2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
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.
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
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
42 static LIST_HEAD(kernel_fb_helper_list);
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independently from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a three-step process with drm_fb_helper_init(),
53 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
54 * Drivers with fancier requirements than the default behaviour can override the
55 * second step with their own code. Teardown is done with drm_fb_helper_fini().
57 * At runtime drivers should restore the fbdev console by calling
58 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
59 * should also notify the fb helper code from updates to the output
60 * configuration by calling drm_fb_helper_hotplug_event(). For easier
61 * integration with the output polling code in drm_crtc_helper.c the modeset
62 * code provides a ->output_poll_changed callback.
64 * All other functions exported by the fb helper library can be used to
65 * implement the fbdev driver interface by the driver.
69 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
71 * @fb_helper: fbdev initialized with drm_fb_helper_init
73 * This functions adds all the available connectors for use with the given
74 * fb_helper. This is a separate step to allow drivers to freely assign
75 * connectors to the fbdev, e.g. if some are reserved for special purposes or
76 * not adequate to be used for the fbcon.
78 * Since this is part of the initial setup before the fbdev is published, no
79 * locking is required.
81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
83 struct drm_device *dev = fb_helper->dev;
84 struct drm_connector *connector;
87 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
88 struct drm_fb_helper_connector *fb_helper_connector;
90 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
91 if (!fb_helper_connector)
94 fb_helper_connector->connector = connector;
95 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
99 for (i = 0; i < fb_helper->connector_count; i++) {
100 kfree(fb_helper->connector_info[i]);
101 fb_helper->connector_info[i] = NULL;
103 fb_helper->connector_count = 0;
106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
110 struct drm_fb_helper_connector *fb_helper_conn;
113 for (i = 0; i < fb_helper->connector_count; i++) {
114 struct drm_cmdline_mode *mode;
115 struct drm_connector *connector;
118 fb_helper_conn = fb_helper->connector_info[i];
119 connector = fb_helper_conn->connector;
120 mode = &fb_helper_conn->cmdline_mode;
122 /* do something on return - turn off connector maybe */
123 if (fb_get_options(connector->name, &option))
126 if (drm_mode_parse_command_line_for_connector(option,
131 switch (mode->force) {
135 case DRM_FORCE_ON_DIGITAL:
144 DRM_INFO("forcing %s connector %s\n",
146 connector->force = mode->force;
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
151 mode->xres, mode->yres,
152 mode->refresh_specified ? mode->refresh : 60,
153 mode->rb ? " reduced blanking" : "",
154 mode->margins ? " with margins" : "",
155 mode->interlace ? " interlaced" : "");
162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
164 uint16_t *r_base, *g_base, *b_base;
167 if (helper->funcs->gamma_get == NULL)
170 r_base = crtc->gamma_store;
171 g_base = r_base + crtc->gamma_size;
172 b_base = g_base + crtc->gamma_size;
174 for (i = 0; i < crtc->gamma_size; i++)
175 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
180 uint16_t *r_base, *g_base, *b_base;
182 if (crtc->funcs->gamma_set == NULL)
185 r_base = crtc->gamma_store;
186 g_base = r_base + crtc->gamma_size;
187 b_base = g_base + crtc->gamma_size;
189 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
193 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
194 * @info: fbdev registered by the helper
196 int drm_fb_helper_debug_enter(struct fb_info *info)
198 struct drm_fb_helper *helper = info->par;
199 struct drm_crtc_helper_funcs *funcs;
202 if (list_empty(&kernel_fb_helper_list))
205 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
206 for (i = 0; i < helper->crtc_count; i++) {
207 struct drm_mode_set *mode_set =
208 &helper->crtc_info[i].mode_set;
210 if (!mode_set->crtc->enabled)
213 funcs = mode_set->crtc->helper_private;
214 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
215 funcs->mode_set_base_atomic(mode_set->crtc,
219 ENTER_ATOMIC_MODE_SET);
225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
227 /* Find the real fb for a given fb helper CRTC */
228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
230 struct drm_device *dev = crtc->dev;
233 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
234 if (crtc->base.id == c->base.id)
235 return c->primary->fb;
242 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
243 * @info: fbdev registered by the helper
245 int drm_fb_helper_debug_leave(struct fb_info *info)
247 struct drm_fb_helper *helper = info->par;
248 struct drm_crtc *crtc;
249 struct drm_crtc_helper_funcs *funcs;
250 struct drm_framebuffer *fb;
253 for (i = 0; i < helper->crtc_count; i++) {
254 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
255 crtc = mode_set->crtc;
256 funcs = crtc->helper_private;
257 fb = drm_mode_config_fb(crtc);
263 DRM_ERROR("no fb to restore??\n");
267 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
268 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
269 crtc->y, LEAVE_ATOMIC_MODE_SET);
274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
276 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
278 struct drm_device *dev = fb_helper->dev;
279 struct drm_plane *plane;
283 drm_warn_on_modeset_not_all_locked(dev);
285 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
286 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
287 drm_plane_force_disable(plane);
289 for (i = 0; i < fb_helper->crtc_count; i++) {
290 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
291 struct drm_crtc *crtc = mode_set->crtc;
294 if (crtc->funcs->cursor_set) {
295 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
300 ret = drm_mode_set_config_internal(mode_set);
307 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
308 * @fb_helper: fbcon to restore
310 * This should be called from driver's drm ->lastclose callback
311 * when implementing an fbcon on top of kms using this helper. This ensures that
312 * the user isn't greeted with a black screen when e.g. X dies.
