drivers/gpu/drm/omapdrm/omap_crtc.c

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   3  * Author: Rob Clark <[email protected]>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  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_mode.h>
  23 #include <drm/drm_plane_helper.h>
  24 #include <linux/math64.h>
  25
  26 #include "omap_drv.h"
  27
  28 #define to_omap_crtc_state(x) container_of(x, struct omap_crtc_state, base)
  29
  30 struct omap_crtc_state {
  31         /* Must be first. */
  32         struct drm_crtc_state base;
  33         /* Shadow values for legacy userspace support. */
  34         unsigned int rotation;
  35         unsigned int zpos;
  36 };
  37
  38 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
  39
  40 struct omap_crtc {
  41         struct drm_crtc base;
  42
  43         const char *name;
  44         enum omap_channel channel;
  45
  46         struct videomode vm;
  47
  48         bool ignore_digit_sync_lost;
  49
  50         bool enabled;
  51         bool pending;
  52         wait_queue_head_t pending_wait;
  53         struct drm_pending_vblank_event *event;
  54 };
  55
  56 /* -----------------------------------------------------------------------------
  57  * Helper Functions
  58  */
  59
  60 struct videomode *omap_crtc_timings(struct drm_crtc *crtc)
  61 {
  62         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  63         return &omap_crtc->vm;
  64 }
  65
  66 enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
  67 {
  68         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  69         return omap_crtc->channel;
  70 }
  71
  72 static bool omap_crtc_is_pending(struct drm_crtc *crtc)
  73 {
  74         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  75         unsigned long flags;
  76         bool pending;
  77
  78         spin_lock_irqsave(&crtc->dev->event_lock, flags);
  79         pending = omap_crtc->pending;
  80         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
  81
  82         return pending;
  83 }
  84
  85 int omap_crtc_wait_pending(struct drm_crtc *crtc)
  86 {
  87         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  88
  89         /*
  90          * Timeout is set to a "sufficiently" high value, which should cover
  91          * a single frame refresh even on slower displays.
  92          */
  93         return wait_event_timeout(omap_crtc->pending_wait,
  94                                   !omap_crtc_is_pending(crtc),
  95                                   msecs_to_jiffies(250));
  96 }
  97
  98 /* -----------------------------------------------------------------------------
  99  * DSS Manager Functions
 100  */
 101
 102 /*
 103  * Manager-ops, callbacks from output when they need to configure
 104  * the upstream part of the video pipe.
 105  *
 106  * Most of these we can ignore until we add support for command-mode
 107  * panels.. for video-mode the crtc-helpers already do an adequate
 108  * job of sequencing the setup of the video pipe in the proper order
 109  */
 110
 111 /* ovl-mgr-id -> crtc */
 112 static struct omap_crtc *omap_crtcs[8];
 113 static struct omap_dss_device *omap_crtc_output[8];
 114
 115 /* we can probably ignore these until we support command-mode panels: */
 116 static int omap_crtc_dss_connect(enum omap_channel channel,
 117                 struct omap_dss_device *dst)
 118 {
 119         const struct dispc_ops *dispc_ops = dispc_get_ops();
 120
 121         if (omap_crtc_output[channel])
 122                 return -EINVAL;
 123
 124         if ((dispc_ops->mgr_get_supported_outputs(channel) & dst->id) == 0)
 125                 return -EINVAL;
 126
 127         omap_crtc_output[channel] = dst;
 128         dst->dispc_channel_connected = true;
 129
 130         return 0;
 131 }
 132
 133 static void omap_crtc_dss_disconnect(enum omap_channel channel,
 134                 struct omap_dss_device *dst)
 135 {
 136         omap_crtc_output[channel] = NULL;
 137         dst->dispc_channel_connected = false;
 138 }
 139
 140 static void omap_crtc_dss_start_update(enum omap_channel channel)
 141 {
 142 }
 143
 144 /* Called only from the encoder enable/disable and suspend/resume handlers. */
 145 static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 146 {
 147         struct drm_device *dev = crtc->dev;
 148         struct omap_drm_private *priv = dev->dev_private;
 149         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 150         enum omap_channel channel = omap_crtc->channel;
 151         struct omap_irq_wait *wait;
 152         u32 framedone_irq, vsync_irq;
 153         int ret;
 154
 155         if (WARN_ON(omap_crtc->enabled == enable))
 156                 return;
 157
 158         if (omap_crtc_output[channel]->output_type == OMAP_DISPLAY_TYPE_HDMI) {
 159                 priv->dispc_ops->mgr_enable(channel, enable);
 160                 omap_crtc->enabled = enable;
 161                 return;
 162         }
 163
 164         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 165                 /*
 166                  * Digit output produces some sync lost interrupts during the
 167                  * first frame when enabling, so we need to ignore those.
