drivers/gpu/drm/msm/dsi/dsi_manager.c

   1 /*
   2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include "msm_kms.h"
  15 #include "dsi.h"
  16
  17 #define DSI_CLOCK_MASTER        DSI_0
  18 #define DSI_CLOCK_SLAVE         DSI_1
  19
  20 #define DSI_LEFT                DSI_0
  21 #define DSI_RIGHT               DSI_1
  22
  23 /* According to the current drm framework sequence, take the encoder of
  24  * DSI_1 as master encoder
  25  */
  26 #define DSI_ENCODER_MASTER      DSI_1
  27 #define DSI_ENCODER_SLAVE       DSI_0
  28
  29 struct msm_dsi_manager {
  30         struct msm_dsi *dsi[DSI_MAX];
  31
  32         bool is_dual_dsi;
  33         bool is_sync_needed;
  34         int master_dsi_link_id;
  35 };
  36
  37 static struct msm_dsi_manager msm_dsim_glb;
  38
  39 #define IS_DUAL_DSI()           (msm_dsim_glb.is_dual_dsi)
  40 #define IS_SYNC_NEEDED()        (msm_dsim_glb.is_sync_needed)
  41 #define IS_MASTER_DSI_LINK(id)  (msm_dsim_glb.master_dsi_link_id == id)
  42
  43 static inline struct msm_dsi *dsi_mgr_get_dsi(int id)
  44 {
  45         return msm_dsim_glb.dsi[id];
  46 }
  47
  48 static inline struct msm_dsi *dsi_mgr_get_other_dsi(int id)
  49 {
  50         return msm_dsim_glb.dsi[(id + 1) % DSI_MAX];
  51 }
  52
  53 static int dsi_mgr_parse_dual_dsi(struct device_node *np, int id)
  54 {
  55         struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
  56
  57         /* We assume 2 dsi nodes have the same information of dual-dsi and
  58          * sync-mode, and only one node specifies master in case of dual mode.
  59          */
  60         if (!msm_dsim->is_dual_dsi)
  61                 msm_dsim->is_dual_dsi = of_property_read_bool(
  62                                                 np, "qcom,dual-dsi-mode");
  63
  64         if (msm_dsim->is_dual_dsi) {
  65                 if (of_property_read_bool(np, "qcom,master-dsi"))
  66                         msm_dsim->master_dsi_link_id = id;
  67                 if (!msm_dsim->is_sync_needed)
  68                         msm_dsim->is_sync_needed = of_property_read_bool(
  69                                         np, "qcom,sync-dual-dsi");
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int dsi_mgr_host_register(int id)
  76 {
  77         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
  78         struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
  79         struct msm_dsi *clk_master_dsi = dsi_mgr_get_dsi(DSI_CLOCK_MASTER);
  80         struct msm_dsi_pll *src_pll;
  81         int ret;
  82
  83         if (!IS_DUAL_DSI()) {
  84                 ret = msm_dsi_host_register(msm_dsi->host, true);
  85                 if (ret)
  86                         return ret;
  87
  88                 src_pll = msm_dsi_phy_get_pll(msm_dsi->phy);
  89                 ret = msm_dsi_host_set_src_pll(msm_dsi->host, src_pll);
  90         } else if (!other_dsi) {
  91                 ret = 0;
  92         } else {
  93                 struct msm_dsi *mdsi = IS_MASTER_DSI_LINK(id) ?
  94                                         msm_dsi : other_dsi;
  95                 struct msm_dsi *sdsi = IS_MASTER_DSI_LINK(id) ?
  96                                         other_dsi : msm_dsi;
  97                 /* Register slave host first, so that slave DSI device
  98                  * has a chance to probe, and do not block the master
  99                  * DSI device's probe.
 100                  * Also, do not check defer for the slave host,
 101                  * because only master DSI device adds the panel to global
 102                  * panel list. The panel's device is the master DSI device.
