drivers/gpu/drm/drm_fb_helper.c

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