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 * fbdev->blank can be called from irq context in case of a panic.
495 * Since we already have our own special panic handler which will
496 * restore the fbdev console mode completely, just bail out early.
498 if (oops_in_progress)
502 * For each CRTC in this fb, turn the connectors on/off.
504 drm_modeset_lock_all(dev);
505 if (!drm_fb_helper_is_bound(fb_helper)) {
506 drm_modeset_unlock_all(dev);
510 for (i = 0; i < fb_helper->crtc_count; i++) {
511 crtc = fb_helper->crtc_info[i].mode_set.crtc;
516 /* Walk the connectors & encoders on this fb turning them on/off */
517 for (j = 0; j < fb_helper->connector_count; j++) {
518 connector = fb_helper->connector_info[j]->connector;
519 connector->funcs->dpms(connector, dpms_mode);
520 drm_object_property_set_value(&connector->base,
521 dev->mode_config.dpms_property, dpms_mode);
524 drm_modeset_unlock_all(dev);
528 * drm_fb_helper_blank - implementation for ->fb_blank
529 * @blank: desired blanking state
530 * @info: fbdev registered by the helper
532 int drm_fb_helper_blank(int blank, struct fb_info *info)
535 /* Display: On; HSync: On, VSync: On */
536 case FB_BLANK_UNBLANK:
537 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
539 /* Display: Off; HSync: On, VSync: On */
540 case FB_BLANK_NORMAL:
541 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
543 /* Display: Off; HSync: Off, VSync: On */
544 case FB_BLANK_HSYNC_SUSPEND:
545 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
547 /* Display: Off; HSync: On, VSync: Off */
548 case FB_BLANK_VSYNC_SUSPEND:
549 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
551 /* Display: Off; HSync: Off, VSync: Off */
552 case FB_BLANK_POWERDOWN:
553 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
558 EXPORT_SYMBOL(drm_fb_helper_blank);
560 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
564 for (i = 0; i < helper->connector_count; i++)
565 kfree(helper->connector_info[i]);
566 kfree(helper->connector_info);
567 for (i = 0; i < helper->crtc_count; i++) {
568 kfree(helper->crtc_info[i].mode_set.connectors);
569 if (helper->crtc_info[i].mode_set.mode)
570 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
572 kfree(helper->crtc_info);
576 * drm_fb_helper_prepare - setup a drm_fb_helper structure
578 * @helper: driver-allocated fbdev helper structure to set up
579 * @funcs: pointer to structure of functions associate with this helper
581 * Sets up the bare minimum to make the framebuffer helper usable. This is
582 * useful to implement race-free initialization of the polling helpers.
584 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
585 const struct drm_fb_helper_funcs *funcs)
587 INIT_LIST_HEAD(&helper->kernel_fb_list);
588 helper->funcs = funcs;
591 EXPORT_SYMBOL(drm_fb_helper_prepare);
594 * drm_fb_helper_init - initialize a drm_fb_helper structure
596 * @fb_helper: driver-allocated fbdev helper structure to initialize
597 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
598 * @max_conn_count: max connector count
600 * This allocates the structures for the fbdev helper with the given limits.
601 * Note that this won't yet touch the hardware (through the driver interfaces)
602 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
603 * to allow driver writes more control over the exact init sequence.
605 * Drivers must call drm_fb_helper_prepare() before calling this function.
608 * Zero if everything went ok, nonzero otherwise.
610 int drm_fb_helper_init(struct drm_device *dev,
611 struct drm_fb_helper *fb_helper,
612 int crtc_count, int max_conn_count)
614 struct drm_crtc *crtc;
620 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
621 if (!fb_helper->crtc_info)
624 fb_helper->crtc_count = crtc_count;
625 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
626 if (!fb_helper->connector_info) {
627 kfree(fb_helper->crtc_info);
630 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
631 fb_helper->connector_count = 0;
633 for (i = 0; i < crtc_count; i++) {
634 fb_helper->crtc_info[i].mode_set.connectors =
635 kcalloc(max_conn_count,
636 sizeof(struct drm_connector *),
639 if (!fb_helper->crtc_info[i].mode_set.connectors)
641 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
645 drm_for_each_crtc(crtc, dev) {
646 fb_helper->crtc_info[i].mode_set.crtc = crtc;
652 drm_fb_helper_crtc_free(fb_helper);
655 EXPORT_SYMBOL(drm_fb_helper_init);
658 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
659 * @fb_helper: driver-allocated fbdev helper
661 * A helper to alloc fb_info and the members cmap and apertures. Called
662 * by the driver within the fb_probe fb_helper callback function.