 103                  */
 104                 ret = msm_dsi_host_register(sdsi->host, false);
 105                 if (ret)
 106                         return ret;
 107                 ret = msm_dsi_host_register(mdsi->host, true);
 108                 if (ret)
 109                         return ret;
 110
 111                 /* PLL0 is to drive both 2 DSI link clocks in Dual DSI mode. */
 112                 src_pll = msm_dsi_phy_get_pll(clk_master_dsi->phy);
 113                 ret = msm_dsi_host_set_src_pll(msm_dsi->host, src_pll);
 114                 if (ret)
 115                         return ret;
 116                 ret = msm_dsi_host_set_src_pll(other_dsi->host, src_pll);
 117         }
 118
 119         return ret;
 120 }
 121
 122 struct dsi_connector {
 123         struct drm_connector base;
 124         int id;
 125 };
 126
 127 struct dsi_bridge {
 128         struct drm_bridge base;
 129         int id;
 130 };
 131
 132 #define to_dsi_connector(x) container_of(x, struct dsi_connector, base)
 133 #define to_dsi_bridge(x) container_of(x, struct dsi_bridge, base)
 134
 135 static inline int dsi_mgr_connector_get_id(struct drm_connector *connector)
 136 {
 137         struct dsi_connector *dsi_connector = to_dsi_connector(connector);
 138         return dsi_connector->id;
 139 }
 140
 141 static int dsi_mgr_bridge_get_id(struct drm_bridge *bridge)
 142 {
 143         struct dsi_bridge *dsi_bridge = to_dsi_bridge(bridge);
 144         return dsi_bridge->id;
 145 }
 146
 147 static enum drm_connector_status dsi_mgr_connector_detect(
 148                 struct drm_connector *connector, bool force)
 149 {
 150         int id = dsi_mgr_connector_get_id(connector);
 151         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 152         struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
 153         struct msm_drm_private *priv = connector->dev->dev_private;
 154         struct msm_kms *kms = priv->kms;
 155
 156         DBG("id=%d", id);
 157         if (!msm_dsi->panel) {
 158                 msm_dsi->panel = msm_dsi_host_get_panel(msm_dsi->host,
 159                                                 &msm_dsi->device_flags);
 160
 161                 /* There is only 1 panel in the global panel list
 162                  * for dual DSI mode. Therefore slave dsi should get
 163                  * the drm_panel instance from master dsi, and
 164                  * keep using the panel flags got from the current DSI link.
 165                  */
 166                 if (!msm_dsi->panel && IS_DUAL_DSI() &&
 167                         !IS_MASTER_DSI_LINK(id) && other_dsi)
 168                         msm_dsi->panel = msm_dsi_host_get_panel(
 169                                         other_dsi->host, NULL);
 170
 171                 if (msm_dsi->panel && IS_DUAL_DSI())
 172                         drm_object_attach_property(&connector->base,
 173                                 connector->dev->mode_config.tile_property, 0);
 174
 175                 /* Set split display info to kms once dual DSI panel is
 176                  * connected to both hosts.
