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initial commit with v3.6.7
[linux-3.6.7-moxart.git] / drivers / gpu / drm / drm_fb_helper.c
blobf546d1e8af82f10e1cfe1d9c6c66ec9015bc1a68
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 if (crtc->funcs->gamma_set == NULL)
140 return;
141
142 r_base = crtc->gamma_store;
143 g_base = r_base + crtc->gamma_size;
144 b_base = g_base + crtc->gamma_size;
145
146 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
147 }
148
149 int drm_fb_helper_debug_enter(struct fb_info *info)
150 {
151 struct drm_fb_helper *helper = info->par;
152 struct drm_crtc_helper_funcs *funcs;
153 int i;
154
155 if (list_empty(&kernel_fb_helper_list))
156 return false;
157
158 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
159 for (i = 0; i < helper->crtc_count; i++) {
160 struct drm_mode_set *mode_set =
161 &helper->crtc_info[i].mode_set;
162
163 if (!mode_set->crtc->enabled)
164 continue;
165
166 funcs = mode_set->crtc->helper_private;
167 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
168 funcs->mode_set_base_atomic(mode_set->crtc,
169 mode_set->fb,
170 mode_set->x,
171 mode_set->y,
172 ENTER_ATOMIC_MODE_SET);
173 }
174 }
175
176 return 0;
177 }
178 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
179
180 /* Find the real fb for a given fb helper CRTC */
181 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
182 {
183 struct drm_device *dev = crtc->dev;
184 struct drm_crtc *c;
185
186 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
187 if (crtc->base.id == c->base.id)
188 return c->fb;
189 }
190
191 return NULL;
192 }
193
194 int drm_fb_helper_debug_leave(struct fb_info *info)
195 {
196 struct drm_fb_helper *helper = info->par;
197 struct drm_crtc *crtc;
198 struct drm_crtc_helper_funcs *funcs;
199 struct drm_framebuffer *fb;
200 int i;
201
202 for (i = 0; i < helper->crtc_count; i++) {
203 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
204 crtc = mode_set->crtc;
205 funcs = crtc->helper_private;
206 fb = drm_mode_config_fb(crtc);
207
208 if (!crtc->enabled)
209 continue;
210
211 if (!fb) {
212 DRM_ERROR("no fb to restore??\n");
213 continue;
214 }
215
216 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
217 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
218 crtc->y, LEAVE_ATOMIC_MODE_SET);
219 }
220
221 return 0;
222 }
223 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
224
225 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
226 {
227 bool error = false;
228 int i, ret;
229 for (i = 0; i < fb_helper->crtc_count; i++) {
230 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
231 ret = mode_set->crtc->funcs->set_config(mode_set);
232 if (ret)
233 error = true;
234 }
235 return error;
236 }
237 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
238
239 bool drm_fb_helper_force_kernel_mode(void)
240 {
241 bool ret, error = false;
242 struct drm_fb_helper *helper;
243
244 if (list_empty(&kernel_fb_helper_list))
245 return false;
246
247 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
248 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
249 continue;
250
251 ret = drm_fb_helper_restore_fbdev_mode(helper);
252 if (ret)
253 error = true;
254 }
255 return error;
256 }
257
258 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
259 void *panic_str)
260 {
261 /*
262 * It's a waste of time and effort to switch back to text console
263 * if the kernel should reboot before panic messages can be seen.
264 */
265 if (panic_timeout < 0)
266 return 0;
267
268 printk(KERN_ERR "panic occurred, switching back to text console\n");
269 return drm_fb_helper_force_kernel_mode();
270 }
271 EXPORT_SYMBOL(drm_fb_helper_panic);
272
273 static struct notifier_block paniced = {
274 .notifier_call = drm_fb_helper_panic,
275 };
276
277 /**
278 * drm_fb_helper_restore - restore the framebuffer console (kernel) config
279 *
280 * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
281 */
282 void drm_fb_helper_restore(void)
283 {
284 bool ret;
285 ret = drm_fb_helper_force_kernel_mode();
286 if (ret == true)
287 DRM_ERROR("Failed to restore crtc configuration\n");
288 }
289 EXPORT_SYMBOL(drm_fb_helper_restore);
290
291 #ifdef CONFIG_MAGIC_SYSRQ
292 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
293 {
294 drm_fb_helper_restore();
295 }
296 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
297
298 static void drm_fb_helper_sysrq(int dummy1)
299 {
300 schedule_work(&drm_fb_helper_restore_work);
301 }
302
303 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
304 .handler = drm_fb_helper_sysrq,
305 .help_msg = "force-fb(V)",
306 .action_msg = "Restore framebuffer console",
307 };
308 #else
309 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
310 #endif
311
312 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
313 {
314 struct drm_fb_helper *fb_helper = info->par;
315 struct drm_device *dev = fb_helper->dev;
316 struct drm_crtc *crtc;
317 struct drm_connector *connector;
318 int i, j;
319
320 /*
321 * For each CRTC in this fb, turn the connectors on/off.
