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_parser.h"
  18 #include "dp_power.h"
  19 #include "dp_catalog.h"
  20 #include "dp_aux.h"
  21 #include "dp_reg.h"
  22 #include "dp_link.h"
  23 #include "dp_panel.h"
  24 #include "dp_ctrl.h"
  25 #include "dp_display.h"
  26 #include "dp_drm.h"
  27 #include "dp_audio.h"
  28 #include "dp_debug.h"
  29
  30 static bool psr_enabled = false;
  31 module_param(psr_enabled, bool, 0);
  32 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
  33
  34 #define HPD_STRING_SIZE 30
  35
  36 enum {
  37         ISR_DISCONNECTED,
  38         ISR_CONNECT_PENDING,
  39         ISR_CONNECTED,
  40         ISR_HPD_REPLUG_COUNT,
  41         ISR_IRQ_HPD_PULSE_COUNT,
  42         ISR_HPD_LO_GLITH_COUNT,
  43 };
  44
  45 /* event thread connection state */
  46 enum {
  47         ST_DISCONNECTED,
  48         ST_MAINLINK_READY,
  49         ST_CONNECTED,
  50         ST_DISCONNECT_PENDING,
  51         ST_DISPLAY_OFF,
  52         ST_SUSPENDED,
  53 };
  54
  55 enum {
  56         EV_NO_EVENT,
  57         /* hpd events */
  58         EV_HPD_INIT_SETUP,
  59         EV_HPD_PLUG_INT,
  60         EV_IRQ_HPD_INT,
  61         EV_HPD_UNPLUG_INT,
  62         EV_USER_NOTIFICATION,
  63 };
  64
  65 #define EVENT_TIMEOUT   (HZ/10) /* 100ms */
  66 #define DP_EVENT_Q_MAX  8
  67
  68 #define DP_TIMEOUT_NONE         0
  69
  70 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  71
  72 struct dp_event {
  73         u32 event_id;
  74         u32 data;
  75         u32 delay;
  76 };
  77
  78 struct dp_display_private {
  79         char *name;
  80         int irq;
  81
  82         unsigned int id;
  83
  84         /* state variables */
  85         bool core_initialized;
  86         bool phy_initialized;
  87         bool hpd_irq_on;
  88         bool audio_supported;
  89
  90         struct drm_device *drm_dev;
  91         struct dentry *root;
  92
  93         struct dp_parser  *parser;
  94         struct dp_power   *power;
  95         struct dp_catalog *catalog;
  96         struct drm_dp_aux *aux;
  97         struct dp_link    *link;
  98         struct dp_panel   *panel;
  99         struct dp_ctrl    *ctrl;
 100         struct dp_debug   *debug;
 101
 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 id;
 126         unsigned int connector_type;
 127         bool wide_bus_en;
 128 };
 129
 130 static const struct msm_dp_desc sc7180_dp_descs[] = {
 131         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 132         {}
 133 };
 134
 135 static const struct msm_dp_desc sc7280_dp_descs[] = {
 136         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 137         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 138         {}
 139 };
 140
 141 static const struct msm_dp_desc sc8180x_dp_descs[] = {
 142         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 143         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 144         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
 145         {}
 146 };
 147
 148 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
 149         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 150         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 151         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 152         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 153         { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 154         { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 155         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 156         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 157         {}
 158 };
 159
 160 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
 161         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 162         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 163         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 164         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 165         {}
 166 };
 167
 168 static const struct msm_dp_desc sm8350_dp_descs[] = {
 169         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 170         {}
 171 };
 172
 173 static const struct of_device_id dp_dt_match[] = {
 174         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
 175         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
 176         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
 177         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
 178         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
 179         { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
 180         { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
 181         { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
 182         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
 183         {}
 184 };
 185
 186 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 187 {
 188         struct msm_dp *dp = dev_get_drvdata(dev);
 189
 190         return container_of(dp, struct dp_display_private, dp_display);
 191 }
 192
 193 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 194                                                 u32 data, u32 delay)
 195 {
 196         unsigned long flag;
 197         struct dp_event *todo;
 198         int pndx;
 199
 200         spin_lock_irqsave(&dp_priv->event_lock, flag);
 201         pndx = dp_priv->event_pndx + 1;
 202         pndx %= DP_EVENT_Q_MAX;
 203         if (pndx == dp_priv->event_gndx) {
 204                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 205                         dp_priv->event_pndx, dp_priv->event_gndx);
 206                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 207                 return -EPERM;
 208         }
 209         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 210         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 211         todo->event_id = event;
 212         todo->data = data;
 213         todo->delay = delay;
 214         wake_up(&dp_priv->event_q);
 215         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 216
 217         return 0;
 218 }
 219
 220 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 221 {
 222         unsigned long flag;
 223         struct dp_event *todo;
 224         u32     gndx;
 225
 226         spin_lock_irqsave(&dp_priv->event_lock, flag);
 227         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 228                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 229                 return -ENOENT;
 230         }
 231
 232         gndx = dp_priv->event_gndx;
 233         while (dp_priv->event_pndx != gndx) {
 234                 todo = &dp_priv->event_list[gndx];
 235                 if (todo->event_id == event) {
 236                         todo->event_id = EV_NO_EVENT;   /* deleted */
 237                         todo->delay = 0;
 238                 }
 239                 gndx++;
 240                 gndx %= DP_EVENT_Q_MAX;
 241         }
 242         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 243
 244         return 0;
 245 }
 246
 247 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 248 {
 249         struct dp_display_private *dp;
 250
 251         dp = container_of(dp_display, struct dp_display_private, dp_display);
 252
 253         reinit_completion(&dp->audio_comp);
 254 }
 255
 256 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 257 {
