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

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author: Chris Zhong <[email protected]>
   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         u32 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: %d\n", rate);
 127                 goto err_set_rate;
 128         }
 129
 130         cdn_dp_set_fw_clk(dp, rate);
 131         cdn_dp_clock_reset(dp);
 132
 133         return 0;
 134
 135 err_set_rate:
 136         pm_runtime_put(dp->dev);
 137 err_pm_runtime_get:
 138         clk_disable_unprepare(dp->core_clk);
 139 err_core_clk:
 140         clk_disable_unprepare(dp->pclk);
 141 err_pclk:
 142         return ret;
 143 }
 144
 145 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 146 {
 147         pm_runtime_put_sync(dp->dev);
 148         clk_disable_unprepare(dp->pclk);
 149         clk_disable_unprepare(dp->core_clk);
 150 }
 151
 152 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 153 {
 154         struct extcon_dev *edev = port->extcon;
 155         union extcon_property_value property;
 156         int dptx;
 157         u8 lanes;
 158
 159         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 160         if (dptx > 0) {
 161                 extcon_get_property(edev, EXTCON_DISP_DP,
 162                                     EXTCON_PROP_USB_SS, &property);
 163                 if (property.intval)
 164                         lanes = 2;
 165                 else
 166                         lanes = 4;
 167         } else {
 168                 lanes = 0;
 169         }
 170
 171         return lanes;
 172 }
 173
 174 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 175 {
 176         int ret;
 177         u8 value;
 178
 179         *sink_count = 0;
 180         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 181         if (ret)
 182                 return ret;
 183
 184         *sink_count = DP_GET_SINK_COUNT(value);
 185         return 0;
 186 }
 187
 188 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 189 {
 190         struct cdn_dp_port *port;
 191         int i, lanes;
 192
 193         for (i = 0; i < dp->ports; i++) {
 194                 port = dp->port[i];
 195                 lanes = cdn_dp_get_port_lanes(port);
 196                 if (lanes)
 197                         return port;
 198         }
 199         return NULL;
 200 }
 201
 202 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
 203 {
 204         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 205         struct cdn_dp_port *port;
 206         u8 sink_count = 0;
 207
 208         if (dp->active_port < 0 || dp->active_port >= dp->ports) {
 209                 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
 210                 return false;
 211         }
 212
 213         port = dp->port[dp->active_port];
 214
 215         /*
 216          * Attempt to read sink count, retry in case the sink may not be ready.
 217          *
 218          * Sinks are *supposed* to come up within 1ms from an off state, but
 219          * some docks need more time to power up.
 220          */
 221         while (time_before(jiffies, timeout)) {
 222                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 223                         return false;
 224
 225                 if (!cdn_dp_get_sink_count(dp, &sink_count))
 226                         return sink_count ? true : false;
 227
 228                 usleep_range(5000, 10000);
 229         }
 230
 231         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 232         return false;
 233 }
 234
 235 static enum drm_connector_status
 236 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 237 {
 238         struct cdn_dp_device *dp = connector_to_dp(connector);
 239         enum drm_connector_status status = connector_status_disconnected;
 240
 241         mutex_lock(&dp->lock);
 242         if (dp->connected)
 243                 status = connector_status_connected;
 244         mutex_unlock(&dp->lock);
 245
 246         return status;
 247 }
 248
 249 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 250 {
 251         drm_connector_unregister(connector);
 252         drm_connector_cleanup(connector);
 253 }
 254
 255 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 256         .dpms = drm_atomic_helper_connector_dpms,
 257         .detect = cdn_dp_connector_detect,
 258         .destroy = cdn_dp_connector_destroy,
 259         .fill_modes = drm_helper_probe_single_connector_modes,
 260         .reset = drm_atomic_helper_connector_reset,
 261         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 262         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 263 };
 264
 265 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 266 {
 267         struct cdn_dp_device *dp = connector_to_dp(connector);
 268         struct edid *edid;
 269         int ret = 0;
 270
 271         mutex_lock(&dp->lock);
 272         edid = dp->edid;