 177                  */
 178                 if (msm_dsi->panel && IS_DUAL_DSI() &&
 179                         other_dsi && other_dsi->panel) {
 180                         bool cmd_mode = !(msm_dsi->device_flags &
 181                                                 MIPI_DSI_MODE_VIDEO);
 182                         struct drm_encoder *encoder = msm_dsi_get_encoder(
 183                                         dsi_mgr_get_dsi(DSI_ENCODER_MASTER));
 184                         struct drm_encoder *slave_enc = msm_dsi_get_encoder(
 185                                         dsi_mgr_get_dsi(DSI_ENCODER_SLAVE));
 186
 187                         if (kms->funcs->set_split_display)
 188                                 kms->funcs->set_split_display(kms, encoder,
 189                                                         slave_enc, cmd_mode);
 190                         else
 191                                 pr_err("mdp does not support dual DSI\n");
 192                 }
 193         }
 194
 195         return msm_dsi->panel ? connector_status_connected :
 196                 connector_status_disconnected;
 197 }
 198
 199 static void dsi_mgr_connector_destroy(struct drm_connector *connector)
 200 {
 201         DBG("");
 202         drm_connector_unregister(connector);
 203         drm_connector_cleanup(connector);
 204 }
 205
 206 static void dsi_dual_connector_fix_modes(struct drm_connector *connector)
 207 {
 208         struct drm_display_mode *mode, *m;
 209
 210         /* Only support left-right mode */
 211         list_for_each_entry_safe(mode, m, &connector->probed_modes, head) {
 212                 mode->clock >>= 1;
 213                 mode->hdisplay >>= 1;
 214                 mode->hsync_start >>= 1;
 215                 mode->hsync_end >>= 1;
 216                 mode->htotal >>= 1;
 217                 drm_mode_set_name(mode);
 218         }
 219 }
 220
 221 static int dsi_dual_connector_tile_init(
 222                         struct drm_connector *connector, int id)
 223 {
 224         struct drm_display_mode *mode;
 225         /* Fake topology id */
 226         char topo_id[8] = {'M', 'S', 'M', 'D', 'U', 'D', 'S', 'I'};
 227
 228         if (connector->tile_group) {
 229                 DBG("Tile property has been initialized");
 230                 return 0;
 231         }
 232
 233         /* Use the first mode only for now */
 234         mode = list_first_entry(&connector->probed_modes,
 235                                 struct drm_display_mode,
 236                                 head);
 237         if (!mode)
 238                 return -EINVAL;
 239
 240         connector->tile_group = drm_mode_get_tile_group(
 241                                         connector->dev, topo_id);
 242         if (!connector->tile_group)
 243                 connector->tile_group = drm_mode_create_tile_group(
 244                                         connector->dev, topo_id);
 245         if (!connector->tile_group) {
 246                 pr_err("%s: failed to create tile group\n", __func__);
 247                 return -ENOMEM;
 248         }
 249
 250         connector->has_tile = true;
 251         connector->tile_is_single_monitor = true;
 252
 253         /* mode has been fixed */
 254         connector->tile_h_size = mode->hdisplay;
 255         connector->tile_v_size = mode->vdisplay;
 256
 257         /* Only support left-right mode */
 258         connector->num_h_tile = 2;
 259         connector->num_v_tile = 1;
 260
 261         connector->tile_v_loc = 0;
 262         connector->tile_h_loc = (id == DSI_RIGHT) ? 1 : 0;
 263
 264         return 0;
 265 }
 266
 267 static int dsi_mgr_connector_get_modes(struct drm_connector *connector)
 268 {
 269         int id = dsi_mgr_connector_get_id(connector);
 270         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 271         struct drm_panel *panel = msm_dsi->panel;
 272         int ret, num;
 273
 274         if (!panel)
 275                 return 0;
 276
 277         /* Since we have 2 connectors, but only 1 drm_panel in dual DSI mode,
 278          * panel should not attach to any connector.
 279          * Only temporarily attach panel to the current connector here,
 280          * to let panel set mode to this connector.
