rcutorture: Eliminate unused ts_rem local from rcu_trace_clock_local()
[linux/fpc-iii.git] / drivers / gpu / drm / drm_fb_helper.c
blob574af01d3ce94a1cc266d32e3128ab0d0e96c3d6
1 /*
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
24 * OF THIS SOFTWARE.
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/console.h>
33 #include <linux/kernel.h>
34 #include <linux/sysrq.h>
35 #include <linux/slab.h>
36 #include <linux/module.h>
37 #include <drm/drmP.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
41 #include <drm/drm_atomic.h>
42 #include <drm/drm_atomic_helper.h>
44 #include "drm_crtc_helper_internal.h"
46 static bool drm_fbdev_emulation = true;
47 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
48 MODULE_PARM_DESC(fbdev_emulation,
49 "Enable legacy fbdev emulation [default=true]");
51 static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
52 module_param(drm_fbdev_overalloc, int, 0444);
53 MODULE_PARM_DESC(drm_fbdev_overalloc,
54 "Overallocation of the fbdev buffer (%) [default="
55 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
57 static LIST_HEAD(kernel_fb_helper_list);
58 static DEFINE_MUTEX(kernel_fb_helper_lock);
60 /**
61 * DOC: fbdev helpers
63 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
64 * mode setting driver. They can be used mostly independently from the crtc
65 * helper functions used by many drivers to implement the kernel mode setting
66 * interfaces.
68 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
69 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
70 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
71 * default behaviour can override the third step with their own code.
72 * Teardown is done with drm_fb_helper_fini() after the fbdev device is
73 * unregisters using drm_fb_helper_unregister_fbi().
75 * At runtime drivers should restore the fbdev console by calling
76 * drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
77 * callback. They should also notify the fb helper code from updates to the
78 * output configuration by calling drm_fb_helper_hotplug_event(). For easier
79 * integration with the output polling code in drm_crtc_helper.c the modeset
80 * code provides a &drm_mode_config_funcs.output_poll_changed callback.
82 * All other functions exported by the fb helper library can be used to
83 * implement the fbdev driver interface by the driver.
85 * It is possible, though perhaps somewhat tricky, to implement race-free
86 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
87 * helper must be called first to initialize the minimum required to make
88 * hotplug detection work. Drivers also need to make sure to properly set up
89 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
90 * it is safe to enable interrupts and start processing hotplug events. At the
91 * same time, drivers should initialize all modeset objects such as CRTCs,
92 * encoders and connectors. To finish up the fbdev helper initialization, the
93 * drm_fb_helper_init() function is called. To probe for all attached displays
94 * and set up an initial configuration using the detected hardware, drivers
95 * should call drm_fb_helper_single_add_all_connectors() followed by
96 * drm_fb_helper_initial_config().
98 * If &drm_framebuffer_funcs.dirty is set, the
99 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
100 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
101 * away. This worker then calls the dirty() function ensuring that it will
102 * always run in process context since the fb_*() function could be running in
103 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
104 * callback it will also schedule dirty_work with the damage collected from the
105 * mmap page writes.
108 #define drm_fb_helper_for_each_connector(fbh, i__) \
109 for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
110 i__ = 0; i__ < (fbh)->connector_count; i__++)
112 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
113 struct drm_connector *connector)
115 struct drm_fb_helper_connector *fb_conn;
116 struct drm_fb_helper_connector **temp;
117 unsigned int count;
119 if (!drm_fbdev_emulation)
120 return 0;
122 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
124 count = fb_helper->connector_count + 1;
126 if (count > fb_helper->connector_info_alloc_count) {
127 size_t size = count * sizeof(fb_conn);
129 temp = krealloc(fb_helper->connector_info, size, GFP_KERNEL);
130 if (!temp)
131 return -ENOMEM;
133 fb_helper->connector_info_alloc_count = count;
134 fb_helper->connector_info = temp;
137 fb_conn = kzalloc(sizeof(*fb_conn), GFP_KERNEL);
138 if (!fb_conn)
139 return -ENOMEM;
141 drm_connector_get(connector);
142 fb_conn->connector = connector;
143 fb_helper->connector_info[fb_helper->connector_count++] = fb_conn;
144 return 0;
146 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
149 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
150 * emulation helper
151 * @fb_helper: fbdev initialized with drm_fb_helper_init
153 * This functions adds all the available connectors for use with the given
154 * fb_helper. This is a separate step to allow drivers to freely assign
155 * connectors to the fbdev, e.g. if some are reserved for special purposes or
156 * not adequate to be used for the fbcon.
