drivers/staging/omapdrm/omap_plane.c

   1 /*
   2  * drivers/staging/omapdrm/omap_plane.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob.clark@linaro.org>
   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 <linux/kfifo.h>
  21
  22 #include "omap_drv.h"
  23
  24 /* some hackery because omapdss has an 'enum omap_plane' (which would be
  25  * better named omap_plane_id).. and compiler seems unhappy about having
  26  * both a 'struct omap_plane' and 'enum omap_plane'
  27  */
  28 #define omap_plane _omap_plane
  29
  30 /*
  31  * plane funcs
  32  */
  33
  34 struct callback {
  35         void (*fxn)(void *);
  36         void *arg;
  37 };
  38
  39 #define to_omap_plane(x) container_of(x, struct omap_plane, base)
  40
  41 struct omap_plane {
  42         struct drm_plane base;
  43         struct omap_overlay *ovl;
  44         struct omap_overlay_info info;
  45
  46         /* Source values, converted to integers because we don't support
  47          * fractional positions:
  48          */
  49         unsigned int src_x, src_y;
  50
  51         /* last fb that we pinned: */
  52         struct drm_framebuffer *pinned_fb;
  53
  54         uint32_t nformats;
  55         uint32_t formats[32];
  56
  57         /* for synchronizing access to unpins fifo */
  58         struct mutex unpin_mutex;
  59
  60         /* set of bo's pending unpin until next END_WIN irq */
  61         DECLARE_KFIFO_PTR(unpin_fifo, struct drm_gem_object *);
  62         int num_unpins, pending_num_unpins;
  63
  64         /* for deferred unpin when we need to wait for scanout complete irq */
  65         struct work_struct work;
  66
  67         /* callback on next endwin irq */
  68         struct callback endwin;
  69 };
  70
  71 /* map from ovl->id to the irq we are interested in for scanout-done */
  72 static const uint32_t id2irq[] = {
  73                 [OMAP_DSS_GFX]    = DISPC_IRQ_GFX_END_WIN,
  74                 [OMAP_DSS_VIDEO1] = DISPC_IRQ_VID1_END_WIN,
  75                 [OMAP_DSS_VIDEO2] = DISPC_IRQ_VID2_END_WIN,
  76                 [OMAP_DSS_VIDEO3] = DISPC_IRQ_VID3_END_WIN,
  77 };
  78
  79 static void dispc_isr(void *arg, uint32_t mask)
  80 {
  81         struct drm_plane *plane = arg;
  82         struct omap_plane *omap_plane = to_omap_plane(plane);
  83         struct omap_drm_private *priv = plane->dev->dev_private;
  84
  85         omap_dispc_unregister_isr(dispc_isr, plane,
  86                         id2irq[omap_plane->ovl->id]);
  87
  88         queue_work(priv->wq, &omap_plane->work);
  89 }
  90
  91 static void unpin_worker(struct work_struct *work)
  92 {
  93         struct omap_plane *omap_plane =
  94                         container_of(work, struct omap_plane, work);
  95         struct callback endwin;
  96
  97         mutex_lock(&omap_plane->unpin_mutex);
  98         DBG("unpinning %d of %d", omap_plane->num_unpins,
  99                         omap_plane->num_unpins + omap_plane->pending_num_unpins);
 100         while (omap_plane->num_unpins > 0) {
 101                 struct drm_gem_object *bo = NULL;
 102                 int ret = kfifo_get(&omap_plane->unpin_fifo, &bo);
 103                 WARN_ON(!ret);
 104                 omap_gem_put_paddr(bo);
 105                 drm_gem_object_unreference_unlocked(bo);
 106                 omap_plane->num_unpins--;
 107         }
 108         endwin = omap_plane->endwin;
 109         omap_plane->endwin.fxn = NULL;
 110         mutex_unlock(&omap_plane->unpin_mutex);
 111
 112         if (endwin.fxn)
 113                 endwin.fxn(endwin.arg);
 114 }
 115
 116 static void install_irq(struct drm_plane *plane)
 117 {
 118         struct omap_plane *omap_plane = to_omap_plane(plane);
 119         struct omap_overlay *ovl = omap_plane->ovl;
 120         int ret;
 121
 122         ret = omap_dispc_register_isr(dispc_isr, plane, id2irq[ovl->id]);
 123
 124         /*
 125          * omapdss has upper limit on # of registered irq handlers,
 126          * which we shouldn't hit.. but if we do the limit should
 127          * be raised or bad things happen:
 128          */
 129         WARN_ON(ret == -EBUSY);
 130 }
 131
 132 /* push changes down to dss2 */
 133 static int commit(struct drm_plane *plane)
 134 {
 135         struct drm_device *dev = plane->dev;
 136         struct omap_plane *omap_plane = to_omap_plane(plane);
 137         struct omap_overlay *ovl = omap_plane->ovl;
 138         struct omap_overlay_info *info = &omap_plane->info;
 139         int ret;
 140
 141         DBG("%s", ovl->name);
 142         DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
 143                         info->out_height, info->screen_width);
 144         DBG("%d,%d %08x %08x", info->pos_x, info->pos_y,
 145                         info->paddr, info->p_uv_addr);
 146
 147         /* NOTE: do we want to do this at all here, or just wait
 148          * for dpms(ON) since other CRTC's may not have their mode
 149          * set yet, so fb dimensions may still change..
