drm: add KGDB/KDB support
[sfrench/cifs-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 "drmP.h"
35 #include "drm_crtc.h"
36 #include "drm_fb_helper.h"
37 #include "drm_crtc_helper.h"
38
39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
40 MODULE_DESCRIPTION("DRM KMS helper");
41 MODULE_LICENSE("GPL and additional rights");
42
43 static LIST_HEAD(kernel_fb_helper_list);
44
45 /* simple single crtc case helper function */
46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
47 {
48         struct drm_device *dev = fb_helper->dev;
49         struct drm_connector *connector;
50         int i;
51
52         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
53                 struct drm_fb_helper_connector *fb_helper_connector;
54
55                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
56                 if (!fb_helper_connector)
57                         goto fail;
58
59                 fb_helper_connector->connector = connector;
60                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
61         }
62         return 0;
63 fail:
64         for (i = 0; i < fb_helper->connector_count; i++) {
65                 kfree(fb_helper->connector_info[i]);
66                 fb_helper->connector_info[i] = NULL;
67         }
68         fb_helper->connector_count = 0;
69         return -ENOMEM;
70 }
71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
72
73 /**
74  * drm_fb_helper_connector_parse_command_line - parse command line for connector
75  * @connector - connector to parse line for
76  * @mode_option - per connector mode option
77  *
78  * This parses the connector specific then generic command lines for
79  * modes and options to configure the connector.
80  *
81  * This uses the same parameters as the fb modedb.c, except for extra
82  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
83  *
84  * enable/enable Digital/disable bit at the end
85  */
86 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
87                                                        const char *mode_option)
88 {
89         const char *name;
90         unsigned int namelen;
91         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
92         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
93         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
94         int i;
95         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
96         struct drm_fb_helper_cmdline_mode *cmdline_mode;
97         struct drm_connector *connector = fb_helper_conn->connector;
98
99         if (!fb_helper_conn)
100                 return false;
101
102         cmdline_mode = &fb_helper_conn->cmdline_mode;
103         if (!mode_option)
104                 mode_option = fb_mode_option;
105
106         if (!mode_option) {
107                 cmdline_mode->specified = false;
108                 return false;
109         }
110
111         name = mode_option;
112         namelen = strlen(name);
113         for (i = namelen-1; i >= 0; i--) {
114                 switch (name[i]) {
115                 case '@':
116                         namelen = i;
117                         if (!refresh_specified && !bpp_specified &&
118                             !yres_specified) {
119                                 refresh = simple_strtol(&name[i+1], NULL, 10);
120                                 refresh_specified = 1;
121                                 if (cvt || rb)
122                                         cvt = 0;
123                         } else
124                                 goto done;
125                         break;
126                 case '-':
127                         namelen = i;
128                         if (!bpp_specified && !yres_specified) {
129                                 bpp = simple_strtol(&name[i+1], NULL, 10);
130                                 bpp_specified = 1;
131                                 if (cvt || rb)
132                                         cvt = 0;
133                         } else
134                                 goto done;
135                         break;
136                 case 'x':
137                         if (!yres_specified) {
138                                 yres = simple_strtol(&name[i+1], NULL, 10);
139                                 yres_specified = 1;
140                         } else
141                                 goto done;
142                 case '0' ... '9':
143                         break;
144                 case 'M':
145                         if (!yres_specified)
146                                 cvt = 1;
147                         break;
148                 case 'R':
149                         if (cvt)
150                                 rb = 1;
151                         break;
152                 case 'm':
153                         if (!cvt)
154                                 margins = 1;
155                         break;
156                 case 'i':
157                         if (!cvt)
158                                 interlace = 1;
159                         break;
160                 case 'e':
161                         force = DRM_FORCE_ON;
162                         break;
163                 case 'D':
164                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
165                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
166                                 force = DRM_FORCE_ON;
167                         else
168                                 force = DRM_FORCE_ON_DIGITAL;
169                         break;
170                 case 'd':
171                         force = DRM_FORCE_OFF;
172                         break;
173                 default:
174                         goto done;
175                 }
176         }
177         if (i < 0 && yres_specified) {
178                 xres = simple_strtol(name, NULL, 10);
179                 res_specified = 1;
180         }
181 done:
182
183         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
184                 drm_get_connector_name(connector), xres, yres,
185                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
186                 "", (margins) ? " with margins" : "", (interlace) ?
