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 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  43 MODULE_DESCRIPTION("DRM KMS helper");
  44 MODULE_LICENSE("GPL and additional rights");
  45
  46 static LIST_HEAD(kernel_fb_helper_list);
  47
  48 /**
  49  * DOC: fbdev helpers
  50  *
  51  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  52  * mode setting driver. They can be used mostly independantely from the crtc
  53  * helper functions used by many drivers to implement the kernel mode setting
  54  * interfaces.
  55  *
  56  * Initialization is done as a three-step process with drm_fb_helper_init(),
  57  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  58  * Drivers with fancier requirements than the default beheviour can override the
  59  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  60  *
  61  * At runtime drivers should restore the fbdev console by calling
  62  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  63  * should also notify the fb helper code from updates to the output
  64  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  65  * integration with the output polling code in drm_crtc_helper.c the modeset
  66  * code proves a ->output_poll_changed callback.
  67  *
  68  * All other functions exported by the fb helper library can be used to
  69  * implement the fbdev driver interface by the driver.
  70  */
  71
  72 /**
  73  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  74  *                                             emulation helper
  75  * @fb_helper: fbdev initialized with drm_fb_helper_init
  76  *
  77  * This functions adds all the available connectors for use with the given
  78  * fb_helper. This is a separate step to allow drivers to freely assign
  79  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  80  * not adequate to be used for the fbcon.
  81  *
  82  * Since this is part of the initial setup before the fbdev is published, no
  83  * locking is required.
  84  */
  85 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  86 {
  87         struct drm_device *dev = fb_helper->dev;
  88         struct drm_connector *connector;
  89         int i;
  90
  91         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  92                 struct drm_fb_helper_connector *fb_helper_connector;
  93
  94                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  95                 if (!fb_helper_connector)
  96                         goto fail;
  97
  98                 fb_helper_connector->connector = connector;
  99                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 100         }
 101         return 0;
 102 fail:
 103         for (i = 0; i < fb_helper->connector_count; i++) {
 104                 kfree(fb_helper->connector_info[i]);
 105                 fb_helper->connector_info[i] = NULL;
 106         }
 107         fb_helper->connector_count = 0;
 108         return -ENOMEM;
 109 }
 110 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 111
 112 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 113 {
 114         struct drm_fb_helper_connector *fb_helper_conn;
 115         int i;
 116
 117         for (i = 0; i < fb_helper->connector_count; i++) {
 118                 struct drm_cmdline_mode *mode;
 119                 struct drm_connector *connector;
 120                 char *option = NULL;
 121
 122                 fb_helper_conn = fb_helper->connector_info[i];
 123                 connector = fb_helper_conn->connector;
 124                 mode = &fb_helper_conn->cmdline_mode;
 125
 126                 /* do something on return - turn off connector maybe */
 127                 if (fb_get_options(drm_get_connector_name(connector), &option))
 128                         continue;
 129
 130                 if (drm_mode_parse_command_line_for_connector(option,
 131                                                               connector,
 132                                                               mode)) {
 133                         if (mode->force) {
 134                                 const char *s;
 135                                 switch (mode->force) {
 136                                 case DRM_FORCE_OFF:
 137                                         s = "OFF";
 138                                         break;
 139                                 case DRM_FORCE_ON_DIGITAL:
 140                                         s = "ON - dig";
 141                                         break;
 142                                 default:
 143                                 case DRM_FORCE_ON:
 144                                         s = "ON";
 145                                         break;
 146                                 }
 147
 148                                 DRM_INFO("forcing %s connector %s\n",
 149                                          drm_get_connector_name(connector), s);
 150                                 connector->force = mode->force;
 151                         }
 152
 153                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 154                                       drm_get_connector_name(connector),
 155                                       mode->xres, mode->yres,
 156                                       mode->refresh_specified ? mode->refresh : 60,
 157                                       mode->rb ? " reduced blanking" : "",
 158                                       mode->margins ? " with margins" : "",
 159                                       mode->interlace ?  " interlaced" : "");
 160                 }
 161
 162         }
 163         return 0;
 164 }
 165
 166 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 167 {
 168         uint16_t *r_base, *g_base, *b_base;
 169         int i;
 170
 171         if (helper->funcs->gamma_get == NULL)
 172                 return;
 173
 174         r_base = crtc->gamma_store;
 175         g_base = r_base + crtc->gamma_size;
 176         b_base = g_base + crtc->gamma_size;
 177
 178         for (i = 0; i < crtc->gamma_size; i++)
 179                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 180 }
 181
 182 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 183 {
 184         uint16_t *r_base, *g_base, *b_base;
 185
 186         if (crtc->funcs->gamma_set == NULL)
 187                 return;
 188
 189         r_base = crtc->gamma_store;
 190         g_base = r_base + crtc->gamma_size;
 191         b_base = g_base + crtc->gamma_size;
 192
 193         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 194 }
 195
 196 /**
 197  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 198  * @info: fbdev registered by the helper
 199  */
 200 int drm_fb_helper_debug_enter(struct fb_info *info)
 201 {
 202         struct drm_fb_helper *helper = info->par;
 203         struct drm_crtc_helper_funcs *funcs;
 204         int i;
 205
 206         if (list_empty(&kernel_fb_helper_list))
 207                 return false;
 208
 209         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 210                 for (i = 0; i < helper->crtc_count; i++) {
 211                         struct drm_mode_set *mode_set =
 212                                 &helper->crtc_info[i].mode_set;
 213
 214                         if (!mode_set->crtc->enabled)
 215                                 continue;
 216
 217                         funcs = mode_set->crtc->helper_private;
 218                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 219                         funcs->mode_set_base_atomic(mode_set->crtc,
 220                                                     mode_set->fb,
 221                                                     mode_set->x,
 222                                                     mode_set->y,
 223                                                     ENTER_ATOMIC_MODE_SET);
 224                 }
 225         }
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 230
 231 /* Find the real fb for a given fb helper CRTC */
 232 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 233 {
 234         struct drm_device *dev = crtc->dev;
 235         struct drm_crtc *c;
 236
 237         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 238                 if (crtc->base.id == c->base.id)
 239                         return c->fb;
 240         }
 241
 242         return NULL;
 243 }
 244
 245 /**
 246  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 247  * @info: fbdev registered by the helper
 248  */
 249 int drm_fb_helper_debug_leave(struct fb_info *info)
 250 {
 251         struct drm_fb_helper *helper = info->par;
 252         struct drm_crtc *crtc;
 253         struct drm_crtc_helper_funcs *funcs;
 254         struct drm_framebuffer *fb;
 255         int i;
 256
 257         for (i = 0; i < helper->crtc_count; i++) {
 258                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 259                 crtc = mode_set->crtc;
 260                 funcs = crtc->helper_private;
 261                 fb = drm_mode_config_fb(crtc);
 262
 263                 if (!crtc->enabled)
 264                         continue;
 265
 266                 if (!fb) {
 267                         DRM_ERROR("no fb to restore??\n");
 268                         continue;
 269                 }
 270
 271                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 272                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 273                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 274         }
 275
 276         return 0;
 277 }
 278 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 279
 280 /**
 281  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 282  * @fb_helper: fbcon to restore
 283  *
 284  * This should be called from driver's drm ->lastclose callback
 285  * when implementing an fbcon on top of kms using this helper. This ensures that
 286  * the user isn't greeted with a black screen when e.g. X dies.