 150          */
 151         ret = ovl->set_overlay_info(ovl, info);
 152         if (ret) {
 153                 dev_err(dev->dev, "could not set overlay info\n");
 154                 return ret;
 155         }
 156
 157         mutex_lock(&omap_plane->unpin_mutex);
 158         omap_plane->num_unpins += omap_plane->pending_num_unpins;
 159         omap_plane->pending_num_unpins = 0;
 160         mutex_unlock(&omap_plane->unpin_mutex);
 161
 162         /* our encoder doesn't necessarily get a commit() after this, in
 163          * particular in the dpms() and mode_set_base() cases, so force the
 164          * manager to update:
 165          *
 166          * could this be in the encoder somehow?
 167          */
 168         if (ovl->manager) {
 169                 ret = ovl->manager->apply(ovl->manager);
 170                 if (ret) {
 171                         dev_err(dev->dev, "could not apply settings\n");
 172                         return ret;
 173                 }
 174
 175                 /*
 176                  * NOTE: really this should be atomic w/ mgr->apply() but
 177                  * omapdss does not expose such an API
 178                  */
 179                 if (omap_plane->num_unpins > 0)
 180                         install_irq(plane);
 181
 182         } else {
 183                 struct omap_drm_private *priv = dev->dev_private;
 184                 queue_work(priv->wq, &omap_plane->work);
 185         }
 186
 187
 188         if (ovl->is_enabled(ovl)) {
 189                 omap_framebuffer_flush(plane->fb, info->pos_x, info->pos_y,
 190                                 info->out_width, info->out_height);
 191         }
 192
 193         return 0;
 194 }
 195
 196 /* when CRTC that we are attached to has potentially changed, this checks
 197  * if we are attached to proper manager, and if necessary updates.
 198  */
 199 static void update_manager(struct drm_plane *plane)
 200 {
 201         struct omap_drm_private *priv = plane->dev->dev_private;
 202         struct omap_plane *omap_plane = to_omap_plane(plane);
 203         struct omap_overlay *ovl = omap_plane->ovl;
 204         struct omap_overlay_manager *mgr = NULL;
 205         int i;
 206
 207         if (plane->crtc) {
 208                 for (i = 0; i < priv->num_encoders; i++) {
 209                         struct drm_encoder *encoder = priv->encoders[i];
 210                         if (encoder->crtc == plane->crtc) {
 211                                 mgr = omap_encoder_get_manager(encoder);
 212                                 break;
 213                         }
 214                 }
 215         }
 216
 217         if (ovl->manager != mgr) {
 218                 bool enabled = ovl->is_enabled(ovl);
 219
 220                 /* don't switch things around with enabled overlays: */
 221                 if (enabled)
 222                         omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 223
 224                 if (ovl->manager) {
 225                         DBG("disconnecting %s from %s", ovl->name,
 226                                         ovl->manager->name);
 227                         ovl->unset_manager(ovl);
 228                 }
 229
 230                 if (mgr) {
 231                         DBG("connecting %s to %s", ovl->name, mgr->name);
 232                         ovl->set_manager(ovl, mgr);
 233                 }
 234
 235                 if (enabled && mgr)
 236                         omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
 237         }
 238 }
 239
 240 static void unpin(void *arg, struct drm_gem_object *bo)
 241 {
 242         struct drm_plane *plane = arg;
 243         struct omap_plane *omap_plane = to_omap_plane(plane);
 244
 245         if (kfifo_put(&omap_plane->unpin_fifo,
 246                         (const struct drm_gem_object **)&bo)) {
 247                 omap_plane->pending_num_unpins++;
 248                 /* also hold a ref so it isn't free'd while pinned */
 249                 drm_gem_object_reference(bo);
 250         } else {
 251                 dev_err(plane->dev->dev, "unpin fifo full!\n");
 252                 omap_gem_put_paddr(bo);
 253         }
 254 }
 255
 256 /* update which fb (if any) is pinned for scanout */
 257 static int update_pin(struct drm_plane *plane, struct drm_framebuffer *fb)
 258 {
 259         struct omap_plane *omap_plane = to_omap_plane(plane);
 260         struct drm_framebuffer *pinned_fb = omap_plane->pinned_fb;
 261
 262         if (pinned_fb != fb) {
 263                 int ret;
 264
 265                 DBG("%p -> %p", pinned_fb, fb);
 266
 267                 mutex_lock(&omap_plane->unpin_mutex);
 268                 ret = omap_framebuffer_replace(pinned_fb, fb, plane, unpin);
 269                 mutex_unlock(&omap_plane->unpin_mutex);
 270
 271                 if (ret) {
 272                         dev_err(plane->dev->dev, "could not swap %p -> %p\n",
 273                                         omap_plane->pinned_fb, fb);
 274                         omap_plane->pinned_fb = NULL;
 275                         return ret;
 276                 }
 277
 278                 omap_plane->pinned_fb = fb;
 279         }
 280
 281         return 0;
 282 }
 283
 284 /* update parameters that are dependent on the framebuffer dimensions and
 285  * position within the fb that this plane scans out from. This is called
 286  * when framebuffer or x,y base may have changed.
