drivers/gpu/drm/msm/dp/dp_display.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/slab.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/component.h>
  11 #include <linux/of_irq.h>
  12 #include <linux/delay.h>
  13 #include <drm/display/drm_dp_aux_bus.h>
  14
  15 #include "msm_drv.h"
  16 #include "msm_kms.h"
  17 #include "dp_hpd.h"
  18 #include "dp_parser.h"
  19 #include "dp_power.h"
  20 #include "dp_catalog.h"
  21 #include "dp_aux.h"
  22 #include "dp_reg.h"
  23 #include "dp_link.h"
  24 #include "dp_panel.h"
  25 #include "dp_ctrl.h"
  26 #include "dp_display.h"
  27 #include "dp_drm.h"
  28 #include "dp_audio.h"
  29 #include "dp_debug.h"
  30
  31 #define HPD_STRING_SIZE 30
  32
  33 enum {
  34         ISR_DISCONNECTED,
  35         ISR_CONNECT_PENDING,
  36         ISR_CONNECTED,
  37         ISR_HPD_REPLUG_COUNT,
  38         ISR_IRQ_HPD_PULSE_COUNT,
  39         ISR_HPD_LO_GLITH_COUNT,
  40 };
  41
  42 /* event thread connection state */
  43 enum {
  44         ST_DISCONNECTED,
  45         ST_MAINLINK_READY,
  46         ST_CONNECTED,
  47         ST_DISCONNECT_PENDING,
  48         ST_DISPLAY_OFF,
  49         ST_SUSPENDED,
  50 };
  51
  52 enum {
  53         EV_NO_EVENT,
  54         /* hpd events */
  55         EV_HPD_INIT_SETUP,
  56         EV_HPD_PLUG_INT,
  57         EV_IRQ_HPD_INT,
  58         EV_HPD_UNPLUG_INT,
  59         EV_USER_NOTIFICATION,
  60 };
  61
  62 #define EVENT_TIMEOUT   (HZ/10) /* 100ms */
  63 #define DP_EVENT_Q_MAX  8
  64
  65 #define DP_TIMEOUT_NONE         0
  66
  67 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  68
  69 struct dp_event {
  70         u32 event_id;
  71         u32 data;
  72         u32 delay;
  73 };
  74
  75 struct dp_display_private {
  76         char *name;
  77         int irq;
  78
  79         unsigned int id;
  80
  81         /* state variables */
  82         bool core_initialized;
  83         bool phy_initialized;
  84         bool hpd_irq_on;
  85         bool audio_supported;
  86
  87         struct drm_device *drm_dev;
  88         struct platform_device *pdev;
  89         struct dentry *root;
  90
  91         struct dp_usbpd   *usbpd;
  92         struct dp_parser  *parser;
  93         struct dp_power   *power;
  94         struct dp_catalog *catalog;
  95         struct drm_dp_aux *aux;
  96         struct dp_link    *link;
  97         struct dp_panel   *panel;
  98         struct dp_ctrl    *ctrl;
  99         struct dp_debug   *debug;
 100
 101         struct dp_usbpd_cb usbpd_cb;
 102         struct dp_display_mode dp_mode;
 103         struct msm_dp dp_display;
 104
 105         /* wait for audio signaling */
 106         struct completion audio_comp;
 107
 108         /* event related only access by event thread */
 109         struct mutex event_mutex;
 110         wait_queue_head_t event_q;
 111         u32 hpd_state;
 112         u32 event_pndx;
 113         u32 event_gndx;
 114         struct task_struct *ev_tsk;
 115         struct dp_event event_list[DP_EVENT_Q_MAX];
 116         spinlock_t event_lock;
 117
 118         bool wide_bus_en;
 119
 120         struct dp_audio *audio;
 121 };
 122
 123 struct msm_dp_desc {
 124         phys_addr_t io_start;
 125         unsigned int connector_type;
 126         bool wide_bus_en;
 127 };
 128
 129 struct msm_dp_config {
 130         const struct msm_dp_desc *descs;
 131         size_t num_descs;
 132 };
 133
 134 static const struct msm_dp_config sc7180_dp_cfg = {
 135         .descs = (const struct msm_dp_desc[]) {
 136                 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 137         },
 138         .num_descs = 1,
 139 };
 140
 141 static const struct msm_dp_config sc7280_dp_cfg = {
 142         .descs = (const struct msm_dp_desc[]) {
 143                 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 144                 [MSM_DP_CONTROLLER_1] = { .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 145         },
 146         .num_descs = 2,
 147 };
 148
 149 static const struct msm_dp_config sc8180x_dp_cfg = {
 150         .descs = (const struct msm_dp_desc[]) {
 151                 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 152                 [MSM_DP_CONTROLLER_1] = { .io_start = 0x0ae98000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 153                 [MSM_DP_CONTROLLER_2] = { .io_start = 0x0ae9a000, .connector_type = DRM_MODE_CONNECTOR_eDP },
 154         },
 155         .num_descs = 3,
 156 };
 157
 158 static const struct msm_dp_config sm8350_dp_cfg = {
 159         .descs = (const struct msm_dp_desc[]) {
 160                 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 161         },
 162         .num_descs = 1,
 163 };
 164
 165 static const struct of_device_id dp_dt_match[] = {
 166         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
 167         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_cfg },
 168         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_cfg },
 169         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_cfg },
 170         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_cfg },
 171         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_cfg },
 172         {}
 173 };
 174
 175 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 176 {
 177         struct msm_dp *dp = dev_get_drvdata(dev);
 178
 179         return container_of(dp, struct dp_display_private, dp_display);
 180 }
 181
 182 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 183                                                 u32 data, u32 delay)
 184 {
 185         unsigned long flag;
 186         struct dp_event *todo;
 187         int pndx;
 188
 189         spin_lock_irqsave(&dp_priv->event_lock, flag);
 190         pndx = dp_priv->event_pndx + 1;
 191         pndx %= DP_EVENT_Q_MAX;
 192         if (pndx == dp_priv->event_gndx) {
 193                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 194                         dp_priv->event_pndx, dp_priv->event_gndx);
 195                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 196                 return -EPERM;
 197         }
 198         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 199         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 200         todo->event_id = event;
 201         todo->data = data;
 202         todo->delay = delay;
 203         wake_up(&dp_priv->event_q);
 204         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 205
 206         return 0;
 207 }
 208
 209 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 210 {
 211         unsigned long flag;
 212         struct dp_event *todo;
 213         u32     gndx;
 214
 215         spin_lock_irqsave(&dp_priv->event_lock, flag);
 216         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 217                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 218                 return -ENOENT;
 219         }
 220
 221         gndx = dp_priv->event_gndx;
 222         while (dp_priv->event_pndx != gndx) {
 223                 todo = &dp_priv->event_list[gndx];
 224                 if (todo->event_id == event) {
 225                         todo->event_id = EV_NO_EVENT;   /* deleted */
 226                         todo->delay = 0;
 227                 }
 228                 gndx++;
 229                 gndx %= DP_EVENT_Q_MAX;
 230         }
 231         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 232
 233         return 0;
 234 }
 235
 236 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 237 {
 238         struct dp_display_private *dp;
 239
 240         dp = container_of(dp_display, struct dp_display_private, dp_display);
 241
 242         reinit_completion(&dp->audio_comp);
 243 }
 244
 245 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 246 {
 247         struct dp_display_private *dp;
