projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / blob
? search:


9b773d51cff502780ec31911d6569ff08f5e4b50
[GitHub/LineageOS/android_kernel_samsung_universal7580.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 i;
387
388 fb_helper->dev = dev;
389
390 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
391
392 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
393 if (!fb_helper->crtc_info)
394 return -ENOMEM;
395
396 fb_helper->crtc_count = crtc_count;
397 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
398 if (!fb_helper->connector_info) {
399 kfree(fb_helper->crtc_info);
400 return -ENOMEM;
401 }
402 fb_helper->connector_count = 0;
403
404 for (i = 0; i < crtc_count; i++) {
405 fb_helper->crtc_info[i].mode_set.connectors =
406 kcalloc(max_conn_count,
407 sizeof(struct drm_connector *),
408 GFP_KERNEL);
409
410 if (!fb_helper->crtc_info[i].mode_set.connectors)
411 goto out_free;
412 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
413 }
414
415 i = 0;
416 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
417 fb_helper->crtc_info[i].mode_set.crtc = crtc;
418 i++;
419 }
420
421 return 0;
422 out_free:
423 drm_fb_helper_crtc_free(fb_helper);
424 return -ENOMEM;
425 }
426 EXPORT_SYMBOL(drm_fb_helper_init);
427
428 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
429 {
430 if (!list_empty(&fb_helper->kernel_fb_list)) {
431 list_del(&fb_helper->kernel_fb_list);
432 if (list_empty(&kernel_fb_helper_list)) {
433 printk(KERN_INFO "drm: unregistered panic notifier\n");
434 atomic_notifier_chain_unregister(&panic_notifier_list,
435 &paniced);
436 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
437 }
438 }
439
440 drm_fb_helper_crtc_free(fb_helper);
441
442 }
443 EXPORT_SYMBOL(drm_fb_helper_fini);
444
445 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
446 u16 blue, u16 regno, struct fb_info *info)
447 {
448 struct drm_fb_helper *fb_helper = info->par;
449 struct drm_framebuffer *fb = fb_helper->fb;
450 int pindex;
451
452 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
453 u32 *palette;
454 u32 value;
455 /* place color in psuedopalette */
456 if (regno > 16)
457 return -EINVAL;
458 palette = (u32 *)info->pseudo_palette;
459 red >>= (16 - info->var.red.length);
460 green >>= (16 - info->var.green.length);
461 blue >>= (16 - info->var.blue.length);
462 value = (red << info->var.red.offset) |
463 (green << info->var.green.offset) |
464 (blue << info->var.blue.offset);
465 if (info->var.transp.length > 0) {
466 u32 mask = (1 << info->var.transp.length) - 1;
467 mask <<= info->var.transp.offset;
468 value |= mask;
469 }
470 palette[regno] = value;
471 return 0;
472 }
473
474 pindex = regno;
475
476 if (fb->bits_per_pixel == 16) {
477 pindex = regno << 3;
478
479 if (fb->depth == 16 && regno > 63)
480 return -EINVAL;
481 if (fb->depth == 15 && regno > 31)
482 return -EINVAL;
483
484 if (fb->depth == 16) {
485 u16 r, g, b;
486 int i;
487 if (regno < 32) {
488 for (i = 0; i < 8; i++)
489 fb_helper->funcs->gamma_set(crtc, red,
490 green, blue, pindex + i);
491 }
492
493 fb_helper->funcs->gamma_get(crtc, &r,
494 &g, &b,
495 pindex >> 1);
496
497 for (i = 0; i < 4; i++)
498 fb_helper->funcs->gamma_set(crtc, r,
499 green, b,
500 (pindex >> 1) + i);
501 }
502 }
503
504 if (fb->depth != 16)
505 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
506 return 0;
507 }
508
509 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
510 {
511 struct drm_fb_helper *fb_helper = info->par;
512 struct drm_crtc_helper_funcs *crtc_funcs;
513 u16 *red, *green, *blue, *transp;
514 struct drm_crtc *crtc;
515 int i, j, rc = 0;
516 int start;
517
