drm/radeon: don't allow audio on DCE6
[linux-2.6.git] / 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_dpms(struct fb_info *info, int dpms_mode)
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_connector *connector;
315         int i, j;
316
317         /*
318          * For each CRTC in this fb, turn the connectors on/off.
319          */
320         mutex_lock(&dev->mode_config.mutex);
321         for (i = 0; i < fb_helper->crtc_count; i++) {
322                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
323
324                 if (!crtc->enabled)
325                         continue;
326
327                 /* Walk the connectors & encoders on this fb turning them on/off */
328                 for (j = 0; j < fb_helper->connector_count; j++) {
329                         connector = fb_helper->connector_info[j]->connector;
330                         drm_helper_connector_dpms(connector, dpms_mode);
331                         drm_connector_property_set_value(connector,
332                                 dev->mode_config.dpms_property, dpms_mode);
333                 }
334         }
335         mutex_unlock(&dev->mode_config.mutex);
336 }
337
338 int drm_fb_helper_blank(int blank, struct fb_info *info)
339 {
340         switch (blank) {
341         /* Display: On; HSync: On, VSync: On */
342         case FB_BLANK_UNBLANK:
343                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
344                 break;
345         /* Display: Off; HSync: On, VSync: On */
346         case FB_BLANK_NORMAL:
347                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
348                 break;
349         /* Display: Off; HSync: Off, VSync: On */
350         case FB_BLANK_HSYNC_SUSPEND:
351                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
352                 break;
353         /* Display: Off; HSync: On, VSync: Off */
354         case FB_BLANK_VSYNC_SUSPEND:
355                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
356                 break;
357         /* Display: Off; HSync: Off, VSync: Off */
358         case FB_BLANK_POWERDOWN:
359                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
360                 break;
361         }
362         return 0;
363 }
364 EXPORT_SYMBOL(drm_fb_helper_blank);
365
366 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
367 {
368         int i;
369
370         for (i = 0; i < helper->connector_count; i++)
371                 kfree(helper->connector_info[i]);
372         kfree(helper->connector_info);
373         for (i = 0; i < helper->crtc_count; i++) {
374                 kfree(helper->crtc_info[i].mode_set.connectors);
375                 if (helper->crtc_info[i].mode_set.mode)
376                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
377         }
378         kfree(helper->crtc_info);
379 }
380
381 int drm_fb_helper_init(struct drm_device *dev,
382                        struct drm_fb_helper *fb_helper,
383                        int crtc_count, int max_conn_count)
384 {
385         struct drm_crtc *crtc;
386         int ret = 0;
387         int i;
388
389         fb_helper->dev = dev;
390
391         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
392
393         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
394         if (!fb_helper->crtc_info)
395                 return -ENOMEM;
396
397         fb_helper->crtc_count = crtc_count;
398         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
399         if (!fb_helper->connector_info) {
400                 kfree(fb_helper->crtc_info);
401                 return -ENOMEM;
402         }
403         fb_helper->connector_count = 0;
404
405         for (i = 0; i < crtc_count; i++) {
406                 fb_helper->crtc_info[i].mode_set.connectors =
407                         kcalloc(max_conn_count,
408                                 sizeof(struct drm_connector *),
409                                 GFP_KERNEL);
410
411                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
412                         ret = -ENOMEM;
413                         goto out_free;
414                 }
415                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
416         }
417
418         i = 0;
419         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
420                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
421                 i++;
422         }
423
424         return 0;
425 out_free:
426         drm_fb_helper_crtc_free(fb_helper);
427         return -ENOMEM;
428 }
429 EXPORT_SYMBOL(drm_fb_helper_init);
430
431 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
432 {
433         if (!list_empty(&fb_helper->kernel_fb_list)) {
434                 list_del(&fb_helper->kernel_fb_list);
435                 if (list_empty(&kernel_fb_helper_list)) {
436                         printk(KERN_INFO "drm: unregistered panic notifier\n");
437                         atomic_notifier_chain_unregister(&panic_notifier_list,
438                                                          &paniced);
439                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
440                 }
441         }
442
443         drm_fb_helper_crtc_free(fb_helper);
444
445 }
446 EXPORT_SYMBOL(drm_fb_helper_fini);
447
448 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
449                      u16 blue, u16 regno, struct fb_info *info)
450 {
451         struct drm_fb_helper *fb_helper = info->par;
452         struct drm_framebuffer *fb = fb_helper->fb;
453         int pindex;
454
455         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
