drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/kernel.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/slab.h>
  35 #include <linux/fb.h>
  36 #include <linux/module.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_crtc_helper.h>
  41
  42 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 /**
  45  * DOC: fbdev helpers
  46  *
  47  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  48  * mode setting driver. They can be used mostly independently from the crtc
  49  * helper functions used by many drivers to implement the kernel mode setting
  50  * interfaces.
  51  *
  52  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  53  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  54  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  55  * default behaviour can override the third step with their own code.
  56  * Teardown is done with drm_fb_helper_fini().
  57  *
  58  * At runtime drivers should restore the fbdev console by calling
  59  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  60  * should also notify the fb helper code from updates to the output
  61  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  62  * integration with the output polling code in drm_crtc_helper.c the modeset
  63  * code provides a ->output_poll_changed callback.
  64  *
  65  * All other functions exported by the fb helper library can be used to
  66  * implement the fbdev driver interface by the driver.
  67  *
  68  * It is possible, though perhaps somewhat tricky, to implement race-free
  69  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  70  * helper must be called first to initialize the minimum required to make
  71  * hotplug detection work. Drivers also need to make sure to properly set up
  72  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  73  * it is safe to enable interrupts and start processing hotplug events. At the
  74  * same time, drivers should initialize all modeset objects such as CRTCs,
  75  * encoders and connectors. To finish up the fbdev helper initialization, the
  76  * drm_fb_helper_init() function is called. To probe for all attached displays
  77  * and set up an initial configuration using the detected hardware, drivers
  78  * should call drm_fb_helper_single_add_all_connectors() followed by
  79  * drm_fb_helper_initial_config().
  80  */
  81
  82 /**
  83  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  84  *                                             emulation helper
  85  * @fb_helper: fbdev initialized with drm_fb_helper_init
  86  *
  87  * This functions adds all the available connectors for use with the given
  88  * fb_helper. This is a separate step to allow drivers to freely assign
  89  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  90  * not adequate to be used for the fbcon.
  91  *
  92  * This function is protected against concurrent connector hotadds/removals
  93  * using drm_fb_helper_add_one_connector() and
  94  * drm_fb_helper_remove_one_connector().
  95  */
  96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  97 {
  98         struct drm_device *dev = fb_helper->dev;
  99         struct drm_connector *connector;
 100         int i;
 101
 102         mutex_lock(&dev->mode_config.mutex);
 103         drm_for_each_connector(connector, dev) {
 104                 struct drm_fb_helper_connector *fb_helper_connector;
 105
 106                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 107                 if (!fb_helper_connector)
 108                         goto fail;
 109
 110                 fb_helper_connector->connector = connector;
 111                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 112         }
 113         mutex_unlock(&dev->mode_config.mutex);
 114         return 0;
 115 fail:
 116         for (i = 0; i < fb_helper->connector_count; i++) {
 117                 kfree(fb_helper->connector_info[i]);
 118                 fb_helper->connector_info[i] = NULL;
 119         }
 120         fb_helper->connector_count = 0;
 121         mutex_unlock(&dev->mode_config.mutex);
 122
 123         return -ENOMEM;
 124 }
 125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 126
 127 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 128 {
 129         struct drm_fb_helper_connector **temp;
 130         struct drm_fb_helper_connector *fb_helper_connector;
 131
 132         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 133         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 134                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 135                 if (!temp)
 136                         return -ENOMEM;
 137
 138                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 139                 fb_helper->connector_info = temp;
 140         }
 141
 142
 143         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 144         if (!fb_helper_connector)
 145                 return -ENOMEM;
 146
 147         fb_helper_connector->connector = connector;
 148         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 152
 153 static void remove_from_modeset(struct drm_mode_set *set,
 154                 struct drm_connector *connector)
 155 {
 156         int i, j;
 157
 158         for (i = 0; i < set->num_connectors; i++) {
 159                 if (set->connectors[i] == connector)
 160                         break;
 161         }
 162
 163         if (i == set->num_connectors)
 164                 return;
 165
 166         for (j = i + 1; j < set->num_connectors; j++) {
 167                 set->connectors[j - 1] = set->connectors[j];
 168         }
 169         set->num_connectors--;
 170
 171         /* because i915 is pissy about this..
 172          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 173          */
 174         if (set->num_connectors == 0)
 175                 set->fb = NULL;
 176 }
 177
 178 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 179                                        struct drm_connector *connector)
 180 {
 181         struct drm_fb_helper_connector *fb_helper_connector;
 182         int i, j;
 183
 184         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 185
 186         for (i = 0; i < fb_helper->connector_count; i++) {
 187                 if (fb_helper->connector_info[i]->connector == connector)
 188                         break;
 189         }
 190
 191         if (i == fb_helper->connector_count)
 192                 return -EINVAL;
 193         fb_helper_connector = fb_helper->connector_info[i];
 194
 195         for (j = i + 1; j < fb_helper->connector_count; j++) {
 196                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 197         }
 198         fb_helper->connector_count--;
 199         kfree(fb_helper_connector);
 200
 201         /* also cleanup dangling references to the connector: */
 202         for (i = 0; i < fb_helper->crtc_count; i++)
 203                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 204
 205         return 0;
 206 }
 207 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 208
 209 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 210 {
 211         uint16_t *r_base, *g_base, *b_base;
 212         int i;
 213
 214         if (helper->funcs->gamma_get == NULL)
 215                 return;
 216
 217         r_base = crtc->gamma_store;
 218         g_base = r_base + crtc->gamma_size;
 219         b_base = g_base + crtc->gamma_size;
 220
 221         for (i = 0; i < crtc->gamma_size; i++)
 222                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 223 }
 224
 225 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 226 {
 227         uint16_t *r_base, *g_base, *b_base;
 228
 229         if (crtc->funcs->gamma_set == NULL)
 230                 return;
 231
 232         r_base = crtc->gamma_store;
 233         g_base = r_base + crtc->gamma_size;
 234         b_base = g_base + crtc->gamma_size;
 235
 236         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 237 }
 238
 239 /**
 240  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 241  * @info: fbdev registered by the helper
 242  */
 243 int drm_fb_helper_debug_enter(struct fb_info *info)
 244 {
 245         struct drm_fb_helper *helper = info->par;
 246         const struct drm_crtc_helper_funcs *funcs;
 247         int i;
 248
 249         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 250                 for (i = 0; i < helper->crtc_count; i++) {
 251                         struct drm_mode_set *mode_set =
 252                                 &helper->crtc_info[i].mode_set;
 253
 254                         if (!mode_set->crtc->enabled)
 255                                 continue;
 256
 257                         funcs = mode_set->crtc->helper_private;
 258                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 259                         funcs->mode_set_base_atomic(mode_set->crtc,
 260                                                     mode_set->fb,
 261                                                     mode_set->x,
 262                                                     mode_set->y,
 263                                                     ENTER_ATOMIC_MODE_SET);
 264                 }
 265         }
 266
 267         return 0;
 268 }
 269 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 270
 271 /* Find the real fb for a given fb helper CRTC */
 272 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 273 {
 274         struct drm_device *dev = crtc->dev;
 275         struct drm_crtc *c;
 276
 277         drm_for_each_crtc(c, dev) {
 278                 if (crtc->base.id == c->base.id)
 279                         return c->primary->fb;
 280         }
 281
 282         return NULL;
 283 }
 284
 285 /**
 286  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 287  * @info: fbdev registered by the helper
 288  */
 289 int drm_fb_helper_debug_leave(struct fb_info *info)
 290 {
 291         struct drm_fb_helper *helper = info->par;
 292         struct drm_crtc *crtc;
 293         const struct drm_crtc_helper_funcs *funcs;
 294         struct drm_framebuffer *fb;
 295         int i;
 296
 297         for (i = 0; i < helper->crtc_count; i++) {
 298                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 299                 crtc = mode_set->crtc;
 300                 funcs = crtc->helper_private;
 301                 fb = drm_mode_config_fb(crtc);
 302
 303                 if (!crtc->enabled)
 304                         continue;
 305
 306                 if (!fb) {
 307                         DRM_ERROR("no fb to restore??\n");
 308                         continue;
 309                 }
 310
 311                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 312                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 313                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 314         }
 315
 316         return 0;
 317 }
 318 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 319
 320 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 321 {
 322         struct drm_device *dev = fb_helper->dev;
 323         struct drm_plane *plane;
 324         bool error = false;
 325         int i;
 326
 327         drm_warn_on_modeset_not_all_locked(dev);
 328
 329         drm_for_each_plane(plane, dev) {
 330                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 331                         drm_plane_force_disable(plane);
 332
 333                 if (dev->mode_config.rotation_property) {
 334                         drm_mode_plane_set_obj_prop(plane,
 335                                                     dev->mode_config.rotation_property,
 336                                                     BIT(DRM_ROTATE_0));
 337                 }
 338         }
 339
 340         for (i = 0; i < fb_helper->crtc_count; i++) {
 341                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 342                 struct drm_crtc *crtc = mode_set->crtc;
 343                 int ret;
 344
 345                 if (crtc->funcs->cursor_set) {
 346                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 347                         if (ret)
 348                                 error = true;
 349                 }
 350
 351                 ret = drm_mode_set_config_internal(mode_set);
 352                 if (ret)
 353                         error = true;
 354         }
 355         return error;
 356 }
 357 /**
 358  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 359  * @fb_helper: fbcon to restore
 360  *
 361  * This should be called from driver's drm ->lastclose callback
 362  * when implementing an fbcon on top of kms using this helper. This ensures that
 363  * the user isn't greeted with a black screen when e.g. X dies.