 258         struct dp_display_private *dp;
 259
 260         dp = container_of(dp_display, struct dp_display_private, dp_display);
 261
 262         complete_all(&dp->audio_comp);
 263 }
 264
 265 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 266
 267 static int dp_display_bind(struct device *dev, struct device *master,
 268                            void *data)
 269 {
 270         int rc = 0;
 271         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 272         struct msm_drm_private *priv = dev_get_drvdata(master);
 273         struct drm_device *drm = priv->dev;
 274
 275         dp->dp_display.drm_dev = drm;
 276         priv->dp[dp->id] = &dp->dp_display;
 277
 278         rc = dp->parser->parse(dp->parser);
 279         if (rc) {
 280                 DRM_ERROR("device tree parsing failed\n");
 281                 goto end;
 282         }
 283
 284
 285         dp->drm_dev = drm;
 286         dp->aux->drm_dev = drm;
 287         rc = dp_aux_register(dp->aux);
 288         if (rc) {
 289                 DRM_ERROR("DRM DP AUX register failed\n");
 290                 goto end;
 291         }
 292
 293         rc = dp_power_client_init(dp->power);
 294         if (rc) {
 295                 DRM_ERROR("Power client create failed\n");
 296                 goto end;
 297         }
 298
 299         rc = dp_register_audio_driver(dev, dp->audio);
 300         if (rc) {
 301                 DRM_ERROR("Audio registration Dp failed\n");
 302                 goto end;
 303         }
 304
 305         rc = dp_hpd_event_thread_start(dp);
 306         if (rc) {
 307                 DRM_ERROR("Event thread create failed\n");
 308                 goto end;
 309         }
 310
 311         return 0;
 312 end:
 313         return rc;
 314 }
 315
 316 static void dp_display_unbind(struct device *dev, struct device *master,
 317                               void *data)
 318 {
 319         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 320         struct msm_drm_private *priv = dev_get_drvdata(master);
 321
 322         /* disable all HPD interrupts */
 323         if (dp->core_initialized)
 324                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
 325
 326         kthread_stop(dp->ev_tsk);
 327
 328         of_dp_aux_depopulate_bus(dp->aux);
 329
 330         dp_power_client_deinit(dp->power);
 331         dp_unregister_audio_driver(dev, dp->audio);
 332         dp_aux_unregister(dp->aux);
 333         dp->drm_dev = NULL;
 334         dp->aux->drm_dev = NULL;
 335         priv->dp[dp->id] = NULL;
 336 }
 337
 338 static const struct component_ops dp_display_comp_ops = {
 339         .bind = dp_display_bind,
 340         .unbind = dp_display_unbind,
 341 };
 342
 343 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 344 {
 345         struct dp_display_private *dp;
 346         struct drm_connector *connector;
 347
 348         dp = container_of(dp_display, struct dp_display_private, dp_display);
 349
 350         connector = dp->dp_display.connector;
 351         drm_helper_hpd_irq_event(connector->dev);
 352 }
 353
 354
 355 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 356                                             bool hpd)
 357 {
 358         if ((hpd && dp->dp_display.is_connected) ||
 359                         (!hpd && !dp->dp_display.is_connected)) {
 360                 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 361                                 (hpd ? "on" : "off"));
 362                 return 0;
 363         }
 364
 365         /* reset video pattern flag on disconnect */
 366         if (!hpd) {
 367                 dp->panel->video_test = false;
 368                 if (!dp->dp_display.is_edp)
 369                         drm_dp_set_subconnector_property(dp->dp_display.connector,
 370                                                          connector_status_disconnected,
 371                                                          dp->panel->dpcd,
 372                                                          dp->panel->downstream_ports);
 373         }
 374
 375         dp->dp_display.is_connected = hpd;
 376
 377         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 378                         dp->dp_display.connector_type, hpd);
 379         dp_display_send_hpd_event(&dp->dp_display);
 380
 381         return 0;
 382 }
 383
 384 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 385 {
 386         int rc = 0;
 387         struct edid *edid;
 388
 389         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 390         dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
 391
 392         drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
 393                 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
 394
 395         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 396         if (rc)
 397                 goto end;
 398
 399         dp_link_process_request(dp->link);
 400
 401         if (!dp->dp_display.is_edp)
 402                 drm_dp_set_subconnector_property(dp->dp_display.connector,
 403                                                  connector_status_connected,
 404                                                  dp->panel->dpcd,
 405                                                  dp->panel->downstream_ports);
 406
 407         edid = dp->panel->edid;
 408
 409         dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
 410
 411         dp->audio_supported = drm_detect_monitor_audio(edid);
 412         dp_panel_handle_sink_request(dp->panel);
 413
 414         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 415
 416         /*
 417          * set sink to normal operation mode -- D0
 418          * before dpcd read
 419          */
 420         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 421
 422         dp_link_reset_phy_params_vx_px(dp->link);
 423         rc = dp_ctrl_on_link(dp->ctrl);
 424         if (rc) {
 425                 DRM_ERROR("failed to complete DP link training\n");
 426                 goto end;
 427         }
 428
 429         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 430
 431 end:
 432         return rc;
 433 }
 434
 435 static void dp_display_host_phy_init(struct dp_display_private *dp)
 436 {
 437         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 438                 dp->dp_display.connector_type, dp->core_initialized,
 439                 dp->phy_initialized);
 440
 441         if (!dp->phy_initialized) {
 442                 dp_ctrl_phy_init(dp->ctrl);
 443                 dp->phy_initialized = true;
 444         }
 445 }
 446
 447 static void dp_display_host_phy_exit(struct dp_display_private *dp)
 448 {
 449         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 450                 dp->dp_display.connector_type, dp->core_initialized,
 451                 dp->phy_initialized);
 452
 453         if (dp->phy_initialized) {
 454                 dp_ctrl_phy_exit(dp->ctrl);
 455                 dp->phy_initialized = false;
 456         }
 457 }
 458
 459 static void dp_display_host_init(struct dp_display_private *dp)
 460 {
 461         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 462                 dp->dp_display.connector_type, dp->core_initialized,
 463                 dp->phy_initialized);
 464
 465         dp_power_init(dp->power);
