2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
42 static LIST_HEAD(kernel_fb_helper_list);
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independently from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
53 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
54 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
55 * default behaviour can override the third step with their own code.
56 * Teardown is done with drm_fb_helper_fini().
58 * At runtime drivers should restore the fbdev console by calling
59 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
60 * should also notify the fb helper code from updates to the output
61 * configuration by calling drm_fb_helper_hotplug_event(). For easier
62 * integration with the output polling code in drm_crtc_helper.c the modeset
63 * code provides a ->output_poll_changed callback.
65 * All other functions exported by the fb helper library can be used to
66 * implement the fbdev driver interface by the driver.
68 * It is possible, though perhaps somewhat tricky, to implement race-free
69 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
70 * helper must be called first to initialize the minimum required to make
71 * hotplug detection work. Drivers also need to make sure to properly set up
72 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
73 * it is safe to enable interrupts and start processing hotplug events. At the
74 * same time, drivers should initialize all modeset objects such as CRTCs,
75 * encoders and connectors. To finish up the fbdev helper initialization, the
76 * drm_fb_helper_init() function is called. To probe for all attached displays
77 * and set up an initial configuration using the detected hardware, drivers
78 * should call drm_fb_helper_single_add_all_connectors() followed by
79 * drm_fb_helper_initial_config().
83 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
85 * @fb_helper: fbdev initialized with drm_fb_helper_init
87 * This functions adds all the available connectors for use with the given
88 * fb_helper. This is a separate step to allow drivers to freely assign
89 * connectors to the fbdev, e.g. if some are reserved for special purposes or
90 * not adequate to be used for the fbcon.
92 * This function is protected against concurrent connector hotadds/removals
93 * using drm_fb_helper_add_one_connector() and
94 * drm_fb_helper_remove_one_connector().
96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
98 struct drm_device *dev = fb_helper->dev;
99 struct drm_connector *connector;
102 mutex_lock(&dev->mode_config.mutex);
103 drm_for_each_connector(connector, dev) {
104 struct drm_fb_helper_connector *fb_helper_connector;
106 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
107 if (!fb_helper_connector)
110 fb_helper_connector->connector = connector;
111 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
113 mutex_unlock(&dev->mode_config.mutex);
116 for (i = 0; i < fb_helper->connector_count; i++) {
117 kfree(fb_helper->connector_info[i]);
118 fb_helper->connector_info[i] = NULL;
120 fb_helper->connector_count = 0;
121 mutex_unlock(&dev->mode_config.mutex);
125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
127 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
129 struct drm_fb_helper_connector **temp;
130 struct drm_fb_helper_connector *fb_helper_connector;
132 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
133 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
134 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
138 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
139 fb_helper->connector_info = temp;
143 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
144 if (!fb_helper_connector)
147 fb_helper_connector->connector = connector;
148 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
153 static void remove_from_modeset(struct drm_mode_set *set,
154 struct drm_connector *connector)
158 for (i = 0; i < set->num_connectors; i++) {
159 if (set->connectors[i] == connector)
163 if (i == set->num_connectors)
166 for (j = i + 1; j < set->num_connectors; j++) {
167 set->connectors[j - 1] = set->connectors[j];
169 set->num_connectors--;
171 /* because i915 is pissy about this..
172 * TODO maybe need to makes sure we set it back to !=NULL somewhere?
174 if (set->num_connectors == 0)
178 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
179 struct drm_connector *connector)
181 struct drm_fb_helper_connector *fb_helper_connector;
184 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
186 for (i = 0; i < fb_helper->connector_count; i++) {
187 if (fb_helper->connector_info[i]->connector == connector)
191 if (i == fb_helper->connector_count)
193 fb_helper_connector = fb_helper->connector_info[i];
195 for (j = i + 1; j < fb_helper->connector_count; j++) {
196 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
198 fb_helper->connector_count--;
199 kfree(fb_helper_connector);
201 /* also cleanup dangling references to the connector: */
202 for (i = 0; i < fb_helper->crtc_count; i++)
203 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
207 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
209 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
211 uint16_t *r_base, *g_base, *b_base;
214 if (helper->funcs->gamma_get == NULL)
217 r_base = crtc->gamma_store;
218 g_base = r_base + crtc->gamma_size;
219 b_base = g_base + crtc->gamma_size;
221 for (i = 0; i < crtc->gamma_size; i++)
222 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
225 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
227 uint16_t *r_base, *g_base, *b_base;
229 if (crtc->funcs->gamma_set == NULL)
232 r_base = crtc->gamma_store;
233 g_base = r_base + crtc->gamma_size;
234 b_base = g_base + crtc->gamma_size;
236 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
240 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
241 * @info: fbdev registered by the helper
243 int drm_fb_helper_debug_enter(struct fb_info *info)
245 struct drm_fb_helper *helper = info->par;
246 const struct drm_crtc_helper_funcs *funcs;
249 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
250 for (i = 0; i < helper->crtc_count; i++) {
251 struct drm_mode_set *mode_set =
252 &helper->crtc_info[i].mode_set;
254 if (!mode_set->crtc->enabled)
257 funcs = mode_set->crtc->helper_private;
258 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
259 funcs->mode_set_base_atomic(mode_set->crtc,
263 ENTER_ATOMIC_MODE_SET);
269 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
271 /* Find the real fb for a given fb helper CRTC */
272 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
274 struct drm_device *dev = crtc->dev;
277 drm_for_each_crtc(c, dev) {
278 if (crtc->base.id == c->base.id)
279 return c->primary->fb;
286 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
287 * @info: fbdev registered by the helper
289 int drm_fb_helper_debug_leave(struct fb_info *info)
291 struct drm_fb_helper *helper = info->par;
292 struct drm_crtc *crtc;
293 const struct drm_crtc_helper_funcs *funcs;
294 struct drm_framebuffer *fb;
297 for (i = 0; i < helper->crtc_count; i++) {
298 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
299 crtc = mode_set->crtc;
300 funcs = crtc->helper_private;
301 fb = drm_mode_config_fb(crtc);
307 DRM_ERROR("no fb to restore??\n");
311 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
312 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
313 crtc->y, LEAVE_ATOMIC_MODE_SET);
318 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
320 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
322 struct drm_device *dev = fb_helper->dev;
323 struct drm_plane *plane;
327 drm_warn_on_modeset_not_all_locked(dev);
329 drm_for_each_plane(plane, dev) {
330 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
331 drm_plane_force_disable(plane);
333 if (dev->mode_config.rotation_property) {
334 drm_mode_plane_set_obj_prop(plane,
335 dev->mode_config.rotation_property,
340 for (i = 0; i < fb_helper->crtc_count; i++) {
341 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
342 struct drm_crtc *crtc = mode_set->crtc;
345 if (crtc->funcs->cursor_set) {
346 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
351 ret = drm_mode_set_config_internal(mode_set);
358 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
359 * @fb_helper: fbcon to restore
361 * This should be called from driver's drm ->lastclose callback
362 * when implementing an fbcon on top of kms using this helper. This ensures that
363 * the user isn't greeted with a black screen when e.g. X dies.