 281          */
 282         drm_panel_attach(panel, connector);
 283         num = drm_panel_get_modes(panel);
 284         drm_panel_detach(panel);
 285         if (!num)
 286                 return 0;
 287
 288         if (IS_DUAL_DSI()) {
 289                 /* report half resolution to user */
 290                 dsi_dual_connector_fix_modes(connector);
 291                 ret = dsi_dual_connector_tile_init(connector, id);
 292                 if (ret)
 293                         return ret;
 294                 ret = drm_mode_connector_set_tile_property(connector);
 295                 if (ret) {
 296                         pr_err("%s: set tile property failed, %d\n",
 297                                         __func__, ret);
 298                         return ret;
 299                 }
 300         }
 301
 302         return num;
 303 }
 304
 305 static int dsi_mgr_connector_mode_valid(struct drm_connector *connector,
 306                                 struct drm_display_mode *mode)
 307 {
 308         int id = dsi_mgr_connector_get_id(connector);
 309         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 310         struct drm_encoder *encoder = msm_dsi_get_encoder(msm_dsi);
 311         struct msm_drm_private *priv = connector->dev->dev_private;
 312         struct msm_kms *kms = priv->kms;
 313         long actual, requested;
 314
 315         DBG("");
 316         requested = 1000 * mode->clock;
 317         actual = kms->funcs->round_pixclk(kms, requested, encoder);
 318
 319         DBG("requested=%ld, actual=%ld", requested, actual);
 320         if (actual != requested)
 321                 return MODE_CLOCK_RANGE;
 322
 323         return MODE_OK;
 324 }
 325
 326 static struct drm_encoder *
 327 dsi_mgr_connector_best_encoder(struct drm_connector *connector)
 328 {
 329         int id = dsi_mgr_connector_get_id(connector);
 330         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 331
 332         DBG("");
 333         return msm_dsi_get_encoder(msm_dsi);
 334 }
 335
 336 static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
 337 {
 338         int id = dsi_mgr_bridge_get_id(bridge);
 339         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 340         struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
 341         struct mipi_dsi_host *host = msm_dsi->host;
 342         struct drm_panel *panel = msm_dsi->panel;
 343         bool is_dual_dsi = IS_DUAL_DSI();
 344         int ret;
 345
 346         DBG("id=%d", id);
 347         if (!msm_dsi_device_connected(msm_dsi) ||
 348                         (is_dual_dsi && (DSI_1 == id)))
 349                 return;
 350
 351         ret = msm_dsi_host_power_on(host);
 352         if (ret) {
 353                 pr_err("%s: power on host %d failed, %d\n", __func__, id, ret);
 354                 goto host_on_fail;
 355         }
 356
 357         if (is_dual_dsi && msm_dsi1) {
 358                 ret = msm_dsi_host_power_on(msm_dsi1->host);
 359                 if (ret) {
 360                         pr_err("%s: power on host1 failed, %d\n",
 361                                                         __func__, ret);
 362                         goto host1_on_fail;
 363                 }
 364         }
 365
 366         /* Always call panel functions once, because even for dual panels,
 367          * there is only one drm_panel instance.
 368          */
 369         if (panel) {
 370                 ret = drm_panel_prepare(panel);
 371                 if (ret) {
 372                         pr_err("%s: prepare panel %d failed, %d\n", __func__,
 373                                                                 id, ret);
 374                         goto panel_prep_fail;
 375                 }
 376         }
 377
 378         ret = msm_dsi_host_enable(host);
 379         if (ret) {
 380                 pr_err("%s: enable host %d failed, %d\n", __func__, id, ret);
 381                 goto host_en_fail;
 382         }
 383
 384         if (is_dual_dsi && msm_dsi1) {
 385                 ret = msm_dsi_host_enable(msm_dsi1->host);
 386                 if (ret) {
 387                         pr_err("%s: enable host1 failed, %d\n", __func__, ret);
