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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   4  * Author: Chris Zhong <zyw@rock-chips.com>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/component.h>
   9 #include <linux/extcon.h>
  10 #include <linux/firmware.h>
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/phy/phy.h>
  13 #include <linux/regmap.h>
  14 #include <linux/reset.h>
  15
  16 #include <sound/hdmi-codec.h>
  17
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_dp_helper.h>
  20 #include <drm/drm_edid.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_probe_helper.h>
  23 #include <drm/drm_simple_kms_helper.h>
  24
  25 #include "cdn-dp-core.h"
  26 #include "cdn-dp-reg.h"
  27 #include "rockchip_drm_vop.h"
  28
  29 #define connector_to_dp(c) \
  30                 container_of(c, struct cdn_dp_device, connector)
  31
  32 #define encoder_to_dp(c) \
  33                 container_of(c, struct cdn_dp_device, encoder)
  34
  35 #define GRF_SOC_CON9            0x6224
  36 #define DP_SEL_VOP_LIT          BIT(12)
  37 #define GRF_SOC_CON26           0x6268
  38 #define DPTX_HPD_SEL            (3 << 12)
  39 #define DPTX_HPD_DEL            (2 << 12)
  40 #define DPTX_HPD_SEL_MASK       (3 << 28)
  41
  42 #define CDN_FW_TIMEOUT_MS       (64 * 1000)
  43 #define CDN_DPCD_TIMEOUT_MS     5000
  44 #define CDN_DP_FIRMWARE         "rockchip/dptx.bin"
  45
  46 struct cdn_dp_data {
  47         u8 max_phy;
  48 };
  49
  50 struct cdn_dp_data rk3399_cdn_dp = {
  51         .max_phy = 2,
  52 };
  53
  54 static const struct of_device_id cdn_dp_dt_ids[] = {
  55         { .compatible = "rockchip,rk3399-cdn-dp",
  56                 .data = (void *)&rk3399_cdn_dp },
  57         {}
  58 };
  59
  60 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
  61
  62 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
  63                             unsigned int reg, unsigned int val)
  64 {
  65         int ret;
  66
  67         ret = clk_prepare_enable(dp->grf_clk);
  68         if (ret) {
  69                 DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
  70                 return ret;
  71         }
  72
  73         ret = regmap_write(dp->grf, reg, val);
  74         if (ret) {
  75                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
  76                 return ret;
  77         }
  78
  79         clk_disable_unprepare(dp->grf_clk);
  80
  81         return 0;
  82 }
  83
  84 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
  85 {
  86         int ret;
  87         unsigned long rate;
  88
  89         ret = clk_prepare_enable(dp->pclk);
  90         if (ret < 0) {
  91                 DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
  92                 goto err_pclk;
  93         }
  94
  95         ret = clk_prepare_enable(dp->core_clk);
  96         if (ret < 0) {
  97                 DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
  98                 goto err_core_clk;
  99         }
 100
 101         ret = pm_runtime_get_sync(dp->dev);
 102         if (ret < 0) {
 103                 DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 104                 goto err_pm_runtime_get;
 105         }
 106
 107         reset_control_assert(dp->core_rst);
 108         reset_control_assert(dp->dptx_rst);
 109         reset_control_assert(dp->apb_rst);
 110         reset_control_deassert(dp->core_rst);
 111         reset_control_deassert(dp->dptx_rst);
 112         reset_control_deassert(dp->apb_rst);
 113
 114         rate = clk_get_rate(dp->core_clk);
 115         if (!rate) {
 116                 DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
 117                 ret = -EINVAL;
 118                 goto err_set_rate;
 119         }
 120
 121         cdn_dp_set_fw_clk(dp, rate);
 122         cdn_dp_clock_reset(dp);
 123
 124         return 0;
 125
 126 err_set_rate:
 127         pm_runtime_put(dp->dev);
 128 err_pm_runtime_get:
 129         clk_disable_unprepare(dp->core_clk);
 130 err_core_clk:
 131         clk_disable_unprepare(dp->pclk);
 132 err_pclk:
 133         return ret;
 134 }
 135
 136 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
 137 {
 138         pm_runtime_put_sync(dp->dev);
 139         clk_disable_unprepare(dp->pclk);
 140         clk_disable_unprepare(dp->core_clk);
 141 }
 142
 143 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
 144 {
 145         struct extcon_dev *edev = port->extcon;
 146         union extcon_property_value property;
 147         int dptx;
 148         u8 lanes;
 149
 150         dptx = extcon_get_state(edev, EXTCON_DISP_DP);
 151         if (dptx > 0) {
 152                 extcon_get_property(edev, EXTCON_DISP_DP,
 153                                     EXTCON_PROP_USB_SS, &property);
 154                 if (property.intval)
 155                         lanes = 2;
 156                 else
 157                         lanes = 4;
 158         } else {
 159                 lanes = 0;
 160         }
 161
 162         return lanes;
 163 }
 164
 165 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
 166 {
 167         int ret;
 168         u8 value;
 169
 170         *sink_count = 0;
 171         ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
 172         if (ret)
 173                 return ret;
 174
 175         *sink_count = DP_GET_SINK_COUNT(value);
 176         return 0;
 177 }
 178
 179 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
 180 {
 181         struct cdn_dp_port *port;
 182         int i, lanes;
 183
 184         for (i = 0; i < dp->ports; i++) {
 185                 port = dp->port[i];
 186                 lanes = cdn_dp_get_port_lanes(port);
