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 #include <drm/drm_edid.h>
  15
  16 #include "msm_drv.h"
  17 #include "msm_kms.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 static bool psr_enabled = false;
  32 module_param(psr_enabled, bool, 0);
  33 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
  34
  35 #define HPD_STRING_SIZE 30
  36
  37 enum {
  38         ISR_DISCONNECTED,
  39         ISR_CONNECT_PENDING,
  40         ISR_CONNECTED,
  41         ISR_HPD_REPLUG_COUNT,
  42         ISR_IRQ_HPD_PULSE_COUNT,
  43         ISR_HPD_LO_GLITH_COUNT,
  44 };
  45
  46 /* event thread connection state */
  47 enum {
  48         ST_DISCONNECTED,
  49         ST_MAINLINK_READY,
  50         ST_CONNECTED,
  51         ST_DISCONNECT_PENDING,
  52         ST_DISPLAY_OFF,
  53 };
  54
  55 enum {
  56         EV_NO_EVENT,
  57         /* hpd events */
  58         EV_HPD_PLUG_INT,
  59         EV_IRQ_HPD_INT,
  60         EV_HPD_UNPLUG_INT,
  61         EV_USER_NOTIFICATION,
  62 };
  63
  64 #define EVENT_TIMEOUT   (HZ/10) /* 100ms */
  65 #define DP_EVENT_Q_MAX  8
  66
  67 #define DP_TIMEOUT_NONE         0
  68
  69 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  70
  71 struct dp_event {
  72         u32 event_id;
  73         u32 data;
  74         u32 delay;
  75 };
  76
  77 struct dp_display_private {
  78         char *name;
  79         int irq;
  80
  81         unsigned int id;
  82
  83         /* state variables */
  84         bool core_initialized;
  85         bool phy_initialized;
  86         bool hpd_irq_on;
  87         bool audio_supported;
  88
  89         struct drm_device *drm_dev;
  90         struct dentry *root;
  91
  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_display_mode dp_mode;
 102         struct msm_dp dp_display;
 103
 104         /* wait for audio signaling */
 105         struct completion audio_comp;
 106
 107         /* event related only access by event thread */
 108         struct mutex event_mutex;
 109         wait_queue_head_t event_q;
 110         u32 hpd_state;
 111         u32 event_pndx;
 112         u32 event_gndx;
 113         struct task_struct *ev_tsk;
 114         struct dp_event event_list[DP_EVENT_Q_MAX];
 115         spinlock_t event_lock;
 116
 117         bool wide_bus_en;
 118
 119         struct dp_audio *audio;
 120 };
 121
 122 struct msm_dp_desc {
 123         phys_addr_t io_start;
 124         unsigned int id;
 125         unsigned int connector_type;
 126         bool wide_bus_en;
 127 };
 128
 129 static const struct msm_dp_desc sc7180_dp_descs[] = {
 130         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 131         {}
 132 };
 133
 134 static const struct msm_dp_desc sc7280_dp_descs[] = {
 135         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 136         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 137         {}
 138 };
 139
 140 static const struct msm_dp_desc sc8180x_dp_descs[] = {
 141         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 142         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 143         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
 144         {}
 145 };
 146
 147 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
 148         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 149         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 150         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 151         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 152         { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 153         { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 154         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 155         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 156         {}
 157 };
 158
 159 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
 160         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 161         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 162         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 163         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 164         {}
 165 };
 166
 167 static const struct msm_dp_desc sm8350_dp_descs[] = {
 168         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 169         {}
 170 };
 171
 172 static const struct msm_dp_desc sm8650_dp_descs[] = {
 173         { .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 174         {}
 175 };
 176
 177 static const struct of_device_id dp_dt_match[] = {
 178         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
 179         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
 180         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
 181         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
 182         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
 183         { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
 184         { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
 185         { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
 186         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
 187         { .compatible = "qcom,sm8650-dp", .data = &sm8650_dp_descs },
 188         {}
 189 };
 190
 191 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 192 {
 193         struct msm_dp *dp = dev_get_drvdata(dev);
 194
 195         return container_of(dp, struct dp_display_private, dp_display);
 196 }
 197
 198 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 199                                                 u32 data, u32 delay)
 200 {
 201         unsigned long flag;
 202         struct dp_event *todo;
 203         int pndx;
 204
 205         spin_lock_irqsave(&dp_priv->event_lock, flag);
 206         pndx = dp_priv->event_pndx + 1;
 207         pndx %= DP_EVENT_Q_MAX;
 208         if (pndx == dp_priv->event_gndx) {
 209                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 210                         dp_priv->event_pndx, dp_priv->event_gndx);
 211                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 212                 return -EPERM;
 213         }
 214         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 215         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 216         todo->event_id = event;
 217         todo->data = data;
 218         todo->delay = delay;
 219         wake_up(&dp_priv->event_q);
 220         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 221
 222         return 0;
 223 }
 224
 225 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 226 {
 227         unsigned long flag;
 228         struct dp_event *todo;
 229         u32     gndx;
 230
 231         spin_lock_irqsave(&dp_priv->event_lock, flag);
 232         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 233                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 234                 return -ENOENT;
 235         }
 236
 237         gndx = dp_priv->event_gndx;
 238         while (dp_priv->event_pndx != gndx) {
