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  * Since this is part of the initial setup before the fbdev is published, no
  93  * locking is required.
  94  */
  95 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  96 {
  97         struct drm_device *dev = fb_helper->dev;
  98         struct drm_connector *connector;
  99         int i;
 100
 101         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 102                 struct drm_fb_helper_connector *fb_helper_connector;
 103
 104                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 105                 if (!fb_helper_connector)
 106                         goto fail;
 107
 108                 fb_helper_connector->connector = connector;
 109                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 110         }
 111         return 0;
 112 fail:
 113         for (i = 0; i < fb_helper->connector_count; i++) {
 114                 kfree(fb_helper->connector_info[i]);
 115                 fb_helper->connector_info[i] = NULL;
 116         }
 117         fb_helper->connector_count = 0;
 118         return -ENOMEM;
 119 }
 120 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 121
 122 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 123 {
 124         struct drm_fb_helper_connector *fb_helper_conn;
 125         int i;
 126
 127         for (i = 0; i < fb_helper->connector_count; i++) {
 128                 struct drm_cmdline_mode *mode;
 129                 struct drm_connector *connector;
 130                 char *option = NULL;
 131
 132                 fb_helper_conn = fb_helper->connector_info[i];
 133                 connector = fb_helper_conn->connector;
 134                 mode = &fb_helper_conn->cmdline_mode;
 135
 136                 /* do something on return - turn off connector maybe */
 137                 if (fb_get_options(connector->name, &option))
 138                         continue;
 139
 140                 if (drm_mode_parse_command_line_for_connector(option,
 141                                                               connector,
 142                                                               mode)) {
 143                         if (mode->force) {
 144                                 const char *s;
 145                                 switch (mode->force) {
 146                                 case DRM_FORCE_OFF:
 147                                         s = "OFF";
 148                                         break;
 149                                 case DRM_FORCE_ON_DIGITAL:
 150                                         s = "ON - dig";
 151                                         break;
 152                                 default:
 153                                 case DRM_FORCE_ON:
 154                                         s = "ON";
 155                                         break;
 156                                 }
 157
 158                                 DRM_INFO("forcing %s connector %s\n",
 159                                          connector->name, s);
 160                                 connector->force = mode->force;
 161                         }
 162
 163                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 164                                       connector->name,
 165                                       mode->xres, mode->yres,
 166                                       mode->refresh_specified ? mode->refresh : 60,
 167                                       mode->rb ? " reduced blanking" : "",
 168                                       mode->margins ? " with margins" : "",
 169                                       mode->interlace ?  " interlaced" : "");
 170                 }
 171
 172         }
 173         return 0;
 174 }
 175
 176 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 177 {
 178         uint16_t *r_base, *g_base, *b_base;
 179         int i;
 180
 181         if (helper->funcs->gamma_get == NULL)
 182                 return;
 183
 184         r_base = crtc->gamma_store;
 185         g_base = r_base + crtc->gamma_size;
 186         b_base = g_base + crtc->gamma_size;
 187
 188         for (i = 0; i < crtc->gamma_size; i++)
 189                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 190 }
 191
 192 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 193 {
 194         uint16_t *r_base, *g_base, *b_base;
 195
 196         if (crtc->funcs->gamma_set == NULL)
 197                 return;
 198
 199         r_base = crtc->gamma_store;
 200         g_base = r_base + crtc->gamma_size;
 201         b_base = g_base + crtc->gamma_size;
 202
 203         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 204 }
 205
 206 /**
 207  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 208  * @info: fbdev registered by the helper
 209  */
 210 int drm_fb_helper_debug_enter(struct fb_info *info)
 211 {
 212         struct drm_fb_helper *helper = info->par;
 213         struct drm_crtc_helper_funcs *funcs;
 214         int i;
 215
 216         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 217                 for (i = 0; i < helper->crtc_count; i++) {
 218                         struct drm_mode_set *mode_set =
 219                                 &helper->crtc_info[i].mode_set;
 220
 221                         if (!mode_set->crtc->enabled)
 222                                 continue;
 223
 224                         funcs = mode_set->crtc->helper_private;
 225                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 226                         funcs->mode_set_base_atomic(mode_set->crtc,
 227                                                     mode_set->fb,
 228                                                     mode_set->x,
 229                                                     mode_set->y,
 230                                                     ENTER_ATOMIC_MODE_SET);
 231                 }
 232         }
 233
 234         return 0;
 235 }
 236 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 237
 238 /* Find the real fb for a given fb helper CRTC */
 239 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 240 {
 241         struct drm_device *dev = crtc->dev;
 242         struct drm_crtc *c;
 243
 244         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 245                 if (crtc->base.id == c->base.id)
 246                         return c->primary->fb;
 247         }
 248
 249         return NULL;
 250 }
 251
 252 /**
 253  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 254  * @info: fbdev registered by the helper
 255  */
 256 int drm_fb_helper_debug_leave(struct fb_info *info)
 257 {
 258         struct drm_fb_helper *helper = info->par;
 259         struct drm_crtc *crtc;
 260         struct drm_crtc_helper_funcs *funcs;
 261         struct drm_framebuffer *fb;
 262         int i;
 263
 264         for (i = 0; i < helper->crtc_count; i++) {
 265                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 266                 crtc = mode_set->crtc;
 267                 funcs = crtc->helper_private;
 268                 fb = drm_mode_config_fb(crtc);
 269
 270                 if (!crtc->enabled)
 271                         continue;
 272
 273                 if (!fb) {
 274                         DRM_ERROR("no fb to restore??\n");
 275                         continue;
 276                 }
 277
 278                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 279                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 280                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 281         }
 282
 283         return 0;
 284 }
 285 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 286
 287 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 288 {
 289         struct drm_device *dev = fb_helper->dev;
 290         struct drm_plane *plane;
 291         bool error = false;
 292         int i;
 293
 294         drm_warn_on_modeset_not_all_locked(dev);
 295
 296         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 297                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 298                         drm_plane_force_disable(plane);
 299
 300         for (i = 0; i < fb_helper->crtc_count; i++) {
 301                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 302                 struct drm_crtc *crtc = mode_set->crtc;
 303                 int ret;
 304
 305                 if (crtc->funcs->cursor_set) {
 306                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 307                         if (ret)
 308                                 error = true;
 309                 }
 310
 311                 ret = drm_mode_set_config_internal(mode_set);
 312                 if (ret)
 313                         error = true;
 314         }
 315         return error;
 316 }
 317 /**
 318  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 319  * @fb_helper: fbcon to restore
 320  *
 321  * This should be called from driver's drm ->lastclose callback
 322  * when implementing an fbcon on top of kms using this helper. This ensures that
 323  * the user isn't greeted with a black screen when e.g. X dies.