 187                 if (lanes)
 188                         return port;
 189         }
 190         return NULL;
 191 }
 192
 193 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
 194 {
 195         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
 196         struct cdn_dp_port *port;
 197         u8 sink_count = 0;
 198
 199         if (dp->active_port < 0 || dp->active_port >= dp->ports) {
 200                 DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
 201                 return false;
 202         }
 203
 204         port = dp->port[dp->active_port];
 205
 206         /*
 207          * Attempt to read sink count, retry in case the sink may not be ready.
 208          *
 209          * Sinks are *supposed* to come up within 1ms from an off state, but
 210          * some docks need more time to power up.
 211          */
 212         while (time_before(jiffies, timeout)) {
 213                 if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
 214                         return false;
 215
 216                 if (!cdn_dp_get_sink_count(dp, &sink_count))
 217                         return sink_count ? true : false;
 218
 219                 usleep_range(5000, 10000);
 220         }
 221
 222         DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
 223         return false;
 224 }
 225
 226 static enum drm_connector_status
 227 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
 228 {
 229         struct cdn_dp_device *dp = connector_to_dp(connector);
 230         enum drm_connector_status status = connector_status_disconnected;
 231
 232         mutex_lock(&dp->lock);
 233         if (dp->connected)
 234                 status = connector_status_connected;
 235         mutex_unlock(&dp->lock);
 236
 237         return status;
 238 }
 239
 240 static void cdn_dp_connector_destroy(struct drm_connector *connector)
 241 {
 242         drm_connector_unregister(connector);
 243         drm_connector_cleanup(connector);
 244 }
 245
 246 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
 247         .detect = cdn_dp_connector_detect,
 248         .destroy = cdn_dp_connector_destroy,
 249         .fill_modes = drm_helper_probe_single_connector_modes,
 250         .reset = drm_atomic_helper_connector_reset,
 251         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 252         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 253 };
 254
 255 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
 256 {
 257         struct cdn_dp_device *dp = connector_to_dp(connector);
 258         struct edid *edid;
 259         int ret = 0;
 260
 261         mutex_lock(&dp->lock);
 262         edid = dp->edid;
 263         if (edid) {
 264                 DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
 265                                   edid->width_cm, edid->height_cm);
 266
 267                 dp->sink_has_audio = drm_detect_monitor_audio(edid);
 268                 ret = drm_add_edid_modes(connector, edid);
 269                 if (ret)
 270                         drm_connector_update_edid_property(connector,
 271                                                                 edid);
 272         }
 273         mutex_unlock(&dp->lock);
 274
 275         return ret;
 276 }
 277
 278 static int cdn_dp_connector_mode_valid(struct drm_connector *connector,
 279                                        struct drm_display_mode *mode)
 280 {
 281         struct cdn_dp_device *dp = connector_to_dp(connector);
 282         struct drm_display_info *display_info = &dp->connector.display_info;
 283         u32 requested, actual, rate, sink_max, source_max = 0;
 284         u8 lanes, bpc;
 285
 286         /* If DP is disconnected, every mode is invalid */
 287         if (!dp->connected)
 288                 return MODE_BAD;
 289
 290         switch (display_info->bpc) {
 291         case 10:
 292                 bpc = 10;
 293                 break;
 294         case 6:
 295                 bpc = 6;
 296                 break;
 297         default:
 298                 bpc = 8;
 299                 break;
 300         }
 301
 302         requested = mode->clock * bpc * 3 / 1000;
 303
 304         source_max = dp->lanes;
 305         sink_max = drm_dp_max_lane_count(dp->dpcd);
 306         lanes = min(source_max, sink_max);
 307
 308         source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
 309         sink_max = drm_dp_max_link_rate(dp->dpcd);
 310         rate = min(source_max, sink_max);
 311
 312         actual = rate * lanes / 100;
 313
 314         /* efficiency is about 0.8 */
 315         actual = actual * 8 / 10;
 316
 317         if (requested > actual) {
 318                 DRM_DEV_DEBUG_KMS(dp->dev,
 319                                   "requested=%d, actual=%d, clock=%d\n",
 320                                   requested, actual, mode->clock);
 321                 return MODE_CLOCK_HIGH;
 322         }
 323
 324         return MODE_OK;
 325 }
 326
 327 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
 328         .get_modes = cdn_dp_connector_get_modes,
 329         .mode_valid = cdn_dp_connector_mode_valid,
 330 };
 331
 332 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
 333 {
 334         int ret;
 335         const u32 *iram_data, *dram_data;
 336         const struct firmware *fw = dp->fw;
 337         const struct cdn_firmware_header *hdr;
 338
 339         hdr = (struct cdn_firmware_header *)fw->data;
 340         if (fw->size != le32_to_cpu(hdr->size_bytes)) {
 341                 DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
 342                 return -EINVAL;
 343         }
 344