518 for (i = 0; i < fb_helper->crtc_count; i++) {
519 crtc = fb_helper->crtc_info[i].mode_set.crtc;
520 crtc_funcs = crtc->helper_private;
521
522 red = cmap->red;
523 green = cmap->green;
524 blue = cmap->blue;
525 transp = cmap->transp;
526 start = cmap->start;
527
528 for (j = 0; j < cmap->len; j++) {
529 u16 hred, hgreen, hblue, htransp = 0xffff;
530
531 hred = *red++;
532 hgreen = *green++;
533 hblue = *blue++;
534
535 if (transp)
536 htransp = *transp++;
537
538 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
539 if (rc)
540 return rc;
541 }
542 crtc_funcs->load_lut(crtc);
543 }
544 return rc;
545 }
546 EXPORT_SYMBOL(drm_fb_helper_setcmap);
547
548 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
549 struct fb_info *info)
550 {
551 struct drm_fb_helper *fb_helper = info->par;
552 struct drm_framebuffer *fb = fb_helper->fb;
553 int depth;
554
555 if (var->pixclock != 0 || in_dbg_master())
556 return -EINVAL;
557
558 /* Need to resize the fb object !!! */
559 if (var->bits_per_pixel > fb->bits_per_pixel ||
560 var->xres > fb->width || var->yres > fb->height ||
561 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
562 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
563 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
564 var->xres, var->yres, var->bits_per_pixel,
565 var->xres_virtual, var->yres_virtual,
566 fb->width, fb->height, fb->bits_per_pixel);
567 return -EINVAL;
568 }
569
570 switch (var->bits_per_pixel) {
571 case 16:
572 depth = (var->green.length == 6) ? 16 : 15;
573 break;
574 case 32:
575 depth = (var->transp.length > 0) ? 32 : 24;
576 break;
577 default:
578 depth = var->bits_per_pixel;
579 break;
580 }
581
582 switch (depth) {
583 case 8:
584 var->red.offset = 0;
585 var->green.offset = 0;
586 var->blue.offset = 0;
587 var->red.length = 8;
588 var->green.length = 8;
589 var->blue.length = 8;
590 var->transp.length = 0;
591 var->transp.offset = 0;
592 break;
593 case 15:
594 var->red.offset = 10;
595 var->green.offset = 5;
596 var->blue.offset = 0;
597 var->red.length = 5;
598 var->green.length = 5;
599 var->blue.length = 5;
600 var->transp.length = 1;
601 var->transp.offset = 15;
602 break;
603 case 16:
604 var->red.offset = 11;
605 var->green.offset = 5;
606 var->blue.offset = 0;
607 var->red.length = 5;
608 var->green.length = 6;
609 var->blue.length = 5;
610 var->transp.length = 0;
611 var->transp.offset = 0;
612 break;
613 case 24:
614 var->red.offset = 16;
615 var->green.offset = 8;
616 var->blue.offset = 0;
617 var->red.length = 8;
618 var->green.length = 8;
619 var->blue.length = 8;
620 var->transp.length = 0;
621 var->transp.offset = 0;
622 break;
623 case 32:
624 var->red.offset = 16;
625 var->green.offset = 8;
626 var->blue.offset = 0;
627 var->red.length = 8;
628 var->green.length = 8;
629 var->blue.length = 8;
630 var->transp.length = 8;
631 var->transp.offset = 24;
632 break;
633 default:
634 return -EINVAL;
635 }
636 return 0;
637 }
638 EXPORT_SYMBOL(drm_fb_helper_check_var);
639
640 /* this will let fbcon do the mode init */
641 int drm_fb_helper_set_par(struct fb_info *info)
642 {
643 struct drm_fb_helper *fb_helper = info->par;
644 struct drm_device *dev = fb_helper->dev;
645 struct fb_var_screeninfo *var = &info->var;
646 struct drm_crtc *crtc;
647 int ret;
648 int i;
649
650 if (var->pixclock != 0) {
651 DRM_ERROR("PIXEL CLOCK SET\n");
652 return -EINVAL;
653 }
654
655 mutex_lock(&dev->mode_config.mutex);
656 for (i = 0; i < fb_helper->crtc_count; i++) {
657 crtc = fb_helper->crtc_info[i].mode_set.crtc;
658 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
659 if (ret) {
660 mutex_unlock(&dev->mode_config.mutex);