 248
 249         dp = container_of(dp_display, struct dp_display_private, dp_display);
 250
 251         complete_all(&dp->audio_comp);
 252 }
 253
 254 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 255
 256 static int dp_display_bind(struct device *dev, struct device *master,
 257                            void *data)
 258 {
 259         int rc = 0;
 260         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 261         struct msm_drm_private *priv = dev_get_drvdata(master);
 262         struct drm_device *drm = priv->dev;
 263
 264         dp->dp_display.drm_dev = drm;
 265         priv->dp[dp->id] = &dp->dp_display;
 266
 267         rc = dp->parser->parse(dp->parser);
 268         if (rc) {
 269                 DRM_ERROR("device tree parsing failed\n");
 270                 goto end;
 271         }
 272
 273
 274         dp->drm_dev = drm;
 275         dp->aux->drm_dev = drm;
 276         rc = dp_aux_register(dp->aux);
 277         if (rc) {
 278                 DRM_ERROR("DRM DP AUX register failed\n");
 279                 goto end;
 280         }
 281
 282         rc = dp_power_client_init(dp->power);
 283         if (rc) {
 284                 DRM_ERROR("Power client create failed\n");
 285                 goto end;
 286         }
 287
 288         rc = dp_register_audio_driver(dev, dp->audio);
 289         if (rc) {
 290                 DRM_ERROR("Audio registration Dp failed\n");
 291                 goto end;
 292         }
 293
 294         rc = dp_hpd_event_thread_start(dp);
 295         if (rc) {
 296                 DRM_ERROR("Event thread create failed\n");
 297                 goto end;
 298         }
 299
 300         return 0;
 301 end:
 302         return rc;
 303 }
 304
 305 static void dp_display_unbind(struct device *dev, struct device *master,
 306                               void *data)
 307 {
 308         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 309         struct msm_drm_private *priv = dev_get_drvdata(master);
 310
 311         /* disable all HPD interrupts */
 312         if (dp->core_initialized)
 313                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
 314
 315         kthread_stop(dp->ev_tsk);
 316
 317         dp_power_client_deinit(dp->power);
 318         dp_aux_unregister(dp->aux);
 319         priv->dp[dp->id] = NULL;
 320 }
 321
 322 static const struct component_ops dp_display_comp_ops = {
 323         .bind = dp_display_bind,
 324         .unbind = dp_display_unbind,
 325 };
 326
 327 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
 328 {
 329         return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
 330                 DP_DWN_STRM_PORT_PRESENT);
 331 }
 332
 333 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
 334 {
 335         drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
 336                         dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
 337                 dp->link->sink_count);
 338         return dp_display_is_ds_bridge(dp->panel) &&
 339                 (dp->link->sink_count == 0);
 340 }
 341
 342 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 343 {
 344         struct dp_display_private *dp;
 345         struct drm_connector *connector;
 346
 347         dp = container_of(dp_display, struct dp_display_private, dp_display);
 348
 349         connector = dp->dp_display.connector;
 350         drm_helper_hpd_irq_event(connector->dev);
 351 }
 352
 353
 354 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 355                                             bool hpd)
 356 {
 357         if ((hpd && dp->dp_display.is_connected) ||
 358                         (!hpd && !dp->dp_display.is_connected)) {
 359                 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 360                                 (hpd ? "on" : "off"));
 361                 return 0;
 362         }
 363
 364         /* reset video pattern flag on disconnect */
 365         if (!hpd)
 366                 dp->panel->video_test = false;
 367
 368         dp->dp_display.is_connected = hpd;
 369
 370         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 371                         dp->dp_display.connector_type, hpd);
 372         dp_display_send_hpd_event(&dp->dp_display);
 373
 374         return 0;
 375 }
 376
 377 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 378 {
 379         int rc = 0;
 380         struct edid *edid;
 381
 382         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 383
 384         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 385         if (rc)
 386                 goto end;
 387
 388         dp_link_process_request(dp->link);
 389
 390         edid = dp->panel->edid;
 391
 392         dp->audio_supported = drm_detect_monitor_audio(edid);
 393         dp_panel_handle_sink_request(dp->panel);
 394
 395         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 396
 397         /*
 398          * set sink to normal operation mode -- D0
 399          * before dpcd read
 400          */
 401         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 402
 403         dp_link_reset_phy_params_vx_px(dp->link);
 404         rc = dp_ctrl_on_link(dp->ctrl);
 405         if (rc) {
 406                 DRM_ERROR("failed to complete DP link training\n");
 407                 goto end;
 408         }
 409
 410         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 411
 412 end:
 413         return rc;
 414 }
 415
 416 static void dp_display_host_phy_init(struct dp_display_private *dp)
 417 {
 418         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 419                 dp->dp_display.connector_type, dp->core_initialized,
 420                 dp->phy_initialized);
 421
 422         if (!dp->phy_initialized) {
 423                 dp_ctrl_phy_init(dp->ctrl);
 424                 dp->phy_initialized = true;
 425         }
 426 }
 427
 428 static void dp_display_host_phy_exit(struct dp_display_private *dp)
 429 {
 430         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 431                 dp->dp_display.connector_type, dp->core_initialized,
 432                 dp->phy_initialized);
 433
 434         if (dp->phy_initialized) {
 435                 dp_ctrl_phy_exit(dp->ctrl);
 436                 dp->phy_initialized = false;
 437         }
 438 }
 439
 440 static void dp_display_host_init(struct dp_display_private *dp)
 441 {
 442         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 443                 dp->dp_display.connector_type, dp->core_initialized,
 444                 dp->phy_initialized);
 445
 446         dp_power_init(dp->power, false);
 447         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 448         dp_aux_init(dp->aux);
 449         dp->core_initialized = true;
 450 }
 451
 452 static void dp_display_host_deinit(struct dp_display_private *dp)
 453 {
 454         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 455                 dp->dp_display.connector_type, dp->core_initialized,
 456                 dp->phy_initialized);
 457
 458         dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
 459         dp_aux_deinit(dp->aux);
 460         dp_power_deinit(dp->power);
 461         dp->core_initialized = false;
 462 }
 463
 464 static int dp_display_usbpd_configure_cb(struct device *dev)
 465 {
 466         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 467
 468         dp_display_host_phy_init(dp);
 469
 470         return dp_display_process_hpd_high(dp);
 471 }
 472
 473 static int dp_display_usbpd_disconnect_cb(struct device *dev)
 474 {
 475         return 0;
 476 }
 477
 478 static int dp_display_notify_disconnect(struct device *dev)
 479 {
 480         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 481
 482         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 483
