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/hdmi-notifier.h>
  27 #include <linux/regmap.h>
  28 #include <linux/reset.h>
  29 #include <linux/mfd/syscon.h>
  30 #include <linux/phy/phy.h>
  31
  32 #include <sound/hdmi-codec.h>
  33
  34 #include "cdn-dp-core.h"
  35 #include "cdn-dp-reg.h"
  36 #include "rockchip_drm_vop.h"
  37
  38 #define connector_to_dp(c) \
  39                 container_of(c, struct cdn_dp_device, connector)
  40
  41 #define encoder_to_dp(c) \
  42                 container_of(c, struct cdn_dp_device, encoder)
  43
  44 #define GRF_SOC_CON9            0x6224
  45 #define DP_SEL_VOP_LIT          BIT(12)
  46 #define GRF_SOC_CON26           0x6268
  47 #define DPTX_HPD_SEL            (3 << 12)
  48 #define DPTX_HPD_DEL            (2 << 12)
  49 #define DPTX_HPD_SEL_MASK       (3 << 28)
  50
  51 #define CDN_FW_TIMEOUT_MS       (64 * 1000)
  52 #define CDN_DPCD_TIMEOUT_MS     5000
  53 #define CDN_DP_FIRMWARE         "rockchip/dptx.bin"
  54
  55 struct cdn_dp_data {
  56         u8 max_phy;
  57 };
  58
  59 struct cdn_dp_data rk3399_cdn_dp = {
  60         .max_phy = 2,
  61 };
  62
  63 static const struct of_device_id cdn_dp_dt_ids[] = {
  64         { .compatible = "rockchip,rk3399-cdn-dp",
  65                 .data = (void *)&rk3399_cdn_dp },
  66         {}
  67 };
  68
  69 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
  70
  71 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
  72                             unsigned int reg, unsigned int val)
  73 {
  74         int ret;
  75
  76         ret = clk_prepare_enable(dp->grf_clk);
  77         if (ret) {
  78                 DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
  79                 return ret;
  80         }
  81
  82         ret = regmap_write(dp->grf, reg, val);
  83         if (ret) {
  84                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
  85                 return ret;
  86         }
  87
  88         clk_disable_unprepare(dp->grf_clk);
  89
  90         return 0;
  91 }
  92
  93 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
  94 {
  95         int ret;
  96         u32 rate;
  97
  98         ret = clk_prepare_enable(dp->pclk);
  99         if (ret < 0) {
 100                 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
 101                 goto err_pclk;
 102         }
 103
 104         ret = clk_prepare_enable(dp->core_clk);
 105         if (ret < 0) {
 106                 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
 107                 goto err_core_clk;
 108         }
 109
 110         ret = pm_runtime_get_sync(dp->dev);
 111         if (ret < 0) {
 112                 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 113                 goto err_pclk;
 114         }
 115
 116         reset_control_assert(dp->core_rst);
 117         reset_control_assert(dp->dptx_rst);
 118         reset_control_assert(dp->apb_rst);
 119         reset_control_deassert(dp->core_rst);
 120         reset_control_deassert(dp->dptx_rst);
 121         reset_control_deassert(dp->apb_rst);
 122
 123         rate = clk_get_rate(dp->core_clk);
 124         if (!rate) {
 125                 DRM_DEV_ERROR(dp->dev, "get clk rate failed: %d\n", rate);
 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         clk_disable_unprepare(dp->core_clk);
 136 err_core_clk:
 137         clk_disable_unprepare(dp->pclk);
 138 err_pclk:
 139         return ret;
 140 }
 141
 142 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 143 {
 144         pm_runtime_put_sync(dp->dev);
 145         clk_disable_unprepare(dp->pclk);
 146         clk_disable_unprepare(dp->core_clk);
 147 }
 148
 149 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 150 {
 151         struct extcon_dev *edev = port->extcon;
 152         union extcon_property_value property;
 153         int dptx;
 154         u8 lanes;
 155
 156         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 157         if (dptx > 0) {
 158                 extcon_get_property(edev, EXTCON_DISP_DP,
 159                                     EXTCON_PROP_USB_SS, &property);
 160                 if (property.intval)
 161                         lanes = 2;
 162                 else
 163                         lanes = 4;
 164         } else {
 165                 lanes = 0;
 166         }
 167
 168         return lanes;
 169 }
 170
 171 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 172 {
 173         int ret;
 174         u8 value;
 175
 176         *sink_count = 0;
 177         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 178         if (ret)
 179                 return ret;
 180
 181         *sink_count = DP_GET_SINK_COUNT(value);
 182         return 0;
 183 }
 184
 185 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 186 {
 187         struct cdn_dp_port *port;
 188         int i, lanes;
 189
 190         for (i = 0; i < dp->ports; i++) {
 191                 port = dp->port[i];
 192                 lanes = cdn_dp_get_port_lanes(port);
 193                 if (lanes)