456                 u32 *palette;
457                 u32 value;
458                 /* place color in psuedopalette */
459                 if (regno > 16)
460                         return -EINVAL;
461                 palette = (u32 *)info->pseudo_palette;
462                 red >>= (16 - info->var.red.length);
463                 green >>= (16 - info->var.green.length);
464                 blue >>= (16 - info->var.blue.length);
465                 value = (red << info->var.red.offset) |
466                         (green << info->var.green.offset) |
467                         (blue << info->var.blue.offset);
468                 if (info->var.transp.length > 0) {
469                         u32 mask = (1 << info->var.transp.length) - 1;
470                         mask <<= info->var.transp.offset;
471                         value |= mask;
472                 }
473                 palette[regno] = value;
474                 return 0;
475         }
476
477         pindex = regno;
478
479         if (fb->bits_per_pixel == 16) {
480                 pindex = regno << 3;
481
482                 if (fb->depth == 16 && regno > 63)
483                         return -EINVAL;
484                 if (fb->depth == 15 && regno > 31)
485                         return -EINVAL;
486
487                 if (fb->depth == 16) {
488                         u16 r, g, b;
489                         int i;
490                         if (regno < 32) {
491                                 for (i = 0; i < 8; i++)
492                                         fb_helper->funcs->gamma_set(crtc, red,
493                                                 green, blue, pindex + i);
494                         }
495
496                         fb_helper->funcs->gamma_get(crtc, &r,
497                                                     &g, &b,
498                                                     pindex >> 1);
499
500                         for (i = 0; i < 4; i++)
501                                 fb_helper->funcs->gamma_set(crtc, r,
502                                                             green, b,
503                                                             (pindex >> 1) + i);
504                 }
505         }
506
507         if (fb->depth != 16)
508                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
509         return 0;
510 }
511
512 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
513 {
514         struct drm_fb_helper *fb_helper = info->par;
515         struct drm_crtc_helper_funcs *crtc_funcs;
516         u16 *red, *green, *blue, *transp;
517         struct drm_crtc *crtc;
518         int i, j, rc = 0;
519         int start;
520
521         for (i = 0; i < fb_helper->crtc_count; i++) {
522                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
523                 crtc_funcs = crtc->helper_private;
524
525                 red = cmap->red;
526                 green = cmap->green;
527                 blue = cmap->blue;
528                 transp = cmap->transp;
529                 start = cmap->start;
530
531                 for (j = 0; j < cmap->len; j++) {
532                         u16 hred, hgreen, hblue, htransp = 0xffff;
533
534                         hred = *red++;
535                         hgreen = *green++;
536                         hblue = *blue++;
537
538                         if (transp)
539                                 htransp = *transp++;
540
541                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
542                         if (rc)
543                                 return rc;
544                 }
545                 crtc_funcs->load_lut(crtc);
546         }
547         return rc;
548 }
549 EXPORT_SYMBOL(drm_fb_helper_setcmap);
550
551 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
552                             struct fb_info *info)
553 {
554         struct drm_fb_helper *fb_helper = info->par;
555         struct drm_framebuffer *fb = fb_helper->fb;
556         int depth;
557
558         if (var->pixclock != 0 || in_dbg_master())
559                 return -EINVAL;
560
561         /* Need to resize the fb object !!! */
562         if (var->bits_per_pixel > fb->bits_per_pixel ||
563             var->xres > fb->width || var->yres > fb->height ||
564             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
565                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
566                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
567                           var->xres, var->yres, var->bits_per_pixel,
568                           var->xres_virtual, var->yres_virtual,
569                           fb->width, fb->height, fb->bits_per_pixel);
570                 return -EINVAL;
571         }
572
573         switch (var->bits_per_pixel) {
574         case 16:
575                 depth = (var->green.length == 6) ? 16 : 15;
576                 break;
577         case 32:
578                 depth = (var->transp.length > 0) ? 32 : 24;
579                 break;
580         default:
581                 depth = var->bits_per_pixel;
582                 break;
583         }
584
585         switch (depth) {
586         case 8:
587                 var->red.offset = 0;
588                 var->green.offset = 0;
589                 var->blue.offset = 0;
590                 var->red.length = 8;
591                 var->green.length = 8;
592                 var->blue.length = 8;
593                 var->transp.length = 0;
594                 var->transp.offset = 0;
595                 break;
596         case 15:
597                 var->red.offset = 10;