 388                         goto host1_en_fail;
 389                 }
 390         }
 391
 392         if (panel) {
 393                 ret = drm_panel_enable(panel);
 394                 if (ret) {
 395                         pr_err("%s: enable panel %d failed, %d\n", __func__, id,
 396                                                                         ret);
 397                         goto panel_en_fail;
 398                 }
 399         }
 400
 401         return;
 402
 403 panel_en_fail:
 404         if (is_dual_dsi && msm_dsi1)
 405                 msm_dsi_host_disable(msm_dsi1->host);
 406 host1_en_fail:
 407         msm_dsi_host_disable(host);
 408 host_en_fail:
 409         if (panel)
 410                 drm_panel_unprepare(panel);
 411 panel_prep_fail:
 412         if (is_dual_dsi && msm_dsi1)
 413                 msm_dsi_host_power_off(msm_dsi1->host);
 414 host1_on_fail:
 415         msm_dsi_host_power_off(host);
 416 host_on_fail:
 417         return;
 418 }
 419
 420 static void dsi_mgr_bridge_enable(struct drm_bridge *bridge)
 421 {
 422         DBG("");
 423 }
 424
 425 static void dsi_mgr_bridge_disable(struct drm_bridge *bridge)
 426 {
 427         DBG("");
 428 }
 429
 430 static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
 431 {
 432         int id = dsi_mgr_bridge_get_id(bridge);
 433         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 434         struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
 435         struct mipi_dsi_host *host = msm_dsi->host;
 436         struct drm_panel *panel = msm_dsi->panel;
 437         bool is_dual_dsi = IS_DUAL_DSI();
 438         int ret;
 439
 440         DBG("id=%d", id);
 441
 442         if (!msm_dsi_device_connected(msm_dsi) ||
 443                         (is_dual_dsi && (DSI_1 == id)))
 444                 return;
 445
 446         if (panel) {
 447                 ret = drm_panel_disable(panel);
 448                 if (ret)
 449                         pr_err("%s: Panel %d OFF failed, %d\n", __func__, id,
 450                                                                         ret);
 451         }
 452
 453         ret = msm_dsi_host_disable(host);
 454         if (ret)
 455                 pr_err("%s: host %d disable failed, %d\n", __func__, id, ret);
 456
 457         if (is_dual_dsi && msm_dsi1) {
 458                 ret = msm_dsi_host_disable(msm_dsi1->host);
 459                 if (ret)
 460                         pr_err("%s: host1 disable failed, %d\n", __func__, ret);
 461         }
 462
 463         if (panel) {
 464                 ret = drm_panel_unprepare(panel);
 465                 if (ret)
 466                         pr_err("%s: Panel %d unprepare failed,%d\n", __func__,
 467                                                                 id, ret);
 468         }
 469
 470         ret = msm_dsi_host_power_off(host);
 471         if (ret)
 472                 pr_err("%s: host %d power off failed,%d\n", __func__, id, ret);
 473
 474         if (is_dual_dsi && msm_dsi1) {
 475                 ret = msm_dsi_host_power_off(msm_dsi1->host);
 476                 if (ret)
 477                         pr_err("%s: host1 power off failed, %d\n",
 478                                                                 __func__, ret);
 479         }
 480 }
 481
 482 static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
 483                 struct drm_display_mode *mode,
 484                 struct drm_display_mode *adjusted_mode)
 485 {
 486         int id = dsi_mgr_bridge_get_id(bridge);
 487         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 488         struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
 489         struct mipi_dsi_host *host = msm_dsi->host;
 490         bool is_dual_dsi = IS_DUAL_DSI();
 491
 492         DBG("set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 493                         mode->base.id, mode->name,
 494                         mode->vrefresh, mode->clock,
 495                         mode->hdisplay, mode->hsync_start,
 496                         mode->hsync_end, mode->htotal,
 497                         mode->vdisplay, mode->vsync_start,
 498                         mode->vsync_end, mode->vtotal,
