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