 273         if (edid) {
 274                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 275                                   edid->width_cm, edid->height_cm);
 276
 277                 dp->sink_has_audio = drm_detect_monitor_audio(edid);
 278                 ret = drm_add_edid_modes(connector, edid);
 279                 if (ret) {
 280                         drm_mode_connector_update_edid_property(connector,
 281                                                                 edid);
 282                         drm_edid_to_eld(connector, edid);
 283                 }
 284         }
 285         mutex_unlock(&dp->lock);
 286
 287         return ret;
 288 }
 289
 290 static struct drm_encoder *
 291 cdn_dp_connector_best_encoder(struct drm_connector *connector)
 292 {
 293         struct cdn_dp_device *dp = connector_to_dp(connector);
 294
 295         return &dp->encoder;
 296 }
 297
 298 static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 299                                        struct drm_display_mode *mode)
 300 {
 301         struct cdn_dp_device *dp = connector_to_dp(connector);
 302         struct drm_display_info *display_info = &dp->connector.display_info;
 303         u32 requested, actual, rate, sink_max, source_max = 0;
 304         u8 lanes, bpc;
 305
 306         /* If DP is disconnected, every mode is invalid */
 307         if (!dp->connected)
 308                 return MODE_BAD;
 309
 310         switch (display_info->bpc) {
 311         case 10:
 312                 bpc = 10;
 313                 break;
 314         case 6:
 315                 bpc = 6;
 316                 break;
 317         default:
 318                 bpc = 8;
 319                 break;
 320         }
 321
 322         requested = mode->clock * bpc * 3 / 1000;
 323
 324         source_max = dp->lanes;
 325         sink_max = drm_dp_max_lane_count(dp->dpcd);
 326         lanes = min(source_max, sink_max);
 327
 328         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 329         sink_max = drm_dp_max_link_rate(dp->dpcd);
 330         rate = min(source_max, sink_max);
 331
 332         actual = rate * lanes / 100;
 333
 334         /* efficiency is about 0.8 */
 335         actual = actual * 8 / 10;
 336
 337         if (requested > actual) {
 338                 DRM_DEV_DEBUG_KMS(dp->dev,
 339                                   "requested=%d, actual=%d, clock=%d\n",
 340                                   requested, actual, mode->clock);
 341                 return MODE_CLOCK_HIGH;
 342         }
 343
 344         return MODE_OK;
 345 }
 346
 347 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 348         .get_modes = cdn_dp_connector_get_modes,
 349         .best_encoder = cdn_dp_connector_best_encoder,
 350         .mode_valid = cdn_dp_connector_mode_valid,
 351 };
 352
 353 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 354 {
 355         int ret;
 356         const u32 *iram_data, *dram_data;
 357         const struct firmware *fw = dp->fw;
 358         const struct cdn_firmware_header *hdr;
 359
 360         hdr = (struct cdn_firmware_header *)fw->data;
 361         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 362                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 363                 return -EINVAL;
 364         }
 365
 366         iram_data = (const u32 *)(fw->data + hdr->header_size);
 367         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 368
 369         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 370                                    dram_data, hdr->dram_size);
 371         if (ret)
 372                 return ret;
 373
 374         ret = cdn_dp_set_firmware_active(dp, true);
 375         if (ret) {
 376                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 377                 return ret;
 378         }
 379
 380         return cdn_dp_event_config(dp);
 381 }
 382
 383 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 384 {
 385         int ret;
 386
 387         if (!cdn_dp_check_sink_connection(dp))
 388                 return -ENODEV;
 389
 390         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 391                                DP_RECEIVER_CAP_SIZE);
 392         if (ret) {
 393                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 394                 return ret;
 395         }
 396
 397         kfree(dp->edid);
 398         dp->edid = drm_do_get_edid(&dp->connector,
 399                                    cdn_dp_get_edid_block, dp);
 400         return 0;
 401 }
 402
 403 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 404 {
 405         union extcon_property_value property;
 406         int ret;
 407
 408         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 409                                (port->id << UPHY_SEL_BIT) | UPHY_SEL_MASK);
 410         if (ret)
 411                 return ret;
 412
 413         if (!port->phy_enabled) {
