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         mixer->enabled = 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         drm_crtc_vblank_on(crtc);
  69 }
  70
  71 static bool sti_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  72                                     const struct drm_display_mode *mode,
  73                                     struct drm_display_mode *adjusted_mode)
  74 {
  75         /* accept the provided drm_display_mode, do not fix it up */
  76         return true;
  77 }
  78
  79 static int
  80 sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
  81                       struct drm_display_mode *adjusted_mode, int x, int y,
  82                       struct drm_framebuffer *old_fb)
  83 {
  84         struct sti_mixer *mixer = to_sti_mixer(crtc);
  85         struct device *dev = mixer->dev;
  86         struct sti_compositor *compo = dev_get_drvdata(dev);
  87         struct sti_layer *layer;
  88         struct clk *clk;
  89         int rate = mode->clock * 1000;
  90         int res;
  91         unsigned int w, h;
  92
  93         DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d mode:%d (%s)\n",
  94                       crtc->base.id, sti_mixer_to_str(mixer),
  95                       crtc->primary->fb->base.id, mode->base.id, mode->name);
  96
  97         DRM_DEBUG_KMS("%d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
  98                       mode->vrefresh, mode->clock,
  99                       mode->hdisplay,
 100                       mode->hsync_start, mode->hsync_end,
 101                       mode->htotal,
 102                       mode->vdisplay,
 103                       mode->vsync_start, mode->vsync_end,
 104                       mode->vtotal, mode->type, mode->flags);
 105
 106         /* Set rate and prepare/enable pixel clock */
 107         if (mixer->id == STI_MIXER_MAIN)
 108                 clk = compo->clk_pix_main;
 109         else
 110                 clk = compo->clk_pix_aux;
 111
 112         res = clk_set_rate(clk, rate);
 113         if (res < 0) {
 114                 DRM_ERROR("Cannot set rate (%dHz) for pix clk\n", rate);
 115                 return -EINVAL;
 116         }
 117         if (clk_prepare_enable(clk)) {
 118                 DRM_ERROR("Failed to prepare/enable pix clk\n");
 119                 return -EINVAL;
 120         }
 121
 122         sti_vtg_set_config(mixer->id == STI_MIXER_MAIN ?
 123                         compo->vtg_main : compo->vtg_aux, &crtc->mode);
 124
 125         /* a GDP is reserved to the CRTC FB */
 126         layer = to_sti_layer(crtc->primary);
 127         if (!layer) {
 128                 DRM_ERROR("Can not find GDP0)\n");
 129                 return -EINVAL;
 130         }
 131
 132         /* copy the mode data adjusted by mode_fixup() into crtc->mode
 133          * so that hardware can be set to proper mode
 134          */
 135         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 136
 137         res = sti_mixer_set_layer_depth(mixer, layer);
 138         if (res) {
 139                 DRM_ERROR("Can not set layer depth\n");
 140                 return -EINVAL;
 141         }
 142         res = sti_mixer_active_video_area(mixer, &crtc->mode);
 143         if (res) {
 144                 DRM_ERROR("Can not set active video area\n");
 145                 return -EINVAL;
 146         }
 147
 148         w = crtc->primary->fb->width - x;
 149         h = crtc->primary->fb->height - y;
 150
 151         return sti_layer_prepare(layer, crtc,
 152                         crtc->primary->fb, &crtc->mode,
 153                         mixer->id, 0, 0, w, h, x, y, w, h);
 154 }
 155
 156 static int sti_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 157                                       struct drm_framebuffer *old_fb)
 158 {
 159         struct sti_mixer *mixer = to_sti_mixer(crtc);
 160         struct sti_layer *layer;
 161         unsigned int w, h;
 162         int ret;
 163
 164         DRM_DEBUG_KMS("CRTC:%d (%s) fb:%d (%d,%d)\n",
 165                       crtc->base.id, sti_mixer_to_str(mixer),
 166                       crtc->primary->fb->base.id, x, y);
 167
 168         /* GDP is reserved to the CRTC FB */
 169         layer = to_sti_layer(crtc->primary);
 170         if (!layer) {
 171                 DRM_ERROR("Can not find GDP0)\n");
