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_drv.h"
  33 #include "exynos_drm_fb.h"
  34 #include "exynos_drm_encoder.h"
  35 #include "exynos_drm_buf.h"
  36
  37 #define to_exynos_crtc(x)       container_of(x, struct exynos_drm_crtc,\
  38                                 drm_crtc)
  39
  40 /*
  41  * Exynos specific crtc postion structure.
  42  *
  43  * @fb_x: offset x on a framebuffer to be displyed
  44  *      - the unit is screen coordinates.
  45  * @fb_y: offset y on a framebuffer to be displayed
  46  *      - the unit is screen coordinates.
  47  * @crtc_x: offset x on hardware screen.
  48  * @crtc_y: offset y on hardware screen.
  49  * @crtc_w: width of hardware screen.
  50  * @crtc_h: height of hardware screen.
  51  */
  52 struct exynos_drm_crtc_pos {
  53         unsigned int fb_x;
  54         unsigned int fb_y;
  55         unsigned int crtc_x;
  56         unsigned int crtc_y;
  57         unsigned int crtc_w;
  58         unsigned int crtc_h;
  59 };
  60
  61 /*
  62  * Exynos specific crtc structure.
  63  *
  64  * @drm_crtc: crtc object.
  65  * @overlay: contain information common to display controller and hdmi and
  66  *      contents of this overlay object would be copied to sub driver size.
  67  * @pipe: a crtc index created at load() with a new crtc object creation
  68  *      and the crtc object would be set to private->crtc array
  69  *      to get a crtc object corresponding to this pipe from private->crtc
  70  *      array when irq interrupt occured. the reason of using this pipe is that
  71  *      drm framework doesn't support multiple irq yet.
  72  *      we can refer to the crtc to current hardware interrupt occured through
  73  *      this pipe value.
  74  */
  75 struct exynos_drm_crtc {
  76         struct drm_crtc                 drm_crtc;
  77         struct exynos_drm_overlay       overlay;
  78         unsigned int                    pipe;
  79 };
  80
  81 static void exynos_drm_crtc_apply(struct drm_crtc *crtc)
  82 {
  83         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  84         struct exynos_drm_overlay *overlay = &exynos_crtc->overlay;
  85
  86         exynos_drm_fn_encoder(crtc, overlay,
  87                         exynos_drm_encoder_crtc_mode_set);
  88         exynos_drm_fn_encoder(crtc, NULL, exynos_drm_encoder_crtc_commit);
  89 }
  90
  91 static int exynos_drm_overlay_update(struct exynos_drm_overlay *overlay,
  92                                        struct drm_framebuffer *fb,
  93                                        struct drm_display_mode *mode,
  94                                        struct exynos_drm_crtc_pos *pos)
  95 {
  96         struct exynos_drm_buf_entry *entry;
  97         unsigned int actual_w;
  98         unsigned int actual_h;
  99
 100         entry = exynos_drm_fb_get_buf(fb);
 101         if (!entry) {
 102                 DRM_LOG_KMS("entry is null.\n");
 103                 return -EFAULT;
 104         }
 105
 106         overlay->paddr = entry->paddr;
 107         overlay->vaddr = entry->vaddr;
 108
 109         DRM_DEBUG_KMS("vaddr = 0x%lx, paddr = 0x%lx\n",
 110                         (unsigned long)overlay->vaddr,
 111                         (unsigned long)overlay->paddr);
 112
 113         actual_w = min((mode->hdisplay - pos->crtc_x), pos->crtc_w);
 114         actual_h = min((mode->vdisplay - pos->crtc_y), pos->crtc_h);
 115
 116         /* set drm framebuffer data. */
 117         overlay->fb_x = pos->fb_x;
 118         overlay->fb_y = pos->fb_y;
 119         overlay->fb_width = fb->width;
 120         overlay->fb_height = fb->height;
 121         overlay->bpp = fb->bits_per_pixel;
 122         overlay->pitch = fb->pitch;
 123
 124         /* set overlay range to be displayed. */
 125         overlay->crtc_x = pos->crtc_x;
 126         overlay->crtc_y = pos->crtc_y;
 127         overlay->crtc_width = actual_w;
 128         overlay->crtc_height = actual_h;
 129
 130         /* set drm mode data. */
 131         overlay->mode_width = mode->hdisplay;
 132         overlay->mode_height = mode->vdisplay;
 133         overlay->refresh = mode->vrefresh;
 134         overlay->scan_flag = mode->flags;
 135
 136         DRM_DEBUG_KMS("overlay : offset_x/y(%d,%d), width/height(%d,%d)",