661 return ret;
662 }
663 }
664 mutex_unlock(&dev->mode_config.mutex);
665
666 if (fb_helper->delayed_hotplug) {
667 fb_helper->delayed_hotplug = false;
668 drm_fb_helper_hotplug_event(fb_helper);
669 }
670 return 0;
671 }
672 EXPORT_SYMBOL(drm_fb_helper_set_par);
673
674 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
675 struct fb_info *info)
676 {
677 struct drm_fb_helper *fb_helper = info->par;
678 struct drm_device *dev = fb_helper->dev;
679 struct drm_mode_set *modeset;
680 struct drm_crtc *crtc;
681 int ret = 0;
682 int i;
683
684 mutex_lock(&dev->mode_config.mutex);
685 for (i = 0; i < fb_helper->crtc_count; i++) {
686 crtc = fb_helper->crtc_info[i].mode_set.crtc;
687
688 modeset = &fb_helper->crtc_info[i].mode_set;
689
690 modeset->x = var->xoffset;
691 modeset->y = var->yoffset;
692
693 if (modeset->num_connectors) {
694 ret = crtc->funcs->set_config(modeset);
695 if (!ret) {
696 info->var.xoffset = var->xoffset;
697 info->var.yoffset = var->yoffset;
698 }
699 }
700 }
701 mutex_unlock(&dev->mode_config.mutex);
702 return ret;
703 }
704 EXPORT_SYMBOL(drm_fb_helper_pan_display);
705
706 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
707 int preferred_bpp)
708 {
709 int new_fb = 0;
710 int crtc_count = 0;
711 int i;
712 struct fb_info *info;
713 struct drm_fb_helper_surface_size sizes;
714 int gamma_size = 0;
715
716 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
717 sizes.surface_depth = 24;
718 sizes.surface_bpp = 32;
719 sizes.fb_width = (unsigned)-1;
720 sizes.fb_height = (unsigned)-1;
721
722 /* if driver picks 8 or 16 by default use that
723 for both depth/bpp */
724 if (preferred_bpp != sizes.surface_bpp) {
725 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
726 }
727 /* first up get a count of crtcs now in use and new min/maxes width/heights */
728 for (i = 0; i < fb_helper->connector_count; i++) {
729 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
730 struct drm_cmdline_mode *cmdline_mode;
731
732 cmdline_mode = &fb_helper_conn->cmdline_mode;
733
734 if (cmdline_mode->bpp_specified) {
735 switch (cmdline_mode->bpp) {
736 case 8:
737 sizes.surface_depth = sizes.surface_bpp = 8;
738 break;
739 case 15:
740 sizes.surface_depth = 15;
741 sizes.surface_bpp = 16;
742 break;
743 case 16:
744 sizes.surface_depth = sizes.surface_bpp = 16;
745 break;
746 case 24:
747 sizes.surface_depth = sizes.surface_bpp = 24;
748 break;
749 case 32:
750 sizes.surface_depth = 24;
751 sizes.surface_bpp = 32;
752 break;
753 }
754 break;
755 }
756 }
757
758 crtc_count = 0;
759 for (i = 0; i < fb_helper->crtc_count; i++) {
760 struct drm_display_mode *desired_mode;
761 desired_mode = fb_helper->crtc_info[i].desired_mode;
762
763 if (desired_mode) {
764 if (gamma_size == 0)
765 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
766 if (desired_mode->hdisplay < sizes.fb_width)
767 sizes.fb_width = desired_mode->hdisplay;
768 if (desired_mode->vdisplay < sizes.fb_height)
769 sizes.fb_height = desired_mode->vdisplay;
770 if (desired_mode->hdisplay > sizes.surface_width)
771 sizes.surface_width = desired_mode->hdisplay;
772 if (desired_mode->vdisplay > sizes.surface_height)
773 sizes.surface_height = desired_mode->vdisplay;
774 crtc_count++;
775 }
776 }
777
778 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
779 /* hmm everyone went away - assume VGA cable just fell out
780 and will come back later. */
781 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
782 sizes.fb_width = sizes.surface_width = 1024;
783 sizes.fb_height = sizes.surface_height = 768;
784 }
785
786 /* push down into drivers */
787 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