322 */
323 mutex_lock(&dev->mode_config.mutex);
324 for (i = 0; i < fb_helper->crtc_count; i++) {
325 crtc = fb_helper->crtc_info[i].mode_set.crtc;
326
327 if (!crtc->enabled)
328 continue;
329
330 /* Walk the connectors & encoders on this fb turning them on/off */
331 for (j = 0; j < fb_helper->connector_count; j++) {
332 connector = fb_helper->connector_info[j]->connector;
333 drm_helper_connector_dpms(connector, dpms_mode);
334 drm_connector_property_set_value(connector,
335 dev->mode_config.dpms_property, dpms_mode);
336 }
337 }
338 mutex_unlock(&dev->mode_config.mutex);
339 }
340
341 int drm_fb_helper_blank(int blank, struct fb_info *info)
342 {
343 switch (blank) {
344 /* Display: On; HSync: On, VSync: On */
345 case FB_BLANK_UNBLANK:
346 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
347 break;
348 /* Display: Off; HSync: On, VSync: On */
349 case FB_BLANK_NORMAL:
350 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
351 break;
352 /* Display: Off; HSync: Off, VSync: On */
353 case FB_BLANK_HSYNC_SUSPEND:
354 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
355 break;
356 /* Display: Off; HSync: On, VSync: Off */
357 case FB_BLANK_VSYNC_SUSPEND:
358 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
359 break;
360 /* Display: Off; HSync: Off, VSync: Off */
361 case FB_BLANK_POWERDOWN:
362 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
363 break;
364 }
365 return 0;
366 }
367 EXPORT_SYMBOL(drm_fb_helper_blank);
368
369 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
370 {
371 int i;
372
373 for (i = 0; i < helper->connector_count; i++)
374 kfree(helper->connector_info[i]);
375 kfree(helper->connector_info);
376 for (i = 0; i < helper->crtc_count; i++) {
377 kfree(helper->crtc_info[i].mode_set.connectors);
378 if (helper->crtc_info[i].mode_set.mode)
379 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
380 }
381 kfree(helper->crtc_info);
382 }
383
384 int drm_fb_helper_init(struct drm_device *dev,
385 struct drm_fb_helper *fb_helper,
386 int crtc_count, int max_conn_count)
387 {
388 struct drm_crtc *crtc;
389 int i;
390
391 fb_helper->dev = dev;
392
393 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
394
395 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
396 if (!fb_helper->crtc_info)
397 return -ENOMEM;
398
399 fb_helper->crtc_count = crtc_count;
400 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
401 if (!fb_helper->connector_info) {
402 kfree(fb_helper->crtc_info);
403 return -ENOMEM;
404 }
405 fb_helper->connector_count = 0;
406
407 for (i = 0; i < crtc_count; i++) {
408 fb_helper->crtc_info[i].mode_set.connectors =
409 kcalloc(max_conn_count,
410 sizeof(struct drm_connector *),
411 GFP_KERNEL);
412
413 if (!fb_helper->crtc_info[i].mode_set.connectors)
414 goto out_free;
415 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
416 }
417
418 i = 0;
419 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
420 fb_helper->crtc_info[i].mode_set.crtc = crtc;
421 i++;
422 }
423
424 return 0;
425 out_free:
426 drm_fb_helper_crtc_free(fb_helper);
427 return -ENOMEM;
428 }
429 EXPORT_SYMBOL(drm_fb_helper_init);
430
431 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
432 {
433 if (!list_empty(&fb_helper->kernel_fb_list)) {
434 list_del(&fb_helper->kernel_fb_list);
435 if (list_empty(&kernel_fb_helper_list)) {
436 printk(KERN_INFO "drm: unregistered panic notifier\n");
437 atomic_notifier_chain_unregister(&panic_notifier_list,
438 &paniced);
439 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
440 }
441 }
442
443 drm_fb_helper_crtc_free(fb_helper);
444
445 }
446 EXPORT_SYMBOL(drm_fb_helper_fini);
447
448 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
449 u16 blue, u16 regno, struct fb_info *info)
450 {
451 struct drm_fb_helper *fb_helper = info->par;
452 struct drm_framebuffer *fb = fb_helper->fb;
453 int pindex;
454
455 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
456 u32 *palette;
457 u32 value;
458 /* place color in psuedopalette */
459 if (regno > 16)
460 return -EINVAL;
461 palette = (u32 *)info->pseudo_palette;
462 red >>= (16 - info->var.red.length);
463 green >>= (16 - info->var.green.length);
464 blue >>= (16 - info->var.blue.length);
465 value = (red << info->var.red.offset) |
466 (green << info->var.green.offset) |
467 (blue << info->var.blue.offset);
468 if (info->var.transp.length > 0) {
469 u32 mask = (1 << info->var.transp.length) - 1;
470 mask <<= info->var.transp.offset;
471 value |= mask;
472 }
473 palette[regno] = value;
474 return 0;
475 }
476
477 pindex = regno;
478
