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_unlocked() from their ->lastclose callback.
  60  * They 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         /*
 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                 drm_mode_destroy(connector->dev, set->mode);
 177                 set->mode = NULL;
 178         }
 179 }
 180
 181 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 182                                        struct drm_connector *connector)
 183 {
 184         struct drm_fb_helper_connector *fb_helper_connector;
 185         int i, j;
 186
 187         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 188
 189         for (i = 0; i < fb_helper->connector_count; i++) {
 190                 if (fb_helper->connector_info[i]->connector == connector)
 191                         break;
 192         }
 193
 194         if (i == fb_helper->connector_count)
 195                 return -EINVAL;
 196         fb_helper_connector = fb_helper->connector_info[i];
 197
 198         for (j = i + 1; j < fb_helper->connector_count; j++) {
 199                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 200         }
 201         fb_helper->connector_count--;
 202         kfree(fb_helper_connector);
 203
 204         /* also cleanup dangling references to the connector: */
 205         for (i = 0; i < fb_helper->crtc_count; i++)
 206                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 207
 208         return 0;
 209 }
 210 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 211
 212 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 213 {
 214         uint16_t *r_base, *g_base, *b_base;
 215         int i;
 216
 217         if (helper->funcs->gamma_get == NULL)
 218                 return;
 219
 220         r_base = crtc->gamma_store;
 221         g_base = r_base + crtc->gamma_size;
 222         b_base = g_base + crtc->gamma_size;
 223
 224         for (i = 0; i < crtc->gamma_size; i++)
 225                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 226 }
 227
 228 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 229 {
 230         uint16_t *r_base, *g_base, *b_base;
 231
 232         if (crtc->funcs->gamma_set == NULL)
 233                 return;
 234
 235         r_base = crtc->gamma_store;
 236         g_base = r_base + crtc->gamma_size;
 237         b_base = g_base + crtc->gamma_size;
 238
 239         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 240 }
 241
 242 /**
 243  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 244  * @info: fbdev registered by the helper
 245  */
 246 int drm_fb_helper_debug_enter(struct fb_info *info)
 247 {
 248         struct drm_fb_helper *helper = info->par;
 249         const struct drm_crtc_helper_funcs *funcs;
 250         int i;
 251
 252         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 253                 for (i = 0; i < helper->crtc_count; i++) {
 254                         struct drm_mode_set *mode_set =
 255                                 &helper->crtc_info[i].mode_set;
 256
 257                         if (!mode_set->crtc->enabled)
 258                                 continue;
 259
 260                         funcs = mode_set->crtc->helper_private;
 261                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 262                         funcs->mode_set_base_atomic(mode_set->crtc,
 263                                                     mode_set->fb,
 264                                                     mode_set->x,
 265                                                     mode_set->y,
 266                                                     ENTER_ATOMIC_MODE_SET);
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 273
 274 /* Find the real fb for a given fb helper CRTC */
 275 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 276 {
 277         struct drm_device *dev = crtc->dev;
 278         struct drm_crtc *c;
 279
 280         drm_for_each_crtc(c, dev) {
 281                 if (crtc->base.id == c->base.id)
 282                         return c->primary->fb;
 283         }
 284
 285         return NULL;
 286 }
 287
 288 /**
 289  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 290  * @info: fbdev registered by the helper
 291  */
 292 int drm_fb_helper_debug_leave(struct fb_info *info)
 293 {
 294         struct drm_fb_helper *helper = info->par;
 295         struct drm_crtc *crtc;
 296         const struct drm_crtc_helper_funcs *funcs;
 297         struct drm_framebuffer *fb;
 298         int i;
 299
 300         for (i = 0; i < helper->crtc_count; i++) {
 301                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 302                 crtc = mode_set->crtc;
 303                 funcs = crtc->helper_private;
 304                 fb = drm_mode_config_fb(crtc);
 305
 306                 if (!crtc->enabled)
 307                         continue;
 308
 309                 if (!fb) {
 310                         DRM_ERROR("no fb to restore??\n");
 311                         continue;
 312                 }
 313
 314                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 315                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 316                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 317         }
 318
 319         return 0;
 320 }
 321 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 322
 323 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 324 {
 325         struct drm_device *dev = fb_helper->dev;
 326         struct drm_plane *plane;
 327         bool error = false;
 328         int i;
 329
 330         drm_warn_on_modeset_not_all_locked(dev);
 331
 332         drm_for_each_plane(plane, dev) {
 333                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 334                         drm_plane_force_disable(plane);
 335
 336                 if (dev->mode_config.rotation_property) {
 337                         drm_mode_plane_set_obj_prop(plane,
 338                                                     dev->mode_config.rotation_property,
 339                                                     BIT(DRM_ROTATE_0));
 340                 }
 341         }
 342
 343         for (i = 0; i < fb_helper->crtc_count; i++) {
 344                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 345                 struct drm_crtc *crtc = mode_set->crtc;
 346                 int ret;
 347
 348                 if (crtc->funcs->cursor_set2) {
 349                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
 350                         if (ret)
 351                                 error = true;
 352                 } else if (crtc->funcs->cursor_set) {
 353                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 354                         if (ret)
 355                                 error = true;
 356                 }
 357
 358                 ret = drm_mode_set_config_internal(mode_set);
 359                 if (ret)
 360                         error = true;
 361         }
 362         return error;
 363 }
 364
 365 /**
 366  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 367  * @fb_helper: fbcon to restore
 368  *
 369  * This should be called from driver's drm ->lastclose callback
 370  * when implementing an fbcon on top of kms using this helper. This ensures that
 371  * the user isn't greeted with a black screen when e.g. X dies.
 372  */
 373 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 374 {
 375         struct drm_device *dev = fb_helper->dev;
 376         bool ret;
 377         bool do_delayed = false;
 378
 379         drm_modeset_lock_all(dev);
 380         ret = restore_fbdev_mode(fb_helper);
 381
 382         do_delayed = fb_helper->delayed_hotplug;
 383         if (do_delayed)
 384                 fb_helper->delayed_hotplug = false;
 385         drm_modeset_unlock_all(dev);
 386
 387         if (do_delayed)
 388                 drm_fb_helper_hotplug_event(fb_helper);
 389         return ret;
 390 }
 391 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 392
 393 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 394 {
 395         struct drm_device *dev = fb_helper->dev;
 396         struct drm_crtc *crtc;
 397         int bound = 0, crtcs_bound = 0;
 398
 399         /* Sometimes user space wants everything disabled, so don't steal the
 400          * display if there's a master. */
 401         if (dev->primary->master)
 402                 return false;
 403
 404         drm_for_each_crtc(crtc, dev) {
 405                 if (crtc->primary->fb)
 406                         crtcs_bound++;
 407                 if (crtc->primary->fb == fb_helper->fb)
 408                         bound++;
 409         }
 410
 411         if (bound < crtcs_bound)
 412                 return false;
 413
 414         return true;
 415 }
 416
 417 #ifdef CONFIG_MAGIC_SYSRQ
 418 /*
 419  * restore fbcon display for all kms driver's using this helper, used for sysrq
 420  * and panic handling.