 194                         return port;
 195         }
 196         return NULL;
 197 }
 198
 199 static enum drm_connector_status
 200 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 201 {
 202         struct cdn_dp_device *dp = connector_to_dp(connector);
 203         enum drm_connector_status status = connector_status_disconnected;
 204
 205         mutex_lock(&dp->lock);
 206         if (dp->connected)
 207                 status = connector_status_connected;
 208         mutex_unlock(&dp->lock);
 209
 210         return status;
 211 }
 212
 213 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 214 {
 215         drm_connector_unregister(connector);
 216         drm_connector_cleanup(connector);
 217 }
 218
 219 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 220         .dpms = drm_atomic_helper_connector_dpms,
 221         .detect = cdn_dp_connector_detect,
 222         .destroy = cdn_dp_connector_destroy,
 223         .fill_modes = drm_helper_probe_single_connector_modes,
 224         .reset = drm_atomic_helper_connector_reset,
 225         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 226         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 227 };
 228
 229 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 230 {
 231         struct cdn_dp_device *dp = connector_to_dp(connector);
 232         struct edid *edid;
 233         int ret = 0;
 234
 235         mutex_lock(&dp->lock);
 236         edid = dp->edid;
 237         if (edid) {
 238                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 239                                   edid->width_cm, edid->height_cm);
 240
 241                 dp->sink_has_audio = drm_detect_monitor_audio(edid);
 242                 ret = drm_add_edid_modes(connector, edid);
 243                 if (ret) {
 244                         drm_mode_connector_update_edid_property(connector,
 245                                                                 edid);
 246                         drm_edid_to_eld(connector, edid);
 247                 }
 248         }
 249         mutex_unlock(&dp->lock);
 250
 251         return ret;
 252 }
 253
 254 static struct drm_encoder *
 255 cdn_dp_connector_best_encoder(struct drm_connector *connector)
 256 {
 257         struct cdn_dp_device *dp = connector_to_dp(connector);
 258
 259         return &dp->encoder;
 260 }
 261
 262 static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 263                                        struct drm_display_mode *mode)
 264 {
 265         struct cdn_dp_device *dp = connector_to_dp(connector);
 266         struct drm_display_info *display_info = &dp->connector.display_info;
 267         u32 requested, actual, rate, sink_max, source_max = 0;
 268         struct drm_encoder *encoder = connector->encoder;
 269         enum drm_mode_status status = MODE_OK;
 270         struct drm_device *dev = connector->dev;
 271         struct rockchip_drm_private *priv = dev->dev_private;
 272         struct drm_crtc *crtc;
 273         u8 lanes, bpc;
 274
 275         /* If DP is disconnected, every mode is invalid */
 276         if (!dp->connected)
 277                 return MODE_BAD;
 278
 279         switch (display_info->bpc) {
 280         case 10:
 281                 bpc = 10;
 282                 break;
 283         case 6:
 284                 bpc = 6;
 285                 break;
 286         default:
 287                 bpc = 8;
 288                 break;
 289         }
 290
 291         requested = mode->clock * bpc * 3 / 1000;
 292
 293         source_max = dp->lanes;
 294         sink_max = drm_dp_max_lane_count(dp->dpcd);
 295         lanes = min(source_max, sink_max);
 296
 297         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 298         sink_max = drm_dp_max_link_rate(dp->dpcd);
 299         rate = min(source_max, sink_max);
 300
 301         actual = rate * lanes / 100;
 302
 303         /* efficiency is about 0.8 */
 304         actual = actual * 8 / 10;
 305
 306         if (requested > actual) {
 307                 DRM_DEV_DEBUG_KMS(dp->dev,
 308                                   "requested=%d, actual=%d, clock=%d\n",
 309                                   requested, actual, mode->clock);
 310                 return MODE_CLOCK_HIGH;
 311         }
 312
 313         if (!encoder) {
 314                 const struct drm_connector_helper_funcs *funcs;
 315
 316                 funcs = connector->helper_private;
 317                 if (funcs->atomic_best_encoder)
 318                         encoder = funcs->atomic_best_encoder(connector,
 319                                                              connector->state);
 320                 else
 321                         encoder = funcs->best_encoder(connector);
 322         }
 323
 324         if (!encoder || !encoder->possible_crtcs)
 325                 return MODE_BAD;
 326         /*
 327          * ensure all drm display mode can work, if someone want support more
 328          * resolutions, please limit the possible_crtc, only connect to
 329          * needed crtc.