 466         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 467         dp_aux_init(dp->aux);
 468         dp->core_initialized = true;
 469 }
 470
 471 static void dp_display_host_deinit(struct dp_display_private *dp)
 472 {
 473         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 474                 dp->dp_display.connector_type, dp->core_initialized,
 475                 dp->phy_initialized);
 476
 477         dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
 478         dp_aux_deinit(dp->aux);
 479         dp_power_deinit(dp->power);
 480         dp->core_initialized = false;
 481 }
 482
 483 static int dp_display_usbpd_configure_cb(struct device *dev)
 484 {
 485         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 486
 487         dp_display_host_phy_init(dp);
 488
 489         return dp_display_process_hpd_high(dp);
 490 }
 491
 492 static int dp_display_notify_disconnect(struct device *dev)
 493 {
 494         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 495
 496         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 497
 498         return 0;
 499 }
 500
 501 static void dp_display_handle_video_request(struct dp_display_private *dp)
 502 {
 503         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 504                 dp->panel->video_test = true;
 505                 dp_link_send_test_response(dp->link);
 506         }
 507 }
 508
 509 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 510 {
 511         int rc = 0;
 512
 513         if (drm_dp_is_branch(dp->panel->dpcd) && dp->link->sink_count == 0) {
 514                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 515                 if (dp->hpd_state != ST_DISCONNECTED) {
 516                         dp->hpd_state = ST_DISCONNECT_PENDING;
 517                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 518                 }
 519         } else {
 520                 if (dp->hpd_state == ST_DISCONNECTED) {
 521                         dp->hpd_state = ST_MAINLINK_READY;
 522                         rc = dp_display_process_hpd_high(dp);
 523                         if (rc)
 524                                 dp->hpd_state = ST_DISCONNECTED;
 525                 }
 526         }
 527
 528         return rc;
 529 }
 530
 531 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 532 {
 533         u32 sink_request = dp->link->sink_request;
 534
 535         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 536         if (dp->hpd_state == ST_DISCONNECTED) {
 537                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 538                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 539                                                         sink_request);
 540                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 541                         return -EINVAL;
 542                 }
 543         }
 544
 545         dp_ctrl_handle_sink_request(dp->ctrl);
 546
 547         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 548                 dp_display_handle_video_request(dp);
 549
 550         return 0;
 551 }
 552
 553 static int dp_display_usbpd_attention_cb(struct device *dev)
 554 {
 555         int rc = 0;
 556         u32 sink_request;
 557         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 558
 559         /* check for any test request issued by sink */
 560         rc = dp_link_process_request(dp->link);
 561         if (!rc) {
 562                 sink_request = dp->link->sink_request;
 563                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 564                                         dp->hpd_state, sink_request);
 565                 if (sink_request & DS_PORT_STATUS_CHANGED)
 566                         rc = dp_display_handle_port_ststus_changed(dp);
 567                 else
 568                         rc = dp_display_handle_irq_hpd(dp);
 569         }
 570
 571         return rc;
 572 }
 573
 574 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 575 {
 576         u32 state;
 577         int ret;
 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->dp_display.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         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 610                         dp->dp_display.connector_type, state);
 611         mutex_unlock(&dp->event_mutex);
 612
 613         /* uevent will complete connection part */
 614         return 0;
 615 };
 616
 617 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 618                 bool plugged)
 619 {
 620         struct dp_display_private *dp;
 621
 622         dp = container_of(dp_display,
 623                         struct dp_display_private, dp_display);
 624
 625         /* notify audio subsystem only if sink supports audio */
 626         if (dp_display->plugged_cb && dp_display->codec_dev &&
 627                         dp->audio_supported)
 628                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 629 }
 630
 631 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 632 {
 633         u32 state;
 634
 635         mutex_lock(&dp->event_mutex);
 636
 637         state = dp->hpd_state;
 638
 639         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 640                         dp->dp_display.connector_type, state);
 641
 642         /* unplugged, no more irq_hpd handle */
 643         dp_del_event(dp, EV_IRQ_HPD_INT);
 644
 645         if (state == ST_DISCONNECTED) {
 646                 /* triggered by irq_hdp with sink_count = 0 */
 647                 if (dp->link->sink_count == 0) {
 648                         dp_display_host_phy_exit(dp);
 649                 }
 650                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 651                 mutex_unlock(&dp->event_mutex);
 652                 return 0;
 653         } else if (state == ST_DISCONNECT_PENDING) {
 654                 mutex_unlock(&dp->event_mutex);
 655                 return 0;
 656         } else if (state == ST_MAINLINK_READY) {
 657                 dp_ctrl_off_link(dp->ctrl);
 658                 dp_display_host_phy_exit(dp);
 659                 dp->hpd_state = ST_DISCONNECTED;
 660                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 661                 mutex_unlock(&dp->event_mutex);
 662                 return 0;
 663         }
 664
 665         /*
 666          * We don't need separate work for disconnect as
 667          * connect/attention interrupts are disabled
 668          */
 669         dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 670
 671         if (state == ST_DISPLAY_OFF) {
 672                 dp->hpd_state = ST_DISCONNECTED;
 673         } else {
 674                 dp->hpd_state = ST_DISCONNECT_PENDING;
 675         }
 676
 677         /* signal the disconnect event early to ensure proper teardown */
 678         dp_display_handle_plugged_change(&dp->dp_display, false);
 679
 680         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 681                         dp->dp_display.connector_type, state);
 682
 683         /* uevent will complete disconnection part */
 684         mutex_unlock(&dp->event_mutex);
 685         return 0;
 686 }
 687
 688 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 689 {
 690         u32 state;
 691
 692         mutex_lock(&dp->event_mutex);
 693
 694         /* irq_hpd can happen at either connected or disconnected state */