 484         return 0;
 485 }
 486
 487 static void dp_display_handle_video_request(struct dp_display_private *dp)
 488 {
 489         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 490                 dp->panel->video_test = true;
 491                 dp_link_send_test_response(dp->link);
 492         }
 493 }
 494
 495 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 496 {
 497         int rc = 0;
 498
 499         if (dp_display_is_sink_count_zero(dp)) {
 500                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 501                 if (dp->hpd_state != ST_DISCONNECTED) {
 502                         dp->hpd_state = ST_DISCONNECT_PENDING;
 503                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 504                 }
 505         } else {
 506                 if (dp->hpd_state == ST_DISCONNECTED) {
 507                         dp->hpd_state = ST_MAINLINK_READY;
 508                         rc = dp_display_process_hpd_high(dp);
 509                         if (rc)
 510                                 dp->hpd_state = ST_DISCONNECTED;
 511                 }
 512         }
 513
 514         return rc;
 515 }
 516
 517 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 518 {
 519         u32 sink_request = dp->link->sink_request;
 520
 521         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 522         if (dp->hpd_state == ST_DISCONNECTED) {
 523                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 524                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 525                                                         sink_request);
 526                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 527                         return -EINVAL;
 528                 }
 529         }
 530
 531         dp_ctrl_handle_sink_request(dp->ctrl);
 532
 533         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 534                 dp_display_handle_video_request(dp);
 535
 536         return 0;
 537 }
 538
 539 static int dp_display_usbpd_attention_cb(struct device *dev)
 540 {
 541         int rc = 0;
 542         u32 sink_request;
 543         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 544
 545         /* check for any test request issued by sink */
 546         rc = dp_link_process_request(dp->link);
 547         if (!rc) {
 548                 sink_request = dp->link->sink_request;
 549                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 550                                         dp->hpd_state, sink_request);
 551                 if (sink_request & DS_PORT_STATUS_CHANGED)
 552                         rc = dp_display_handle_port_ststus_changed(dp);
 553                 else
 554                         rc = dp_display_handle_irq_hpd(dp);
 555         }
 556
 557         return rc;
 558 }
 559
 560 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 561 {
 562         struct dp_usbpd *hpd = dp->usbpd;
 563         u32 state;
 564         int ret;
 565
 566         if (!hpd)
 567                 return 0;
 568
 569         mutex_lock(&dp->event_mutex);
 570
 571         state =  dp->hpd_state;
 572         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 573                         dp->dp_display.connector_type, state);
 574
 575         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 576                 mutex_unlock(&dp->event_mutex);
 577                 return 0;
 578         }
 579
 580         if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
 581                 mutex_unlock(&dp->event_mutex);
 582                 return 0;
 583         }
 584
 585         if (state == ST_DISCONNECT_PENDING) {
 586                 /* wait until ST_DISCONNECTED */
 587                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
 588                 mutex_unlock(&dp->event_mutex);
 589                 return 0;
 590         }
 591
 592         ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
 593         if (ret) {      /* link train failed */
 594                 dp->hpd_state = ST_DISCONNECTED;
 595         } else {
 596                 dp->hpd_state = ST_MAINLINK_READY;
 597         }
 598
 599         /* enable HDP irq_hpd/replug interrupt */
 600         dp_catalog_hpd_config_intr(dp->catalog,
 601                 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, true);
 602
 603         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 604                         dp->dp_display.connector_type, state);
 605         mutex_unlock(&dp->event_mutex);
 606
 607         /* uevent will complete connection part */
 608         return 0;
 609 };
 610
 611 static int dp_display_enable(struct dp_display_private *dp, u32 data);
 612 static int dp_display_disable(struct dp_display_private *dp, u32 data);
 613
 614 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 615                 bool plugged)
 616 {
 617         struct dp_display_private *dp;
 618
 619         dp = container_of(dp_display,
 620                         struct dp_display_private, dp_display);
 621
 622         /* notify audio subsystem only if sink supports audio */
 623         if (dp_display->plugged_cb && dp_display->codec_dev &&
 624                         dp->audio_supported)
 625                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 626 }
 627
 628 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 629 {
 630         struct dp_usbpd *hpd = dp->usbpd;
 631         u32 state;
 632
 633         if (!hpd)
 634                 return 0;
 635
 636         mutex_lock(&dp->event_mutex);
 637
 638         state = dp->hpd_state;
 639
 640         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 641                         dp->dp_display.connector_type, state);
 642
 643         /* disable irq_hpd/replug interrupts */
 644         dp_catalog_hpd_config_intr(dp->catalog,
 645                 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, false);
 646
 647         /* unplugged, no more irq_hpd handle */
 648         dp_del_event(dp, EV_IRQ_HPD_INT);
 649
 650         if (state == ST_DISCONNECTED) {
 651                 /* triggered by irq_hdp with sink_count = 0 */
 652                 if (dp->link->sink_count == 0) {
 653                         dp_display_host_phy_exit(dp);
 654                 }
 655                 dp_display_notify_disconnect(&dp->pdev->dev);
 656                 mutex_unlock(&dp->event_mutex);
 657                 return 0;
 658         } else if (state == ST_DISCONNECT_PENDING) {
 659                 mutex_unlock(&dp->event_mutex);
 660                 return 0;
 661         } else if (state == ST_MAINLINK_READY) {
 662                 dp_ctrl_off_link(dp->ctrl);
 663                 dp_display_host_phy_exit(dp);
 664                 dp->hpd_state = ST_DISCONNECTED;
 665                 dp_display_notify_disconnect(&dp->pdev->dev);
 666                 mutex_unlock(&dp->event_mutex);
 667                 return 0;
 668         }
 669
 670         /* disable HPD plug interrupts */
 671         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
 672
 673         /*
 674          * We don't need separate work for disconnect as
 675          * connect/attention interrupts are disabled
 676          */
 677         dp_display_notify_disconnect(&dp->pdev->dev);
 678
 679         if (state == ST_DISPLAY_OFF) {
 680                 dp->hpd_state = ST_DISCONNECTED;
 681         } else {
 682                 dp->hpd_state = ST_DISCONNECT_PENDING;
 683         }
 684
 685         /* signal the disconnect event early to ensure proper teardown */
 686         dp_display_handle_plugged_change(&dp->dp_display, false);
 687
 688         /* enable HDP plug interrupt to prepare for next plugin */
 689         if (!dp->dp_display.is_edp)
 690                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