 287  */
 288 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 289 {
 290         struct drm_device *dev = fb_helper->dev;
 291         struct drm_plane *plane;
 292         bool error = false;
 293         int i;
 294
 295         drm_warn_on_modeset_not_all_locked(dev);
 296
 297         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 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 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 318
 319 /*
 320  * restore fbcon display for all kms driver's using this helper, used for sysrq
 321  * and panic handling.
 322  */
 323 static bool drm_fb_helper_force_kernel_mode(void)
 324 {
 325         bool ret, error = false;
 326         struct drm_fb_helper *helper;
 327
 328         if (list_empty(&kernel_fb_helper_list))
 329                 return false;
 330
 331         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 332                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 333                         continue;
 334
 335                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 336                 if (ret)
 337                         error = true;
 338         }
 339         return error;
 340 }
 341
 342 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 343                         void *panic_str)
 344 {
 345         /*
 346          * It's a waste of time and effort to switch back to text console
 347          * if the kernel should reboot before panic messages can be seen.
 348          */
 349         if (panic_timeout < 0)
 350                 return 0;
 351
 352         pr_err("panic occurred, switching back to text console\n");
 353         return drm_fb_helper_force_kernel_mode();
 354 }
 355
 356 static struct notifier_block paniced = {
 357         .notifier_call = drm_fb_helper_panic,
 358 };
 359
 360 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 361 {
 362         struct drm_device *dev = fb_helper->dev;
 363         struct drm_crtc *crtc;
 364         int bound = 0, crtcs_bound = 0;
 365
 366         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 367                 if (crtc->fb)
 368                         crtcs_bound++;
 369                 if (crtc->fb == fb_helper->fb)
 370                         bound++;
 371         }
 372
 373         if (bound < crtcs_bound)
 374                 return false;
 375         return true;
 376 }
 377
 378 #ifdef CONFIG_MAGIC_SYSRQ
 379 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 380 {
 381         bool ret;
 382         ret = drm_fb_helper_force_kernel_mode();
 383         if (ret == true)
 384                 DRM_ERROR("Failed to restore crtc configuration\n");
 385 }
 386 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 387
 388 static void drm_fb_helper_sysrq(int dummy1)
 389 {
 390         schedule_work(&drm_fb_helper_restore_work);
 391 }
 392
 393 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 394         .handler = drm_fb_helper_sysrq,
 395         .help_msg = "force-fb(V)",
 396         .action_msg = "Restore framebuffer console",
 397 };
 398 #else
 399 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 400 #endif
 401
 402 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 403 {
 404         struct drm_fb_helper *fb_helper = info->par;
 405         struct drm_device *dev = fb_helper->dev;
 406         struct drm_crtc *crtc;
 407         struct drm_connector *connector;
 408         int i, j;
 409
 410         /*
 411          * fbdev->blank can be called from irq context in case of a panic.
 412          * Since we already have our own special panic handler which will
 413          * restore the fbdev console mode completely, just bail out early.
 414          */
 415         if (oops_in_progress)
 416                 return;
 417
 418         /*
 419          * For each CRTC in this fb, turn the connectors on/off.
 420          */
 421         drm_modeset_lock_all(dev);
 422         if (!drm_fb_helper_is_bound(fb_helper)) {
 423                 drm_modeset_unlock_all(dev);
 424                 return;
 425         }
 426
 427         for (i = 0; i < fb_helper->crtc_count; i++) {
 428                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 429
 430                 if (!crtc->enabled)
 431                         continue;
 432
 433                 /* Walk the connectors & encoders on this fb turning them on/off */
 434                 for (j = 0; j < fb_helper->connector_count; j++) {
 435                         connector = fb_helper->connector_info[j]->connector;
 436                         connector->funcs->dpms(connector, dpms_mode);
 437                         drm_object_property_set_value(&connector->base,
 438                                 dev->mode_config.dpms_property, dpms_mode);
 439                 }
 440         }
 441         drm_modeset_unlock_all(dev);
 442 }
 443
 444 /**
 445  * drm_fb_helper_blank - implementation for ->fb_blank
 446  * @blank: desired blanking state
 447  * @info: fbdev registered by the helper
 448  */
 449 int drm_fb_helper_blank(int blank, struct fb_info *info)
 450 {
 451         switch (blank) {
 452         /* Display: On; HSync: On, VSync: On */
 453         case FB_BLANK_UNBLANK:
 454                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 455                 break;
 456         /* Display: Off; HSync: On, VSync: On */
 457         case FB_BLANK_NORMAL:
 458                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 459                 break;
 460         /* Display: Off; HSync: Off, VSync: On */
 461         case FB_BLANK_HSYNC_SUSPEND:
 462                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 463                 break;
 464         /* Display: Off; HSync: On, VSync: Off */
 465         case FB_BLANK_VSYNC_SUSPEND:
 466                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 467                 break;
 468         /* Display: Off; HSync: Off, VSync: Off */
 469         case FB_BLANK_POWERDOWN:
 470                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 471                 break;
 472         }
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(drm_fb_helper_blank);
 476
 477 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 478 {
 479         int i;
 480
 481         for (i = 0; i < helper->connector_count; i++)
 482                 kfree(helper->connector_info[i]);
 483         kfree(helper->connector_info);
 484         for (i = 0; i < helper->crtc_count; i++) {
 485                 kfree(helper->crtc_info[i].mode_set.connectors);
 486                 if (helper->crtc_info[i].mode_set.mode)
 487                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 488         }
 489         kfree(helper->crtc_info);
 490 }
 491
 492 /**
 493  * drm_fb_helper_init - initialize a drm_fb_helper structure
 494  * @dev: drm device
 495  * @fb_helper: driver-allocated fbdev helper structure to initialize
 496  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 497  * @max_conn_count: max connector count
 498  *
 499  * This allocates the structures for the fbdev helper with the given limits.
