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_desc sc7180_dp_descs[] = {
 135         [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 136 };
 137
 138 static const struct msm_dp_config sc7180_dp_cfg = {
 139         .descs = sc7180_dp_descs,
 140         .num_descs = ARRAY_SIZE(sc7180_dp_descs),
 141 };
 142
 143 static const struct msm_dp_desc sc7280_dp_descs[] = {
 144         [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 145         [MSM_DP_CONTROLLER_1] = { .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 146 };
 147
 148 static const struct msm_dp_config sc7280_dp_cfg = {
 149         .descs = sc7280_dp_descs,
 150         .num_descs = ARRAY_SIZE(sc7280_dp_descs),
 151 };
 152
 153 static const struct msm_dp_desc sc8180x_dp_descs[] = {
 154         [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 155         [MSM_DP_CONTROLLER_1] = { .io_start = 0x0ae98000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 156         [MSM_DP_CONTROLLER_2] = { .io_start = 0x0ae9a000, .connector_type = DRM_MODE_CONNECTOR_eDP },
 157 };
 158
 159 static const struct msm_dp_config sc8180x_dp_cfg = {
 160         .descs = sc8180x_dp_descs,
 161         .num_descs = ARRAY_SIZE(sc8180x_dp_descs),
 162 };
 163
 164 static const struct msm_dp_desc sm8350_dp_descs[] = {
 165         [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 166 };
 167
 168 static const struct msm_dp_config sm8350_dp_cfg = {
 169         .descs = sm8350_dp_descs,
 170         .num_descs = ARRAY_SIZE(sm8350_dp_descs),
 171 };
 172
 173 static const struct of_device_id dp_dt_match[] = {
 174         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
 175         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_cfg },
 176         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_cfg },
 177         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_cfg },
 178         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_cfg },
 179         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_cfg },
 180         {}
 181 };
 182
 183 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 184 {
 185         struct msm_dp *dp = dev_get_drvdata(dev);
 186
 187         return container_of(dp, struct dp_display_private, dp_display);
 188 }
 189
 190 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 191                                                 u32 data, u32 delay)
 192 {
 193         unsigned long flag;
 194         struct dp_event *todo;
 195         int pndx;
 196
 197         spin_lock_irqsave(&dp_priv->event_lock, flag);
 198         pndx = dp_priv->event_pndx + 1;
 199         pndx %= DP_EVENT_Q_MAX;
 200         if (pndx == dp_priv->event_gndx) {
 201                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 202                         dp_priv->event_pndx, dp_priv->event_gndx);
 203                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 204                 return -EPERM;
 205         }
 206         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 207         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 208         todo->event_id = event;
 209         todo->data = data;
 210         todo->delay = delay;
 211         wake_up(&dp_priv->event_q);
 212         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 213
 214         return 0;
 215 }
 216
 217 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 218 {
 219         unsigned long flag;
 220         struct dp_event *todo;
 221         u32     gndx;
 222
 223         spin_lock_irqsave(&dp_priv->event_lock, flag);
 224         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 225                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 226                 return -ENOENT;
 227         }
 228
 229         gndx = dp_priv->event_gndx;
 230         while (dp_priv->event_pndx != gndx) {
 231                 todo = &dp_priv->event_list[gndx];
 232                 if (todo->event_id == event) {
 233                         todo->event_id = EV_NO_EVENT;   /* deleted */
 234                         todo->delay = 0;
 235                 }
 236                 gndx++;
 237                 gndx %= DP_EVENT_Q_MAX;
 238         }
 239         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 240
 241         return 0;
 242 }
 243
 244 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 245 {
 246         struct dp_display_private *dp;
 247
 248         dp = container_of(dp_display, struct dp_display_private, dp_display);
 249
 250         reinit_completion(&dp->audio_comp);
 251 }
 252
 253 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 254 {
 255         struct dp_display_private *dp;
 256
 257         dp = container_of(dp_display, struct dp_display_private, dp_display);
 258
 259         complete_all(&dp->audio_comp);
 260 }
 261
 262 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 263
 264 static int dp_display_bind(struct device *dev, struct device *master,
 265                            void *data)
 266 {
 267         int rc = 0;
 268         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 269         struct msm_drm_private *priv = dev_get_drvdata(master);
 270         struct drm_device *drm = priv->dev;
 271
 272         dp->dp_display.drm_dev = drm;
 273         priv->dp[dp->id] = &dp->dp_display;
 274
 275         rc = dp->parser->parse(dp->parser);
 276         if (rc) {
 277                 DRM_ERROR("device tree parsing failed\n");
 278                 goto end;
 279         }
 280
 281
 282         dp->drm_dev = drm;
 283         dp->aux->drm_dev = drm;
 284         rc = dp_aux_register(dp->aux);
 285         if (rc) {
 286                 DRM_ERROR("DRM DP AUX register failed\n");
 287                 goto end;
 288         }
 289
 290         rc = dp_power_client_init(dp->power);
 291         if (rc) {
 292                 DRM_ERROR("Power client create failed\n");
 293                 goto end;
 294         }
 295
 296         rc = dp_register_audio_driver(dev, dp->audio);
 297         if (rc) {
 298                 DRM_ERROR("Audio registration Dp failed\n");
 299                 goto end;
 300         }
 301
 302         rc = dp_hpd_event_thread_start(dp);
 303         if (rc) {
 304                 DRM_ERROR("Event thread create failed\n");
 305                 goto end;
 306         }
 307
 308         return 0;
 309 end:
 310         return rc;
 311 }
 312
 313 static void dp_display_unbind(struct device *dev, struct device *master,
 314                               void *data)
 315 {
 316         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 317         struct msm_drm_private *priv = dev_get_drvdata(master);
 318
 319         /* disable all HPD interrupts */
 320         if (dp->core_initialized)
 321                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
 322
 323         kthread_stop(dp->ev_tsk);
 324
 325         dp_power_client_deinit(dp->power);
 326         dp_aux_unregister(dp->aux);
 327         dp->drm_dev = NULL;
 328         dp->aux->drm_dev = NULL;
 329         priv->dp[dp->id] = NULL;
 330 }
 331
 332 static const struct component_ops dp_display_comp_ops = {
 333         .bind = dp_display_bind,
 334         .unbind = dp_display_unbind,
 335 };
 336
 337 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
 338 {
 339         return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
 340                 DP_DWN_STRM_PORT_PRESENT);
 341 }
 342
 343 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
 344 {
 345         drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
 346                         dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
