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_drv.h"
  19 #include "exynos_drm_encoder.h"
  20 #include "exynos_drm_plane.h"
  21
  22 #define to_exynos_crtc(x)       container_of(x, struct exynos_drm_crtc,\
  23                                 drm_crtc)
  24
  25 enum exynos_crtc_mode {
  26         CRTC_MODE_NORMAL,       /* normal mode */
  27         CRTC_MODE_BLANK,        /* The private plane of crtc is blank */
  28 };
  29
  30 /*
  31  * Exynos specific crtc structure.
  32  *
  33  * @drm_crtc: crtc object.
  34  * @drm_plane: pointer of private plane object for this crtc
  35  * @pipe: a crtc index created at load() with a new crtc object creation
  36  *      and the crtc object would be set to private->crtc array
  37  *      to get a crtc object corresponding to this pipe from private->crtc
  38  *      array when irq interrupt occured. the reason of using this pipe is that
  39  *      drm framework doesn't support multiple irq yet.
  40  *      we can refer to the crtc to current hardware interrupt occured through
  41  *      this pipe value.
  42  * @dpms: store the crtc dpms value
  43  * @mode: store the crtc mode value
  44  */
  45 struct exynos_drm_crtc {
  46         struct drm_crtc                 drm_crtc;
  47         struct drm_plane                *plane;
  48         unsigned int                    pipe;
  49         unsigned int                    dpms;
  50         enum exynos_crtc_mode           mode;
  51 };
  52
  53 static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
  54 {
  55         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  56
  57         DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);
  58
  59         if (exynos_crtc->dpms == mode) {
  60                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
  61                 return;
  62         }
  63
  64         exynos_drm_fn_encoder(crtc, &mode, exynos_drm_encoder_crtc_dpms);
  65         exynos_crtc->dpms = mode;
  66 }
  67
  68 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
  69 {
  70         DRM_DEBUG_KMS("%s\n", __FILE__);
  71
  72         /* drm framework doesn't check NULL. */
  73 }
  74
  75 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
  76 {
  77         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  78
  79         DRM_DEBUG_KMS("%s\n", __FILE__);
  80
  81         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
  82         exynos_plane_commit(exynos_crtc->plane);
  83         exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_ON);
  84 }
  85
  86 static bool
  87 exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  88                             const struct drm_display_mode *mode,
  89                             struct drm_display_mode *adjusted_mode)
  90 {
  91         DRM_DEBUG_KMS("%s\n", __FILE__);
  92
  93         /* drm framework doesn't check NULL */
  94         return true;
  95 }
  96
  97 static int
  98 exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
  99                           struct drm_display_mode *adjusted_mode, int x, int y,
 100                           struct drm_framebuffer *old_fb)
 101 {
 102         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 103         struct drm_plane *plane = exynos_crtc->plane;
 104         unsigned int crtc_w;
 105         unsigned int crtc_h;
 106         int pipe = exynos_crtc->pipe;
 107         int ret;
 108
 109         DRM_DEBUG_KMS("%s\n", __FILE__);
 110
 111         /*
 112          * copy the mode data adjusted by mode_fixup() into crtc->mode
 113          * so that hardware can be seet to proper mode.
