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/console.h>
33 #include <linux/dma-buf.h>
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/sysrq.h>
38 #include <linux/vmalloc.h>
40 #include <drm/drm_atomic.h>
41 #include <drm/drm_crtc.h>
42 #include <drm/drm_crtc_helper.h>
43 #include <drm/drm_drv.h>
44 #include <drm/drm_fb_helper.h>
45 #include <drm/drm_fourcc.h>
46 #include <drm/drm_print.h>
47 #include <drm/drm_vblank.h>
49 #include "drm_crtc_helper_internal.h"
50 #include "drm_internal.h"
52 static bool drm_fbdev_emulation = true;
53 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
54 MODULE_PARM_DESC(fbdev_emulation,
55 "Enable legacy fbdev emulation [default=true]");
57 static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
58 module_param(drm_fbdev_overalloc, int, 0444);
59 MODULE_PARM_DESC(drm_fbdev_overalloc,
60 "Overallocation of the fbdev buffer (%) [default="
61 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
64 * In order to keep user-space compatibility, we want in certain use-cases
65 * to keep leaking the fbdev physical address to the user-space program
66 * handling the fbdev buffer.
67 * This is a bad habit essentially kept into closed source opengl driver
68 * that should really be moved into open-source upstream projects instead
69 * of using legacy physical addresses in user space to communicate with
70 * other out-of-tree kernel modules.
72 * This module_param *should* be removed as soon as possible and be
73 * considered as a broken and legacy behaviour from a modern fbdev device.
75 #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
76 static bool drm_leak_fbdev_smem = false;
77 module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
78 MODULE_PARM_DESC(drm_leak_fbdev_smem,
79 "Allow unsafe leaking fbdev physical smem address [default=false]");
82 static LIST_HEAD(kernel_fb_helper_list);
83 static DEFINE_MUTEX(kernel_fb_helper_lock);
88 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
89 * mode setting driver. They can be used mostly independently from the crtc
90 * helper functions used by many drivers to implement the kernel mode setting
93 * Drivers that support a dumb buffer with a virtual address and mmap support,
94 * should try out the generic fbdev emulation using drm_fbdev_generic_setup().
95 * It will automatically set up deferred I/O if the driver requires a shadow
98 * At runtime drivers should restore the fbdev console by using
99 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
100 * They should also notify the fb helper code from updates to the output
101 * configuration by using drm_fb_helper_output_poll_changed() as their
102 * &drm_mode_config_funcs.output_poll_changed callback.
104 * For suspend/resume consider using drm_mode_config_helper_suspend() and
105 * drm_mode_config_helper_resume() which takes care of fbdev as well.
107 * All other functions exported by the fb helper library can be used to
108 * implement the fbdev driver interface by the driver.
110 * It is possible, though perhaps somewhat tricky, to implement race-free
111 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
112 * helper must be called first to initialize the minimum required to make
113 * hotplug detection work. Drivers also need to make sure to properly set up
114 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
115 * it is safe to enable interrupts and start processing hotplug events. At the
116 * same time, drivers should initialize all modeset objects such as CRTCs,
117 * encoders and connectors. To finish up the fbdev helper initialization, the
118 * drm_fb_helper_init() function is called. To probe for all attached displays
119 * and set up an initial configuration using the detected hardware, drivers
120 * should call drm_fb_helper_initial_config().
122 * If &drm_framebuffer_funcs.dirty is set, the
123 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
124 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
125 * away. This worker then calls the dirty() function ensuring that it will
126 * always run in process context since the fb_*() function could be running in
127 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
128 * callback it will also schedule dirty_work with the damage collected from the
131 * Deferred I/O is not compatible with SHMEM. Such drivers should request an
132 * fbdev shadow buffer and call drm_fbdev_generic_setup() instead.
135 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
137 uint16_t *r_base, *g_base, *b_base;
139 if (crtc->funcs->gamma_set == NULL)
142 r_base = crtc->gamma_store;
143 g_base = r_base + crtc->gamma_size;
144 b_base = g_base + crtc->gamma_size;
146 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
147 crtc->gamma_size, NULL);
151 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
152 * @info: fbdev registered by the helper
154 int drm_fb_helper_debug_enter(struct fb_info *info)
156 struct drm_fb_helper *helper = info->par;
157 const struct drm_crtc_helper_funcs *funcs;
158 struct drm_mode_set *mode_set;
160 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
161 mutex_lock(&helper->client.modeset_mutex);
162 drm_client_for_each_modeset(mode_set, &helper->client) {
163 if (!mode_set->crtc->enabled)
166 funcs = mode_set->crtc->helper_private;
167 if (funcs->mode_set_base_atomic == NULL)
170 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
173 funcs->mode_set_base_atomic(mode_set->crtc,
177 ENTER_ATOMIC_MODE_SET);
179 mutex_unlock(&helper->client.modeset_mutex);
184 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
187 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
188 * @info: fbdev registered by the helper
190 int drm_fb_helper_debug_leave(struct fb_info *info)
192 struct drm_fb_helper *helper = info->par;
193 struct drm_client_dev *client = &helper->client;
194 struct drm_device *dev = helper->dev;
195 struct drm_crtc *crtc;
196 const struct drm_crtc_helper_funcs *funcs;
197 struct drm_mode_set *mode_set;
198 struct drm_framebuffer *fb;
200 mutex_lock(&client->modeset_mutex);
201 drm_client_for_each_modeset(mode_set, client) {
202 crtc = mode_set->crtc;
203 if (drm_drv_uses_atomic_modeset(crtc->dev))
206 funcs = crtc->helper_private;
207 fb = crtc->primary->fb;
213 drm_err(dev, "no fb to restore?\n");
217 if (funcs->mode_set_base_atomic == NULL)
220 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
221 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
222 crtc->y, LEAVE_ATOMIC_MODE_SET);
224 mutex_unlock(&client->modeset_mutex);
228 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
231 __drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
237 if (!drm_fbdev_emulation || !fb_helper)
240 if (READ_ONCE(fb_helper->deferred_setup))
243 mutex_lock(&fb_helper->lock);
246 * Yes this is the _locked version which expects the master lock
247 * to be held. But for forced restores we're intentionally
248 * racing here, see drm_fb_helper_set_par().
250 ret = drm_client_modeset_commit_locked(&fb_helper->client);
252 ret = drm_client_modeset_commit(&fb_helper->client);
255 do_delayed = fb_helper->delayed_hotplug;
257 fb_helper->delayed_hotplug = false;
258 mutex_unlock(&fb_helper->lock);
261 drm_fb_helper_hotplug_event(fb_helper);
267 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
268 * @fb_helper: driver-allocated fbdev helper, can be NULL
270 * This should be called from driver's drm &drm_driver.lastclose callback
271 * when implementing an fbcon on top of kms using this helper. This ensures that
272 * the user isn't greeted with a black screen when e.g. X dies.
275 * Zero if everything went ok, negative error code otherwise.
277 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
279 return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
281 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
283 #ifdef CONFIG_MAGIC_SYSRQ
285 * restore fbcon display for all kms driver's using this helper, used for sysrq
286 * and panic handling.