479 if (fb->bits_per_pixel == 16) {
480 pindex = regno << 3;
481
482 if (fb->depth == 16 && regno > 63)
483 return -EINVAL;
484 if (fb->depth == 15 && regno > 31)
485 return -EINVAL;
486
487 if (fb->depth == 16) {
488 u16 r, g, b;
489 int i;
490 if (regno < 32) {
491 for (i = 0; i < 8; i++)
492 fb_helper->funcs->gamma_set(crtc, red,
493 green, blue, pindex + i);
494 }
495
496 fb_helper->funcs->gamma_get(crtc, &r,
497 &g, &b,
498 pindex >> 1);
499
500 for (i = 0; i < 4; i++)
501 fb_helper->funcs->gamma_set(crtc, r,
502 green, b,
503 (pindex >> 1) + i);
504 }
505 }
506
507 if (fb->depth != 16)
508 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
509 return 0;
510 }
511
512 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
513 {
514 struct drm_fb_helper *fb_helper = info->par;
515 struct drm_crtc_helper_funcs *crtc_funcs;
516 u16 *red, *green, *blue, *transp;
517 struct drm_crtc *crtc;
518 int i, j, rc = 0;
519 int start;
520
521 for (i = 0; i < fb_helper->crtc_count; i++) {
522 crtc = fb_helper->crtc_info[i].mode_set.crtc;
523 crtc_funcs = crtc->helper_private;
524
525 red = cmap->red;
526 green = cmap->green;
527 blue = cmap->blue;
528 transp = cmap->transp;
529 start = cmap->start;
530
531 for (j = 0; j < cmap->len; j++) {
532 u16 hred, hgreen, hblue, htransp = 0xffff;
533
534 hred = *red++;
535 hgreen = *green++;
536 hblue = *blue++;
537
538 if (transp)
539 htransp = *transp++;
540
541 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
542 if (rc)
543 return rc;
544 }
545 crtc_funcs->load_lut(crtc);
546 }
547 return rc;
548 }
549 EXPORT_SYMBOL(drm_fb_helper_setcmap);
550
551 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
552 struct fb_info *info)
553 {
554 struct drm_fb_helper *fb_helper = info->par;
555 struct drm_framebuffer *fb = fb_helper->fb;
556 int depth;
557
558 if (var->pixclock != 0 || in_dbg_master())
559 return -EINVAL;
560
561 /* Need to resize the fb object !!! */
562 if (var->bits_per_pixel > fb->bits_per_pixel ||
563 var->xres > fb->width || var->yres > fb->height ||
564 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
565 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
566 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
567 var->xres, var->yres, var->bits_per_pixel,
568 var->xres_virtual, var->yres_virtual,
569 fb->width, fb->height, fb->bits_per_pixel);
570 return -EINVAL;
571 }
572
573 switch (var->bits_per_pixel) {
574 case 16:
575 depth = (var->green.length == 6) ? 16 : 15;
576 break;
577 case 32:
578 depth = (var->transp.length > 0) ? 32 : 24;
579 break;
580 default:
581 depth = var->bits_per_pixel;
582 break;
583 }
584
585 switch (depth) {
586 case 8:
587 var->red.offset = 0;
588 var->green.offset = 0;
589 var->blue.offset = 0;
590 var->red.length = 8;
591 var->green.length = 8;
592 var->blue.length = 8;
593 var->transp.length = 0;
594 var->transp.offset = 0;
595 break;
596 case 15:
597 var->red.offset = 10;
598 var->green.offset = 5;
599 var->blue.offset = 0;
600 var->red.length = 5;
601 var->green.length = 5;
602 var->blue.length = 5;
603 var->transp.length = 1;
604 var->transp.offset = 15;
605 break;
606 case 16:
607 var->red.offset = 11;
608 var->green.offset = 5;
609 var->blue.offset = 0;
610 var->red.length = 5;
611 var->green.length = 6;
612 var->blue.length = 5;
613 var->transp.length = 0;
614 var->transp.offset = 0;
615 break;
616 case 24:
617 var->red.offset = 16;
618 var->green.offset = 8;
619 var->blue.offset = 0;
620 var->red.length = 8;
621 var->green.length = 8;
622 var->blue.length = 8;
623 var->transp.length = 0;
624 var->transp.offset = 0;
625 break;
626 case 32:
627 var->red.offset = 16;
628 var->green.offset = 8;
629 var->blue.offset = 0;
630 var->red.length = 8;
631 var->green.length = 8;
632 var->blue.length = 8;
633 var->transp.length = 8;
634 var->transp.offset = 24;
635 break;
636 default:
637 return -EINVAL;
638 }
639 return 0;
640 }
641 EXPORT_SYMBOL(drm_fb_helper_check_var);
642
643 /* this will let fbcon do the mode init */
644 int drm_fb_helper_set_par(struct fb_info *info)
645 {
646 struct drm_fb_helper *fb_helper = info->par;
647 struct drm_device *dev = fb_helper->dev;
648 struct fb_var_screeninfo *var = &info->var;
649 struct drm_crtc *crtc;
650 int ret;
651 int i;
652
653 if (var->pixclock != 0) {
654 DRM_ERROR("PIXEL CLOCK SET\n");
655 return -EINVAL;
656 }
657
658 mutex_lock(&dev->mode_config.mutex);
659 for (i = 0; i < fb_helper->crtc_count; i++) {
660 crtc = fb_helper->crtc_info[i].mode_set.crtc;
661 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
662 if (ret) {
663 mutex_unlock(&dev->mode_config.mutex);
