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/kernel.h>
34 #include <linux/sysrq.h>
35 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
41 #include <drm/drm_atomic.h>
42 #include <drm/drm_atomic_helper.h>
44 #include "drm_crtc_helper_internal.h"
46 static bool drm_fbdev_emulation = true;
47 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
48 MODULE_PARM_DESC(fbdev_emulation,
49 "Enable legacy fbdev emulation [default=true]");
51 static LIST_HEAD(kernel_fb_helper_list);
56 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
57 * mode setting driver. They can be used mostly independently from the crtc
58 * helper functions used by many drivers to implement the kernel mode setting
61 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
62 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
63 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
64 * default behaviour can override the third step with their own code.
65 * Teardown is done with drm_fb_helper_fini().
67 * At runtime drivers should restore the fbdev console by calling
68 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
69 * They should also notify the fb helper code from updates to the output
70 * configuration by calling drm_fb_helper_hotplug_event(). For easier
71 * integration with the output polling code in drm_crtc_helper.c the modeset
72 * code provides a ->output_poll_changed callback.
74 * All other functions exported by the fb helper library can be used to
75 * implement the fbdev driver interface by the driver.
77 * It is possible, though perhaps somewhat tricky, to implement race-free
78 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
79 * helper must be called first to initialize the minimum required to make
80 * hotplug detection work. Drivers also need to make sure to properly set up
81 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
82 * it is safe to enable interrupts and start processing hotplug events. At the
83 * same time, drivers should initialize all modeset objects such as CRTCs,
84 * encoders and connectors. To finish up the fbdev helper initialization, the
85 * drm_fb_helper_init() function is called. To probe for all attached displays
86 * and set up an initial configuration using the detected hardware, drivers
87 * should call drm_fb_helper_single_add_all_connectors() followed by
88 * drm_fb_helper_initial_config().
90 * If &drm_framebuffer_funcs ->dirty is set, the
91 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
92 * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
93 * away. This worker then calls the dirty() function ensuring that it will
94 * always run in process context since the fb_*() function could be running in
95 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
96 * callback it will also schedule dirty_work with the damage collected from the
101 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
103 * @fb_helper: fbdev initialized with drm_fb_helper_init
105 * This functions adds all the available connectors for use with the given
106 * fb_helper. This is a separate step to allow drivers to freely assign
107 * connectors to the fbdev, e.g. if some are reserved for special purposes or
108 * not adequate to be used for the fbcon.
110 * This function is protected against concurrent connector hotadds/removals
111 * using drm_fb_helper_add_one_connector() and
112 * drm_fb_helper_remove_one_connector().
114 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
116 struct drm_device *dev = fb_helper->dev;
117 struct drm_connector *connector;
120 if (!drm_fbdev_emulation)
123 mutex_lock(&dev->mode_config.mutex);
124 drm_for_each_connector(connector, dev) {
125 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
130 mutex_unlock(&dev->mode_config.mutex);
133 for (i = 0; i < fb_helper->connector_count; i++) {
134 struct drm_fb_helper_connector *fb_helper_connector =
135 fb_helper->connector_info[i];
137 drm_connector_unreference(fb_helper_connector->connector);
139 kfree(fb_helper_connector);
140 fb_helper->connector_info[i] = NULL;
142 fb_helper->connector_count = 0;
143 mutex_unlock(&dev->mode_config.mutex);
147 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
149 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
151 struct drm_fb_helper_connector **temp;
152 struct drm_fb_helper_connector *fb_helper_connector;
154 if (!drm_fbdev_emulation)
157 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
158 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
159 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
163 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
164 fb_helper->connector_info = temp;
168 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
169 if (!fb_helper_connector)
172 drm_connector_reference(connector);
173 fb_helper_connector->connector = connector;
174 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
177 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
179 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
180 struct drm_connector *connector)
182 struct drm_fb_helper_connector *fb_helper_connector;
185 if (!drm_fbdev_emulation)
188 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
190 for (i = 0; i < fb_helper->connector_count; i++) {
191 if (fb_helper->connector_info[i]->connector == connector)
195 if (i == fb_helper->connector_count)
197 fb_helper_connector = fb_helper->connector_info[i];
198 drm_connector_unreference(fb_helper_connector->connector);
200 for (j = i + 1; j < fb_helper->connector_count; j++) {
201 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
203 fb_helper->connector_count--;
204 kfree(fb_helper_connector);
208 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
210 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
212 uint16_t *r_base, *g_base, *b_base;
215 if (helper->funcs->gamma_get == NULL)
218 r_base = crtc->gamma_store;
219 g_base = r_base + crtc->gamma_size;
220 b_base = g_base + crtc->gamma_size;
222 for (i = 0; i < crtc->gamma_size; i++)
223 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
226 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
228 uint16_t *r_base, *g_base, *b_base;
230 if (crtc->funcs->gamma_set == NULL)
233 r_base = crtc->gamma_store;
234 g_base = r_base + crtc->gamma_size;
235 b_base = g_base + crtc->gamma_size;
237 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
241 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
242 * @info: fbdev registered by the helper
244 int drm_fb_helper_debug_enter(struct fb_info *info)
246 struct drm_fb_helper *helper = info->par;
247 const struct drm_crtc_helper_funcs *funcs;
250 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
251 for (i = 0; i < helper->crtc_count; i++) {
252 struct drm_mode_set *mode_set =
253 &helper->crtc_info[i].mode_set;
255 if (!mode_set->crtc->enabled)
258 funcs = mode_set->crtc->helper_private;
259 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
260 funcs->mode_set_base_atomic(mode_set->crtc,
264 ENTER_ATOMIC_MODE_SET);
270 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
272 /* Find the real fb for a given fb helper CRTC */
273 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
275 struct drm_device *dev = crtc->dev;
278 drm_for_each_crtc(c, dev) {
279 if (crtc->base.id == c->base.id)
280 return c->primary->fb;
287 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
288 * @info: fbdev registered by the helper
290 int drm_fb_helper_debug_leave(struct fb_info *info)
292 struct drm_fb_helper *helper = info->par;
293 struct drm_crtc *crtc;
294 const struct drm_crtc_helper_funcs *funcs;
295 struct drm_framebuffer *fb;
298 for (i = 0; i < helper->crtc_count; i++) {
299 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
300 crtc = mode_set->crtc;
301 funcs = crtc->helper_private;
302 fb = drm_mode_config_fb(crtc);
308 DRM_ERROR("no fb to restore??\n");
312 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
313 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
314 crtc->y, LEAVE_ATOMIC_MODE_SET);
319 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
