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  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc_helper.h>
  17
  18 #include "exynos_drm_crtc.h"
  19 #include "exynos_drm_drv.h"
  20 #include "exynos_drm_encoder.h"
  21 #include "exynos_drm_plane.h"
  22
  23 #define to_exynos_crtc(x)       container_of(x, struct exynos_drm_crtc,\
  24                                 drm_crtc)
  25
  26 enum exynos_crtc_mode {
  27         CRTC_MODE_NORMAL,       /* normal mode */
  28         CRTC_MODE_BLANK,        /* The private plane of crtc is blank */
  29 };
  30
  31 /*
  32  * Exynos specific crtc structure.
  33  *
  34  * @drm_crtc: crtc object.
  35  * @drm_plane: pointer of private plane object for this crtc
  36  * @pipe: a crtc index created at load() with a new crtc object creation
  37  *      and the crtc object would be set to private->crtc array
  38  *      to get a crtc object corresponding to this pipe from private->crtc
  39  *      array when irq interrupt occurred. the reason of using this pipe is that
  40  *      drm framework doesn't support multiple irq yet.
  41  *      we can refer to the crtc to current hardware interrupt occurred through
  42  *      this pipe value.
  43  * @dpms: store the crtc dpms value
  44  * @mode: store the crtc mode value
  45  */
  46 struct exynos_drm_crtc {
  47         struct drm_crtc                 drm_crtc;
  48         struct drm_plane                *plane;
  49         unsigned int                    pipe;
  50         unsigned int                    dpms;
  51         enum exynos_crtc_mode           mode;
  52         wait_queue_head_t               pending_flip_queue;
  53         atomic_t                        pending_flip;
  54 };
  55
  56 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
  57 {
  58         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  59
  60         DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);
  61
  62         if (exynos_crtc->dpms == mode) {
  63                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
  64                 return;
  65         }
  66
  67         if (mode > DRM_MODE_DPMS_ON) {
  68                 /* wait for the completion of page flip. */
  69                 wait_event(exynos_crtc->pending_flip_queue,
  70                                 atomic_read(&exynos_crtc->pending_flip) == 0);
  71                 drm_vblank_off(crtc->dev, exynos_crtc->pipe);
  72         }
  73
  74         exynos_drm_fn_encoder(crtc, &mode, exynos_drm_encoder_crtc_dpms);
  75         exynos_crtc->dpms = mode;
  76 }
  77
  78 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
  79 {
  80         /* drm framework doesn't check NULL. */
  81 }
  82
  83 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
  84 {
  85         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  86
  87         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
  88         exynos_plane_commit(exynos_crtc->plane);
  89         exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_ON);
  90 }
  91
  92 static bool
  93 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  94                             const struct drm_display_mode *mode,
  95                             struct drm_display_mode *adjusted_mode)
  96 {
  97         /* drm framework doesn't check NULL */
  98         return true;
  99 }
 100
 101 static int
 102 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 103                           struct drm_display_mode *adjusted_mode, int x, int y,
 104                           struct drm_framebuffer *old_fb)
 105 {
 106         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 107         struct drm_plane *plane = exynos_crtc->plane;
 108         unsigned int crtc_w;
 109         unsigned int crtc_h;
 110         int pipe = exynos_crtc->pipe;
 111         int ret;
 112
 113         /*
 114          * copy the mode data adjusted by mode_fixup() into crtc->mode
 115          * so that hardware can be seet to proper mode.