365 * Use this variant if you need to bypass locking (panic), or already
366 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
368 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
370 return restore_fbdev_mode(fb_helper);
374 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
375 * @fb_helper: fbcon to restore
377 * This should be called from driver's drm ->lastclose callback
378 * when implementing an fbcon on top of kms using this helper. This ensures that
379 * the user isn't greeted with a black screen when e.g. X dies.
381 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
383 struct drm_device *dev = fb_helper->dev;
385 bool do_delayed = false;
387 drm_modeset_lock_all(dev);
388 ret = restore_fbdev_mode(fb_helper);
390 do_delayed = fb_helper->delayed_hotplug;
392 fb_helper->delayed_hotplug = false;
393 drm_modeset_unlock_all(dev);
396 drm_fb_helper_hotplug_event(fb_helper);
399 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
402 * restore fbcon display for all kms driver's using this helper, used for sysrq
403 * and panic handling.
405 static bool drm_fb_helper_force_kernel_mode(void)
407 bool ret, error = false;
408 struct drm_fb_helper *helper;
410 if (list_empty(&kernel_fb_helper_list))
413 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
414 struct drm_device *dev = helper->dev;
416 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
420 * NOTE: Use trylock mode to avoid deadlocks and sleeping in
423 if (__drm_modeset_lock_all(dev, true) != 0) {
428 ret = drm_fb_helper_restore_fbdev_mode(helper);
432 drm_modeset_unlock_all(dev);
437 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
439 struct drm_device *dev = fb_helper->dev;
440 struct drm_crtc *crtc;
441 int bound = 0, crtcs_bound = 0;
443 /* Sometimes user space wants everything disabled, so don't steal the
444 * display if there's a master. */
445 if (dev->primary->master)
448 drm_for_each_crtc(crtc, dev) {
449 if (crtc->primary->fb)
451 if (crtc->primary->fb == fb_helper->fb)
455 if (bound < crtcs_bound)
461 #ifdef CONFIG_MAGIC_SYSRQ
462 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
465 ret = drm_fb_helper_force_kernel_mode();
467 DRM_ERROR("Failed to restore crtc configuration\n");
469 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
471 static void drm_fb_helper_sysrq(int dummy1)
473 schedule_work(&drm_fb_helper_restore_work);
476 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
477 .handler = drm_fb_helper_sysrq,
478 .help_msg = "force-fb(V)",
479 .action_msg = "Restore framebuffer console",
482 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
485 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
487 struct drm_fb_helper *fb_helper = info->par;
488 struct drm_device *dev = fb_helper->dev;
489 struct drm_crtc *crtc;
490 struct drm_connector *connector;
494 * For each CRTC in this fb, turn the connectors on/off.
496 drm_modeset_lock_all(dev);
497 if (!drm_fb_helper_is_bound(fb_helper)) {
498 drm_modeset_unlock_all(dev);
502 for (i = 0; i < fb_helper->crtc_count; i++) {
503 crtc = fb_helper->crtc_info[i].mode_set.crtc;
508 /* Walk the connectors & encoders on this fb turning them on/off */
509 for (j = 0; j < fb_helper->connector_count; j++) {
510 connector = fb_helper->connector_info[j]->connector;
511 connector->funcs->dpms(connector, dpms_mode);
512 drm_object_property_set_value(&connector->base,
513 dev->mode_config.dpms_property, dpms_mode);
516 drm_modeset_unlock_all(dev);
520 * drm_fb_helper_blank - implementation for ->fb_blank
521 * @blank: desired blanking state
522 * @info: fbdev registered by the helper
524 int drm_fb_helper_blank(int blank, struct fb_info *info)
526 if (oops_in_progress)
530 /* Display: On; HSync: On, VSync: On */
531 case FB_BLANK_UNBLANK:
532 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
534 /* Display: Off; HSync: On, VSync: On */
535 case FB_BLANK_NORMAL:
536 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
538 /* Display: Off; HSync: Off, VSync: On */
539 case FB_BLANK_HSYNC_SUSPEND:
540 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
542 /* Display: Off; HSync: On, VSync: Off */
543 case FB_BLANK_VSYNC_SUSPEND:
544 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
546 /* Display: Off; HSync: Off, VSync: Off */
547 case FB_BLANK_POWERDOWN:
548 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
553 EXPORT_SYMBOL(drm_fb_helper_blank);
555 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
559 for (i = 0; i < helper->connector_count; i++)
560 kfree(helper->connector_info[i]);
561 kfree(helper->connector_info);
562 for (i = 0; i < helper->crtc_count; i++) {
563 kfree(helper->crtc_info[i].mode_set.connectors);
564 if (helper->crtc_info[i].mode_set.mode)
565 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
567 kfree(helper->crtc_info);
571 * drm_fb_helper_prepare - setup a drm_fb_helper structure
573 * @helper: driver-allocated fbdev helper structure to set up
574 * @funcs: pointer to structure of functions associate with this helper
576 * Sets up the bare minimum to make the framebuffer helper usable. This is
577 * useful to implement race-free initialization of the polling helpers.