 239                 todo = &dp_priv->event_list[gndx];
 240                 if (todo->event_id == event) {
 241                         todo->event_id = EV_NO_EVENT;   /* deleted */
 242                         todo->delay = 0;
 243                 }
 244                 gndx++;
 245                 gndx %= DP_EVENT_Q_MAX;
 246         }
 247         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 248
 249         return 0;
 250 }
 251
 252 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 253 {
 254         struct dp_display_private *dp;
 255
 256         dp = container_of(dp_display, struct dp_display_private, dp_display);
 257
 258         reinit_completion(&dp->audio_comp);
 259 }
 260
 261 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 262 {
 263         struct dp_display_private *dp;
 264
 265         dp = container_of(dp_display, struct dp_display_private, dp_display);
 266
 267         complete_all(&dp->audio_comp);
 268 }
 269
 270 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 271
 272 static int dp_display_bind(struct device *dev, struct device *master,
 273                            void *data)
 274 {
 275         int rc = 0;
 276         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 277         struct msm_drm_private *priv = dev_get_drvdata(master);
 278         struct drm_device *drm = priv->dev;
 279
 280         dp->dp_display.drm_dev = drm;
 281         priv->dp[dp->id] = &dp->dp_display;
 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
 294         rc = dp_register_audio_driver(dev, dp->audio);
 295         if (rc) {
 296                 DRM_ERROR("Audio registration Dp failed\n");
 297                 goto end;
 298         }
 299
 300         rc = dp_hpd_event_thread_start(dp);
 301         if (rc) {
 302                 DRM_ERROR("Event thread create failed\n");
 303                 goto end;
 304         }
 305
 306         return 0;
 307 end:
 308         return rc;
 309 }
 310
 311 static void dp_display_unbind(struct device *dev, struct device *master,
 312                               void *data)
 313 {
 314         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 315         struct msm_drm_private *priv = dev_get_drvdata(master);
 316
 317         kthread_stop(dp->ev_tsk);
 318
 319         of_dp_aux_depopulate_bus(dp->aux);
 320
 321         dp_unregister_audio_driver(dev, dp->audio);
 322         dp_aux_unregister(dp->aux);
 323         dp->drm_dev = NULL;
 324         dp->aux->drm_dev = NULL;
 325         priv->dp[dp->id] = NULL;
 326 }
 327
 328 static const struct component_ops dp_display_comp_ops = {
 329         .bind = dp_display_bind,
 330         .unbind = dp_display_unbind,
 331 };
 332
 333 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 334                                             bool hpd)
 335 {
 336         struct drm_bridge *bridge = dp->dp_display.bridge;
 337
 338         /* reset video pattern flag on disconnect */
 339         if (!hpd) {
 340                 dp->panel->video_test = false;
 341                 if (!dp->dp_display.is_edp)
 342                         drm_dp_set_subconnector_property(dp->dp_display.connector,
 343                                                          connector_status_disconnected,
 344                                                          dp->panel->dpcd,
 345                                                          dp->panel->downstream_ports);
 346         }
 347
 348         dp->dp_display.link_ready = hpd;
 349
 350         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 351                         dp->dp_display.connector_type, hpd);
 352         drm_bridge_hpd_notify(bridge, dp->dp_display.link_ready);
 353
 354         return 0;
 355 }
 356
 357 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 358 {
 359         int rc = 0;
 360         struct edid *edid;
 361
 362         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 363         dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
 364
 365         drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
 366                 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
 367
 368         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 369         if (rc)
 370                 goto end;
 371
 372         dp_link_process_request(dp->link);
 373
 374         if (!dp->dp_display.is_edp)
 375                 drm_dp_set_subconnector_property(dp->dp_display.connector,
 376                                                  connector_status_connected,
 377                                                  dp->panel->dpcd,
 378                                                  dp->panel->downstream_ports);
 379
 380         edid = dp->panel->edid;
 381
 382         dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
 383
 384         dp->audio_supported = drm_detect_monitor_audio(edid);
 385         dp_panel_handle_sink_request(dp->panel);
 386
 387         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 388
 389         /*
 390          * set sink to normal operation mode -- D0
 391          * before dpcd read
 392          */
 393         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 394
 395         dp_link_reset_phy_params_vx_px(dp->link);
 396         rc = dp_ctrl_on_link(dp->ctrl);
 397         if (rc) {
 398                 DRM_ERROR("failed to complete DP link training\n");
 399                 goto end;
 400         }
 401
 402         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 403
 404 end:
 405         return rc;
 406 }
 407
 408 static void dp_display_host_phy_init(struct dp_display_private *dp)
 409 {
 410         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 411                 dp->dp_display.connector_type, dp->core_initialized,
 412                 dp->phy_initialized);
 413
 414         if (!dp->phy_initialized) {
 415                 dp_ctrl_phy_init(dp->ctrl);
 416                 dp->phy_initialized = true;
 417         }
 418 }
 419
 420 static void dp_display_host_phy_exit(struct dp_display_private *dp)
 421 {
 422         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 423                 dp->dp_display.connector_type, dp->core_initialized,
 424                 dp->phy_initialized);
 425
 426         if (dp->phy_initialized) {
 427                 dp_ctrl_phy_exit(dp->ctrl);
 428                 dp->phy_initialized = false;
 429         }
 430 }
 431
 432 static void dp_display_host_init(struct dp_display_private *dp)
 433 {
 434         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 435                 dp->dp_display.connector_type, dp->core_initialized,
 436                 dp->phy_initialized);
 437
 438         dp_power_init(dp->power);
 439         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 440         dp_aux_init(dp->aux);
 441         dp->core_initialized = true;
 442 }
 443
 444 static void dp_display_host_deinit(struct dp_display_private *dp)
 445 {
 446         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 447                 dp->dp_display.connector_type, dp->core_initialized,
