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/pci.h>
34 #include <linux/sysrq.h>
35 #include <linux/vga_switcheroo.h>
37 #include <drm/drm_atomic.h>
38 #include <drm/drm_drv.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_fourcc.h>
41 #include <drm/drm_framebuffer.h>
42 #include <drm/drm_modeset_helper_vtables.h>
43 #include <drm/drm_print.h>
44 #include <drm/drm_vblank.h>
46 #include "drm_internal.h"
48 static bool drm_fbdev_emulation = true;
49 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
50 MODULE_PARM_DESC(fbdev_emulation,
51 "Enable legacy fbdev emulation [default=true]");
53 static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
54 module_param(drm_fbdev_overalloc, int, 0444);
55 MODULE_PARM_DESC(drm_fbdev_overalloc,
56 "Overallocation of the fbdev buffer (%) [default="
57 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
60 * In order to keep user-space compatibility, we want in certain use-cases
61 * to keep leaking the fbdev physical address to the user-space program
62 * handling the fbdev buffer.
64 * This is a bad habit, essentially kept to support closed-source OpenGL
65 * drivers that should really be moved into open-source upstream projects
66 * instead of using legacy physical addresses in user space to communicate
67 * with other out-of-tree kernel modules.
69 * This module_param *should* be removed as soon as possible and be
70 * considered as a broken and legacy behaviour from a modern fbdev device.
72 static bool drm_leak_fbdev_smem;
73 #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
74 module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
75 MODULE_PARM_DESC(drm_leak_fbdev_smem,
76 "Allow unsafe leaking fbdev physical smem address [default=false]");
79 static LIST_HEAD(kernel_fb_helper_list);
80 static DEFINE_MUTEX(kernel_fb_helper_lock);
85 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
86 * mode setting driver. They can be used mostly independently from the crtc
87 * helper functions used by many drivers to implement the kernel mode setting
90 * Drivers that support a dumb buffer with a virtual address and mmap support,
91 * should try out the generic fbdev emulation using drm_fbdev_generic_setup().
92 * It will automatically set up deferred I/O if the driver requires a shadow
95 * Existing fbdev implementations should restore the fbdev console by using
96 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
97 * They should also notify the fb helper code from updates to the output
98 * configuration by using drm_fb_helper_output_poll_changed() as their
99 * &drm_mode_config_funcs.output_poll_changed callback. New implementations
100 * of fbdev should be build on top of struct &drm_client_funcs, which handles
101 * this automatically. Setting the old callbacks should be avoided.
103 * For suspend/resume consider using drm_mode_config_helper_suspend() and
104 * drm_mode_config_helper_resume() which takes care of fbdev as well.
106 * All other functions exported by the fb helper library can be used to
107 * implement the fbdev driver interface by the driver.
109 * It is possible, though perhaps somewhat tricky, to implement race-free
110 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
111 * helper must be called first to initialize the minimum required to make
112 * hotplug detection work. Drivers also need to make sure to properly set up
113 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
114 * it is safe to enable interrupts and start processing hotplug events. At the
115 * same time, drivers should initialize all modeset objects such as CRTCs,
116 * encoders and connectors. To finish up the fbdev helper initialization, the
117 * drm_fb_helper_init() function is called. To probe for all attached displays
118 * and set up an initial configuration using the detected hardware, drivers
119 * should call drm_fb_helper_initial_config().
121 * If &drm_framebuffer_funcs.dirty is set, the
122 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
123 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
124 * away. This worker then calls the dirty() function ensuring that it will
125 * always run in process context since the fb_*() function could be running in
126 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
127 * callback it will also schedule dirty_work with the damage collected from the
130 * Deferred I/O is not compatible with SHMEM. Such drivers should request an
131 * fbdev shadow buffer and call drm_fbdev_generic_setup() instead.
134 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
136 uint16_t *r_base, *g_base, *b_base;
138 if (crtc->funcs->gamma_set == NULL)
141 r_base = crtc->gamma_store;
142 g_base = r_base + crtc->gamma_size;
143 b_base = g_base + crtc->gamma_size;
145 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
146 crtc->gamma_size, NULL);
150 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
151 * @info: fbdev registered by the helper
153 int drm_fb_helper_debug_enter(struct fb_info *info)
155 struct drm_fb_helper *helper = info->par;
156 const struct drm_crtc_helper_funcs *funcs;
157 struct drm_mode_set *mode_set;
159 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
160 mutex_lock(&helper->client.modeset_mutex);
161 drm_client_for_each_modeset(mode_set, &helper->client) {
162 if (!mode_set->crtc->enabled)
165 funcs = mode_set->crtc->helper_private;
166 if (funcs->mode_set_base_atomic == NULL)
169 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
172 funcs->mode_set_base_atomic(mode_set->crtc,
176 ENTER_ATOMIC_MODE_SET);
178 mutex_unlock(&helper->client.modeset_mutex);
183 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
186 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
187 * @info: fbdev registered by the helper
189 int drm_fb_helper_debug_leave(struct fb_info *info)
191 struct drm_fb_helper *helper = info->par;
192 struct drm_client_dev *client = &helper->client;
193 struct drm_device *dev = helper->dev;
194 struct drm_crtc *crtc;
195 const struct drm_crtc_helper_funcs *funcs;
196 struct drm_mode_set *mode_set;
197 struct drm_framebuffer *fb;
199 mutex_lock(&client->modeset_mutex);
200 drm_client_for_each_modeset(mode_set, client) {
201 crtc = mode_set->crtc;
202 if (drm_drv_uses_atomic_modeset(crtc->dev))
205 funcs = crtc->helper_private;
206 fb = crtc->primary->fb;
212 drm_err(dev, "no fb to restore?\n");
216 if (funcs->mode_set_base_atomic == NULL)
219 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
220 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
221 crtc->y, LEAVE_ATOMIC_MODE_SET);
223 mutex_unlock(&client->modeset_mutex);
227 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
230 __drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
236 if (!drm_fbdev_emulation || !fb_helper)
239 if (READ_ONCE(fb_helper->deferred_setup))
242 mutex_lock(&fb_helper->lock);
245 * Yes this is the _locked version which expects the master lock
246 * to be held. But for forced restores we're intentionally
247 * racing here, see drm_fb_helper_set_par().
249 ret = drm_client_modeset_commit_locked(&fb_helper->client);
251 ret = drm_client_modeset_commit(&fb_helper->client);
254 do_delayed = fb_helper->delayed_hotplug;
256 fb_helper->delayed_hotplug = false;
257 mutex_unlock(&fb_helper->lock);
260 drm_fb_helper_hotplug_event(fb_helper);
266 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
267 * @fb_helper: driver-allocated fbdev helper, can be NULL
269 * This should be called from driver's drm &drm_driver.lastclose callback
270 * when implementing an fbcon on top of kms using this helper. This ensures that
271 * the user isn't greeted with a black screen when e.g. X dies.
274 * Zero if everything went ok, negative error code otherwise.
