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         /*
  38          * Temporary: eventually this will go away, but it is needed
  39          * for now to keep the output's happy.  (They only need
  40          * mgr->id.)  Eventually this will be replaced w/ something
  41          * more common-panel-framework-y
  42          */
  43         struct omap_overlay_manager *mgr;
  44
  45         struct omap_video_timings timings;
  46
  47         struct omap_drm_irq vblank_irq;
  48         struct omap_drm_irq error_irq;
  49
  50         bool ignore_digit_sync_lost;
  51
  52         bool pending;
  53         wait_queue_head_t pending_wait;
  54 };
  55
  56 /* -----------------------------------------------------------------------------
  57  * Helper Functions
  58  */
  59
  60 uint32_t pipe2vbl(struct drm_crtc *crtc)
  61 {
  62         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  63
  64         return dispc_mgr_get_vsync_irq(omap_crtc->channel);
  65 }
  66
  67 struct omap_video_timings *omap_crtc_timings(struct drm_crtc *crtc)
  68 {
  69         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  70         return &omap_crtc->timings;
  71 }
  72
  73 enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
  74 {
  75         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  76         return omap_crtc->channel;
  77 }
  78
  79 int omap_crtc_wait_pending(struct drm_crtc *crtc)
  80 {
  81         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  82
  83         return wait_event_timeout(omap_crtc->pending_wait,
  84                                   !omap_crtc->pending,
  85                                   msecs_to_jiffies(50));
  86 }
  87
  88 /* -----------------------------------------------------------------------------
  89  * DSS Manager Functions
  90  */
  91
  92 /*
  93  * Manager-ops, callbacks from output when they need to configure
  94  * the upstream part of the video pipe.
  95  *
  96  * Most of these we can ignore until we add support for command-mode
  97  * panels.. for video-mode the crtc-helpers already do an adequate
  98  * job of sequencing the setup of the video pipe in the proper order
  99  */
 100
 101 /* ovl-mgr-id -> crtc */
 102 static struct omap_crtc *omap_crtcs[8];
 103
 104 /* we can probably ignore these until we support command-mode panels: */
 105 static int omap_crtc_dss_connect(struct omap_overlay_manager *mgr,
 106                 struct omap_dss_device *dst)
 107 {
 108         if (mgr->output)
 109                 return -EINVAL;
 110
 111         if ((mgr->supported_outputs & dst->id) == 0)
 112                 return -EINVAL;
 113
 114         dst->manager = mgr;
 115         mgr->output = dst;
 116
 117         return 0;
 118 }
 119
 120 static void omap_crtc_dss_disconnect(struct omap_overlay_manager *mgr,
 121                 struct omap_dss_device *dst)
 122 {
 123         mgr->output->manager = NULL;
 124         mgr->output = NULL;
 125 }
 126
 127 static void omap_crtc_dss_start_update(struct omap_overlay_manager *mgr)
 128 {
 129 }
 130
 131 /* Called only from the encoder enable/disable and suspend/resume handlers. */
 132 static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 133 {
 134         struct drm_device *dev = crtc->dev;
 135         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 136         enum omap_channel channel = omap_crtc->channel;
 137         struct omap_irq_wait *wait;
 138         u32 framedone_irq, vsync_irq;
 139         int ret;
 140
 141         if (dispc_mgr_is_enabled(channel) == enable)
 142                 return;
 143
 144         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 145                 /*
 146                  * Digit output produces some sync lost interrupts during the
 147                  * first frame when enabling, so we need to ignore those.
 148                  */
 149                 omap_crtc->ignore_digit_sync_lost = true;
 150         }
 151
 152         framedone_irq = dispc_mgr_get_framedone_irq(channel);
 153         vsync_irq = dispc_mgr_get_vsync_irq(channel);
 154
 155         if (enable) {
 156                 wait = omap_irq_wait_init(dev, vsync_irq, 1);
 157         } else {
 158                 /*
 159                  * When we disable the digit output, we need to wait for
 160                  * FRAMEDONE to know that DISPC has finished with the output.
 161                  *
 162                  * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
 163                  * that case we need to use vsync interrupt, and wait for both
 164                  * even and odd frames.