664 return ret;
665 }
666 }
667 mutex_unlock(&dev->mode_config.mutex);
668
669 if (fb_helper->delayed_hotplug) {
670 fb_helper->delayed_hotplug = false;
671 drm_fb_helper_hotplug_event(fb_helper);
672 }
673 return 0;
674 }
675 EXPORT_SYMBOL(drm_fb_helper_set_par);
676
677 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
678 struct fb_info *info)
679 {
680 struct drm_fb_helper *fb_helper = info->par;
681 struct drm_device *dev = fb_helper->dev;
682 struct drm_mode_set *modeset;
683 struct drm_crtc *crtc;
684 int ret = 0;
685 int i;
686
687 mutex_lock(&dev->mode_config.mutex);
688 for (i = 0; i < fb_helper->crtc_count; i++) {
689 crtc = fb_helper->crtc_info[i].mode_set.crtc;
690
691 modeset = &fb_helper->crtc_info[i].mode_set;
692
693 modeset->x = var->xoffset;
694 modeset->y = var->yoffset;
695
696 if (modeset->num_connectors) {
697 ret = crtc->funcs->set_config(modeset);
698 if (!ret) {
699 info->var.xoffset = var->xoffset;
700 info->var.yoffset = var->yoffset;
701 }
702 }
703 }
704 mutex_unlock(&dev->mode_config.mutex);
705 return ret;
706 }
707 EXPORT_SYMBOL(drm_fb_helper_pan_display);
708
709 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
710 int preferred_bpp)
711 {
712 int new_fb = 0;
713 int crtc_count = 0;
714 int i;
715 struct fb_info *info;
716 struct drm_fb_helper_surface_size sizes;
717 int gamma_size = 0;
718
719 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
720 sizes.surface_depth = 24;
721 sizes.surface_bpp = 32;
722 sizes.fb_width = (unsigned)-1;
723 sizes.fb_height = (unsigned)-1;
724
725 /* if driver picks 8 or 16 by default use that
726 for both depth/bpp */
727 if (preferred_bpp != sizes.surface_bpp) {
728 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
729 }
730 /* first up get a count of crtcs now in use and new min/maxes width/heights */
731 for (i = 0; i < fb_helper->connector_count; i++) {
732 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
733 struct drm_cmdline_mode *cmdline_mode;
734
735 cmdline_mode = &fb_helper_conn->cmdline_mode;
736
737 if (cmdline_mode->bpp_specified) {
738 switch (cmdline_mode->bpp) {
739 case 8:
740 sizes.surface_depth = sizes.surface_bpp = 8;
741 break;
742 case 15:
743 sizes.surface_depth = 15;
744 sizes.surface_bpp = 16;
745 break;
746 case 16:
747 sizes.surface_depth = sizes.surface_bpp = 16;
748 break;
749 case 24:
750 sizes.surface_depth = sizes.surface_bpp = 24;
751 break;
752 case 32:
753 sizes.surface_depth = 24;
754 sizes.surface_bpp = 32;
755 break;
756 }
757 break;
758 }
759 }
760
761 crtc_count = 0;
762 for (i = 0; i < fb_helper->crtc_count; i++) {
763 struct drm_display_mode *desired_mode;
764 desired_mode = fb_helper->crtc_info[i].desired_mode;
765
766 if (desired_mode) {
767 if (gamma_size == 0)
768 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
769 if (desired_mode->hdisplay < sizes.fb_width)
770 sizes.fb_width = desired_mode->hdisplay;
771 if (desired_mode->vdisplay < sizes.fb_height)
772 sizes.fb_height = desired_mode->vdisplay;
773 if (desired_mode->hdisplay > sizes.surface_width)
774 sizes.surface_width = desired_mode->hdisplay;
775 if (desired_mode->vdisplay > sizes.surface_height)
776 sizes.surface_height = desired_mode->vdisplay;
777 crtc_count++;
778 }
779 }
780
781 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
782 /* hmm everyone went away - assume VGA cable just fell out
783 and will come back later. */
784 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
785 sizes.fb_width = sizes.surface_width = 1024;
786 sizes.fb_height = sizes.surface_height = 768;
787 }
788
789 /* push down into drivers */
790 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
791 if (new_fb < 0)
792 return new_fb;
793
794 info = fb_helper->fbdev;
795
796 /* set the fb pointer */
797 for (i = 0; i < fb_helper->crtc_count; i++) {
798 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
799 }
800
801 if (new_fb) {
802 info->var.pixclock = 0;
803 if (register_framebuffer(info) < 0) {
804 return -EINVAL;
805 }
806
807 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
808 info->fix.id);
809
810 } else {
811 drm_fb_helper_set_par(info);
812 }
813
814 /* Switch back to kernel console on panic */
815 /* multi card linked list maybe */
816 if (list_empty(&kernel_fb_helper_list)) {
817 printk(KERN_INFO "drm: registered panic notifier\n");
818 atomic_notifier_chain_register(&panic_notifier_list,
819 &paniced);
820 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
821 }
822 if (new_fb)
823 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
824
825 return 0;