 324  *
 325  * Use this variant if you need to bypass locking (panic), or already
 326  * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
 327  */
 328 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 329 {
 330         return restore_fbdev_mode(fb_helper);
 331 }
 332
 333 /**
 334  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 335  * @fb_helper: fbcon to restore
 336  *
 337  * This should be called from driver's drm ->lastclose callback
 338  * when implementing an fbcon on top of kms using this helper. This ensures that
 339  * the user isn't greeted with a black screen when e.g. X dies.
 340  */
 341 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 342 {
 343         struct drm_device *dev = fb_helper->dev;
 344         bool ret;
 345         drm_modeset_lock_all(dev);
 346         ret = restore_fbdev_mode(fb_helper);
 347         drm_modeset_unlock_all(dev);
 348         return ret;
 349 }
 350 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 351
 352 /*
 353  * restore fbcon display for all kms driver's using this helper, used for sysrq
 354  * and panic handling.
 355  */
 356 static bool drm_fb_helper_force_kernel_mode(void)
 357 {
 358         bool ret, error = false;
 359         struct drm_fb_helper *helper;
 360
 361         if (list_empty(&kernel_fb_helper_list))
 362                 return false;
 363
 364         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 365                 struct drm_device *dev = helper->dev;
 366
 367                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 368                         continue;
 369
 370                 /* NOTE: we use lockless flag below to avoid grabbing other
 371                  * modeset locks.  So just trylock the underlying mutex
 372                  * directly:
 373                  */
 374                 if (!mutex_trylock(&dev->mode_config.mutex)) {
 375                         error = true;
 376                         continue;
 377                 }
 378
 379                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 380                 if (ret)
 381                         error = true;
 382
 383                 mutex_unlock(&dev->mode_config.mutex);
 384         }
 385         return error;
 386 }
 387
 388 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 389                         void *panic_str)
 390 {
 391         /*
 392          * It's a waste of time and effort to switch back to text console
 393          * if the kernel should reboot before panic messages can be seen.
 394          */
 395         if (panic_timeout < 0)
 396                 return 0;
 397
 398         pr_err("panic occurred, switching back to text console\n");
 399         return drm_fb_helper_force_kernel_mode();
 400 }
 401
 402 static struct notifier_block paniced = {
 403         .notifier_call = drm_fb_helper_panic,
 404 };
 405
 406 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 407 {
 408         struct drm_device *dev = fb_helper->dev;
 409         struct drm_crtc *crtc;
 410         int bound = 0, crtcs_bound = 0;
 411
 412         /* Sometimes user space wants everything disabled, so don't steal the
 413          * display if there's a master. */
 414         if (dev->primary->master)
 415                 return false;
 416
 417         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 418                 if (crtc->primary->fb)
 419                         crtcs_bound++;
 420                 if (crtc->primary->fb == fb_helper->fb)
 421                         bound++;
 422         }
 423
 424         if (bound < crtcs_bound)
 425                 return false;
 426
 427         return true;
 428 }
 429
 430 #ifdef CONFIG_MAGIC_SYSRQ
 431 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 432 {
 433         bool ret;
 434         ret = drm_fb_helper_force_kernel_mode();
 435         if (ret == true)
 436                 DRM_ERROR("Failed to restore crtc configuration\n");
 437 }
 438 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 439
 440 static void drm_fb_helper_sysrq(int dummy1)
 441 {
 442         schedule_work(&drm_fb_helper_restore_work);
 443 }
 444
 445 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 446         .handler = drm_fb_helper_sysrq,
 447         .help_msg = "force-fb(V)",
 448         .action_msg = "Restore framebuffer console",
 449 };
 450 #else
 451 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 452 #endif
 453
 454 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 455 {
 456         struct drm_fb_helper *fb_helper = info->par;
 457         struct drm_device *dev = fb_helper->dev;
 458         struct drm_crtc *crtc;
 459         struct drm_connector *connector;
 460         int i, j;
 461
 462         /*
 463          * fbdev->blank can be called from irq context in case of a panic.
 464          * Since we already have our own special panic handler which will
 465          * restore the fbdev console mode completely, just bail out early.
 466          */
 467         if (oops_in_progress)
 468                 return;
 469
 470         /*
 471          * For each CRTC in this fb, turn the connectors on/off.
 472          */
 473         drm_modeset_lock_all(dev);
 474         if (!drm_fb_helper_is_bound(fb_helper)) {
 475                 drm_modeset_unlock_all(dev);
 476                 return;
 477         }
 478
 479         for (i = 0; i < fb_helper->crtc_count; i++) {
 480                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 481
 482                 if (!crtc->enabled)
 483                         continue;
 484
 485                 /* Walk the connectors & encoders on this fb turning them on/off */
 486                 for (j = 0; j < fb_helper->connector_count; j++) {
 487                         connector = fb_helper->connector_info[j]->connector;
 488                         connector->funcs->dpms(connector, dpms_mode);
 489                         drm_object_property_set_value(&connector->base,
 490                                 dev->mode_config.dpms_property, dpms_mode);
 491                 }
 492         }
 493         drm_modeset_unlock_all(dev);
 494 }
 495
 496 /**
 497  * drm_fb_helper_blank - implementation for ->fb_blank
 498  * @blank: desired blanking state
 499  * @info: fbdev registered by the helper
 500  */
 501 int drm_fb_helper_blank(int blank, struct fb_info *info)
 502 {
 503         switch (blank) {
 504         /* Display: On; HSync: On, VSync: On */
 505         case FB_BLANK_UNBLANK:
 506                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 507                 break;
 508         /* Display: Off; HSync: On, VSync: On */
 509         case FB_BLANK_NORMAL:
 510                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 511                 break;
 512         /* Display: Off; HSync: Off, VSync: On */
 513         case FB_BLANK_HSYNC_SUSPEND:
 514                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 515                 break;
 516         /* Display: Off; HSync: On, VSync: Off */
 517         case FB_BLANK_VSYNC_SUSPEND:
 518                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 519                 break;
 520         /* Display: Off; HSync: Off, VSync: Off */
 521         case FB_BLANK_POWERDOWN:
 522                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 523                 break;
 524         }
 525         return 0;
 526 }
 527 EXPORT_SYMBOL(drm_fb_helper_blank);
 528
 529 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 530 {
 531         int i;
 532
 533         for (i = 0; i < helper->connector_count; i++)
 534                 kfree(helper->connector_info[i]);
 535         kfree(helper->connector_info);
 536         for (i = 0; i < helper->crtc_count; i++) {
 537                 kfree(helper->crtc_info[i].mode_set.connectors);
 538                 if (helper->crtc_info[i].mode_set.mode)
 539                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 540         }
 541         kfree(helper->crtc_info);
 542 }
 543
 544 /**
 545  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 546  * @dev: DRM device
 547  * @helper: driver-allocated fbdev helper structure to set up
 548  * @funcs: pointer to structure of functions associate with this helper
 549  *
 550  * Sets up the bare minimum to make the framebuffer helper usable. This is
 551  * useful to implement race-free initialization of the polling helpers.
