Root/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
40MODULE_AUTHOR("David Airlie, Jesse Barnes");
41MODULE_DESCRIPTION("DRM KMS helper");
42MODULE_LICENSE("GPL and additional rights");
43
44static LIST_HEAD(kernel_fb_helper_list);
45
46/* simple single crtc case helper function */
47int 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;
64fail:
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}
72EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
73
74static 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
122static 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
135static 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
149int 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}
178EXPORT_SYMBOL(drm_fb_helper_debug_enter);
179
180/* Find the real fb for a given fb helper CRTC */
181static 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
194int 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}
223EXPORT_SYMBOL(drm_fb_helper_debug_leave);
224
225bool 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}
237EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
238
239bool 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
258int 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}
271EXPORT_SYMBOL(drm_fb_helper_panic);
272
273static 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 */
282void 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}
289EXPORT_SYMBOL(drm_fb_helper_restore);
290
291#ifdef CONFIG_MAGIC_SYSRQ
292static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
293{
294    drm_fb_helper_restore();
295}
296static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
297
298static void drm_fb_helper_sysrq(int dummy1)
299{
300    schedule_work(&drm_fb_helper_restore_work);
301}
302
303static 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
309static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
310#endif
311
312static 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
341int 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}
367EXPORT_SYMBOL(drm_fb_helper_blank);
368
369static 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
384int 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;
425out_free:
426    drm_fb_helper_crtc_free(fb_helper);
427    return -ENOMEM;
428}
429EXPORT_SYMBOL(drm_fb_helper_init);
430
431void 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}
446EXPORT_SYMBOL(drm_fb_helper_fini);
447
448static 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
512int 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}
549EXPORT_SYMBOL(drm_fb_helper_setcmap);
550
551int 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}
641EXPORT_SYMBOL(drm_fb_helper_check_var);
642
643/* this will let fbcon do the mode init */
644int 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}
675EXPORT_SYMBOL(drm_fb_helper_set_par);
676
677int 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}
707EXPORT_SYMBOL(drm_fb_helper_pan_display);
708
709int 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}
827EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
828
829void 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}
847EXPORT_SYMBOL(drm_fb_helper_fill_fix);
848
849void 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}
921EXPORT_SYMBOL(drm_fb_helper_fill_var);
922
923static 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
939static 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
953static 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
960static 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
994create_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
1001static 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
1013static 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
1037static 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
1110static 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
1144static 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    }
1223out:
1224    kfree(crtcs);
1225    return best_score;
1226}
1227
1228static 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 */
1312bool 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}
1335EXPORT_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 */
1351int 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}
1388EXPORT_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)
1395static 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
1409module_init(drm_fb_helper_modinit);
1410#endif
1411

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