 168                  */
 169                 omap_crtc->ignore_digit_sync_lost = true;
 170         }
 171
 172         framedone_irq = priv->dispc_ops->mgr_get_framedone_irq(channel);
 173         vsync_irq = priv->dispc_ops->mgr_get_vsync_irq(channel);
 174
 175         if (enable) {
 176                 wait = omap_irq_wait_init(dev, vsync_irq, 1);
 177         } else {
 178                 /*
 179                  * When we disable the digit output, we need to wait for
 180                  * FRAMEDONE to know that DISPC has finished with the output.
 181                  *
 182                  * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
 183                  * that case we need to use vsync interrupt, and wait for both
 184                  * even and odd frames.
 185                  */
 186
 187                 if (framedone_irq)
 188                         wait = omap_irq_wait_init(dev, framedone_irq, 1);
 189                 else
 190                         wait = omap_irq_wait_init(dev, vsync_irq, 2);
 191         }
 192
 193         priv->dispc_ops->mgr_enable(channel, enable);
 194         omap_crtc->enabled = enable;
 195
 196         ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
 197         if (ret) {
 198                 dev_err(dev->dev, "%s: timeout waiting for %s\n",
 199                                 omap_crtc->name, enable ? "enable" : "disable");
 200         }
 201
 202         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 203                 omap_crtc->ignore_digit_sync_lost = false;
 204                 /* make sure the irq handler sees the value above */
 205                 mb();
 206         }
 207 }
 208
 209
 210 static int omap_crtc_dss_enable(enum omap_channel channel)
 211 {
 212         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 213         struct omap_drm_private *priv = omap_crtc->base.dev->dev_private;
 214
 215         priv->dispc_ops->mgr_set_timings(omap_crtc->channel, &omap_crtc->vm);
 216         omap_crtc_set_enabled(&omap_crtc->base, true);
 217
 218         return 0;
 219 }
 220
 221 static void omap_crtc_dss_disable(enum omap_channel channel)
 222 {
 223         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 224
 225         omap_crtc_set_enabled(&omap_crtc->base, false);
 226 }
 227
 228 static void omap_crtc_dss_set_timings(enum omap_channel channel,
 229                 const struct videomode *vm)
 230 {
 231         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 232         DBG("%s", omap_crtc->name);
 233         omap_crtc->vm = *vm;
 234 }
 235
 236 static void omap_crtc_dss_set_lcd_config(enum omap_channel channel,
 237                 const struct dss_lcd_mgr_config *config)
 238 {
 239         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 240         struct omap_drm_private *priv = omap_crtc->base.dev->dev_private;
 241
 242         DBG("%s", omap_crtc->name);
 243         priv->dispc_ops->mgr_set_lcd_config(omap_crtc->channel, config);
 244 }
 245
 246 static int omap_crtc_dss_register_framedone(
 247                 enum omap_channel channel,
 248                 void (*handler)(void *), void *data)
 249 {
 250         return 0;
 251 }
 252
 253 static void omap_crtc_dss_unregister_framedone(
 254                 enum omap_channel channel,
 255                 void (*handler)(void *), void *data)
 256 {
 257 }
 258
 259 static const struct dss_mgr_ops mgr_ops = {
 260         .connect = omap_crtc_dss_connect,
 261         .disconnect = omap_crtc_dss_disconnect,
 262         .start_update = omap_crtc_dss_start_update,
 263         .enable = omap_crtc_dss_enable,
 264         .disable = omap_crtc_dss_disable,
 265         .set_timings = omap_crtc_dss_set_timings,
 266         .set_lcd_config = omap_crtc_dss_set_lcd_config,
 267         .register_framedone_handler = omap_crtc_dss_register_framedone,
 268         .unregister_framedone_handler = omap_crtc_dss_unregister_framedone,
 269 };
 270
 271 /* -----------------------------------------------------------------------------
 272  * Setup, Flush and Page Flip
 273  */
 274
 275 void omap_crtc_error_irq(struct drm_crtc *crtc, uint32_t irqstatus)
 276 {
 277         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 278
 279         if (omap_crtc->ignore_digit_sync_lost) {
 280                 irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
 281                 if (!irqstatus)
 282                         return;
 283         }
 284
 285         DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
 286 }
 287
 288 void omap_crtc_vblank_irq(struct drm_crtc *crtc)
 289 {
 290         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 291         struct drm_device *dev = omap_crtc->base.dev;
 292         struct omap_drm_private *priv = dev->dev_private;
 293         bool pending;
 294
 295         spin_lock(&crtc->dev->event_lock);
 296         /*
 297          * If the dispc is busy we're racing the flush operation. Try again on
 298          * the next vblank interrupt.