 552  */
 553 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 554                            const struct drm_fb_helper_funcs *funcs)
 555 {
 556         INIT_LIST_HEAD(&helper->kernel_fb_list);
 557         helper->funcs = funcs;
 558         helper->dev = dev;
 559 }
 560 EXPORT_SYMBOL(drm_fb_helper_prepare);
 561
 562 /**
 563  * drm_fb_helper_init - initialize a drm_fb_helper structure
 564  * @dev: drm device
 565  * @fb_helper: driver-allocated fbdev helper structure to initialize
 566  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 567  * @max_conn_count: max connector count
 568  *
 569  * This allocates the structures for the fbdev helper with the given limits.
 570  * Note that this won't yet touch the hardware (through the driver interfaces)
 571  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 572  * to allow driver writes more control over the exact init sequence.
 573  *
 574  * Drivers must call drm_fb_helper_prepare() before calling this function.
 575  *
 576  * RETURNS:
 577  * Zero if everything went ok, nonzero otherwise.
 578  */
 579 int drm_fb_helper_init(struct drm_device *dev,
 580                        struct drm_fb_helper *fb_helper,
 581                        int crtc_count, int max_conn_count)
 582 {
 583         struct drm_crtc *crtc;
 584         int i;
 585
 586         if (!max_conn_count)
 587                 return -EINVAL;
 588
 589         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 590         if (!fb_helper->crtc_info)
 591                 return -ENOMEM;
 592
 593         fb_helper->crtc_count = crtc_count;
 594         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 595         if (!fb_helper->connector_info) {
 596                 kfree(fb_helper->crtc_info);
 597                 return -ENOMEM;
 598         }
 599         fb_helper->connector_count = 0;
 600
 601         for (i = 0; i < crtc_count; i++) {
 602                 fb_helper->crtc_info[i].mode_set.connectors =
 603                         kcalloc(max_conn_count,
 604                                 sizeof(struct drm_connector *),
 605                                 GFP_KERNEL);
 606
 607                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 608                         goto out_free;
 609                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 610         }
 611
 612         i = 0;
 613         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 614                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 615                 i++;
 616         }
 617
 618         return 0;
 619 out_free:
 620         drm_fb_helper_crtc_free(fb_helper);
 621         return -ENOMEM;
 622 }
 623 EXPORT_SYMBOL(drm_fb_helper_init);
 624
 625 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 626 {
 627         if (!list_empty(&fb_helper->kernel_fb_list)) {
 628                 list_del(&fb_helper->kernel_fb_list);
 629                 if (list_empty(&kernel_fb_helper_list)) {
 630                         pr_info("drm: unregistered panic notifier\n");
 631                         atomic_notifier_chain_unregister(&panic_notifier_list,
 632                                                          &paniced);
 633                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 634                 }
 635         }
 636
 637         drm_fb_helper_crtc_free(fb_helper);
 638
 639 }
 640 EXPORT_SYMBOL(drm_fb_helper_fini);
 641
 642 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 643                      u16 blue, u16 regno, struct fb_info *info)
 644 {
 645         struct drm_fb_helper *fb_helper = info->par;
 646         struct drm_framebuffer *fb = fb_helper->fb;
 647         int pindex;
 648
 649         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 650                 u32 *palette;
 651                 u32 value;
 652                 /* place color in psuedopalette */
 653                 if (regno > 16)
 654                         return -EINVAL;
 655                 palette = (u32 *)info->pseudo_palette;
 656                 red >>= (16 - info->var.red.length);
 657                 green >>= (16 - info->var.green.length);
 658                 blue >>= (16 - info->var.blue.length);
 659                 value = (red << info->var.red.offset) |
 660                         (green << info->var.green.offset) |
 661                         (blue << info->var.blue.offset);
 662                 if (info->var.transp.length > 0) {
 663                         u32 mask = (1 << info->var.transp.length) - 1;
 664                         mask <<= info->var.transp.offset;
 665                         value |= mask;
 666                 }
 667                 palette[regno] = value;
 668                 return 0;
 669         }
 670
 671         /*
 672          * The driver really shouldn't advertise pseudo/directcolor
 673          * visuals if it can't deal with the palette.