 345         iram_data = (const u32 *)(fw->data + hdr->header_size);
 346         dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
 347
 348         ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
 349                                    dram_data, hdr->dram_size);
 350         if (ret)
 351                 return ret;
 352
 353         ret = cdn_dp_set_firmware_active(dp, true);
 354         if (ret) {
 355                 DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
 356                 return ret;
 357         }
 358
 359         return cdn_dp_event_config(dp);
 360 }
 361
 362 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
 363 {
 364         int ret;
 365
 366         if (!cdn_dp_check_sink_connection(dp))
 367                 return -ENODEV;
 368
 369         ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
 370                                DP_RECEIVER_CAP_SIZE);
 371         if (ret) {
 372                 DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
 373                 return ret;
 374         }
 375
 376         kfree(dp->edid);
 377         dp->edid = drm_do_get_edid(&dp->connector,
 378                                    cdn_dp_get_edid_block, dp);
 379         return 0;
 380 }
 381
 382 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
 383 {
 384         union extcon_property_value property;
 385         int ret;
 386
 387         if (!port->phy_enabled) {
 388                 ret = phy_power_on(port->phy);
 389                 if (ret) {
 390                         DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
 391                                       ret);
 392                         goto err_phy;
 393                 }
 394                 port->phy_enabled = true;
 395         }
 396
 397         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 398                                DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
 399         if (ret) {
 400                 DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
 401                 goto err_power_on;
 402         }
 403
 404         ret = cdn_dp_get_hpd_status(dp);
 405         if (ret <= 0) {
 406                 if (!ret)
 407                         DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
 408                 goto err_power_on;
 409         }
 410
 411         ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
 412                                   EXTCON_PROP_USB_TYPEC_POLARITY, &property);
 413         if (ret) {
 414                 DRM_DEV_ERROR(dp->dev, "get property failed\n");
 415                 goto err_power_on;
 416         }
 417
 418         port->lanes = cdn_dp_get_port_lanes(port);
 419         ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
 420         if (ret) {
 421                 DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
 422                               ret);
 423                 goto err_power_on;
 424         }
 425
 426         dp->active_port = port->id;
 427         return 0;
 428
 429 err_power_on:
 430         if (phy_power_off(port->phy))
 431                 DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 432         else
 433                 port->phy_enabled = false;
 434
 435 err_phy:
 436         cdn_dp_grf_write(dp, GRF_SOC_CON26,
 437                          DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 438         return ret;
 439 }
 440
 441 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
 442                               struct cdn_dp_port *port)
 443 {
 444         int ret;
 445
 446         if (port->phy_enabled) {
 447                 ret = phy_power_off(port->phy);
 448                 if (ret) {
 449                         DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
 450                         return ret;
 451                 }
 452         }
 453
 454         port->phy_enabled = false;
 455         port->lanes = 0;
 456         dp->active_port = -1;
 457         return 0;
 458 }
 459
 460 static int cdn_dp_disable(struct cdn_dp_device *dp)
 461 {
 462         int ret, i;
 463
 464         if (!dp->active)
 465                 return 0;
 466
 467         for (i = 0; i < dp->ports; i++)
 468                 cdn_dp_disable_phy(dp, dp->port[i]);
 469
 470         ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
 471                                DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
 472         if (ret) {
 473                 DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
 474                               ret);
 475                 return ret;
 476         }
 477
 478         cdn_dp_set_firmware_active(dp, false);
 479         cdn_dp_clk_disable(dp);
 480         dp->active = false;
 481         dp->max_lanes = 0;
 482         dp->max_rate = 0;
 483         if (!dp->connected) {
 484                 kfree(dp->edid);
 485                 dp->edid = NULL;
 486         }
 487
 488         return 0;
 489 }
 490
 491 static int cdn_dp_enable(struct cdn_dp_device *dp)
 492 {
 493         int ret, i, lanes;
 494         struct cdn_dp_port *port;
 495
 496         port = cdn_dp_connected_port(dp);
 497         if (!port) {
 498                 DRM_DEV_ERROR(dp->dev,
 499                               "Can't enable without connection\n");
 500                 return -ENODEV;
 501         }
 502
 503         if (dp->active)
 504                 return 0;
 505
 506         ret = cdn_dp_clk_enable(dp);
 507         if (ret)
 508                 return ret;
 509
 510         ret = cdn_dp_firmware_init(dp);
 511         if (ret) {
 512                 DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
 513                 goto err_clk_disable;