 347                 dp->link->sink_count);
 348         return dp_display_is_ds_bridge(dp->panel) &&
 349                 (dp->link->sink_count == 0);
 350 }
 351
 352 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 353 {
 354         struct dp_display_private *dp;
 355         struct drm_connector *connector;
 356
 357         dp = container_of(dp_display, struct dp_display_private, dp_display);
 358
 359         connector = dp->dp_display.connector;
 360         drm_helper_hpd_irq_event(connector->dev);
 361 }
 362
 363
 364 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 365                                             bool hpd)
 366 {
 367         if ((hpd && dp->dp_display.is_connected) ||
 368                         (!hpd && !dp->dp_display.is_connected)) {
 369                 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 370                                 (hpd ? "on" : "off"));
 371                 return 0;
 372         }
 373
 374         /* reset video pattern flag on disconnect */
 375         if (!hpd)
 376                 dp->panel->video_test = false;
 377
 378         dp->dp_display.is_connected = hpd;
 379
 380         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 381                         dp->dp_display.connector_type, hpd);
 382         dp_display_send_hpd_event(&dp->dp_display);
 383
 384         return 0;
 385 }
 386
 387 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 388 {
 389         int rc = 0;
 390         struct edid *edid;
 391
 392         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 393
 394         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 395         if (rc)
 396                 goto end;
 397
 398         dp_link_process_request(dp->link);
 399
 400         edid = dp->panel->edid;
 401
 402         dp->audio_supported = drm_detect_monitor_audio(edid);
 403         dp_panel_handle_sink_request(dp->panel);
 404
 405         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 406
 407         /*
 408          * set sink to normal operation mode -- D0
 409          * before dpcd read
 410          */
 411         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 412
 413         dp_link_reset_phy_params_vx_px(dp->link);
 414         rc = dp_ctrl_on_link(dp->ctrl);
 415         if (rc) {
 416                 DRM_ERROR("failed to complete DP link training\n");
 417                 goto end;
 418         }
 419
 420         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 421
 422 end:
 423         return rc;
 424 }
 425
 426 static void dp_display_host_phy_init(struct dp_display_private *dp)
 427 {
 428         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 429                 dp->dp_display.connector_type, dp->core_initialized,
 430                 dp->phy_initialized);
 431
 432         if (!dp->phy_initialized) {
 433                 dp_ctrl_phy_init(dp->ctrl);
 434                 dp->phy_initialized = true;
 435         }
 436 }
 437
 438 static void dp_display_host_phy_exit(struct dp_display_private *dp)
 439 {
 440         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 441                 dp->dp_display.connector_type, dp->core_initialized,
 442                 dp->phy_initialized);
 443
 444         if (dp->phy_initialized) {
 445                 dp_ctrl_phy_exit(dp->ctrl);
 446                 dp->phy_initialized = false;
 447         }
 448 }
 449
 450 static void dp_display_host_init(struct dp_display_private *dp)
 451 {
 452         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 453                 dp->dp_display.connector_type, dp->core_initialized,
 454                 dp->phy_initialized);
 455
 456         dp_power_init(dp->power, false);
 457         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 458         dp_aux_init(dp->aux);
 459         dp->core_initialized = true;
 460 }
 461
 462 static void dp_display_host_deinit(struct dp_display_private *dp)
 463 {
 464         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 465                 dp->dp_display.connector_type, dp->core_initialized,
 466                 dp->phy_initialized);
 467
 468         dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
 469         dp_aux_deinit(dp->aux);
 470         dp_power_deinit(dp->power);
 471         dp->core_initialized = false;
 472 }
 473
 474 static int dp_display_usbpd_configure_cb(struct device *dev)
 475 {
 476         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 477
 478         dp_display_host_phy_init(dp);
 479
 480         return dp_display_process_hpd_high(dp);
 481 }
 482
 483 static int dp_display_usbpd_disconnect_cb(struct device *dev)
 484 {
 485         return 0;
 486 }
 487
 488 static int dp_display_notify_disconnect(struct device *dev)
 489 {
 490         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 491
 492         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 493
 494         return 0;
 495 }
 496
 497 static void dp_display_handle_video_request(struct dp_display_private *dp)
 498 {
 499         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 500                 dp->panel->video_test = true;
 501                 dp_link_send_test_response(dp->link);
 502         }
 503 }
 504
 505 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 506 {
 507         int rc = 0;
 508
 509         if (dp_display_is_sink_count_zero(dp)) {
 510                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 511                 if (dp->hpd_state != ST_DISCONNECTED) {
 512                         dp->hpd_state = ST_DISCONNECT_PENDING;
 513                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 514                 }
 515         } else {
 516                 if (dp->hpd_state == ST_DISCONNECTED) {
 517                         dp->hpd_state = ST_MAINLINK_READY;
 518                         rc = dp_display_process_hpd_high(dp);
 519                         if (rc)
 520                                 dp->hpd_state = ST_DISCONNECTED;
 521                 }
 522         }
 523
 524         return rc;
 525 }
 526
 527 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 528 {
 529         u32 sink_request = dp->link->sink_request;
 530
 531         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 532         if (dp->hpd_state == ST_DISCONNECTED) {
 533                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 534                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 535                                                         sink_request);
 536                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 537                         return -EINVAL;
 538                 }
 539         }
 540
 541         dp_ctrl_handle_sink_request(dp->ctrl);
 542
 543         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 544                 dp_display_handle_video_request(dp);
 545
 546         return 0;
 547 }
 548
 549 static int dp_display_usbpd_attention_cb(struct device *dev)
 550 {
 551         int rc = 0;
 552         u32 sink_request;
 553         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 554
 555         /* check for any test request issued by sink */
 556         rc = dp_link_process_request(dp->link);
 557         if (!rc) {
 558                 sink_request = dp->link->sink_request;
 559                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 560                                         dp->hpd_state, sink_request);
 561                 if (sink_request & DS_PORT_STATUS_CHANGED)
 562                         rc = dp_display_handle_port_ststus_changed(dp);
 563                 else