 674          */
 675         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 676                     !fb_helper->funcs->gamma_get))
 677                 return -EINVAL;
 678
 679         pindex = regno;
 680
 681         if (fb->bits_per_pixel == 16) {
 682                 pindex = regno << 3;
 683
 684                 if (fb->depth == 16 && regno > 63)
 685                         return -EINVAL;
 686                 if (fb->depth == 15 && regno > 31)
 687                         return -EINVAL;
 688
 689                 if (fb->depth == 16) {
 690                         u16 r, g, b;
 691                         int i;
 692                         if (regno < 32) {
 693                                 for (i = 0; i < 8; i++)
 694                                         fb_helper->funcs->gamma_set(crtc, red,
 695                                                 green, blue, pindex + i);
 696                         }
 697
 698                         fb_helper->funcs->gamma_get(crtc, &r,
 699                                                     &g, &b,
 700                                                     pindex >> 1);
 701
 702                         for (i = 0; i < 4; i++)
 703                                 fb_helper->funcs->gamma_set(crtc, r,
 704                                                             green, b,
 705                                                             (pindex >> 1) + i);
 706                 }
 707         }
 708
 709         if (fb->depth != 16)
 710                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 711         return 0;
 712 }
 713
 714 /**
 715  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 716  * @cmap: cmap to set
 717  * @info: fbdev registered by the helper
 718  */
 719 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 720 {
 721         struct drm_fb_helper *fb_helper = info->par;
 722         struct drm_device *dev = fb_helper->dev;
 723         struct drm_crtc_helper_funcs *crtc_funcs;
 724         u16 *red, *green, *blue, *transp;
 725         struct drm_crtc *crtc;
 726         int i, j, rc = 0;
 727         int start;
 728
 729         drm_modeset_lock_all(dev);
 730         if (!drm_fb_helper_is_bound(fb_helper)) {
 731                 drm_modeset_unlock_all(dev);
 732                 return -EBUSY;
 733         }
 734
 735         for (i = 0; i < fb_helper->crtc_count; i++) {
 736                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 737                 crtc_funcs = crtc->helper_private;
 738
 739                 red = cmap->red;
 740                 green = cmap->green;
 741                 blue = cmap->blue;
 742                 transp = cmap->transp;
 743                 start = cmap->start;
 744
 745                 for (j = 0; j < cmap->len; j++) {
 746                         u16 hred, hgreen, hblue, htransp = 0xffff;
 747
 748                         hred = *red++;
 749                         hgreen = *green++;
 750                         hblue = *blue++;
 751
 752                         if (transp)
 753                                 htransp = *transp++;
 754
 755                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 756                         if (rc)
 757                                 goto out;
 758                 }
 759                 if (crtc_funcs->load_lut)
 760                         crtc_funcs->load_lut(crtc);
 761         }
 762  out:
 763         drm_modeset_unlock_all(dev);
 764         return rc;
 765 }
 766 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 767
 768 /**
 769  * drm_fb_helper_check_var - implementation for ->fb_check_var
 770  * @var: screeninfo to check
 771  * @info: fbdev registered by the helper
 772  */
 773 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 774                             struct fb_info *info)
 775 {
 776         struct drm_fb_helper *fb_helper = info->par;
 777         struct drm_framebuffer *fb = fb_helper->fb;
 778         int depth;
 779
 780         if (var->pixclock != 0 || in_dbg_master())
 781                 return -EINVAL;
 782
 783         /* Need to resize the fb object !!! */
 784         if (var->bits_per_pixel > fb->bits_per_pixel ||
 785             var->xres > fb->width || var->yres > fb->height ||
 786             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 787                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 788                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 789                           var->xres, var->yres, var->bits_per_pixel,
 790                           var->xres_virtual, var->yres_virtual,
 791                           fb->width, fb->height, fb->bits_per_pixel);
 792                 return -EINVAL;
 793         }
 794
 795         switch (var->bits_per_pixel) {
 796         case 16:
 797                 depth = (var->green.length == 6) ? 16 : 15;
 798                 break;
 799         case 32:
 800                 depth = (var->transp.length > 0) ? 32 : 24;
 801                 break;
 802         default:
 803                 depth = var->bits_per_pixel;
 804                 break;
 805         }
 806
 807         switch (depth) {
 808         case 8:
 809                 var->red.offset = 0;
 810                 var->green.offset = 0;
 811                 var->blue.offset = 0;
 812                 var->red.length = 8;
 813                 var->green.length = 8;
 814                 var->blue.length = 8;
 815                 var->transp.length = 0;
 816                 var->transp.offset = 0;
 817                 break;
 818         case 15:
 819                 var->red.offset = 10;
 820                 var->green.offset = 5;
 821                 var->blue.offset = 0;
 822                 var->red.length = 5;
 823                 var->green.length = 5;
 824                 var->blue.length = 5;
 825                 var->transp.length = 1;
 826                 var->transp.offset = 15;
 827                 break;
 828         case 16:
 829                 var->red.offset = 11;
 830                 var->green.offset = 5;
 831                 var->blue.offset = 0;
 832                 var->red.length = 5;
 833                 var->green.length = 6;
 834                 var->blue.length = 5;
 835                 var->transp.length = 0;
 836                 var->transp.offset = 0;
 837                 break;
 838         case 24:
 839                 var->red.offset = 16;
 840                 var->green.offset = 8;
 841                 var->blue.offset = 0;
 842                 var->red.length = 8;
 843                 var->green.length = 8;
 844                 var->blue.length = 8;
 845                 var->transp.length = 0;
 846                 var->transp.offset = 0;
 847                 break;
 848         case 32:
 849                 var->red.offset = 16;
 850                 var->green.offset = 8;
 851                 var->blue.offset = 0;
 852                 var->red.length = 8;
 853                 var->green.length = 8;
 854                 var->blue.length = 8;
 855                 var->transp.length = 8;
 856                 var->transp.offset = 24;
 857                 break;
 858         default:
 859                 return -EINVAL;
 860         }
 861         return 0;
 862 }
 863 EXPORT_SYMBOL(drm_fb_helper_check_var);
 864
 865 /**
 866  * drm_fb_helper_set_par - implementation for ->fb_set_par
 867  * @info: fbdev registered by the helper
 868  *
 869  * This will let fbcon do the mode init and is called at initialization time by
 870  * the fbdev core when registering the driver, and later on through the hotplug
 871  * callback.
