drivers/gpu/drm/exynos/exynos_drm_crtc.c

   1 /* exynos_drm_crtc.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include "drmP.h"
  30 #include "drm_crtc_helper.h"
  31
  32 #include "exynos_drm_crtc.h"
  33 #include "exynos_drm_drv.h"
  34 #include "exynos_drm_fb.h"
  35 #include "exynos_drm_encoder.h"
  36 #include "exynos_drm_gem.h"
  37
  38 #define to_exynos_crtc(x)       container_of(x, struct exynos_drm_crtc,\
  39                                 drm_crtc)
  40
  41 /*
  42  * Exynos specific crtc structure.
  43  *
  44  * @drm_crtc: crtc object.
  45  * @overlay: contain information common to display controller and hdmi and
  46  *      contents of this overlay object would be copied to sub driver size.
  47  * @pipe: a crtc index created at load() with a new crtc object creation
  48  *      and the crtc object would be set to private->crtc array
  49  *      to get a crtc object corresponding to this pipe from private->crtc
  50  *      array when irq interrupt occured. the reason of using this pipe is that
  51  *      drm framework doesn't support multiple irq yet.
  52  *      we can refer to the crtc to current hardware interrupt occured through
  53  *      this pipe value.
  54  * @dpms: store the crtc dpms value
  55  */
  56 struct exynos_drm_crtc {
  57         struct drm_crtc                 drm_crtc;
  58         struct exynos_drm_overlay       overlay;
  59         unsigned int                    pipe;
  60         unsigned int                    dpms;
  61 };
  62
  63 static void exynos_drm_crtc_apply(struct drm_crtc *crtc)
  64 {
  65         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  66         struct exynos_drm_overlay *overlay = &exynos_crtc->overlay;
  67
  68         exynos_drm_fn_encoder(crtc, overlay,
  69                         exynos_drm_encoder_crtc_mode_set);
  70         exynos_drm_fn_encoder(crtc, &exynos_crtc->pipe,
  71                         exynos_drm_encoder_crtc_commit);
  72 }
  73
  74 int exynos_drm_overlay_update(struct exynos_drm_overlay *overlay,
  75                               struct drm_framebuffer *fb,
  76                               struct drm_display_mode *mode,
  77                               struct exynos_drm_crtc_pos *pos)
  78 {
  79         struct exynos_drm_gem_buf *buffer;
  80         unsigned int actual_w;
  81         unsigned int actual_h;
  82         int nr = exynos_drm_format_num_buffers(fb->pixel_format);
  83         int i;
  84
  85         for (i = 0; i < nr; i++) {
  86                 buffer = exynos_drm_fb_buffer(fb, i);
  87                 if (!buffer) {
  88                         DRM_LOG_KMS("buffer is null\n");
  89                         return -EFAULT;
  90                 }
  91
  92                 overlay->dma_addr[i] = buffer->dma_addr;
  93                 overlay->vaddr[i] = buffer->kvaddr;
  94
  95                 DRM_DEBUG_KMS("buffer: %d, vaddr = 0x%lx, dma_addr = 0x%lx\n",
  96                                 i, (unsigned long)overlay->vaddr[i],
  97                                 (unsigned long)overlay->dma_addr[i]);
  98         }
  99
 100         actual_w = min((mode->hdisplay - pos->crtc_x), pos->crtc_w);
 101         actual_h = min((mode->vdisplay - pos->crtc_y), pos->crtc_h);
 102
 103         /* set drm framebuffer data. */
 104         overlay->fb_x = pos->fb_x;
 105         overlay->fb_y = pos->fb_y;
 106         overlay->fb_width = fb->width;
 107         overlay->fb_height = fb->height;
 108         overlay->src_width = pos->src_w;
 109         overlay->src_height = pos->src_h;
 110         overlay->bpp = fb->bits_per_pixel;
 111         overlay->pitch = fb->pitches[0];
 112         overlay->pixel_format = fb->pixel_format;
 113
 114         /* set overlay range to be displayed. */
 115         overlay->crtc_x = pos->crtc_x;
 116         overlay->crtc_y = pos->crtc_y;
 117         overlay->crtc_width = actual_w;
 118         overlay->crtc_height = actual_h;
 119
 120         /* set drm mode data. */
 121         overlay->mode_width = mode->hdisplay;
 122         overlay->mode_height = mode->vdisplay;
 123         overlay->refresh = mode->vrefresh;
 124         overlay->scan_flag = mode->flags;
 125
 126         DRM_DEBUG_KMS("overlay : offset_x/y(%d,%d), width/height(%d,%d)",
 127                         overlay->crtc_x, overlay->crtc_y,
 128                         overlay->crtc_width, overlay->crtc_height);
 129
 130         return 0;
 131 }
 132
 133 static int exynos_drm_crtc_update(struct drm_crtc *crtc)
 134 {