 330          */
 331         drm_for_each_crtc(crtc, connector->dev) {
 332                 int pipe = drm_crtc_index(crtc);
 333                 const struct rockchip_crtc_funcs *funcs =
 334                                                 priv->crtc_funcs[pipe];
 335
 336                 if (!(encoder->possible_crtcs & drm_crtc_mask(crtc)))
 337                         continue;
 338                 if (!funcs || !funcs->mode_valid)
 339                         continue;
 340
 341                 status = funcs->mode_valid(crtc, mode,
 342                                            DRM_MODE_CONNECTOR_HDMIA);
 343                 if (status != MODE_OK)
 344                         return status;
 345         }
 346
 347         return MODE_OK;
 348 }
 349
 350 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 351         .get_modes = cdn_dp_connector_get_modes,
 352         .best_encoder = cdn_dp_connector_best_encoder,
 353         .mode_valid = cdn_dp_connector_mode_valid,
 354 };
 355
 356 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 357 {
 358         int ret;
 359         const u32 *iram_data, *dram_data;
 360         const struct firmware *fw = dp->fw;
 361         const struct cdn_firmware_header *hdr;
 362
 363         hdr = (struct cdn_firmware_header *)fw->data;
 364         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 365                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 366                 return -EINVAL;
 367         }
 368
 369         iram_data = (const u32 *)(fw->data + hdr->header_size);
 370         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 371
 372         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 373                                    dram_data, hdr->dram_size);
 374         if (ret)
 375                 return ret;
 376
 377         ret = cdn_dp_set_firmware_active(dp, true);
 378         if (ret) {
 379                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 380                 return ret;
 381         }
 382
 383         return cdn_dp_event_config(dp);
 384 }
 385
 386 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp,
 387                                       struct cdn_dp_port *port,
 388                                       u8 *sink_count)
 389 {
 390         int ret;
 391         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 392
 393         /*
 394          * Attempt to read sink count & sink capability, retry in case the sink
 395          * may not be ready.
 396          *
 397          * Sinks are *supposed* to come up within 1ms from an off state, but
 398          * some docks need more time to power up.
 399          */
 400         while (time_before(jiffies, timeout)) {
 401                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 402                         return -ENODEV;
 403
 404                 if (cdn_dp_get_sink_count(dp, sink_count)) {
 405                         usleep_range(5000, 10000);
 406                         continue;
 407                 }
 408
 409                 if (!*sink_count)
 410                         return -ENODEV;
 411
 412                 ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 413                                        DP_RECEIVER_CAP_SIZE);
 414                 if (ret) {
 415                         DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 416                         return ret;
 417                 }
 418
 419                 kfree(dp->edid);
 420                 dp->edid = drm_do_get_edid(&dp->connector,
 421                                            cdn_dp_get_edid_block, dp);
 422                 return 0;
 423         }
 424
 425         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 426         return -ETIMEDOUT;
 427 }
 428
 429 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 430 {
 431         union extcon_property_value property;
 432         int ret;
 433
 434         if (!port->phy_enabled) {
 435                 ret = phy_power_on(port->phy);
 436                 if (ret) {
 437                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 438                                       ret);
 439                         goto err_phy;
 440                 }
 441                 port->phy_enabled = true;
 442         }
 443
 444         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 445                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 446         if (ret) {
 447                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 448                 goto err_power_on;
 449         }
 450
 451         ret = cdn_dp_get_hpd_status(dp);
 452         if (ret <= 0) {
 453                 if (!ret)
 454                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 455                 goto err_power_on;
 456         }
 457
 458         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 459                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 460         if (ret) {
 461                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 462                 goto err_power_on;
 463         }
 464
 465         port->lanes = cdn_dp_get_port_lanes(port);
 466         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 467         if (ret) {
 468                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 469                               ret);
 470                 goto err_power_on;
 471         }
 472
 473         return 0;
 474
 475 err_power_on:
 476         if (phy_power_off(port->phy))
 477                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 478         else
 479                 port->phy_enabled = false;
 480
 481 err_phy:
 482         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 483                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 484         return ret;