 287  */
 288 static void update_scanout(struct drm_plane *plane)
 289 {
 290         struct omap_plane *omap_plane = to_omap_plane(plane);
 291         struct omap_overlay_info *info = &omap_plane->info;
 292         int ret;
 293
 294         ret = update_pin(plane, plane->fb);
 295         if (ret) {
 296                 dev_err(plane->dev->dev,
 297                         "could not pin fb: %d\n", ret);
 298                 omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 299                 return;
 300         }
 301
 302         omap_framebuffer_update_scanout(plane->fb,
 303                         omap_plane->src_x, omap_plane->src_y, info);
 304
 305         DBG("%s: %d,%d: %08x %08x (%d)", omap_plane->ovl->name,
 306                         omap_plane->src_x, omap_plane->src_y,
 307                         (u32)info->paddr, (u32)info->p_uv_addr,
 308                         info->screen_width);
 309 }
 310
 311 int omap_plane_mode_set(struct drm_plane *plane,
 312                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
 313                 int crtc_x, int crtc_y,
 314                 unsigned int crtc_w, unsigned int crtc_h,
 315                 uint32_t src_x, uint32_t src_y,
 316                 uint32_t src_w, uint32_t src_h)
 317 {
 318         struct omap_plane *omap_plane = to_omap_plane(plane);
 319
 320         /* src values are in Q16 fixed point, convert to integer: */
 321         src_x = src_x >> 16;
 322         src_y = src_y >> 16;
 323         src_w = src_w >> 16;
 324         src_h = src_h >> 16;
 325
 326         omap_plane->info.pos_x = crtc_x;
 327         omap_plane->info.pos_y = crtc_y;
 328         omap_plane->info.out_width = crtc_w;
 329         omap_plane->info.out_height = crtc_h;
 330         omap_plane->info.width = src_w;
 331         omap_plane->info.height = src_h;
 332         omap_plane->src_x = src_x;
 333         omap_plane->src_y = src_y;
 334
 335         /* note: this is done after this fxn returns.. but if we need
 336          * to do a commit/update_scanout, etc before this returns we
 337          * need the current value.