598                 var->green.offset = 5;
599                 var->blue.offset = 0;
600                 var->red.length = 5;
601                 var->green.length = 5;
602                 var->blue.length = 5;
603                 var->transp.length = 1;
604                 var->transp.offset = 15;
605                 break;
606         case 16:
607                 var->red.offset = 11;
608                 var->green.offset = 5;
609                 var->blue.offset = 0;
610                 var->red.length = 5;
611                 var->green.length = 6;
612                 var->blue.length = 5;
613                 var->transp.length = 0;
614                 var->transp.offset = 0;
615                 break;
616         case 24:
617                 var->red.offset = 16;
618                 var->green.offset = 8;
619                 var->blue.offset = 0;
620                 var->red.length = 8;
621                 var->green.length = 8;
622                 var->blue.length = 8;
623                 var->transp.length = 0;
624                 var->transp.offset = 0;
625                 break;
626         case 32:
627                 var->red.offset = 16;
628                 var->green.offset = 8;
629                 var->blue.offset = 0;
630                 var->red.length = 8;
631                 var->green.length = 8;
632                 var->blue.length = 8;
633                 var->transp.length = 8;
634                 var->transp.offset = 24;
635                 break;
636         default:
637                 return -EINVAL;
638         }
639         return 0;
640 }
641 EXPORT_SYMBOL(drm_fb_helper_check_var);
642
643 /* this will let fbcon do the mode init */
644 int drm_fb_helper_set_par(struct fb_info *info)
645 {
646         struct drm_fb_helper *fb_helper = info->par;
647         struct drm_device *dev = fb_helper->dev;
648         struct fb_var_screeninfo *var = &info->var;
649         struct drm_crtc *crtc;
650         int ret;
651         int i;
652
653         if (var->pixclock != 0) {
654                 DRM_ERROR("PIXEL CLOCK SET\n");
655                 return -EINVAL;
656         }
657
658         mutex_lock(&dev->mode_config.mutex);
659         for (i = 0; i < fb_helper->crtc_count; i++) {
660                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
661                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
662                 if (ret) {
663                         mutex_unlock(&dev->mode_config.mutex);
664                         return ret;
665                 }
666         }
667         mutex_unlock(&dev->mode_config.mutex);
668
669         if (fb_helper->delayed_hotplug) {
670                 fb_helper->delayed_hotplug = false;
671                 drm_fb_helper_hotplug_event(fb_helper);
672         }
673         return 0;
674 }
675 EXPORT_SYMBOL(drm_fb_helper_set_par);
676
677 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
678                               struct fb_info *info)
679 {
680         struct drm_fb_helper *fb_helper = info->par;
681         struct drm_device *dev = fb_helper->dev;
682         struct drm_mode_set *modeset;
683         struct drm_crtc *crtc;
684         int ret = 0;
685         int i;
686
687         mutex_lock(&dev->mode_config.mutex);
688         for (i = 0; i < fb_helper->crtc_count; i++) {
689                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
690
691                 modeset = &fb_helper->crtc_info[i].mode_set;
692
693                 modeset->x = var->xoffset;
694                 modeset->y = var->yoffset;
695
696                 if (modeset->num_connectors) {
697                         ret = crtc->funcs->set_config(modeset);
698                         if (!ret) {
699                                 info->var.xoffset = var->xoffset;
700                                 info->var.yoffset = var->yoffset;
701                         }
702                 }
703         }
704         mutex_unlock(&dev->mode_config.mutex);
705         return ret;
706 }
707 EXPORT_SYMBOL(drm_fb_helper_pan_display);
708
709 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
710                                   int preferred_bpp)
711 {
712         int new_fb = 0;
713         int crtc_count = 0;
714         int i;
715         struct fb_info *info;
716         struct drm_fb_helper_surface_size sizes;
717         int gamma_size = 0;
718
719         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
720         sizes.surface_depth = 24;
721         sizes.surface_bpp = 32;
722         sizes.fb_width = (unsigned)-1;
723         sizes.fb_height = (unsigned)-1;
724
725         /* if driver picks 8 or 16 by default use that
726            for both depth/bpp */
727         if (preferred_bpp != sizes.surface_bpp) {
728                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
729         }
730         /* first up get a count of crtcs now in use and new min/maxes width/heights */
731         for (i = 0; i < fb_helper->connector_count; i++) {
732                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
733                 struct drm_cmdline_mode *cmdline_mode;
734
735                 cmdline_mode = &fb_helper_conn->cmdline_mode;
736
737                 if (cmdline_mode->bpp_specified) {
738                         switch (cmdline_mode->bpp) {
739                         case 8:
740                                 sizes.surface_depth = sizes.surface_bpp = 8;
741                                 break;
742                         case 15:
743                                 sizes.surface_depth = 15;
744                                 sizes.surface_bpp = 16;