321 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
323 struct drm_device *dev = fb_helper->dev;
324 struct drm_plane *plane;
325 struct drm_atomic_state *state;
329 state = drm_atomic_state_alloc(dev);
333 state->acquire_ctx = dev->mode_config.acquire_ctx;
336 drm_for_each_plane(plane, dev) {
337 struct drm_plane_state *plane_state;
339 plane_state = drm_atomic_get_plane_state(state, plane);
340 if (IS_ERR(plane_state)) {
341 ret = PTR_ERR(plane_state);
345 plane_state->rotation = DRM_ROTATE_0;
347 plane->old_fb = plane->fb;
348 plane_mask |= 1 << drm_plane_index(plane);
350 /* disable non-primary: */
351 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
354 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
359 for(i = 0; i < fb_helper->crtc_count; i++) {
360 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
362 ret = __drm_atomic_helper_set_config(mode_set, state);
367 ret = drm_atomic_commit(state);
370 drm_atomic_clean_old_fb(dev, plane_mask, ret);
376 drm_atomic_state_free(state);
381 drm_atomic_state_clear(state);
382 drm_atomic_legacy_backoff(state);
387 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
389 struct drm_device *dev = fb_helper->dev;
390 struct drm_plane *plane;
393 drm_warn_on_modeset_not_all_locked(dev);
395 if (dev->mode_config.funcs->atomic_commit)
396 return restore_fbdev_mode_atomic(fb_helper);
398 drm_for_each_plane(plane, dev) {
399 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
400 drm_plane_force_disable(plane);
402 if (dev->mode_config.rotation_property) {
403 drm_mode_plane_set_obj_prop(plane,
404 dev->mode_config.rotation_property,
409 for (i = 0; i < fb_helper->crtc_count; i++) {
410 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
411 struct drm_crtc *crtc = mode_set->crtc;
414 if (crtc->funcs->cursor_set2) {
415 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
418 } else if (crtc->funcs->cursor_set) {
419 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
424 ret = drm_mode_set_config_internal(mode_set);
433 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
434 * @fb_helper: fbcon to restore
436 * This should be called from driver's drm ->lastclose callback
437 * when implementing an fbcon on top of kms using this helper. This ensures that
438 * the user isn't greeted with a black screen when e.g. X dies.
441 * Zero if everything went ok, negative error code otherwise.
443 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
445 struct drm_device *dev = fb_helper->dev;
449 if (!drm_fbdev_emulation)
452 drm_modeset_lock_all(dev);
453 ret = restore_fbdev_mode(fb_helper);
455 do_delayed = fb_helper->delayed_hotplug;
457 fb_helper->delayed_hotplug = false;
458 drm_modeset_unlock_all(dev);
461 drm_fb_helper_hotplug_event(fb_helper);
464 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
466 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
468 struct drm_device *dev = fb_helper->dev;
469 struct drm_crtc *crtc;
470 int bound = 0, crtcs_bound = 0;
472 /* Sometimes user space wants everything disabled, so don't steal the
473 * display if there's a master. */
474 if (READ_ONCE(dev->master))
477 drm_for_each_crtc(crtc, dev) {
478 if (crtc->primary->fb)
480 if (crtc->primary->fb == fb_helper->fb)
484 if (bound < crtcs_bound)
490 #ifdef CONFIG_MAGIC_SYSRQ
492 * restore fbcon display for all kms driver's using this helper, used for sysrq
493 * and panic handling.
495 static bool drm_fb_helper_force_kernel_mode(void)
497 bool ret, error = false;
498 struct drm_fb_helper *helper;
500 if (list_empty(&kernel_fb_helper_list))
503 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
504 struct drm_device *dev = helper->dev;
506 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
509 drm_modeset_lock_all(dev);
510 ret = restore_fbdev_mode(helper);
513 drm_modeset_unlock_all(dev);
518 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
521 ret = drm_fb_helper_force_kernel_mode();
523 DRM_ERROR("Failed to restore crtc configuration\n");
525 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
527 static void drm_fb_helper_sysrq(int dummy1)
529 schedule_work(&drm_fb_helper_restore_work);
532 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
533 .handler = drm_fb_helper_sysrq,
534 .help_msg = "force-fb(V)",
535 .action_msg = "Restore framebuffer console",
538 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
541 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
543 struct drm_fb_helper *fb_helper = info->par;
544 struct drm_device *dev = fb_helper->dev;
545 struct drm_crtc *crtc;
546 struct drm_connector *connector;
550 * For each CRTC in this fb, turn the connectors on/off.
552 drm_modeset_lock_all(dev);
553 if (!drm_fb_helper_is_bound(fb_helper)) {
554 drm_modeset_unlock_all(dev);
558 for (i = 0; i < fb_helper->crtc_count; i++) {
559 crtc = fb_helper->crtc_info[i].mode_set.crtc;
564 /* Walk the connectors & encoders on this fb turning them on/off */
565 for (j = 0; j < fb_helper->connector_count; j++) {
566 connector = fb_helper->connector_info[j]->connector;
567 connector->funcs->dpms(connector, dpms_mode);
568 drm_object_property_set_value(&connector->base,
569 dev->mode_config.dpms_property, dpms_mode);
572 drm_modeset_unlock_all(dev);
576 * drm_fb_helper_blank - implementation for ->fb_blank
577 * @blank: desired blanking state
578 * @info: fbdev registered by the helper
580 int drm_fb_helper_blank(int blank, struct fb_info *info)
582 if (oops_in_progress)
586 /* Display: On; HSync: On, VSync: On */
587 case FB_BLANK_UNBLANK:
588 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
590 /* Display: Off; HSync: On, VSync: On */
591 case FB_BLANK_NORMAL:
592 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
594 /* Display: Off; HSync: Off, VSync: On */
595 case FB_BLANK_HSYNC_SUSPEND:
596 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
598 /* Display: Off; HSync: On, VSync: Off */
599 case FB_BLANK_VSYNC_SUSPEND:
600 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
602 /* Display: Off; HSync: Off, VSync: Off */
603 case FB_BLANK_POWERDOWN:
604 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
609 EXPORT_SYMBOL(drm_fb_helper_blank);
611 static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper,
612 struct drm_mode_set *modeset)
616 for (i = 0; i < modeset->num_connectors; i++) {
617 drm_connector_unreference(modeset->connectors[i]);
618 modeset->connectors[i] = NULL;
620 modeset->num_connectors = 0;
622 drm_mode_destroy(helper->dev, modeset->mode);
623 modeset->mode = NULL;
625 /* FIXME should hold a ref? */
629 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
633 for (i = 0; i < helper->connector_count; i++) {
634 drm_connector_unreference(helper->connector_info[i]->connector);
635 kfree(helper->connector_info[i]);
637 kfree(helper->connector_info);
639 for (i = 0; i < helper->crtc_count; i++) {
640 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set;
642 drm_fb_helper_modeset_release(helper, modeset);
643 kfree(modeset->connectors);
645 kfree(helper->crtc_info);
648 static void drm_fb_helper_resume_worker(struct work_struct *work)
650 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
654 fb_set_suspend(helper->fbdev, 0);
658 static void drm_fb_helper_dirty_work(struct work_struct *work)
660 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
662 struct drm_clip_rect *clip = &helper->dirty_clip;
663 struct drm_clip_rect clip_copy;
666 spin_lock_irqsave(&helper->dirty_lock, flags);
668 clip->x1 = clip->y1 = ~0;
669 clip->x2 = clip->y2 = 0;
670 spin_unlock_irqrestore(&helper->dirty_lock, flags);
672 /* call dirty callback only when it has been really touched */
673 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)
674 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
678 * drm_fb_helper_prepare - setup a drm_fb_helper structure
680 * @helper: driver-allocated fbdev helper structure to set up
681 * @funcs: pointer to structure of functions associate with this helper
683 * Sets up the bare minimum to make the framebuffer helper usable. This is
684 * useful to implement race-free initialization of the polling helpers.