826 }
827 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
828
829 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
830 uint32_t depth)
831 {
832 info->fix.type = FB_TYPE_PACKED_PIXELS;
833 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
834 FB_VISUAL_TRUECOLOR;
835 info->fix.mmio_start = 0;
836 info->fix.mmio_len = 0;
837 info->fix.type_aux = 0;
838 info->fix.xpanstep = 1; /* doing it in hw */
839 info->fix.ypanstep = 1; /* doing it in hw */
840 info->fix.ywrapstep = 0;
841 info->fix.accel = FB_ACCEL_NONE;
842 info->fix.type_aux = 0;
843
844 info->fix.line_length = pitch;
845 return;
846 }
847 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
848
849 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
850 uint32_t fb_width, uint32_t fb_height)
851 {
852 struct drm_framebuffer *fb = fb_helper->fb;
853 info->pseudo_palette = fb_helper->pseudo_palette;
854 info->var.xres_virtual = fb->width;
855 info->var.yres_virtual = fb->height;
856 info->var.bits_per_pixel = fb->bits_per_pixel;
857 info->var.accel_flags = FB_ACCELF_TEXT;
858 info->var.xoffset = 0;
859 info->var.yoffset = 0;
860 info->var.activate = FB_ACTIVATE_NOW;
861 info->var.height = -1;
862 info->var.width = -1;
863
864 switch (fb->depth) {
865 case 8:
866 info->var.red.offset = 0;
867 info->var.green.offset = 0;
868 info->var.blue.offset = 0;
869 info->var.red.length = 8; /* 8bit DAC */
870 info->var.green.length = 8;
871 info->var.blue.length = 8;
872 info->var.transp.offset = 0;
873 info->var.transp.length = 0;
874 break;
875 case 15:
876 info->var.red.offset = 10;
877 info->var.green.offset = 5;
878 info->var.blue.offset = 0;
879 info->var.red.length = 5;
880 info->var.green.length = 5;
881 info->var.blue.length = 5;
882 info->var.transp.offset = 15;
883 info->var.transp.length = 1;
884 break;
885 case 16:
886 info->var.red.offset = 11;
887 info->var.green.offset = 5;
888 info->var.blue.offset = 0;
889 info->var.red.length = 5;
890 info->var.green.length = 6;
891 info->var.blue.length = 5;
892 info->var.transp.offset = 0;
893 break;
894 case 24:
895 info->var.red.offset = 16;
896 info->var.green.offset = 8;
897 info->var.blue.offset = 0;
898 info->var.red.length = 8;
899 info->var.green.length = 8;
900 info->var.blue.length = 8;
901 info->var.transp.offset = 0;
902 info->var.transp.length = 0;
903 break;
904 case 32:
905 info->var.red.offset = 16;
906 info->var.green.offset = 8;
907 info->var.blue.offset = 0;
908 info->var.red.length = 8;
909 info->var.green.length = 8;
910 info->var.blue.length = 8;
911 info->var.transp.offset = 24;
912 info->var.transp.length = 8;
913 break;
914 default:
915 break;
916 }
917
918 info->var.xres = fb_width;
919 info->var.yres = fb_height;
920 }
921 EXPORT_SYMBOL(drm_fb_helper_fill_var);
922
923 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
924 uint32_t maxX,
925 uint32_t maxY)
926 {
927 struct drm_connector *connector;
928 int count = 0;
929 int i;
930
931 for (i = 0; i < fb_helper->connector_count; i++) {
932 connector = fb_helper->connector_info[i]->connector;
933 count += connector->funcs->fill_modes(connector, maxX, maxY);
934 }
935
936 return count;
937 }
938
939 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
940 {
941 struct drm_display_mode *mode;
942
943 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
944 if (drm_mode_width(mode) > width ||
945 drm_mode_height(mode) > height)
946 continue;
947 if (mode->type & DRM_MODE_TYPE_PREFERRED)
948 return mode;
949 }
950 return NULL;
951 }
952
953 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
954 {
955 struct drm_cmdline_mode *cmdline_mode;
956 cmdline_mode = &fb_connector->cmdline_mode;
957 return cmdline_mode->specified;
958 }
959
960 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
961 int width, int height)
962 {
963 struct drm_cmdline_mode *cmdline_mode;
964 struct drm_display_mode *mode = NULL;
965
966 cmdline_mode = &fb_helper_conn->cmdline_mode;
967 if (cmdline_mode->specified == false)
968 return mode;
969
970 /* attempt to find a matching mode in the list of modes
971 * we have gotten so far, if not add a CVT mode that conforms
972 */
973 if (cmdline_mode->rb || cmdline_mode->margins)
974 goto create_mode;
975
976 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
977 /* check width/height */
978 if (mode->hdisplay != cmdline_mode->xres ||
979 mode->vdisplay != cmdline_mode->yres)
980 continue;
981
982 if (cmdline_mode->refresh_specified) {
983 if (mode->vrefresh != cmdline_mode->refresh)
984 continue;
985 }
986
987 if (cmdline_mode->interlace) {
