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 };
  53
  54 enum {
  55         EV_NO_EVENT,
  56         /* hpd events */
  57         EV_HPD_PLUG_INT,
  58         EV_IRQ_HPD_INT,
  59         EV_HPD_UNPLUG_INT,
  60         EV_USER_NOTIFICATION,
  61 };
  62
  63 #define EVENT_TIMEOUT   (HZ/10) /* 100ms */
  64 #define DP_EVENT_Q_MAX  8
  65
  66 #define DP_TIMEOUT_NONE         0
  67
  68 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  69
  70 struct dp_event {
  71         u32 event_id;
  72         u32 data;
  73         u32 delay;
  74 };
  75
  76 struct dp_display_private {
  77         char *name;
  78         int irq;
  79
  80         unsigned int id;
  81
  82         /* state variables */
  83         bool core_initialized;
  84         bool phy_initialized;
  85         bool hpd_irq_on;
  86         bool audio_supported;
  87
  88         struct drm_device *drm_dev;
  89         struct dentry *root;
  90
  91         struct dp_parser  *parser;
  92         struct dp_power   *power;
  93         struct dp_catalog *catalog;
  94         struct drm_dp_aux *aux;
  95         struct dp_link    *link;
  96         struct dp_panel   *panel;
  97         struct dp_ctrl    *ctrl;
  98         struct dp_debug   *debug;
  99
 100         struct dp_display_mode dp_mode;
 101         struct msm_dp dp_display;
 102
 103         /* wait for audio signaling */
 104         struct completion audio_comp;
 105
 106         /* event related only access by event thread */
 107         struct mutex event_mutex;
 108         wait_queue_head_t event_q;
 109         u32 hpd_state;
 110         u32 event_pndx;
 111         u32 event_gndx;
 112         struct task_struct *ev_tsk;
 113         struct dp_event event_list[DP_EVENT_Q_MAX];
 114         spinlock_t event_lock;
 115
 116         bool wide_bus_en;
 117
 118         struct dp_audio *audio;
 119 };
 120
 121 struct msm_dp_desc {
 122         phys_addr_t io_start;
 123         unsigned int id;
 124         unsigned int connector_type;
 125         bool wide_bus_en;
 126 };
 127
 128 static const struct msm_dp_desc sc7180_dp_descs[] = {
 129         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 130         {}
 131 };
 132
 133 static const struct msm_dp_desc sc7280_dp_descs[] = {
 134         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 135         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 136         {}
 137 };
 138
 139 static const struct msm_dp_desc sc8180x_dp_descs[] = {
 140         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 141         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 142         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
 143         {}
 144 };
 145
 146 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
 147         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 148         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 149         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 150         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 151         { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 152         { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 153         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 154         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 155         {}
 156 };
 157
 158 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
 159         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 160         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 161         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 162         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 163         {}
 164 };
 165
 166 static const struct msm_dp_desc sm8350_dp_descs[] = {
 167         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 168         {}
 169 };
 170
 171 static const struct msm_dp_desc sm8650_dp_descs[] = {
 172         { .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 173         {}
 174 };
 175
 176 static const struct of_device_id dp_dt_match[] = {
 177         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
 178         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
 179         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
 180         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
 181         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
 182         { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
 183         { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
 184         { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
 185         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
 186         { .compatible = "qcom,sm8650-dp", .data = &sm8650_dp_descs },
 187         {}
 188 };
 189
 190 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 191 {
 192         struct msm_dp *dp = dev_get_drvdata(dev);
 193
 194         return container_of(dp, struct dp_display_private, dp_display);
 195 }
 196
 197 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 198                                                 u32 data, u32 delay)
 199 {
 200         unsigned long flag;
 201         struct dp_event *todo;
 202         int pndx;
 203
 204         spin_lock_irqsave(&dp_priv->event_lock, flag);
 205         pndx = dp_priv->event_pndx + 1;
 206         pndx %= DP_EVENT_Q_MAX;
 207         if (pndx == dp_priv->event_gndx) {
 208                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 209                         dp_priv->event_pndx, dp_priv->event_gndx);
 210                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 211                 return -EPERM;
 212         }
 213         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 214         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 215         todo->event_id = event;
 216         todo->data = data;
 217         todo->delay = delay;
 218         wake_up(&dp_priv->event_q);
 219         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 220
 221         return 0;
 222 }
 223
 224 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 225 {
 226         unsigned long flag;
 227         struct dp_event *todo;
 228         u32     gndx;
 229
 230         spin_lock_irqsave(&dp_priv->event_lock, flag);
 231         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 232                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 233                 return -ENOENT;
 234         }
 235
 236         gndx = dp_priv->event_gndx;
 237         while (dp_priv->event_pndx != gndx) {
 238                 todo = &dp_priv->event_list[gndx];
 239                 if (todo->event_id == event) {
 240                         todo->event_id = EV_NO_EVENT;   /* deleted */
 241                         todo->delay = 0;
 242                 }
 243                 gndx++;
 244                 gndx %= DP_EVENT_Q_MAX;
 245         }
 246         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 247
 248         return 0;
 249 }
 250