686 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
687 const struct drm_fb_helper_funcs *funcs)
689 INIT_LIST_HEAD(&helper->kernel_fb_list);
690 spin_lock_init(&helper->dirty_lock);
691 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
692 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
693 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
694 helper->funcs = funcs;
697 EXPORT_SYMBOL(drm_fb_helper_prepare);
700 * drm_fb_helper_init - initialize a drm_fb_helper structure
702 * @fb_helper: driver-allocated fbdev helper structure to initialize
703 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
704 * @max_conn_count: max connector count
706 * This allocates the structures for the fbdev helper with the given limits.
707 * Note that this won't yet touch the hardware (through the driver interfaces)
708 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
709 * to allow driver writes more control over the exact init sequence.
711 * Drivers must call drm_fb_helper_prepare() before calling this function.
714 * Zero if everything went ok, nonzero otherwise.
716 int drm_fb_helper_init(struct drm_device *dev,
717 struct drm_fb_helper *fb_helper,
718 int crtc_count, int max_conn_count)
720 struct drm_crtc *crtc;
723 if (!drm_fbdev_emulation)
729 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
730 if (!fb_helper->crtc_info)
733 fb_helper->crtc_count = crtc_count;
734 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
735 if (!fb_helper->connector_info) {
736 kfree(fb_helper->crtc_info);
739 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
740 fb_helper->connector_count = 0;
742 for (i = 0; i < crtc_count; i++) {
743 fb_helper->crtc_info[i].mode_set.connectors =
744 kcalloc(max_conn_count,
745 sizeof(struct drm_connector *),
748 if (!fb_helper->crtc_info[i].mode_set.connectors)
750 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
754 drm_for_each_crtc(crtc, dev) {
755 fb_helper->crtc_info[i].mode_set.crtc = crtc;
761 drm_fb_helper_crtc_free(fb_helper);
764 EXPORT_SYMBOL(drm_fb_helper_init);
767 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
768 * @fb_helper: driver-allocated fbdev helper
770 * A helper to alloc fb_info and the members cmap and apertures. Called
771 * by the driver within the fb_probe fb_helper callback function.
774 * fb_info pointer if things went okay, pointer containing error code
777 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
779 struct device *dev = fb_helper->dev->dev;
780 struct fb_info *info;
783 info = framebuffer_alloc(0, dev);
785 return ERR_PTR(-ENOMEM);
787 ret = fb_alloc_cmap(&info->cmap, 256, 0);
791 info->apertures = alloc_apertures(1);
792 if (!info->apertures) {
797 fb_helper->fbdev = info;
802 fb_dealloc_cmap(&info->cmap);
804 framebuffer_release(info);
807 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
810 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
811 * @fb_helper: driver-allocated fbdev helper
813 * A wrapper around unregister_framebuffer, to release the fb_info
816 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
818 if (fb_helper && fb_helper->fbdev)
819 unregister_framebuffer(fb_helper->fbdev);
821 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
824 * drm_fb_helper_release_fbi - dealloc fb_info and its members
825 * @fb_helper: driver-allocated fbdev helper
827 * A helper to free memory taken by fb_info and the members cmap and
830 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
833 struct fb_info *info = fb_helper->fbdev;
837 fb_dealloc_cmap(&info->cmap);
838 framebuffer_release(info);
841 fb_helper->fbdev = NULL;
844 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
846 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
848 if (!drm_fbdev_emulation)
851 cancel_work_sync(&fb_helper->resume_work);
852 cancel_work_sync(&fb_helper->dirty_work);
854 if (!list_empty(&fb_helper->kernel_fb_list)) {
855 list_del(&fb_helper->kernel_fb_list);
856 if (list_empty(&kernel_fb_helper_list)) {
857 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
861 drm_fb_helper_crtc_free(fb_helper);
864 EXPORT_SYMBOL(drm_fb_helper_fini);
867 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
868 * @fb_helper: driver-allocated fbdev helper
870 * A wrapper around unlink_framebuffer implemented by fbdev core
872 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
874 if (fb_helper && fb_helper->fbdev)
875 unlink_framebuffer(fb_helper->fbdev);
877 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
879 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
880 u32 width, u32 height)
882 struct drm_fb_helper *helper = info->par;
883 struct drm_clip_rect *clip = &helper->dirty_clip;
886 if (!helper->fb->funcs->dirty)
889 spin_lock_irqsave(&helper->dirty_lock, flags);
890 clip->x1 = min_t(u32, clip->x1, x);
891 clip->y1 = min_t(u32, clip->y1, y);
892 clip->x2 = max_t(u32, clip->x2, x + width);
893 clip->y2 = max_t(u32, clip->y2, y + height);
894 spin_unlock_irqrestore(&helper->dirty_lock, flags);
896 schedule_work(&helper->dirty_work);
900 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
901 * @info: fb_info struct pointer
902 * @pagelist: list of dirty mmap framebuffer pages
904 * This function is used as the &fb_deferred_io ->deferred_io
905 * callback function for flushing the fbdev mmap writes.
