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->bpp = fb->bits_per_pixel;
 109         overlay->pitch = fb->pitches[0];
 110         overlay->pixel_format = fb->pixel_format;
 111
 112         /* set overlay range to be displayed. */
 113         overlay->crtc_x = pos->crtc_x;
 114         overlay->crtc_y = pos->crtc_y;
 115         overlay->crtc_width = actual_w;
 116         overlay->crtc_height = actual_h;
 117
 118         /* set drm mode data. */
 119         overlay->mode_width = mode->hdisplay;
 120         overlay->mode_height = mode->vdisplay;
 121         overlay->refresh = mode->vrefresh;
 122         overlay->scan_flag = mode->flags;
 123
 124         DRM_DEBUG_KMS("overlay : offset_x/y(%d,%d), width/height(%d,%d)",
 125                         overlay->crtc_x, overlay->crtc_y,
 126                         overlay->crtc_width, overlay->crtc_height);
 127
 128         return 0;
 129 }
 130
 131 static int exynos_drm_crtc_update(struct drm_crtc *crtc)
 132 {
 133         struct exynos_drm_crtc *exynos_crtc;
 134         struct exynos_drm_overlay *overlay;
 135         struct exynos_drm_crtc_pos pos;
 136         struct drm_display_mode *mode = &crtc->mode;
 137         struct drm_framebuffer *fb = crtc->fb;
 138
 139         if (!mode || !fb)
 140                 return -EINVAL;
 141
 142         exynos_crtc = to_exynos_crtc(crtc);
 143         overlay = &exynos_crtc->overlay;
 144
 145         memset(&pos, 0, sizeof(struct exynos_drm_crtc_pos));
 146
 147         /* it means the offset of framebuffer to be displayed. */
 148         pos.fb_x = crtc->x;
 149         pos.fb_y = crtc->y;
 150
 151         /* OSD position to be displayed. */
 152         pos.crtc_x = 0;
 153         pos.crtc_y = 0;
 154         pos.crtc_w = fb->width - crtc->x;
 155         pos.crtc_h = fb->height - crtc->y;
 156
 157         return exynos_drm_overlay_update(overlay, crtc->fb, mode, &pos);
 158 }
 159
 160 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
 161 {
 162         struct drm_device *dev = crtc->dev;
 163         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 164
 165         DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);
 166
 167         if (exynos_crtc->dpms == mode) {
 168                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
 169                 return;
 170         }
 171
 172         mutex_lock(&dev->struct_mutex);
 173
 174         switch (mode) {
 175         case DRM_MODE_DPMS_ON:
 176                 exynos_drm_fn_encoder(crtc, &mode,
 177                                 exynos_drm_encoder_crtc_dpms);
 178                 exynos_crtc->dpms = mode;
 179                 break;
 180         case DRM_MODE_DPMS_STANDBY:
 181         case DRM_MODE_DPMS_SUSPEND:
 182         case DRM_MODE_DPMS_OFF:
 183                 exynos_drm_fn_encoder(crtc, &mode,
 184                                 exynos_drm_encoder_crtc_dpms);
 185                 exynos_crtc->dpms = mode;
 186                 break;
 187         default:
 188                 DRM_ERROR("unspecified mode %d\n", mode);
 189                 break;
 190         }
 191
 192         mutex_unlock(&dev->struct_mutex);
 193 }
 194
 195 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
 196 {
 197         DRM_DEBUG_KMS("%s\n", __FILE__);
 198
 199         /* drm framework doesn't check NULL. */
 200 }
 201
 202 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
 203 {
 204         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 205
 206         DRM_DEBUG_KMS("%s\n", __FILE__);
 207
 208         /*
 209          * when set_crtc is requested from user or at booting time,
 210          * crtc->commit would be called without dpms call so if dpms is
 211          * no power on then crtc->dpms should be called
 212          * with DRM_MODE_DPMS_ON for the hardware power to be on.
 213          */
 214         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON) {
 215                 int mode = DRM_MODE_DPMS_ON;
 216
 217                 /*
 218                  * enable hardware(power on) to all encoders hdmi connected
 219                  * to current crtc.
 220                  */
 221                 exynos_drm_crtc_dpms(crtc, mode);
 222                 /*
 223                  * enable dma to all encoders connected to current crtc and
 224                  * lcd panel.