 499                         mode->type, mode->flags);
 500
 501         if (is_dual_dsi && (DSI_1 == id))
 502                 return;
 503
 504         msm_dsi_host_set_display_mode(host, adjusted_mode);
 505         if (is_dual_dsi && other_dsi)
 506                 msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode);
 507 }
 508
 509 static const struct drm_connector_funcs dsi_mgr_connector_funcs = {
 510         .dpms = drm_atomic_helper_connector_dpms,
 511         .detect = dsi_mgr_connector_detect,
 512         .fill_modes = drm_helper_probe_single_connector_modes,
 513         .destroy = dsi_mgr_connector_destroy,
 514         .reset = drm_atomic_helper_connector_reset,
 515         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 516         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 517 };
 518
 519 static const struct drm_connector_helper_funcs dsi_mgr_conn_helper_funcs = {
 520         .get_modes = dsi_mgr_connector_get_modes,
 521         .mode_valid = dsi_mgr_connector_mode_valid,
 522         .best_encoder = dsi_mgr_connector_best_encoder,
 523 };
 524
 525 static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
 526         .pre_enable = dsi_mgr_bridge_pre_enable,
 527         .enable = dsi_mgr_bridge_enable,
 528         .disable = dsi_mgr_bridge_disable,
 529         .post_disable = dsi_mgr_bridge_post_disable,
 530         .mode_set = dsi_mgr_bridge_mode_set,
 531 };
 532
 533 /* initialize connector when we're connected to a drm_panel */
 534 struct drm_connector *msm_dsi_manager_connector_init(u8 id)
 535 {
 536         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 537         struct drm_connector *connector = NULL;
 538         struct dsi_connector *dsi_connector;
 539         int ret, i;
 540
 541         dsi_connector = devm_kzalloc(msm_dsi->dev->dev,
 542                                 sizeof(*dsi_connector), GFP_KERNEL);
 543         if (!dsi_connector) {
 544                 ret = -ENOMEM;
 545                 goto fail;
 546         }
 547
 548         dsi_connector->id = id;
 549
 550         connector = &dsi_connector->base;
 551
 552         ret = drm_connector_init(msm_dsi->dev, connector,
 553                         &dsi_mgr_connector_funcs, DRM_MODE_CONNECTOR_DSI);
 554         if (ret)
 555                 goto fail;
 556
 557         drm_connector_helper_add(connector, &dsi_mgr_conn_helper_funcs);
 558
 559         /* Enable HPD to let hpd event is handled
 560          * when panel is attached to the host.
 561          */
 562         connector->polled = DRM_CONNECTOR_POLL_HPD;
 563
 564         /* Display driver doesn't support interlace now. */
 565         connector->interlace_allowed = 0;
 566         connector->doublescan_allowed = 0;
 567
 568         ret = drm_connector_register(connector);
 569         if (ret)
 570                 goto fail;
 571
 572         for (i = 0; i < MSM_DSI_ENCODER_NUM; i++)
 573                 drm_mode_connector_attach_encoder(connector,
 574                                                 msm_dsi->encoders[i]);
 575
 576         return connector;
 577
 578 fail:
 579         if (connector)
 580                 dsi_mgr_connector_destroy(connector);
 581
 582         return ERR_PTR(ret);
 583 }
 584
 585 /* initialize bridge */
 586 struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
 587 {
 588         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 589         struct drm_bridge *bridge = NULL;
 590         struct dsi_bridge *dsi_bridge;
 591         int ret;
 592
 593         dsi_bridge = devm_kzalloc(msm_dsi->dev->dev,
 594                                 sizeof(*dsi_bridge), GFP_KERNEL);
 595         if (!dsi_bridge) {
 596                 ret = -ENOMEM;
 597                 goto fail;
 598         }
 599
 600         dsi_bridge->id = id;
 601
 602         bridge = &dsi_bridge->base;
 603         bridge->funcs = &dsi_mgr_bridge_funcs;
 604
 605         ret = drm_bridge_attach(msm_dsi->dev, bridge);
 606         if (ret)
 607                 goto fail;
 608
 609         return bridge;
 610
 611 fail:
 612         if (bridge)
 613                 msm_dsi_manager_bridge_destroy(bridge);
 614