 421  */
 422 static bool drm_fb_helper_force_kernel_mode(void)
 423 {
 424         bool ret, error = false;
 425         struct drm_fb_helper *helper;
 426
 427         if (list_empty(&kernel_fb_helper_list))
 428                 return false;
 429
 430         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 431                 struct drm_device *dev = helper->dev;
 432
 433                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 434                         continue;
 435
 436                 drm_modeset_lock_all(dev);
 437                 ret = restore_fbdev_mode(helper);
 438                 if (ret)
 439                         error = true;
 440                 drm_modeset_unlock_all(dev);
 441         }
 442         return error;
 443 }
 444
 445 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 446 {
 447         bool ret;
 448         ret = drm_fb_helper_force_kernel_mode();
 449         if (ret == true)
 450                 DRM_ERROR("Failed to restore crtc configuration\n");
 451 }
 452 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 453
 454 static void drm_fb_helper_sysrq(int dummy1)
 455 {
 456         schedule_work(&drm_fb_helper_restore_work);
 457 }
 458
 459 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 460         .handler = drm_fb_helper_sysrq,
 461         .help_msg = "force-fb(V)",
 462         .action_msg = "Restore framebuffer console",
 463 };
 464 #else
 465 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 466 #endif
 467
 468 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 469 {
 470         struct drm_fb_helper *fb_helper = info->par;
 471         struct drm_device *dev = fb_helper->dev;
 472         struct drm_crtc *crtc;
 473         struct drm_connector *connector;
 474         int i, j;
 475
 476         /*
 477          * For each CRTC in this fb, turn the connectors on/off.
 478          */
 479         drm_modeset_lock_all(dev);
 480         if (!drm_fb_helper_is_bound(fb_helper)) {
 481                 drm_modeset_unlock_all(dev);
 482                 return;
 483         }
 484
 485         for (i = 0; i < fb_helper->crtc_count; i++) {
 486                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 487
 488                 if (!crtc->enabled)
 489                         continue;
 490
 491                 /* Walk the connectors & encoders on this fb turning them on/off */
 492                 for (j = 0; j < fb_helper->connector_count; j++) {
 493                         connector = fb_helper->connector_info[j]->connector;
 494                         connector->funcs->dpms(connector, dpms_mode);
 495                         drm_object_property_set_value(&connector->base,
 496                                 dev->mode_config.dpms_property, dpms_mode);
 497                 }
 498         }
 499         drm_modeset_unlock_all(dev);
 500 }
 501
 502 /**
 503  * drm_fb_helper_blank - implementation for ->fb_blank
 504  * @blank: desired blanking state
 505  * @info: fbdev registered by the helper
 506  */
 507 int drm_fb_helper_blank(int blank, struct fb_info *info)
 508 {
 509         if (oops_in_progress)
 510                 return -EBUSY;
 511
 512         switch (blank) {
 513         /* Display: On; HSync: On, VSync: On */
 514         case FB_BLANK_UNBLANK:
 515                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 516                 break;
 517         /* Display: Off; HSync: On, VSync: On */
 518         case FB_BLANK_NORMAL:
 519                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 520                 break;
 521         /* Display: Off; HSync: Off, VSync: On */
 522         case FB_BLANK_HSYNC_SUSPEND:
 523                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 524                 break;
 525         /* Display: Off; HSync: On, VSync: Off */
 526         case FB_BLANK_VSYNC_SUSPEND:
 527                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 528                 break;
 529         /* Display: Off; HSync: Off, VSync: Off */
 530         case FB_BLANK_POWERDOWN:
 531                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 532                 break;
 533         }
 534         return 0;
 535 }
 536 EXPORT_SYMBOL(drm_fb_helper_blank);
 537
 538 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 539 {
 540         int i;
 541
 542         for (i = 0; i < helper->connector_count; i++)
 543                 kfree(helper->connector_info[i]);
 544         kfree(helper->connector_info);
 545         for (i = 0; i < helper->crtc_count; i++) {
 546                 kfree(helper->crtc_info[i].mode_set.connectors);
 547                 if (helper->crtc_info[i].mode_set.mode)
 548                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 549         }
 550         kfree(helper->crtc_info);
 551 }
 552
 553 /**
 554  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 555  * @dev: DRM device
 556  * @helper: driver-allocated fbdev helper structure to set up
 557  * @funcs: pointer to structure of functions associate with this helper
 558  *
 559  * Sets up the bare minimum to make the framebuffer helper usable. This is
 560  * useful to implement race-free initialization of the polling helpers.
 561  */
 562 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 563                            const struct drm_fb_helper_funcs *funcs)
 564 {
 565         INIT_LIST_HEAD(&helper->kernel_fb_list);
 566         helper->funcs = funcs;
 567         helper->dev = dev;
 568 }
 569 EXPORT_SYMBOL(drm_fb_helper_prepare);
 570
 571 /**
 572  * drm_fb_helper_init - initialize a drm_fb_helper structure
 573  * @dev: drm device
 574  * @fb_helper: driver-allocated fbdev helper structure to initialize
 575  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 576  * @max_conn_count: max connector count
 577  *
 578  * This allocates the structures for the fbdev helper with the given limits.
 579  * Note that this won't yet touch the hardware (through the driver interfaces)
 580  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 581  * to allow driver writes more control over the exact init sequence.
 582  *
 583  * Drivers must call drm_fb_helper_prepare() before calling this function.
 584  *
 585  * RETURNS:
 586  * Zero if everything went ok, nonzero otherwise.
 587  */
 588 int drm_fb_helper_init(struct drm_device *dev,
 589                        struct drm_fb_helper *fb_helper,
 590                        int crtc_count, int max_conn_count)
 591 {
 592         struct drm_crtc *crtc;
 593         int i;
 594
 595         if (!max_conn_count)
 596                 return -EINVAL;
 597
 598         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 599         if (!fb_helper->crtc_info)
 600                 return -ENOMEM;
 601
 602         fb_helper->crtc_count = crtc_count;
 603         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 604         if (!fb_helper->connector_info) {
 605                 kfree(fb_helper->crtc_info);
 606                 return -ENOMEM;
 607         }
 608         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 609         fb_helper->connector_count = 0;
 610
 611         for (i = 0; i < crtc_count; i++) {
 612                 fb_helper->crtc_info[i].mode_set.connectors =
 613                         kcalloc(max_conn_count,
 614                                 sizeof(struct drm_connector *),
 615                                 GFP_KERNEL);
 616
 617                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 618                         goto out_free;
 619                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 620         }
 621
 622         i = 0;
 623         drm_for_each_crtc(crtc, dev) {
 624                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 625                 i++;
 626         }
 627
 628         return 0;
 629 out_free:
 630         drm_fb_helper_crtc_free(fb_helper);
 631         return -ENOMEM;
 632 }
 633 EXPORT_SYMBOL(drm_fb_helper_init);
 634
 635 /**
 636  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 637  * @fb_helper: driver-allocated fbdev helper
 638  *
 639  * A helper to alloc fb_info and the members cmap and apertures. Called
 640  * by the driver within the fb_probe fb_helper callback function.