288 static bool drm_fb_helper_force_kernel_mode(void)
290 bool ret, error = false;
291 struct drm_fb_helper *helper;
293 if (list_empty(&kernel_fb_helper_list))
296 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
297 struct drm_device *dev = helper->dev;
299 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
302 mutex_lock(&helper->lock);
303 ret = drm_client_modeset_commit_locked(&helper->client);
306 mutex_unlock(&helper->lock);
311 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
315 ret = drm_fb_helper_force_kernel_mode();
317 DRM_ERROR("Failed to restore crtc configuration\n");
319 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
321 static void drm_fb_helper_sysrq(int dummy1)
323 schedule_work(&drm_fb_helper_restore_work);
326 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
327 .handler = drm_fb_helper_sysrq,
328 .help_msg = "force-fb(V)",
329 .action_msg = "Restore framebuffer console",
332 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
335 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
337 struct drm_fb_helper *fb_helper = info->par;
339 mutex_lock(&fb_helper->lock);
340 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
341 mutex_unlock(&fb_helper->lock);
345 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
346 * @blank: desired blanking state
347 * @info: fbdev registered by the helper
349 int drm_fb_helper_blank(int blank, struct fb_info *info)
351 if (oops_in_progress)
355 /* Display: On; HSync: On, VSync: On */
356 case FB_BLANK_UNBLANK:
357 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
359 /* Display: Off; HSync: On, VSync: On */
360 case FB_BLANK_NORMAL:
361 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
363 /* Display: Off; HSync: Off, VSync: On */
364 case FB_BLANK_HSYNC_SUSPEND:
365 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
367 /* Display: Off; HSync: On, VSync: Off */
368 case FB_BLANK_VSYNC_SUSPEND:
369 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
371 /* Display: Off; HSync: Off, VSync: Off */
372 case FB_BLANK_POWERDOWN:
373 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
378 EXPORT_SYMBOL(drm_fb_helper_blank);
380 static void drm_fb_helper_resume_worker(struct work_struct *work)
382 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
386 fb_set_suspend(helper->fbdev, 0);
390 static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
391 struct drm_clip_rect *clip)
393 struct drm_framebuffer *fb = fb_helper->fb;
394 unsigned int cpp = fb->format->cpp[0];
395 size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
396 void *src = fb_helper->fbdev->screen_buffer + offset;
397 void *dst = fb_helper->buffer->vaddr + offset;
398 size_t len = (clip->x2 - clip->x1) * cpp;
401 for (y = clip->y1; y < clip->y2; y++) {
402 memcpy(dst, src, len);
403 src += fb->pitches[0];
404 dst += fb->pitches[0];
408 static void drm_fb_helper_dirty_work(struct work_struct *work)
410 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
412 struct drm_clip_rect *clip = &helper->dirty_clip;
413 struct drm_clip_rect clip_copy;
417 spin_lock_irqsave(&helper->dirty_lock, flags);
419 clip->x1 = clip->y1 = ~0;
420 clip->x2 = clip->y2 = 0;
421 spin_unlock_irqrestore(&helper->dirty_lock, flags);
423 /* call dirty callback only when it has been really touched */
424 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
426 /* Generic fbdev uses a shadow buffer */
427 if (helper->buffer) {
428 vaddr = drm_client_buffer_vmap(helper->buffer);
431 drm_fb_helper_dirty_blit_real(helper, &clip_copy);
433 if (helper->fb->funcs->dirty)
434 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
438 drm_client_buffer_vunmap(helper->buffer);
443 * drm_fb_helper_prepare - setup a drm_fb_helper structure
445 * @helper: driver-allocated fbdev helper structure to set up
446 * @funcs: pointer to structure of functions associate with this helper
448 * Sets up the bare minimum to make the framebuffer helper usable. This is
449 * useful to implement race-free initialization of the polling helpers.
451 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
452 const struct drm_fb_helper_funcs *funcs)
454 INIT_LIST_HEAD(&helper->kernel_fb_list);
455 spin_lock_init(&helper->dirty_lock);
456 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
457 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
458 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
459 mutex_init(&helper->lock);
460 helper->funcs = funcs;
463 EXPORT_SYMBOL(drm_fb_helper_prepare);
466 * drm_fb_helper_init - initialize a &struct drm_fb_helper
468 * @fb_helper: driver-allocated fbdev helper structure to initialize
470 * This allocates the structures for the fbdev helper with the given limits.
471 * Note that this won't yet touch the hardware (through the driver interfaces)
472 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
473 * to allow driver writes more control over the exact init sequence.
475 * Drivers must call drm_fb_helper_prepare() before calling this function.
478 * Zero if everything went ok, nonzero otherwise.
480 int drm_fb_helper_init(struct drm_device *dev,
481 struct drm_fb_helper *fb_helper)
485 if (!drm_fbdev_emulation) {
486 dev->fb_helper = fb_helper;
491 * If this is not the generic fbdev client, initialize a drm_client
492 * without callbacks so we can use the modesets.
494 if (!fb_helper->client.funcs) {
495 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
500 dev->fb_helper = fb_helper;
504 EXPORT_SYMBOL(drm_fb_helper_init);
507 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
508 * @fb_helper: driver-allocated fbdev helper
510 * A helper to alloc fb_info and the members cmap and apertures. Called
511 * by the driver within the fb_probe fb_helper callback function. Drivers do not
512 * need to release the allocated fb_info structure themselves, this is
513 * automatically done when calling drm_fb_helper_fini().
516 * fb_info pointer if things went okay, pointer containing error code
519 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
521 struct device *dev = fb_helper->dev->dev;
522 struct fb_info *info;
525 info = framebuffer_alloc(0, dev);
527 return ERR_PTR(-ENOMEM);
529 ret = fb_alloc_cmap(&info->cmap, 256, 0);
534 * TODO: We really should be smarter here and alloc an apperture
535 * for each IORESOURCE_MEM resource helper->dev->dev has and also
536 * init the ranges of the appertures based on the resources.
537 * Note some drivers currently count on there being only 1 empty
538 * aperture and fill this themselves, these will need to be dealt
539 * with somehow when fixing this.
541 info->apertures = alloc_apertures(1);
542 if (!info->apertures) {
547 fb_helper->fbdev = info;
548 info->skip_vt_switch = true;
553 fb_dealloc_cmap(&info->cmap);
555 framebuffer_release(info);
558 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
561 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
562 * @fb_helper: driver-allocated fbdev helper, can be NULL
564 * A wrapper around unregister_framebuffer, to release the fb_info
565 * framebuffer device. This must be called before releasing all resources for
566 * @fb_helper by calling drm_fb_helper_fini().
568 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
570 if (fb_helper && fb_helper->fbdev)
571 unregister_framebuffer(fb_helper->fbdev);
573 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
576 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
577 * @fb_helper: driver-allocated fbdev helper, can be NULL
579 * This cleans up all remaining resources associated with @fb_helper.