 500  * Note that this won't yet touch the hardware (through the driver interfaces)
 501  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 502  * to allow driver writes more control over the exact init sequence.
 503  *
 504  * Drivers must set fb_helper->funcs before calling
 505  * drm_fb_helper_initial_config().
 506  *
 507  * RETURNS:
 508  * Zero if everything went ok, nonzero otherwise.
 509  */
 510 int drm_fb_helper_init(struct drm_device *dev,
 511                        struct drm_fb_helper *fb_helper,
 512                        int crtc_count, int max_conn_count)
 513 {
 514         struct drm_crtc *crtc;
 515         int i;
 516
 517         fb_helper->dev = dev;
 518
 519         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 520
 521         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 522         if (!fb_helper->crtc_info)
 523                 return -ENOMEM;
 524
 525         fb_helper->crtc_count = crtc_count;
 526         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 527         if (!fb_helper->connector_info) {
 528                 kfree(fb_helper->crtc_info);
 529                 return -ENOMEM;
 530         }
 531         fb_helper->connector_count = 0;
 532
 533         for (i = 0; i < crtc_count; i++) {
 534                 fb_helper->crtc_info[i].mode_set.connectors =
 535                         kcalloc(max_conn_count,
 536                                 sizeof(struct drm_connector *),
 537                                 GFP_KERNEL);
 538
 539                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 540                         goto out_free;
 541                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 542         }
 543
 544         i = 0;
 545         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 546                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 547                 i++;
 548         }
 549
 550         return 0;
 551 out_free:
 552         drm_fb_helper_crtc_free(fb_helper);
 553         return -ENOMEM;
 554 }
 555 EXPORT_SYMBOL(drm_fb_helper_init);
 556
 557 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 558 {
 559         if (!list_empty(&fb_helper->kernel_fb_list)) {
 560                 list_del(&fb_helper->kernel_fb_list);
 561                 if (list_empty(&kernel_fb_helper_list)) {
 562                         pr_info("drm: unregistered panic notifier\n");
 563                         atomic_notifier_chain_unregister(&panic_notifier_list,
 564                                                          &paniced);
 565                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 566                 }
 567         }
 568
 569         drm_fb_helper_crtc_free(fb_helper);
 570
 571 }
 572 EXPORT_SYMBOL(drm_fb_helper_fini);
 573
 574 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 575                      u16 blue, u16 regno, struct fb_info *info)
 576 {
 577         struct drm_fb_helper *fb_helper = info->par;
 578         struct drm_framebuffer *fb = fb_helper->fb;
 579         int pindex;
 580
 581         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 582                 u32 *palette;
 583                 u32 value;
 584                 /* place color in psuedopalette */
 585                 if (regno > 16)
 586                         return -EINVAL;
 587                 palette = (u32 *)info->pseudo_palette;
 588                 red >>= (16 - info->var.red.length);
 589                 green >>= (16 - info->var.green.length);
 590                 blue >>= (16 - info->var.blue.length);
 591                 value = (red << info->var.red.offset) |
 592                         (green << info->var.green.offset) |
 593                         (blue << info->var.blue.offset);
 594                 if (info->var.transp.length > 0) {
 595                         u32 mask = (1 << info->var.transp.length) - 1;
 596                         mask <<= info->var.transp.offset;
 597                         value |= mask;
 598                 }
 599                 palette[regno] = value;
 600                 return 0;
 601         }
 602
 603         /*
 604          * The driver really shouldn't advertise pseudo/directcolor
 605          * visuals if it can't deal with the palette.
