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