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

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