drivers/gpu/drm/rcar-du/rcar_du_crtc.c

   1 /*
   2  * rcar_du_crtc.c  --  R-Car Display Unit CRTCs
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/mutex.h>
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_atomic.h>
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_crtc.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_gem_cma_helper.h>
  24 #include <drm/drm_plane_helper.h>
  25
  26 #include "rcar_du_crtc.h"
  27 #include "rcar_du_drv.h"
  28 #include "rcar_du_kms.h"
  29 #include "rcar_du_plane.h"
  30 #include "rcar_du_regs.h"
  31
  32 static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
  33 {
  34         struct rcar_du_device *rcdu = rcrtc->group->dev;
  35
  36         return rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
  37 }
  38
  39 static void rcar_du_crtc_write(struct rcar_du_crtc *rcrtc, u32 reg, u32 data)
  40 {
  41         struct rcar_du_device *rcdu = rcrtc->group->dev;
  42
  43         rcar_du_write(rcdu, rcrtc->mmio_offset + reg, data);
  44 }
  45
  46 static void rcar_du_crtc_clr(struct rcar_du_crtc *rcrtc, u32 reg, u32 clr)
  47 {
  48         struct rcar_du_device *rcdu = rcrtc->group->dev;
  49
  50         rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
  51                       rcar_du_read(rcdu, rcrtc->mmio_offset + reg) & ~clr);
  52 }
  53
  54 static void rcar_du_crtc_set(struct rcar_du_crtc *rcrtc, u32 reg, u32 set)
  55 {
  56         struct rcar_du_device *rcdu = rcrtc->group->dev;
  57
  58         rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
  59                       rcar_du_read(rcdu, rcrtc->mmio_offset + reg) | set);
  60 }
  61
  62 static void rcar_du_crtc_clr_set(struct rcar_du_crtc *rcrtc, u32 reg,
  63                                  u32 clr, u32 set)
  64 {
  65         struct rcar_du_device *rcdu = rcrtc->group->dev;
  66         u32 value = rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
  67
  68         rcar_du_write(rcdu, rcrtc->mmio_offset + reg, (value & ~clr) | set);
  69 }
  70
  71 static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
  72 {
  73         int ret;
  74
  75         ret = clk_prepare_enable(rcrtc->clock);
  76         if (ret < 0)
  77                 return ret;
  78
  79         ret = clk_prepare_enable(rcrtc->extclock);
  80         if (ret < 0)
  81                 goto error_clock;
  82
  83         ret = rcar_du_group_get(rcrtc->group);
  84         if (ret < 0)
  85                 goto error_group;
  86
  87         return 0;
  88
  89 error_group:
  90         clk_disable_unprepare(rcrtc->extclock);
  91 error_clock:
  92         clk_disable_unprepare(rcrtc->clock);
  93         return ret;
  94 }
  95
  96 static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
  97 {
  98         rcar_du_group_put(rcrtc->group);
  99
 100         clk_disable_unprepare(rcrtc->extclock);
 101         clk_disable_unprepare(rcrtc->clock);
 102 }
 103
 104 /* -----------------------------------------------------------------------------
 105  * Hardware Setup
 106  */
 107
 108 static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 109 {
 110         const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
 111         unsigned long mode_clock = mode->clock * 1000;
 112         unsigned long clk;
 113         u32 value;
 114         u32 escr;
 115         u32 div;
 116
 117         /* Compute the clock divisor and select the internal or external dot
 118          * clock based on the requested frequency.
