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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/slab.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/component.h>
  11 #include <linux/of_irq.h>
  12 #include <linux/delay.h>
  13 #include <drm/display/drm_dp_aux_bus.h>
  14
  15 #include "msm_drv.h"
  16 #include "msm_kms.h"
  17 #include "dp_parser.h"
  18 #include "dp_power.h"
  19 #include "dp_catalog.h"
  20 #include "dp_aux.h"
  21 #include "dp_reg.h"
  22 #include "dp_link.h"
  23 #include "dp_panel.h"
  24 #include "dp_ctrl.h"
  25 #include "dp_display.h"
  26 #include "dp_drm.h"
  27 #include "dp_audio.h"
  28 #include "dp_debug.h"
  29
  30 static bool psr_enabled = false;
  31 module_param(psr_enabled, bool, 0);
  32 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
  33
  34 #define HPD_STRING_SIZE 30
  35
  36 enum {
  37         ISR_DISCONNECTED,
  38         ISR_CONNECT_PENDING,
  39         ISR_CONNECTED,
  40         ISR_HPD_REPLUG_COUNT,
  41         ISR_IRQ_HPD_PULSE_COUNT,
  42         ISR_HPD_LO_GLITH_COUNT,
  43 };
  44
  45 /* event thread connection state */
  46 enum {
  47         ST_DISCONNECTED,
  48         ST_MAINLINK_READY,
  49         ST_CONNECTED,
  50         ST_DISCONNECT_PENDING,
  51         ST_DISPLAY_OFF,
  52         ST_SUSPENDED,
  53 };
  54
  55 enum {
  56         EV_NO_EVENT,
  57         /* hpd events */
  58         EV_HPD_INIT_SETUP,
  59         EV_HPD_PLUG_INT,
  60         EV_IRQ_HPD_INT,
  61         EV_HPD_UNPLUG_INT,
  62         EV_USER_NOTIFICATION,
  63 };
  64
  65 #define EVENT_TIMEOUT   (HZ/10) /* 100ms */
  66 #define DP_EVENT_Q_MAX  8
  67
  68 #define DP_TIMEOUT_NONE         0
  69
  70 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  71
  72 struct dp_event {
  73         u32 event_id;
  74         u32 data;
  75         u32 delay;
  76 };
  77
  78 struct dp_display_private {
  79         char *name;
  80         int irq;
  81
  82         unsigned int id;
  83
  84         /* state variables */
  85         bool core_initialized;
  86         bool phy_initialized;
  87         bool hpd_irq_on;
  88         bool audio_supported;
  89
  90         struct drm_device *drm_dev;
  91         struct platform_device *pdev;
  92         struct dentry *root;
  93
  94         struct dp_parser  *parser;
  95         struct dp_power   *power;
  96         struct dp_catalog *catalog;
  97         struct drm_dp_aux *aux;
  98         struct dp_link    *link;
  99         struct dp_panel   *panel;
 100         struct dp_ctrl    *ctrl;
 101         struct dp_debug   *debug;
 102
 103         struct dp_display_mode dp_mode;
 104         struct msm_dp dp_display;
 105
 106         /* wait for audio signaling */
 107         struct completion audio_comp;
 108
 109         /* event related only access by event thread */
 110         struct mutex event_mutex;
 111         wait_queue_head_t event_q;
 112         u32 hpd_state;
 113         u32 event_pndx;
 114         u32 event_gndx;
 115         struct task_struct *ev_tsk;
 116         struct dp_event event_list[DP_EVENT_Q_MAX];
 117         spinlock_t event_lock;
 118
 119         bool wide_bus_en;
 120
 121         struct dp_audio *audio;
 122 };
 123
 124 struct msm_dp_desc {
 125         phys_addr_t io_start;
 126         unsigned int id;
 127         unsigned int connector_type;
 128         bool wide_bus_en;
 129 };
 130
 131 static const struct msm_dp_desc sc7180_dp_descs[] = {
 132         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 133         {}
 134 };
 135
 136 static const struct msm_dp_desc sc7280_dp_descs[] = {
 137         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 138         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 139         {}
 140 };
 141
 142 static const struct msm_dp_desc sc8180x_dp_descs[] = {
 143         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 144         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 145         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
 146         {}
 147 };
 148
 149 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
 150         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 151         { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 152         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 153         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 154         { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 155         { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 156         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 157         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
 158         {}
 159 };
 160
 161 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
 162         { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 163         { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 164         { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 165         { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
 166         {}
 167 };
 168
 169 static const struct msm_dp_desc sm8350_dp_descs[] = {
 170         { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 171         {}
 172 };
 173
 174 static const struct msm_dp_desc sm8650_dp_descs[] = {
 175         { .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
 176         {}
 177 };
 178
 179 static const struct of_device_id dp_dt_match[] = {
 180         { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
 181         { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
 182         { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
 183         { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
 184         { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
 185         { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
 186         { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
 187         { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
 188         { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
 189         { .compatible = "qcom,sm8650-dp", .data = &sm8650_dp_descs },
 190         {}
 191 };
 192
 193 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
 194 {
 195         struct msm_dp *dp = dev_get_drvdata(dev);
 196
 197         return container_of(dp, struct dp_display_private, dp_display);
 198 }
 199
 200 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 201                                                 u32 data, u32 delay)
 202 {
 203         unsigned long flag;
 204         struct dp_event *todo;
 205         int pndx;
 206
 207         spin_lock_irqsave(&dp_priv->event_lock, flag);
 208         pndx = dp_priv->event_pndx + 1;
 209         pndx %= DP_EVENT_Q_MAX;
 210         if (pndx == dp_priv->event_gndx) {
 211                 pr_err("event_q is full: pndx=%d gndx=%d\n",
 212                         dp_priv->event_pndx, dp_priv->event_gndx);
 213                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 214                 return -EPERM;
 215         }
 216         todo = &dp_priv->event_list[dp_priv->event_pndx++];
 217         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
 218         todo->event_id = event;
 219         todo->data = data;
 220         todo->delay = delay;
 221         wake_up(&dp_priv->event_q);
 222         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 223
 224         return 0;
 225 }
 226
 227 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
 228 {
 229         unsigned long flag;
 230         struct dp_event *todo;
 231         u32     gndx;
 232
 233         spin_lock_irqsave(&dp_priv->event_lock, flag);
 234         if (dp_priv->event_pndx == dp_priv->event_gndx) {