 172                 ret = -EINVAL;
 173                 goto out;
 174         }
 175
 176         w = crtc->primary->fb->width - crtc->x;
 177         h = crtc->primary->fb->height - crtc->y;
 178
 179         ret = sti_layer_prepare(layer, crtc,
 180                                 crtc->primary->fb, &crtc->mode,
 181                                 mixer->id, 0, 0, w, h,
 182                                 crtc->x, crtc->y, w, h);
 183         if (ret) {
 184                 DRM_ERROR("Can not prepare layer\n");
 185                 goto out;
 186         }
 187
 188         sti_drm_crtc_commit(crtc);
 189 out:
 190         return ret;
 191 }
 192
 193 static void sti_drm_crtc_load_lut(struct drm_crtc *crtc)
 194 {
 195         /* do nothing */
 196 }
 197
 198 static void sti_drm_crtc_disable(struct drm_crtc *crtc)
 199 {
 200         struct sti_mixer *mixer = to_sti_mixer(crtc);
 201         struct device *dev = mixer->dev;
 202         struct sti_compositor *compo = dev_get_drvdata(dev);
 203         struct sti_layer *layer;
 204
 205         if (!mixer->enabled)
 206                 return;
 207
 208         DRM_DEBUG_KMS("CRTC:%d (%s)\n", crtc->base.id, sti_mixer_to_str(mixer));
 209
 210         /* Disable Background */
 211         sti_mixer_set_background_status(mixer, false);
 212
 213         /* Disable GDP */
 214         layer = to_sti_layer(crtc->primary);
 215         if (!layer) {
 216                 DRM_ERROR("Cannot find GDP0\n");
 217                 return;
 218         }
 219
 220         /* Disable layer at mixer level */
 221         if (sti_mixer_set_layer_status(mixer, layer, false))
 222                 DRM_ERROR("Can not disable %s layer at mixer\n",
 223                                 sti_layer_to_str(layer));
 224
 225         /* Wait a while to be sure that a Vsync event is received */
 226         msleep(WAIT_NEXT_VSYNC_MS);
 227
 228         /* Then disable layer itself */
 229         sti_layer_disable(layer);
 230
 231         drm_crtc_vblank_off(crtc);
 232
 233         /* Disable pixel clock and compo IP clocks */
 234         if (mixer->id == STI_MIXER_MAIN) {
 235                 clk_disable_unprepare(compo->clk_pix_main);
 236                 clk_disable_unprepare(compo->clk_compo_main);
 237         } else {
 238                 clk_disable_unprepare(compo->clk_pix_aux);
 239                 clk_disable_unprepare(compo->clk_compo_aux);
 240         }
 241
 242         mixer->enabled = false;
 243 }
 244
 245 static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
 246         .dpms = sti_drm_crtc_dpms,
 247         .prepare = sti_drm_crtc_prepare,
 248         .commit = sti_drm_crtc_commit,
 249         .mode_fixup = sti_drm_crtc_mode_fixup,
 250         .mode_set = sti_drm_crtc_mode_set,
 251         .mode_set_base = sti_drm_crtc_mode_set_base,
 252         .load_lut = sti_drm_crtc_load_lut,
 253         .disable = sti_drm_crtc_disable,
 254 };
 255
 256 static int sti_drm_crtc_page_flip(struct drm_crtc *crtc,
 257                                   struct drm_framebuffer *fb,
 258                                   struct drm_pending_vblank_event *event,
 259                                   uint32_t page_flip_flags)
 260 {
 261         struct drm_device *drm_dev = crtc->dev;
 262         struct drm_framebuffer *old_fb;
 263         struct sti_mixer *mixer = to_sti_mixer(crtc);
 264         unsigned long flags;
 265         int ret;
 266
 267         DRM_DEBUG_KMS("fb %d --> fb %d\n",
 268                         crtc->primary->fb->base.id, fb->base.id);
 269
 270         mutex_lock(&drm_dev->struct_mutex);
 271
 272         old_fb = crtc->primary->fb;
 273         crtc->primary->fb = fb;
 274         ret = sti_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
 275         if (ret) {
 276                 DRM_ERROR("failed\n");
 277                 crtc->primary->fb = old_fb;
 278                 goto out;
 279         }
 280
 281         if (event) {
 282                 event->pipe = mixer->id;
 283
 284                 ret = drm_vblank_get(drm_dev, event->pipe);
 285                 if (ret) {
 286                         DRM_ERROR("Cannot get vblank\n");
 287                         goto out;
 288                 }
 289
 290                 spin_lock_irqsave(&drm_dev->event_lock, flags);
 291                 if (mixer->pending_event) {