314 * Use this variant if you need to bypass locking (panic), or already
315 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
317 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
319 return restore_fbdev_mode(fb_helper);
323 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
324 * @fb_helper: fbcon to restore
326 * This should be called from driver's drm ->lastclose callback
327 * when implementing an fbcon on top of kms using this helper. This ensures that
328 * the user isn't greeted with a black screen when e.g. X dies.
330 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
332 struct drm_device *dev = fb_helper->dev;
334 drm_modeset_lock_all(dev);
335 ret = restore_fbdev_mode(fb_helper);
336 drm_modeset_unlock_all(dev);
339 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
342 * restore fbcon display for all kms driver's using this helper, used for sysrq
343 * and panic handling.
345 static bool drm_fb_helper_force_kernel_mode(void)
347 bool ret, error = false;
348 struct drm_fb_helper *helper;
350 if (list_empty(&kernel_fb_helper_list))
353 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
354 struct drm_device *dev = helper->dev;
356 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
359 /* NOTE: we use lockless flag below to avoid grabbing other
360 * modeset locks. So just trylock the underlying mutex
363 if (!mutex_trylock(&dev->mode_config.mutex)) {
368 ret = drm_fb_helper_restore_fbdev_mode(helper);
372 mutex_unlock(&dev->mode_config.mutex);
377 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
381 * It's a waste of time and effort to switch back to text console
382 * if the kernel should reboot before panic messages can be seen.
384 if (panic_timeout < 0)
387 pr_err("panic occurred, switching back to text console\n");
388 return drm_fb_helper_force_kernel_mode();
391 static struct notifier_block paniced = {
392 .notifier_call = drm_fb_helper_panic,
395 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
397 struct drm_device *dev = fb_helper->dev;
398 struct drm_crtc *crtc;
399 int bound = 0, crtcs_bound = 0;
401 /* Sometimes user space wants everything disabled, so don't steal the
402 * display if there's a master. */
403 if (dev->primary->master)
406 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
407 if (crtc->primary->fb)
409 if (crtc->primary->fb == fb_helper->fb)
413 if (bound < crtcs_bound)
419 #ifdef CONFIG_MAGIC_SYSRQ
420 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
423 ret = drm_fb_helper_force_kernel_mode();
425 DRM_ERROR("Failed to restore crtc configuration\n");
427 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
429 static void drm_fb_helper_sysrq(int dummy1)
431 schedule_work(&drm_fb_helper_restore_work);
434 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
435 .handler = drm_fb_helper_sysrq,
436 .help_msg = "force-fb(V)",
437 .action_msg = "Restore framebuffer console",
440 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
443 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
445 struct drm_fb_helper *fb_helper = info->par;
446 struct drm_device *dev = fb_helper->dev;
447 struct drm_crtc *crtc;
448 struct drm_connector *connector;
452 * fbdev->blank can be called from irq context in case of a panic.
453 * Since we already have our own special panic handler which will
454 * restore the fbdev console mode completely, just bail out early.
456 if (oops_in_progress)
460 * For each CRTC in this fb, turn the connectors on/off.