158 * This function is protected against concurrent connector hotadds/removals
159 * using drm_fb_helper_add_one_connector() and
160 * drm_fb_helper_remove_one_connector().
162 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
164 struct drm_device *dev = fb_helper->dev;
165 struct drm_connector *connector;
166 struct drm_connector_list_iter conn_iter;
167 int i, ret = 0;
169 if (!drm_fbdev_emulation)
170 return 0;
172 mutex_lock(&dev->mode_config.mutex);
173 drm_connector_list_iter_begin(dev, &conn_iter);
174 drm_for_each_connector_iter(connector, &conn_iter) {
175 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
177 if (ret)
178 goto fail;
180 goto out;
182 fail:
183 drm_fb_helper_for_each_connector(fb_helper, i) {
184 struct drm_fb_helper_connector *fb_helper_connector =
185 fb_helper->connector_info[i];
187 drm_connector_put(fb_helper_connector->connector);
189 kfree(fb_helper_connector);
190 fb_helper->connector_info[i] = NULL;
192 fb_helper->connector_count = 0;
193 out:
194 drm_connector_list_iter_end(&conn_iter);
195 mutex_unlock(&dev->mode_config.mutex);
197 return ret;
199 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
201 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
202 struct drm_connector *connector)
204 struct drm_fb_helper_connector *fb_helper_connector;
205 int i, j;
207 if (!drm_fbdev_emulation)
208 return 0;
210 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
212 for (i = 0; i < fb_helper->connector_count; i++) {
213 if (fb_helper->connector_info[i]->connector == connector)
214 break;
217 if (i == fb_helper->connector_count)
218 return -EINVAL;
219 fb_helper_connector = fb_helper->connector_info[i];
220 drm_connector_put(fb_helper_connector->connector);
222 for (j = i + 1; j < fb_helper->connector_count; j++)
223 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
225 fb_helper->connector_count--;
226 kfree(fb_helper_connector);
228 return 0;
230 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
232 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
234 uint16_t *r_base, *g_base, *b_base;
235 int i;
237 if (helper->funcs->gamma_get == NULL)
238 return;
240 r_base = crtc->gamma_store;
241 g_base = r_base + crtc->gamma_size;
242 b_base = g_base + crtc->gamma_size;
244 for (i = 0; i < crtc->gamma_size; i++)
245 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
248 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
250 uint16_t *r_base, *g_base, *b_base;
252 if (crtc->funcs->gamma_set == NULL)
253 return;
255 r_base = crtc->gamma_store;
256 g_base = r_base + crtc->gamma_size;
257 b_base = g_base + crtc->gamma_size;
259 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
260 crtc->gamma_size, NULL);
264 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
265 * @info: fbdev registered by the helper
267 int drm_fb_helper_debug_enter(struct fb_info *info)
269 struct drm_fb_helper *helper = info->par;
270 const struct drm_crtc_helper_funcs *funcs;
271 int i;
273 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
274 for (i = 0; i < helper->crtc_count; i++) {
275 struct drm_mode_set *mode_set =
276 &helper->crtc_info[i].mode_set;
278 if (!mode_set->crtc->enabled)
279 continue;
281 funcs = mode_set->crtc->helper_private;
282 if (funcs->mode_set_base_atomic == NULL)
283 continue;
285 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
286 continue;
288 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
289 funcs->mode_set_base_atomic(mode_set->crtc,
290 mode_set->fb,
291 mode_set->x,
292 mode_set->y,
293 ENTER_ATOMIC_MODE_SET);
297 return 0;
299 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
301 /* Find the real fb for a given fb helper CRTC */
302 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
304 struct drm_device *dev = crtc->dev;
305 struct drm_crtc *c;
307 drm_for_each_crtc(c, dev) {
308 if (crtc->base.id == c->base.id)
309 return c->primary->fb;
312 return NULL;
316 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