276 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
278 return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
280 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
282 #ifdef CONFIG_MAGIC_SYSRQ
283 /* emergency restore, don't bother with error reporting */
284 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
286 struct drm_fb_helper *helper;
288 mutex_lock(&kernel_fb_helper_lock);
289 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
290 struct drm_device *dev = helper->dev;
292 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
295 mutex_lock(&helper->lock);
296 drm_client_modeset_commit_locked(&helper->client);
297 mutex_unlock(&helper->lock);
299 mutex_unlock(&kernel_fb_helper_lock);
302 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
304 static void drm_fb_helper_sysrq(int dummy1)
306 schedule_work(&drm_fb_helper_restore_work);
309 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
310 .handler = drm_fb_helper_sysrq,
311 .help_msg = "force-fb(v)",
312 .action_msg = "Restore framebuffer console",
315 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
318 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
320 struct drm_fb_helper *fb_helper = info->par;
322 mutex_lock(&fb_helper->lock);
323 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
324 mutex_unlock(&fb_helper->lock);
328 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
329 * @blank: desired blanking state
330 * @info: fbdev registered by the helper
332 int drm_fb_helper_blank(int blank, struct fb_info *info)
334 if (oops_in_progress)
338 /* Display: On; HSync: On, VSync: On */
339 case FB_BLANK_UNBLANK:
340 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
342 /* Display: Off; HSync: On, VSync: On */
343 case FB_BLANK_NORMAL:
344 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
346 /* Display: Off; HSync: Off, VSync: On */
347 case FB_BLANK_HSYNC_SUSPEND:
348 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
350 /* Display: Off; HSync: On, VSync: Off */
351 case FB_BLANK_VSYNC_SUSPEND:
352 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
354 /* Display: Off; HSync: Off, VSync: Off */
355 case FB_BLANK_POWERDOWN:
356 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
361 EXPORT_SYMBOL(drm_fb_helper_blank);
363 static void drm_fb_helper_resume_worker(struct work_struct *work)
365 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
369 fb_set_suspend(helper->info, 0);
373 static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
375 struct drm_device *dev = helper->dev;
376 struct drm_clip_rect *clip = &helper->damage_clip;
377 struct drm_clip_rect clip_copy;
381 if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty))
384 spin_lock_irqsave(&helper->damage_lock, flags);
386 clip->x1 = clip->y1 = ~0;
387 clip->x2 = clip->y2 = 0;
388 spin_unlock_irqrestore(&helper->damage_lock, flags);
390 ret = helper->funcs->fb_dirty(helper, &clip_copy);
398 * Restore damage clip rectangle on errors. The next run
399 * of the damage worker will perform the update.
401 spin_lock_irqsave(&helper->damage_lock, flags);
402 clip->x1 = min_t(u32, clip->x1, clip_copy.x1);
403 clip->y1 = min_t(u32, clip->y1, clip_copy.y1);
404 clip->x2 = max_t(u32, clip->x2, clip_copy.x2);
405 clip->y2 = max_t(u32, clip->y2, clip_copy.y2);
406 spin_unlock_irqrestore(&helper->damage_lock, flags);
409 static void drm_fb_helper_damage_work(struct work_struct *work)
411 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
413 drm_fb_helper_fb_dirty(helper);
417 * drm_fb_helper_prepare - setup a drm_fb_helper structure
419 * @helper: driver-allocated fbdev helper structure to set up
420 * @preferred_bpp: Preferred bits per pixel for the device.
421 * @funcs: pointer to structure of functions associate with this helper
423 * Sets up the bare minimum to make the framebuffer helper usable. This is
424 * useful to implement race-free initialization of the polling helpers.
426 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
427 unsigned int preferred_bpp,
428 const struct drm_fb_helper_funcs *funcs)
431 * Pick a preferred bpp of 32 if no value has been given. This
432 * will select XRGB8888 for the framebuffer formats. All drivers
433 * have to support XRGB8888 for backwards compatibility with legacy
434 * userspace, so it's the safe choice here.
436 * TODO: Replace struct drm_mode_config.preferred_depth and this
437 * bpp value with a preferred format that is given as struct
438 * drm_format_info. Then derive all other values from the
444 INIT_LIST_HEAD(&helper->kernel_fb_list);
445 spin_lock_init(&helper->damage_lock);
446 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
447 INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
448 helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
449 mutex_init(&helper->lock);
450 helper->funcs = funcs;
452 helper->preferred_bpp = preferred_bpp;
454 EXPORT_SYMBOL(drm_fb_helper_prepare);
457 * drm_fb_helper_unprepare - clean up a drm_fb_helper structure
458 * @fb_helper: driver-allocated fbdev helper structure to set up
460 * Cleans up the framebuffer helper. Inverse of drm_fb_helper_prepare().
462 void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper)
464 mutex_destroy(&fb_helper->lock);
466 EXPORT_SYMBOL(drm_fb_helper_unprepare);
469 * drm_fb_helper_init - initialize a &struct drm_fb_helper
471 * @fb_helper: driver-allocated fbdev helper structure to initialize
473 * This allocates the structures for the fbdev helper with the given limits.
474 * Note that this won't yet touch the hardware (through the driver interfaces)
475 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
476 * to allow driver writes more control over the exact init sequence.
478 * Drivers must call drm_fb_helper_prepare() before calling this function.
481 * Zero if everything went ok, nonzero otherwise.
483 int drm_fb_helper_init(struct drm_device *dev,
484 struct drm_fb_helper *fb_helper)
489 * If this is not the generic fbdev client, initialize a drm_client
490 * without callbacks so we can use the modesets.
492 if (!fb_helper->client.funcs) {
493 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
498 dev->fb_helper = fb_helper;
502 EXPORT_SYMBOL(drm_fb_helper_init);
505 * drm_fb_helper_alloc_info - allocate fb_info and some of its members
506 * @fb_helper: driver-allocated fbdev helper
508 * A helper to alloc fb_info and the member cmap. Called by the driver
509 * within the fb_probe fb_helper callback function. Drivers do not
510 * need to release the allocated fb_info structure themselves, this is
511 * automatically done when calling drm_fb_helper_fini().
514 * fb_info pointer if things went okay, pointer containing error code
517 struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper)
519 struct device *dev = fb_helper->dev->dev;
520 struct fb_info *info;
523 info = framebuffer_alloc(0, dev);
525 return ERR_PTR(-ENOMEM);
527 ret = fb_alloc_cmap(&info->cmap, 256, 0);
531 fb_helper->info = info;
532 info->skip_vt_switch = true;
537 framebuffer_release(info);
540 EXPORT_SYMBOL(drm_fb_helper_alloc_info);
543 * drm_fb_helper_release_info - release fb_info and its members
544 * @fb_helper: driver-allocated fbdev helper
546 * A helper to release fb_info and the member cmap. Drivers do not
547 * need to release the allocated fb_info structure themselves, this is
548 * automatically done when calling drm_fb_helper_fini().
550 void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper)
552 struct fb_info *info = fb_helper->info;
557 fb_helper->info = NULL;
560 fb_dealloc_cmap(&info->cmap);
561 framebuffer_release(info);
563 EXPORT_SYMBOL(drm_fb_helper_release_info);
566 * drm_fb_helper_unregister_info - unregister fb_info framebuffer device
567 * @fb_helper: driver-allocated fbdev helper, can be NULL
569 * A wrapper around unregister_framebuffer, to release the fb_info
570 * framebuffer device. This must be called before releasing all resources for
571 * @fb_helper by calling drm_fb_helper_fini().
573 void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper)
575 if (fb_helper && fb_helper->info)
576 unregister_framebuffer(fb_helper->info);
578 EXPORT_SYMBOL(drm_fb_helper_unregister_info);
581 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
582 * @fb_helper: driver-allocated fbdev helper, can be NULL
584 * This cleans up all remaining resources associated with @fb_helper.