 691
 692         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 693                         dp->dp_display.connector_type, state);
 694
 695         /* uevent will complete disconnection part */
 696         mutex_unlock(&dp->event_mutex);
 697         return 0;
 698 }
 699
 700 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 701 {
 702         u32 state;
 703
 704         mutex_lock(&dp->event_mutex);
 705
 706         /* irq_hpd can happen at either connected or disconnected state */
 707         state =  dp->hpd_state;
 708         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 709                         dp->dp_display.connector_type, state);
 710
 711         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 712                 mutex_unlock(&dp->event_mutex);
 713                 return 0;
 714         }
 715
 716         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 717                 /* wait until ST_CONNECTED */
 718                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 719                 mutex_unlock(&dp->event_mutex);
 720                 return 0;
 721         }
 722
 723         dp_display_usbpd_attention_cb(&dp->pdev->dev);
 724
 725         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 726                         dp->dp_display.connector_type, state);
 727
 728         mutex_unlock(&dp->event_mutex);
 729
 730         return 0;
 731 }
 732
 733 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 734 {
 735         dp_debug_put(dp->debug);
 736         dp_audio_put(dp->audio);
 737         dp_panel_put(dp->panel);
 738         dp_aux_put(dp->aux);
 739 }
 740
 741 static int dp_init_sub_modules(struct dp_display_private *dp)
 742 {
 743         int rc = 0;
 744         struct device *dev = &dp->pdev->dev;
 745         struct dp_usbpd_cb *cb = &dp->usbpd_cb;
 746         struct dp_panel_in panel_in = {
 747                 .dev = dev,
 748         };
 749
 750         /* Callback APIs used for cable status change event */
 751         cb->configure  = dp_display_usbpd_configure_cb;
 752         cb->disconnect = dp_display_usbpd_disconnect_cb;
 753         cb->attention  = dp_display_usbpd_attention_cb;
 754
 755         dp->usbpd = dp_hpd_get(dev, cb);
 756         if (IS_ERR(dp->usbpd)) {
 757                 rc = PTR_ERR(dp->usbpd);
 758                 DRM_ERROR("failed to initialize hpd, rc = %d\n", rc);
 759                 dp->usbpd = NULL;
 760                 goto error;
 761         }
 762
 763         dp->parser = dp_parser_get(dp->pdev);
 764         if (IS_ERR(dp->parser)) {
 765                 rc = PTR_ERR(dp->parser);
 766                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 767                 dp->parser = NULL;
 768                 goto error;
 769         }
 770
 771         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 772         if (IS_ERR(dp->catalog)) {
 773                 rc = PTR_ERR(dp->catalog);
 774                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 775                 dp->catalog = NULL;
 776                 goto error;
 777         }
 778
 779         dp->power = dp_power_get(dev, dp->parser);
 780         if (IS_ERR(dp->power)) {
 781                 rc = PTR_ERR(dp->power);
 782                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 783                 dp->power = NULL;
 784                 goto error;
 785         }
 786
 787         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 788         if (IS_ERR(dp->aux)) {
 789                 rc = PTR_ERR(dp->aux);
 790                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 791                 dp->aux = NULL;
 792                 goto error;
 793         }
 794
 795         dp->link = dp_link_get(dev, dp->aux);
 796         if (IS_ERR(dp->link)) {
 797                 rc = PTR_ERR(dp->link);
 798                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 799                 dp->link = NULL;
 800                 goto error_link;
 801         }
 802
 803         panel_in.aux = dp->aux;
 804         panel_in.catalog = dp->catalog;
 805         panel_in.link = dp->link;
 806
 807         dp->panel = dp_panel_get(&panel_in);
 808         if (IS_ERR(dp->panel)) {
 809                 rc = PTR_ERR(dp->panel);
 810                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 811                 dp->panel = NULL;
 812                 goto error_link;
 813         }
 814
 815         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 816                                dp->power, dp->catalog, dp->parser);
 817         if (IS_ERR(dp->ctrl)) {
 818                 rc = PTR_ERR(dp->ctrl);
 819                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 820                 dp->ctrl = NULL;
 821                 goto error_ctrl;
 822         }
 823
 824         dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
 825         if (IS_ERR(dp->audio)) {
 826                 rc = PTR_ERR(dp->audio);
 827                 pr_err("failed to initialize audio, rc = %d\n", rc);
 828                 dp->audio = NULL;
 829                 goto error_ctrl;
 830         }
 831
 832         /* populate wide_bus_en to differernt layers */
 833         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 834         dp->catalog->wide_bus_en = dp->wide_bus_en;
 835
 836         return rc;
 837
 838 error_ctrl:
 839         dp_panel_put(dp->panel);
 840 error_link:
 841         dp_aux_put(dp->aux);
 842 error:
 843         return rc;
 844 }
 845
 846 static int dp_display_set_mode(struct msm_dp *dp_display,
 847                                struct dp_display_mode *mode)
 848 {
 849         struct dp_display_private *dp;
 850
 851         dp = container_of(dp_display, struct dp_display_private, dp_display);
 852
 853         dp->panel->dp_mode.drm_mode = mode->drm_mode;
 854         dp->panel->dp_mode.bpp = mode->bpp;
 855         dp->panel->dp_mode.capabilities = mode->capabilities;
 856         dp_panel_init_panel_info(dp->panel);
 857         return 0;
 858 }
 859
 860 static int dp_display_prepare(struct msm_dp *dp_display)
 861 {
 862         return 0;
 863 }
 864
 865 static int dp_display_enable(struct dp_display_private *dp, u32 data)
 866 {
 867         int rc = 0;
 868         struct msm_dp *dp_display = &dp->dp_display;
 869
 870         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 871         if (dp_display->power_on) {
 872                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 873                 return 0;
 874         }
 875
 876         rc = dp_ctrl_on_stream(dp->ctrl, data);
 877         if (!rc)
 878                 dp_display->power_on = true;
 879
 880         return rc;
 881 }
 882
 883 static int dp_display_post_enable(struct msm_dp *dp_display)
 884 {
 885         struct dp_display_private *dp;
 886         u32 rate;
 887
 888         dp = container_of(dp_display, struct dp_display_private, dp_display);
 889
 890         rate = dp->link->link_params.rate;
 891
 892         if (dp->audio_supported) {
 893                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 894                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 895         }
 896
 897         /* signal the connect event late to synchronize video and display */
 898         dp_display_handle_plugged_change(dp_display, true);
 899         return 0;
 900 }
 901
 902 static int dp_display_disable(struct dp_display_private *dp, u32 data)
 903 {
 904         struct msm_dp *dp_display = &dp->dp_display;
 905
 906         if (!dp_display->power_on)
 907                 return 0;
 908
 909         /* wait only if audio was enabled */
 910         if (dp_display->audio_enabled) {
 911                 /* signal the disconnect event */
 912                 dp_display_handle_plugged_change(dp_display, false);