 251 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 252 {
 253         struct dp_display_private *dp;
 254
 255         dp = container_of(dp_display, struct dp_display_private, dp_display);
 256
 257         reinit_completion(&dp->audio_comp);
 258 }
 259
 260 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 261 {
 262         struct dp_display_private *dp;
 263
 264         dp = container_of(dp_display, struct dp_display_private, dp_display);
 265
 266         complete_all(&dp->audio_comp);
 267 }
 268
 269 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 270
 271 static int dp_display_bind(struct device *dev, struct device *master,
 272                            void *data)
 273 {
 274         int rc = 0;
 275         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 276         struct msm_drm_private *priv = dev_get_drvdata(master);
 277         struct drm_device *drm = priv->dev;
 278
 279         dp->dp_display.drm_dev = drm;
 280         priv->dp[dp->id] = &dp->dp_display;
 281
 282
 283
 284         dp->drm_dev = drm;
 285         dp->aux->drm_dev = drm;
 286         rc = dp_aux_register(dp->aux);
 287         if (rc) {
 288                 DRM_ERROR("DRM DP AUX register failed\n");
 289                 goto end;
 290         }
 291
 292
 293         rc = dp_register_audio_driver(dev, dp->audio);
 294         if (rc) {
 295                 DRM_ERROR("Audio registration Dp failed\n");
 296                 goto end;
 297         }
 298
 299         rc = dp_hpd_event_thread_start(dp);
 300         if (rc) {
 301                 DRM_ERROR("Event thread create failed\n");
 302                 goto end;
 303         }
 304
 305         return 0;
 306 end:
 307         return rc;
 308 }
 309
 310 static void dp_display_unbind(struct device *dev, struct device *master,
 311                               void *data)
 312 {
 313         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 314         struct msm_drm_private *priv = dev_get_drvdata(master);
 315
 316         kthread_stop(dp->ev_tsk);
 317
 318         of_dp_aux_depopulate_bus(dp->aux);
 319
 320         dp_unregister_audio_driver(dev, dp->audio);
 321         dp_aux_unregister(dp->aux);
 322         dp->drm_dev = NULL;
 323         dp->aux->drm_dev = NULL;
 324         priv->dp[dp->id] = NULL;
 325 }
 326
 327 static const struct component_ops dp_display_comp_ops = {
 328         .bind = dp_display_bind,
 329         .unbind = dp_display_unbind,
 330 };
 331
 332 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 333 {
 334         struct dp_display_private *dp;
 335         struct drm_connector *connector;
 336
 337         dp = container_of(dp_display, struct dp_display_private, dp_display);
 338
 339         connector = dp->dp_display.connector;
 340         drm_helper_hpd_irq_event(connector->dev);
 341 }
 342
 343 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 344                                             bool hpd)
 345 {
 346         if ((hpd && dp->dp_display.link_ready) ||
 347                         (!hpd && !dp->dp_display.link_ready)) {
 348                 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 349                                 (hpd ? "on" : "off"));
 350                 return 0;
 351         }
 352
 353         /* reset video pattern flag on disconnect */
 354         if (!hpd) {
 355                 dp->panel->video_test = false;
 356                 if (!dp->dp_display.is_edp)
 357                         drm_dp_set_subconnector_property(dp->dp_display.connector,
 358                                                          connector_status_disconnected,
 359                                                          dp->panel->dpcd,
 360                                                          dp->panel->downstream_ports);
 361         }
 362
 363         dp->dp_display.link_ready = hpd;
 364
 365         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 366                         dp->dp_display.connector_type, hpd);
 367         dp_display_send_hpd_event(&dp->dp_display);
 368
 369         return 0;
 370 }
 371
 372 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 373 {
 374         int rc = 0;
 375         struct edid *edid;
 376
 377         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 378         dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
 379
 380         drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
 381                 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
 382
 383         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 384         if (rc)
 385                 goto end;
 386
 387         dp_link_process_request(dp->link);
 388
 389         if (!dp->dp_display.is_edp)
 390                 drm_dp_set_subconnector_property(dp->dp_display.connector,
 391                                                  connector_status_connected,
 392                                                  dp->panel->dpcd,
 393                                                  dp->panel->downstream_ports);
 394
 395         edid = dp->panel->edid;
 396
 397         dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
 398
 399         dp->audio_supported = drm_detect_monitor_audio(edid);
 400         dp_panel_handle_sink_request(dp->panel);
 401
 402         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 403
 404         /*
 405          * set sink to normal operation mode -- D0
 406          * before dpcd read
 407          */
 408         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 409
 410         dp_link_reset_phy_params_vx_px(dp->link);
 411         rc = dp_ctrl_on_link(dp->ctrl);
 412         if (rc) {
 413                 DRM_ERROR("failed to complete DP link training\n");
 414                 goto end;
 415         }
 416
 417         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 418
 419 end:
 420         return rc;
 421 }
 422
 423 static void dp_display_host_phy_init(struct dp_display_private *dp)
 424 {
 425         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 426                 dp->dp_display.connector_type, dp->core_initialized,
 427                 dp->phy_initialized);
 428
 429         if (!dp->phy_initialized) {
 430                 dp_ctrl_phy_init(dp->ctrl);
 431                 dp->phy_initialized = true;
 432         }
 433 }
 434
 435 static void dp_display_host_phy_exit(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_exit(dp->ctrl);
 443                 dp->phy_initialized = false;
 444         }
 445 }
 446
 447 static void dp_display_host_init(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         dp_power_init(dp->power);
 454         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 455         dp_aux_init(dp->aux);
 456         dp->core_initialized = true;
 457 }
 458
 459 static void dp_display_host_deinit(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_ctrl_reset_irq_ctrl(dp->ctrl, false);
 466         dp_aux_deinit(dp->aux);
