drivers/gpu/drm/sti/sti_drm_crtc.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
   4  *          Fabien Dessenne <fabien.dessenne@st.com>
   5  *          for STMicroelectronics.
   6  * License terms:  GNU General Public License (GPL), version 2
   7  */
   8
   9 #include <linux/clk.h>
  10
  11 #include <drm/drmP.h>
  12 #include <drm/drm_crtc_helper.h>
  13 #include <drm/drm_plane_helper.h>
  14
  15 #include "sti_compositor.h"
  16 #include "sti_drm_drv.h"
  17 #include "sti_drm_crtc.h"
  18 #include "sti_vtg.h"
  19
  20 static void sti_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
  21 {
  22         DRM_DEBUG_KMS("\n");
  23 }
  24
  25 static void sti_drm_crtc_prepare(struct drm_crtc *crtc)
  26 {
  27         struct sti_mixer *mixer = to_sti_mixer(crtc);
  28         struct device *dev = mixer->dev;
  29         struct sti_compositor *compo = dev_get_drvdata(dev);
  30
  31         compo->enable = true;
  32
  33         /* Prepare and enable the compo IP clock */
  34         if (mixer->id == STI_MIXER_MAIN) {
  35                 if (clk_prepare_enable(compo->clk_compo_main))
  36                         DRM_INFO("Failed to prepare/enable compo_main clk\n");
  37         } else {
  38                 if (clk_prepare_enable(compo->clk_compo_aux))
  39                         DRM_INFO("Failed to prepare/enable compo_aux clk\n");
  40         }
  41
  42         sti_mixer_clear_all_layers(mixer);
  43 }
  44
  45 static void sti_drm_crtc_commit(struct drm_crtc *crtc)
  46 {
  47         struct sti_mixer *mixer = to_sti_mixer(crtc);
  48         struct device *dev = mixer->dev;
  49         struct sti_compositor *compo = dev_get_drvdata(dev);
  50         struct sti_layer *layer;
  51
  52         if ((!mixer || !compo)) {
  53                 DRM_ERROR("Can not find mixer or compositor)\n");
  54                 return;
  55         }
  56
  57         /* get GDP which is reserved to the CRTC FB */
  58         layer = to_sti_layer(crtc->primary);
  59         if (layer)
  60                 sti_layer_commit(layer);
  61         else
  62                 DRM_ERROR("Can not find CRTC dedicated plane (GDP0)\n");
  63
  64         /* Enable layer on mixer */
  65         if (sti_mixer_set_layer_status(mixer, layer, true))
  66                 DRM_ERROR("Can not enable layer at mixer\n");
  67 }
  68
  69 static bool sti_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  70                                     const struct drm_display_mode *mode,
  71                                     struct drm_display_mode *adjusted_mode)
  72 {
  73         /* accept the provided drm_display_mode, do not fix it up */
  74         return true;
  75 }
  76
  77 static int
  78 sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
  79                       struct drm_display_mode *adjusted_mode, int x, int y,
  80                       struct drm_framebuffer *old_fb)
  81 {
  82         struct sti_mixer *mixer = to_sti_mixer(crtc);
  83         struct device *dev = mixer->dev;
  84         struct sti_compositor *compo = dev_get_drvdata(dev);
  85         struct sti_layer *layer;
  86         struct clk *clk;
  87         int rate = mode->clock * 1000;
  88         int res;
  89         unsigned int w, h;
  90
  91         DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d mode:%d (%s)\n",
  92                       crtc->base.id, sti_mixer_to_str(mixer),
  93                       crtc->primary->fb->base.id, mode->base.id, mode->name);
  94
  95         DRM_DEBUG_KMS("%d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
  96                       mode->vrefresh, mode->clock,
  97                       mode->hdisplay,
  98                       mode->hsync_start, mode->hsync_end,
  99                       mode->htotal,
 100                       mode->vdisplay,
 101                       mode->vsync_start, mode->vsync_end,
 102                       mode->vtotal, mode->type, mode->flags);
 103
 104         /* Set rate and prepare/enable pixel clock */
 105         if (mixer->id == STI_MIXER_MAIN)
 106                 clk = compo->clk_pix_main;
 107         else
 108                 clk = compo->clk_pix_aux;
 109
 110         res = clk_set_rate(clk, rate);
 111         if (res < 0) {
 112                 DRM_ERROR("Cannot set rate (%dHz) for pix clk\n", rate);
 113                 return -EINVAL;
 114         }
 115         if (clk_prepare_enable(clk)) {
 116                 DRM_ERROR("Failed to prepare/enable pix clk\n");
 117                 return -EINVAL;
 118         }
 119
 120         sti_vtg_set_config(mixer->id == STI_MIXER_MAIN ?