586 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
591 fb_helper->dev->fb_helper = NULL;
593 if (!drm_fbdev_emulation)
596 cancel_work_sync(&fb_helper->resume_work);
597 cancel_work_sync(&fb_helper->damage_work);
599 drm_fb_helper_release_info(fb_helper);
601 mutex_lock(&kernel_fb_helper_lock);
602 if (!list_empty(&fb_helper->kernel_fb_list)) {
603 list_del(&fb_helper->kernel_fb_list);
604 if (list_empty(&kernel_fb_helper_list))
605 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
607 mutex_unlock(&kernel_fb_helper_lock);
609 if (!fb_helper->client.funcs)
610 drm_client_release(&fb_helper->client);
612 EXPORT_SYMBOL(drm_fb_helper_fini);
614 static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u32 y,
615 u32 width, u32 height)
617 struct drm_clip_rect *clip = &helper->damage_clip;
620 spin_lock_irqsave(&helper->damage_lock, flags);
621 clip->x1 = min_t(u32, clip->x1, x);
622 clip->y1 = min_t(u32, clip->y1, y);
623 clip->x2 = max_t(u32, clip->x2, x + width);
624 clip->y2 = max_t(u32, clip->y2, y + height);
625 spin_unlock_irqrestore(&helper->damage_lock, flags);
628 static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
629 u32 width, u32 height)
631 drm_fb_helper_add_damage_clip(helper, x, y, width, height);
633 schedule_work(&helper->damage_work);
637 * Convert memory region into area of scanlines and pixels per
638 * scanline. The parameters off and len must not reach beyond
639 * the end of the framebuffer.
641 static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len,
642 struct drm_rect *clip)
644 u32 line_length = info->fix.line_length;
645 u32 fb_height = info->var.yres;
646 off_t end = off + len;
648 u32 y1 = off / line_length;
649 u32 x2 = info->var.xres;
650 u32 y2 = DIV_ROUND_UP(end, line_length);
652 /* Don't allow any of them beyond the bottom bound of display area */
658 if ((y2 - y1) == 1) {
660 * We've only written to a single scanline. Try to reduce
661 * the number of horizontal pixels that need an update.
663 off_t bit_off = (off % line_length) * 8;
664 off_t bit_end = (end % line_length) * 8;
666 x1 = bit_off / info->var.bits_per_pixel;
667 x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel);
670 drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1);
674 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
675 * @info: fb_info struct pointer
676 * @pagereflist: list of mmap framebuffer pages that have to be flushed
678 * This function is used as the &fb_deferred_io.deferred_io
679 * callback function for flushing the fbdev mmap writes.
681 void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist)
683 struct drm_fb_helper *helper = info->par;
684 unsigned long start, end, min_off, max_off, total_size;
685 struct fb_deferred_io_pageref *pageref;
686 struct drm_rect damage_area;
690 list_for_each_entry(pageref, pagereflist, list) {
691 start = pageref->offset;
692 end = start + PAGE_SIZE;
693 min_off = min(min_off, start);
694 max_off = max(max_off, end);
698 * As we can only track pages, we might reach beyond the end
699 * of the screen and account for non-existing scanlines. Hence,
700 * keep the covered memory area within the screen buffer.
702 if (info->screen_size)
703 total_size = info->screen_size;
705 total_size = info->fix.smem_len;
706 max_off = min(max_off, total_size);
708 if (min_off < max_off) {
709 drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area);
710 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
711 drm_rect_width(&damage_area),
712 drm_rect_height(&damage_area));
715 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
717 typedef ssize_t (*drm_fb_helper_read_screen)(struct fb_info *info, char __user *buf,
718 size_t count, loff_t pos);
720 static ssize_t __drm_fb_helper_read(struct fb_info *info, char __user *buf, size_t count,
721 loff_t *ppos, drm_fb_helper_read_screen read_screen)
727 if (info->screen_size)
728 total_size = info->screen_size;
730 total_size = info->fix.smem_len;
732 if (pos >= total_size)
734 if (count >= total_size)
736 if (total_size - count < pos)
737 count = total_size - pos;
739 if (info->fbops->fb_sync)
740 info->fbops->fb_sync(info);
742 ret = read_screen(info, buf, count, pos);
749 typedef ssize_t (*drm_fb_helper_write_screen)(struct fb_info *info, const char __user *buf,
750 size_t count, loff_t pos);
752 static ssize_t __drm_fb_helper_write(struct fb_info *info, const char __user *buf, size_t count,
753 loff_t *ppos, drm_fb_helper_write_screen write_screen)
760 if (info->screen_size)
761 total_size = info->screen_size;
763 total_size = info->fix.smem_len;
765 if (pos > total_size)
767 if (count > total_size) {
771 if (total_size - count < pos) {
774 count = total_size - pos;
777 if (info->fbops->fb_sync)
778 info->fbops->fb_sync(info);
781 * Copy to framebuffer even if we already logged an error. Emulates
782 * the behavior of the original fbdev implementation.
784 ret = write_screen(info, buf, count, pos);
786 return ret; /* return last error, if any */
788 return err; /* return previous error, if any */
795 static ssize_t drm_fb_helper_read_screen_buffer(struct fb_info *info, char __user *buf,
796 size_t count, loff_t pos)
798 const char *src = info->screen_buffer + pos;
800 if (copy_to_user(buf, src, count))
807 * drm_fb_helper_sys_read - Implements struct &fb_ops.fb_read for system memory
808 * @info: fb_info struct pointer
809 * @buf: userspace buffer to read from framebuffer memory
810 * @count: number of bytes to read from framebuffer memory
811 * @ppos: read offset within framebuffer memory
814 * The number of bytes read on success, or an error code otherwise.
816 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
817 size_t count, loff_t *ppos)
819 return __drm_fb_helper_read(info, buf, count, ppos, drm_fb_helper_read_screen_buffer);
821 EXPORT_SYMBOL(drm_fb_helper_sys_read);
823 static ssize_t drm_fb_helper_write_screen_buffer(struct fb_info *info, const char __user *buf,
824 size_t count, loff_t pos)
826 char *dst = info->screen_buffer + pos;
828 if (copy_from_user(dst, buf, count))
835 * drm_fb_helper_sys_write - Implements struct &fb_ops.fb_write for system memory
836 * @info: fb_info struct pointer
837 * @buf: userspace buffer to write to framebuffer memory
838 * @count: number of bytes to write to framebuffer memory
839 * @ppos: write offset within framebuffer memory
842 * The number of bytes written on success, or an error code otherwise.
