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 <[email protected]>
   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 <[email protected]>
  28  *      Jesse Barnes <[email protected]>
  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 independantely 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 three-step process with drm_fb_helper_init(),
  53  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  54  * Drivers with fancier requirements than the default beheviour can override the
  55  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  56  *
  57  * At runtime drivers should restore the fbdev console by calling
  58  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  59  * should also notify the fb helper code from updates to the output
  60  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  61  * integration with the output polling code in drm_crtc_helper.c the modeset
  62  * code proves a ->output_poll_changed callback.
  63  *
  64  * All other functions exported by the fb helper library can be used to
  65  * implement the fbdev driver interface by the driver.
  66  */
  67
  68 /**
  69  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  70  *                                             emulation helper
  71  * @fb_helper: fbdev initialized with drm_fb_helper_init
  72  *
  73  * This functions adds all the available connectors for use with the given
  74  * fb_helper. This is a separate step to allow drivers to freely assign
  75  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  76  * not adequate to be used for the fbcon.
  77  *
  78  * Since this is part of the initial setup before the fbdev is published, no
  79  * locking is required.
  80  */
  81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  82 {
  83         struct drm_device *dev = fb_helper->dev;
  84         struct drm_connector *connector;
  85         int i;
  86
  87         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  88                 struct drm_fb_helper_connector *fb_helper_connector;
  89
  90                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  91                 if (!fb_helper_connector)
  92                         goto fail;
  93
  94                 fb_helper_connector->connector = connector;
  95                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  96         }
  97         return 0;
  98 fail:
  99         for (i = 0; i < fb_helper->connector_count; i++) {
 100                 kfree(fb_helper->connector_info[i]);
 101                 fb_helper->connector_info[i] = NULL;
 102         }
 103         fb_helper->connector_count = 0;
 104         return -ENOMEM;
 105 }
 106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 107
 108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 109 {
 110         struct drm_fb_helper_connector *fb_helper_conn;
 111         int i;
 112
 113         for (i = 0; i < fb_helper->connector_count; i++) {
 114                 struct drm_cmdline_mode *mode;
 115                 struct drm_connector *connector;
 116                 char *option = NULL;
 117
 118                 fb_helper_conn = fb_helper->connector_info[i];
 119                 connector = fb_helper_conn->connector;
 120                 mode = &fb_helper_conn->cmdline_mode;
 121
 122                 /* do something on return - turn off connector maybe */
 123                 if (fb_get_options(drm_get_connector_name(connector), &option))
 124                         continue;
 125
 126                 if (drm_mode_parse_command_line_for_connector(option,
 127                                                               connector,
 128                                                               mode)) {
 129                         if (mode->force) {
 130                                 const char *s;
 131                                 switch (mode->force) {
 132                                 case DRM_FORCE_OFF:
 133                                         s = "OFF";
 134                                         break;
 135                                 case DRM_FORCE_ON_DIGITAL:
 136                                         s = "ON - dig";
 137                                         break;
 138                                 default:
 139                                 case DRM_FORCE_ON:
 140                                         s = "ON";
 141                                         break;
 142                                 }
 143
 144                                 DRM_INFO("forcing %s connector %s\n",
 145                                          drm_get_connector_name(connector), s);
 146                                 connector->force = mode->force;
 147                         }
 148
 149                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 150                                       drm_get_connector_name(connector),
 151                                       mode->xres, mode->yres,
 152                                       mode->refresh_specified ? mode->refresh : 60,
 153                                       mode->rb ? " reduced blanking" : "",
 154                                       mode->margins ? " with margins" : "",
 155                                       mode->interlace ?  " interlaced" : "");
 156                 }
 157
 158         }
 159         return 0;
 160 }
 161
 162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 163 {
 164         uint16_t *r_base, *g_base, *b_base;
 165         int i;
 166
 167         if (helper->funcs->gamma_get == NULL)
 168                 return;
 169
 170         r_base = crtc->gamma_store;
 171         g_base = r_base + crtc->gamma_size;
 172         b_base = g_base + crtc->gamma_size;
 173
 174         for (i = 0; i < crtc->gamma_size; i++)
 175                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 176 }
 177
 178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 179 {
 180         uint16_t *r_base, *g_base, *b_base;
 181
 182         if (crtc->funcs->gamma_set == NULL)
 183                 return;
 184
 185         r_base = crtc->gamma_store;
 186         g_base = r_base + crtc->gamma_size;
 187         b_base = g_base + crtc->gamma_size;
 188
 189         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 190 }
 191
 192 /**
 193  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 194  * @info: fbdev registered by the helper
 195  */
 196 int drm_fb_helper_debug_enter(struct fb_info *info)
 197 {
 198         struct drm_fb_helper *helper = info->par;
 199         struct drm_crtc_helper_funcs *funcs;
 200         int i;
 201
 202         if (list_empty(&kernel_fb_helper_list))
 203                 return false;
 204
 205         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 206                 for (i = 0; i < helper->crtc_count; i++) {
 207                         struct drm_mode_set *mode_set =
 208                                 &helper->crtc_info[i].mode_set;
 209
 210                         if (!mode_set->crtc->enabled)
 211                                 continue;
 212
 213                         funcs = mode_set->crtc->helper_private;
 214                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 215                         funcs->mode_set_base_atomic(mode_set->crtc,
 216                                                     mode_set->fb,
 217                                                     mode_set->x,
 218                                                     mode_set->y,
 219                                                     ENTER_ATOMIC_MODE_SET);
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 226
 227 /* Find the real fb for a given fb helper CRTC */
 228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 229 {
 230         struct drm_device *dev = crtc->dev;
 231         struct drm_crtc *c;
 232
 233         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 234                 if (crtc->base.id == c->base.id)
 235                         return c->fb;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 /**
 242  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 243  * @info: fbdev registered by the helper
 244  */
 245 int drm_fb_helper_debug_leave(struct fb_info *info)
 246 {
 247         struct drm_fb_helper *helper = info->par;
 248         struct drm_crtc *crtc;
 249         struct drm_crtc_helper_funcs *funcs;
 250         struct drm_framebuffer *fb;
 251         int i;
 252
 253         for (i = 0; i < helper->crtc_count; i++) {
 254                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 255                 crtc = mode_set->crtc;
 256                 funcs = crtc->helper_private;
 257                 fb = drm_mode_config_fb(crtc);
 258
 259                 if (!crtc->enabled)
 260                         continue;
 261
 262                 if (!fb) {
 263                         DRM_ERROR("no fb to restore??\n");
 264                         continue;
 265                 }
 266
 267                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 268                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 269                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 270         }
 271
 272         return 0;
 273 }
 274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 275
 276 /**
 277  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 278  * @fb_helper: fbcon to restore
 279  *
 280  * This should be called from driver's drm ->lastclose callback
 281  * when implementing an fbcon on top of kms using this helper. This ensures that
 282  * the user isn't greeted with a black screen when e.g. X dies.