 121                         compo->vtg_main : compo->vtg_aux, &crtc->mode);
 122
 123         /* a GDP is reserved to the CRTC FB */
 124         layer = to_sti_layer(crtc->primary);
 125         if (!layer) {
 126                 DRM_ERROR("Can not find GDP0)\n");
 127                 return -EINVAL;
 128         }
 129
 130         /* copy the mode data adjusted by mode_fixup() into crtc->mode
 131          * so that hardware can be set to proper mode
 132          */
 133         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 134
 135         res = sti_mixer_set_layer_depth(mixer, layer);
 136         if (res) {
 137                 DRM_ERROR("Can not set layer depth\n");
 138                 return -EINVAL;
 139         }
 140         res = sti_mixer_active_video_area(mixer, &crtc->mode);
 141         if (res) {
 142                 DRM_ERROR("Can not set active video area\n");
 143                 return -EINVAL;
 144         }
 145
 146         w = crtc->primary->fb->width - x;
 147         h = crtc->primary->fb->height - y;
 148
 149         return sti_layer_prepare(layer, crtc->primary->fb, &crtc->mode,
 150                         mixer->id, 0, 0, w, h, x, y, w, h);
 151 }
 152
 153 static int sti_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 154                                       struct drm_framebuffer *old_fb)
 155 {
 156         struct sti_mixer *mixer = to_sti_mixer(crtc);
 157         struct sti_layer *layer;
 158         unsigned int w, h;
 159         int ret;
 160
 161         DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d (%d,%d)\n",
 162                       crtc->base.id, sti_mixer_to_str(mixer),
 163                       crtc->primary->fb->base.id, x, y);
 164
 165         /* GDP is reserved to the CRTC FB */
 166         layer = to_sti_layer(crtc->primary);
 167         if (!layer) {
 168                 DRM_ERROR("Can not find GDP0)\n");
 169                 ret = -EINVAL;
 170                 goto out;
 171         }
 172
 173         w = crtc->primary->fb->width - crtc->x;
 174         h = crtc->primary->fb->height - crtc->y;
 175
 176         ret = sti_layer_prepare(layer, crtc->primary->fb, &crtc->mode,
 177                                 mixer->id, 0, 0, w, h,
 178                                 crtc->x, crtc->y, w, h);
 179         if (ret) {
 180                 DRM_ERROR("Can not prepare layer\n");
 181                 goto out;
 182         }
 183
 184         sti_drm_crtc_commit(crtc);
 185 out:
 186         return ret;
 187 }
 188
 189 static void sti_drm_crtc_load_lut(struct drm_crtc *crtc)
 190 {
 191         /* do nothing */
 192 }
 193
 194 static void sti_drm_crtc_disable(struct drm_crtc *crtc)
 195 {
 196         struct sti_mixer *mixer = to_sti_mixer(crtc);
 197         struct device *dev = mixer->dev;
 198         struct sti_compositor *compo = dev_get_drvdata(dev);
 199         struct sti_layer *layer;
 200
 201         if (!compo->enable)
 202                 return;
 203
 204         DRM_DEBUG_KMS("CRTC:%d (%s)\n", crtc->base.id, sti_mixer_to_str(mixer));
 205
 206         /* Disable Background */
 207         sti_mixer_set_background_status(mixer, false);
 208
 209         /* Disable GDP */
 210         layer = to_sti_layer(crtc->primary);
 211         if (!layer) {
 212                 DRM_ERROR("Cannot find GDP0\n");
 213                 return;
 214         }
 215
 216         /* Disable layer at mixer level */
 217         if (sti_mixer_set_layer_status(mixer, layer, false))
 218                 DRM_ERROR("Can not disable %s layer at mixer\n",
 219                                 sti_layer_to_str(layer));
 220
 221         /* Wait a while to be sure that a Vsync event is received */
 222         msleep(WAIT_NEXT_VSYNC_MS);
