drivers/gpu/drm/mediatek/mtk_drm_crtc.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   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 as
   6  * 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 <asm/barrier.h>
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_plane_helper.h>
  19 #include <linux/clk.h>
  20 #include <linux/pm_runtime.h>
  21 #include <soc/mediatek/smi.h>
  22
  23 #include "mtk_drm_drv.h"
  24 #include "mtk_drm_crtc.h"
  25 #include "mtk_drm_ddp.h"
  26 #include "mtk_drm_ddp_comp.h"
  27 #include "mtk_drm_gem.h"
  28 #include "mtk_drm_plane.h"
  29
  30 /**
  31  * struct mtk_drm_crtc - MediaTek specific crtc structure.
  32  * @base: crtc object.
  33  * @enabled: records whether crtc_enable succeeded
  34  * @planes: array of 4 drm_plane structures, one for each overlay plane
  35  * @pending_planes: whether any plane has pending changes to be applied
  36  * @config_regs: memory mapped mmsys configuration register space
  37  * @mutex: handle to one of the ten disp_mutex streams
  38  * @ddp_comp_nr: number of components in ddp_comp
  39  * @ddp_comp: array of pointers the mtk_ddp_comp structures used by this crtc
  40  */
  41 struct mtk_drm_crtc {
  42         struct drm_crtc                 base;
  43         bool                            enabled;
  44
  45         bool                            pending_needs_vblank;
  46         struct drm_pending_vblank_event *event;
  47
  48         struct drm_plane                *planes;
  49         unsigned int                    layer_nr;
  50         bool                            pending_planes;
  51
  52         void __iomem                    *config_regs;
  53         struct mtk_disp_mutex           *mutex;
  54         unsigned int                    ddp_comp_nr;
  55         struct mtk_ddp_comp             **ddp_comp;
  56 };
  57
  58 struct mtk_crtc_state {
  59         struct drm_crtc_state           base;
  60
  61         bool                            pending_config;
  62         unsigned int                    pending_width;
  63         unsigned int                    pending_height;
  64         unsigned int                    pending_vrefresh;
  65 };
  66
  67 static inline struct mtk_drm_crtc *to_mtk_crtc(struct drm_crtc *c)
  68 {
  69         return container_of(c, struct mtk_drm_crtc, base);
  70 }
  71
  72 static inline struct mtk_crtc_state *to_mtk_crtc_state(struct drm_crtc_state *s)
  73 {
  74         return container_of(s, struct mtk_crtc_state, base);
  75 }
  76
  77 static void mtk_drm_crtc_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
  78 {
  79         struct drm_crtc *crtc = &mtk_crtc->base;
  80         unsigned long flags;
  81
  82         spin_lock_irqsave(&crtc->dev->event_lock, flags);
  83         drm_crtc_send_vblank_event(crtc, mtk_crtc->event);
  84         drm_crtc_vblank_put(crtc);
  85         mtk_crtc->event = NULL;
  86         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
  87 }
  88
  89 static void mtk_drm_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
  90 {
  91         drm_crtc_handle_vblank(&mtk_crtc->base);
  92         if (mtk_crtc->pending_needs_vblank) {
  93                 mtk_drm_crtc_finish_page_flip(mtk_crtc);
  94                 mtk_crtc->pending_needs_vblank = false;
  95         }
  96 }
  97
  98 static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
  99 {
 100         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 101         int i;
 102
 103         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
 104                 clk_unprepare(mtk_crtc->ddp_comp[i]->clk);
 105
 106         mtk_disp_mutex_put(mtk_crtc->mutex);
 107
 108         drm_crtc_cleanup(crtc);
 109 }
 110
 111 static void mtk_drm_crtc_reset(struct drm_crtc *crtc)
 112 {
 113         struct mtk_crtc_state *state;
 114
 115         if (crtc->state) {
 116                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
 117
 118                 state = to_mtk_crtc_state(crtc->state);
 119                 memset(state, 0, sizeof(*state));
 120         } else {
 121                 state = kzalloc(sizeof(*state), GFP_KERNEL);
 122                 if (!state)
 123                         return;
 124                 crtc->state = &state->base;
 125         }
 126
 127         state->base.crtc = crtc;