 641  *
 642  * RETURNS:
 643  * fb_info pointer if things went okay, pointer containing error code
 644  * otherwise
 645  */
 646 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 647 {
 648         struct device *dev = fb_helper->dev->dev;
 649         struct fb_info *info;
 650         int ret;
 651
 652         info = framebuffer_alloc(0, dev);
 653         if (!info)
 654                 return ERR_PTR(-ENOMEM);
 655
 656         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 657         if (ret)
 658                 goto err_release;
 659
 660         info->apertures = alloc_apertures(1);
 661         if (!info->apertures) {
 662                 ret = -ENOMEM;
 663                 goto err_free_cmap;
 664         }
 665
 666         fb_helper->fbdev = info;
 667
 668         return info;
 669
 670 err_free_cmap:
 671         fb_dealloc_cmap(&info->cmap);
 672 err_release:
 673         framebuffer_release(info);
 674         return ERR_PTR(ret);
 675 }
 676 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 677
 678 /**
 679  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 680  * @fb_helper: driver-allocated fbdev helper
 681  *
 682  * A wrapper around unregister_framebuffer, to release the fb_info
 683  * framebuffer device
 684  */
 685 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 686 {
 687         if (fb_helper && fb_helper->fbdev)
 688                 unregister_framebuffer(fb_helper->fbdev);
 689 }
 690 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 691
 692 /**
 693  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 694  * @fb_helper: driver-allocated fbdev helper
 695  *
 696  * A helper to free memory taken by fb_info and the members cmap and
 697  * apertures
 698  */
 699 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 700 {
 701         if (fb_helper) {
 702                 struct fb_info *info = fb_helper->fbdev;
 703
 704                 if (info) {
 705                         if (info->cmap.len)
 706                                 fb_dealloc_cmap(&info->cmap);
 707                         framebuffer_release(info);
 708                 }
 709
 710                 fb_helper->fbdev = NULL;
 711         }
 712 }
 713 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 714
 715 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 716 {
 717         if (!list_empty(&fb_helper->kernel_fb_list)) {
 718                 list_del(&fb_helper->kernel_fb_list);
 719                 if (list_empty(&kernel_fb_helper_list)) {
 720                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 721                 }
 722         }
 723
 724         drm_fb_helper_crtc_free(fb_helper);
 725
 726 }
 727 EXPORT_SYMBOL(drm_fb_helper_fini);
 728
 729 /**
 730  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 731  * @fb_helper: driver-allocated fbdev helper
 732  *
 733  * A wrapper around unlink_framebuffer implemented by fbdev core
 734  */
 735 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 736 {
 737         if (fb_helper && fb_helper->fbdev)
 738                 unlink_framebuffer(fb_helper->fbdev);
 739 }
 740 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 741
 742 /**
 743  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 744  * @info: fb_info struct pointer
 745  * @buf: userspace buffer to read from framebuffer memory
 746  * @count: number of bytes to read from framebuffer memory
 747  * @ppos: read offset within framebuffer memory
 748  *
 749  * A wrapper around fb_sys_read implemented by fbdev core
 750  */
 751 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 752                                size_t count, loff_t *ppos)
 753 {
 754         return fb_sys_read(info, buf, count, ppos);
 755 }
 756 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 757
 758 /**
 759  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 760  * @info: fb_info struct pointer
 761  * @buf: userspace buffer to write to framebuffer memory
 762  * @count: number of bytes to write to framebuffer memory
 763  * @ppos: write offset within framebuffer memory
 764  *
 765  * A wrapper around fb_sys_write implemented by fbdev core
 766  */
 767 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 768                                 size_t count, loff_t *ppos)
 769 {
 770         return fb_sys_write(info, buf, count, ppos);
 771 }
 772 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 773
 774 /**
 775  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 776  * @info: fbdev registered by the helper
 777  * @rect: info about rectangle to fill
 778  *
 779  * A wrapper around sys_fillrect implemented by fbdev core
 780  */
 781 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 782                                 const struct fb_fillrect *rect)
 783 {
 784         sys_fillrect(info, rect);
 785 }
 786 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 787
 788 /**
 789  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 790  * @info: fbdev registered by the helper
 791  * @area: info about area to copy
 792  *
 793  * A wrapper around sys_copyarea implemented by fbdev core
 794  */
 795 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 796                                 const struct fb_copyarea *area)
 797 {
 798         sys_copyarea(info, area);
 799 }
 800 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 801
 802 /**
 803  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 804  * @info: fbdev registered by the helper
 805  * @image: info about image to blit
 806  *
 807  * A wrapper around sys_imageblit implemented by fbdev core
 808  */
 809 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 810                                  const struct fb_image *image)
 811 {
 812         sys_imageblit(info, image);
 813 }
 814 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 815
 816 /**
 817  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 818  * @info: fbdev registered by the helper
 819  * @rect: info about rectangle to fill
 820  *
 821  * A wrapper around cfb_imageblit implemented by fbdev core
 822  */
 823 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 824                                 const struct fb_fillrect *rect)
 825 {
 826         cfb_fillrect(info, rect);
 827 }
 828 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 829
 830 /**
 831  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 832  * @info: fbdev registered by the helper
 833  * @area: info about area to copy
 834  *
 835  * A wrapper around cfb_copyarea implemented by fbdev core
 836  */
 837 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 838                                 const struct fb_copyarea *area)
 839 {
 840         cfb_copyarea(info, area);
 841 }
 842 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 843
 844 /**
 845  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 846  * @info: fbdev registered by the helper
 847  * @image: info about image to blit
 848  *
 849  * A wrapper around cfb_imageblit implemented by fbdev core
 850  */
 851 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 852                                  const struct fb_image *image)
 853 {
 854         cfb_imageblit(info, image);
 855 }
 856 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 857
 858 /**
 859  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 860  * @fb_helper: driver-allocated fbdev helper
 861  * @state: desired state, zero to resume, non-zero to suspend
 862  *
 863  * A wrapper around fb_set_suspend implemented by fbdev core
 864  */
 865 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 866 {
 867         if (fb_helper && fb_helper->fbdev)
 868                 fb_set_suspend(fb_helper->fbdev, state);
 869 }
 870 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 871
 872 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 873                      u16 blue, u16 regno, struct fb_info *info)
 874 {
 875         struct drm_fb_helper *fb_helper = info->par;
 876         struct drm_framebuffer *fb = fb_helper->fb;
 877         int pindex;
 878
 879         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 880                 u32 *palette;
 881                 u32 value;
 882                 /* place color in psuedopalette */
 883                 if (regno > 16)
 884                         return -EINVAL;
 885                 palette = (u32 *)info->pseudo_palette;
 886                 red >>= (16 - info->var.red.length);
 887                 green >>= (16 - info->var.green.length);
 888                 blue >>= (16 - info->var.blue.length);
 889                 value = (red << info->var.red.offset) |
 890                         (green << info->var.green.offset) |
 891                         (blue << info->var.blue.offset);
 892                 if (info->var.transp.length > 0) {
 893                         u32 mask = (1 << info->var.transp.length) - 1;
 894                         mask <<= info->var.transp.offset;
 895                         value |= mask;
 896                 }
 897                 palette[regno] = value;
 898                 return 0;
 899         }
 900
 901         /*
 902          * The driver really shouldn't advertise pseudo/directcolor
 903          * visuals if it can't deal with the palette.