988 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
989 continue;
990 }
991 return mode;
992 }
993
994 create_mode:
995 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
996 cmdline_mode);
997 list_add(&mode->head, &fb_helper_conn->connector->modes);
998 return mode;
999 }
1000
1001 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1002 {
1003 bool enable;
1004
1005 if (strict) {
1006 enable = connector->status == connector_status_connected;
1007 } else {
1008 enable = connector->status != connector_status_disconnected;
1009 }
1010 return enable;
1011 }
1012
1013 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1014 bool *enabled)
1015 {
1016 bool any_enabled = false;
1017 struct drm_connector *connector;
1018 int i = 0;
1019
1020 for (i = 0; i < fb_helper->connector_count; i++) {
1021 connector = fb_helper->connector_info[i]->connector;
1022 enabled[i] = drm_connector_enabled(connector, true);
1023 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1024 enabled[i] ? "yes" : "no");
1025 any_enabled |= enabled[i];
1026 }
1027
1028 if (any_enabled)
1029 return;
1030
1031 for (i = 0; i < fb_helper->connector_count; i++) {
1032 connector = fb_helper->connector_info[i]->connector;
1033 enabled[i] = drm_connector_enabled(connector, false);
1034 }
1035 }
1036
1037 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1038 struct drm_display_mode **modes,
1039 bool *enabled, int width, int height)
1040 {
1041 int count, i, j;
1042 bool can_clone = false;
1043 struct drm_fb_helper_connector *fb_helper_conn;
1044 struct drm_display_mode *dmt_mode, *mode;
1045
1046 /* only contemplate cloning in the single crtc case */
1047 if (fb_helper->crtc_count > 1)
1048 return false;
1049
1050 count = 0;
1051 for (i = 0; i < fb_helper->connector_count; i++) {
1052 if (enabled[i])
1053 count++;
1054 }
1055
1056 /* only contemplate cloning if more than one connector is enabled */
1057 if (count <= 1)
1058 return false;
1059
1060 /* check the command line or if nothing common pick 1024x768 */
1061 can_clone = true;
1062 for (i = 0; i < fb_helper->connector_count; i++) {
1063 if (!enabled[i])
1064 continue;
1065 fb_helper_conn = fb_helper->connector_info[i];
1066 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1067 if (!modes[i]) {
1068 can_clone = false;
1069 break;
1070 }
1071 for (j = 0; j < i; j++) {
1072 if (!enabled[j])
1073 continue;
1074 if (!drm_mode_equal(modes[j], modes[i]))
1075 can_clone = false;
1076 }
1077 }
1078
1079 if (can_clone) {
1080 DRM_DEBUG_KMS("can clone using command line\n");
1081 return true;
1082 }
1083
1084 /* try and find a 1024x768 mode on each connector */
1085 can_clone = true;
1086 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1087
1088 for (i = 0; i < fb_helper->connector_count; i++) {
1089
1090 if (!enabled[i])
1091 continue;
1092
1093 fb_helper_conn = fb_helper->connector_info[i];
1094 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1095 if (drm_mode_equal(mode, dmt_mode))
1096 modes[i] = mode;
1097 }
1098 if (!modes[i])
1099 can_clone = false;
1100 }
1101
1102 if (can_clone) {
1103 DRM_DEBUG_KMS("can clone using 1024x768\n");
1104 return true;
1105 }
1106 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1107 return false;
1108 }
1109
1110 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1111 struct drm_display_mode **modes,
1112 bool *enabled, int width, int height)
1113 {
1114 struct drm_fb_helper_connector *fb_helper_conn;
1115 int i;
1116
1117 for (i = 0; i < fb_helper->connector_count; i++) {
1118 fb_helper_conn = fb_helper->connector_info[i];
1119
1120 if (enabled[i] == false)
1121 continue;
1122
1123 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1124 fb_helper_conn->connector->base.id);
1125
1126 /* got for command line mode first */
1127 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1128 if (!modes[i]) {
1129 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1130 fb_helper_conn->connector->base.id);
1131 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1132 }
1133 /* No preferred modes, pick one off the list */
1134 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1135 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1136 break;
1137 }
1138 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1139 "none");
1140 }
1141 return true;
1142 }
1143
1144 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1145 struct drm_fb_helper_crtc **best_crtcs,
1146 struct drm_display_mode **modes,
1147 int n, int width, int height)
1148 {
1149 int c, o;
1150 struct drm_device *dev = fb_helper->dev;
1151 struct drm_connector *connector;