 116          */
 117         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 118
 119         crtc_w = crtc->fb->width - x;
 120         crtc_h = crtc->fb->height - y;
 121
 122         ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
 123                                     x, y, crtc_w, crtc_h);
 124         if (ret)
 125                 return ret;
 126
 127         plane->crtc = crtc;
 128         plane->fb = crtc->fb;
 129
 130         exynos_drm_fn_encoder(crtc, &pipe, exynos_drm_encoder_crtc_pipe);
 131
 132         return 0;
 133 }
 134
 135 static int exynos_drm_crtc_mode_set_commit(struct drm_crtc *crtc, int x, int y,
 136                                           struct drm_framebuffer *old_fb)
 137 {
 138         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 139         struct drm_plane *plane = exynos_crtc->plane;
 140         unsigned int crtc_w;
 141         unsigned int crtc_h;
 142         int ret;
 143
 144         /* when framebuffer changing is requested, crtc's dpms should be on */
 145         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 146                 DRM_ERROR("failed framebuffer changing request.\n");
 147                 return -EPERM;
 148         }
 149
 150         crtc_w = crtc->fb->width - x;
 151         crtc_h = crtc->fb->height - y;
 152
 153         ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
 154                                     x, y, crtc_w, crtc_h);
 155         if (ret)
 156                 return ret;
 157
 158         exynos_drm_crtc_commit(crtc);
 159
 160         return 0;
 161 }
 162
 163 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 164                                           struct drm_framebuffer *old_fb)
 165 {
 166         return exynos_drm_crtc_mode_set_commit(crtc, x, y, old_fb);
 167 }
 168
 169 static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
 170 {
 171         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 172
 173         exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_OFF);
 174         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 175 }
 176
 177 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 178         .dpms           = exynos_drm_crtc_dpms,
 179         .prepare        = exynos_drm_crtc_prepare,
 180         .commit         = exynos_drm_crtc_commit,
 181         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 182         .mode_set       = exynos_drm_crtc_mode_set,
 183         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 184         .disable        = exynos_drm_crtc_disable,
 185 };
 186
 187 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 188                                      struct drm_framebuffer *fb,
 189                                      struct drm_pending_vblank_event *event,
 190                                      uint32_t page_flip_flags)
 191 {
 192         struct drm_device *dev = crtc->dev;
 193         struct exynos_drm_private *dev_priv = dev->dev_private;
 194         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 195         struct drm_framebuffer *old_fb = crtc->fb;
 196         int ret = -EINVAL;
 197
 198         /* when the page flip is requested, crtc's dpms should be on */
 199         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 200                 DRM_ERROR("failed page flip request.\n");
 201                 return -EINVAL;
 202         }
 203
 204         mutex_lock(&dev->struct_mutex);
 205
 206         if (event) {
 207                 /*
 208                  * the pipe from user always is 0 so we can set pipe number
 209                  * of current owner to event.
 210                  */
 211                 event->pipe = exynos_crtc->pipe;
 212
 213                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 214                 if (ret) {
 215                         DRM_DEBUG("failed to acquire vblank counter\n");
 216
 217                         goto out;
 218                 }
 219
 220                 spin_lock_irq(&dev->event_lock);
 221                 list_add_tail(&event->base.link,
 222                                 &dev_priv->pageflip_event_list);
 223                 atomic_set(&exynos_crtc->pending_flip, 1);
 224                 spin_unlock_irq(&dev->event_lock);
 225
 226                 crtc->fb = fb;
 227                 ret = exynos_drm_crtc_mode_set_commit(crtc, crtc->x, crtc->y,
 228                                                     NULL);
 229                 if (ret) {
 230                         crtc->fb = old_fb;
 231
 232                         spin_lock_irq(&dev->event_lock);
 233                         drm_vblank_put(dev, exynos_crtc->pipe);
 234                         list_del(&event->base.link);
 235                         spin_unlock_irq(&dev->event_lock);
 236
 237                         goto out;
 238                 }
 239         }
 240 out:
 241         mutex_unlock(&dev->struct_mutex);
 242         return ret;
 243 }
 244
 245 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 246 {
 247         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 248         struct exynos_drm_private *private = crtc->dev->dev_private;
 249
 250         private->crtc[exynos_crtc->pipe] = NULL;
 251
 252         drm_crtc_cleanup(crtc);
 253         kfree(exynos_crtc);
 254 }
 255
 256 static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
 257                                         struct drm_property *property,