 904          */
 905         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 906                     !fb_helper->funcs->gamma_get))
 907                 return -EINVAL;
 908
 909         pindex = regno;
 910
 911         if (fb->bits_per_pixel == 16) {
 912                 pindex = regno << 3;
 913
 914                 if (fb->depth == 16 && regno > 63)
 915                         return -EINVAL;
 916                 if (fb->depth == 15 && regno > 31)
 917                         return -EINVAL;
 918
 919                 if (fb->depth == 16) {
 920                         u16 r, g, b;
 921                         int i;
 922                         if (regno < 32) {
 923                                 for (i = 0; i < 8; i++)
 924                                         fb_helper->funcs->gamma_set(crtc, red,
 925                                                 green, blue, pindex + i);
 926                         }
 927
 928                         fb_helper->funcs->gamma_get(crtc, &r,
 929                                                     &g, &b,
 930                                                     pindex >> 1);
 931
 932                         for (i = 0; i < 4; i++)
 933                                 fb_helper->funcs->gamma_set(crtc, r,
 934                                                             green, b,
 935                                                             (pindex >> 1) + i);
 936                 }
 937         }
 938
 939         if (fb->depth != 16)
 940                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 941         return 0;
 942 }
 943
 944 /**
 945  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 946  * @cmap: cmap to set
 947  * @info: fbdev registered by the helper
 948  */
 949 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 950 {
 951         struct drm_fb_helper *fb_helper = info->par;
 952         struct drm_device *dev = fb_helper->dev;
 953         const struct drm_crtc_helper_funcs *crtc_funcs;
 954         u16 *red, *green, *blue, *transp;
 955         struct drm_crtc *crtc;
 956         int i, j, rc = 0;
 957         int start;
 958
 959         if (oops_in_progress)
 960                 return -EBUSY;
 961
 962         drm_modeset_lock_all(dev);
 963         if (!drm_fb_helper_is_bound(fb_helper)) {
 964                 drm_modeset_unlock_all(dev);
 965                 return -EBUSY;
 966         }
 967
 968         for (i = 0; i < fb_helper->crtc_count; i++) {
 969                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 970                 crtc_funcs = crtc->helper_private;
 971
 972                 red = cmap->red;
 973                 green = cmap->green;
 974                 blue = cmap->blue;
 975                 transp = cmap->transp;
 976                 start = cmap->start;
 977
 978                 for (j = 0; j < cmap->len; j++) {
 979                         u16 hred, hgreen, hblue, htransp = 0xffff;
 980
 981                         hred = *red++;
 982                         hgreen = *green++;
 983                         hblue = *blue++;
 984
 985                         if (transp)
 986                                 htransp = *transp++;
 987
 988                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 989                         if (rc)
 990                                 goto out;
 991                 }
 992                 if (crtc_funcs->load_lut)
 993                         crtc_funcs->load_lut(crtc);
 994         }
 995  out:
 996         drm_modeset_unlock_all(dev);
 997         return rc;
 998 }
 999 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1000
1001 /**
1002  * drm_fb_helper_check_var - implementation for ->fb_check_var
1003  * @var: screeninfo to check
1004  * @info: fbdev registered by the helper
1005  */
1006 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1007                             struct fb_info *info)
1008 {
1009         struct drm_fb_helper *fb_helper = info->par;
1010         struct drm_framebuffer *fb = fb_helper->fb;
1011         int depth;
1012
1013         if (var->pixclock != 0 || in_dbg_master())
1014                 return -EINVAL;
1015
1016         /* Need to resize the fb object !!! */
1017         if (var->bits_per_pixel > fb->bits_per_pixel ||
1018             var->xres > fb->width || var->yres > fb->height ||
1019             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1020                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1021                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1022                           var->xres, var->yres, var->bits_per_pixel,
1023                           var->xres_virtual, var->yres_virtual,
1024                           fb->width, fb->height, fb->bits_per_pixel);
1025                 return -EINVAL;
1026         }
1027
1028         switch (var->bits_per_pixel) {
1029         case 16:
1030                 depth = (var->green.length == 6) ? 16 : 15;
1031                 break;
1032         case 32:
1033                 depth = (var->transp.length > 0) ? 32 : 24;
1034                 break;
1035         default:
1036                 depth = var->bits_per_pixel;
1037                 break;
1038         }
1039
1040         switch (depth) {
1041         case 8:
1042                 var->red.offset = 0;
1043                 var->green.offset = 0;
1044                 var->blue.offset = 0;
1045                 var->red.length = 8;
1046                 var->green.length = 8;
1047                 var->blue.length = 8;
1048                 var->transp.length = 0;
1049                 var->transp.offset = 0;
1050                 break;
1051         case 15:
1052                 var->red.offset = 10;
1053                 var->green.offset = 5;
1054                 var->blue.offset = 0;
1055                 var->red.length = 5;
1056                 var->green.length = 5;
1057                 var->blue.length = 5;
1058                 var->transp.length = 1;
1059                 var->transp.offset = 15;
1060                 break;
1061         case 16:
1062                 var->red.offset = 11;
1063                 var->green.offset = 5;
1064                 var->blue.offset = 0;
1065                 var->red.length = 5;
1066                 var->green.length = 6;
1067                 var->blue.length = 5;
1068                 var->transp.length = 0;
1069                 var->transp.offset = 0;
1070                 break;
1071         case 24:
1072                 var->red.offset = 16;
1073                 var->green.offset = 8;
1074                 var->blue.offset = 0;
1075                 var->red.length = 8;
1076                 var->green.length = 8;
1077                 var->blue.length = 8;
1078                 var->transp.length = 0;
1079                 var->transp.offset = 0;
1080                 break;
1081         case 32:
1082                 var->red.offset = 16;
1083                 var->green.offset = 8;
1084                 var->blue.offset = 0;
1085                 var->red.length = 8;
1086                 var->green.length = 8;
1087                 var->blue.length = 8;
1088                 var->transp.length = 8;
1089                 var->transp.offset = 24;
1090                 break;
1091         default:
1092                 return -EINVAL;
1093         }
1094         return 0;
1095 }
1096 EXPORT_SYMBOL(drm_fb_helper_check_var);
1097
1098 /**
1099  * drm_fb_helper_set_par - implementation for ->fb_set_par
1100  * @info: fbdev registered by the helper
1101  *
1102  * This will let fbcon do the mode init and is called at initialization time by
1103  * the fbdev core when registering the driver, and later on through the hotplug
1104  * callback.
