drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/kernel.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/slab.h>
  35 #include <linux/fb.h>
  36 #include <linux/module.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_crtc_helper.h>
  41
  42 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 /**
  45  * DOC: fbdev helpers
  46  *
  47  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  48  * mode setting driver. They can be used mostly independently from the crtc
  49  * helper functions used by many drivers to implement the kernel mode setting
  50  * interfaces.
  51  *
  52  * Initialization is done as a three-step process with drm_fb_helper_init(),
  53  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  54  * Drivers with fancier requirements than the default behaviour can override the
  55  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  56  *
  57  * At runtime drivers should restore the fbdev console by calling
  58  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  59  * should also notify the fb helper code from updates to the output
  60  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  61  * integration with the output polling code in drm_crtc_helper.c the modeset
  62  * code provides a ->output_poll_changed callback.
  63  *
  64  * All other functions exported by the fb helper library can be used to
  65  * implement the fbdev driver interface by the driver.
  66  */
  67
  68 /**
  69  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  70  *                                             emulation helper
  71  * @fb_helper: fbdev initialized with drm_fb_helper_init
  72  *
  73  * This functions adds all the available connectors for use with the given
  74  * fb_helper. This is a separate step to allow drivers to freely assign
  75  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  76  * not adequate to be used for the fbcon.
  77  *
  78  * Since this is part of the initial setup before the fbdev is published, no
  79  * locking is required.
  80  */
  81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  82 {
  83         struct drm_device *dev = fb_helper->dev;
  84         struct drm_connector *connector;
  85         int i;
  86
  87         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  88                 struct drm_fb_helper_connector *fb_helper_connector;
  89
  90                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  91                 if (!fb_helper_connector)
  92                         goto fail;
  93
  94                 fb_helper_connector->connector = connector;
  95                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  96         }
  97         return 0;
  98 fail:
  99         for (i = 0; i < fb_helper->connector_count; i++) {
 100                 kfree(fb_helper->connector_info[i]);
 101                 fb_helper->connector_info[i] = NULL;
 102         }
 103         fb_helper->connector_count = 0;
 104         return -ENOMEM;
 105 }
 106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 107
 108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 109 {
 110         struct drm_fb_helper_connector *fb_helper_conn;
 111         int i;
 112
 113         for (i = 0; i < fb_helper->connector_count; i++) {
 114                 struct drm_cmdline_mode *mode;
 115                 struct drm_connector *connector;
 116                 char *option = NULL;
 117
 118                 fb_helper_conn = fb_helper->connector_info[i];
 119                 connector = fb_helper_conn->connector;
 120                 mode = &fb_helper_conn->cmdline_mode;
 121
 122                 /* do something on return - turn off connector maybe */
 123                 if (fb_get_options(connector->name, &option))
 124                         continue;
 125
 126                 if (drm_mode_parse_command_line_for_connector(option,
 127                                                               connector,
 128                                                               mode)) {
 129                         if (mode->force) {
 130                                 const char *s;
 131                                 switch (mode->force) {
 132                                 case DRM_FORCE_OFF:
 133                                         s = "OFF";
 134                                         break;
 135                                 case DRM_FORCE_ON_DIGITAL:
 136                                         s = "ON - dig";
 137                                         break;
 138                                 default:
 139                                 case DRM_FORCE_ON:
 140                                         s = "ON";
 141                                         break;
 142                                 }
 143
 144                                 DRM_INFO("forcing %s connector %s\n",
 145                                          connector->name, s);
 146                                 connector->force = mode->force;
 147                         }
 148
 149                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 150                                       connector->name,
 151                                       mode->xres, mode->yres,
 152                                       mode->refresh_specified ? mode->refresh : 60,
 153                                       mode->rb ? " reduced blanking" : "",
 154                                       mode->margins ? " with margins" : "",
 155                                       mode->interlace ?  " interlaced" : "");
 156                 }
 157
 158         }
 159         return 0;
 160 }
 161
 162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 163 {
 164         uint16_t *r_base, *g_base, *b_base;
 165         int i;
 166
 167         if (helper->funcs->gamma_get == NULL)
 168                 return;
 169
 170         r_base = crtc->gamma_store;
 171         g_base = r_base + crtc->gamma_size;
 172         b_base = g_base + crtc->gamma_size;
 173
 174         for (i = 0; i < crtc->gamma_size; i++)
 175                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 176 }
 177
 178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 179 {
 180         uint16_t *r_base, *g_base, *b_base;
 181
 182         if (crtc->funcs->gamma_set == NULL)
 183                 return;
 184
 185         r_base = crtc->gamma_store;
 186         g_base = r_base + crtc->gamma_size;
 187         b_base = g_base + crtc->gamma_size;
 188
 189         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 190 }
 191
 192 /**
 193  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 194  * @info: fbdev registered by the helper
 195  */
 196 int drm_fb_helper_debug_enter(struct fb_info *info)
 197 {
 198         struct drm_fb_helper *helper = info->par;
 199         struct drm_crtc_helper_funcs *funcs;
 200         int i;
 201
 202         if (list_empty(&kernel_fb_helper_list))
 203                 return false;
 204
 205         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 206                 for (i = 0; i < helper->crtc_count; i++) {
 207                         struct drm_mode_set *mode_set =
 208                                 &helper->crtc_info[i].mode_set;
 209
 210                         if (!mode_set->crtc->enabled)
 211                                 continue;
 212
 213                         funcs = mode_set->crtc->helper_private;
 214                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 215                         funcs->mode_set_base_atomic(mode_set->crtc,
 216                                                     mode_set->fb,
 217                                                     mode_set->x,
 218                                                     mode_set->y,
 219                                                     ENTER_ATOMIC_MODE_SET);
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 226
 227 /* Find the real fb for a given fb helper CRTC */
 228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 229 {
 230         struct drm_device *dev = crtc->dev;
 231         struct drm_crtc *c;
 232
 233         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 234                 if (crtc->base.id == c->base.id)
 235                         return c->primary->fb;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 /**
 242  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 243  * @info: fbdev registered by the helper
 244  */
 245 int drm_fb_helper_debug_leave(struct fb_info *info)
 246 {
 247         struct drm_fb_helper *helper = info->par;
 248         struct drm_crtc *crtc;
 249         struct drm_crtc_helper_funcs *funcs;
 250         struct drm_framebuffer *fb;
 251         int i;
 252
 253         for (i = 0; i < helper->crtc_count; i++) {
 254                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 255                 crtc = mode_set->crtc;
 256                 funcs = crtc->helper_private;
 257                 fb = drm_mode_config_fb(crtc);
 258
 259                 if (!crtc->enabled)
 260                         continue;
 261
 262                 if (!fb) {
 263                         DRM_ERROR("no fb to restore??\n");
 264                         continue;
 265                 }
 266
 267                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 268                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 269                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 270         }
 271
 272         return 0;
 273 }
 274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 275
 276 /**
 277  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 278  * @fb_helper: fbcon to restore
 279  *
 280  * This should be called from driver's drm ->lastclose callback
 281  * when implementing an fbcon on top of kms using this helper. This ensures that
 282  * the user isn't greeted with a black screen when e.g. X dies.