 223
 224         /* Then disable layer itself */
 225         sti_layer_disable(layer);
 226
 227         drm_vblank_off(crtc->dev, mixer->id);
 228
 229         /* Disable pixel clock and compo IP clocks */
 230         if (mixer->id == STI_MIXER_MAIN) {
 231                 clk_disable_unprepare(compo->clk_pix_main);
 232                 clk_disable_unprepare(compo->clk_compo_main);
 233         } else {
 234                 clk_disable_unprepare(compo->clk_pix_aux);
 235                 clk_disable_unprepare(compo->clk_compo_aux);
 236         }
 237
 238         compo->enable = false;
 239 }
 240
 241 static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
 242         .dpms = sti_drm_crtc_dpms,
 243         .prepare = sti_drm_crtc_prepare,
 244         .commit = sti_drm_crtc_commit,
 245         .mode_fixup = sti_drm_crtc_mode_fixup,
 246         .mode_set = sti_drm_crtc_mode_set,
 247         .mode_set_base = sti_drm_crtc_mode_set_base,
 248         .load_lut = sti_drm_crtc_load_lut,
 249         .disable = sti_drm_crtc_disable,
 250 };
 251
 252 static int sti_drm_crtc_page_flip(struct drm_crtc *crtc,
 253                                   struct drm_framebuffer *fb,
 254                                   struct drm_pending_vblank_event *event,
 255                                   uint32_t page_flip_flags)
 256 {
 257         struct drm_device *drm_dev = crtc->dev;
 258         struct drm_framebuffer *old_fb;
 259         struct sti_mixer *mixer = to_sti_mixer(crtc);
 260         unsigned long flags;
 261         int ret;
 262
 263         DRM_DEBUG_KMS("fb %d --> fb %d\n",
 264                         crtc->primary->fb->base.id, fb->base.id);
 265
 266         mutex_lock(&drm_dev->struct_mutex);
 267
 268         old_fb = crtc->primary->fb;
 269         crtc->primary->fb = fb;
 270         ret = sti_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
 271         if (ret) {
 272                 DRM_ERROR("failed\n");
 273                 crtc->primary->fb = old_fb;
 274                 goto out;
 275         }
 276
 277         if (event) {
 278                 event->pipe = mixer->id;
 279
 280                 ret = drm_vblank_get(drm_dev, event->pipe);
 281                 if (ret) {
 282                         DRM_ERROR("Cannot get vblank\n");
 283                         goto out;
 284                 }
 285
 286                 spin_lock_irqsave(&drm_dev->event_lock, flags);
 287                 if (mixer->pending_event) {
 288                         drm_vblank_put(drm_dev, event->pipe);
 289                         ret = -EBUSY;
 290                 } else {
 291                         mixer->pending_event = event;
 292                 }
 293                 spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 294         }
 295 out:
 296         mutex_unlock(&drm_dev->struct_mutex);
 297         return ret;
 298 }
 299
 300 static void sti_drm_crtc_destroy(struct drm_crtc *crtc)
 301 {
 302         DRM_DEBUG_KMS("\n");
 303         drm_crtc_cleanup(crtc);
 304 }
 305
 306 static int sti_drm_crtc_set_property(struct drm_crtc *crtc,
 307                                      struct drm_property *property,
 308                                      uint64_t val)
 309 {
 310         DRM_DEBUG_KMS("\n");
 311         return 0;
 312 }
 313
 314 int sti_drm_crtc_vblank_cb(struct notifier_block *nb,
 315                            unsigned long event, void *data)
 316 {
 317         struct drm_device *drm_dev;
 318         struct sti_compositor *compo =
 319                 container_of(nb, struct sti_compositor, vtg_vblank_nb);
 320         int *crtc = data;
 321         unsigned long flags;
 322         struct sti_drm_private *priv;
 323