 258                                         uint64_t val)
 259 {
 260         struct drm_device *dev = crtc->dev;
 261         struct exynos_drm_private *dev_priv = dev->dev_private;
 262         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 263
 264         if (property == dev_priv->crtc_mode_property) {
 265                 enum exynos_crtc_mode mode = val;
 266
 267                 if (mode == exynos_crtc->mode)
 268                         return 0;
 269
 270                 exynos_crtc->mode = mode;
 271
 272                 switch (mode) {
 273                 case CRTC_MODE_NORMAL:
 274                         exynos_drm_crtc_commit(crtc);
 275                         break;
 276                 case CRTC_MODE_BLANK:
 277                         exynos_plane_dpms(exynos_crtc->plane,
 278                                           DRM_MODE_DPMS_OFF);
 279                         break;
 280                 default:
 281                         break;
 282                 }
 283
 284                 return 0;
 285         }
 286
 287         return -EINVAL;
 288 }
 289
 290 static struct drm_crtc_funcs exynos_crtc_funcs = {
 291         .set_config     = drm_crtc_helper_set_config,
 292         .page_flip      = exynos_drm_crtc_page_flip,
 293         .destroy        = exynos_drm_crtc_destroy,
 294         .set_property   = exynos_drm_crtc_set_property,
 295 };
 296
 297 static const struct drm_prop_enum_list mode_names[] = {
 298         { CRTC_MODE_NORMAL, "normal" },
 299         { CRTC_MODE_BLANK, "blank" },
 300 };
 301
 302 static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
 303 {
 304         struct drm_device *dev = crtc->dev;
 305         struct exynos_drm_private *dev_priv = dev->dev_private;
 306         struct drm_property *prop;
 307
 308         prop = dev_priv->crtc_mode_property;
 309         if (!prop) {
 310                 prop = drm_property_create_enum(dev, 0, "mode", mode_names,
 311                                                 ARRAY_SIZE(mode_names));
 312                 if (!prop)
 313                         return;
 314
 315                 dev_priv->crtc_mode_property = prop;
 316         }
 317
 318         drm_object_attach_property(&crtc->base, prop, 0);
 319 }
 320
 321 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 322 {
 323         struct exynos_drm_crtc *exynos_crtc;
 324         struct exynos_drm_private *private = dev->dev_private;
 325         struct drm_crtc *crtc;
 326
 327         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 328         if (!exynos_crtc)
 329                 return -ENOMEM;
 330
 331         exynos_crtc->pipe = nr;
 332         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 333         init_waitqueue_head(&exynos_crtc->pending_flip_queue);
 334         atomic_set(&exynos_crtc->pending_flip, 0);
 335         exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true);
 336         if (!exynos_crtc->plane) {
 337                 kfree(exynos_crtc);
 338                 return -ENOMEM;
 339         }
 340
 341         crtc = &exynos_crtc->drm_crtc;
 342
 343         private->crtc[nr] = crtc;
 344
 345         drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 346         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 347
 348         exynos_drm_crtc_attach_mode_property(crtc);
 349
 350         return 0;
 351 }
 352
 353 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 354 {
 355         struct exynos_drm_private *private = dev->dev_private;
 356         struct exynos_drm_crtc *exynos_crtc =
 357                 to_exynos_crtc(private->crtc[crtc]);
 358
 359         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 360                 return -EPERM;
 361
 362         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 363                         exynos_drm_enable_vblank);
 364
 365         return 0;
 366 }
 367
 368 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 369 {
 370         struct exynos_drm_private *private = dev->dev_private;
 371         struct exynos_drm_crtc *exynos_crtc =
 372                 to_exynos_crtc(private->crtc[crtc]);
 373
 374         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 375                 return;
 376
 377         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 378                         exynos_drm_disable_vblank);
 379 }
 380
 381 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc)
 382 {
 383         struct exynos_drm_private *dev_priv = dev->dev_private;
 384         struct drm_pending_vblank_event *e, *t;
 385         struct drm_crtc *drm_crtc = dev_priv->crtc[crtc];
 386         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc);
 387         unsigned long flags;
 388
 389         spin_lock_irqsave(&dev->event_lock, flags);
 390
 391         list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 392                         base.link) {
 393                 /* if event's pipe isn't same as crtc then ignore it. */
 394                 if (crtc != e->pipe)
 395                         continue;
 396
 397                 list_del(&e->base.link);
 398                 drm_send_vblank_event(dev, -1, e);
 399                 drm_vblank_put(dev, crtc);
 400                 atomic_set(&exynos_crtc->pending_flip, 0);
 401                 wake_up(&exynos_crtc->pending_flip_queue);
 402         }
 403
 404         spin_unlock_irqrestore(&dev->event_lock, flags);
 405 }