 128 }
 129
 130 static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc)
 131 {
 132         struct mtk_crtc_state *state;
 133
 134         state = kzalloc(sizeof(*state), GFP_KERNEL);
 135         if (!state)
 136                 return NULL;
 137
 138         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 139
 140         WARN_ON(state->base.crtc != crtc);
 141         state->base.crtc = crtc;
 142
 143         return &state->base;
 144 }
 145
 146 static void mtk_drm_crtc_destroy_state(struct drm_crtc *crtc,
 147                                        struct drm_crtc_state *state)
 148 {
 149         __drm_atomic_helper_crtc_destroy_state(state);
 150         kfree(to_mtk_crtc_state(state));
 151 }
 152
 153 static bool mtk_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 154                                     const struct drm_display_mode *mode,
 155                                     struct drm_display_mode *adjusted_mode)
 156 {
 157         /* Nothing to do here, but this callback is mandatory. */
 158         return true;
 159 }
 160
 161 static void mtk_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
 162 {
 163         struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
 164
 165         state->pending_width = crtc->mode.hdisplay;
 166         state->pending_height = crtc->mode.vdisplay;
 167         state->pending_vrefresh = crtc->mode.vrefresh;
 168         wmb();  /* Make sure the above parameters are set before update */
 169         state->pending_config = true;
 170 }
 171
 172 static int mtk_drm_crtc_enable_vblank(struct drm_crtc *crtc)
 173 {
 174         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 175         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
 176
 177         mtk_ddp_comp_enable_vblank(comp, &mtk_crtc->base);
 178
 179         return 0;
 180 }
 181
 182 static void mtk_drm_crtc_disable_vblank(struct drm_crtc *crtc)
 183 {
 184         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 185         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
 186
 187         mtk_ddp_comp_disable_vblank(comp);
 188 }
 189
 190 static int mtk_crtc_ddp_clk_enable(struct mtk_drm_crtc *mtk_crtc)
 191 {
 192         int ret;
 193         int i;
 194
 195         DRM_DEBUG_DRIVER("%s\n", __func__);
 196         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
 197                 ret = clk_enable(mtk_crtc->ddp_comp[i]->clk);
 198                 if (ret) {
 199                         DRM_ERROR("Failed to enable clock %d: %d\n", i, ret);
 200                         goto err;
 201                 }
 202         }
 203
 204         return 0;
 205 err:
 206         while (--i >= 0)
 207                 clk_disable(mtk_crtc->ddp_comp[i]->clk);
 208         return ret;
 209 }
 210
 211 static void mtk_crtc_ddp_clk_disable(struct mtk_drm_crtc *mtk_crtc)
 212 {
 213         int i;
 214
 215         DRM_DEBUG_DRIVER("%s\n", __func__);
 216         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
 217                 clk_disable(mtk_crtc->ddp_comp[i]->clk);
 218 }
 219
 220 static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 221 {
 222         struct drm_crtc *crtc = &mtk_crtc->base;
 223         struct drm_connector *connector;
 224         struct drm_encoder *encoder;
 225         struct drm_connector_list_iter conn_iter;
 226         unsigned int width, height, vrefresh, bpc = MTK_MAX_BPC;
 227         int ret;
 228         int i;
 229
 230         DRM_DEBUG_DRIVER("%s\n", __func__);
 231         if (WARN_ON(!crtc->state))
 232                 return -EINVAL;
 233
 234         width = crtc->state->adjusted_mode.hdisplay;
 235         height = crtc->state->adjusted_mode.vdisplay;
 236         vrefresh = crtc->state->adjusted_mode.vrefresh;
 237
 238         drm_for_each_encoder(encoder, crtc->dev) {
 239                 if (encoder->crtc != crtc)
 240                         continue;
 241
 242                 drm_connector_list_iter_begin(crtc->dev, &conn_iter);
 243                 drm_for_each_connector_iter(connector, &conn_iter) {
 244                         if (connector->encoder != encoder)
 245                                 continue;
 246                         if (connector->display_info.bpc != 0 &&
 247                             bpc > connector->display_info.bpc)