581 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
583 struct fb_info *info;
588 fb_helper->dev->fb_helper = NULL;
590 if (!drm_fbdev_emulation)
593 cancel_work_sync(&fb_helper->resume_work);
594 cancel_work_sync(&fb_helper->dirty_work);
596 info = fb_helper->fbdev;
599 fb_dealloc_cmap(&info->cmap);
600 framebuffer_release(info);
602 fb_helper->fbdev = NULL;
604 mutex_lock(&kernel_fb_helper_lock);
605 if (!list_empty(&fb_helper->kernel_fb_list)) {
606 list_del(&fb_helper->kernel_fb_list);
607 if (list_empty(&kernel_fb_helper_list))
608 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
610 mutex_unlock(&kernel_fb_helper_lock);
612 mutex_destroy(&fb_helper->lock);
614 if (!fb_helper->client.funcs)
615 drm_client_release(&fb_helper->client);
617 EXPORT_SYMBOL(drm_fb_helper_fini);
619 static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper)
621 struct drm_device *dev = fb_helper->dev;
622 struct drm_framebuffer *fb = fb_helper->fb;
624 return dev->mode_config.prefer_shadow_fbdev ||
625 dev->mode_config.prefer_shadow ||
629 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
630 u32 width, u32 height)
632 struct drm_fb_helper *helper = info->par;
633 struct drm_clip_rect *clip = &helper->dirty_clip;
636 if (!drm_fbdev_use_shadow_fb(helper))
639 spin_lock_irqsave(&helper->dirty_lock, flags);
640 clip->x1 = min_t(u32, clip->x1, x);
641 clip->y1 = min_t(u32, clip->y1, y);
642 clip->x2 = max_t(u32, clip->x2, x + width);
643 clip->y2 = max_t(u32, clip->y2, y + height);
644 spin_unlock_irqrestore(&helper->dirty_lock, flags);
646 schedule_work(&helper->dirty_work);
650 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
651 * @info: fb_info struct pointer
652 * @pagelist: list of dirty mmap framebuffer pages
654 * This function is used as the &fb_deferred_io.deferred_io
655 * callback function for flushing the fbdev mmap writes.
657 void drm_fb_helper_deferred_io(struct fb_info *info,
658 struct list_head *pagelist)
660 unsigned long start, end, min, max;
666 list_for_each_entry(page, pagelist, lru) {
667 start = page->index << PAGE_SHIFT;
668 end = start + PAGE_SIZE - 1;
669 min = min(min, start);
674 y1 = min / info->fix.line_length;
675 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
677 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
680 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
683 * drm_fb_helper_sys_read - wrapper around fb_sys_read
684 * @info: fb_info struct pointer
685 * @buf: userspace buffer to read from framebuffer memory
686 * @count: number of bytes to read from framebuffer memory
687 * @ppos: read offset within framebuffer memory
689 * A wrapper around fb_sys_read implemented by fbdev core
691 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
692 size_t count, loff_t *ppos)
694 return fb_sys_read(info, buf, count, ppos);
696 EXPORT_SYMBOL(drm_fb_helper_sys_read);
699 * drm_fb_helper_sys_write - wrapper around fb_sys_write
700 * @info: fb_info struct pointer
701 * @buf: userspace buffer to write to framebuffer memory
702 * @count: number of bytes to write to framebuffer memory
703 * @ppos: write offset within framebuffer memory
705 * A wrapper around fb_sys_write implemented by fbdev core
707 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
708 size_t count, loff_t *ppos)
712 ret = fb_sys_write(info, buf, count, ppos);
714 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
719 EXPORT_SYMBOL(drm_fb_helper_sys_write);
722 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
723 * @info: fbdev registered by the helper
724 * @rect: info about rectangle to fill
726 * A wrapper around sys_fillrect implemented by fbdev core
728 void drm_fb_helper_sys_fillrect(struct fb_info *info,
729 const struct fb_fillrect *rect)
731 sys_fillrect(info, rect);
732 drm_fb_helper_dirty(info, rect->dx, rect->dy,
733 rect->width, rect->height);
735 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
738 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
739 * @info: fbdev registered by the helper
740 * @area: info about area to copy
742 * A wrapper around sys_copyarea implemented by fbdev core
744 void drm_fb_helper_sys_copyarea(struct fb_info *info,
745 const struct fb_copyarea *area)
747 sys_copyarea(info, area);
748 drm_fb_helper_dirty(info, area->dx, area->dy,
749 area->width, area->height);
751 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
754 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
755 * @info: fbdev registered by the helper
756 * @image: info about image to blit
758 * A wrapper around sys_imageblit implemented by fbdev core
760 void drm_fb_helper_sys_imageblit(struct fb_info *info,
761 const struct fb_image *image)
763 sys_imageblit(info, image);
764 drm_fb_helper_dirty(info, image->dx, image->dy,
765 image->width, image->height);
767 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
770 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
771 * @info: fbdev registered by the helper
772 * @rect: info about rectangle to fill
774 * A wrapper around cfb_fillrect implemented by fbdev core
776 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
777 const struct fb_fillrect *rect)
779 cfb_fillrect(info, rect);
780 drm_fb_helper_dirty(info, rect->dx, rect->dy,
781 rect->width, rect->height);
783 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
786 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
787 * @info: fbdev registered by the helper
788 * @area: info about area to copy
790 * A wrapper around cfb_copyarea implemented by fbdev core
792 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
793 const struct fb_copyarea *area)
795 cfb_copyarea(info, area);
796 drm_fb_helper_dirty(info, area->dx, area->dy,
797 area->width, area->height);
799 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
802 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
803 * @info: fbdev registered by the helper
804 * @image: info about image to blit
806 * A wrapper around cfb_imageblit implemented by fbdev core
808 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
809 const struct fb_image *image)
811 cfb_imageblit(info, image);
812 drm_fb_helper_dirty(info, image->dx, image->dy,
813 image->width, image->height);
815 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
818 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
819 * @fb_helper: driver-allocated fbdev helper, can be NULL
820 * @suspend: whether to suspend or resume
822 * A wrapper around fb_set_suspend implemented by fbdev core.
823 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
826 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
828 if (fb_helper && fb_helper->fbdev)
829 fb_set_suspend(fb_helper->fbdev, suspend);
831 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
834 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
835 * takes the console lock
836 * @fb_helper: driver-allocated fbdev helper, can be NULL
837 * @suspend: whether to suspend or resume
839 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
840 * isn't available on resume, a worker is tasked with waiting for the lock
841 * to become available. The console lock can be pretty contented on resume
842 * due to all the printk activity.
844 * This function can be called multiple times with the same state since
845 * &fb_info.state is checked to see if fbdev is running or not before locking.