 564                         rc = dp_display_handle_irq_hpd(dp);
 565         }
 566
 567         return rc;
 568 }
 569
 570 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 571 {
 572         struct dp_usbpd *hpd = dp->usbpd;
 573         u32 state;
 574         int ret;
 575
 576         if (!hpd)
 577                 return 0;
 578
 579         mutex_lock(&dp->event_mutex);
 580
 581         state =  dp->hpd_state;
 582         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 583                         dp->dp_display.connector_type, state);
 584
 585         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 586                 mutex_unlock(&dp->event_mutex);
 587                 return 0;
 588         }
 589
 590         if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
 591                 mutex_unlock(&dp->event_mutex);
 592                 return 0;
 593         }
 594
 595         if (state == ST_DISCONNECT_PENDING) {
 596                 /* wait until ST_DISCONNECTED */
 597                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
 598                 mutex_unlock(&dp->event_mutex);
 599                 return 0;
 600         }
 601
 602         ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
 603         if (ret) {      /* link train failed */
 604                 dp->hpd_state = ST_DISCONNECTED;
 605         } else {
 606                 dp->hpd_state = ST_MAINLINK_READY;
 607         }
 608
 609         /* enable HDP irq_hpd/replug interrupt */
 610         dp_catalog_hpd_config_intr(dp->catalog,
 611                 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, true);
 612
 613         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 614                         dp->dp_display.connector_type, state);
 615         mutex_unlock(&dp->event_mutex);
 616
 617         /* uevent will complete connection part */
 618         return 0;
 619 };
 620
 621 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 622                 bool plugged)
 623 {
 624         struct dp_display_private *dp;
 625
 626         dp = container_of(dp_display,
 627                         struct dp_display_private, dp_display);
 628
 629         /* notify audio subsystem only if sink supports audio */
 630         if (dp_display->plugged_cb && dp_display->codec_dev &&
 631                         dp->audio_supported)
 632                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 633 }
 634
 635 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 636 {
 637         struct dp_usbpd *hpd = dp->usbpd;
 638         u32 state;
 639
 640         if (!hpd)
 641                 return 0;
 642
 643         mutex_lock(&dp->event_mutex);
 644
 645         state = dp->hpd_state;
 646
 647         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 648                         dp->dp_display.connector_type, state);
 649
 650         /* disable irq_hpd/replug interrupts */
 651         dp_catalog_hpd_config_intr(dp->catalog,
 652                 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, false);
 653
 654         /* unplugged, no more irq_hpd handle */
 655         dp_del_event(dp, EV_IRQ_HPD_INT);
 656
 657         if (state == ST_DISCONNECTED) {
 658                 /* triggered by irq_hdp with sink_count = 0 */
 659                 if (dp->link->sink_count == 0) {
 660                         dp_display_host_phy_exit(dp);
 661                 }
 662                 dp_display_notify_disconnect(&dp->pdev->dev);
 663                 mutex_unlock(&dp->event_mutex);
 664                 return 0;
 665         } else if (state == ST_DISCONNECT_PENDING) {
 666                 mutex_unlock(&dp->event_mutex);
 667                 return 0;
 668         } else if (state == ST_MAINLINK_READY) {
 669                 dp_ctrl_off_link(dp->ctrl);
 670                 dp_display_host_phy_exit(dp);
 671                 dp->hpd_state = ST_DISCONNECTED;
 672                 dp_display_notify_disconnect(&dp->pdev->dev);
 673                 mutex_unlock(&dp->event_mutex);
 674                 return 0;
 675         }
 676
 677         /* disable HPD plug interrupts */
 678         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
 679
 680         /*
 681          * We don't need separate work for disconnect as
 682          * connect/attention interrupts are disabled
 683          */
 684         dp_display_notify_disconnect(&dp->pdev->dev);
 685
 686         if (state == ST_DISPLAY_OFF) {
 687                 dp->hpd_state = ST_DISCONNECTED;
 688         } else {
 689                 dp->hpd_state = ST_DISCONNECT_PENDING;
 690         }
 691
 692         /* signal the disconnect event early to ensure proper teardown */
 693         dp_display_handle_plugged_change(&dp->dp_display, false);
 694
 695         /* enable HDP plug interrupt to prepare for next plugin */
 696         if (!dp->dp_display.is_edp)
 697                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
 698
 699         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 700                         dp->dp_display.connector_type, state);
 701
 702         /* uevent will complete disconnection part */
 703         mutex_unlock(&dp->event_mutex);
 704         return 0;
 705 }
 706
 707 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 708 {
 709         u32 state;
 710
 711         mutex_lock(&dp->event_mutex);
 712
 713         /* irq_hpd can happen at either connected or disconnected state */
 714         state =  dp->hpd_state;
 715         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 716                         dp->dp_display.connector_type, state);
 717
 718         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 719                 mutex_unlock(&dp->event_mutex);
 720                 return 0;
 721         }
 722
 723         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 724                 /* wait until ST_CONNECTED */
 725                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 726                 mutex_unlock(&dp->event_mutex);
 727                 return 0;
 728         }
 729
 730         dp_display_usbpd_attention_cb(&dp->pdev->dev);
 731
 732         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 733                         dp->dp_display.connector_type, state);
 734
 735         mutex_unlock(&dp->event_mutex);
 736
 737         return 0;
 738 }
 739
 740 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 741 {
 742         dp_debug_put(dp->debug);
 743         dp_audio_put(dp->audio);
 744         dp_panel_put(dp->panel);
 745         dp_aux_put(dp->aux);
 746 }
 747
 748 static int dp_init_sub_modules(struct dp_display_private *dp)
 749 {
 750         int rc = 0;
 751         struct device *dev = &dp->pdev->dev;
 752         struct dp_usbpd_cb *cb = &dp->usbpd_cb;
 753         struct dp_panel_in panel_in = {
 754                 .dev = dev,
 755         };
 756
 757         /* Callback APIs used for cable status change event */
 758         cb->configure  = dp_display_usbpd_configure_cb;
 759         cb->disconnect = dp_display_usbpd_disconnect_cb;
 760         cb->attention  = dp_display_usbpd_attention_cb;
 761
 762         dp->usbpd = dp_hpd_get(dev, cb);
 763         if (IS_ERR(dp->usbpd)) {
 764                 rc = PTR_ERR(dp->usbpd);
 765                 DRM_ERROR("failed to initialize hpd, rc = %d\n", rc);
 766                 dp->usbpd = NULL;
 767                 goto error;
 768         }
 769
 770         dp->parser = dp_parser_get(dp->pdev);
 771         if (IS_ERR(dp->parser)) {
 772                 rc = PTR_ERR(dp->parser);