 872  */
 873 int drm_fb_helper_set_par(struct fb_info *info)
 874 {
 875         struct drm_fb_helper *fb_helper = info->par;
 876         struct fb_var_screeninfo *var = &info->var;
 877
 878         if (var->pixclock != 0) {
 879                 DRM_ERROR("PIXEL CLOCK SET\n");
 880                 return -EINVAL;
 881         }
 882
 883         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 884
 885         if (fb_helper->delayed_hotplug) {
 886                 fb_helper->delayed_hotplug = false;
 887                 drm_fb_helper_hotplug_event(fb_helper);
 888         }
 889         return 0;
 890 }
 891 EXPORT_SYMBOL(drm_fb_helper_set_par);
 892
 893 /**
 894  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 895  * @var: updated screen information
 896  * @info: fbdev registered by the helper
 897  */
 898 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 899                               struct fb_info *info)
 900 {
 901         struct drm_fb_helper *fb_helper = info->par;
 902         struct drm_device *dev = fb_helper->dev;
 903         struct drm_mode_set *modeset;
 904         int ret = 0;
 905         int i;
 906
 907         drm_modeset_lock_all(dev);
 908         if (!drm_fb_helper_is_bound(fb_helper)) {
 909                 drm_modeset_unlock_all(dev);
 910                 return -EBUSY;
 911         }
 912
 913         for (i = 0; i < fb_helper->crtc_count; i++) {
 914                 modeset = &fb_helper->crtc_info[i].mode_set;
 915
 916                 modeset->x = var->xoffset;
 917                 modeset->y = var->yoffset;
 918
 919                 if (modeset->num_connectors) {
 920                         ret = drm_mode_set_config_internal(modeset);
 921                         if (!ret) {
 922                                 info->var.xoffset = var->xoffset;
 923                                 info->var.yoffset = var->yoffset;
 924                         }
 925                 }
 926         }
 927         drm_modeset_unlock_all(dev);
 928         return ret;
 929 }
 930 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 931
 932 /*
 933  * Allocates the backing storage and sets up the fbdev info structure through
 934  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 935  * notifier.
 936  */
 937 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 938                                          int preferred_bpp)
 939 {
 940         int ret = 0;
 941         int crtc_count = 0;
 942         int i;
 943         struct fb_info *info;
 944         struct drm_fb_helper_surface_size sizes;
 945         int gamma_size = 0;
 946
 947         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 948         sizes.surface_depth = 24;
 949         sizes.surface_bpp = 32;
 950         sizes.fb_width = (unsigned)-1;
 951         sizes.fb_height = (unsigned)-1;
 952
 953         /* if driver picks 8 or 16 by default use that
 954            for both depth/bpp */
 955         if (preferred_bpp != sizes.surface_bpp)
 956                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 957
 958         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 959         for (i = 0; i < fb_helper->connector_count; i++) {
 960                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 961                 struct drm_cmdline_mode *cmdline_mode;
 962
 963                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 964
 965                 if (cmdline_mode->bpp_specified) {
 966                         switch (cmdline_mode->bpp) {
 967                         case 8:
 968                                 sizes.surface_depth = sizes.surface_bpp = 8;
 969                                 break;
 970                         case 15:
 971                                 sizes.surface_depth = 15;
 972                                 sizes.surface_bpp = 16;
 973                                 break;
 974                         case 16:
 975                                 sizes.surface_depth = sizes.surface_bpp = 16;
 976                                 break;
 977                         case 24:
 978                                 sizes.surface_depth = sizes.surface_bpp = 24;
 979                                 break;
 980                         case 32:
 981                                 sizes.surface_depth = 24;
 982                                 sizes.surface_bpp = 32;
 983                                 break;
 984                         }
 985                         break;
 986                 }
 987         }
 988
 989         crtc_count = 0;
 990         for (i = 0; i < fb_helper->crtc_count; i++) {
 991                 struct drm_display_mode *desired_mode;
 992                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 993
 994                 if (desired_mode) {
 995                         if (gamma_size == 0)
 996                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 997                         if (desired_mode->hdisplay < sizes.fb_width)
 998                                 sizes.fb_width = desired_mode->hdisplay;
 999                         if (desired_mode->vdisplay < sizes.fb_height)
1000                                 sizes.fb_height = desired_mode->vdisplay;
1001                         if (desired_mode->hdisplay > sizes.surface_width)
1002                                 sizes.surface_width = desired_mode->hdisplay;
1003                         if (desired_mode->vdisplay > sizes.surface_height)
1004                                 sizes.surface_height = desired_mode->vdisplay;
1005                         crtc_count++;
1006                 }
1007         }
1008
1009         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1010                 /* hmm everyone went away - assume VGA cable just fell out
1011                    and will come back later. */
1012                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1013                 sizes.fb_width = sizes.surface_width = 1024;
1014                 sizes.fb_height = sizes.surface_height = 768;
1015         }
1016
1017         /* push down into drivers */
1018         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1019         if (ret < 0)
1020                 return ret;
1021
1022         info = fb_helper->fbdev;
1023
1024         /*
1025          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1026          * events, but at init time drm_setup_crtcs needs to be called before
1027          * the fb is allocated (since we need to figure out the desired size of
1028          * the fb before we can allocate it ...). Hence we need to fix things up
1029          * here again.
1030          */
1031         for (i = 0; i < fb_helper->crtc_count; i++)
1032                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1033                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1034
1035
1036         info->var.pixclock = 0;
1037         if (register_framebuffer(info) < 0)
1038                 return -EINVAL;
1039
1040         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1041                         info->node, info->fix.id);
1042
1043         /* Switch back to kernel console on panic */
1044         /* multi card linked list maybe */
1045         if (list_empty(&kernel_fb_helper_list)) {
1046                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1047                 atomic_notifier_chain_register(&panic_notifier_list,
1048                                                &paniced);
1049                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1050         }
1051
1052         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1053
1054         return 0;
1055 }
1056
1057 /**
1058  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1059  * @info: fbdev registered by the helper
1060  * @pitch: desired pitch
1061  * @depth: desired depth
1062  *
1063  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1064  * fbdev emulations. Drivers which support acceleration methods which impose
1065  * additional constraints need to set up their own limits.
1066  *
1067  * Drivers should call this (or their equivalent setup code) from their
1068  * ->fb_probe callback.
1069  */
1070 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1071                             uint32_t depth)
1072 {
1073         info->fix.type = FB_TYPE_PACKED_PIXELS;
1074         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1075                 FB_VISUAL_TRUECOLOR;
1076         info->fix.mmio_start = 0;
1077         info->fix.mmio_len = 0;
1078         info->fix.type_aux = 0;
1079         info->fix.xpanstep = 1; /* doing it in hw */
1080         info->fix.ypanstep = 1; /* doing it in hw */
1081         info->fix.ywrapstep = 0;
1082         info->fix.accel = FB_ACCEL_NONE;
1083
1084         info->fix.line_length = pitch;
1085         return;
1086 }
1087 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1088
1089 /**
1090  * drm_fb_helper_fill_var - initalizes variable fbdev information
1091  * @info: fbdev instance to set up
1092  * @fb_helper: fb helper instance to use as template
1093  * @fb_width: desired fb width
1094  * @fb_height: desired fb height
1095  *
1096  * Sets up the variable fbdev metainformation from the given fb helper instance
1097  * and the drm framebuffer allocated in fb_helper->fb.