 114          */
 115         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 116
 117         crtc_w = crtc->fb->width - x;
 118         crtc_h = crtc->fb->height - y;
 119
 120         ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
 121                                     x, y, crtc_w, crtc_h);
 122         if (ret)
 123                 return ret;
 124
 125         plane->crtc = crtc;
 126         plane->fb = crtc->fb;
 127
 128         exynos_drm_fn_encoder(crtc, &pipe, exynos_drm_encoder_crtc_pipe);
 129
 130         return 0;
 131 }
 132
 133 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 134                                           struct drm_framebuffer *old_fb)
 135 {
 136         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 137         struct drm_plane *plane = exynos_crtc->plane;
 138         unsigned int crtc_w;
 139         unsigned int crtc_h;
 140         int ret;
 141
 142         DRM_DEBUG_KMS("%s\n", __FILE__);
 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 void exynos_drm_crtc_load_lut(struct drm_crtc *crtc)
 164 {
 165         DRM_DEBUG_KMS("%s\n", __FILE__);
 166         /* drm framework doesn't check NULL */
 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         DRM_DEBUG_KMS("%s\n", __FILE__);
 174
 175         exynos_plane_dpms(exynos_crtc->plane, DRM_MODE_DPMS_OFF);
 176         exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 177 }
 178
 179 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 180         .dpms           = exynos_drm_crtc_dpms,
 181         .prepare        = exynos_drm_crtc_prepare,
 182         .commit         = exynos_drm_crtc_commit,
 183         .mode_fixup     = exynos_drm_crtc_mode_fixup,
 184         .mode_set       = exynos_drm_crtc_mode_set,
 185         .mode_set_base  = exynos_drm_crtc_mode_set_base,
 186         .load_lut       = exynos_drm_crtc_load_lut,
 187         .disable        = exynos_drm_crtc_disable,
 188 };
 189
 190 static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 191                                       struct drm_framebuffer *fb,
 192                                       struct drm_pending_vblank_event *event)
 193 {
 194         struct drm_device *dev = crtc->dev;
 195         struct exynos_drm_private *dev_priv = dev->dev_private;
 196         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 197         struct drm_framebuffer *old_fb = crtc->fb;
 198         int ret = -EINVAL;
 199
 200         DRM_DEBUG_KMS("%s\n", __FILE__);
 201
 202         /* when the page flip is requested, crtc's dpms should be on */
 203         if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
 204                 DRM_ERROR("failed page flip request.\n");
 205                 return -EINVAL;
 206         }
 207
 208         mutex_lock(&dev->struct_mutex);
 209
 210         if (event) {
 211                 /*
 212                  * the pipe from user always is 0 so we can set pipe number
 213                  * of current owner to event.
 214                  */
 215                 event->pipe = exynos_crtc->pipe;
 216
 217                 ret = drm_vblank_get(dev, exynos_crtc->pipe);
 218                 if (ret) {
 219                         DRM_DEBUG("failed to acquire vblank counter\n");
 220                         list_del(&event->base.link);
 221
 222                         goto out;
 223                 }
 224
 225                 spin_lock_irq(&dev->event_lock);
 226                 list_add_tail(&event->base.link,
 227                                 &dev_priv->pageflip_event_list);
 228                 spin_unlock_irq(&dev->event_lock);
 229
 230                 crtc->fb = fb;
 231                 ret = exynos_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y,
 232                                                     NULL);
 233                 if (ret) {
 234                         crtc->fb = old_fb;
 235
 236                         spin_lock_irq(&dev->event_lock);
 237                         drm_vblank_put(dev, exynos_crtc->pipe);
 238                         list_del(&event->base.link);
 239                         spin_unlock_irq(&dev->event_lock);
 240
 241                         goto out;
 242                 }
 243         }
 244 out:
 245         mutex_unlock(&dev->struct_mutex);
 246         return ret;
 247 }
 248
 249 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
 250 {
 251         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 252         struct exynos_drm_private *private = crtc->dev->dev_private;
 253
 254         DRM_DEBUG_KMS("%s\n", __FILE__);
 255
 256         private->crtc[exynos_crtc->pipe] = NULL;
 257
 258         drm_crtc_cleanup(crtc);
 259         kfree(exynos_crtc);
 260 }
 261
 262 static int exynos_drm_crtc_set_property(struct drm_crtc *crtc,
 263                                         struct drm_property *property,
 264                                         uint64_t val)
 265 {
 266         struct drm_device *dev = crtc->dev;
 267         struct exynos_drm_private *dev_priv = dev->dev_private;
 268         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 269
 270         DRM_DEBUG_KMS("%s\n", __func__);
 271
 272         if (property == dev_priv->crtc_mode_property) {
 273                 enum exynos_crtc_mode mode = val;
 274