 283  */
 284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 285 {
 286         struct drm_device *dev = fb_helper->dev;
 287         struct drm_plane *plane;
 288         bool error = false;
 289         int i;
 290
 291         drm_warn_on_modeset_not_all_locked(dev);
 292
 293         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 294                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 295                         drm_plane_force_disable(plane);
 296
 297         for (i = 0; i < fb_helper->crtc_count; i++) {
 298                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 299                 struct drm_crtc *crtc = mode_set->crtc;
 300                 int ret;
 301
 302                 if (crtc->funcs->cursor_set) {
 303                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 304                         if (ret)
 305                                 error = true;
 306                 }
 307
 308                 ret = drm_mode_set_config_internal(mode_set);
 309                 if (ret)
 310                         error = true;
 311         }
 312         return error;
 313 }
 314 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 315
 316 /*
 317  * restore fbcon display for all kms driver's using this helper, used for sysrq
 318  * and panic handling.
 319  */
 320 static bool drm_fb_helper_force_kernel_mode(void)
 321 {
 322         bool ret, error = false;
 323         struct drm_fb_helper *helper;
 324
 325         if (list_empty(&kernel_fb_helper_list))
 326                 return false;
 327
 328         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 329                 struct drm_device *dev = helper->dev;
 330
 331                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 332                         continue;
 333
 334                 /* NOTE: we use lockless flag below to avoid grabbing other
 335                  * modeset locks.  So just trylock the underlying mutex
 336                  * directly:
 337                  */
 338                 if (!mutex_trylock(&dev->mode_config.mutex)) {
 339                         error = true;
 340                         continue;
 341                 }
 342
 343                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 344                 if (ret)
 345                         error = true;
 346
 347                 mutex_unlock(&dev->mode_config.mutex);
 348         }
 349         return error;
 350 }
 351
 352 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 353                         void *panic_str)
 354 {
 355         /*
 356          * It's a waste of time and effort to switch back to text console
 357          * if the kernel should reboot before panic messages can be seen.
 358          */
 359         if (panic_timeout < 0)
 360                 return 0;
 361
 362         pr_err("panic occurred, switching back to text console\n");
 363         return drm_fb_helper_force_kernel_mode();
 364 }
 365
 366 static struct notifier_block paniced = {
 367         .notifier_call = drm_fb_helper_panic,
 368 };
 369
 370 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 371 {
 372         struct drm_device *dev = fb_helper->dev;
 373         struct drm_crtc *crtc;
 374         int bound = 0, crtcs_bound = 0;
 375
 376         /* Sometimes user space wants everything disabled, so don't steal the
 377          * display if there's a master. */
 378         if (dev->primary->master)
 379                 return false;
 380
 381         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 382                 if (crtc->primary->fb)
 383                         crtcs_bound++;
 384                 if (crtc->primary->fb == fb_helper->fb)
 385                         bound++;
 386         }
 387
 388         if (bound < crtcs_bound)
 389                 return false;
 390
 391         return true;
 392 }
 393
 394 #ifdef CONFIG_MAGIC_SYSRQ
 395 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 396 {
 397         bool ret;
 398         ret = drm_fb_helper_force_kernel_mode();
 399         if (ret == true)
 400                 DRM_ERROR("Failed to restore crtc configuration\n");
 401 }
 402 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 403
 404 static void drm_fb_helper_sysrq(int dummy1)
 405 {
 406         schedule_work(&drm_fb_helper_restore_work);
 407 }
 408
 409 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 410         .handler = drm_fb_helper_sysrq,
 411         .help_msg = "force-fb(V)",
 412         .action_msg = "Restore framebuffer console",
 413 };
 414 #else
 415 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 416 #endif
 417
 418 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 419 {
 420         struct drm_fb_helper *fb_helper = info->par;
 421         struct drm_device *dev = fb_helper->dev;
 422         struct drm_crtc *crtc;
 423         struct drm_connector *connector;
 424         int i, j;
 425
 426         /*
 427          * fbdev->blank can be called from irq context in case of a panic.
 428          * Since we already have our own special panic handler which will
 429          * restore the fbdev console mode completely, just bail out early.
 430          */
 431         if (oops_in_progress)
 432                 return;
 433
 434         /*
 435          * For each CRTC in this fb, turn the connectors on/off.