 695         state =  dp->hpd_state;
 696         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 697                         dp->dp_display.connector_type, state);
 698
 699         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 700                 mutex_unlock(&dp->event_mutex);
 701                 return 0;
 702         }
 703
 704         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 705                 /* wait until ST_CONNECTED */
 706                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 707                 mutex_unlock(&dp->event_mutex);
 708                 return 0;
 709         }
 710
 711         dp_display_usbpd_attention_cb(&dp->dp_display.pdev->dev);
 712
 713         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 714                         dp->dp_display.connector_type, state);
 715
 716         mutex_unlock(&dp->event_mutex);
 717
 718         return 0;
 719 }
 720
 721 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 722 {
 723         dp_debug_put(dp->debug);
 724         dp_audio_put(dp->audio);
 725         dp_panel_put(dp->panel);
 726         dp_aux_put(dp->aux);
 727 }
 728
 729 static int dp_init_sub_modules(struct dp_display_private *dp)
 730 {
 731         int rc = 0;
 732         struct device *dev = &dp->dp_display.pdev->dev;
 733         struct dp_panel_in panel_in = {
 734                 .dev = dev,
 735         };
 736
 737         dp->parser = dp_parser_get(dp->dp_display.pdev);
 738         if (IS_ERR(dp->parser)) {
 739                 rc = PTR_ERR(dp->parser);
 740                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 741                 dp->parser = NULL;
 742                 goto error;
 743         }
 744
 745         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 746         if (IS_ERR(dp->catalog)) {
 747                 rc = PTR_ERR(dp->catalog);
 748                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 749                 dp->catalog = NULL;
 750                 goto error;
 751         }
 752
 753         dp->power = dp_power_get(dev, dp->parser);
 754         if (IS_ERR(dp->power)) {
 755                 rc = PTR_ERR(dp->power);
 756                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 757                 dp->power = NULL;
 758                 goto error;
 759         }
 760
 761         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 762         if (IS_ERR(dp->aux)) {
 763                 rc = PTR_ERR(dp->aux);
 764                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 765                 dp->aux = NULL;
 766                 goto error;
 767         }
 768
 769         dp->link = dp_link_get(dev, dp->aux);
 770         if (IS_ERR(dp->link)) {
 771                 rc = PTR_ERR(dp->link);
 772                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 773                 dp->link = NULL;
 774                 goto error_link;
 775         }
 776
 777         panel_in.aux = dp->aux;
 778         panel_in.catalog = dp->catalog;
 779         panel_in.link = dp->link;
 780
 781         dp->panel = dp_panel_get(&panel_in);
 782         if (IS_ERR(dp->panel)) {
 783                 rc = PTR_ERR(dp->panel);
 784                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 785                 dp->panel = NULL;
 786                 goto error_link;
 787         }
 788
 789         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 790                                dp->power, dp->catalog, dp->parser);
 791         if (IS_ERR(dp->ctrl)) {
 792                 rc = PTR_ERR(dp->ctrl);
 793                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 794                 dp->ctrl = NULL;
 795                 goto error_ctrl;
 796         }
 797
 798         dp->audio = dp_audio_get(dp->dp_display.pdev, dp->panel, dp->catalog);
 799         if (IS_ERR(dp->audio)) {
 800                 rc = PTR_ERR(dp->audio);
 801                 pr_err("failed to initialize audio, rc = %d\n", rc);
 802                 dp->audio = NULL;
 803                 goto error_ctrl;
 804         }
 805
 806         /* populate wide_bus_en to differernt layers */
 807         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 808         dp->catalog->wide_bus_en = dp->wide_bus_en;
 809
 810         return rc;
 811
 812 error_ctrl:
 813         dp_panel_put(dp->panel);
 814 error_link:
 815         dp_aux_put(dp->aux);
 816 error:
 817         return rc;
 818 }
 819
 820 static int dp_display_set_mode(struct msm_dp *dp_display,
 821                                struct dp_display_mode *mode)
 822 {
 823         struct dp_display_private *dp;
 824
 825         dp = container_of(dp_display, struct dp_display_private, dp_display);
 826
 827         drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
 828         dp->panel->dp_mode.bpp = mode->bpp;
 829         dp->panel->dp_mode.capabilities = mode->capabilities;
 830         dp_panel_init_panel_info(dp->panel);
 831         return 0;
 832 }
 833
 834 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
 835 {
 836         int rc = 0;
 837         struct msm_dp *dp_display = &dp->dp_display;
 838
 839         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 840         if (dp_display->power_on) {
 841                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 842                 return 0;
 843         }
 844
 845         rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
 846         if (!rc)
 847                 dp_display->power_on = true;
 848
 849         return rc;
 850 }
 851
 852 static int dp_display_post_enable(struct msm_dp *dp_display)
 853 {
 854         struct dp_display_private *dp;
 855         u32 rate;
 856
 857         dp = container_of(dp_display, struct dp_display_private, dp_display);
 858
 859         rate = dp->link->link_params.rate;
 860
 861         if (dp->audio_supported) {
 862                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 863                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 864         }
 865
 866         /* signal the connect event late to synchronize video and display */
 867         dp_display_handle_plugged_change(dp_display, true);
 868
 869         if (dp_display->psr_supported)
 870                 dp_ctrl_config_psr(dp->ctrl);
 871
 872         return 0;
 873 }
 874
 875 static int dp_display_disable(struct dp_display_private *dp)
 876 {
 877         struct msm_dp *dp_display = &dp->dp_display;
 878
 879         if (!dp_display->power_on)
 880                 return 0;
 881
 882         /* wait only if audio was enabled */
 883         if (dp_display->audio_enabled) {
 884                 /* signal the disconnect event */
 885                 dp_display_handle_plugged_change(dp_display, false);
 886                 if (!wait_for_completion_timeout(&dp->audio_comp,
 887                                 HZ * 5))
 888                         DRM_ERROR("audio comp timeout\n");
 889         }
 890
 891         dp_display->audio_enabled = false;
 892
 893         if (dp->link->sink_count == 0) {
 894                 /*
 895                  * irq_hpd with sink_count = 0
 896                  * hdmi unplugged out of dongle
 897                  */
 898                 dp_ctrl_off_link_stream(dp->ctrl);
 899         } else {
 900                 /*