788 if (new_fb < 0)
789 return new_fb;
790
791 info = fb_helper->fbdev;
792
793 /* set the fb pointer */
794 for (i = 0; i < fb_helper->crtc_count; i++) {
795 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
796 }
797
798 if (new_fb) {
799 info->var.pixclock = 0;
800 if (register_framebuffer(info) < 0) {
801 return -EINVAL;
802 }
803
804 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
805 info->fix.id);
806
807 } else {
808 drm_fb_helper_set_par(info);
809 }
810
811 /* Switch back to kernel console on panic */
812 /* multi card linked list maybe */
813 if (list_empty(&kernel_fb_helper_list)) {
814 printk(KERN_INFO "drm: registered panic notifier\n");
815 atomic_notifier_chain_register(&panic_notifier_list,
816 &paniced);
817 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
818 }
819 if (new_fb)
820 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
821
822 return 0;
823 }
824 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
825
826 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
827 uint32_t depth)
828 {
829 info->fix.type = FB_TYPE_PACKED_PIXELS;
830 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
831 FB_VISUAL_TRUECOLOR;
832 info->fix.mmio_start = 0;
833 info->fix.mmio_len = 0;
834 info->fix.type_aux = 0;
835 info->fix.xpanstep = 1; /* doing it in hw */
836 info->fix.ypanstep = 1; /* doing it in hw */
837 info->fix.ywrapstep = 0;
838 info->fix.accel = FB_ACCEL_NONE;
839 info->fix.type_aux = 0;
840
841 info->fix.line_length = pitch;
842 return;
843 }
844 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
845
846 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
847 uint32_t fb_width, uint32_t fb_height)
848 {
849 struct drm_framebuffer *fb = fb_helper->fb;
850 info->pseudo_palette = fb_helper->pseudo_palette;
851 info->var.xres_virtual = fb->width;
852 info->var.yres_virtual = fb->height;
853 info->var.bits_per_pixel = fb->bits_per_pixel;
854 info->var.accel_flags = FB_ACCELF_TEXT;
855 info->var.xoffset = 0;
856 info->var.yoffset = 0;
857 info->var.activate = FB_ACTIVATE_NOW;
858 info->var.height = -1;
859 info->var.width = -1;
860
861 switch (fb->depth) {
862 case 8:
863 info->var.red.offset = 0;
864 info->var.green.offset = 0;
865 info->var.blue.offset = 0;
866 info->var.red.length = 8; /* 8bit DAC */
867 info->var.green.length = 8;
868 info->var.blue.length = 8;
869 info->var.transp.offset = 0;
870 info->var.transp.length = 0;
871 break;
872 case 15:
873 info->var.red.offset = 10;
874 info->var.green.offset = 5;
875 info->var.blue.offset = 0;
876 info->var.red.length = 5;
877 info->var.green.length = 5;
878 info->var.blue.length = 5;
879 info->var.transp.offset = 15;
880 info->var.transp.length = 1;
881 break;
882 case 16:
883 info->var.red.offset = 11;
884 info->var.green.offset = 5;
885 info->var.blue.offset = 0;
886 info->var.red.length = 5;
887 info->var.green.length = 6;
888 info->var.blue.length = 5;
889 info->var.transp.offset = 0;
890 break;
891 case 24:
892 info->var.red.offset = 16;
893 info->var.green.offset = 8;
894 info->var.blue.offset = 0;
895 info->var.red.length = 8;
896 info->var.green.length = 8;
897 info->var.blue.length = 8;
898 info->var.transp.offset = 0;
899 info->var.transp.length = 0;
900 break;
901 case 32:
902 info->var.red.offset = 16;
903 info->var.green.offset = 8;
904 info->var.blue.offset = 0;
905 info->var.red.length = 8;
906 info->var.green.length = 8;
907 info->var.blue.length = 8;
908 info->var.transp.offset = 24;
909 info->var.transp.length = 8;
910 break;
911 default:
912 break;
913 }
914
915 info->var.xres = fb_width;
916 info->var.yres = fb_height;
917 }
918 EXPORT_SYMBOL(drm_fb_helper_fill_var);