 448                 dp->phy_initialized);
 449
 450         dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
 451         dp_aux_deinit(dp->aux);
 452         dp_power_deinit(dp->power);
 453         dp->core_initialized = false;
 454 }
 455
 456 static int dp_display_usbpd_configure_cb(struct device *dev)
 457 {
 458         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 459
 460         dp_display_host_phy_init(dp);
 461
 462         return dp_display_process_hpd_high(dp);
 463 }
 464
 465 static int dp_display_notify_disconnect(struct device *dev)
 466 {
 467         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 468
 469         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 470
 471         return 0;
 472 }
 473
 474 static void dp_display_handle_video_request(struct dp_display_private *dp)
 475 {
 476         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 477                 dp->panel->video_test = true;
 478                 dp_link_send_test_response(dp->link);
 479         }
 480 }
 481
 482 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 483 {
 484         int rc = 0;
 485
 486         if (drm_dp_is_branch(dp->panel->dpcd) && dp->link->sink_count == 0) {
 487                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 488                 if (dp->hpd_state != ST_DISCONNECTED) {
 489                         dp->hpd_state = ST_DISCONNECT_PENDING;
 490                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 491                 }
 492         } else {
 493                 if (dp->hpd_state == ST_DISCONNECTED) {
 494                         dp->hpd_state = ST_MAINLINK_READY;
 495                         rc = dp_display_process_hpd_high(dp);
 496                         if (rc)
 497                                 dp->hpd_state = ST_DISCONNECTED;
 498                 }
 499         }
 500
 501         return rc;
 502 }
 503
 504 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 505 {
 506         u32 sink_request = dp->link->sink_request;
 507
 508         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 509         if (dp->hpd_state == ST_DISCONNECTED) {
 510                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 511                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 512                                                         sink_request);
 513                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 514                         return -EINVAL;
 515                 }
 516         }
 517
 518         dp_ctrl_handle_sink_request(dp->ctrl);
 519
 520         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 521                 dp_display_handle_video_request(dp);
 522
 523         return 0;
 524 }
 525
 526 static int dp_display_usbpd_attention_cb(struct device *dev)
 527 {
 528         int rc = 0;
 529         u32 sink_request;
 530         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 531
 532         /* check for any test request issued by sink */
 533         rc = dp_link_process_request(dp->link);
 534         if (!rc) {
 535                 sink_request = dp->link->sink_request;
 536                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 537                                         dp->hpd_state, sink_request);
 538                 if (sink_request & DS_PORT_STATUS_CHANGED)
 539                         rc = dp_display_handle_port_ststus_changed(dp);
 540                 else
 541                         rc = dp_display_handle_irq_hpd(dp);
 542         }
 543
 544         return rc;
 545 }
 546
 547 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 548 {
 549         u32 state;
 550         int ret;
 551         struct platform_device *pdev = dp->dp_display.pdev;
 552
 553         mutex_lock(&dp->event_mutex);
 554
 555         state =  dp->hpd_state;
 556         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 557                         dp->dp_display.connector_type, state);
 558
 559         if (state == ST_DISPLAY_OFF) {
 560                 mutex_unlock(&dp->event_mutex);
 561                 return 0;
 562         }
 563
 564         if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
 565                 mutex_unlock(&dp->event_mutex);
 566                 return 0;
 567         }
 568
 569         if (state == ST_DISCONNECT_PENDING) {
 570                 /* wait until ST_DISCONNECTED */
 571                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
 572                 mutex_unlock(&dp->event_mutex);
 573                 return 0;
 574         }
 575
 576         ret = pm_runtime_resume_and_get(&pdev->dev);
 577         if (ret) {
 578                 DRM_ERROR("failed to pm_runtime_resume\n");
 579                 mutex_unlock(&dp->event_mutex);
 580                 return ret;
 581         }
 582
 583         ret = dp_display_usbpd_configure_cb(&pdev->dev);
 584         if (ret) {      /* link train failed */
 585                 dp->hpd_state = ST_DISCONNECTED;
 586         } else {
 587                 dp->hpd_state = ST_MAINLINK_READY;
 588         }
 589
 590         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 591                         dp->dp_display.connector_type, state);
 592         mutex_unlock(&dp->event_mutex);
 593
 594         /* uevent will complete connection part */
 595         return 0;
 596 };
 597
 598 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 599                 bool plugged)
 600 {
 601         struct dp_display_private *dp;
 602
 603         dp = container_of(dp_display,
 604                         struct dp_display_private, dp_display);
 605
 606         /* notify audio subsystem only if sink supports audio */
 607         if (dp_display->plugged_cb && dp_display->codec_dev &&
 608                         dp->audio_supported)
 609                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 610 }
 611
 612 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 613 {
 614         u32 state;
 615         struct platform_device *pdev = dp->dp_display.pdev;
 616
 617         mutex_lock(&dp->event_mutex);
 618
 619         state = dp->hpd_state;
 620
 621         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 622                         dp->dp_display.connector_type, state);
 623
 624         /* unplugged, no more irq_hpd handle */
 625         dp_del_event(dp, EV_IRQ_HPD_INT);
 626
 627         if (state == ST_DISCONNECTED) {
 628                 /* triggered by irq_hdp with sink_count = 0 */
 629                 if (dp->link->sink_count == 0) {
 630                         dp_display_host_phy_exit(dp);
 631                 }
 632                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 633                 mutex_unlock(&dp->event_mutex);
 634                 return 0;
 635         } else if (state == ST_DISCONNECT_PENDING) {
 636                 mutex_unlock(&dp->event_mutex);
 637                 return 0;
 638         } else if (state == ST_MAINLINK_READY) {