187                 " interlaced" : "");
188
189         if (force) {
190                 const char *s;
191                 switch (force) {
192                 case DRM_FORCE_OFF: s = "OFF"; break;
193                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
194                 default:
195                 case DRM_FORCE_ON: s = "ON"; break;
196                 }
197
198                 DRM_INFO("forcing %s connector %s\n",
199                          drm_get_connector_name(connector), s);
200                 connector->force = force;
201         }
202
203         if (res_specified) {
204                 cmdline_mode->specified = true;
205                 cmdline_mode->xres = xres;
206                 cmdline_mode->yres = yres;
207         }
208
209         if (refresh_specified) {
210                 cmdline_mode->refresh_specified = true;
211                 cmdline_mode->refresh = refresh;
212         }
213
214         if (bpp_specified) {
215                 cmdline_mode->bpp_specified = true;
216                 cmdline_mode->bpp = bpp;
217         }
218         cmdline_mode->rb = rb ? true : false;
219         cmdline_mode->cvt = cvt  ? true : false;
220         cmdline_mode->interlace = interlace ? true : false;
221
222         return true;
223 }
224
225 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
226 {
227         struct drm_fb_helper_connector *fb_helper_conn;
228         int i;
229
230         for (i = 0; i < fb_helper->connector_count; i++) {
231                 char *option = NULL;
232
233                 fb_helper_conn = fb_helper->connector_info[i];
234
235                 /* do something on return - turn off connector maybe */
236                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
237                         continue;
238
239                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
240         }
241         return 0;
242 }
243
244 int drm_fb_helper_debug_enter(struct fb_info *info)
245 {
246         struct drm_fb_helper *helper = info->par;
247         struct drm_crtc_helper_funcs *funcs;
248         int i;
249
250         if (list_empty(&kernel_fb_helper_list))
251                 return false;
252
253         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
254                 for (i = 0; i < helper->crtc_count; i++) {
255                         struct drm_mode_set *mode_set =
256                                 &helper->crtc_info[i].mode_set;
257
258                         if (!mode_set->crtc->enabled)
259                                 continue;
260
261                         funcs = mode_set->crtc->helper_private;
262                         funcs->mode_set_base_atomic(mode_set->crtc,
263                                                     mode_set->fb,
264                                                     mode_set->x,
265                                                     mode_set->y);
266
267                 }
268         }
269
270         return 0;
271 }
272 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
273
274 /* Find the real fb for a given fb helper CRTC */
275 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
276 {
277         struct drm_device *dev = crtc->dev;
278         struct drm_crtc *c;
279
280         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
281                 if (crtc->base.id == c->base.id)
282                         return c->fb;
283         }
284
285         return NULL;
286 }
287
288 int drm_fb_helper_debug_leave(struct fb_info *info)
289 {
290         struct drm_fb_helper *helper = info->par;
291         struct drm_crtc *crtc;
292         struct drm_crtc_helper_funcs *funcs;
293         struct drm_framebuffer *fb;
294         int i;
295
296         for (i = 0; i < helper->crtc_count; i++) {
297                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
298                 crtc = mode_set->crtc;
299                 funcs = crtc->helper_private;
300                 fb = drm_mode_config_fb(crtc);
301
302                 if (!crtc->enabled)
303                         continue;
304
305                 if (!fb) {
306                         DRM_ERROR("no fb to restore??\n");
307                         continue;
308                 }
309
310                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
311                                             crtc->y);
312         }
313
314         return 0;
315 }
316 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
317
318 bool drm_fb_helper_force_kernel_mode(void)
319 {
320         int i = 0;
321         bool ret, error = false;
322         struct drm_fb_helper *helper;
323
324         if (list_empty(&kernel_fb_helper_list))
325                 return false;
326
327         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
328                 for (i = 0; i < helper->crtc_count; i++) {
329                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
330                         ret = drm_crtc_helper_set_config(mode_set);
331                         if (ret)
332                                 error = true;
333                 }
334         }
335         return error;
336 }
337
338 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
339                         void *panic_str)
340 {
341         printk(KERN_ERR "panic occurred, switching back to text console\n");
342         return drm_fb_helper_force_kernel_mode();
343         return 0;
344 }
345 EXPORT_SYMBOL(drm_fb_helper_panic);
346
347 static struct notifier_block paniced = {
348         .notifier_call = drm_fb_helper_panic,
349 };
350
351 /**
352  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
353  *
354  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
355  */
356 void drm_fb_helper_restore(void)
357 {
358         bool ret;
359         ret = drm_fb_helper_force_kernel_mode();
360         if (ret == true)
361                 DRM_ERROR("Failed to restore crtc configuration\n");
362 }
363 EXPORT_SYMBOL(drm_fb_helper_restore);
364
365 #ifdef CONFIG_MAGIC_SYSRQ
366 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
367 {
368         drm_fb_helper_restore();
369 }
370 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
371
372 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
373 {
374         schedule_work(&drm_fb_helper_restore_work);
375 }
376
377 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
378         .handler = drm_fb_helper_sysrq,
379         .help_msg = "force-fb(V)",
380         .action_msg = "Restore framebuffer console",
381 };
382 #else
383 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
384 #endif
385
386 static void drm_fb_helper_on(struct fb_info *info)
387 {
388         struct drm_fb_helper *fb_helper = info->par;
389         struct drm_device *dev = fb_helper->dev;
390         struct drm_crtc *crtc;
391         struct drm_crtc_helper_funcs *crtc_funcs;
392         struct drm_connector *connector;
393         struct drm_encoder *encoder;
394         int i, j;
395
396         /*
397          * For each CRTC in this fb, turn the crtc on then,
398          * find all associated encoders and turn them on.
399          */
400         mutex_lock(&dev->mode_config.mutex);
401         for (i = 0; i < fb_helper->crtc_count; i++) {
402                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
403                 crtc_funcs = crtc->helper_private;
404
405                 if (!crtc->enabled)
406                         continue;
407
408                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
409
410                 /* Walk the connectors & encoders on this fb turning them on */
411                 for (j = 0; j < fb_helper->connector_count; j++) {
412                         connector = fb_helper->connector_info[j]->connector;
413                         connector->dpms = DRM_MODE_DPMS_ON;
414                         drm_connector_property_set_value(connector,
415                                                          dev->mode_config.dpms_property,
416                                                          DRM_MODE_DPMS_ON);
417                 }
418                 /* Found a CRTC on this fb, now find encoders */
419                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
420                         if (encoder->crtc == crtc) {
421                                 struct drm_encoder_helper_funcs *encoder_funcs;
422
423                                 encoder_funcs = encoder->helper_private;
424                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
425                         }
426                 }
427         }
428         mutex_unlock(&dev->mode_config.mutex);
429 }
430
431 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
432 {
433         struct drm_fb_helper *fb_helper = info->par;
434         struct drm_device *dev = fb_helper->dev;
435         struct drm_crtc *crtc;
436         struct drm_crtc_helper_funcs *crtc_funcs;
437         struct drm_connector *connector;
438         struct drm_encoder *encoder;
439         int i, j;
440
441         /*
442          * For each CRTC in this fb, find all associated encoders
443          * and turn them off, then turn off the CRTC.
