drivers/gpu/drm/omapdrm/omap_crtc.c

   1 /*
   2  * drivers/gpu/drm/omapdrm/omap_crtc.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <drm/drm_atomic.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_crtc.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_mode.h>
  25 #include <drm/drm_plane_helper.h>
  26
  27 #include "omap_drv.h"
  28
  29 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
  30
  31 struct omap_crtc {
  32         struct drm_crtc base;
  33
  34         const char *name;
  35         enum omap_channel channel;
  36
  37         struct videomode vm;
  38
  39         bool ignore_digit_sync_lost;
  40
  41         bool enabled;
  42         bool pending;
  43         wait_queue_head_t pending_wait;
  44         struct drm_pending_vblank_event *event;
  45 };
  46
  47 /* -----------------------------------------------------------------------------
  48  * Helper Functions
  49  */
  50
  51 struct videomode *omap_crtc_timings(struct drm_crtc *crtc)
  52 {
  53         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  54         return &omap_crtc->vm;
  55 }
  56
  57 enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
  58 {
  59         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  60         return omap_crtc->channel;
  61 }
  62
  63 static bool omap_crtc_is_pending(struct drm_crtc *crtc)
  64 {
  65         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  66         unsigned long flags;
  67         bool pending;
  68
  69         spin_lock_irqsave(&crtc->dev->event_lock, flags);
  70         pending = omap_crtc->pending;
  71         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
  72
  73         return pending;
  74 }
  75
  76 int omap_crtc_wait_pending(struct drm_crtc *crtc)
  77 {
  78         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  79
  80         /*
  81          * Timeout is set to a "sufficiently" high value, which should cover
  82          * a single frame refresh even on slower displays.
  83          */
  84         return wait_event_timeout(omap_crtc->pending_wait,
  85                                   !omap_crtc_is_pending(crtc),
  86                                   msecs_to_jiffies(250));
  87 }
  88
  89 /* -----------------------------------------------------------------------------
  90  * DSS Manager Functions
  91  */
  92
  93 /*
  94  * Manager-ops, callbacks from output when they need to configure
  95  * the upstream part of the video pipe.
  96  *
  97  * Most of these we can ignore until we add support for command-mode
  98  * panels.. for video-mode the crtc-helpers already do an adequate
  99  * job of sequencing the setup of the video pipe in the proper order
 100  */
 101
 102 /* ovl-mgr-id -> crtc */
 103 static struct omap_crtc *omap_crtcs[8];
 104 static struct omap_dss_device *omap_crtc_output[8];
 105
 106 /* we can probably ignore these until we support command-mode panels: */
 107 static int omap_crtc_dss_connect(enum omap_channel channel,
 108                 struct omap_dss_device *dst)
 109 {
 110         if (omap_crtc_output[channel])
 111                 return -EINVAL;
 112
 113         if ((dispc_mgr_get_supported_outputs(channel) & dst->id) == 0)
 114                 return -EINVAL;
 115
 116         omap_crtc_output[channel] = dst;
 117         dst->dispc_channel_connected = true;
 118
 119         return 0;
 120 }
 121
 122 static void omap_crtc_dss_disconnect(enum omap_channel channel,
 123                 struct omap_dss_device *dst)
 124 {
 125         omap_crtc_output[channel] = NULL;
 126         dst->dispc_channel_connected = false;
 127 }
 128
 129 static void omap_crtc_dss_start_update(enum omap_channel channel)
 130 {
 131 }
 132
 133 /* Called only from the encoder enable/disable and suspend/resume handlers. */
 134 static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 135 {
 136         struct drm_device *dev = crtc->dev;
 137         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 138         enum omap_channel channel = omap_crtc->channel;
 139         struct omap_irq_wait *wait;
 140         u32 framedone_irq, vsync_irq;
 141         int ret;
 142
 143         if (WARN_ON(omap_crtc->enabled == enable))
 144                 return;
 145
 146         if (omap_crtc_output[channel]->output_type == OMAP_DISPLAY_TYPE_HDMI) {
 147                 dispc_mgr_enable(channel, enable);
 148                 omap_crtc->enabled = enable;
 149                 return;
 150         }
 151
 152         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 153                 /*
 154                  * Digit output produces some sync lost interrupts during the
 155                  * first frame when enabling, so we need to ignore those.