745                                 break;
746                         case 16:
747                                 sizes.surface_depth = sizes.surface_bpp = 16;
748                                 break;
749                         case 24:
750                                 sizes.surface_depth = sizes.surface_bpp = 24;
751                                 break;
752                         case 32:
753                                 sizes.surface_depth = 24;
754                                 sizes.surface_bpp = 32;
755                                 break;
756                         }
757                         break;
758                 }
759         }
760
761         crtc_count = 0;
762         for (i = 0; i < fb_helper->crtc_count; i++) {
763                 struct drm_display_mode *desired_mode;
764                 desired_mode = fb_helper->crtc_info[i].desired_mode;
765
766                 if (desired_mode) {
767                         if (gamma_size == 0)
768                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
769                         if (desired_mode->hdisplay < sizes.fb_width)
770                                 sizes.fb_width = desired_mode->hdisplay;
771                         if (desired_mode->vdisplay < sizes.fb_height)
772                                 sizes.fb_height = desired_mode->vdisplay;
773                         if (desired_mode->hdisplay > sizes.surface_width)
774                                 sizes.surface_width = desired_mode->hdisplay;
775                         if (desired_mode->vdisplay > sizes.surface_height)
776                                 sizes.surface_height = desired_mode->vdisplay;
777                         crtc_count++;
778                 }
779         }
780
781         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
782                 /* hmm everyone went away - assume VGA cable just fell out
783                    and will come back later. */
784                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
785                 sizes.fb_width = sizes.surface_width = 1024;
786                 sizes.fb_height = sizes.surface_height = 768;
787         }
788
789         /* push down into drivers */
790         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
791         if (new_fb < 0)
792                 return new_fb;
793
794         info = fb_helper->fbdev;
795
796         /* set the fb pointer */
797         for (i = 0; i < fb_helper->crtc_count; i++) {
798                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
799         }
800
801         if (new_fb) {
802                 info->var.pixclock = 0;
803                 if (register_framebuffer(info) < 0) {
804                         return -EINVAL;
805                 }
806
807                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
808                        info->fix.id);
809
810         } else {
811                 drm_fb_helper_set_par(info);
812         }
813
814         /* Switch back to kernel console on panic */
815         /* multi card linked list maybe */
816         if (list_empty(&kernel_fb_helper_list)) {
817                 printk(KERN_INFO "drm: registered panic notifier\n");
818                 atomic_notifier_chain_register(&panic_notifier_list,
819                                                &paniced);
820                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
821         }
822         if (new_fb)
823                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
824
825         return 0;
826 }
827 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
828
829 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
830                             uint32_t depth)
831 {
832         info->fix.type = FB_TYPE_PACKED_PIXELS;
833         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
834                 FB_VISUAL_TRUECOLOR;
835         info->fix.mmio_start = 0;
836         info->fix.mmio_len = 0;
837         info->fix.type_aux = 0;
838         info->fix.xpanstep = 1; /* doing it in hw */
839         info->fix.ypanstep = 1; /* doing it in hw */
840         info->fix.ywrapstep = 0;
841         info->fix.accel = FB_ACCEL_NONE;
842         info->fix.type_aux = 0;
843
844         info->fix.line_length = pitch;
845         return;
846 }
847 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
848
849 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
850                             uint32_t fb_width, uint32_t fb_height)
851 {
852         struct drm_framebuffer *fb = fb_helper->fb;
853         info->pseudo_palette = fb_helper->pseudo_palette;
854         info->var.xres_virtual = fb->width;
855         info->var.yres_virtual = fb->height;
856         info->var.bits_per_pixel = fb->bits_per_pixel;
857         info->var.accel_flags = FB_ACCELF_TEXT;
858         info->var.xoffset = 0;
859         info->var.yoffset = 0;
860         info->var.activate = FB_ACTIVATE_NOW;
861         info->var.height = -1;
862         info->var.width = -1;
863
864         switch (fb->depth) {
865         case 8:
866                 info->var.red.offset = 0;
867                 info->var.green.offset = 0;
868                 info->var.blue.offset = 0;
869                 info->var.red.length = 8; /* 8bit DAC */
870                 info->var.green.length = 8;
871                 info->var.blue.length = 8;
872                 info->var.transp.offset = 0;
873                 info->var.transp.length = 0;
874                 break;
875         case 15:
876                 info->var.red.offset = 10;
877                 info->var.green.offset = 5;