444          */
445         mutex_lock(&dev->mode_config.mutex);
446         for (i = 0; i < fb_helper->crtc_count; i++) {
447                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
448                 crtc_funcs = crtc->helper_private;
449
450                 if (!crtc->enabled)
451                         continue;
452
453                 /* Walk the connectors on this fb and mark them off */
454                 for (j = 0; j < fb_helper->connector_count; j++) {
455                         connector = fb_helper->connector_info[j]->connector;
456                         connector->dpms = dpms_mode;
457                         drm_connector_property_set_value(connector,
458                                                          dev->mode_config.dpms_property,
459                                                          dpms_mode);
460                 }
461                 /* Found a CRTC on this fb, now find encoders */
462                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
463                         if (encoder->crtc == crtc) {
464                                 struct drm_encoder_helper_funcs *encoder_funcs;
465
466                                 encoder_funcs = encoder->helper_private;
467                                 encoder_funcs->dpms(encoder, dpms_mode);
468                         }
469                 }
470                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
471         }
472         mutex_unlock(&dev->mode_config.mutex);
473 }
474
475 int drm_fb_helper_blank(int blank, struct fb_info *info)
476 {
477         switch (blank) {
478         /* Display: On; HSync: On, VSync: On */
479         case FB_BLANK_UNBLANK:
480                 drm_fb_helper_on(info);
481                 break;
482         /* Display: Off; HSync: On, VSync: On */
483         case FB_BLANK_NORMAL:
484                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
485                 break;
486         /* Display: Off; HSync: Off, VSync: On */
487         case FB_BLANK_HSYNC_SUSPEND:
488                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
489                 break;
490         /* Display: Off; HSync: On, VSync: Off */
491         case FB_BLANK_VSYNC_SUSPEND:
492                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
493                 break;
494         /* Display: Off; HSync: Off, VSync: Off */
495         case FB_BLANK_POWERDOWN:
496                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
497                 break;
498         }
499         return 0;
500 }
501 EXPORT_SYMBOL(drm_fb_helper_blank);
502
503 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
504 {
505         int i;
506
507         for (i = 0; i < helper->connector_count; i++)
508                 kfree(helper->connector_info[i]);
509         kfree(helper->connector_info);
510         for (i = 0; i < helper->crtc_count; i++)
511                 kfree(helper->crtc_info[i].mode_set.connectors);
512         kfree(helper->crtc_info);
513 }
514
515 int drm_fb_helper_init(struct drm_device *dev,
516                        struct drm_fb_helper *fb_helper,
517                        int crtc_count, int max_conn_count)
518 {
519         struct drm_crtc *crtc;
520         int ret = 0;
521         int i;
522
523         fb_helper->dev = dev;
524
525         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
526
527         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
528         if (!fb_helper->crtc_info)
529                 return -ENOMEM;
530
531         fb_helper->crtc_count = crtc_count;
532         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
533         if (!fb_helper->connector_info) {
534                 kfree(fb_helper->crtc_info);
535                 return -ENOMEM;
536         }
537         fb_helper->connector_count = 0;
538
539         for (i = 0; i < crtc_count; i++) {
540                 fb_helper->crtc_info[i].mode_set.connectors =
541                         kcalloc(max_conn_count,
542                                 sizeof(struct drm_connector *),
543                                 GFP_KERNEL);
544
545                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
546                         ret = -ENOMEM;
547                         goto out_free;
548                 }
549                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
550         }
551
552         i = 0;
553         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
554                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
555                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
556                 i++;
557         }
558         fb_helper->conn_limit = max_conn_count;
559         return 0;
560 out_free:
561         drm_fb_helper_crtc_free(fb_helper);
562         return -ENOMEM;
563 }
564 EXPORT_SYMBOL(drm_fb_helper_init);
565
566 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
567 {
568         if (!list_empty(&fb_helper->kernel_fb_list)) {
569                 list_del(&fb_helper->kernel_fb_list);
570                 if (list_empty(&kernel_fb_helper_list)) {
571                         printk(KERN_INFO "drm: unregistered panic notifier\n");
572                         atomic_notifier_chain_unregister(&panic_notifier_list,
573                                                          &paniced);
574                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
575                 }
576         }
577
578         drm_fb_helper_crtc_free(fb_helper);
579
580 }
581 EXPORT_SYMBOL(drm_fb_helper_fini);
582
583 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
584                      u16 blue, u16 regno, struct fb_info *info)
585 {
586         struct drm_fb_helper *fb_helper = info->par;
587         struct drm_framebuffer *fb = fb_helper->fb;
588         int pindex;
589
590         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
591                 u32 *palette;
592                 u32 value;
593                 /* place color in psuedopalette */
594                 if (regno > 16)
595                         return -EINVAL;
596                 palette = (u32 *)info->pseudo_palette;
597                 red >>= (16 - info->var.red.length);
598                 green >>= (16 - info->var.green.length);
599                 blue >>= (16 - info->var.blue.length);
600                 value = (red << info->var.red.offset) |
601                         (green << info->var.green.offset) |
602                         (blue << info->var.blue.offset);
603                 palette[regno] = value;
604                 return 0;
605         }
606
607         pindex = regno;
608
609         if (fb->bits_per_pixel == 16) {
610                 pindex = regno << 3;
611
612                 if (fb->depth == 16 && regno > 63)
613                         return -EINVAL;
614                 if (fb->depth == 15 && regno > 31)
615                         return -EINVAL;
616
617                 if (fb->depth == 16) {
618                         u16 r, g, b;
619                         int i;