 606          */
 607         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 608                     !fb_helper->funcs->gamma_get))
 609                 return -EINVAL;
 610
 611         pindex = regno;
 612
 613         if (fb->bits_per_pixel == 16) {
 614                 pindex = regno << 3;
 615
 616                 if (fb->depth == 16 && regno > 63)
 617                         return -EINVAL;
 618                 if (fb->depth == 15 && regno > 31)
 619                         return -EINVAL;
 620
 621                 if (fb->depth == 16) {
 622                         u16 r, g, b;
 623                         int i;
 624                         if (regno < 32) {
 625                                 for (i = 0; i < 8; i++)
 626                                         fb_helper->funcs->gamma_set(crtc, red,
 627                                                 green, blue, pindex + i);
 628                         }
 629
 630                         fb_helper->funcs->gamma_get(crtc, &r,
 631                                                     &g, &b,
 632                                                     pindex >> 1);
 633
 634                         for (i = 0; i < 4; i++)
 635                                 fb_helper->funcs->gamma_set(crtc, r,
 636                                                             green, b,
 637                                                             (pindex >> 1) + i);
 638                 }
 639         }
 640
 641         if (fb->depth != 16)
 642                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 643         return 0;
 644 }
 645
 646 /**
 647  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 648  * @cmap: cmap to set
 649  * @info: fbdev registered by the helper
 650  */
 651 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 652 {
 653         struct drm_fb_helper *fb_helper = info->par;
 654         struct drm_device *dev = fb_helper->dev;
 655         struct drm_crtc_helper_funcs *crtc_funcs;
 656         u16 *red, *green, *blue, *transp;
 657         struct drm_crtc *crtc;
 658         int i, j, rc = 0;
 659         int start;
 660
 661         drm_modeset_lock_all(dev);
 662         if (!drm_fb_helper_is_bound(fb_helper)) {
 663                 drm_modeset_unlock_all(dev);
 664                 return -EBUSY;
 665         }
 666
 667         for (i = 0; i < fb_helper->crtc_count; i++) {
 668                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 669                 crtc_funcs = crtc->helper_private;
 670
 671                 red = cmap->red;
 672                 green = cmap->green;
 673                 blue = cmap->blue;
 674                 transp = cmap->transp;
 675                 start = cmap->start;
 676
 677                 for (j = 0; j < cmap->len; j++) {
 678                         u16 hred, hgreen, hblue, htransp = 0xffff;
 679
 680                         hred = *red++;
 681                         hgreen = *green++;
 682                         hblue = *blue++;
 683
 684                         if (transp)
 685                                 htransp = *transp++;
 686
 687                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 688                         if (rc)
 689                                 goto out;
 690                 }
 691                 if (crtc_funcs->load_lut)
 692                         crtc_funcs->load_lut(crtc);
 693         }
 694  out:
 695         drm_modeset_unlock_all(dev);
 696         return rc;
 697 }
 698 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 699
 700 /**
 701  * drm_fb_helper_check_var - implementation for ->fb_check_var
 702  * @var: screeninfo to check
 703  * @info: fbdev registered by the helper
 704  */
 705 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 706                             struct fb_info *info)
 707 {
 708         struct drm_fb_helper *fb_helper = info->par;
 709         struct drm_framebuffer *fb = fb_helper->fb;
 710         int depth;
 711
 712         if (var->pixclock != 0 || in_dbg_master())
 713                 return -EINVAL;
 714
 715         /* Need to resize the fb object !!! */
 716         if (var->bits_per_pixel > fb->bits_per_pixel ||
 717             var->xres > fb->width || var->yres > fb->height ||
 718             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 719                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 720                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 721                           var->xres, var->yres, var->bits_per_pixel,
 722                           var->xres_virtual, var->yres_virtual,
 723                           fb->width, fb->height, fb->bits_per_pixel);
 724                 return -EINVAL;
 725         }
 726
 727         switch (var->bits_per_pixel) {
 728         case 16:
 729                 depth = (var->green.length == 6) ? 16 : 15;
 730                 break;
 731         case 32:
 732                 depth = (var->transp.length > 0) ? 32 : 24;
 733                 break;
 734         default:
 735                 depth = var->bits_per_pixel;
 736                 break;
 737         }
 738
 739         switch (depth) {
 740         case 8:
 741                 var->red.offset = 0;
 742                 var->green.offset = 0;
 743                 var->blue.offset = 0;
 744                 var->red.length = 8;
 745                 var->green.length = 8;
 746                 var->blue.length = 8;
 747                 var->transp.length = 0;
 748                 var->transp.offset = 0;
 749                 break;
 750         case 15:
 751                 var->red.offset = 10;
 752                 var->green.offset = 5;
 753                 var->blue.offset = 0;
 754                 var->red.length = 5;
 755                 var->green.length = 5;
 756                 var->blue.length = 5;
 757                 var->transp.length = 1;
 758                 var->transp.offset = 15;
 759                 break;
 760         case 16:
 761                 var->red.offset = 11;
 762                 var->green.offset = 5;
 763                 var->blue.offset = 0;
 764                 var->red.length = 5;
 765                 var->green.length = 6;
 766                 var->blue.length = 5;
 767                 var->transp.length = 0;
 768                 var->transp.offset = 0;
 769                 break;
 770         case 24:
 771                 var->red.offset = 16;
 772                 var->green.offset = 8;
 773                 var->blue.offset = 0;
 774                 var->red.length = 8;
 775                 var->green.length = 8;
 776                 var->blue.length = 8;
 777                 var->transp.length = 0;
 778                 var->transp.offset = 0;
 779                 break;
 780         case 32:
 781                 var->red.offset = 16;
 782                 var->green.offset = 8;
 783                 var->blue.offset = 0;
 784                 var->red.length = 8;
 785                 var->green.length = 8;
 786                 var->blue.length = 8;
 787                 var->transp.length = 8;
 788                 var->transp.offset = 24;
 789                 break;
 790         default:
 791                 return -EINVAL;
 792         }
 793         return 0;
 794 }
 795 EXPORT_SYMBOL(drm_fb_helper_check_var);
 796
 797 /**
 798  * drm_fb_helper_set_par - implementation for ->fb_set_par
 799  * @info: fbdev registered by the helper
 800  *
 801  * This will let fbcon do the mode init and is called at initialization time by
 802  * the fbdev core when registering the driver, and later on through the hotplug
 803  * callback.
 804  */
 805 int drm_fb_helper_set_par(struct fb_info *info)
 806 {
 807         struct drm_fb_helper *fb_helper = info->par;
 808         struct drm_device *dev = fb_helper->dev;
 809         struct fb_var_screeninfo *var = &info->var;
 810         int ret;
 811         int i;
 812
 813         if (var->pixclock != 0) {
 814                 DRM_ERROR("PIXEL CLOCK SET\n");
 815                 return -EINVAL;
 816         }
 817
 818         drm_modeset_lock_all(dev);
 819         for (i = 0; i < fb_helper->crtc_count; i++) {
 820                 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
 821                 if (ret) {
 822                         drm_modeset_unlock_all(dev);
 823                         return ret;
 824                 }
 825         }
 826         drm_modeset_unlock_all(dev);
 827
 828         if (fb_helper->delayed_hotplug) {
 829                 fb_helper->delayed_hotplug = false;
 830                 drm_fb_helper_hotplug_event(fb_helper);
 831         }
 832         return 0;
 833 }
 834 EXPORT_SYMBOL(drm_fb_helper_set_par);
 835
 836 /**
 837  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 838  * @var: updated screen information
 839  * @info: fbdev registered by the helper
 840  */
 841 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 842                               struct fb_info *info)
 843 {
 844         struct drm_fb_helper *fb_helper = info->par;
 845         struct drm_device *dev = fb_helper->dev;
 846         struct drm_mode_set *modeset;
 847         int ret = 0;
 848         int i;
 849
 850         drm_modeset_lock_all(dev);
 851         if (!drm_fb_helper_is_bound(fb_helper)) {
 852                 drm_modeset_unlock_all(dev);
 853                 return -EBUSY;
 854         }
 855
 856         for (i = 0; i < fb_helper->crtc_count; i++) {
 857                 modeset = &fb_helper->crtc_info[i].mode_set;
 858
 859                 modeset->x = var->xoffset;
 860                 modeset->y = var->yoffset;
 861
 862                 if (modeset->num_connectors) {
 863                         ret = drm_mode_set_config_internal(modeset);
 864                         if (!ret) {
 865                                 info->var.xoffset = var->xoffset;
 866                                 info->var.yoffset = var->yoffset;
 867                         }
 868                 }
 869         }
 870         drm_modeset_unlock_all(dev);
 871         return ret;
 872 }
 873 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 874
 875 /*
 876  * Allocates the backing storage and sets up the fbdev info structure through
 877  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 878  * notifier.