462 drm_modeset_lock_all(dev);
463 if (!drm_fb_helper_is_bound(fb_helper)) {
464 drm_modeset_unlock_all(dev);
468 for (i = 0; i < fb_helper->crtc_count; i++) {
469 crtc = fb_helper->crtc_info[i].mode_set.crtc;
474 /* Walk the connectors & encoders on this fb turning them on/off */
475 for (j = 0; j < fb_helper->connector_count; j++) {
476 connector = fb_helper->connector_info[j]->connector;
477 connector->funcs->dpms(connector, dpms_mode);
478 drm_object_property_set_value(&connector->base,
479 dev->mode_config.dpms_property, dpms_mode);
482 drm_modeset_unlock_all(dev);
486 * drm_fb_helper_blank - implementation for ->fb_blank
487 * @blank: desired blanking state
488 * @info: fbdev registered by the helper
490 int drm_fb_helper_blank(int blank, struct fb_info *info)
493 /* Display: On; HSync: On, VSync: On */
494 case FB_BLANK_UNBLANK:
495 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
497 /* Display: Off; HSync: On, VSync: On */
498 case FB_BLANK_NORMAL:
499 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
501 /* Display: Off; HSync: Off, VSync: On */
502 case FB_BLANK_HSYNC_SUSPEND:
503 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
505 /* Display: Off; HSync: On, VSync: Off */
506 case FB_BLANK_VSYNC_SUSPEND:
507 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
509 /* Display: Off; HSync: Off, VSync: Off */
510 case FB_BLANK_POWERDOWN:
511 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
516 EXPORT_SYMBOL(drm_fb_helper_blank);
518 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
522 for (i = 0; i < helper->connector_count; i++)
523 kfree(helper->connector_info[i]);
524 kfree(helper->connector_info);
525 for (i = 0; i < helper->crtc_count; i++) {
526 kfree(helper->crtc_info[i].mode_set.connectors);
527 if (helper->crtc_info[i].mode_set.mode)
528 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
530 kfree(helper->crtc_info);
534 * drm_fb_helper_init - initialize a drm_fb_helper structure
536 * @fb_helper: driver-allocated fbdev helper structure to initialize
537 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
538 * @max_conn_count: max connector count
540 * This allocates the structures for the fbdev helper with the given limits.
541 * Note that this won't yet touch the hardware (through the driver interfaces)
542 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
543 * to allow driver writes more control over the exact init sequence.
545 * Drivers must set fb_helper->funcs before calling
546 * drm_fb_helper_initial_config().
549 * Zero if everything went ok, nonzero otherwise.
551 int drm_fb_helper_init(struct drm_device *dev,
552 struct drm_fb_helper *fb_helper,
553 int crtc_count, int max_conn_count)
555 struct drm_crtc *crtc;
561 fb_helper->dev = dev;
563 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
565 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
566 if (!fb_helper->crtc_info)
569 fb_helper->crtc_count = crtc_count;
570 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
571 if (!fb_helper->connector_info) {
572 kfree(fb_helper->crtc_info);
575 fb_helper->connector_count = 0;
577 for (i = 0; i < crtc_count; i++) {
578 fb_helper->crtc_info[i].mode_set.connectors =
579 kcalloc(max_conn_count,
580 sizeof(struct drm_connector *),
583 if (!fb_helper->crtc_info[i].mode_set.connectors)
585 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
589 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
590 fb_helper->crtc_info[i].mode_set.crtc = crtc;
596 drm_fb_helper_crtc_free(fb_helper);
599 EXPORT_SYMBOL(drm_fb_helper_init);
601 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
603 if (!list_empty(&fb_helper->kernel_fb_list)) {
604 list_del(&fb_helper->kernel_fb_list);
605 if (list_empty(&kernel_fb_helper_list)) {
606 pr_info("drm: unregistered panic notifier\n");
607 atomic_notifier_chain_unregister(&panic_notifier_list,
609 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
613 drm_fb_helper_crtc_free(fb_helper);
616 EXPORT_SYMBOL(drm_fb_helper_fini);
618 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
619 u16 blue, u16 regno, struct fb_info *info)
621 struct drm_fb_helper *fb_helper = info->par;
622 struct drm_framebuffer *fb = fb_helper->fb;
625 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
628 /* place color in psuedopalette */
631 palette = (u32 *)info->pseudo_palette;
632 red >>= (16 - info->var.red.length);
633 green >>= (16 - info->var.green.length);
634 blue >>= (16 - info->var.blue.length);
635 value = (red << info->var.red.offset) |
636 (green << info->var.green.offset) |
637 (blue << info->var.blue.offset);
638 if (info->var.transp.length > 0) {
639 u32 mask = (1 << info->var.transp.length) - 1;
640 mask <<= info->var.transp.offset;
643 palette[regno] = value;
648 * The driver really shouldn't advertise pseudo/directcolor
649 * visuals if it can't deal with the palette.