579 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
580 const struct drm_fb_helper_funcs *funcs)
582 INIT_LIST_HEAD(&helper->kernel_fb_list);
583 helper->funcs = funcs;
586 EXPORT_SYMBOL(drm_fb_helper_prepare);
589 * drm_fb_helper_init - initialize a drm_fb_helper structure
591 * @fb_helper: driver-allocated fbdev helper structure to initialize
592 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
593 * @max_conn_count: max connector count
595 * This allocates the structures for the fbdev helper with the given limits.
596 * Note that this won't yet touch the hardware (through the driver interfaces)
597 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
598 * to allow driver writes more control over the exact init sequence.
600 * Drivers must call drm_fb_helper_prepare() before calling this function.
603 * Zero if everything went ok, nonzero otherwise.
605 int drm_fb_helper_init(struct drm_device *dev,
606 struct drm_fb_helper *fb_helper,
607 int crtc_count, int max_conn_count)
609 struct drm_crtc *crtc;
615 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
616 if (!fb_helper->crtc_info)
619 fb_helper->crtc_count = crtc_count;
620 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
621 if (!fb_helper->connector_info) {
622 kfree(fb_helper->crtc_info);
625 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
626 fb_helper->connector_count = 0;
628 for (i = 0; i < crtc_count; i++) {
629 fb_helper->crtc_info[i].mode_set.connectors =
630 kcalloc(max_conn_count,
631 sizeof(struct drm_connector *),
634 if (!fb_helper->crtc_info[i].mode_set.connectors)
636 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
640 drm_for_each_crtc(crtc, dev) {
641 fb_helper->crtc_info[i].mode_set.crtc = crtc;
647 drm_fb_helper_crtc_free(fb_helper);
650 EXPORT_SYMBOL(drm_fb_helper_init);
653 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
654 * @fb_helper: driver-allocated fbdev helper
656 * A helper to alloc fb_info and the members cmap and apertures. Called
657 * by the driver within the fb_probe fb_helper callback function.
660 * fb_info pointer if things went okay, pointer containing error code
663 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
665 struct device *dev = fb_helper->dev->dev;
666 struct fb_info *info;
669 info = framebuffer_alloc(0, dev);
671 return ERR_PTR(-ENOMEM);
673 ret = fb_alloc_cmap(&info->cmap, 256, 0);
677 info->apertures = alloc_apertures(1);
678 if (!info->apertures) {
683 fb_helper->fbdev = info;
688 fb_dealloc_cmap(&info->cmap);
690 framebuffer_release(info);
693 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
696 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
697 * @fb_helper: driver-allocated fbdev helper
699 * A wrapper around unregister_framebuffer, to release the fb_info
702 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
704 if (fb_helper && fb_helper->fbdev)
705 unregister_framebuffer(fb_helper->fbdev);
707 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
710 * drm_fb_helper_release_fbi - dealloc fb_info and its members
711 * @fb_helper: driver-allocated fbdev helper
713 * A helper to free memory taken by fb_info and the members cmap and
716 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
719 struct fb_info *info = fb_helper->fbdev;
723 fb_dealloc_cmap(&info->cmap);
724 framebuffer_release(info);
727 fb_helper->fbdev = NULL;
730 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
732 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
734 if (!list_empty(&fb_helper->kernel_fb_list)) {
735 list_del(&fb_helper->kernel_fb_list);
736 if (list_empty(&kernel_fb_helper_list)) {
737 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
741 drm_fb_helper_crtc_free(fb_helper);
744 EXPORT_SYMBOL(drm_fb_helper_fini);
747 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
748 * @fb_helper: driver-allocated fbdev helper
750 * A wrapper around unlink_framebuffer implemented by fbdev core
752 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
754 if (fb_helper && fb_helper->fbdev)
755 unlink_framebuffer(fb_helper->fbdev);
757 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
760 * drm_fb_helper_sys_read - wrapper around fb_sys_read
761 * @info: fb_info struct pointer
762 * @buf: userspace buffer to read from framebuffer memory
763 * @count: number of bytes to read from framebuffer memory
764 * @ppos: read offset within framebuffer memory
766 * A wrapper around fb_sys_read implemented by fbdev core
768 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
769 size_t count, loff_t *ppos)
771 return fb_sys_read(info, buf, count, ppos);
773 EXPORT_SYMBOL(drm_fb_helper_sys_read);
776 * drm_fb_helper_sys_write - wrapper around fb_sys_write
777 * @info: fb_info struct pointer
778 * @buf: userspace buffer to write to framebuffer memory
779 * @count: number of bytes to write to framebuffer memory
780 * @ppos: write offset within framebuffer memory
782 * A wrapper around fb_sys_write implemented by fbdev core
784 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
785 size_t count, loff_t *ppos)
787 return fb_sys_write(info, buf, count, ppos);
789 EXPORT_SYMBOL(drm_fb_helper_sys_write);
792 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
793 * @info: fbdev registered by the helper
794 * @rect: info about rectangle to fill
796 * A wrapper around sys_fillrect implemented by fbdev core
798 void drm_fb_helper_sys_fillrect(struct fb_info *info,
799 const struct fb_fillrect *rect)
801 sys_fillrect(info, rect);
803 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
806 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
807 * @info: fbdev registered by the helper
808 * @area: info about area to copy
810 * A wrapper around sys_copyarea implemented by fbdev core
812 void drm_fb_helper_sys_copyarea(struct fb_info *info,
813 const struct fb_copyarea *area)
815 sys_copyarea(info, area);
817 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
820 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