 364  *
 365  * Use this variant if you need to bypass locking (panic), or already
 366  * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
 367  */
 368 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 369 {
 370         return restore_fbdev_mode(fb_helper);
 371 }
 372
 373 /**
 374  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 375  * @fb_helper: fbcon to restore
 376  *
 377  * This should be called from driver's drm ->lastclose callback
 378  * when implementing an fbcon on top of kms using this helper. This ensures that
 379  * the user isn't greeted with a black screen when e.g. X dies.
 380  */
 381 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 382 {
 383         struct drm_device *dev = fb_helper->dev;
 384         bool ret;
 385         bool do_delayed = false;
 386
 387         drm_modeset_lock_all(dev);
 388         ret = restore_fbdev_mode(fb_helper);
 389
 390         do_delayed = fb_helper->delayed_hotplug;
 391         if (do_delayed)
 392                 fb_helper->delayed_hotplug = false;
 393         drm_modeset_unlock_all(dev);
 394
 395         if (do_delayed)
 396                 drm_fb_helper_hotplug_event(fb_helper);
 397         return ret;
 398 }
 399 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 400
 401 /*
 402  * restore fbcon display for all kms driver's using this helper, used for sysrq
 403  * and panic handling.
 404  */
 405 static bool drm_fb_helper_force_kernel_mode(void)
 406 {
 407         bool ret, error = false;
 408         struct drm_fb_helper *helper;
 409
 410         if (list_empty(&kernel_fb_helper_list))
 411                 return false;
 412
 413         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 414                 struct drm_device *dev = helper->dev;
 415
 416                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 417                         continue;
 418
 419                 drm_modeset_lock_all(dev);
 420                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 421                 if (ret)
 422                         error = true;
 423                 drm_modeset_unlock_all(dev);
 424         }
 425         return error;
 426 }
 427
 428 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 429 {
 430         struct drm_device *dev = fb_helper->dev;
 431         struct drm_crtc *crtc;
 432         int bound = 0, crtcs_bound = 0;
 433
 434         /* Sometimes user space wants everything disabled, so don't steal the
 435          * display if there's a master. */
 436         if (dev->primary->master)
 437                 return false;
 438
 439         drm_for_each_crtc(crtc, dev) {
 440                 if (crtc->primary->fb)
 441                         crtcs_bound++;
 442                 if (crtc->primary->fb == fb_helper->fb)
 443                         bound++;
 444         }
 445
 446         if (bound < crtcs_bound)
 447                 return false;
 448
 449         return true;
 450 }
 451
 452 #ifdef CONFIG_MAGIC_SYSRQ
 453 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 454 {
 455         bool ret;
 456         ret = drm_fb_helper_force_kernel_mode();
 457         if (ret == true)
 458                 DRM_ERROR("Failed to restore crtc configuration\n");
 459 }
 460 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 461
 462 static void drm_fb_helper_sysrq(int dummy1)
 463 {
 464         schedule_work(&drm_fb_helper_restore_work);
 465 }
 466
 467 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 468         .handler = drm_fb_helper_sysrq,
 469         .help_msg = "force-fb(V)",
 470         .action_msg = "Restore framebuffer console",
 471 };
 472 #else
 473 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 474 #endif
 475
 476 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 477 {
 478         struct drm_fb_helper *fb_helper = info->par;
 479         struct drm_device *dev = fb_helper->dev;
 480         struct drm_crtc *crtc;
 481         struct drm_connector *connector;
 482         int i, j;
 483
 484         /*
 485          * For each CRTC in this fb, turn the connectors on/off.
 486          */
 487         drm_modeset_lock_all(dev);
 488         if (!drm_fb_helper_is_bound(fb_helper)) {
 489                 drm_modeset_unlock_all(dev);
 490                 return;
 491         }
 492
 493         for (i = 0; i < fb_helper->crtc_count; i++) {
 494                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 495
 496                 if (!crtc->enabled)
 497                         continue;
 498
 499                 /* Walk the connectors & encoders on this fb turning them on/off */
 500                 for (j = 0; j < fb_helper->connector_count; j++) {
 501                         connector = fb_helper->connector_info[j]->connector;
 502                         connector->funcs->dpms(connector, dpms_mode);
 503                         drm_object_property_set_value(&connector->base,
 504                                 dev->mode_config.dpms_property, dpms_mode);
 505                 }
 506         }
 507         drm_modeset_unlock_all(dev);
 508 }
 509
 510 /**
 511  * drm_fb_helper_blank - implementation for ->fb_blank
 512  * @blank: desired blanking state
 513  * @info: fbdev registered by the helper
 514  */
 515 int drm_fb_helper_blank(int blank, struct fb_info *info)
 516 {
 517         if (oops_in_progress)
 518                 return -EBUSY;
 519
 520         switch (blank) {
 521         /* Display: On; HSync: On, VSync: On */
 522         case FB_BLANK_UNBLANK:
 523                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 524                 break;
 525         /* Display: Off; HSync: On, VSync: On */
 526         case FB_BLANK_NORMAL:
 527                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 528                 break;
 529         /* Display: Off; HSync: Off, VSync: On */
 530         case FB_BLANK_HSYNC_SUSPEND:
 531                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 532                 break;
 533         /* Display: Off; HSync: On, VSync: Off */
 534         case FB_BLANK_VSYNC_SUSPEND:
 535                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 536                 break;
 537         /* Display: Off; HSync: Off, VSync: Off */
 538         case FB_BLANK_POWERDOWN:
 539                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 540                 break;
 541         }
 542         return 0;
 543 }
 544 EXPORT_SYMBOL(drm_fb_helper_blank);
 545
 546 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 547 {
 548         int i;
 549
 550         for (i = 0; i < helper->connector_count; i++)
 551                 kfree(helper->connector_info[i]);
 552         kfree(helper->connector_info);
 553         for (i = 0; i < helper->crtc_count; i++) {
 554                 kfree(helper->crtc_info[i].mode_set.connectors);
 555                 if (helper->crtc_info[i].mode_set.mode)
 556                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 557         }
 558         kfree(helper->crtc_info);
 559 }
 560
 561 /**
 562  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 563  * @dev: DRM device
 564  * @helper: driver-allocated fbdev helper structure to set up
 565  * @funcs: pointer to structure of functions associate with this helper
 566  *
 567  * Sets up the bare minimum to make the framebuffer helper usable. This is
 568  * useful to implement race-free initialization of the polling helpers.