 436          */
 437         drm_modeset_lock_all(dev);
 438         if (!drm_fb_helper_is_bound(fb_helper)) {
 439                 drm_modeset_unlock_all(dev);
 440                 return;
 441         }
 442
 443         for (i = 0; i < fb_helper->crtc_count; i++) {
 444                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 445
 446                 if (!crtc->enabled)
 447                         continue;
 448
 449                 /* Walk the connectors & encoders on this fb turning them on/off */
 450                 for (j = 0; j < fb_helper->connector_count; j++) {
 451                         connector = fb_helper->connector_info[j]->connector;
 452                         connector->funcs->dpms(connector, dpms_mode);
 453                         drm_object_property_set_value(&connector->base,
 454                                 dev->mode_config.dpms_property, dpms_mode);
 455                 }
 456         }
 457         drm_modeset_unlock_all(dev);
 458 }
 459
 460 /**
 461  * drm_fb_helper_blank - implementation for ->fb_blank
 462  * @blank: desired blanking state
 463  * @info: fbdev registered by the helper
 464  */
 465 int drm_fb_helper_blank(int blank, struct fb_info *info)
 466 {
 467         switch (blank) {
 468         /* Display: On; HSync: On, VSync: On */
 469         case FB_BLANK_UNBLANK:
 470                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 471                 break;
 472         /* Display: Off; HSync: On, VSync: On */
 473         case FB_BLANK_NORMAL:
 474                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 475                 break;
 476         /* Display: Off; HSync: Off, VSync: On */
 477         case FB_BLANK_HSYNC_SUSPEND:
 478                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 479                 break;
 480         /* Display: Off; HSync: On, VSync: Off */
 481         case FB_BLANK_VSYNC_SUSPEND:
 482                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 483                 break;
 484         /* Display: Off; HSync: Off, VSync: Off */
 485         case FB_BLANK_POWERDOWN:
 486                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 487                 break;
 488         }
 489         return 0;
 490 }
 491 EXPORT_SYMBOL(drm_fb_helper_blank);
 492
 493 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 494 {
 495         int i;
 496
 497         for (i = 0; i < helper->connector_count; i++)
 498                 kfree(helper->connector_info[i]);
 499         kfree(helper->connector_info);
 500         for (i = 0; i < helper->crtc_count; i++) {
 501                 kfree(helper->crtc_info[i].mode_set.connectors);
 502                 if (helper->crtc_info[i].mode_set.mode)
 503                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 504         }
 505         kfree(helper->crtc_info);
 506 }
 507
 508 /**
 509  * drm_fb_helper_init - initialize a drm_fb_helper structure
 510  * @dev: drm device
 511  * @fb_helper: driver-allocated fbdev helper structure to initialize
 512  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 513  * @max_conn_count: max connector count
 514  *
 515  * This allocates the structures for the fbdev helper with the given limits.
 516  * Note that this won't yet touch the hardware (through the driver interfaces)
 517  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 518  * to allow driver writes more control over the exact init sequence.
 519  *
 520  * Drivers must set fb_helper->funcs before calling
 521  * drm_fb_helper_initial_config().
 522  *
 523  * RETURNS:
 524  * Zero if everything went ok, nonzero otherwise.
 525  */
 526 int drm_fb_helper_init(struct drm_device *dev,
 527                        struct drm_fb_helper *fb_helper,
 528                        int crtc_count, int max_conn_count)
 529 {
 530         struct drm_crtc *crtc;
 531         int i;
 532
 533         if (!max_conn_count)
 534                 return -EINVAL;
 535
 536         fb_helper->dev = dev;
 537
 538         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 539
 540         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 541         if (!fb_helper->crtc_info)
 542                 return -ENOMEM;
 543
 544         fb_helper->crtc_count = crtc_count;
 545         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 546         if (!fb_helper->connector_info) {
 547                 kfree(fb_helper->crtc_info);
 548                 return -ENOMEM;
 549         }
 550         fb_helper->connector_count = 0;
 551
 552         for (i = 0; i < crtc_count; i++) {
 553                 fb_helper->crtc_info[i].mode_set.connectors =
 554                         kcalloc(max_conn_count,
 555                                 sizeof(struct drm_connector *),
 556                                 GFP_KERNEL);
 557
 558                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 559                         goto out_free;
 560                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 561         }
 562
 563         i = 0;
 564         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 565                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 566                 i++;
 567         }
 568
 569         return 0;
 570 out_free:
 571         drm_fb_helper_crtc_free(fb_helper);
 572         return -ENOMEM;
 573 }
 574 EXPORT_SYMBOL(drm_fb_helper_init);
 575
 576 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 577 {
 578         if (!list_empty(&fb_helper->kernel_fb_list)) {
 579                 list_del(&fb_helper->kernel_fb_list);
 580                 if (list_empty(&kernel_fb_helper_list)) {
 581                         pr_info("drm: unregistered panic notifier\n");
 582                         atomic_notifier_chain_unregister(&panic_notifier_list,
 583                                                          &paniced);
 584                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 585                 }
 586         }
 587
 588         drm_fb_helper_crtc_free(fb_helper);
 589
 590 }
 591 EXPORT_SYMBOL(drm_fb_helper_fini);
 592
 593 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 594                      u16 blue, u16 regno, struct fb_info *info)
 595 {
 596         struct drm_fb_helper *fb_helper = info->par;
 597         struct drm_framebuffer *fb = fb_helper->fb;
 598         int pindex;
 599
 600         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 601                 u32 *palette;
 602                 u32 value;
 603                 /* place color in psuedopalette */
 604                 if (regno > 16)
 605                         return -EINVAL;
 606                 palette = (u32 *)info->pseudo_palette;
 607                 red >>= (16 - info->var.red.length);
 608                 green >>= (16 - info->var.green.length);
 609                 blue >>= (16 - info->var.blue.length);
 610                 value = (red << info->var.red.offset) |
 611                         (green << info->var.green.offset) |
 612                         (blue << info->var.blue.offset);
 613                 if (info->var.transp.length > 0) {
 614                         u32 mask = (1 << info->var.transp.length) - 1;
 615                         mask <<= info->var.transp.offset;
 616                         value |= mask;
 617                 }
 618                 palette[regno] = value;
 619                 return 0;
 620         }
 621
 622         /*
 623          * The driver really shouldn't advertise pseudo/directcolor
 624          * visuals if it can't deal with the palette.