 485 }
 486
 487 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 488                               struct cdn_dp_port *port)
 489 {
 490         int ret;
 491
 492         if (port->phy_enabled) {
 493                 ret = phy_power_off(port->phy);
 494                 if (ret) {
 495                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 496                         return ret;
 497                 }
 498         }
 499
 500         port->phy_enabled = false;
 501         port->lanes = 0;
 502         return 0;
 503 }
 504
 505 static int cdn_dp_disable(struct cdn_dp_device *dp)
 506 {
 507         int ret, i;
 508
 509         if (!dp->active)
 510                 return 0;
 511
 512         for (i = 0; i < dp->ports; i++)
 513                 cdn_dp_disable_phy(dp, dp->port[i]);
 514
 515         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 516                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 517         if (ret) {
 518                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 519                               ret);
 520                 return ret;
 521         }
 522
 523         cdn_dp_set_firmware_active(dp, false);
 524         cdn_dp_clk_disable(dp);
 525         dp->active = false;
 526         dp->link.rate = 0;
 527         dp->link.num_lanes = 0;
 528         if (!dp->connected) {
 529                 kfree(dp->edid);
 530                 dp->edid = NULL;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static int cdn_dp_enable(struct cdn_dp_device *dp)
 537 {
 538         int ret, i, lanes;
 539         struct cdn_dp_port *port;
 540         u8 sink_count;
 541
 542         port = cdn_dp_connected_port(dp);
 543         if (!port) {
 544                 DRM_DEV_ERROR(dp->dev,
 545                               "Can't enable without connection\n");
 546                 return -ENODEV;
 547         }
 548
 549         if (dp->active)
 550                 return 0;
 551
 552         ret = cdn_dp_clk_enable(dp);
 553         if (ret)
 554                 return ret;
 555
 556         ret = cdn_dp_firmware_init(dp);
 557         if (ret) {
 558                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 559                 goto err_clk_disable;
 560         }
 561
 562         /* only enable the port that connected with downstream device */
 563         for (i = port->id; i < dp->ports; i++) {
 564                 port = dp->port[i];
 565                 lanes = cdn_dp_get_port_lanes(port);
 566                 if (lanes) {
 567                         ret = cdn_dp_enable_phy(dp, port);
 568                         if (ret)
 569                                 continue;
 570
 571                         ret = cdn_dp_get_sink_capability(dp, port, &sink_count);
 572                         if (ret || (!ret && !sink_count)) {
 573                                 cdn_dp_disable_phy(dp, port);
 574                         } else {
 575                                 dp->active = true;
 576                                 dp->lanes = port->lanes;
 577                                 return 0;
 578                         }
 579                 }
 580         }
 581
 582 err_clk_disable:
 583         cdn_dp_clk_disable(dp);
 584         return ret;
 585 }
 586
 587 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 588                                     struct drm_display_mode *mode,
 589                                     struct drm_display_mode *adjusted)
 590 {
 591         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 592         struct drm_display_info *display_info = &dp->connector.display_info;
 593         struct rockchip_crtc_state *state;
 594         struct video_info *video = &dp->video_info;
 595         int ret, val;
 596
 597         switch (display_info->bpc) {
 598         case 10:
 599                 video->color_depth = 10;
 600                 break;
 601         case 6:
 602                 video->color_depth = 6;
 603                 break;
 604         default:
 605                 video->color_depth = 8;
 606                 break;
 607         }
 608
 609         video->color_fmt = PXL_RGB;
 610
 611         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 612         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 613
 614         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 615         if (ret < 0) {
 616                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 617                 return;
 618         }
 619
 620         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 621                           (ret) ? "LIT" : "BIG");
 622         state = to_rockchip_crtc_state(encoder->crtc->state);
 623         if (ret) {
 624                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 625                 state->output_mode = ROCKCHIP_OUT_MODE_P888;
 626         } else {
 627                 val = DP_SEL_VOP_LIT << 16;
 628                 state->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 629         }
 630
 631         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 632         if (ret)
 633                 return;
 634
 635         memcpy(&dp->mode, adjusted, sizeof(*mode));
 636 }
 637
 638 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 639 {
 640         u8 link_status[DP_LINK_STATUS_SIZE];
 641         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 642         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 643
 644         if (!port || !dp->link.rate || !dp->link.num_lanes)
 645                 return false;
 646
 647         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 648                              DP_LINK_STATUS_SIZE)) {