 569  */
 570 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 571                            const struct drm_fb_helper_funcs *funcs)
 572 {
 573         INIT_LIST_HEAD(&helper->kernel_fb_list);
 574         helper->funcs = funcs;
 575         helper->dev = dev;
 576 }
 577 EXPORT_SYMBOL(drm_fb_helper_prepare);
 578
 579 /**
 580  * drm_fb_helper_init - initialize a drm_fb_helper structure
 581  * @dev: drm device
 582  * @fb_helper: driver-allocated fbdev helper structure to initialize
 583  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 584  * @max_conn_count: max connector count
 585  *
 586  * This allocates the structures for the fbdev helper with the given limits.
 587  * Note that this won't yet touch the hardware (through the driver interfaces)
 588  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 589  * to allow driver writes more control over the exact init sequence.
 590  *
 591  * Drivers must call drm_fb_helper_prepare() before calling this function.
 592  *
 593  * RETURNS:
 594  * Zero if everything went ok, nonzero otherwise.
 595  */
 596 int drm_fb_helper_init(struct drm_device *dev,
 597                        struct drm_fb_helper *fb_helper,
 598                        int crtc_count, int max_conn_count)
 599 {
 600         struct drm_crtc *crtc;
 601         int i;
 602
 603         if (!max_conn_count)
 604                 return -EINVAL;
 605
 606         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 607         if (!fb_helper->crtc_info)
 608                 return -ENOMEM;
 609
 610         fb_helper->crtc_count = crtc_count;
 611         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 612         if (!fb_helper->connector_info) {
 613                 kfree(fb_helper->crtc_info);
 614                 return -ENOMEM;
 615         }
 616         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 617         fb_helper->connector_count = 0;
 618
 619         for (i = 0; i < crtc_count; i++) {
 620                 fb_helper->crtc_info[i].mode_set.connectors =
 621                         kcalloc(max_conn_count,
 622                                 sizeof(struct drm_connector *),
 623                                 GFP_KERNEL);
 624
 625                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 626                         goto out_free;
 627                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 628         }
 629
 630         i = 0;
 631         drm_for_each_crtc(crtc, dev) {
 632                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 633                 i++;
 634         }
 635
 636         return 0;
 637 out_free:
 638         drm_fb_helper_crtc_free(fb_helper);
 639         return -ENOMEM;
 640 }
 641 EXPORT_SYMBOL(drm_fb_helper_init);
 642
 643 /**
 644  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 645  * @fb_helper: driver-allocated fbdev helper
 646  *
 647  * A helper to alloc fb_info and the members cmap and apertures. Called
 648  * by the driver within the fb_probe fb_helper callback function.
 649  *
 650  * RETURNS:
 651  * fb_info pointer if things went okay, pointer containing error code
 652  * otherwise
 653  */
 654 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 655 {
 656         struct device *dev = fb_helper->dev->dev;
 657         struct fb_info *info;
 658         int ret;
 659
 660         info = framebuffer_alloc(0, dev);
 661         if (!info)
 662                 return ERR_PTR(-ENOMEM);
 663
 664         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 665         if (ret)
 666                 goto err_release;
 667
 668         info->apertures = alloc_apertures(1);
 669         if (!info->apertures) {
 670                 ret = -ENOMEM;
 671                 goto err_free_cmap;
 672         }
 673
 674         fb_helper->fbdev = info;
 675
 676         return info;
 677
 678 err_free_cmap:
 679         fb_dealloc_cmap(&info->cmap);
 680 err_release:
 681         framebuffer_release(info);
 682         return ERR_PTR(ret);
 683 }
 684 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 685
 686 /**
 687  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 688  * @fb_helper: driver-allocated fbdev helper
 689  *
 690  * A wrapper around unregister_framebuffer, to release the fb_info
 691  * framebuffer device
 692  */
 693 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 694 {
 695         if (fb_helper && fb_helper->fbdev)
 696                 unregister_framebuffer(fb_helper->fbdev);
 697 }
 698 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 699
 700 /**
 701  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 702  * @fb_helper: driver-allocated fbdev helper
 703  *
 704  * A helper to free memory taken by fb_info and the members cmap and
 705  * apertures
 706  */
 707 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 708 {
 709         if (fb_helper) {
 710                 struct fb_info *info = fb_helper->fbdev;
 711
 712                 if (info) {
 713                         if (info->cmap.len)
 714                                 fb_dealloc_cmap(&info->cmap);
 715                         framebuffer_release(info);
 716                 }
 717
 718                 fb_helper->fbdev = NULL;
 719         }
 720 }
 721 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 722
 723 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 724 {
 725         if (!list_empty(&fb_helper->kernel_fb_list)) {
 726                 list_del(&fb_helper->kernel_fb_list);
 727                 if (list_empty(&kernel_fb_helper_list)) {
 728                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 729                 }
 730         }
 731
 732         drm_fb_helper_crtc_free(fb_helper);
 733
 734 }
 735 EXPORT_SYMBOL(drm_fb_helper_fini);
 736
 737 /**
 738  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 739  * @fb_helper: driver-allocated fbdev helper
 740  *
 741  * A wrapper around unlink_framebuffer implemented by fbdev core
 742  */
 743 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 744 {
 745         if (fb_helper && fb_helper->fbdev)
 746                 unlink_framebuffer(fb_helper->fbdev);
 747 }
 748 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 749
 750 /**
 751  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 752  * @info: fb_info struct pointer
 753  * @buf: userspace buffer to read from framebuffer memory
 754  * @count: number of bytes to read from framebuffer memory
 755  * @ppos: read offset within framebuffer memory
 756  *
 757  * A wrapper around fb_sys_read implemented by fbdev core
 758  */
 759 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 760                                size_t count, loff_t *ppos)
 761 {
 762         return fb_sys_read(info, buf, count, ppos);
 763 }
 764 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 765
 766 /**
 767  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 768  * @info: fb_info struct pointer
 769  * @buf: userspace buffer to write to framebuffer memory
 770  * @count: number of bytes to write to framebuffer memory
 771  * @ppos: write offset within framebuffer memory
 772  *
 773  * A wrapper around fb_sys_write implemented by fbdev core
 774  */
 775 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 776                                 size_t count, loff_t *ppos)
 777 {
 778         return fb_sys_write(info, buf, count, ppos);
 779 }
 780 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 781
 782 /**
 783  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 784  * @info: fbdev registered by the helper
 785  * @rect: info about rectangle to fill
 786  *
 787  * A wrapper around sys_fillrect implemented by fbdev core
 788  */
 789 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 790                                 const struct fb_fillrect *rect)
 791 {
 792         sys_fillrect(info, rect);
 793 }
 794 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 795
 796 /**
 797  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 798  * @info: fbdev registered by the helper
 799  * @area: info about area to copy
 800  *
 801  * A wrapper around sys_copyarea implemented by fbdev core
 802  */
 803 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 804                                 const struct fb_copyarea *area)
 805 {
 806         sys_copyarea(info, area);
 807 }
 808 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 809
 810 /**
 811  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 812  * @info: fbdev registered by the helper
 813  * @image: info about image to blit
 814  *
 815  * A wrapper around sys_imageblit implemented by fbdev core
 816  */
 817 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 818                                  const struct fb_image *image)
 819 {
 820         sys_imageblit(info, image);
 821 }
 822 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 823
 824 /**
 825  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 826  * @info: fbdev registered by the helper
 827  * @rect: info about rectangle to fill
 828  *
 829  * A wrapper around cfb_imageblit implemented by fbdev core
 830  */
 831 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 832                                 const struct fb_fillrect *rect)
 833 {
 834         cfb_fillrect(info, rect);
 835 }
 836 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 837
 838 /**
 839  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 840  * @info: fbdev registered by the helper
 841  * @area: info about area to copy
 842  *
 843  * A wrapper around cfb_copyarea implemented by fbdev core
 844  */
 845 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 846                                 const struct fb_copyarea *area)
 847 {
 848         cfb_copyarea(info, area);
 849 }
 850 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 851
 852 /**
 853  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 854  * @info: fbdev registered by the helper
 855  * @image: info about image to blit
 856  *