 773                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 774                 dp->parser = NULL;
 775                 goto error;
 776         }
 777
 778         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 779         if (IS_ERR(dp->catalog)) {
 780                 rc = PTR_ERR(dp->catalog);
 781                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 782                 dp->catalog = NULL;
 783                 goto error;
 784         }
 785
 786         dp->power = dp_power_get(dev, dp->parser);
 787         if (IS_ERR(dp->power)) {
 788                 rc = PTR_ERR(dp->power);
 789                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 790                 dp->power = NULL;
 791                 goto error;
 792         }
 793
 794         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 795         if (IS_ERR(dp->aux)) {
 796                 rc = PTR_ERR(dp->aux);
 797                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 798                 dp->aux = NULL;
 799                 goto error;
 800         }
 801
 802         dp->link = dp_link_get(dev, dp->aux);
 803         if (IS_ERR(dp->link)) {
 804                 rc = PTR_ERR(dp->link);
 805                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 806                 dp->link = NULL;
 807                 goto error_link;
 808         }
 809
 810         panel_in.aux = dp->aux;
 811         panel_in.catalog = dp->catalog;
 812         panel_in.link = dp->link;
 813
 814         dp->panel = dp_panel_get(&panel_in);
 815         if (IS_ERR(dp->panel)) {
 816                 rc = PTR_ERR(dp->panel);
 817                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 818                 dp->panel = NULL;
 819                 goto error_link;
 820         }
 821
 822         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 823                                dp->power, dp->catalog, dp->parser);
 824         if (IS_ERR(dp->ctrl)) {
 825                 rc = PTR_ERR(dp->ctrl);
 826                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 827                 dp->ctrl = NULL;
 828                 goto error_ctrl;
 829         }
 830
 831         dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
 832         if (IS_ERR(dp->audio)) {
 833                 rc = PTR_ERR(dp->audio);
 834                 pr_err("failed to initialize audio, rc = %d\n", rc);
 835                 dp->audio = NULL;
 836                 goto error_ctrl;
 837         }
 838
 839         /* populate wide_bus_en to differernt layers */
 840         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 841         dp->catalog->wide_bus_en = dp->wide_bus_en;
 842
 843         return rc;
 844
 845 error_ctrl:
 846         dp_panel_put(dp->panel);
 847 error_link:
 848         dp_aux_put(dp->aux);
 849 error:
 850         return rc;
 851 }
 852
 853 static int dp_display_set_mode(struct msm_dp *dp_display,
 854                                struct dp_display_mode *mode)
 855 {
 856         struct dp_display_private *dp;
 857
 858         dp = container_of(dp_display, struct dp_display_private, dp_display);
 859
 860         dp->panel->dp_mode.drm_mode = mode->drm_mode;
 861         dp->panel->dp_mode.bpp = mode->bpp;
 862         dp->panel->dp_mode.capabilities = mode->capabilities;
 863         dp_panel_init_panel_info(dp->panel);
 864         return 0;
 865 }
 866
 867 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
 868 {
 869         int rc = 0;
 870         struct msm_dp *dp_display = &dp->dp_display;
 871
 872         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 873         if (dp_display->power_on) {
 874                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 875                 return 0;
 876         }
 877
 878         rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
 879         if (!rc)
 880                 dp_display->power_on = true;
 881
 882         return rc;
 883 }
 884
 885 static int dp_display_post_enable(struct msm_dp *dp_display)
 886 {
 887         struct dp_display_private *dp;
 888         u32 rate;
 889
 890         dp = container_of(dp_display, struct dp_display_private, dp_display);
 891
 892         rate = dp->link->link_params.rate;
 893
 894         if (dp->audio_supported) {
 895                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 896                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 897         }
 898
 899         /* signal the connect event late to synchronize video and display */
 900         dp_display_handle_plugged_change(dp_display, true);
 901         return 0;
 902 }
 903
 904 static int dp_display_disable(struct dp_display_private *dp)
 905 {
 906         struct msm_dp *dp_display = &dp->dp_display;
 907
 908         if (!dp_display->power_on)
 909                 return 0;
 910
 911         /* wait only if audio was enabled */
 912         if (dp_display->audio_enabled) {
 913                 /* signal the disconnect event */
 914                 dp_display_handle_plugged_change(dp_display, false);
 915                 if (!wait_for_completion_timeout(&dp->audio_comp,
 916                                 HZ * 5))
 917                         DRM_ERROR("audio comp timeout\n");
 918         }
 919
 920         dp_display->audio_enabled = false;
 921
 922         if (dp->link->sink_count == 0) {
 923                 /*
 924                  * irq_hpd with sink_count = 0
 925                  * hdmi unplugged out of dongle
 926                  */
 927                 dp_ctrl_off_link_stream(dp->ctrl);
 928         } else {
 929                 /*
 930                  * unplugged interrupt
 931                  * dongle unplugged out of DUT
 932                  */
 933                 dp_ctrl_off(dp->ctrl);
 934                 dp_display_host_phy_exit(dp);
 935         }
 936
 937         dp_display->power_on = false;
 938
 939         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 940         return 0;
 941 }
 942
 943 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 944                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 945 {
 946         bool plugged;
 947
 948         dp_display->plugged_cb = fn;
 949         dp_display->codec_dev = codec_dev;
 950         plugged = dp_display->is_connected;
 951         dp_display_handle_plugged_change(dp_display, plugged);
 952
 953         return 0;
 954 }
 955
 956 /**
 957  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 958  * @bridge: Pointer to drm bridge structure
 959  * @info: display info
 960  * @mode: Pointer to drm mode structure
 961  * Returns: Validity status for specified mode
 962  */
 963 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 964                                           const struct drm_display_info *info,
 965                                           const struct drm_display_mode *mode)
 966 {
 967         const u32 num_components = 3, default_bpp = 24;
 968         struct dp_display_private *dp_display;
 969         struct dp_link_info *link_info;
 970         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 971         struct msm_dp *dp;
 972         int mode_pclk_khz = mode->clock;
 973
 974         dp = to_dp_bridge(bridge)->dp_display;
 975
 976         if (!dp || !mode_pclk_khz || !dp->connector) {
 977                 DRM_ERROR("invalid params\n");
 978                 return -EINVAL;
 979         }
 980
 981         /*
 982          * The eDP controller currently does not have a reliable way of
 983          * enabling panel power to read sink capabilities. So, we rely
 984          * on the panel driver to populate only supported modes for now.