 901                  * unplugged interrupt
 902                  * dongle unplugged out of DUT
 903                  */
 904                 dp_ctrl_off(dp->ctrl);
 905                 dp_display_host_phy_exit(dp);
 906         }
 907
 908         dp_display->power_on = false;
 909
 910         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 911         return 0;
 912 }
 913
 914 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 915                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 916 {
 917         bool plugged;
 918
 919         dp_display->plugged_cb = fn;
 920         dp_display->codec_dev = codec_dev;
 921         plugged = dp_display->is_connected;
 922         dp_display_handle_plugged_change(dp_display, plugged);
 923
 924         return 0;
 925 }
 926
 927 /**
 928  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 929  * @bridge: Pointer to drm bridge structure
 930  * @info: display info
 931  * @mode: Pointer to drm mode structure
 932  * Returns: Validity status for specified mode
 933  */
 934 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 935                                           const struct drm_display_info *info,
 936                                           const struct drm_display_mode *mode)
 937 {
 938         const u32 num_components = 3, default_bpp = 24;
 939         struct dp_display_private *dp_display;
 940         struct dp_link_info *link_info;
 941         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 942         struct msm_dp *dp;
 943         int mode_pclk_khz = mode->clock;
 944
 945         dp = to_dp_bridge(bridge)->dp_display;
 946
 947         if (!dp || !mode_pclk_khz || !dp->connector) {
 948                 DRM_ERROR("invalid params\n");
 949                 return -EINVAL;
 950         }
 951
 952         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 953                 return MODE_CLOCK_HIGH;
 954
 955         dp_display = container_of(dp, struct dp_display_private, dp_display);
 956         link_info = &dp_display->panel->link_info;
 957
 958         mode_bpp = dp->connector->display_info.bpc * num_components;
 959         if (!mode_bpp)
 960                 mode_bpp = default_bpp;
 961
 962         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
 963                         mode_bpp, mode_pclk_khz);
 964
 965         mode_rate_khz = mode_pclk_khz * mode_bpp;
 966         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
 967
 968         if (mode_rate_khz > supported_rate_khz)
 969                 return MODE_BAD;
 970
 971         return MODE_OK;
 972 }
 973
 974 int dp_display_get_modes(struct msm_dp *dp)
 975 {
 976         struct dp_display_private *dp_display;
 977
 978         if (!dp) {
 979                 DRM_ERROR("invalid params\n");
 980                 return 0;
 981         }
 982
 983         dp_display = container_of(dp, struct dp_display_private, dp_display);
 984
 985         return dp_panel_get_modes(dp_display->panel,
 986                 dp->connector);
 987 }
 988
 989 bool dp_display_check_video_test(struct msm_dp *dp)
 990 {
 991         struct dp_display_private *dp_display;
 992
 993         dp_display = container_of(dp, struct dp_display_private, dp_display);
 994
 995         return dp_display->panel->video_test;
 996 }
 997
 998 int dp_display_get_test_bpp(struct msm_dp *dp)
 999 {
1000         struct dp_display_private *dp_display;
1001
1002         if (!dp) {
1003                 DRM_ERROR("invalid params\n");
1004                 return 0;
1005         }
1006
1007         dp_display = container_of(dp, struct dp_display_private, dp_display);
1008
1009         return dp_link_bit_depth_to_bpp(
1010                 dp_display->link->test_video.test_bit_depth);
1011 }
1012
1013 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1014 {
1015         struct dp_display_private *dp_display;
1016
1017         dp_display = container_of(dp, struct dp_display_private, dp_display);
1018
1019         /*
1020          * if we are reading registers we need the link clocks to be on
1021          * however till DP cable is connected this will not happen as we
1022          * do not know the resolution to power up with. Hence check the
1023          * power_on status before dumping DP registers to avoid crash due
1024          * to unclocked access
1025          */
1026         mutex_lock(&dp_display->event_mutex);
1027
1028         if (!dp->power_on) {
1029                 mutex_unlock(&dp_display->event_mutex);
1030                 return;
1031         }
1032
1033         dp_catalog_snapshot(dp_display->catalog, disp_state);
1034
1035         mutex_unlock(&dp_display->event_mutex);
1036 }
1037
1038 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1039 {
1040         struct dp_display_private *dp;
1041
1042         if (!dp_display) {
1043                 DRM_ERROR("invalid params\n");
1044                 return;
1045         }
1046
1047         dp = container_of(dp_display, struct dp_display_private, dp_display);
1048         dp_ctrl_set_psr(dp->ctrl, enter);
1049 }
1050
1051 static int hpd_event_thread(void *data)
1052 {
1053         struct dp_display_private *dp_priv;
1054         unsigned long flag;
1055         struct dp_event *todo;
1056         int timeout_mode = 0;
1057
1058         dp_priv = (struct dp_display_private *)data;
1059
1060         while (1) {
1061                 if (timeout_mode) {
1062                         wait_event_timeout(dp_priv->event_q,
1063                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1064                                         kthread_should_stop(), EVENT_TIMEOUT);
1065                 } else {
1066                         wait_event_interruptible(dp_priv->event_q,
1067                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1068                                         kthread_should_stop());
1069                 }
1070
1071                 if (kthread_should_stop())
1072                         break;
1073
1074                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1075                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1076                 if (todo->delay) {
1077                         struct dp_event *todo_next;
1078
1079                         dp_priv->event_gndx++;
1080                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1081
1082                         /* re enter delay event into q */
1083                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1084                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1085                         todo_next->event_id = todo->event_id;
1086                         todo_next->data = todo->data;
1087                         todo_next->delay = todo->delay - 1;
1088
1089                         /* clean up older event */
1090                         todo->event_id = EV_NO_EVENT;
1091                         todo->delay = 0;
1092
1093                         /* switch to timeout mode */
1094                         timeout_mode = 1;
1095                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1096                         continue;
1097                 }
1098
1099                 /* timeout with no events in q */
1100                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1101                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1102                         continue;