1105  */
1106 int drm_fb_helper_set_par(struct fb_info *info)
1107 {
1108         struct drm_fb_helper *fb_helper = info->par;
1109         struct fb_var_screeninfo *var = &info->var;
1110
1111         if (oops_in_progress)
1112                 return -EBUSY;
1113
1114         if (var->pixclock != 0) {
1115                 DRM_ERROR("PIXEL CLOCK SET\n");
1116                 return -EINVAL;
1117         }
1118
1119         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1120
1121         return 0;
1122 }
1123 EXPORT_SYMBOL(drm_fb_helper_set_par);
1124
1125 /**
1126  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1127  * @var: updated screen information
1128  * @info: fbdev registered by the helper
1129  */
1130 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1131                               struct fb_info *info)
1132 {
1133         struct drm_fb_helper *fb_helper = info->par;
1134         struct drm_device *dev = fb_helper->dev;
1135         struct drm_mode_set *modeset;
1136         int ret = 0;
1137         int i;
1138
1139         if (oops_in_progress)
1140                 return -EBUSY;
1141
1142         drm_modeset_lock_all(dev);
1143         if (!drm_fb_helper_is_bound(fb_helper)) {
1144                 drm_modeset_unlock_all(dev);
1145                 return -EBUSY;
1146         }
1147
1148         for (i = 0; i < fb_helper->crtc_count; i++) {
1149                 modeset = &fb_helper->crtc_info[i].mode_set;
1150
1151                 modeset->x = var->xoffset;
1152                 modeset->y = var->yoffset;
1153
1154                 if (modeset->num_connectors) {
1155                         ret = drm_mode_set_config_internal(modeset);
1156                         if (!ret) {
1157                                 info->var.xoffset = var->xoffset;
1158                                 info->var.yoffset = var->yoffset;
1159                         }
1160                 }
1161         }
1162         drm_modeset_unlock_all(dev);
1163         return ret;
1164 }
1165 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1166
1167 /*
1168  * Allocates the backing storage and sets up the fbdev info structure through
1169  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1170  * notifier.
1171  */
1172 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1173                                          int preferred_bpp)
1174 {
1175         int ret = 0;
1176         int crtc_count = 0;
1177         int i;
1178         struct fb_info *info;
1179         struct drm_fb_helper_surface_size sizes;
1180         int gamma_size = 0;
1181
1182         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1183         sizes.surface_depth = 24;
1184         sizes.surface_bpp = 32;
1185         sizes.fb_width = (unsigned)-1;
1186         sizes.fb_height = (unsigned)-1;
1187
1188         /* if driver picks 8 or 16 by default use that
1189            for both depth/bpp */
1190         if (preferred_bpp != sizes.surface_bpp)
1191                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1192
1193         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1194         for (i = 0; i < fb_helper->connector_count; i++) {
1195                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1196                 struct drm_cmdline_mode *cmdline_mode;
1197
1198                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1199
1200                 if (cmdline_mode->bpp_specified) {
1201                         switch (cmdline_mode->bpp) {
1202                         case 8:
1203                                 sizes.surface_depth = sizes.surface_bpp = 8;
1204                                 break;
1205                         case 15:
1206                                 sizes.surface_depth = 15;
1207                                 sizes.surface_bpp = 16;
1208                                 break;
1209                         case 16:
1210                                 sizes.surface_depth = sizes.surface_bpp = 16;
1211                                 break;
1212                         case 24:
1213                                 sizes.surface_depth = sizes.surface_bpp = 24;
1214                                 break;
1215                         case 32:
1216                                 sizes.surface_depth = 24;
1217                                 sizes.surface_bpp = 32;
1218                                 break;
1219                         }
1220                         break;
1221                 }
1222         }
1223
1224         crtc_count = 0;
1225         for (i = 0; i < fb_helper->crtc_count; i++) {
1226                 struct drm_display_mode *desired_mode;
1227                 struct drm_mode_set *mode_set;
1228                 int x, y, j;
1229                 /* in case of tile group, are we the last tile vert or horiz?
1230                  * If no tile group you are always the last one both vertically
1231                  * and horizontally
1232                  */
1233                 bool lastv = true, lasth = true;
1234
1235                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1236                 mode_set = &fb_helper->crtc_info[i].mode_set;
1237
1238                 if (!desired_mode)
1239                         continue;
1240
1241                 crtc_count++;
1242
1243                 x = fb_helper->crtc_info[i].x;
1244                 y = fb_helper->crtc_info[i].y;
1245
1246                 if (gamma_size == 0)
1247                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1248
1249                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1250                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1251
1252                 for (j = 0; j < mode_set->num_connectors; j++) {
1253                         struct drm_connector *connector = mode_set->connectors[j];
1254                         if (connector->has_tile) {
1255                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1256                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1257                                 /* cloning to multiple tiles is just crazy-talk, so: */
1258                                 break;
1259                         }
1260                 }
1261
1262                 if (lasth)
1263                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1264                 if (lastv)
1265                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1266         }
1267
1268         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1269                 /* hmm everyone went away - assume VGA cable just fell out
1270                    and will come back later. */
1271                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1272                 sizes.fb_width = sizes.surface_width = 1024;
1273                 sizes.fb_height = sizes.surface_height = 768;
1274         }
1275
1276         /* push down into drivers */
1277         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1278         if (ret < 0)
1279                 return ret;
1280
1281         info = fb_helper->fbdev;
1282
1283         /*
1284          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1285          * events, but at init time drm_setup_crtcs needs to be called before
1286          * the fb is allocated (since we need to figure out the desired size of
1287          * the fb before we can allocate it ...). Hence we need to fix things up
1288          * here again.
1289          */
1290         for (i = 0; i < fb_helper->crtc_count; i++)
1291                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1292                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1293
1294
1295         info->var.pixclock = 0;
1296         if (register_framebuffer(info) < 0)
1297                 return -EINVAL;
1298
1299         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1300                         info->node, info->fix.id);
1301
1302         if (list_empty(&kernel_fb_helper_list)) {
1303                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1304         }
1305
1306         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1307
1308         return 0;
1309 }
1310
1311 /**
1312  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1313  * @info: fbdev registered by the helper
1314  * @pitch: desired pitch
1315  * @depth: desired depth
1316  *
1317  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1318  * fbdev emulations. Drivers which support acceleration methods which impose
1319  * additional constraints need to set up their own limits.
1320  *
1321  * Drivers should call this (or their equivalent setup code) from their
1322  * ->fb_probe callback.
1323  */
1324 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1325                             uint32_t depth)
1326 {
1327         info->fix.type = FB_TYPE_PACKED_PIXELS;
1328         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1329                 FB_VISUAL_TRUECOLOR;
1330         info->fix.mmio_start = 0;
1331         info->fix.mmio_len = 0;
1332         info->fix.type_aux = 0;
1333         info->fix.xpanstep = 1; /* doing it in hw */
1334         info->fix.ypanstep = 1; /* doing it in hw */
1335         info->fix.ywrapstep = 0;
1336         info->fix.accel = FB_ACCEL_NONE;
1337
1338         info->fix.line_length = pitch;
1339         return;
1340 }
1341 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1342
1343 /**
1344  * drm_fb_helper_fill_var - initalizes variable fbdev information
1345  * @info: fbdev instance to set up
1346  * @fb_helper: fb helper instance to use as template
1347  * @fb_width: desired fb width
1348  * @fb_height: desired fb height
1349  *
1350  * Sets up the variable fbdev metainformation from the given fb helper instance
1351  * and the drm framebuffer allocated in fb_helper->fb.