1098  *
1099  * Drivers should call this (or their equivalent setup code) from their
1100  * ->fb_probe callback after having allocated the fbdev backing
1101  * storage framebuffer.
1102  */
1103 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1104                             uint32_t fb_width, uint32_t fb_height)
1105 {
1106         struct drm_framebuffer *fb = fb_helper->fb;
1107         info->pseudo_palette = fb_helper->pseudo_palette;
1108         info->var.xres_virtual = fb->width;
1109         info->var.yres_virtual = fb->height;
1110         info->var.bits_per_pixel = fb->bits_per_pixel;
1111         info->var.accel_flags = FB_ACCELF_TEXT;
1112         info->var.xoffset = 0;
1113         info->var.yoffset = 0;
1114         info->var.activate = FB_ACTIVATE_NOW;
1115         info->var.height = -1;
1116         info->var.width = -1;
1117
1118         switch (fb->depth) {
1119         case 8:
1120                 info->var.red.offset = 0;
1121                 info->var.green.offset = 0;
1122                 info->var.blue.offset = 0;
1123                 info->var.red.length = 8; /* 8bit DAC */
1124                 info->var.green.length = 8;
1125                 info->var.blue.length = 8;
1126                 info->var.transp.offset = 0;
1127                 info->var.transp.length = 0;
1128                 break;
1129         case 15:
1130                 info->var.red.offset = 10;
1131                 info->var.green.offset = 5;
1132                 info->var.blue.offset = 0;
1133                 info->var.red.length = 5;
1134                 info->var.green.length = 5;
1135                 info->var.blue.length = 5;
1136                 info->var.transp.offset = 15;
1137                 info->var.transp.length = 1;
1138                 break;
1139         case 16:
1140                 info->var.red.offset = 11;
1141                 info->var.green.offset = 5;
1142                 info->var.blue.offset = 0;
1143                 info->var.red.length = 5;
1144                 info->var.green.length = 6;
1145                 info->var.blue.length = 5;
1146                 info->var.transp.offset = 0;
1147                 break;
1148         case 24:
1149                 info->var.red.offset = 16;
1150                 info->var.green.offset = 8;
1151                 info->var.blue.offset = 0;
1152                 info->var.red.length = 8;
1153                 info->var.green.length = 8;
1154                 info->var.blue.length = 8;
1155                 info->var.transp.offset = 0;
1156                 info->var.transp.length = 0;
1157                 break;
1158         case 32:
1159                 info->var.red.offset = 16;
1160                 info->var.green.offset = 8;
1161                 info->var.blue.offset = 0;
1162                 info->var.red.length = 8;
1163                 info->var.green.length = 8;
1164                 info->var.blue.length = 8;
1165                 info->var.transp.offset = 24;
1166                 info->var.transp.length = 8;
1167                 break;
1168         default:
1169                 break;
1170         }
1171
1172         info->var.xres = fb_width;
1173         info->var.yres = fb_height;
1174 }
1175 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1176
1177 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1178                                                uint32_t maxX,
1179                                                uint32_t maxY)
1180 {
1181         struct drm_connector *connector;
1182         int count = 0;
1183         int i;
1184
1185         for (i = 0; i < fb_helper->connector_count; i++) {
1186                 connector = fb_helper->connector_info[i]->connector;
1187                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1188         }
1189
1190         return count;
1191 }
1192
1193 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1194 {
1195         struct drm_display_mode *mode;
1196
1197         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1198                 if (mode->hdisplay > width ||
1199                     mode->vdisplay > height)
1200                         continue;
1201                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1202                         return mode;
1203         }
1204         return NULL;
1205 }
1206 EXPORT_SYMBOL(drm_has_preferred_mode);
1207
1208 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1209 {
1210         struct drm_cmdline_mode *cmdline_mode;
1211         cmdline_mode = &fb_connector->cmdline_mode;
1212         return cmdline_mode->specified;
1213 }
1214
1215 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1216                                                       int width, int height)
1217 {
1218         struct drm_cmdline_mode *cmdline_mode;
1219         struct drm_display_mode *mode = NULL;
1220         bool prefer_non_interlace;
1221
1222         cmdline_mode = &fb_helper_conn->cmdline_mode;
1223         if (cmdline_mode->specified == false)
1224                 return mode;
1225
1226         /* attempt to find a matching mode in the list of modes
1227          *  we have gotten so far, if not add a CVT mode that conforms
1228          */
1229         if (cmdline_mode->rb || cmdline_mode->margins)
1230                 goto create_mode;
1231
1232         prefer_non_interlace = !cmdline_mode->interlace;
1233  again:
1234         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1235                 /* check width/height */
1236                 if (mode->hdisplay != cmdline_mode->xres ||
1237                     mode->vdisplay != cmdline_mode->yres)
1238                         continue;
1239
1240                 if (cmdline_mode->refresh_specified) {
1241                         if (mode->vrefresh != cmdline_mode->refresh)
1242                                 continue;
1243                 }
1244
1245                 if (cmdline_mode->interlace) {
1246                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1247                                 continue;
1248                 } else if (prefer_non_interlace) {
1249                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1250                                 continue;
1251                 }
1252                 return mode;
1253         }
1254
1255         if (prefer_non_interlace) {
1256                 prefer_non_interlace = false;
1257                 goto again;
1258         }
1259
1260 create_mode:
1261         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1262                                                  cmdline_mode);
1263         list_add(&mode->head, &fb_helper_conn->connector->modes);
1264         return mode;
1265 }
1266 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1267
1268 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1269 {
1270         bool enable;
1271
1272         if (strict)
1273                 enable = connector->status == connector_status_connected;
1274         else
1275                 enable = connector->status != connector_status_disconnected;
1276
1277         return enable;
1278 }
1279
1280 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1281                                   bool *enabled)
1282 {
1283         bool any_enabled = false;
1284         struct drm_connector *connector;
1285         int i = 0;
1286
1287         for (i = 0; i < fb_helper->connector_count; i++) {
1288                 connector = fb_helper->connector_info[i]->connector;
1289                 enabled[i] = drm_connector_enabled(connector, true);
1290                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1291                           enabled[i] ? "yes" : "no");
1292                 any_enabled |= enabled[i];
1293         }
1294
1295         if (any_enabled)
1296                 return;
1297
1298         for (i = 0; i < fb_helper->connector_count; i++) {
1299                 connector = fb_helper->connector_info[i]->connector;
1300                 enabled[i] = drm_connector_enabled(connector, false);
1301         }
1302 }
1303