1103                 }
1104
1105                 dp_priv->event_gndx++;
1106                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1107                 timeout_mode = 0;
1108                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1109
1110                 switch (todo->event_id) {
1111                 case EV_HPD_INIT_SETUP:
1112                         dp_display_host_init(dp_priv);
1113                         break;
1114                 case EV_HPD_PLUG_INT:
1115                         dp_hpd_plug_handle(dp_priv, todo->data);
1116                         break;
1117                 case EV_HPD_UNPLUG_INT:
1118                         dp_hpd_unplug_handle(dp_priv, todo->data);
1119                         break;
1120                 case EV_IRQ_HPD_INT:
1121                         dp_irq_hpd_handle(dp_priv, todo->data);
1122                         break;
1123                 case EV_USER_NOTIFICATION:
1124                         dp_display_send_hpd_notification(dp_priv,
1125                                                 todo->data);
1126                         break;
1127                 default:
1128                         break;
1129                 }
1130         }
1131
1132         return 0;
1133 }
1134
1135 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1136 {
1137         /* set event q to empty */
1138         dp_priv->event_gndx = 0;
1139         dp_priv->event_pndx = 0;
1140
1141         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1142         if (IS_ERR(dp_priv->ev_tsk))
1143                 return PTR_ERR(dp_priv->ev_tsk);
1144
1145         return 0;
1146 }
1147
1148 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1149 {
1150         struct dp_display_private *dp = dev_id;
1151         irqreturn_t ret = IRQ_NONE;
1152         u32 hpd_isr_status;
1153
1154         if (!dp) {
1155                 DRM_ERROR("invalid data\n");
1156                 return IRQ_NONE;
1157         }
1158
1159         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1160
1161         if (hpd_isr_status & 0x0F) {
1162                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1163                         dp->dp_display.connector_type, hpd_isr_status);
1164                 /* hpd related interrupts */
1165                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1166                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1167
1168                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1169                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1170                 }
1171
1172                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1173                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1174                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1175                 }
1176
1177                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1178                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1179
1180                 ret = IRQ_HANDLED;
1181         }
1182
1183         /* DP controller isr */
1184         ret |= dp_ctrl_isr(dp->ctrl);
1185
1186         /* DP aux isr */
1187         ret |= dp_aux_isr(dp->aux);
1188
1189         return ret;
1190 }
1191
1192 int dp_display_request_irq(struct msm_dp *dp_display)
1193 {
1194         int rc = 0;
1195         struct dp_display_private *dp;
1196
1197         if (!dp_display) {
1198                 DRM_ERROR("invalid input\n");
1199                 return -EINVAL;
1200         }
1201
1202         dp = container_of(dp_display, struct dp_display_private, dp_display);
1203
1204         dp->irq = irq_of_parse_and_map(dp->dp_display.pdev->dev.of_node, 0);
1205         if (!dp->irq) {
1206                 DRM_ERROR("failed to get irq\n");
1207                 return -EINVAL;
1208         }
1209
1210         rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
1211                         dp_display_irq_handler,
1212                         IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1213         if (rc < 0) {
1214                 DRM_ERROR("failed to request IRQ%u: %d\n",
1215                                 dp->irq, rc);
1216                 return rc;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1223 {
1224         const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1225         struct resource *res;
1226         int i;
1227
1228         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1229         if (!res)
1230                 return NULL;
1231
1232         for (i = 0; i < descs[i].io_start; i++) {
1233                 if (descs[i].io_start == res->start)
1234                         return &descs[i];
1235         }
1236
1237         dev_err(&pdev->dev, "unknown displayport instance\n");
1238         return NULL;
1239 }
1240
1241 static int dp_display_probe(struct platform_device *pdev)
1242 {
1243         int rc = 0;
1244         struct dp_display_private *dp;
1245         const struct msm_dp_desc *desc;
1246
1247         if (!pdev || !pdev->dev.of_node) {
1248                 DRM_ERROR("pdev not found\n");
1249                 return -ENODEV;
1250         }
1251
1252         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1253         if (!dp)
1254                 return -ENOMEM;
1255
1256         desc = dp_display_get_desc(pdev);
1257         if (!desc)
1258                 return -EINVAL;
1259
1260         dp->dp_display.pdev = pdev;
1261         dp->name = "drm_dp";
1262         dp->id = desc->id;
1263         dp->dp_display.connector_type = desc->connector_type;
1264         dp->wide_bus_en = desc->wide_bus_en;
1265         dp->dp_display.is_edp =
1266                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1267
1268         rc = dp_init_sub_modules(dp);
1269         if (rc) {
1270                 DRM_ERROR("init sub module failed\n");
1271                 return -EPROBE_DEFER;
1272         }
1273
1274         /* setup event q */
1275         mutex_init(&dp->event_mutex);
1276         init_waitqueue_head(&dp->event_q);
1277         spin_lock_init(&dp->event_lock);
1278
1279         /* Store DP audio handle inside DP display */
1280         dp->dp_display.dp_audio = dp->audio;
1281
1282         init_completion(&dp->audio_comp);
1283
1284         platform_set_drvdata(pdev, &dp->dp_display);
1285
1286         rc = component_add(&pdev->dev, &dp_display_comp_ops);
1287         if (rc) {
1288                 DRM_ERROR("component add failed, rc=%d\n", rc);
1289                 dp_display_deinit_sub_modules(dp);
1290         }
1291
1292         return rc;
1293 }
1294
1295 static void dp_display_remove(struct platform_device *pdev)
1296 {
1297         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1298
1299         component_del(&pdev->dev, &dp_display_comp_ops);
1300         dp_display_deinit_sub_modules(dp);
1301
1302         platform_set_drvdata(pdev, NULL);
1303 }
1304
1305 static int dp_pm_resume(struct device *dev)
1306 {
1307         struct platform_device *pdev = to_platform_device(dev);
1308         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1309         struct dp_display_private *dp;
1310         int sink_count = 0;
1311
1312         dp = container_of(dp_display, struct dp_display_private, dp_display);
1313
1314         mutex_lock(&dp->event_mutex);
1315
1316         drm_dbg_dp(dp->drm_dev,