 857  * A wrapper around cfb_imageblit implemented by fbdev core
 858  */
 859 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 860                                  const struct fb_image *image)
 861 {
 862         cfb_imageblit(info, image);
 863 }
 864 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 865
 866 /**
 867  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 868  * @fb_helper: driver-allocated fbdev helper
 869  * @state: desired state, zero to resume, non-zero to suspend
 870  *
 871  * A wrapper around fb_set_suspend implemented by fbdev core
 872  */
 873 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 874 {
 875         if (fb_helper && fb_helper->fbdev)
 876                 fb_set_suspend(fb_helper->fbdev, state);
 877 }
 878 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 879
 880 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 881                      u16 blue, u16 regno, struct fb_info *info)
 882 {
 883         struct drm_fb_helper *fb_helper = info->par;
 884         struct drm_framebuffer *fb = fb_helper->fb;
 885         int pindex;
 886
 887         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 888                 u32 *palette;
 889                 u32 value;
 890                 /* place color in psuedopalette */
 891                 if (regno > 16)
 892                         return -EINVAL;
 893                 palette = (u32 *)info->pseudo_palette;
 894                 red >>= (16 - info->var.red.length);
 895                 green >>= (16 - info->var.green.length);
 896                 blue >>= (16 - info->var.blue.length);
 897                 value = (red << info->var.red.offset) |
 898                         (green << info->var.green.offset) |
 899                         (blue << info->var.blue.offset);
 900                 if (info->var.transp.length > 0) {
 901                         u32 mask = (1 << info->var.transp.length) - 1;
 902                         mask <<= info->var.transp.offset;
 903                         value |= mask;
 904                 }
 905                 palette[regno] = value;
 906                 return 0;
 907         }
 908
 909         /*
 910          * The driver really shouldn't advertise pseudo/directcolor
 911          * visuals if it can't deal with the palette.
 912          */
 913         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 914                     !fb_helper->funcs->gamma_get))
 915                 return -EINVAL;
 916
 917         pindex = regno;
 918
 919         if (fb->bits_per_pixel == 16) {
 920                 pindex = regno << 3;
 921
 922                 if (fb->depth == 16 && regno > 63)
 923                         return -EINVAL;
 924                 if (fb->depth == 15 && regno > 31)
 925                         return -EINVAL;
 926
 927                 if (fb->depth == 16) {
 928                         u16 r, g, b;
 929                         int i;
 930                         if (regno < 32) {
 931                                 for (i = 0; i < 8; i++)
 932                                         fb_helper->funcs->gamma_set(crtc, red,
 933                                                 green, blue, pindex + i);
 934                         }
 935
 936                         fb_helper->funcs->gamma_get(crtc, &r,
 937                                                     &g, &b,
 938                                                     pindex >> 1);
 939
 940                         for (i = 0; i < 4; i++)
 941                                 fb_helper->funcs->gamma_set(crtc, r,
 942                                                             green, b,
 943                                                             (pindex >> 1) + i);
 944                 }
 945         }
 946
 947         if (fb->depth != 16)
 948                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 949         return 0;
 950 }
 951
 952 /**
 953  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 954  * @cmap: cmap to set
 955  * @info: fbdev registered by the helper
 956  */
 957 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 958 {
 959         struct drm_fb_helper *fb_helper = info->par;
 960         struct drm_device *dev = fb_helper->dev;
 961         const struct drm_crtc_helper_funcs *crtc_funcs;
 962         u16 *red, *green, *blue, *transp;
 963         struct drm_crtc *crtc;
 964         int i, j, rc = 0;
 965         int start;
 966
 967         if (oops_in_progress)
 968                 return -EBUSY;
 969
 970         drm_modeset_lock_all(dev);
 971         if (!drm_fb_helper_is_bound(fb_helper)) {
 972                 drm_modeset_unlock_all(dev);
 973                 return -EBUSY;
 974         }
 975
 976         for (i = 0; i < fb_helper->crtc_count; i++) {
 977                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 978                 crtc_funcs = crtc->helper_private;
 979
 980                 red = cmap->red;
 981                 green = cmap->green;
 982                 blue = cmap->blue;
 983                 transp = cmap->transp;
 984                 start = cmap->start;
 985
 986                 for (j = 0; j < cmap->len; j++) {
 987                         u16 hred, hgreen, hblue, htransp = 0xffff;
 988
 989                         hred = *red++;
 990                         hgreen = *green++;
 991                         hblue = *blue++;
 992
 993                         if (transp)
 994                                 htransp = *transp++;
 995
 996                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 997                         if (rc)
 998                                 goto out;
 999                 }
1000                 if (crtc_funcs->load_lut)
1001                         crtc_funcs->load_lut(crtc);
1002         }
1003  out:
1004         drm_modeset_unlock_all(dev);
1005         return rc;
1006 }
1007 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1008
1009 /**
1010  * drm_fb_helper_check_var - implementation for ->fb_check_var
1011  * @var: screeninfo to check
1012  * @info: fbdev registered by the helper
1013  */
1014 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1015                             struct fb_info *info)
1016 {
1017         struct drm_fb_helper *fb_helper = info->par;
1018         struct drm_framebuffer *fb = fb_helper->fb;
1019         int depth;
1020
1021         if (var->pixclock != 0 || in_dbg_master())
1022                 return -EINVAL;
1023
1024         /* Need to resize the fb object !!! */
1025         if (var->bits_per_pixel > fb->bits_per_pixel ||
1026             var->xres > fb->width || var->yres > fb->height ||
1027             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1028                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1029                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1030                           var->xres, var->yres, var->bits_per_pixel,
1031                           var->xres_virtual, var->yres_virtual,
1032                           fb->width, fb->height, fb->bits_per_pixel);
1033                 return -EINVAL;
1034         }
1035
1036         switch (var->bits_per_pixel) {
1037         case 16:
1038                 depth = (var->green.length == 6) ? 16 : 15;
1039                 break;
1040         case 32:
1041                 depth = (var->transp.length > 0) ? 32 : 24;
1042                 break;
1043         default:
1044                 depth = var->bits_per_pixel;
1045                 break;
1046         }
1047
1048         switch (depth) {
1049         case 8:
1050                 var->red.offset = 0;
1051                 var->green.offset = 0;
1052                 var->blue.offset = 0;
1053                 var->red.length = 8;
1054                 var->green.length = 8;
1055                 var->blue.length = 8;
1056                 var->transp.length = 0;
1057                 var->transp.offset = 0;
1058                 break;
1059         case 15:
1060                 var->red.offset = 10;
1061                 var->green.offset = 5;
1062                 var->blue.offset = 0;
1063                 var->red.length = 5;
1064                 var->green.length = 5;
1065                 var->blue.length = 5;
1066                 var->transp.length = 1;
1067                 var->transp.offset = 15;
1068                 break;
1069         case 16:
1070                 var->red.offset = 11;
1071                 var->green.offset = 5;
1072                 var->blue.offset = 0;
1073                 var->red.length = 5;
1074                 var->green.length = 6;
1075                 var->blue.length = 5;
1076                 var->transp.length = 0;
1077                 var->transp.offset = 0;
1078                 break;
1079         case 24:
1080                 var->red.offset = 16;
1081                 var->green.offset = 8;
1082                 var->blue.offset = 0;
1083                 var->red.length = 8;
1084                 var->green.length = 8;
1085                 var->blue.length = 8;
1086                 var->transp.length = 0;
1087                 var->transp.offset = 0;
1088                 break;
1089         case 32:
1090                 var->red.offset = 16;
1091                 var->green.offset = 8;
1092                 var->blue.offset = 0;
1093                 var->red.length = 8;
1094                 var->green.length = 8;
1095                 var->blue.length = 8;
1096                 var->transp.length = 8;
1097                 var->transp.offset = 24;
1098                 break;
1099         default:
1100                 return -EINVAL;
1101         }
1102         return 0;
1103 }
1104 EXPORT_SYMBOL(drm_fb_helper_check_var);
1105
1106 /**
1107  * drm_fb_helper_set_par - implementation for ->fb_set_par
1108  * @info: fbdev registered by the helper
1109  *
1110  * This will let fbcon do the mode init and is called at initialization time by
1111  * the fbdev core when registering the driver, and later on through the hotplug
1112  * callback.