 985          */
 986         if (dp->is_edp)
 987                 return MODE_OK;
 988
 989         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 990                 return MODE_CLOCK_HIGH;
 991
 992         dp_display = container_of(dp, struct dp_display_private, dp_display);
 993         link_info = &dp_display->panel->link_info;
 994
 995         mode_bpp = dp->connector->display_info.bpc * num_components;
 996         if (!mode_bpp)
 997                 mode_bpp = default_bpp;
 998
 999         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
1000                         mode_bpp, mode_pclk_khz);
1001
1002         mode_rate_khz = mode_pclk_khz * mode_bpp;
1003         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
1004
1005         if (mode_rate_khz > supported_rate_khz)
1006                 return MODE_BAD;
1007
1008         return MODE_OK;
1009 }
1010
1011 int dp_display_get_modes(struct msm_dp *dp)
1012 {
1013         struct dp_display_private *dp_display;
1014
1015         if (!dp) {
1016                 DRM_ERROR("invalid params\n");
1017                 return 0;
1018         }
1019
1020         dp_display = container_of(dp, struct dp_display_private, dp_display);
1021
1022         return dp_panel_get_modes(dp_display->panel,
1023                 dp->connector);
1024 }
1025
1026 bool dp_display_check_video_test(struct msm_dp *dp)
1027 {
1028         struct dp_display_private *dp_display;
1029
1030         dp_display = container_of(dp, struct dp_display_private, dp_display);
1031
1032         return dp_display->panel->video_test;
1033 }
1034
1035 int dp_display_get_test_bpp(struct msm_dp *dp)
1036 {
1037         struct dp_display_private *dp_display;
1038
1039         if (!dp) {
1040                 DRM_ERROR("invalid params\n");
1041                 return 0;
1042         }
1043
1044         dp_display = container_of(dp, struct dp_display_private, dp_display);
1045
1046         return dp_link_bit_depth_to_bpp(
1047                 dp_display->link->test_video.test_bit_depth);
1048 }
1049
1050 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1051 {
1052         struct dp_display_private *dp_display;
1053
1054         dp_display = container_of(dp, struct dp_display_private, dp_display);
1055
1056         /*
1057          * if we are reading registers we need the link clocks to be on
1058          * however till DP cable is connected this will not happen as we
1059          * do not know the resolution to power up with. Hence check the
1060          * power_on status before dumping DP registers to avoid crash due
1061          * to unclocked access
1062          */
1063         mutex_lock(&dp_display->event_mutex);
1064
1065         if (!dp->power_on) {
1066                 mutex_unlock(&dp_display->event_mutex);
1067                 return;
1068         }
1069
1070         dp_catalog_snapshot(dp_display->catalog, disp_state);
1071
1072         mutex_unlock(&dp_display->event_mutex);
1073 }
1074
1075 static void dp_display_config_hpd(struct dp_display_private *dp)
1076 {
1077
1078         dp_display_host_init(dp);
1079         dp_catalog_ctrl_hpd_config(dp->catalog);
1080
1081         /* Enable plug and unplug interrupts only for external DisplayPort */
1082         if (!dp->dp_display.is_edp)
1083                 dp_catalog_hpd_config_intr(dp->catalog,
1084                                 DP_DP_HPD_PLUG_INT_MASK |
1085                                 DP_DP_HPD_UNPLUG_INT_MASK,
1086                                 true);
1087
1088         /* Enable interrupt first time
1089          * we are leaving dp clocks on during disconnect
1090          * and never disable interrupt
1091          */
1092         enable_irq(dp->irq);
1093 }
1094
1095 static int hpd_event_thread(void *data)
1096 {
1097         struct dp_display_private *dp_priv;
1098         unsigned long flag;
1099         struct dp_event *todo;
1100         int timeout_mode = 0;
1101
1102         dp_priv = (struct dp_display_private *)data;
1103
1104         while (1) {
1105                 if (timeout_mode) {
1106                         wait_event_timeout(dp_priv->event_q,
1107                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1108                                         kthread_should_stop(), EVENT_TIMEOUT);
1109                 } else {
1110                         wait_event_interruptible(dp_priv->event_q,
1111                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1112                                         kthread_should_stop());
1113                 }
1114
1115                 if (kthread_should_stop())
1116                         break;
1117
1118                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1119                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1120                 if (todo->delay) {
1121                         struct dp_event *todo_next;
1122
1123                         dp_priv->event_gndx++;
1124                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1125
1126                         /* re enter delay event into q */
1127                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1128                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1129                         todo_next->event_id = todo->event_id;
1130                         todo_next->data = todo->data;
1131                         todo_next->delay = todo->delay - 1;
1132
1133                         /* clean up older event */
1134                         todo->event_id = EV_NO_EVENT;
1135                         todo->delay = 0;
1136
1137                         /* switch to timeout mode */
1138                         timeout_mode = 1;
1139                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1140                         continue;
1141                 }
1142
1143                 /* timeout with no events in q */
1144                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1145                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1146                         continue;
1147                 }
1148
1149                 dp_priv->event_gndx++;
1150                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1151                 timeout_mode = 0;
1152                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1153
1154                 switch (todo->event_id) {
1155                 case EV_HPD_INIT_SETUP:
1156                         dp_display_config_hpd(dp_priv);
1157                         break;
1158                 case EV_HPD_PLUG_INT:
1159                         dp_hpd_plug_handle(dp_priv, todo->data);
1160                         break;
1161                 case EV_HPD_UNPLUG_INT:
1162                         dp_hpd_unplug_handle(dp_priv, todo->data);
1163                         break;