 235                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 236                 return -ENOENT;
 237         }
 238
 239         gndx = dp_priv->event_gndx;
 240         while (dp_priv->event_pndx != gndx) {
 241                 todo = &dp_priv->event_list[gndx];
 242                 if (todo->event_id == event) {
 243                         todo->event_id = EV_NO_EVENT;   /* deleted */
 244                         todo->delay = 0;
 245                 }
 246                 gndx++;
 247                 gndx %= DP_EVENT_Q_MAX;
 248         }
 249         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 250
 251         return 0;
 252 }
 253
 254 void dp_display_signal_audio_start(struct msm_dp *dp_display)
 255 {
 256         struct dp_display_private *dp;
 257
 258         dp = container_of(dp_display, struct dp_display_private, dp_display);
 259
 260         reinit_completion(&dp->audio_comp);
 261 }
 262
 263 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
 264 {
 265         struct dp_display_private *dp;
 266
 267         dp = container_of(dp_display, struct dp_display_private, dp_display);
 268
 269         complete_all(&dp->audio_comp);
 270 }
 271
 272 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
 273
 274 static int dp_display_bind(struct device *dev, struct device *master,
 275                            void *data)
 276 {
 277         int rc = 0;
 278         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 279         struct msm_drm_private *priv = dev_get_drvdata(master);
 280         struct drm_device *drm = priv->dev;
 281
 282         dp->dp_display.drm_dev = drm;
 283         priv->dp[dp->id] = &dp->dp_display;
 284
 285         rc = dp->parser->parse(dp->parser);
 286         if (rc) {
 287                 DRM_ERROR("device tree parsing failed\n");
 288                 goto end;
 289         }
 290
 291
 292         dp->drm_dev = drm;
 293         dp->aux->drm_dev = drm;
 294         rc = dp_aux_register(dp->aux);
 295         if (rc) {
 296                 DRM_ERROR("DRM DP AUX register failed\n");
 297                 goto end;
 298         }
 299
 300         rc = dp_power_client_init(dp->power);
 301         if (rc) {
 302                 DRM_ERROR("Power client create failed\n");
 303                 goto end;
 304         }
 305
 306         rc = dp_register_audio_driver(dev, dp->audio);
 307         if (rc) {
 308                 DRM_ERROR("Audio registration Dp failed\n");
 309                 goto end;
 310         }
 311
 312         rc = dp_hpd_event_thread_start(dp);
 313         if (rc) {
 314                 DRM_ERROR("Event thread create failed\n");
 315                 goto end;
 316         }
 317
 318         return 0;
 319 end:
 320         return rc;
 321 }
 322
 323 static void dp_display_unbind(struct device *dev, struct device *master,
 324                               void *data)
 325 {
 326         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 327         struct msm_drm_private *priv = dev_get_drvdata(master);
 328
 329         /* disable all HPD interrupts */
 330         if (dp->core_initialized)
 331                 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
 332
 333         kthread_stop(dp->ev_tsk);
 334
 335         of_dp_aux_depopulate_bus(dp->aux);
 336
 337         dp_power_client_deinit(dp->power);
 338         dp_unregister_audio_driver(dev, dp->audio);
 339         dp_aux_unregister(dp->aux);
 340         dp->drm_dev = NULL;
 341         dp->aux->drm_dev = NULL;
 342         priv->dp[dp->id] = NULL;
 343 }
 344
 345 static const struct component_ops dp_display_comp_ops = {
 346         .bind = dp_display_bind,
 347         .unbind = dp_display_unbind,
 348 };
 349
 350 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
 351 {
 352         return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
 353                 DP_DWN_STRM_PORT_PRESENT);
 354 }
 355
 356 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
 357 {
 358         drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
 359                         dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
 360                 dp->link->sink_count);
 361         return dp_display_is_ds_bridge(dp->panel) &&
 362                 (dp->link->sink_count == 0);
 363 }
 364
 365 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 366 {
 367         struct dp_display_private *dp;
 368         struct drm_connector *connector;
 369
 370         dp = container_of(dp_display, struct dp_display_private, dp_display);
 371
 372         connector = dp->dp_display.connector;
 373         drm_helper_hpd_irq_event(connector->dev);
 374 }
 375
 376
 377 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 378                                             bool hpd)
 379 {
 380         if ((hpd && dp->dp_display.is_connected) ||
 381                         (!hpd && !dp->dp_display.is_connected)) {
 382                 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 383                                 (hpd ? "on" : "off"));
 384                 return 0;
 385         }
 386
 387         /* reset video pattern flag on disconnect */
 388         if (!hpd)
 389                 dp->panel->video_test = false;
 390
 391         dp->dp_display.is_connected = hpd;
 392
 393         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 394                         dp->dp_display.connector_type, hpd);
 395         dp_display_send_hpd_event(&dp->dp_display);
 396
 397         return 0;
 398 }
 399
 400 static int dp_display_process_hpd_high(struct dp_display_private *dp)
 401 {
 402         int rc = 0;
 403         struct edid *edid;
 404
 405         dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
 406         dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
 407
 408         drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
 409                 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
 410
 411         rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 412         if (rc)
 413                 goto end;
 414
 415         dp_link_process_request(dp->link);
 416
 417         edid = dp->panel->edid;
 418
 419         dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
 420
 421         dp->audio_supported = drm_detect_monitor_audio(edid);
 422         dp_panel_handle_sink_request(dp->panel);
 423
 424         dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
 425
 426         /*
 427          * set sink to normal operation mode -- D0
 428          * before dpcd read
 429          */
 430         dp_link_psm_config(dp->link, &dp->panel->link_info, false);
 431
 432         dp_link_reset_phy_params_vx_px(dp->link);
 433         rc = dp_ctrl_on_link(dp->ctrl);
 434         if (rc) {
 435                 DRM_ERROR("failed to complete DP link training\n");
 436                 goto end;
 437         }
 438
 439         dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
 440
 441 end:
 442         return rc;
 443 }
 444
 445 static void dp_display_host_phy_init(struct dp_display_private *dp)
 446 {
 447         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 448                 dp->dp_display.connector_type, dp->core_initialized,
 449                 dp->phy_initialized);
 450
 451         if (!dp->phy_initialized) {
 452                 dp_ctrl_phy_init(dp->ctrl);
 453                 dp->phy_initialized = true;
 454         }
 455 }
 456
 457 static void dp_display_host_phy_exit(struct dp_display_private *dp)
 458 {
 459         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 460                 dp->dp_display.connector_type, dp->core_initialized,
 461                 dp->phy_initialized);
 462
 463         if (dp->phy_initialized) {