 879  */
 880 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 881                                          int preferred_bpp)
 882 {
 883         int ret = 0;
 884         int crtc_count = 0;
 885         int i;
 886         struct fb_info *info;
 887         struct drm_fb_helper_surface_size sizes;
 888         int gamma_size = 0;
 889
 890         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 891         sizes.surface_depth = 24;
 892         sizes.surface_bpp = 32;
 893         sizes.fb_width = (unsigned)-1;
 894         sizes.fb_height = (unsigned)-1;
 895
 896         /* if driver picks 8 or 16 by default use that
 897            for both depth/bpp */
 898         if (preferred_bpp != sizes.surface_bpp)
 899                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 900
 901         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 902         for (i = 0; i < fb_helper->connector_count; i++) {
 903                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 904                 struct drm_cmdline_mode *cmdline_mode;
 905
 906                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 907
 908                 if (cmdline_mode->bpp_specified) {
 909                         switch (cmdline_mode->bpp) {
 910                         case 8:
 911                                 sizes.surface_depth = sizes.surface_bpp = 8;
 912                                 break;
 913                         case 15:
 914                                 sizes.surface_depth = 15;
 915                                 sizes.surface_bpp = 16;
 916                                 break;
 917                         case 16:
 918                                 sizes.surface_depth = sizes.surface_bpp = 16;
 919                                 break;
 920                         case 24:
 921                                 sizes.surface_depth = sizes.surface_bpp = 24;
 922                                 break;
 923                         case 32:
 924                                 sizes.surface_depth = 24;
 925                                 sizes.surface_bpp = 32;
 926                                 break;
 927                         }
 928                         break;
 929                 }
 930         }
 931
 932         crtc_count = 0;
 933         for (i = 0; i < fb_helper->crtc_count; i++) {
 934                 struct drm_display_mode *desired_mode;
 935                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 936
 937                 if (desired_mode) {
 938                         if (gamma_size == 0)
 939                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 940                         if (desired_mode->hdisplay < sizes.fb_width)
 941                                 sizes.fb_width = desired_mode->hdisplay;
 942                         if (desired_mode->vdisplay < sizes.fb_height)
 943                                 sizes.fb_height = desired_mode->vdisplay;
 944                         if (desired_mode->hdisplay > sizes.surface_width)
 945                                 sizes.surface_width = desired_mode->hdisplay;
 946                         if (desired_mode->vdisplay > sizes.surface_height)
 947                                 sizes.surface_height = desired_mode->vdisplay;
 948                         crtc_count++;
 949                 }
 950         }
 951
 952         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 953                 /* hmm everyone went away - assume VGA cable just fell out
 954                    and will come back later. */
 955                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 956                 sizes.fb_width = sizes.surface_width = 1024;
 957                 sizes.fb_height = sizes.surface_height = 768;
 958         }
 959
 960         /* push down into drivers */
 961         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 962         if (ret < 0)
 963                 return ret;
 964
 965         info = fb_helper->fbdev;
 966
 967         /*
 968          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 969          * events, but at init time drm_setup_crtcs needs to be called before
 970          * the fb is allocated (since we need to figure out the desired size of
 971          * the fb before we can allocate it ...). Hence we need to fix things up
 972          * here again.
 973          */
 974         for (i = 0; i < fb_helper->crtc_count; i++)
 975                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 976                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 977
 978
 979         info->var.pixclock = 0;
 980         if (register_framebuffer(info) < 0)
 981                 return -EINVAL;
 982
 983         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 984                         info->node, info->fix.id);
 985
 986         /* Switch back to kernel console on panic */
 987         /* multi card linked list maybe */
 988         if (list_empty(&kernel_fb_helper_list)) {
 989                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 990                 atomic_notifier_chain_register(&panic_notifier_list,
 991                                                &paniced);
 992                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 993         }
 994
 995         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 996
 997         return 0;
 998 }
 999
1000 /**
1001  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1002  * @info: fbdev registered by the helper
1003  * @pitch: desired pitch
1004  * @depth: desired depth
1005  *
1006  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1007  * fbdev emulations. Drivers which support acceleration methods which impose
1008  * additional constraints need to set up their own limits.
1009  *
1010  * Drivers should call this (or their equivalent setup code) from their
1011  * ->fb_probe callback.
1012  */
1013 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1014                             uint32_t depth)
1015 {
1016         info->fix.type = FB_TYPE_PACKED_PIXELS;
1017         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1018                 FB_VISUAL_TRUECOLOR;
1019         info->fix.mmio_start = 0;
1020         info->fix.mmio_len = 0;
1021         info->fix.type_aux = 0;
1022         info->fix.xpanstep = 1; /* doing it in hw */
1023         info->fix.ypanstep = 1; /* doing it in hw */
1024         info->fix.ywrapstep = 0;
1025         info->fix.accel = FB_ACCEL_NONE;
1026         info->fix.type_aux = 0;
1027
1028         info->fix.line_length = pitch;
1029         return;
1030 }
1031 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1032
1033 /**
1034  * drm_fb_helper_fill_var - initalizes variable fbdev information
1035  * @info: fbdev instance to set up
1036  * @fb_helper: fb helper instance to use as template
1037  * @fb_width: desired fb width
1038  * @fb_height: desired fb height
1039  *
1040  * Sets up the variable fbdev metainformation from the given fb helper instance
1041  * and the drm framebuffer allocated in fb_helper->fb.