1304 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1305                               struct drm_display_mode **modes,
1306                               bool *enabled, int width, int height)
1307 {
1308         int count, i, j;
1309         bool can_clone = false;
1310         struct drm_fb_helper_connector *fb_helper_conn;
1311         struct drm_display_mode *dmt_mode, *mode;
1312
1313         /* only contemplate cloning in the single crtc case */
1314         if (fb_helper->crtc_count > 1)
1315                 return false;
1316
1317         count = 0;
1318         for (i = 0; i < fb_helper->connector_count; i++) {
1319                 if (enabled[i])
1320                         count++;
1321         }
1322
1323         /* only contemplate cloning if more than one connector is enabled */
1324         if (count <= 1)
1325                 return false;
1326
1327         /* check the command line or if nothing common pick 1024x768 */
1328         can_clone = true;
1329         for (i = 0; i < fb_helper->connector_count; i++) {
1330                 if (!enabled[i])
1331                         continue;
1332                 fb_helper_conn = fb_helper->connector_info[i];
1333                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1334                 if (!modes[i]) {
1335                         can_clone = false;
1336                         break;
1337                 }
1338                 for (j = 0; j < i; j++) {
1339                         if (!enabled[j])
1340                                 continue;
1341                         if (!drm_mode_equal(modes[j], modes[i]))
1342                                 can_clone = false;
1343                 }
1344         }
1345
1346         if (can_clone) {
1347                 DRM_DEBUG_KMS("can clone using command line\n");
1348                 return true;
1349         }
1350
1351         /* try and find a 1024x768 mode on each connector */
1352         can_clone = true;
1353         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1354
1355         for (i = 0; i < fb_helper->connector_count; i++) {
1356
1357                 if (!enabled[i])
1358                         continue;
1359
1360                 fb_helper_conn = fb_helper->connector_info[i];
1361                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1362                         if (drm_mode_equal(mode, dmt_mode))
1363                                 modes[i] = mode;
1364                 }
1365                 if (!modes[i])
1366                         can_clone = false;
1367         }
1368
1369         if (can_clone) {
1370                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1371                 return true;
1372         }
1373         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1374         return false;
1375 }
1376
1377 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1378                                  struct drm_display_mode **modes,
1379                                  bool *enabled, int width, int height)
1380 {
1381         struct drm_fb_helper_connector *fb_helper_conn;
1382         int i;
1383
1384         for (i = 0; i < fb_helper->connector_count; i++) {
1385                 fb_helper_conn = fb_helper->connector_info[i];
1386
1387                 if (enabled[i] == false)
1388                         continue;
1389
1390                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1391                               fb_helper_conn->connector->base.id);
1392
1393                 /* got for command line mode first */
1394                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1395                 if (!modes[i]) {
1396                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1397                                       fb_helper_conn->connector->base.id);
1398                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1399                 }
1400                 /* No preferred modes, pick one off the list */
1401                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1402                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1403                                 break;
1404                 }
1405                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1406                           "none");
1407         }
1408         return true;
1409 }
1410
1411 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1412                           struct drm_fb_helper_crtc **best_crtcs,
1413                           struct drm_display_mode **modes,
1414                           int n, int width, int height)
1415 {
1416         int c, o;
1417         struct drm_device *dev = fb_helper->dev;
1418         struct drm_connector *connector;
1419         struct drm_connector_helper_funcs *connector_funcs;
1420         struct drm_encoder *encoder;
1421         int my_score, best_score, score;
1422         struct drm_fb_helper_crtc **crtcs, *crtc;
1423         struct drm_fb_helper_connector *fb_helper_conn;
1424
1425         if (n == fb_helper->connector_count)
1426                 return 0;
1427
1428         fb_helper_conn = fb_helper->connector_info[n];
1429         connector = fb_helper_conn->connector;
1430
1431         best_crtcs[n] = NULL;
1432         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1433         if (modes[n] == NULL)
1434                 return best_score;
1435
1436         crtcs = kzalloc(dev->mode_config.num_connector *
1437                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1438         if (!crtcs)
1439                 return best_score;
1440
1441         my_score = 1;
1442         if (connector->status == connector_status_connected)
1443                 my_score++;
1444         if (drm_has_cmdline_mode(fb_helper_conn))
1445                 my_score++;
1446         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1447                 my_score++;
1448
1449         connector_funcs = connector->helper_private;
1450         encoder = connector_funcs->best_encoder(connector);
1451         if (!encoder)
1452                 goto out;
1453
1454         /* select a crtc for this connector and then attempt to configure
1455            remaining connectors */
1456         for (c = 0; c < fb_helper->crtc_count; c++) {
1457                 crtc = &fb_helper->crtc_info[c];
1458
1459                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1460                         continue;
1461
1462                 for (o = 0; o < n; o++)
1463                         if (best_crtcs[o] == crtc)
1464                                 break;
1465
1466                 if (o < n) {
1467                         /* ignore cloning unless only a single crtc */
1468                         if (fb_helper->crtc_count > 1)
1469                                 continue;
1470
1471                         if (!drm_mode_equal(modes[o], modes[n]))
1472                                 continue;
1473                 }
1474
1475                 crtcs[n] = crtc;
1476                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1477                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1478                                                   width, height);
1479                 if (score > best_score) {
1480                         best_score = score;
1481                         memcpy(best_crtcs, crtcs,
1482                                dev->mode_config.num_connector *
1483                                sizeof(struct drm_fb_helper_crtc *));
1484                 }
1485         }
1486 out:
1487         kfree(crtcs);
1488         return best_score;
1489 }
1490
1491 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1492 {
1493         struct drm_device *dev = fb_helper->dev;
1494         struct drm_fb_helper_crtc **crtcs;
1495         struct drm_display_mode **modes;
1496         struct drm_mode_set *modeset;
1497         bool *enabled;
1498         int width, height;
1499         int i;
1500
1501         DRM_DEBUG_KMS("\n");
1502
1503         width = dev->mode_config.max_width;
1504         height = dev->mode_config.max_height;
1505