1317                 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1318                 dp->dp_display.connector_type, dp->core_initialized,
1319                 dp->phy_initialized, dp_display->power_on);
1320
1321         /* start from disconnected state */
1322         dp->hpd_state = ST_DISCONNECTED;
1323
1324         /* turn on dp ctrl/phy */
1325         dp_display_host_init(dp);
1326
1327         if (dp_display->is_edp)
1328                 dp_catalog_ctrl_hpd_enable(dp->catalog);
1329
1330         if (dp_catalog_link_is_connected(dp->catalog)) {
1331                 /*
1332                  * set sink to normal operation mode -- D0
1333                  * before dpcd read
1334                  */
1335                 dp_display_host_phy_init(dp);
1336                 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1337                 sink_count = drm_dp_read_sink_count(dp->aux);
1338                 if (sink_count < 0)
1339                         sink_count = 0;
1340
1341                 dp_display_host_phy_exit(dp);
1342         }
1343
1344         dp->link->sink_count = sink_count;
1345         /*
1346          * can not declared display is connected unless
1347          * HDMI cable is plugged in and sink_count of
1348          * dongle become 1
1349          * also only signal audio when disconnected
1350          */
1351         if (dp->link->sink_count) {
1352                 dp->dp_display.is_connected = true;
1353         } else {
1354                 dp->dp_display.is_connected = false;
1355                 dp_display_handle_plugged_change(dp_display, false);
1356         }
1357
1358         drm_dbg_dp(dp->drm_dev,
1359                 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1360                 dp->dp_display.connector_type, dp->link->sink_count,
1361                 dp->dp_display.is_connected, dp->core_initialized,
1362                 dp->phy_initialized, dp_display->power_on);
1363
1364         mutex_unlock(&dp->event_mutex);
1365
1366         return 0;
1367 }
1368
1369 static int dp_pm_suspend(struct device *dev)
1370 {
1371         struct platform_device *pdev = to_platform_device(dev);
1372         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1373         struct dp_display_private *dp;
1374
1375         dp = container_of(dp_display, struct dp_display_private, dp_display);
1376
1377         mutex_lock(&dp->event_mutex);
1378
1379         drm_dbg_dp(dp->drm_dev,
1380                 "Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
1381                 dp->dp_display.connector_type, dp->core_initialized,
1382                 dp->phy_initialized, dp_display->power_on);
1383
1384         /* mainlink enabled */
1385         if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1386                 dp_ctrl_off_link_stream(dp->ctrl);
1387
1388         dp_display_host_phy_exit(dp);
1389
1390         /* host_init will be called at pm_resume */
1391         dp_display_host_deinit(dp);
1392
1393         dp->hpd_state = ST_SUSPENDED;
1394
1395         drm_dbg_dp(dp->drm_dev,
1396                 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1397                 dp->dp_display.connector_type, dp->core_initialized,
1398                 dp->phy_initialized, dp_display->power_on);
1399
1400         mutex_unlock(&dp->event_mutex);
1401
1402         return 0;
1403 }
1404
1405 static const struct dev_pm_ops dp_pm_ops = {
1406         .suspend = dp_pm_suspend,
1407         .resume =  dp_pm_resume,
1408 };
1409
1410 static struct platform_driver dp_display_driver = {
1411         .probe  = dp_display_probe,
1412         .remove_new = dp_display_remove,
1413         .driver = {
1414                 .name = "msm-dp-display",
1415                 .of_match_table = dp_dt_match,
1416                 .suppress_bind_attrs = true,
1417                 .pm = &dp_pm_ops,
1418         },
1419 };
1420
1421 int __init msm_dp_register(void)
1422 {
1423         int ret;
1424
1425         ret = platform_driver_register(&dp_display_driver);
1426         if (ret)
1427                 DRM_ERROR("Dp display driver register failed");
1428
1429         return ret;
1430 }
1431
1432 void __exit msm_dp_unregister(void)
1433 {
1434         platform_driver_unregister(&dp_display_driver);
1435 }
1436
1437 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1438 {
1439         struct dp_display_private *dp;
1440
1441         if (!dp_display)
1442                 return;
1443
1444         dp = container_of(dp_display, struct dp_display_private, dp_display);
1445
1446         if (!dp_display->is_edp)
1447                 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
1448 }
1449
1450 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1451 {
1452         struct dp_display_private *dp;
1453
1454         dp = container_of(dp_display, struct dp_display_private, dp_display);
1455
1456         return dp->wide_bus_en;
1457 }
1458
1459 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1460 {
1461         struct dp_display_private *dp;
1462         struct device *dev;
1463         int rc;
1464
1465         dp = container_of(dp_display, struct dp_display_private, dp_display);
1466         dev = &dp->dp_display.pdev->dev;
1467
1468         dp->debug = dp_debug_get(dev, dp->panel,
1469                                         dp->link, dp->dp_display.connector,
1470                                         minor);
1471         if (IS_ERR(dp->debug)) {
1472                 rc = PTR_ERR(dp->debug);
1473                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1474                 dp->debug = NULL;
1475         }
1476 }
1477
1478 static int dp_display_get_next_bridge(struct msm_dp *dp)
1479 {
1480         int rc;
1481         struct dp_display_private *dp_priv;
1482         struct device_node *aux_bus;
1483         struct device *dev;
1484
1485         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1486         dev = &dp_priv->dp_display.pdev->dev;
1487         aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1488
1489         if (aux_bus && dp->is_edp) {
1490                 dp_display_host_init(dp_priv);
1491                 dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
1492                 dp_display_host_phy_init(dp_priv);
1493
1494                 /*
1495                  * The code below assumes that the panel will finish probing
1496                  * by the time devm_of_dp_aux_populate_ep_devices() returns.
1497                  * This isn't a great assumption since it will fail if the
1498                  * panel driver is probed asynchronously but is the best we
1499                  * can do without a bigger driver reorganization.
1500                  */
1501                 rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
1502                 of_node_put(aux_bus);
1503                 if (rc)
1504                         goto error;
1505         } else if (dp->is_edp) {
1506                 DRM_ERROR("eDP aux_bus not found\n");
1507                 return -ENODEV;
1508         }
1509
1510         /*
1511          * External bridges are mandatory for eDP interfaces: one has to
1512          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1513          *
1514          * For DisplayPort interfaces external bridges are optional, so
1515          * silently ignore an error if one is not present (-ENODEV).