847 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
849 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
852 if (!fb_helper || !fb_helper->fbdev)
855 /* make sure there's no pending/ongoing resume */
856 flush_work(&fb_helper->resume_work);
859 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
865 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
868 if (!console_trylock()) {
869 schedule_work(&fb_helper->resume_work);
874 fb_set_suspend(fb_helper->fbdev, suspend);
877 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
879 static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
881 u32 *palette = (u32 *)info->pseudo_palette;
884 if (cmap->start + cmap->len > 16)
887 for (i = 0; i < cmap->len; ++i) {
888 u16 red = cmap->red[i];
889 u16 green = cmap->green[i];
890 u16 blue = cmap->blue[i];
893 red >>= 16 - info->var.red.length;
894 green >>= 16 - info->var.green.length;
895 blue >>= 16 - info->var.blue.length;
896 value = (red << info->var.red.offset) |
897 (green << info->var.green.offset) |
898 (blue << info->var.blue.offset);
899 if (info->var.transp.length > 0) {
900 u32 mask = (1 << info->var.transp.length) - 1;
902 mask <<= info->var.transp.offset;
905 palette[cmap->start + i] = value;
911 static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
913 struct drm_fb_helper *fb_helper = info->par;
914 struct drm_mode_set *modeset;
915 struct drm_crtc *crtc;
919 drm_modeset_lock_all(fb_helper->dev);
920 drm_client_for_each_modeset(modeset, &fb_helper->client) {
921 crtc = modeset->crtc;
922 if (!crtc->funcs->gamma_set || !crtc->gamma_size)
925 if (cmap->start + cmap->len > crtc->gamma_size)
928 r = crtc->gamma_store;
929 g = r + crtc->gamma_size;
930 b = g + crtc->gamma_size;
932 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
933 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
934 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
936 ret = crtc->funcs->gamma_set(crtc, r, g, b,
937 crtc->gamma_size, NULL);
941 drm_modeset_unlock_all(fb_helper->dev);
946 static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
947 struct fb_cmap *cmap)
949 struct drm_device *dev = crtc->dev;
950 struct drm_property_blob *gamma_lut;
951 struct drm_color_lut *lut;
952 int size = crtc->gamma_size;
955 if (!size || cmap->start + cmap->len > size)
956 return ERR_PTR(-EINVAL);
958 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
959 if (IS_ERR(gamma_lut))
962 lut = gamma_lut->data;
963 if (cmap->start || cmap->len != size) {
964 u16 *r = crtc->gamma_store;
965 u16 *g = r + crtc->gamma_size;
966 u16 *b = g + crtc->gamma_size;
968 for (i = 0; i < cmap->start; i++) {
973 for (i = cmap->start + cmap->len; i < size; i++) {
980 for (i = 0; i < cmap->len; i++) {
981 lut[cmap->start + i].red = cmap->red[i];
982 lut[cmap->start + i].green = cmap->green[i];
983 lut[cmap->start + i].blue = cmap->blue[i];
989 static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
991 struct drm_fb_helper *fb_helper = info->par;
992 struct drm_device *dev = fb_helper->dev;
993 struct drm_property_blob *gamma_lut = NULL;
994 struct drm_modeset_acquire_ctx ctx;
995 struct drm_crtc_state *crtc_state;
996 struct drm_atomic_state *state;
997 struct drm_mode_set *modeset;
998 struct drm_crtc *crtc;
1003 drm_modeset_acquire_init(&ctx, 0);
1005 state = drm_atomic_state_alloc(dev);
1011 state->acquire_ctx = &ctx;
1013 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1014 crtc = modeset->crtc;
1017 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
1018 if (IS_ERR(gamma_lut)) {
1019 ret = PTR_ERR(gamma_lut);
1024 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1025 if (IS_ERR(crtc_state)) {
1026 ret = PTR_ERR(crtc_state);
1030 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
1032 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
1033 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
1035 crtc_state->color_mgmt_changed |= replaced;
1038 ret = drm_atomic_commit(state);
1042 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1043 crtc = modeset->crtc;
1045 r = crtc->gamma_store;
1046 g = r + crtc->gamma_size;
1047 b = g + crtc->gamma_size;
1049 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1050 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1051 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1055 if (ret == -EDEADLK)
1058 drm_property_blob_put(gamma_lut);
1059 drm_atomic_state_put(state);
1061 drm_modeset_drop_locks(&ctx);
1062 drm_modeset_acquire_fini(&ctx);
1067 drm_atomic_state_clear(state);
1068 drm_modeset_backoff(&ctx);
1073 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1074 * @cmap: cmap to set
1075 * @info: fbdev registered by the helper
1077 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1079 struct drm_fb_helper *fb_helper = info->par;
1080 struct drm_device *dev = fb_helper->dev;
1083 if (oops_in_progress)
1086 mutex_lock(&fb_helper->lock);
1088 if (!drm_master_internal_acquire(dev)) {
1093 mutex_lock(&fb_helper->client.modeset_mutex);
1094 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1095 ret = setcmap_pseudo_palette(cmap, info);
1096 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1097 ret = setcmap_atomic(cmap, info);
1099 ret = setcmap_legacy(cmap, info);
1100 mutex_unlock(&fb_helper->client.modeset_mutex);
1102 drm_master_internal_release(dev);
1104 mutex_unlock(&fb_helper->lock);
1108 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1111 * drm_fb_helper_ioctl - legacy ioctl implementation
1112 * @info: fbdev registered by the helper
1113 * @cmd: ioctl command
1114 * @arg: ioctl argument
1116 * A helper to implement the standard fbdev ioctl. Only
1117 * FBIO_WAITFORVSYNC is implemented for now.
1119 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1122 struct drm_fb_helper *fb_helper = info->par;
1123 struct drm_device *dev = fb_helper->dev;
1124 struct drm_crtc *crtc;
1127 mutex_lock(&fb_helper->lock);
1128 if (!drm_master_internal_acquire(dev)) {
1134 case FBIO_WAITFORVSYNC:
1136 * Only consider the first CRTC.
1138 * This ioctl is supposed to take the CRTC number as
1139 * an argument, but in fbdev times, what that number
1140 * was supposed to be was quite unclear, different
1141 * drivers were passing that argument differently
1142 * (some by reference, some by value), and most of the
1143 * userspace applications were just hardcoding 0 as an
1146 * The first CRTC should be the integrated panel on
1147 * most drivers, so this is the best choice we can
1148 * make. If we're not smart enough here, one should
1149 * just consider switch the userspace to KMS.
1151 crtc = fb_helper->client.modesets[0].crtc;
1154 * Only wait for a vblank event if the CRTC is
1155 * enabled, otherwise just don't do anythintg,
1156 * not even report an error.
1158 ret = drm_crtc_vblank_get(crtc);
1160 drm_crtc_wait_one_vblank(crtc);
1161 drm_crtc_vblank_put(crtc);
1170 drm_master_internal_release(dev);
1172 mutex_unlock(&fb_helper->lock);
1175 EXPORT_SYMBOL(drm_fb_helper_ioctl);
1177 static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1178 const struct fb_var_screeninfo *var_2)
1180 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1181 var_1->grayscale == var_2->grayscale &&
1182 var_1->red.offset == var_2->red.offset &&
1183 var_1->red.length == var_2->red.length &&
1184 var_1->red.msb_right == var_2->red.msb_right &&
1185 var_1->green.offset == var_2->green.offset &&
1186 var_1->green.length == var_2->green.length &&
1187 var_1->green.msb_right == var_2->green.msb_right &&
1188 var_1->blue.offset == var_2->blue.offset &&
1189 var_1->blue.length == var_2->blue.length &&
1190 var_1->blue.msb_right == var_2->blue.msb_right &&
1191 var_1->transp.offset == var_2->transp.offset &&
1192 var_1->transp.length == var_2->transp.length &&
1193 var_1->transp.msb_right == var_2->transp.msb_right;
1196 static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1201 var->red.offset = 0;
1202 var->green.offset = 0;
1203 var->blue.offset = 0;
1204 var->red.length = 8; /* 8bit DAC */
1205 var->green.length = 8;
1206 var->blue.length = 8;
1207 var->transp.offset = 0;
1208 var->transp.length = 0;
1211 var->red.offset = 10;
1212 var->green.offset = 5;
1213 var->blue.offset = 0;
1214 var->red.length = 5;
1215 var->green.length = 5;
1216 var->blue.length = 5;
1217 var->transp.offset = 15;
1218 var->transp.length = 1;
1221 var->red.offset = 11;
1222 var->green.offset = 5;
1223 var->blue.offset = 0;
1224 var->red.length = 5;
1225 var->green.length = 6;
1226 var->blue.length = 5;
1227 var->transp.offset = 0;
1230 var->red.offset = 16;
1231 var->green.offset = 8;
1232 var->blue.offset = 0;
1233 var->red.length = 8;
1234 var->green.length = 8;
1235 var->blue.length = 8;
1236 var->transp.offset = 0;
1237 var->transp.length = 0;
1240 var->red.offset = 16;
1241 var->green.offset = 8;
1242 var->blue.offset = 0;
1243 var->red.length = 8;
1244 var->green.length = 8;
1245 var->blue.length = 8;
1246 var->transp.offset = 24;
1247 var->transp.length = 8;
1255 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1256 * @var: screeninfo to check
1257 * @info: fbdev registered by the helper
1259 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1260 struct fb_info *info)
1262 struct drm_fb_helper *fb_helper = info->par;
1263 struct drm_framebuffer *fb = fb_helper->fb;
1264 struct drm_device *dev = fb_helper->dev;
1266 if (in_dbg_master())
1269 if (var->pixclock != 0) {
1270 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1274 if ((drm_format_info_block_width(fb->format, 0) > 1) ||
1275 (drm_format_info_block_height(fb->format, 0) > 1))
1279 * Changes struct fb_var_screeninfo are currently not pushed back
1280 * to KMS, hence fail if different settings are requested.