 514         }
 515
 516         /* only enable the port that connected with downstream device */
 517         for (i = port->id; i < dp->ports; i++) {
 518                 port = dp->port[i];
 519                 lanes = cdn_dp_get_port_lanes(port);
 520                 if (lanes) {
 521                         ret = cdn_dp_enable_phy(dp, port);
 522                         if (ret)
 523                                 continue;
 524
 525                         ret = cdn_dp_get_sink_capability(dp);
 526                         if (ret) {
 527                                 cdn_dp_disable_phy(dp, port);
 528                         } else {
 529                                 dp->active = true;
 530                                 dp->lanes = port->lanes;
 531                                 return 0;
 532                         }
 533                 }
 534         }
 535
 536 err_clk_disable:
 537         cdn_dp_clk_disable(dp);
 538         return ret;
 539 }
 540
 541 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
 542                                     struct drm_display_mode *mode,
 543                                     struct drm_display_mode *adjusted)
 544 {
 545         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 546         struct drm_display_info *display_info = &dp->connector.display_info;
 547         struct video_info *video = &dp->video_info;
 548
 549         switch (display_info->bpc) {
 550         case 10:
 551                 video->color_depth = 10;
 552                 break;
 553         case 6:
 554                 video->color_depth = 6;
 555                 break;
 556         default:
 557                 video->color_depth = 8;
 558                 break;
 559         }
 560
 561         video->color_fmt = PXL_RGB;
 562         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
 563         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
 564
 565         memcpy(&dp->mode, adjusted, sizeof(*mode));
 566 }
 567
 568 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 569 {
 570         u8 link_status[DP_LINK_STATUS_SIZE];
 571         struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 572         u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 573
 574         if (!port || !dp->max_rate || !dp->max_lanes)
 575                 return false;
 576
 577         if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
 578                              DP_LINK_STATUS_SIZE)) {
 579                 DRM_ERROR("Failed to get link status\n");
 580                 return false;
 581         }
 582
 583         /* if link training is requested we should perform it always */
 584         return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 585 }
 586
 587 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 588 {
 589         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 590         int ret, val;
 591
 592         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 593         if (ret < 0) {
 594                 DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
 595                 return;
 596         }
 597
 598         DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
 599                           (ret) ? "LIT" : "BIG");
 600         if (ret)
 601                 val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
 602         else
 603                 val = DP_SEL_VOP_LIT << 16;
 604
 605         ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
 606         if (ret)
 607                 return;
 608
 609         mutex_lock(&dp->lock);
 610
 611         ret = cdn_dp_enable(dp);
 612         if (ret) {
 613                 DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
 614                               ret);
 615                 goto out;
 616         }
 617         if (!cdn_dp_check_link_status(dp)) {
 618                 ret = cdn_dp_train_link(dp);
 619                 if (ret) {
 620                         DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
 621                         goto out;
 622                 }
 623         }
 624
 625         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
 626         if (ret) {
 627                 DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
 628                 goto out;
 629         }
 630
 631         ret = cdn_dp_config_video(dp);
 632         if (ret) {
 633                 DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
 634                 goto out;
 635         }
 636
 637         ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
 638         if (ret) {
 639                 DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
 640                 goto out;
 641         }
 642 out:
 643         mutex_unlock(&dp->lock);
 644 }
 645
 646 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
 647 {
 648         struct cdn_dp_device *dp = encoder_to_dp(encoder);
 649         int ret;
 650
 651         mutex_lock(&dp->lock);
 652         if (dp->active) {
 653                 ret = cdn_dp_disable(dp);
 654                 if (ret) {
 655                         DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
 656                                       ret);
 657                 }
 658         }
 659         mutex_unlock(&dp->lock);
 660
 661         /*
 662          * In the following 2 cases, we need to run the event_work to re-enable
 663          * the DP:
 664          * 1. If there is not just one port device is connected, and remove one
 665          *    device from a port, the DP will be disabled here, at this case,
 666          *    run the event_work to re-open DP for the other port.