 283  */
 284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 285 {
 286         struct drm_device *dev = fb_helper->dev;
 287         struct drm_plane *plane;
 288         bool error = false;
 289         int i;
 290
 291         drm_warn_on_modeset_not_all_locked(dev);
 292
 293         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 294                 drm_plane_force_disable(plane);
 295
 296         for (i = 0; i < fb_helper->crtc_count; i++) {
 297                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 298                 struct drm_crtc *crtc = mode_set->crtc;
 299                 int ret;
 300
 301                 if (crtc->funcs->cursor_set) {
 302                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 303                         if (ret)
 304                                 error = true;
 305                 }
 306
 307                 ret = drm_mode_set_config_internal(mode_set);
 308                 if (ret)
 309                         error = true;
 310         }
 311         return error;
 312 }
 313 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 314
 315 /*
 316  * restore fbcon display for all kms driver's using this helper, used for sysrq
 317  * and panic handling.
 318  */
 319 static bool drm_fb_helper_force_kernel_mode(void)
 320 {
 321         bool ret, error = false;
 322         struct drm_fb_helper *helper;
 323
 324         if (list_empty(&kernel_fb_helper_list))
 325                 return false;
 326
 327         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 328                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 329                         continue;
 330
 331                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 332                 if (ret)
 333                         error = true;
 334         }
 335         return error;
 336 }
 337
 338 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 339                         void *panic_str)
 340 {
 341         /*
 342          * It's a waste of time and effort to switch back to text console
 343          * if the kernel should reboot before panic messages can be seen.
 344          */
 345         if (panic_timeout < 0)
 346                 return 0;
 347
 348         pr_err("panic occurred, switching back to text console\n");
 349         return drm_fb_helper_force_kernel_mode();
 350 }
 351
 352 static struct notifier_block paniced = {
 353         .notifier_call = drm_fb_helper_panic,
 354 };
 355
 356 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 357 {
 358         struct drm_device *dev = fb_helper->dev;
 359         struct drm_crtc *crtc;
 360         int bound = 0, crtcs_bound = 0;
 361
 362         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 363                 if (crtc->fb)
 364                         crtcs_bound++;
 365                 if (crtc->fb == fb_helper->fb)
 366                         bound++;
 367         }
 368
 369         if (bound < crtcs_bound)
 370                 return false;
 371         return true;
 372 }
 373
 374 #ifdef CONFIG_MAGIC_SYSRQ
 375 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 376 {
 377         bool ret;
 378         ret = drm_fb_helper_force_kernel_mode();
 379         if (ret == true)
 380                 DRM_ERROR("Failed to restore crtc configuration\n");
 381 }
 382 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 383
 384 static void drm_fb_helper_sysrq(int dummy1)
 385 {
 386         schedule_work(&drm_fb_helper_restore_work);
 387 }
 388
 389 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 390         .handler = drm_fb_helper_sysrq,
 391         .help_msg = "force-fb(V)",
 392         .action_msg = "Restore framebuffer console",
 393 };
 394 #else
 395 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 396 #endif
 397
 398 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 399 {
 400         struct drm_fb_helper *fb_helper = info->par;
 401         struct drm_device *dev = fb_helper->dev;
 402         struct drm_crtc *crtc;
 403         struct drm_connector *connector;
 404         int i, j;
 405
 406         /*
 407          * fbdev->blank can be called from irq context in case of a panic.
 408          * Since we already have our own special panic handler which will
 409          * restore the fbdev console mode completely, just bail out early.
 410          */
 411         if (oops_in_progress)
 412                 return;
 413
 414         /*
 415          * For each CRTC in this fb, turn the connectors on/off.
 416          */
 417         drm_modeset_lock_all(dev);
 418         if (!drm_fb_helper_is_bound(fb_helper)) {
 419                 drm_modeset_unlock_all(dev);
 420                 return;
 421         }
 422
 423         for (i = 0; i < fb_helper->crtc_count; i++) {
 424                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 425
 426                 if (!crtc->enabled)
 427                         continue;
 428
 429                 /* Walk the connectors & encoders on this fb turning them on/off */
 430                 for (j = 0; j < fb_helper->connector_count; j++) {
 431                         connector = fb_helper->connector_info[j]->connector;
 432                         connector->funcs->dpms(connector, dpms_mode);
 433                         drm_object_property_set_value(&connector->base,
 434                                 dev->mode_config.dpms_property, dpms_mode);
 435                 }
 436         }
 437         drm_modeset_unlock_all(dev);
 438 }
 439
 440 /**
 441  * drm_fb_helper_blank - implementation for ->fb_blank
 442  * @blank: desired blanking state
 443  * @info: fbdev registered by the helper
 444  */
 445 int drm_fb_helper_blank(int blank, struct fb_info *info)
 446 {
 447         switch (blank) {
 448         /* Display: On; HSync: On, VSync: On */
 449         case FB_BLANK_UNBLANK:
 450                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 451                 break;
 452         /* Display: Off; HSync: On, VSync: On */
 453         case FB_BLANK_NORMAL:
 454                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 455                 break;
 456         /* Display: Off; HSync: Off, VSync: On */
 457         case FB_BLANK_HSYNC_SUSPEND:
 458                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 459                 break;
 460         /* Display: Off; HSync: On, VSync: Off */
 461         case FB_BLANK_VSYNC_SUSPEND:
 462                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 463                 break;
 464         /* Display: Off; HSync: Off, VSync: Off */
 465         case FB_BLANK_POWERDOWN:
 466                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 467                 break;
 468         }
 469         return 0;
 470 }
 471 EXPORT_SYMBOL(drm_fb_helper_blank);
 472
 473 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 474 {
 475         int i;
 476
 477         for (i = 0; i < helper->connector_count; i++)
 478                 kfree(helper->connector_info[i]);
 479         kfree(helper->connector_info);
 480         for (i = 0; i < helper->crtc_count; i++) {
 481                 kfree(helper->crtc_info[i].mode_set.connectors);
 482                 if (helper->crtc_info[i].mode_set.mode)
 483                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 484         }
 485         kfree(helper->crtc_info);
 486 }
 487
 488 /**
 489  * drm_fb_helper_init - initialize a drm_fb_helper structure
 490  * @dev: drm device
 491  * @fb_helper: driver-allocated fbdev helper structure to initialize
 492  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 493  * @max_conn_count: max connector count
 494  *
 495  * This allocates the structures for the fbdev helper with the given limits.