 464                 dp_ctrl_phy_exit(dp->ctrl);
 465                 dp->phy_initialized = false;
 466         }
 467 }
 468
 469 static void dp_display_host_init(struct dp_display_private *dp)
 470 {
 471         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 472                 dp->dp_display.connector_type, dp->core_initialized,
 473                 dp->phy_initialized);
 474
 475         dp_power_init(dp->power);
 476         dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
 477         dp_aux_init(dp->aux);
 478         dp->core_initialized = true;
 479 }
 480
 481 static void dp_display_host_deinit(struct dp_display_private *dp)
 482 {
 483         drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
 484                 dp->dp_display.connector_type, dp->core_initialized,
 485                 dp->phy_initialized);
 486
 487         dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
 488         dp_aux_deinit(dp->aux);
 489         dp_power_deinit(dp->power);
 490         dp->core_initialized = false;
 491 }
 492
 493 static int dp_display_usbpd_configure_cb(struct device *dev)
 494 {
 495         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 496
 497         dp_display_host_phy_init(dp);
 498
 499         return dp_display_process_hpd_high(dp);
 500 }
 501
 502 static int dp_display_notify_disconnect(struct device *dev)
 503 {
 504         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 505
 506         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 507
 508         return 0;
 509 }
 510
 511 static void dp_display_handle_video_request(struct dp_display_private *dp)
 512 {
 513         if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
 514                 dp->panel->video_test = true;
 515                 dp_link_send_test_response(dp->link);
 516         }
 517 }
 518
 519 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
 520 {
 521         int rc = 0;
 522
 523         if (dp_display_is_sink_count_zero(dp)) {
 524                 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 525                 if (dp->hpd_state != ST_DISCONNECTED) {
 526                         dp->hpd_state = ST_DISCONNECT_PENDING;
 527                         dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 528                 }
 529         } else {
 530                 if (dp->hpd_state == ST_DISCONNECTED) {
 531                         dp->hpd_state = ST_MAINLINK_READY;
 532                         rc = dp_display_process_hpd_high(dp);
 533                         if (rc)
 534                                 dp->hpd_state = ST_DISCONNECTED;
 535                 }
 536         }
 537
 538         return rc;
 539 }
 540
 541 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 542 {
 543         u32 sink_request = dp->link->sink_request;
 544
 545         drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
 546         if (dp->hpd_state == ST_DISCONNECTED) {
 547                 if (sink_request & DP_LINK_STATUS_UPDATED) {
 548                         drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
 549                                                         sink_request);
 550                         DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
 551                         return -EINVAL;
 552                 }
 553         }
 554
 555         dp_ctrl_handle_sink_request(dp->ctrl);
 556
 557         if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
 558                 dp_display_handle_video_request(dp);
 559
 560         return 0;
 561 }
 562
 563 static int dp_display_usbpd_attention_cb(struct device *dev)
 564 {
 565         int rc = 0;
 566         u32 sink_request;
 567         struct dp_display_private *dp = dev_get_dp_display_private(dev);
 568
 569         /* check for any test request issued by sink */
 570         rc = dp_link_process_request(dp->link);
 571         if (!rc) {
 572                 sink_request = dp->link->sink_request;
 573                 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
 574                                         dp->hpd_state, sink_request);
 575                 if (sink_request & DS_PORT_STATUS_CHANGED)
 576                         rc = dp_display_handle_port_ststus_changed(dp);
 577                 else
 578                         rc = dp_display_handle_irq_hpd(dp);
 579         }
 580
 581         return rc;
 582 }
 583
 584 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 585 {
 586         u32 state;
 587         int ret;
 588
 589         mutex_lock(&dp->event_mutex);
 590
 591         state =  dp->hpd_state;
 592         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 593                         dp->dp_display.connector_type, state);
 594
 595         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 596                 mutex_unlock(&dp->event_mutex);
 597                 return 0;
 598         }
 599
 600         if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
 601                 mutex_unlock(&dp->event_mutex);
 602                 return 0;
 603         }
 604
 605         if (state == ST_DISCONNECT_PENDING) {
 606                 /* wait until ST_DISCONNECTED */
 607                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
 608                 mutex_unlock(&dp->event_mutex);
 609                 return 0;
 610         }
 611
 612         ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
 613         if (ret) {      /* link train failed */
 614                 dp->hpd_state = ST_DISCONNECTED;
 615         } else {
 616                 dp->hpd_state = ST_MAINLINK_READY;
 617         }
 618
 619         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 620                         dp->dp_display.connector_type, state);
 621         mutex_unlock(&dp->event_mutex);
 622
 623         /* uevent will complete connection part */
 624         return 0;
 625 };
 626
 627 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 628                 bool plugged)
 629 {
 630         struct dp_display_private *dp;
 631
 632         dp = container_of(dp_display,
 633                         struct dp_display_private, dp_display);
 634
 635         /* notify audio subsystem only if sink supports audio */
 636         if (dp_display->plugged_cb && dp_display->codec_dev &&
 637                         dp->audio_supported)
 638                 dp_display->plugged_cb(dp_display->codec_dev, plugged);
 639 }
 640
 641 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 642 {
 643         u32 state;
 644
 645         mutex_lock(&dp->event_mutex);
 646
 647         state = dp->hpd_state;
 648
 649         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 650                         dp->dp_display.connector_type, state);
 651
 652         /* unplugged, no more irq_hpd handle */
 653         dp_del_event(dp, EV_IRQ_HPD_INT);
 654
 655         if (state == ST_DISCONNECTED) {
 656                 /* triggered by irq_hdp with sink_count = 0 */
 657                 if (dp->link->sink_count == 0) {
 658                         dp_display_host_phy_exit(dp);
 659                 }
 660                 dp_display_notify_disconnect(&dp->pdev->dev);
 661                 mutex_unlock(&dp->event_mutex);
 662                 return 0;
 663         } else if (state == ST_DISCONNECT_PENDING) {
 664                 mutex_unlock(&dp->event_mutex);
 665                 return 0;
 666         } else if (state == ST_MAINLINK_READY) {
 667                 dp_ctrl_off_link(dp->ctrl);
 668                 dp_display_host_phy_exit(dp);
 669                 dp->hpd_state = ST_DISCONNECTED;
 670                 dp_display_notify_disconnect(&dp->pdev->dev);