919
920 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
921 uint32_t maxX,
922 uint32_t maxY)
923 {
924 struct drm_connector *connector;
925 int count = 0;
926 int i;
927
928 for (i = 0; i < fb_helper->connector_count; i++) {
929 connector = fb_helper->connector_info[i]->connector;
930 count += connector->funcs->fill_modes(connector, maxX, maxY);
931 }
932
933 return count;
934 }
935
936 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
937 {
938 struct drm_display_mode *mode;
939
940 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
941 if (drm_mode_width(mode) > width ||
942 drm_mode_height(mode) > height)
943 continue;
944 if (mode->type & DRM_MODE_TYPE_PREFERRED)
945 return mode;
946 }
947 return NULL;
948 }
949
950 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
951 {
952 struct drm_cmdline_mode *cmdline_mode;
953 cmdline_mode = &fb_connector->cmdline_mode;
954 return cmdline_mode->specified;
955 }
956
957 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
958 int width, int height)
959 {
960 struct drm_cmdline_mode *cmdline_mode;
961 struct drm_display_mode *mode = NULL;
962
963 cmdline_mode = &fb_helper_conn->cmdline_mode;
964 if (cmdline_mode->specified == false)
965 return mode;
966
967 /* attempt to find a matching mode in the list of modes
968 * we have gotten so far, if not add a CVT mode that conforms
969 */
970 if (cmdline_mode->rb || cmdline_mode->margins)
971 goto create_mode;
972
973 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
974 /* check width/height */
975 if (mode->hdisplay != cmdline_mode->xres ||
976 mode->vdisplay != cmdline_mode->yres)
977 continue;
978
979 if (cmdline_mode->refresh_specified) {
980 if (mode->vrefresh != cmdline_mode->refresh)
981 continue;
982 }
983
984 if (cmdline_mode->interlace) {
985 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
986 continue;
987 }
988 return mode;
989 }
990
991 create_mode:
992 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
993 cmdline_mode);
994 list_add(&mode->head, &fb_helper_conn->connector->modes);
995 return mode;
996 }
997
998 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
999 {
1000 bool enable;
1001
1002 if (strict) {
1003 enable = connector->status == connector_status_connected;
1004 } else {
1005 enable = connector->status != connector_status_disconnected;
1006 }
1007 return enable;
1008 }
1009
1010 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1011 bool *enabled)
1012 {
1013 bool any_enabled = false;
1014 struct drm_connector *connector;
1015 int i = 0;
1016
1017 for (i = 0; i < fb_helper->connector_count; i++) {
1018 connector = fb_helper->connector_info[i]->connector;
1019 enabled[i] = drm_connector_enabled(connector, true);
1020 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1021 enabled[i] ? "yes" : "no");
1022 any_enabled |= enabled[i];
1023 }
1024
1025 if (any_enabled)
1026 return;
1027
1028 for (i = 0; i < fb_helper->connector_count; i++) {
1029 connector = fb_helper->connector_info[i]->connector;
1030 enabled[i] = drm_connector_enabled(connector, false);
1031 }
1032 }
1033
1034 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1035 struct drm_display_mode **modes,
1036 bool *enabled, int width, int height)
1037 {
1038 int count, i, j;
1039 bool can_clone = false;
1040 struct drm_fb_helper_connector *fb_helper_conn;
1041 struct drm_display_mode *dmt_mode, *mode;
1042
1043 /* only contemplate cloning in the single crtc case */
1044 if (fb_helper->crtc_count > 1)
1045 return false;
1046
1047 count = 0;
1048 for (i = 0; i < fb_helper->connector_count; i++) {
1049 if (enabled[i])
1050 count++;
1051 }
1052