907 void drm_fb_helper_deferred_io(struct fb_info *info,
908 struct list_head *pagelist)
910 unsigned long start, end, min, max;
916 list_for_each_entry(page, pagelist, lru) {
917 start = page->index << PAGE_SHIFT;
918 end = start + PAGE_SIZE - 1;
919 min = min(min, start);
924 y1 = min / info->fix.line_length;
925 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
927 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
930 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
933 * drm_fb_helper_sys_read - wrapper around fb_sys_read
934 * @info: fb_info struct pointer
935 * @buf: userspace buffer to read from framebuffer memory
936 * @count: number of bytes to read from framebuffer memory
937 * @ppos: read offset within framebuffer memory
939 * A wrapper around fb_sys_read implemented by fbdev core
941 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
942 size_t count, loff_t *ppos)
944 return fb_sys_read(info, buf, count, ppos);
946 EXPORT_SYMBOL(drm_fb_helper_sys_read);
949 * drm_fb_helper_sys_write - wrapper around fb_sys_write
950 * @info: fb_info struct pointer
951 * @buf: userspace buffer to write to framebuffer memory
952 * @count: number of bytes to write to framebuffer memory
953 * @ppos: write offset within framebuffer memory
955 * A wrapper around fb_sys_write implemented by fbdev core
957 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
958 size_t count, loff_t *ppos)
962 ret = fb_sys_write(info, buf, count, ppos);
964 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
969 EXPORT_SYMBOL(drm_fb_helper_sys_write);
972 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
973 * @info: fbdev registered by the helper
974 * @rect: info about rectangle to fill
976 * A wrapper around sys_fillrect implemented by fbdev core
978 void drm_fb_helper_sys_fillrect(struct fb_info *info,
979 const struct fb_fillrect *rect)
981 sys_fillrect(info, rect);
982 drm_fb_helper_dirty(info, rect->dx, rect->dy,
983 rect->width, rect->height);
985 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
988 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
989 * @info: fbdev registered by the helper
990 * @area: info about area to copy
992 * A wrapper around sys_copyarea implemented by fbdev core
994 void drm_fb_helper_sys_copyarea(struct fb_info *info,
995 const struct fb_copyarea *area)
997 sys_copyarea(info, area);
998 drm_fb_helper_dirty(info, area->dx, area->dy,
999 area->width, area->height);
1001 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
1004 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1005 * @info: fbdev registered by the helper
1006 * @image: info about image to blit
1008 * A wrapper around sys_imageblit implemented by fbdev core
1010 void drm_fb_helper_sys_imageblit(struct fb_info *info,
1011 const struct fb_image *image)
1013 sys_imageblit(info, image);
1014 drm_fb_helper_dirty(info, image->dx, image->dy,
1015 image->width, image->height);
1017 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
1020 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1021 * @info: fbdev registered by the helper
1022 * @rect: info about rectangle to fill
1024 * A wrapper around cfb_imageblit implemented by fbdev core
1026 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1027 const struct fb_fillrect *rect)
1029 cfb_fillrect(info, rect);
1030 drm_fb_helper_dirty(info, rect->dx, rect->dy,
1031 rect->width, rect->height);
1033 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1036 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1037 * @info: fbdev registered by the helper
1038 * @area: info about area to copy
1040 * A wrapper around cfb_copyarea implemented by fbdev core
1042 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1043 const struct fb_copyarea *area)
1045 cfb_copyarea(info, area);
1046 drm_fb_helper_dirty(info, area->dx, area->dy,
1047 area->width, area->height);
1049 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1052 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1053 * @info: fbdev registered by the helper
1054 * @image: info about image to blit
1056 * A wrapper around cfb_imageblit implemented by fbdev core
1058 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1059 const struct fb_image *image)
1061 cfb_imageblit(info, image);
1062 drm_fb_helper_dirty(info, image->dx, image->dy,
1063 image->width, image->height);
1065 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1068 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1069 * @fb_helper: driver-allocated fbdev helper
1070 * @suspend: whether to suspend or resume
1072 * A wrapper around fb_set_suspend implemented by fbdev core.
1073 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1076 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1078 if (fb_helper && fb_helper->fbdev)
1079 fb_set_suspend(fb_helper->fbdev, suspend);
1081 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1084 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1085 * takes the console lock
1086 * @fb_helper: driver-allocated fbdev helper
1087 * @suspend: whether to suspend or resume
1089 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1090 * isn't available on resume, a worker is tasked with waiting for the lock
1091 * to become available. The console lock can be pretty contented on resume
1092 * due to all the printk activity.
1094 * This function can be called multiple times with the same state since
1095 * &fb_info->state is checked to see if fbdev is running or not before locking.
1097 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1099 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1102 if (!fb_helper || !fb_helper->fbdev)
1105 /* make sure there's no pending/ongoing resume */
1106 flush_work(&fb_helper->resume_work);
1109 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
1115 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
1118 if (!console_trylock()) {
1119 schedule_work(&fb_helper->resume_work);
1124 fb_set_suspend(fb_helper->fbdev, suspend);
1127 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1129 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1130 u16 blue, u16 regno, struct fb_info *info)
1132 struct drm_fb_helper *fb_helper = info->par;
1133 struct drm_framebuffer *fb = fb_helper->fb;
1135 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1138 /* place color in psuedopalette */
1141 palette = (u32 *)info->pseudo_palette;
1142 red >>= (16 - info->var.red.length);
1143 green >>= (16 - info->var.green.length);
1144 blue >>= (16 - info->var.blue.length);
1145 value = (red << info->var.red.offset) |
1146 (green << info->var.green.offset) |
1147 (blue << info->var.blue.offset);
1148 if (info->var.transp.length > 0) {
1149 u32 mask = (1 << info->var.transp.length) - 1;
1150 mask <<= info->var.transp.offset;
1153 palette[regno] = value;
1158 * The driver really shouldn't advertise pseudo/directcolor
1159 * visuals if it can't deal with the palette.