 299          */
 300         if (priv->dispc_ops->mgr_go_busy(omap_crtc->channel)) {
 301                 spin_unlock(&crtc->dev->event_lock);
 302                 return;
 303         }
 304
 305         /* Send the vblank event if one has been requested. */
 306         if (omap_crtc->event) {
 307                 drm_crtc_send_vblank_event(crtc, omap_crtc->event);
 308                 omap_crtc->event = NULL;
 309         }
 310
 311         pending = omap_crtc->pending;
 312         omap_crtc->pending = false;
 313         spin_unlock(&crtc->dev->event_lock);
 314
 315         if (pending)
 316                 drm_crtc_vblank_put(crtc);
 317
 318         /* Wake up omap_atomic_complete. */
 319         wake_up(&omap_crtc->pending_wait);
 320
 321         DBG("%s: apply done", omap_crtc->name);
 322 }
 323
 324 static void omap_crtc_write_crtc_properties(struct drm_crtc *crtc)
 325 {
 326         struct omap_drm_private *priv = crtc->dev->dev_private;
 327         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 328         struct omap_overlay_manager_info info;
 329
 330         memset(&info, 0, sizeof(info));
 331
 332         info.default_color = 0x000000;
 333         info.trans_enabled = false;
 334         info.partial_alpha_enabled = false;
 335         info.cpr_enable = false;
 336
 337         priv->dispc_ops->mgr_setup(omap_crtc->channel, &info);
 338 }
 339
 340 /* -----------------------------------------------------------------------------
 341  * CRTC Functions
 342  */
 343
 344 static void omap_crtc_destroy(struct drm_crtc *crtc)
 345 {
 346         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 347
 348         DBG("%s", omap_crtc->name);
 349
 350         drm_crtc_cleanup(crtc);
 351
 352         kfree(omap_crtc);
 353 }
 354
 355 static void omap_crtc_arm_event(struct drm_crtc *crtc)
 356 {
 357         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 358
 359         WARN_ON(omap_crtc->pending);
 360         omap_crtc->pending = true;
 361
 362         if (crtc->state->event) {
 363                 omap_crtc->event = crtc->state->event;
 364                 crtc->state->event = NULL;
 365         }
 366 }
 367
 368 static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
 369                                     struct drm_crtc_state *old_state)
 370 {
 371         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 372         int ret;
 373
 374         DBG("%s", omap_crtc->name);
 375
 376         spin_lock_irq(&crtc->dev->event_lock);
 377         drm_crtc_vblank_on(crtc);
 378         ret = drm_crtc_vblank_get(crtc);
 379         WARN_ON(ret != 0);
 380
 381         omap_crtc_arm_event(crtc);
 382         spin_unlock_irq(&crtc->dev->event_lock);
 383 }
 384
 385 static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
 386                                      struct drm_crtc_state *old_state)
 387 {
 388         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 389
 390         DBG("%s", omap_crtc->name);
 391
 392         spin_lock_irq(&crtc->dev->event_lock);
 393         if (crtc->state->event) {
 394                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 395                 crtc->state->event = NULL;
 396         }
 397         spin_unlock_irq(&crtc->dev->event_lock);
 398
 399         drm_crtc_vblank_off(crtc);
 400 }
 401
 402 static enum drm_mode_status omap_crtc_mode_valid(struct drm_crtc *crtc,
 403                                         const struct drm_display_mode *mode)
 404 {
 405         struct omap_drm_private *priv = crtc->dev->dev_private;
 406
 407         /* Check for bandwidth limit */
 408         if (priv->max_bandwidth) {
 409                 /*
 410                  * Estimation for the bandwidth need of a given mode with one
 411                  * full screen plane:
 412                  * bandwidth = resolution * 32bpp * (pclk / (vtotal * htotal))
 413                  *                                      ^^ Refresh rate ^^
 414                  *
 415                  * The interlaced mode is taken into account by using the
 416                  * pixelclock in the calculation.