 414                 ret = phy_power_on(port->phy);
 415                 if (ret) {
 416                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 417                                       ret);
 418                         goto err_phy;
 419                 }
 420                 port->phy_enabled = true;
 421         }
 422
 423         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 424                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 425         if (ret) {
 426                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 427                 goto err_power_on;
 428         }
 429
 430         ret = cdn_dp_get_hpd_status(dp);
 431         if (ret <= 0) {
 432                 if (!ret)
 433                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 434                 goto err_power_on;
 435         }
 436
 437         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 438                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 439         if (ret) {
 440                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 441                 goto err_power_on;
 442         }
 443
 444         port->lanes = cdn_dp_get_port_lanes(port);
 445         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 446         if (ret) {
 447                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 448                               ret);
 449                 goto err_power_on;
 450         }
 451
 452         dp->active_port = port->id;
 453         return 0;
 454
 455 err_power_on:
 456         if (phy_power_off(port->phy))
 457                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 458         else
 459                 port->phy_enabled = false;
 460
 461 err_phy:
 462         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 463                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 464         return ret;
 465 }
 466
 467 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 468                               struct cdn_dp_port *port)
 469 {
 470         int ret;
 471
 472         if (port->phy_enabled) {
 473                 ret = phy_power_off(port->phy);
 474                 if (ret) {
 475                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 476                         return ret;
 477                 }
 478         }
 479
 480         port->phy_enabled = false;
 481         port->lanes = 0;
 482         dp->active_port = -1;
 483         return 0;
 484 }
 485
 486 static int cdn_dp_disable(struct cdn_dp_device *dp)
 487 {
 488         int ret, i;
 489
 490         if (!dp->active)
 491                 return 0;
 492
 493         for (i = 0; i < dp->ports; i++)
 494                 cdn_dp_disable_phy(dp, dp->port[i]);
 495
 496         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 497                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 498         if (ret) {
 499                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 500                               ret);
 501                 return ret;
 502         }
 503
 504         cdn_dp_set_firmware_active(dp, false);
 505         cdn_dp_clk_disable(dp);
 506         dp->active = false;
 507         dp->link.rate = 0;
 508         dp->link.num_lanes = 0;
 509         if (!dp->connected) {
 510                 kfree(dp->edid);
 511                 dp->edid = NULL;
 512         }
 513
 514         return 0;
 515 }
 516
 517 static int cdn_dp_enable(struct cdn_dp_device *dp)
 518 {
 519         int ret, i, lanes;
 520         struct cdn_dp_port *port;
 521
 522         port = cdn_dp_connected_port(dp);
 523         if (!port) {
 524                 DRM_DEV_ERROR(dp->dev,
 525                               "Can't enable without connection\n");
 526                 return -ENODEV;
 527         }
 528
 529         if (dp->active)
 530                 return 0;
 531
 532         ret = cdn_dp_clk_enable(dp);
 533         if (ret)
 534                 return ret;
 535
 536         ret = cdn_dp_firmware_init(dp);
 537         if (ret) {
 538                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 539                 goto err_clk_disable;
 540         }
 541
 542         /* only enable the port that connected with downstream device */
 543         for (i = port->id; i < dp->ports; i++) {
 544                 port = dp->port[i];
 545                 lanes = cdn_dp_get_port_lanes(port);
 546                 if (lanes) {
 547                         ret = cdn_dp_enable_phy(dp, port);
 548                         if (ret)
 549                                 continue;
 550
 551                         ret = cdn_dp_get_sink_capability(dp);
 552                         if (ret) {
 553                                 cdn_dp_disable_phy(dp, port);
 554                         } else {
 555                                 dp->active = true;
 556                                 dp->lanes = port->lanes;