 639                 dp_ctrl_off_link(dp->ctrl);
 640                 dp_display_host_phy_exit(dp);
 641                 dp->hpd_state = ST_DISCONNECTED;
 642                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 643                 mutex_unlock(&dp->event_mutex);
 644                 return 0;
 645         }
 646
 647         /*
 648          * We don't need separate work for disconnect as
 649          * connect/attention interrupts are disabled
 650          */
 651         dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 652
 653         if (state == ST_DISPLAY_OFF) {
 654                 dp->hpd_state = ST_DISCONNECTED;
 655         } else {
 656                 dp->hpd_state = ST_DISCONNECT_PENDING;
 657         }
 658
 659         /* signal the disconnect event early to ensure proper teardown */
 660         dp_display_handle_plugged_change(&dp->dp_display, false);
 661
 662         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 663                         dp->dp_display.connector_type, state);
 664
 665         /* uevent will complete disconnection part */
 666         pm_runtime_put_sync(&pdev->dev);
 667         mutex_unlock(&dp->event_mutex);
 668         return 0;
 669 }
 670
 671 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 672 {
 673         u32 state;
 674
 675         mutex_lock(&dp->event_mutex);
 676
 677         /* irq_hpd can happen at either connected or disconnected state */
 678         state =  dp->hpd_state;
 679         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 680                         dp->dp_display.connector_type, state);
 681
 682         if (state == ST_DISPLAY_OFF) {
 683                 mutex_unlock(&dp->event_mutex);
 684                 return 0;
 685         }
 686
 687         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 688                 /* wait until ST_CONNECTED */
 689                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 690                 mutex_unlock(&dp->event_mutex);
 691                 return 0;
 692         }
 693
 694         dp_display_usbpd_attention_cb(&dp->dp_display.pdev->dev);
 695
 696         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 697                         dp->dp_display.connector_type, state);
 698
 699         mutex_unlock(&dp->event_mutex);
 700
 701         return 0;
 702 }
 703
 704 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 705 {
 706         dp_audio_put(dp->audio);
 707         dp_panel_put(dp->panel);
 708         dp_aux_put(dp->aux);
 709 }
 710
 711 static int dp_init_sub_modules(struct dp_display_private *dp)
 712 {
 713         int rc = 0;
 714         struct device *dev = &dp->dp_display.pdev->dev;
 715         struct dp_panel_in panel_in = {
 716                 .dev = dev,
 717         };
 718
 719         dp->parser = dp_parser_get(dp->dp_display.pdev);
 720         if (IS_ERR(dp->parser)) {
 721                 rc = PTR_ERR(dp->parser);
 722                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 723                 dp->parser = NULL;
 724                 goto error;
 725         }
 726
 727         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 728         if (IS_ERR(dp->catalog)) {
 729                 rc = PTR_ERR(dp->catalog);
 730                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 731                 dp->catalog = NULL;
 732                 goto error;
 733         }
 734
 735         dp->power = dp_power_get(dev, dp->parser);
 736         if (IS_ERR(dp->power)) {
 737                 rc = PTR_ERR(dp->power);
 738                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 739                 dp->power = NULL;
 740                 goto error;
 741         }
 742
 743         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 744         if (IS_ERR(dp->aux)) {
 745                 rc = PTR_ERR(dp->aux);
 746                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 747                 dp->aux = NULL;
 748                 goto error;
 749         }
 750
 751         dp->link = dp_link_get(dev, dp->aux);
 752         if (IS_ERR(dp->link)) {
 753                 rc = PTR_ERR(dp->link);
 754                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 755                 dp->link = NULL;
 756                 goto error_link;
 757         }
 758
 759         panel_in.aux = dp->aux;
 760         panel_in.catalog = dp->catalog;
 761         panel_in.link = dp->link;
 762
 763         dp->panel = dp_panel_get(&panel_in);
 764         if (IS_ERR(dp->panel)) {
 765                 rc = PTR_ERR(dp->panel);
 766                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 767                 dp->panel = NULL;
 768                 goto error_link;
 769         }
 770
 771         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 772                                dp->power, dp->catalog, dp->parser);
 773         if (IS_ERR(dp->ctrl)) {
 774                 rc = PTR_ERR(dp->ctrl);
 775                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 776                 dp->ctrl = NULL;
 777                 goto error_ctrl;
 778         }
 779
 780         dp->audio = dp_audio_get(dp->dp_display.pdev, dp->panel, dp->catalog);
 781         if (IS_ERR(dp->audio)) {
 782                 rc = PTR_ERR(dp->audio);
 783                 pr_err("failed to initialize audio, rc = %d\n", rc);
 784                 dp->audio = NULL;
 785                 goto error_ctrl;
 786         }
 787
 788         /* populate wide_bus_en to differernt layers */
 789         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 790         dp->catalog->wide_bus_en = dp->wide_bus_en;
 791
 792         return rc;
 793
 794 error_ctrl:
 795         dp_panel_put(dp->panel);
 796 error_link:
 797         dp_aux_put(dp->aux);
 798 error:
 799         return rc;
 800 }
 801
 802 static int dp_display_set_mode(struct msm_dp *dp_display,
 803                                struct dp_display_mode *mode)
 804 {
 805         struct dp_display_private *dp;
 806
 807         dp = container_of(dp_display, struct dp_display_private, dp_display);
 808
 809         drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
 810         dp->panel->dp_mode.bpp = mode->bpp;
 811         dp->panel->dp_mode.capabilities = mode->capabilities;
 812         dp_panel_init_panel_info(dp->panel);
 813         return 0;
 814 }
 815
 816 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
 817 {
 818         int rc = 0;
 819         struct msm_dp *dp_display = &dp->dp_display;
 820
 821         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 822         if (dp_display->power_on) {
 823                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 824                 return 0;
 825         }
 826
 827         rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
 828         if (!rc)
 829                 dp_display->power_on = true;
 830
 831         return rc;
 832 }
 833
 834 static int dp_display_post_enable(struct msm_dp *dp_display)