 156                  */
 157                 omap_crtc->ignore_digit_sync_lost = true;
 158         }
 159
 160         framedone_irq = dispc_mgr_get_framedone_irq(channel);
 161         vsync_irq = dispc_mgr_get_vsync_irq(channel);
 162
 163         if (enable) {
 164                 wait = omap_irq_wait_init(dev, vsync_irq, 1);
 165         } else {
 166                 /*
 167                  * When we disable the digit output, we need to wait for
 168                  * FRAMEDONE to know that DISPC has finished with the output.
 169                  *
 170                  * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
 171                  * that case we need to use vsync interrupt, and wait for both
 172                  * even and odd frames.
 173                  */
 174
 175                 if (framedone_irq)
 176                         wait = omap_irq_wait_init(dev, framedone_irq, 1);
 177                 else
 178                         wait = omap_irq_wait_init(dev, vsync_irq, 2);
 179         }
 180
 181         dispc_mgr_enable(channel, enable);
 182         omap_crtc->enabled = enable;
 183
 184         ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
 185         if (ret) {
 186                 dev_err(dev->dev, "%s: timeout waiting for %s\n",
 187                                 omap_crtc->name, enable ? "enable" : "disable");
 188         }
 189
 190         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 191                 omap_crtc->ignore_digit_sync_lost = false;
 192                 /* make sure the irq handler sees the value above */
 193                 mb();
 194         }
 195 }
 196
 197
 198 static int omap_crtc_dss_enable(enum omap_channel channel)
 199 {
 200         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 201         struct omap_overlay_manager_info info;
 202
 203         memset(&info, 0, sizeof(info));
 204         info.default_color = 0x00000000;
 205         info.trans_key = 0x00000000;
 206         info.trans_key_type = OMAP_DSS_COLOR_KEY_GFX_DST;
 207         info.trans_enabled = false;
 208
 209         dispc_mgr_setup(omap_crtc->channel, &info);
 210         dispc_mgr_set_timings(omap_crtc->channel,
 211                         &omap_crtc->vm);
 212         omap_crtc_set_enabled(&omap_crtc->base, true);
 213
 214         return 0;
 215 }
 216
 217 static void omap_crtc_dss_disable(enum omap_channel channel)
 218 {
 219         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 220
 221         omap_crtc_set_enabled(&omap_crtc->base, false);
 222 }
 223
 224 static void omap_crtc_dss_set_timings(enum omap_channel channel,
 225                 const struct videomode *vm)
 226 {
 227         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 228         DBG("%s", omap_crtc->name);
 229         omap_crtc->vm = *vm;
 230 }
 231
 232 static void omap_crtc_dss_set_lcd_config(enum omap_channel channel,
 233                 const struct dss_lcd_mgr_config *config)
 234 {
 235         struct omap_crtc *omap_crtc = omap_crtcs[channel];
 236         DBG("%s", omap_crtc->name);
 237         dispc_mgr_set_lcd_config(omap_crtc->channel, config);
 238 }
 239
 240 static int omap_crtc_dss_register_framedone(
 241                 enum omap_channel channel,
 242                 void (*handler)(void *), void *data)
 243 {
 244         return 0;
 245 }
 246
 247 static void omap_crtc_dss_unregister_framedone(
 248                 enum omap_channel channel,
 249                 void (*handler)(void *), void *data)
 250 {
 251 }
 252
 253 static const struct dss_mgr_ops mgr_ops = {
 254         .connect = omap_crtc_dss_connect,
 255         .disconnect = omap_crtc_dss_disconnect,
 256         .start_update = omap_crtc_dss_start_update,
 257         .enable = omap_crtc_dss_enable,
 258         .disable = omap_crtc_dss_disable,
 259         .set_timings = omap_crtc_dss_set_timings,
 260         .set_lcd_config = omap_crtc_dss_set_lcd_config,
 261         .register_framedone_handler = omap_crtc_dss_register_framedone,