1042  *
1043  * Drivers should call this (or their equivalent setup code) from their
1044  * ->fb_probe callback after having allocated the fbdev backing
1045  * storage framebuffer.
1046  */
1047 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1048                             uint32_t fb_width, uint32_t fb_height)
1049 {
1050         struct drm_framebuffer *fb = fb_helper->fb;
1051         info->pseudo_palette = fb_helper->pseudo_palette;
1052         info->var.xres_virtual = fb->width;
1053         info->var.yres_virtual = fb->height;
1054         info->var.bits_per_pixel = fb->bits_per_pixel;
1055         info->var.accel_flags = FB_ACCELF_TEXT;
1056         info->var.xoffset = 0;
1057         info->var.yoffset = 0;
1058         info->var.activate = FB_ACTIVATE_NOW;
1059         info->var.height = -1;
1060         info->var.width = -1;
1061
1062         switch (fb->depth) {
1063         case 8:
1064                 info->var.red.offset = 0;
1065                 info->var.green.offset = 0;
1066                 info->var.blue.offset = 0;
1067                 info->var.red.length = 8; /* 8bit DAC */
1068                 info->var.green.length = 8;
1069                 info->var.blue.length = 8;
1070                 info->var.transp.offset = 0;
1071                 info->var.transp.length = 0;
1072                 break;
1073         case 15:
1074                 info->var.red.offset = 10;
1075                 info->var.green.offset = 5;
1076                 info->var.blue.offset = 0;
1077                 info->var.red.length = 5;
1078                 info->var.green.length = 5;
1079                 info->var.blue.length = 5;
1080                 info->var.transp.offset = 15;
1081                 info->var.transp.length = 1;
1082                 break;
1083         case 16:
1084                 info->var.red.offset = 11;
1085                 info->var.green.offset = 5;
1086                 info->var.blue.offset = 0;
1087                 info->var.red.length = 5;
1088                 info->var.green.length = 6;
1089                 info->var.blue.length = 5;
1090                 info->var.transp.offset = 0;
1091                 break;
1092         case 24:
1093                 info->var.red.offset = 16;
1094                 info->var.green.offset = 8;
1095                 info->var.blue.offset = 0;
1096                 info->var.red.length = 8;
1097                 info->var.green.length = 8;
1098                 info->var.blue.length = 8;
1099                 info->var.transp.offset = 0;
1100                 info->var.transp.length = 0;
1101                 break;
1102         case 32:
1103                 info->var.red.offset = 16;
1104                 info->var.green.offset = 8;
1105                 info->var.blue.offset = 0;
1106                 info->var.red.length = 8;
1107                 info->var.green.length = 8;
1108                 info->var.blue.length = 8;
1109                 info->var.transp.offset = 24;
1110                 info->var.transp.length = 8;
1111                 break;
1112         default:
1113                 break;
1114         }
1115
1116         info->var.xres = fb_width;
1117         info->var.yres = fb_height;
1118 }
1119 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1120
1121 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1122                                                uint32_t maxX,
1123                                                uint32_t maxY)
1124 {
1125         struct drm_connector *connector;
1126         int count = 0;
1127         int i;
1128
1129         for (i = 0; i < fb_helper->connector_count; i++) {
1130                 connector = fb_helper->connector_info[i]->connector;
1131                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1132         }
1133
1134         return count;
1135 }
1136
1137 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1138 {
1139         struct drm_display_mode *mode;
1140
1141         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1142                 if (drm_mode_width(mode) > width ||
1143                     drm_mode_height(mode) > height)
1144                         continue;
1145                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1146                         return mode;
1147         }
1148         return NULL;
1149 }
1150
1151 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1152 {
1153         struct drm_cmdline_mode *cmdline_mode;
1154         cmdline_mode = &fb_connector->cmdline_mode;
1155         return cmdline_mode->specified;
1156 }
1157
1158 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1159                                                       int width, int height)
1160 {
1161         struct drm_cmdline_mode *cmdline_mode;
1162         struct drm_display_mode *mode = NULL;
1163
1164         cmdline_mode = &fb_helper_conn->cmdline_mode;
1165         if (cmdline_mode->specified == false)
1166                 return mode;
1167
1168         /* attempt to find a matching mode in the list of modes
1169          *  we have gotten so far, if not add a CVT mode that conforms
1170          */
1171         if (cmdline_mode->rb || cmdline_mode->margins)
1172                 goto create_mode;
1173
1174         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1175                 /* check width/height */
1176                 if (mode->hdisplay != cmdline_mode->xres ||
1177                     mode->vdisplay != cmdline_mode->yres)
1178                         continue;
1179
1180                 if (cmdline_mode->refresh_specified) {
1181                         if (mode->vrefresh != cmdline_mode->refresh)
1182                                 continue;
1183                 }
1184
1185                 if (cmdline_mode->interlace) {
1186                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1187                                 continue;
1188                 }
1189                 return mode;
1190         }
1191
1192 create_mode:
1193         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1194                                                  cmdline_mode);
1195         list_add(&mode->head, &fb_helper_conn->connector->modes);
1196         return mode;
1197 }
1198
1199 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1200 {
1201         bool enable;
1202
1203         if (strict)
1204                 enable = connector->status == connector_status_connected;
1205         else
1206                 enable = connector->status != connector_status_disconnected;
1207
1208         return enable;
1209 }
1210
1211 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1212                                   bool *enabled)
1213 {
1214         bool any_enabled = false;
1215         struct drm_connector *connector;
1216         int i = 0;
1217
1218         for (i = 0; i < fb_helper->connector_count; i++) {
1219                 connector = fb_helper->connector_info[i]->connector;
1220                 enabled[i] = drm_connector_enabled(connector, true);
1221                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1222                           enabled[i] ? "yes" : "no");
1223                 any_enabled |= enabled[i];
1224         }
1225
1226         if (any_enabled)
1227                 return;
1228
1229         for (i = 0; i < fb_helper->connector_count; i++) {
1230                 connector = fb_helper->connector_info[i]->connector;
1231                 enabled[i] = drm_connector_enabled(connector, false);
1232         }
1233 }
1234
1235 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1236                               struct drm_display_mode **modes,
1237                               bool *enabled, int width, int height)
1238 {
1239         int count, i, j;
1240         bool can_clone = false;
1241         struct drm_fb_helper_connector *fb_helper_conn;
1242         struct drm_display_mode *dmt_mode, *mode;