 119          */
 120         clk = clk_get_rate(rcrtc->clock);
 121         div = DIV_ROUND_CLOSEST(clk, mode_clock);
 122         div = clamp(div, 1U, 64U) - 1;
 123         escr = div | ESCR_DCLKSEL_CLKS;
 124
 125         if (rcrtc->extclock) {
 126                 unsigned long extclk;
 127                 unsigned long extrate;
 128                 unsigned long rate;
 129                 u32 extdiv;
 130
 131                 extclk = clk_get_rate(rcrtc->extclock);
 132                 extdiv = DIV_ROUND_CLOSEST(extclk, mode_clock);
 133                 extdiv = clamp(extdiv, 1U, 64U) - 1;
 134
 135                 rate = clk / (div + 1);
 136                 extrate = extclk / (extdiv + 1);
 137
 138                 if (abs((long)extrate - (long)mode_clock) <
 139                     abs((long)rate - (long)mode_clock)) {
 140                         dev_dbg(rcrtc->group->dev->dev,
 141                                 "crtc%u: using external clock\n", rcrtc->index);
 142                         escr = extdiv | ESCR_DCLKSEL_DCLKIN;
 143                 }
 144         }
 145
 146         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? ESCR2 : ESCR,
 147                             escr);
 148         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? OTAR2 : OTAR, 0);
 149
 150         /* Signal polarities */
 151         value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : DSMR_VSL)
 152               | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : DSMR_HSL)
 153               | DSMR_DIPM_DE | DSMR_CSPM;
 154         rcar_du_crtc_write(rcrtc, DSMR, value);
 155
 156         /* Display timings */
 157         rcar_du_crtc_write(rcrtc, HDSR, mode->htotal - mode->hsync_start - 19);
 158         rcar_du_crtc_write(rcrtc, HDER, mode->htotal - mode->hsync_start +
 159                                         mode->hdisplay - 19);
 160         rcar_du_crtc_write(rcrtc, HSWR, mode->hsync_end -
 161                                         mode->hsync_start - 1);
 162         rcar_du_crtc_write(rcrtc, HCR,  mode->htotal - 1);
 163
 164         rcar_du_crtc_write(rcrtc, VDSR, mode->crtc_vtotal -
 165                                         mode->crtc_vsync_end - 2);
 166         rcar_du_crtc_write(rcrtc, VDER, mode->crtc_vtotal -
 167                                         mode->crtc_vsync_end +
 168                                         mode->crtc_vdisplay - 2);
 169         rcar_du_crtc_write(rcrtc, VSPR, mode->crtc_vtotal -
 170                                         mode->crtc_vsync_end +
 171                                         mode->crtc_vsync_start - 1);
 172         rcar_du_crtc_write(rcrtc, VCR,  mode->crtc_vtotal - 1);
 173
 174         rcar_du_crtc_write(rcrtc, DESR,  mode->htotal - mode->hsync_start);
 175         rcar_du_crtc_write(rcrtc, DEWR,  mode->hdisplay);
 176 }
 177
 178 void rcar_du_crtc_route_output(struct drm_crtc *crtc,
 179                                enum rcar_du_output output)
 180 {
 181         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 182         struct rcar_du_device *rcdu = rcrtc->group->dev;
 183
 184         /* Store the route from the CRTC output to the DU output. The DU will be
 185          * configured when starting the CRTC.
 186          */
 187         rcrtc->outputs |= BIT(output);
 188
 189         /* Store RGB routing to DPAD0, the hardware will be configured when
 190          * starting the CRTC.