878                 info->var.blue.offset = 0;
879                 info->var.red.length = 5;
880                 info->var.green.length = 5;
881                 info->var.blue.length = 5;
882                 info->var.transp.offset = 15;
883                 info->var.transp.length = 1;
884                 break;
885         case 16:
886                 info->var.red.offset = 11;
887                 info->var.green.offset = 5;
888                 info->var.blue.offset = 0;
889                 info->var.red.length = 5;
890                 info->var.green.length = 6;
891                 info->var.blue.length = 5;
892                 info->var.transp.offset = 0;
893                 break;
894         case 24:
895                 info->var.red.offset = 16;
896                 info->var.green.offset = 8;
897                 info->var.blue.offset = 0;
898                 info->var.red.length = 8;
899                 info->var.green.length = 8;
900                 info->var.blue.length = 8;
901                 info->var.transp.offset = 0;
902                 info->var.transp.length = 0;
903                 break;
904         case 32:
905                 info->var.red.offset = 16;
906                 info->var.green.offset = 8;
907                 info->var.blue.offset = 0;
908                 info->var.red.length = 8;
909                 info->var.green.length = 8;
910                 info->var.blue.length = 8;
911                 info->var.transp.offset = 24;
912                 info->var.transp.length = 8;
913                 break;
914         default:
915                 break;
916         }
917
918         info->var.xres = fb_width;
919         info->var.yres = fb_height;
920 }
921 EXPORT_SYMBOL(drm_fb_helper_fill_var);
922
923 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
924                                                uint32_t maxX,
925                                                uint32_t maxY)
926 {
927         struct drm_connector *connector;
928         int count = 0;
929         int i;
930
931         for (i = 0; i < fb_helper->connector_count; i++) {
932                 connector = fb_helper->connector_info[i]->connector;
933                 count += connector->funcs->fill_modes(connector, maxX, maxY);
934         }
935
936         return count;
937 }
938
939 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
940 {
941         struct drm_display_mode *mode;
942
943         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
944                 if (drm_mode_width(mode) > width ||
945                     drm_mode_height(mode) > height)
946                         continue;
947                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
948                         return mode;
949         }
950         return NULL;
951 }
952
953 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
954 {
955         struct drm_cmdline_mode *cmdline_mode;
956         cmdline_mode = &fb_connector->cmdline_mode;
957         return cmdline_mode->specified;
958 }
959
960 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
961                                                       int width, int height)
962 {
963         struct drm_cmdline_mode *cmdline_mode;
964         struct drm_display_mode *mode = NULL;
965
966         cmdline_mode = &fb_helper_conn->cmdline_mode;
967         if (cmdline_mode->specified == false)
968                 return mode;
969
970         /* attempt to find a matching mode in the list of modes
971          *  we have gotten so far, if not add a CVT mode that conforms
972          */
973         if (cmdline_mode->rb || cmdline_mode->margins)
974                 goto create_mode;
975
976         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
977                 /* check width/height */
978                 if (mode->hdisplay != cmdline_mode->xres ||
979                     mode->vdisplay != cmdline_mode->yres)
980                         continue;
981
982                 if (cmdline_mode->refresh_specified) {
983                         if (mode->vrefresh != cmdline_mode->refresh)
984                                 continue;
985                 }
986
987                 if (cmdline_mode->interlace) {
988                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
989                                 continue;
990                 }
991                 return mode;
992         }
993
994 create_mode:
995         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
996                                                  cmdline_mode);
997         list_add(&mode->head, &fb_helper_conn->connector->modes);
998         return mode;
999 }
1000
1001 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1002 {
1003         bool enable;
1004
1005         if (strict) {
1006                 enable = connector->status == connector_status_connected;
1007         } else {
1008                 enable = connector->status != connector_status_disconnected;
1009         }
1010         return enable;
1011 }
1012
1013 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1014                                   bool *enabled)
1015 {
1016         bool any_enabled = false;
1017         struct drm_connector *connector;
1018         int i = 0;
1019
1020         for (i = 0; i < fb_helper->connector_count; i++) {
1021                 connector = fb_helper->connector_info[i]->connector;
1022                 enabled[i] = drm_connector_enabled(connector, true);
1023                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1024                           enabled[i] ? "yes" : "no");
1025                 any_enabled |= enabled[i];