821 * @info: fbdev registered by the helper
822 * @image: info about image to blit
824 * A wrapper around sys_imageblit implemented by fbdev core
826 void drm_fb_helper_sys_imageblit(struct fb_info *info,
827 const struct fb_image *image)
829 sys_imageblit(info, image);
831 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
834 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
835 * @info: fbdev registered by the helper
836 * @rect: info about rectangle to fill
838 * A wrapper around cfb_imageblit implemented by fbdev core
840 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
841 const struct fb_fillrect *rect)
843 cfb_fillrect(info, rect);
845 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
848 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
849 * @info: fbdev registered by the helper
850 * @area: info about area to copy
852 * A wrapper around cfb_copyarea implemented by fbdev core
854 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
855 const struct fb_copyarea *area)
857 cfb_copyarea(info, area);
859 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
862 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
863 * @info: fbdev registered by the helper
864 * @image: info about image to blit
866 * A wrapper around cfb_imageblit implemented by fbdev core
868 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
869 const struct fb_image *image)
871 cfb_imageblit(info, image);
873 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
876 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
877 * @fb_helper: driver-allocated fbdev helper
878 * @state: desired state, zero to resume, non-zero to suspend
880 * A wrapper around fb_set_suspend implemented by fbdev core
882 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
884 if (fb_helper && fb_helper->fbdev)
885 fb_set_suspend(fb_helper->fbdev, state);
887 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
889 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
890 u16 blue, u16 regno, struct fb_info *info)
892 struct drm_fb_helper *fb_helper = info->par;
893 struct drm_framebuffer *fb = fb_helper->fb;
896 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
899 /* place color in psuedopalette */
902 palette = (u32 *)info->pseudo_palette;
903 red >>= (16 - info->var.red.length);
904 green >>= (16 - info->var.green.length);
905 blue >>= (16 - info->var.blue.length);
906 value = (red << info->var.red.offset) |
907 (green << info->var.green.offset) |
908 (blue << info->var.blue.offset);
909 if (info->var.transp.length > 0) {
910 u32 mask = (1 << info->var.transp.length) - 1;
911 mask <<= info->var.transp.offset;
914 palette[regno] = value;
919 * The driver really shouldn't advertise pseudo/directcolor
920 * visuals if it can't deal with the palette.
922 if (WARN_ON(!fb_helper->funcs->gamma_set ||
923 !fb_helper->funcs->gamma_get))
928 if (fb->bits_per_pixel == 16) {
931 if (fb->depth == 16 && regno > 63)
933 if (fb->depth == 15 && regno > 31)
936 if (fb->depth == 16) {
940 for (i = 0; i < 8; i++)
941 fb_helper->funcs->gamma_set(crtc, red,
942 green, blue, pindex + i);
945 fb_helper->funcs->gamma_get(crtc, &r,
949 for (i = 0; i < 4; i++)
950 fb_helper->funcs->gamma_set(crtc, r,
957 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
962 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
964 * @info: fbdev registered by the helper
966 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
968 struct drm_fb_helper *fb_helper = info->par;
969 struct drm_device *dev = fb_helper->dev;
970 const struct drm_crtc_helper_funcs *crtc_funcs;
971 u16 *red, *green, *blue, *transp;
972 struct drm_crtc *crtc;
976 if (oops_in_progress)
979 drm_modeset_lock_all(dev);
980 if (!drm_fb_helper_is_bound(fb_helper)) {
981 drm_modeset_unlock_all(dev);
985 for (i = 0; i < fb_helper->crtc_count; i++) {
986 crtc = fb_helper->crtc_info[i].mode_set.crtc;
987 crtc_funcs = crtc->helper_private;
992 transp = cmap->transp;
995 for (j = 0; j < cmap->len; j++) {
996 u16 hred, hgreen, hblue, htransp = 0xffff;
1003 htransp = *transp++;
1005 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1009 if (crtc_funcs->load_lut)
1010 crtc_funcs->load_lut(crtc);
1013 drm_modeset_unlock_all(dev);
1016 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1019 * drm_fb_helper_check_var - implementation for ->fb_check_var
1020 * @var: screeninfo to check
1021 * @info: fbdev registered by the helper
1023 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1024 struct fb_info *info)
1026 struct drm_fb_helper *fb_helper = info->par;
1027 struct drm_framebuffer *fb = fb_helper->fb;
1030 if (var->pixclock != 0 || in_dbg_master())
1033 /* Need to resize the fb object !!! */
1034 if (var->bits_per_pixel > fb->bits_per_pixel ||
1035 var->xres > fb->width || var->yres > fb->height ||
1036 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1037 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1038 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1039 var->xres, var->yres, var->bits_per_pixel,
1040 var->xres_virtual, var->yres_virtual,
1041 fb->width, fb->height, fb->bits_per_pixel);
1045 switch (var->bits_per_pixel) {
1047 depth = (var->green.length == 6) ? 16 : 15;
1050 depth = (var->transp.length > 0) ? 32 : 24;
1053 depth = var->bits_per_pixel;
1059 var->red.offset = 0;
1060 var->green.offset = 0;
1061 var->blue.offset = 0;
1062 var->red.length = 8;
1063 var->green.length = 8;
1064 var->blue.length = 8;
1065 var->transp.length = 0;
1066 var->transp.offset = 0;
1069 var->red.offset = 10;
1070 var->green.offset = 5;
1071 var->blue.offset = 0;
1072 var->red.length = 5;
1073 var->green.length = 5;
1074 var->blue.length = 5;
1075 var->transp.length = 1;
1076 var->transp.offset = 15;
1079 var->red.offset = 11;
1080 var->green.offset = 5;
1081 var->blue.offset = 0;
1082 var->red.length = 5;
1083 var->green.length = 6;
1084 var->blue.length = 5;
1085 var->transp.length = 0;
1086 var->transp.offset = 0;
1089 var->red.offset = 16;