 248                                 bpc = connector->display_info.bpc;
 249                 }
 250                 drm_connector_list_iter_end(&conn_iter);
 251         }
 252
 253         ret = pm_runtime_get_sync(crtc->dev->dev);
 254         if (ret < 0) {
 255                 DRM_ERROR("Failed to enable power domain: %d\n", ret);
 256                 return ret;
 257         }
 258
 259         ret = mtk_disp_mutex_prepare(mtk_crtc->mutex);
 260         if (ret < 0) {
 261                 DRM_ERROR("Failed to enable mutex clock: %d\n", ret);
 262                 goto err_pm_runtime_put;
 263         }
 264
 265         ret = mtk_crtc_ddp_clk_enable(mtk_crtc);
 266         if (ret < 0) {
 267                 DRM_ERROR("Failed to enable component clocks: %d\n", ret);
 268                 goto err_mutex_unprepare;
 269         }
 270
 271         DRM_DEBUG_DRIVER("mediatek_ddp_ddp_path_setup\n");
 272         for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
 273                 mtk_ddp_add_comp_to_path(mtk_crtc->config_regs,
 274                                          mtk_crtc->ddp_comp[i]->id,
 275                                          mtk_crtc->ddp_comp[i + 1]->id);
 276                 mtk_disp_mutex_add_comp(mtk_crtc->mutex,
 277                                         mtk_crtc->ddp_comp[i]->id);
 278         }
 279         mtk_disp_mutex_add_comp(mtk_crtc->mutex, mtk_crtc->ddp_comp[i]->id);
 280         mtk_disp_mutex_enable(mtk_crtc->mutex);
 281
 282         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
 283                 struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[i];
 284
 285                 mtk_ddp_comp_config(comp, width, height, vrefresh, bpc);
 286                 mtk_ddp_comp_start(comp);
 287         }
 288
 289         /* Initially configure all planes */
 290         for (i = 0; i < mtk_crtc->layer_nr; i++) {
 291                 struct drm_plane *plane = &mtk_crtc->planes[i];
 292                 struct mtk_plane_state *plane_state;
 293
 294                 plane_state = to_mtk_plane_state(plane->state);
 295                 mtk_ddp_comp_layer_config(mtk_crtc->ddp_comp[0], i,
 296                                           plane_state);
 297         }
 298
 299         return 0;
 300
 301 err_mutex_unprepare:
 302         mtk_disp_mutex_unprepare(mtk_crtc->mutex);
 303 err_pm_runtime_put:
 304         pm_runtime_put(crtc->dev->dev);
 305         return ret;
 306 }
 307
 308 static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
 309 {
 310         struct drm_device *drm = mtk_crtc->base.dev;
 311         int i;
 312
 313         DRM_DEBUG_DRIVER("%s\n", __func__);
 314         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
 315                 mtk_ddp_comp_stop(mtk_crtc->ddp_comp[i]);
 316         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
 317                 mtk_disp_mutex_remove_comp(mtk_crtc->mutex,
 318                                            mtk_crtc->ddp_comp[i]->id);
 319         mtk_disp_mutex_disable(mtk_crtc->mutex);
 320         for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
 321                 mtk_ddp_remove_comp_from_path(mtk_crtc->config_regs,
 322                                               mtk_crtc->ddp_comp[i]->id,
 323                                               mtk_crtc->ddp_comp[i + 1]->id);
 324                 mtk_disp_mutex_remove_comp(mtk_crtc->mutex,
 325                                            mtk_crtc->ddp_comp[i]->id);
 326         }
 327         mtk_disp_mutex_remove_comp(mtk_crtc->mutex, mtk_crtc->ddp_comp[i]->id);
 328         mtk_crtc_ddp_clk_disable(mtk_crtc);
 329         mtk_disp_mutex_unprepare(mtk_crtc->mutex);
 330
 331         pm_runtime_put(drm->dev);
 332 }
 333
 334 static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
 335 {
 336         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 337         struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state);
 338         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
 339         unsigned int i;
 340
 341         /*
 342          * TODO: instead of updating the registers here, we should prepare
 343          * working registers in atomic_commit and let the hardware command
 344          * queue update module registers on vblank.
