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