1090 var->green.offset = 8;
1091 var->blue.offset = 0;
1092 var->red.length = 8;
1093 var->green.length = 8;
1094 var->blue.length = 8;
1095 var->transp.length = 0;
1096 var->transp.offset = 0;
1099 var->red.offset = 16;
1100 var->green.offset = 8;
1101 var->blue.offset = 0;
1102 var->red.length = 8;
1103 var->green.length = 8;
1104 var->blue.length = 8;
1105 var->transp.length = 8;
1106 var->transp.offset = 24;
1113 EXPORT_SYMBOL(drm_fb_helper_check_var);
1116 * drm_fb_helper_set_par - implementation for ->fb_set_par
1117 * @info: fbdev registered by the helper
1119 * This will let fbcon do the mode init and is called at initialization time by
1120 * the fbdev core when registering the driver, and later on through the hotplug
1123 int drm_fb_helper_set_par(struct fb_info *info)
1125 struct drm_fb_helper *fb_helper = info->par;
1126 struct fb_var_screeninfo *var = &info->var;
1128 if (oops_in_progress)
1131 if (var->pixclock != 0) {
1132 DRM_ERROR("PIXEL CLOCK SET\n");
1136 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1140 EXPORT_SYMBOL(drm_fb_helper_set_par);
1143 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1144 * @var: updated screen information
1145 * @info: fbdev registered by the helper
1147 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1148 struct fb_info *info)
1150 struct drm_fb_helper *fb_helper = info->par;
1151 struct drm_device *dev = fb_helper->dev;
1152 struct drm_mode_set *modeset;
1156 if (oops_in_progress)
1159 drm_modeset_lock_all(dev);
1160 if (!drm_fb_helper_is_bound(fb_helper)) {
1161 drm_modeset_unlock_all(dev);
1165 for (i = 0; i < fb_helper->crtc_count; i++) {
1166 modeset = &fb_helper->crtc_info[i].mode_set;
1168 modeset->x = var->xoffset;
1169 modeset->y = var->yoffset;
1171 if (modeset->num_connectors) {
1172 ret = drm_mode_set_config_internal(modeset);
1174 info->var.xoffset = var->xoffset;
1175 info->var.yoffset = var->yoffset;
1179 drm_modeset_unlock_all(dev);
1182 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1185 * Allocates the backing storage and sets up the fbdev info structure through
1186 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1189 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1195 struct fb_info *info;
1196 struct drm_fb_helper_surface_size sizes;
1199 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1200 sizes.surface_depth = 24;
1201 sizes.surface_bpp = 32;
1202 sizes.fb_width = (unsigned)-1;
1203 sizes.fb_height = (unsigned)-1;
1205 /* if driver picks 8 or 16 by default use that
1206 for both depth/bpp */
1207 if (preferred_bpp != sizes.surface_bpp)
1208 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1210 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1211 for (i = 0; i < fb_helper->connector_count; i++) {
1212 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1213 struct drm_cmdline_mode *cmdline_mode;
1215 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1217 if (cmdline_mode->bpp_specified) {
1218 switch (cmdline_mode->bpp) {
1220 sizes.surface_depth = sizes.surface_bpp = 8;
1223 sizes.surface_depth = 15;
1224 sizes.surface_bpp = 16;
1227 sizes.surface_depth = sizes.surface_bpp = 16;
1230 sizes.surface_depth = sizes.surface_bpp = 24;
1233 sizes.surface_depth = 24;
1234 sizes.surface_bpp = 32;
1242 for (i = 0; i < fb_helper->crtc_count; i++) {
1243 struct drm_display_mode *desired_mode;
1244 struct drm_mode_set *mode_set;
1246 /* in case of tile group, are we the last tile vert or horiz?
1247 * If no tile group you are always the last one both vertically
1250 bool lastv = true, lasth = true;
1252 desired_mode = fb_helper->crtc_info[i].desired_mode;
1253 mode_set = &fb_helper->crtc_info[i].mode_set;
1260 x = fb_helper->crtc_info[i].x;
1261 y = fb_helper->crtc_info[i].y;
1263 if (gamma_size == 0)
1264 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1266 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1267 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1269 for (j = 0; j < mode_set->num_connectors; j++) {
1270 struct drm_connector *connector = mode_set->connectors[j];
1271 if (connector->has_tile) {
1272 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1273 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1274 /* cloning to multiple tiles is just crazy-talk, so: */
1280 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1282 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1285 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1286 /* hmm everyone went away - assume VGA cable just fell out
1287 and will come back later. */
1288 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1289 sizes.fb_width = sizes.surface_width = 1024;
1290 sizes.fb_height = sizes.surface_height = 768;
1293 /* push down into drivers */
1294 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1298 info = fb_helper->fbdev;
1301 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1302 * events, but at init time drm_setup_crtcs needs to be called before
1303 * the fb is allocated (since we need to figure out the desired size of
1304 * the fb before we can allocate it ...). Hence we need to fix things up
1307 for (i = 0; i < fb_helper->crtc_count; i++)
1308 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1309 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1312 info->var.pixclock = 0;
1313 if (register_framebuffer(info) < 0)
1316 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1317 info->node, info->fix.id);
1319 if (list_empty(&kernel_fb_helper_list)) {
1320 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1323 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1329 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1330 * @info: fbdev registered by the helper
1331 * @pitch: desired pitch
1332 * @depth: desired depth
1334 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1335 * fbdev emulations. Drivers which support acceleration methods which impose
1336 * additional constraints need to set up their own limits.