844 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
845 size_t count, loff_t *ppos)
847 struct drm_fb_helper *helper = info->par;
850 struct drm_rect damage_area;
852 ret = __drm_fb_helper_write(info, buf, count, ppos, drm_fb_helper_write_screen_buffer);
856 if (helper->funcs->fb_dirty) {
857 drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
858 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
859 drm_rect_width(&damage_area),
860 drm_rect_height(&damage_area));
865 EXPORT_SYMBOL(drm_fb_helper_sys_write);
868 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
869 * @info: fbdev registered by the helper
870 * @rect: info about rectangle to fill
872 * A wrapper around sys_fillrect implemented by fbdev core
874 void drm_fb_helper_sys_fillrect(struct fb_info *info,
875 const struct fb_fillrect *rect)
877 struct drm_fb_helper *helper = info->par;
879 sys_fillrect(info, rect);
881 if (helper->funcs->fb_dirty)
882 drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
884 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
887 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
888 * @info: fbdev registered by the helper
889 * @area: info about area to copy
891 * A wrapper around sys_copyarea implemented by fbdev core
893 void drm_fb_helper_sys_copyarea(struct fb_info *info,
894 const struct fb_copyarea *area)
896 struct drm_fb_helper *helper = info->par;
898 sys_copyarea(info, area);
900 if (helper->funcs->fb_dirty)
901 drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
903 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
906 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
907 * @info: fbdev registered by the helper
908 * @image: info about image to blit
910 * A wrapper around sys_imageblit implemented by fbdev core
912 void drm_fb_helper_sys_imageblit(struct fb_info *info,
913 const struct fb_image *image)
915 struct drm_fb_helper *helper = info->par;
917 sys_imageblit(info, image);
919 if (helper->funcs->fb_dirty)
920 drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
922 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
924 static ssize_t fb_read_screen_base(struct fb_info *info, char __user *buf, size_t count,
927 const char __iomem *src = info->screen_base + pos;
928 size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
933 tmp = kmalloc(alloc_size, GFP_KERNEL);
938 size_t c = min_t(size_t, count, alloc_size);
940 memcpy_fromio(tmp, src, c);
941 if (copy_to_user(buf, tmp, c)) {
954 return ret ? ret : err;
958 * drm_fb_helper_cfb_read - Implements struct &fb_ops.fb_read for I/O memory
959 * @info: fb_info struct pointer
960 * @buf: userspace buffer to read from framebuffer memory
961 * @count: number of bytes to read from framebuffer memory
962 * @ppos: read offset within framebuffer memory
965 * The number of bytes read on success, or an error code otherwise.
967 ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
968 size_t count, loff_t *ppos)
970 return __drm_fb_helper_read(info, buf, count, ppos, fb_read_screen_base);
972 EXPORT_SYMBOL(drm_fb_helper_cfb_read);
974 static ssize_t fb_write_screen_base(struct fb_info *info, const char __user *buf, size_t count,
977 char __iomem *dst = info->screen_base + pos;
978 size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
983 tmp = kmalloc(alloc_size, GFP_KERNEL);
988 size_t c = min_t(size_t, count, alloc_size);
990 if (copy_from_user(tmp, buf, c)) {
994 memcpy_toio(dst, tmp, c);
1004 return ret ? ret : err;
1008 * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O memory
1009 * @info: fb_info struct pointer
1010 * @buf: userspace buffer to write to framebuffer memory
1011 * @count: number of bytes to write to framebuffer memory
1012 * @ppos: write offset within framebuffer memory
1015 * The number of bytes written on success, or an error code otherwise.
1017 ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
1018 size_t count, loff_t *ppos)
1020 struct drm_fb_helper *helper = info->par;
1023 struct drm_rect damage_area;
1025 ret = __drm_fb_helper_write(info, buf, count, ppos, fb_write_screen_base);
1029 if (helper->funcs->fb_dirty) {
1030 drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
1031 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
1032 drm_rect_width(&damage_area),
1033 drm_rect_height(&damage_area));
1038 EXPORT_SYMBOL(drm_fb_helper_cfb_write);
1041 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1042 * @info: fbdev registered by the helper
1043 * @rect: info about rectangle to fill
1045 * A wrapper around cfb_fillrect implemented by fbdev core
1047 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1048 const struct fb_fillrect *rect)
1050 struct drm_fb_helper *helper = info->par;
1052 cfb_fillrect(info, rect);
1054 if (helper->funcs->fb_dirty)
1055 drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
1057 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1060 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1061 * @info: fbdev registered by the helper
1062 * @area: info about area to copy
1064 * A wrapper around cfb_copyarea implemented by fbdev core
1066 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1067 const struct fb_copyarea *area)
1069 struct drm_fb_helper *helper = info->par;
1071 cfb_copyarea(info, area);
1073 if (helper->funcs->fb_dirty)
1074 drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
1076 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1079 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1080 * @info: fbdev registered by the helper
1081 * @image: info about image to blit
1083 * A wrapper around cfb_imageblit implemented by fbdev core
1085 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1086 const struct fb_image *image)
1088 struct drm_fb_helper *helper = info->par;
1090 cfb_imageblit(info, image);
1092 if (helper->funcs->fb_dirty)
1093 drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
1095 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1098 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1099 * @fb_helper: driver-allocated fbdev helper, can be NULL
1100 * @suspend: whether to suspend or resume
1102 * A wrapper around fb_set_suspend implemented by fbdev core.
1103 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1106 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1108 if (fb_helper && fb_helper->info)
1109 fb_set_suspend(fb_helper->info, suspend);
1111 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1114 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1115 * takes the console lock
1116 * @fb_helper: driver-allocated fbdev helper, can be NULL
1117 * @suspend: whether to suspend or resume
1119 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1120 * isn't available on resume, a worker is tasked with waiting for the lock
1121 * to become available. The console lock can be pretty contented on resume
1122 * due to all the printk activity.
1124 * This function can be called multiple times with the same state since
1125 * &fb_info.state is checked to see if fbdev is running or not before locking.
1127 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1129 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1132 if (!fb_helper || !fb_helper->info)
1135 /* make sure there's no pending/ongoing resume */
1136 flush_work(&fb_helper->resume_work);
1139 if (fb_helper->info->state != FBINFO_STATE_RUNNING)
1145 if (fb_helper->info->state == FBINFO_STATE_RUNNING)
1148 if (!console_trylock()) {
1149 schedule_work(&fb_helper->resume_work);
1154 fb_set_suspend(fb_helper->info, suspend);
1157 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1159 static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
1161 u32 *palette = (u32 *)info->pseudo_palette;
1164 if (cmap->start + cmap->len > 16)
1167 for (i = 0; i < cmap->len; ++i) {
1168 u16 red = cmap->red[i];
1169 u16 green = cmap->green[i];
1170 u16 blue = cmap->blue[i];
1173 red >>= 16 - info->var.red.length;
1174 green >>= 16 - info->var.green.length;
1175 blue >>= 16 - info->var.blue.length;
1176 value = (red << info->var.red.offset) |
1177 (green << info->var.green.offset) |
1178 (blue << info->var.blue.offset);
1179 if (info->var.transp.length > 0) {
1180 u32 mask = (1 << info->var.transp.length) - 1;
1182 mask <<= info->var.transp.offset;
1185 palette[cmap->start + i] = value;
1191 static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
1193 struct drm_fb_helper *fb_helper = info->par;
1194 struct drm_mode_set *modeset;
1195 struct drm_crtc *crtc;
1199 drm_modeset_lock_all(fb_helper->dev);
1200 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1201 crtc = modeset->crtc;
1202 if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
1207 if (cmap->start + cmap->len > crtc->gamma_size) {
1212 r = crtc->gamma_store;
1213 g = r + crtc->gamma_size;
1214 b = g + crtc->gamma_size;
1216 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1217 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1218 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1220 ret = crtc->funcs->gamma_set(crtc, r, g, b,
1221 crtc->gamma_size, NULL);
1226 drm_modeset_unlock_all(fb_helper->dev);
1231 static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
1232 struct fb_cmap *cmap)
1234 struct drm_device *dev = crtc->dev;
1235 struct drm_property_blob *gamma_lut;
1236 struct drm_color_lut *lut;
1237 int size = crtc->gamma_size;
1240 if (!size || cmap->start + cmap->len > size)
1241 return ERR_PTR(-EINVAL);
1243 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
1244 if (IS_ERR(gamma_lut))
1247 lut = gamma_lut->data;
1248 if (cmap->start || cmap->len != size) {
1249 u16 *r = crtc->gamma_store;
1250 u16 *g = r + crtc->gamma_size;
1251 u16 *b = g + crtc->gamma_size;
1253 for (i = 0; i < cmap->start; i++) {
1255 lut[i].green = g[i];
1258 for (i = cmap->start + cmap->len; i < size; i++) {
1260 lut[i].green = g[i];
1265 for (i = 0; i < cmap->len; i++) {
1266 lut[cmap->start + i].red = cmap->red[i];
1267 lut[cmap->start + i].green = cmap->green[i];
1268 lut[cmap->start + i].blue = cmap->blue[i];
1274 static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
1276 struct drm_fb_helper *fb_helper = info->par;
1277 struct drm_device *dev = fb_helper->dev;
1278 struct drm_property_blob *gamma_lut = NULL;
1279 struct drm_modeset_acquire_ctx ctx;
1280 struct drm_crtc_state *crtc_state;
1281 struct drm_atomic_state *state;
1282 struct drm_mode_set *modeset;
1283 struct drm_crtc *crtc;
1288 drm_modeset_acquire_init(&ctx, 0);
1290 state = drm_atomic_state_alloc(dev);
1296 state->acquire_ctx = &ctx;
1298 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1299 crtc = modeset->crtc;
1302 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
1303 if (IS_ERR(gamma_lut)) {
1304 ret = PTR_ERR(gamma_lut);
1309 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1310 if (IS_ERR(crtc_state)) {
1311 ret = PTR_ERR(crtc_state);
1316 * FIXME: This always uses gamma_lut. Some HW have only
1317 * degamma_lut, in which case we should reset gamma_lut and set
1318 * degamma_lut. See drm_crtc_legacy_gamma_set().