 262         .unregister_framedone_handler = omap_crtc_dss_unregister_framedone,
 263 };
 264
 265 /* -----------------------------------------------------------------------------
 266  * Setup, Flush and Page Flip
 267  */
 268
 269 void omap_crtc_error_irq(struct drm_crtc *crtc, uint32_t irqstatus)
 270 {
 271         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 272
 273         if (omap_crtc->ignore_digit_sync_lost) {
 274                 irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
 275                 if (!irqstatus)
 276                         return;
 277         }
 278
 279         DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
 280 }
 281
 282 void omap_crtc_vblank_irq(struct drm_crtc *crtc)
 283 {
 284         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 285         bool pending;
 286
 287         spin_lock(&crtc->dev->event_lock);
 288         /*
 289          * If the dispc is busy we're racing the flush operation. Try again on
 290          * the next vblank interrupt.
 291          */
 292         if (dispc_mgr_go_busy(omap_crtc->channel)) {
 293                 spin_unlock(&crtc->dev->event_lock);
 294                 return;
 295         }
 296
 297         /* Send the vblank event if one has been requested. */
 298         if (omap_crtc->event) {
 299                 drm_crtc_send_vblank_event(crtc, omap_crtc->event);
 300                 omap_crtc->event = NULL;
 301         }
 302
 303         pending = omap_crtc->pending;
 304         omap_crtc->pending = false;
 305         spin_unlock(&crtc->dev->event_lock);
 306
 307         if (pending)
 308                 drm_crtc_vblank_put(crtc);
 309
 310         /* Wake up omap_atomic_complete. */
 311         wake_up(&omap_crtc->pending_wait);
 312
 313         DBG("%s: apply done", omap_crtc->name);
 314 }
 315
 316 /* -----------------------------------------------------------------------------
 317  * CRTC Functions
 318  */
 319
 320 static void omap_crtc_destroy(struct drm_crtc *crtc)
 321 {
 322         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 323
 324         DBG("%s", omap_crtc->name);
 325
 326         drm_crtc_cleanup(crtc);
 327
 328         kfree(omap_crtc);
 329 }
 330
 331 static void omap_crtc_enable(struct drm_crtc *crtc)
 332 {
 333         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 334         int ret;
 335
 336         DBG("%s", omap_crtc->name);
 337
 338         spin_lock_irq(&crtc->dev->event_lock);
 339         drm_crtc_vblank_on(crtc);
 340         ret = drm_crtc_vblank_get(crtc);
 341         WARN_ON(ret != 0);
 342
 343         WARN_ON(omap_crtc->pending);
 344         omap_crtc->pending = true;
 345         spin_unlock_irq(&crtc->dev->event_lock);
 346 }
 347
 348 static void omap_crtc_disable(struct drm_crtc *crtc)
 349 {
 350         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 351
 352         DBG("%s", omap_crtc->name);
 353
 354         drm_crtc_vblank_off(crtc);
 355 }
 356
 357 static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 358 {
 359         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 360         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 361
 362         DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 363             omap_crtc->name, mode->base.id, mode->name,
 364             mode->vrefresh, mode->clock,
 365             mode->hdisplay, mode->hsync_start, mode->hsync_end, mode->htotal,
 366             mode->vdisplay, mode->vsync_start, mode->vsync_end, mode->vtotal,
 367             mode->type, mode->flags);
 368
 369         drm_display_mode_to_videomode(mode, &omap_crtc->vm);
 370         omap_crtc->vm.flags |= DISPLAY_FLAGS_DE_HIGH |
 371                                DISPLAY_FLAGS_PIXDATA_POSEDGE |
 372                                DISPLAY_FLAGS_SYNC_NEGEDGE;
 373 }
 374
 375 static int omap_crtc_atomic_check(struct drm_crtc *crtc,
 376                                 struct drm_crtc_state *state)
 377 {