 467         dp_power_deinit(dp->power);
 468         dp->core_initialized = false;
 469 }
 470
 471 static int dp_display_usbpd_configure_cb(struct device *dev)
 472 {
 473         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 474
 475         dp_display_host_phy_init(dp);
 476
 477         return dp_display_process_hpd_high(dp);
 478 }
 479
 480 static int dp_display_notify_disconnect(struct device *dev)
 481 {
 482         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 483
 484         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 485
 486         return 0;
 487 }
 488
 489 static void dp_display_handle_video_request(struct dp_display_private *dp)
 490 {
 491         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 492                 dp->panel->video_test = true;
 493                 dp_link_send_test_response(dp->link);
 494         }
 495 }
 496
 497 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 498 {
 499         int rc = 0;
 500
 501         if (drm_dp_is_branch(dp->panel->dpcd) && dp->link->sink_count == 0) {
 502                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 503                 if (dp->hpd_state != ST_DISCONNECTED) {
 504                         dp->hpd_state = ST_DISCONNECT_PENDING;
 505                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 506                 }
 507         } else {
 508                 if (dp->hpd_state == ST_DISCONNECTED) {
 509                         dp->hpd_state = ST_MAINLINK_READY;
 510                         rc = dp_display_process_hpd_high(dp);
 511                         if (rc)
 512                                 dp->hpd_state = ST_DISCONNECTED;
 513                 }
 514         }
 515
 516         return rc;
 517 }
 518
 519 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 520 {
 521         u32 sink_request = dp->link->sink_request;
 522
 523         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 524         if (dp->hpd_state == ST_DISCONNECTED) {
 525                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 526                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 527                                                         sink_request);
 528                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 529                         return -EINVAL;
 530                 }
 531         }
 532
 533         dp_ctrl_handle_sink_request(dp->ctrl);
 534
 535         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 536                 dp_display_handle_video_request(dp);
 537
 538         return 0;
 539 }
 540
 541 static int dp_display_usbpd_attention_cb(struct device *dev)
 542 {
 543         int rc = 0;
 544         u32 sink_request;
 545         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 546
 547         /* check for any test request issued by sink */
 548         rc = dp_link_process_request(dp->link);
 549         if (!rc) {
 550                 sink_request = dp->link->sink_request;
 551                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 552                                         dp->hpd_state, sink_request);
 553                 if (sink_request & DS_PORT_STATUS_CHANGED)
 554                         rc = dp_display_handle_port_ststus_changed(dp);
 555                 else
 556                         rc = dp_display_handle_irq_hpd(dp);
 557         }
 558
 559         return rc;
 560 }
 561
 562 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 563 {
 564         u32 state;
 565         int ret;
 566         struct platform_device *pdev = dp->dp_display.pdev;
 567
 568         mutex_lock(&dp->event_mutex);
 569
 570         state =  dp->hpd_state;
 571         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 572                         dp->dp_display.connector_type, state);
 573
 574         if (state == ST_DISPLAY_OFF) {
 575                 mutex_unlock(&dp->event_mutex);
 576                 return 0;
 577         }
 578
 579         if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
 580                 mutex_unlock(&dp->event_mutex);
 581                 return 0;
 582         }
 583
 584         if (state == ST_DISCONNECT_PENDING) {
 585                 /* wait until ST_DISCONNECTED */
 586                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
 587                 mutex_unlock(&dp->event_mutex);
 588                 return 0;
 589         }
 590
 591         ret = pm_runtime_resume_and_get(&pdev->dev);
 592         if (ret) {
 593                 DRM_ERROR("failed to pm_runtime_resume\n");
 594                 mutex_unlock(&dp->event_mutex);
 595                 return ret;
 596         }
 597
 598         ret = dp_display_usbpd_configure_cb(&pdev->dev);
 599         if (ret) {      /* link train failed */
 600                 dp->hpd_state = ST_DISCONNECTED;
 601         } else {
 602                 dp->hpd_state = ST_MAINLINK_READY;
 603         }
 604
 605         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 606                         dp->dp_display.connector_type, state);
 607         mutex_unlock(&dp->event_mutex);
 608
 609         /* uevent will complete connection part */
 610         return 0;
 611 };
 612
 613 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 614                 bool plugged)
 615 {
 616         struct dp_display_private *dp;
 617
 618         dp = container_of(dp_display,
 619                         struct dp_display_private, dp_display);
 620
 621         /* notify audio subsystem only if sink supports audio */
 622         if (dp_display->plugged_cb && dp_display->codec_dev &&
 623                         dp->audio_supported)
 624                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 625 }
 626
 627 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 628 {
 629         u32 state;
 630         struct platform_device *pdev = dp->dp_display.pdev;
 631
 632         mutex_lock(&dp->event_mutex);
 633
 634         state = dp->hpd_state;
 635
 636         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 637                         dp->dp_display.connector_type, state);
 638
 639         /* unplugged, no more irq_hpd handle */
 640         dp_del_event(dp, EV_IRQ_HPD_INT);
 641
 642         if (state == ST_DISCONNECTED) {
 643                 /* triggered by irq_hdp with sink_count = 0 */
 644                 if (dp->link->sink_count == 0) {
 645                         dp_display_host_phy_exit(dp);
 646                 }
 647                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 648                 mutex_unlock(&dp->event_mutex);
 649                 return 0;
 650         } else if (state == ST_DISCONNECT_PENDING) {
 651                 mutex_unlock(&dp->event_mutex);
 652                 return 0;
 653         } else if (state == ST_MAINLINK_READY) {
 654                 dp_ctrl_off_link(dp->ctrl);
 655                 dp_display_host_phy_exit(dp);
 656                 dp->hpd_state = ST_DISCONNECTED;