 625          */
 626         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 627                     !fb_helper->funcs->gamma_get))
 628                 return -EINVAL;
 629
 630         pindex = regno;
 631
 632         if (fb->bits_per_pixel == 16) {
 633                 pindex = regno << 3;
 634
 635                 if (fb->depth == 16 && regno > 63)
 636                         return -EINVAL;
 637                 if (fb->depth == 15 && regno > 31)
 638                         return -EINVAL;
 639
 640                 if (fb->depth == 16) {
 641                         u16 r, g, b;
 642                         int i;
 643                         if (regno < 32) {
 644                                 for (i = 0; i < 8; i++)
 645                                         fb_helper->funcs->gamma_set(crtc, red,
 646                                                 green, blue, pindex + i);
 647                         }
 648
 649                         fb_helper->funcs->gamma_get(crtc, &r,
 650                                                     &g, &b,
 651                                                     pindex >> 1);
 652
 653                         for (i = 0; i < 4; i++)
 654                                 fb_helper->funcs->gamma_set(crtc, r,
 655                                                             green, b,
 656                                                             (pindex >> 1) + i);
 657                 }
 658         }
 659
 660         if (fb->depth != 16)
 661                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 662         return 0;
 663 }
 664
 665 /**
 666  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 667  * @cmap: cmap to set
 668  * @info: fbdev registered by the helper
 669  */
 670 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 671 {
 672         struct drm_fb_helper *fb_helper = info->par;
 673         struct drm_device *dev = fb_helper->dev;
 674         struct drm_crtc_helper_funcs *crtc_funcs;
 675         u16 *red, *green, *blue, *transp;
 676         struct drm_crtc *crtc;
 677         int i, j, rc = 0;
 678         int start;
 679
 680         drm_modeset_lock_all(dev);
 681         if (!drm_fb_helper_is_bound(fb_helper)) {
 682                 drm_modeset_unlock_all(dev);
 683                 return -EBUSY;
 684         }
 685
 686         for (i = 0; i < fb_helper->crtc_count; i++) {
 687                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 688                 crtc_funcs = crtc->helper_private;
 689
 690                 red = cmap->red;
 691                 green = cmap->green;
 692                 blue = cmap->blue;
 693                 transp = cmap->transp;
 694                 start = cmap->start;
 695
 696                 for (j = 0; j < cmap->len; j++) {
 697                         u16 hred, hgreen, hblue, htransp = 0xffff;
 698
 699                         hred = *red++;
 700                         hgreen = *green++;
 701                         hblue = *blue++;
 702
 703                         if (transp)
 704                                 htransp = *transp++;
 705
 706                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 707                         if (rc)
 708                                 goto out;
 709                 }
 710                 if (crtc_funcs->load_lut)
 711                         crtc_funcs->load_lut(crtc);
 712         }
 713  out:
 714         drm_modeset_unlock_all(dev);
 715         return rc;
 716 }
 717 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 718
 719 /**
 720  * drm_fb_helper_check_var - implementation for ->fb_check_var
 721  * @var: screeninfo to check
 722  * @info: fbdev registered by the helper
 723  */
 724 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 725                             struct fb_info *info)
 726 {
 727         struct drm_fb_helper *fb_helper = info->par;
 728         struct drm_framebuffer *fb = fb_helper->fb;
 729         int depth;
 730
 731         if (var->pixclock != 0 || in_dbg_master())
 732                 return -EINVAL;
 733
 734         /* Need to resize the fb object !!! */
 735         if (var->bits_per_pixel > fb->bits_per_pixel ||
 736             var->xres > fb->width || var->yres > fb->height ||
 737             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 738                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 739                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 740                           var->xres, var->yres, var->bits_per_pixel,
 741                           var->xres_virtual, var->yres_virtual,
 742                           fb->width, fb->height, fb->bits_per_pixel);
 743                 return -EINVAL;
 744         }
 745
 746         switch (var->bits_per_pixel) {
 747         case 16:
 748                 depth = (var->green.length == 6) ? 16 : 15;
 749                 break;
 750         case 32:
 751                 depth = (var->transp.length > 0) ? 32 : 24;
 752                 break;
 753         default:
 754                 depth = var->bits_per_pixel;
 755                 break;
 756         }
 757
 758         switch (depth) {
 759         case 8:
 760                 var->red.offset = 0;
 761                 var->green.offset = 0;
 762                 var->blue.offset = 0;
 763                 var->red.length = 8;
 764                 var->green.length = 8;
 765                 var->blue.length = 8;
 766                 var->transp.length = 0;
 767                 var->transp.offset = 0;
 768                 break;
 769         case 15:
 770                 var->red.offset = 10;
 771                 var->green.offset = 5;
 772                 var->blue.offset = 0;
 773                 var->red.length = 5;
 774                 var->green.length = 5;
 775                 var->blue.length = 5;
 776                 var->transp.length = 1;
 777                 var->transp.offset = 15;
 778                 break;
 779         case 16:
 780                 var->red.offset = 11;
 781                 var->green.offset = 5;
 782                 var->blue.offset = 0;
 783                 var->red.length = 5;
 784                 var->green.length = 6;
 785                 var->blue.length = 5;
 786                 var->transp.length = 0;
 787                 var->transp.offset = 0;
 788                 break;
 789         case 24:
 790                 var->red.offset = 16;
 791                 var->green.offset = 8;
 792                 var->blue.offset = 0;
 793                 var->red.length = 8;
 794                 var->green.length = 8;
 795                 var->blue.length = 8;
 796                 var->transp.length = 0;
 797                 var->transp.offset = 0;
 798                 break;
 799         case 32:
 800                 var->red.offset = 16;
 801                 var->green.offset = 8;
 802                 var->blue.offset = 0;
 803                 var->red.length = 8;
 804                 var->green.length = 8;
 805                 var->blue.length = 8;
 806                 var->transp.length = 8;
 807                 var->transp.offset = 24;
 808                 break;
 809         default:
 810                 return -EINVAL;
 811         }
 812         return 0;
 813 }
 814 EXPORT_SYMBOL(drm_fb_helper_check_var);
 815
 816 /**
 817  * drm_fb_helper_set_par - implementation for ->fb_set_par
 818  * @info: fbdev registered by the helper
 819  *
 820  * This will let fbcon do the mode init and is called at initialization time by
 821  * the fbdev core when registering the driver, and later on through the hotplug
 822  * callback.
 823  */
 824 int drm_fb_helper_set_par(struct fb_info *info)
 825 {
 826         struct drm_fb_helper *fb_helper = info->par;
 827         struct drm_device *dev = fb_helper->dev;
 828         struct fb_var_screeninfo *var = &info->var;
 829
 830         if (var->pixclock != 0) {
 831                 DRM_ERROR("PIXEL CLOCK SET\n");
 832                 return -EINVAL;
 833         }
 834
 835         drm_modeset_lock_all(dev);
 836         drm_fb_helper_restore_fbdev_mode(fb_helper);
 837         drm_modeset_unlock_all(dev);
 838
 839         if (fb_helper->delayed_hotplug) {
 840                 fb_helper->delayed_hotplug = false;
 841                 drm_fb_helper_hotplug_event(fb_helper);
 842         }
 843         return 0;
 844 }
 845 EXPORT_SYMBOL(drm_fb_helper_set_par);
 846
 847 /**
 848  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 849  * @var: updated screen information
 850  * @info: fbdev registered by the helper
 851  */
 852 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 853                               struct fb_info *info)
 854 {
 855         struct drm_fb_helper *fb_helper = info->par;
 856         struct drm_device *dev = fb_helper->dev;
 857         struct drm_mode_set *modeset;
 858         int ret = 0;
 859         int i;
 860
 861         drm_modeset_lock_all(dev);
 862         if (!drm_fb_helper_is_bound(fb_helper)) {
 863                 drm_modeset_unlock_all(dev);
 864                 return -EBUSY;
 865         }
 866
 867         for (i = 0; i < fb_helper->crtc_count; i++) {
 868                 modeset = &fb_helper->crtc_info[i].mode_set;
 869
 870                 modeset->x = var->xoffset;
 871                 modeset->y = var->yoffset;
 872
 873                 if (modeset->num_connectors) {
 874                         ret = drm_mode_set_config_internal(modeset);
 875                         if (!ret) {
 876                                 info->var.xoffset = var->xoffset;
 877                                 info->var.yoffset = var->yoffset;
 878                         }
 879                 }
 880         }
 881         drm_modeset_unlock_all(dev);
 882         return ret;
 883 }
 884 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 885
 886 /*
 887  * Allocates the backing storage and sets up the fbdev info structure through
 888  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 889  * notifier.