 378         if (state->color_mgmt_changed && state->gamma_lut) {
 379                 uint length = state->gamma_lut->length /
 380                         sizeof(struct drm_color_lut);
 381
 382                 if (length < 2)
 383                         return -EINVAL;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static void omap_crtc_atomic_begin(struct drm_crtc *crtc,
 390                                    struct drm_crtc_state *old_crtc_state)
 391 {
 392 }
 393
 394 static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
 395                                    struct drm_crtc_state *old_crtc_state)
 396 {
 397         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 398         int ret;
 399
 400         if (crtc->state->color_mgmt_changed) {
 401                 struct drm_color_lut *lut = NULL;
 402                 uint length = 0;
 403
 404                 if (crtc->state->gamma_lut) {
 405                         lut = (struct drm_color_lut *)
 406                                 crtc->state->gamma_lut->data;
 407                         length = crtc->state->gamma_lut->length /
 408                                 sizeof(*lut);
 409                 }
 410                 dispc_mgr_set_gamma(omap_crtc->channel, lut, length);
 411         }
 412
 413         /* Only flush the CRTC if it is currently enabled. */
 414         if (!omap_crtc->enabled)
 415                 return;
 416
 417         DBG("%s: GO", omap_crtc->name);
 418
 419         ret = drm_crtc_vblank_get(crtc);
 420         WARN_ON(ret != 0);
 421
 422         spin_lock_irq(&crtc->dev->event_lock);
 423         dispc_mgr_go(omap_crtc->channel);
 424
 425         WARN_ON(omap_crtc->pending);
 426         omap_crtc->pending = true;
 427
 428         if (crtc->state->event)
 429                 omap_crtc->event = crtc->state->event;
 430         spin_unlock_irq(&crtc->dev->event_lock);
 431 }
 432
 433 static bool omap_crtc_is_plane_prop(struct drm_crtc *crtc,
 434         struct drm_property *property)
 435 {
 436         struct drm_device *dev = crtc->dev;
 437         struct omap_drm_private *priv = dev->dev_private;
 438
 439         return property == priv->zorder_prop ||
 440                 property == crtc->primary->rotation_property;
 441 }
 442
 443 static int omap_crtc_atomic_set_property(struct drm_crtc *crtc,
 444                                          struct drm_crtc_state *state,
 445                                          struct drm_property *property,
 446                                          uint64_t val)
 447 {
 448         if (omap_crtc_is_plane_prop(crtc, property)) {
 449                 struct drm_plane_state *plane_state;
 450                 struct drm_plane *plane = crtc->primary;
 451
 452                 /*
 453                  * Delegate property set to the primary plane. Get the plane
 454                  * state and set the property directly.
 455                  */
 456
 457                 plane_state = drm_atomic_get_plane_state(state->state, plane);
 458                 if (IS_ERR(plane_state))
 459                         return PTR_ERR(plane_state);
 460
 461                 return drm_atomic_plane_set_property(plane, plane_state,
 462                                 property, val);
 463         }
 464
 465         return -EINVAL;
 466 }
 467
 468 static int omap_crtc_atomic_get_property(struct drm_crtc *crtc,
 469                                          const struct drm_crtc_state *state,
 470                                          struct drm_property *property,
 471                                          uint64_t *val)
 472 {
 473         if (omap_crtc_is_plane_prop(crtc, property)) {
 474                 /*
 475                  * Delegate property get to the primary plane. The
 476                  * drm_atomic_plane_get_property() function isn't exported, but
 477                  * can be called through drm_object_property_get_value() as that
 478                  * will call drm_atomic_get_property() for atomic drivers.