 835 {
 836         struct dp_display_private *dp;
 837         u32 rate;
 838
 839         dp = container_of(dp_display, struct dp_display_private, dp_display);
 840
 841         rate = dp->link->link_params.rate;
 842
 843         if (dp->audio_supported) {
 844                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 845                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 846         }
 847
 848         /* signal the connect event late to synchronize video and display */
 849         dp_display_handle_plugged_change(dp_display, true);
 850
 851         if (dp_display->psr_supported)
 852                 dp_ctrl_config_psr(dp->ctrl);
 853
 854         return 0;
 855 }
 856
 857 static int dp_display_disable(struct dp_display_private *dp)
 858 {
 859         struct msm_dp *dp_display = &dp->dp_display;
 860
 861         if (!dp_display->power_on)
 862                 return 0;
 863
 864         /* wait only if audio was enabled */
 865         if (dp_display->audio_enabled) {
 866                 /* signal the disconnect event */
 867                 dp_display_handle_plugged_change(dp_display, false);
 868                 if (!wait_for_completion_timeout(&dp->audio_comp,
 869                                 HZ * 5))
 870                         DRM_ERROR("audio comp timeout\n");
 871         }
 872
 873         dp_display->audio_enabled = false;
 874
 875         if (dp->link->sink_count == 0) {
 876                 /*
 877                  * irq_hpd with sink_count = 0
 878                  * hdmi unplugged out of dongle
 879                  */
 880                 dp_ctrl_off_link_stream(dp->ctrl);
 881         } else {
 882                 /*
 883                  * unplugged interrupt
 884                  * dongle unplugged out of DUT
 885                  */
 886                 dp_ctrl_off(dp->ctrl);
 887                 dp_display_host_phy_exit(dp);
 888         }
 889
 890         dp_display->power_on = false;
 891
 892         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 893         return 0;
 894 }
 895
 896 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 897                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 898 {
 899         bool plugged;
 900
 901         dp_display->plugged_cb = fn;
 902         dp_display->codec_dev = codec_dev;
 903         plugged = dp_display->link_ready;
 904         dp_display_handle_plugged_change(dp_display, plugged);
 905
 906         return 0;
 907 }
 908
 909 /**
 910  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 911  * @bridge: Pointer to drm bridge structure
 912  * @info: display info
 913  * @mode: Pointer to drm mode structure
 914  * Returns: Validity status for specified mode
 915  */
 916 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 917                                           const struct drm_display_info *info,
 918                                           const struct drm_display_mode *mode)
 919 {
 920         const u32 num_components = 3, default_bpp = 24;
 921         struct dp_display_private *dp_display;
 922         struct dp_link_info *link_info;
 923         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 924         struct msm_dp *dp;
 925         int mode_pclk_khz = mode->clock;
 926
 927         dp = to_dp_bridge(bridge)->dp_display;
 928
 929         if (!dp || !mode_pclk_khz || !dp->connector) {
 930                 DRM_ERROR("invalid params\n");
 931                 return -EINVAL;
 932         }
 933
 934         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 935                 return MODE_CLOCK_HIGH;
 936
 937         dp_display = container_of(dp, struct dp_display_private, dp_display);
 938         link_info = &dp_display->panel->link_info;
 939
 940         mode_bpp = dp->connector->display_info.bpc * num_components;
 941         if (!mode_bpp)
 942                 mode_bpp = default_bpp;
 943
 944         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
 945                         mode_bpp, mode_pclk_khz);
 946
 947         mode_rate_khz = mode_pclk_khz * mode_bpp;
 948         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
 949
 950         if (mode_rate_khz > supported_rate_khz)
 951                 return MODE_BAD;
 952
 953         return MODE_OK;
 954 }
 955
 956 int dp_display_get_modes(struct msm_dp *dp)
 957 {
 958         struct dp_display_private *dp_display;
 959
 960         if (!dp) {
 961                 DRM_ERROR("invalid params\n");
 962                 return 0;
 963         }
 964
 965         dp_display = container_of(dp, struct dp_display_private, dp_display);
 966
 967         return dp_panel_get_modes(dp_display->panel,
 968                 dp->connector);
 969 }
 970
 971 bool dp_display_check_video_test(struct msm_dp *dp)
 972 {
 973         struct dp_display_private *dp_display;
 974
 975         dp_display = container_of(dp, struct dp_display_private, dp_display);
 976
 977         return dp_display->panel->video_test;
 978 }
 979
 980 int dp_display_get_test_bpp(struct msm_dp *dp)
 981 {
 982         struct dp_display_private *dp_display;
 983
 984         if (!dp) {
 985                 DRM_ERROR("invalid params\n");
 986                 return 0;
 987         }
 988
 989         dp_display = container_of(dp, struct dp_display_private, dp_display);
 990
 991         return dp_link_bit_depth_to_bpp(
 992                 dp_display->link->test_video.test_bit_depth);
 993 }
 994
 995 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
 996 {
 997         struct dp_display_private *dp_display;
 998
 999         dp_display = container_of(dp, struct dp_display_private, dp_display);
1000
1001         /*
1002          * if we are reading registers we need the link clocks to be on
1003          * however till DP cable is connected this will not happen as we
1004          * do not know the resolution to power up with. Hence check the
1005          * power_on status before dumping DP registers to avoid crash due
1006          * to unclocked access
1007          */
1008         mutex_lock(&dp_display->event_mutex);
1009
1010         if (!dp->power_on) {
1011                 mutex_unlock(&dp_display->event_mutex);
1012                 return;
1013         }
1014
1015         dp_catalog_snapshot(dp_display->catalog, disp_state);
1016
1017         mutex_unlock(&dp_display->event_mutex);
1018 }
1019
1020 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1021 {
1022         struct dp_display_private *dp;
1023
1024         if (!dp_display) {
1025                 DRM_ERROR("invalid params\n");
1026                 return;
1027         }
1028
1029         dp = container_of(dp_display, struct dp_display_private, dp_display);
1030         dp_ctrl_set_psr(dp->ctrl, enter);
1031 }
1032
1033 static int hpd_event_thread(void *data)
1034 {
1035         struct dp_display_private *dp_priv;
1036         unsigned long flag;
1037         struct dp_event *todo;
1038         int timeout_mode = 0;
1039
1040         dp_priv = (struct dp_display_private *)data;