 890  */
 891 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 892                                          int preferred_bpp)
 893 {
 894         int ret = 0;
 895         int crtc_count = 0;
 896         int i;
 897         struct fb_info *info;
 898         struct drm_fb_helper_surface_size sizes;
 899         int gamma_size = 0;
 900
 901         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 902         sizes.surface_depth = 24;
 903         sizes.surface_bpp = 32;
 904         sizes.fb_width = (unsigned)-1;
 905         sizes.fb_height = (unsigned)-1;
 906
 907         /* if driver picks 8 or 16 by default use that
 908            for both depth/bpp */
 909         if (preferred_bpp != sizes.surface_bpp)
 910                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 911
 912         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 913         for (i = 0; i < fb_helper->connector_count; i++) {
 914                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 915                 struct drm_cmdline_mode *cmdline_mode;
 916
 917                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 918
 919                 if (cmdline_mode->bpp_specified) {
 920                         switch (cmdline_mode->bpp) {
 921                         case 8:
 922                                 sizes.surface_depth = sizes.surface_bpp = 8;
 923                                 break;
 924                         case 15:
 925                                 sizes.surface_depth = 15;
 926                                 sizes.surface_bpp = 16;
 927                                 break;
 928                         case 16:
 929                                 sizes.surface_depth = sizes.surface_bpp = 16;
 930                                 break;
 931                         case 24:
 932                                 sizes.surface_depth = sizes.surface_bpp = 24;
 933                                 break;
 934                         case 32:
 935                                 sizes.surface_depth = 24;
 936                                 sizes.surface_bpp = 32;
 937                                 break;
 938                         }
 939                         break;
 940                 }
 941         }
 942
 943         crtc_count = 0;
 944         for (i = 0; i < fb_helper->crtc_count; i++) {
 945                 struct drm_display_mode *desired_mode;
 946                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 947
 948                 if (desired_mode) {
 949                         if (gamma_size == 0)
 950                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 951                         if (desired_mode->hdisplay < sizes.fb_width)
 952                                 sizes.fb_width = desired_mode->hdisplay;
 953                         if (desired_mode->vdisplay < sizes.fb_height)
 954                                 sizes.fb_height = desired_mode->vdisplay;
 955                         if (desired_mode->hdisplay > sizes.surface_width)
 956                                 sizes.surface_width = desired_mode->hdisplay;
 957                         if (desired_mode->vdisplay > sizes.surface_height)
 958                                 sizes.surface_height = desired_mode->vdisplay;
 959                         crtc_count++;
 960                 }
 961         }
 962
 963         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 964                 /* hmm everyone went away - assume VGA cable just fell out
 965                    and will come back later. */
 966                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 967                 sizes.fb_width = sizes.surface_width = 1024;
 968                 sizes.fb_height = sizes.surface_height = 768;
 969         }
 970
 971         /* push down into drivers */
 972         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 973         if (ret < 0)
 974                 return ret;
 975
 976         info = fb_helper->fbdev;
 977
 978         /*
 979          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 980          * events, but at init time drm_setup_crtcs needs to be called before
 981          * the fb is allocated (since we need to figure out the desired size of
 982          * the fb before we can allocate it ...). Hence we need to fix things up
 983          * here again.
 984          */
 985         for (i = 0; i < fb_helper->crtc_count; i++)
 986                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 987                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 988
 989
 990         info->var.pixclock = 0;
 991         if (register_framebuffer(info) < 0)
 992                 return -EINVAL;
 993
 994         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 995                         info->node, info->fix.id);
 996
 997         /* Switch back to kernel console on panic */
 998         /* multi card linked list maybe */
 999         if (list_empty(&kernel_fb_helper_list)) {
1000                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1001                 atomic_notifier_chain_register(&panic_notifier_list,
1002                                                &paniced);
1003                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1004         }
1005
1006         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1007
1008         return 0;
1009 }
1010
1011 /**
1012  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1013  * @info: fbdev registered by the helper
1014  * @pitch: desired pitch
1015  * @depth: desired depth
1016  *
1017  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1018  * fbdev emulations. Drivers which support acceleration methods which impose
1019  * additional constraints need to set up their own limits.
1020  *
1021  * Drivers should call this (or their equivalent setup code) from their
1022  * ->fb_probe callback.
1023  */
1024 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1025                             uint32_t depth)
1026 {
1027         info->fix.type = FB_TYPE_PACKED_PIXELS;
1028         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1029                 FB_VISUAL_TRUECOLOR;
1030         info->fix.mmio_start = 0;
1031         info->fix.mmio_len = 0;
1032         info->fix.type_aux = 0;
1033         info->fix.xpanstep = 1; /* doing it in hw */
1034         info->fix.ypanstep = 1; /* doing it in hw */
1035         info->fix.ywrapstep = 0;
1036         info->fix.accel = FB_ACCEL_NONE;
1037         info->fix.type_aux = 0;
1038
1039         info->fix.line_length = pitch;
1040         return;
1041 }
1042 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1043
1044 /**
1045  * drm_fb_helper_fill_var - initalizes variable fbdev information
1046  * @info: fbdev instance to set up
1047  * @fb_helper: fb helper instance to use as template
1048  * @fb_width: desired fb width
1049  * @fb_height: desired fb height
1050  *
1051  * Sets up the variable fbdev metainformation from the given fb helper instance
1052  * and the drm framebuffer allocated in fb_helper->fb.