1164                 case EV_IRQ_HPD_INT:
1165                         dp_irq_hpd_handle(dp_priv, todo->data);
1166                         break;
1167                 case EV_USER_NOTIFICATION:
1168                         dp_display_send_hpd_notification(dp_priv,
1169                                                 todo->data);
1170                         break;
1171                 default:
1172                         break;
1173                 }
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1180 {
1181         /* set event q to empty */
1182         dp_priv->event_gndx = 0;
1183         dp_priv->event_pndx = 0;
1184
1185         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1186         if (IS_ERR(dp_priv->ev_tsk))
1187                 return PTR_ERR(dp_priv->ev_tsk);
1188
1189         return 0;
1190 }
1191
1192 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1193 {
1194         struct dp_display_private *dp = dev_id;
1195         irqreturn_t ret = IRQ_HANDLED;
1196         u32 hpd_isr_status;
1197
1198         if (!dp) {
1199                 DRM_ERROR("invalid data\n");
1200                 return IRQ_NONE;
1201         }
1202
1203         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1204
1205         if (hpd_isr_status & 0x0F) {
1206                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1207                         dp->dp_display.connector_type, hpd_isr_status);
1208                 /* hpd related interrupts */
1209                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1210                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1211
1212                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1213                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1214                 }
1215
1216                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1217                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1218                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1219                 }
1220
1221                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1222                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1223         }
1224
1225         /* DP controller isr */
1226         dp_ctrl_isr(dp->ctrl);
1227
1228         /* DP aux isr */
1229         dp_aux_isr(dp->aux);
1230
1231         return ret;
1232 }
1233
1234 int dp_display_request_irq(struct msm_dp *dp_display)
1235 {
1236         int rc = 0;
1237         struct dp_display_private *dp;
1238
1239         if (!dp_display) {
1240                 DRM_ERROR("invalid input\n");
1241                 return -EINVAL;
1242         }
1243
1244         dp = container_of(dp_display, struct dp_display_private, dp_display);
1245
1246         dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1247         if (!dp->irq) {
1248                 DRM_ERROR("failed to get irq\n");
1249                 return -EINVAL;
1250         }
1251
1252         rc = devm_request_irq(&dp->pdev->dev, dp->irq,
1253                         dp_display_irq_handler,
1254                         IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1255         if (rc < 0) {
1256                 DRM_ERROR("failed to request IRQ%u: %d\n",
1257                                 dp->irq, rc);
1258                 return rc;
1259         }
1260         disable_irq(dp->irq);
1261
1262         return 0;
1263 }
1264
1265 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev,
1266                                                      unsigned int *id)
1267 {
1268         const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
1269         struct resource *res;
1270         int i;
1271
1272         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1273         if (!res)
1274                 return NULL;
1275
1276         for (i = 0; i < cfg->num_descs; i++) {
1277                 if (cfg->descs[i].io_start == res->start) {
1278                         *id = i;
1279                         return &cfg->descs[i];
1280                 }
1281         }
1282
1283         dev_err(&pdev->dev, "unknown displayport instance\n");
1284         return NULL;
1285 }
1286
1287 static int dp_display_probe(struct platform_device *pdev)
1288 {
1289         int rc = 0;
1290         struct dp_display_private *dp;
1291         const struct msm_dp_desc *desc;
1292
1293         if (!pdev || !pdev->dev.of_node) {
1294                 DRM_ERROR("pdev not found\n");
1295                 return -ENODEV;
1296         }
1297
1298         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1299         if (!dp)
1300                 return -ENOMEM;
1301
1302         desc = dp_display_get_desc(pdev, &dp->id);
1303         if (!desc)
1304                 return -EINVAL;
1305
1306         dp->pdev = pdev;
1307         dp->name = "drm_dp";
1308         dp->dp_display.connector_type = desc->connector_type;
1309         dp->wide_bus_en = desc->wide_bus_en;
1310         dp->dp_display.is_edp =
1311                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1312
1313         rc = dp_init_sub_modules(dp);
1314         if (rc) {
1315                 DRM_ERROR("init sub module failed\n");
1316                 return -EPROBE_DEFER;
1317         }
1318
1319         /* setup event q */
1320         mutex_init(&dp->event_mutex);
1321         init_waitqueue_head(&dp->event_q);
1322         spin_lock_init(&dp->event_lock);
1323
1324         /* Store DP audio handle inside DP display */
1325         dp->dp_display.dp_audio = dp->audio;
1326
1327         init_completion(&dp->audio_comp);
1328
1329         platform_set_drvdata(pdev, &dp->dp_display);
1330
1331         rc = component_add(&pdev->dev, &dp_display_comp_ops);
1332         if (rc) {
1333                 DRM_ERROR("component add failed, rc=%d\n", rc);
1334                 dp_display_deinit_sub_modules(dp);
1335         }
1336
1337         return rc;
1338 }
1339
1340 static int dp_display_remove(struct platform_device *pdev)
1341 {
1342         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1343
1344         dp_display_deinit_sub_modules(dp);
1345
1346         component_del(&pdev->dev, &dp_display_comp_ops);
1347         platform_set_drvdata(pdev, NULL);
1348
1349         return 0;
1350 }
1351
1352 static int dp_pm_resume(struct device *dev)
1353 {
1354         struct platform_device *pdev = to_platform_device(dev);
1355         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1356         struct dp_display_private *dp;
1357         int sink_count = 0;
1358
1359         dp = container_of(dp_display, struct dp_display_private, dp_display);
1360
1361         mutex_lock(&dp->event_mutex);
1362
1363         drm_dbg_dp(dp->drm_dev,
1364                 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1365                 dp->dp_display.connector_type, dp->core_initialized,