1041
1042         while (1) {
1043                 if (timeout_mode) {
1044                         wait_event_timeout(dp_priv->event_q,
1045                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1046                                         kthread_should_stop(), EVENT_TIMEOUT);
1047                 } else {
1048                         wait_event_interruptible(dp_priv->event_q,
1049                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1050                                         kthread_should_stop());
1051                 }
1052
1053                 if (kthread_should_stop())
1054                         break;
1055
1056                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1057                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1058                 if (todo->delay) {
1059                         struct dp_event *todo_next;
1060
1061                         dp_priv->event_gndx++;
1062                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1063
1064                         /* re enter delay event into q */
1065                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1066                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1067                         todo_next->event_id = todo->event_id;
1068                         todo_next->data = todo->data;
1069                         todo_next->delay = todo->delay - 1;
1070
1071                         /* clean up older event */
1072                         todo->event_id = EV_NO_EVENT;
1073                         todo->delay = 0;
1074
1075                         /* switch to timeout mode */
1076                         timeout_mode = 1;
1077                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1078                         continue;
1079                 }
1080
1081                 /* timeout with no events in q */
1082                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1083                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1084                         continue;
1085                 }
1086
1087                 dp_priv->event_gndx++;
1088                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1089                 timeout_mode = 0;
1090                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1091
1092                 switch (todo->event_id) {
1093                 case EV_HPD_PLUG_INT:
1094                         dp_hpd_plug_handle(dp_priv, todo->data);
1095                         break;
1096                 case EV_HPD_UNPLUG_INT:
1097                         dp_hpd_unplug_handle(dp_priv, todo->data);
1098                         break;
1099                 case EV_IRQ_HPD_INT:
1100                         dp_irq_hpd_handle(dp_priv, todo->data);
1101                         break;
1102                 case EV_USER_NOTIFICATION:
1103                         dp_display_send_hpd_notification(dp_priv,
1104                                                 todo->data);
1105                         break;
1106                 default:
1107                         break;
1108                 }
1109         }
1110
1111         return 0;
1112 }
1113
1114 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1115 {
1116         /* set event q to empty */
1117         dp_priv->event_gndx = 0;
1118         dp_priv->event_pndx = 0;
1119
1120         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1121         if (IS_ERR(dp_priv->ev_tsk))
1122                 return PTR_ERR(dp_priv->ev_tsk);
1123
1124         return 0;
1125 }
1126
1127 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1128 {
1129         struct dp_display_private *dp = dev_id;
1130         irqreturn_t ret = IRQ_NONE;
1131         u32 hpd_isr_status;
1132
1133         if (!dp) {
1134                 DRM_ERROR("invalid data\n");
1135                 return IRQ_NONE;
1136         }
1137
1138         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1139
1140         if (hpd_isr_status & 0x0F) {
1141                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1142                         dp->dp_display.connector_type, hpd_isr_status);
1143                 /* hpd related interrupts */
1144                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1145                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1146
1147                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1148                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1149                 }
1150
1151                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1152                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1153                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1154                 }
1155
1156                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1157                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1158
1159                 ret = IRQ_HANDLED;
1160         }
1161
1162         /* DP controller isr */
1163         ret |= dp_ctrl_isr(dp->ctrl);
1164
1165         /* DP aux isr */
1166         ret |= dp_aux_isr(dp->aux);
1167
1168         return ret;
1169 }
1170
1171 static int dp_display_request_irq(struct dp_display_private *dp)
1172 {
1173         int rc = 0;
1174         struct platform_device *pdev = dp->dp_display.pdev;
1175
1176         dp->irq = platform_get_irq(pdev, 0);
1177         if (dp->irq < 0) {
1178                 DRM_ERROR("failed to get irq\n");
1179                 return dp->irq;
1180         }
1181
1182         rc = devm_request_irq(&pdev->dev, dp->irq, dp_display_irq_handler,
1183                               IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
1184                               "dp_display_isr", dp);
1185
1186         if (rc < 0) {
1187                 DRM_ERROR("failed to request IRQ%u: %d\n",
1188                                 dp->irq, rc);
1189                 return rc;
1190         }
1191
1192         return 0;
1193 }
1194
1195 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1196 {
1197         const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1198         struct resource *res;
1199         int i;
1200
1201         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1202         if (!res)
1203                 return NULL;
1204
1205         for (i = 0; i < descs[i].io_start; i++) {
1206                 if (descs[i].io_start == res->start)
1207                         return &descs[i];
1208         }
1209
1210         dev_err(&pdev->dev, "unknown displayport instance\n");
1211         return NULL;
1212 }
1213
1214 static int dp_display_get_next_bridge(struct msm_dp *dp);
1215
1216 static int dp_display_probe_tail(struct device *dev)
1217 {
1218         struct msm_dp *dp = dev_get_drvdata(dev);
1219         int ret;
1220
1221         ret = dp_display_get_next_bridge(dp);
1222         if (ret)
1223                 return ret;
1224
1225         ret = component_add(dev, &dp_display_comp_ops);
1226         if (ret)