 345          */
 346         if (state->pending_config) {
 347                 mtk_ddp_comp_config(comp, state->pending_width,
 348                                     state->pending_height,
 349                                     state->pending_vrefresh, 0);
 350
 351                 state->pending_config = false;
 352         }
 353
 354         if (mtk_crtc->pending_planes) {
 355                 for (i = 0; i < mtk_crtc->layer_nr; i++) {
 356                         struct drm_plane *plane = &mtk_crtc->planes[i];
 357                         struct mtk_plane_state *plane_state;
 358
 359                         plane_state = to_mtk_plane_state(plane->state);
 360
 361                         if (plane_state->pending.config) {
 362                                 mtk_ddp_comp_layer_config(comp, i, plane_state);
 363                                 plane_state->pending.config = false;
 364                         }
 365                 }
 366                 mtk_crtc->pending_planes = false;
 367         }
 368 }
 369
 370 static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
 371                                        struct drm_crtc_state *old_state)
 372 {
 373         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 374         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
 375         int ret;
 376
 377         DRM_DEBUG_DRIVER("%s %d\n", __func__, crtc->base.id);
 378
 379         ret = mtk_smi_larb_get(comp->larb_dev);
 380         if (ret) {
 381                 DRM_ERROR("Failed to get larb: %d\n", ret);
 382                 return;
 383         }
 384
 385         ret = mtk_crtc_ddp_hw_init(mtk_crtc);
 386         if (ret) {
 387                 mtk_smi_larb_put(comp->larb_dev);
 388                 return;
 389         }
 390
 391         drm_crtc_vblank_on(crtc);
 392         mtk_crtc->enabled = true;
 393 }
 394
 395 static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 396                                         struct drm_crtc_state *old_state)
 397 {
 398         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 399         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
 400         int i;
 401
 402         DRM_DEBUG_DRIVER("%s %d\n", __func__, crtc->base.id);
 403         if (!mtk_crtc->enabled)
 404                 return;
 405
 406         /* Set all pending plane state to disabled */
 407         for (i = 0; i < mtk_crtc->layer_nr; i++) {
 408                 struct drm_plane *plane = &mtk_crtc->planes[i];
 409                 struct mtk_plane_state *plane_state;
 410
 411                 plane_state = to_mtk_plane_state(plane->state);
 412                 plane_state->pending.enable = false;
 413                 plane_state->pending.config = true;
 414         }
 415         mtk_crtc->pending_planes = true;
 416
 417         /* Wait for planes to be disabled */
 418         drm_crtc_wait_one_vblank(crtc);
 419
 420         drm_crtc_vblank_off(crtc);
 421         mtk_crtc_ddp_hw_fini(mtk_crtc);
 422         mtk_smi_larb_put(comp->larb_dev);
 423
 424         mtk_crtc->enabled = false;
 425 }
 426
 427 static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 428                                       struct drm_crtc_state *old_crtc_state)
 429 {
 430         struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
 431         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 432
 433         if (mtk_crtc->event && state->base.event)
 434                 DRM_ERROR("new event while there is still a pending event\n");
 435
 436         if (state->base.event) {
 437                 state->base.event->pipe = drm_crtc_index(crtc);
 438                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 439                 mtk_crtc->event = state->base.event;
 440                 state->base.event = NULL;
 441         }
 442 }
 443
 444 static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 445                                       struct drm_crtc_state *old_crtc_state)