665 * fb_info pointer if things went okay, pointer containing error code
668 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
670 struct device *dev = fb_helper->dev->dev;
671 struct fb_info *info;
674 info = framebuffer_alloc(0, dev);
676 return ERR_PTR(-ENOMEM);
678 ret = fb_alloc_cmap(&info->cmap, 256, 0);
682 info->apertures = alloc_apertures(1);
683 if (!info->apertures) {
688 fb_helper->fbdev = info;
693 fb_dealloc_cmap(&info->cmap);
695 framebuffer_release(info);
698 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
701 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
702 * @fb_helper: driver-allocated fbdev helper
704 * A wrapper around unregister_framebuffer, to release the fb_info
707 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
709 if (fb_helper && fb_helper->fbdev)
710 unregister_framebuffer(fb_helper->fbdev);
712 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
715 * drm_fb_helper_release_fbi - dealloc fb_info and its members
716 * @fb_helper: driver-allocated fbdev helper
718 * A helper to free memory taken by fb_info and the members cmap and
721 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
724 struct fb_info *info = fb_helper->fbdev;
728 fb_dealloc_cmap(&info->cmap);
729 framebuffer_release(info);
732 fb_helper->fbdev = NULL;
735 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
737 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
739 if (!list_empty(&fb_helper->kernel_fb_list)) {
740 list_del(&fb_helper->kernel_fb_list);
741 if (list_empty(&kernel_fb_helper_list)) {
742 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
746 drm_fb_helper_crtc_free(fb_helper);
749 EXPORT_SYMBOL(drm_fb_helper_fini);
752 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
753 * @fb_helper: driver-allocated fbdev helper
755 * A wrapper around unlink_framebuffer implemented by fbdev core
757 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
759 if (fb_helper && fb_helper->fbdev)
760 unlink_framebuffer(fb_helper->fbdev);
762 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
764 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
765 u16 blue, u16 regno, struct fb_info *info)
767 struct drm_fb_helper *fb_helper = info->par;
768 struct drm_framebuffer *fb = fb_helper->fb;
771 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
774 /* place color in psuedopalette */
777 palette = (u32 *)info->pseudo_palette;
778 red >>= (16 - info->var.red.length);
779 green >>= (16 - info->var.green.length);
780 blue >>= (16 - info->var.blue.length);
781 value = (red << info->var.red.offset) |
782 (green << info->var.green.offset) |
783 (blue << info->var.blue.offset);
784 if (info->var.transp.length > 0) {
785 u32 mask = (1 << info->var.transp.length) - 1;
786 mask <<= info->var.transp.offset;
789 palette[regno] = value;
794 * The driver really shouldn't advertise pseudo/directcolor
795 * visuals if it can't deal with the palette.