1053 /* only contemplate cloning if more than one connector is enabled */
1054 if (count <= 1)
1055 return false;
1056
1057 /* check the command line or if nothing common pick 1024x768 */
1058 can_clone = true;
1059 for (i = 0; i < fb_helper->connector_count; i++) {
1060 if (!enabled[i])
1061 continue;
1062 fb_helper_conn = fb_helper->connector_info[i];
1063 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1064 if (!modes[i]) {
1065 can_clone = false;
1066 break;
1067 }
1068 for (j = 0; j < i; j++) {
1069 if (!enabled[j])
1070 continue;
1071 if (!drm_mode_equal(modes[j], modes[i]))
1072 can_clone = false;
1073 }
1074 }
1075
1076 if (can_clone) {
1077 DRM_DEBUG_KMS("can clone using command line\n");
1078 return true;
1079 }
1080
1081 /* try and find a 1024x768 mode on each connector */
1082 can_clone = true;
1083 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1084
1085 for (i = 0; i < fb_helper->connector_count; i++) {
1086
1087 if (!enabled[i])
1088 continue;
1089
1090 fb_helper_conn = fb_helper->connector_info[i];
1091 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1092 if (drm_mode_equal(mode, dmt_mode))
1093 modes[i] = mode;
1094 }
1095 if (!modes[i])
1096 can_clone = false;
1097 }
1098
1099 if (can_clone) {
1100 DRM_DEBUG_KMS("can clone using 1024x768\n");
1101 return true;
1102 }
1103 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1104 return false;
1105 }
1106
1107 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1108 struct drm_display_mode **modes,
1109 bool *enabled, int width, int height)
1110 {
1111 struct drm_fb_helper_connector *fb_helper_conn;
1112 int i;
1113
1114 for (i = 0; i < fb_helper->connector_count; i++) {
1115 fb_helper_conn = fb_helper->connector_info[i];
1116
1117 if (enabled[i] == false)
1118 continue;
1119
1120 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1121 fb_helper_conn->connector->base.id);
1122
1123 /* got for command line mode first */
1124 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1125 if (!modes[i]) {
1126 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1127 fb_helper_conn->connector->base.id);
1128 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1129 }
1130 /* No preferred modes, pick one off the list */
1131 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1132 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1133 break;
1134 }
1135 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1136 "none");
1137 }
1138 return true;
1139 }
1140
1141 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1142 struct drm_fb_helper_crtc **best_crtcs,
1143 struct drm_display_mode **modes,
1144 int n, int width, int height)
1145 {
1146 int c, o;
1147 struct drm_device *dev = fb_helper->dev;
1148 struct drm_connector *connector;
1149 struct drm_connector_helper_funcs *connector_funcs;
1150 struct drm_encoder *encoder;
1151 struct drm_fb_helper_crtc *best_crtc;
1152 int my_score, best_score, score;
1153 struct drm_fb_helper_crtc **crtcs, *crtc;
1154 struct drm_fb_helper_connector *fb_helper_conn;
1155
1156 if (n == fb_helper->connector_count)
1157 return 0;
1158
1159 fb_helper_conn = fb_helper->connector_info[n];
1160 connector = fb_helper_conn->connector;
1161
1162 best_crtcs[n] = NULL;
1163 best_crtc = NULL;
1164 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1165 if (modes[n] == NULL)
1166 return best_score;
1167
1168 crtcs = kzalloc(dev->mode_config.num_connector *
1169 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1170 if (!crtcs)
1171 return best_score;
1172
1173 my_score = 1;
1174 if (connector->status == connector_status_connected)
1175 my_score++;
1176 if (drm_has_cmdline_mode(fb_helper_conn))