 496  * Note that this won't yet touch the hardware (through the driver interfaces)
 497  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 498  * to allow driver writes more control over the exact init sequence.
 499  *
 500  * Drivers must set fb_helper->funcs before calling
 501  * drm_fb_helper_initial_config().
 502  *
 503  * RETURNS:
 504  * Zero if everything went ok, nonzero otherwise.
 505  */
 506 int drm_fb_helper_init(struct drm_device *dev,
 507                        struct drm_fb_helper *fb_helper,
 508                        int crtc_count, int max_conn_count)
 509 {
 510         struct drm_crtc *crtc;
 511         int i;
 512
 513         fb_helper->dev = dev;
 514
 515         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 516
 517         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 518         if (!fb_helper->crtc_info)
 519                 return -ENOMEM;
 520
 521         fb_helper->crtc_count = crtc_count;
 522         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 523         if (!fb_helper->connector_info) {
 524                 kfree(fb_helper->crtc_info);
 525                 return -ENOMEM;
 526         }
 527         fb_helper->connector_count = 0;
 528
 529         for (i = 0; i < crtc_count; i++) {
 530                 fb_helper->crtc_info[i].mode_set.connectors =
 531                         kcalloc(max_conn_count,
 532                                 sizeof(struct drm_connector *),
 533                                 GFP_KERNEL);
 534
 535                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 536                         goto out_free;
 537                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 538         }
 539
 540         i = 0;
 541         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 542                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 543                 i++;
 544         }
 545
 546         return 0;
 547 out_free:
 548         drm_fb_helper_crtc_free(fb_helper);
 549         return -ENOMEM;
 550 }
 551 EXPORT_SYMBOL(drm_fb_helper_init);
 552
 553 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 554 {
 555         if (!list_empty(&fb_helper->kernel_fb_list)) {
 556                 list_del(&fb_helper->kernel_fb_list);
 557                 if (list_empty(&kernel_fb_helper_list)) {
 558                         pr_info("drm: unregistered panic notifier\n");
 559                         atomic_notifier_chain_unregister(&panic_notifier_list,
 560                                                          &paniced);
 561                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 562                 }
 563         }
 564
 565         drm_fb_helper_crtc_free(fb_helper);
 566
 567 }
 568 EXPORT_SYMBOL(drm_fb_helper_fini);
 569
 570 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 571                      u16 blue, u16 regno, struct fb_info *info)
 572 {
 573         struct drm_fb_helper *fb_helper = info->par;
 574         struct drm_framebuffer *fb = fb_helper->fb;
 575         int pindex;
 576
 577         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 578                 u32 *palette;
 579                 u32 value;
 580                 /* place color in psuedopalette */
 581                 if (regno > 16)
 582                         return -EINVAL;
 583                 palette = (u32 *)info->pseudo_palette;
 584                 red >>= (16 - info->var.red.length);
 585                 green >>= (16 - info->var.green.length);
 586                 blue >>= (16 - info->var.blue.length);
 587                 value = (red << info->var.red.offset) |
 588                         (green << info->var.green.offset) |
 589                         (blue << info->var.blue.offset);
 590                 if (info->var.transp.length > 0) {
 591                         u32 mask = (1 << info->var.transp.length) - 1;
 592                         mask <<= info->var.transp.offset;
 593                         value |= mask;
 594                 }
 595                 palette[regno] = value;
 596                 return 0;
 597         }
 598
 599         /*
 600          * The driver really shouldn't advertise pseudo/directcolor
 601          * visuals if it can't deal with the palette.