 649                 DRM_ERROR("Failed to get link status\n");
 650                 return false;
 651         }
 652
 653         /* if link training is requested we should perform it always */
 654         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 655 }
 656
 657 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 658 {
 659         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 660         int ret;
 661
 662         mutex_lock(&dp->lock);
 663         ret = cdn_dp_enable(dp);
 664         if (ret) {
 665                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 666                               ret);
 667                 goto out;
 668         }
 669         if (!cdn_dp_check_link_status(dp)) {
 670                 ret = cdn_dp_train_link(dp);
 671                 if (ret) {
 672                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 673                         goto out;
 674                 }
 675         }
 676
 677         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 678         if (ret) {
 679                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 680                 goto out;
 681         }
 682
 683         ret = cdn_dp_config_video(dp);
 684         if (ret) {
 685                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 686                 goto out;
 687         }
 688
 689         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 690         if (ret) {
 691                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 692                 goto out;
 693         }
 694 out:
 695         mutex_unlock(&dp->lock);
 696         if (!ret) {
 697 #ifdef CONFIG_SWITCH
 698                 switch_set_state(&dp->switchdev, 1);
 699 #else
 700                 hdmi_event_connect(dp->dev);
 701 #endif
 702         }
 703 }
 704
 705 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 706 {
 707         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 708         int ret;
 709
 710         mutex_lock(&dp->lock);
 711         if (dp->active) {
 712                 ret = cdn_dp_disable(dp);
 713                 if (ret) {
 714                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 715                                       ret);
 716                 }
 717         }
 718         mutex_unlock(&dp->lock);
 719 #ifdef CONFIG_SWITCH
 720         switch_set_state(&dp->switchdev, 0);
 721 #else
 722         hdmi_event_disconnect(dp->dev);
 723 #endif
 724
 725         /*
 726          * In the following 2 cases, we need to run the event_work to re-enable
 727          * the DP:
 728          * 1. If there is not just one port device is connected, and remove one
 729          *    device from a port, the DP will be disabled here, at this case,
 730          *    run the event_work to re-open DP for the other port.
 731          * 2. If re-training or re-config failed, the DP will be disabled here.
 732          *    run the event_work to re-connect it.
 733          */
 734         if (!dp->connected && cdn_dp_connected_port(dp))
 735                 schedule_work(&dp->event_work);
 736 }
 737
 738 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 739                                        struct drm_crtc_state *crtc_state,
 740                                        struct drm_connector_state *conn_state)
 741 {
 742         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 743
 744         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 745         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 746
 747         return 0;
 748 }
 749
 750 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 751         .mode_set = cdn_dp_encoder_mode_set,
 752         .enable = cdn_dp_encoder_enable,
 753         .disable = cdn_dp_encoder_disable,
 754         .atomic_check = cdn_dp_encoder_atomic_check,
 755 };
 756
 757 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
 758         .destroy = drm_encoder_cleanup,
 759 };
 760
 761 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 762 {
 763         struct device *dev = dp->dev;
 764         struct device_node *np = dev->of_node;
 765         struct platform_device *pdev = to_platform_device(dev);
 766         struct resource *res;
 767
 768         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 769         if (IS_ERR(dp->grf)) {
 770                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 771                 return PTR_ERR(dp->grf);
 772         }
 773
 774         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 775         dp->regs = devm_ioremap_resource(dev, res);
 776         if (IS_ERR(dp->regs)) {
 777                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 778                 return PTR_ERR(dp->regs);
 779         }
 780
 781         dp->core_clk = devm_clk_get(dev, "core-clk");
 782         if (IS_ERR(dp->core_clk)) {
 783                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 784                 return PTR_ERR(dp->core_clk);
 785         }
 786
 787         dp->pclk = devm_clk_get(dev, "pclk");
 788         if (IS_ERR(dp->pclk)) {
 789                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 790                 return PTR_ERR(dp->pclk);
 791         }
 792
 793         dp->spdif_clk = devm_clk_get(dev, "spdif");
 794         if (IS_ERR(dp->spdif_clk)) {
 795                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 796                 return PTR_ERR(dp->spdif_clk);
 797         }
 798
 799         dp->grf_clk = devm_clk_get(dev, "grf");
 800         if (IS_ERR(dp->grf_clk)) {
 801                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 802                 return PTR_ERR(dp->grf_clk);
 803         }
 804
 805         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 806         if (IS_ERR(dp->spdif_rst)) {