 191          */
 192         if (output == RCAR_DU_OUTPUT_DPAD0)
 193                 rcdu->dpad0_source = rcrtc->index;
 194 }
 195
 196 static unsigned int plane_zpos(struct rcar_du_plane *plane)
 197 {
 198         return to_rcar_du_plane_state(plane->plane.state)->zpos;
 199 }
 200
 201 static const struct rcar_du_format_info *
 202 plane_format(struct rcar_du_plane *plane)
 203 {
 204         return to_rcar_du_plane_state(plane->plane.state)->format;
 205 }
 206
 207 static void rcar_du_crtc_update_planes(struct drm_crtc *crtc)
 208 {
 209         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 210         struct rcar_du_plane *planes[RCAR_DU_NUM_HW_PLANES];
 211         unsigned int num_planes = 0;
 212         unsigned int prio = 0;
 213         unsigned int i;
 214         u32 dptsr = 0;
 215         u32 dspr = 0;
 216
 217         for (i = 0; i < ARRAY_SIZE(rcrtc->group->planes.planes); ++i) {
 218                 struct rcar_du_plane *plane = &rcrtc->group->planes.planes[i];
 219                 unsigned int j;
 220
 221                 if (plane->plane.state->crtc != &rcrtc->crtc)
 222                         continue;
 223
 224                 /* Insert the plane in the sorted planes array. */
 225                 for (j = num_planes++; j > 0; --j) {
 226                         if (plane_zpos(planes[j-1]) <= plane_zpos(plane))
 227                                 break;
 228                         planes[j] = planes[j-1];
 229                 }
 230
 231                 planes[j] = plane;
 232                 prio += plane_format(plane)->planes * 4;
 233         }
 234
 235         for (i = 0; i < num_planes; ++i) {
 236                 struct rcar_du_plane *plane = planes[i];
 237                 unsigned int index = plane->hwindex;
 238
 239                 prio -= 4;
 240                 dspr |= (index + 1) << prio;
 241                 dptsr |= DPTSR_PnDK(index) |  DPTSR_PnTS(index);
 242
 243                 if (plane_format(plane)->planes == 2) {
 244                         index = (index + 1) % 8;
 245
 246                         prio -= 4;
 247                         dspr |= (index + 1) << prio;
 248                         dptsr |= DPTSR_PnDK(index) |  DPTSR_PnTS(index);
 249                 }
 250         }
 251
 252         /* Select display timing and dot clock generator 2 for planes associated
 253          * with superposition controller 2.
 254          */
 255         if (rcrtc->index % 2) {
 256                 u32 value = rcar_du_group_read(rcrtc->group, DPTSR);
 257
 258                 /* The DPTSR register is updated when the display controller is
 259                  * stopped. We thus need to restart the DU. Once again, sorry
 260                  * for the flicker. One way to mitigate the issue would be to
 261                  * pre-associate planes with CRTCs (either with a fixed 4/4
 262                  * split, or through a module parameter). Flicker would then
 263                  * occur only if we need to break the pre-association.
 264                  */
 265                 if (value != dptsr) {
 266                         rcar_du_group_write(rcrtc->group, DPTSR, dptsr);
 267                         if (rcrtc->group->used_crtcs)
 268                                 rcar_du_group_restart(rcrtc->group);
 269                 }
 270         }
 271
 272         rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR,
 273                             dspr);
 274 }
 275
 276 /* -----------------------------------------------------------------------------
 277  * Page Flip
 278  */
 279
 280 void rcar_du_crtc_cancel_page_flip(struct rcar_du_crtc *rcrtc,
 281                                    struct drm_file *file)
 282 {
 283         struct drm_pending_vblank_event *event;
 284         struct drm_device *dev = rcrtc->crtc.dev;
 285         unsigned long flags;
 286
 287         /* Destroy the pending vertical blanking event associated with the
 288          * pending page flip, if any, and disable vertical blanking interrupts.