 135         struct exynos_drm_crtc *exynos_crtc;
 136         struct exynos_drm_overlay *overlay;
 137         struct exynos_drm_crtc_pos pos;
 138         struct drm_display_mode *mode = &crtc->mode;
 139         struct drm_framebuffer *fb = crtc->fb;
 140
 141         if (!mode || !fb)
 142                 return -EINVAL;
 143
 144         exynos_crtc = to_exynos_crtc(crtc);
 145         overlay = &exynos_crtc->overlay;
 146
 147         memset(&pos, 0, sizeof(struct exynos_drm_crtc_pos));
 148
 149         /* it means the offset of framebuffer to be displayed. */
 150         pos.fb_x = crtc->x;
 151         pos.fb_y = crtc->y;
 152
 153         /* OSD position to be displayed. */
 154         pos.crtc_x = 0;
 155         pos.crtc_y = 0;
 156         pos.crtc_w = fb->width - crtc->x;
 157         pos.crtc_h = fb->height - crtc->y;
 158         pos.src_w = pos.crtc_w;
 159         pos.src_h = pos.crtc_h;
 160
 161         return exynos_drm_overlay_update(overlay, crtc->fb, mode, &pos);
 162 }
 163
 164 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
 165 {
 166         struct drm_device *dev = crtc->dev;
 167         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 168
 169         DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);
 170
 171         if (exynos_crtc->dpms == mode) {
 172                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
 173                 return;
 174         }
 175
 176         mutex_lock(&dev->struct_mutex);
 177
 178         switch (mode) {
 179         case DRM_MODE_DPMS_ON:
 180                 exynos_drm_fn_encoder(crtc, &mode,
 181                                 exynos_drm_encoder_crtc_dpms);
 182                 exynos_crtc->dpms = mode;
 183                 break;
 184         case DRM_MODE_DPMS_STANDBY:
 185         case DRM_MODE_DPMS_SUSPEND:
 186         case DRM_MODE_DPMS_OFF:
 187                 exynos_drm_fn_encoder(crtc, &mode,
 188                                 exynos_drm_encoder_crtc_dpms);
 189                 exynos_crtc->dpms = mode;
 190                 break;
 191         default:
 192                 DRM_ERROR("unspecified mode %d\n", mode);
 193                 break;
 194         }
 195
 196         mutex_unlock(&dev->struct_mutex);
 197 }
 198
 199 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
 200 {
 201         DRM_DEBUG_KMS("%s\n", __FILE__);
 202
 203         /* drm framework doesn't check NULL. */
 204 }
 205
 206 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
 207 {
 208         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 209
 210         DRM_DEBUG_KMS("%s\n", __FILE__);
 211
 212         /*
 213          * when set_crtc is requested from user or at booting time,
 214          * crtc->commit would be called without dpms call so if dpms is
 215          * no power on then crtc->dpms should be called
 216          * with DRM_MODE_DPMS_ON for the hardware power to be on.
 217          */
 218         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON) {
 219                 int mode = DRM_MODE_DPMS_ON;
 220
 221                 /*
 222                  * enable hardware(power on) to all encoders hdmi connected
 223                  * to current crtc.
 224                  */
 225                 exynos_drm_crtc_dpms(crtc, mode);
 226                 /*
 227                  * enable dma to all encoders connected to current crtc and
 228                  * lcd panel.
 229                  */
 230                 exynos_drm_fn_encoder(crtc, &mode,
 231                                         exynos_drm_encoder_dpms_from_crtc);
 232         }
 233
 234         exynos_drm_fn_encoder(crtc, &exynos_crtc->pipe,
 235                         exynos_drm_encoder_crtc_commit);
 236 }
 237
 238 static bool
 239 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 240                             const struct drm_display_mode *mode,
 241                             struct drm_display_mode *adjusted_mode)
 242 {
 243         DRM_DEBUG_KMS("%s\n", __FILE__);
 244
 245         /* drm framework doesn't check NULL */
 246         return true;
 247 }
 248
 249 static int
 250 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 251                           struct drm_display_mode *adjusted_mode, int x, int y,
 252                           struct drm_framebuffer *old_fb)
 253 {
 254         DRM_DEBUG_KMS("%s\n", __FILE__);
 255
 256         /*
 257          * copy the mode data adjusted by mode_fixup() into crtc->mode
 258          * so that hardware can be seet to proper mode.