1338 * Drivers should call this (or their equivalent setup code) from their
1339 * ->fb_probe callback.
1341 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1344 info->fix.type = FB_TYPE_PACKED_PIXELS;
1345 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1346 FB_VISUAL_TRUECOLOR;
1347 info->fix.mmio_start = 0;
1348 info->fix.mmio_len = 0;
1349 info->fix.type_aux = 0;
1350 info->fix.xpanstep = 1; /* doing it in hw */
1351 info->fix.ypanstep = 1; /* doing it in hw */
1352 info->fix.ywrapstep = 0;
1353 info->fix.accel = FB_ACCEL_NONE;
1355 info->fix.line_length = pitch;
1358 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1361 * drm_fb_helper_fill_var - initalizes variable fbdev information
1362 * @info: fbdev instance to set up
1363 * @fb_helper: fb helper instance to use as template
1364 * @fb_width: desired fb width
1365 * @fb_height: desired fb height
1367 * Sets up the variable fbdev metainformation from the given fb helper instance
1368 * and the drm framebuffer allocated in fb_helper->fb.
1370 * Drivers should call this (or their equivalent setup code) from their
1371 * ->fb_probe callback after having allocated the fbdev backing
1372 * storage framebuffer.
1374 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1375 uint32_t fb_width, uint32_t fb_height)
1377 struct drm_framebuffer *fb = fb_helper->fb;
1378 info->pseudo_palette = fb_helper->pseudo_palette;
1379 info->var.xres_virtual = fb->width;
1380 info->var.yres_virtual = fb->height;
1381 info->var.bits_per_pixel = fb->bits_per_pixel;
1382 info->var.accel_flags = FB_ACCELF_TEXT;
1383 info->var.xoffset = 0;
1384 info->var.yoffset = 0;
1385 info->var.activate = FB_ACTIVATE_NOW;
1386 info->var.height = -1;
1387 info->var.width = -1;
1389 switch (fb->depth) {
1391 info->var.red.offset = 0;
1392 info->var.green.offset = 0;
1393 info->var.blue.offset = 0;
1394 info->var.red.length = 8; /* 8bit DAC */
1395 info->var.green.length = 8;
1396 info->var.blue.length = 8;
1397 info->var.transp.offset = 0;
1398 info->var.transp.length = 0;
1401 info->var.red.offset = 10;
1402 info->var.green.offset = 5;
1403 info->var.blue.offset = 0;
1404 info->var.red.length = 5;
1405 info->var.green.length = 5;
1406 info->var.blue.length = 5;
1407 info->var.transp.offset = 15;
1408 info->var.transp.length = 1;
1411 info->var.red.offset = 11;
1412 info->var.green.offset = 5;
1413 info->var.blue.offset = 0;
1414 info->var.red.length = 5;
1415 info->var.green.length = 6;
1416 info->var.blue.length = 5;
1417 info->var.transp.offset = 0;
1420 info->var.red.offset = 16;
1421 info->var.green.offset = 8;
1422 info->var.blue.offset = 0;
1423 info->var.red.length = 8;
1424 info->var.green.length = 8;
1425 info->var.blue.length = 8;
1426 info->var.transp.offset = 0;
1427 info->var.transp.length = 0;
1430 info->var.red.offset = 16;
1431 info->var.green.offset = 8;
1432 info->var.blue.offset = 0;
1433 info->var.red.length = 8;
1434 info->var.green.length = 8;
1435 info->var.blue.length = 8;
1436 info->var.transp.offset = 24;
1437 info->var.transp.length = 8;
1443 info->var.xres = fb_width;
1444 info->var.yres = fb_height;
1446 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1448 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1452 struct drm_connector *connector;
1456 for (i = 0; i < fb_helper->connector_count; i++) {
1457 connector = fb_helper->connector_info[i]->connector;
1458 count += connector->funcs->fill_modes(connector, maxX, maxY);
1464 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1466 struct drm_display_mode *mode;
1468 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1469 if (mode->hdisplay > width ||
1470 mode->vdisplay > height)
1472 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1477 EXPORT_SYMBOL(drm_has_preferred_mode);
1479 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1481 return fb_connector->connector->cmdline_mode.specified;
1484 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1485 int width, int height)
1487 struct drm_cmdline_mode *cmdline_mode;
1488 struct drm_display_mode *mode;
1489 bool prefer_non_interlace;
1491 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1492 if (cmdline_mode->specified == false)
1495 /* attempt to find a matching mode in the list of modes
1496 * we have gotten so far, if not add a CVT mode that conforms
1498 if (cmdline_mode->rb || cmdline_mode->margins)
1501 prefer_non_interlace = !cmdline_mode->interlace;
1503 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1504 /* check width/height */
1505 if (mode->hdisplay != cmdline_mode->xres ||
1506 mode->vdisplay != cmdline_mode->yres)
1509 if (cmdline_mode->refresh_specified) {
1510 if (mode->vrefresh != cmdline_mode->refresh)
1514 if (cmdline_mode->interlace) {
1515 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1517 } else if (prefer_non_interlace) {
1518 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1524 if (prefer_non_interlace) {
1525 prefer_non_interlace = false;
1530 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1532 list_add(&mode->head, &fb_helper_conn->connector->modes);
1535 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1537 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1542 enable = connector->status == connector_status_connected;
1544 enable = connector->status != connector_status_disconnected;
1549 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1552 bool any_enabled = false;
1553 struct drm_connector *connector;
1556 for (i = 0; i < fb_helper->connector_count; i++) {
1557 connector = fb_helper->connector_info[i]->connector;
1558 enabled[i] = drm_connector_enabled(connector, true);
1559 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1560 enabled[i] ? "yes" : "no");
1561 any_enabled |= enabled[i];
1567 for (i = 0; i < fb_helper->connector_count; i++) {
1568 connector = fb_helper->connector_info[i]->connector;
1569 enabled[i] = drm_connector_enabled(connector, false);
1573 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1574 struct drm_display_mode **modes,
1575 struct drm_fb_offset *offsets,
1576 bool *enabled, int width, int height)