 289          */
 290         spin_lock_irqsave(&dev->event_lock, flags);
 291         event = rcrtc->event;
 292         if (event && event->base.file_priv == file) {
 293                 rcrtc->event = NULL;
 294                 event->base.destroy(&event->base);
 295                 drm_crtc_vblank_put(&rcrtc->crtc);
 296         }
 297         spin_unlock_irqrestore(&dev->event_lock, flags);
 298 }
 299
 300 static void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc)
 301 {
 302         struct drm_pending_vblank_event *event;
 303         struct drm_device *dev = rcrtc->crtc.dev;
 304         unsigned long flags;
 305
 306         spin_lock_irqsave(&dev->event_lock, flags);
 307         event = rcrtc->event;
 308         rcrtc->event = NULL;
 309         spin_unlock_irqrestore(&dev->event_lock, flags);
 310
 311         if (event == NULL)
 312                 return;
 313
 314         spin_lock_irqsave(&dev->event_lock, flags);
 315         drm_send_vblank_event(dev, rcrtc->index, event);
 316         wake_up(&rcrtc->flip_wait);
 317         spin_unlock_irqrestore(&dev->event_lock, flags);
 318
 319         drm_crtc_vblank_put(&rcrtc->crtc);
 320 }
 321
 322 static bool rcar_du_crtc_page_flip_pending(struct rcar_du_crtc *rcrtc)
 323 {
 324         struct drm_device *dev = rcrtc->crtc.dev;
 325         unsigned long flags;
 326         bool pending;
 327
 328         spin_lock_irqsave(&dev->event_lock, flags);
 329         pending = rcrtc->event != NULL;
 330         spin_unlock_irqrestore(&dev->event_lock, flags);
 331
 332         return pending;
 333 }
 334
 335 static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
 336 {
 337         struct rcar_du_device *rcdu = rcrtc->group->dev;
 338
 339         if (wait_event_timeout(rcrtc->flip_wait,
 340                                !rcar_du_crtc_page_flip_pending(rcrtc),
 341                                msecs_to_jiffies(50)))
 342                 return;
 343
 344         dev_warn(rcdu->dev, "page flip timeout\n");
 345
 346         rcar_du_crtc_finish_page_flip(rcrtc);
 347 }
 348
 349 /* -----------------------------------------------------------------------------
 350  * Start/Stop and Suspend/Resume
 351  */
 352
 353 static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
 354 {
 355         struct drm_crtc *crtc = &rcrtc->crtc;
 356         bool interlaced;
 357         unsigned int i;
 358
 359         if (rcrtc->started)
 360                 return;
 361
 362         /* Set display off and background to black */
 363         rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
 364         rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
 365
 366         /* Configure display timings and output routing */
 367         rcar_du_crtc_set_display_timing(rcrtc);
 368         rcar_du_group_set_routing(rcrtc->group);
 369
 370         /* FIXME: Commit the planes state. This is required here as the CRTC can
 371          * be started from the system resume handler, which don't go
 372          * through .atomic_plane_update() and .atomic_flush() to commit plane
 373          * state. Additionally, given that the plane state atomic commit occurs
 374          * between CRTC disable and enable, the hardware state could also be
 375          * lost due to runtime PM, requiring a full commit here. This will be
 376          * fixed later after switching to atomic updates completely.
 377          */
 378         mutex_lock(&rcrtc->group->planes.lock);
 379         rcar_du_crtc_update_planes(crtc);
 380         mutex_unlock(&rcrtc->group->planes.lock);
 381
 382         for (i = 0; i < ARRAY_SIZE(rcrtc->group->planes.planes); ++i) {
 383                 struct rcar_du_plane *plane = &rcrtc->group->planes.planes[i];
 384
 385                 if (plane->plane.state->crtc != crtc)
 386                         continue;
 387
 388                 rcar_du_plane_setup(plane);
 389         }
 390
 391         /* Select master sync mode. This enables display operation in master
 392          * sync mode (with the HSYNC and VSYNC signals configured as outputs and
 393          * actively driven).
 394          */
 395         interlaced = rcrtc->crtc.mode.flags & DRM_MODE_FLAG_INTERLACE;
 396         rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK | DSYSR_SCM_MASK,
 397                              (interlaced ? DSYSR_SCM_INT_VIDEO : 0) |
 398                              DSYSR_TVM_MASTER);
 399
 400         rcar_du_group_start_stop(rcrtc->group, true);
 401
 402         /* Turn vertical blanking interrupt reporting back on. */
 403         drm_crtc_vblank_on(crtc);
 404
 405         rcrtc->started = true;
 406 }
 407
 408 static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 409 {
 410         struct drm_crtc *crtc = &rcrtc->crtc;
 411
 412         if (!rcrtc->started)
 413                 return;
 414
 415         /* Disable vertical blanking interrupt reporting. We first need to wait
 416          * for page flip completion before stopping the CRTC as userspace
 417          * expects page flips to eventually complete.
 418          */
 419         rcar_du_crtc_wait_page_flip(rcrtc);
 420         drm_crtc_vblank_off(crtc);
 421
 422         /* Select switch sync mode. This stops display operation and configures
 423          * the HSYNC and VSYNC signals as inputs.