 446 {
 447         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 448         struct mtk_drm_private *priv = crtc->dev->dev_private;
 449         unsigned int pending_planes = 0;
 450         int i;
 451
 452         if (mtk_crtc->event)
 453                 mtk_crtc->pending_needs_vblank = true;
 454         for (i = 0; i < mtk_crtc->layer_nr; i++) {
 455                 struct drm_plane *plane = &mtk_crtc->planes[i];
 456                 struct mtk_plane_state *plane_state;
 457
 458                 plane_state = to_mtk_plane_state(plane->state);
 459                 if (plane_state->pending.dirty) {
 460                         plane_state->pending.config = true;
 461                         plane_state->pending.dirty = false;
 462                         pending_planes |= BIT(i);
 463                 }
 464         }
 465         if (pending_planes)
 466                 mtk_crtc->pending_planes = true;
 467         if (crtc->state->color_mgmt_changed)
 468                 for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
 469                         mtk_ddp_gamma_set(mtk_crtc->ddp_comp[i], crtc->state);
 470
 471         if (priv->data->shadow_register) {
 472                 mtk_disp_mutex_acquire(mtk_crtc->mutex);
 473                 mtk_crtc_ddp_config(crtc);
 474                 mtk_disp_mutex_release(mtk_crtc->mutex);
 475         }
 476 }
 477
 478 static const struct drm_crtc_funcs mtk_crtc_funcs = {
 479         .set_config             = drm_atomic_helper_set_config,
 480         .page_flip              = drm_atomic_helper_page_flip,
 481         .destroy                = mtk_drm_crtc_destroy,
 482         .reset                  = mtk_drm_crtc_reset,
 483         .atomic_duplicate_state = mtk_drm_crtc_duplicate_state,
 484         .atomic_destroy_state   = mtk_drm_crtc_destroy_state,
 485         .gamma_set              = drm_atomic_helper_legacy_gamma_set,
 486         .enable_vblank          = mtk_drm_crtc_enable_vblank,
 487         .disable_vblank         = mtk_drm_crtc_disable_vblank,
 488 };
 489
 490 static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = {
 491         .mode_fixup     = mtk_drm_crtc_mode_fixup,
 492         .mode_set_nofb  = mtk_drm_crtc_mode_set_nofb,
 493         .atomic_begin   = mtk_drm_crtc_atomic_begin,
 494         .atomic_flush   = mtk_drm_crtc_atomic_flush,
 495         .atomic_enable  = mtk_drm_crtc_atomic_enable,
 496         .atomic_disable = mtk_drm_crtc_atomic_disable,
 497 };
 498
 499 static int mtk_drm_crtc_init(struct drm_device *drm,
 500                              struct mtk_drm_crtc *mtk_crtc,
 501                              struct drm_plane *primary,
 502                              struct drm_plane *cursor, unsigned int pipe)
 503 {
 504         int ret;
 505
 506         ret = drm_crtc_init_with_planes(drm, &mtk_crtc->base, primary, cursor,
 507                                         &mtk_crtc_funcs, NULL);
 508         if (ret)
 509                 goto err_cleanup_crtc;
 510
 511         drm_crtc_helper_add(&mtk_crtc->base, &mtk_crtc_helper_funcs);
 512
 513         return 0;
 514
 515 err_cleanup_crtc:
 516         drm_crtc_cleanup(&mtk_crtc->base);
 517         return ret;
 518 }
 519
 520 void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *comp)
 521 {
 522         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 523         struct mtk_drm_private *priv = crtc->dev->dev_private;
 524
 525         if (!priv->data->shadow_register)
 526                 mtk_crtc_ddp_config(crtc);
 527
 528         mtk_drm_finish_page_flip(mtk_crtc);
 529 }
 530
 531 int mtk_drm_crtc_create(struct drm_device *drm_dev,
 532                         const enum mtk_ddp_comp_id *path, unsigned int path_len)
 533 {
 534         struct mtk_drm_private *priv = drm_dev->dev_private;
 535         struct device *dev = drm_dev->dev;
 536         struct mtk_drm_crtc *mtk_crtc;
 537         enum drm_plane_type type;
