dp_suspend(dp->dev);
1208         component_del(&pdev->dev, &cdn_dp_component_ops);
1209
1210         return 0;
1211 }
1212
1213 static void cdn_dp_shutdown(struct platform_device *pdev)
1214 {
1215         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1216
1217         cdn_dp_suspend(dp->dev);
1218 }
1219
1220 static const struct dev_pm_ops cdn_dp_pm_ops = {
1221         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1222                                 cdn_dp_resume)
1223 };
1224
1225 struct platform_driver cdn_dp_driver = {
1226         .probe = cdn_dp_probe,
1227         .remove = cdn_dp_remove,
1228         .shutdown = cdn_dp_shutdown,
1229         .driver = {
1230                    .name = "cdn-dp",
1231                    .owner = THIS_MODULE,
1232                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1233                    .pm = &cdn_dp_pm_ops,
1234         },
1235 };