 424          */
 425         rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);
 426
 427         rcar_du_group_start_stop(rcrtc->group, false);
 428
 429         rcrtc->started = false;
 430 }
 431
 432 void rcar_du_crtc_suspend(struct rcar_du_crtc *rcrtc)
 433 {
 434         rcar_du_crtc_stop(rcrtc);
 435         rcar_du_crtc_put(rcrtc);
 436 }
 437
 438 void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc)
 439 {
 440         if (!rcrtc->enabled)
 441                 return;
 442
 443         rcar_du_crtc_get(rcrtc);
 444         rcar_du_crtc_start(rcrtc);
 445 }
 446
 447 /* -----------------------------------------------------------------------------
 448  * CRTC Functions
 449  */
 450
 451 static void rcar_du_crtc_enable(struct drm_crtc *crtc)
 452 {
 453         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 454
 455         if (rcrtc->enabled)
 456                 return;
 457
 458         rcar_du_crtc_get(rcrtc);
 459         rcar_du_crtc_start(rcrtc);
 460
 461         rcrtc->enabled = true;
 462 }
 463
 464 static void rcar_du_crtc_disable(struct drm_crtc *crtc)
 465 {
 466         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 467
 468         if (!rcrtc->enabled)
 469                 return;
 470
 471         rcar_du_crtc_stop(rcrtc);
 472         rcar_du_crtc_put(rcrtc);
 473
 474         rcrtc->enabled = false;
 475         rcrtc->outputs = 0;
 476 }
 477
 478 static bool rcar_du_crtc_mode_fixup(struct drm_crtc *crtc,
 479                                     const struct drm_display_mode *mode,
 480                                     struct drm_display_mode *adjusted_mode)
 481 {
 482         /* TODO Fixup modes */
 483         return true;
 484 }
 485
 486 static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc)
 487 {
 488         struct drm_pending_vblank_event *event = crtc->state->event;
 489         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 490         struct drm_device *dev = rcrtc->crtc.dev;
 491         unsigned long flags;
 492
 493         /* We need to access the hardware during atomic update, acquire a
 494          * reference to the CRTC.
 495          */
 496         rcar_du_crtc_get(rcrtc);
 497
 498         if (event) {
 499                 event->pipe = rcrtc->index;
 500
 501                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 502
 503                 spin_lock_irqsave(&dev->event_lock, flags);
 504                 rcrtc->event = event;
 505                 spin_unlock_irqrestore(&dev->event_lock, flags);
 506         }
 507 }
 508
 509 static void rcar_du_crtc_atomic_flush(struct drm_crtc *crtc)
 510 {
 511         struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 512
 513         /* We're done, apply the configuration and drop the reference acquired
 514          * in .atomic_begin().
 515          */
 516         mutex_lock(&rcrtc->group->planes.lock);
 517         rcar_du_crtc_update_planes(crtc);
 518         mutex_unlock(&rcrtc->group->planes.lock);
 519
 520         rcar_du_crtc_put(rcrtc);
 521 }
 522
 523 static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
 524         .mode_fixup = rcar_du_crtc_mode_fixup,
 525         .disable = rcar_du_crtc_disable,
 526         .enable = rcar_du_crtc_enable,
 527         .atomic_begin = rcar_du_crtc_atomic_begin,
 528         .atomic_flush = rcar_du_crtc_atomic_flush,
 529 };
 530
 531 static const struct drm_crtc_funcs crtc_funcs = {
 532         .reset = drm_atomic_helper_crtc_reset,
 533         .destroy = drm_crtc_cleanup,
 534         .set_config = drm_atomic_helper_set_config,
 535         .page_flip = drm_atomic_helper_page_flip,
 536         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 537         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 538 };
 539
 540 /* -----------------------------------------------------------------------------
 541  * Interrupt Handling
 542  */
 543
 544 static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
 545 {
 546         struct rcar_du_crtc *rcrtc = arg;
 547         irqreturn_t ret = IRQ_NONE;