317 * @info: fbdev registered by the helper
319 int drm_fb_helper_debug_leave(struct fb_info *info)
321 struct drm_fb_helper *helper = info->par;
322 struct drm_crtc *crtc;
323 const struct drm_crtc_helper_funcs *funcs;
324 struct drm_framebuffer *fb;
325 int i;
327 for (i = 0; i < helper->crtc_count; i++) {
328 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
330 crtc = mode_set->crtc;
331 funcs = crtc->helper_private;
332 fb = drm_mode_config_fb(crtc);
334 if (!crtc->enabled)
335 continue;
337 if (!fb) {
338 DRM_ERROR("no fb to restore??\n");
339 continue;
342 if (funcs->mode_set_base_atomic == NULL)
343 continue;
345 if (drm_drv_uses_atomic_modeset(crtc->dev))
346 continue;
348 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
349 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
350 crtc->y, LEAVE_ATOMIC_MODE_SET);
353 return 0;
355 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
357 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
359 struct drm_device *dev = fb_helper->dev;
360 struct drm_plane *plane;
361 struct drm_atomic_state *state;
362 int i, ret;
363 unsigned int plane_mask;
365 state = drm_atomic_state_alloc(dev);
366 if (!state)
367 return -ENOMEM;
369 state->acquire_ctx = dev->mode_config.acquire_ctx;
370 retry:
371 plane_mask = 0;
372 drm_for_each_plane(plane, dev) {
373 struct drm_plane_state *plane_state;
375 plane_state = drm_atomic_get_plane_state(state, plane);
376 if (IS_ERR(plane_state)) {
377 ret = PTR_ERR(plane_state);
378 goto fail;
381 plane_state->rotation = DRM_MODE_ROTATE_0;
383 plane->old_fb = plane->fb;
384 plane_mask |= 1 << drm_plane_index(plane);
386 /* disable non-primary: */
387 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
388 continue;
390 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
391 if (ret != 0)
392 goto fail;
395 for (i = 0; i < fb_helper->crtc_count; i++) {
396 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
398 ret = __drm_atomic_helper_set_config(mode_set, state);
399 if (ret != 0)
400 goto fail;
403 ret = drm_atomic_commit(state);
405 fail:
406 drm_atomic_clean_old_fb(dev, plane_mask, ret);
408 if (ret == -EDEADLK)
409 goto backoff;
411 drm_atomic_state_put(state);
412 return ret;
414 backoff:
415 drm_atomic_state_clear(state);
416 drm_atomic_legacy_backoff(state);
418 goto retry;
421 static int restore_fbdev_mode_legacy(struct drm_fb_helper *fb_helper)
423 struct drm_device *dev = fb_helper->dev;
424 struct drm_plane *plane;
425 int i;
427 drm_for_each_plane(plane, dev) {
428 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
429 drm_plane_force_disable(plane);
431 if (plane->rotation_property)
432 drm_mode_plane_set_obj_prop(plane,
433 plane->rotation_property,
434 DRM_MODE_ROTATE_0);
437 for (i = 0; i < fb_helper->crtc_count; i++) {
438 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
439 struct drm_crtc *crtc = mode_set->crtc;
440 int ret;
442 if (crtc->funcs->cursor_set2) {
443 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
444 if (ret)
445 return ret;
446 } else if (crtc->funcs->cursor_set) {
447 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
448 if (ret)
449 return ret;
452 ret = drm_mode_set_config_internal(mode_set);
453 if (ret)
454 return ret;
457 return 0;
460 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
462 struct drm_device *dev = fb_helper->dev;
464 drm_warn_on_modeset_not_all_locked(dev);
466 if (drm_drv_uses_atomic_modeset(dev))
467 return restore_fbdev_mode_atomic(fb_helper);
468 else
469 return restore_fbdev_mode_legacy(fb_helper);
473 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
474 * @fb_helper: fbcon to restore
476 * This should be called from driver's drm &drm_driver.lastclose callback
477 * when implementing an fbcon on top of kms using this helper. This ensures that
478 * the user isn't greeted with a black screen when e.g. X dies.
480 * RETURNS:
481 * Zero if everything went ok, negative error code otherwise.