 602          */
 603         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 604                     !fb_helper->funcs->gamma_get))
 605                 return -EINVAL;
 606
 607         pindex = regno;
 608
 609         if (fb->bits_per_pixel == 16) {
 610                 pindex = regno << 3;
 611
 612                 if (fb->depth == 16 && regno > 63)
 613                         return -EINVAL;
 614                 if (fb->depth == 15 && regno > 31)
 615                         return -EINVAL;
 616
 617                 if (fb->depth == 16) {
 618                         u16 r, g, b;
 619                         int i;
 620                         if (regno < 32) {
 621                                 for (i = 0; i < 8; i++)
 622                                         fb_helper->funcs->gamma_set(crtc, red,
 623                                                 green, blue, pindex + i);
 624                         }
 625
 626                         fb_helper->funcs->gamma_get(crtc, &r,
 627                                                     &g, &b,
 628                                                     pindex >> 1);
 629
 630                         for (i = 0; i < 4; i++)
 631                                 fb_helper->funcs->gamma_set(crtc, r,
 632                                                             green, b,
 633                                                             (pindex >> 1) + i);
 634                 }
 635         }
 636
 637         if (fb->depth != 16)
 638                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 639         return 0;
 640 }
 641
 642 /**
 643  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 644  * @cmap: cmap to set
 645  * @info: fbdev registered by the helper
 646  */
 647 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 648 {
 649         struct drm_fb_helper *fb_helper = info->par;
 650         struct drm_device *dev = fb_helper->dev;
 651         struct drm_crtc_helper_funcs *crtc_funcs;
 652         u16 *red, *green, *blue, *transp;
 653         struct drm_crtc *crtc;
 654         int i, j, rc = 0;
 655         int start;
 656
 657         drm_modeset_lock_all(dev);
 658         if (!drm_fb_helper_is_bound(fb_helper)) {
 659                 drm_modeset_unlock_all(dev);
 660                 return -EBUSY;
 661         }
 662
 663         for (i = 0; i < fb_helper->crtc_count; i++) {
 664                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 665                 crtc_funcs = crtc->helper_private;
 666
 667                 red = cmap->red;
 668                 green = cmap->green;
 669                 blue = cmap->blue;
 670                 transp = cmap->transp;
 671                 start = cmap->start;
 672
 673                 for (j = 0; j < cmap->len; j++) {
 674                         u16 hred, hgreen, hblue, htransp = 0xffff;
 675
 676                         hred = *red++;
 677                         hgreen = *green++;
 678                         hblue = *blue++;
 679
 680                         if (transp)
 681                                 htransp = *transp++;
 682
 683                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 684                         if (rc)
 685                                 goto out;
 686                 }
 687                 if (crtc_funcs->load_lut)
 688                         crtc_funcs->load_lut(crtc);
 689         }
 690  out:
 691         drm_modeset_unlock_all(dev);
 692         return rc;
 693 }
 694 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 695
 696 /**
 697  * drm_fb_helper_check_var - implementation for ->fb_check_var
 698  * @var: screeninfo to check
 699  * @info: fbdev registered by the helper
 700  */
 701 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 702                             struct fb_info *info)
 703 {
 704         struct drm_fb_helper *fb_helper = info->par;
 705         struct drm_framebuffer *fb = fb_helper->fb;
 706         int depth;
 707
 708         if (var->pixclock != 0 || in_dbg_master())
 709                 return -EINVAL;
 710
 711         /* Need to resize the fb object !!! */
 712         if (var->bits_per_pixel > fb->bits_per_pixel ||
 713             var->xres > fb->width || var->yres > fb->height ||
 714             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 715                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 716                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 717                           var->xres, var->yres, var->bits_per_pixel,
 718                           var->xres_virtual, var->yres_virtual,
 719                           fb->width, fb->height, fb->bits_per_pixel);
 720                 return -EINVAL;
 721         }
 722
 723         switch (var->bits_per_pixel) {
 724         case 16:
 725                 depth = (var->green.length == 6) ? 16 : 15;
 726                 break;
 727         case 32:
 728                 depth = (var->transp.length > 0) ? 32 : 24;
 729                 break;
 730         default:
 731                 depth = var->bits_per_pixel;
 732                 break;
 733         }
 734
 735         switch (depth) {
 736         case 8:
 737                 var->red.offset = 0;
 738                 var->green.offset = 0;
 739                 var->blue.offset = 0;
 740                 var->red.length = 8;
 741                 var->green.length = 8;
 742                 var->blue.length = 8;
 743                 var->transp.length = 0;
 744                 var->transp.offset = 0;
 745                 break;
 746         case 15:
 747                 var->red.offset = 10;
 748                 var->green.offset = 5;
 749                 var->blue.offset = 0;
 750                 var->red.length = 5;
 751                 var->green.length = 5;
 752                 var->blue.length = 5;
 753                 var->transp.length = 1;
 754                 var->transp.offset = 15;
 755                 break;
 756         case 16:
 757                 var->red.offset = 11;
 758                 var->green.offset = 5;
 759                 var->blue.offset = 0;
 760                 var->red.length = 5;
 761                 var->green.length = 6;
 762                 var->blue.length = 5;
 763                 var->transp.length = 0;
 764                 var->transp.offset = 0;
 765                 break;
 766         case 24:
 767                 var->red.offset = 16;
 768                 var->green.offset = 8;
 769                 var->blue.offset = 0;
 770                 var->red.length = 8;
 771                 var->green.length = 8;
 772                 var->blue.length = 8;
 773                 var->transp.length = 0;
 774                 var->transp.offset = 0;
 775                 break;
 776         case 32:
 777                 var->red.offset = 16;
 778                 var->green.offset = 8;
 779                 var->blue.offset = 0;
 780                 var->red.length = 8;
 781                 var->green.length = 8;
 782                 var->blue.length = 8;
 783                 var->transp.length = 8;
 784                 var->transp.offset = 24;
 785                 break;
 786         default:
 787                 return -EINVAL;
 788         }
 789         return 0;
 790 }
 791 EXPORT_SYMBOL(drm_fb_helper_check_var);
 792
 793 /**
 794  * drm_fb_helper_set_par - implementation for ->fb_set_par
 795  * @info: fbdev registered by the helper
 796  *
 797  * This will let fbcon do the mode init and is called at initialization time by
 798  * the fbdev core when registering the driver, and later on through the hotplug
 799  * callback.
 800  */
 801 int drm_fb_helper_set_par(struct fb_info *info)
 802 {
 803         struct drm_fb_helper *fb_helper = info->par;
 804         struct drm_device *dev = fb_helper->dev;
 805         struct fb_var_screeninfo *var = &info->var;
 806         int ret;
 807         int i;
 808
 809         if (var->pixclock != 0) {
 810                 DRM_ERROR("PIXEL CLOCK SET\n");
 811                 return -EINVAL;
 812         }
 813
 814         drm_modeset_lock_all(dev);
 815         for (i = 0; i < fb_helper->crtc_count; i++) {
 816                 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
 817                 if (ret) {
 818                         drm_modeset_unlock_all(dev);
 819                         return ret;
 820                 }
 821         }
 822         drm_modeset_unlock_all(dev);
 823
 824         if (fb_helper->delayed_hotplug) {
 825                 fb_helper->delayed_hotplug = false;
 826                 drm_fb_helper_hotplug_event(fb_helper);
 827         }
 828         return 0;
 829 }
 830 EXPORT_SYMBOL(drm_fb_helper_set_par);
 831
 832 /**
 833  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 834  * @var: updated screen information
 835  * @info: fbdev registered by the helper
 836  */
 837 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 838                               struct fb_info *info)
 839 {
 840         struct drm_fb_helper *fb_helper = info->par;
 841         struct drm_device *dev = fb_helper->dev;
 842         struct drm_mode_set *modeset;
 843         int ret = 0;
 844         int i;
 845
 846         drm_modeset_lock_all(dev);
 847         if (!drm_fb_helper_is_bound(fb_helper)) {
 848                 drm_modeset_unlock_all(dev);
 849                 return -EBUSY;
 850         }
 851
 852         for (i = 0; i < fb_helper->crtc_count; i++) {
 853                 modeset = &fb_helper->crtc_info[i].mode_set;
 854
 855                 modeset->x = var->xoffset;
 856                 modeset->y = var->yoffset;
 857
 858                 if (modeset->num_connectors) {
 859                         ret = drm_mode_set_config_internal(modeset);
 860                         if (!ret) {
 861                                 info->var.xoffset = var->xoffset;
 862                                 info->var.yoffset = var->yoffset;
 863                         }
 864                 }
 865         }
 866         drm_modeset_unlock_all(dev);
 867         return ret;
 868 }
 869 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 870
 871 /*
 872  * Allocates the backing storage and sets up the fbdev info structure through
 873  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 874  * notifier.