 807                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 808                 return PTR_ERR(dp->spdif_rst);
 809         }
 810
 811         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 812         if (IS_ERR(dp->dptx_rst)) {
 813                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 814                 return PTR_ERR(dp->dptx_rst);
 815         }
 816
 817         dp->core_rst = devm_reset_control_get(dev, "core");
 818         if (IS_ERR(dp->core_rst)) {
 819                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 820                 return PTR_ERR(dp->core_rst);
 821         }
 822
 823         dp->apb_rst = devm_reset_control_get(dev, "apb");
 824         if (IS_ERR(dp->apb_rst)) {
 825                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 826                 return PTR_ERR(dp->apb_rst);
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 833                                   struct hdmi_codec_daifmt *daifmt,
 834                                   struct hdmi_codec_params *params)
 835 {
 836         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 837         struct audio_info audio = {
 838                 .sample_width = params->sample_width,
 839                 .sample_rate = params->sample_rate,
 840                 .channels = params->channels,
 841         };
 842         int ret;
 843
 844         mutex_lock(&dp->lock);
 845         if (!dp->active) {
 846                 ret = -ENODEV;
 847                 goto out;
 848         }
 849
 850         switch (daifmt->fmt) {
 851         case HDMI_I2S:
 852                 audio.format = AFMT_I2S;
 853                 break;
 854         case HDMI_SPDIF:
 855                 audio.format = AFMT_SPDIF;
 856                 break;
 857         default:
 858                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 859                 ret = -EINVAL;
 860                 goto out;
 861         }
 862
 863         ret = cdn_dp_audio_config(dp, &audio);
 864         if (!ret)
 865                 dp->audio_info = audio;
 866
 867 out:
 868         mutex_unlock(&dp->lock);
 869         return ret;
 870 }
 871
 872 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 873 {
 874         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 875         int ret;
 876
 877         mutex_lock(&dp->lock);
 878         if (!dp->active)
 879                 goto out;
 880
 881         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 882         if (!ret)
 883                 dp->audio_info.format = AFMT_UNUSED;
 884 out:
 885         mutex_unlock(&dp->lock);
 886 }
 887
 888 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
 889                                      bool enable)
 890 {
 891         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 892         int ret;
 893
 894         mutex_lock(&dp->lock);
 895         if (!dp->active) {
 896                 ret = -ENODEV;
 897                 goto out;
 898         }
 899
 900         ret = cdn_dp_audio_mute(dp, enable);
 901
 902 out:
 903         mutex_unlock(&dp->lock);
 904         return ret;
 905 }
 906
 907 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 908                                 u8 *buf, size_t len)
 909 {
 910         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 911
 912         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 913
 914         return 0;
 915 }
 916
 917 static const struct hdmi_codec_ops audio_codec_ops = {
 918         .hw_params = cdn_dp_audio_hw_params,
 919         .audio_shutdown = cdn_dp_audio_shutdown,
 920         .digital_mute = cdn_dp_audio_digital_mute,
 921         .get_eld = cdn_dp_audio_get_eld,
 922 };
 923
 924 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 925                                    struct device *dev)
 926 {
 927         struct hdmi_codec_pdata codec_data = {
 928                 .i2s = 1,
 929                 .spdif = 1,
 930                 .ops = &audio_codec_ops,
 931                 .max_i2s_channels = 8,
 932         };
 933
 934         dp->audio_pdev = platform_device_register_data(
 935                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 936                          &codec_data, sizeof(codec_data));
 937
 938         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 939 }
 940
 941 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 942 {
 943         int ret;
 944         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 945         unsigned long sleep = 1000;
 946
 947         WARN_ON(!mutex_is_locked(&dp->lock));
 948
 949         if (dp->fw_loaded)
 950                 return 0;
 951
 952         /* Drop the lock before getting the firmware to avoid blocking boot */
 953         mutex_unlock(&dp->lock);
 954
 955         while (time_before(jiffies, timeout)) {
 956                 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 957                 if (ret == -ENOENT) {
 958                         msleep(sleep);
 959                         sleep *= 2;
 960                         continue;
 961                 } else if (ret) {
 962                         DRM_DEV_ERROR(dp->dev,
 963                                       "failed to request firmware: %d\n", ret);
 964                         goto out;
 965                 }
 966
 967                 dp->fw_loaded = true;
 968                 ret = 0;
 969                 goto out;
 970         }
 971
 972         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 973         ret = -ETIMEDOUT;
 974 out:
 975         mutex_lock(&dp->lock);
 976         return ret;
 977 }
 978
 979 static void cdn_dp_pd_event_work(struct work_struct *work)
 980 {