 657                 dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 658                 mutex_unlock(&dp->event_mutex);
 659                 return 0;
 660         }
 661
 662         /*
 663          * We don't need separate work for disconnect as
 664          * connect/attention interrupts are disabled
 665          */
 666         dp_display_notify_disconnect(&dp->dp_display.pdev->dev);
 667
 668         if (state == ST_DISPLAY_OFF) {
 669                 dp->hpd_state = ST_DISCONNECTED;
 670         } else {
 671                 dp->hpd_state = ST_DISCONNECT_PENDING;
 672         }
 673
 674         /* signal the disconnect event early to ensure proper teardown */
 675         dp_display_handle_plugged_change(&dp->dp_display, false);
 676
 677         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 678                         dp->dp_display.connector_type, state);
 679
 680         /* uevent will complete disconnection part */
 681         pm_runtime_put_sync(&pdev->dev);
 682         mutex_unlock(&dp->event_mutex);
 683         return 0;
 684 }
 685
 686 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 687 {
 688         u32 state;
 689
 690         mutex_lock(&dp->event_mutex);
 691
 692         /* irq_hpd can happen at either connected or disconnected state */
 693         state =  dp->hpd_state;
 694         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 695                         dp->dp_display.connector_type, state);
 696
 697         if (state == ST_DISPLAY_OFF) {
 698                 mutex_unlock(&dp->event_mutex);
 699                 return 0;
 700         }
 701
 702         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 703                 /* wait until ST_CONNECTED */
 704                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 705                 mutex_unlock(&dp->event_mutex);
 706                 return 0;
 707         }
 708
 709         dp_display_usbpd_attention_cb(&dp->dp_display.pdev->dev);
 710
 711         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 712                         dp->dp_display.connector_type, state);
 713
 714         mutex_unlock(&dp->event_mutex);
 715
 716         return 0;
 717 }
 718
 719 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 720 {
 721         dp_audio_put(dp->audio);
 722         dp_panel_put(dp->panel);
 723         dp_aux_put(dp->aux);
 724 }
 725
 726 static int dp_init_sub_modules(struct dp_display_private *dp)
 727 {
 728         int rc = 0;
 729         struct device *dev = &dp->dp_display.pdev->dev;
 730         struct dp_panel_in panel_in = {
 731                 .dev = dev,
 732         };
 733
 734         dp->parser = dp_parser_get(dp->dp_display.pdev);
 735         if (IS_ERR(dp->parser)) {
 736                 rc = PTR_ERR(dp->parser);
 737                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 738                 dp->parser = NULL;
 739                 goto error;
 740         }
 741
 742         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 743         if (IS_ERR(dp->catalog)) {
 744                 rc = PTR_ERR(dp->catalog);
 745                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 746                 dp->catalog = NULL;
 747                 goto error;
 748         }
 749
 750         dp->power = dp_power_get(dev, dp->parser);
 751         if (IS_ERR(dp->power)) {
 752                 rc = PTR_ERR(dp->power);
 753                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 754                 dp->power = NULL;
 755                 goto error;
 756         }
 757
 758         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 759         if (IS_ERR(dp->aux)) {
 760                 rc = PTR_ERR(dp->aux);
 761                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 762                 dp->aux = NULL;
 763                 goto error;
 764         }
 765
 766         dp->link = dp_link_get(dev, dp->aux);
 767         if (IS_ERR(dp->link)) {
 768                 rc = PTR_ERR(dp->link);
 769                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 770                 dp->link = NULL;
 771                 goto error_link;
 772         }
 773
 774         panel_in.aux = dp->aux;
 775         panel_in.catalog = dp->catalog;
 776         panel_in.link = dp->link;
 777
 778         dp->panel = dp_panel_get(&panel_in);
 779         if (IS_ERR(dp->panel)) {
 780                 rc = PTR_ERR(dp->panel);
 781                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 782                 dp->panel = NULL;
 783                 goto error_link;
 784         }
 785
 786         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 787                                dp->power, dp->catalog, dp->parser);
 788         if (IS_ERR(dp->ctrl)) {
 789                 rc = PTR_ERR(dp->ctrl);
 790                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 791                 dp->ctrl = NULL;
 792                 goto error_ctrl;
 793         }
 794
 795         dp->audio = dp_audio_get(dp->dp_display.pdev, dp->panel, dp->catalog);
 796         if (IS_ERR(dp->audio)) {
 797                 rc = PTR_ERR(dp->audio);
 798                 pr_err("failed to initialize audio, rc = %d\n", rc);
 799                 dp->audio = NULL;
 800                 goto error_ctrl;
 801         }
 802
 803         /* populate wide_bus_en to differernt layers */
 804         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 805         dp->catalog->wide_bus_en = dp->wide_bus_en;
 806
 807         return rc;
 808
 809 error_ctrl:
 810         dp_panel_put(dp->panel);
 811 error_link:
 812         dp_aux_put(dp->aux);
 813 error:
 814         return rc;
 815 }
 816
 817 static int dp_display_set_mode(struct msm_dp *dp_display,
 818                                struct dp_display_mode *mode)
 819 {
 820         struct dp_display_private *dp;
 821
 822         dp = container_of(dp_display, struct dp_display_private, dp_display);
 823
 824         drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
 825         dp->panel->dp_mode.bpp = mode->bpp;
 826         dp->panel->dp_mode.capabilities = mode->capabilities;
 827         dp_panel_init_panel_info(dp->panel);
 828         return 0;
 829 }
 830
 831 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
 832 {
 833         int rc = 0;
 834         struct msm_dp *dp_display = &dp->dp_display;
 835
 836         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 837         if (dp_display->power_on) {
 838                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 839                 return 0;
 840         }
 841
 842         rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
 843         if (!rc)
 844                 dp_display->power_on = true;
 845
 846         return rc;
 847 }
 848
 849 static int dp_display_post_enable(struct msm_dp *dp_display)
 850 {
 851         struct dp_display_private *dp;
 852         u32 rate;
 853