 338          */
 339         plane->fb = fb;
 340         plane->crtc = crtc;
 341
 342         update_scanout(plane);
 343         update_manager(plane);
 344
 345         return 0;
 346 }
 347
 348 static int omap_plane_update(struct drm_plane *plane,
 349                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
 350                 int crtc_x, int crtc_y,
 351                 unsigned int crtc_w, unsigned int crtc_h,
 352                 uint32_t src_x, uint32_t src_y,
 353                 uint32_t src_w, uint32_t src_h)
 354 {
 355         omap_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y, crtc_w, crtc_h,
 356                         src_x, src_y, src_w, src_h);
 357         return omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
 358 }
 359
 360 static int omap_plane_disable(struct drm_plane *plane)
 361 {
 362         return omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 363 }
 364
 365 static void omap_plane_destroy(struct drm_plane *plane)
 366 {
 367         struct omap_plane *omap_plane = to_omap_plane(plane);
 368         DBG("%s", omap_plane->ovl->name);
 369         omap_plane_disable(plane);
 370         drm_plane_cleanup(plane);
 371         WARN_ON(omap_plane->pending_num_unpins + omap_plane->num_unpins > 0);
 372         kfifo_free(&omap_plane->unpin_fifo);
 373         kfree(omap_plane);
 374 }
 375
 376 int omap_plane_dpms(struct drm_plane *plane, int mode)
 377 {
 378         struct omap_plane *omap_plane = to_omap_plane(plane);
 379         struct omap_overlay *ovl = omap_plane->ovl;
 380         int r;
 381
 382         DBG("%s: %d", omap_plane->ovl->name, mode);
 383
 384         if (mode == DRM_MODE_DPMS_ON) {
 385                 update_scanout(plane);
 386                 r = commit(plane);
 387                 if (!r)
 388                         r = ovl->enable(ovl);
 389         } else {
 390                 struct omap_drm_private *priv = plane->dev->dev_private;
 391                 r = ovl->disable(ovl);
 392                 update_pin(plane, NULL);
 393                 queue_work(priv->wq, &omap_plane->work);
 394         }
 395
 396         return r;
 397 }
 398
 399 void omap_plane_on_endwin(struct drm_plane *plane,
 400                 void (*fxn)(void *), void *arg)
 401 {
 402         struct omap_plane *omap_plane = to_omap_plane(plane);
 403
 404         mutex_lock(&omap_plane->unpin_mutex);
 405         omap_plane->endwin.fxn = fxn;
 406         omap_plane->endwin.arg = arg;
 407         mutex_unlock(&omap_plane->unpin_mutex);
 408
 409         install_irq(plane);
 410 }
 411
 412 static const struct drm_plane_funcs omap_plane_funcs = {
 413                 .update_plane = omap_plane_update,
 414                 .disable_plane = omap_plane_disable,
 415                 .destroy = omap_plane_destroy,
 416 };
 417
 418 /* initialize plane */
 419 struct drm_plane *omap_plane_init(struct drm_device *dev,
 420                 struct omap_overlay *ovl, unsigned int possible_crtcs,
 421                 bool priv)
 422 {
 423         struct drm_plane *plane = NULL;
 424         struct omap_plane *omap_plane;
 425         int ret;
 426
 427         DBG("%s: possible_crtcs=%08x, priv=%d", ovl->name,
 428                         possible_crtcs, priv);
 429
 430         /* friendly reminder to update table for future hw: */
 431         WARN_ON(ovl->id >= ARRAY_SIZE(id2irq));
 432
 433         omap_plane = kzalloc(sizeof(*omap_plane), GFP_KERNEL);
 434         if (!omap_plane) {
 435                 dev_err(dev->dev, "could not allocate plane\n");
 436                 goto fail;
 437         }
 438
 439         mutex_init(&omap_plane->unpin_mutex);
 440
 441         ret = kfifo_alloc(&omap_plane->unpin_fifo, 16, GFP_KERNEL);
 442         if (ret) {
 443                 dev_err(dev->dev, "could not allocate unpin FIFO\n");
 444                 goto fail;
 445         }
 446
 447         INIT_WORK(&omap_plane->work, unpin_worker);
 448
 449         omap_plane->nformats = omap_framebuffer_get_formats(
 450                         omap_plane->formats, ARRAY_SIZE(omap_plane->formats),
 451                         ovl->supported_modes);
 452         omap_plane->ovl = ovl;
 453         plane = &omap_plane->base;
 454
 455         drm_plane_init(dev, plane, possible_crtcs, &omap_plane_funcs,
 456                         omap_plane->formats, omap_plane->nformats, priv);
 457
 458         /* get our starting configuration, set defaults for parameters
 459          * we don't currently use, etc:
 460          */
 461         ovl->get_overlay_info(ovl, &omap_plane->info);
 462         omap_plane->info.rotation_type = OMAP_DSS_ROT_DMA;
 463         omap_plane->info.rotation = OMAP_DSS_ROT_0;
 464         omap_plane->info.global_alpha = 0xff;
 465         omap_plane->info.mirror = 0;
 466         omap_plane->info.mirror = 0;
 467
 468         /* Set defaults depending on whether we are a CRTC or overlay
 469          * layer.
 470          * TODO add ioctl to give userspace an API to change this.. this
 471          * will come in a subsequent patch.
 472          */
 473         if (priv)
 474                 omap_plane->info.zorder = 0;
 475         else
 476                 omap_plane->info.zorder = ovl->id;
 477
 478         update_manager(plane);
 479
 480         return plane;
 481
 482 fail:
 483         if (plane) {
 484                 omap_plane_destroy(plane);
 485         }
 486         return NULL;
 487 }