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