1282 if (var->bits_per_pixel > fb->format->cpp[0] * 8 ||
1283 var->xres > fb->width || var->yres > fb->height ||
1284 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1285 drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
1286 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1287 var->xres, var->yres, var->bits_per_pixel,
1288 var->xres_virtual, var->yres_virtual,
1289 fb->width, fb->height, fb->format->cpp[0] * 8);
1294 * Workaround for SDL 1.2, which is known to be setting all pixel format
1295 * fields values to zero in some cases. We treat this situation as a
1296 * kind of "use some reasonable autodetected values".
1298 if (!var->red.offset && !var->green.offset &&
1299 !var->blue.offset && !var->transp.offset &&
1300 !var->red.length && !var->green.length &&
1301 !var->blue.length && !var->transp.length &&
1302 !var->red.msb_right && !var->green.msb_right &&
1303 !var->blue.msb_right && !var->transp.msb_right) {
1304 drm_fb_helper_fill_pixel_fmt(var, fb->format->depth);
1308 * Likewise, bits_per_pixel should be rounded up to a supported value.
1310 var->bits_per_pixel = fb->format->cpp[0] * 8;
1313 * drm fbdev emulation doesn't support changing the pixel format at all,
1314 * so reject all pixel format changing requests.
1316 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1317 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n");
1323 EXPORT_SYMBOL(drm_fb_helper_check_var);
1326 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1327 * @info: fbdev registered by the helper
1329 * This will let fbcon do the mode init and is called at initialization time by
1330 * the fbdev core when registering the driver, and later on through the hotplug
1333 int drm_fb_helper_set_par(struct fb_info *info)
1335 struct drm_fb_helper *fb_helper = info->par;
1336 struct fb_var_screeninfo *var = &info->var;
1339 if (oops_in_progress)
1342 if (var->pixclock != 0) {
1343 drm_err(fb_helper->dev, "PIXEL CLOCK SET\n");
1348 * Normally we want to make sure that a kms master takes precedence over
1349 * fbdev, to avoid fbdev flickering and occasionally stealing the
1350 * display status. But Xorg first sets the vt back to text mode using
1351 * the KDSET IOCTL with KD_TEXT, and only after that drops the master
1352 * status when exiting.
1354 * In the past this was caught by drm_fb_helper_lastclose(), but on
1355 * modern systems where logind always keeps a drm fd open to orchestrate
1356 * the vt switching, this doesn't work.
1358 * To not break the userspace ABI we have this special case here, which
1359 * is only used for the above case. Everything else uses the normal
1360 * commit function, which ensures that we never steal the display from
1361 * an active drm master.
1363 force = var->activate & FB_ACTIVATE_KD_TEXT;
1365 __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force);
1369 EXPORT_SYMBOL(drm_fb_helper_set_par);
1371 static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
1373 struct drm_mode_set *mode_set;
1375 mutex_lock(&fb_helper->client.modeset_mutex);
1376 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1380 mutex_unlock(&fb_helper->client.modeset_mutex);
1383 static int pan_display_atomic(struct fb_var_screeninfo *var,
1384 struct fb_info *info)
1386 struct drm_fb_helper *fb_helper = info->par;
1389 pan_set(fb_helper, var->xoffset, var->yoffset);
1391 ret = drm_client_modeset_commit_locked(&fb_helper->client);
1393 info->var.xoffset = var->xoffset;
1394 info->var.yoffset = var->yoffset;
1396 pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
1401 static int pan_display_legacy(struct fb_var_screeninfo *var,
1402 struct fb_info *info)
1404 struct drm_fb_helper *fb_helper = info->par;
1405 struct drm_client_dev *client = &fb_helper->client;
1406 struct drm_mode_set *modeset;
1409 mutex_lock(&client->modeset_mutex);
1410 drm_modeset_lock_all(fb_helper->dev);
1411 drm_client_for_each_modeset(modeset, client) {
1412 modeset->x = var->xoffset;
1413 modeset->y = var->yoffset;
1415 if (modeset->num_connectors) {
1416 ret = drm_mode_set_config_internal(modeset);
1418 info->var.xoffset = var->xoffset;
1419 info->var.yoffset = var->yoffset;
1423 drm_modeset_unlock_all(fb_helper->dev);
1424 mutex_unlock(&client->modeset_mutex);
1430 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1431 * @var: updated screen information
1432 * @info: fbdev registered by the helper
1434 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1435 struct fb_info *info)
1437 struct drm_fb_helper *fb_helper = info->par;
1438 struct drm_device *dev = fb_helper->dev;
1441 if (oops_in_progress)
1444 mutex_lock(&fb_helper->lock);
1445 if (!drm_master_internal_acquire(dev)) {
1450 if (drm_drv_uses_atomic_modeset(dev))
1451 ret = pan_display_atomic(var, info);
1453 ret = pan_display_legacy(var, info);
1455 drm_master_internal_release(dev);
1457 mutex_unlock(&fb_helper->lock);
1461 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1464 * Allocates the backing storage and sets up the fbdev info structure through
1465 * the ->fb_probe callback.
1467 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1470 struct drm_client_dev *client = &fb_helper->client;
1471 struct drm_device *dev = fb_helper->dev;
1474 struct drm_connector_list_iter conn_iter;
1475 struct drm_fb_helper_surface_size sizes;
1476 struct drm_connector *connector;
1477 struct drm_mode_set *mode_set;
1480 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1481 sizes.surface_depth = 24;
1482 sizes.surface_bpp = 32;
1483 sizes.fb_width = (u32)-1;
1484 sizes.fb_height = (u32)-1;
1487 * If driver picks 8 or 16 by default use that for both depth/bpp
1490 if (preferred_bpp != sizes.surface_bpp)
1491 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1493 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1494 drm_client_for_each_connector_iter(connector, &conn_iter) {
1495 struct drm_cmdline_mode *cmdline_mode;
1497 cmdline_mode = &connector->cmdline_mode;
1499 if (cmdline_mode->bpp_specified) {
1500 switch (cmdline_mode->bpp) {
1502 sizes.surface_depth = sizes.surface_bpp = 8;
1505 sizes.surface_depth = 15;
1506 sizes.surface_bpp = 16;
1509 sizes.surface_depth = sizes.surface_bpp = 16;
1512 sizes.surface_depth = sizes.surface_bpp = 24;
1515 sizes.surface_depth = 24;
1516 sizes.surface_bpp = 32;
1522 drm_connector_list_iter_end(&conn_iter);
1525 * If we run into a situation where, for example, the primary plane
1526 * supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
1527 * 16) we need to scale down the depth of the sizes we request.