 417                  *
 418                  * The equation is rearranged for 64bit arithmetic.
 419                  */
 420                 uint64_t bandwidth = mode->clock * 1000;
 421                 unsigned int bpp = 4;
 422
 423                 bandwidth = bandwidth * mode->hdisplay * mode->vdisplay * bpp;
 424                 bandwidth = div_u64(bandwidth, mode->htotal * mode->vtotal);
 425
 426                 /*
 427                  * Reject modes which would need more bandwidth if used with one
 428                  * full resolution plane (most common use case).
 429                  */
 430                 if (priv->max_bandwidth < bandwidth)
 431                         return MODE_BAD;
 432         }
 433
 434         return MODE_OK;
 435 }
 436
 437 static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 438 {
 439         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 440         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 441         struct omap_drm_private *priv = crtc->dev->dev_private;
 442         const u32 flags_mask = DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_DE_LOW |
 443                 DISPLAY_FLAGS_PIXDATA_POSEDGE | DISPLAY_FLAGS_PIXDATA_NEGEDGE |
 444                 DISPLAY_FLAGS_SYNC_POSEDGE | DISPLAY_FLAGS_SYNC_NEGEDGE;
 445         unsigned int i;
 446
 447         DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 448             omap_crtc->name, mode->base.id, mode->name,
 449             mode->vrefresh, mode->clock,
 450             mode->hdisplay, mode->hsync_start, mode->hsync_end, mode->htotal,
 451             mode->vdisplay, mode->vsync_start, mode->vsync_end, mode->vtotal,
 452             mode->type, mode->flags);
 453
 454         drm_display_mode_to_videomode(mode, &omap_crtc->vm);
 455
 456         /*
 457          * HACK: This fixes the vm flags.
 458          * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags
 459          * and they get lost when converting back and forth between
 460          * struct drm_display_mode and struct videomode. The hack below
 461          * goes and fetches the missing flags from the panel drivers.
 462          *
 463          * Correct solution would be to use DRM's bus-flags, but that's not
 464          * easily possible before the omapdrm's panel/encoder driver model
 465          * has been changed to the DRM model.
 466          */
 467
 468         for (i = 0; i < priv->num_encoders; ++i) {
 469                 struct drm_encoder *encoder = priv->encoders[i];
 470
 471                 if (encoder->crtc == crtc) {
 472                         struct omap_dss_device *dssdev;
 473
 474                         dssdev = omap_encoder_get_dssdev(encoder);
 475
 476                         if (dssdev) {
 477                                 struct videomode vm = {0};
 478
 479                                 dssdev->driver->get_timings(dssdev, &vm);
 480
 481                                 omap_crtc->vm.flags |= vm.flags & flags_mask;
 482                         }
 483
 484                         break;
 485                 }
 486         }
 487 }
 488
 489 static int omap_crtc_atomic_check(struct drm_crtc *crtc,
 490                                 struct drm_crtc_state *state)
 491 {
 492         struct drm_plane_state *pri_state;
 493
 494         if (state->color_mgmt_changed && state->gamma_lut) {
 495                 uint length = state->gamma_lut->length /
 496                         sizeof(struct drm_color_lut);
 497
 498                 if (length < 2)
 499                         return -EINVAL;
 500         }
 501
 502         pri_state = drm_atomic_get_new_plane_state(state->state, crtc->primary);
 503         if (pri_state) {
 504                 struct omap_crtc_state *omap_crtc_state =
 505                         to_omap_crtc_state(state);
 506
 507                 /* Mirror new values for zpos and rotation in omap_crtc_state */
 508                 omap_crtc_state->zpos = pri_state->zpos;
 509                 omap_crtc_state->rotation = pri_state->rotation;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static void omap_crtc_atomic_begin(struct drm_crtc *crtc,
 516                                    struct drm_crtc_state *old_crtc_state)
 517 {
 518 }
 519
 520 static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