 165                  */
 166
 167                 if (framedone_irq)
 168                         wait = omap_irq_wait_init(dev, framedone_irq, 1);
 169                 else
 170                         wait = omap_irq_wait_init(dev, vsync_irq, 2);
 171         }
 172
 173         dispc_mgr_enable(channel, enable);
 174
 175         ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
 176         if (ret) {
 177                 dev_err(dev->dev, "%s: timeout waiting for %s\n",
 178                                 omap_crtc->name, enable ? "enable" : "disable");
 179         }
 180
 181         if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
 182                 omap_crtc->ignore_digit_sync_lost = false;
 183                 /* make sure the irq handler sees the value above */
 184                 mb();
 185         }
 186 }
 187
 188
 189 static int omap_crtc_dss_enable(struct omap_overlay_manager *mgr)
 190 {
 191         struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
 192         struct omap_overlay_manager_info info;
 193
 194         memset(&info, 0, sizeof(info));
 195         info.default_color = 0x00000000;
 196         info.trans_key = 0x00000000;
 197         info.trans_key_type = OMAP_DSS_COLOR_KEY_GFX_DST;
 198         info.trans_enabled = false;
 199
 200         dispc_mgr_setup(omap_crtc->channel, &info);
 201         dispc_mgr_set_timings(omap_crtc->channel,
 202                         &omap_crtc->timings);
 203         omap_crtc_set_enabled(&omap_crtc->base, true);
 204
 205         return 0;
 206 }
 207
 208 static void omap_crtc_dss_disable(struct omap_overlay_manager *mgr)
 209 {
 210         struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
 211
 212         omap_crtc_set_enabled(&omap_crtc->base, false);
 213 }
 214
 215 static void omap_crtc_dss_set_timings(struct omap_overlay_manager *mgr,
 216                 const struct omap_video_timings *timings)
 217 {
 218         struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
 219         DBG("%s", omap_crtc->name);
 220         omap_crtc->timings = *timings;
 221 }
 222
 223 static void omap_crtc_dss_set_lcd_config(struct omap_overlay_manager *mgr,
 224                 const struct dss_lcd_mgr_config *config)
 225 {
 226         struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
 227         DBG("%s", omap_crtc->name);
 228         dispc_mgr_set_lcd_config(omap_crtc->channel, config);
 229 }
 230
 231 static int omap_crtc_dss_register_framedone(
 232                 struct omap_overlay_manager *mgr,
 233                 void (*handler)(void *), void *data)
 234 {
 235         return 0;
 236 }
 237
 238 static void omap_crtc_dss_unregister_framedone(
 239                 struct omap_overlay_manager *mgr,
 240                 void (*handler)(void *), void *data)
 241 {
 242 }
 243
 244 static const struct dss_mgr_ops mgr_ops = {
 245         .connect = omap_crtc_dss_connect,
 246         .disconnect = omap_crtc_dss_disconnect,
 247         .start_update = omap_crtc_dss_start_update,
 248         .enable = omap_crtc_dss_enable,
 249         .disable = omap_crtc_dss_disable,
 250         .set_timings = omap_crtc_dss_set_timings,
 251         .set_lcd_config = omap_crtc_dss_set_lcd_config,
 252         .register_framedone_handler = omap_crtc_dss_register_framedone,
 253         .unregister_framedone_handler = omap_crtc_dss_unregister_framedone,
 254 };
 255
 256 /* -----------------------------------------------------------------------------
 257  * Setup, Flush and Page Flip
 258  */
 259
 260 static void omap_crtc_complete_page_flip(struct drm_crtc *crtc)
 261 {
 262         struct drm_pending_vblank_event *event;
 263         struct drm_device *dev = crtc->dev;
 264         unsigned long flags;
 265
 266         event = crtc->state->event;
 267
 268         if (!event)
 269                 return;
 270
 271         spin_lock_irqsave(&dev->event_lock, flags);
 272
 273         list_del(&event->base.link);
 274
 275         /*
 276          * Queue the event for delivery if it's still linked to a file
 277          * handle, otherwise just destroy it.