1579 bool can_clone = false;
1580 struct drm_fb_helper_connector *fb_helper_conn;
1581 struct drm_display_mode *dmt_mode, *mode;
1583 /* only contemplate cloning in the single crtc case */
1584 if (fb_helper->crtc_count > 1)
1588 for (i = 0; i < fb_helper->connector_count; i++) {
1593 /* only contemplate cloning if more than one connector is enabled */
1597 /* check the command line or if nothing common pick 1024x768 */
1599 for (i = 0; i < fb_helper->connector_count; i++) {
1602 fb_helper_conn = fb_helper->connector_info[i];
1603 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1608 for (j = 0; j < i; j++) {
1611 if (!drm_mode_equal(modes[j], modes[i]))
1617 DRM_DEBUG_KMS("can clone using command line\n");
1621 /* try and find a 1024x768 mode on each connector */
1623 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1625 for (i = 0; i < fb_helper->connector_count; i++) {
1630 fb_helper_conn = fb_helper->connector_info[i];
1631 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1632 if (drm_mode_equal(mode, dmt_mode))
1640 DRM_DEBUG_KMS("can clone using 1024x768\n");
1643 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1647 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1648 struct drm_display_mode **modes,
1649 struct drm_fb_offset *offsets,
1651 int h_idx, int v_idx)
1653 struct drm_fb_helper_connector *fb_helper_conn;
1655 int hoffset = 0, voffset = 0;
1657 for (i = 0; i < fb_helper->connector_count; i++) {
1658 fb_helper_conn = fb_helper->connector_info[i];
1659 if (!fb_helper_conn->connector->has_tile)
1662 if (!modes[i] && (h_idx || v_idx)) {
1663 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1664 fb_helper_conn->connector->base.id);
1667 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1668 hoffset += modes[i]->hdisplay;
1670 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1671 voffset += modes[i]->vdisplay;
1673 offsets[idx].x = hoffset;
1674 offsets[idx].y = voffset;
1675 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1679 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1680 struct drm_display_mode **modes,
1681 struct drm_fb_offset *offsets,
1682 bool *enabled, int width, int height)
1684 struct drm_fb_helper_connector *fb_helper_conn;
1686 uint64_t conn_configured = 0, mask;
1688 mask = (1 << fb_helper->connector_count) - 1;
1690 for (i = 0; i < fb_helper->connector_count; i++) {
1691 fb_helper_conn = fb_helper->connector_info[i];
1693 if (conn_configured & (1 << i))
1696 if (enabled[i] == false) {
1697 conn_configured |= (1 << i);
1701 /* first pass over all the untiled connectors */
1702 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1705 if (tile_pass == 1) {
1706 if (fb_helper_conn->connector->tile_h_loc != 0 ||
1707 fb_helper_conn->connector->tile_v_loc != 0)
1711 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1712 fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1713 /* if this tile_pass doesn't cover any of the tiles - keep going */
1716 /* find the tile offsets for this pass - need
1717 to find all tiles left and above */
1718 drm_get_tile_offsets(fb_helper, modes, offsets,
1719 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1721 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1722 fb_helper_conn->connector->base.id);
1724 /* got for command line mode first */
1725 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1727 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1728 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1729 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1731 /* No preferred modes, pick one off the list */
1732 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1733 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1736 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1738 conn_configured |= (1 << i);
1741 if ((conn_configured & mask) != mask) {
1748 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1749 struct drm_fb_helper_crtc **best_crtcs,
1750 struct drm_display_mode **modes,
1751 int n, int width, int height)
1754 struct drm_device *dev = fb_helper->dev;
1755 struct drm_connector *connector;
1756 const struct drm_connector_helper_funcs *connector_funcs;
1757 struct drm_encoder *encoder;
1758 int my_score, best_score, score;
1759 struct drm_fb_helper_crtc **crtcs, *crtc;
1760 struct drm_fb_helper_connector *fb_helper_conn;
1762 if (n == fb_helper->connector_count)
1765 fb_helper_conn = fb_helper->connector_info[n];
1766 connector = fb_helper_conn->connector;
1768 best_crtcs[n] = NULL;
1769 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1770 if (modes[n] == NULL)
1773 crtcs = kzalloc(dev->mode_config.num_connector *
1774 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1779 if (connector->status == connector_status_connected)
1781 if (drm_has_cmdline_mode(fb_helper_conn))
1783 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1786 connector_funcs = connector->helper_private;
1787 encoder = connector_funcs->best_encoder(connector);
1791 /* select a crtc for this connector and then attempt to configure
1792 remaining connectors */
1793 for (c = 0; c < fb_helper->crtc_count; c++) {
1794 crtc = &fb_helper->crtc_info[c];
1796 if ((encoder->possible_crtcs & (1 << c)) == 0)
1799 for (o = 0; o < n; o++)
1800 if (best_crtcs[o] == crtc)
1804 /* ignore cloning unless only a single crtc */
1805 if (fb_helper->crtc_count > 1)
1808 if (!drm_mode_equal(modes[o], modes[n]))
1813 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1814 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1816 if (score > best_score) {
1818 memcpy(best_crtcs, crtcs,
1819 dev->mode_config.num_connector *
1820 sizeof(struct drm_fb_helper_crtc *));
1828 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1830 struct drm_device *dev = fb_helper->dev;
1831 struct drm_fb_helper_crtc **crtcs;
1832 struct drm_display_mode **modes;
1833 struct drm_fb_offset *offsets;
1834 struct drm_mode_set *modeset;
1839 DRM_DEBUG_KMS("\n");
1841 width = dev->mode_config.max_width;
1842 height = dev->mode_config.max_height;
1844 crtcs = kcalloc(dev->mode_config.num_connector,