 557                                 return 0;
 558                         }
 559                 }
 560         }
 561
 562 err_clk_disable:
 563         cdn_dp_clk_disable(dp);
 564         return ret;
 565 }
 566
 567 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 568                                     struct drm_display_mode *mode,
 569                                     struct drm_display_mode *adjusted)
 570 {
 571         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 572         struct drm_display_info *display_info = &dp->connector.display_info;
 573         struct video_info *video = &dp->video_info;
 574
 575         switch (display_info->bpc) {
 576         case 10:
 577                 video->color_depth = 10;
 578                 break;
 579         case 6:
 580                 video->color_depth = 6;
 581                 break;
 582         default:
 583                 video->color_depth = 8;
 584                 break;
 585         }
 586
 587         video->color_fmt = PXL_RGB;
 588         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 589         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 590
 591         memcpy(&dp->mode, adjusted, sizeof(*mode));
 592 }
 593
 594 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 595 {
 596         u8 link_status[DP_LINK_STATUS_SIZE];
 597         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 598         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 599
 600         if (!port || !dp->link.rate || !dp->link.num_lanes)
 601                 return false;
 602
 603         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 604                              DP_LINK_STATUS_SIZE)) {
 605                 DRM_ERROR("Failed to get link status\n");
 606                 return false;
 607         }
 608
 609         /* if link training is requested we should perform it always */
 610         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 611 }
 612
 613 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 614 {
 615         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 616         int ret, val;
 617         struct rockchip_crtc_state *state;
 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         state = to_rockchip_crtc_state(encoder->crtc->state);
 628         if (ret) {
 629                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 630                 state->output_mode = ROCKCHIP_OUT_MODE_P888;
 631         } else {
 632                 val = DP_SEL_VOP_LIT << 16;
 633                 state->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 634         }
 635
 636         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 637         if (ret)
 638                 return;
 639
 640         mutex_lock(&dp->lock);
 641
 642         ret = cdn_dp_enable(dp);
 643         if (ret) {
 644                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 645                               ret);
 646                 goto out;
 647         }
 648         if (!cdn_dp_check_link_status(dp)) {
 649                 ret = cdn_dp_train_link(dp);
 650                 if (ret) {
 651                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 652                         goto out;
 653                 }
 654         }
 655
 656         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 657         if (ret) {
 658                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 659                 goto out;
 660         }
 661
 662         ret = cdn_dp_config_video(dp);
 663         if (ret) {
 664                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 665                 goto out;
 666         }
 667
 668         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 669         if (ret) {
 670                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 671                 goto out;
 672         }
 673 out:
 674         mutex_unlock(&dp->lock);
 675 }
 676
 677 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 678 {
 679         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 680         int ret;
 681
 682         mutex_lock(&dp->lock);
 683         if (dp->active) {
 684                 ret = cdn_dp_disable(dp);
 685                 if (ret) {
 686                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 687                                       ret);
 688                 }
 689         }
 690         mutex_unlock(&dp->lock);
 691
 692         /*
 693          * In the following 2 cases, we need to run the event_work to re-enable
 694          * the DP:
 695          * 1. If there is not just one port device is connected, and remove one
 696          *    device from a port, the DP will be disabled here, at this case,
 697          *    run the event_work to re-open DP for the other port.
 698          * 2. If re-training or re-config failed, the DP will be disabled here.
 699          *    run the event_work to re-connect it.