1352  *
1353  * Drivers should call this (or their equivalent setup code) from their
1354  * ->fb_probe callback after having allocated the fbdev backing
1355  * storage framebuffer.
1356  */
1357 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1358                             uint32_t fb_width, uint32_t fb_height)
1359 {
1360         struct drm_framebuffer *fb = fb_helper->fb;
1361         info->pseudo_palette = fb_helper->pseudo_palette;
1362         info->var.xres_virtual = fb->width;
1363         info->var.yres_virtual = fb->height;
1364         info->var.bits_per_pixel = fb->bits_per_pixel;
1365         info->var.accel_flags = FB_ACCELF_TEXT;
1366         info->var.xoffset = 0;
1367         info->var.yoffset = 0;
1368         info->var.activate = FB_ACTIVATE_NOW;
1369         info->var.height = -1;
1370         info->var.width = -1;
1371
1372         switch (fb->depth) {
1373         case 8:
1374                 info->var.red.offset = 0;
1375                 info->var.green.offset = 0;
1376                 info->var.blue.offset = 0;
1377                 info->var.red.length = 8; /* 8bit DAC */
1378                 info->var.green.length = 8;
1379                 info->var.blue.length = 8;
1380                 info->var.transp.offset = 0;
1381                 info->var.transp.length = 0;
1382                 break;
1383         case 15:
1384                 info->var.red.offset = 10;
1385                 info->var.green.offset = 5;
1386                 info->var.blue.offset = 0;
1387                 info->var.red.length = 5;
1388                 info->var.green.length = 5;
1389                 info->var.blue.length = 5;
1390                 info->var.transp.offset = 15;
1391                 info->var.transp.length = 1;
1392                 break;
1393         case 16:
1394                 info->var.red.offset = 11;
1395                 info->var.green.offset = 5;
1396                 info->var.blue.offset = 0;
1397                 info->var.red.length = 5;
1398                 info->var.green.length = 6;
1399                 info->var.blue.length = 5;
1400                 info->var.transp.offset = 0;
1401                 break;
1402         case 24:
1403                 info->var.red.offset = 16;
1404                 info->var.green.offset = 8;
1405                 info->var.blue.offset = 0;
1406                 info->var.red.length = 8;
1407                 info->var.green.length = 8;
1408                 info->var.blue.length = 8;
1409                 info->var.transp.offset = 0;
1410                 info->var.transp.length = 0;
1411                 break;
1412         case 32:
1413                 info->var.red.offset = 16;
1414                 info->var.green.offset = 8;
1415                 info->var.blue.offset = 0;
1416                 info->var.red.length = 8;
1417                 info->var.green.length = 8;
1418                 info->var.blue.length = 8;
1419                 info->var.transp.offset = 24;
1420                 info->var.transp.length = 8;
1421                 break;
1422         default:
1423                 break;
1424         }
1425
1426         info->var.xres = fb_width;
1427         info->var.yres = fb_height;
1428 }
1429 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1430
1431 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1432                                                uint32_t maxX,
1433                                                uint32_t maxY)
1434 {
1435         struct drm_connector *connector;
1436         int count = 0;
1437         int i;
1438
1439         for (i = 0; i < fb_helper->connector_count; i++) {
1440                 connector = fb_helper->connector_info[i]->connector;
1441                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1442         }
1443
1444         return count;
1445 }
1446
1447 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1448 {
1449         struct drm_display_mode *mode;
1450
1451         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1452                 if (mode->hdisplay > width ||
1453                     mode->vdisplay > height)
1454                         continue;
1455                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1456                         return mode;
1457         }
1458         return NULL;
1459 }
1460 EXPORT_SYMBOL(drm_has_preferred_mode);
1461
1462 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1463 {
1464         return fb_connector->connector->cmdline_mode.specified;
1465 }
1466
1467 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1468                                                       int width, int height)
1469 {
1470         struct drm_cmdline_mode *cmdline_mode;
1471         struct drm_display_mode *mode;
1472         bool prefer_non_interlace;
1473
1474         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1475         if (cmdline_mode->specified == false)
1476                 return NULL;
1477
1478         /* attempt to find a matching mode in the list of modes
1479          *  we have gotten so far, if not add a CVT mode that conforms
1480          */
1481         if (cmdline_mode->rb || cmdline_mode->margins)
1482                 goto create_mode;
1483
1484         prefer_non_interlace = !cmdline_mode->interlace;
1485 again:
1486         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1487                 /* check width/height */
1488                 if (mode->hdisplay != cmdline_mode->xres ||
1489                     mode->vdisplay != cmdline_mode->yres)
1490                         continue;
1491
1492                 if (cmdline_mode->refresh_specified) {
1493                         if (mode->vrefresh != cmdline_mode->refresh)
1494                                 continue;
1495                 }
1496
1497                 if (cmdline_mode->interlace) {
1498                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1499                                 continue;
1500                 } else if (prefer_non_interlace) {
1501                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1502                                 continue;
1503                 }
1504                 return mode;
1505         }
1506
1507         if (prefer_non_interlace) {
1508                 prefer_non_interlace = false;
1509                 goto again;
1510         }
1511
1512 create_mode:
1513         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1514                                                  cmdline_mode);
1515         list_add(&mode->head, &fb_helper_conn->connector->modes);
1516         return mode;
1517 }
1518 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1519
1520 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1521 {
1522         bool enable;
1523
1524         if (strict)
1525                 enable = connector->status == connector_status_connected;
1526         else
1527                 enable = connector->status != connector_status_disconnected;
1528
1529         return enable;
1530 }
1531
1532 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1533                                   bool *enabled)
1534 {
1535         bool any_enabled = false;
1536         struct drm_connector *connector;
1537         int i = 0;
1538
1539         for (i = 0; i < fb_helper->connector_count; i++) {
1540                 connector = fb_helper->connector_info[i]->connector;
1541                 enabled[i] = drm_connector_enabled(connector, true);
1542                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1543                           enabled[i] ? "yes" : "no");
1544                 any_enabled |= enabled[i];
1545         }
1546
1547         if (any_enabled)
1548                 return;
1549
1550         for (i = 0; i < fb_helper->connector_count; i++) {
1551                 connector = fb_helper->connector_info[i]->connector;
1552                 enabled[i] = drm_connector_enabled(connector, false);
1553         }
1554 }
1555
1556 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1557                               struct drm_display_mode **modes,
1558                               struct drm_fb_offset *offsets,
1559                               bool *enabled, int width, int height)
1560 {
1561         int count, i, j;
1562         bool can_clone = false;
1563         struct drm_fb_helper_connector *fb_helper_conn;
1564         struct drm_display_mode *dmt_mode, *mode;
1565
1566         /* only contemplate cloning in the single crtc case */
1567         if (fb_helper->crtc_count > 1)
1568                 return false;
1569
1570         count = 0;
1571         for (i = 0; i < fb_helper->connector_count; i++) {
1572                 if (enabled[i])
1573                         count++;
1574         }
1575
1576         /* only contemplate cloning if more than one connector is enabled */
1577         if (count <= 1)
1578                 return false;
1579
1580         /* check the command line or if nothing common pick 1024x768 */
1581         can_clone = true;
1582         for (i = 0; i < fb_helper->connector_count; i++) {
1583                 if (!enabled[i])
1584                         continue;
1585                 fb_helper_conn = fb_helper->connector_info[i];
1586                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1587                 if (!modes[i]) {