1026         }
1027
1028         if (any_enabled)
1029                 return;
1030
1031         for (i = 0; i < fb_helper->connector_count; i++) {
1032                 connector = fb_helper->connector_info[i]->connector;
1033                 enabled[i] = drm_connector_enabled(connector, false);
1034         }
1035 }
1036
1037 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1038                               struct drm_display_mode **modes,
1039                               bool *enabled, int width, int height)
1040 {
1041         int count, i, j;
1042         bool can_clone = false;
1043         struct drm_fb_helper_connector *fb_helper_conn;
1044         struct drm_display_mode *dmt_mode, *mode;
1045
1046         /* only contemplate cloning in the single crtc case */
1047         if (fb_helper->crtc_count > 1)
1048                 return false;
1049
1050         count = 0;
1051         for (i = 0; i < fb_helper->connector_count; i++) {
1052                 if (enabled[i])
1053                         count++;
1054         }
1055
1056         /* only contemplate cloning if more than one connector is enabled */
1057         if (count <= 1)
1058                 return false;
1059
1060         /* check the command line or if nothing common pick 1024x768 */
1061         can_clone = true;
1062         for (i = 0; i < fb_helper->connector_count; i++) {
1063                 if (!enabled[i])
1064                         continue;
1065                 fb_helper_conn = fb_helper->connector_info[i];
1066                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1067                 if (!modes[i]) {
1068                         can_clone = false;
1069                         break;
1070                 }
1071                 for (j = 0; j < i; j++) {
1072                         if (!enabled[j])
1073                                 continue;
1074                         if (!drm_mode_equal(modes[j], modes[i]))
1075                                 can_clone = false;
1076                 }
1077         }
1078
1079         if (can_clone) {
1080                 DRM_DEBUG_KMS("can clone using command line\n");
1081                 return true;
1082         }
1083
1084         /* try and find a 1024x768 mode on each connector */
1085         can_clone = true;
1086         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1087
1088         for (i = 0; i < fb_helper->connector_count; i++) {
1089
1090                 if (!enabled[i])
1091                         continue;
1092
1093                 fb_helper_conn = fb_helper->connector_info[i];
1094                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1095                         if (drm_mode_equal(mode, dmt_mode))
1096                                 modes[i] = mode;
1097                 }
1098                 if (!modes[i])
1099                         can_clone = false;
1100         }
1101
1102         if (can_clone) {
1103                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1104                 return true;
1105         }
1106         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1107         return false;
1108 }
1109
1110 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1111                                  struct drm_display_mode **modes,
1112                                  bool *enabled, int width, int height)
1113 {
1114         struct drm_fb_helper_connector *fb_helper_conn;
1115         int i;
1116
1117         for (i = 0; i < fb_helper->connector_count; i++) {
1118                 fb_helper_conn = fb_helper->connector_info[i];
1119
1120                 if (enabled[i] == false)
1121                         continue;
1122
1123                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1124                               fb_helper_conn->connector->base.id);
1125
1126                 /* got for command line mode first */
1127                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1128                 if (!modes[i]) {
1129                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1130                                       fb_helper_conn->connector->base.id);
1131                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1132                 }
1133                 /* No preferred modes, pick one off the list */
1134                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1135                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1136                                 break;
1137                 }
1138                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1139                           "none");
1140         }
1141         return true;
1142 }
1143
1144 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1145                           struct drm_fb_helper_crtc **best_crtcs,
1146                           struct drm_display_mode **modes,
1147                           int n, int width, int height)
1148 {
1149         int c, o;
1150         struct drm_device *dev = fb_helper->dev;
1151         struct drm_connector *connector;
1152         struct drm_connector_helper_funcs *connector_funcs;
1153         struct drm_encoder *encoder;
1154         struct drm_fb_helper_crtc *best_crtc;
1155         int my_score, best_score, score;
1156         struct drm_fb_helper_crtc **crtcs, *crtc;
1157         struct drm_fb_helper_connector *fb_helper_conn;
1158
1159         if (n == fb_helper->connector_count)
1160                 return 0;
1161
1162         fb_helper_conn = fb_helper->connector_info[n];
1163         connector = fb_helper_conn->connector;
1164
1165         best_crtcs[n] = NULL;