1113  */
1114 int drm_fb_helper_set_par(struct fb_info *info)
1115 {
1116         struct drm_fb_helper *fb_helper = info->par;
1117         struct fb_var_screeninfo *var = &info->var;
1118
1119         if (oops_in_progress)
1120                 return -EBUSY;
1121
1122         if (var->pixclock != 0) {
1123                 DRM_ERROR("PIXEL CLOCK SET\n");
1124                 return -EINVAL;
1125         }
1126
1127         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1128
1129         return 0;
1130 }
1131 EXPORT_SYMBOL(drm_fb_helper_set_par);
1132
1133 /**
1134  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1135  * @var: updated screen information
1136  * @info: fbdev registered by the helper
1137  */
1138 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1139                               struct fb_info *info)
1140 {
1141         struct drm_fb_helper *fb_helper = info->par;
1142         struct drm_device *dev = fb_helper->dev;
1143         struct drm_mode_set *modeset;
1144         int ret = 0;
1145         int i;
1146
1147         if (oops_in_progress)
1148                 return -EBUSY;
1149
1150         drm_modeset_lock_all(dev);
1151         if (!drm_fb_helper_is_bound(fb_helper)) {
1152                 drm_modeset_unlock_all(dev);
1153                 return -EBUSY;
1154         }
1155
1156         for (i = 0; i < fb_helper->crtc_count; i++) {
1157                 modeset = &fb_helper->crtc_info[i].mode_set;
1158
1159                 modeset->x = var->xoffset;
1160                 modeset->y = var->yoffset;
1161
1162                 if (modeset->num_connectors) {
1163                         ret = drm_mode_set_config_internal(modeset);
1164                         if (!ret) {
1165                                 info->var.xoffset = var->xoffset;
1166                                 info->var.yoffset = var->yoffset;
1167                         }
1168                 }
1169         }
1170         drm_modeset_unlock_all(dev);
1171         return ret;
1172 }
1173 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1174
1175 /*
1176  * Allocates the backing storage and sets up the fbdev info structure through
1177  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1178  * notifier.
1179  */
1180 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1181                                          int preferred_bpp)
1182 {
1183         int ret = 0;
1184         int crtc_count = 0;
1185         int i;
1186         struct fb_info *info;
1187         struct drm_fb_helper_surface_size sizes;
1188         int gamma_size = 0;
1189
1190         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1191         sizes.surface_depth = 24;
1192         sizes.surface_bpp = 32;
1193         sizes.fb_width = (unsigned)-1;
1194         sizes.fb_height = (unsigned)-1;
1195
1196         /* if driver picks 8 or 16 by default use that
1197            for both depth/bpp */
1198         if (preferred_bpp != sizes.surface_bpp)
1199                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1200
1201         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1202         for (i = 0; i < fb_helper->connector_count; i++) {
1203                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1204                 struct drm_cmdline_mode *cmdline_mode;
1205
1206                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1207
1208                 if (cmdline_mode->bpp_specified) {
1209                         switch (cmdline_mode->bpp) {
1210                         case 8:
1211                                 sizes.surface_depth = sizes.surface_bpp = 8;
1212                                 break;
1213                         case 15:
1214                                 sizes.surface_depth = 15;
1215                                 sizes.surface_bpp = 16;
1216                                 break;
1217                         case 16:
1218                                 sizes.surface_depth = sizes.surface_bpp = 16;
1219                                 break;
1220                         case 24:
1221                                 sizes.surface_depth = sizes.surface_bpp = 24;
1222                                 break;
1223                         case 32:
1224                                 sizes.surface_depth = 24;
1225                                 sizes.surface_bpp = 32;
1226                                 break;
1227                         }
1228                         break;
1229                 }
1230         }
1231
1232         crtc_count = 0;
1233         for (i = 0; i < fb_helper->crtc_count; i++) {
1234                 struct drm_display_mode *desired_mode;
1235                 struct drm_mode_set *mode_set;
1236                 int x, y, j;
1237                 /* in case of tile group, are we the last tile vert or horiz?
1238                  * If no tile group you are always the last one both vertically
1239                  * and horizontally
1240                  */
1241                 bool lastv = true, lasth = true;
1242
1243                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1244                 mode_set = &fb_helper->crtc_info[i].mode_set;
1245
1246                 if (!desired_mode)
1247                         continue;
1248
1249                 crtc_count++;
1250
1251                 x = fb_helper->crtc_info[i].x;
1252                 y = fb_helper->crtc_info[i].y;
1253
1254                 if (gamma_size == 0)
1255                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1256
1257                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1258                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1259
1260                 for (j = 0; j < mode_set->num_connectors; j++) {
1261                         struct drm_connector *connector = mode_set->connectors[j];
1262                         if (connector->has_tile) {
1263                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1264                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1265                                 /* cloning to multiple tiles is just crazy-talk, so: */
1266                                 break;
1267                         }
1268                 }
1269
1270                 if (lasth)
1271                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1272                 if (lastv)
1273                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1274         }
1275
1276         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1277                 /* hmm everyone went away - assume VGA cable just fell out
1278                    and will come back later. */
1279                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1280                 sizes.fb_width = sizes.surface_width = 1024;
1281                 sizes.fb_height = sizes.surface_height = 768;
1282         }
1283
1284         /* push down into drivers */
1285         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1286         if (ret < 0)
1287                 return ret;
1288
1289         info = fb_helper->fbdev;
1290
1291         /*
1292          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1293          * events, but at init time drm_setup_crtcs needs to be called before
1294          * the fb is allocated (since we need to figure out the desired size of
1295          * the fb before we can allocate it ...). Hence we need to fix things up
1296          * here again.