797 if (WARN_ON(!fb_helper->funcs->gamma_set ||
798 !fb_helper->funcs->gamma_get))
803 if (fb->bits_per_pixel == 16) {
806 if (fb->depth == 16 && regno > 63)
808 if (fb->depth == 15 && regno > 31)
811 if (fb->depth == 16) {
815 for (i = 0; i < 8; i++)
816 fb_helper->funcs->gamma_set(crtc, red,
817 green, blue, pindex + i);
820 fb_helper->funcs->gamma_get(crtc, &r,
824 for (i = 0; i < 4; i++)
825 fb_helper->funcs->gamma_set(crtc, r,
832 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
837 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
839 * @info: fbdev registered by the helper
841 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
843 struct drm_fb_helper *fb_helper = info->par;
844 struct drm_device *dev = fb_helper->dev;
845 const struct drm_crtc_helper_funcs *crtc_funcs;
846 u16 *red, *green, *blue, *transp;
847 struct drm_crtc *crtc;
851 if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
854 if (!drm_fb_helper_is_bound(fb_helper)) {
855 drm_modeset_unlock_all(dev);
859 for (i = 0; i < fb_helper->crtc_count; i++) {
860 crtc = fb_helper->crtc_info[i].mode_set.crtc;
861 crtc_funcs = crtc->helper_private;
866 transp = cmap->transp;
869 for (j = 0; j < cmap->len; j++) {
870 u16 hred, hgreen, hblue, htransp = 0xffff;
879 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
883 if (crtc_funcs->load_lut)
884 crtc_funcs->load_lut(crtc);
887 drm_modeset_unlock_all(dev);
890 EXPORT_SYMBOL(drm_fb_helper_setcmap);
893 * drm_fb_helper_check_var - implementation for ->fb_check_var
894 * @var: screeninfo to check
895 * @info: fbdev registered by the helper
897 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
898 struct fb_info *info)
900 struct drm_fb_helper *fb_helper = info->par;
901 struct drm_framebuffer *fb = fb_helper->fb;
904 if (var->pixclock != 0 || in_dbg_master())
907 /* Need to resize the fb object !!! */
908 if (var->bits_per_pixel > fb->bits_per_pixel ||
909 var->xres > fb->width || var->yres > fb->height ||
910 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
911 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
912 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
913 var->xres, var->yres, var->bits_per_pixel,
914 var->xres_virtual, var->yres_virtual,
915 fb->width, fb->height, fb->bits_per_pixel);
919 switch (var->bits_per_pixel) {
921 depth = (var->green.length == 6) ? 16 : 15;
924 depth = (var->transp.length > 0) ? 32 : 24;
927 depth = var->bits_per_pixel;
934 var->green.offset = 0;
935 var->blue.offset = 0;
937 var->green.length = 8;
938 var->blue.length = 8;
939 var->transp.length = 0;
940 var->transp.offset = 0;
943 var->red.offset = 10;
944 var->green.offset = 5;
945 var->blue.offset = 0;
947 var->green.length = 5;
948 var->blue.length = 5;
949 var->transp.length = 1;
950 var->transp.offset = 15;
953 var->red.offset = 11;
954 var->green.offset = 5;
955 var->blue.offset = 0;
957 var->green.length = 6;
958 var->blue.length = 5;
959 var->transp.length = 0;
960 var->transp.offset = 0;
963 var->red.offset = 16;
964 var->green.offset = 8;
965 var->blue.offset = 0;
967 var->green.length = 8;
968 var->blue.length = 8;
969 var->transp.length = 0;
970 var->transp.offset = 0;
973 var->red.offset = 16;
974 var->green.offset = 8;
975 var->blue.offset = 0;
977 var->green.length = 8;
978 var->blue.length = 8;
979 var->transp.length = 8;
980 var->transp.offset = 24;
987 EXPORT_SYMBOL(drm_fb_helper_check_var);
990 * drm_fb_helper_set_par - implementation for ->fb_set_par
991 * @info: fbdev registered by the helper
993 * This will let fbcon do the mode init and is called at initialization time by
994 * the fbdev core when registering the driver, and later on through the hotplug
997 int drm_fb_helper_set_par(struct fb_info *info)
999 struct drm_fb_helper *fb_helper = info->par;
1000 struct fb_var_screeninfo *var = &info->var;
1002 if (var->pixclock != 0) {
1003 DRM_ERROR("PIXEL CLOCK SET\n");
1007 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1011 EXPORT_SYMBOL(drm_fb_helper_set_par);
1014 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1015 * @var: updated screen information
1016 * @info: fbdev registered by the helper
1018 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1019 struct fb_info *info)
1021 struct drm_fb_helper *fb_helper = info->par;
1022 struct drm_device *dev = fb_helper->dev;
1023 struct drm_mode_set *modeset;
1027 if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
1030 if (!drm_fb_helper_is_bound(fb_helper)) {
1031 drm_modeset_unlock_all(dev);
1035 for (i = 0; i < fb_helper->crtc_count; i++) {
1036 modeset = &fb_helper->crtc_info[i].mode_set;
1038 modeset->x = var->xoffset;
1039 modeset->y = var->yoffset;
1041 if (modeset->num_connectors) {
1042 ret = drm_mode_set_config_internal(modeset);
1044 info->var.xoffset = var->xoffset;
1045 info->var.yoffset = var->yoffset;
1049 drm_modeset_unlock_all(dev);
1052 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1055 * Allocates the backing storage and sets up the fbdev info structure through