1177 my_score++;
1178 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1179 my_score++;
1180
1181 connector_funcs = connector->helper_private;
1182 encoder = connector_funcs->best_encoder(connector);
1183 if (!encoder)
1184 goto out;
1185
1186 /* select a crtc for this connector and then attempt to configure
1187 remaining connectors */
1188 for (c = 0; c < fb_helper->crtc_count; c++) {
1189 crtc = &fb_helper->crtc_info[c];
1190
1191 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1192 continue;
1193 }
1194
1195 for (o = 0; o < n; o++)
1196 if (best_crtcs[o] == crtc)
1197 break;
1198
1199 if (o < n) {
1200 /* ignore cloning unless only a single crtc */
1201 if (fb_helper->crtc_count > 1)
1202 continue;
1203
1204 if (!drm_mode_equal(modes[o], modes[n]))
1205 continue;
1206 }
1207
1208 crtcs[n] = crtc;
1209 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1210 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1211 width, height);
1212 if (score > best_score) {
1213 best_crtc = crtc;
1214 best_score = score;
1215 memcpy(best_crtcs, crtcs,
1216 dev->mode_config.num_connector *
1217 sizeof(struct drm_fb_helper_crtc *));
1218 }
1219 }
1220 out:
1221 kfree(crtcs);
1222 return best_score;
1223 }
1224
1225 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1226 {
1227 struct drm_device *dev = fb_helper->dev;
1228 struct drm_fb_helper_crtc **crtcs;
1229 struct drm_display_mode **modes;
1230 struct drm_encoder *encoder;
1231 struct drm_mode_set *modeset;
1232 bool *enabled;
1233 int width, height;
1234 int i, ret;
1235
1236 DRM_DEBUG_KMS("\n");
1237
1238 width = dev->mode_config.max_width;
1239 height = dev->mode_config.max_height;
1240
1241 /* clean out all the encoder/crtc combos */
1242 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1243 encoder->crtc = NULL;
1244 }
1245
1246 crtcs = kcalloc(dev->mode_config.num_connector,
1247 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1248 modes = kcalloc(dev->mode_config.num_connector,
1249 sizeof(struct drm_display_mode *), GFP_KERNEL);
1250 enabled = kcalloc(dev->mode_config.num_connector,
1251 sizeof(bool), GFP_KERNEL);
1252
1253 drm_enable_connectors(fb_helper, enabled);
1254
1255 ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1256 if (!ret) {
1257 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1258 if (!ret)
1259 DRM_ERROR("Unable to find initial modes\n");
1260 }
1261
1262 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1263
1264 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1265
1266 /* need to set the modesets up here for use later */
1267 /* fill out the connector<->crtc mappings into the modesets */
1268 for (i = 0; i < fb_helper->crtc_count; i++) {
1269 modeset = &fb_helper->crtc_info[i].mode_set;
1270 modeset->num_connectors = 0;
1271 }
1272
1273 for (i = 0; i < fb_helper->connector_count; i++) {
1274 struct drm_display_mode *mode = modes[i];
1275 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1276 modeset = &fb_crtc->mode_set;
1277
1278 if (mode && fb_crtc) {
1279 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1280 mode->name, fb_crtc->mode_set.crtc->base.id);
1281 fb_crtc->desired_mode = mode;
1282 if (modeset->mode)
1283 drm_mode_destroy(dev, modeset->mode);
1284 modeset->mode = drm_mode_duplicate(dev,
1285 fb_crtc->desired_mode);
1286 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1287 }
1288 }
1289
1290 kfree(crtcs);
1291 kfree(modes);
1292 kfree(enabled);
1293 }
1294
1295 /**
1296 * drm_helper_initial_config - setup a sane initial connector configuration
1297 * @dev: DRM device
1298 *
1299 * LOCKING:
1300 * Called at init time, must take mode config lock.