 875  */
 876 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 877                                          int preferred_bpp)
 878 {
 879         int ret = 0;
 880         int crtc_count = 0;
 881         int i;
 882         struct fb_info *info;
 883         struct drm_fb_helper_surface_size sizes;
 884         int gamma_size = 0;
 885
 886         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 887         sizes.surface_depth = 24;
 888         sizes.surface_bpp = 32;
 889         sizes.fb_width = (unsigned)-1;
 890         sizes.fb_height = (unsigned)-1;
 891
 892         /* if driver picks 8 or 16 by default use that
 893            for both depth/bpp */
 894         if (preferred_bpp != sizes.surface_bpp)
 895                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 896
 897         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 898         for (i = 0; i < fb_helper->connector_count; i++) {
 899                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 900                 struct drm_cmdline_mode *cmdline_mode;
 901
 902                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 903
 904                 if (cmdline_mode->bpp_specified) {
 905                         switch (cmdline_mode->bpp) {
 906                         case 8:
 907                                 sizes.surface_depth = sizes.surface_bpp = 8;
 908                                 break;
 909                         case 15:
 910                                 sizes.surface_depth = 15;
 911                                 sizes.surface_bpp = 16;
 912                                 break;
 913                         case 16:
 914                                 sizes.surface_depth = sizes.surface_bpp = 16;
 915                                 break;
 916                         case 24:
 917                                 sizes.surface_depth = sizes.surface_bpp = 24;
 918                                 break;
 919                         case 32:
 920                                 sizes.surface_depth = 24;
 921                                 sizes.surface_bpp = 32;
 922                                 break;
 923                         }
 924                         break;
 925                 }
 926         }
 927
 928         crtc_count = 0;
 929         for (i = 0; i < fb_helper->crtc_count; i++) {
 930                 struct drm_display_mode *desired_mode;
 931                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 932
 933                 if (desired_mode) {
 934                         if (gamma_size == 0)
 935                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 936                         if (desired_mode->hdisplay < sizes.fb_width)
 937                                 sizes.fb_width = desired_mode->hdisplay;
 938                         if (desired_mode->vdisplay < sizes.fb_height)
 939                                 sizes.fb_height = desired_mode->vdisplay;
 940                         if (desired_mode->hdisplay > sizes.surface_width)
 941                                 sizes.surface_width = desired_mode->hdisplay;
 942                         if (desired_mode->vdisplay > sizes.surface_height)
 943                                 sizes.surface_height = desired_mode->vdisplay;
 944                         crtc_count++;
 945                 }
 946         }
 947
 948         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 949                 /* hmm everyone went away - assume VGA cable just fell out
 950                    and will come back later. */
 951                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 952                 sizes.fb_width = sizes.surface_width = 1024;
 953                 sizes.fb_height = sizes.surface_height = 768;
 954         }
 955
 956         /* push down into drivers */
 957         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 958         if (ret < 0)
 959                 return ret;
 960
 961         info = fb_helper->fbdev;
 962
 963         /*
 964          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 965          * events, but at init time drm_setup_crtcs needs to be called before
 966          * the fb is allocated (since we need to figure out the desired size of
 967          * the fb before we can allocate it ...). Hence we need to fix things up
 968          * here again.
 969          */
 970         for (i = 0; i < fb_helper->crtc_count; i++)
 971                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 972                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 973
 974
 975         info->var.pixclock = 0;
 976         if (register_framebuffer(info) < 0)
 977                 return -EINVAL;
 978
 979         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 980                         info->node, info->fix.id);
 981
 982         /* Switch back to kernel console on panic */
 983         /* multi card linked list maybe */
 984         if (list_empty(&kernel_fb_helper_list)) {
 985                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 986                 atomic_notifier_chain_register(&panic_notifier_list,
 987                                                &paniced);
 988                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 989         }
 990
 991         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 992
 993         return 0;
 994 }
 995
 996 /**
 997  * drm_fb_helper_fill_fix - initializes fixed fbdev information
 998  * @info: fbdev registered by the helper
 999  * @pitch: desired pitch
1000  * @depth: desired depth
1001  *
1002  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1003  * fbdev emulations. Drivers which support acceleration methods which impose
1004  * additional constraints need to set up their own limits.
1005  *
1006  * Drivers should call this (or their equivalent setup code) from their
1007  * ->fb_probe callback.
1008  */
1009 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1010                             uint32_t depth)
1011 {
1012         info->fix.type = FB_TYPE_PACKED_PIXELS;
1013         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1014                 FB_VISUAL_TRUECOLOR;
1015         info->fix.mmio_start = 0;
1016         info->fix.mmio_len = 0;
1017         info->fix.type_aux = 0;
1018         info->fix.xpanstep = 1; /* doing it in hw */
1019         info->fix.ypanstep = 1; /* doing it in hw */
1020         info->fix.ywrapstep = 0;
1021         info->fix.accel = FB_ACCEL_NONE;
1022         info->fix.type_aux = 0;
1023
1024         info->fix.line_length = pitch;
1025         return;
1026 }
1027 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1028
1029 /**
1030  * drm_fb_helper_fill_var - initalizes variable fbdev information
1031  * @info: fbdev instance to set up
1032  * @fb_helper: fb helper instance to use as template
1033  * @fb_width: desired fb width
1034  * @fb_height: desired fb height
1035  *
1036  * Sets up the variable fbdev metainformation from the given fb helper instance
1037  * and the drm framebuffer allocated in fb_helper->fb.