1056 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1059 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1065 struct fb_info *info;
1066 struct drm_fb_helper_surface_size sizes;
1069 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1070 sizes.surface_depth = 24;
1071 sizes.surface_bpp = 32;
1072 sizes.fb_width = (unsigned)-1;
1073 sizes.fb_height = (unsigned)-1;
1075 /* if driver picks 8 or 16 by default use that
1076 for both depth/bpp */
1077 if (preferred_bpp != sizes.surface_bpp)
1078 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1080 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1081 for (i = 0; i < fb_helper->connector_count; i++) {
1082 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1083 struct drm_cmdline_mode *cmdline_mode;
1085 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1087 if (cmdline_mode->bpp_specified) {
1088 switch (cmdline_mode->bpp) {
1090 sizes.surface_depth = sizes.surface_bpp = 8;
1093 sizes.surface_depth = 15;
1094 sizes.surface_bpp = 16;
1097 sizes.surface_depth = sizes.surface_bpp = 16;
1100 sizes.surface_depth = sizes.surface_bpp = 24;
1103 sizes.surface_depth = 24;
1104 sizes.surface_bpp = 32;
1112 for (i = 0; i < fb_helper->crtc_count; i++) {
1113 struct drm_display_mode *desired_mode;
1114 struct drm_mode_set *mode_set;
1116 /* in case of tile group, are we the last tile vert or horiz?
1117 * If no tile group you are always the last one both vertically
1120 bool lastv = true, lasth = true;
1122 desired_mode = fb_helper->crtc_info[i].desired_mode;
1123 mode_set = &fb_helper->crtc_info[i].mode_set;
1130 x = fb_helper->crtc_info[i].x;
1131 y = fb_helper->crtc_info[i].y;
1133 if (gamma_size == 0)
1134 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1136 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1137 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1139 for (j = 0; j < mode_set->num_connectors; j++) {
1140 struct drm_connector *connector = mode_set->connectors[j];
1141 if (connector->has_tile) {
1142 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1143 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1144 /* cloning to multiple tiles is just crazy-talk, so: */
1150 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1152 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1155 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1156 /* hmm everyone went away - assume VGA cable just fell out
1157 and will come back later. */
1158 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1159 sizes.fb_width = sizes.surface_width = 1024;
1160 sizes.fb_height = sizes.surface_height = 768;
1163 /* push down into drivers */
1164 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1168 info = fb_helper->fbdev;
1171 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1172 * events, but at init time drm_setup_crtcs needs to be called before
1173 * the fb is allocated (since we need to figure out the desired size of
1174 * the fb before we can allocate it ...). Hence we need to fix things up
1177 for (i = 0; i < fb_helper->crtc_count; i++)
1178 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1179 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1182 info->var.pixclock = 0;
1183 if (register_framebuffer(info) < 0)
1186 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1187 info->node, info->fix.id);
1189 if (list_empty(&kernel_fb_helper_list)) {
1190 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1193 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1199 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1200 * @info: fbdev registered by the helper
1201 * @pitch: desired pitch
1202 * @depth: desired depth
1204 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1205 * fbdev emulations. Drivers which support acceleration methods which impose
1206 * additional constraints need to set up their own limits.
1208 * Drivers should call this (or their equivalent setup code) from their
1209 * ->fb_probe callback.
1211 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1214 info->fix.type = FB_TYPE_PACKED_PIXELS;
1215 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1216 FB_VISUAL_TRUECOLOR;
1217 info->fix.mmio_start = 0;
1218 info->fix.mmio_len = 0;
1219 info->fix.type_aux = 0;
1220 info->fix.xpanstep = 1; /* doing it in hw */
1221 info->fix.ypanstep = 1; /* doing it in hw */
1222 info->fix.ywrapstep = 0;
1223 info->fix.accel = FB_ACCEL_NONE;
1225 info->fix.line_length = pitch;
1228 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1231 * drm_fb_helper_fill_var - initalizes variable fbdev information
1232 * @info: fbdev instance to set up
1233 * @fb_helper: fb helper instance to use as template
1234 * @fb_width: desired fb width
1235 * @fb_height: desired fb height
1237 * Sets up the variable fbdev metainformation from the given fb helper instance
1238 * and the drm framebuffer allocated in fb_helper->fb.