 854         dp = container_of(dp_display, struct dp_display_private, dp_display);
 855
 856         rate = dp->link->link_params.rate;
 857
 858         if (dp->audio_supported) {
 859                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 860                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 861         }
 862
 863         /* signal the connect event late to synchronize video and display */
 864         dp_display_handle_plugged_change(dp_display, true);
 865
 866         if (dp_display->psr_supported)
 867                 dp_ctrl_config_psr(dp->ctrl);
 868
 869         return 0;
 870 }
 871
 872 static int dp_display_disable(struct dp_display_private *dp)
 873 {
 874         struct msm_dp *dp_display = &dp->dp_display;
 875
 876         if (!dp_display->power_on)
 877                 return 0;
 878
 879         /* wait only if audio was enabled */
 880         if (dp_display->audio_enabled) {
 881                 /* signal the disconnect event */
 882                 dp_display_handle_plugged_change(dp_display, false);
 883                 if (!wait_for_completion_timeout(&dp->audio_comp,
 884                                 HZ * 5))
 885                         DRM_ERROR("audio comp timeout\n");
 886         }
 887
 888         dp_display->audio_enabled = false;
 889
 890         if (dp->link->sink_count == 0) {
 891                 /*
 892                  * irq_hpd with sink_count = 0
 893                  * hdmi unplugged out of dongle
 894                  */
 895                 dp_ctrl_off_link_stream(dp->ctrl);
 896         } else {
 897                 /*
 898                  * unplugged interrupt
 899                  * dongle unplugged out of DUT
 900                  */
 901                 dp_ctrl_off(dp->ctrl);
 902                 dp_display_host_phy_exit(dp);
 903         }
 904
 905         dp_display->power_on = false;
 906
 907         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 908         return 0;
 909 }
 910
 911 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 912                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 913 {
 914         bool plugged;
 915
 916         dp_display->plugged_cb = fn;
 917         dp_display->codec_dev = codec_dev;
 918         plugged = dp_display->link_ready;
 919         dp_display_handle_plugged_change(dp_display, plugged);
 920
 921         return 0;
 922 }
 923
 924 /**
 925  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 926  * @bridge: Pointer to drm bridge structure
 927  * @info: display info
 928  * @mode: Pointer to drm mode structure
 929  * Returns: Validity status for specified mode
 930  */
 931 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 932                                           const struct drm_display_info *info,
 933                                           const struct drm_display_mode *mode)
 934 {
 935         const u32 num_components = 3, default_bpp = 24;
 936         struct dp_display_private *dp_display;
 937         struct dp_link_info *link_info;
 938         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 939         struct msm_dp *dp;
 940         int mode_pclk_khz = mode->clock;
 941
 942         dp = to_dp_bridge(bridge)->dp_display;
 943
 944         if (!dp || !mode_pclk_khz || !dp->connector) {
 945                 DRM_ERROR("invalid params\n");
 946                 return -EINVAL;
 947         }
 948
 949         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 950                 return MODE_CLOCK_HIGH;
 951
 952         dp_display = container_of(dp, struct dp_display_private, dp_display);
 953         link_info = &dp_display->panel->link_info;
 954
 955         mode_bpp = dp->connector->display_info.bpc * num_components;
 956         if (!mode_bpp)
 957                 mode_bpp = default_bpp;
 958
 959         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
 960                         mode_bpp, mode_pclk_khz);
 961
 962         mode_rate_khz = mode_pclk_khz * mode_bpp;
 963         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
 964
 965         if (mode_rate_khz > supported_rate_khz)
 966                 return MODE_BAD;
 967
 968         return MODE_OK;
 969 }
 970
 971 int dp_display_get_modes(struct msm_dp *dp)
 972 {
 973         struct dp_display_private *dp_display;
 974
 975         if (!dp) {
 976                 DRM_ERROR("invalid params\n");
 977                 return 0;
 978         }
 979
 980         dp_display = container_of(dp, struct dp_display_private, dp_display);
 981
 982         return dp_panel_get_modes(dp_display->panel,
 983                 dp->connector);
 984 }
 985
 986 bool dp_display_check_video_test(struct msm_dp *dp)
 987 {
 988         struct dp_display_private *dp_display;
 989
 990         dp_display = container_of(dp, struct dp_display_private, dp_display);
 991
 992         return dp_display->panel->video_test;
 993 }
 994
 995 int dp_display_get_test_bpp(struct msm_dp *dp)
 996 {
 997         struct dp_display_private *dp_display;
 998
 999         if (!dp) {
1000                 DRM_ERROR("invalid params\n");
1001                 return 0;
1002         }
1003
1004         dp_display = container_of(dp, struct dp_display_private, dp_display);
1005
1006         return dp_link_bit_depth_to_bpp(
1007                 dp_display->link->test_video.test_bit_depth);
1008 }
1009
1010 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1011 {
1012         struct dp_display_private *dp_display;
1013
1014         dp_display = container_of(dp, struct dp_display_private, dp_display);
1015
1016         /*
1017          * if we are reading registers we need the link clocks to be on
1018          * however till DP cable is connected this will not happen as we
1019          * do not know the resolution to power up with. Hence check the
1020          * power_on status before dumping DP registers to avoid crash due
1021          * to unclocked access
1022          */
1023         mutex_lock(&dp_display->event_mutex);
1024
1025         if (!dp->power_on) {
1026                 mutex_unlock(&dp_display->event_mutex);
1027                 return;
1028         }
1029
1030         dp_catalog_snapshot(dp_display->catalog, disp_state);
1031
1032         mutex_unlock(&dp_display->event_mutex);
1033 }
1034
1035 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1036 {
1037         struct dp_display_private *dp;
1038
1039         if (!dp_display) {
1040                 DRM_ERROR("invalid params\n");
1041                 return;
1042         }
1043
1044         dp = container_of(dp_display, struct dp_display_private, dp_display);
1045         dp_ctrl_set_psr(dp->ctrl, enter);
1046 }
1047
1048 static int hpd_event_thread(void *data)
1049 {
1050         struct dp_display_private *dp_priv;
1051         unsigned long flag;
1052         struct dp_event *todo;
1053         int timeout_mode = 0;
1054
1055         dp_priv = (struct dp_display_private *)data;
1056
1057         while (1) {
1058                 if (timeout_mode) {