1297          */
1298         for (i = 0; i < fb_helper->crtc_count; i++)
1299                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1300                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1301
1302
1303         info->var.pixclock = 0;
1304         if (register_framebuffer(info) < 0)
1305                 return -EINVAL;
1306
1307         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1308                         info->node, info->fix.id);
1309
1310         if (list_empty(&kernel_fb_helper_list)) {
1311                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1312         }
1313
1314         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1315
1316         return 0;
1317 }
1318
1319 /**
1320  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1321  * @info: fbdev registered by the helper
1322  * @pitch: desired pitch
1323  * @depth: desired depth
1324  *
1325  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1326  * fbdev emulations. Drivers which support acceleration methods which impose
1327  * additional constraints need to set up their own limits.
1328  *
1329  * Drivers should call this (or their equivalent setup code) from their
1330  * ->fb_probe callback.
1331  */
1332 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1333                             uint32_t depth)
1334 {
1335         info->fix.type = FB_TYPE_PACKED_PIXELS;
1336         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1337                 FB_VISUAL_TRUECOLOR;
1338         info->fix.mmio_start = 0;
1339         info->fix.mmio_len = 0;
1340         info->fix.type_aux = 0;
1341         info->fix.xpanstep = 1; /* doing it in hw */
1342         info->fix.ypanstep = 1; /* doing it in hw */
1343         info->fix.ywrapstep = 0;
1344         info->fix.accel = FB_ACCEL_NONE;
1345
1346         info->fix.line_length = pitch;
1347         return;
1348 }
1349 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1350
1351 /**
1352  * drm_fb_helper_fill_var - initalizes variable fbdev information
1353  * @info: fbdev instance to set up
1354  * @fb_helper: fb helper instance to use as template
1355  * @fb_width: desired fb width
1356  * @fb_height: desired fb height
1357  *
1358  * Sets up the variable fbdev metainformation from the given fb helper instance
1359  * and the drm framebuffer allocated in fb_helper->fb.
1360  *
1361  * Drivers should call this (or their equivalent setup code) from their
1362  * ->fb_probe callback after having allocated the fbdev backing
1363  * storage framebuffer.
1364  */
1365 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1366                             uint32_t fb_width, uint32_t fb_height)
1367 {
1368         struct drm_framebuffer *fb = fb_helper->fb;
1369         info->pseudo_palette = fb_helper->pseudo_palette;
1370         info->var.xres_virtual = fb->width;
1371         info->var.yres_virtual = fb->height;
1372         info->var.bits_per_pixel = fb->bits_per_pixel;
1373         info->var.accel_flags = FB_ACCELF_TEXT;
1374         info->var.xoffset = 0;
1375         info->var.yoffset = 0;
1376         info->var.activate = FB_ACTIVATE_NOW;
1377         info->var.height = -1;
1378         info->var.width = -1;
1379
1380         switch (fb->depth) {
1381         case 8:
1382                 info->var.red.offset = 0;
1383                 info->var.green.offset = 0;
1384                 info->var.blue.offset = 0;
1385                 info->var.red.length = 8; /* 8bit DAC */
1386                 info->var.green.length = 8;
1387                 info->var.blue.length = 8;
1388                 info->var.transp.offset = 0;
1389                 info->var.transp.length = 0;
1390                 break;
1391         case 15:
1392                 info->var.red.offset = 10;
1393                 info->var.green.offset = 5;
1394                 info->var.blue.offset = 0;
1395                 info->var.red.length = 5;
1396                 info->var.green.length = 5;
1397                 info->var.blue.length = 5;
1398                 info->var.transp.offset = 15;
1399                 info->var.transp.length = 1;
1400                 break;
1401         case 16:
1402                 info->var.red.offset = 11;
1403                 info->var.green.offset = 5;
1404                 info->var.blue.offset = 0;
1405                 info->var.red.length = 5;
1406                 info->var.green.length = 6;
1407                 info->var.blue.length = 5;
1408                 info->var.transp.offset = 0;
1409                 break;
1410         case 24:
1411                 info->var.red.offset = 16;
1412                 info->var.green.offset = 8;
1413                 info->var.blue.offset = 0;
1414                 info->var.red.length = 8;
1415                 info->var.green.length = 8;
1416                 info->var.blue.length = 8;
1417                 info->var.transp.offset = 0;
1418                 info->var.transp.length = 0;
1419                 break;
1420         case 32:
1421                 info->var.red.offset = 16;
1422                 info->var.green.offset = 8;
1423                 info->var.blue.offset = 0;
1424                 info->var.red.length = 8;
1425                 info->var.green.length = 8;
1426                 info->var.blue.length = 8;
1427                 info->var.transp.offset = 24;
1428                 info->var.transp.length = 8;
1429                 break;
1430         default:
1431                 break;
1432         }
1433
1434         info->var.xres = fb_width;
1435         info->var.yres = fb_height;
1436 }
1437 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1438
1439 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1440                                                uint32_t maxX,
1441                                                uint32_t maxY)
1442 {
1443         struct drm_connector *connector;
1444         int count = 0;
1445         int i;
1446
1447         for (i = 0; i < fb_helper->connector_count; i++) {
1448                 connector = fb_helper->connector_info[i]->connector;
1449                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1450         }
1451
1452         return count;
1453 }
1454
1455 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1456 {
1457         struct drm_display_mode *mode;
1458
1459         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1460                 if (mode->hdisplay > width ||
1461                     mode->vdisplay > height)
1462                         continue;
1463                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1464                         return mode;
1465         }
1466         return NULL;
1467 }
1468 EXPORT_SYMBOL(drm_has_preferred_mode);
1469
1470 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1471 {
1472         return fb_connector->connector->cmdline_mode.specified;
1473 }
1474
1475 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1476                                                       int width, int height)
1477 {
1478         struct drm_cmdline_mode *cmdline_mode;
1479         struct drm_display_mode *mode;
1480         bool prefer_non_interlace;
1481
1482         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1483         if (cmdline_mode->specified == false)
1484                 return NULL;
1485
1486         /* attempt to find a matching mode in the list of modes
1487          *  we have gotten so far, if not add a CVT mode that conforms
1488          */
1489         if (cmdline_mode->rb || cmdline_mode->margins)
1490                 goto create_mode;
1491
1492         prefer_non_interlace = !cmdline_mode->interlace;
1493 again:
1494         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1495                 /* check width/height */
1496                 if (mode->hdisplay != cmdline_mode->xres ||
1497                     mode->vdisplay != cmdline_mode->yres)
1498                         continue;
1499
1500                 if (cmdline_mode->refresh_specified) {
1501                         if (mode->vrefresh != cmdline_mode->refresh)
1502                                 continue;
1503                 }
1504
1505                 if (cmdline_mode->interlace) {
1506                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1507                                 continue;
1508                 } else if (prefer_non_interlace) {
1509                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1510                                 continue;
1511                 }
1512                 return mode;
1513         }
1514
1515         if (prefer_non_interlace) {
1516                 prefer_non_interlace = false;
1517                 goto again;
1518         }
1519
1520 create_mode:
1521         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1522                                                  cmdline_mode);
1523         list_add(&mode->head, &fb_helper_conn->connector->modes);
1524         return mode;
1525 }
1526 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1527
1528 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1529 {
1530         bool enable;
1531
1532         if (strict)
1533                 enable = connector->status == connector_status_connected;
1534         else
1535                 enable = connector->status != connector_status_disconnected;
1536
1537         return enable;
1538 }
1539
1540 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1541                                   bool *enabled)
1542 {
1543         bool any_enabled = false;
1544         struct drm_connector *connector;
1545         int i = 0;
1546
1547         for (i = 0; i < fb_helper->connector_count; i++) {
1548                 connector = fb_helper->connector_info[i]->connector;
1549                 enabled[i] = drm_connector_enabled(connector, true);
1550                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1551                           enabled[i] ? "yes" : "no");
1552                 any_enabled |= enabled[i];
1553         }
1554
1555         if (any_enabled)