 671                 mutex_unlock(&dp->event_mutex);
 672                 return 0;
 673         }
 674
 675         /*
 676          * We don't need separate work for disconnect as
 677          * connect/attention interrupts are disabled
 678          */
 679         dp_display_notify_disconnect(&dp->pdev->dev);
 680
 681         if (state == ST_DISPLAY_OFF) {
 682                 dp->hpd_state = ST_DISCONNECTED;
 683         } else {
 684                 dp->hpd_state = ST_DISCONNECT_PENDING;
 685         }
 686
 687         /* signal the disconnect event early to ensure proper teardown */
 688         dp_display_handle_plugged_change(&dp->dp_display, false);
 689
 690         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 691                         dp->dp_display.connector_type, state);
 692
 693         /* uevent will complete disconnection part */
 694         mutex_unlock(&dp->event_mutex);
 695         return 0;
 696 }
 697
 698 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
 699 {
 700         u32 state;
 701
 702         mutex_lock(&dp->event_mutex);
 703
 704         /* irq_hpd can happen at either connected or disconnected state */
 705         state =  dp->hpd_state;
 706         drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 707                         dp->dp_display.connector_type, state);
 708
 709         if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
 710                 mutex_unlock(&dp->event_mutex);
 711                 return 0;
 712         }
 713
 714         if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
 715                 /* wait until ST_CONNECTED */
 716                 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
 717                 mutex_unlock(&dp->event_mutex);
 718                 return 0;
 719         }
 720
 721         dp_display_usbpd_attention_cb(&dp->pdev->dev);
 722
 723         drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
 724                         dp->dp_display.connector_type, state);
 725
 726         mutex_unlock(&dp->event_mutex);
 727
 728         return 0;
 729 }
 730
 731 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 732 {
 733         dp_debug_put(dp->debug);
 734         dp_audio_put(dp->audio);
 735         dp_panel_put(dp->panel);
 736         dp_aux_put(dp->aux);
 737 }
 738
 739 static int dp_init_sub_modules(struct dp_display_private *dp)
 740 {
 741         int rc = 0;
 742         struct device *dev = &dp->pdev->dev;
 743         struct dp_panel_in panel_in = {
 744                 .dev = dev,
 745         };
 746
 747         dp->parser = dp_parser_get(dp->pdev);
 748         if (IS_ERR(dp->parser)) {
 749                 rc = PTR_ERR(dp->parser);
 750                 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
 751                 dp->parser = NULL;
 752                 goto error;
 753         }
 754
 755         dp->catalog = dp_catalog_get(dev, &dp->parser->io);
 756         if (IS_ERR(dp->catalog)) {
 757                 rc = PTR_ERR(dp->catalog);
 758                 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
 759                 dp->catalog = NULL;
 760                 goto error;
 761         }
 762
 763         dp->power = dp_power_get(dev, dp->parser);
 764         if (IS_ERR(dp->power)) {
 765                 rc = PTR_ERR(dp->power);
 766                 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
 767                 dp->power = NULL;
 768                 goto error;
 769         }
 770
 771         dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
 772         if (IS_ERR(dp->aux)) {
 773                 rc = PTR_ERR(dp->aux);
 774                 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
 775                 dp->aux = NULL;
 776                 goto error;
 777         }
 778
 779         dp->link = dp_link_get(dev, dp->aux);
 780         if (IS_ERR(dp->link)) {
 781                 rc = PTR_ERR(dp->link);
 782                 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
 783                 dp->link = NULL;
 784                 goto error_link;
 785         }
 786
 787         panel_in.aux = dp->aux;
 788         panel_in.catalog = dp->catalog;
 789         panel_in.link = dp->link;
 790
 791         dp->panel = dp_panel_get(&panel_in);
 792         if (IS_ERR(dp->panel)) {
 793                 rc = PTR_ERR(dp->panel);
 794                 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
 795                 dp->panel = NULL;
 796                 goto error_link;
 797         }
 798
 799         dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
 800                                dp->power, dp->catalog, dp->parser);
 801         if (IS_ERR(dp->ctrl)) {
 802                 rc = PTR_ERR(dp->ctrl);
 803                 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
 804                 dp->ctrl = NULL;
 805                 goto error_ctrl;
 806         }
 807
 808         dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
 809         if (IS_ERR(dp->audio)) {
 810                 rc = PTR_ERR(dp->audio);
 811                 pr_err("failed to initialize audio, rc = %d\n", rc);
 812                 dp->audio = NULL;
 813                 goto error_ctrl;
 814         }
 815
 816         /* populate wide_bus_en to differernt layers */
 817         dp->ctrl->wide_bus_en = dp->wide_bus_en;
 818         dp->catalog->wide_bus_en = dp->wide_bus_en;
 819
 820         return rc;
 821
 822 error_ctrl:
 823         dp_panel_put(dp->panel);
 824 error_link:
 825         dp_aux_put(dp->aux);
 826 error:
 827         return rc;
 828 }
 829
 830 static int dp_display_set_mode(struct msm_dp *dp_display,
 831                                struct dp_display_mode *mode)
 832 {
 833         struct dp_display_private *dp;
 834
 835         dp = container_of(dp_display, struct dp_display_private, dp_display);
 836
 837         drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
 838         dp->panel->dp_mode.bpp = mode->bpp;
 839         dp->panel->dp_mode.capabilities = mode->capabilities;
 840         dp_panel_init_panel_info(dp->panel);
 841         return 0;
 842 }
 843
 844 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
 845 {
 846         int rc = 0;
 847         struct msm_dp *dp_display = &dp->dp_display;
 848
 849         drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
 850         if (dp_display->power_on) {
 851                 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
 852                 return 0;
 853         }
 854
 855         rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
 856         if (!rc)
 857                 dp_display->power_on = true;
 858
 859         return rc;
 860 }
 861
 862 static int dp_display_post_enable(struct msm_dp *dp_display)
 863 {
 864         struct dp_display_private *dp;
 865         u32 rate;
 866
 867         dp = container_of(dp_display, struct dp_display_private, dp_display);
 868
 869         rate = dp->link->link_params.rate;
 870
 871         if (dp->audio_supported) {
 872                 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
 873                 dp->audio->lane_count = dp->link->link_params.num_lanes;
 874         }
 875
 876         /* signal the connect event late to synchronize video and display */
 877         dp_display_handle_plugged_change(dp_display, true);
 878
 879         if (dp_display->psr_supported)
 880                 dp_ctrl_config_psr(dp->ctrl);
 881
 882         return 0;
 883 }
 884
 885 static int dp_display_disable(struct dp_display_private *dp)
 886 {
 887         struct msm_dp *dp_display = &dp->dp_display;
 888
 889         if (!dp_display->power_on)
 890                 return 0;