651 if (WARN_ON(!fb_helper->funcs->gamma_set ||
652 !fb_helper->funcs->gamma_get))
657 if (fb->bits_per_pixel == 16) {
660 if (fb->depth == 16 && regno > 63)
662 if (fb->depth == 15 && regno > 31)
665 if (fb->depth == 16) {
669 for (i = 0; i < 8; i++)
670 fb_helper->funcs->gamma_set(crtc, red,
671 green, blue, pindex + i);
674 fb_helper->funcs->gamma_get(crtc, &r,
678 for (i = 0; i < 4; i++)
679 fb_helper->funcs->gamma_set(crtc, r,
686 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
691 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
693 * @info: fbdev registered by the helper
695 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
697 struct drm_fb_helper *fb_helper = info->par;
698 struct drm_device *dev = fb_helper->dev;
699 struct drm_crtc_helper_funcs *crtc_funcs;
700 u16 *red, *green, *blue, *transp;
701 struct drm_crtc *crtc;
705 drm_modeset_lock_all(dev);
706 if (!drm_fb_helper_is_bound(fb_helper)) {
707 drm_modeset_unlock_all(dev);
711 for (i = 0; i < fb_helper->crtc_count; i++) {
712 crtc = fb_helper->crtc_info[i].mode_set.crtc;
713 crtc_funcs = crtc->helper_private;
718 transp = cmap->transp;
721 for (j = 0; j < cmap->len; j++) {
722 u16 hred, hgreen, hblue, htransp = 0xffff;
731 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
735 if (crtc_funcs->load_lut)
736 crtc_funcs->load_lut(crtc);
739 drm_modeset_unlock_all(dev);
742 EXPORT_SYMBOL(drm_fb_helper_setcmap);
745 * drm_fb_helper_check_var - implementation for ->fb_check_var
746 * @var: screeninfo to check
747 * @info: fbdev registered by the helper
749 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
750 struct fb_info *info)
752 struct drm_fb_helper *fb_helper = info->par;
753 struct drm_framebuffer *fb = fb_helper->fb;
756 if (var->pixclock != 0 || in_dbg_master())
759 /* Need to resize the fb object !!! */
760 if (var->bits_per_pixel > fb->bits_per_pixel ||
761 var->xres > fb->width || var->yres > fb->height ||
762 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
763 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
764 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
765 var->xres, var->yres, var->bits_per_pixel,
766 var->xres_virtual, var->yres_virtual,
767 fb->width, fb->height, fb->bits_per_pixel);
771 switch (var->bits_per_pixel) {
773 depth = (var->green.length == 6) ? 16 : 15;
776 depth = (var->transp.length > 0) ? 32 : 24;
779 depth = var->bits_per_pixel;
786 var->green.offset = 0;
787 var->blue.offset = 0;
789 var->green.length = 8;
790 var->blue.length = 8;
791 var->transp.length = 0;
792 var->transp.offset = 0;
795 var->red.offset = 10;
796 var->green.offset = 5;
797 var->blue.offset = 0;
799 var->green.length = 5;
800 var->blue.length = 5;
801 var->transp.length = 1;
802 var->transp.offset = 15;
805 var->red.offset = 11;
806 var->green.offset = 5;
807 var->blue.offset = 0;
809 var->green.length = 6;
810 var->blue.length = 5;
811 var->transp.length = 0;
812 var->transp.offset = 0;
815 var->red.offset = 16;
816 var->green.offset = 8;
817 var->blue.offset = 0;
819 var->green.length = 8;
820 var->blue.length = 8;
821 var->transp.length = 0;
822 var->transp.offset = 0;
825 var->red.offset = 16;
826 var->green.offset = 8;
827 var->blue.offset = 0;
829 var->green.length = 8;
830 var->blue.length = 8;
831 var->transp.length = 8;
832 var->transp.offset = 24;
839 EXPORT_SYMBOL(drm_fb_helper_check_var);
842 * drm_fb_helper_set_par - implementation for ->fb_set_par
843 * @info: fbdev registered by the helper
845 * This will let fbcon do the mode init and is called at initialization time by
846 * the fbdev core when registering the driver, and later on through the hotplug
849 int drm_fb_helper_set_par(struct fb_info *info)
851 struct drm_fb_helper *fb_helper = info->par;
852 struct fb_var_screeninfo *var = &info->var;
854 if (var->pixclock != 0) {
855 DRM_ERROR("PIXEL CLOCK SET\n");
859 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
861 if (fb_helper->delayed_hotplug) {
862 fb_helper->delayed_hotplug = false;
863 drm_fb_helper_hotplug_event(fb_helper);
867 EXPORT_SYMBOL(drm_fb_helper_set_par);
870 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
871 * @var: updated screen information
872 * @info: fbdev registered by the helper
874 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
875 struct fb_info *info)
877 struct drm_fb_helper *fb_helper = info->par;
878 struct drm_device *dev = fb_helper->dev;
879 struct drm_mode_set *modeset;
883 drm_modeset_lock_all(dev);
884 if (!drm_fb_helper_is_bound(fb_helper)) {
885 drm_modeset_unlock_all(dev);
889 for (i = 0; i < fb_helper->crtc_count; i++) {
890 modeset = &fb_helper->crtc_info[i].mode_set;
892 modeset->x = var->xoffset;
893 modeset->y = var->yoffset;
895 if (modeset->num_connectors) {
896 ret = drm_mode_set_config_internal(modeset);
898 info->var.xoffset = var->xoffset;
899 info->var.yoffset = var->yoffset;
903 drm_modeset_unlock_all(dev);