1161 if (WARN_ON(!fb_helper->funcs->gamma_set ||
1162 !fb_helper->funcs->gamma_get))
1165 WARN_ON(fb->bits_per_pixel != 8);
1167 fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1173 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1174 * @cmap: cmap to set
1175 * @info: fbdev registered by the helper
1177 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1179 struct drm_fb_helper *fb_helper = info->par;
1180 struct drm_device *dev = fb_helper->dev;
1181 const struct drm_crtc_helper_funcs *crtc_funcs;
1182 u16 *red, *green, *blue, *transp;
1183 struct drm_crtc *crtc;
1187 if (oops_in_progress)
1190 drm_modeset_lock_all(dev);
1191 if (!drm_fb_helper_is_bound(fb_helper)) {
1192 drm_modeset_unlock_all(dev);
1196 for (i = 0; i < fb_helper->crtc_count; i++) {
1197 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1198 crtc_funcs = crtc->helper_private;
1201 green = cmap->green;
1203 transp = cmap->transp;
1204 start = cmap->start;
1206 for (j = 0; j < cmap->len; j++) {
1207 u16 hred, hgreen, hblue, htransp = 0xffff;
1214 htransp = *transp++;
1216 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1220 if (crtc_funcs->load_lut)
1221 crtc_funcs->load_lut(crtc);
1224 drm_modeset_unlock_all(dev);
1227 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1230 * drm_fb_helper_check_var - implementation for ->fb_check_var
1231 * @var: screeninfo to check
1232 * @info: fbdev registered by the helper
1234 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1235 struct fb_info *info)
1237 struct drm_fb_helper *fb_helper = info->par;
1238 struct drm_framebuffer *fb = fb_helper->fb;
1241 if (in_dbg_master())
1244 if (var->pixclock != 0) {
1245 DRM_DEBUG("fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1249 /* Need to resize the fb object !!! */
1250 if (var->bits_per_pixel > fb->bits_per_pixel ||
1251 var->xres > fb->width || var->yres > fb->height ||
1252 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1253 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1254 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1255 var->xres, var->yres, var->bits_per_pixel,
1256 var->xres_virtual, var->yres_virtual,
1257 fb->width, fb->height, fb->bits_per_pixel);
1261 switch (var->bits_per_pixel) {
1263 depth = (var->green.length == 6) ? 16 : 15;
1266 depth = (var->transp.length > 0) ? 32 : 24;
1269 depth = var->bits_per_pixel;
1275 var->red.offset = 0;
1276 var->green.offset = 0;
1277 var->blue.offset = 0;
1278 var->red.length = 8;
1279 var->green.length = 8;
1280 var->blue.length = 8;
1281 var->transp.length = 0;
1282 var->transp.offset = 0;
1285 var->red.offset = 10;
1286 var->green.offset = 5;
1287 var->blue.offset = 0;
1288 var->red.length = 5;
1289 var->green.length = 5;
1290 var->blue.length = 5;
1291 var->transp.length = 1;
1292 var->transp.offset = 15;
1295 var->red.offset = 11;
1296 var->green.offset = 5;
1297 var->blue.offset = 0;
1298 var->red.length = 5;
1299 var->green.length = 6;
1300 var->blue.length = 5;
1301 var->transp.length = 0;
1302 var->transp.offset = 0;
1305 var->red.offset = 16;
1306 var->green.offset = 8;
1307 var->blue.offset = 0;
1308 var->red.length = 8;
1309 var->green.length = 8;
1310 var->blue.length = 8;
1311 var->transp.length = 0;
1312 var->transp.offset = 0;
1315 var->red.offset = 16;
1316 var->green.offset = 8;
1317 var->blue.offset = 0;
1318 var->red.length = 8;
1319 var->green.length = 8;
1320 var->blue.length = 8;
1321 var->transp.length = 8;
1322 var->transp.offset = 24;
1329 EXPORT_SYMBOL(drm_fb_helper_check_var);
1332 * drm_fb_helper_set_par - implementation for ->fb_set_par
1333 * @info: fbdev registered by the helper
1335 * This will let fbcon do the mode init and is called at initialization time by
1336 * the fbdev core when registering the driver, and later on through the hotplug
1339 int drm_fb_helper_set_par(struct fb_info *info)
1341 struct drm_fb_helper *fb_helper = info->par;
1342 struct fb_var_screeninfo *var = &info->var;
1344 if (oops_in_progress)
1347 if (var->pixclock != 0) {
1348 DRM_ERROR("PIXEL CLOCK SET\n");
1352 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1356 EXPORT_SYMBOL(drm_fb_helper_set_par);
1358 static int pan_display_atomic(struct fb_var_screeninfo *var,
1359 struct fb_info *info)
1361 struct drm_fb_helper *fb_helper = info->par;
1362 struct drm_device *dev = fb_helper->dev;
1363 struct drm_atomic_state *state;
1364 struct drm_plane *plane;
1366 unsigned plane_mask;
1368 state = drm_atomic_state_alloc(dev);
1372 state->acquire_ctx = dev->mode_config.acquire_ctx;
1375 for(i = 0; i < fb_helper->crtc_count; i++) {
1376 struct drm_mode_set *mode_set;
1378 mode_set = &fb_helper->crtc_info[i].mode_set;
1380 mode_set->x = var->xoffset;
1381 mode_set->y = var->yoffset;
1383 ret = __drm_atomic_helper_set_config(mode_set, state);
1387 plane = mode_set->crtc->primary;
1388 plane_mask |= (1 << drm_plane_index(plane));
1389 plane->old_fb = plane->fb;
1392 ret = drm_atomic_commit(state);
1396 info->var.xoffset = var->xoffset;
1397 info->var.yoffset = var->yoffset;
1401 drm_atomic_clean_old_fb(dev, plane_mask, ret);
1403 if (ret == -EDEADLK)
1407 drm_atomic_state_free(state);
1412 drm_atomic_state_clear(state);
1413 drm_atomic_legacy_backoff(state);
1419 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1420 * @var: updated screen information
1421 * @info: fbdev registered by the helper
1423 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1424 struct fb_info *info)
1426 struct drm_fb_helper *fb_helper = info->par;
1427 struct drm_device *dev = fb_helper->dev;
1428 struct drm_mode_set *modeset;
1432 if (oops_in_progress)
1435 drm_modeset_lock_all(dev);
1436 if (!drm_fb_helper_is_bound(fb_helper)) {
1437 drm_modeset_unlock_all(dev);
1441 if (dev->mode_config.funcs->atomic_commit) {
1442 ret = pan_display_atomic(var, info);
1446 for (i = 0; i < fb_helper->crtc_count; i++) {
1447 modeset = &fb_helper->crtc_info[i].mode_set;
1449 modeset->x = var->xoffset;
1450 modeset->y = var->yoffset;
1452 if (modeset->num_connectors) {
1453 ret = drm_mode_set_config_internal(modeset);
1455 info->var.xoffset = var->xoffset;
1456 info->var.yoffset = var->yoffset;
1461 drm_modeset_unlock_all(dev);
1464 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1467 * Allocates the backing storage and sets up the fbdev info structure through
1468 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1471 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1477 struct fb_info *info;
1478 struct drm_fb_helper_surface_size sizes;
1481 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1482 sizes.surface_depth = 24;
1483 sizes.surface_bpp = 32;
1484 sizes.fb_width = (unsigned)-1;
1485 sizes.fb_height = (unsigned)-1;
1487 /* if driver picks 8 or 16 by default use that
1488 for both depth/bpp */
1489 if (preferred_bpp != sizes.surface_bpp)
1490 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1492 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1493 for (i = 0; i < fb_helper->connector_count; i++) {
1494 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1495 struct drm_cmdline_mode *cmdline_mode;
1497 cmdline_mode = &fb_helper_conn->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;
1524 for (i = 0; i < fb_helper->crtc_count; i++) {
1525 struct drm_display_mode *desired_mode;
1526 struct drm_mode_set *mode_set;
1528 /* in case of tile group, are we the last tile vert or horiz?