1243
1244         /* only contemplate cloning in the single crtc case */
1245         if (fb_helper->crtc_count > 1)
1246                 return false;
1247
1248         count = 0;
1249         for (i = 0; i < fb_helper->connector_count; i++) {
1250                 if (enabled[i])
1251                         count++;
1252         }
1253
1254         /* only contemplate cloning if more than one connector is enabled */
1255         if (count <= 1)
1256                 return false;
1257
1258         /* check the command line or if nothing common pick 1024x768 */
1259         can_clone = true;
1260         for (i = 0; i < fb_helper->connector_count; i++) {
1261                 if (!enabled[i])
1262                         continue;
1263                 fb_helper_conn = fb_helper->connector_info[i];
1264                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1265                 if (!modes[i]) {
1266                         can_clone = false;
1267                         break;
1268                 }
1269                 for (j = 0; j < i; j++) {
1270                         if (!enabled[j])
1271                                 continue;
1272                         if (!drm_mode_equal(modes[j], modes[i]))
1273                                 can_clone = false;
1274                 }
1275         }
1276
1277         if (can_clone) {
1278                 DRM_DEBUG_KMS("can clone using command line\n");
1279                 return true;
1280         }
1281
1282         /* try and find a 1024x768 mode on each connector */
1283         can_clone = true;
1284         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1285
1286         for (i = 0; i < fb_helper->connector_count; i++) {
1287
1288                 if (!enabled[i])
1289                         continue;
1290
1291                 fb_helper_conn = fb_helper->connector_info[i];
1292                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1293                         if (drm_mode_equal(mode, dmt_mode))
1294                                 modes[i] = mode;
1295                 }
1296                 if (!modes[i])
1297                         can_clone = false;
1298         }
1299
1300         if (can_clone) {
1301                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1302                 return true;
1303         }
1304         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1305         return false;
1306 }
1307
1308 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1309                                  struct drm_display_mode **modes,
1310                                  bool *enabled, int width, int height)
1311 {
1312         struct drm_fb_helper_connector *fb_helper_conn;
1313         int i;
1314
1315         for (i = 0; i < fb_helper->connector_count; i++) {
1316                 fb_helper_conn = fb_helper->connector_info[i];
1317
1318                 if (enabled[i] == false)
1319                         continue;
1320
1321                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1322                               fb_helper_conn->connector->base.id);
1323
1324                 /* got for command line mode first */
1325                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1326                 if (!modes[i]) {
1327                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1328                                       fb_helper_conn->connector->base.id);
1329                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1330                 }
1331                 /* No preferred modes, pick one off the list */
1332                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1333                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1334                                 break;
1335                 }
1336                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1337                           "none");
1338         }
1339         return true;
1340 }
1341
1342 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1343                           struct drm_fb_helper_crtc **best_crtcs,
1344                           struct drm_display_mode **modes,
1345                           int n, int width, int height)
1346 {
1347         int c, o;
1348         struct drm_device *dev = fb_helper->dev;
1349         struct drm_connector *connector;
1350         struct drm_connector_helper_funcs *connector_funcs;
1351         struct drm_encoder *encoder;
1352         int my_score, best_score, score;
1353         struct drm_fb_helper_crtc **crtcs, *crtc;
1354         struct drm_fb_helper_connector *fb_helper_conn;
1355
1356         if (n == fb_helper->connector_count)
1357                 return 0;
1358
1359         fb_helper_conn = fb_helper->connector_info[n];
1360         connector = fb_helper_conn->connector;
1361
1362         best_crtcs[n] = NULL;
1363         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1364         if (modes[n] == NULL)
1365                 return best_score;
1366
1367         crtcs = kzalloc(dev->mode_config.num_connector *
1368                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1369         if (!crtcs)
1370                 return best_score;
1371
1372         my_score = 1;
1373         if (connector->status == connector_status_connected)
1374                 my_score++;
1375         if (drm_has_cmdline_mode(fb_helper_conn))
1376                 my_score++;
1377         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1378                 my_score++;
1379
1380         connector_funcs = connector->helper_private;
1381         encoder = connector_funcs->best_encoder(connector);
1382         if (!encoder)
1383                 goto out;
1384
1385         /* select a crtc for this connector and then attempt to configure
1386            remaining connectors */
1387         for (c = 0; c < fb_helper->crtc_count; c++) {
1388                 crtc = &fb_helper->crtc_info[c];
1389
1390                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1391                         continue;
1392
1393                 for (o = 0; o < n; o++)
1394                         if (best_crtcs[o] == crtc)
1395                                 break;
1396
1397                 if (o < n) {
1398                         /* ignore cloning unless only a single crtc */
1399                         if (fb_helper->crtc_count > 1)
1400                                 continue;
1401
1402                         if (!drm_mode_equal(modes[o], modes[n]))
1403                                 continue;
1404                 }
1405
1406                 crtcs[n] = crtc;
1407                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1408                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1409                                                   width, height);
1410                 if (score > best_score) {
1411                         best_score = score;
1412                         memcpy(best_crtcs, crtcs,
1413                                dev->mode_config.num_connector *
1414                                sizeof(struct drm_fb_helper_crtc *));
1415                 }
1416         }
1417 out:
1418         kfree(crtcs);
1419         return best_score;
1420 }
1421
1422 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1423 {
1424         struct drm_device *dev = fb_helper->dev;
1425         struct drm_fb_helper_crtc **crtcs;
1426         struct drm_display_mode **modes;
1427         struct drm_mode_set *modeset;
1428         bool *enabled;
1429         int width, height;
1430         int i;
1431
1432         DRM_DEBUG_KMS("\n");
1433
1434         width = dev->mode_config.max_width;
1435         height = dev->mode_config.max_height;
1436
1437         crtcs = kcalloc(dev->mode_config.num_connector,