1588                         can_clone = false;
1589                         break;
1590                 }
1591                 for (j = 0; j < i; j++) {
1592                         if (!enabled[j])
1593                                 continue;
1594                         if (!drm_mode_equal(modes[j], modes[i]))
1595                                 can_clone = false;
1596                 }
1597         }
1598
1599         if (can_clone) {
1600                 DRM_DEBUG_KMS("can clone using command line\n");
1601                 return true;
1602         }
1603
1604         /* try and find a 1024x768 mode on each connector */
1605         can_clone = true;
1606         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1607
1608         for (i = 0; i < fb_helper->connector_count; i++) {
1609
1610                 if (!enabled[i])
1611                         continue;
1612
1613                 fb_helper_conn = fb_helper->connector_info[i];
1614                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1615                         if (drm_mode_equal(mode, dmt_mode))
1616                                 modes[i] = mode;
1617                 }
1618                 if (!modes[i])
1619                         can_clone = false;
1620         }
1621
1622         if (can_clone) {
1623                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1624                 return true;
1625         }
1626         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1627         return false;
1628 }
1629
1630 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1631                                 struct drm_display_mode **modes,
1632                                 struct drm_fb_offset *offsets,
1633                                 int idx,
1634                                 int h_idx, int v_idx)
1635 {
1636         struct drm_fb_helper_connector *fb_helper_conn;
1637         int i;
1638         int hoffset = 0, voffset = 0;
1639
1640         for (i = 0; i < fb_helper->connector_count; i++) {
1641                 fb_helper_conn = fb_helper->connector_info[i];
1642                 if (!fb_helper_conn->connector->has_tile)
1643                         continue;
1644
1645                 if (!modes[i] && (h_idx || v_idx)) {
1646                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1647                                       fb_helper_conn->connector->base.id);
1648                         continue;
1649                 }
1650                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1651                         hoffset += modes[i]->hdisplay;
1652
1653                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1654                         voffset += modes[i]->vdisplay;
1655         }
1656         offsets[idx].x = hoffset;
1657         offsets[idx].y = voffset;
1658         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1659         return 0;
1660 }
1661
1662 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1663                                  struct drm_display_mode **modes,
1664                                  struct drm_fb_offset *offsets,
1665                                  bool *enabled, int width, int height)
1666 {
1667         struct drm_fb_helper_connector *fb_helper_conn;
1668         int i;
1669         uint64_t conn_configured = 0, mask;
1670         int tile_pass = 0;
1671         mask = (1 << fb_helper->connector_count) - 1;
1672 retry:
1673         for (i = 0; i < fb_helper->connector_count; i++) {
1674                 fb_helper_conn = fb_helper->connector_info[i];
1675
1676                 if (conn_configured & (1 << i))
1677                         continue;
1678
1679                 if (enabled[i] == false) {
1680                         conn_configured |= (1 << i);
1681                         continue;
1682                 }
1683
1684                 /* first pass over all the untiled connectors */
1685                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1686                         continue;
1687
1688                 if (tile_pass == 1) {
1689                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1690                             fb_helper_conn->connector->tile_v_loc != 0)
1691                                 continue;
1692
1693                 } else {
1694                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1695                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1696                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1697                                 continue;
1698
1699                         /* find the tile offsets for this pass - need
1700                            to find all tiles left and above */
1701                         drm_get_tile_offsets(fb_helper, modes, offsets,
1702                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1703                 }
1704                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1705                               fb_helper_conn->connector->base.id);
1706
1707                 /* got for command line mode first */
1708                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1709                 if (!modes[i]) {
1710                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1711                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1712                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1713                 }
1714                 /* No preferred modes, pick one off the list */
1715                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1716                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1717                                 break;
1718                 }
1719                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1720                           "none");
1721                 conn_configured |= (1 << i);
1722         }
1723
1724         if ((conn_configured & mask) != mask) {
1725                 tile_pass++;
1726                 goto retry;
1727         }
1728         return true;
1729 }
1730
1731 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1732                           struct drm_fb_helper_crtc **best_crtcs,
1733                           struct drm_display_mode **modes,
1734                           int n, int width, int height)
1735 {
1736         int c, o;
1737         struct drm_device *dev = fb_helper->dev;
1738         struct drm_connector *connector;
1739         const struct drm_connector_helper_funcs *connector_funcs;
1740         struct drm_encoder *encoder;
1741         int my_score, best_score, score;
1742         struct drm_fb_helper_crtc **crtcs, *crtc;
1743         struct drm_fb_helper_connector *fb_helper_conn;
1744
1745         if (n == fb_helper->connector_count)
1746                 return 0;
1747
1748         fb_helper_conn = fb_helper->connector_info[n];
1749         connector = fb_helper_conn->connector;
1750
1751         best_crtcs[n] = NULL;
1752         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1753         if (modes[n] == NULL)
1754                 return best_score;
1755
1756         crtcs = kzalloc(dev->mode_config.num_connector *
1757                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1758         if (!crtcs)
1759                 return best_score;
1760
1761         my_score = 1;
1762         if (connector->status == connector_status_connected)
1763                 my_score++;
1764         if (drm_has_cmdline_mode(fb_helper_conn))
1765                 my_score++;
1766         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1767                 my_score++;
1768
1769         connector_funcs = connector->helper_private;
1770         encoder = connector_funcs->best_encoder(connector);
1771         if (!encoder)
1772                 goto out;
1773
1774         /* select a crtc for this connector and then attempt to configure
1775            remaining connectors */
1776         for (c = 0; c < fb_helper->crtc_count; c++) {
1777                 crtc = &fb_helper->crtc_info[c];
1778
1779                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1780                         continue;
1781
1782                 for (o = 0; o < n; o++)
1783                         if (best_crtcs[o] == crtc)
1784                                 break;
1785
1786                 if (o < n) {
1787                         /* ignore cloning unless only a single crtc */
1788                         if (fb_helper->crtc_count > 1)
1789                                 continue;
1790
1791                         if (!drm_mode_equal(modes[o], modes[n]))
1792                                 continue;
1793                 }
1794
1795                 crtcs[n] = crtc;
1796                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1797                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1798                                                   width, height);
1799                 if (score > best_score) {
1800                         best_score = score;
1801                         memcpy(best_crtcs, crtcs,
1802                                dev->mode_config.num_connector *
1803                                sizeof(struct drm_fb_helper_crtc *));