 891
 892         /* wait only if audio was enabled */
 893         if (dp_display->audio_enabled) {
 894                 /* signal the disconnect event */
 895                 dp_display_handle_plugged_change(dp_display, false);
 896                 if (!wait_for_completion_timeout(&dp->audio_comp,
 897                                 HZ * 5))
 898                         DRM_ERROR("audio comp timeout\n");
 899         }
 900
 901         dp_display->audio_enabled = false;
 902
 903         if (dp->link->sink_count == 0) {
 904                 /*
 905                  * irq_hpd with sink_count = 0
 906                  * hdmi unplugged out of dongle
 907                  */
 908                 dp_ctrl_off_link_stream(dp->ctrl);
 909         } else {
 910                 /*
 911                  * unplugged interrupt
 912                  * dongle unplugged out of DUT
 913                  */
 914                 dp_ctrl_off(dp->ctrl);
 915                 dp_display_host_phy_exit(dp);
 916         }
 917
 918         dp_display->power_on = false;
 919
 920         drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
 921         return 0;
 922 }
 923
 924 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 925                 hdmi_codec_plugged_cb fn, struct device *codec_dev)
 926 {
 927         bool plugged;
 928
 929         dp_display->plugged_cb = fn;
 930         dp_display->codec_dev = codec_dev;
 931         plugged = dp_display->is_connected;
 932         dp_display_handle_plugged_change(dp_display, plugged);
 933
 934         return 0;
 935 }
 936
 937 /**
 938  * dp_bridge_mode_valid - callback to determine if specified mode is valid
 939  * @bridge: Pointer to drm bridge structure
 940  * @info: display info
 941  * @mode: Pointer to drm mode structure
 942  * Returns: Validity status for specified mode
 943  */
 944 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 945                                           const struct drm_display_info *info,
 946                                           const struct drm_display_mode *mode)
 947 {
 948         const u32 num_components = 3, default_bpp = 24;
 949         struct dp_display_private *dp_display;
 950         struct dp_link_info *link_info;
 951         u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
 952         struct msm_dp *dp;
 953         int mode_pclk_khz = mode->clock;
 954
 955         dp = to_dp_bridge(bridge)->dp_display;
 956
 957         if (!dp || !mode_pclk_khz || !dp->connector) {
 958                 DRM_ERROR("invalid params\n");
 959                 return -EINVAL;
 960         }
 961
 962         if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 963                 return MODE_CLOCK_HIGH;
 964
 965         dp_display = container_of(dp, struct dp_display_private, dp_display);
 966         link_info = &dp_display->panel->link_info;
 967
 968         mode_bpp = dp->connector->display_info.bpc * num_components;
 969         if (!mode_bpp)
 970                 mode_bpp = default_bpp;
 971
 972         mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
 973                         mode_bpp, mode_pclk_khz);
 974
 975         mode_rate_khz = mode_pclk_khz * mode_bpp;
 976         supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
 977
 978         if (mode_rate_khz > supported_rate_khz)
 979                 return MODE_BAD;
 980
 981         return MODE_OK;
 982 }
 983
 984 int dp_display_get_modes(struct msm_dp *dp)
 985 {
 986         struct dp_display_private *dp_display;
 987
 988         if (!dp) {
 989                 DRM_ERROR("invalid params\n");
 990                 return 0;
 991         }
 992
 993         dp_display = container_of(dp, struct dp_display_private, dp_display);
 994
 995         return dp_panel_get_modes(dp_display->panel,
 996                 dp->connector);
 997 }
 998
 999 bool dp_display_check_video_test(struct msm_dp *dp)
1000 {
1001         struct dp_display_private *dp_display;
1002
1003         dp_display = container_of(dp, struct dp_display_private, dp_display);
1004
1005         return dp_display->panel->video_test;
1006 }
1007
1008 int dp_display_get_test_bpp(struct msm_dp *dp)
1009 {
1010         struct dp_display_private *dp_display;
1011
1012         if (!dp) {
1013                 DRM_ERROR("invalid params\n");
1014                 return 0;
1015         }
1016
1017         dp_display = container_of(dp, struct dp_display_private, dp_display);
1018
1019         return dp_link_bit_depth_to_bpp(
1020                 dp_display->link->test_video.test_bit_depth);
1021 }
1022
1023 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1024 {
1025         struct dp_display_private *dp_display;
1026
1027         dp_display = container_of(dp, struct dp_display_private, dp_display);
1028
1029         /*
1030          * if we are reading registers we need the link clocks to be on
1031          * however till DP cable is connected this will not happen as we
1032          * do not know the resolution to power up with. Hence check the
1033          * power_on status before dumping DP registers to avoid crash due
1034          * to unclocked access
1035          */
1036         mutex_lock(&dp_display->event_mutex);
1037
1038         if (!dp->power_on) {
1039                 mutex_unlock(&dp_display->event_mutex);
1040                 return;
1041         }
1042
1043         dp_catalog_snapshot(dp_display->catalog, disp_state);
1044
1045         mutex_unlock(&dp_display->event_mutex);
1046 }
1047
1048 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1049 {
1050         struct dp_display_private *dp;
1051
1052         if (!dp_display) {
1053                 DRM_ERROR("invalid params\n");
1054                 return;
1055         }
1056
1057         dp = container_of(dp_display, struct dp_display_private, dp_display);
1058         dp_ctrl_set_psr(dp->ctrl, enter);
1059 }
1060
1061 static int hpd_event_thread(void *data)
1062 {
1063         struct dp_display_private *dp_priv;
1064         unsigned long flag;
1065         struct dp_event *todo;
1066         int timeout_mode = 0;
1067
1068         dp_priv = (struct dp_display_private *)data;
1069
1070         while (1) {
1071                 if (timeout_mode) {
1072                         wait_event_timeout(dp_priv->event_q,
1073                                 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1074                                         kthread_should_stop(), EVENT_TIMEOUT);
1075                 } else {
1076                         wait_event_interruptible(dp_priv->event_q,
1077                                 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1078                                         kthread_should_stop());
1079                 }
1080
1081                 if (kthread_should_stop())
1082                         break;
1083
1084                 spin_lock_irqsave(&dp_priv->event_lock, flag);
1085                 todo = &dp_priv->event_list[dp_priv->event_gndx];
1086                 if (todo->delay) {
1087                         struct dp_event *todo_next;
1088
1089                         dp_priv->event_gndx++;
1090                         dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1091
1092                         /* re enter delay event into q */
1093                         todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1094                         dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1095                         todo_next->event_id = todo->event_id;
1096                         todo_next->data = todo->data;
1097                         todo_next->delay = todo->delay - 1;
1098
1099                         /* clean up older event */