 667          * 2. If re-training or re-config failed, the DP will be disabled here.
 668          *    run the event_work to re-connect it.
 669          */
 670         if (!dp->connected && cdn_dp_connected_port(dp))
 671                 schedule_work(&dp->event_work);
 672 }
 673
 674 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 675                                        struct drm_crtc_state *crtc_state,
 676                                        struct drm_connector_state *conn_state)
 677 {
 678         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 679
 680         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 681         s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 682
 683         return 0;
 684 }
 685
 686 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
 687         .mode_set = cdn_dp_encoder_mode_set,
 688         .enable = cdn_dp_encoder_enable,
 689         .disable = cdn_dp_encoder_disable,
 690         .atomic_check = cdn_dp_encoder_atomic_check,
 691 };
 692
 693 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 694 {
 695         struct device *dev = dp->dev;
 696         struct device_node *np = dev->of_node;
 697         struct platform_device *pdev = to_platform_device(dev);
 698         struct resource *res;
 699
 700         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 701         if (IS_ERR(dp->grf)) {
 702                 DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
 703                 return PTR_ERR(dp->grf);
 704         }
 705
 706         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 707         dp->regs = devm_ioremap_resource(dev, res);
 708         if (IS_ERR(dp->regs)) {
 709                 DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 710                 return PTR_ERR(dp->regs);
 711         }
 712
 713         dp->core_clk = devm_clk_get(dev, "core-clk");
 714         if (IS_ERR(dp->core_clk)) {
 715                 DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
 716                 return PTR_ERR(dp->core_clk);
 717         }
 718
 719         dp->pclk = devm_clk_get(dev, "pclk");
 720         if (IS_ERR(dp->pclk)) {
 721                 DRM_DEV_ERROR(dev, "cannot get pclk\n");
 722                 return PTR_ERR(dp->pclk);
 723         }
 724
 725         dp->spdif_clk = devm_clk_get(dev, "spdif");
 726         if (IS_ERR(dp->spdif_clk)) {
 727                 DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
 728                 return PTR_ERR(dp->spdif_clk);
 729         }
 730
 731         dp->grf_clk = devm_clk_get(dev, "grf");
 732         if (IS_ERR(dp->grf_clk)) {
 733                 DRM_DEV_ERROR(dev, "cannot get grf clk\n");
 734                 return PTR_ERR(dp->grf_clk);
 735         }
 736
 737         dp->spdif_rst = devm_reset_control_get(dev, "spdif");
 738         if (IS_ERR(dp->spdif_rst)) {
 739                 DRM_DEV_ERROR(dev, "no spdif reset control found\n");
 740                 return PTR_ERR(dp->spdif_rst);
 741         }
 742
 743         dp->dptx_rst = devm_reset_control_get(dev, "dptx");
 744         if (IS_ERR(dp->dptx_rst)) {
 745                 DRM_DEV_ERROR(dev, "no uphy reset control found\n");
 746                 return PTR_ERR(dp->dptx_rst);
 747         }
 748
 749         dp->core_rst = devm_reset_control_get(dev, "core");
 750         if (IS_ERR(dp->core_rst)) {
 751                 DRM_DEV_ERROR(dev, "no core reset control found\n");
 752                 return PTR_ERR(dp->core_rst);
 753         }
 754
 755         dp->apb_rst = devm_reset_control_get(dev, "apb");
 756         if (IS_ERR(dp->apb_rst)) {
 757                 DRM_DEV_ERROR(dev, "no apb reset control found\n");
 758                 return PTR_ERR(dp->apb_rst);
 759         }
 760
 761         return 0;
 762 }
 763
 764 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
 765                                   struct hdmi_codec_daifmt *daifmt,
 766                                   struct hdmi_codec_params *params)
 767 {
 768         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 769         struct audio_info audio = {
 770                 .sample_width = params->sample_width,
 771                 .sample_rate = params->sample_rate,
 772                 .channels = params->channels,
 773         };
 774         int ret;
 775
 776         mutex_lock(&dp->lock);
 777         if (!dp->active) {
 778                 ret = -ENODEV;
 779                 goto out;
 780         }
 781
 782         switch (daifmt->fmt) {
 783         case HDMI_I2S:
 784                 audio.format = AFMT_I2S;
 785                 break;
 786         case HDMI_SPDIF:
 787                 audio.format = AFMT_SPDIF;
 788                 break;
 789         default:
 790                 DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
 791                 ret = -EINVAL;
 792                 goto out;
 793         }
 794
 795         ret = cdn_dp_audio_config(dp, &audio);
 796         if (!ret)
 797                 dp->audio_info = audio;