1556                 return;
1557
1558         for (i = 0; i < fb_helper->connector_count; i++) {
1559                 connector = fb_helper->connector_info[i]->connector;
1560                 enabled[i] = drm_connector_enabled(connector, false);
1561         }
1562 }
1563
1564 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1565                               struct drm_display_mode **modes,
1566                               struct drm_fb_offset *offsets,
1567                               bool *enabled, int width, int height)
1568 {
1569         int count, i, j;
1570         bool can_clone = false;
1571         struct drm_fb_helper_connector *fb_helper_conn;
1572         struct drm_display_mode *dmt_mode, *mode;
1573
1574         /* only contemplate cloning in the single crtc case */
1575         if (fb_helper->crtc_count > 1)
1576                 return false;
1577
1578         count = 0;
1579         for (i = 0; i < fb_helper->connector_count; i++) {
1580                 if (enabled[i])
1581                         count++;
1582         }
1583
1584         /* only contemplate cloning if more than one connector is enabled */
1585         if (count <= 1)
1586                 return false;
1587
1588         /* check the command line or if nothing common pick 1024x768 */
1589         can_clone = true;
1590         for (i = 0; i < fb_helper->connector_count; i++) {
1591                 if (!enabled[i])
1592                         continue;
1593                 fb_helper_conn = fb_helper->connector_info[i];
1594                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1595                 if (!modes[i]) {
1596                         can_clone = false;
1597                         break;
1598                 }
1599                 for (j = 0; j < i; j++) {
1600                         if (!enabled[j])
1601                                 continue;
1602                         if (!drm_mode_equal(modes[j], modes[i]))
1603                                 can_clone = false;
1604                 }
1605         }
1606
1607         if (can_clone) {
1608                 DRM_DEBUG_KMS("can clone using command line\n");
1609                 return true;
1610         }
1611
1612         /* try and find a 1024x768 mode on each connector */
1613         can_clone = true;
1614         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1615
1616         for (i = 0; i < fb_helper->connector_count; i++) {
1617
1618                 if (!enabled[i])
1619                         continue;
1620
1621                 fb_helper_conn = fb_helper->connector_info[i];
1622                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1623                         if (drm_mode_equal(mode, dmt_mode))
1624                                 modes[i] = mode;
1625                 }
1626                 if (!modes[i])
1627                         can_clone = false;
1628         }
1629
1630         if (can_clone) {
1631                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1632                 return true;
1633         }
1634         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1635         return false;
1636 }
1637
1638 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1639                                 struct drm_display_mode **modes,
1640                                 struct drm_fb_offset *offsets,
1641                                 int idx,
1642                                 int h_idx, int v_idx)
1643 {
1644         struct drm_fb_helper_connector *fb_helper_conn;
1645         int i;
1646         int hoffset = 0, voffset = 0;
1647
1648         for (i = 0; i < fb_helper->connector_count; i++) {
1649                 fb_helper_conn = fb_helper->connector_info[i];
1650                 if (!fb_helper_conn->connector->has_tile)
1651                         continue;
1652
1653                 if (!modes[i] && (h_idx || v_idx)) {
1654                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1655                                       fb_helper_conn->connector->base.id);
1656                         continue;
1657                 }
1658                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1659                         hoffset += modes[i]->hdisplay;
1660
1661                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1662                         voffset += modes[i]->vdisplay;
1663         }
1664         offsets[idx].x = hoffset;
1665         offsets[idx].y = voffset;
1666         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1667         return 0;
1668 }
1669
1670 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1671                                  struct drm_display_mode **modes,
1672                                  struct drm_fb_offset *offsets,
1673                                  bool *enabled, int width, int height)
1674 {
1675         struct drm_fb_helper_connector *fb_helper_conn;
1676         int i;
1677         uint64_t conn_configured = 0, mask;
1678         int tile_pass = 0;
1679         mask = (1 << fb_helper->connector_count) - 1;
1680 retry:
1681         for (i = 0; i < fb_helper->connector_count; i++) {
1682                 fb_helper_conn = fb_helper->connector_info[i];
1683
1684                 if (conn_configured & (1 << i))
1685                         continue;
1686
1687                 if (enabled[i] == false) {
1688                         conn_configured |= (1 << i);
1689                         continue;
1690                 }
1691
1692                 /* first pass over all the untiled connectors */
1693                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1694                         continue;
1695
1696                 if (tile_pass == 1) {
1697                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1698                             fb_helper_conn->connector->tile_v_loc != 0)
1699                                 continue;
1700
1701                 } else {
1702                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1703                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1704                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1705                                 continue;
1706
1707                         /* find the tile offsets for this pass - need
1708                            to find all tiles left and above */
1709                         drm_get_tile_offsets(fb_helper, modes, offsets,
1710                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1711                 }
1712                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1713                               fb_helper_conn->connector->base.id);
1714
1715                 /* got for command line mode first */
1716                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1717                 if (!modes[i]) {
1718                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1719                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1720                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1721                 }
1722                 /* No preferred modes, pick one off the list */
1723                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1724                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1725                                 break;
1726                 }
1727                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1728                           "none");
1729                 conn_configured |= (1 << i);
1730         }
1731
1732         if ((conn_configured & mask) != mask) {
1733                 tile_pass++;
1734                 goto retry;
1735         }
1736         return true;
1737 }
1738
1739 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1740                           struct drm_fb_helper_crtc **best_crtcs,
1741                           struct drm_display_mode **modes,
1742                           int n, int width, int height)
1743 {
1744         int c, o;
1745         struct drm_device *dev = fb_helper->dev;
1746         struct drm_connector *connector;
1747         const struct drm_connector_helper_funcs *connector_funcs;
1748         struct drm_encoder *encoder;
1749         int my_score, best_score, score;
1750         struct drm_fb_helper_crtc **crtcs, *crtc;
1751         struct drm_fb_helper_connector *fb_helper_conn;
1752
1753         if (n == fb_helper->connector_count)
1754                 return 0;
1755
1756         fb_helper_conn = fb_helper->connector_info[n];
1757         connector = fb_helper_conn->connector;
1758
1759         best_crtcs[n] = NULL;
1760         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1761         if (modes[n] == NULL)
1762                 return best_score;
1763
1764         crtcs = kzalloc(dev->mode_config.num_connector *
1765                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1766         if (!crtcs)
1767                 return best_score;
1768
1769         my_score = 1;
1770         if (connector->status == connector_status_connected)
1771                 my_score++;
1772         if (drm_has_cmdline_mode(fb_helper_conn))
1773                 my_score++;
1774         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1775                 my_score++;
1776
1777         connector_funcs = connector->helper_private;
1778         encoder = connector_funcs->best_encoder(connector);
1779         if (!encoder)
1780                 goto out;
1781
1782         /* select a crtc for this connector and then attempt to configure
1783            remaining connectors */
1784         for (c = 0; c < fb_helper->crtc_count; c++) {
1785                 crtc = &fb_helper->crtc_info[c];
1786
1787                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1788                         continue;
1789
1790                 for (o = 0; o < n; o++)
1791                         if (best_crtcs[o] == crtc)
1792                                 break;
1793
1794                 if (o < n) {
1795                         /* ignore cloning unless only a single crtc */