 259          */
 260         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 261
 262         return exynos_drm_crtc_update(crtc);
 263 }
 264
 265 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 266                                           struct drm_framebuffer *old_fb)
 267 {
 268         int ret;
 269
 270         DRM_DEBUG_KMS("%s\n", __FILE__);
 271
 272         ret = exynos_drm_crtc_update(crtc);
 273         if (ret)
 274                 return ret;
 275
 276         exynos_drm_crtc_apply(crtc);
 277
 278         return ret;
 279 }
 280
 281 static void exynos_drm_crtc_load_lut(struct drm_crtc *crtc)
 282 {
 283         DRM_DEBUG_KMS("%s\n", __FILE__);
 284         /* drm framework doesn't check NULL */
 285 }
 286
 287 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 288         .dpms           = exynos_drm_crtc_dpms,
 289         .prepare        = exynos_drm_crtc_prepare,
 290         .commit         = exynos_drm_crtc_commit,
 291         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 292         .mode_set       = exynos_drm_crtc_mode_set,
 293         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 294         .load_lut       = exynos_drm_crtc_load_lut,
 295 };
 296
 297 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 298                                       struct drm_framebuffer *fb,
 299                                       struct drm_pending_vblank_event *event)
 300 {
 301         struct drm_device *dev = crtc->dev;
 302         struct exynos_drm_private *dev_priv = dev->dev_private;
 303         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 304         struct drm_framebuffer *old_fb = crtc->fb;
 305         int ret = -EINVAL;
 306
 307         DRM_DEBUG_KMS("%s\n", __FILE__);
 308
 309         mutex_lock(&dev->struct_mutex);
 310
 311         if (event) {
 312                 /*
 313                  * the pipe from user always is 0 so we can set pipe number
 314                  * of current owner to event.
 315                  */
 316                 event->pipe = exynos_crtc->pipe;
 317
 318                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 319                 if (ret) {
 320                         DRM_DEBUG("failed to acquire vblank counter\n");
 321                         list_del(&event->base.link);
 322
 323                         goto out;
 324                 }
 325
 326                 list_add_tail(&event->base.link,
 327                                 &dev_priv->pageflip_event_list);
 328
 329                 crtc->fb = fb;
 330                 ret = exynos_drm_crtc_update(crtc);
 331                 if (ret) {
 332                         crtc->fb = old_fb;
 333                         drm_vblank_put(dev, exynos_crtc->pipe);
 334                         list_del(&event->base.link);
 335
 336                         goto out;
 337                 }
 338
 339                 /*
 340                  * the values related to a buffer of the drm framebuffer
 341                  * to be applied should be set at here. because these values
 342                  * first, are set to shadow registers and then to
 343                  * real registers at vsync front porch period.
 344                  */
 345                 exynos_drm_crtc_apply(crtc);
 346         }
 347 out:
 348         mutex_unlock(&dev->struct_mutex);
 349         return ret;
 350 }
 351
 352 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 353 {
 354         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 355         struct exynos_drm_private *private = crtc->dev->dev_private;
 356
 357         DRM_DEBUG_KMS("%s\n", __FILE__);
 358
 359         private->crtc[exynos_crtc->pipe] = NULL;
 360
 361         drm_crtc_cleanup(crtc);
 362         kfree(exynos_crtc);
 363 }
 364
 365 static struct drm_crtc_funcs exynos_crtc_funcs = {
 366         .set_config     = drm_crtc_helper_set_config,
 367         .page_flip      = exynos_drm_crtc_page_flip,
 368         .destroy        = exynos_drm_crtc_destroy,
 369 };
 370
 371 struct exynos_drm_overlay *get_exynos_drm_overlay(struct drm_device *dev,
 372                 struct drm_crtc *crtc)
 373 {
 374         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 375
 376         return &exynos_crtc->overlay;
 377 }
 378
 379 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 380 {
 381         struct exynos_drm_crtc *exynos_crtc;
 382         struct exynos_drm_private *private = dev->dev_private;
 383         struct drm_crtc *crtc;
 384
 385         DRM_DEBUG_KMS("%s\n", __FILE__);
 386
 387         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 388         if (!exynos_crtc) {
 389                 DRM_ERROR("failed to allocate exynos crtc\n");
 390                 return -ENOMEM;
 391         }
 392
 393         exynos_crtc->pipe = nr;
 394         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 395         exynos_crtc->overlay.zpos = DEFAULT_ZPOS;
 396         crtc = &exynos_crtc->drm_crtc;
 397
 398         private->crtc[nr] = crtc;
 399
 400         drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 401         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 402
 403         return 0;
 404 }
 405
 406 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 407 {
 408         struct exynos_drm_private *private = dev->dev_private;
 409         struct exynos_drm_crtc *exynos_crtc =
 410                 to_exynos_crtc(private->crtc[crtc]);
 411
 412         DRM_DEBUG_KMS("%s\n", __FILE__);
 413
 414         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 415                 return -EPERM;
 416
 417         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 418                         exynos_drm_enable_vblank);
 419
 420         return 0;
 421 }
 422
 423 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 424 {
 425         struct exynos_drm_private *private = dev->dev_private;
 426         struct exynos_drm_crtc *exynos_crtc =
 427                 to_exynos_crtc(private->crtc[crtc]);
 428
 429         DRM_DEBUG_KMS("%s\n", __FILE__);
 430
 431         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 432                 return;
 433
 434         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 435                         exynos_drm_disable_vblank);
 436 }