1320 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
1322 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
1323 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
1325 crtc_state->color_mgmt_changed |= replaced;
1328 ret = drm_atomic_commit(state);
1332 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1333 crtc = modeset->crtc;
1335 r = crtc->gamma_store;
1336 g = r + crtc->gamma_size;
1337 b = g + crtc->gamma_size;
1339 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1340 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1341 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1345 if (ret == -EDEADLK)
1348 drm_property_blob_put(gamma_lut);
1349 drm_atomic_state_put(state);
1351 drm_modeset_drop_locks(&ctx);
1352 drm_modeset_acquire_fini(&ctx);
1357 drm_atomic_state_clear(state);
1358 drm_modeset_backoff(&ctx);
1363 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1364 * @cmap: cmap to set
1365 * @info: fbdev registered by the helper
1367 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1369 struct drm_fb_helper *fb_helper = info->par;
1370 struct drm_device *dev = fb_helper->dev;
1373 if (oops_in_progress)
1376 mutex_lock(&fb_helper->lock);
1378 if (!drm_master_internal_acquire(dev)) {
1383 mutex_lock(&fb_helper->client.modeset_mutex);
1384 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1385 ret = setcmap_pseudo_palette(cmap, info);
1386 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1387 ret = setcmap_atomic(cmap, info);
1389 ret = setcmap_legacy(cmap, info);
1390 mutex_unlock(&fb_helper->client.modeset_mutex);
1392 drm_master_internal_release(dev);
1394 mutex_unlock(&fb_helper->lock);
1398 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1401 * drm_fb_helper_ioctl - legacy ioctl implementation
1402 * @info: fbdev registered by the helper
1403 * @cmd: ioctl command
1404 * @arg: ioctl argument
1406 * A helper to implement the standard fbdev ioctl. Only
1407 * FBIO_WAITFORVSYNC is implemented for now.
1409 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1412 struct drm_fb_helper *fb_helper = info->par;
1413 struct drm_device *dev = fb_helper->dev;
1414 struct drm_crtc *crtc;
1417 mutex_lock(&fb_helper->lock);
1418 if (!drm_master_internal_acquire(dev)) {
1424 case FBIO_WAITFORVSYNC:
1426 * Only consider the first CRTC.
1428 * This ioctl is supposed to take the CRTC number as
1429 * an argument, but in fbdev times, what that number
1430 * was supposed to be was quite unclear, different
1431 * drivers were passing that argument differently
1432 * (some by reference, some by value), and most of the
1433 * userspace applications were just hardcoding 0 as an
1436 * The first CRTC should be the integrated panel on
1437 * most drivers, so this is the best choice we can
1438 * make. If we're not smart enough here, one should
1439 * just consider switch the userspace to KMS.
1441 crtc = fb_helper->client.modesets[0].crtc;
1444 * Only wait for a vblank event if the CRTC is
1445 * enabled, otherwise just don't do anythintg,
1446 * not even report an error.
1448 ret = drm_crtc_vblank_get(crtc);
1450 drm_crtc_wait_one_vblank(crtc);
1451 drm_crtc_vblank_put(crtc);
1460 drm_master_internal_release(dev);
1462 mutex_unlock(&fb_helper->lock);
1465 EXPORT_SYMBOL(drm_fb_helper_ioctl);
1467 static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1468 const struct fb_var_screeninfo *var_2)
1470 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1471 var_1->grayscale == var_2->grayscale &&
1472 var_1->red.offset == var_2->red.offset &&
1473 var_1->red.length == var_2->red.length &&
1474 var_1->red.msb_right == var_2->red.msb_right &&
1475 var_1->green.offset == var_2->green.offset &&
1476 var_1->green.length == var_2->green.length &&
1477 var_1->green.msb_right == var_2->green.msb_right &&
1478 var_1->blue.offset == var_2->blue.offset &&
1479 var_1->blue.length == var_2->blue.length &&
1480 var_1->blue.msb_right == var_2->blue.msb_right &&
1481 var_1->transp.offset == var_2->transp.offset &&
1482 var_1->transp.length == var_2->transp.length &&
1483 var_1->transp.msb_right == var_2->transp.msb_right;
1486 static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1487 const struct drm_format_info *format)
1489 u8 depth = format->depth;
1491 if (format->is_color_indexed) {
1492 var->red.offset = 0;
1493 var->green.offset = 0;
1494 var->blue.offset = 0;
1495 var->red.length = depth;
1496 var->green.length = depth;
1497 var->blue.length = depth;
1498 var->transp.offset = 0;
1499 var->transp.length = 0;
1505 var->red.offset = 10;
1506 var->green.offset = 5;
1507 var->blue.offset = 0;
1508 var->red.length = 5;
1509 var->green.length = 5;
1510 var->blue.length = 5;
1511 var->transp.offset = 15;
1512 var->transp.length = 1;
1515 var->red.offset = 11;
1516 var->green.offset = 5;
1517 var->blue.offset = 0;
1518 var->red.length = 5;
1519 var->green.length = 6;
1520 var->blue.length = 5;
1521 var->transp.offset = 0;
1524 var->red.offset = 16;
1525 var->green.offset = 8;
1526 var->blue.offset = 0;
1527 var->red.length = 8;
1528 var->green.length = 8;
1529 var->blue.length = 8;
1530 var->transp.offset = 0;
1531 var->transp.length = 0;
1534 var->red.offset = 16;
1535 var->green.offset = 8;
1536 var->blue.offset = 0;
1537 var->red.length = 8;
1538 var->green.length = 8;
1539 var->blue.length = 8;
1540 var->transp.offset = 24;
1541 var->transp.length = 8;
1548 static void __fill_var(struct fb_var_screeninfo *var, struct fb_info *info,
1549 struct drm_framebuffer *fb)
1553 var->xres_virtual = fb->width;
1554 var->yres_virtual = fb->height;
1555 var->accel_flags = 0;
1556 var->bits_per_pixel = drm_format_info_bpp(fb->format, 0);
1558 var->height = info->var.height;
1559 var->width = info->var.width;
1561 var->left_margin = var->right_margin = 0;
1562 var->upper_margin = var->lower_margin = 0;
1563 var->hsync_len = var->vsync_len = 0;
1564 var->sync = var->vmode = 0;
1566 var->colorspace = 0;
1567 for (i = 0; i < 4; i++)
1568 var->reserved[i] = 0;
1572 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1573 * @var: screeninfo to check
1574 * @info: fbdev registered by the helper
1576 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1577 struct fb_info *info)
1579 struct drm_fb_helper *fb_helper = info->par;
1580 struct drm_framebuffer *fb = fb_helper->fb;
1581 const struct drm_format_info *format = fb->format;
1582 struct drm_device *dev = fb_helper->dev;
1585 if (in_dbg_master())
1588 if (var->pixclock != 0) {
1589 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1593 switch (format->format) {
1597 /* supported format with sub-byte pixels */
1601 if ((drm_format_info_block_width(format, 0) > 1) ||
1602 (drm_format_info_block_height(format, 0) > 1))
1608 * Changes struct fb_var_screeninfo are currently not pushed back
1609 * to KMS, hence fail if different settings are requested.