 275                 if (mode == exynos_crtc->mode)
 276                         return 0;
 277
 278                 exynos_crtc->mode = mode;
 279
 280                 switch (mode) {
 281                 case CRTC_MODE_NORMAL:
 282                         exynos_drm_crtc_commit(crtc);
 283                         break;
 284                 case CRTC_MODE_BLANK:
 285                         exynos_plane_dpms(exynos_crtc->plane,
 286                                           DRM_MODE_DPMS_OFF);
 287                         break;
 288                 default:
 289                         break;
 290                 }
 291
 292                 return 0;
 293         }
 294
 295         return -EINVAL;
 296 }
 297
 298 static struct drm_crtc_funcs exynos_crtc_funcs = {
 299         .set_config     = drm_crtc_helper_set_config,
 300         .page_flip      = exynos_drm_crtc_page_flip,
 301         .destroy        = exynos_drm_crtc_destroy,
 302         .set_property   = exynos_drm_crtc_set_property,
 303 };
 304
 305 static const struct drm_prop_enum_list mode_names[] = {
 306         { CRTC_MODE_NORMAL, "normal" },
 307         { CRTC_MODE_BLANK, "blank" },
 308 };
 309
 310 static void exynos_drm_crtc_attach_mode_property(struct drm_crtc *crtc)
 311 {
 312         struct drm_device *dev = crtc->dev;
 313         struct exynos_drm_private *dev_priv = dev->dev_private;
 314         struct drm_property *prop;
 315
 316         DRM_DEBUG_KMS("%s\n", __func__);
 317
 318         prop = dev_priv->crtc_mode_property;
 319         if (!prop) {
 320                 prop = drm_property_create_enum(dev, 0, "mode", mode_names,
 321                                                 ARRAY_SIZE(mode_names));
 322                 if (!prop)
 323                         return;
 324
 325                 dev_priv->crtc_mode_property = prop;
 326         }
 327
 328         drm_object_attach_property(&crtc->base, prop, 0);
 329 }
 330
 331 int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
 332 {
 333         struct exynos_drm_crtc *exynos_crtc;
 334         struct exynos_drm_private *private = dev->dev_private;
 335         struct drm_crtc *crtc;
 336
 337         DRM_DEBUG_KMS("%s\n", __FILE__);
 338
 339         exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 340         if (!exynos_crtc) {
 341                 DRM_ERROR("failed to allocate exynos crtc\n");
 342                 return -ENOMEM;
 343         }
 344
 345         exynos_crtc->pipe = nr;
 346         exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
 347         exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true);
 348         if (!exynos_crtc->plane) {
 349                 kfree(exynos_crtc);
 350                 return -ENOMEM;
 351         }
 352
 353         crtc = &exynos_crtc->drm_crtc;
 354
 355         private->crtc[nr] = crtc;
 356
 357         drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
 358         drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
 359
 360         exynos_drm_crtc_attach_mode_property(crtc);
 361
 362         return 0;
 363 }
 364
 365 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 366 {
 367         struct exynos_drm_private *private = dev->dev_private;
 368         struct exynos_drm_crtc *exynos_crtc =
 369                 to_exynos_crtc(private->crtc[crtc]);
 370
 371         DRM_DEBUG_KMS("%s\n", __FILE__);
 372
 373         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 374                 return -EPERM;
 375
 376         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 377                         exynos_drm_enable_vblank);
 378
 379         return 0;
 380 }
 381
 382 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 383 {
 384         struct exynos_drm_private *private = dev->dev_private;
 385         struct exynos_drm_crtc *exynos_crtc =
 386                 to_exynos_crtc(private->crtc[crtc]);
 387
 388         DRM_DEBUG_KMS("%s\n", __FILE__);
 389
 390         if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
 391                 return;
 392
 393         exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
 394                         exynos_drm_disable_vblank);
 395 }
 396
 397 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc)
 398 {
 399         struct exynos_drm_private *dev_priv = dev->dev_private;
 400         struct drm_pending_vblank_event *e, *t;
 401         struct timeval now;
 402         unsigned long flags;
 403
 404         DRM_DEBUG_KMS("%s\n", __FILE__);
 405
 406         spin_lock_irqsave(&dev->event_lock, flags);
 407
 408         list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 409                         base.link) {
 410                 /* if event's pipe isn't same as crtc then ignore it. */
 411                 if (crtc != e->pipe)
 412                         continue;
 413
 414                 do_gettimeofday(&now);
 415                 e->event.sequence = 0;
 416                 e->event.tv_sec = now.tv_sec;
 417                 e->event.tv_usec = now.tv_usec;
 418
 419                 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
 420                 wake_up_interruptible(&e->base.file_priv->event_wait);
 421                 drm_vblank_put(dev, crtc);
 422         }
 423
 424         spin_unlock_irqrestore(&dev->event_lock, flags);
 425 }