 981         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 982                                                 event_work);
 983         struct drm_connector *connector = &dp->connector;
 984         enum drm_connector_status old_status;
 985
 986         int ret;
 987         u8 sink_count;
 988
 989         mutex_lock(&dp->lock);
 990
 991         if (dp->suspended)
 992                 goto out;
 993
 994         ret = cdn_dp_request_firmware(dp);
 995         if (ret)
 996                 goto out;
 997
 998         dp->connected = true;
 999
1000         /* Not connected, notify userspace to disable the block */
1001         if (!cdn_dp_connected_port(dp)) {
1002                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
1003                 dp->connected = false;
1004
1005         /* Connected but not enabled, enable the block */
1006         } else if (!dp->active) {
1007                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
1008                 ret = cdn_dp_enable(dp);
1009                 if (ret) {
1010                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
1011                         dp->connected = false;
1012                 }
1013
1014         /* Enabled and connected to a dongle without a sink, notify userspace */
1015         } else if (cdn_dp_get_sink_count(dp, &sink_count) || !sink_count) {
1016                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
1017                 dp->connected = false;
1018
1019         /* Enabled and connected with a sink, re-train if requested */
1020         } else if (!cdn_dp_check_link_status(dp)) {
1021                 unsigned int rate = dp->link.rate;
1022                 unsigned int lanes = dp->link.num_lanes;
1023                 struct drm_display_mode *mode = &dp->mode;
1024
1025                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
1026                 ret = cdn_dp_train_link(dp);
1027                 if (ret) {
1028                         dp->connected = false;
1029                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
1030                         goto out;
1031                 }
1032
1033                 /* If training result is changed, update the video config */
1034                 if (mode->clock &&
1035                     (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
1036                         ret = cdn_dp_config_video(dp);
1037                         if (ret) {
1038                                 dp->connected = false;
1039                                 DRM_DEV_ERROR(dp->dev,
1040                                               "Failed to config video %d\n",
1041                                               ret);
1042                         }
1043                 }
1044         }
1045
1046 out:
1047         mutex_unlock(&dp->lock);
1048
1049         old_status = connector->status;
1050         connector->status = connector->funcs->detect(connector, false);
1051         if (old_status != connector->status)
1052                 drm_kms_helper_hotplug_event(dp->drm_dev);
1053 }
1054
1055 static int cdn_dp_pd_event(struct notifier_block *nb,
1056                            unsigned long event, void *priv)
1057 {
1058         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1059                                                 event_nb);
1060         struct cdn_dp_device *dp = port->dp;
1061
1062         /*
1063          * It would be nice to be able to just do the work inline right here.
1064          * However, we need to make a bunch of calls that might sleep in order
1065          * to turn on the block/phy, so use a worker instead.
1066          */
1067         schedule_work(&dp->event_work);
1068
1069         return NOTIFY_DONE;
1070 }
1071
1072 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1073 {
1074         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1075         struct drm_encoder *encoder;
1076         struct drm_connector *connector;
1077         struct cdn_dp_port *port;
1078         struct drm_device *drm_dev = data;
1079         int ret, i;
1080
1081         ret = cdn_dp_parse_dt(dp);
1082         if (ret < 0)
1083                 return ret;
1084
1085         dp->drm_dev = drm_dev;
1086         dp->connected = false;
1087         dp->active = false;
1088
1089         mutex_init(&dp->lock);
1090         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1091
1092         encoder = &dp->encoder;
1093
1094         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1095                                                              dev->of_node);
1096         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1097
1098         ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1099                                DRM_MODE_ENCODER_TMDS, NULL);
1100         if (ret) {
1101                 DRM_ERROR("failed to initialize encoder with drm\n");
1102                 return ret;
1103         }
1104
1105         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1106
1107         connector = &dp->connector;
1108         connector->polled = DRM_CONNECTOR_POLL_HPD;
1109         connector->dpms = DRM_MODE_DPMS_OFF;
1110
1111         ret = drm_connector_init(drm_dev, connector,
1112                                  &cdn_dp_atomic_connector_funcs,
1113                                  DRM_MODE_CONNECTOR_DisplayPort);
1114         if (ret) {
1115                 DRM_ERROR("failed to initialize connector with drm\n");
1116                 goto err_free_encoder;
1117         }
1118
1119         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1120
1121 #ifdef CONFIG_SWITCH
1122         dp->switchdev.name = "cdn-dp";
1123         switch_dev_register(&dp->switchdev);
1124 #endif
1125
1126         ret = drm_mode_connector_attach_encoder(connector, encoder);
1127         if (ret) {