1506         crtcs = kcalloc(dev->mode_config.num_connector,
1507                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1508         modes = kcalloc(dev->mode_config.num_connector,
1509                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1510         enabled = kcalloc(dev->mode_config.num_connector,
1511                           sizeof(bool), GFP_KERNEL);
1512         if (!crtcs || !modes || !enabled) {
1513                 DRM_ERROR("Memory allocation failed\n");
1514                 goto out;
1515         }
1516
1517
1518         drm_enable_connectors(fb_helper, enabled);
1519
1520         if (!(fb_helper->funcs->initial_config &&
1521               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1522                                                enabled, width, height))) {
1523                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1524                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1525
1526                 if (!drm_target_cloned(fb_helper,
1527                                        modes, enabled, width, height) &&
1528                     !drm_target_preferred(fb_helper,
1529                                           modes, enabled, width, height))
1530                         DRM_ERROR("Unable to find initial modes\n");
1531
1532                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1533                               width, height);
1534
1535                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1536         }
1537
1538         /* need to set the modesets up here for use later */
1539         /* fill out the connector<->crtc mappings into the modesets */
1540         for (i = 0; i < fb_helper->crtc_count; i++) {
1541                 modeset = &fb_helper->crtc_info[i].mode_set;
1542                 modeset->num_connectors = 0;
1543                 modeset->fb = NULL;
1544         }
1545
1546         for (i = 0; i < fb_helper->connector_count; i++) {
1547                 struct drm_display_mode *mode = modes[i];
1548                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1549                 modeset = &fb_crtc->mode_set;
1550
1551                 if (mode && fb_crtc) {
1552                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1553                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1554                         fb_crtc->desired_mode = mode;
1555                         if (modeset->mode)
1556                                 drm_mode_destroy(dev, modeset->mode);
1557                         modeset->mode = drm_mode_duplicate(dev,
1558                                                            fb_crtc->desired_mode);
1559                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1560                         modeset->fb = fb_helper->fb;
1561                 }
1562         }
1563
1564         /* Clear out any old modes if there are no more connected outputs. */
1565         for (i = 0; i < fb_helper->crtc_count; i++) {
1566                 modeset = &fb_helper->crtc_info[i].mode_set;
1567                 if (modeset->num_connectors == 0) {
1568                         BUG_ON(modeset->fb);
1569                         BUG_ON(modeset->num_connectors);
1570                         if (modeset->mode)
1571                                 drm_mode_destroy(dev, modeset->mode);
1572                         modeset->mode = NULL;
1573                 }
1574         }
1575 out:
1576         kfree(crtcs);
1577         kfree(modes);
1578         kfree(enabled);
1579 }
1580
1581 /**
1582  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1583  * @fb_helper: fb_helper device struct
1584  * @bpp_sel: bpp value to use for the framebuffer configuration
1585  *
1586  * Scans the CRTCs and connectors and tries to put together an initial setup.
1587  * At the moment, this is a cloned configuration across all heads with
1588  * a new framebuffer object as the backing store.
1589  *
1590  * Note that this also registers the fbdev and so allows userspace to call into
1591  * the driver through the fbdev interfaces.
1592  *
1593  * This function will call down into the ->fb_probe callback to let
1594  * the driver allocate and initialize the fbdev info structure and the drm
1595  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1596  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1597  * values for the fbdev info structure.
1598  *
1599  * RETURNS:
1600  * Zero if everything went ok, nonzero otherwise.
1601  */
1602 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1603 {
1604         struct drm_device *dev = fb_helper->dev;
1605         int count = 0;
1606
1607         drm_fb_helper_parse_command_line(fb_helper);
1608
1609         mutex_lock(&dev->mode_config.mutex);
1610         count = drm_fb_helper_probe_connector_modes(fb_helper,
1611                                                     dev->mode_config.max_width,
1612                                                     dev->mode_config.max_height);
1613         mutex_unlock(&dev->mode_config.mutex);
1614         /*
1615          * we shouldn't end up with no modes here.
1616          */
1617         if (count == 0)
1618                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1619
1620         drm_setup_crtcs(fb_helper);
1621
1622         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1623 }
1624 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1625
1626 /**
1627  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1628  *                               probing all the outputs attached to the fb
1629  * @fb_helper: the drm_fb_helper
1630  *
1631  * Scan the connectors attached to the fb_helper and try to put together a
1632  * setup after *notification of a change in output configuration.
1633  *
1634  * Called at runtime, takes the mode config locks to be able to check/change the
1635  * modeset configuration. Must be run from process context (which usually means
1636  * either the output polling work or a work item launched from the driver's
1637  * hotplug interrupt).
1638  *
1639  * Note that drivers may call this even before calling
1640  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1641  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1642  * not miss any hotplug events.
1643  *
1644  * RETURNS:
1645  * 0 on success and a non-zero error code otherwise.
1646  */
1647 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1648 {
1649         struct drm_device *dev = fb_helper->dev;
1650         u32 max_width, max_height;
1651
1652         mutex_lock(&fb_helper->dev->mode_config.mutex);
1653         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1654                 fb_helper->delayed_hotplug = true;
1655                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1656                 return 0;
1657         }
1658         DRM_DEBUG_KMS("\n");
1659
1660         max_width = fb_helper->fb->width;
1661         max_height = fb_helper->fb->height;
1662
1663         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1664         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1665
1666         drm_modeset_lock_all(dev);
1667         drm_setup_crtcs(fb_helper);
1668         drm_modeset_unlock_all(dev);
1669         drm_fb_helper_set_par(fb_helper->fbdev);
1670
1671         return 0;
1672 }
1673 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1674
1675 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1676  * but the module doesn't depend on any fb console symbols.  At least
1677  * attempt to load fbcon to avoid leaving the system without a usable console.
1678  */
1679 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1680 static int __init drm_fb_helper_modinit(void)
1681 {
1682         const char *name = "fbcon";
1683         struct module *fbcon;
1684
1685         mutex_lock(&module_mutex);
1686         fbcon = find_module(name);
1687         mutex_unlock(&module_mutex);
1688
1689         if (!fbcon)
1690                 request_module_nowait(name);
1691         return 0;
1692 }
1693
1694 module_init(drm_fb_helper_modinit);
1695 #endif