1240 * Drivers should call this (or their equivalent setup code) from their
1241 * ->fb_probe callback after having allocated the fbdev backing
1242 * storage framebuffer.
1244 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1245 uint32_t fb_width, uint32_t fb_height)
1247 struct drm_framebuffer *fb = fb_helper->fb;
1248 info->pseudo_palette = fb_helper->pseudo_palette;
1249 info->var.xres_virtual = fb->width;
1250 info->var.yres_virtual = fb->height;
1251 info->var.bits_per_pixel = fb->bits_per_pixel;
1252 info->var.accel_flags = FB_ACCELF_TEXT;
1253 info->var.xoffset = 0;
1254 info->var.yoffset = 0;
1255 info->var.activate = FB_ACTIVATE_NOW;
1256 info->var.height = -1;
1257 info->var.width = -1;
1259 switch (fb->depth) {
1261 info->var.red.offset = 0;
1262 info->var.green.offset = 0;
1263 info->var.blue.offset = 0;
1264 info->var.red.length = 8; /* 8bit DAC */
1265 info->var.green.length = 8;
1266 info->var.blue.length = 8;
1267 info->var.transp.offset = 0;
1268 info->var.transp.length = 0;
1271 info->var.red.offset = 10;
1272 info->var.green.offset = 5;
1273 info->var.blue.offset = 0;
1274 info->var.red.length = 5;
1275 info->var.green.length = 5;
1276 info->var.blue.length = 5;
1277 info->var.transp.offset = 15;
1278 info->var.transp.length = 1;
1281 info->var.red.offset = 11;
1282 info->var.green.offset = 5;
1283 info->var.blue.offset = 0;
1284 info->var.red.length = 5;
1285 info->var.green.length = 6;
1286 info->var.blue.length = 5;
1287 info->var.transp.offset = 0;
1290 info->var.red.offset = 16;
1291 info->var.green.offset = 8;
1292 info->var.blue.offset = 0;
1293 info->var.red.length = 8;
1294 info->var.green.length = 8;
1295 info->var.blue.length = 8;
1296 info->var.transp.offset = 0;
1297 info->var.transp.length = 0;
1300 info->var.red.offset = 16;
1301 info->var.green.offset = 8;
1302 info->var.blue.offset = 0;
1303 info->var.red.length = 8;
1304 info->var.green.length = 8;
1305 info->var.blue.length = 8;
1306 info->var.transp.offset = 24;
1307 info->var.transp.length = 8;
1313 info->var.xres = fb_width;
1314 info->var.yres = fb_height;
1316 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1318 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1322 struct drm_connector *connector;
1326 for (i = 0; i < fb_helper->connector_count; i++) {
1327 connector = fb_helper->connector_info[i]->connector;
1328 count += connector->funcs->fill_modes(connector, maxX, maxY);
1334 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1336 struct drm_display_mode *mode;
1338 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1339 if (mode->hdisplay > width ||
1340 mode->vdisplay > height)
1342 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1347 EXPORT_SYMBOL(drm_has_preferred_mode);
1349 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1351 return fb_connector->connector->cmdline_mode.specified;
1354 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1355 int width, int height)
1357 struct drm_cmdline_mode *cmdline_mode;
1358 struct drm_display_mode *mode;
1359 bool prefer_non_interlace;
1361 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1362 if (cmdline_mode->specified == false)
1365 /* attempt to find a matching mode in the list of modes
1366 * we have gotten so far, if not add a CVT mode that conforms
1368 if (cmdline_mode->rb || cmdline_mode->margins)
1371 prefer_non_interlace = !cmdline_mode->interlace;
1373 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1374 /* check width/height */
1375 if (mode->hdisplay != cmdline_mode->xres ||
1376 mode->vdisplay != cmdline_mode->yres)
1379 if (cmdline_mode->refresh_specified) {
1380 if (mode->vrefresh != cmdline_mode->refresh)
1384 if (cmdline_mode->interlace) {
1385 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1387 } else if (prefer_non_interlace) {
1388 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1394 if (prefer_non_interlace) {
1395 prefer_non_interlace = false;
1400 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1402 list_add(&mode->head, &fb_helper_conn->connector->modes);
1405 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1407 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1412 enable = connector->status == connector_status_connected;
1414 enable = connector->status != connector_status_disconnected;