 548         u32 status;
 549
 550         status = rcar_du_crtc_read(rcrtc, DSSR);
 551         rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
 552
 553         if (status & DSSR_FRM) {
 554                 drm_handle_vblank(rcrtc->crtc.dev, rcrtc->index);
 555                 rcar_du_crtc_finish_page_flip(rcrtc);
 556                 ret = IRQ_HANDLED;
 557         }
 558
 559         return ret;
 560 }
 561
 562 /* -----------------------------------------------------------------------------
 563  * Initialization
 564  */
 565
 566 int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index)
 567 {
 568         static const unsigned int mmio_offsets[] = {
 569                 DU0_REG_OFFSET, DU1_REG_OFFSET, DU2_REG_OFFSET
 570         };
 571
 572         struct rcar_du_device *rcdu = rgrp->dev;
 573         struct platform_device *pdev = to_platform_device(rcdu->dev);
 574         struct rcar_du_crtc *rcrtc = &rcdu->crtcs[index];
 575         struct drm_crtc *crtc = &rcrtc->crtc;
 576         unsigned int irqflags;
 577         struct clk *clk;
 578         char clk_name[9];
 579         char *name;
 580         int irq;
 581         int ret;
 582
 583         /* Get the CRTC clock and the optional external clock. */
 584         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
 585                 sprintf(clk_name, "du.%u", index);
 586                 name = clk_name;
 587         } else {
 588                 name = NULL;
 589         }
 590
 591         rcrtc->clock = devm_clk_get(rcdu->dev, name);
 592         if (IS_ERR(rcrtc->clock)) {
 593                 dev_err(rcdu->dev, "no clock for CRTC %u\n", index);
 594                 return PTR_ERR(rcrtc->clock);
 595         }
 596
 597         sprintf(clk_name, "dclkin.%u", index);
 598         clk = devm_clk_get(rcdu->dev, clk_name);
 599         if (!IS_ERR(clk)) {
 600                 rcrtc->extclock = clk;
 601         } else if (PTR_ERR(rcrtc->clock) == -EPROBE_DEFER) {
 602                 dev_info(rcdu->dev, "can't get external clock %u\n", index);
 603                 return -EPROBE_DEFER;
 604         }
 605
 606         init_waitqueue_head(&rcrtc->flip_wait);
 607
 608         rcrtc->group = rgrp;
 609         rcrtc->mmio_offset = mmio_offsets[index];
 610         rcrtc->index = index;
 611         rcrtc->enabled = false;
 612
 613         ret = drm_crtc_init_with_planes(rcdu->ddev, crtc,
 614                                         &rgrp->planes.planes[index % 2].plane,
 615                                         NULL, &crtc_funcs);
 616         if (ret < 0)
 617                 return ret;
 618
 619         drm_crtc_helper_add(crtc, &crtc_helper_funcs);
 620
 621         /* Start with vertical blanking interrupt reporting disabled. */
 622         drm_crtc_vblank_off(crtc);
 623
 624         /* Register the interrupt handler. */
 625         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
 626                 irq = platform_get_irq(pdev, index);
 627                 irqflags = 0;
 628         } else {
 629                 irq = platform_get_irq(pdev, 0);
 630                 irqflags = IRQF_SHARED;
 631         }
 632
 633         if (irq < 0) {
 634                 dev_err(rcdu->dev, "no IRQ for CRTC %u\n", index);
 635                 return irq;
 636         }
 637
 638         ret = devm_request_irq(rcdu->dev, irq, rcar_du_crtc_irq, irqflags,
 639                                dev_name(rcdu->dev), rcrtc);
 640         if (ret < 0) {
 641                 dev_err(rcdu->dev,
 642                         "failed to register IRQ for CRTC %u\n", index);
 643                 return ret;
 644         }
 645
 646         return 0;
 647 }
 648
 649 void rcar_du_crtc_enable_vblank(struct rcar_du_crtc *rcrtc, bool enable)
 650 {
 651         if (enable) {
 652                 rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
 653                 rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
 654         } else {
 655                 rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
 656         }
 657 }