620                         if (regno < 32) {
621                                 for (i = 0; i < 8; i++)
622                                         fb_helper->funcs->gamma_set(crtc, red,
623                                                 green, blue, pindex + i);
624                         }
625
626                         fb_helper->funcs->gamma_get(crtc, &r,
627                                                     &g, &b,
628                                                     pindex >> 1);
629
630                         for (i = 0; i < 4; i++)
631                                 fb_helper->funcs->gamma_set(crtc, r,
632                                                             green, b,
633                                                             (pindex >> 1) + i);
634                 }
635         }
636
637         if (fb->depth != 16)
638                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
639         return 0;
640 }
641
642 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
643 {
644         struct drm_fb_helper *fb_helper = info->par;
645         struct drm_crtc_helper_funcs *crtc_funcs;
646         u16 *red, *green, *blue, *transp;
647         struct drm_crtc *crtc;
648         int i, rc = 0;
649         int start;
650
651         for (i = 0; i < fb_helper->crtc_count; i++) {
652                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
653                 crtc_funcs = crtc->helper_private;
654
655                 red = cmap->red;
656                 green = cmap->green;
657                 blue = cmap->blue;
658                 transp = cmap->transp;
659                 start = cmap->start;
660
661                 for (i = 0; i < cmap->len; i++) {
662                         u16 hred, hgreen, hblue, htransp = 0xffff;
663
664                         hred = *red++;
665                         hgreen = *green++;
666                         hblue = *blue++;
667
668                         if (transp)
669                                 htransp = *transp++;
670
671                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
672                         if (rc)
673                                 return rc;
674                 }
675                 crtc_funcs->load_lut(crtc);
676         }
677         return rc;
678 }
679 EXPORT_SYMBOL(drm_fb_helper_setcmap);
680
681 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
682                             struct fb_info *info)
683 {
684         struct drm_fb_helper *fb_helper = info->par;
685         struct drm_framebuffer *fb = fb_helper->fb;
686         int depth;
687
688         if (var->pixclock != 0)
689                 return -EINVAL;
690
691         /* Need to resize the fb object !!! */
692         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
693                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
694                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
695                           fb->width, fb->height, fb->bits_per_pixel);
696                 return -EINVAL;
697         }
698
699         switch (var->bits_per_pixel) {
700         case 16:
701                 depth = (var->green.length == 6) ? 16 : 15;
702                 break;
703         case 32:
704                 depth = (var->transp.length > 0) ? 32 : 24;
705                 break;
706         default:
707                 depth = var->bits_per_pixel;
708                 break;
709         }
710
711         switch (depth) {
712         case 8:
713                 var->red.offset = 0;
714                 var->green.offset = 0;
715                 var->blue.offset = 0;
716                 var->red.length = 8;
717                 var->green.length = 8;
718                 var->blue.length = 8;
719                 var->transp.length = 0;
720                 var->transp.offset = 0;
721                 break;
722         case 15:
723                 var->red.offset = 10;
724                 var->green.offset = 5;
725                 var->blue.offset = 0;
726                 var->red.length = 5;
727                 var->green.length = 5;
728                 var->blue.length = 5;
729                 var->transp.length = 1;
730                 var->transp.offset = 15;
731                 break;
732         case 16:
733                 var->red.offset = 11;
734                 var->green.offset = 5;
735                 var->blue.offset = 0;
736                 var->red.length = 5;
737                 var->green.length = 6;
738                 var->blue.length = 5;
739                 var->transp.length = 0;
740                 var->transp.offset = 0;
741                 break;
742         case 24:
743                 var->red.offset = 16;
744                 var->green.offset = 8;
745                 var->blue.offset = 0;
746                 var->red.length = 8;
747                 var->green.length = 8;
748                 var->blue.length = 8;
749                 var->transp.length = 0;
750                 var->transp.offset = 0;
751                 break;
752         case 32:
753                 var->red.offset = 16;
754                 var->green.offset = 8;
755                 var->blue.offset = 0;
756                 var->red.length = 8;
757                 var->green.length = 8;
758                 var->blue.length = 8;
759                 var->transp.length = 8;
760                 var->transp.offset = 24;
761                 break;
762         default:
763                 return -EINVAL;
764         }
765         return 0;
766 }
767 EXPORT_SYMBOL(drm_fb_helper_check_var);
768
769 /* this will let fbcon do the mode init */
770 int drm_fb_helper_set_par(struct fb_info *info)
771 {
772         struct drm_fb_helper *fb_helper = info->par;
773         struct drm_device *dev = fb_helper->dev;
774         struct fb_var_screeninfo *var = &info->var;
775         struct drm_crtc *crtc;
776         int ret;
777         int i;
778
779         if (var->pixclock != 0) {
780                 DRM_ERROR("PIXEL CLOCK SET\n");
781                 return -EINVAL;
782         }
783
784         mutex_lock(&dev->mode_config.mutex);
785         for (i = 0; i < fb_helper->crtc_count; i++) {
786                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
787                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
788                 if (ret) {
789                         mutex_unlock(&dev->mode_config.mutex);
790                         return ret;
791                 }
792         }
793         mutex_unlock(&dev->mode_config.mutex);
794
795         if (fb_helper->delayed_hotplug) {
796                 fb_helper->delayed_hotplug = false;
797                 drm_fb_helper_hotplug_event(fb_helper);
798         }
799         return 0;
800 }
801 EXPORT_SYMBOL(drm_fb_helper_set_par);
802
803 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
804                               struct fb_info *info)
805 {
806         struct drm_fb_helper *fb_helper = info->par;
807         struct drm_device *dev = fb_helper->dev;
808         struct drm_mode_set *modeset;