906 EXPORT_SYMBOL(drm_fb_helper_pan_display);
909 * Allocates the backing storage and sets up the fbdev info structure through
910 * the ->fb_probe callback and then registers the fbdev and sets up the panic
913 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
919 struct fb_info *info;
920 struct drm_fb_helper_surface_size sizes;
923 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
924 sizes.surface_depth = 24;
925 sizes.surface_bpp = 32;
926 sizes.fb_width = (unsigned)-1;
927 sizes.fb_height = (unsigned)-1;
929 /* if driver picks 8 or 16 by default use that
930 for both depth/bpp */
931 if (preferred_bpp != sizes.surface_bpp)
932 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
934 /* first up get a count of crtcs now in use and new min/maxes width/heights */
935 for (i = 0; i < fb_helper->connector_count; i++) {
936 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
937 struct drm_cmdline_mode *cmdline_mode;
939 cmdline_mode = &fb_helper_conn->cmdline_mode;
941 if (cmdline_mode->bpp_specified) {
942 switch (cmdline_mode->bpp) {
944 sizes.surface_depth = sizes.surface_bpp = 8;
947 sizes.surface_depth = 15;
948 sizes.surface_bpp = 16;
951 sizes.surface_depth = sizes.surface_bpp = 16;
954 sizes.surface_depth = sizes.surface_bpp = 24;
957 sizes.surface_depth = 24;
958 sizes.surface_bpp = 32;
966 for (i = 0; i < fb_helper->crtc_count; i++) {
967 struct drm_display_mode *desired_mode;
968 desired_mode = fb_helper->crtc_info[i].desired_mode;
972 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
973 if (desired_mode->hdisplay < sizes.fb_width)
974 sizes.fb_width = desired_mode->hdisplay;
975 if (desired_mode->vdisplay < sizes.fb_height)
976 sizes.fb_height = desired_mode->vdisplay;
977 if (desired_mode->hdisplay > sizes.surface_width)
978 sizes.surface_width = desired_mode->hdisplay;
979 if (desired_mode->vdisplay > sizes.surface_height)
980 sizes.surface_height = desired_mode->vdisplay;
985 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
986 /* hmm everyone went away - assume VGA cable just fell out
987 and will come back later. */
988 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
989 sizes.fb_width = sizes.surface_width = 1024;
990 sizes.fb_height = sizes.surface_height = 768;
993 /* push down into drivers */
994 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
998 info = fb_helper->fbdev;
1001 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1002 * events, but at init time drm_setup_crtcs needs to be called before
1003 * the fb is allocated (since we need to figure out the desired size of
1004 * the fb before we can allocate it ...). Hence we need to fix things up
1007 for (i = 0; i < fb_helper->crtc_count; i++)
1008 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1009 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1012 info->var.pixclock = 0;
1013 if (register_framebuffer(info) < 0)
1016 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1017 info->node, info->fix.id);
1019 /* Switch back to kernel console on panic */
1020 /* multi card linked list maybe */
1021 if (list_empty(&kernel_fb_helper_list)) {
1022 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1023 atomic_notifier_chain_register(&panic_notifier_list,
1025 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1028 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1034 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1035 * @info: fbdev registered by the helper
1036 * @pitch: desired pitch
1037 * @depth: desired depth
1039 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1040 * fbdev emulations. Drivers which support acceleration methods which impose
1041 * additional constraints need to set up their own limits.
1043 * Drivers should call this (or their equivalent setup code) from their
1044 * ->fb_probe callback.
1046 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1049 info->fix.type = FB_TYPE_PACKED_PIXELS;
1050 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1051 FB_VISUAL_TRUECOLOR;
1052 info->fix.mmio_start = 0;
1053 info->fix.mmio_len = 0;
1054 info->fix.type_aux = 0;
1055 info->fix.xpanstep = 1; /* doing it in hw */
1056 info->fix.ypanstep = 1; /* doing it in hw */
1057 info->fix.ywrapstep = 0;
1058 info->fix.accel = FB_ACCEL_NONE;
1059 info->fix.type_aux = 0;
1061 info->fix.line_length = pitch;
1064 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1067 * drm_fb_helper_fill_var - initalizes variable fbdev information
1068 * @info: fbdev instance to set up
1069 * @fb_helper: fb helper instance to use as template
1070 * @fb_width: desired fb width
1071 * @fb_height: desired fb height
1073 * Sets up the variable fbdev metainformation from the given fb helper instance
1074 * and the drm framebuffer allocated in fb_helper->fb.
1076 * Drivers should call this (or their equivalent setup code) from their
1077 * ->fb_probe callback after having allocated the fbdev backing
1078 * storage framebuffer.