 615         return ERR_PTR(ret);
 616 }
 617
 618 struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
 619 {
 620         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 621         struct drm_device *dev = msm_dsi->dev;
 622         struct drm_encoder *encoder;
 623         struct drm_bridge *int_bridge, *ext_bridge;
 624         struct drm_connector *connector;
 625         struct list_head *connector_list;
 626
 627         int_bridge = msm_dsi->bridge;
 628         ext_bridge = msm_dsi->external_bridge =
 629                         msm_dsi_host_get_bridge(msm_dsi->host);
 630
 631         /*
 632          * HACK: we may not know the external DSI bridge device's mode
 633          * flags here. We'll get to know them only when the device
 634          * attaches to the dsi host. For now, assume the bridge supports
 635          * DSI video mode
 636          */
 637         encoder = msm_dsi->encoders[MSM_DSI_VIDEO_ENCODER_ID];
 638
 639         /* link the internal dsi bridge to the external bridge */
 640         int_bridge->next = ext_bridge;
 641         /* set the external bridge's encoder as dsi's encoder */
 642         ext_bridge->encoder = encoder;
 643
 644         drm_bridge_attach(dev, ext_bridge);
 645
 646         /*
 647          * we need the drm_connector created by the external bridge
 648          * driver (or someone else) to feed it to our driver's
 649          * priv->connector[] list, mainly for msm_fbdev_init()
 650          */
 651         connector_list = &dev->mode_config.connector_list;
 652
 653         list_for_each_entry(connector, connector_list, head) {
 654                 int i;
 655
 656                 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
 657                         if (connector->encoder_ids[i] == encoder->base.id)
 658                                 return connector;
 659                 }
 660         }
 661
 662         return ERR_PTR(-ENODEV);
 663 }
 664
 665 void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
 666 {
 667 }
 668
 669 int msm_dsi_manager_phy_enable(int id,
 670                 const unsigned long bit_rate, const unsigned long esc_rate,
 671                 u32 *clk_pre, u32 *clk_post)
 672 {
 673         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 674         struct msm_dsi_phy *phy = msm_dsi->phy;
 675         int src_pll_id = IS_DUAL_DSI() ? DSI_CLOCK_MASTER : id;
 676         struct msm_dsi_pll *pll = msm_dsi_phy_get_pll(msm_dsi->phy);
 677         int ret;
 678
 679         ret = msm_dsi_phy_enable(phy, src_pll_id, bit_rate, esc_rate);
 680         if (ret)
 681                 return ret;
 682
 683         /*
 684          * Reset DSI PHY silently changes its PLL registers to reset status,
 685          * which will confuse clock driver and result in wrong output rate of
 686          * link clocks. Restore PLL status if its PLL is being used as clock
 687          * source.
 688          */
 689         if (!IS_DUAL_DSI() || (id == DSI_CLOCK_MASTER)) {
 690                 ret = msm_dsi_pll_restore_state(pll);
 691                 if (ret) {
 692                         pr_err("%s: failed to restore pll state\n", __func__);
 693                         msm_dsi_phy_disable(phy);
 694                         return ret;
 695                 }
 696         }
 697
 698         msm_dsi->phy_enabled = true;
 699         msm_dsi_phy_get_clk_pre_post(phy, clk_pre, clk_post);
 700
 701         return 0;
 702 }
 703
 704 void msm_dsi_manager_phy_disable(int id)
 705 {
 706         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 707         struct msm_dsi *mdsi = dsi_mgr_get_dsi(DSI_CLOCK_MASTER);
 708         struct msm_dsi *sdsi = dsi_mgr_get_dsi(DSI_CLOCK_SLAVE);
 709         struct msm_dsi_phy *phy = msm_dsi->phy;
 710         struct msm_dsi_pll *pll = msm_dsi_phy_get_pll(msm_dsi->phy);
 711
 712         /* Save PLL status if it is a clock source */
 713         if (!IS_DUAL_DSI() || (id == DSI_CLOCK_MASTER))
 714                 msm_dsi_pll_save_state(pll);
 715
 716         /* disable DSI phy
 717          * In dual-dsi configuration, the phy should be disabled for the
 718          * first controller only when the second controller is disabled.
