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