1038  *
1039  * Drivers should call this (or their equivalent setup code) from their
1040  * ->fb_probe callback after having allocated the fbdev backing
1041  * storage framebuffer.
1042  */
1043 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1044                             uint32_t fb_width, uint32_t fb_height)
1045 {
1046         struct drm_framebuffer *fb = fb_helper->fb;
1047         info->pseudo_palette = fb_helper->pseudo_palette;
1048         info->var.xres_virtual = fb->width;
1049         info->var.yres_virtual = fb->height;
1050         info->var.bits_per_pixel = fb->bits_per_pixel;
1051         info->var.accel_flags = FB_ACCELF_TEXT;
1052         info->var.xoffset = 0;
1053         info->var.yoffset = 0;
1054         info->var.activate = FB_ACTIVATE_NOW;
1055         info->var.height = -1;
1056         info->var.width = -1;
1057
1058         switch (fb->depth) {
1059         case 8:
1060                 info->var.red.offset = 0;
1061                 info->var.green.offset = 0;
1062                 info->var.blue.offset = 0;
1063                 info->var.red.length = 8; /* 8bit DAC */
1064                 info->var.green.length = 8;
1065                 info->var.blue.length = 8;
1066                 info->var.transp.offset = 0;
1067                 info->var.transp.length = 0;
1068                 break;
1069         case 15:
1070                 info->var.red.offset = 10;
1071                 info->var.green.offset = 5;
1072                 info->var.blue.offset = 0;
1073                 info->var.red.length = 5;
1074                 info->var.green.length = 5;
1075                 info->var.blue.length = 5;
1076                 info->var.transp.offset = 15;
1077                 info->var.transp.length = 1;
1078                 break;
1079         case 16:
1080                 info->var.red.offset = 11;
1081                 info->var.green.offset = 5;
1082                 info->var.blue.offset = 0;
1083                 info->var.red.length = 5;
1084                 info->var.green.length = 6;
1085                 info->var.blue.length = 5;
1086                 info->var.transp.offset = 0;
1087                 break;
1088         case 24:
1089                 info->var.red.offset = 16;
1090                 info->var.green.offset = 8;
1091                 info->var.blue.offset = 0;
1092                 info->var.red.length = 8;
1093                 info->var.green.length = 8;
1094                 info->var.blue.length = 8;
1095                 info->var.transp.offset = 0;
1096                 info->var.transp.length = 0;
1097                 break;
1098         case 32:
1099                 info->var.red.offset = 16;
1100                 info->var.green.offset = 8;
1101                 info->var.blue.offset = 0;
1102                 info->var.red.length = 8;
1103                 info->var.green.length = 8;
1104                 info->var.blue.length = 8;
1105                 info->var.transp.offset = 24;
1106                 info->var.transp.length = 8;
1107                 break;
1108         default:
1109                 break;
1110         }
1111
1112         info->var.xres = fb_width;
1113         info->var.yres = fb_height;
1114 }
1115 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1116
1117 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1118                                                uint32_t maxX,
1119                                                uint32_t maxY)
1120 {
1121         struct drm_connector *connector;
1122         int count = 0;
1123         int i;
1124
1125         for (i = 0; i < fb_helper->connector_count; i++) {
1126                 connector = fb_helper->connector_info[i]->connector;
1127                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1128         }
1129
1130         return count;
1131 }
1132
1133 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1134 {
1135         struct drm_display_mode *mode;
1136
1137         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1138                 if (drm_mode_width(mode) > width ||
1139                     drm_mode_height(mode) > height)
1140                         continue;
1141                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1142                         return mode;
1143         }
1144         return NULL;
1145 }
1146
1147 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1148 {
1149         struct drm_cmdline_mode *cmdline_mode;
1150         cmdline_mode = &fb_connector->cmdline_mode;
1151         return cmdline_mode->specified;
1152 }
1153
1154 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1155                                                       int width, int height)
1156 {
1157         struct drm_cmdline_mode *cmdline_mode;
1158         struct drm_display_mode *mode = NULL;
1159
1160         cmdline_mode = &fb_helper_conn->cmdline_mode;
1161         if (cmdline_mode->specified == false)
1162                 return mode;
1163
1164         /* attempt to find a matching mode in the list of modes
1165          *  we have gotten so far, if not add a CVT mode that conforms
1166          */
1167         if (cmdline_mode->rb || cmdline_mode->margins)
1168                 goto create_mode;
1169
1170         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1171                 /* check width/height */
1172                 if (mode->hdisplay != cmdline_mode->xres ||
1173                     mode->vdisplay != cmdline_mode->yres)
1174                         continue;
1175
1176                 if (cmdline_mode->refresh_specified) {
1177                         if (mode->vrefresh != cmdline_mode->refresh)
1178                                 continue;
1179                 }
1180
1181                 if (cmdline_mode->interlace) {
1182                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1183                                 continue;
1184                 }
1185                 return mode;
1186         }
1187
1188 create_mode:
1189         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1190                                                  cmdline_mode);
1191         list_add(&mode->head, &fb_helper_conn->connector->modes);
1192         return mode;
1193 }
1194
1195 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1196 {
1197         bool enable;
1198
1199         if (strict)
1200                 enable = connector->status == connector_status_connected;
1201         else
1202                 enable = connector->status != connector_status_disconnected;
1203
1204         return enable;
1205 }
1206
1207 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1208                                   bool *enabled)
1209 {
1210         bool any_enabled = false;
1211         struct drm_connector *connector;
1212         int i = 0;
1213
1214         for (i = 0; i < fb_helper->connector_count; i++) {
1215                 connector = fb_helper->connector_info[i]->connector;
1216                 enabled[i] = drm_connector_enabled(connector, true);
1217                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1218                           enabled[i] ? "yes" : "no");
1219                 any_enabled |= enabled[i];
1220         }
1221
1222         if (any_enabled)
1223                 return;
1224
1225         for (i = 0; i < fb_helper->connector_count; i++) {
1226                 connector = fb_helper->connector_info[i]->connector;
1227                 enabled[i] = drm_connector_enabled(connector, false);
1228         }
1229 }
1230
1231 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1232                               struct drm_display_mode **modes,
1233                               bool *enabled, int width, int height)
1234 {
1235         int count, i, j;
1236         bool can_clone = false;
1237         struct drm_fb_helper_connector *fb_helper_conn;
1238         struct drm_display_mode *dmt_mode, *mode;