 913                 if (!wait_for_completion_timeout(&dp->audio_comp,
 914                                 HZ * 5))
 915                         DRM_ERROR("audio comp timeout\n");
 916         }
 917
 918         dp_display->audio_enabled = false;
 919
 920         if (dp->link->sink_count == 0) {
 921                 /*
 922                  * irq_hpd with sink_count = 0
 923                  * hdmi unplugged out of dongle
 924                  */
 925                 dp_ctrl_off_link_stream(dp->ctrl);
 926         } else {
 927                 /*
 928                  * unplugged interrupt
 929                  * dongle unplugged out of DUT
 930                  */
 931                 dp_ctrl_off(dp->ctrl);
 932                 dp_display_host_phy_exit(dp);
 933         }
 934
 935         dp_display->power_on = false;
 936
 937         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 938         return 0;
 939 }
 940
 941 static int dp_display_unprepare(struct msm_dp *dp_display)
 942 {
 943         return 0;
 944 }
 945
 946 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 947                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 948 {
 949         bool plugged;
 950
 951         dp_display->plugged_cb = fn;
 952         dp_display->codec_dev = codec_dev;
 953         plugged = dp_display->is_connected;
 954         dp_display_handle_plugged_change(dp_display, plugged);
 955
 956         return 0;
 957 }
 958
 959 /**
 960  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 961  * @bridge: Pointer to drm bridge structure
 962  * @info: display info
 963  * @mode: Pointer to drm mode structure
 964  * Returns: Validity status for specified mode
 965  */
 966 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 967                                           const struct drm_display_info *info,
 968                                           const struct drm_display_mode *mode)
 969 {
 970         const u32 num_components = 3, default_bpp = 24;
 971         struct dp_display_private *dp_display;
 972         struct dp_link_info *link_info;
 973         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 974         struct msm_dp *dp;
 975         int mode_pclk_khz = mode->clock;
 976
 977         dp = to_dp_bridge(bridge)->dp_display;
 978
 979         if (!dp || !mode_pclk_khz || !dp->connector) {
 980                 DRM_ERROR("invalid params\n");
 981                 return -EINVAL;
 982         }
 983
 984         /*
 985          * The eDP controller currently does not have a reliable way of
 986          * enabling panel power to read sink capabilities. So, we rely
 987          * on the panel driver to populate only supported modes for now.
 988          */
 989         if (dp->is_edp)
 990                 return MODE_OK;
 991
 992         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 993                 return MODE_BAD;
 994
 995         dp_display = container_of(dp, struct dp_display_private, dp_display);
 996         link_info = &dp_display->panel->link_info;
 997
 998         mode_bpp = dp->connector->display_info.bpc * num_components;
 999         if (!mode_bpp)
1000                 mode_bpp = default_bpp;
1001
1002         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
1003                         mode_bpp, mode_pclk_khz);
1004
1005         mode_rate_khz = mode_pclk_khz * mode_bpp;
1006         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
1007
1008         if (mode_rate_khz > supported_rate_khz)
1009                 return MODE_BAD;
1010
1011         return MODE_OK;
1012 }
1013
1014 int dp_display_get_modes(struct msm_dp *dp)
1015 {
1016         struct dp_display_private *dp_display;
1017
1018         if (!dp) {
1019                 DRM_ERROR("invalid params\n");
1020                 return 0;
1021         }
1022
1023         dp_display = container_of(dp, struct dp_display_private, dp_display);
1024
1025         return dp_panel_get_modes(dp_display->panel,
1026                 dp->connector);
1027 }
1028
1029 bool dp_display_check_video_test(struct msm_dp *dp)
1030 {
1031         struct dp_display_private *dp_display;
1032
1033         dp_display = container_of(dp, struct dp_display_private, dp_display);
1034
1035         return dp_display->panel->video_test;
1036 }
1037
1038 int dp_display_get_test_bpp(struct msm_dp *dp)
1039 {
1040         struct dp_display_private *dp_display;
1041
1042         if (!dp) {
1043                 DRM_ERROR("invalid params\n");
1044                 return 0;
1045         }
1046
1047         dp_display = container_of(dp, struct dp_display_private, dp_display);
1048
1049         return dp_link_bit_depth_to_bpp(
1050                 dp_display->link->test_video.test_bit_depth);
1051 }
1052
1053 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1054 {
1055         struct dp_display_private *dp_display;
1056
1057         dp_display = container_of(dp, struct dp_display_private, dp_display);
1058
1059         /*
1060          * if we are reading registers we need the link clocks to be on
1061          * however till DP cable is connected this will not happen as we
1062          * do not know the resolution to power up with. Hence check the
1063          * power_on status before dumping DP registers to avoid crash due
1064          * to unclocked access
1065          */
1066         mutex_lock(&dp_display->event_mutex);
1067
1068         if (!dp->power_on) {
1069                 mutex_unlock(&dp_display->event_mutex);
1070                 return;
1071         }
1072
1073         dp_catalog_snapshot(dp_display->catalog, disp_state);
1074
1075         mutex_unlock(&dp_display->event_mutex);
1076 }
1077
1078 static void dp_display_config_hpd(struct dp_display_private *dp)
1079 {
1080
1081         dp_display_host_init(dp);
1082         dp_catalog_ctrl_hpd_config(dp->catalog);
1083
1084         /* Enable plug and unplug interrupts only for external DisplayPort */
1085         if (!dp->dp_display.is_edp)
1086                 dp_catalog_hpd_config_intr(dp->catalog,
1087                                 DP_DP_HPD_PLUG_INT_MASK |
1088                                 DP_DP_HPD_UNPLUG_INT_MASK,
1089                                 true);
1090
1091         /* Enable interrupt first time
1092          * we are leaving dp clocks on during disconnect
1093          * and never disable interrupt
1094          */
1095         enable_irq(dp->irq);
1096 }
1097
1098 static int hpd_event_thread(void *data)
1099 {
1100         struct dp_display_private *dp_priv;
1101         unsigned long flag;
1102         struct dp_event *todo;
1103         int timeout_mode = 0;
1104
1105         dp_priv = (struct dp_display_private *)data;
1106
1107         while (1) {
1108                 if (timeout_mode) {
1109                         wait_event_timeout(dp_priv->event_q,
1110                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1111                                         kthread_should_stop(), EVENT_TIMEOUT);
1112                 } else {
1113                         wait_event_interruptible(dp_priv->event_q,
1114                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1115                                         kthread_should_stop());
1116                 }
1117
1118                 if (kthread_should_stop())
1119                         break;
1120
1121                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1122                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1123                 if (todo->delay) {
1124                         struct dp_event *todo_next;
1125
1126                         dp_priv->event_gndx++;
1127                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1128
1129                         /* re enter delay event into q */