809         struct drm_crtc *crtc;
810         int ret = 0;
811         int i;
812
813         mutex_lock(&dev->mode_config.mutex);
814         for (i = 0; i < fb_helper->crtc_count; i++) {
815                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
816
817                 modeset = &fb_helper->crtc_info[i].mode_set;
818
819                 modeset->x = var->xoffset;
820                 modeset->y = var->yoffset;
821
822                 if (modeset->num_connectors) {
823                         ret = crtc->funcs->set_config(modeset);
824                         if (!ret) {
825                                 info->var.xoffset = var->xoffset;
826                                 info->var.yoffset = var->yoffset;
827                         }
828                 }
829         }
830         mutex_unlock(&dev->mode_config.mutex);
831         return ret;
832 }
833 EXPORT_SYMBOL(drm_fb_helper_pan_display);
834
835 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
836                                   int preferred_bpp)
837 {
838         int new_fb = 0;
839         int crtc_count = 0;
840         int i;
841         struct fb_info *info;
842         struct drm_fb_helper_surface_size sizes;
843         int gamma_size = 0;
844
845         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
846         sizes.surface_depth = 24;
847         sizes.surface_bpp = 32;
848         sizes.fb_width = (unsigned)-1;
849         sizes.fb_height = (unsigned)-1;
850
851         /* if driver picks 8 or 16 by default use that
852            for both depth/bpp */
853         if (preferred_bpp != sizes.surface_bpp) {
854                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
855         }
856         /* first up get a count of crtcs now in use and new min/maxes width/heights */
857         for (i = 0; i < fb_helper->connector_count; i++) {
858                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
859                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
860
861                 cmdline_mode = &fb_helper_conn->cmdline_mode;
862
863                 if (cmdline_mode->bpp_specified) {
864                         switch (cmdline_mode->bpp) {
865                         case 8:
866                                 sizes.surface_depth = sizes.surface_bpp = 8;
867                                 break;
868                         case 15:
869                                 sizes.surface_depth = 15;
870                                 sizes.surface_bpp = 16;
871                                 break;
872                         case 16:
873                                 sizes.surface_depth = sizes.surface_bpp = 16;
874                                 break;
875                         case 24:
876                                 sizes.surface_depth = sizes.surface_bpp = 24;
877                                 break;
878                         case 32:
879                                 sizes.surface_depth = 24;
880                                 sizes.surface_bpp = 32;
881                                 break;
882                         }
883                         break;
884                 }
885         }
886
887         crtc_count = 0;
888         for (i = 0; i < fb_helper->crtc_count; i++) {
889                 struct drm_display_mode *desired_mode;
890                 desired_mode = fb_helper->crtc_info[i].desired_mode;
891
892                 if (desired_mode) {
893                         if (gamma_size == 0)
894                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
895                         if (desired_mode->hdisplay < sizes.fb_width)
896                                 sizes.fb_width = desired_mode->hdisplay;
897                         if (desired_mode->vdisplay < sizes.fb_height)
898                                 sizes.fb_height = desired_mode->vdisplay;
899                         if (desired_mode->hdisplay > sizes.surface_width)
900                                 sizes.surface_width = desired_mode->hdisplay;
901                         if (desired_mode->vdisplay > sizes.surface_height)
902                                 sizes.surface_height = desired_mode->vdisplay;
903                         crtc_count++;
904                 }
905         }
906
907         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
908                 /* hmm everyone went away - assume VGA cable just fell out
909                    and will come back later. */
910                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
911                 sizes.fb_width = sizes.surface_width = 1024;
912                 sizes.fb_height = sizes.surface_height = 768;
913         }
914
915         /* push down into drivers */
916         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
917         if (new_fb < 0)
918                 return new_fb;
919
920         info = fb_helper->fbdev;
921
922         /* set the fb pointer */
923         for (i = 0; i < fb_helper->crtc_count; i++) {
924                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
925         }
926
927         if (new_fb) {
928                 info->var.pixclock = 0;
929                 if (register_framebuffer(info) < 0) {
930                         return -EINVAL;
931                 }
932
933                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
934                        info->fix.id);
935
936         } else {
937                 drm_fb_helper_set_par(info);
938         }
939
940         /* Switch back to kernel console on panic */
941         /* multi card linked list maybe */
942         if (list_empty(&kernel_fb_helper_list)) {
943                 printk(KERN_INFO "drm: registered panic notifier\n");
944                 atomic_notifier_chain_register(&panic_notifier_list,
945                                                &paniced);
946                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
947         }
948         if (new_fb)
949                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
950
951         return 0;
952 }
953 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
954
955 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
956                             uint32_t depth)
957 {
958         info->fix.type = FB_TYPE_PACKED_PIXELS;
959         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
960                 FB_VISUAL_TRUECOLOR;
961         info->fix.type_aux = 0;
962         info->fix.xpanstep = 1; /* doing it in hw */
963         info->fix.ypanstep = 1; /* doing it in hw */
964         info->fix.ywrapstep = 0;
965         info->fix.accel = FB_ACCEL_NONE;
966         info->fix.type_aux = 0;
967
968         info->fix.line_length = pitch;
969         return;
970 }
971 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
972
973 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
974                             uint32_t fb_width, uint32_t fb_height)
975 {
976         struct drm_framebuffer *fb = fb_helper->fb;
977         info->pseudo_palette = fb_helper->pseudo_palette;