1152 struct drm_connector_helper_funcs *connector_funcs;
1153 struct drm_encoder *encoder;
1154 struct drm_fb_helper_crtc *best_crtc;
1155 int my_score, best_score, score;
1156 struct drm_fb_helper_crtc **crtcs, *crtc;
1157 struct drm_fb_helper_connector *fb_helper_conn;
1158
1159 if (n == fb_helper->connector_count)
1160 return 0;
1161
1162 fb_helper_conn = fb_helper->connector_info[n];
1163 connector = fb_helper_conn->connector;
1164
1165 best_crtcs[n] = NULL;
1166 best_crtc = NULL;
1167 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1168 if (modes[n] == NULL)
1169 return best_score;
1170
1171 crtcs = kzalloc(dev->mode_config.num_connector *
1172 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1173 if (!crtcs)
1174 return best_score;
1175
1176 my_score = 1;
1177 if (connector->status == connector_status_connected)
1178 my_score++;
1179 if (drm_has_cmdline_mode(fb_helper_conn))
1180 my_score++;
1181 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1182 my_score++;
1183
1184 connector_funcs = connector->helper_private;
1185 encoder = connector_funcs->best_encoder(connector);
1186 if (!encoder)
1187 goto out;
1188
1189 /* select a crtc for this connector and then attempt to configure
1190 remaining connectors */
1191 for (c = 0; c < fb_helper->crtc_count; c++) {
1192 crtc = &fb_helper->crtc_info[c];
1193
1194 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1195 continue;
1196 }
1197
1198 for (o = 0; o < n; o++)
1199 if (best_crtcs[o] == crtc)
1200 break;
1201
1202 if (o < n) {
1203 /* ignore cloning unless only a single crtc */
1204 if (fb_helper->crtc_count > 1)
1205 continue;
1206
1207 if (!drm_mode_equal(modes[o], modes[n]))
1208 continue;
1209 }
1210
1211 crtcs[n] = crtc;
1212 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1213 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1214 width, height);
1215 if (score > best_score) {
1216 best_crtc = crtc;
1217 best_score = score;
1218 memcpy(best_crtcs, crtcs,
1219 dev->mode_config.num_connector *
1220 sizeof(struct drm_fb_helper_crtc *));
1221 }
1222 }
1223 out:
1224 kfree(crtcs);
1225 return best_score;
1226 }
1227
1228 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1229 {
1230 struct drm_device *dev = fb_helper->dev;
1231 struct drm_fb_helper_crtc **crtcs;
1232 struct drm_display_mode **modes;
1233 struct drm_encoder *encoder;
1234 struct drm_mode_set *modeset;
1235 bool *enabled;
1236 int width, height;
1237 int i, ret;
1238
1239 DRM_DEBUG_KMS("\n");
1240
1241 width = dev->mode_config.max_width;
1242 height = dev->mode_config.max_height;
1243
1244 /* clean out all the encoder/crtc combos */
1245 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1246 encoder->crtc = NULL;
1247 }
1248
1249 crtcs = kcalloc(dev->mode_config.num_connector,
1250 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1251 modes = kcalloc(dev->mode_config.num_connector,
1252 sizeof(struct drm_display_mode *), GFP_KERNEL);
1253 enabled = kcalloc(dev->mode_config.num_connector,
1254 sizeof(bool), GFP_KERNEL);
1255
1256 drm_enable_connectors(fb_helper, enabled);
1257
1258 ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1259 if (!ret) {
1260 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1261 if (!ret)
1262 DRM_ERROR("Unable to find initial modes\n");
1263 }
1264
1265 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1266
1267 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1268
1269 /* need to set the modesets up here for use later */
1270 /* fill out the connector<->crtc mappings into the modesets */
1271 for (i = 0; i < fb_helper->crtc_count; i++) {
1272 modeset = &fb_helper->crtc_info[i].mode_set;
1273 modeset->num_connectors = 0;
1274 }
1275
1276 for (i = 0; i < fb_helper->connector_count; i++) {
1277 struct drm_display_mode *mode = modes[i];
1278 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1279 modeset = &fb_crtc->mode_set;
1280
1281 if (mode && fb_crtc) {
1282 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1283 mode->name, fb_crtc->mode_set.crtc->base.id);
1284 fb_crtc->desired_mode = mode;
1285 if (modeset->mode)
1286 drm_mode_destroy(dev, modeset->mode);
1287 modeset->mode = drm_mode_duplicate(dev,
1288 fb_crtc->desired_mode);
1289 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1290 }
1291 }
1292
1293 kfree(crtcs);
1294 kfree(modes);
1295 kfree(enabled);
1296 }
1297
1298 /**
1299 * drm_helper_initial_config - setup a sane initial connector configuration
1300 * @dev: DRM device
1301 *
1302 * LOCKING:
1303 * Called at init time, must take mode config lock.