1239
1240         /* only contemplate cloning in the single crtc case */
1241         if (fb_helper->crtc_count > 1)
1242                 return false;
1243
1244         count = 0;
1245         for (i = 0; i < fb_helper->connector_count; i++) {
1246                 if (enabled[i])
1247                         count++;
1248         }
1249
1250         /* only contemplate cloning if more than one connector is enabled */
1251         if (count <= 1)
1252                 return false;
1253
1254         /* check the command line or if nothing common pick 1024x768 */
1255         can_clone = true;
1256         for (i = 0; i < fb_helper->connector_count; i++) {
1257                 if (!enabled[i])
1258                         continue;
1259                 fb_helper_conn = fb_helper->connector_info[i];
1260                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1261                 if (!modes[i]) {
1262                         can_clone = false;
1263                         break;
1264                 }
1265                 for (j = 0; j < i; j++) {
1266                         if (!enabled[j])
1267                                 continue;
1268                         if (!drm_mode_equal(modes[j], modes[i]))
1269                                 can_clone = false;
1270                 }
1271         }
1272
1273         if (can_clone) {
1274                 DRM_DEBUG_KMS("can clone using command line\n");
1275                 return true;
1276         }
1277
1278         /* try and find a 1024x768 mode on each connector */
1279         can_clone = true;
1280         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1281
1282         for (i = 0; i < fb_helper->connector_count; i++) {
1283
1284                 if (!enabled[i])
1285                         continue;
1286
1287                 fb_helper_conn = fb_helper->connector_info[i];
1288                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1289                         if (drm_mode_equal(mode, dmt_mode))
1290                                 modes[i] = mode;
1291                 }
1292                 if (!modes[i])
1293                         can_clone = false;
1294         }
1295
1296         if (can_clone) {
1297                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1298                 return true;
1299         }
1300         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1301         return false;
1302 }
1303
1304 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1305                                  struct drm_display_mode **modes,
1306                                  bool *enabled, int width, int height)
1307 {
1308         struct drm_fb_helper_connector *fb_helper_conn;
1309         int i;
1310
1311         for (i = 0; i < fb_helper->connector_count; i++) {
1312                 fb_helper_conn = fb_helper->connector_info[i];
1313
1314                 if (enabled[i] == false)
1315                         continue;
1316
1317                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1318                               fb_helper_conn->connector->base.id);
1319
1320                 /* got for command line mode first */
1321                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1322                 if (!modes[i]) {
1323                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1324                                       fb_helper_conn->connector->base.id);
1325                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1326                 }
1327                 /* No preferred modes, pick one off the list */
1328                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1329                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1330                                 break;
1331                 }
1332                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1333                           "none");
1334         }
1335         return true;
1336 }
1337
1338 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1339                           struct drm_fb_helper_crtc **best_crtcs,
1340                           struct drm_display_mode **modes,
1341                           int n, int width, int height)
1342 {
1343         int c, o;
1344         struct drm_device *dev = fb_helper->dev;
1345         struct drm_connector *connector;
1346         struct drm_connector_helper_funcs *connector_funcs;
1347         struct drm_encoder *encoder;
1348         int my_score, best_score, score;
1349         struct drm_fb_helper_crtc **crtcs, *crtc;
1350         struct drm_fb_helper_connector *fb_helper_conn;
1351
1352         if (n == fb_helper->connector_count)
1353                 return 0;
1354
1355         fb_helper_conn = fb_helper->connector_info[n];
1356         connector = fb_helper_conn->connector;
1357
1358         best_crtcs[n] = NULL;
1359         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1360         if (modes[n] == NULL)
1361                 return best_score;
1362
1363         crtcs = kzalloc(dev->mode_config.num_connector *
1364                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1365         if (!crtcs)
1366                 return best_score;
1367
1368         my_score = 1;
1369         if (connector->status == connector_status_connected)
1370                 my_score++;
1371         if (drm_has_cmdline_mode(fb_helper_conn))
1372                 my_score++;
1373         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1374                 my_score++;
1375
1376         connector_funcs = connector->helper_private;
1377         encoder = connector_funcs->best_encoder(connector);
1378         if (!encoder)
1379                 goto out;
1380
1381         /* select a crtc for this connector and then attempt to configure
1382            remaining connectors */
1383         for (c = 0; c < fb_helper->crtc_count; c++) {
1384                 crtc = &fb_helper->crtc_info[c];
1385
1386                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1387                         continue;
1388
1389                 for (o = 0; o < n; o++)
1390                         if (best_crtcs[o] == crtc)
1391                                 break;
1392
1393                 if (o < n) {
1394                         /* ignore cloning unless only a single crtc */
1395                         if (fb_helper->crtc_count > 1)
1396                                 continue;
1397
1398                         if (!drm_mode_equal(modes[o], modes[n]))
1399                                 continue;
1400                 }
1401
1402                 crtcs[n] = crtc;
1403                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1404                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1405                                                   width, height);
1406                 if (score > best_score) {
1407                         best_score = score;
1408                         memcpy(best_crtcs, crtcs,
1409                                dev->mode_config.num_connector *
1410                                sizeof(struct drm_fb_helper_crtc *));
1411                 }
1412         }
1413 out:
1414         kfree(crtcs);
1415         return best_score;
1416 }
1417
1418 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1419 {
1420         struct drm_device *dev = fb_helper->dev;
1421         struct drm_fb_helper_crtc **crtcs;
1422         struct drm_display_mode **modes;
1423         struct drm_mode_set *modeset;
1424         bool *enabled;
1425         int width, height;
1426         int i;
1427
1428         DRM_DEBUG_KMS("\n");
1429
1430         width = dev->mode_config.max_width;
1431         height = dev->mode_config.max_height;
1432
1433         crtcs = kcalloc(dev->mode_config.num_connector,