1080 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1081 uint32_t fb_width, uint32_t fb_height)
1083 struct drm_framebuffer *fb = fb_helper->fb;
1084 info->pseudo_palette = fb_helper->pseudo_palette;
1085 info->var.xres_virtual = fb->width;
1086 info->var.yres_virtual = fb->height;
1087 info->var.bits_per_pixel = fb->bits_per_pixel;
1088 info->var.accel_flags = FB_ACCELF_TEXT;
1089 info->var.xoffset = 0;
1090 info->var.yoffset = 0;
1091 info->var.activate = FB_ACTIVATE_NOW;
1092 info->var.height = -1;
1093 info->var.width = -1;
1095 switch (fb->depth) {
1097 info->var.red.offset = 0;
1098 info->var.green.offset = 0;
1099 info->var.blue.offset = 0;
1100 info->var.red.length = 8; /* 8bit DAC */
1101 info->var.green.length = 8;
1102 info->var.blue.length = 8;
1103 info->var.transp.offset = 0;
1104 info->var.transp.length = 0;
1107 info->var.red.offset = 10;
1108 info->var.green.offset = 5;
1109 info->var.blue.offset = 0;
1110 info->var.red.length = 5;
1111 info->var.green.length = 5;
1112 info->var.blue.length = 5;
1113 info->var.transp.offset = 15;
1114 info->var.transp.length = 1;
1117 info->var.red.offset = 11;
1118 info->var.green.offset = 5;
1119 info->var.blue.offset = 0;
1120 info->var.red.length = 5;
1121 info->var.green.length = 6;
1122 info->var.blue.length = 5;
1123 info->var.transp.offset = 0;
1126 info->var.red.offset = 16;
1127 info->var.green.offset = 8;
1128 info->var.blue.offset = 0;
1129 info->var.red.length = 8;
1130 info->var.green.length = 8;
1131 info->var.blue.length = 8;
1132 info->var.transp.offset = 0;
1133 info->var.transp.length = 0;
1136 info->var.red.offset = 16;
1137 info->var.green.offset = 8;
1138 info->var.blue.offset = 0;
1139 info->var.red.length = 8;
1140 info->var.green.length = 8;
1141 info->var.blue.length = 8;
1142 info->var.transp.offset = 24;
1143 info->var.transp.length = 8;
1149 info->var.xres = fb_width;
1150 info->var.yres = fb_height;
1152 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1154 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1158 struct drm_connector *connector;
1162 for (i = 0; i < fb_helper->connector_count; i++) {
1163 connector = fb_helper->connector_info[i]->connector;
1164 count += connector->funcs->fill_modes(connector, maxX, maxY);
1170 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1172 struct drm_display_mode *mode;
1174 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1175 if (mode->hdisplay > width ||
1176 mode->vdisplay > height)
1178 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1183 EXPORT_SYMBOL(drm_has_preferred_mode);
1185 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1187 struct drm_cmdline_mode *cmdline_mode;
1188 cmdline_mode = &fb_connector->cmdline_mode;
1189 return cmdline_mode->specified;
1192 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1193 int width, int height)
1195 struct drm_cmdline_mode *cmdline_mode;
1196 struct drm_display_mode *mode = NULL;
1197 bool prefer_non_interlace;
1199 cmdline_mode = &fb_helper_conn->cmdline_mode;
1200 if (cmdline_mode->specified == false)
1203 /* attempt to find a matching mode in the list of modes
1204 * we have gotten so far, if not add a CVT mode that conforms
1206 if (cmdline_mode->rb || cmdline_mode->margins)
1209 prefer_non_interlace = !cmdline_mode->interlace;
1211 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1212 /* check width/height */
1213 if (mode->hdisplay != cmdline_mode->xres ||
1214 mode->vdisplay != cmdline_mode->yres)
1217 if (cmdline_mode->refresh_specified) {
1218 if (mode->vrefresh != cmdline_mode->refresh)
1222 if (cmdline_mode->interlace) {
1223 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1225 } else if (prefer_non_interlace) {
1226 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1232 if (prefer_non_interlace) {
1233 prefer_non_interlace = false;
1238 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1240 list_add(&mode->head, &fb_helper_conn->connector->modes);
1243 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1245 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1250 enable = connector->status == connector_status_connected;
1252 enable = connector->status != connector_status_disconnected;
1257 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1260 bool any_enabled = false;
1261 struct drm_connector *connector;
1264 for (i = 0; i < fb_helper->connector_count; i++) {
1265 connector = fb_helper->connector_info[i]->connector;
1266 enabled[i] = drm_connector_enabled(connector, true);
1267 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1268 enabled[i] ? "yes" : "no");
1269 any_enabled |= enabled[i];
1275 for (i = 0; i < fb_helper->connector_count; i++) {
1276 connector = fb_helper->connector_info[i]->connector;
1277 enabled[i] = drm_connector_enabled(connector, false);
1281 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1282 struct drm_display_mode **modes,
1283 bool *enabled, int width, int height)
1286 bool can_clone = false;