 225                  */
 226                 exynos_drm_fn_encoder(crtc, &mode,
 227                                         exynos_drm_encoder_dpms_from_crtc);
 228         }
 229
 230         exynos_drm_fn_encoder(crtc, &exynos_crtc->pipe,
 231                         exynos_drm_encoder_crtc_commit);
 232 }
 233
 234 static bool
 235 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 236                             struct drm_display_mode *mode,
 237                             struct drm_display_mode *adjusted_mode)
 238 {
 239         DRM_DEBUG_KMS("%s\n", __FILE__);
 240
 241         /* drm framework doesn't check NULL */
 242         return true;
 243 }
 244
 245 static int
 246 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 247                           struct drm_display_mode *adjusted_mode, int x, int y,
 248                           struct drm_framebuffer *old_fb)
 249 {
 250         DRM_DEBUG_KMS("%s\n", __FILE__);
 251
 252         mode = adjusted_mode;
 253
 254         return exynos_drm_crtc_update(crtc);
 255 }
 256
 257 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 258                                           struct drm_framebuffer *old_fb)
 259 {
 260         int ret;
 261
 262         DRM_DEBUG_KMS("%s\n", __FILE__);
 263
 264         ret = exynos_drm_crtc_update(crtc);
 265         if (ret)
 266                 return ret;
 267
 268         exynos_drm_crtc_apply(crtc);
 269
 270         return ret;
 271 }
 272
 273 static void exynos_drm_crtc_load_lut(struct drm_crtc *crtc)
 274 {
 275         DRM_DEBUG_KMS("%s\n", __FILE__);
 276         /* drm framework doesn't check NULL */
 277 }
 278
 279 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 280         .dpms           = exynos_drm_crtc_dpms,
 281         .prepare        = exynos_drm_crtc_prepare,
 282         .commit         = exynos_drm_crtc_commit,
 283         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 284         .mode_set       = exynos_drm_crtc_mode_set,
 285         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 286         .load_lut       = exynos_drm_crtc_load_lut,
 287 };
 288
 289 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 290                                       struct drm_framebuffer *fb,
 291                                       struct drm_pending_vblank_event *event)
 292 {
 293         struct drm_device *dev = crtc->dev;
 294         struct exynos_drm_private *dev_priv = dev->dev_private;
 295         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 296         struct drm_framebuffer *old_fb = crtc->fb;
 297         int ret = -EINVAL;
 298
 299         DRM_DEBUG_KMS("%s\n", __FILE__);
 300
 301         mutex_lock(&dev->struct_mutex);
 302
 303         if (event) {
 304                 /*
 305                  * the pipe from user always is 0 so we can set pipe number
 306                  * of current owner to event.
 307                  */
 308                 event->pipe = exynos_crtc->pipe;
 309
 310                 list_add_tail(&event->base.link,
 311                                 &dev_priv->pageflip_event_list);
 312
 313                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 314                 if (ret) {
 315                         DRM_DEBUG("failed to acquire vblank counter\n");
 316                         list_del(&event->base.link);
 317
 318                         goto out;
 319                 }
 320
 321                 crtc->fb = fb;
 322                 ret = exynos_drm_crtc_update(crtc);
 323                 if (ret) {
 324                         crtc->fb = old_fb;
 325                         drm_vblank_put(dev, exynos_crtc->pipe);
 326                         list_del(&event->base.link);
 327
 328                         goto out;
 329                 }
 330
 331                 /*
 332                  * the values related to a buffer of the drm framebuffer
 333                  * to be applied should be set at here. because these values
 334                  * first, are set to shadow registers and then to
 335                  * real registers at vsync front porch period.
 336                  */
 337                 exynos_drm_crtc_apply(crtc);
 338         }
 339 out:
 340         mutex_unlock(&dev->struct_mutex);
 341         return ret;
 342 }
 343
 344 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 345 {
 346         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 347         struct exynos_drm_private *private = crtc->dev->dev_private;
 348
 349         DRM_DEBUG_KMS("%s\n", __FILE__);
 350
 351         private->crtc[exynos_crtc->pipe] = NULL;
 352
 353         drm_crtc_cleanup(crtc);
 354         kfree(exynos_crtc);
 355 }
 356
 357 static struct drm_crtc_funcs exynos_crtc_funcs = {
 358         .set_config     = drm_crtc_helper_set_config,
 359         .page_flip      = exynos_drm_crtc_page_flip,
 360         .destroy        = exynos_drm_crtc_destroy,
 361 };
 362
 363 struct exynos_drm_overlay *get_exynos_drm_overlay(struct drm_device *dev,
 364                 struct drm_crtc *crtc)
 365 {
 366         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 367
 368         return &exynos_crtc->overlay;
 369 }
 370
 371 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 372 {
 373         struct exynos_drm_crtc *exynos_crtc;
 374         struct exynos_drm_private *private = dev->dev_private;
 375         struct drm_crtc *crtc;
 376
 377         DRM_DEBUG_KMS("%s\n", __FILE__);
 378
 379         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 380         if (!exynos_crtc) {
 381                 DRM_ERROR("failed to allocate exynos crtc\n");
 382                 return -ENOMEM;
 383         }
 384
 385         exynos_crtc->pipe = nr;
 386         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 387         exynos_crtc->overlay.zpos = DEFAULT_ZPOS;
 388         crtc = &exynos_crtc->drm_crtc;
 389
 390         private->crtc[nr] = crtc;
 391
 392         drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 393         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 394
 395         return 0;
 396 }
 397
 398 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 399 {
 400         struct exynos_drm_private *private = dev->dev_private;
 401         struct exynos_drm_crtc *exynos_crtc =
 402                 to_exynos_crtc(private->crtc[crtc]);
 403
 404         DRM_DEBUG_KMS("%s\n", __FILE__);
 405
 406         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 407                 return -EPERM;
 408
 409         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 410                         exynos_drm_enable_vblank);
 411
 412         return 0;
 413 }
 414
 415 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 416 {
 417         struct exynos_drm_private *private = dev->dev_private;
 418         struct exynos_drm_crtc *exynos_crtc =
 419                 to_exynos_crtc(private->crtc[crtc]);
 420
 421         DRM_DEBUG_KMS("%s\n", __FILE__);
 422
 423         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 424                 return;
 425
 426         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 427                         exynos_drm_disable_vblank);
 428 }
 429
 430 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 431 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 432 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 433 MODULE_DESCRIPTION("Samsung SoC DRM CRTC Driver");
 434 MODULE_LICENSE("GPL");