1128                 DRM_ERROR("failed to attach connector and encoder\n");
1129                 goto err_free_connector;
1130         }
1131
1132         cdn_dp_audio_codec_init(dp, dev);
1133
1134         for (i = 0; i < dp->ports; i++) {
1135                 port = dp->port[i];
1136
1137                 port->event_nb.notifier_call = cdn_dp_pd_event;
1138                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1139                                                     EXTCON_DISP_DP,
1140                                                     &port->event_nb);
1141                 if (ret) {
1142                         DRM_DEV_ERROR(dev,
1143                                       "register EXTCON_DISP_DP notifier err\n");
1144                         goto err_free_connector;
1145                 }
1146         }
1147
1148         pm_runtime_enable(dev);
1149
1150         schedule_work(&dp->event_work);
1151
1152         return 0;
1153
1154 err_free_connector:
1155         drm_connector_cleanup(connector);
1156 err_free_encoder:
1157         drm_encoder_cleanup(encoder);
1158         return ret;
1159 }
1160
1161 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1162 {
1163         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1164         struct drm_encoder *encoder = &dp->encoder;
1165         struct drm_connector *connector = &dp->connector;
1166
1167 #ifdef CONFIG_SWITCH
1168         switch_dev_unregister(&dp->switchdev);
1169 #endif
1170
1171         cancel_work_sync(&dp->event_work);
1172         platform_device_unregister(dp->audio_pdev);
1173         cdn_dp_encoder_disable(encoder);
1174         encoder->funcs->destroy(encoder);
1175         connector->funcs->destroy(connector);
1176
1177         pm_runtime_disable(dev);
1178         release_firmware(dp->fw);
1179         kfree(dp->edid);
1180         dp->edid = NULL;
1181 }
1182
1183 static const struct component_ops cdn_dp_component_ops = {
1184         .bind = cdn_dp_bind,
1185         .unbind = cdn_dp_unbind,
1186 };
1187
1188 int cdn_dp_suspend(struct device *dev)
1189 {
1190         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1191         int ret = 0;
1192
1193         mutex_lock(&dp->lock);
1194         if (dp->active)
1195                 ret = cdn_dp_disable(dp);
1196         dp->suspended = true;
1197         mutex_unlock(&dp->lock);
1198
1199         return ret;
1200 }
1201
1202 int cdn_dp_resume(struct device *dev)
1203 {
1204         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1205
1206         mutex_lock(&dp->lock);
1207         dp->suspended = false;
1208         if (dp->fw_loaded)
1209                 schedule_work(&dp->event_work);
1210         mutex_unlock(&dp->lock);
1211
1212         return 0;
1213 }
1214
1215 static int cdn_dp_probe(struct platform_device *pdev)
1216 {
1217         struct device *dev = &pdev->dev;
1218         const struct of_device_id *match;
1219         struct cdn_dp_data *dp_data;
1220         struct cdn_dp_port *port;
1221         struct cdn_dp_device *dp;
1222         struct extcon_dev *extcon;
1223         struct phy *phy;
1224         int i;
1225
1226         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1227         if (!dp)
1228                 return -ENOMEM;
1229         dp->dev = dev;
1230
1231         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1232         dp_data = (struct cdn_dp_data *)match->data;
1233
1234         for (i = 0; i < dp_data->max_phy; i++) {
1235                 extcon = extcon_get_edev_by_phandle(dev, i);
1236                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1237
1238                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1239                     PTR_ERR(phy) == -EPROBE_DEFER)
1240                         return -EPROBE_DEFER;
1241
1242                 if (IS_ERR(extcon) || IS_ERR(phy))
1243                         continue;
1244
1245                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1246                 if (!dp)
1247                         return -ENOMEM;
1248
1249                 port->extcon = extcon;
1250                 port->phy = phy;
1251                 port->dp = dp;
1252                 port->id = i;
1253                 dp->port[dp->ports++] = port;
1254         }
1255
1256         if (!dp->ports) {
1257                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1258                 return -EINVAL;
1259         }
1260
1261         dev_set_drvdata(dev, dp);
1262
1263         return component_add(dev, &cdn_dp_component_ops);
1264 }
1265
1266 static int cdn_dp_remove(struct platform_device *pdev)
1267 {
1268         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1269
1270         cdn_dp_suspend(dp->dev);
1271         component_del(&pdev->dev, &cdn_dp_component_ops);
1272
1273         return 0;
1274 }
1275
1276 static void cdn_dp_shutdown(struct platform_device *pdev)
1277 {
1278         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1279
1280         cdn_dp_suspend(dp->dev);
1281 }
1282
1283 static const struct dev_pm_ops cdn_dp_pm_ops = {
1284         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1285                                 cdn_dp_resume)
1286 };
1287
1288 static struct platform_driver cdn_dp_driver = {
1289         .probe = cdn_dp_probe,
1290         .remove = cdn_dp_remove,
1291         .shutdown = cdn_dp_shutdown,
1292         .driver = {
1293                    .name = "cdn-dp",
1294                    .owner = THIS_MODULE,
1295                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1296                    .pm = &cdn_dp_pm_ops,
1297         },
1298 };
1299
1300 module_platform_driver(cdn_dp_driver);
1301
1302 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
1303 MODULE_DESCRIPTION("cdn DP Driver");
1304 MODULE_LICENSE("GPL v2");