1516          */
1517         rc = devm_dp_parser_find_next_bridge(dp->drm_dev->dev, dp_priv->parser);
1518         if (!dp->is_edp && rc == -ENODEV)
1519                 return 0;
1520
1521         if (!rc) {
1522                 dp->next_bridge = dp_priv->parser->next_bridge;
1523                 return 0;
1524         }
1525
1526 error:
1527         if (dp->is_edp) {
1528                 of_dp_aux_depopulate_bus(dp_priv->aux);
1529                 dp_display_host_phy_exit(dp_priv);
1530                 dp_display_host_deinit(dp_priv);
1531         }
1532         return rc;
1533 }
1534
1535 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1536                         struct drm_encoder *encoder)
1537 {
1538         struct dp_display_private *dp_priv;
1539         int ret;
1540
1541         dp_display->drm_dev = dev;
1542
1543         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1544
1545         ret = dp_display_request_irq(dp_display);
1546         if (ret) {
1547                 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1548                 return ret;
1549         }
1550
1551         ret = dp_display_get_next_bridge(dp_display);
1552         if (ret)
1553                 return ret;
1554
1555         ret = dp_bridge_init(dp_display, dev, encoder);
1556         if (ret) {
1557                 DRM_DEV_ERROR(dev->dev,
1558                         "failed to create dp bridge: %d\n", ret);
1559                 return ret;
1560         }
1561
1562         dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1563         if (IS_ERR(dp_display->connector)) {
1564                 ret = PTR_ERR(dp_display->connector);
1565                 DRM_DEV_ERROR(dev->dev,
1566                         "failed to create dp connector: %d\n", ret);
1567                 dp_display->connector = NULL;
1568                 return ret;
1569         }
1570
1571         dp_priv->panel->connector = dp_display->connector;
1572
1573         return 0;
1574 }
1575
1576 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1577                              struct drm_bridge_state *old_bridge_state)
1578 {
1579         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1580         struct msm_dp *dp = dp_bridge->dp_display;
1581         int rc = 0;
1582         struct dp_display_private *dp_display;
1583         u32 state;
1584         bool force_link_train = false;
1585
1586         dp_display = container_of(dp, struct dp_display_private, dp_display);
1587         if (!dp_display->dp_mode.drm_mode.clock) {
1588                 DRM_ERROR("invalid params\n");
1589                 return;
1590         }
1591
1592         if (dp->is_edp)
1593                 dp_hpd_plug_handle(dp_display, 0);
1594
1595         mutex_lock(&dp_display->event_mutex);
1596
1597         state = dp_display->hpd_state;
1598         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1599                 mutex_unlock(&dp_display->event_mutex);
1600                 return;
1601         }
1602
1603         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1604         if (rc) {
1605                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1606                 mutex_unlock(&dp_display->event_mutex);
1607                 return;
1608         }
1609
1610         state =  dp_display->hpd_state;
1611
1612         if (state == ST_DISPLAY_OFF) {
1613                 dp_display_host_phy_init(dp_display);
1614                 force_link_train = true;
1615         }
1616
1617         dp_display_enable(dp_display, force_link_train);
1618
1619         rc = dp_display_post_enable(dp);
1620         if (rc) {
1621                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1622                 dp_display_disable(dp_display);
1623         }
1624
1625         /* completed connection */
1626         dp_display->hpd_state = ST_CONNECTED;
1627
1628         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1629         mutex_unlock(&dp_display->event_mutex);
1630 }
1631
1632 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1633                               struct drm_bridge_state *old_bridge_state)
1634 {
1635         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1636         struct msm_dp *dp = dp_bridge->dp_display;
1637         struct dp_display_private *dp_display;
1638
1639         dp_display = container_of(dp, struct dp_display_private, dp_display);
1640
1641         dp_ctrl_push_idle(dp_display->ctrl);
1642 }
1643
1644 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1645                                    struct drm_bridge_state *old_bridge_state)
1646 {
1647         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1648         struct msm_dp *dp = dp_bridge->dp_display;
1649         u32 state;
1650         struct dp_display_private *dp_display;
1651
1652         dp_display = container_of(dp, struct dp_display_private, dp_display);
1653
1654         if (dp->is_edp)
1655                 dp_hpd_unplug_handle(dp_display, 0);
1656
1657         mutex_lock(&dp_display->event_mutex);
1658
1659         state = dp_display->hpd_state;
1660         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1661                 mutex_unlock(&dp_display->event_mutex);
1662                 return;
1663         }
1664
1665         dp_display_disable(dp_display);
1666
1667         state =  dp_display->hpd_state;
1668         if (state == ST_DISCONNECT_PENDING) {
1669                 /* completed disconnection */
1670                 dp_display->hpd_state = ST_DISCONNECTED;
1671         } else {
1672                 dp_display->hpd_state = ST_DISPLAY_OFF;
1673         }
1674
1675         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1676         mutex_unlock(&dp_display->event_mutex);
1677 }
1678
1679 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1680                         const struct drm_display_mode *mode,
1681                         const struct drm_display_mode *adjusted_mode)
1682 {
1683         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1684         struct msm_dp *dp = dp_bridge->dp_display;
1685         struct dp_display_private *dp_display;
1686
1687         dp_display = container_of(dp, struct dp_display_private, dp_display);
1688
1689         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1690
1691         if (dp_display_check_video_test(dp))
1692                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1693         else /* Default num_components per pixel = 3 */
1694                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1695
1696         if (!dp_display->dp_mode.bpp)
1697                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1698
1699         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1700
1701         dp_display->dp_mode.v_active_low =
1702                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1703
1704         dp_display->dp_mode.h_active_low =
1705                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1706 }
1707
1708 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1709 {
1710         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1711         struct msm_dp *dp_display = dp_bridge->dp_display;
1712         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1713
1714         mutex_lock(&dp->event_mutex);
1715         dp_catalog_ctrl_hpd_enable(dp->catalog);
1716
1717         /* enable HDP interrupts */
1718         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1719
1720         dp_display->internal_hpd = true;
1721         mutex_unlock(&dp->event_mutex);
1722 }
1723
1724 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1725 {
1726         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1727         struct msm_dp *dp_display = dp_bridge->dp_display;
1728         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1729
1730         mutex_lock(&dp->event_mutex);
1731         /* disable HDP interrupts */
1732         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1733         dp_catalog_ctrl_hpd_disable(dp->catalog);
1734
1735         dp_display->internal_hpd = false;
1736         mutex_unlock(&dp->event_mutex);
1737 }
1738
1739 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1740                           enum drm_connector_status status)
1741 {
1742         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1743         struct msm_dp *dp_display = dp_bridge->dp_display;
1744         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1745
1746         /* Without next_bridge interrupts are handled by the DP core directly */
1747         if (dp_display->internal_hpd)
1748                 return;
1749
1750         if (!dp->core_initialized) {
1751                 drm_dbg_dp(dp->drm_dev, "not initialized\n");
1752                 return;
1753         }
1754
1755         if (!dp_display->is_connected && status == connector_status_connected)
1756                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1757         else if (dp_display->is_connected && status == connector_status_disconnected)
1758                 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1759 }