1529 mutex_lock(&client->modeset_mutex);
1530 drm_client_for_each_modeset(mode_set, client) {
1531 struct drm_crtc *crtc = mode_set->crtc;
1532 struct drm_plane *plane = crtc->primary;
1535 drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
1537 for (j = 0; j < plane->format_count; j++) {
1538 const struct drm_format_info *fmt;
1540 fmt = drm_format_info(plane->format_types[j]);
1543 * Do not consider YUV or other complicated formats
1544 * for framebuffers. This means only legacy formats
1545 * are supported (fmt->depth is a legacy field) but
1546 * the framebuffer emulation can only deal with such
1547 * formats, specifically RGB/BGA formats.
1549 if (fmt->depth == 0)
1552 /* We found a perfect fit, great */
1553 if (fmt->depth == sizes.surface_depth) {
1554 best_depth = fmt->depth;
1558 /* Skip depths above what we're looking for */
1559 if (fmt->depth > sizes.surface_depth)
1562 /* Best depth found so far */
1563 if (fmt->depth > best_depth)
1564 best_depth = fmt->depth;
1567 if (sizes.surface_depth != best_depth && best_depth) {
1568 drm_info(dev, "requested bpp %d, scaled depth down to %d",
1569 sizes.surface_bpp, best_depth);
1570 sizes.surface_depth = best_depth;
1573 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1575 drm_client_for_each_modeset(mode_set, client) {
1576 struct drm_display_mode *desired_mode;
1578 /* in case of tile group, are we the last tile vert or horiz?
1579 * If no tile group you are always the last one both vertically
1582 bool lastv = true, lasth = true;
1584 desired_mode = mode_set->mode;
1594 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1595 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1597 for (j = 0; j < mode_set->num_connectors; j++) {
1598 struct drm_connector *connector = mode_set->connectors[j];
1600 if (connector->has_tile &&
1601 desired_mode->hdisplay == connector->tile_h_size &&
1602 desired_mode->vdisplay == connector->tile_v_size) {
1603 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1604 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1605 /* cloning to multiple tiles is just crazy-talk, so: */
1611 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1613 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1615 mutex_unlock(&client->modeset_mutex);
1617 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1618 drm_info(dev, "Cannot find any crtc or sizes\n");
1620 /* First time: disable all crtc's.. */
1621 if (!fb_helper->deferred_setup)
1622 drm_client_modeset_commit(client);
1626 /* Handle our overallocation */
1627 sizes.surface_height *= drm_fbdev_overalloc;
1628 sizes.surface_height /= 100;
1630 /* push down into drivers */
1631 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1635 strcpy(fb_helper->fb->comm, "[fbcon]");
1639 static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1642 info->fix.type = FB_TYPE_PACKED_PIXELS;
1643 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1644 FB_VISUAL_TRUECOLOR;
1645 info->fix.mmio_start = 0;
1646 info->fix.mmio_len = 0;
1647 info->fix.type_aux = 0;
1648 info->fix.xpanstep = 1; /* doing it in hw */
1649 info->fix.ypanstep = 1; /* doing it in hw */
1650 info->fix.ywrapstep = 0;
1651 info->fix.accel = FB_ACCEL_NONE;
1653 info->fix.line_length = pitch;
1656 static void drm_fb_helper_fill_var(struct fb_info *info,
1657 struct drm_fb_helper *fb_helper,
1658 uint32_t fb_width, uint32_t fb_height)
1660 struct drm_framebuffer *fb = fb_helper->fb;
1662 WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) ||
1663 (drm_format_info_block_height(fb->format, 0) > 1));
1664 info->pseudo_palette = fb_helper->pseudo_palette;
1665 info->var.xres_virtual = fb->width;
1666 info->var.yres_virtual = fb->height;
1667 info->var.bits_per_pixel = fb->format->cpp[0] * 8;
1668 info->var.accel_flags = FB_ACCELF_TEXT;
1669 info->var.xoffset = 0;
1670 info->var.yoffset = 0;
1671 info->var.activate = FB_ACTIVATE_NOW;
1673 drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
1675 info->var.xres = fb_width;
1676 info->var.yres = fb_height;
1680 * drm_fb_helper_fill_info - initializes fbdev information
1681 * @info: fbdev instance to set up
1682 * @fb_helper: fb helper instance to use as template
1683 * @sizes: describes fbdev size and scanout surface size
1685 * Sets up the variable and fixed fbdev metainformation from the given fb helper
1686 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
1688 * Drivers should call this (or their equivalent setup code) from their
1689 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1690 * backing storage framebuffer.
1692 void drm_fb_helper_fill_info(struct fb_info *info,
1693 struct drm_fb_helper *fb_helper,
1694 struct drm_fb_helper_surface_size *sizes)
1696 struct drm_framebuffer *fb = fb_helper->fb;
1698 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
1699 drm_fb_helper_fill_var(info, fb_helper,
1700 sizes->fb_width, sizes->fb_height);
1702 info->par = fb_helper;
1703 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
1704 fb_helper->dev->driver->name);
1707 EXPORT_SYMBOL(drm_fb_helper_fill_info);
1710 * This is a continuation of drm_setup_crtcs() that sets up anything related
1711 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
1712 * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
1713 * So, any setup that touches those fields needs to be done here instead of in
1714 * drm_setup_crtcs().
1716 static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
1718 struct drm_client_dev *client = &fb_helper->client;
1719 struct drm_connector_list_iter conn_iter;
1720 struct fb_info *info = fb_helper->fbdev;
1721 unsigned int rotation, sw_rotations = 0;
1722 struct drm_connector *connector;
1723 struct drm_mode_set *modeset;
1725 mutex_lock(&client->modeset_mutex);
1726 drm_client_for_each_modeset(modeset, client) {
1727 if (!modeset->num_connectors)
1730 modeset->fb = fb_helper->fb;
1732 if (drm_client_rotation(modeset, &rotation))
1733 /* Rotating in hardware, fbcon should not rotate */
1734 sw_rotations |= DRM_MODE_ROTATE_0;
1736 sw_rotations |= rotation;
1738 mutex_unlock(&client->modeset_mutex);
1740 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1741 drm_client_for_each_connector_iter(connector, &conn_iter) {
1743 /* use first connected connector for the physical dimensions */
1744 if (connector->status == connector_status_connected) {
1745 info->var.width = connector->display_info.width_mm;
1746 info->var.height = connector->display_info.height_mm;
1750 drm_connector_list_iter_end(&conn_iter);
1752 switch (sw_rotations) {
1753 case DRM_MODE_ROTATE_0:
1754 info->fbcon_rotate_hint = FB_ROTATE_UR;
1756 case DRM_MODE_ROTATE_90:
1757 info->fbcon_rotate_hint = FB_ROTATE_CCW;
1759 case DRM_MODE_ROTATE_180:
1760 info->fbcon_rotate_hint = FB_ROTATE_UD;
1762 case DRM_MODE_ROTATE_270:
1763 info->fbcon_rotate_hint = FB_ROTATE_CW;
1767 * Multiple bits are set / multiple rotations requested
1768 * fbcon cannot handle separate rotation settings per
1769 * output, so fallback to unrotated.