 719          */
 720         msm_dsi->phy_enabled = false;
 721         if (IS_DUAL_DSI() && mdsi && sdsi) {
 722                 if (!mdsi->phy_enabled && !sdsi->phy_enabled) {
 723                         msm_dsi_phy_disable(sdsi->phy);
 724                         msm_dsi_phy_disable(mdsi->phy);
 725                 }
 726         } else {
 727                 msm_dsi_phy_disable(phy);
 728         }
 729 }
 730
 731 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg)
 732 {
 733         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 734         struct msm_dsi *msm_dsi0 = dsi_mgr_get_dsi(DSI_0);
 735         struct mipi_dsi_host *host = msm_dsi->host;
 736         bool is_read = (msg->rx_buf && msg->rx_len);
 737         bool need_sync = (IS_SYNC_NEEDED() && !is_read);
 738         int ret;
 739
 740         if (!msg->tx_buf || !msg->tx_len)
 741                 return 0;
 742
 743         /* In dual master case, panel requires the same commands sent to
 744          * both DSI links. Host issues the command trigger to both links
 745          * when DSI_1 calls the cmd transfer function, no matter it happens
 746          * before or after DSI_0 cmd transfer.
 747          */
 748         if (need_sync && (id == DSI_0))
 749                 return is_read ? msg->rx_len : msg->tx_len;
 750
 751         if (need_sync && msm_dsi0) {
 752                 ret = msm_dsi_host_xfer_prepare(msm_dsi0->host, msg);
 753                 if (ret) {
 754                         pr_err("%s: failed to prepare non-trigger host, %d\n",
 755                                 __func__, ret);
 756                         return ret;
 757                 }
 758         }
 759         ret = msm_dsi_host_xfer_prepare(host, msg);
 760         if (ret) {
 761                 pr_err("%s: failed to prepare host, %d\n", __func__, ret);
 762                 goto restore_host0;
 763         }
 764
 765         ret = is_read ? msm_dsi_host_cmd_rx(host, msg) :
 766                         msm_dsi_host_cmd_tx(host, msg);
 767
 768         msm_dsi_host_xfer_restore(host, msg);
 769
 770 restore_host0:
 771         if (need_sync && msm_dsi0)
 772                 msm_dsi_host_xfer_restore(msm_dsi0->host, msg);
 773
 774         return ret;
 775 }
 776
 777 bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 iova, u32 len)
 778 {
 779         struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 780         struct msm_dsi *msm_dsi0 = dsi_mgr_get_dsi(DSI_0);
 781         struct mipi_dsi_host *host = msm_dsi->host;
 782
 783         if (IS_SYNC_NEEDED() && (id == DSI_0))
 784                 return false;
 785
 786         if (IS_SYNC_NEEDED() && msm_dsi0)
 787                 msm_dsi_host_cmd_xfer_commit(msm_dsi0->host, iova, len);
 788
 789         msm_dsi_host_cmd_xfer_commit(host, iova, len);
 790
 791         return true;
 792 }
 793
 794 int msm_dsi_manager_register(struct msm_dsi *msm_dsi)
 795 {
 796         struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
 797         int id = msm_dsi->id;
 798         int ret;
 799
 800         if (id > DSI_MAX) {
 801                 pr_err("%s: invalid id %d\n", __func__, id);
 802                 return -EINVAL;
 803         }
 804
 805         if (msm_dsim->dsi[id]) {
 806                 pr_err("%s: dsi%d already registered\n", __func__, id);
 807                 return -EBUSY;
 808         }
 809
 810         msm_dsim->dsi[id] = msm_dsi;
 811
 812         ret = dsi_mgr_parse_dual_dsi(msm_dsi->pdev->dev.of_node, id);
 813         if (ret) {
 814                 pr_err("%s: failed to parse dual DSI info\n", __func__);
 815                 goto fail;
 816         }
 817
 818         ret = dsi_mgr_host_register(id);
 819         if (ret) {
 820                 pr_err("%s: failed to register mipi dsi host for DSI %d\n",
 821                         __func__, id);
 822                 goto fail;
 823         }
 824
 825         return 0;
 826
 827 fail:
 828         msm_dsim->dsi[id] = NULL;
 829         return ret;
 830 }
 831
 832 void msm_dsi_manager_unregister(struct msm_dsi *msm_dsi)
 833 {
 834         struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
 835
 836         if (msm_dsi->host)
 837                 msm_dsi_host_unregister(msm_dsi->host);
 838         msm_dsim->dsi[msm_dsi->id] = NULL;
 839 }
 840