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