 479                  */
 480                 return drm_object_property_get_value(&crtc->primary->base,
 481                                 property, val);
 482         }
 483
 484         return -EINVAL;
 485 }
 486
 487 static const struct drm_crtc_funcs omap_crtc_funcs = {
 488         .reset = drm_atomic_helper_crtc_reset,
 489         .set_config = drm_atomic_helper_set_config,
 490         .destroy = omap_crtc_destroy,
 491         .page_flip = drm_atomic_helper_page_flip,
 492         .gamma_set = drm_atomic_helper_legacy_gamma_set,
 493         .set_property = drm_atomic_helper_crtc_set_property,
 494         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 495         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 496         .atomic_set_property = omap_crtc_atomic_set_property,
 497         .atomic_get_property = omap_crtc_atomic_get_property,
 498         .enable_vblank = omap_irq_enable_vblank,
 499         .disable_vblank = omap_irq_disable_vblank,
 500 };
 501
 502 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 503         .mode_set_nofb = omap_crtc_mode_set_nofb,
 504         .disable = omap_crtc_disable,
 505         .enable = omap_crtc_enable,
 506         .atomic_check = omap_crtc_atomic_check,
 507         .atomic_begin = omap_crtc_atomic_begin,
 508         .atomic_flush = omap_crtc_atomic_flush,
 509 };
 510
 511 /* -----------------------------------------------------------------------------
 512  * Init and Cleanup
 513  */
 514
 515 static const char *channel_names[] = {
 516         [OMAP_DSS_CHANNEL_LCD] = "lcd",
 517         [OMAP_DSS_CHANNEL_DIGIT] = "tv",
 518         [OMAP_DSS_CHANNEL_LCD2] = "lcd2",
 519         [OMAP_DSS_CHANNEL_LCD3] = "lcd3",
 520 };
 521
 522 void omap_crtc_pre_init(void)
 523 {
 524         dss_install_mgr_ops(&mgr_ops);
 525 }
 526
 527 void omap_crtc_pre_uninit(void)
 528 {
 529         dss_uninstall_mgr_ops();
 530 }
 531
 532 /* initialize crtc */
 533 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 534                 struct drm_plane *plane, enum omap_channel channel, int id)
 535 {
 536         struct drm_crtc *crtc = NULL;
 537         struct omap_crtc *omap_crtc;
 538         int ret;
 539
 540         DBG("%s", channel_names[channel]);
 541
 542         omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 543         if (!omap_crtc)
 544                 return NULL;
 545
 546         crtc = &omap_crtc->base;
 547
 548         init_waitqueue_head(&omap_crtc->pending_wait);
 549
 550         omap_crtc->channel = channel;
 551         omap_crtc->name = channel_names[channel];
 552
 553         ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
 554                                         &omap_crtc_funcs, NULL);
 555         if (ret < 0) {
 556                 kfree(omap_crtc);
 557                 return NULL;
 558         }
 559
 560         drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 561
 562         /* The dispc API adapts to what ever size, but the HW supports
 563          * 256 element gamma table for LCDs and 1024 element table for
 564          * OMAP_DSS_CHANNEL_DIGIT. X server assumes 256 element gamma
 565          * tables so lets use that. Size of HW gamma table can be
 566          * extracted with dispc_mgr_gamma_size(). If it returns 0
 567          * gamma table is not supprted.
 568          */
 569         if (dispc_mgr_gamma_size(channel)) {
 570                 uint gamma_lut_size = 256;
 571
 572                 drm_crtc_enable_color_mgmt(crtc, 0, false, gamma_lut_size);
 573                 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
 574         }
 575
 576         omap_plane_install_properties(crtc->primary, &crtc->base);
 577
 578         omap_crtcs[channel] = omap_crtc;
 579
 580         return crtc;
 581 }