1304 *
1305 * Scan the CRTCs and connectors and try to put together an initial setup.
1306 * At the moment, this is a cloned configuration across all heads with
1307 * a new framebuffer object as the backing store.
1308 *
1309 * RETURNS:
1310 * Zero if everything went ok, nonzero otherwise.
1311 */
1312 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1313 {
1314 struct drm_device *dev = fb_helper->dev;
1315 int count = 0;
1316
1317 /* disable all the possible outputs/crtcs before entering KMS mode */
1318 drm_helper_disable_unused_functions(fb_helper->dev);
1319
1320 drm_fb_helper_parse_command_line(fb_helper);
1321
1322 count = drm_fb_helper_probe_connector_modes(fb_helper,
1323 dev->mode_config.max_width,
1324 dev->mode_config.max_height);
1325 /*
1326 * we shouldn't end up with no modes here.
1327 */
1328 if (count == 0) {
1329 printk(KERN_INFO "No connectors reported connected with modes\n");
1330 }
1331 drm_setup_crtcs(fb_helper);
1332
1333 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1334 }
1335 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1336
1337 /**
1338 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1339 * probing all the outputs attached to the fb.
1340 * @fb_helper: the drm_fb_helper
1341 *
1342 * LOCKING:
1343 * Called at runtime, must take mode config lock.
1344 *
1345 * Scan the connectors attached to the fb_helper and try to put together a
1346 * setup after *notification of a change in output configuration.
1347 *
1348 * RETURNS:
1349 * 0 on success and a non-zero error code otherwise.
1350 */
1351 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1352 {
1353 struct drm_device *dev = fb_helper->dev;
1354 int count = 0;
1355 u32 max_width, max_height, bpp_sel;
1356 int bound = 0, crtcs_bound = 0;
1357 struct drm_crtc *crtc;
1358
1359 if (!fb_helper->fb)
1360 return 0;
1361
1362 mutex_lock(&dev->mode_config.mutex);
1363 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1364 if (crtc->fb)
1365 crtcs_bound++;
1366 if (crtc->fb == fb_helper->fb)
1367 bound++;
1368 }
1369
1370 if (bound < crtcs_bound) {
1371 fb_helper->delayed_hotplug = true;
1372 mutex_unlock(&dev->mode_config.mutex);
1373 return 0;
1374 }
1375 DRM_DEBUG_KMS("\n");
1376
1377 max_width = fb_helper->fb->width;
1378 max_height = fb_helper->fb->height;
1379 bpp_sel = fb_helper->fb->bits_per_pixel;
1380
1381 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1382 max_height);
1383 drm_setup_crtcs(fb_helper);
1384 mutex_unlock(&dev->mode_config.mutex);
1385
1386 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1387 }
1388 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1389
1390 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1391 * but the module doesn't depend on any fb console symbols. At least
1392 * attempt to load fbcon to avoid leaving the system without a usable console.
1393 */
1394 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1395 static int __init drm_fb_helper_modinit(void)
1396 {
1397 const char *name = "fbcon";
1398 struct module *fbcon;
1399
1400 mutex_lock(&module_mutex);
1401 fbcon = find_module(name);
1402 mutex_unlock(&module_mutex);
1403
1404 if (!fbcon)
1405 request_module_nowait(name);
1406 return 0;
1407 }
1408
1409 module_init(drm_fb_helper_modinit);
1410 #endif
Linux ARM platform port for MOXA ART SoC