1611 bpp = drm_format_info_bpp(format, 0);
1612 if (var->bits_per_pixel > bpp ||
1613 var->xres > fb->width || var->yres > fb->height ||
1614 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1615 drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
1616 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1617 var->xres, var->yres, var->bits_per_pixel,
1618 var->xres_virtual, var->yres_virtual,
1619 fb->width, fb->height, bpp);
1623 __fill_var(var, info, fb);
1626 * fb_pan_display() validates this, but fb_set_par() doesn't and just
1627 * falls over. Note that __fill_var above adjusts y/res_virtual.
1629 if (var->yoffset > var->yres_virtual - var->yres ||
1630 var->xoffset > var->xres_virtual - var->xres)
1633 /* We neither support grayscale nor FOURCC (also stored in here). */
1634 if (var->grayscale > 0)
1641 * Workaround for SDL 1.2, which is known to be setting all pixel format
1642 * fields values to zero in some cases. We treat this situation as a
1643 * kind of "use some reasonable autodetected values".
1645 if (!var->red.offset && !var->green.offset &&
1646 !var->blue.offset && !var->transp.offset &&
1647 !var->red.length && !var->green.length &&
1648 !var->blue.length && !var->transp.length &&
1649 !var->red.msb_right && !var->green.msb_right &&
1650 !var->blue.msb_right && !var->transp.msb_right) {
1651 drm_fb_helper_fill_pixel_fmt(var, format);
1655 * drm fbdev emulation doesn't support changing the pixel format at all,
1656 * so reject all pixel format changing requests.
1658 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1659 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n");
1665 EXPORT_SYMBOL(drm_fb_helper_check_var);
1668 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1669 * @info: fbdev registered by the helper
1671 * This will let fbcon do the mode init and is called at initialization time by
1672 * the fbdev core when registering the driver, and later on through the hotplug
1675 int drm_fb_helper_set_par(struct fb_info *info)
1677 struct drm_fb_helper *fb_helper = info->par;
1678 struct fb_var_screeninfo *var = &info->var;
1681 if (oops_in_progress)
1685 * Normally we want to make sure that a kms master takes precedence over
1686 * fbdev, to avoid fbdev flickering and occasionally stealing the
1687 * display status. But Xorg first sets the vt back to text mode using
1688 * the KDSET IOCTL with KD_TEXT, and only after that drops the master
1689 * status when exiting.
1691 * In the past this was caught by drm_fb_helper_lastclose(), but on
1692 * modern systems where logind always keeps a drm fd open to orchestrate
1693 * the vt switching, this doesn't work.
1695 * To not break the userspace ABI we have this special case here, which
1696 * is only used for the above case. Everything else uses the normal
1697 * commit function, which ensures that we never steal the display from
1698 * an active drm master.
1700 force = var->activate & FB_ACTIVATE_KD_TEXT;
1702 __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force);
1706 EXPORT_SYMBOL(drm_fb_helper_set_par);
1708 static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
1710 struct drm_mode_set *mode_set;
1712 mutex_lock(&fb_helper->client.modeset_mutex);
1713 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1717 mutex_unlock(&fb_helper->client.modeset_mutex);
1720 static int pan_display_atomic(struct fb_var_screeninfo *var,
1721 struct fb_info *info)
1723 struct drm_fb_helper *fb_helper = info->par;
1726 pan_set(fb_helper, var->xoffset, var->yoffset);
1728 ret = drm_client_modeset_commit_locked(&fb_helper->client);
1730 info->var.xoffset = var->xoffset;
1731 info->var.yoffset = var->yoffset;
1733 pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
1738 static int pan_display_legacy(struct fb_var_screeninfo *var,
1739 struct fb_info *info)
1741 struct drm_fb_helper *fb_helper = info->par;
1742 struct drm_client_dev *client = &fb_helper->client;
1743 struct drm_mode_set *modeset;
1746 mutex_lock(&client->modeset_mutex);
1747 drm_modeset_lock_all(fb_helper->dev);
1748 drm_client_for_each_modeset(modeset, client) {
1749 modeset->x = var->xoffset;
1750 modeset->y = var->yoffset;
1752 if (modeset->num_connectors) {
1753 ret = drm_mode_set_config_internal(modeset);
1755 info->var.xoffset = var->xoffset;
1756 info->var.yoffset = var->yoffset;
1760 drm_modeset_unlock_all(fb_helper->dev);
1761 mutex_unlock(&client->modeset_mutex);
1767 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1768 * @var: updated screen information
1769 * @info: fbdev registered by the helper
1771 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1772 struct fb_info *info)
1774 struct drm_fb_helper *fb_helper = info->par;
1775 struct drm_device *dev = fb_helper->dev;
1778 if (oops_in_progress)
1781 mutex_lock(&fb_helper->lock);
1782 if (!drm_master_internal_acquire(dev)) {
1787 if (drm_drv_uses_atomic_modeset(dev))
1788 ret = pan_display_atomic(var, info);
1790 ret = pan_display_legacy(var, info);
1792 drm_master_internal_release(dev);
1794 mutex_unlock(&fb_helper->lock);
1798 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1800 static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats,
1801 size_t format_count, uint32_t bpp, uint32_t depth)
1803 struct drm_device *dev = fb_helper->dev;
1808 * Do not consider YUV or other complicated formats
1809 * for framebuffers. This means only legacy formats
1810 * are supported (fmt->depth is a legacy field), but
1811 * the framebuffer emulation can only deal with such
1812 * formats, specifically RGB/BGA formats.