 521                                    struct drm_crtc_state *old_crtc_state)
 522 {
 523         struct omap_drm_private *priv = crtc->dev->dev_private;
 524         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 525         int ret;
 526
 527         if (crtc->state->color_mgmt_changed) {
 528                 struct drm_color_lut *lut = NULL;
 529                 uint length = 0;
 530
 531                 if (crtc->state->gamma_lut) {
 532                         lut = (struct drm_color_lut *)
 533                                 crtc->state->gamma_lut->data;
 534                         length = crtc->state->gamma_lut->length /
 535                                 sizeof(*lut);
 536                 }
 537                 priv->dispc_ops->mgr_set_gamma(omap_crtc->channel, lut, length);
 538         }
 539
 540         omap_crtc_write_crtc_properties(crtc);
 541
 542         /* Only flush the CRTC if it is currently enabled. */
 543         if (!omap_crtc->enabled)
 544                 return;
 545
 546         DBG("%s: GO", omap_crtc->name);
 547
 548         ret = drm_crtc_vblank_get(crtc);
 549         WARN_ON(ret != 0);
 550
 551         spin_lock_irq(&crtc->dev->event_lock);
 552         priv->dispc_ops->mgr_go(omap_crtc->channel);
 553         omap_crtc_arm_event(crtc);
 554         spin_unlock_irq(&crtc->dev->event_lock);
 555 }
 556
 557 static int omap_crtc_atomic_set_property(struct drm_crtc *crtc,
 558                                          struct drm_crtc_state *state,
 559                                          struct drm_property *property,
 560                                          uint64_t val)
 561 {
 562         struct omap_drm_private *priv = crtc->dev->dev_private;
 563         struct drm_plane_state *plane_state;
 564
 565         /*
 566          * Delegate property set to the primary plane. Get the plane state and
 567          * set the property directly, the shadow copy will be assigned in the
 568          * omap_crtc_atomic_check callback. This way updates to plane state will
 569          * always be mirrored in the crtc state correctly.
 570          */
 571         plane_state = drm_atomic_get_plane_state(state->state, crtc->primary);
 572         if (IS_ERR(plane_state))
 573                 return PTR_ERR(plane_state);
 574
 575         if (property == crtc->primary->rotation_property)
 576                 plane_state->rotation = val;
 577         else if (property == priv->zorder_prop)
 578                 plane_state->zpos = val;
 579         else
 580                 return -EINVAL;
 581
 582         return 0;
 583 }
 584
 585 static int omap_crtc_atomic_get_property(struct drm_crtc *crtc,
 586                                          const struct drm_crtc_state *state,
 587                                          struct drm_property *property,
 588                                          uint64_t *val)
 589 {
 590         struct omap_drm_private *priv = crtc->dev->dev_private;
 591         struct omap_crtc_state *omap_state = to_omap_crtc_state(state);
 592
 593         if (property == crtc->primary->rotation_property)
 594                 *val = omap_state->rotation;
 595         else if (property == priv->zorder_prop)
 596                 *val = omap_state->zpos;
 597         else
 598                 return -EINVAL;
 599
 600         return 0;
 601 }
 602
 603 static void omap_crtc_reset(struct drm_crtc *crtc)
 604 {
 605         if (crtc->state)
 606                 __drm_atomic_helper_crtc_destroy_state(crtc->state);
 607
 608         kfree(crtc->state);
 609         crtc->state = kzalloc(sizeof(struct omap_crtc_state), GFP_KERNEL);
 610
 611         if (crtc->state)
 612                 crtc->state->crtc = crtc;
 613 }
 614
 615 static struct drm_crtc_state *
 616 omap_crtc_duplicate_state(struct drm_crtc *crtc)
 617 {
 618         struct omap_crtc_state *state, *current_state;
 619
 620         if (WARN_ON(!crtc->state))
 621                 return NULL;
 622
 623         current_state = to_omap_crtc_state(crtc->state);
 624
 625         state = kmalloc(sizeof(*state), GFP_KERNEL);
 626         if (!state)
 627                 return NULL;
 628
 629         __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
 630
 631         state->zpos = current_state->zpos;
 632         state->rotation = current_state->rotation;