1419 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1422 bool any_enabled = false;
1423 struct drm_connector *connector;
1426 for (i = 0; i < fb_helper->connector_count; i++) {
1427 connector = fb_helper->connector_info[i]->connector;
1428 enabled[i] = drm_connector_enabled(connector, true);
1429 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1430 enabled[i] ? "yes" : "no");
1431 any_enabled |= enabled[i];
1437 for (i = 0; i < fb_helper->connector_count; i++) {
1438 connector = fb_helper->connector_info[i]->connector;
1439 enabled[i] = drm_connector_enabled(connector, false);
1443 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1444 struct drm_display_mode **modes,
1445 struct drm_fb_offset *offsets,
1446 bool *enabled, int width, int height)
1449 bool can_clone = false;
1450 struct drm_fb_helper_connector *fb_helper_conn;
1451 struct drm_display_mode *dmt_mode, *mode;
1453 /* only contemplate cloning in the single crtc case */
1454 if (fb_helper->crtc_count > 1)
1458 for (i = 0; i < fb_helper->connector_count; i++) {
1463 /* only contemplate cloning if more than one connector is enabled */
1467 /* check the command line or if nothing common pick 1024x768 */
1469 for (i = 0; i < fb_helper->connector_count; i++) {
1472 fb_helper_conn = fb_helper->connector_info[i];
1473 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1478 for (j = 0; j < i; j++) {
1481 if (!drm_mode_equal(modes[j], modes[i]))
1487 DRM_DEBUG_KMS("can clone using command line\n");
1491 /* try and find a 1024x768 mode on each connector */
1493 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1495 for (i = 0; i < fb_helper->connector_count; i++) {
1500 fb_helper_conn = fb_helper->connector_info[i];
1501 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1502 if (drm_mode_equal(mode, dmt_mode))
1510 DRM_DEBUG_KMS("can clone using 1024x768\n");
1513 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1517 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1518 struct drm_display_mode **modes,
1519 struct drm_fb_offset *offsets,
1521 int h_idx, int v_idx)
1523 struct drm_fb_helper_connector *fb_helper_conn;
1525 int hoffset = 0, voffset = 0;
1527 for (i = 0; i < fb_helper->connector_count; i++) {
1528 fb_helper_conn = fb_helper->connector_info[i];
1529 if (!fb_helper_conn->connector->has_tile)
1532 if (!modes[i] && (h_idx || v_idx)) {
1533 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1534 fb_helper_conn->connector->base.id);
1537 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1538 hoffset += modes[i]->hdisplay;
1540 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1541 voffset += modes[i]->vdisplay;
1543 offsets[idx].x = hoffset;
1544 offsets[idx].y = voffset;
1545 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1549 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1550 struct drm_display_mode **modes,
1551 struct drm_fb_offset *offsets,
1552 bool *enabled, int width, int height)
1554 struct drm_fb_helper_connector *fb_helper_conn;
1556 uint64_t conn_configured = 0, mask;
1558 mask = (1 << fb_helper->connector_count) - 1;
1560 for (i = 0; i < fb_helper->connector_count; i++) {
1561 fb_helper_conn = fb_helper->connector_info[i];
1563 if (conn_configured & (1 << i))
1566 if (enabled[i] == false) {
1567 conn_configured |= (1 << i);
1571 /* first pass over all the untiled connectors */
1572 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1575 if (tile_pass == 1) {
1576 if (fb_helper_conn->connector->tile_h_loc != 0 ||
1577 fb_helper_conn->connector->tile_v_loc != 0)
1581 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1582 fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1583 /* if this tile_pass doesn't cover any of the tiles - keep going */
1586 /* find the tile offsets for this pass - need
1587 to find all tiles left and above */
1588 drm_get_tile_offsets(fb_helper, modes, offsets,
1589 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1591 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1592 fb_helper_conn->connector->base.id);
1594 /* got for command line mode first */
1595 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1597 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1598 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1599 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1601 /* No preferred modes, pick one off the list */