1814 format = drm_mode_legacy_fb_format(bpp, depth);
1818 for (i = 0; i < format_count; ++i) {
1819 if (formats[i] == format)
1824 /* We found nothing. */
1825 drm_warn(dev, "bpp/depth value of %u/%u not supported\n", bpp, depth);
1827 return DRM_FORMAT_INVALID;
1830 static uint32_t drm_fb_helper_find_color_mode_format(struct drm_fb_helper *fb_helper,
1831 const uint32_t *formats, size_t format_count,
1832 unsigned int color_mode)
1834 struct drm_device *dev = fb_helper->dev;
1835 uint32_t bpp, depth;
1837 switch (color_mode) {
1844 bpp = depth = color_mode;
1855 drm_info(dev, "unsupported color mode of %d\n", color_mode);
1856 return DRM_FORMAT_INVALID;
1859 return drm_fb_helper_find_format(fb_helper, formats, format_count, bpp, depth);
1862 static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
1863 struct drm_fb_helper_surface_size *sizes)
1865 struct drm_client_dev *client = &fb_helper->client;
1866 struct drm_device *dev = fb_helper->dev;
1868 struct drm_connector_list_iter conn_iter;
1869 struct drm_connector *connector;
1870 struct drm_mode_set *mode_set;
1871 uint32_t surface_format = DRM_FORMAT_INVALID;
1872 const struct drm_format_info *info;
1874 memset(sizes, 0, sizeof(*sizes));
1875 sizes->fb_width = (u32)-1;
1876 sizes->fb_height = (u32)-1;
1878 drm_client_for_each_modeset(mode_set, client) {
1879 struct drm_crtc *crtc = mode_set->crtc;
1880 struct drm_plane *plane = crtc->primary;
1882 drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
1884 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1885 drm_client_for_each_connector_iter(connector, &conn_iter) {
1886 struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
1888 if (!cmdline_mode->bpp_specified)
1891 surface_format = drm_fb_helper_find_color_mode_format(fb_helper,
1892 plane->format_types,
1893 plane->format_count,
1895 if (surface_format != DRM_FORMAT_INVALID)
1896 break; /* found supported format */
1898 drm_connector_list_iter_end(&conn_iter);
1900 if (surface_format != DRM_FORMAT_INVALID)
1901 break; /* found supported format */
1903 /* try preferred color mode */
1904 surface_format = drm_fb_helper_find_color_mode_format(fb_helper,
1905 plane->format_types,
1906 plane->format_count,
1907 fb_helper->preferred_bpp);
1908 if (surface_format != DRM_FORMAT_INVALID)
1909 break; /* found supported format */
1912 if (surface_format == DRM_FORMAT_INVALID) {
1914 * If none of the given color modes works, fall back
1915 * to XRGB8888. Drivers are expected to provide this
1916 * format for compatibility with legacy applications.
1918 drm_warn(dev, "No compatible format found\n");
1919 surface_format = drm_driver_legacy_fb_format(dev, 32, 24);
1922 info = drm_format_info(surface_format);
1923 sizes->surface_bpp = drm_format_info_bpp(info, 0);
1924 sizes->surface_depth = info->depth;
1926 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1928 drm_client_for_each_modeset(mode_set, client) {
1929 struct drm_display_mode *desired_mode;
1931 /* in case of tile group, are we the last tile vert or horiz?
1932 * If no tile group you are always the last one both vertically
1935 bool lastv = true, lasth = true;
1937 desired_mode = mode_set->mode;
1947 sizes->surface_width =
1948 max_t(u32, desired_mode->hdisplay + x, sizes->surface_width);
1949 sizes->surface_height =
1950 max_t(u32, desired_mode->vdisplay + y, sizes->surface_height);
1952 for (j = 0; j < mode_set->num_connectors; j++) {
1953 struct drm_connector *connector = mode_set->connectors[j];
1955 if (connector->has_tile &&
1956 desired_mode->hdisplay == connector->tile_h_size &&
1957 desired_mode->vdisplay == connector->tile_v_size) {
1958 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1959 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1960 /* cloning to multiple tiles is just crazy-talk, so: */
1966 sizes->fb_width = min_t(u32, desired_mode->hdisplay + x, sizes->fb_width);
1968 sizes->fb_height = min_t(u32, desired_mode->vdisplay + y, sizes->fb_height);
1971 if (crtc_count == 0 || sizes->fb_width == -1 || sizes->fb_height == -1) {
1972 drm_info(dev, "Cannot find any crtc or sizes\n");
1979 static int drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
1980 struct drm_fb_helper_surface_size *sizes)
1982 struct drm_client_dev *client = &fb_helper->client;
1983 struct drm_device *dev = fb_helper->dev;
1984 struct drm_mode_config *config = &dev->mode_config;
1987 mutex_lock(&client->modeset_mutex);
1988 ret = __drm_fb_helper_find_sizes(fb_helper, sizes);
1989 mutex_unlock(&client->modeset_mutex);
1994 /* Handle our overallocation */
1995 sizes->surface_height *= drm_fbdev_overalloc;
1996 sizes->surface_height /= 100;
1997 if (sizes->surface_height > config->max_height) {
1998 drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
1999 config->max_height);
2000 sizes->surface_height = config->max_height;
2007 * Allocates the backing storage and sets up the fbdev info structure through
2008 * the ->fb_probe callback.
2010 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
2012 struct drm_client_dev *client = &fb_helper->client;
2013 struct drm_device *dev = fb_helper->dev;
2014 struct drm_fb_helper_surface_size sizes;
2017 ret = drm_fb_helper_find_sizes(fb_helper, &sizes);
2019 /* First time: disable all crtc's.. */
2020 if (!fb_helper->deferred_setup)
2021 drm_client_modeset_commit(client);
2025 /* push down into drivers */
2026 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
2030 strcpy(fb_helper->fb->comm, "[fbcon]");
2032 /* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
2033 if (dev_is_pci(dev->dev))
2034 vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
2039 static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
2040 bool is_color_indexed)
2042 info->fix.type = FB_TYPE_PACKED_PIXELS;
2043 info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
2044 : FB_VISUAL_TRUECOLOR;
2045 info->fix.mmio_start = 0;
2046 info->fix.mmio_len = 0;
2047 info->fix.type_aux = 0;
2048 info->fix.xpanstep = 1; /* doing it in hw */
2049 info->fix.ypanstep = 1; /* doing it in hw */
2050 info->fix.ywrapstep = 0;
2051 info->fix.accel = FB_ACCEL_NONE;
2053 info->fix.line_length = pitch;
2056 static void drm_fb_helper_fill_var(struct fb_info *info,
2057 struct drm_fb_helper *fb_helper,
2058 uint32_t fb_width, uint32_t fb_height)
2060 struct drm_framebuffer *fb = fb_helper->fb;
2061 const struct drm_format_info *format = fb->format;
2063 switch (format->format) {
2067 /* supported format with sub-byte pixels */
2071 WARN_ON((drm_format_info_block_width(format, 0) > 1) ||
2072 (drm_format_info_block_height(format, 0) > 1));
2076 info->pseudo_palette = fb_helper->pseudo_palette;
2077 info->var.xoffset = 0;
2078 info->var.yoffset = 0;
2079 __fill_var(&info->var, info, fb);
2080 info->var.activate = FB_ACTIVATE_NOW;
2082 drm_fb_helper_fill_pixel_fmt(&info->var, format);
2084 info->var.xres = fb_width;
2085 info->var.yres = fb_height;
2089 * drm_fb_helper_fill_info - initializes fbdev information
2090 * @info: fbdev instance to set up
2091 * @fb_helper: fb helper instance to use as template
2092 * @sizes: describes fbdev size and scanout surface size
2094 * Sets up the variable and fixed fbdev metainformation from the given fb helper
2095 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
2097 * Drivers should call this (or their equivalent setup code) from their
2098 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
2099 * backing storage framebuffer.
2101 void drm_fb_helper_fill_info(struct fb_info *info,
2102 struct drm_fb_helper *fb_helper,
2103 struct drm_fb_helper_surface_size *sizes)
2105 struct drm_framebuffer *fb = fb_helper->fb;
2107 drm_fb_helper_fill_fix(info, fb->pitches[0],
2108 fb->format->is_color_indexed);
2109 drm_fb_helper_fill_var(info, fb_helper,
2110 sizes->fb_width, sizes->fb_height);
2112 info->par = fb_helper;
2114 * The DRM drivers fbdev emulation device name can be confusing if the
2115 * driver name also has a "drm" suffix on it. Leading to names such as
2116 * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't
2117 * be changed due user-space tools (e.g: pm-utils) matching against it.