483 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
485 struct drm_device *dev = fb_helper->dev;
486 bool do_delayed;
487 int ret;
489 if (!drm_fbdev_emulation)
490 return -ENODEV;
492 drm_modeset_lock_all(dev);
493 ret = restore_fbdev_mode(fb_helper);
495 do_delayed = fb_helper->delayed_hotplug;
496 if (do_delayed)
497 fb_helper->delayed_hotplug = false;
498 drm_modeset_unlock_all(dev);
500 if (do_delayed)
501 drm_fb_helper_hotplug_event(fb_helper);
502 return ret;
504 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
506 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
508 struct drm_device *dev = fb_helper->dev;
509 struct drm_crtc *crtc;
510 int bound = 0, crtcs_bound = 0;
513 * Sometimes user space wants everything disabled, so don't steal the
514 * display if there's a master.
516 if (READ_ONCE(dev->master))
517 return false;
519 drm_for_each_crtc(crtc, dev) {
520 if (crtc->primary->fb)
521 crtcs_bound++;
522 if (crtc->primary->fb == fb_helper->fb)
523 bound++;
526 if (bound < crtcs_bound)
527 return false;
529 return true;
532 #ifdef CONFIG_MAGIC_SYSRQ
534 * restore fbcon display for all kms driver's using this helper, used for sysrq
535 * and panic handling.
537 static bool drm_fb_helper_force_kernel_mode(void)
539 bool ret, error = false;
540 struct drm_fb_helper *helper;
542 if (list_empty(&kernel_fb_helper_list))
543 return false;
545 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
546 struct drm_device *dev = helper->dev;
548 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
549 continue;
551 drm_modeset_lock_all(dev);
552 ret = restore_fbdev_mode(helper);
553 if (ret)
554 error = true;
555 drm_modeset_unlock_all(dev);
557 return error;
560 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
562 bool ret;
564 ret = drm_fb_helper_force_kernel_mode();
565 if (ret == true)
566 DRM_ERROR("Failed to restore crtc configuration\n");
568 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
570 static void drm_fb_helper_sysrq(int dummy1)
572 schedule_work(&drm_fb_helper_restore_work);
575 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
576 .handler = drm_fb_helper_sysrq,
577 .help_msg = "force-fb(V)",
578 .action_msg = "Restore framebuffer console",
580 #else
581 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
582 #endif
584 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
586 struct drm_fb_helper *fb_helper = info->par;
587 struct drm_device *dev = fb_helper->dev;
588 struct drm_crtc *crtc;
589 struct drm_connector *connector;
590 int i, j;
593 * For each CRTC in this fb, turn the connectors on/off.
595 drm_modeset_lock_all(dev);
596 if (!drm_fb_helper_is_bound(fb_helper)) {
597 drm_modeset_unlock_all(dev);
598 return;
601 for (i = 0; i < fb_helper->crtc_count; i++) {
602 crtc = fb_helper->crtc_info[i].mode_set.crtc;
604 if (!crtc->enabled)
605 continue;
607 /* Walk the connectors & encoders on this fb turning them on/off */
608 drm_fb_helper_for_each_connector(fb_helper, j) {
609 connector = fb_helper->connector_info[j]->connector;
610 connector->funcs->dpms(connector, dpms_mode);
611 drm_object_property_set_value(&connector->base,
612 dev->mode_config.dpms_property, dpms_mode);
615 drm_modeset_unlock_all(dev);
619 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
620 * @blank: desired blanking state
621 * @info: fbdev registered by the helper
623 int drm_fb_helper_blank(int blank, struct fb_info *info)
625 if (oops_in_progress)
626 return -EBUSY;
628 switch (blank) {
629 /* Display: On; HSync: On, VSync: On */
630 case FB_BLANK_UNBLANK:
631 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
632 break;
633 /* Display: Off; HSync: On, VSync: On */
634 case FB_BLANK_NORMAL:
635 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
636 break;
637 /* Display: Off; HSync: Off, VSync: On */
638 case FB_BLANK_HSYNC_SUSPEND:
639 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
640 break;
641 /* Display: Off; HSync: On, VSync: Off */
642 case FB_BLANK_VSYNC_SUSPEND:
643 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
644 break;
645 /* Display: Off; HSync: Off, VSync: Off */
646 case FB_BLANK_POWERDOWN:
647 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
648 break;
650 return 0;
652 EXPORT_SYMBOL(drm_fb_helper_blank);
654 static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper,
655 struct drm_mode_set *modeset)
657 int i;
659 for (i = 0; i < modeset->num_connectors; i++) {
660 drm_connector_put(modeset->connectors[i]);
661 modeset->connectors[i] = NULL;
663 modeset->num_connectors = 0;
665 drm_mode_destroy(helper->dev, modeset->mode);