1100                         todo->event_id = EV_NO_EVENT;
1101                         todo->delay = 0;
1102
1103                         /* switch to timeout mode */
1104                         timeout_mode = 1;
1105                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1106                         continue;
1107                 }
1108
1109                 /* timeout with no events in q */
1110                 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1111                         spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1112                         continue;
1113                 }
1114
1115                 dp_priv->event_gndx++;
1116                 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1117                 timeout_mode = 0;
1118                 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1119
1120                 switch (todo->event_id) {
1121                 case EV_HPD_INIT_SETUP:
1122                         dp_display_host_init(dp_priv);
1123                         break;
1124                 case EV_HPD_PLUG_INT:
1125                         dp_hpd_plug_handle(dp_priv, todo->data);
1126                         break;
1127                 case EV_HPD_UNPLUG_INT:
1128                         dp_hpd_unplug_handle(dp_priv, todo->data);
1129                         break;
1130                 case EV_IRQ_HPD_INT:
1131                         dp_irq_hpd_handle(dp_priv, todo->data);
1132                         break;
1133                 case EV_USER_NOTIFICATION:
1134                         dp_display_send_hpd_notification(dp_priv,
1135                                                 todo->data);
1136                         break;
1137                 default:
1138                         break;
1139                 }
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1146 {
1147         /* set event q to empty */
1148         dp_priv->event_gndx = 0;
1149         dp_priv->event_pndx = 0;
1150
1151         dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1152         if (IS_ERR(dp_priv->ev_tsk))
1153                 return PTR_ERR(dp_priv->ev_tsk);
1154
1155         return 0;
1156 }
1157
1158 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1159 {
1160         struct dp_display_private *dp = dev_id;
1161         irqreturn_t ret = IRQ_NONE;
1162         u32 hpd_isr_status;
1163
1164         if (!dp) {
1165                 DRM_ERROR("invalid data\n");
1166                 return IRQ_NONE;
1167         }
1168
1169         hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1170
1171         if (hpd_isr_status & 0x0F) {
1172                 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1173                         dp->dp_display.connector_type, hpd_isr_status);
1174                 /* hpd related interrupts */
1175                 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1176                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1177
1178                 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1179                         dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1180                 }
1181
1182                 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1183                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1184                         dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1185                 }
1186
1187                 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1188                         dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1189
1190                 ret = IRQ_HANDLED;
1191         }
1192
1193         /* DP controller isr */
1194         ret |= dp_ctrl_isr(dp->ctrl);
1195
1196         /* DP aux isr */
1197         ret |= dp_aux_isr(dp->aux);
1198
1199         return ret;
1200 }
1201
1202 int dp_display_request_irq(struct msm_dp *dp_display)
1203 {
1204         int rc = 0;
1205         struct dp_display_private *dp;
1206
1207         if (!dp_display) {
1208                 DRM_ERROR("invalid input\n");
1209                 return -EINVAL;
1210         }
1211
1212         dp = container_of(dp_display, struct dp_display_private, dp_display);
1213
1214         dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1215         if (!dp->irq) {
1216                 DRM_ERROR("failed to get irq\n");
1217                 return -EINVAL;
1218         }
1219
1220         rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
1221                         dp_display_irq_handler,
1222                         IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1223         if (rc < 0) {
1224                 DRM_ERROR("failed to request IRQ%u: %d\n",
1225                                 dp->irq, rc);
1226                 return rc;
1227         }
1228
1229         return 0;
1230 }
1231
1232 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1233 {
1234         const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1235         struct resource *res;
1236         int i;
1237
1238         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1239         if (!res)
1240                 return NULL;
1241
1242         for (i = 0; i < descs[i].io_start; i++) {
1243                 if (descs[i].io_start == res->start)
1244                         return &descs[i];
1245         }
1246
1247         dev_err(&pdev->dev, "unknown displayport instance\n");
1248         return NULL;
1249 }
1250
1251 static int dp_display_probe(struct platform_device *pdev)
1252 {
1253         int rc = 0;
1254         struct dp_display_private *dp;
1255         const struct msm_dp_desc *desc;
1256
1257         if (!pdev || !pdev->dev.of_node) {
1258                 DRM_ERROR("pdev not found\n");
1259                 return -ENODEV;
1260         }
1261
1262         dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1263         if (!dp)
1264                 return -ENOMEM;
1265
1266         desc = dp_display_get_desc(pdev);
1267         if (!desc)
1268                 return -EINVAL;
1269
1270         dp->pdev = pdev;
1271         dp->name = "drm_dp";
1272         dp->id = desc->id;
1273         dp->dp_display.connector_type = desc->connector_type;
1274         dp->wide_bus_en = desc->wide_bus_en;
1275         dp->dp_display.is_edp =
1276                 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1277
1278         rc = dp_init_sub_modules(dp);
1279         if (rc) {
1280                 DRM_ERROR("init sub module failed\n");
1281                 return -EPROBE_DEFER;
1282         }
1283
1284         /* setup event q */
1285         mutex_init(&dp->event_mutex);
1286         init_waitqueue_head(&dp->event_q);
1287         spin_lock_init(&dp->event_lock);
1288
1289         /* Store DP audio handle inside DP display */
1290         dp->dp_display.dp_audio = dp->audio;
1291
1292         init_completion(&dp->audio_comp);
1293
1294         platform_set_drvdata(pdev, &dp->dp_display);
1295
1296         rc = component_add(&pdev->dev, &dp_display_comp_ops);
1297         if (rc) {
1298                 DRM_ERROR("component add failed, rc=%d\n", rc);
1299                 dp_display_deinit_sub_modules(dp);
1300         }
1301
1302         return rc;
1303 }
1304
1305 static int dp_display_remove(struct platform_device *pdev)
1306 {
1307         struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1308
1309         component_del(&pdev->dev, &dp_display_comp_ops);
1310         dp_display_deinit_sub_modules(dp);
1311
1312         platform_set_drvdata(pdev, NULL);
1313
1314         return 0;
1315 }
1316
1317 static int dp_pm_resume(struct device *dev)
1318 {
1319         struct platform_device *pdev = to_platform_device(dev);