1602 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1603 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1606 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1608 conn_configured |= (1 << i);
1611 if ((conn_configured & mask) != mask) {
1618 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1619 struct drm_fb_helper_crtc **best_crtcs,
1620 struct drm_display_mode **modes,
1621 int n, int width, int height)
1624 struct drm_device *dev = fb_helper->dev;
1625 struct drm_connector *connector;
1626 const struct drm_connector_helper_funcs *connector_funcs;
1627 struct drm_encoder *encoder;
1628 int my_score, best_score, score;
1629 struct drm_fb_helper_crtc **crtcs, *crtc;
1630 struct drm_fb_helper_connector *fb_helper_conn;
1632 if (n == fb_helper->connector_count)
1635 fb_helper_conn = fb_helper->connector_info[n];
1636 connector = fb_helper_conn->connector;
1638 best_crtcs[n] = NULL;
1639 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1640 if (modes[n] == NULL)
1643 crtcs = kzalloc(dev->mode_config.num_connector *
1644 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1649 if (connector->status == connector_status_connected)
1651 if (drm_has_cmdline_mode(fb_helper_conn))
1653 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1656 connector_funcs = connector->helper_private;
1657 encoder = connector_funcs->best_encoder(connector);
1661 /* select a crtc for this connector and then attempt to configure
1662 remaining connectors */
1663 for (c = 0; c < fb_helper->crtc_count; c++) {
1664 crtc = &fb_helper->crtc_info[c];
1666 if ((encoder->possible_crtcs & (1 << c)) == 0)
1669 for (o = 0; o < n; o++)
1670 if (best_crtcs[o] == crtc)
1674 /* ignore cloning unless only a single crtc */
1675 if (fb_helper->crtc_count > 1)
1678 if (!drm_mode_equal(modes[o], modes[n]))
1683 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1684 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1686 if (score > best_score) {
1688 memcpy(best_crtcs, crtcs,
1689 dev->mode_config.num_connector *
1690 sizeof(struct drm_fb_helper_crtc *));
1698 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1700 struct drm_device *dev = fb_helper->dev;
1701 struct drm_fb_helper_crtc **crtcs;
1702 struct drm_display_mode **modes;
1703 struct drm_fb_offset *offsets;
1704 struct drm_mode_set *modeset;
1709 DRM_DEBUG_KMS("\n");
1711 width = dev->mode_config.max_width;
1712 height = dev->mode_config.max_height;
1714 crtcs = kcalloc(dev->mode_config.num_connector,
1715 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1716 modes = kcalloc(dev->mode_config.num_connector,
1717 sizeof(struct drm_display_mode *), GFP_KERNEL);
1718 offsets = kcalloc(dev->mode_config.num_connector,
1719 sizeof(struct drm_fb_offset), GFP_KERNEL);
1720 enabled = kcalloc(dev->mode_config.num_connector,
1721 sizeof(bool), GFP_KERNEL);
1722 if (!crtcs || !modes || !enabled || !offsets) {
1723 DRM_ERROR("Memory allocation failed\n");
1728 drm_enable_connectors(fb_helper, enabled);
1730 if (!(fb_helper->funcs->initial_config &&
1731 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1733 enabled, width, height))) {
1734 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1735 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1736 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1738 if (!drm_target_cloned(fb_helper, modes, offsets,
1739 enabled, width, height) &&
1740 !drm_target_preferred(fb_helper, modes, offsets,
1741 enabled, width, height))
1742 DRM_ERROR("Unable to find initial modes\n");
1744 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1747 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1750 /* need to set the modesets up here for use later */
1751 /* fill out the connector<->crtc mappings into the modesets */
1752 for (i = 0; i < fb_helper->crtc_count; i++) {
1753 modeset = &fb_helper->crtc_info[i].mode_set;
1754 modeset->num_connectors = 0;
1758 for (i = 0; i < fb_helper->connector_count; i++) {
1759 struct drm_display_mode *mode = modes[i];
1760 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1761 struct drm_fb_offset *offset = &offsets[i];
1762 modeset = &fb_crtc->mode_set;
1764 if (mode && fb_crtc) {
1765 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1766 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1767 fb_crtc->desired_mode = mode;