1301 *
1302 * Scan the CRTCs and connectors and try to put together an initial setup.
1303 * At the moment, this is a cloned configuration across all heads with
1304 * a new framebuffer object as the backing store.
1305 *
1306 * RETURNS:
1307 * Zero if everything went ok, nonzero otherwise.
1308 */
1309 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1310 {
1311 struct drm_device *dev = fb_helper->dev;
1312 int count = 0;
1313
1314 /* disable all the possible outputs/crtcs before entering KMS mode */
1315 drm_helper_disable_unused_functions(fb_helper->dev);
1316
1317 drm_fb_helper_parse_command_line(fb_helper);
1318
1319 count = drm_fb_helper_probe_connector_modes(fb_helper,
1320 dev->mode_config.max_width,
1321 dev->mode_config.max_height);
1322 /*
1323 * we shouldn't end up with no modes here.
1324 */
1325 if (count == 0) {
1326 printk(KERN_INFO "No connectors reported connected with modes\n");
1327 }
1328 drm_setup_crtcs(fb_helper);
1329
1330 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1331 }
1332 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1333
1334 /**
1335 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1336 * probing all the outputs attached to the fb.
1337 * @fb_helper: the drm_fb_helper
1338 *
1339 * LOCKING:
1340 * Called at runtime, must take mode config lock.
1341 *
1342 * Scan the connectors attached to the fb_helper and try to put together a
1343 * setup after *notification of a change in output configuration.
1344 *
1345 * RETURNS:
1346 * 0 on success and a non-zero error code otherwise.
1347 */
1348 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1349 {
1350 struct drm_device *dev = fb_helper->dev;
1351 int count = 0;
1352 u32 max_width, max_height, bpp_sel;
1353 bool bound = false, crtcs_bound = false;
1354 struct drm_crtc *crtc;
1355
1356 if (!fb_helper->fb)
1357 return 0;
1358
1359 mutex_lock(&dev->mode_config.mutex);
1360 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1361 if (crtc->fb)
1362 crtcs_bound = true;
1363 if (crtc->fb == fb_helper->fb)
1364 bound = true;
1365 }
1366
1367 if (!bound && crtcs_bound) {
1368 fb_helper->delayed_hotplug = true;
1369 mutex_unlock(&dev->mode_config.mutex);
1370 return 0;
1371 }
1372 DRM_DEBUG_KMS("\n");
1373
1374 max_width = fb_helper->fb->width;
1375 max_height = fb_helper->fb->height;
1376 bpp_sel = fb_helper->fb->bits_per_pixel;
1377
1378 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1379 max_height);
1380 drm_setup_crtcs(fb_helper);
1381 mutex_unlock(&dev->mode_config.mutex);
1382
1383 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1384 }
1385 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1386
1387 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1388 * but the module doesn't depend on any fb console symbols. At least
1389 * attempt to load fbcon to avoid leaving the system without a usable console.
1390 */
1391 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1392 static int __init drm_fb_helper_modinit(void)
1393 {
1394 const char *name = "fbcon";
1395 struct module *fbcon;
1396
1397 mutex_lock(&module_mutex);
1398 fbcon = find_module(name);
1399 mutex_unlock(&module_mutex);
1400
1401 if (!fbcon)
1402 request_module_nowait(name);
1403 return 0;
1404 }
1405
1406 module_init(drm_fb_helper_modinit);
1407 #endif