 137                         overlay->crtc_x, overlay->crtc_y,
 138                         overlay->crtc_width, overlay->crtc_height);
 139
 140         return 0;
 141 }
 142
 143 static int exynos_drm_crtc_update(struct drm_crtc *crtc)
 144 {
 145         struct exynos_drm_crtc *exynos_crtc;
 146         struct exynos_drm_overlay *overlay;
 147         struct exynos_drm_crtc_pos pos;
 148         struct drm_display_mode *mode = &crtc->mode;
 149         struct drm_framebuffer *fb = crtc->fb;
 150
 151         if (!mode || !fb)
 152                 return -EINVAL;
 153
 154         exynos_crtc = to_exynos_crtc(crtc);
 155         overlay = &exynos_crtc->overlay;
 156
 157         memset(&pos, 0, sizeof(struct exynos_drm_crtc_pos));
 158
 159         /* it means the offset of framebuffer to be displayed. */
 160         pos.fb_x = crtc->x;
 161         pos.fb_y = crtc->y;
 162
 163         /* OSD position to be displayed. */
 164         pos.crtc_x = 0;
 165         pos.crtc_y = 0;
 166         pos.crtc_w = fb->width - crtc->x;
 167         pos.crtc_h = fb->height - crtc->y;
 168
 169         return exynos_drm_overlay_update(overlay, crtc->fb, mode, &pos);
 170 }
 171
 172 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
 173 {
 174         DRM_DEBUG_KMS("%s\n", __FILE__);
 175
 176         /* TODO */
 177 }
 178
 179 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
 180 {
 181         DRM_DEBUG_KMS("%s\n", __FILE__);
 182
 183         /* drm framework doesn't check NULL. */
 184 }
 185
 186 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
 187 {
 188         DRM_DEBUG_KMS("%s\n", __FILE__);
 189
 190         /* drm framework doesn't check NULL. */
 191 }
 192
 193 static bool
 194 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 195                             struct drm_display_mode *mode,
 196                             struct drm_display_mode *adjusted_mode)
 197 {
 198         DRM_DEBUG_KMS("%s\n", __FILE__);
 199
 200         /* drm framework doesn't check NULL */
 201         return true;
 202 }
 203
 204 static int
 205 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 206                           struct drm_display_mode *adjusted_mode, int x, int y,
 207                           struct drm_framebuffer *old_fb)
 208 {
 209         DRM_DEBUG_KMS("%s\n", __FILE__);
 210
 211         mode = adjusted_mode;
 212
 213         return exynos_drm_crtc_update(crtc);
 214 }
 215
 216 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 217                                           struct drm_framebuffer *old_fb)
 218 {
 219         int ret;
 220
 221         DRM_DEBUG_KMS("%s\n", __FILE__);
 222
 223         ret = exynos_drm_crtc_update(crtc);
 224         if (ret)
 225                 return ret;
 226
 227         exynos_drm_crtc_apply(crtc);
 228
 229         return ret;
 230 }
 231
 232 static void exynos_drm_crtc_load_lut(struct drm_crtc *crtc)
 233 {
 234         DRM_DEBUG_KMS("%s\n", __FILE__);
 235         /* drm framework doesn't check NULL */
 236 }
 237
 238 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 239         .dpms           = exynos_drm_crtc_dpms,
 240         .prepare        = exynos_drm_crtc_prepare,
 241         .commit         = exynos_drm_crtc_commit,
 242         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 243         .mode_set       = exynos_drm_crtc_mode_set,
 244         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 245         .load_lut       = exynos_drm_crtc_load_lut,
 246 };
 247
 248 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 249                                       struct drm_framebuffer *fb,
 250                                       struct drm_pending_vblank_event *event)
 251 {
 252         struct drm_device *dev = crtc->dev;
 253         struct exynos_drm_private *dev_priv = dev->dev_private;
 254         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 255         struct drm_framebuffer *old_fb = crtc->fb;
 256         int ret = -EINVAL;
 257
 258         DRM_DEBUG_KMS("%s\n", __FILE__);
 259
 260         mutex_lock(&dev->struct_mutex);
 261
 262         if (event) {
 263                 /*
 264                  * the pipe from user always is 0 so we can set pipe number
 265                  * of current owner to event.