 278          */
 279         if (event->base.file_priv)
 280                 drm_crtc_send_vblank_event(crtc, event);
 281         else
 282                 event->base.destroy(&event->base);
 283
 284         spin_unlock_irqrestore(&dev->event_lock, flags);
 285 }
 286
 287 static void omap_crtc_error_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 288 {
 289         struct omap_crtc *omap_crtc =
 290                         container_of(irq, struct omap_crtc, error_irq);
 291
 292         if (omap_crtc->ignore_digit_sync_lost) {
 293                 irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
 294                 if (!irqstatus)
 295                         return;
 296         }
 297
 298         DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
 299 }
 300
 301 static void omap_crtc_vblank_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 302 {
 303         struct omap_crtc *omap_crtc =
 304                         container_of(irq, struct omap_crtc, vblank_irq);
 305         struct drm_device *dev = omap_crtc->base.dev;
 306
 307         if (dispc_mgr_go_busy(omap_crtc->channel))
 308                 return;
 309
 310         DBG("%s: apply done", omap_crtc->name);
 311
 312         __omap_irq_unregister(dev, &omap_crtc->vblank_irq);
 313
 314         rmb();
 315         WARN_ON(!omap_crtc->pending);
 316         omap_crtc->pending = false;
 317         wmb();
 318
 319         /* wake up userspace */
 320         omap_crtc_complete_page_flip(&omap_crtc->base);
 321
 322         /* wake up omap_atomic_complete */
 323         wake_up(&omap_crtc->pending_wait);
 324 }
 325
 326 /* -----------------------------------------------------------------------------
 327  * CRTC Functions
 328  */
 329
 330 static void omap_crtc_destroy(struct drm_crtc *crtc)
 331 {
 332         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 333
 334         DBG("%s", omap_crtc->name);
 335
 336         WARN_ON(omap_crtc->vblank_irq.registered);
 337         omap_irq_unregister(crtc->dev, &omap_crtc->error_irq);
 338
 339         drm_crtc_cleanup(crtc);
 340
 341         kfree(omap_crtc);
 342 }
 343
 344 static bool omap_crtc_mode_fixup(struct drm_crtc *crtc,
 345                 const struct drm_display_mode *mode,
 346                 struct drm_display_mode *adjusted_mode)
 347 {
 348         return true;
 349 }
 350
 351 static void omap_crtc_enable(struct drm_crtc *crtc)
 352 {
 353         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 354
 355         DBG("%s", omap_crtc->name);
 356
 357         rmb();
 358         WARN_ON(omap_crtc->pending);
 359         omap_crtc->pending = true;
 360         wmb();
 361
 362         omap_irq_register(crtc->dev, &omap_crtc->vblank_irq);
 363
 364         drm_crtc_vblank_on(crtc);
 365 }
 366
 367 static void omap_crtc_disable(struct drm_crtc *crtc)
 368 {
 369         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 370
 371         DBG("%s", omap_crtc->name);
 372
 373         drm_crtc_vblank_off(crtc);
 374 }
 375
 376 static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 377 {
 378         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 379         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 380
 381         DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 382             omap_crtc->name, mode->base.id, mode->name,
 383             mode->vrefresh, mode->clock,
 384             mode->hdisplay, mode->hsync_start, mode->hsync_end, mode->htotal,
 385             mode->vdisplay, mode->vsync_start, mode->vsync_end, mode->vtotal,
 386             mode->type, mode->flags);
 387
 388         copy_timings_drm_to_omap(&omap_crtc->timings, mode);
 389 }
 390
 391 static void omap_crtc_atomic_begin(struct drm_crtc *crtc,
 392                                   struct drm_crtc_state *old_crtc_state)
 393 {
 394 }
 395
 396 static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
 397                                   struct drm_crtc_state *old_crtc_state)
 398 {
 399         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 400
 401         WARN_ON(omap_crtc->vblank_irq.registered);
 402
 403         if (dispc_mgr_is_enabled(omap_crtc->channel)) {
 404
 405                 DBG("%s: GO", omap_crtc->name);
 406
 407                 rmb();
 408                 WARN_ON(omap_crtc->pending);
 409                 omap_crtc->pending = true;
 410                 wmb();
 411
 412                 dispc_mgr_go(omap_crtc->channel);
 413                 omap_irq_register(crtc->dev, &omap_crtc->vblank_irq);
 414         }
 415
 416         crtc->invert_dimensions = !!(crtc->primary->state->rotation &
 417                                     (BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270)));
 418 }
 419
 420 static int omap_crtc_atomic_set_property(struct drm_crtc *crtc,
 421                                          struct drm_crtc_state *state,
 422                                          struct drm_property *property,
 423                                          uint64_t val)
 424 {
 425         struct drm_plane_state *plane_state;
 426         struct drm_plane *plane = crtc->primary;
 427
 428         /*
 429          * Delegate property set to the primary plane. Get the plane state and
 430          * set the property directly.