1053  *
1054  * Drivers should call this (or their equivalent setup code) from their
1055  * ->fb_probe callback after having allocated the fbdev backing
1056  * storage framebuffer.
1057  */
1058 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1059                             uint32_t fb_width, uint32_t fb_height)
1060 {
1061         struct drm_framebuffer *fb = fb_helper->fb;
1062         info->pseudo_palette = fb_helper->pseudo_palette;
1063         info->var.xres_virtual = fb->width;
1064         info->var.yres_virtual = fb->height;
1065         info->var.bits_per_pixel = fb->bits_per_pixel;
1066         info->var.accel_flags = FB_ACCELF_TEXT;
1067         info->var.xoffset = 0;
1068         info->var.yoffset = 0;
1069         info->var.activate = FB_ACTIVATE_NOW;
1070         info->var.height = -1;
1071         info->var.width = -1;
1072
1073         switch (fb->depth) {
1074         case 8:
1075                 info->var.red.offset = 0;
1076                 info->var.green.offset = 0;
1077                 info->var.blue.offset = 0;
1078                 info->var.red.length = 8; /* 8bit DAC */
1079                 info->var.green.length = 8;
1080                 info->var.blue.length = 8;
1081                 info->var.transp.offset = 0;
1082                 info->var.transp.length = 0;
1083                 break;
1084         case 15:
1085                 info->var.red.offset = 10;
1086                 info->var.green.offset = 5;
1087                 info->var.blue.offset = 0;
1088                 info->var.red.length = 5;
1089                 info->var.green.length = 5;
1090                 info->var.blue.length = 5;
1091                 info->var.transp.offset = 15;
1092                 info->var.transp.length = 1;
1093                 break;
1094         case 16:
1095                 info->var.red.offset = 11;
1096                 info->var.green.offset = 5;
1097                 info->var.blue.offset = 0;
1098                 info->var.red.length = 5;
1099                 info->var.green.length = 6;
1100                 info->var.blue.length = 5;
1101                 info->var.transp.offset = 0;
1102                 break;
1103         case 24:
1104                 info->var.red.offset = 16;
1105                 info->var.green.offset = 8;
1106                 info->var.blue.offset = 0;
1107                 info->var.red.length = 8;
1108                 info->var.green.length = 8;
1109                 info->var.blue.length = 8;
1110                 info->var.transp.offset = 0;
1111                 info->var.transp.length = 0;
1112                 break;
1113         case 32:
1114                 info->var.red.offset = 16;
1115                 info->var.green.offset = 8;
1116                 info->var.blue.offset = 0;
1117                 info->var.red.length = 8;
1118                 info->var.green.length = 8;
1119                 info->var.blue.length = 8;
1120                 info->var.transp.offset = 24;
1121                 info->var.transp.length = 8;
1122                 break;
1123         default:
1124                 break;
1125         }
1126
1127         info->var.xres = fb_width;
1128         info->var.yres = fb_height;
1129 }
1130 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1131
1132 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1133                                                uint32_t maxX,
1134                                                uint32_t maxY)
1135 {
1136         struct drm_connector *connector;
1137         int count = 0;
1138         int i;
1139
1140         for (i = 0; i < fb_helper->connector_count; i++) {
1141                 connector = fb_helper->connector_info[i]->connector;
1142                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1143         }
1144
1145         return count;
1146 }
1147
1148 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1149 {
1150         struct drm_display_mode *mode;
1151
1152         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1153                 if (mode->hdisplay > width ||
1154                     mode->vdisplay > height)
1155                         continue;
1156                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1157                         return mode;
1158         }
1159         return NULL;
1160 }
1161 EXPORT_SYMBOL(drm_has_preferred_mode);
1162
1163 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1164 {
1165         struct drm_cmdline_mode *cmdline_mode;
1166         cmdline_mode = &fb_connector->cmdline_mode;
1167         return cmdline_mode->specified;
1168 }
1169
1170 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1171                                                       int width, int height)
1172 {
1173         struct drm_cmdline_mode *cmdline_mode;
1174         struct drm_display_mode *mode = NULL;
1175         bool prefer_non_interlace;
1176
1177         cmdline_mode = &fb_helper_conn->cmdline_mode;
1178         if (cmdline_mode->specified == false)
1179                 return mode;
1180
1181         /* attempt to find a matching mode in the list of modes
1182          *  we have gotten so far, if not add a CVT mode that conforms
1183          */
1184         if (cmdline_mode->rb || cmdline_mode->margins)
1185                 goto create_mode;
1186
1187         prefer_non_interlace = !cmdline_mode->interlace;
1188  again:
1189         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1190                 /* check width/height */
1191                 if (mode->hdisplay != cmdline_mode->xres ||
1192                     mode->vdisplay != cmdline_mode->yres)
1193                         continue;
1194
1195                 if (cmdline_mode->refresh_specified) {
1196                         if (mode->vrefresh != cmdline_mode->refresh)
1197                                 continue;
1198                 }
1199
1200                 if (cmdline_mode->interlace) {
1201                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1202                                 continue;
1203                 } else if (prefer_non_interlace) {
1204                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1205                                 continue;
1206                 }
1207                 return mode;
1208         }
1209
1210         if (prefer_non_interlace) {
1211                 prefer_non_interlace = false;
1212                 goto again;
1213         }
1214
1215 create_mode:
1216         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1217                                                  cmdline_mode);
1218         list_add(&mode->head, &fb_helper_conn->connector->modes);
1219         return mode;
1220 }
1221 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1222
1223 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1224 {
1225         bool enable;
1226
1227         if (strict)
1228                 enable = connector->status == connector_status_connected;
1229         else
1230                 enable = connector->status != connector_status_disconnected;
1231
1232         return enable;
1233 }
1234
1235 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1236                                   bool *enabled)
1237 {
1238         bool any_enabled = false;
1239         struct drm_connector *connector;
1240         int i = 0;
1241
1242         for (i = 0; i < fb_helper->connector_count; i++) {
1243                 connector = fb_helper->connector_info[i]->connector;
1244                 enabled[i] = drm_connector_enabled(connector, true);
1245                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1246                           enabled[i] ? "yes" : "no");
1247                 any_enabled |= enabled[i];
1248         }
1249
1250         if (any_enabled)
1251                 return;
1252
1253         for (i = 0; i < fb_helper->connector_count; i++) {
1254                 connector = fb_helper->connector_info[i]->connector;
1255                 enabled[i] = drm_connector_enabled(connector, false);
1256         }
1257 }
1258