 538         unsigned int zpos;
 539         int pipe = priv->num_pipes;
 540         int ret;
 541         int i;
 542
 543         if (!path)
 544                 return 0;
 545
 546         for (i = 0; i < path_len; i++) {
 547                 enum mtk_ddp_comp_id comp_id = path[i];
 548                 struct device_node *node;
 549
 550                 node = priv->comp_node[comp_id];
 551                 if (!node) {
 552                         dev_info(dev,
 553                                  "Not creating crtc %d because component %d is disabled or missing\n",
 554                                  pipe, comp_id);
 555                         return 0;
 556                 }
 557         }
 558
 559         mtk_crtc = devm_kzalloc(dev, sizeof(*mtk_crtc), GFP_KERNEL);
 560         if (!mtk_crtc)
 561                 return -ENOMEM;
 562
 563         mtk_crtc->config_regs = priv->config_regs;
 564         mtk_crtc->ddp_comp_nr = path_len;
 565         mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
 566                                                 sizeof(*mtk_crtc->ddp_comp),
 567                                                 GFP_KERNEL);
 568         if (!mtk_crtc->ddp_comp)
 569                 return -ENOMEM;
 570
 571         mtk_crtc->mutex = mtk_disp_mutex_get(priv->mutex_dev, pipe);
 572         if (IS_ERR(mtk_crtc->mutex)) {
 573                 ret = PTR_ERR(mtk_crtc->mutex);
 574                 dev_err(dev, "Failed to get mutex: %d\n", ret);
 575                 return ret;
 576         }
 577
 578         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
 579                 enum mtk_ddp_comp_id comp_id = path[i];
 580                 struct mtk_ddp_comp *comp;
 581                 struct device_node *node;
 582
 583                 node = priv->comp_node[comp_id];
 584                 comp = priv->ddp_comp[comp_id];
 585                 if (!comp) {
 586                         dev_err(dev, "Component %pOF not initialized\n", node);
 587                         ret = -ENODEV;
 588                         goto unprepare;
 589                 }
 590
 591                 ret = clk_prepare(comp->clk);
 592                 if (ret) {
 593                         dev_err(dev,
 594                                 "Failed to prepare clock for component %pOF: %d\n",
 595                                 node, ret);
 596                         goto unprepare;
 597                 }
 598
 599                 mtk_crtc->ddp_comp[i] = comp;
 600         }
 601
 602         mtk_crtc->layer_nr = mtk_ddp_comp_layer_nr(mtk_crtc->ddp_comp[0]);
 603         mtk_crtc->planes = devm_kcalloc(dev, mtk_crtc->layer_nr,
 604                                         sizeof(struct drm_plane),
 605                                         GFP_KERNEL);
 606
 607         for (zpos = 0; zpos < mtk_crtc->layer_nr; zpos++) {
 608                 type = (zpos == 0) ? DRM_PLANE_TYPE_PRIMARY :
 609                                 (zpos == 1) ? DRM_PLANE_TYPE_CURSOR :
 610                                                 DRM_PLANE_TYPE_OVERLAY;
 611                 ret = mtk_plane_init(drm_dev, &mtk_crtc->planes[zpos],
 612                                      BIT(pipe), type);
 613                 if (ret)
 614                         goto unprepare;
 615         }
 616
 617         ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
 618                                 mtk_crtc->layer_nr > 1 ? &mtk_crtc->planes[1] :
 619                                 NULL, pipe);
 620         if (ret < 0)
 621                 goto unprepare;
 622         drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
 623         drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, MTK_LUT_SIZE);
 624         priv->num_pipes++;
 625
 626         return 0;
 627
 628 unprepare:
 629         while (--i >= 0)
 630                 clk_unprepare(mtk_crtc->ddp_comp[i]->clk);
 631
 632         return ret;
 633 }