1287 struct drm_fb_helper_connector *fb_helper_conn;
1288 struct drm_display_mode *dmt_mode, *mode;
1290 /* only contemplate cloning in the single crtc case */
1291 if (fb_helper->crtc_count > 1)
1295 for (i = 0; i < fb_helper->connector_count; i++) {
1300 /* only contemplate cloning if more than one connector is enabled */
1304 /* check the command line or if nothing common pick 1024x768 */
1306 for (i = 0; i < fb_helper->connector_count; i++) {
1309 fb_helper_conn = fb_helper->connector_info[i];
1310 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1315 for (j = 0; j < i; j++) {
1318 if (!drm_mode_equal(modes[j], modes[i]))
1324 DRM_DEBUG_KMS("can clone using command line\n");
1328 /* try and find a 1024x768 mode on each connector */
1330 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1332 for (i = 0; i < fb_helper->connector_count; i++) {
1337 fb_helper_conn = fb_helper->connector_info[i];
1338 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1339 if (drm_mode_equal(mode, dmt_mode))
1347 DRM_DEBUG_KMS("can clone using 1024x768\n");
1350 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1354 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1355 struct drm_display_mode **modes,
1356 bool *enabled, int width, int height)
1358 struct drm_fb_helper_connector *fb_helper_conn;
1361 for (i = 0; i < fb_helper->connector_count; i++) {
1362 fb_helper_conn = fb_helper->connector_info[i];
1364 if (enabled[i] == false)
1367 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1368 fb_helper_conn->connector->base.id);
1370 /* got for command line mode first */
1371 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1373 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1374 fb_helper_conn->connector->base.id);
1375 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1377 /* No preferred modes, pick one off the list */
1378 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1379 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1382 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1388 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1389 struct drm_fb_helper_crtc **best_crtcs,
1390 struct drm_display_mode **modes,
1391 int n, int width, int height)
1394 struct drm_device *dev = fb_helper->dev;
1395 struct drm_connector *connector;
1396 struct drm_connector_helper_funcs *connector_funcs;
1397 struct drm_encoder *encoder;
1398 int my_score, best_score, score;
1399 struct drm_fb_helper_crtc **crtcs, *crtc;
1400 struct drm_fb_helper_connector *fb_helper_conn;
1402 if (n == fb_helper->connector_count)
1405 fb_helper_conn = fb_helper->connector_info[n];
1406 connector = fb_helper_conn->connector;
1408 best_crtcs[n] = NULL;
1409 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1410 if (modes[n] == NULL)
1413 crtcs = kzalloc(dev->mode_config.num_connector *
1414 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1419 if (connector->status == connector_status_connected)
1421 if (drm_has_cmdline_mode(fb_helper_conn))
1423 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1426 connector_funcs = connector->helper_private;
1427 encoder = connector_funcs->best_encoder(connector);
1431 /* select a crtc for this connector and then attempt to configure
1432 remaining connectors */
1433 for (c = 0; c < fb_helper->crtc_count; c++) {
1434 crtc = &fb_helper->crtc_info[c];
1436 if ((encoder->possible_crtcs & (1 << c)) == 0)
1439 for (o = 0; o < n; o++)
1440 if (best_crtcs[o] == crtc)
1444 /* ignore cloning unless only a single crtc */
1445 if (fb_helper->crtc_count > 1)
1448 if (!drm_mode_equal(modes[o], modes[n]))
1453 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1454 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1456 if (score > best_score) {
1458 memcpy(best_crtcs, crtcs,
1459 dev->mode_config.num_connector *
1460 sizeof(struct drm_fb_helper_crtc *));
1468 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1470 struct drm_device *dev = fb_helper->dev;
1471 struct drm_fb_helper_crtc **crtcs;
1472 struct drm_display_mode **modes;
1473 struct drm_mode_set *modeset;
1478 DRM_DEBUG_KMS("\n");
1480 width = dev->mode_config.max_width;
1481 height = dev->mode_config.max_height;
1483 crtcs = kcalloc(dev->mode_config.num_connector,
1484 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1485 modes = kcalloc(dev->mode_config.num_connector,
1486 sizeof(struct drm_display_mode *), GFP_KERNEL);
1487 enabled = kcalloc(dev->mode_config.num_connector,
1488 sizeof(bool), GFP_KERNEL);
1489 if (!crtcs || !modes || !enabled) {
1490 DRM_ERROR("Memory allocation failed\n");
1495 drm_enable_connectors(fb_helper, enabled);
1497 if (!(fb_helper->funcs->initial_config &&
1498 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1499 enabled, width, height))) {
1500 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1501 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1503 if (!drm_target_cloned(fb_helper,
1504 modes, enabled, width, height) &&
1505 !drm_target_preferred(fb_helper,