1059                         wait_event_timeout(dp_priv->event_q,
1060                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1061                                         kthread_should_stop(), EVENT_TIMEOUT);
1062                 } else {
1063                         wait_event_interruptible(dp_priv->event_q,
1064                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1065                                         kthread_should_stop());
1066                 }
1067
1068                 if (kthread_should_stop())
1069                         break;
1070
1071                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1072                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1073                 if (todo->delay) {
1074                         struct dp_event *todo_next;
1075
1076                         dp_priv->event_gndx++;
1077                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1078
1079                         /* re enter delay event into q */
1080                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1081                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1082                         todo_next->event_id = todo->event_id;
1083                         todo_next->data = todo->data;
1084                         todo_next->delay = todo->delay - 1;
1085
1086                         /* clean up older event */
1087                         todo->event_id = EV_NO_EVENT;
1088                         todo->delay = 0;
1089
1090                         /* switch to timeout mode */
1091                         timeout_mode = 1;
1092                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1093                         continue;
1094                 }
1095
1096                 /* timeout with no events in q */
1097                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1098                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1099                         continue;
1100                 }
1101
1102                 dp_priv->event_gndx++;
1103                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1104                 timeout_mode = 0;
1105                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1106
1107                 switch (todo->event_id) {
1108                 case EV_HPD_PLUG_INT:
1109                         dp_hpd_plug_handle(dp_priv, todo->data);
1110                         break;
1111                 case EV_HPD_UNPLUG_INT:
1112                         dp_hpd_unplug_handle(dp_priv, todo->data);
1113                         break;
1114                 case EV_IRQ_HPD_INT:
1115                         dp_irq_hpd_handle(dp_priv, todo->data);
1116                         break;
1117                 case EV_USER_NOTIFICATION:
1118                         dp_display_send_hpd_notification(dp_priv,
1119                                                 todo->data);
1120                         break;
1121                 default:
1122                         break;
1123                 }
1124         }
1125
1126         return 0;
1127 }
1128
1129 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1130 {
1131         /* set event q to empty */
1132         dp_priv->event_gndx = 0;
1133         dp_priv->event_pndx = 0;
1134
1135         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1136         if (IS_ERR(dp_priv->ev_tsk))
1137                 return PTR_ERR(dp_priv->ev_tsk);
1138
1139         return 0;
1140 }
1141
1142 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1143 {
1144         struct dp_display_private *dp = dev_id;
1145         irqreturn_t ret = IRQ_NONE;
1146         u32 hpd_isr_status;
1147
1148         if (!dp) {
1149                 DRM_ERROR("invalid data\n");
1150                 return IRQ_NONE;
1151         }
1152
1153         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1154
1155         if (hpd_isr_status & 0x0F) {
1156                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1157                         dp->dp_display.connector_type, hpd_isr_status);
1158                 /* hpd related interrupts */
1159                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1160                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1161
1162                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1163                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1164                 }
1165
1166                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1167                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1168                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1169                 }
1170
1171                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1172                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1173
1174                 ret = IRQ_HANDLED;
1175         }
1176
1177         /* DP controller isr */
1178         ret |= dp_ctrl_isr(dp->ctrl);
1179
1180         /* DP aux isr */
1181         ret |= dp_aux_isr(dp->aux);
1182
1183         return ret;
1184 }
1185
1186 static int dp_display_request_irq(struct dp_display_private *dp)
1187 {
1188         int rc = 0;
1189         struct platform_device *pdev = dp->dp_display.pdev;
1190
1191         dp->irq = platform_get_irq(pdev, 0);
1192         if (dp->irq < 0) {
1193                 DRM_ERROR("failed to get irq\n");
1194                 return dp->irq;
1195         }
1196
1197         rc = devm_request_irq(&pdev->dev, dp->irq, dp_display_irq_handler,
1198                               IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
1199                               "dp_display_isr", dp);
1200
1201         if (rc < 0) {
1202                 DRM_ERROR("failed to request IRQ%u: %d\n",
1203                                 dp->irq, rc);
1204                 return rc;
1205         }
1206
1207         return 0;
1208 }
1209
1210 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1211 {
1212         const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1213         struct resource *res;
1214         int i;
1215
1216         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1217         if (!res)
1218                 return NULL;
1219
1220         for (i = 0; i < descs[i].io_start; i++) {
1221                 if (descs[i].io_start == res->start)
1222                         return &descs[i];
1223         }
1224
1225         dev_err(&pdev->dev, "unknown displayport instance\n");
1226         return NULL;
1227 }
1228
1229 static int dp_display_get_next_bridge(struct msm_dp *dp);
1230
1231 static int dp_display_probe_tail(struct device *dev)
1232 {
1233         struct msm_dp *dp = dev_get_drvdata(dev);
1234         int ret;
1235
1236         ret = dp_display_get_next_bridge(dp);
1237         if (ret)
1238                 return ret;
1239
1240         ret = component_add(dev, &dp_display_comp_ops);
1241         if (ret)
1242                 DRM_ERROR("component add failed, rc=%d\n", ret);