1227                 DRM_ERROR("component add failed, rc=%d\n", ret);
1228
1229         return ret;
1230 }
1231
1232 static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
1233 {
1234         return dp_display_probe_tail(aux->dev);
1235 }
1236
1237 static int dp_display_probe(struct platform_device *pdev)
1238 {
1239         int rc = 0;
1240         struct dp_display_private *dp;
1241         const struct msm_dp_desc *desc;
1242
1243         if (!pdev || !pdev->dev.of_node) {
1244                 DRM_ERROR("pdev not found\n");
1245                 return -ENODEV;
1246         }
1247
1248         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1249         if (!dp)
1250                 return -ENOMEM;
1251
1252         desc = dp_display_get_desc(pdev);
1253         if (!desc)
1254                 return -EINVAL;
1255
1256         dp->dp_display.pdev = pdev;
1257         dp->name = "drm_dp";
1258         dp->id = desc->id;
1259         dp->dp_display.connector_type = desc->connector_type;
1260         dp->wide_bus_en = desc->wide_bus_en;
1261         dp->dp_display.is_edp =
1262                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1263
1264         rc = dp_init_sub_modules(dp);
1265         if (rc) {
1266                 DRM_ERROR("init sub module failed\n");
1267                 return -EPROBE_DEFER;
1268         }
1269
1270         rc = dp->parser->parse(dp->parser);
1271         if (rc) {
1272                 DRM_ERROR("device tree parsing failed\n");
1273                 goto err;
1274         }
1275
1276         rc = dp_power_client_init(dp->power);
1277         if (rc) {
1278                 DRM_ERROR("Power client create failed\n");
1279                 goto err;
1280         }
1281
1282         /* setup event q */
1283         mutex_init(&dp->event_mutex);
1284         init_waitqueue_head(&dp->event_q);
1285         spin_lock_init(&dp->event_lock);
1286
1287         /* Store DP audio handle inside DP display */
1288         dp->dp_display.dp_audio = dp->audio;
1289
1290         init_completion(&dp->audio_comp);
1291
1292         platform_set_drvdata(pdev, &dp->dp_display);
1293
1294         rc = devm_pm_runtime_enable(&pdev->dev);
1295         if (rc)
1296                 goto err;
1297
1298         rc = dp_display_request_irq(dp);
1299         if (rc)
1300                 goto err;
1301
1302         if (dp->dp_display.is_edp) {
1303                 rc = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe);
1304                 if (rc) {
1305                         DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc);
1306                         goto err;
1307                 }
1308         } else {
1309                 rc = dp_display_probe_tail(&pdev->dev);
1310                 if (rc)
1311                         goto err;
1312         }
1313
1314         return rc;
1315
1316 err:
1317         dp_display_deinit_sub_modules(dp);
1318         return rc;
1319 }
1320
1321 static void dp_display_remove(struct platform_device *pdev)
1322 {
1323         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1324
1325         component_del(&pdev->dev, &dp_display_comp_ops);
1326         dp_display_deinit_sub_modules(dp);
1327         platform_set_drvdata(pdev, NULL);
1328 }
1329
1330 static int dp_pm_runtime_suspend(struct device *dev)
1331 {
1332         struct dp_display_private *dp = dev_get_dp_display_private(dev);
1333
1334         disable_irq(dp->irq);
1335
1336         if (dp->dp_display.is_edp) {
1337                 dp_display_host_phy_exit(dp);
1338                 dp_catalog_ctrl_hpd_disable(dp->catalog);
1339         }
1340         dp_display_host_deinit(dp);
1341
1342         return 0;
1343 }
1344
1345 static int dp_pm_runtime_resume(struct device *dev)
1346 {
1347         struct dp_display_private *dp = dev_get_dp_display_private(dev);
1348
1349         /*
1350          * for eDP, host cotroller, HPD block and PHY are enabled here
1351          * but with HPD irq disabled
1352          *
1353          * for DP, only host controller is enabled here.
1354          * HPD block is enabled at dp_bridge_hpd_enable()
1355          * PHY will be enabled at plugin handler later
1356          */
1357         dp_display_host_init(dp);
1358         if (dp->dp_display.is_edp) {
1359                 dp_catalog_ctrl_hpd_enable(dp->catalog);
1360                 dp_display_host_phy_init(dp);
1361         }
1362
1363         enable_irq(dp->irq);
1364         return 0;
1365 }
1366
1367 static const struct dev_pm_ops dp_pm_ops = {
1368         SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
1369         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1370                                 pm_runtime_force_resume)
1371 };
1372
1373 static struct platform_driver dp_display_driver = {
1374         .probe  = dp_display_probe,
1375         .remove_new = dp_display_remove,
1376         .driver = {
1377                 .name = "msm-dp-display",
1378                 .of_match_table = dp_dt_match,
1379                 .suppress_bind_attrs = true,
1380                 .pm = &dp_pm_ops,
1381         },
1382 };
1383
1384 int __init msm_dp_register(void)
1385 {
1386         int ret;
1387
1388         ret = platform_driver_register(&dp_display_driver);
1389         if (ret)
1390                 DRM_ERROR("Dp display driver register failed");
1391
1392         return ret;
1393 }
1394
1395 void __exit msm_dp_unregister(void)
1396 {
1397         platform_driver_unregister(&dp_display_driver);
1398 }
1399
1400 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1401 {
1402         struct dp_display_private *dp;
1403
1404         dp = container_of(dp_display, struct dp_display_private, dp_display);
1405
1406         return dp->wide_bus_en;
1407 }
1408
1409 void dp_display_debugfs_init(struct msm_dp *dp_display, struct dentry *root, bool is_edp)
1410 {
1411         struct dp_display_private *dp;
1412         struct device *dev;
1413         int rc;
1414
1415         dp = container_of(dp_display, struct dp_display_private, dp_display);
1416         dev = &dp->dp_display.pdev->dev;
1417
1418         dp->debug = dp_debug_get(dev, dp->panel,
1419                                         dp->link, dp->dp_display.connector,
1420                                         root, is_edp);
1421         if (IS_ERR(dp->debug)) {
1422                 rc = PTR_ERR(dp->debug);
1423                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1424                 dp->debug = NULL;
1425         }
1426 }
1427
1428 static int dp_display_get_next_bridge(struct msm_dp *dp)
1429 {
1430         int rc;
1431         struct dp_display_private *dp_priv;
1432
1433         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1434
1435         /*
1436          * External bridges are mandatory for eDP interfaces: one has to
1437          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1438          *
1439          * For DisplayPort interfaces external bridges are optional, so
1440          * silently ignore an error if one is not present (-ENODEV).