 700          */
 701         if (!dp->connected && cdn_dp_connected_port(dp))
 702                 schedule_work(&dp->event_work);
 703 }
 704
 705 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 706                                        struct drm_crtc_state *crtc_state,
 707                                        struct drm_connector_state *conn_state)
 708 {
 709         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 710
 711         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 712         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 713
 714         return 0;
 715 }
 716
 717 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 718         .mode_set = cdn_dp_encoder_mode_set,
 719         .enable = cdn_dp_encoder_enable,
 720         .disable = cdn_dp_encoder_disable,
 721         .atomic_check = cdn_dp_encoder_atomic_check,
 722 };
 723
 724 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
 725         .destroy = drm_encoder_cleanup,
 726 };
 727
 728 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 729 {
 730         struct device *dev = dp->dev;
 731         struct device_node *np = dev->of_node;
 732         struct platform_device *pdev = to_platform_device(dev);
 733         struct resource *res;
 734
 735         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 736         if (IS_ERR(dp->grf)) {
 737                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 738                 return PTR_ERR(dp->grf);
 739         }
 740
 741         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 742         dp->regs = devm_ioremap_resource(dev, res);
 743         if (IS_ERR(dp->regs)) {
 744                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 745                 return PTR_ERR(dp->regs);
 746         }
 747
 748         dp->core_clk = devm_clk_get(dev, "core-clk");
 749         if (IS_ERR(dp->core_clk)) {
 750                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 751                 return PTR_ERR(dp->core_clk);
 752         }
 753
 754         dp->pclk = devm_clk_get(dev, "pclk");
 755         if (IS_ERR(dp->pclk)) {
 756                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 757                 return PTR_ERR(dp->pclk);
 758         }
 759
 760         dp->spdif_clk = devm_clk_get(dev, "spdif");
 761         if (IS_ERR(dp->spdif_clk)) {
 762                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 763                 return PTR_ERR(dp->spdif_clk);
 764         }
 765
 766         dp->grf_clk = devm_clk_get(dev, "grf");
 767         if (IS_ERR(dp->grf_clk)) {
 768                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 769                 return PTR_ERR(dp->grf_clk);
 770         }
 771
 772         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 773         if (IS_ERR(dp->spdif_rst)) {
 774                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 775                 return PTR_ERR(dp->spdif_rst);
 776         }
 777
 778         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 779         if (IS_ERR(dp->dptx_rst)) {
 780                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 781                 return PTR_ERR(dp->dptx_rst);
 782         }
 783
 784         dp->core_rst = devm_reset_control_get(dev, "core");
 785         if (IS_ERR(dp->core_rst)) {
 786                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 787                 return PTR_ERR(dp->core_rst);
 788         }
 789
 790         dp->apb_rst = devm_reset_control_get(dev, "apb");
 791         if (IS_ERR(dp->apb_rst)) {
 792                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 793                 return PTR_ERR(dp->apb_rst);
 794         }
 795
 796         return 0;
 797 }
 798
 799 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 800                                   struct hdmi_codec_daifmt *daifmt,
 801                                   struct hdmi_codec_params *params)
 802 {
 803         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 804         struct audio_info audio = {
 805                 .sample_width = params->sample_width,
 806                 .sample_rate = params->sample_rate,
 807                 .channels = params->channels,
 808         };
 809         int ret;
 810
 811         mutex_lock(&dp->lock);
 812         if (!dp->active) {
 813                 ret = -ENODEV;
 814                 goto out;
 815         }
 816
 817         switch (daifmt->fmt) {
 818         case HDMI_I2S:
 819                 audio.format = AFMT_I2S;
 820                 break;
 821         case HDMI_SPDIF:
 822                 audio.format = AFMT_SPDIF;
 823                 break;
 824         default:
 825                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 826                 ret = -EINVAL;
 827                 goto out;
 828         }
 829
 830         ret = cdn_dp_audio_config(dp, &audio);
 831         if (!ret)
 832                 dp->audio_info = audio;
 833
 834 out:
 835         mutex_unlock(&dp->lock);
 836         return ret;
 837 }
 838
 839 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 840 {
 841         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 842         int ret;
 843
 844         mutex_lock(&dp->lock);
 845         if (!dp->active)
 846                 goto out;
 847
 848         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 849         if (!ret)
 850                 dp->audio_info.format = AFMT_UNUSED;
 851 out:
 852         mutex_unlock(&dp->lock);
 853 }
 854
 855 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
 856                                      bool enable)
 857 {
 858         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 859         int ret;
 860
 861         mutex_lock(&dp->lock);
 862         if (!dp->active) {
 863                 ret = -ENODEV;
 864                 goto out;
 865         }
 866
 867         ret = cdn_dp_audio_mute(dp, enable);
 868
 869 out:
 870         mutex_unlock(&dp->lock);