666 modeset->mode = NULL;
668 /* FIXME should hold a ref? */
669 modeset->fb = NULL;
672 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
674 int i;
676 for (i = 0; i < helper->connector_count; i++) {
677 drm_connector_put(helper->connector_info[i]->connector);
678 kfree(helper->connector_info[i]);
680 kfree(helper->connector_info);
682 for (i = 0; i < helper->crtc_count; i++) {
683 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set;
685 drm_fb_helper_modeset_release(helper, modeset);
686 kfree(modeset->connectors);
688 kfree(helper->crtc_info);
691 static void drm_fb_helper_resume_worker(struct work_struct *work)
693 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
694 resume_work);
696 console_lock();
697 fb_set_suspend(helper->fbdev, 0);
698 console_unlock();
701 static void drm_fb_helper_dirty_work(struct work_struct *work)
703 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
704 dirty_work);
705 struct drm_clip_rect *clip = &helper->dirty_clip;
706 struct drm_clip_rect clip_copy;
707 unsigned long flags;
709 spin_lock_irqsave(&helper->dirty_lock, flags);
710 clip_copy = *clip;
711 clip->x1 = clip->y1 = ~0;
712 clip->x2 = clip->y2 = 0;
713 spin_unlock_irqrestore(&helper->dirty_lock, flags);
715 /* call dirty callback only when it has been really touched */
716 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)
717 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
721 * drm_fb_helper_prepare - setup a drm_fb_helper structure
722 * @dev: DRM device
723 * @helper: driver-allocated fbdev helper structure to set up
724 * @funcs: pointer to structure of functions associate with this helper
726 * Sets up the bare minimum to make the framebuffer helper usable. This is
727 * useful to implement race-free initialization of the polling helpers.
729 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
730 const struct drm_fb_helper_funcs *funcs)
732 INIT_LIST_HEAD(&helper->kernel_fb_list);
733 spin_lock_init(&helper->dirty_lock);
734 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
735 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
736 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
737 helper->funcs = funcs;
738 helper->dev = dev;
740 EXPORT_SYMBOL(drm_fb_helper_prepare);
743 * drm_fb_helper_init - initialize a &struct drm_fb_helper
744 * @dev: drm device
745 * @fb_helper: driver-allocated fbdev helper structure to initialize
746 * @max_conn_count: max connector count
748 * This allocates the structures for the fbdev helper with the given limits.
749 * Note that this won't yet touch the hardware (through the driver interfaces)
750 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
751 * to allow driver writes more control over the exact init sequence.
753 * Drivers must call drm_fb_helper_prepare() before calling this function.
755 * RETURNS:
756 * Zero if everything went ok, nonzero otherwise.
758 int drm_fb_helper_init(struct drm_device *dev,
759 struct drm_fb_helper *fb_helper,
760 int max_conn_count)
762 struct drm_crtc *crtc;
763 struct drm_mode_config *config = &dev->mode_config;
764 int i;
766 if (!drm_fbdev_emulation)
767 return 0;
769 if (!max_conn_count)
770 return -EINVAL;
772 fb_helper->crtc_info = kcalloc(config->num_crtc, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
773 if (!fb_helper->crtc_info)
774 return -ENOMEM;
776 fb_helper->crtc_count = config->num_crtc;
777 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
778 if (!fb_helper->connector_info) {
779 kfree(fb_helper->crtc_info);
780 return -ENOMEM;
782 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
783 fb_helper->connector_count = 0;
785 for (i = 0; i < fb_helper->crtc_count; i++) {
786 fb_helper->crtc_info[i].mode_set.connectors =
787 kcalloc(max_conn_count,
788 sizeof(struct drm_connector *),
789 GFP_KERNEL);
791 if (!fb_helper->crtc_info[i].mode_set.connectors)
792 goto out_free;
793 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
796 i = 0;
797 drm_for_each_crtc(crtc, dev) {
798 fb_helper->crtc_info[i].mode_set.crtc = crtc;
799 i++;
802 return 0;
803 out_free:
804 drm_fb_helper_crtc_free(fb_helper);
805 return -ENOMEM;
807 EXPORT_SYMBOL(drm_fb_helper_init);
810 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
811 * @fb_helper: driver-allocated fbdev helper
813 * A helper to alloc fb_info and the members cmap and apertures. Called
814 * by the driver within the fb_probe fb_helper callback function. Drivers do not
815 * need to release the allocated fb_info structure themselves, this is
816 * automatically done when calling drm_fb_helper_fini().