 798
 799 out:
 800         mutex_unlock(&dp->lock);
 801         return ret;
 802 }
 803
 804 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
 805 {
 806         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 807         int ret;
 808
 809         mutex_lock(&dp->lock);
 810         if (!dp->active)
 811                 goto out;
 812
 813         ret = cdn_dp_audio_stop(dp, &dp->audio_info);
 814         if (!ret)
 815                 dp->audio_info.format = AFMT_UNUSED;
 816 out:
 817         mutex_unlock(&dp->lock);
 818 }
 819
 820 static int cdn_dp_audio_mute_stream(struct device *dev, void *data,
 821                                     bool enable, int direction)
 822 {
 823         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 824         int ret;
 825
 826         mutex_lock(&dp->lock);
 827         if (!dp->active) {
 828                 ret = -ENODEV;
 829                 goto out;
 830         }
 831
 832         ret = cdn_dp_audio_mute(dp, enable);
 833
 834 out:
 835         mutex_unlock(&dp->lock);
 836         return ret;
 837 }
 838
 839 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
 840                                 u8 *buf, size_t len)
 841 {
 842         struct cdn_dp_device *dp = dev_get_drvdata(dev);
 843
 844         memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
 845
 846         return 0;
 847 }
 848
 849 static const struct hdmi_codec_ops audio_codec_ops = {
 850         .hw_params = cdn_dp_audio_hw_params,
 851         .audio_shutdown = cdn_dp_audio_shutdown,
 852         .mute_stream = cdn_dp_audio_mute_stream,
 853         .get_eld = cdn_dp_audio_get_eld,
 854         .no_capture_mute = 1,
 855 };
 856
 857 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
 858                                    struct device *dev)
 859 {
 860         struct hdmi_codec_pdata codec_data = {
 861                 .i2s = 1,
 862                 .spdif = 1,
 863                 .ops = &audio_codec_ops,
 864                 .max_i2s_channels = 8,
 865         };
 866
 867         dp->audio_pdev = platform_device_register_data(
 868                          dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 869                          &codec_data, sizeof(codec_data));
 870
 871         return PTR_ERR_OR_ZERO(dp->audio_pdev);
 872 }
 873
 874 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
 875 {
 876         int ret;
 877         unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
 878         unsigned long sleep = 1000;
 879
 880         WARN_ON(!mutex_is_locked(&dp->lock));
 881
 882         if (dp->fw_loaded)
 883                 return 0;
 884
 885         /* Drop the lock before getting the firmware to avoid blocking boot */
 886         mutex_unlock(&dp->lock);
 887
 888         while (time_before(jiffies, timeout)) {
 889                 ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
 890                 if (ret == -ENOENT) {
 891                         msleep(sleep);
 892                         sleep *= 2;
 893                         continue;
 894                 } else if (ret) {
 895                         DRM_DEV_ERROR(dp->dev,
 896                                       "failed to request firmware: %d\n", ret);
 897                         goto out;
 898                 }
 899
 900                 dp->fw_loaded = true;
 901                 ret = 0;
 902                 goto out;
 903         }
 904
 905         DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
 906         ret = -ETIMEDOUT;
 907 out:
 908         mutex_lock(&dp->lock);
 909         return ret;
 910 }
 911
 912 static void cdn_dp_pd_event_work(struct work_struct *work)
 913 {
 914         struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 915                                                 event_work);
 916         struct drm_connector *connector = &dp->connector;
 917         enum drm_connector_status old_status;
 918
 919         int ret;
 920
 921         mutex_lock(&dp->lock);
 922
 923         if (dp->suspended)
 924                 goto out;
 925
 926         ret = cdn_dp_request_firmware(dp);
 927         if (ret)
 928                 goto out;
 929
 930         dp->connected = true;
 931
 932         /* Not connected, notify userspace to disable the block */
 933         if (!cdn_dp_connected_port(dp)) {
 934                 DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
 935                 dp->connected = false;
 936
 937         /* Connected but not enabled, enable the block */
 938         } else if (!dp->active) {
 939                 DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
 940                 ret = cdn_dp_enable(dp);
 941                 if (ret) {
 942                         DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
 943                         dp->connected = false;
 944                 }
 945
 946         /* Enabled and connected to a dongle without a sink, notify userspace */
 947         } else if (!cdn_dp_check_sink_connection(dp)) {