1320         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1321         struct dp_display_private *dp;
1322         int sink_count = 0;
1323
1324         dp = container_of(dp_display, struct dp_display_private, dp_display);
1325
1326         mutex_lock(&dp->event_mutex);
1327
1328         drm_dbg_dp(dp->drm_dev,
1329                 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1330                 dp->dp_display.connector_type, dp->core_initialized,
1331                 dp->phy_initialized, dp_display->power_on);
1332
1333         /* start from disconnected state */
1334         dp->hpd_state = ST_DISCONNECTED;
1335
1336         /* turn on dp ctrl/phy */
1337         dp_display_host_init(dp);
1338
1339         if (dp_display->is_edp)
1340                 dp_catalog_ctrl_hpd_enable(dp->catalog);
1341
1342         if (dp_catalog_link_is_connected(dp->catalog)) {
1343                 /*
1344                  * set sink to normal operation mode -- D0
1345                  * before dpcd read
1346                  */
1347                 dp_display_host_phy_init(dp);
1348                 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1349                 sink_count = drm_dp_read_sink_count(dp->aux);
1350                 if (sink_count < 0)
1351                         sink_count = 0;
1352
1353                 dp_display_host_phy_exit(dp);
1354         }
1355
1356         dp->link->sink_count = sink_count;
1357         /*
1358          * can not declared display is connected unless
1359          * HDMI cable is plugged in and sink_count of
1360          * dongle become 1
1361          * also only signal audio when disconnected
1362          */
1363         if (dp->link->sink_count) {
1364                 dp->dp_display.is_connected = true;
1365         } else {
1366                 dp->dp_display.is_connected = false;
1367                 dp_display_handle_plugged_change(dp_display, false);
1368         }
1369
1370         drm_dbg_dp(dp->drm_dev,
1371                 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1372                 dp->dp_display.connector_type, dp->link->sink_count,
1373                 dp->dp_display.is_connected, dp->core_initialized,
1374                 dp->phy_initialized, dp_display->power_on);
1375
1376         mutex_unlock(&dp->event_mutex);
1377
1378         return 0;
1379 }
1380
1381 static int dp_pm_suspend(struct device *dev)
1382 {
1383         struct platform_device *pdev = to_platform_device(dev);
1384         struct msm_dp *dp_display = platform_get_drvdata(pdev);
1385         struct dp_display_private *dp;
1386
1387         dp = container_of(dp_display, struct dp_display_private, dp_display);
1388
1389         mutex_lock(&dp->event_mutex);
1390
1391         drm_dbg_dp(dp->drm_dev,
1392                 "Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
1393                 dp->dp_display.connector_type, dp->core_initialized,
1394                 dp->phy_initialized, dp_display->power_on);
1395
1396         /* mainlink enabled */
1397         if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1398                 dp_ctrl_off_link_stream(dp->ctrl);
1399
1400         dp_display_host_phy_exit(dp);
1401
1402         /* host_init will be called at pm_resume */
1403         dp_display_host_deinit(dp);
1404
1405         dp->hpd_state = ST_SUSPENDED;
1406
1407         drm_dbg_dp(dp->drm_dev,
1408                 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1409                 dp->dp_display.connector_type, dp->core_initialized,
1410                 dp->phy_initialized, dp_display->power_on);
1411
1412         mutex_unlock(&dp->event_mutex);
1413
1414         return 0;
1415 }
1416
1417 static const struct dev_pm_ops dp_pm_ops = {
1418         .suspend = dp_pm_suspend,
1419         .resume =  dp_pm_resume,
1420 };
1421
1422 static struct platform_driver dp_display_driver = {
1423         .probe  = dp_display_probe,
1424         .remove = dp_display_remove,
1425         .driver = {
1426                 .name = "msm-dp-display",
1427                 .of_match_table = dp_dt_match,
1428                 .suppress_bind_attrs = true,
1429                 .pm = &dp_pm_ops,
1430         },
1431 };
1432
1433 int __init msm_dp_register(void)
1434 {
1435         int ret;
1436
1437         ret = platform_driver_register(&dp_display_driver);
1438         if (ret)
1439                 DRM_ERROR("Dp display driver register failed");
1440
1441         return ret;
1442 }
1443
1444 void __exit msm_dp_unregister(void)
1445 {
1446         platform_driver_unregister(&dp_display_driver);
1447 }
1448
1449 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1450 {
1451         struct dp_display_private *dp;
1452
1453         if (!dp_display)
1454                 return;
1455
1456         dp = container_of(dp_display, struct dp_display_private, dp_display);
1457
1458         if (!dp_display->is_edp)
1459                 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
1460 }
1461
1462 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1463 {
1464         struct dp_display_private *dp;
1465
1466         dp = container_of(dp_display, struct dp_display_private, dp_display);
1467
1468         return dp->wide_bus_en;
1469 }
1470
1471 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1472 {
1473         struct dp_display_private *dp;
1474         struct device *dev;
1475         int rc;
1476
1477         dp = container_of(dp_display, struct dp_display_private, dp_display);
1478         dev = &dp->pdev->dev;
1479
1480         dp->debug = dp_debug_get(dev, dp->panel,
1481                                         dp->link, dp->dp_display.connector,
1482                                         minor);
1483         if (IS_ERR(dp->debug)) {
1484                 rc = PTR_ERR(dp->debug);
1485                 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1486                 dp->debug = NULL;
1487         }
1488 }
1489
1490 static int dp_display_get_next_bridge(struct msm_dp *dp)
1491 {
1492         int rc;
1493         struct dp_display_private *dp_priv;
1494         struct device_node *aux_bus;
1495         struct device *dev;
1496
1497         dp_priv = container_of(dp, struct dp_display_private, dp_display);
1498         dev = &dp_priv->pdev->dev;
1499         aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1500
1501         if (aux_bus && dp->is_edp) {
1502                 dp_display_host_init(dp_priv);
1503                 dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
1504                 dp_display_host_phy_init(dp_priv);
1505
1506                 /*
1507                  * The code below assumes that the panel will finish probing
1508                  * by the time devm_of_dp_aux_populate_ep_devices() returns.
1509                  * This isn't a great assumption since it will fail if the
1510                  * panel driver is probed asynchronously but is the best we
1511                  * can do without a bigger driver reorganization.
1512                  */
1513                 rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
1514                 of_node_put(aux_bus);
1515                 if (rc)
1516                         goto error;
1517         } else if (dp->is_edp) {
1518                 DRM_ERROR("eDP aux_bus not found\n");
1519                 return -ENODEV;
1520         }
1521
1522         /*
1523          * External bridges are mandatory for eDP interfaces: one has to
1524          * provide at least an eDP panel (which gets wrapped into panel-bridge).
1525          *
1526          * For DisplayPort interfaces external bridges are optional, so
1527          * silently ignore an error if one is not present (-ENODEV).