1243
1244         return ret;
1245 }
1246
1247 static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
1248 {
1249         return dp_display_probe_tail(aux->dev);
1250 }
1251
1252 static int dp_display_probe(struct platform_device *pdev)
1253 {
1254         int rc = 0;
1255         struct dp_display_private *dp;
1256         const struct msm_dp_desc *desc;
1257
1258         if (!pdev || !pdev->dev.of_node) {
1259                 DRM_ERROR("pdev not found\n");
1260                 return -ENODEV;
1261         }
1262
1263         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1264         if (!dp)
1265                 return -ENOMEM;
1266
1267         desc = dp_display_get_desc(pdev);
1268         if (!desc)
1269                 return -EINVAL;
1270
1271         dp->dp_display.pdev = pdev;
1272         dp->name = "drm_dp";
1273         dp->id = desc->id;
1274         dp->dp_display.connector_type = desc->connector_type;
1275         dp->wide_bus_en = desc->wide_bus_en;
1276         dp->dp_display.is_edp =
1277                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1278
1279         rc = dp_init_sub_modules(dp);
1280         if (rc) {
1281                 DRM_ERROR("init sub module failed\n");
1282                 return -EPROBE_DEFER;
1283         }
1284
1285         rc = dp->parser->parse(dp->parser);
1286         if (rc) {
1287                 DRM_ERROR("device tree parsing failed\n");
1288                 goto err;
1289         }
1290
1291         rc = dp_power_client_init(dp->power);
1292         if (rc) {
1293                 DRM_ERROR("Power client create failed\n");
1294                 goto err;
1295         }
1296
1297         /* setup event q */
1298         mutex_init(&dp->event_mutex);
1299         init_waitqueue_head(&dp->event_q);
1300         spin_lock_init(&dp->event_lock);
1301
1302         /* Store DP audio handle inside DP display */
1303         dp->dp_display.dp_audio = dp->audio;
1304
1305         init_completion(&dp->audio_comp);
1306
1307         platform_set_drvdata(pdev, &dp->dp_display);
1308
1309         rc = devm_pm_runtime_enable(&pdev->dev);
1310         if (rc)
1311                 goto err;
1312
1313         rc = dp_display_request_irq(dp);
1314         if (rc)
1315                 goto err;
1316
1317         if (dp->dp_display.is_edp) {
1318                 rc = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe);
1319                 if (rc) {
1320                         DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc);
1321                         goto err;
1322                 }
1323         } else {
1324                 rc = dp_display_probe_tail(&pdev->dev);
1325                 if (rc)
1326                         goto err;
1327         }
1328
1329         return rc;
1330
1331 err:
1332         dp_display_deinit_sub_modules(dp);
1333         return rc;
1334 }
1335
1336 static void dp_display_remove(struct platform_device *pdev)
1337 {
1338         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1339
1340         component_del(&pdev->dev, &dp_display_comp_ops);
1341         dp_display_deinit_sub_modules(dp);
1342         platform_set_drvdata(pdev, NULL);
1343 }
1344
1345 static int dp_pm_runtime_suspend(struct device *dev)
1346 {
1347         struct dp_display_private *dp = dev_get_dp_display_private(dev);
1348
1349         disable_irq(dp->irq);
1350
1351         if (dp->dp_display.is_edp) {
1352                 dp_display_host_phy_exit(dp);
1353                 dp_catalog_ctrl_hpd_disable(dp->catalog);
1354         }
1355         dp_display_host_deinit(dp);
1356
1357         return 0;
1358 }
1359
1360 static int dp_pm_runtime_resume(struct device *dev)
1361 {
1362         struct dp_display_private *dp = dev_get_dp_display_private(dev);
1363
1364         /*
1365          * for eDP, host cotroller, HPD block and PHY are enabled here
1366          * but with HPD irq disabled
1367          *
1368          * for DP, only host controller is enabled here.
1369          * HPD block is enabled at dp_bridge_hpd_enable()
1370          * PHY will be enabled at plugin handler later
1371          */
1372         dp_display_host_init(dp);
1373         if (dp->dp_display.is_edp) {
1374                 dp_catalog_ctrl_hpd_enable(dp->catalog);
1375                 dp_display_host_phy_init(dp);
1376         }
1377
1378         enable_irq(dp->irq);
1379         return 0;
1380 }
1381
1382 static const struct dev_pm_ops dp_pm_ops = {
1383         SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
1384         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1385                                 pm_runtime_force_resume)
1386 };
1387
1388 static struct platform_driver dp_display_driver = {
1389         .probe  = dp_display_probe,
1390         .remove_new = dp_display_remove,
1391         .driver = {
1392                 .name = "msm-dp-display",
1393                 .of_match_table = dp_dt_match,
1394                 .suppress_bind_attrs = true,
1395                 .pm = &dp_pm_ops,
1396         },
1397 };
1398
1399 int __init msm_dp_register(void)
1400 {
1401         int ret;
1402
1403         ret = platform_driver_register(&dp_display_driver);
1404         if (ret)
1405                 DRM_ERROR("Dp display driver register failed");
1406
1407         return ret;
1408 }
1409
1410 void __exit msm_dp_unregister(void)
1411 {
1412         platform_driver_unregister(&dp_display_driver);
1413 }
1414
1415 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1416 {
1417         struct dp_display_private *dp;
1418
1419         dp = container_of(dp_display, struct dp_display_private, dp_display);
1420
1421         return dp->wide_bus_en;
1422 }
1423
1424 void dp_display_debugfs_init(struct msm_dp *dp_display, struct dentry *root, bool is_edp)
1425 {
1426         struct dp_display_private *dp;
1427         struct device *dev;
1428         int rc;
1429
1430         dp = container_of(dp_display, struct dp_display_private, dp_display);
1431         dev = &dp->dp_display.pdev->dev;
1432
1433         dp->debug = dp_debug_get(dev, dp->panel,
1434                                         dp->link, dp->dp_display.connector,
1435                                         root, is_edp);
1436         if (IS_ERR(dp->debug)) {
1437                 rc = PTR_ERR(dp->debug);
1438                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1439                 dp->debug = NULL;
1440         }
1441 }
1442
1443 static int dp_display_get_next_bridge(struct msm_dp *dp)
1444 {
1445         int rc;
1446         struct dp_display_private *dp_priv;
1447
1448         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1449
1450         /*
1451          * External bridges are mandatory for eDP interfaces: one has to
1452          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1453          *
1454          * For DisplayPort interfaces external bridges are optional, so
1455          * silently ignore an error if one is not present (-ENODEV).