 948                 DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
 949                 dp->connected = false;
 950
 951         /* Enabled and connected with a sink, re-train if requested */
 952         } else if (!cdn_dp_check_link_status(dp)) {
 953                 unsigned int rate = dp->max_rate;
 954                 unsigned int lanes = dp->max_lanes;
 955                 struct drm_display_mode *mode = &dp->mode;
 956
 957                 DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
 958                 ret = cdn_dp_train_link(dp);
 959                 if (ret) {
 960                         dp->connected = false;
 961                         DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
 962                         goto out;
 963                 }
 964
 965                 /* If training result is changed, update the video config */
 966                 if (mode->clock &&
 967                     (rate != dp->max_rate || lanes != dp->max_lanes)) {
 968                         ret = cdn_dp_config_video(dp);
 969                         if (ret) {
 970                                 dp->connected = false;
 971                                 DRM_DEV_ERROR(dp->dev,
 972                                               "Failed to config video %d\n",
 973                                               ret);
 974                         }
 975                 }
 976         }
 977
 978 out:
 979         mutex_unlock(&dp->lock);
 980
 981         old_status = connector->status;
 982         connector->status = connector->funcs->detect(connector, false);
 983         if (old_status != connector->status)
 984                 drm_kms_helper_hotplug_event(dp->drm_dev);
 985 }
 986
 987 static int cdn_dp_pd_event(struct notifier_block *nb,
 988                            unsigned long event, void *priv)
 989 {
 990         struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
 991                                                 event_nb);
 992         struct cdn_dp_device *dp = port->dp;
 993
 994         /*
 995          * It would be nice to be able to just do the work inline right here.
 996          * However, we need to make a bunch of calls that might sleep in order
 997          * to turn on the block/phy, so use a worker instead.
 998          */
 999         schedule_work(&dp->event_work);
1000
1001         return NOTIFY_DONE;
1002 }
1003
1004 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1005 {
1006         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1007         struct drm_encoder *encoder;
1008         struct drm_connector *connector;
1009         struct cdn_dp_port *port;
1010         struct drm_device *drm_dev = data;
1011         int ret, i;
1012
1013         ret = cdn_dp_parse_dt(dp);
1014         if (ret < 0)
1015                 return ret;
1016
1017         dp->drm_dev = drm_dev;
1018         dp->connected = false;
1019         dp->active = false;
1020         dp->active_port = -1;
1021         dp->fw_loaded = false;
1022
1023         INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1024
1025         encoder = &dp->encoder;
1026
1027         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1028                                                              dev->of_node);
1029         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1030
1031         ret = drm_simple_encoder_init(drm_dev, encoder,
1032                                       DRM_MODE_ENCODER_TMDS);
1033         if (ret) {
1034                 DRM_ERROR("failed to initialize encoder with drm\n");
1035                 return ret;
1036         }
1037
1038         drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1039
1040         connector = &dp->connector;
1041         connector->polled = DRM_CONNECTOR_POLL_HPD;
1042         connector->dpms = DRM_MODE_DPMS_OFF;
1043
1044         ret = drm_connector_init(drm_dev, connector,
1045                                  &cdn_dp_atomic_connector_funcs,
1046                                  DRM_MODE_CONNECTOR_DisplayPort);
1047         if (ret) {
1048                 DRM_ERROR("failed to initialize connector with drm\n");
1049                 goto err_free_encoder;
1050         }
1051
1052         drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1053
1054         ret = drm_connector_attach_encoder(connector, encoder);
1055         if (ret) {
1056                 DRM_ERROR("failed to attach connector and encoder\n");
1057                 goto err_free_connector;
1058         }
1059
1060         for (i = 0; i < dp->ports; i++) {
1061                 port = dp->port[i];
1062
1063                 port->event_nb.notifier_call = cdn_dp_pd_event;
1064                 ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1065                                                     EXTCON_DISP_DP,
1066                                                     &port->event_nb);
1067                 if (ret) {
1068                         DRM_DEV_ERROR(dev,