1771 info->fbcon_rotate_hint = FB_ROTATE_UR;
1775 /* Note: Drops fb_helper->lock before returning. */
1777 __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
1780 struct drm_device *dev = fb_helper->dev;
1781 struct fb_info *info;
1782 unsigned int width, height;
1785 width = dev->mode_config.max_width;
1786 height = dev->mode_config.max_height;
1788 drm_client_modeset_probe(&fb_helper->client, width, height);
1789 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1791 if (ret == -EAGAIN) {
1792 fb_helper->preferred_bpp = bpp_sel;
1793 fb_helper->deferred_setup = true;
1796 mutex_unlock(&fb_helper->lock);
1800 drm_setup_crtcs_fb(fb_helper);
1802 fb_helper->deferred_setup = false;
1804 info = fb_helper->fbdev;
1805 info->var.pixclock = 0;
1806 /* Shamelessly allow physical address leaking to userspace */
1807 #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
1808 if (!drm_leak_fbdev_smem)
1810 /* don't leak any physical addresses to userspace */
1811 info->flags |= FBINFO_HIDE_SMEM_START;
1813 /* Need to drop locks to avoid recursive deadlock in
1814 * register_framebuffer. This is ok because the only thing left to do is
1815 * register the fbdev emulation instance in kernel_fb_helper_list. */
1816 mutex_unlock(&fb_helper->lock);
1818 ret = register_framebuffer(info);
1822 dev_info(dev->dev, "fb%d: %s frame buffer device\n",
1823 info->node, info->fix.id);
1825 mutex_lock(&kernel_fb_helper_lock);
1826 if (list_empty(&kernel_fb_helper_list))
1827 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1829 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1830 mutex_unlock(&kernel_fb_helper_lock);
1836 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1837 * @fb_helper: fb_helper device struct
1838 * @bpp_sel: bpp value to use for the framebuffer configuration
1840 * Scans the CRTCs and connectors and tries to put together an initial setup.
1841 * At the moment, this is a cloned configuration across all heads with
1842 * a new framebuffer object as the backing store.
1844 * Note that this also registers the fbdev and so allows userspace to call into
1845 * the driver through the fbdev interfaces.
1847 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
1848 * to let the driver allocate and initialize the fbdev info structure and the
1849 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
1850 * as a helper to setup simple default values for the fbdev info structure.
1854 * When you have fbcon support built-in or already loaded, this function will do
1855 * a full modeset to setup the fbdev console. Due to locking misdesign in the
1856 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
1857 * console_lock. Until console_unlock is called no dmesg lines will be sent out
1858 * to consoles, not even serial console. This means when your driver crashes,
1859 * you will see absolutely nothing else but a system stuck in this function,
1860 * with no further output. Any kind of printk() you place within your own driver
1861 * or in the drm core modeset code will also never show up.
1863 * Standard debug practice is to run the fbcon setup without taking the
1864 * console_lock as a hack, to be able to see backtraces and crashes on the
1865 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
1868 * The other option is to just disable fbdev emulation since very likely the
1869 * first modeset from userspace will crash in the same way, and is even easier
1870 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
1871 * kernel cmdline option.
1874 * Zero if everything went ok, nonzero otherwise.
1876 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1880 if (!drm_fbdev_emulation)
1883 mutex_lock(&fb_helper->lock);
1884 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
1888 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1891 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1892 * probing all the outputs attached to the fb
1893 * @fb_helper: driver-allocated fbdev helper, can be NULL
1895 * Scan the connectors attached to the fb_helper and try to put together a
1896 * setup after notification of a change in output configuration.
1898 * Called at runtime, takes the mode config locks to be able to check/change the
1899 * modeset configuration. Must be run from process context (which usually means
1900 * either the output polling work or a work item launched from the driver's
1901 * hotplug interrupt).
1903 * Note that drivers may call this even before calling
1904 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
1905 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1906 * not miss any hotplug events.
1909 * 0 on success and a non-zero error code otherwise.
1911 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1915 if (!drm_fbdev_emulation || !fb_helper)
1918 mutex_lock(&fb_helper->lock);
1919 if (fb_helper->deferred_setup) {
1920 err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
1921 fb_helper->preferred_bpp);
1925 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
1926 fb_helper->delayed_hotplug = true;
1927 mutex_unlock(&fb_helper->lock);
1931 drm_master_internal_release(fb_helper->dev);
1933 drm_dbg_kms(fb_helper->dev, "\n");
1935 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
1936 drm_setup_crtcs_fb(fb_helper);
1937 mutex_unlock(&fb_helper->lock);
1939 drm_fb_helper_set_par(fb_helper->fbdev);
1943 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1946 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
1949 * This function can be used as the &drm_driver->lastclose callback for drivers
1950 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
1952 void drm_fb_helper_lastclose(struct drm_device *dev)
1954 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
1956 EXPORT_SYMBOL(drm_fb_helper_lastclose);
1959 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
1960 * helper for fbdev emulation
1963 * This function can be used as the
1964 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only
1965 * need to call drm_fb_helper_hotplug_event().
1967 void drm_fb_helper_output_poll_changed(struct drm_device *dev)
1969 drm_fb_helper_hotplug_event(dev->fb_helper);
1971 EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);
1973 /* @user: 1=userspace, 0=fbcon */
1974 static int drm_fbdev_fb_open(struct fb_info *info, int user)
1976 struct drm_fb_helper *fb_helper = info->par;
1978 /* No need to take a ref for fbcon because it unbinds on unregister */
1979 if (user && !try_module_get(fb_helper->dev->driver->fops->owner))
1985 static int drm_fbdev_fb_release(struct fb_info *info, int user)
1987 struct drm_fb_helper *fb_helper = info->par;
1990 module_put(fb_helper->dev->driver->fops->owner);
1995 static void drm_fbdev_cleanup(struct drm_fb_helper *fb_helper)
1997 struct fb_info *fbi = fb_helper->fbdev;
1998 void *shadow = NULL;
2000 if (!fb_helper->dev)
2003 if (fbi && fbi->fbdefio) {
2004 fb_deferred_io_cleanup(fbi);
2005 shadow = fbi->screen_buffer;
2008 drm_fb_helper_fini(fb_helper);
2012 drm_client_framebuffer_delete(fb_helper->buffer);
2015 static void drm_fbdev_release(struct drm_fb_helper *fb_helper)
2017 drm_fbdev_cleanup(fb_helper);
2018 drm_client_release(&fb_helper->client);
2023 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end of
2024 * unregister_framebuffer() or fb_release().