1804                 }
1805         }
1806 out:
1807         kfree(crtcs);
1808         return best_score;
1809 }
1810
1811 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1812 {
1813         struct drm_device *dev = fb_helper->dev;
1814         struct drm_fb_helper_crtc **crtcs;
1815         struct drm_display_mode **modes;
1816         struct drm_fb_offset *offsets;
1817         struct drm_mode_set *modeset;
1818         bool *enabled;
1819         int width, height;
1820         int i;
1821
1822         DRM_DEBUG_KMS("\n");
1823
1824         width = dev->mode_config.max_width;
1825         height = dev->mode_config.max_height;
1826
1827         crtcs = kcalloc(dev->mode_config.num_connector,
1828                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1829         modes = kcalloc(dev->mode_config.num_connector,
1830                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1831         offsets = kcalloc(dev->mode_config.num_connector,
1832                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1833         enabled = kcalloc(dev->mode_config.num_connector,
1834                           sizeof(bool), GFP_KERNEL);
1835         if (!crtcs || !modes || !enabled || !offsets) {
1836                 DRM_ERROR("Memory allocation failed\n");
1837                 goto out;
1838         }
1839
1840
1841         drm_enable_connectors(fb_helper, enabled);
1842
1843         if (!(fb_helper->funcs->initial_config &&
1844               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1845                                                offsets,
1846                                                enabled, width, height))) {
1847                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1848                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1849                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1850
1851                 if (!drm_target_cloned(fb_helper, modes, offsets,
1852                                        enabled, width, height) &&
1853                     !drm_target_preferred(fb_helper, modes, offsets,
1854                                           enabled, width, height))
1855                         DRM_ERROR("Unable to find initial modes\n");
1856
1857                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1858                               width, height);
1859
1860                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1861         }
1862
1863         /* need to set the modesets up here for use later */
1864         /* fill out the connector<->crtc mappings into the modesets */
1865         for (i = 0; i < fb_helper->crtc_count; i++) {
1866                 modeset = &fb_helper->crtc_info[i].mode_set;
1867                 modeset->num_connectors = 0;
1868                 modeset->fb = NULL;
1869         }
1870
1871         for (i = 0; i < fb_helper->connector_count; i++) {
1872                 struct drm_display_mode *mode = modes[i];
1873                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1874                 struct drm_fb_offset *offset = &offsets[i];
1875                 modeset = &fb_crtc->mode_set;
1876
1877                 if (mode && fb_crtc) {
1878                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1879                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1880                         fb_crtc->desired_mode = mode;
1881                         fb_crtc->x = offset->x;
1882                         fb_crtc->y = offset->y;
1883                         if (modeset->mode)
1884                                 drm_mode_destroy(dev, modeset->mode);
1885                         modeset->mode = drm_mode_duplicate(dev,
1886                                                            fb_crtc->desired_mode);
1887                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1888                         modeset->fb = fb_helper->fb;
1889                         modeset->x = offset->x;
1890                         modeset->y = offset->y;
1891                 }
1892         }
1893
1894         /* Clear out any old modes if there are no more connected outputs. */
1895         for (i = 0; i < fb_helper->crtc_count; i++) {
1896                 modeset = &fb_helper->crtc_info[i].mode_set;
1897                 if (modeset->num_connectors == 0) {
1898                         BUG_ON(modeset->fb);
1899                         if (modeset->mode)
1900                                 drm_mode_destroy(dev, modeset->mode);
1901                         modeset->mode = NULL;
1902                 }
1903         }
1904 out:
1905         kfree(crtcs);
1906         kfree(modes);
1907         kfree(offsets);
1908         kfree(enabled);
1909 }
1910
1911 /**
1912  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1913  * @fb_helper: fb_helper device struct
1914  * @bpp_sel: bpp value to use for the framebuffer configuration
1915  *
1916  * Scans the CRTCs and connectors and tries to put together an initial setup.
1917  * At the moment, this is a cloned configuration across all heads with
1918  * a new framebuffer object as the backing store.
1919  *
1920  * Note that this also registers the fbdev and so allows userspace to call into
1921  * the driver through the fbdev interfaces.
1922  *
1923  * This function will call down into the ->fb_probe callback to let
1924  * the driver allocate and initialize the fbdev info structure and the drm
1925  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1926  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1927  * values for the fbdev info structure.
1928  *
1929  * RETURNS:
1930  * Zero if everything went ok, nonzero otherwise.
1931  */
1932 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1933 {
1934         struct drm_device *dev = fb_helper->dev;
1935         int count = 0;
1936
1937         mutex_lock(&dev->mode_config.mutex);
1938         count = drm_fb_helper_probe_connector_modes(fb_helper,
1939                                                     dev->mode_config.max_width,
1940                                                     dev->mode_config.max_height);
1941         mutex_unlock(&dev->mode_config.mutex);
1942         /*
1943          * we shouldn't end up with no modes here.
1944          */
1945         if (count == 0)
1946                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1947
1948         drm_setup_crtcs(fb_helper);
1949
1950         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1951 }
1952 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1953
1954 /**
1955  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1956  *                               probing all the outputs attached to the fb
1957  * @fb_helper: the drm_fb_helper
1958  *
1959  * Scan the connectors attached to the fb_helper and try to put together a
1960  * setup after *notification of a change in output configuration.
1961  *
1962  * Called at runtime, takes the mode config locks to be able to check/change the
1963  * modeset configuration. Must be run from process context (which usually means
1964  * either the output polling work or a work item launched from the driver's
1965  * hotplug interrupt).
1966  *
1967  * Note that drivers may call this even before calling
1968  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1969  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1970  * not miss any hotplug events.
1971  *
1972  * RETURNS:
1973  * 0 on success and a non-zero error code otherwise.
1974  */
1975 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1976 {
1977         struct drm_device *dev = fb_helper->dev;
1978         u32 max_width, max_height;
1979
1980         mutex_lock(&fb_helper->dev->mode_config.mutex);
1981         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1982                 fb_helper->delayed_hotplug = true;
1983                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1984                 return 0;
1985         }
1986         DRM_DEBUG_KMS("\n");
1987
1988         max_width = fb_helper->fb->width;
1989         max_height = fb_helper->fb->height;
1990
1991         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1992         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1993
1994         drm_modeset_lock_all(dev);
1995         drm_setup_crtcs(fb_helper);
1996         drm_modeset_unlock_all(dev);
1997         drm_fb_helper_set_par(fb_helper->fbdev);
1998
1999         return 0;
2000 }
2001 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2002
2003 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2004  * but the module doesn't depend on any fb console symbols.  At least
2005  * attempt to load fbcon to avoid leaving the system without a usable console.
2006  */
2007 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2008 static int __init drm_fb_helper_modinit(void)
2009 {
2010         const char *name = "fbcon";
2011         struct module *fbcon;
2012
2013         mutex_lock(&module_mutex);
2014         fbcon = find_module(name);
2015         mutex_unlock(&module_mutex);
2016
2017         if (!fbcon)
2018                 request_module_nowait(name);
2019         return 0;
2020 }
2021
2022 module_init(drm_fb_helper_modinit);
2023 #endif