1528          */
1529         rc = devm_dp_parser_find_next_bridge(dp->drm_dev->dev, dp_priv->parser);
1530         if (!dp->is_edp && rc == -ENODEV)
1531                 return 0;
1532
1533         if (!rc) {
1534                 dp->next_bridge = dp_priv->parser->next_bridge;
1535                 return 0;
1536         }
1537
1538 error:
1539         if (dp->is_edp) {
1540                 of_dp_aux_depopulate_bus(dp_priv->aux);
1541                 dp_display_host_phy_exit(dp_priv);
1542                 dp_display_host_deinit(dp_priv);
1543         }
1544         return rc;
1545 }
1546
1547 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1548                         struct drm_encoder *encoder)
1549 {
1550         struct msm_drm_private *priv = dev->dev_private;
1551         struct dp_display_private *dp_priv;
1552         int ret;
1553
1554         dp_display->drm_dev = dev;
1555
1556         dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1557
1558         ret = dp_display_request_irq(dp_display);
1559         if (ret) {
1560                 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1561                 return ret;
1562         }
1563
1564         ret = dp_display_get_next_bridge(dp_display);
1565         if (ret)
1566                 return ret;
1567
1568         dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1569         if (IS_ERR(dp_display->bridge)) {
1570                 ret = PTR_ERR(dp_display->bridge);
1571                 DRM_DEV_ERROR(dev->dev,
1572                         "failed to create dp bridge: %d\n", ret);
1573                 dp_display->bridge = NULL;
1574                 return ret;
1575         }
1576
1577         priv->bridges[priv->num_bridges++] = dp_display->bridge;
1578
1579         dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1580         if (IS_ERR(dp_display->connector)) {
1581                 ret = PTR_ERR(dp_display->connector);
1582                 DRM_DEV_ERROR(dev->dev,
1583                         "failed to create dp connector: %d\n", ret);
1584                 dp_display->connector = NULL;
1585                 return ret;
1586         }
1587
1588         dp_priv->panel->connector = dp_display->connector;
1589
1590         return 0;
1591 }
1592
1593 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1594                              struct drm_bridge_state *old_bridge_state)
1595 {
1596         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1597         struct msm_dp *dp = dp_bridge->dp_display;
1598         int rc = 0;
1599         struct dp_display_private *dp_display;
1600         u32 state;
1601         bool force_link_train = false;
1602
1603         dp_display = container_of(dp, struct dp_display_private, dp_display);
1604         if (!dp_display->dp_mode.drm_mode.clock) {
1605                 DRM_ERROR("invalid params\n");
1606                 return;
1607         }
1608
1609         if (dp->is_edp)
1610                 dp_hpd_plug_handle(dp_display, 0);
1611
1612         mutex_lock(&dp_display->event_mutex);
1613
1614         state = dp_display->hpd_state;
1615         if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1616                 mutex_unlock(&dp_display->event_mutex);
1617                 return;
1618         }
1619
1620         rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1621         if (rc) {
1622                 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1623                 mutex_unlock(&dp_display->event_mutex);
1624                 return;
1625         }
1626
1627         state =  dp_display->hpd_state;
1628
1629         if (state == ST_DISPLAY_OFF) {
1630                 dp_display_host_phy_init(dp_display);
1631                 force_link_train = true;
1632         }
1633
1634         dp_display_enable(dp_display, force_link_train);
1635
1636         rc = dp_display_post_enable(dp);
1637         if (rc) {
1638                 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1639                 dp_display_disable(dp_display);
1640         }
1641
1642         /* completed connection */
1643         dp_display->hpd_state = ST_CONNECTED;
1644
1645         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1646         mutex_unlock(&dp_display->event_mutex);
1647 }
1648
1649 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1650                               struct drm_bridge_state *old_bridge_state)
1651 {
1652         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1653         struct msm_dp *dp = dp_bridge->dp_display;
1654         struct dp_display_private *dp_display;
1655
1656         dp_display = container_of(dp, struct dp_display_private, dp_display);
1657
1658         dp_ctrl_push_idle(dp_display->ctrl);
1659 }
1660
1661 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1662                                    struct drm_bridge_state *old_bridge_state)
1663 {
1664         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1665         struct msm_dp *dp = dp_bridge->dp_display;
1666         u32 state;
1667         struct dp_display_private *dp_display;
1668
1669         dp_display = container_of(dp, struct dp_display_private, dp_display);
1670
1671         if (dp->is_edp)
1672                 dp_hpd_unplug_handle(dp_display, 0);
1673
1674         mutex_lock(&dp_display->event_mutex);
1675
1676         state = dp_display->hpd_state;
1677         if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1678                 mutex_unlock(&dp_display->event_mutex);
1679                 return;
1680         }
1681
1682         dp_display_disable(dp_display);
1683
1684         state =  dp_display->hpd_state;
1685         if (state == ST_DISCONNECT_PENDING) {
1686                 /* completed disconnection */
1687                 dp_display->hpd_state = ST_DISCONNECTED;
1688         } else {
1689                 dp_display->hpd_state = ST_DISPLAY_OFF;
1690         }
1691
1692         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1693         mutex_unlock(&dp_display->event_mutex);
1694 }
1695
1696 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1697                         const struct drm_display_mode *mode,
1698                         const struct drm_display_mode *adjusted_mode)
1699 {
1700         struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1701         struct msm_dp *dp = dp_bridge->dp_display;
1702         struct dp_display_private *dp_display;
1703
1704         dp_display = container_of(dp, struct dp_display_private, dp_display);
1705
1706         memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1707
1708         if (dp_display_check_video_test(dp))
1709                 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1710         else /* Default num_components per pixel = 3 */
1711                 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1712
1713         if (!dp_display->dp_mode.bpp)
1714                 dp_display->dp_mode.bpp = 24; /* Default bpp */
1715
1716         drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1717
1718         dp_display->dp_mode.v_active_low =
1719                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1720
1721         dp_display->dp_mode.h_active_low =
1722                 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1723 }
1724
1725 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1726 {
1727         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1728         struct msm_dp *dp_display = dp_bridge->dp_display;
1729         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1730
1731         mutex_lock(&dp->event_mutex);
1732         dp_catalog_ctrl_hpd_enable(dp->catalog);
1733
1734         /* enable HDP interrupts */
1735         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1736
1737         dp_display->internal_hpd = true;
1738         mutex_unlock(&dp->event_mutex);
1739 }
1740
1741 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1742 {
1743         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1744         struct msm_dp *dp_display = dp_bridge->dp_display;
1745         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1746
1747         mutex_lock(&dp->event_mutex);
1748         /* disable HDP interrupts */
1749         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1750         dp_catalog_ctrl_hpd_disable(dp->catalog);
1751
1752         dp_display->internal_hpd = false;
1753         mutex_unlock(&dp->event_mutex);
1754 }
1755
1756 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1757                           enum drm_connector_status status)
1758 {
1759         struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1760         struct msm_dp *dp_display = dp_bridge->dp_display;
1761         struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1762
1763         /* Without next_bridge interrupts are handled by the DP core directly */
1764         if (dp_display->internal_hpd)
1765                 return;
1766
1767         if (!dp->core_initialized) {
1768                 drm_dbg_dp(dp->drm_dev, "not initialized\n");
1769                 return;
1770         }
1771
1772         if (!dp_display->is_connected && status == connector_status_connected)
1773                 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1774         else if (dp_display->is_connected && status == connector_status_disconnected)
1775                 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1776 }