1434                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1435         modes = kcalloc(dev->mode_config.num_connector,
1436                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1437         enabled = kcalloc(dev->mode_config.num_connector,
1438                           sizeof(bool), GFP_KERNEL);
1439         if (!crtcs || !modes || !enabled) {
1440                 DRM_ERROR("Memory allocation failed\n");
1441                 goto out;
1442         }
1443
1444
1445         drm_enable_connectors(fb_helper, enabled);
1446
1447         if (!(fb_helper->funcs->initial_config &&
1448               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1449                                                enabled, width, height))) {
1450                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1451                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1452
1453                 if (!drm_target_cloned(fb_helper,
1454                                        modes, enabled, width, height) &&
1455                     !drm_target_preferred(fb_helper,
1456                                           modes, enabled, width, height))
1457                         DRM_ERROR("Unable to find initial modes\n");
1458
1459                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1460                               width, height);
1461
1462                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1463         }
1464
1465         /* need to set the modesets up here for use later */
1466         /* fill out the connector<->crtc mappings into the modesets */
1467         for (i = 0; i < fb_helper->crtc_count; i++) {
1468                 modeset = &fb_helper->crtc_info[i].mode_set;
1469                 modeset->num_connectors = 0;
1470                 modeset->fb = NULL;
1471         }
1472
1473         for (i = 0; i < fb_helper->connector_count; i++) {
1474                 struct drm_display_mode *mode = modes[i];
1475                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1476                 modeset = &fb_crtc->mode_set;
1477
1478                 if (mode && fb_crtc) {
1479                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1480                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1481                         fb_crtc->desired_mode = mode;
1482                         if (modeset->mode)
1483                                 drm_mode_destroy(dev, modeset->mode);
1484                         modeset->mode = drm_mode_duplicate(dev,
1485                                                            fb_crtc->desired_mode);
1486                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1487                         modeset->fb = fb_helper->fb;
1488                 }
1489         }
1490
1491         /* Clear out any old modes if there are no more connected outputs. */
1492         for (i = 0; i < fb_helper->crtc_count; i++) {
1493                 modeset = &fb_helper->crtc_info[i].mode_set;
1494                 if (modeset->num_connectors == 0) {
1495                         BUG_ON(modeset->fb);
1496                         BUG_ON(modeset->num_connectors);
1497                         if (modeset->mode)
1498                                 drm_mode_destroy(dev, modeset->mode);
1499                         modeset->mode = NULL;
1500                 }
1501         }
1502 out:
1503         kfree(crtcs);
1504         kfree(modes);
1505         kfree(enabled);
1506 }
1507
1508 /**
1509  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1510  * @fb_helper: fb_helper device struct
1511  * @bpp_sel: bpp value to use for the framebuffer configuration
1512  *
1513  * Scans the CRTCs and connectors and tries to put together an initial setup.
1514  * At the moment, this is a cloned configuration across all heads with
1515  * a new framebuffer object as the backing store.
1516  *
1517  * Note that this also registers the fbdev and so allows userspace to call into
1518  * the driver through the fbdev interfaces.
1519  *
1520  * This function will call down into the ->fb_probe callback to let
1521  * the driver allocate and initialize the fbdev info structure and the drm
1522  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1523  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1524  * values for the fbdev info structure.
1525  *
1526  * RETURNS:
1527  * Zero if everything went ok, nonzero otherwise.
1528  */
1529 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1530 {
1531         struct drm_device *dev = fb_helper->dev;
1532         int count = 0;
1533
1534         drm_fb_helper_parse_command_line(fb_helper);
1535
1536         count = drm_fb_helper_probe_connector_modes(fb_helper,
1537                                                     dev->mode_config.max_width,
1538                                                     dev->mode_config.max_height);
1539         /*
1540          * we shouldn't end up with no modes here.
1541          */
1542         if (count == 0)
1543                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1544
1545         drm_setup_crtcs(fb_helper);
1546
1547         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1548 }
1549 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1550
1551 /**
1552  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1553  *                               probing all the outputs attached to the fb
1554  * @fb_helper: the drm_fb_helper
1555  *
1556  * Scan the connectors attached to the fb_helper and try to put together a
1557  * setup after *notification of a change in output configuration.
1558  *
1559  * Called at runtime, takes the mode config locks to be able to check/change the
1560  * modeset configuration. Must be run from process context (which usually means
1561  * either the output polling work or a work item launched from the driver's
1562  * hotplug interrupt).
1563  *
1564  * Note that the driver must ensure that this is only called _after_ the fb has
1565  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1566  *
1567  * RETURNS:
1568  * 0 on success and a non-zero error code otherwise.
1569  */
1570 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1571 {
1572         struct drm_device *dev = fb_helper->dev;
1573         u32 max_width, max_height;
1574
1575         if (!fb_helper->fb)
1576                 return 0;
1577
1578         mutex_lock(&fb_helper->dev->mode_config.mutex);
1579         if (!drm_fb_helper_is_bound(fb_helper)) {
1580                 fb_helper->delayed_hotplug = true;
1581                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1582                 return 0;
1583         }
1584         DRM_DEBUG_KMS("\n");
1585
1586         max_width = fb_helper->fb->width;
1587         max_height = fb_helper->fb->height;
1588
1589         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1590         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1591
1592         drm_modeset_lock_all(dev);
1593         drm_setup_crtcs(fb_helper);
1594         drm_modeset_unlock_all(dev);
1595         drm_fb_helper_set_par(fb_helper->fbdev);
1596
1597         return 0;
1598 }
1599 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1600
1601 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1602  * but the module doesn't depend on any fb console symbols.  At least
1603  * attempt to load fbcon to avoid leaving the system without a usable console.
1604  */
1605 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1606 static int __init drm_fb_helper_modinit(void)
1607 {
1608         const char *name = "fbcon";
1609         struct module *fbcon;
1610
1611         mutex_lock(&module_mutex);
1612         fbcon = find_module(name);
1613         mutex_unlock(&module_mutex);
1614
1615         if (!fbcon)
1616                 request_module_nowait(name);
1617         return 0;
1618 }
1619
1620 module_init(drm_fb_helper_modinit);
1621 #endif