 431          */
 432
 433         plane_state = drm_atomic_get_plane_state(state->state, plane);
 434         if (!plane_state)
 435                 return -EINVAL;
 436
 437         return drm_atomic_plane_set_property(plane, plane_state, property, val);
 438 }
 439
 440 static int omap_crtc_atomic_get_property(struct drm_crtc *crtc,
 441                                          const struct drm_crtc_state *state,
 442                                          struct drm_property *property,
 443                                          uint64_t *val)
 444 {
 445         /*
 446          * Delegate property get to the primary plane. The
 447          * drm_atomic_plane_get_property() function isn't exported, but can be
 448          * called through drm_object_property_get_value() as that will call
 449          * drm_atomic_get_property() for atomic drivers.
 450          */
 451         return drm_object_property_get_value(&crtc->primary->base, property,
 452                                              val);
 453 }
 454
 455 static const struct drm_crtc_funcs omap_crtc_funcs = {
 456         .reset = drm_atomic_helper_crtc_reset,
 457         .set_config = drm_atomic_helper_set_config,
 458         .destroy = omap_crtc_destroy,
 459         .page_flip = drm_atomic_helper_page_flip,
 460         .set_property = drm_atomic_helper_crtc_set_property,
 461         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 462         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 463         .atomic_set_property = omap_crtc_atomic_set_property,
 464         .atomic_get_property = omap_crtc_atomic_get_property,
 465 };
 466
 467 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 468         .mode_fixup = omap_crtc_mode_fixup,
 469         .mode_set_nofb = omap_crtc_mode_set_nofb,
 470         .disable = omap_crtc_disable,
 471         .enable = omap_crtc_enable,
 472         .atomic_begin = omap_crtc_atomic_begin,
 473         .atomic_flush = omap_crtc_atomic_flush,
 474 };
 475
 476 /* -----------------------------------------------------------------------------
 477  * Init and Cleanup
 478  */
 479
 480 static const char *channel_names[] = {
 481         [OMAP_DSS_CHANNEL_LCD] = "lcd",
 482         [OMAP_DSS_CHANNEL_DIGIT] = "tv",
 483         [OMAP_DSS_CHANNEL_LCD2] = "lcd2",
 484         [OMAP_DSS_CHANNEL_LCD3] = "lcd3",
 485 };
 486
 487 void omap_crtc_pre_init(void)
 488 {
 489         dss_install_mgr_ops(&mgr_ops);
 490 }
 491
 492 void omap_crtc_pre_uninit(void)
 493 {
 494         dss_uninstall_mgr_ops();
 495 }
 496
 497 /* initialize crtc */
 498 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 499                 struct drm_plane *plane, enum omap_channel channel, int id)
 500 {
 501         struct drm_crtc *crtc = NULL;
 502         struct omap_crtc *omap_crtc;
 503         int ret;
 504
 505         DBG("%s", channel_names[channel]);
 506
 507         omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 508         if (!omap_crtc)
 509                 return NULL;
 510
 511         crtc = &omap_crtc->base;
 512
 513         init_waitqueue_head(&omap_crtc->pending_wait);
 514
 515         omap_crtc->channel = channel;
 516         omap_crtc->name = channel_names[channel];
 517
 518         omap_crtc->vblank_irq.irqmask = pipe2vbl(crtc);
 519         omap_crtc->vblank_irq.irq = omap_crtc_vblank_irq;
 520
 521         omap_crtc->error_irq.irqmask =
 522                         dispc_mgr_get_sync_lost_irq(channel);
 523         omap_crtc->error_irq.irq = omap_crtc_error_irq;
 524         omap_irq_register(dev, &omap_crtc->error_irq);
 525
 526         /* temporary: */
 527         omap_crtc->mgr = omap_dss_get_overlay_manager(channel);
 528
 529         ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
 530                                         &omap_crtc_funcs);
 531         if (ret < 0) {
 532                 kfree(omap_crtc);
 533                 return NULL;
 534         }
 535
 536         drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 537
 538         omap_plane_install_properties(crtc->primary, &crtc->base);
 539
 540         omap_crtcs[channel] = omap_crtc;
 541
 542         return crtc;
 543 }