 292                         drm_vblank_put(drm_dev, event->pipe);
 293                         ret = -EBUSY;
 294                 } else {
 295                         mixer->pending_event = event;
 296                 }
 297                 spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 298         }
 299 out:
 300         mutex_unlock(&drm_dev->struct_mutex);
 301         return ret;
 302 }
 303
 304 static void sti_drm_crtc_destroy(struct drm_crtc *crtc)
 305 {
 306         DRM_DEBUG_KMS("\n");
 307         drm_crtc_cleanup(crtc);
 308 }
 309
 310 static int sti_drm_crtc_set_property(struct drm_crtc *crtc,
 311                                      struct drm_property *property,
 312                                      uint64_t val)
 313 {
 314         DRM_DEBUG_KMS("\n");
 315         return 0;
 316 }
 317
 318 int sti_drm_crtc_vblank_cb(struct notifier_block *nb,
 319                            unsigned long event, void *data)
 320 {
 321         struct drm_device *drm_dev;
 322         struct sti_compositor *compo =
 323                 container_of(nb, struct sti_compositor, vtg_vblank_nb);
 324         int *crtc = data;
 325         unsigned long flags;
 326         struct sti_drm_private *priv;
 327
 328         drm_dev = compo->mixer[*crtc]->drm_crtc.dev;
 329         priv = drm_dev->dev_private;
 330
 331         if ((event != VTG_TOP_FIELD_EVENT) &&
 332             (event != VTG_BOTTOM_FIELD_EVENT)) {
 333                 DRM_ERROR("unknown event: %lu\n", event);
 334                 return -EINVAL;
 335         }
 336
 337         drm_handle_vblank(drm_dev, *crtc);
 338
 339         spin_lock_irqsave(&drm_dev->event_lock, flags);
 340         if (compo->mixer[*crtc]->pending_event) {
 341                 drm_send_vblank_event(drm_dev, -1,
 342                                 compo->mixer[*crtc]->pending_event);
 343                 drm_vblank_put(drm_dev, *crtc);
 344                 compo->mixer[*crtc]->pending_event = NULL;
 345         }
 346         spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 347
 348         return 0;
 349 }
 350
 351 int sti_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 352 {
 353         struct sti_drm_private *dev_priv = dev->dev_private;
 354         struct sti_compositor *compo = dev_priv->compo;
 355         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 356
 357         if (sti_vtg_register_client(crtc == STI_MIXER_MAIN ?
 358                         compo->vtg_main : compo->vtg_aux,
 359                         vtg_vblank_nb, crtc)) {
 360                 DRM_ERROR("Cannot register VTG notifier\n");
 361                 return -EINVAL;
 362         }
 363
 364         return 0;
 365 }
 366 EXPORT_SYMBOL(sti_drm_crtc_enable_vblank);
 367
 368 void sti_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 369 {
 370         struct sti_drm_private *priv = dev->dev_private;
 371         struct sti_compositor *compo = priv->compo;
 372         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 373
 374         DRM_DEBUG_DRIVER("\n");
 375
 376         if (sti_vtg_unregister_client(crtc == STI_MIXER_MAIN ?
 377                         compo->vtg_main : compo->vtg_aux, vtg_vblank_nb))
 378                 DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
 379
 380         /* free the resources of the pending requests */
 381         if (compo->mixer[crtc]->pending_event) {
 382                 drm_vblank_put(dev, crtc);
 383                 compo->mixer[crtc]->pending_event = NULL;
 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 EXPORT_SYMBOL(sti_drm_crtc_is_main);
 405
 406 int sti_drm_crtc_init(struct drm_device *drm_dev, struct sti_mixer *mixer,
 407                 struct drm_plane *primary, struct drm_plane *cursor)
 408 {
 409         struct drm_crtc *crtc = &mixer->drm_crtc;
 410         int res;
 411
 412         res = drm_crtc_init_with_planes(drm_dev, crtc, primary, cursor,
 413                         &sti_crtc_funcs);
 414         if (res) {
 415                 DRM_ERROR("Can not initialze CRTC\n");
 416                 return -EINVAL;
 417         }
 418
 419         drm_crtc_helper_add(crtc, &sti_crtc_helper_funcs);
 420
 421         DRM_DEBUG_DRIVER("drm CRTC:%d mapped to %s\n",
 422                          crtc->base.id, sti_mixer_to_str(mixer));
 423
 424         return 0;
 425 }