1259 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1260                               struct drm_display_mode **modes,
1261                               bool *enabled, int width, int height)
1262 {
1263         int count, i, j;
1264         bool can_clone = false;
1265         struct drm_fb_helper_connector *fb_helper_conn;
1266         struct drm_display_mode *dmt_mode, *mode;
1267
1268         /* only contemplate cloning in the single crtc case */
1269         if (fb_helper->crtc_count > 1)
1270                 return false;
1271
1272         count = 0;
1273         for (i = 0; i < fb_helper->connector_count; i++) {
1274                 if (enabled[i])
1275                         count++;
1276         }
1277
1278         /* only contemplate cloning if more than one connector is enabled */
1279         if (count <= 1)
1280                 return false;
1281
1282         /* check the command line or if nothing common pick 1024x768 */
1283         can_clone = true;
1284         for (i = 0; i < fb_helper->connector_count; i++) {
1285                 if (!enabled[i])
1286                         continue;
1287                 fb_helper_conn = fb_helper->connector_info[i];
1288                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1289                 if (!modes[i]) {
1290                         can_clone = false;
1291                         break;
1292                 }
1293                 for (j = 0; j < i; j++) {
1294                         if (!enabled[j])
1295                                 continue;
1296                         if (!drm_mode_equal(modes[j], modes[i]))
1297                                 can_clone = false;
1298                 }
1299         }
1300
1301         if (can_clone) {
1302                 DRM_DEBUG_KMS("can clone using command line\n");
1303                 return true;
1304         }
1305
1306         /* try and find a 1024x768 mode on each connector */
1307         can_clone = true;
1308         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1309
1310         for (i = 0; i < fb_helper->connector_count; i++) {
1311
1312                 if (!enabled[i])
1313                         continue;
1314
1315                 fb_helper_conn = fb_helper->connector_info[i];
1316                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1317                         if (drm_mode_equal(mode, dmt_mode))
1318                                 modes[i] = mode;
1319                 }
1320                 if (!modes[i])
1321                         can_clone = false;
1322         }
1323
1324         if (can_clone) {
1325                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1326                 return true;
1327         }
1328         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1329         return false;
1330 }
1331
1332 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1333                                  struct drm_display_mode **modes,
1334                                  bool *enabled, int width, int height)
1335 {
1336         struct drm_fb_helper_connector *fb_helper_conn;
1337         int i;
1338
1339         for (i = 0; i < fb_helper->connector_count; i++) {
1340                 fb_helper_conn = fb_helper->connector_info[i];
1341
1342                 if (enabled[i] == false)
1343                         continue;
1344
1345                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1346                               fb_helper_conn->connector->base.id);
1347
1348                 /* got for command line mode first */
1349                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1350                 if (!modes[i]) {
1351                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1352                                       fb_helper_conn->connector->base.id);
1353                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1354                 }
1355                 /* No preferred modes, pick one off the list */
1356                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1357                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1358                                 break;
1359                 }
1360                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1361                           "none");
1362         }
1363         return true;
1364 }
1365
1366 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1367                           struct drm_fb_helper_crtc **best_crtcs,
1368                           struct drm_display_mode **modes,
1369                           int n, int width, int height)
1370 {
1371         int c, o;
1372         struct drm_device *dev = fb_helper->dev;
1373         struct drm_connector *connector;
1374         struct drm_connector_helper_funcs *connector_funcs;
1375         struct drm_encoder *encoder;
1376         int my_score, best_score, score;
1377         struct drm_fb_helper_crtc **crtcs, *crtc;
1378         struct drm_fb_helper_connector *fb_helper_conn;
1379
1380         if (n == fb_helper->connector_count)
1381                 return 0;
1382
1383         fb_helper_conn = fb_helper->connector_info[n];
1384         connector = fb_helper_conn->connector;
1385
1386         best_crtcs[n] = NULL;
1387         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1388         if (modes[n] == NULL)
1389                 return best_score;
1390
1391         crtcs = kzalloc(dev->mode_config.num_connector *
1392                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1393         if (!crtcs)
1394                 return best_score;
1395
1396         my_score = 1;
1397         if (connector->status == connector_status_connected)
1398                 my_score++;
1399         if (drm_has_cmdline_mode(fb_helper_conn))
1400                 my_score++;
1401         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1402                 my_score++;
1403
1404         connector_funcs = connector->helper_private;
1405         encoder = connector_funcs->best_encoder(connector);
1406         if (!encoder)
1407                 goto out;
1408
1409         /* select a crtc for this connector and then attempt to configure
1410            remaining connectors */
1411         for (c = 0; c < fb_helper->crtc_count; c++) {
1412                 crtc = &fb_helper->crtc_info[c];
1413
1414                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1415                         continue;
1416
1417                 for (o = 0; o < n; o++)
1418                         if (best_crtcs[o] == crtc)
1419                                 break;
1420
1421                 if (o < n) {
1422                         /* ignore cloning unless only a single crtc */
1423                         if (fb_helper->crtc_count > 1)
1424                                 continue;
1425
1426                         if (!drm_mode_equal(modes[o], modes[n]))
1427                                 continue;
1428                 }
1429
1430                 crtcs[n] = crtc;
1431                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1432                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1433                                                   width, height);
1434                 if (score > best_score) {
1435                         best_score = score;
1436                         memcpy(best_crtcs, crtcs,
1437                                dev->mode_config.num_connector *
1438                                sizeof(struct drm_fb_helper_crtc *));
1439                 }
1440         }
1441 out:
1442         kfree(crtcs);
1443         return best_score;
1444 }
1445
1446 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1447 {
1448         struct drm_device *dev = fb_helper->dev;
1449         struct drm_fb_helper_crtc **crtcs;
1450         struct drm_display_mode **modes;
1451         struct drm_mode_set *modeset;
1452         bool *enabled;
1453         int width, height;
1454         int i;
1455
1456         DRM_DEBUG_KMS("\n");
1457
1458         width = dev->mode_config.max_width;
1459         height = dev->mode_config.max_height;
1460