978         info->var.xres_virtual = fb->width;
979         info->var.yres_virtual = fb->height;
980         info->var.bits_per_pixel = fb->bits_per_pixel;
981         info->var.xoffset = 0;
982         info->var.yoffset = 0;
983         info->var.activate = FB_ACTIVATE_NOW;
984         info->var.height = -1;
985         info->var.width = -1;
986
987         switch (fb->depth) {
988         case 8:
989                 info->var.red.offset = 0;
990                 info->var.green.offset = 0;
991                 info->var.blue.offset = 0;
992                 info->var.red.length = 8; /* 8bit DAC */
993                 info->var.green.length = 8;
994                 info->var.blue.length = 8;
995                 info->var.transp.offset = 0;
996                 info->var.transp.length = 0;
997                 break;
998         case 15:
999                 info->var.red.offset = 10;
1000                 info->var.green.offset = 5;
1001                 info->var.blue.offset = 0;
1002                 info->var.red.length = 5;
1003                 info->var.green.length = 5;
1004                 info->var.blue.length = 5;
1005                 info->var.transp.offset = 15;
1006                 info->var.transp.length = 1;
1007                 break;
1008         case 16:
1009                 info->var.red.offset = 11;
1010                 info->var.green.offset = 5;
1011                 info->var.blue.offset = 0;
1012                 info->var.red.length = 5;
1013                 info->var.green.length = 6;
1014                 info->var.blue.length = 5;
1015                 info->var.transp.offset = 0;
1016                 break;
1017         case 24:
1018                 info->var.red.offset = 16;
1019                 info->var.green.offset = 8;
1020                 info->var.blue.offset = 0;
1021                 info->var.red.length = 8;
1022                 info->var.green.length = 8;
1023                 info->var.blue.length = 8;
1024                 info->var.transp.offset = 0;
1025                 info->var.transp.length = 0;
1026                 break;
1027         case 32:
1028                 info->var.red.offset = 16;
1029                 info->var.green.offset = 8;
1030                 info->var.blue.offset = 0;
1031                 info->var.red.length = 8;
1032                 info->var.green.length = 8;
1033                 info->var.blue.length = 8;
1034                 info->var.transp.offset = 24;
1035                 info->var.transp.length = 8;
1036                 break;
1037         default:
1038                 break;
1039         }
1040
1041         info->var.xres = fb_width;
1042         info->var.yres = fb_height;
1043 }
1044 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1045
1046 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1047                                                uint32_t maxX,
1048                                                uint32_t maxY)
1049 {
1050         struct drm_connector *connector;
1051         int count = 0;
1052         int i;
1053
1054         for (i = 0; i < fb_helper->connector_count; i++) {
1055                 connector = fb_helper->connector_info[i]->connector;
1056                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1057         }
1058
1059         return count;
1060 }
1061
1062 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1063 {
1064         struct drm_display_mode *mode;
1065
1066         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1067                 if (drm_mode_width(mode) > width ||
1068                     drm_mode_height(mode) > height)
1069                         continue;
1070                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1071                         return mode;
1072         }
1073         return NULL;
1074 }
1075
1076 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1077 {
1078         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1079         cmdline_mode = &fb_connector->cmdline_mode;
1080         return cmdline_mode->specified;
1081 }
1082
1083 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1084                                                       int width, int height)
1085 {
1086         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1087         struct drm_display_mode *mode = NULL;
1088
1089         cmdline_mode = &fb_helper_conn->cmdline_mode;
1090         if (cmdline_mode->specified == false)
1091                 return mode;
1092
1093         /* attempt to find a matching mode in the list of modes
1094          *  we have gotten so far, if not add a CVT mode that conforms
1095          */
1096         if (cmdline_mode->rb || cmdline_mode->margins)
1097                 goto create_mode;
1098
1099         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1100                 /* check width/height */
1101                 if (mode->hdisplay != cmdline_mode->xres ||
1102                     mode->vdisplay != cmdline_mode->yres)
1103                         continue;
1104
1105                 if (cmdline_mode->refresh_specified) {
1106                         if (mode->vrefresh != cmdline_mode->refresh)
1107                                 continue;
1108                 }
1109
1110                 if (cmdline_mode->interlace) {
1111                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1112                                 continue;
1113                 }
1114                 return mode;
1115         }
1116
1117 create_mode:
1118         if (cmdline_mode->cvt)
1119                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1120                                     cmdline_mode->xres, cmdline_mode->yres,
1121                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1122                                     cmdline_mode->rb, cmdline_mode->interlace,
1123                                     cmdline_mode->margins);
1124         else
1125                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1126                                     cmdline_mode->xres, cmdline_mode->yres,
1127                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1128                                     cmdline_mode->interlace,
1129                                     cmdline_mode->margins);
1130         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1131         list_add(&mode->head, &fb_helper_conn->connector->modes);
1132         return mode;
1133 }
1134
1135 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1136 {
1137         bool enable;
1138
1139         if (strict) {
1140                 enable = connector->status == connector_status_connected;
1141         } else {
1142                 enable = connector->status != connector_status_disconnected;
1143         }
1144         return enable;
1145 }
1146
1147 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1148                                   bool *enabled)
1149 {
1150         bool any_enabled = false;
1151         struct drm_connector *connector;
1152         int i = 0;
1153
1154         for (i = 0; i < fb_helper->connector_count; i++) {