1366                 dp->phy_initialized, dp_display->power_on);
1367
1368         /* start from disconnected state */
1369         dp->hpd_state = ST_DISCONNECTED;
1370
1371         /* turn on dp ctrl/phy */
1372         dp_display_host_init(dp);
1373
1374         dp_catalog_ctrl_hpd_config(dp->catalog);
1375
1376
1377         if (!dp->dp_display.is_edp)
1378                 dp_catalog_hpd_config_intr(dp->catalog,
1379                                 DP_DP_HPD_PLUG_INT_MASK |
1380                                 DP_DP_HPD_UNPLUG_INT_MASK,
1381                                 true);
1382
1383         if (dp_catalog_link_is_connected(dp->catalog)) {
1384                 /*
1385                  * set sink to normal operation mode -- D0
1386                  * before dpcd read
1387                  */
1388                 dp_display_host_phy_init(dp);
1389                 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1390                 sink_count = drm_dp_read_sink_count(dp->aux);
1391                 if (sink_count < 0)
1392                         sink_count = 0;
1393
1394                 dp_display_host_phy_exit(dp);
1395         }
1396
1397         dp->link->sink_count = sink_count;
1398         /*
1399          * can not declared display is connected unless
1400          * HDMI cable is plugged in and sink_count of
1401          * dongle become 1
1402          * also only signal audio when disconnected
1403          */
1404         if (dp->link->sink_count) {
1405                 dp->dp_display.is_connected = true;
1406         } else {
1407                 dp->dp_display.is_connected = false;
1408                 dp_display_handle_plugged_change(dp_display, false);
1409         }
1410
1411         drm_dbg_dp(dp->drm_dev,
1412                 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1413                 dp->dp_display.connector_type, dp->link->sink_count,
1414                 dp->dp_display.is_connected, dp->core_initialized,
1415                 dp->phy_initialized, dp_display->power_on);
1416
1417         mutex_unlock(&dp->event_mutex);
1418
1419         return 0;
1420 }
1421
1422 static int dp_pm_suspend(struct device *dev)
1423 {
1424         struct platform_device *pdev = to_platform_device(dev);
1425         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1426         struct dp_display_private *dp;
1427
1428         dp = container_of(dp_display, struct dp_display_private, dp_display);
1429
1430         mutex_lock(&dp->event_mutex);
1431
1432         drm_dbg_dp(dp->drm_dev,
1433                 "Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
1434                 dp->dp_display.connector_type, dp->core_initialized,
1435                 dp->phy_initialized, dp_display->power_on);
1436
1437         /* mainlink enabled */
1438         if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1439                 dp_ctrl_off_link_stream(dp->ctrl);
1440
1441         dp_display_host_phy_exit(dp);
1442
1443         /* host_init will be called at pm_resume */
1444         dp_display_host_deinit(dp);
1445
1446         dp->hpd_state = ST_SUSPENDED;
1447
1448         drm_dbg_dp(dp->drm_dev,
1449                 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1450                 dp->dp_display.connector_type, dp->core_initialized,
1451                 dp->phy_initialized, dp_display->power_on);
1452
1453         mutex_unlock(&dp->event_mutex);
1454
1455         return 0;
1456 }
1457
1458 static const struct dev_pm_ops dp_pm_ops = {
1459         .suspend = dp_pm_suspend,
1460         .resume =  dp_pm_resume,
1461 };
1462
1463 static struct platform_driver dp_display_driver = {
1464         .probe  = dp_display_probe,
1465         .remove = dp_display_remove,
1466         .driver = {
1467                 .name = "msm-dp-display",
1468                 .of_match_table = dp_dt_match,
1469                 .suppress_bind_attrs = true,
1470                 .pm = &dp_pm_ops,
1471         },
1472 };
1473
1474 int __init msm_dp_register(void)
1475 {
1476         int ret;
1477
1478         ret = platform_driver_register(&dp_display_driver);
1479         if (ret)
1480                 DRM_ERROR("Dp display driver register failed");
1481
1482         return ret;
1483 }
1484
1485 void __exit msm_dp_unregister(void)
1486 {
1487         platform_driver_unregister(&dp_display_driver);
1488 }
1489
1490 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1491 {
1492         struct dp_display_private *dp;
1493
1494         if (!dp_display)
1495                 return;
1496
1497         dp = container_of(dp_display, struct dp_display_private, dp_display);
1498
1499         if (!dp_display->is_edp)
1500                 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
1501 }
1502
1503 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1504 {
1505         struct dp_display_private *dp;
1506
1507         dp = container_of(dp_display, struct dp_display_private, dp_display);
1508
1509         return dp->wide_bus_en;
1510 }
1511
1512 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1513 {
1514         struct dp_display_private *dp;
1515         struct device *dev;
1516         int rc;
1517
1518         dp = container_of(dp_display, struct dp_display_private, dp_display);
1519         dev = &dp->pdev->dev;
1520
1521         dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
1522                                         dp->link, dp->dp_display.connector,
1523                                         minor);
1524         if (IS_ERR(dp->debug)) {
1525                 rc = PTR_ERR(dp->debug);
1526                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1527                 dp->debug = NULL;
1528         }
1529 }
1530
1531 static int dp_display_get_next_bridge(struct msm_dp *dp)
1532 {
1533         int rc;
1534         struct dp_display_private *dp_priv;
1535         struct device_node *aux_bus;
1536         struct device *dev;
1537
1538         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1539         dev = &dp_priv->pdev->dev;
1540         aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1541
1542         if (aux_bus && dp->is_edp) {
1543                 dp_display_host_init(dp_priv);
1544                 dp_catalog_ctrl_hpd_config(dp_priv->catalog);
1545                 dp_display_host_phy_init(dp_priv);
1546                 enable_irq(dp_priv->irq);
1547
1548                 /*
1549                  * The code below assumes that the panel will finish probing
1550                  * by the time devm_of_dp_aux_populate_ep_devices() returns.
1551                  * This isn't a great assumption since it will fail if the
1552                  * panel driver is probed asynchronously but is the best we
1553                  * can do without a bigger driver reorganization.