2119 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
2120 fb_helper->dev->driver->name);
2123 EXPORT_SYMBOL(drm_fb_helper_fill_info);
2126 * This is a continuation of drm_setup_crtcs() that sets up anything related
2127 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
2128 * the framebuffer has been allocated (fb_helper->fb and fb_helper->info).
2129 * So, any setup that touches those fields needs to be done here instead of in
2130 * drm_setup_crtcs().
2132 static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
2134 struct drm_client_dev *client = &fb_helper->client;
2135 struct drm_connector_list_iter conn_iter;
2136 struct fb_info *info = fb_helper->info;
2137 unsigned int rotation, sw_rotations = 0;
2138 struct drm_connector *connector;
2139 struct drm_mode_set *modeset;
2141 mutex_lock(&client->modeset_mutex);
2142 drm_client_for_each_modeset(modeset, client) {
2143 if (!modeset->num_connectors)
2146 modeset->fb = fb_helper->fb;
2148 if (drm_client_rotation(modeset, &rotation))
2149 /* Rotating in hardware, fbcon should not rotate */
2150 sw_rotations |= DRM_MODE_ROTATE_0;
2152 sw_rotations |= rotation;
2154 mutex_unlock(&client->modeset_mutex);
2156 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
2157 drm_client_for_each_connector_iter(connector, &conn_iter) {
2159 /* use first connected connector for the physical dimensions */
2160 if (connector->status == connector_status_connected) {
2161 info->var.width = connector->display_info.width_mm;
2162 info->var.height = connector->display_info.height_mm;
2166 drm_connector_list_iter_end(&conn_iter);
2168 switch (sw_rotations) {
2169 case DRM_MODE_ROTATE_0:
2170 info->fbcon_rotate_hint = FB_ROTATE_UR;
2172 case DRM_MODE_ROTATE_90:
2173 info->fbcon_rotate_hint = FB_ROTATE_CCW;
2175 case DRM_MODE_ROTATE_180:
2176 info->fbcon_rotate_hint = FB_ROTATE_UD;
2178 case DRM_MODE_ROTATE_270:
2179 info->fbcon_rotate_hint = FB_ROTATE_CW;
2183 * Multiple bits are set / multiple rotations requested
2184 * fbcon cannot handle separate rotation settings per
2185 * output, so fallback to unrotated.
2187 info->fbcon_rotate_hint = FB_ROTATE_UR;
2191 /* Note: Drops fb_helper->lock before returning. */
2193 __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
2195 struct drm_device *dev = fb_helper->dev;
2196 struct fb_info *info;
2197 unsigned int width, height;
2200 width = dev->mode_config.max_width;
2201 height = dev->mode_config.max_height;
2203 drm_client_modeset_probe(&fb_helper->client, width, height);
2204 ret = drm_fb_helper_single_fb_probe(fb_helper);
2206 if (ret == -EAGAIN) {
2207 fb_helper->deferred_setup = true;
2210 mutex_unlock(&fb_helper->lock);
2214 drm_setup_crtcs_fb(fb_helper);
2216 fb_helper->deferred_setup = false;
2218 info = fb_helper->info;
2219 info->var.pixclock = 0;
2221 if (!drm_leak_fbdev_smem)
2222 info->flags |= FBINFO_HIDE_SMEM_START;
2224 /* Need to drop locks to avoid recursive deadlock in
2225 * register_framebuffer. This is ok because the only thing left to do is
2226 * register the fbdev emulation instance in kernel_fb_helper_list. */
2227 mutex_unlock(&fb_helper->lock);
2229 ret = register_framebuffer(info);
2233 drm_info(dev, "fb%d: %s frame buffer device\n",
2234 info->node, info->fix.id);
2236 mutex_lock(&kernel_fb_helper_lock);
2237 if (list_empty(&kernel_fb_helper_list))
2238 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
2240 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
2241 mutex_unlock(&kernel_fb_helper_lock);
2247 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2248 * @fb_helper: fb_helper device struct
2250 * Scans the CRTCs and connectors and tries to put together an initial setup.
2251 * At the moment, this is a cloned configuration across all heads with
2252 * a new framebuffer object as the backing store.
2254 * Note that this also registers the fbdev and so allows userspace to call into
2255 * the driver through the fbdev interfaces.
2257 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2258 * to let the driver allocate and initialize the fbdev info structure and the
2259 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
2260 * as a helper to setup simple default values for the fbdev info structure.
2264 * When you have fbcon support built-in or already loaded, this function will do
2265 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2266 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2267 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2268 * to consoles, not even serial console. This means when your driver crashes,
2269 * you will see absolutely nothing else but a system stuck in this function,
2270 * with no further output. Any kind of printk() you place within your own driver
2271 * or in the drm core modeset code will also never show up.
2273 * Standard debug practice is to run the fbcon setup without taking the
2274 * console_lock as a hack, to be able to see backtraces and crashes on the
2275 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2278 * The other option is to just disable fbdev emulation since very likely the
2279 * first modeset from userspace will crash in the same way, and is even easier
2280 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2281 * kernel cmdline option.
2284 * Zero if everything went ok, nonzero otherwise.
2286 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper)
2290 if (!drm_fbdev_emulation)
2293 mutex_lock(&fb_helper->lock);
2294 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper);
2298 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2301 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2302 * probing all the outputs attached to the fb
2303 * @fb_helper: driver-allocated fbdev helper, can be NULL
2305 * Scan the connectors attached to the fb_helper and try to put together a
2306 * setup after notification of a change in output configuration.
2308 * Called at runtime, takes the mode config locks to be able to check/change the
2309 * modeset configuration. Must be run from process context (which usually means
2310 * either the output polling work or a work item launched from the driver's
2311 * hotplug interrupt).
2313 * Note that drivers may call this even before calling
2314 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2315 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2316 * not miss any hotplug events.
2319 * 0 on success and a non-zero error code otherwise.
2321 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2325 if (!drm_fbdev_emulation || !fb_helper)
2328 mutex_lock(&fb_helper->lock);
2329 if (fb_helper->deferred_setup) {
2330 err = __drm_fb_helper_initial_config_and_unlock(fb_helper);
2334 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
2335 fb_helper->delayed_hotplug = true;
2336 mutex_unlock(&fb_helper->lock);
2340 drm_master_internal_release(fb_helper->dev);
2342 drm_dbg_kms(fb_helper->dev, "\n");
2344 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
2345 drm_setup_crtcs_fb(fb_helper);
2346 mutex_unlock(&fb_helper->lock);
2348 drm_fb_helper_set_par(fb_helper->info);
2352 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2355 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
2358 * This function can be used as the &drm_driver->lastclose callback for drivers
2359 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
2361 void drm_fb_helper_lastclose(struct drm_device *dev)
2363 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
2365 EXPORT_SYMBOL(drm_fb_helper_lastclose);
2368 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
2369 * helper for fbdev emulation
2372 * This function can be used as the
2373 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only
2374 * need to call drm_fbdev.hotplug_event().
2376 void drm_fb_helper_output_poll_changed(struct drm_device *dev)
2378 drm_fb_helper_hotplug_event(dev->fb_helper);
2380 EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);