1461         crtcs = kcalloc(dev->mode_config.num_connector,
1462                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1463         modes = kcalloc(dev->mode_config.num_connector,
1464                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1465         enabled = kcalloc(dev->mode_config.num_connector,
1466                           sizeof(bool), GFP_KERNEL);
1467         if (!crtcs || !modes || !enabled) {
1468                 DRM_ERROR("Memory allocation failed\n");
1469                 goto out;
1470         }
1471
1472
1473         drm_enable_connectors(fb_helper, enabled);
1474
1475         if (!(fb_helper->funcs->initial_config &&
1476               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1477                                                enabled, width, height))) {
1478                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1479                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1480
1481                 if (!drm_target_cloned(fb_helper,
1482                                        modes, enabled, width, height) &&
1483                     !drm_target_preferred(fb_helper,
1484                                           modes, enabled, width, height))
1485                         DRM_ERROR("Unable to find initial modes\n");
1486
1487                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1488                               width, height);
1489
1490                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1491         }
1492
1493         /* need to set the modesets up here for use later */
1494         /* fill out the connector<->crtc mappings into the modesets */
1495         for (i = 0; i < fb_helper->crtc_count; i++) {
1496                 modeset = &fb_helper->crtc_info[i].mode_set;
1497                 modeset->num_connectors = 0;
1498                 modeset->fb = NULL;
1499         }
1500
1501         for (i = 0; i < fb_helper->connector_count; i++) {
1502                 struct drm_display_mode *mode = modes[i];
1503                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1504                 modeset = &fb_crtc->mode_set;
1505
1506                 if (mode && fb_crtc) {
1507                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1508                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1509                         fb_crtc->desired_mode = mode;
1510                         if (modeset->mode)
1511                                 drm_mode_destroy(dev, modeset->mode);
1512                         modeset->mode = drm_mode_duplicate(dev,
1513                                                            fb_crtc->desired_mode);
1514                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1515                         modeset->fb = fb_helper->fb;
1516                 }
1517         }
1518
1519         /* Clear out any old modes if there are no more connected outputs. */
1520         for (i = 0; i < fb_helper->crtc_count; i++) {
1521                 modeset = &fb_helper->crtc_info[i].mode_set;
1522                 if (modeset->num_connectors == 0) {
1523                         BUG_ON(modeset->fb);
1524                         BUG_ON(modeset->num_connectors);
1525                         if (modeset->mode)
1526                                 drm_mode_destroy(dev, modeset->mode);
1527                         modeset->mode = NULL;
1528                 }
1529         }
1530 out:
1531         kfree(crtcs);
1532         kfree(modes);
1533         kfree(enabled);
1534 }
1535
1536 /**
1537  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1538  * @fb_helper: fb_helper device struct
1539  * @bpp_sel: bpp value to use for the framebuffer configuration
1540  *
1541  * Scans the CRTCs and connectors and tries to put together an initial setup.
1542  * At the moment, this is a cloned configuration across all heads with
1543  * a new framebuffer object as the backing store.
1544  *
1545  * Note that this also registers the fbdev and so allows userspace to call into
1546  * the driver through the fbdev interfaces.
1547  *
1548  * This function will call down into the ->fb_probe callback to let
1549  * the driver allocate and initialize the fbdev info structure and the drm
1550  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1551  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1552  * values for the fbdev info structure.
1553  *
1554  * RETURNS:
1555  * Zero if everything went ok, nonzero otherwise.
1556  */
1557 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1558 {
1559         struct drm_device *dev = fb_helper->dev;
1560         int count = 0;
1561
1562         drm_fb_helper_parse_command_line(fb_helper);
1563
1564         mutex_lock(&dev->mode_config.mutex);
1565         count = drm_fb_helper_probe_connector_modes(fb_helper,
1566                                                     dev->mode_config.max_width,
1567                                                     dev->mode_config.max_height);
1568         mutex_unlock(&dev->mode_config.mutex);
1569         /*
1570          * we shouldn't end up with no modes here.
1571          */
1572         if (count == 0)
1573                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1574
1575         drm_setup_crtcs(fb_helper);
1576
1577         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1578 }
1579 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1580
1581 /**
1582  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1583  *                               probing all the outputs attached to the fb
1584  * @fb_helper: the drm_fb_helper
1585  *
1586  * Scan the connectors attached to the fb_helper and try to put together a
1587  * setup after *notification of a change in output configuration.
1588  *
1589  * Called at runtime, takes the mode config locks to be able to check/change the
1590  * modeset configuration. Must be run from process context (which usually means
1591  * either the output polling work or a work item launched from the driver's
1592  * hotplug interrupt).
1593  *
1594  * Note that the driver must ensure that this is only called _after_ the fb has
1595  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1596  *
1597  * RETURNS:
1598  * 0 on success and a non-zero error code otherwise.
1599  */
1600 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1601 {
1602         struct drm_device *dev = fb_helper->dev;
1603         u32 max_width, max_height;
1604
1605         if (!fb_helper->fb)
1606                 return 0;
1607
1608         mutex_lock(&fb_helper->dev->mode_config.mutex);
1609         if (!drm_fb_helper_is_bound(fb_helper)) {
1610                 fb_helper->delayed_hotplug = true;
1611                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1612                 return 0;
1613         }
1614         DRM_DEBUG_KMS("\n");
1615
1616         max_width = fb_helper->fb->width;
1617         max_height = fb_helper->fb->height;
1618
1619         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1620         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1621
1622         drm_modeset_lock_all(dev);
1623         drm_setup_crtcs(fb_helper);
1624         drm_modeset_unlock_all(dev);
1625         drm_fb_helper_set_par(fb_helper->fbdev);
1626
1627         return 0;
1628 }
1629 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1630
1631 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1632  * but the module doesn't depend on any fb console symbols.  At least
1633  * attempt to load fbcon to avoid leaving the system without a usable console.
1634  */
1635 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1636 static int __init drm_fb_helper_modinit(void)
1637 {
1638         const char *name = "fbcon";
1639         struct module *fbcon;
1640
1641         mutex_lock(&module_mutex);
1642         fbcon = find_module(name);
1643         mutex_unlock(&module_mutex);
1644
1645         if (!fbcon)
1646                 request_module_nowait(name);
1647         return 0;
1648 }
1649
1650 module_init(drm_fb_helper_modinit);
1651 #endif