2026 static void drm_fbdev_fb_destroy(struct fb_info *info)
2028 drm_fbdev_release(info->par);
2031 static int drm_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
2033 struct drm_fb_helper *fb_helper = info->par;
2035 if (fb_helper->dev->driver->gem_prime_mmap)
2036 return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma);
2041 static const struct fb_ops drm_fbdev_fb_ops = {
2042 .owner = THIS_MODULE,
2043 DRM_FB_HELPER_DEFAULT_OPS,
2044 .fb_open = drm_fbdev_fb_open,
2045 .fb_release = drm_fbdev_fb_release,
2046 .fb_destroy = drm_fbdev_fb_destroy,
2047 .fb_mmap = drm_fbdev_fb_mmap,
2048 .fb_read = drm_fb_helper_sys_read,
2049 .fb_write = drm_fb_helper_sys_write,
2050 .fb_fillrect = drm_fb_helper_sys_fillrect,
2051 .fb_copyarea = drm_fb_helper_sys_copyarea,
2052 .fb_imageblit = drm_fb_helper_sys_imageblit,
2055 static struct fb_deferred_io drm_fbdev_defio = {
2057 .deferred_io = drm_fb_helper_deferred_io,
2061 * This function uses the client API to create a framebuffer backed by a dumb buffer.
2063 * The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect,
2064 * fb_copyarea, fb_imageblit.
2066 static int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
2067 struct drm_fb_helper_surface_size *sizes)
2069 struct drm_client_dev *client = &fb_helper->client;
2070 struct drm_device *dev = fb_helper->dev;
2071 struct drm_client_buffer *buffer;
2072 struct drm_framebuffer *fb;
2073 struct fb_info *fbi;
2077 drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
2078 sizes->surface_width, sizes->surface_height,
2079 sizes->surface_bpp);
2081 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
2082 buffer = drm_client_framebuffer_create(client, sizes->surface_width,
2083 sizes->surface_height, format);
2085 return PTR_ERR(buffer);
2087 fb_helper->buffer = buffer;
2088 fb_helper->fb = buffer->fb;
2091 fbi = drm_fb_helper_alloc_fbi(fb_helper);
2093 return PTR_ERR(fbi);
2095 fbi->fbops = &drm_fbdev_fb_ops;
2096 fbi->screen_size = fb->height * fb->pitches[0];
2097 fbi->fix.smem_len = fbi->screen_size;
2099 drm_fb_helper_fill_info(fbi, fb_helper, sizes);
2101 if (drm_fbdev_use_shadow_fb(fb_helper)) {
2102 fbi->screen_buffer = vzalloc(fbi->screen_size);
2103 if (!fbi->screen_buffer)
2106 fbi->fbdefio = &drm_fbdev_defio;
2108 fb_deferred_io_init(fbi);
2110 /* buffer is mapped for HW framebuffer */
2111 vaddr = drm_client_buffer_vmap(fb_helper->buffer);
2113 return PTR_ERR(vaddr);
2115 fbi->screen_buffer = vaddr;
2116 /* Shamelessly leak the physical address to user-space */
2117 #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
2118 if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0)
2119 fbi->fix.smem_start =
2120 page_to_phys(virt_to_page(fbi->screen_buffer));
2127 static const struct drm_fb_helper_funcs drm_fb_helper_generic_funcs = {
2128 .fb_probe = drm_fb_helper_generic_probe,
2131 static void drm_fbdev_client_unregister(struct drm_client_dev *client)
2133 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2135 if (fb_helper->fbdev)
2136 /* drm_fbdev_fb_destroy() takes care of cleanup */
2137 drm_fb_helper_unregister_fbi(fb_helper);
2139 drm_fbdev_release(fb_helper);
2142 static int drm_fbdev_client_restore(struct drm_client_dev *client)
2144 drm_fb_helper_lastclose(client->dev);
2149 static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
2151 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2152 struct drm_device *dev = client->dev;
2155 /* Setup is not retried if it has failed */
2156 if (!fb_helper->dev && fb_helper->funcs)
2160 return drm_fb_helper_hotplug_event(dev->fb_helper);
2162 if (!dev->mode_config.num_connector) {
2163 drm_dbg_kms(dev, "No connectors found, will not create framebuffer!\n");
2167 drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
2169 ret = drm_fb_helper_init(dev, fb_helper);
2173 if (!drm_drv_uses_atomic_modeset(dev))
2174 drm_helper_disable_unused_functions(dev);
2176 ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp);
2183 drm_fbdev_cleanup(fb_helper);
2185 fb_helper->dev = NULL;
2186 fb_helper->fbdev = NULL;
2188 drm_err(dev, "fbdev: Failed to setup generic emulation (ret=%d)\n", ret);
2193 static const struct drm_client_funcs drm_fbdev_client_funcs = {
2194 .owner = THIS_MODULE,
2195 .unregister = drm_fbdev_client_unregister,
2196 .restore = drm_fbdev_client_restore,
2197 .hotplug = drm_fbdev_client_hotplug,
2201 * drm_fbdev_generic_setup() - Setup generic fbdev emulation
2203 * @preferred_bpp: Preferred bits per pixel for the device.
2204 * @dev->mode_config.preferred_depth is used if this is zero.
2206 * This function sets up generic fbdev emulation for drivers that supports
2207 * dumb buffers with a virtual address and that can be mmap'ed.
2208 * drm_fbdev_generic_setup() shall be called after the DRM driver registered
2209 * the new DRM device with drm_dev_register().
2211 * Restore, hotplug events and teardown are all taken care of. Drivers that do
2212 * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
2213 * Simple drivers might use drm_mode_config_helper_suspend().
2215 * Drivers that set the dirty callback on their framebuffer will get a shadow
2216 * fbdev buffer that is blitted onto the real buffer. This is done in order to
2217 * make deferred I/O work with all kinds of buffers. A shadow buffer can be
2218 * requested explicitly by setting struct drm_mode_config.prefer_shadow or
2219 * struct drm_mode_config.prefer_shadow_fbdev to true beforehand. This is
2220 * required to use generic fbdev emulation with SHMEM helpers.
2222 * This function is safe to call even when there are no connectors present.
2223 * Setup will be retried on the next hotplug event.
2225 * The fbdev is destroyed by drm_dev_unregister().
2227 void drm_fbdev_generic_setup(struct drm_device *dev,
2228 unsigned int preferred_bpp)
2230 struct drm_fb_helper *fb_helper;
2233 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
2234 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
2236 if (!drm_fbdev_emulation)
2239 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
2241 drm_err(dev, "Failed to allocate fb_helper\n");
2245 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
2248 drm_err(dev, "Failed to register client: %d\n", ret);
2253 preferred_bpp = dev->mode_config.preferred_depth;
2256 fb_helper->preferred_bpp = preferred_bpp;
2258 ret = drm_fbdev_client_hotplug(&fb_helper->client);
2260 drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
2262 drm_client_register(&fb_helper->client);
2264 EXPORT_SYMBOL(drm_fbdev_generic_setup);
2266 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2267 * but the module doesn't depend on any fb console symbols. At least
2268 * attempt to load fbcon to avoid leaving the system without a usable console.
2270 int __init drm_fb_helper_modinit(void)
2272 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2273 const char name[] = "fbcon";
2274 struct module *fbcon;
2276 mutex_lock(&module_mutex);
2277 fbcon = find_module(name);
2278 mutex_unlock(&module_mutex);
2281 request_module_nowait(name);
2285 EXPORT_SYMBOL(drm_fb_helper_modinit);