1069                                       "register EXTCON_DISP_DP notifier err\n");
1070                         goto err_free_connector;
1071                 }
1072         }
1073
1074         pm_runtime_enable(dev);
1075
1076         schedule_work(&dp->event_work);
1077
1078         return 0;
1079
1080 err_free_connector:
1081         drm_connector_cleanup(connector);
1082 err_free_encoder:
1083         drm_encoder_cleanup(encoder);
1084         return ret;
1085 }
1086
1087 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1088 {
1089         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1090         struct drm_encoder *encoder = &dp->encoder;
1091         struct drm_connector *connector = &dp->connector;
1092
1093         cancel_work_sync(&dp->event_work);
1094         cdn_dp_encoder_disable(encoder);
1095         encoder->funcs->destroy(encoder);
1096         connector->funcs->destroy(connector);
1097
1098         pm_runtime_disable(dev);
1099         if (dp->fw_loaded)
1100                 release_firmware(dp->fw);
1101         kfree(dp->edid);
1102         dp->edid = NULL;
1103 }
1104
1105 static const struct component_ops cdn_dp_component_ops = {
1106         .bind = cdn_dp_bind,
1107         .unbind = cdn_dp_unbind,
1108 };
1109
1110 static int cdn_dp_suspend(struct device *dev)
1111 {
1112         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1113         int ret = 0;
1114
1115         mutex_lock(&dp->lock);
1116         if (dp->active)
1117                 ret = cdn_dp_disable(dp);
1118         dp->suspended = true;
1119         mutex_unlock(&dp->lock);
1120
1121         return ret;
1122 }
1123
1124 static int cdn_dp_resume(struct device *dev)
1125 {
1126         struct cdn_dp_device *dp = dev_get_drvdata(dev);
1127
1128         mutex_lock(&dp->lock);
1129         dp->suspended = false;
1130         if (dp->fw_loaded)
1131                 schedule_work(&dp->event_work);
1132         mutex_unlock(&dp->lock);
1133
1134         return 0;
1135 }
1136
1137 static int cdn_dp_probe(struct platform_device *pdev)
1138 {
1139         struct device *dev = &pdev->dev;
1140         const struct of_device_id *match;
1141         struct cdn_dp_data *dp_data;
1142         struct cdn_dp_port *port;
1143         struct cdn_dp_device *dp;
1144         struct extcon_dev *extcon;
1145         struct phy *phy;
1146         int i;
1147
1148         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1149         if (!dp)
1150                 return -ENOMEM;
1151         dp->dev = dev;
1152
1153         match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1154         dp_data = (struct cdn_dp_data *)match->data;
1155
1156         for (i = 0; i < dp_data->max_phy; i++) {
1157                 extcon = extcon_get_edev_by_phandle(dev, i);
1158                 phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1159
1160                 if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1161                     PTR_ERR(phy) == -EPROBE_DEFER)
1162                         return -EPROBE_DEFER;
1163
1164                 if (IS_ERR(extcon) || IS_ERR(phy))
1165                         continue;
1166
1167                 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1168                 if (!port)
1169                         return -ENOMEM;
1170
1171                 port->extcon = extcon;
1172                 port->phy = phy;
1173                 port->dp = dp;
1174                 port->id = i;
1175                 dp->port[dp->ports++] = port;
1176         }
1177
1178         if (!dp->ports) {
1179                 DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1180                 return -EINVAL;
1181         }
1182
1183         mutex_init(&dp->lock);
1184         dev_set_drvdata(dev, dp);
1185
1186         cdn_dp_audio_codec_init(dp, dev);
1187
1188         return component_add(dev, &cdn_dp_component_ops);
1189 }
1190
1191 static int cdn_dp_remove(struct platform_device *pdev)
1192 {
1193         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1194
1195         platform_device_unregister(dp->audio_pdev);
1196         cdn_dp_suspend(dp->dev);
1197         component_del(&pdev->dev, &cdn_dp_component_ops);
1198
1199         return 0;
1200 }
1201
1202 static void cdn_dp_shutdown(struct platform_device *pdev)
1203 {
1204         struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1205
1206         cdn_dp_suspend(dp->dev);
1207 }
1208
1209 static const struct dev_pm_ops cdn_dp_pm_ops = {
1210         SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1211                                 cdn_dp_resume)
1212 };
1213
1214 struct platform_driver cdn_dp_driver = {
1215         .probe = cdn_dp_probe,
1216         .remove = cdn_dp_remove,
1217         .shutdown = cdn_dp_shutdown,
1218         .driver = {
1219                    .name = "cdn-dp",
1220                    .owner = THIS_MODULE,
1221                    .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1222                    .pm = &cdn_dp_pm_ops,
1223         },
1224 };