1155                 connector = fb_helper->connector_info[i]->connector;
1156                 enabled[i] = drm_connector_enabled(connector, true);
1157                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1158                           enabled[i] ? "yes" : "no");
1159                 any_enabled |= enabled[i];
1160         }
1161
1162         if (any_enabled)
1163                 return;
1164
1165         for (i = 0; i < fb_helper->connector_count; i++) {
1166                 connector = fb_helper->connector_info[i]->connector;
1167                 enabled[i] = drm_connector_enabled(connector, false);
1168         }
1169 }
1170
1171 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1172                               struct drm_display_mode **modes,
1173                               bool *enabled, int width, int height)
1174 {
1175         int count, i, j;
1176         bool can_clone = false;
1177         struct drm_fb_helper_connector *fb_helper_conn;
1178         struct drm_display_mode *dmt_mode, *mode;
1179
1180         /* only contemplate cloning in the single crtc case */
1181         if (fb_helper->crtc_count > 1)
1182                 return false;
1183
1184         count = 0;
1185         for (i = 0; i < fb_helper->connector_count; i++) {
1186                 if (enabled[i])
1187                         count++;
1188         }
1189
1190         /* only contemplate cloning if more than one connector is enabled */
1191         if (count <= 1)
1192                 return false;
1193
1194         /* check the command line or if nothing common pick 1024x768 */
1195         can_clone = true;
1196         for (i = 0; i < fb_helper->connector_count; i++) {
1197                 if (!enabled[i])
1198                         continue;
1199                 fb_helper_conn = fb_helper->connector_info[i];
1200                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1201                 if (!modes[i]) {
1202                         can_clone = false;
1203                         break;
1204                 }
1205                 for (j = 0; j < i; j++) {
1206                         if (!enabled[j])
1207                                 continue;
1208                         if (!drm_mode_equal(modes[j], modes[i]))
1209                                 can_clone = false;
1210                 }
1211         }
1212
1213         if (can_clone) {
1214                 DRM_DEBUG_KMS("can clone using command line\n");
1215                 return true;
1216         }
1217
1218         /* try and find a 1024x768 mode on each connector */
1219         can_clone = true;
1220         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1221
1222         for (i = 0; i < fb_helper->connector_count; i++) {
1223
1224                 if (!enabled[i])
1225                         continue;
1226
1227                 fb_helper_conn = fb_helper->connector_info[i];
1228                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1229                         if (drm_mode_equal(mode, dmt_mode))
1230                                 modes[i] = mode;
1231                 }
1232                 if (!modes[i])
1233                         can_clone = false;
1234         }
1235
1236         if (can_clone) {
1237                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1238                 return true;
1239         }
1240         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1241         return false;
1242 }
1243
1244 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1245                                  struct drm_display_mode **modes,
1246                                  bool *enabled, int width, int height)
1247 {
1248         struct drm_fb_helper_connector *fb_helper_conn;
1249         int i;
1250
1251         for (i = 0; i < fb_helper->connector_count; i++) {
1252                 fb_helper_conn = fb_helper->connector_info[i];
1253
1254                 if (enabled[i] == false)
1255                         continue;
1256
1257                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1258                               fb_helper_conn->connector->base.id);
1259
1260                 /* got for command line mode first */
1261                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1262                 if (!modes[i]) {
1263                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1264                                       fb_helper_conn->connector->base.id);
1265                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1266                 }
1267                 /* No preferred modes, pick one off the list */
1268                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1269                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1270                                 break;
1271                 }
1272                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1273                           "none");
1274         }
1275         return true;
1276 }
1277
1278 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1279                           struct drm_fb_helper_crtc **best_crtcs,
1280                           struct drm_display_mode **modes,
1281                           int n, int width, int height)
1282 {
1283         int c, o;
1284         struct drm_device *dev = fb_helper->dev;
1285         struct drm_connector *connector;
1286         struct drm_connector_helper_funcs *connector_funcs;
1287         struct drm_encoder *encoder;
1288         struct drm_fb_helper_crtc *best_crtc;
1289         int my_score, best_score, score;
1290         struct drm_fb_helper_crtc **crtcs, *crtc;
1291         struct drm_fb_helper_connector *fb_helper_conn;
1292
1293         if (n == fb_helper->connector_count)
1294                 return 0;
1295
1296         fb_helper_conn = fb_helper->connector_info[n];
1297         connector = fb_helper_conn->connector;
1298
1299         best_crtcs[n] = NULL;
1300         best_crtc = NULL;
1301         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1302         if (modes[n] == NULL)
1303                 return best_score;
1304
1305         crtcs = kzalloc(dev->mode_config.num_connector *
1306                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1307         if (!crtcs)
1308                 return best_score;
1309
1310         my_score = 1;
1311         if (connector->status == connector_status_connected)
1312                 my_score++;
1313         if (drm_has_cmdline_mode(fb_helper_conn))
1314                 my_score++;
1315         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1316                 my_score++;
1317
1318         connector_funcs = connector->helper_private;
1319         encoder = connector_funcs->best_encoder(connector);
1320         if (!encoder)
1321                 goto out;
1322
1323         /* select a crtc for this connector and then attempt to configure
1324            remaining connectors */
1325         for (c = 0; c < fb_helper->crtc_count; c++) {
1326                 crtc = &fb_helper->crtc_info[c];