1529 * If no tile group you are always the last one both vertically
1532 bool lastv = true, lasth = true;
1534 desired_mode = fb_helper->crtc_info[i].desired_mode;
1535 mode_set = &fb_helper->crtc_info[i].mode_set;
1542 x = fb_helper->crtc_info[i].x;
1543 y = fb_helper->crtc_info[i].y;
1545 if (gamma_size == 0)
1546 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1548 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1549 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1551 for (j = 0; j < mode_set->num_connectors; j++) {
1552 struct drm_connector *connector = mode_set->connectors[j];
1553 if (connector->has_tile) {
1554 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1555 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1556 /* cloning to multiple tiles is just crazy-talk, so: */
1562 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1564 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1567 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1568 /* hmm everyone went away - assume VGA cable just fell out
1569 and will come back later. */
1570 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1571 sizes.fb_width = sizes.surface_width = 1024;
1572 sizes.fb_height = sizes.surface_height = 768;
1575 /* push down into drivers */
1576 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1580 info = fb_helper->fbdev;
1583 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1584 * events, but at init time drm_setup_crtcs needs to be called before
1585 * the fb is allocated (since we need to figure out the desired size of
1586 * the fb before we can allocate it ...). Hence we need to fix things up
1589 for (i = 0; i < fb_helper->crtc_count; i++)
1590 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1591 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1594 info->var.pixclock = 0;
1595 if (register_framebuffer(info) < 0)
1598 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1599 info->node, info->fix.id);
1601 if (list_empty(&kernel_fb_helper_list)) {
1602 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1605 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1611 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1612 * @info: fbdev registered by the helper
1613 * @pitch: desired pitch
1614 * @depth: desired depth
1616 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1617 * fbdev emulations. Drivers which support acceleration methods which impose
1618 * additional constraints need to set up their own limits.
1620 * Drivers should call this (or their equivalent setup code) from their
1621 * ->fb_probe callback.
1623 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1626 info->fix.type = FB_TYPE_PACKED_PIXELS;
1627 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1628 FB_VISUAL_TRUECOLOR;
1629 info->fix.mmio_start = 0;
1630 info->fix.mmio_len = 0;
1631 info->fix.type_aux = 0;
1632 info->fix.xpanstep = 1; /* doing it in hw */
1633 info->fix.ypanstep = 1; /* doing it in hw */
1634 info->fix.ywrapstep = 0;
1635 info->fix.accel = FB_ACCEL_NONE;
1637 info->fix.line_length = pitch;
1640 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1643 * drm_fb_helper_fill_var - initalizes variable fbdev information
1644 * @info: fbdev instance to set up
1645 * @fb_helper: fb helper instance to use as template
1646 * @fb_width: desired fb width
1647 * @fb_height: desired fb height
1649 * Sets up the variable fbdev metainformation from the given fb helper instance
1650 * and the drm framebuffer allocated in fb_helper->fb.
1652 * Drivers should call this (or their equivalent setup code) from their
1653 * ->fb_probe callback after having allocated the fbdev backing
1654 * storage framebuffer.
1656 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1657 uint32_t fb_width, uint32_t fb_height)
1659 struct drm_framebuffer *fb = fb_helper->fb;
1660 info->pseudo_palette = fb_helper->pseudo_palette;
1661 info->var.xres_virtual = fb->width;
1662 info->var.yres_virtual = fb->height;
1663 info->var.bits_per_pixel = fb->bits_per_pixel;
1664 info->var.accel_flags = FB_ACCELF_TEXT;
1665 info->var.xoffset = 0;
1666 info->var.yoffset = 0;
1667 info->var.activate = FB_ACTIVATE_NOW;
1668 info->var.height = -1;
1669 info->var.width = -1;
1671 switch (fb->depth) {
1673 info->var.red.offset = 0;
1674 info->var.green.offset = 0;
1675 info->var.blue.offset = 0;
1676 info->var.red.length = 8; /* 8bit DAC */
1677 info->var.green.length = 8;
1678 info->var.blue.length = 8;
1679 info->var.transp.offset = 0;
1680 info->var.transp.length = 0;
1683 info->var.red.offset = 10;
1684 info->var.green.offset = 5;
1685 info->var.blue.offset = 0;
1686 info->var.red.length = 5;
1687 info->var.green.length = 5;
1688 info->var.blue.length = 5;
1689 info->var.transp.offset = 15;
1690 info->var.transp.length = 1;
1693 info->var.red.offset = 11;
1694 info->var.green.offset = 5;
1695 info->var.blue.offset = 0;
1696 info->var.red.length = 5;
1697 info->var.green.length = 6;
1698 info->var.blue.length = 5;
1699 info->var.transp.offset = 0;
1702 info->var.red.offset = 16;
1703 info->var.green.offset = 8;
1704 info->var.blue.offset = 0;
1705 info->var.red.length = 8;
1706 info->var.green.length = 8;
1707 info->var.blue.length = 8;
1708 info->var.transp.offset = 0;
1709 info->var.transp.length = 0;
1712 info->var.red.offset = 16;
1713 info->var.green.offset = 8;
1714 info->var.blue.offset = 0;
1715 info->var.red.length = 8;
1716 info->var.green.length = 8;
1717 info->var.blue.length = 8;
1718 info->var.transp.offset = 24;
1719 info->var.transp.length = 8;
1725 info->var.xres = fb_width;
1726 info->var.yres = fb_height;
1728 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1730 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1734 struct drm_connector *connector;
1738 for (i = 0; i < fb_helper->connector_count; i++) {
1739 connector = fb_helper->connector_info[i]->connector;
1740 count += connector->funcs->fill_modes(connector, maxX, maxY);
1746 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1748 struct drm_display_mode *mode;
1750 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1751 if (mode->hdisplay > width ||
1752 mode->vdisplay > height)
1754 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1759 EXPORT_SYMBOL(drm_has_preferred_mode);
1761 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1763 return fb_connector->connector->cmdline_mode.specified;
1766 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1767 int width, int height)
1769 struct drm_cmdline_mode *cmdline_mode;
1770 struct drm_display_mode *mode;
1771 bool prefer_non_interlace;
1773 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1774 if (cmdline_mode->specified == false)
1777 /* attempt to find a matching mode in the list of modes
1778 * we have gotten so far, if not add a CVT mode that conforms
1780 if (cmdline_mode->rb || cmdline_mode->margins)
1783 prefer_non_interlace = !cmdline_mode->interlace;
1785 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1786 /* check width/height */
1787 if (mode->hdisplay != cmdline_mode->xres ||
1788 mode->vdisplay != cmdline_mode->yres)