1768 fb_crtc->x = offset->x;
1769 fb_crtc->y = offset->y;
1771 drm_mode_destroy(dev, modeset->mode);
1772 modeset->mode = drm_mode_duplicate(dev,
1773 fb_crtc->desired_mode);
1774 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1775 modeset->fb = fb_helper->fb;
1776 modeset->x = offset->x;
1777 modeset->y = offset->y;
1781 /* Clear out any old modes if there are no more connected outputs. */
1782 for (i = 0; i < fb_helper->crtc_count; i++) {
1783 modeset = &fb_helper->crtc_info[i].mode_set;
1784 if (modeset->num_connectors == 0) {
1785 BUG_ON(modeset->fb);
1787 drm_mode_destroy(dev, modeset->mode);
1788 modeset->mode = NULL;
1799 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1800 * @fb_helper: fb_helper device struct
1801 * @bpp_sel: bpp value to use for the framebuffer configuration
1803 * Scans the CRTCs and connectors and tries to put together an initial setup.
1804 * At the moment, this is a cloned configuration across all heads with
1805 * a new framebuffer object as the backing store.
1807 * Note that this also registers the fbdev and so allows userspace to call into
1808 * the driver through the fbdev interfaces.
1810 * This function will call down into the ->fb_probe callback to let
1811 * the driver allocate and initialize the fbdev info structure and the drm
1812 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1813 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1814 * values for the fbdev info structure.
1817 * Zero if everything went ok, nonzero otherwise.
1819 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1821 struct drm_device *dev = fb_helper->dev;
1824 mutex_lock(&dev->mode_config.mutex);
1825 count = drm_fb_helper_probe_connector_modes(fb_helper,
1826 dev->mode_config.max_width,
1827 dev->mode_config.max_height);
1828 mutex_unlock(&dev->mode_config.mutex);
1830 * we shouldn't end up with no modes here.
1833 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1835 drm_setup_crtcs(fb_helper);
1837 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1839 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1842 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1843 * probing all the outputs attached to the fb
1844 * @fb_helper: the drm_fb_helper
1846 * Scan the connectors attached to the fb_helper and try to put together a
1847 * setup after *notification of a change in output configuration.
1849 * Called at runtime, takes the mode config locks to be able to check/change the
1850 * modeset configuration. Must be run from process context (which usually means
1851 * either the output polling work or a work item launched from the driver's
1852 * hotplug interrupt).
1854 * Note that drivers may call this even before calling
1855 * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1856 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1857 * not miss any hotplug events.
1860 * 0 on success and a non-zero error code otherwise.
1862 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1864 struct drm_device *dev = fb_helper->dev;
1865 u32 max_width, max_height;
1867 mutex_lock(&fb_helper->dev->mode_config.mutex);
1868 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1869 fb_helper->delayed_hotplug = true;
1870 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1873 DRM_DEBUG_KMS("\n");
1875 max_width = fb_helper->fb->width;
1876 max_height = fb_helper->fb->height;
1878 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1879 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1881 drm_modeset_lock_all(dev);
1882 drm_setup_crtcs(fb_helper);
1883 drm_modeset_unlock_all(dev);
1884 drm_fb_helper_set_par(fb_helper->fbdev);
1888 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1890 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1891 * but the module doesn't depend on any fb console symbols. At least
1892 * attempt to load fbcon to avoid leaving the system without a usable console.
1894 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1895 static int __init drm_fb_helper_modinit(void)
1897 const char *name = "fbcon";
1898 struct module *fbcon;
1900 mutex_lock(&module_mutex);
1901 fbcon = find_module(name);
1902 mutex_unlock(&module_mutex);
1905 request_module_nowait(name);
1909 module_init(drm_fb_helper_modinit);