 266                  */
 267                 event->pipe = exynos_crtc->pipe;
 268
 269                 list_add_tail(&event->base.link,
 270                                 &dev_priv->pageflip_event_list);
 271
 272                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 273                 if (ret) {
 274                         DRM_DEBUG("failed to acquire vblank counter\n");
 275                         list_del(&event->base.link);
 276
 277                         goto out;
 278                 }
 279
 280                 crtc->fb = fb;
 281                 ret = exynos_drm_crtc_update(crtc);
 282                 if (ret) {
 283                         crtc->fb = old_fb;
 284                         drm_vblank_put(dev, exynos_crtc->pipe);
 285                         list_del(&event->base.link);
 286
 287                         goto out;
 288                 }
 289
 290                 /*
 291                  * the values related to a buffer of the drm framebuffer
 292                  * to be applied should be set at here. because these values
 293                  * first, are set to shadow registers and then to
 294                  * real registers at vsync front porch period.
 295                  */
 296                 exynos_drm_crtc_apply(crtc);
 297         }
 298 out:
 299         mutex_unlock(&dev->struct_mutex);
 300         return ret;
 301 }
 302
 303 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 304 {
 305         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 306         struct exynos_drm_private *private = crtc->dev->dev_private;
 307
 308         DRM_DEBUG_KMS("%s\n", __FILE__);
 309
 310         private->crtc[exynos_crtc->pipe] = NULL;
 311
 312         drm_crtc_cleanup(crtc);
 313         kfree(exynos_crtc);
 314 }
 315
 316 static struct drm_crtc_funcs exynos_crtc_funcs = {
 317         .set_config     = drm_crtc_helper_set_config,
 318         .page_flip      = exynos_drm_crtc_page_flip,
 319         .destroy        = exynos_drm_crtc_destroy,
 320 };
 321
 322 struct exynos_drm_overlay *get_exynos_drm_overlay(struct drm_device *dev,
 323                 struct drm_crtc *crtc)
 324 {
 325         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 326
 327         return &exynos_crtc->overlay;
 328 }
 329
 330 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 331 {
 332         struct exynos_drm_crtc *exynos_crtc;
 333         struct exynos_drm_private *private = dev->dev_private;
 334         struct drm_crtc *crtc;
 335
 336         DRM_DEBUG_KMS("%s\n", __FILE__);
 337
 338         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 339         if (!exynos_crtc) {
 340                 DRM_ERROR("failed to allocate exynos crtc\n");
 341                 return -ENOMEM;
 342         }
 343
 344         exynos_crtc->pipe = nr;
 345         crtc = &exynos_crtc->drm_crtc;
 346
 347         private->crtc[nr] = crtc;
 348
 349         drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 350         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 351
 352         return 0;
 353 }
 354
 355 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 356 {
 357         struct exynos_drm_private *private = dev->dev_private;
 358
 359         DRM_DEBUG_KMS("%s\n", __FILE__);
 360
 361         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 362                         exynos_drm_enable_vblank);
 363
 364         return 0;
 365 }
 366
 367 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 368 {
 369         struct exynos_drm_private *private = dev->dev_private;
 370
 371         DRM_DEBUG_KMS("%s\n", __FILE__);
 372
 373         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 374                         exynos_drm_disable_vblank);
 375 }
 376
 377 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 378 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 379 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 380 MODULE_DESCRIPTION("Samsung SoC DRM CRTC Driver");
 381 MODULE_LICENSE("GPL");