1791 if (cmdline_mode->refresh_specified) {
1792 if (mode->vrefresh != cmdline_mode->refresh)
1796 if (cmdline_mode->interlace) {
1797 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1799 } else if (prefer_non_interlace) {
1800 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1806 if (prefer_non_interlace) {
1807 prefer_non_interlace = false;
1812 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1814 list_add(&mode->head, &fb_helper_conn->connector->modes);
1817 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1819 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1824 enable = connector->status == connector_status_connected;
1826 enable = connector->status != connector_status_disconnected;
1831 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1834 bool any_enabled = false;
1835 struct drm_connector *connector;
1838 for (i = 0; i < fb_helper->connector_count; i++) {
1839 connector = fb_helper->connector_info[i]->connector;
1840 enabled[i] = drm_connector_enabled(connector, true);
1841 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1842 enabled[i] ? "yes" : "no");
1843 any_enabled |= enabled[i];
1849 for (i = 0; i < fb_helper->connector_count; i++) {
1850 connector = fb_helper->connector_info[i]->connector;
1851 enabled[i] = drm_connector_enabled(connector, false);
1855 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1856 struct drm_display_mode **modes,
1857 struct drm_fb_offset *offsets,
1858 bool *enabled, int width, int height)
1861 bool can_clone = false;
1862 struct drm_fb_helper_connector *fb_helper_conn;
1863 struct drm_display_mode *dmt_mode, *mode;
1865 /* only contemplate cloning in the single crtc case */
1866 if (fb_helper->crtc_count > 1)
1870 for (i = 0; i < fb_helper->connector_count; i++) {
1875 /* only contemplate cloning if more than one connector is enabled */
1879 /* check the command line or if nothing common pick 1024x768 */
1881 for (i = 0; i < fb_helper->connector_count; i++) {
1884 fb_helper_conn = fb_helper->connector_info[i];
1885 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1890 for (j = 0; j < i; j++) {
1893 if (!drm_mode_equal(modes[j], modes[i]))
1899 DRM_DEBUG_KMS("can clone using command line\n");
1903 /* try and find a 1024x768 mode on each connector */
1905 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1907 for (i = 0; i < fb_helper->connector_count; i++) {
1912 fb_helper_conn = fb_helper->connector_info[i];
1913 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1914 if (drm_mode_equal(mode, dmt_mode))
1922 DRM_DEBUG_KMS("can clone using 1024x768\n");
1925 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1929 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1930 struct drm_display_mode **modes,
1931 struct drm_fb_offset *offsets,
1933 int h_idx, int v_idx)
1935 struct drm_fb_helper_connector *fb_helper_conn;
1937 int hoffset = 0, voffset = 0;
1939 for (i = 0; i < fb_helper->connector_count; i++) {
1940 fb_helper_conn = fb_helper->connector_info[i];
1941 if (!fb_helper_conn->connector->has_tile)
1944 if (!modes[i] && (h_idx || v_idx)) {
1945 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1946 fb_helper_conn->connector->base.id);
1949 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1950 hoffset += modes[i]->hdisplay;
1952 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1953 voffset += modes[i]->vdisplay;
1955 offsets[idx].x = hoffset;
1956 offsets[idx].y = voffset;
1957 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1961 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1962 struct drm_display_mode **modes,
1963 struct drm_fb_offset *offsets,
1964 bool *enabled, int width, int height)
1966 struct drm_fb_helper_connector *fb_helper_conn;
1968 uint64_t conn_configured = 0, mask;
1970 mask = (1 << fb_helper->connector_count) - 1;
1972 for (i = 0; i < fb_helper->connector_count; i++) {
1973 fb_helper_conn = fb_helper->connector_info[i];
1975 if (conn_configured & (1 << i))
1978 if (enabled[i] == false) {
1979 conn_configured |= (1 << i);
1983 /* first pass over all the untiled connectors */
1984 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1987 if (tile_pass == 1) {
1988 if (fb_helper_conn->connector->tile_h_loc != 0 ||
1989 fb_helper_conn->connector->tile_v_loc != 0)
1993 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1994 fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1995 /* if this tile_pass doesn't cover any of the tiles - keep going */
1998 /* find the tile offsets for this pass - need
1999 to find all tiles left and above */
2000 drm_get_tile_offsets(fb_helper, modes, offsets,
2001 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
2003 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
2004 fb_helper_conn->connector->base.id);
2006 /* got for command line mode first */
2007 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
2009 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
2010 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
2011 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
2013 /* No preferred modes, pick one off the list */
2014 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
2015 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
2018 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
2020 conn_configured |= (1 << i);
2023 if ((conn_configured & mask) != mask) {
2030 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
2031 struct drm_fb_helper_crtc **best_crtcs,
2032 struct drm_display_mode **modes,
2033 int n, int width, int height)
2036 struct drm_connector *connector;
2037 const struct drm_connector_helper_funcs *connector_funcs;
2038 struct drm_encoder *encoder;
2039 int my_score, best_score, score;
2040 struct drm_fb_helper_crtc **crtcs, *crtc;
2041 struct drm_fb_helper_connector *fb_helper_conn;
2043 if (n == fb_helper->connector_count)
2046 fb_helper_conn = fb_helper->connector_info[n];
2047 connector = fb_helper_conn->connector;
2049 best_crtcs[n] = NULL;
2050 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
2051 if (modes[n] == NULL)
2054 crtcs = kzalloc(fb_helper->connector_count *
2055 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2060 if (connector->status == connector_status_connected)
2062 if (drm_has_cmdline_mode(fb_helper_conn))
2064 if (drm_has_preferred_mode(fb_helper_conn, width, height))
2067 connector_funcs = connector->helper_private;
2070 * If the DRM device implements atomic hooks and ->best_encoder() is
2071 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2074 if (fb_helper->dev->mode_config.funcs->atomic_commit &&
2075 !connector_funcs->best_encoder)
2076 encoder = drm_atomic_helper_best_encoder(connector);
2078 encoder = connector_funcs->best_encoder(connector);
2083 /* select a crtc for this connector and then attempt to configure
2084 remaining connectors */
2085 for (c = 0; c < fb_helper->crtc_count; c++) {
2086 crtc = &fb_helper->crtc_info[c];
2088 if ((encoder->possible_crtcs & (1 << c)) == 0)
2091 for (o = 0; o < n; o++)
2092 if (best_crtcs[o] == crtc)
2096 /* ignore cloning unless only a single crtc */
2097 if (fb_helper->crtc_count > 1)