1438                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1439         modes = kcalloc(dev->mode_config.num_connector,
1440                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1441         enabled = kcalloc(dev->mode_config.num_connector,
1442                           sizeof(bool), GFP_KERNEL);
1443         if (!crtcs || !modes || !enabled) {
1444                 DRM_ERROR("Memory allocation failed\n");
1445                 goto out;
1446         }
1447
1448
1449         drm_enable_connectors(fb_helper, enabled);
1450
1451         if (!(fb_helper->funcs->initial_config &&
1452               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1453                                                enabled, width, height))) {
1454                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1455                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1456
1457                 if (!drm_target_cloned(fb_helper,
1458                                        modes, enabled, width, height) &&
1459                     !drm_target_preferred(fb_helper,
1460                                           modes, enabled, width, height))
1461                         DRM_ERROR("Unable to find initial modes\n");
1462
1463                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1464                               width, height);
1465
1466                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1467         }
1468
1469         /* need to set the modesets up here for use later */
1470         /* fill out the connector<->crtc mappings into the modesets */
1471         for (i = 0; i < fb_helper->crtc_count; i++) {
1472                 modeset = &fb_helper->crtc_info[i].mode_set;
1473                 modeset->num_connectors = 0;
1474                 modeset->fb = NULL;
1475         }
1476
1477         for (i = 0; i < fb_helper->connector_count; i++) {
1478                 struct drm_display_mode *mode = modes[i];
1479                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1480                 modeset = &fb_crtc->mode_set;
1481
1482                 if (mode && fb_crtc) {
1483                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1484                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1485                         fb_crtc->desired_mode = mode;
1486                         if (modeset->mode)
1487                                 drm_mode_destroy(dev, modeset->mode);
1488                         modeset->mode = drm_mode_duplicate(dev,
1489                                                            fb_crtc->desired_mode);
1490                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1491                         modeset->fb = fb_helper->fb;
1492                 }
1493         }
1494
1495         /* Clear out any old modes if there are no more connected outputs. */
1496         for (i = 0; i < fb_helper->crtc_count; i++) {
1497                 modeset = &fb_helper->crtc_info[i].mode_set;
1498                 if (modeset->num_connectors == 0) {
1499                         BUG_ON(modeset->fb);
1500                         BUG_ON(modeset->num_connectors);
1501                         if (modeset->mode)
1502                                 drm_mode_destroy(dev, modeset->mode);
1503                         modeset->mode = NULL;
1504                 }
1505         }
1506 out:
1507         kfree(crtcs);
1508         kfree(modes);
1509         kfree(enabled);
1510 }
1511
1512 /**
1513  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1514  * @fb_helper: fb_helper device struct
1515  * @bpp_sel: bpp value to use for the framebuffer configuration
1516  *
1517  * Scans the CRTCs and connectors and tries to put together an initial setup.
1518  * At the moment, this is a cloned configuration across all heads with
1519  * a new framebuffer object as the backing store.
1520  *
1521  * Note that this also registers the fbdev and so allows userspace to call into
1522  * the driver through the fbdev interfaces.
1523  *
1524  * This function will call down into the ->fb_probe callback to let
1525  * the driver allocate and initialize the fbdev info structure and the drm
1526  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1527  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1528  * values for the fbdev info structure.
1529  *
1530  * RETURNS:
1531  * Zero if everything went ok, nonzero otherwise.
1532  */
1533 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1534 {
1535         struct drm_device *dev = fb_helper->dev;
1536         int count = 0;
1537
1538         drm_fb_helper_parse_command_line(fb_helper);
1539
1540         count = drm_fb_helper_probe_connector_modes(fb_helper,
1541                                                     dev->mode_config.max_width,
1542                                                     dev->mode_config.max_height);
1543         /*
1544          * we shouldn't end up with no modes here.
1545          */
1546         if (count == 0)
1547                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1548
1549         drm_setup_crtcs(fb_helper);
1550
1551         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1552 }
1553 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1554
1555 /**
1556  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1557  *                               probing all the outputs attached to the fb
1558  * @fb_helper: the drm_fb_helper
1559  *
1560  * Scan the connectors attached to the fb_helper and try to put together a
1561  * setup after *notification of a change in output configuration.
1562  *
1563  * Called at runtime, takes the mode config locks to be able to check/change the
1564  * modeset configuration. Must be run from process context (which usually means
1565  * either the output polling work or a work item launched from the driver's
1566  * hotplug interrupt).
1567  *
1568  * Note that the driver must ensure that this is only called _after_ the fb has
1569  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1570  *
1571  * RETURNS:
1572  * 0 on success and a non-zero error code otherwise.
1573  */
1574 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1575 {
1576         struct drm_device *dev = fb_helper->dev;
1577         u32 max_width, max_height;
1578
1579         if (!fb_helper->fb)
1580                 return 0;
1581
1582         mutex_lock(&fb_helper->dev->mode_config.mutex);
1583         if (!drm_fb_helper_is_bound(fb_helper)) {
1584                 fb_helper->delayed_hotplug = true;
1585                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1586                 return 0;
1587         }
1588         DRM_DEBUG_KMS("\n");
1589
1590         max_width = fb_helper->fb->width;
1591         max_height = fb_helper->fb->height;
1592
1593         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1594         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1595
1596         drm_modeset_lock_all(dev);
1597         drm_setup_crtcs(fb_helper);
1598         drm_modeset_unlock_all(dev);
1599         drm_fb_helper_set_par(fb_helper->fbdev);
1600
1601         return 0;
1602 }
1603 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1604
1605 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1606  * but the module doesn't depend on any fb console symbols.  At least
1607  * attempt to load fbcon to avoid leaving the system without a usable console.
1608  */
1609 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1610 static int __init drm_fb_helper_modinit(void)
1611 {
1612         const char *name = "fbcon";
1613         struct module *fbcon;
1614
1615         mutex_lock(&module_mutex);
1616         fbcon = find_module(name);
1617         mutex_unlock(&module_mutex);
1618
1619         if (!fbcon)
1620                 request_module_nowait(name);
1621         return 0;
1622 }
1623
1624 module_init(drm_fb_helper_modinit);
1625 #endif