 871         return ret;
 872 }
 873
 874 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 875                                 u8 *buf, size_t len)
 876 {
 877         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 878
 879         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 880
 881         return 0;
 882 }
 883
 884 static const struct hdmi_codec_ops audio_codec_ops = {
 885         .hw_params = cdn_dp_audio_hw_params,
 886         .audio_shutdown = cdn_dp_audio_shutdown,
 887         .digital_mute = cdn_dp_audio_digital_mute,
 888         .get_eld = cdn_dp_audio_get_eld,
 889 };
 890
 891 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 892                                    struct device *dev)
 893 {
 894         struct hdmi_codec_pdata codec_data = {
 895                 .i2s = 1,
 896                 .spdif = 1,
 897                 .ops = &audio_codec_ops,
 898                 .max_i2s_channels = 8,
 899         };
 900
 901         dp->audio_pdev = platform_device_register_data(
 902                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 903                          &codec_data, sizeof(codec_data));
 904
 905         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 906 }
 907
 908 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 909 {
 910         int ret;
 911         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 912         unsigned long sleep = 1000;
 913
 914         WARN_ON(!mutex_is_locked(&dp->lock));
 915
 916         if (dp->fw_loaded)
 917                 return 0;
 918
 919         /* Drop the lock before getting the firmware to avoid blocking boot */
 920         mutex_unlock(&dp->lock);
 921
 922         while (time_before(jiffies, timeout)) {
 923                 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 924                 if (ret == -ENOENT) {
 925                         msleep(sleep);
 926                         sleep *= 2;
 927                         continue;
 928                 } else if (ret) {
 929                         DRM_DEV_ERROR(dp->dev,
 930                                       "failed to request firmware: %d\n", ret);
 931                         goto out;
 932                 }
 933
 934                 dp->fw_loaded = true;
 935                 ret = 0;
 936                 goto out;
 937         }
 938
 939         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 940         ret = -ETIMEDOUT;
 941 out:
 942         mutex_lock(&dp->lock);
 943         return ret;
 944 }
 945
 946 static void cdn_dp_pd_event_work(struct work_struct *work)
 947 {
 948         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 949                                                 event_work);
 950         struct drm_connector *connector = &dp->connector;
 951         enum drm_connector_status old_status;
 952
 953         int ret;
 954
 955         mutex_lock(&dp->lock);
 956
 957         if (dp->suspended)
 958                 goto out;
 959
 960         ret = cdn_dp_request_firmware(dp);
 961         if (ret)
 962                 goto out;
 963
 964         dp->connected = true;
 965
 966         /* Not connected, notify userspace to disable the block */
 967         if (!cdn_dp_connected_port(dp)) {
 968                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
 969                 dp->connected = false;
 970
 971         /* Connected but not enabled, enable the block */
 972         } else if (!dp->active) {
 973                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
 974                 ret = cdn_dp_enable(dp);
 975                 if (ret) {
 976                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
 977                         dp->connected = false;
 978                 }
 979
 980         /* Enabled and connected to a dongle without a sink, notify userspace */
 981         } else if (!cdn_dp_check_sink_connection(dp)) {
 982                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
 983                 dp->connected = false;
 984
 985         /* Enabled and connected with a sink, re-train if requested */
 986         } else if (!cdn_dp_check_link_status(dp)) {
 987                 unsigned int rate = dp->link.rate;
 988                 unsigned int lanes = dp->link.num_lanes;
 989                 struct drm_display_mode *mode = &dp->mode;
 990
 991                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
 992                 ret = cdn_dp_train_link(dp);
 993                 if (ret) {
 994                         dp->connected = false;
 995                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
 996                         goto out;
 997                 }
 998
 999                 /* If training result is changed, update the video config */
1000                 if (mode->clock &&
1001                     (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
1002                         ret = cdn_dp_config_video(dp);
1003                         if (ret) {
1004                                 dp->connected = false;
1005                                 DRM_DEV_ERROR(dp->dev,
1006                                               "Failed to config video %d\n",
1007                                               ret);
1008                         }
1009                 }
1010         }
1011
1012 out:
1013         mutex_unlock(&dp->lock);
1014
1015         old_status = connector->status;
1016         connector->status = connector->funcs->detect(connector, false);
1017         if (old_status != connector->status)
1018                 drm_kms_helper_hotplug_event(dp->drm_dev);
1019 }
1020
1021 static int cdn_dp_pd_event(struct notifier_block *nb,
1022                            unsigned long event, void *priv)
1023 {
1024         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1025                                                 event_nb);
1026         struct cdn_dp_device *dp = port->dp;
1027
1028         /*
1029          * It would be nice to be able to just do the work inline right here.