1130                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1131                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1132                         todo_next->event_id = todo->event_id;
1133                         todo_next->data = todo->data;
1134                         todo_next->delay = todo->delay - 1;
1135
1136                         /* clean up older event */
1137                         todo->event_id = EV_NO_EVENT;
1138                         todo->delay = 0;
1139
1140                         /* switch to timeout mode */
1141                         timeout_mode = 1;
1142                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1143                         continue;
1144                 }
1145
1146                 /* timeout with no events in q */
1147                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1148                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1149                         continue;
1150                 }
1151
1152                 dp_priv->event_gndx++;
1153                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1154                 timeout_mode = 0;
1155                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1156
1157                 switch (todo->event_id) {
1158                 case EV_HPD_INIT_SETUP:
1159                         dp_display_config_hpd(dp_priv);
1160                         break;
1161                 case EV_HPD_PLUG_INT:
1162                         dp_hpd_plug_handle(dp_priv, todo->data);
1163                         break;
1164                 case EV_HPD_UNPLUG_INT:
1165                         dp_hpd_unplug_handle(dp_priv, todo->data);
1166                         break;
1167                 case EV_IRQ_HPD_INT:
1168                         dp_irq_hpd_handle(dp_priv, todo->data);
1169                         break;
1170                 case EV_USER_NOTIFICATION:
1171                         dp_display_send_hpd_notification(dp_priv,
1172                                                 todo->data);
1173                         break;
1174                 default:
1175                         break;
1176                 }
1177         }
1178
1179         return 0;
1180 }
1181
1182 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1183 {
1184         /* set event q to empty */
1185         dp_priv->event_gndx = 0;
1186         dp_priv->event_pndx = 0;
1187
1188         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1189         if (IS_ERR(dp_priv->ev_tsk))
1190                 return PTR_ERR(dp_priv->ev_tsk);
1191
1192         return 0;
1193 }
1194
1195 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1196 {
1197         struct dp_display_private *dp = dev_id;
1198         irqreturn_t ret = IRQ_HANDLED;
1199         u32 hpd_isr_status;
1200
1201         if (!dp) {
1202                 DRM_ERROR("invalid data\n");
1203                 return IRQ_NONE;
1204         }
1205
1206         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1207
1208         if (hpd_isr_status & 0x0F) {
1209                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1210                         dp->dp_display.connector_type, hpd_isr_status);
1211                 /* hpd related interrupts */
1212                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1213                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1214
1215                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1216                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1217                 }
1218
1219                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1220                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1221                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1222                 }
1223
1224                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1225                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1226         }
1227
1228         /* DP controller isr */
1229         dp_ctrl_isr(dp->ctrl);
1230
1231         /* DP aux isr */
1232         dp_aux_isr(dp->aux);
1233
1234         return ret;
1235 }
1236
1237 int dp_display_request_irq(struct msm_dp *dp_display)
1238 {
1239         int rc = 0;
1240         struct dp_display_private *dp;
1241
1242         if (!dp_display) {
1243                 DRM_ERROR("invalid input\n");
1244                 return -EINVAL;
1245         }
1246
1247         dp = container_of(dp_display, struct dp_display_private, dp_display);
1248
1249         dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1250         if (!dp->irq) {
1251                 DRM_ERROR("failed to get irq\n");
1252                 return -EINVAL;
1253         }
1254
1255         rc = devm_request_irq(&dp->pdev->dev, dp->irq,
1256                         dp_display_irq_handler,
1257                         IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1258         if (rc < 0) {
1259                 DRM_ERROR("failed to request IRQ%u: %d\n",
1260                                 dp->irq, rc);
1261                 return rc;
1262         }
1263         disable_irq(dp->irq);
1264
1265         return 0;
1266 }
1267
1268 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev,
1269                                                      unsigned int *id)
1270 {
1271         const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
1272         struct resource *res;
1273         int i;
1274
1275         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1276         if (!res)
1277                 return NULL;
1278
1279         for (i = 0; i < cfg->num_descs; i++) {
1280                 if (cfg->descs[i].io_start == res->start) {
1281                         *id = i;
1282                         return &cfg->descs[i];
1283                 }
1284         }
1285
1286         dev_err(&pdev->dev, "unknown displayport instance\n");
1287         return NULL;
1288 }
1289
1290 static int dp_display_probe(struct platform_device *pdev)
1291 {
1292         int rc = 0;
1293         struct dp_display_private *dp;
1294         const struct msm_dp_desc *desc;
1295
1296         if (!pdev || !pdev->dev.of_node) {
1297                 DRM_ERROR("pdev not found\n");
1298                 return -ENODEV;
1299         }
1300
1301         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1302         if (!dp)
1303                 return -ENOMEM;
1304
1305         desc = dp_display_get_desc(pdev, &dp->id);
1306         if (!desc)
1307                 return -EINVAL;
1308
1309         dp->pdev = pdev;
1310         dp->name = "drm_dp";
1311         dp->dp_display.connector_type = desc->connector_type;
1312         dp->wide_bus_en = desc->wide_bus_en;
1313         dp->dp_display.is_edp =
1314                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1315
1316         rc = dp_init_sub_modules(dp);
1317         if (rc) {
1318                 DRM_ERROR("init sub module failed\n");
1319                 return -EPROBE_DEFER;
1320         }
1321
1322         /* setup event q */
1323         mutex_init(&dp->event_mutex);
1324         init_waitqueue_head(&dp->event_q);
1325         spin_lock_init(&dp->event_lock);
1326
1327         /* Store DP audio handle inside DP display */
1328         dp->dp_display.dp_audio = dp->audio;
1329
1330         init_completion(&dp->audio_comp);
1331
1332         platform_set_drvdata(pdev, &dp->dp_display);
1333
1334         rc = component_add(&pdev->dev, &dp_display_comp_ops);
1335         if (rc) {
1336                 DRM_ERROR("component add failed, rc=%d\n", rc);
1337                 dp_display_deinit_sub_modules(dp);
1338         }
1339
1340         return rc;
1341 }
1342
1343 static int dp_display_remove(struct platform_device *pdev)
1344 {
1345         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1346