1796                         if (fb_helper->crtc_count > 1)
1797                                 continue;
1798
1799                         if (!drm_mode_equal(modes[o], modes[n]))
1800                                 continue;
1801                 }
1802
1803                 crtcs[n] = crtc;
1804                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1805                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1806                                                   width, height);
1807                 if (score > best_score) {
1808                         best_score = score;
1809                         memcpy(best_crtcs, crtcs,
1810                                dev->mode_config.num_connector *
1811                                sizeof(struct drm_fb_helper_crtc *));
1812                 }
1813         }
1814 out:
1815         kfree(crtcs);
1816         return best_score;
1817 }
1818
1819 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1820 {
1821         struct drm_device *dev = fb_helper->dev;
1822         struct drm_fb_helper_crtc **crtcs;
1823         struct drm_display_mode **modes;
1824         struct drm_fb_offset *offsets;
1825         struct drm_mode_set *modeset;
1826         bool *enabled;
1827         int width, height;
1828         int i;
1829
1830         DRM_DEBUG_KMS("\n");
1831
1832         width = dev->mode_config.max_width;
1833         height = dev->mode_config.max_height;
1834
1835         crtcs = kcalloc(dev->mode_config.num_connector,
1836                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1837         modes = kcalloc(dev->mode_config.num_connector,
1838                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1839         offsets = kcalloc(dev->mode_config.num_connector,
1840                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1841         enabled = kcalloc(dev->mode_config.num_connector,
1842                           sizeof(bool), GFP_KERNEL);
1843         if (!crtcs || !modes || !enabled || !offsets) {
1844                 DRM_ERROR("Memory allocation failed\n");
1845                 goto out;
1846         }
1847
1848
1849         drm_enable_connectors(fb_helper, enabled);
1850
1851         if (!(fb_helper->funcs->initial_config &&
1852               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1853                                                offsets,
1854                                                enabled, width, height))) {
1855                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1856                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1857                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1858
1859                 if (!drm_target_cloned(fb_helper, modes, offsets,
1860                                        enabled, width, height) &&
1861                     !drm_target_preferred(fb_helper, modes, offsets,
1862                                           enabled, width, height))
1863                         DRM_ERROR("Unable to find initial modes\n");
1864
1865                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1866                               width, height);
1867
1868                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1869         }
1870
1871         /* need to set the modesets up here for use later */
1872         /* fill out the connector<->crtc mappings into the modesets */
1873         for (i = 0; i < fb_helper->crtc_count; i++) {
1874                 modeset = &fb_helper->crtc_info[i].mode_set;
1875                 modeset->num_connectors = 0;
1876                 modeset->fb = NULL;
1877         }
1878
1879         for (i = 0; i < fb_helper->connector_count; i++) {
1880                 struct drm_display_mode *mode = modes[i];
1881                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1882                 struct drm_fb_offset *offset = &offsets[i];
1883                 modeset = &fb_crtc->mode_set;
1884
1885                 if (mode && fb_crtc) {
1886                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1887                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1888                         fb_crtc->desired_mode = mode;
1889                         fb_crtc->x = offset->x;
1890                         fb_crtc->y = offset->y;
1891                         if (modeset->mode)
1892                                 drm_mode_destroy(dev, modeset->mode);
1893                         modeset->mode = drm_mode_duplicate(dev,
1894                                                            fb_crtc->desired_mode);
1895                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1896                         modeset->fb = fb_helper->fb;
1897                         modeset->x = offset->x;
1898                         modeset->y = offset->y;
1899                 }
1900         }
1901
1902         /* Clear out any old modes if there are no more connected outputs. */
1903         for (i = 0; i < fb_helper->crtc_count; i++) {
1904                 modeset = &fb_helper->crtc_info[i].mode_set;
1905                 if (modeset->num_connectors == 0) {
1906                         BUG_ON(modeset->fb);
1907                         if (modeset->mode)
1908                                 drm_mode_destroy(dev, modeset->mode);
1909                         modeset->mode = NULL;
1910                 }
1911         }
1912 out:
1913         kfree(crtcs);
1914         kfree(modes);
1915         kfree(offsets);
1916         kfree(enabled);
1917 }
1918
1919 /**
1920  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1921  * @fb_helper: fb_helper device struct
1922  * @bpp_sel: bpp value to use for the framebuffer configuration
1923  *
1924  * Scans the CRTCs and connectors and tries to put together an initial setup.
1925  * At the moment, this is a cloned configuration across all heads with
1926  * a new framebuffer object as the backing store.
1927  *
1928  * Note that this also registers the fbdev and so allows userspace to call into
1929  * the driver through the fbdev interfaces.
1930  *
1931  * This function will call down into the ->fb_probe callback to let
1932  * the driver allocate and initialize the fbdev info structure and the drm
1933  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1934  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1935  * values for the fbdev info structure.
1936  *
1937  * RETURNS:
1938  * Zero if everything went ok, nonzero otherwise.
1939  */
1940 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1941 {
1942         struct drm_device *dev = fb_helper->dev;
1943         int count = 0;
1944
1945         mutex_lock(&dev->mode_config.mutex);
1946         count = drm_fb_helper_probe_connector_modes(fb_helper,
1947                                                     dev->mode_config.max_width,
1948                                                     dev->mode_config.max_height);
1949         mutex_unlock(&dev->mode_config.mutex);
1950         /*
1951          * we shouldn't end up with no modes here.
1952          */
1953         if (count == 0)
1954                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1955
1956         drm_setup_crtcs(fb_helper);
1957
1958         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1959 }
1960 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1961
1962 /**
1963  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1964  *                               probing all the outputs attached to the fb
1965  * @fb_helper: the drm_fb_helper
1966  *
1967  * Scan the connectors attached to the fb_helper and try to put together a
1968  * setup after *notification of a change in output configuration.
1969  *
1970  * Called at runtime, takes the mode config locks to be able to check/change the
1971  * modeset configuration. Must be run from process context (which usually means
1972  * either the output polling work or a work item launched from the driver's
1973  * hotplug interrupt).
1974  *
1975  * Note that drivers may call this even before calling
1976  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1977  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1978  * not miss any hotplug events.
1979  *
1980  * RETURNS:
1981  * 0 on success and a non-zero error code otherwise.
1982  */
1983 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1984 {
1985         struct drm_device *dev = fb_helper->dev;
1986         u32 max_width, max_height;
1987
1988         mutex_lock(&fb_helper->dev->mode_config.mutex);
1989         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1990                 fb_helper->delayed_hotplug = true;
1991                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1992                 return 0;
1993         }
1994         DRM_DEBUG_KMS("\n");
1995
1996         max_width = fb_helper->fb->width;
1997         max_height = fb_helper->fb->height;
1998
1999         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2000         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2001
2002         drm_modeset_lock_all(dev);
2003         drm_setup_crtcs(fb_helper);
2004         drm_modeset_unlock_all(dev);
2005         drm_fb_helper_set_par(fb_helper->fbdev);
2006
2007         return 0;
2008 }
2009 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2010
2011 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2012  * but the module doesn't depend on any fb console symbols.  At least
2013  * attempt to load fbcon to avoid leaving the system without a usable console.
2014  */
2015 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2016 static int __init drm_fb_helper_modinit(void)
2017 {
2018         const char *name = "fbcon";
2019         struct module *fbcon;
2020
2021         mutex_lock(&module_mutex);
2022         fbcon = find_module(name);
2023         mutex_unlock(&module_mutex);
2024
2025         if (!fbcon)
2026                 request_module_nowait(name);
2027         return 0;
2028 }
2029
2030 module_init(drm_fb_helper_modinit);
2031 #endif