1030          * However, we need to make a bunch of calls that might sleep in order
1031          * to turn on the block/phy, so use a worker instead.
1032          */
1033         schedule_work(&dp->event_work);
1034
1035         return NOTIFY_DONE;
1036 }
1037
1038 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1039 {
1040         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1041         struct drm_encoder *encoder;
1042         struct drm_connector *connector;
1043         struct cdn_dp_port *port;
1044         struct drm_device *drm_dev = data;
1045         int ret, i;
1046
1047         ret = cdn_dp_parse_dt(dp);
1048         if (ret < 0)
1049                 return ret;
1050
1051         dp->drm_dev = drm_dev;
1052         dp->connected = false;
1053         dp->active = false;
1054         dp->active_port = -1;
1055
1056         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1057
1058         encoder = &dp->encoder;
1059
1060         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1061                                                              dev->of_node);
1062         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1063
1064         ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1065                                DRM_MODE_ENCODER_TMDS, NULL);
1066         if (ret) {
1067                 DRM_ERROR("failed to initialize encoder with drm\n");
1068                 return ret;
1069         }
1070
1071         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1072
1073         connector = &dp->connector;
1074         connector->polled = DRM_CONNECTOR_POLL_HPD;
1075         connector->dpms = DRM_MODE_DPMS_OFF;
1076
1077         ret = drm_connector_init(drm_dev, connector,
1078                                  &cdn_dp_atomic_connector_funcs,
1079                                  DRM_MODE_CONNECTOR_DisplayPort);
1080         if (ret) {
1081                 DRM_ERROR("failed to initialize connector with drm\n");
1082                 goto err_free_encoder;
1083         }
1084
1085         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1086
1087         ret = drm_mode_connector_attach_encoder(connector, encoder);
1088         if (ret) {
1089                 DRM_ERROR("failed to attach connector and encoder\n");
1090                 goto err_free_connector;
1091         }
1092
1093         cdn_dp_audio_codec_init(dp, dev);
1094
1095         for (i = 0; i < dp->ports; i++) {
1096                 port = dp->port[i];
1097
1098                 port->event_nb.notifier_call = cdn_dp_pd_event;
1099                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1100                                                     EXTCON_DISP_DP,
1101                                                     &port->event_nb);
1102                 if (ret) {
1103                         DRM_DEV_ERROR(dev,
1104                                       "register EXTCON_DISP_DP notifier err\n");
1105                         goto err_free_connector;
1106                 }
1107         }
1108
1109         pm_runtime_enable(dev);
1110
1111         schedule_work(&dp->event_work);
1112
1113         return 0;
1114
1115 err_free_connector:
1116         drm_connector_cleanup(connector);
1117 err_free_encoder:
1118         drm_encoder_cleanup(encoder);
1119         return ret;
1120 }
1121
1122 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1123 {
1124         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1125         struct drm_encoder *encoder = &dp->encoder;
1126         struct drm_connector *connector = &dp->connector;
1127
1128         cancel_work_sync(&dp->event_work);
1129         platform_device_unregister(dp->audio_pdev);
1130         cdn_dp_encoder_disable(encoder);
1131         encoder->funcs->destroy(encoder);
1132         connector->funcs->destroy(connector);
1133
1134         pm_runtime_disable(dev);
1135         release_firmware(dp->fw);
1136         kfree(dp->edid);
1137         dp->edid = NULL;