1327
1328                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1329                         continue;
1330                 }
1331
1332                 for (o = 0; o < n; o++)
1333                         if (best_crtcs[o] == crtc)
1334                                 break;
1335
1336                 if (o < n) {
1337                         /* ignore cloning unless only a single crtc */
1338                         if (fb_helper->crtc_count > 1)
1339                                 continue;
1340
1341                         if (!drm_mode_equal(modes[o], modes[n]))
1342                                 continue;
1343                 }
1344
1345                 crtcs[n] = crtc;
1346                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1347                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1348                                                   width, height);
1349                 if (score > best_score) {
1350                         best_crtc = crtc;
1351                         best_score = score;
1352                         memcpy(best_crtcs, crtcs,
1353                                dev->mode_config.num_connector *
1354                                sizeof(struct drm_fb_helper_crtc *));
1355                 }
1356         }
1357 out:
1358         kfree(crtcs);
1359         return best_score;
1360 }
1361
1362 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1363 {
1364         struct drm_device *dev = fb_helper->dev;
1365         struct drm_fb_helper_crtc **crtcs;
1366         struct drm_display_mode **modes;
1367         struct drm_encoder *encoder;
1368         struct drm_mode_set *modeset;
1369         bool *enabled;
1370         int width, height;
1371         int i, ret;
1372
1373         DRM_DEBUG_KMS("\n");
1374
1375         width = dev->mode_config.max_width;
1376         height = dev->mode_config.max_height;
1377
1378         /* clean out all the encoder/crtc combos */
1379         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1380                 encoder->crtc = NULL;
1381         }
1382
1383         crtcs = kcalloc(dev->mode_config.num_connector,
1384                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1385         modes = kcalloc(dev->mode_config.num_connector,
1386                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1387         enabled = kcalloc(dev->mode_config.num_connector,
1388                           sizeof(bool), GFP_KERNEL);
1389
1390         drm_enable_connectors(fb_helper, enabled);
1391
1392         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1393         if (!ret) {
1394                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1395                 if (!ret)
1396                         DRM_ERROR("Unable to find initial modes\n");
1397         }
1398
1399         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1400
1401         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1402
1403         /* need to set the modesets up here for use later */
1404         /* fill out the connector<->crtc mappings into the modesets */
1405         for (i = 0; i < fb_helper->crtc_count; i++) {
1406                 modeset = &fb_helper->crtc_info[i].mode_set;
1407                 modeset->num_connectors = 0;
1408         }
1409
1410         for (i = 0; i < fb_helper->connector_count; i++) {
1411                 struct drm_display_mode *mode = modes[i];
1412                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1413                 modeset = &fb_crtc->mode_set;
1414
1415                 if (mode && fb_crtc) {
1416                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1417                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1418                         fb_crtc->desired_mode = mode;
1419                         if (modeset->mode)
1420                                 drm_mode_destroy(dev, modeset->mode);
1421                         modeset->mode = drm_mode_duplicate(dev,
1422                                                            fb_crtc->desired_mode);
1423                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1424                 }
1425         }
1426
1427         kfree(crtcs);
1428         kfree(modes);
1429         kfree(enabled);
1430 }
1431
1432 /**
1433  * drm_helper_initial_config - setup a sane initial connector configuration
1434  * @dev: DRM device
1435  *
1436  * LOCKING:
1437  * Called at init time, must take mode config lock.
1438  *
1439  * Scan the CRTCs and connectors and try to put together an initial setup.
1440  * At the moment, this is a cloned configuration across all heads with
1441  * a new framebuffer object as the backing store.
1442  *
1443  * RETURNS:
1444  * Zero if everything went ok, nonzero otherwise.
1445  */
1446 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1447 {
1448         struct drm_device *dev = fb_helper->dev;
1449         int count = 0;
1450
1451         /* disable all the possible outputs/crtcs before entering KMS mode */
1452         drm_helper_disable_unused_functions(fb_helper->dev);
1453
1454         drm_fb_helper_parse_command_line(fb_helper);
1455
1456         count = drm_fb_helper_probe_connector_modes(fb_helper,
1457                                                     dev->mode_config.max_width,
1458                                                     dev->mode_config.max_height);
1459         /*
1460          * we shouldn't end up with no modes here.
1461          */
1462         if (count == 0) {
1463                 printk(KERN_INFO "No connectors reported connected with modes\n");
1464         }
1465         drm_setup_crtcs(fb_helper);
1466
1467         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1468 }
1469 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1470
1471 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1472 {
1473         int count = 0;
1474         u32 max_width, max_height, bpp_sel;
1475         bool bound = false, crtcs_bound = false;
1476         struct drm_crtc *crtc;
1477
1478         if (!fb_helper->fb)
1479                 return false;
1480
1481         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1482                 if (crtc->fb)
1483                         crtcs_bound = true;
1484                 if (crtc->fb == fb_helper->fb)
1485                         bound = true;
1486         }
1487
1488         if (!bound && crtcs_bound) {
1489                 fb_helper->delayed_hotplug = true;
1490                 return false;
1491         }
1492         DRM_DEBUG_KMS("\n");
1493
1494         max_width = fb_helper->fb->width;
1495         max_height = fb_helper->fb->height;
1496         bpp_sel = fb_helper->fb->bits_per_pixel;
1497
1498         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1499                                                     max_height);
1500         drm_setup_crtcs(fb_helper);
1501
1502         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1503 }
1504 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1505