1347         dp_display_deinit_sub_modules(dp);
1348
1349         component_del(&pdev->dev, &dp_display_comp_ops);
1350         platform_set_drvdata(pdev, NULL);
1351
1352         return 0;
1353 }
1354
1355 static int dp_pm_resume(struct device *dev)
1356 {
1357         struct platform_device *pdev = to_platform_device(dev);
1358         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1359         struct dp_display_private *dp;
1360         int sink_count = 0;
1361
1362         dp = container_of(dp_display, struct dp_display_private, dp_display);
1363
1364         mutex_lock(&dp->event_mutex);
1365
1366         drm_dbg_dp(dp->drm_dev,
1367                 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1368                 dp->dp_display.connector_type, dp->core_initialized,
1369                 dp->phy_initialized, dp_display->power_on);
1370
1371         /* start from disconnected state */
1372         dp->hpd_state = ST_DISCONNECTED;
1373
1374         /* turn on dp ctrl/phy */
1375         dp_display_host_init(dp);
1376
1377         dp_catalog_ctrl_hpd_config(dp->catalog);
1378
1379
1380         if (!dp->dp_display.is_edp)
1381                 dp_catalog_hpd_config_intr(dp->catalog,
1382                                 DP_DP_HPD_PLUG_INT_MASK |
1383                                 DP_DP_HPD_UNPLUG_INT_MASK,
1384                                 true);
1385
1386         if (dp_catalog_link_is_connected(dp->catalog)) {
1387                 /*
1388                  * set sink to normal operation mode -- D0
1389                  * before dpcd read
1390                  */
1391                 dp_display_host_phy_init(dp);
1392                 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1393                 sink_count = drm_dp_read_sink_count(dp->aux);
1394                 if (sink_count < 0)
1395                         sink_count = 0;
1396
1397                 dp_display_host_phy_exit(dp);
1398         }
1399
1400         dp->link->sink_count = sink_count;
1401         /*
1402          * can not declared display is connected unless
1403          * HDMI cable is plugged in and sink_count of
1404          * dongle become 1
1405          * also only signal audio when disconnected
1406          */
1407         if (dp->link->sink_count) {
1408                 dp->dp_display.is_connected = true;
1409         } else {
1410                 dp->dp_display.is_connected = false;
1411                 dp_display_handle_plugged_change(dp_display, false);
1412         }
1413
1414         drm_dbg_dp(dp->drm_dev,
1415                 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1416                 dp->dp_display.connector_type, dp->link->sink_count,
1417                 dp->dp_display.is_connected, dp->core_initialized,
1418                 dp->phy_initialized, dp_display->power_on);
1419
1420         mutex_unlock(&dp->event_mutex);
1421
1422         return 0;
1423 }
1424
1425 static int dp_pm_suspend(struct device *dev)
1426 {
1427         struct platform_device *pdev = to_platform_device(dev);
1428         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1429         struct dp_display_private *dp;
1430
1431         dp = container_of(dp_display, struct dp_display_private, dp_display);
1432
1433         mutex_lock(&dp->event_mutex);
1434
1435         drm_dbg_dp(dp->drm_dev,
1436                 "Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
1437                 dp->dp_display.connector_type, dp->core_initialized,
1438                 dp->phy_initialized, dp_display->power_on);
1439
1440         /* mainlink enabled */
1441         if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1442                 dp_ctrl_off_link_stream(dp->ctrl);
1443
1444         dp_display_host_phy_exit(dp);
1445
1446         /* host_init will be called at pm_resume */
1447         dp_display_host_deinit(dp);
1448
1449         dp->hpd_state = ST_SUSPENDED;
1450
1451         drm_dbg_dp(dp->drm_dev,
1452                 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1453                 dp->dp_display.connector_type, dp->core_initialized,
1454                 dp->phy_initialized, dp_display->power_on);
1455
1456         mutex_unlock(&dp->event_mutex);
1457
1458         return 0;
1459 }
1460
1461 static int dp_pm_prepare(struct device *dev)
1462 {
1463         return 0;
1464 }
1465
1466 static void dp_pm_complete(struct device *dev)
1467 {
1468
1469 }
1470
1471 static const struct dev_pm_ops dp_pm_ops = {
1472         .suspend = dp_pm_suspend,
1473         .resume =  dp_pm_resume,
1474         .prepare = dp_pm_prepare,
1475         .complete = dp_pm_complete,
1476 };
1477
1478 static struct platform_driver dp_display_driver = {
1479         .probe  = dp_display_probe,
1480         .remove = dp_display_remove,
1481         .driver = {
1482                 .name = "msm-dp-display",
1483                 .of_match_table = dp_dt_match,
1484                 .suppress_bind_attrs = true,
1485                 .pm = &dp_pm_ops,
1486         },
1487 };
1488
1489 int __init msm_dp_register(void)
1490 {
1491         int ret;
1492
1493         ret = platform_driver_register(&dp_display_driver);
1494         if (ret)
1495                 DRM_ERROR("Dp display driver register failed");
1496
1497         return ret;
1498 }
1499
1500 void __exit msm_dp_unregister(void)
1501 {
1502         platform_driver_unregister(&dp_display_driver);
1503 }
1504
1505 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1506 {
1507         struct dp_display_private *dp;
1508
1509         if (!dp_display)
1510                 return;
1511
1512         dp = container_of(dp_display, struct dp_display_private, dp_display);
1513
1514         if (!dp_display->is_edp)
1515                 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
1516 }
1517
1518 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1519 {
1520         struct dp_display_private *dp;
1521
1522         dp = container_of(dp_display, struct dp_display_private, dp_display);
1523
1524         return dp->wide_bus_en;
1525 }
1526
1527 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1528 {
1529         struct dp_display_private *dp;
1530         struct device *dev;
1531         int rc;
1532
1533         dp = container_of(dp_display, struct dp_display_private, dp_display);
1534         dev = &dp->pdev->dev;
1535
1536         dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
1537                                         dp->link, dp->dp_display.connector,
1538                                         minor);
1539         if (IS_ERR(dp->debug)) {
1540                 rc = PTR_ERR(dp->debug);
1541                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1542                 dp->debug = NULL;
1543         }
1544 }
1545
1546 static int dp_display_get_next_bridge(struct msm_dp *dp)
1547 {
1548         int rc;
1549         struct dp_display_private *dp_priv;
1550         struct device_node *aux_bus;
1551         struct device *dev;
1552
1553         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1554         dev = &dp_priv->pdev->dev;
1555         aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1556
1557         if (aux_bus && dp->is_edp) {
1558                 dp_display_host_init(dp_priv);
1559                 dp_catalog_ctrl_hpd_config(dp_priv->catalog);
1560                 dp_display_host_phy_init(dp_priv);
1561                 enable_irq(dp_priv->irq);
1562
1563                 /*
1564                  * The code below assumes that the panel will finish probing
1565                  * by the time devm_of_dp_aux_populate_ep_devices() returns.
1566                  * This isn't a great assumption since it will fail if the
1567                  * panel driver is probed asynchronously but is the best we
1568                  * can do without a bigger driver reorganization.