1845 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1846 modes = kcalloc(dev->mode_config.num_connector,
1847 sizeof(struct drm_display_mode *), GFP_KERNEL);
1848 offsets = kcalloc(dev->mode_config.num_connector,
1849 sizeof(struct drm_fb_offset), GFP_KERNEL);
1850 enabled = kcalloc(dev->mode_config.num_connector,
1851 sizeof(bool), GFP_KERNEL);
1852 if (!crtcs || !modes || !enabled || !offsets) {
1853 DRM_ERROR("Memory allocation failed\n");
1858 drm_enable_connectors(fb_helper, enabled);
1860 if (!(fb_helper->funcs->initial_config &&
1861 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1863 enabled, width, height))) {
1864 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1865 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1866 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1868 if (!drm_target_cloned(fb_helper, modes, offsets,
1869 enabled, width, height) &&
1870 !drm_target_preferred(fb_helper, modes, offsets,
1871 enabled, width, height))
1872 DRM_ERROR("Unable to find initial modes\n");
1874 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1877 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1880 /* need to set the modesets up here for use later */
1881 /* fill out the connector<->crtc mappings into the modesets */
1882 for (i = 0; i < fb_helper->crtc_count; i++) {
1883 modeset = &fb_helper->crtc_info[i].mode_set;
1884 modeset->num_connectors = 0;
1888 for (i = 0; i < fb_helper->connector_count; i++) {
1889 struct drm_display_mode *mode = modes[i];
1890 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1891 struct drm_fb_offset *offset = &offsets[i];
1892 modeset = &fb_crtc->mode_set;
1894 if (mode && fb_crtc) {
1895 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1896 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1897 fb_crtc->desired_mode = mode;
1898 fb_crtc->x = offset->x;
1899 fb_crtc->y = offset->y;
1901 drm_mode_destroy(dev, modeset->mode);
1902 modeset->mode = drm_mode_duplicate(dev,
1903 fb_crtc->desired_mode);
1904 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1905 modeset->fb = fb_helper->fb;
1906 modeset->x = offset->x;
1907 modeset->y = offset->y;
1911 /* Clear out any old modes if there are no more connected outputs. */
1912 for (i = 0; i < fb_helper->crtc_count; i++) {
1913 modeset = &fb_helper->crtc_info[i].mode_set;
1914 if (modeset->num_connectors == 0) {
1915 BUG_ON(modeset->fb);
1917 drm_mode_destroy(dev, modeset->mode);
1918 modeset->mode = NULL;
1929 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1930 * @fb_helper: fb_helper device struct
1931 * @bpp_sel: bpp value to use for the framebuffer configuration
1933 * Scans the CRTCs and connectors and tries to put together an initial setup.
1934 * At the moment, this is a cloned configuration across all heads with
1935 * a new framebuffer object as the backing store.
1937 * Note that this also registers the fbdev and so allows userspace to call into
1938 * the driver through the fbdev interfaces.
1940 * This function will call down into the ->fb_probe callback to let
1941 * the driver allocate and initialize the fbdev info structure and the drm
1942 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1943 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1944 * values for the fbdev info structure.
1947 * Zero if everything went ok, nonzero otherwise.
1949 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1951 struct drm_device *dev = fb_helper->dev;
1954 mutex_lock(&dev->mode_config.mutex);
1955 count = drm_fb_helper_probe_connector_modes(fb_helper,
1956 dev->mode_config.max_width,
1957 dev->mode_config.max_height);
1958 mutex_unlock(&dev->mode_config.mutex);
1960 * we shouldn't end up with no modes here.
1963 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1965 drm_setup_crtcs(fb_helper);
1967 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1969 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1972 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1973 * probing all the outputs attached to the fb
1974 * @fb_helper: the drm_fb_helper
1976 * Scan the connectors attached to the fb_helper and try to put together a
1977 * setup after *notification of a change in output configuration.
1979 * Called at runtime, takes the mode config locks to be able to check/change the
1980 * modeset configuration. Must be run from process context (which usually means
1981 * either the output polling work or a work item launched from the driver's
1982 * hotplug interrupt).
1984 * Note that drivers may call this even before calling
1985 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1986 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1987 * not miss any hotplug events.
1990 * 0 on success and a non-zero error code otherwise.
1992 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1994 struct drm_device *dev = fb_helper->dev;
1995 u32 max_width, max_height;
1997 mutex_lock(&fb_helper->dev->mode_config.mutex);
1998 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1999 fb_helper->delayed_hotplug = true;
2000 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2003 DRM_DEBUG_KMS("\n");
2005 max_width = fb_helper->fb->width;
2006 max_height = fb_helper->fb->height;
2008 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2009 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2011 drm_modeset_lock_all(dev);
2012 drm_setup_crtcs(fb_helper);
2013 drm_modeset_unlock_all(dev);
2014 drm_fb_helper_set_par(fb_helper->fbdev);
2018 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2020 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2021 * but the module doesn't depend on any fb console symbols. At least
2022 * attempt to load fbcon to avoid leaving the system without a usable console.
2024 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2025 static int __init drm_fb_helper_modinit(void)
2027 const char *name = "fbcon";
2028 struct module *fbcon;
2030 mutex_lock(&module_mutex);
2031 fbcon = find_module(name);
2032 mutex_unlock(&module_mutex);
2035 request_module_nowait(name);
2039 module_init(drm_fb_helper_modinit);