1166         best_crtc = NULL;
1167         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1168         if (modes[n] == NULL)
1169                 return best_score;
1170
1171         crtcs = kzalloc(dev->mode_config.num_connector *
1172                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1173         if (!crtcs)
1174                 return best_score;
1175
1176         my_score = 1;
1177         if (connector->status == connector_status_connected)
1178                 my_score++;
1179         if (drm_has_cmdline_mode(fb_helper_conn))
1180                 my_score++;
1181         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1182                 my_score++;
1183
1184         connector_funcs = connector->helper_private;
1185         encoder = connector_funcs->best_encoder(connector);
1186         if (!encoder)
1187                 goto out;
1188
1189         /* select a crtc for this connector and then attempt to configure
1190            remaining connectors */
1191         for (c = 0; c < fb_helper->crtc_count; c++) {
1192                 crtc = &fb_helper->crtc_info[c];
1193
1194                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1195                         continue;
1196                 }
1197
1198                 for (o = 0; o < n; o++)
1199                         if (best_crtcs[o] == crtc)
1200                                 break;
1201
1202                 if (o < n) {
1203                         /* ignore cloning unless only a single crtc */
1204                         if (fb_helper->crtc_count > 1)
1205                                 continue;
1206
1207                         if (!drm_mode_equal(modes[o], modes[n]))
1208                                 continue;
1209                 }
1210
1211                 crtcs[n] = crtc;
1212                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1213                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1214                                                   width, height);
1215                 if (score > best_score) {
1216                         best_crtc = crtc;
1217                         best_score = score;
1218                         memcpy(best_crtcs, crtcs,
1219                                dev->mode_config.num_connector *
1220                                sizeof(struct drm_fb_helper_crtc *));
1221                 }
1222         }
1223 out:
1224         kfree(crtcs);
1225         return best_score;
1226 }
1227
1228 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1229 {
1230         struct drm_device *dev = fb_helper->dev;
1231         struct drm_fb_helper_crtc **crtcs;
1232         struct drm_display_mode **modes;
1233         struct drm_encoder *encoder;
1234         struct drm_mode_set *modeset;
1235         bool *enabled;
1236         int width, height;
1237         int i, ret;
1238
1239         DRM_DEBUG_KMS("\n");
1240
1241         width = dev->mode_config.max_width;
1242         height = dev->mode_config.max_height;
1243
1244         /* clean out all the encoder/crtc combos */
1245         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1246                 encoder->crtc = NULL;
1247         }
1248
1249         crtcs = kcalloc(dev->mode_config.num_connector,
1250                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1251         modes = kcalloc(dev->mode_config.num_connector,
1252                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1253         enabled = kcalloc(dev->mode_config.num_connector,
1254                           sizeof(bool), GFP_KERNEL);
1255
1256         drm_enable_connectors(fb_helper, enabled);
1257
1258         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1259         if (!ret) {
1260                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1261                 if (!ret)
1262                         DRM_ERROR("Unable to find initial modes\n");
1263         }
1264
1265         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1266
1267         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1268
1269         /* need to set the modesets up here for use later */
1270         /* fill out the connector<->crtc mappings into the modesets */
1271         for (i = 0; i < fb_helper->crtc_count; i++) {
1272                 modeset = &fb_helper->crtc_info[i].mode_set;
1273                 modeset->num_connectors = 0;
1274         }
1275
1276         for (i = 0; i < fb_helper->connector_count; i++) {
1277                 struct drm_display_mode *mode = modes[i];
1278                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1279                 modeset = &fb_crtc->mode_set;
1280
1281                 if (mode && fb_crtc) {
1282                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1283                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1284                         fb_crtc->desired_mode = mode;
1285                         if (modeset->mode)
1286                                 drm_mode_destroy(dev, modeset->mode);
1287                         modeset->mode = drm_mode_duplicate(dev,
1288                                                            fb_crtc->desired_mode);
1289                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1290                 }
1291         }
1292
1293         kfree(crtcs);
1294         kfree(modes);
1295         kfree(enabled);
1296 }
1297
1298 /**
1299  * drm_helper_initial_config - setup a sane initial connector configuration
1300  * @dev: DRM device
1301  *
1302  * LOCKING:
1303  * Called at init time, must take mode config lock.