 633
 634         return &state->base;
 635 }
 636
 637 static const struct drm_crtc_funcs omap_crtc_funcs = {
 638         .reset = omap_crtc_reset,
 639         .set_config = drm_atomic_helper_set_config,
 640         .destroy = omap_crtc_destroy,
 641         .page_flip = drm_atomic_helper_page_flip,
 642         .gamma_set = drm_atomic_helper_legacy_gamma_set,
 643         .atomic_duplicate_state = omap_crtc_duplicate_state,
 644         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 645         .atomic_set_property = omap_crtc_atomic_set_property,
 646         .atomic_get_property = omap_crtc_atomic_get_property,
 647         .enable_vblank = omap_irq_enable_vblank,
 648         .disable_vblank = omap_irq_disable_vblank,
 649 };
 650
 651 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 652         .mode_set_nofb = omap_crtc_mode_set_nofb,
 653         .atomic_check = omap_crtc_atomic_check,
 654         .atomic_begin = omap_crtc_atomic_begin,
 655         .atomic_flush = omap_crtc_atomic_flush,
 656         .atomic_enable = omap_crtc_atomic_enable,
 657         .atomic_disable = omap_crtc_atomic_disable,
 658         .mode_valid = omap_crtc_mode_valid,
 659 };
 660
 661 /* -----------------------------------------------------------------------------
 662  * Init and Cleanup
 663  */
 664
 665 static const char *channel_names[] = {
 666         [OMAP_DSS_CHANNEL_LCD] = "lcd",
 667         [OMAP_DSS_CHANNEL_DIGIT] = "tv",
 668         [OMAP_DSS_CHANNEL_LCD2] = "lcd2",
 669         [OMAP_DSS_CHANNEL_LCD3] = "lcd3",
 670 };
 671
 672 void omap_crtc_pre_init(void)
 673 {
 674         memset(omap_crtcs, 0, sizeof(omap_crtcs));
 675
 676         dss_install_mgr_ops(&mgr_ops);
 677 }
 678
 679 void omap_crtc_pre_uninit(void)
 680 {
 681         dss_uninstall_mgr_ops();
 682 }
 683
 684 /* initialize crtc */
 685 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 686                 struct drm_plane *plane, struct omap_dss_device *dssdev)
 687 {
 688         struct omap_drm_private *priv = dev->dev_private;
 689         struct drm_crtc *crtc = NULL;
 690         struct omap_crtc *omap_crtc;
 691         enum omap_channel channel;
 692         struct omap_dss_device *out;
 693         int ret;
 694
 695         out = omapdss_find_output_from_display(dssdev);
 696         channel = out->dispc_channel;
 697         omap_dss_put_device(out);
 698
 699         DBG("%s", channel_names[channel]);
 700
 701         /* Multiple displays on same channel is not allowed */
 702         if (WARN_ON(omap_crtcs[channel] != NULL))
 703                 return ERR_PTR(-EINVAL);
 704
 705         omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 706         if (!omap_crtc)
 707                 return ERR_PTR(-ENOMEM);
 708
 709         crtc = &omap_crtc->base;
 710
 711         init_waitqueue_head(&omap_crtc->pending_wait);
 712
 713         omap_crtc->channel = channel;
 714         omap_crtc->name = channel_names[channel];
 715
 716         ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
 717                                         &omap_crtc_funcs, NULL);
 718         if (ret < 0) {
 719                 dev_err(dev->dev, "%s(): could not init crtc for: %s\n",
 720                         __func__, dssdev->name);
 721                 kfree(omap_crtc);
 722                 return ERR_PTR(ret);
 723         }
 724
 725         drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 726
 727         /* The dispc API adapts to what ever size, but the HW supports
 728          * 256 element gamma table for LCDs and 1024 element table for
 729          * OMAP_DSS_CHANNEL_DIGIT. X server assumes 256 element gamma
 730          * tables so lets use that. Size of HW gamma table can be
 731          * extracted with dispc_mgr_gamma_size(). If it returns 0
 732          * gamma table is not supprted.
 733          */
 734         if (priv->dispc_ops->mgr_gamma_size(channel)) {
 735                 uint gamma_lut_size = 256;
 736
 737                 drm_crtc_enable_color_mgmt(crtc, 0, false, gamma_lut_size);
 738                 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
 739         }
 740
 741         omap_plane_install_properties(crtc->primary, &crtc->base);
 742
 743         omap_crtcs[channel] = omap_crtc;
 744
 745         return crtc;
 746 }