1138 }
1139
1140 static const struct component_ops cdn_dp_component_ops = {
1141         .bind = cdn_dp_bind,
1142         .unbind = cdn_dp_unbind,
1143 };
1144
1145 int cdn_dp_suspend(struct device *dev)
1146 {
1147         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1148         int ret = 0;
1149
1150         mutex_lock(&dp->lock);
1151         if (dp->active)
1152                 ret = cdn_dp_disable(dp);
1153         dp->suspended = true;
1154         mutex_unlock(&dp->lock);
1155
1156         return ret;
1157 }
1158
1159 int cdn_dp_resume(struct device *dev)
1160 {
1161         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1162
1163         mutex_lock(&dp->lock);
1164         dp->suspended = false;
1165         if (dp->fw_loaded)
1166                 schedule_work(&dp->event_work);
1167         mutex_unlock(&dp->lock);
1168
1169         return 0;
1170 }
1171
1172 static int cdn_dp_probe(struct platform_device *pdev)
1173 {
1174         struct device *dev = &pdev->dev;
1175         const struct of_device_id *match;
1176         struct cdn_dp_data *dp_data;
1177         struct cdn_dp_port *port;
1178         struct cdn_dp_device *dp;
1179         struct extcon_dev *extcon;
1180         struct phy *phy;
1181         int i;
1182
1183         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1184         if (!dp)
1185                 return -ENOMEM;
1186         dp->dev = dev;
1187
1188         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1189         dp_data = (struct cdn_dp_data *)match->data;
1190
1191         for (i = 0; i < dp_data->max_phy; i++) {
1192                 extcon = extcon_get_edev_by_phandle(dev, i);
1193                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1194
1195                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1196                     PTR_ERR(phy) == -EPROBE_DEFER)
1197                         return -EPROBE_DEFER;
1198
1199                 if (IS_ERR(extcon) || IS_ERR(phy))
1200                         continue;
1201
1202                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1203                 if (!dp)
1204                         return -ENOMEM;
1205
1206                 port->extcon = extcon;
1207                 port->phy = phy;
1208                 port->dp = dp;
1209                 port->id = i;
1210                 dp->port[dp->ports++] = port;
1211         }
1212
1213         if (!dp->ports) {
1214                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1215                 return -EINVAL;
1216         }
1217
1218         mutex_init(&dp->lock);
1219         dev_set_drvdata(dev, dp);
1220
1221         return component_add(dev, &cdn_dp_component_ops);
1222 }
1223
1224 static int cdn_dp_remove(struct platform_device *pdev)
1225 {
1226         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1227
1228         cdn_dp_suspend(dp->dev);
1229         component_del(&pdev->dev, &cdn_dp_component_ops);
1230
1231         return 0;
1232 }
1233
1234 static void cdn_dp_shutdown(struct platform_device *pdev)
1235 {
1236         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1237
1238         cdn_dp_suspend(dp->dev);
1239 }
1240
1241 static const struct dev_pm_ops cdn_dp_pm_ops = {
1242         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1243                                 cdn_dp_resume)
1244 };
1245
1246 static struct platform_driver cdn_dp_driver = {
1247         .probe = cdn_dp_probe,
1248         .remove = cdn_dp_remove,
1249         .shutdown = cdn_dp_shutdown,
1250         .driver = {
1251                    .name = "cdn-dp",
1252                    .owner = THIS_MODULE,
1253                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1254                    .pm = &cdn_dp_pm_ops,
1255         },
1256 };
1257
1258 module_platform_driver(cdn_dp_driver);
1259
1260 MODULE_AUTHOR("Chris Zhong <[email protected]>");
1261 MODULE_DESCRIPTION("cdn DP Driver");
1262 MODULE_LICENSE("GPL v2");