1554                  */
1555                 rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux);
1556                 of_node_put(aux_bus);
1557                 if (rc)
1558                         goto error;
1559         } else if (dp->is_edp) {
1560                 DRM_ERROR("eDP aux_bus not found\n");
1561                 return -ENODEV;
1562         }
1563
1564         /*
1565          * External bridges are mandatory for eDP interfaces: one has to
1566          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1567          *
1568          * For DisplayPort interfaces external bridges are optional, so
1569          * silently ignore an error if one is not present (-ENODEV).
1570          */
1571         rc = dp_parser_find_next_bridge(dp_priv->parser);
1572         if (!dp->is_edp && rc == -ENODEV)
1573                 return 0;
1574
1575         if (!rc) {
1576                 dp->next_bridge = dp_priv->parser->next_bridge;
1577                 return 0;
1578         }
1579
1580 error:
1581         if (dp->is_edp) {
1582                 disable_irq(dp_priv->irq);
1583                 dp_display_host_phy_exit(dp_priv);
1584                 dp_display_host_deinit(dp_priv);
1585         }
1586         return rc;
1587 }
1588
1589 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1590                         struct drm_encoder *encoder)
1591 {
1592         struct msm_drm_private *priv;
1593         struct dp_display_private *dp_priv;
1594         int ret;
1595
1596         if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
1597                 return -EINVAL;
1598
1599         priv = dev->dev_private;
1600         dp_display->drm_dev = dev;
1601
1602         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1603
1604         ret = dp_display_request_irq(dp_display);
1605         if (ret) {
1606                 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1607                 return ret;
1608         }
1609
1610         ret = dp_display_get_next_bridge(dp_display);
1611         if (ret)
1612                 return ret;
1613
1614         dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1615         if (IS_ERR(dp_display->bridge)) {
1616                 ret = PTR_ERR(dp_display->bridge);
1617                 DRM_DEV_ERROR(dev->dev,
1618                         "failed to create dp bridge: %d\n", ret);
1619                 dp_display->bridge = NULL;
1620                 return ret;
1621         }
1622
1623         priv->bridges[priv->num_bridges++] = dp_display->bridge;
1624
1625         dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1626         if (IS_ERR(dp_display->connector)) {
1627                 ret = PTR_ERR(dp_display->connector);
1628                 DRM_DEV_ERROR(dev->dev,
1629                         "failed to create dp connector: %d\n", ret);
1630                 dp_display->connector = NULL;
1631                 return ret;
1632         }
1633
1634         dp_priv->panel->connector = dp_display->connector;
1635
1636         return 0;
1637 }
1638
1639 void dp_bridge_enable(struct drm_bridge *drm_bridge)
1640 {
1641         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1642         struct msm_dp *dp = dp_bridge->dp_display;
1643         int rc = 0;
1644         struct dp_display_private *dp_display;
1645         u32 state;
1646         bool force_link_train = false;
1647
1648         dp_display = container_of(dp, struct dp_display_private, dp_display);
1649         if (!dp_display->dp_mode.drm_mode.clock) {
1650                 DRM_ERROR("invalid params\n");
1651                 return;
1652         }
1653
1654         if (dp->is_edp)
1655                 dp_hpd_plug_handle(dp_display, 0);
1656
1657         mutex_lock(&dp_display->event_mutex);
1658
1659         state = dp_display->hpd_state;
1660         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1661                 mutex_unlock(&dp_display->event_mutex);
1662                 return;
1663         }
1664
1665         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1666         if (rc) {
1667                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1668                 mutex_unlock(&dp_display->event_mutex);
1669                 return;
1670         }
1671
1672         state =  dp_display->hpd_state;
1673
1674         if (state == ST_DISPLAY_OFF) {
1675                 dp_display_host_phy_init(dp_display);
1676                 force_link_train = true;
1677         }
1678
1679         dp_display_enable(dp_display, force_link_train);
1680
1681         rc = dp_display_post_enable(dp);
1682         if (rc) {
1683                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1684                 dp_display_disable(dp_display);
1685         }
1686
1687         /* completed connection */
1688         dp_display->hpd_state = ST_CONNECTED;
1689
1690         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1691         mutex_unlock(&dp_display->event_mutex);
1692 }
1693
1694 void dp_bridge_disable(struct drm_bridge *drm_bridge)
1695 {
1696         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1697         struct msm_dp *dp = dp_bridge->dp_display;
1698         struct dp_display_private *dp_display;
1699
1700         dp_display = container_of(dp, struct dp_display_private, dp_display);
1701
1702         dp_ctrl_push_idle(dp_display->ctrl);
1703 }
1704
1705 void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
1706 {
1707         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1708         struct msm_dp *dp = dp_bridge->dp_display;
1709         u32 state;
1710         struct dp_display_private *dp_display;
1711
1712         dp_display = container_of(dp, struct dp_display_private, dp_display);
1713
1714         if (dp->is_edp)
1715                 dp_hpd_unplug_handle(dp_display, 0);
1716
1717         mutex_lock(&dp_display->event_mutex);
1718
1719         state = dp_display->hpd_state;
1720         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1721                 mutex_unlock(&dp_display->event_mutex);
1722                 return;
1723         }
1724
1725         dp_display_disable(dp_display);
1726
1727         state =  dp_display->hpd_state;
1728         if (state == ST_DISCONNECT_PENDING) {
1729                 /* completed disconnection */
1730                 dp_display->hpd_state = ST_DISCONNECTED;
1731         } else {
1732                 dp_display->hpd_state = ST_DISPLAY_OFF;
1733         }
1734
1735         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1736         mutex_unlock(&dp_display->event_mutex);
1737 }
1738
1739 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1740                         const struct drm_display_mode *mode,
1741                         const struct drm_display_mode *adjusted_mode)
1742 {
1743         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1744         struct msm_dp *dp = dp_bridge->dp_display;
1745         struct dp_display_private *dp_display;
1746
1747         dp_display = container_of(dp, struct dp_display_private, dp_display);
1748
1749         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1750
1751         if (dp_display_check_video_test(dp))
1752                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1753         else /* Default num_components per pixel = 3 */
1754                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1755
1756         if (!dp_display->dp_mode.bpp)
1757                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1758
1759         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1760
1761         dp_display->dp_mode.v_active_low =
1762                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1763
1764         dp_display->dp_mode.h_active_low =
1765                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1766 }