1569                  */
1570                 rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux);
1571                 of_node_put(aux_bus);
1572                 if (rc)
1573                         goto error;
1574         } else if (dp->is_edp) {
1575                 DRM_ERROR("eDP aux_bus not found\n");
1576                 return -ENODEV;
1577         }
1578
1579         /*
1580          * External bridges are mandatory for eDP interfaces: one has to
1581          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1582          *
1583          * For DisplayPort interfaces external bridges are optional, so
1584          * silently ignore an error if one is not present (-ENODEV).
1585          */
1586         rc = dp_parser_find_next_bridge(dp_priv->parser);
1587         if (!dp->is_edp && rc == -ENODEV)
1588                 return 0;
1589
1590         if (!rc) {
1591                 dp->next_bridge = dp_priv->parser->next_bridge;
1592                 return 0;
1593         }
1594
1595 error:
1596         if (dp->is_edp) {
1597                 disable_irq(dp_priv->irq);
1598                 dp_display_host_phy_exit(dp_priv);
1599                 dp_display_host_deinit(dp_priv);
1600         }
1601         return rc;
1602 }
1603
1604 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1605                         struct drm_encoder *encoder)
1606 {
1607         struct msm_drm_private *priv;
1608         struct dp_display_private *dp_priv;
1609         int ret;
1610
1611         if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
1612                 return -EINVAL;
1613
1614         priv = dev->dev_private;
1615         dp_display->drm_dev = dev;
1616
1617         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1618
1619         ret = dp_display_request_irq(dp_display);
1620         if (ret) {
1621                 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1622                 return ret;
1623         }
1624
1625         dp_display->encoder = encoder;
1626
1627         ret = dp_display_get_next_bridge(dp_display);
1628         if (ret)
1629                 return ret;
1630
1631         dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1632         if (IS_ERR(dp_display->bridge)) {
1633                 ret = PTR_ERR(dp_display->bridge);
1634                 DRM_DEV_ERROR(dev->dev,
1635                         "failed to create dp bridge: %d\n", ret);
1636                 dp_display->bridge = NULL;
1637                 return ret;
1638         }
1639
1640         priv->bridges[priv->num_bridges++] = dp_display->bridge;
1641
1642         dp_display->connector = dp_drm_connector_init(dp_display);
1643         if (IS_ERR(dp_display->connector)) {
1644                 ret = PTR_ERR(dp_display->connector);
1645                 DRM_DEV_ERROR(dev->dev,
1646                         "failed to create dp connector: %d\n", ret);
1647                 dp_display->connector = NULL;
1648                 return ret;
1649         }
1650
1651         dp_priv->panel->connector = dp_display->connector;
1652
1653         return 0;
1654 }
1655
1656 void dp_bridge_enable(struct drm_bridge *drm_bridge)
1657 {
1658         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1659         struct msm_dp *dp = dp_bridge->dp_display;
1660         int rc = 0;
1661         struct dp_display_private *dp_display;
1662         u32 state;
1663         bool force_link_train = false;
1664
1665         dp_display = container_of(dp, struct dp_display_private, dp_display);
1666         if (!dp_display->dp_mode.drm_mode.clock) {
1667                 DRM_ERROR("invalid params\n");
1668                 return;
1669         }
1670
1671         if (dp->is_edp)
1672                 dp_hpd_plug_handle(dp_display, 0);
1673
1674         mutex_lock(&dp_display->event_mutex);
1675
1676         state = dp_display->hpd_state;
1677         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1678                 mutex_unlock(&dp_display->event_mutex);
1679                 return;
1680         }
1681
1682         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1683         if (rc) {
1684                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1685                 mutex_unlock(&dp_display->event_mutex);
1686                 return;
1687         }
1688
1689         rc = dp_display_prepare(dp);
1690         if (rc) {
1691                 DRM_ERROR("DP display prepare failed, rc=%d\n", rc);
1692                 mutex_unlock(&dp_display->event_mutex);
1693                 return;
1694         }
1695
1696         state =  dp_display->hpd_state;
1697
1698         if (state == ST_DISPLAY_OFF) {
1699                 dp_display_host_phy_init(dp_display);
1700                 force_link_train = true;
1701         }
1702
1703         dp_display_enable(dp_display, force_link_train);
1704
1705         rc = dp_display_post_enable(dp);
1706         if (rc) {
1707                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1708                 dp_display_disable(dp_display, 0);
1709                 dp_display_unprepare(dp);
1710         }
1711
1712         /* completed connection */
1713         dp_display->hpd_state = ST_CONNECTED;
1714
1715         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1716         mutex_unlock(&dp_display->event_mutex);
1717 }
1718
1719 void dp_bridge_disable(struct drm_bridge *drm_bridge)
1720 {
1721         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1722         struct msm_dp *dp = dp_bridge->dp_display;
1723         struct dp_display_private *dp_display;
1724
1725         dp_display = container_of(dp, struct dp_display_private, dp_display);
1726
1727         dp_ctrl_push_idle(dp_display->ctrl);
1728 }
1729
1730 void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
1731 {
1732         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1733         struct msm_dp *dp = dp_bridge->dp_display;
1734         int rc = 0;
1735         u32 state;
1736         struct dp_display_private *dp_display;
1737
1738         dp_display = container_of(dp, struct dp_display_private, dp_display);
1739
1740         if (dp->is_edp)
1741                 dp_hpd_unplug_handle(dp_display, 0);
1742
1743         mutex_lock(&dp_display->event_mutex);
1744
1745         state = dp_display->hpd_state;
1746         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1747                 mutex_unlock(&dp_display->event_mutex);
1748                 return;
1749         }
1750
1751         dp_display_disable(dp_display, 0);
1752
1753         rc = dp_display_unprepare(dp);
1754         if (rc)
1755                 DRM_ERROR("DP display unprepare failed, rc=%d\n", rc);
1756
1757         state =  dp_display->hpd_state;
1758         if (state == ST_DISCONNECT_PENDING) {
1759                 /* completed disconnection */
1760                 dp_display->hpd_state = ST_DISCONNECTED;
1761         } else {
1762                 dp_display->hpd_state = ST_DISPLAY_OFF;
1763         }
1764
1765         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1766         mutex_unlock(&dp_display->event_mutex);
1767 }
1768
1769 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1770                         const struct drm_display_mode *mode,
1771                         const struct drm_display_mode *adjusted_mode)
1772 {
1773         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1774         struct msm_dp *dp = dp_bridge->dp_display;
1775         struct dp_display_private *dp_display;
1776
1777         dp_display = container_of(dp, struct dp_display_private, dp_display);
1778
1779         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1780
1781         if (dp_display_check_video_test(dp))
1782                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1783         else /* Default num_components per pixel = 3 */
1784                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1785
1786         if (!dp_display->dp_mode.bpp)
1787                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1788
1789         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1790
1791         dp_display->dp_mode.v_active_low =
1792                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1793
1794         dp_display->dp_mode.h_active_low =
1795                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1796 }