1441          */
1442         rc = devm_dp_parser_find_next_bridge(&dp->pdev->dev, dp_priv->parser);
1443         if (!dp->is_edp && rc == -ENODEV)
1444                 return 0;
1445
1446         if (!rc)
1447                 dp->next_bridge = dp_priv->parser->next_bridge;
1448
1449         return rc;
1450 }
1451
1452 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1453                         struct drm_encoder *encoder)
1454 {
1455         struct dp_display_private *dp_priv;
1456         int ret;
1457
1458         dp_display->drm_dev = dev;
1459
1460         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1461
1462         ret = dp_bridge_init(dp_display, dev, encoder);
1463         if (ret) {
1464                 DRM_DEV_ERROR(dev->dev,
1465                         "failed to create dp bridge: %d\n", ret);
1466                 return ret;
1467         }
1468
1469         dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1470         if (IS_ERR(dp_display->connector)) {
1471                 ret = PTR_ERR(dp_display->connector);
1472                 DRM_DEV_ERROR(dev->dev,
1473                         "failed to create dp connector: %d\n", ret);
1474                 dp_display->connector = NULL;
1475                 return ret;
1476         }
1477
1478         dp_priv->panel->connector = dp_display->connector;
1479
1480         return 0;
1481 }
1482
1483 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1484                              struct drm_bridge_state *old_bridge_state)
1485 {
1486         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1487         struct msm_dp *dp = dp_bridge->dp_display;
1488         int rc = 0;
1489         struct dp_display_private *dp_display;
1490         u32 state;
1491         bool force_link_train = false;
1492
1493         dp_display = container_of(dp, struct dp_display_private, dp_display);
1494         if (!dp_display->dp_mode.drm_mode.clock) {
1495                 DRM_ERROR("invalid params\n");
1496                 return;
1497         }
1498
1499         if (dp->is_edp)
1500                 dp_hpd_plug_handle(dp_display, 0);
1501
1502         mutex_lock(&dp_display->event_mutex);
1503         if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
1504                 DRM_ERROR("failed to pm_runtime_resume\n");
1505                 mutex_unlock(&dp_display->event_mutex);
1506                 return;
1507         }
1508
1509         state = dp_display->hpd_state;
1510         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1511                 mutex_unlock(&dp_display->event_mutex);
1512                 return;
1513         }
1514
1515         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1516         if (rc) {
1517                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1518                 mutex_unlock(&dp_display->event_mutex);
1519                 return;
1520         }
1521
1522         state =  dp_display->hpd_state;
1523
1524         if (state == ST_DISPLAY_OFF) {
1525                 dp_display_host_phy_init(dp_display);
1526                 force_link_train = true;
1527         }
1528
1529         dp_display_enable(dp_display, force_link_train);
1530
1531         rc = dp_display_post_enable(dp);
1532         if (rc) {
1533                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1534                 dp_display_disable(dp_display);
1535         }
1536
1537         /* completed connection */
1538         dp_display->hpd_state = ST_CONNECTED;
1539
1540         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1541         mutex_unlock(&dp_display->event_mutex);
1542 }
1543
1544 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1545                               struct drm_bridge_state *old_bridge_state)
1546 {
1547         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1548         struct msm_dp *dp = dp_bridge->dp_display;
1549         struct dp_display_private *dp_display;
1550
1551         dp_display = container_of(dp, struct dp_display_private, dp_display);
1552
1553         dp_ctrl_push_idle(dp_display->ctrl);
1554 }
1555
1556 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1557                                    struct drm_bridge_state *old_bridge_state)
1558 {
1559         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1560         struct msm_dp *dp = dp_bridge->dp_display;
1561         u32 state;
1562         struct dp_display_private *dp_display;
1563
1564         dp_display = container_of(dp, struct dp_display_private, dp_display);
1565
1566         if (dp->is_edp)
1567                 dp_hpd_unplug_handle(dp_display, 0);
1568
1569         mutex_lock(&dp_display->event_mutex);
1570
1571         state = dp_display->hpd_state;
1572         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
1573                 drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
1574                            dp->connector_type, state);
1575
1576         dp_display_disable(dp_display);
1577
1578         state =  dp_display->hpd_state;
1579         if (state == ST_DISCONNECT_PENDING) {
1580                 /* completed disconnection */
1581                 dp_display->hpd_state = ST_DISCONNECTED;
1582         } else {
1583                 dp_display->hpd_state = ST_DISPLAY_OFF;
1584         }
1585
1586         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1587
1588         pm_runtime_put_sync(&dp->pdev->dev);
1589         mutex_unlock(&dp_display->event_mutex);
1590 }
1591
1592 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1593                         const struct drm_display_mode *mode,
1594                         const struct drm_display_mode *adjusted_mode)
1595 {
1596         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1597         struct msm_dp *dp = dp_bridge->dp_display;
1598         struct dp_display_private *dp_display;
1599
1600         dp_display = container_of(dp, struct dp_display_private, dp_display);
1601
1602         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1603
1604         if (dp_display_check_video_test(dp))
1605                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1606         else /* Default num_components per pixel = 3 */
1607                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1608
1609         if (!dp_display->dp_mode.bpp)
1610                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1611
1612         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1613
1614         dp_display->dp_mode.v_active_low =
1615                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1616
1617         dp_display->dp_mode.h_active_low =
1618                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1619 }
1620
1621 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1622 {
1623         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1624         struct msm_dp *dp_display = dp_bridge->dp_display;
1625         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1626
1627         /*
1628          * this is for external DP with hpd irq enabled case,
1629          * step-1: dp_pm_runtime_resume() enable dp host only
1630          * step-2: enable hdp block and have hpd irq enabled here
1631          * step-3: waiting for plugin irq while phy is not initialized
1632          * step-4: DP PHY is initialized at plugin handler before link training
1633          *
1634          */
1635         mutex_lock(&dp->event_mutex);
1636         if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
1637                 DRM_ERROR("failed to resume power\n");
1638                 mutex_unlock(&dp->event_mutex);
1639                 return;
1640         }
1641
1642         dp_catalog_ctrl_hpd_enable(dp->catalog);
1643
1644         /* enable HDP interrupts */
1645         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1646
1647         dp_display->internal_hpd = true;
1648         mutex_unlock(&dp->event_mutex);
1649 }
1650
1651 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1652 {
1653         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1654         struct msm_dp *dp_display = dp_bridge->dp_display;
1655         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1656
1657         mutex_lock(&dp->event_mutex);
1658         /* disable HDP interrupts */
1659         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1660         dp_catalog_ctrl_hpd_disable(dp->catalog);
1661
1662         dp_display->internal_hpd = false;
1663
1664         pm_runtime_put_sync(&dp_display->pdev->dev);
1665         mutex_unlock(&dp->event_mutex);
1666 }
1667
1668 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1669                           enum drm_connector_status status)
1670 {
1671         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1672         struct msm_dp *dp_display = dp_bridge->dp_display;
1673         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1674
1675         /* Without next_bridge interrupts are handled by the DP core directly */
1676         if (dp_display->internal_hpd)
1677                 return;
1678
1679         if (!dp_display->link_ready && status == connector_status_connected)
1680                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1681         else if (dp_display->link_ready && status == connector_status_disconnected)
1682                 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1683 }