1304  *
1305  * Scan the CRTCs and connectors and try to put together an initial setup.
1306  * At the moment, this is a cloned configuration across all heads with
1307  * a new framebuffer object as the backing store.
1308  *
1309  * RETURNS:
1310  * Zero if everything went ok, nonzero otherwise.
1311  */
1312 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1313 {
1314         struct drm_device *dev = fb_helper->dev;
1315         int count = 0;
1316
1317         /* disable all the possible outputs/crtcs before entering KMS mode */
1318         drm_helper_disable_unused_functions(fb_helper->dev);
1319
1320         drm_fb_helper_parse_command_line(fb_helper);
1321
1322         count = drm_fb_helper_probe_connector_modes(fb_helper,
1323                                                     dev->mode_config.max_width,
1324                                                     dev->mode_config.max_height);
1325         /*
1326          * we shouldn't end up with no modes here.
1327          */
1328         if (count == 0) {
1329                 printk(KERN_INFO "No connectors reported connected with modes\n");
1330         }
1331         drm_setup_crtcs(fb_helper);
1332
1333         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1334 }
1335 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1336
1337 /**
1338  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1339  *                               probing all the outputs attached to the fb.
1340  * @fb_helper: the drm_fb_helper
1341  *
1342  * LOCKING:
1343  * Called at runtime, must take mode config lock.
1344  *
1345  * Scan the connectors attached to the fb_helper and try to put together a
1346  * setup after *notification of a change in output configuration.
1347  *
1348  * RETURNS:
1349  * 0 on success and a non-zero error code otherwise.
1350  */
1351 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1352 {
1353         struct drm_device *dev = fb_helper->dev;
1354         int count = 0;
1355         u32 max_width, max_height, bpp_sel;
1356         bool bound = false, crtcs_bound = false;
1357         struct drm_crtc *crtc;
1358
1359         if (!fb_helper->fb)
1360                 return 0;
1361
1362         mutex_lock(&dev->mode_config.mutex);
1363         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1364                 if (crtc->fb)
1365                         crtcs_bound = true;
1366                 if (crtc->fb == fb_helper->fb)
1367                         bound = true;
1368         }
1369
1370         if (!bound && crtcs_bound) {
1371                 fb_helper->delayed_hotplug = true;
1372                 mutex_unlock(&dev->mode_config.mutex);
1373                 return 0;
1374         }
1375         DRM_DEBUG_KMS("\n");
1376
1377         max_width = fb_helper->fb->width;
1378         max_height = fb_helper->fb->height;
1379         bpp_sel = fb_helper->fb->bits_per_pixel;
1380
1381         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1382                                                     max_height);
1383         drm_setup_crtcs(fb_helper);
1384         mutex_unlock(&dev->mode_config.mutex);
1385
1386         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1387 }
1388 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1389
1390 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1391  * but the module doesn't depend on any fb console symbols.  At least
1392  * attempt to load fbcon to avoid leaving the system without a usable console.
1393  */
1394 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1395 static int __init drm_fb_helper_modinit(void)
1396 {
1397         const char *name = "fbcon";
1398         struct module *fbcon;
1399
1400         mutex_lock(&module_mutex);
1401         fbcon = find_module(name);
1402         mutex_unlock(&module_mutex);
1403
1404         if (!fbcon)
1405                 request_module_nowait(name);
1406         return 0;
1407 }
1408
1409 module_init(drm_fb_helper_modinit);
1410 #endif