 324         drm_dev = compo->mixer[*crtc]->drm_crtc.dev;
 325         priv = drm_dev->dev_private;
 326
 327         if ((event != VTG_TOP_FIELD_EVENT) &&
 328             (event != VTG_BOTTOM_FIELD_EVENT)) {
 329                 DRM_ERROR("unknown event: %lu\n", event);
 330                 return -EINVAL;
 331         }
 332
 333         drm_handle_vblank(drm_dev, *crtc);
 334
 335         spin_lock_irqsave(&drm_dev->event_lock, flags);
 336         if (compo->mixer[*crtc]->pending_event) {
 337                 drm_send_vblank_event(drm_dev, -1,
 338                                 compo->mixer[*crtc]->pending_event);
 339                 drm_vblank_put(drm_dev, *crtc);
 340                 compo->mixer[*crtc]->pending_event = NULL;
 341         }
 342         spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 343
 344         return 0;
 345 }
 346
 347 int sti_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 348 {
 349         struct sti_drm_private *dev_priv = dev->dev_private;
 350         struct sti_compositor *compo = dev_priv->compo;
 351         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 352
 353         if (sti_vtg_register_client(crtc == STI_MIXER_MAIN ?
 354                         compo->vtg_main : compo->vtg_aux,
 355                         vtg_vblank_nb, crtc)) {
 356                 DRM_ERROR("Cannot register VTG notifier\n");
 357                 return -EINVAL;
 358         }
 359
 360         return 0;
 361 }
 362 EXPORT_SYMBOL(sti_drm_crtc_enable_vblank);
 363
 364 void sti_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 365 {
 366         struct sti_drm_private *priv = dev->dev_private;
 367         struct sti_compositor *compo = priv->compo;
 368         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 369         unsigned long flags;
 370
 371         DRM_DEBUG_DRIVER("\n");
 372
 373         if (sti_vtg_unregister_client(crtc == STI_MIXER_MAIN ?
 374                         compo->vtg_main : compo->vtg_aux, vtg_vblank_nb))
 375                 DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
 376
 377         /* free the resources of the pending requests */
 378         spin_lock_irqsave(&dev->event_lock, flags);
 379         if (compo->mixer[crtc]->pending_event) {
 380                 drm_vblank_put(dev, crtc);
 381                 compo->mixer[crtc]->pending_event = NULL;
 382         }
 383         spin_unlock_irqrestore(&dev->event_lock, flags);
 384
 385 }
 386 EXPORT_SYMBOL(sti_drm_crtc_disable_vblank);
 387
 388 static struct drm_crtc_funcs sti_crtc_funcs = {
 389         .set_config = drm_crtc_helper_set_config,
 390         .page_flip = sti_drm_crtc_page_flip,
 391         .destroy = sti_drm_crtc_destroy,
 392         .set_property = sti_drm_crtc_set_property,
 393 };
 394
 395 bool sti_drm_crtc_is_main(struct drm_crtc *crtc)
 396 {
 397         struct sti_mixer *mixer = to_sti_mixer(crtc);
 398
 399         if (mixer->id == STI_MIXER_MAIN)
 400                 return true;
 401
 402         return false;
 403 }
 404
 405 int sti_drm_crtc_init(struct drm_device *drm_dev, struct sti_mixer *mixer,
 406                 struct drm_plane *primary, struct drm_plane *cursor)
 407 {
 408         struct drm_crtc *crtc = &mixer->drm_crtc;
 409         int res;
 410
 411         res = drm_crtc_init_with_planes(drm_dev, crtc, primary, cursor,
 412                         &sti_crtc_funcs);
 413         if (res) {
 414                 DRM_ERROR("Can not initialze CRTC\n");
 415                 return -EINVAL;
 416         }
 417
 418         drm_crtc_helper_add(crtc, &sti_crtc_helper_funcs);
 419
 420         DRM_DEBUG_DRIVER("drm CRTC:%d mapped to %s\n",
 421                          crtc->base.id, sti_mixer_to_str(mixer));
 422
 423         return 0;
 424 }