1506 modes, enabled, width, height))
1507 DRM_ERROR("Unable to find initial modes\n");
1509 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1512 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1515 /* need to set the modesets up here for use later */
1516 /* fill out the connector<->crtc mappings into the modesets */
1517 for (i = 0; i < fb_helper->crtc_count; i++) {
1518 modeset = &fb_helper->crtc_info[i].mode_set;
1519 modeset->num_connectors = 0;
1523 for (i = 0; i < fb_helper->connector_count; i++) {
1524 struct drm_display_mode *mode = modes[i];
1525 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1526 modeset = &fb_crtc->mode_set;
1528 if (mode && fb_crtc) {
1529 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1530 mode->name, fb_crtc->mode_set.crtc->base.id);
1531 fb_crtc->desired_mode = mode;
1533 drm_mode_destroy(dev, modeset->mode);
1534 modeset->mode = drm_mode_duplicate(dev,
1535 fb_crtc->desired_mode);
1536 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1537 modeset->fb = fb_helper->fb;
1541 /* Clear out any old modes if there are no more connected outputs. */
1542 for (i = 0; i < fb_helper->crtc_count; i++) {
1543 modeset = &fb_helper->crtc_info[i].mode_set;
1544 if (modeset->num_connectors == 0) {
1545 BUG_ON(modeset->fb);
1546 BUG_ON(modeset->num_connectors);
1548 drm_mode_destroy(dev, modeset->mode);
1549 modeset->mode = NULL;
1559 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1560 * @fb_helper: fb_helper device struct
1561 * @bpp_sel: bpp value to use for the framebuffer configuration
1563 * Scans the CRTCs and connectors and tries to put together an initial setup.
1564 * At the moment, this is a cloned configuration across all heads with
1565 * a new framebuffer object as the backing store.
1567 * Note that this also registers the fbdev and so allows userspace to call into
1568 * the driver through the fbdev interfaces.
1570 * This function will call down into the ->fb_probe callback to let
1571 * the driver allocate and initialize the fbdev info structure and the drm
1572 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1573 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1574 * values for the fbdev info structure.
1577 * Zero if everything went ok, nonzero otherwise.
1579 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1581 struct drm_device *dev = fb_helper->dev;
1584 drm_fb_helper_parse_command_line(fb_helper);
1586 mutex_lock(&dev->mode_config.mutex);
1587 count = drm_fb_helper_probe_connector_modes(fb_helper,
1588 dev->mode_config.max_width,
1589 dev->mode_config.max_height);
1590 mutex_unlock(&dev->mode_config.mutex);
1592 * we shouldn't end up with no modes here.
1595 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1597 drm_setup_crtcs(fb_helper);
1599 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1601 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1604 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1605 * probing all the outputs attached to the fb
1606 * @fb_helper: the drm_fb_helper
1608 * Scan the connectors attached to the fb_helper and try to put together a
1609 * setup after *notification of a change in output configuration.
1611 * Called at runtime, takes the mode config locks to be able to check/change the
1612 * modeset configuration. Must be run from process context (which usually means
1613 * either the output polling work or a work item launched from the driver's
1614 * hotplug interrupt).
1616 * Note that the driver must ensure that this is only called _after_ the fb has
1617 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1620 * 0 on success and a non-zero error code otherwise.
1622 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1624 struct drm_device *dev = fb_helper->dev;
1625 u32 max_width, max_height;
1630 mutex_lock(&fb_helper->dev->mode_config.mutex);
1631 if (!drm_fb_helper_is_bound(fb_helper)) {
1632 fb_helper->delayed_hotplug = true;
1633 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1636 DRM_DEBUG_KMS("\n");
1638 max_width = fb_helper->fb->width;
1639 max_height = fb_helper->fb->height;
1641 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1642 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1644 drm_modeset_lock_all(dev);
1645 drm_setup_crtcs(fb_helper);
1646 drm_modeset_unlock_all(dev);
1647 drm_fb_helper_set_par(fb_helper->fbdev);
1651 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1653 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1654 * but the module doesn't depend on any fb console symbols. At least
1655 * attempt to load fbcon to avoid leaving the system without a usable console.
1657 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1658 static int __init drm_fb_helper_modinit(void)
1660 const char *name = "fbcon";
1661 struct module *fbcon;
1663 mutex_lock(&module_mutex);
1664 fbcon = find_module(name);
1665 mutex_unlock(&module_mutex);
1668 request_module_nowait(name);
1672 module_init(drm_fb_helper_modinit);