2100 if (!drm_mode_equal(modes[o], modes[n]))
2105 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2106 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2108 if (score > best_score) {
2110 memcpy(best_crtcs, crtcs,
2111 fb_helper->connector_count *
2112 sizeof(struct drm_fb_helper_crtc *));
2120 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2122 struct drm_device *dev = fb_helper->dev;
2123 struct drm_fb_helper_crtc **crtcs;
2124 struct drm_display_mode **modes;
2125 struct drm_fb_offset *offsets;
2130 DRM_DEBUG_KMS("\n");
2132 width = dev->mode_config.max_width;
2133 height = dev->mode_config.max_height;
2135 crtcs = kcalloc(fb_helper->connector_count,
2136 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2137 modes = kcalloc(fb_helper->connector_count,
2138 sizeof(struct drm_display_mode *), GFP_KERNEL);
2139 offsets = kcalloc(fb_helper->connector_count,
2140 sizeof(struct drm_fb_offset), GFP_KERNEL);
2141 enabled = kcalloc(fb_helper->connector_count,
2142 sizeof(bool), GFP_KERNEL);
2143 if (!crtcs || !modes || !enabled || !offsets) {
2144 DRM_ERROR("Memory allocation failed\n");
2149 drm_enable_connectors(fb_helper, enabled);
2151 if (!(fb_helper->funcs->initial_config &&
2152 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2154 enabled, width, height))) {
2155 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2156 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2157 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2159 if (!drm_target_cloned(fb_helper, modes, offsets,
2160 enabled, width, height) &&
2161 !drm_target_preferred(fb_helper, modes, offsets,
2162 enabled, width, height))
2163 DRM_ERROR("Unable to find initial modes\n");
2165 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2168 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2171 /* need to set the modesets up here for use later */
2172 /* fill out the connector<->crtc mappings into the modesets */
2173 for (i = 0; i < fb_helper->crtc_count; i++)
2174 drm_fb_helper_modeset_release(fb_helper,
2175 &fb_helper->crtc_info[i].mode_set);
2177 for (i = 0; i < fb_helper->connector_count; i++) {
2178 struct drm_display_mode *mode = modes[i];
2179 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2180 struct drm_fb_offset *offset = &offsets[i];
2181 struct drm_mode_set *modeset = &fb_crtc->mode_set;
2183 if (mode && fb_crtc) {
2184 struct drm_connector *connector =
2185 fb_helper->connector_info[i]->connector;
2187 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2188 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2190 fb_crtc->desired_mode = mode;
2191 fb_crtc->x = offset->x;
2192 fb_crtc->y = offset->y;
2193 modeset->mode = drm_mode_duplicate(dev,
2194 fb_crtc->desired_mode);
2195 drm_connector_reference(connector);
2196 modeset->connectors[modeset->num_connectors++] = connector;
2197 modeset->fb = fb_helper->fb;
2198 modeset->x = offset->x;
2199 modeset->y = offset->y;
2210 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2211 * @fb_helper: fb_helper device struct
2212 * @bpp_sel: bpp value to use for the framebuffer configuration
2214 * Scans the CRTCs and connectors and tries to put together an initial setup.
2215 * At the moment, this is a cloned configuration across all heads with
2216 * a new framebuffer object as the backing store.
2218 * Note that this also registers the fbdev and so allows userspace to call into
2219 * the driver through the fbdev interfaces.
2221 * This function will call down into the ->fb_probe callback to let
2222 * the driver allocate and initialize the fbdev info structure and the drm
2223 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2224 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2225 * values for the fbdev info structure.
2229 * When you have fbcon support built-in or already loaded, this function will do
2230 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2231 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2232 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2233 * to consoles, not even serial console. This means when your driver crashes,
2234 * you will see absolutely nothing else but a system stuck in this function,
2235 * with no further output. Any kind of printk() you place within your own driver
2236 * or in the drm core modeset code will also never show up.
2238 * Standard debug practice is to run the fbcon setup without taking the
2239 * console_lock as a hack, to be able to see backtraces and crashes on the
2240 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2243 * The other option is to just disable fbdev emulation since very likely the
2244 * first modeset from userspace will crash in the same way, and is even easier
2245 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2246 * kernel cmdline option.
2249 * Zero if everything went ok, nonzero otherwise.
2251 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2253 struct drm_device *dev = fb_helper->dev;
2256 if (!drm_fbdev_emulation)
2259 mutex_lock(&dev->mode_config.mutex);
2260 count = drm_fb_helper_probe_connector_modes(fb_helper,
2261 dev->mode_config.max_width,
2262 dev->mode_config.max_height);
2263 mutex_unlock(&dev->mode_config.mutex);
2265 * we shouldn't end up with no modes here.
2268 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2270 drm_setup_crtcs(fb_helper);
2272 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2274 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2277 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2278 * probing all the outputs attached to the fb
2279 * @fb_helper: the drm_fb_helper
2281 * Scan the connectors attached to the fb_helper and try to put together a
2282 * setup after notification of a change in output configuration.
2284 * Called at runtime, takes the mode config locks to be able to check/change the
2285 * modeset configuration. Must be run from process context (which usually means
2286 * either the output polling work or a work item launched from the driver's
2287 * hotplug interrupt).
2289 * Note that drivers may call this even before calling
2290 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2291 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2292 * not miss any hotplug events.
2295 * 0 on success and a non-zero error code otherwise.
2297 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2299 struct drm_device *dev = fb_helper->dev;
2300 u32 max_width, max_height;
2302 if (!drm_fbdev_emulation)
2305 mutex_lock(&fb_helper->dev->mode_config.mutex);
2306 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2307 fb_helper->delayed_hotplug = true;
2308 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2311 DRM_DEBUG_KMS("\n");
2313 max_width = fb_helper->fb->width;
2314 max_height = fb_helper->fb->height;
2316 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2317 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2319 drm_modeset_lock_all(dev);
2320 drm_setup_crtcs(fb_helper);
2321 drm_modeset_unlock_all(dev);
2322 drm_fb_helper_set_par(fb_helper->fbdev);
2326 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);