1456          */
1457         rc = devm_dp_parser_find_next_bridge(&dp->pdev->dev, dp_priv->parser);
1458         if (!dp->is_edp && rc == -ENODEV)
1459                 return 0;
1460
1461         if (!rc)
1462                 dp->next_bridge = dp_priv->parser->next_bridge;
1463
1464         return rc;
1465 }
1466
1467 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1468                         struct drm_encoder *encoder)
1469 {
1470         struct dp_display_private *dp_priv;
1471         int ret;
1472
1473         dp_display->drm_dev = dev;
1474
1475         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1476
1477         ret = dp_bridge_init(dp_display, dev, encoder);
1478         if (ret) {
1479                 DRM_DEV_ERROR(dev->dev,
1480                         "failed to create dp bridge: %d\n", ret);
1481                 return ret;
1482         }
1483
1484         dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1485         if (IS_ERR(dp_display->connector)) {
1486                 ret = PTR_ERR(dp_display->connector);
1487                 DRM_DEV_ERROR(dev->dev,
1488                         "failed to create dp connector: %d\n", ret);
1489                 dp_display->connector = NULL;
1490                 return ret;
1491         }
1492
1493         dp_priv->panel->connector = dp_display->connector;
1494
1495         return 0;
1496 }
1497
1498 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1499                              struct drm_bridge_state *old_bridge_state)
1500 {
1501         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1502         struct msm_dp *dp = dp_bridge->dp_display;
1503         int rc = 0;
1504         struct dp_display_private *dp_display;
1505         u32 state;
1506         bool force_link_train = false;
1507
1508         dp_display = container_of(dp, struct dp_display_private, dp_display);
1509         if (!dp_display->dp_mode.drm_mode.clock) {
1510                 DRM_ERROR("invalid params\n");
1511                 return;
1512         }
1513
1514         if (dp->is_edp)
1515                 dp_hpd_plug_handle(dp_display, 0);
1516
1517         mutex_lock(&dp_display->event_mutex);
1518         if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
1519                 DRM_ERROR("failed to pm_runtime_resume\n");
1520                 mutex_unlock(&dp_display->event_mutex);
1521                 return;
1522         }
1523
1524         state = dp_display->hpd_state;
1525         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1526                 mutex_unlock(&dp_display->event_mutex);
1527                 return;
1528         }
1529
1530         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1531         if (rc) {
1532                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1533                 mutex_unlock(&dp_display->event_mutex);
1534                 return;
1535         }
1536
1537         state =  dp_display->hpd_state;
1538
1539         if (state == ST_DISPLAY_OFF) {
1540                 dp_display_host_phy_init(dp_display);
1541                 force_link_train = true;
1542         }
1543
1544         dp_display_enable(dp_display, force_link_train);
1545
1546         rc = dp_display_post_enable(dp);
1547         if (rc) {
1548                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1549                 dp_display_disable(dp_display);
1550         }
1551
1552         /* completed connection */
1553         dp_display->hpd_state = ST_CONNECTED;
1554
1555         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1556         mutex_unlock(&dp_display->event_mutex);
1557 }
1558
1559 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1560                               struct drm_bridge_state *old_bridge_state)
1561 {
1562         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1563         struct msm_dp *dp = dp_bridge->dp_display;
1564         struct dp_display_private *dp_display;
1565
1566         dp_display = container_of(dp, struct dp_display_private, dp_display);
1567
1568         dp_ctrl_push_idle(dp_display->ctrl);
1569 }
1570
1571 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1572                                    struct drm_bridge_state *old_bridge_state)
1573 {
1574         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1575         struct msm_dp *dp = dp_bridge->dp_display;
1576         u32 state;
1577         struct dp_display_private *dp_display;
1578
1579         dp_display = container_of(dp, struct dp_display_private, dp_display);
1580
1581         if (dp->is_edp)
1582                 dp_hpd_unplug_handle(dp_display, 0);
1583
1584         mutex_lock(&dp_display->event_mutex);
1585
1586         state = dp_display->hpd_state;
1587         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
1588                 drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
1589                            dp->connector_type, state);
1590
1591         dp_display_disable(dp_display);
1592
1593         state =  dp_display->hpd_state;
1594         if (state == ST_DISCONNECT_PENDING) {
1595                 /* completed disconnection */
1596                 dp_display->hpd_state = ST_DISCONNECTED;
1597         } else {
1598                 dp_display->hpd_state = ST_DISPLAY_OFF;
1599         }
1600
1601         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1602
1603         pm_runtime_put_sync(&dp->pdev->dev);
1604         mutex_unlock(&dp_display->event_mutex);
1605 }
1606
1607 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1608                         const struct drm_display_mode *mode,
1609                         const struct drm_display_mode *adjusted_mode)
1610 {
1611         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1612         struct msm_dp *dp = dp_bridge->dp_display;
1613         struct dp_display_private *dp_display;
1614
1615         dp_display = container_of(dp, struct dp_display_private, dp_display);
1616
1617         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1618
1619         if (dp_display_check_video_test(dp))
1620                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1621         else /* Default num_components per pixel = 3 */
1622                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1623
1624         if (!dp_display->dp_mode.bpp)
1625                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1626
1627         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1628
1629         dp_display->dp_mode.v_active_low =
1630                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1631
1632         dp_display->dp_mode.h_active_low =
1633                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1634 }
1635
1636 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1637 {
1638         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1639         struct msm_dp *dp_display = dp_bridge->dp_display;
1640         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1641
1642         /*
1643          * this is for external DP with hpd irq enabled case,
1644          * step-1: dp_pm_runtime_resume() enable dp host only
1645          * step-2: enable hdp block and have hpd irq enabled here
1646          * step-3: waiting for plugin irq while phy is not initialized
1647          * step-4: DP PHY is initialized at plugin handler before link training
1648          *
1649          */
1650         mutex_lock(&dp->event_mutex);
1651         if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
1652                 DRM_ERROR("failed to resume power\n");
1653                 mutex_unlock(&dp->event_mutex);
1654                 return;
1655         }
1656
1657         dp_catalog_ctrl_hpd_enable(dp->catalog);
1658
1659         /* enable HDP interrupts */
1660         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1661
1662         dp_display->internal_hpd = true;
1663         mutex_unlock(&dp->event_mutex);
1664 }
1665
1666 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1667 {
1668         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1669         struct msm_dp *dp_display = dp_bridge->dp_display;
1670         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1671
1672         mutex_lock(&dp->event_mutex);
1673         /* disable HDP interrupts */
1674         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1675         dp_catalog_ctrl_hpd_disable(dp->catalog);
1676
1677         dp_display->internal_hpd = false;
1678
1679         pm_runtime_put_sync(&dp_display->pdev->dev);
1680         mutex_unlock(&dp->event_mutex);
1681 }
1682
1683 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1684                           enum drm_connector_status status)
1685 {
1686         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1687         struct msm_dp *dp_display = dp_bridge->dp_display;
1688         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1689
1690         /* Without next_bridge interrupts are handled by the DP core directly */
1691         if (dp_display->internal_hpd)
1692                 return;
1693
1694         if (!dp_display->link_ready && status == connector_status_connected)
1695                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1696         else if (dp_display->link_ready && status == connector_status_disconnected)
1697                 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1698 }