818 * RETURNS:
819 * fb_info pointer if things went okay, pointer containing error code
820 * otherwise
822 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
824 struct device *dev = fb_helper->dev->dev;
825 struct fb_info *info;
826 int ret;
828 info = framebuffer_alloc(0, dev);
829 if (!info)
830 return ERR_PTR(-ENOMEM);
832 ret = fb_alloc_cmap(&info->cmap, 256, 0);
833 if (ret)
834 goto err_release;
836 info->apertures = alloc_apertures(1);
837 if (!info->apertures) {
838 ret = -ENOMEM;
839 goto err_free_cmap;
842 fb_helper->fbdev = info;
844 return info;
846 err_free_cmap:
847 fb_dealloc_cmap(&info->cmap);
848 err_release:
849 framebuffer_release(info);
850 return ERR_PTR(ret);
852 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
855 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
856 * @fb_helper: driver-allocated fbdev helper
858 * A wrapper around unregister_framebuffer, to release the fb_info
859 * framebuffer device. This must be called before releasing all resources for
860 * @fb_helper by calling drm_fb_helper_fini().
862 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
864 if (fb_helper && fb_helper->fbdev)
865 unregister_framebuffer(fb_helper->fbdev);
867 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
870 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
871 * @fb_helper: driver-allocated fbdev helper
873 * This cleans up all remaining resources associated with @fb_helper. Must be
874 * called after drm_fb_helper_unlink_fbi() was called.
876 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
878 struct fb_info *info;
880 if (!drm_fbdev_emulation || !fb_helper)
881 return;
883 info = fb_helper->fbdev;
884 if (info) {
885 if (info->cmap.len)
886 fb_dealloc_cmap(&info->cmap);
887 framebuffer_release(info);
889 fb_helper->fbdev = NULL;
891 cancel_work_sync(&fb_helper->resume_work);
892 cancel_work_sync(&fb_helper->dirty_work);
894 mutex_lock(&kernel_fb_helper_lock);
895 if (!list_empty(&fb_helper->kernel_fb_list)) {
896 list_del(&fb_helper->kernel_fb_list);
897 if (list_empty(&kernel_fb_helper_list))
898 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
900 mutex_unlock(&kernel_fb_helper_lock);
902 drm_fb_helper_crtc_free(fb_helper);
905 EXPORT_SYMBOL(drm_fb_helper_fini);
908 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
909 * @fb_helper: driver-allocated fbdev helper
911 * A wrapper around unlink_framebuffer implemented by fbdev core
913 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
915 if (fb_helper && fb_helper->fbdev)
916 unlink_framebuffer(fb_helper->fbdev);
918 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
920 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
921 u32 width, u32 height)
923 struct drm_fb_helper *helper = info->par;
924 struct drm_clip_rect *clip = &helper->dirty_clip;
925 unsigned long flags;
927 if (!helper->fb->funcs->dirty)
928 return;
930 spin_lock_irqsave(&helper->dirty_lock, flags);
931 clip->x1 = min_t(u32, clip->x1, x);
932 clip->y1 = min_t(u32, clip->y1, y);
933 clip->x2 = max_t(u32, clip->x2, x + width);
934 clip->y2 = max_t(u32, clip->y2, y + height);
935 spin_unlock_irqrestore(&helper->dirty_lock, flags);
937 schedule_work(&helper->dirty_work);
941 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
942 * @info: fb_info struct pointer
943 * @pagelist: list of dirty mmap framebuffer pages
945 * This function is used as the &fb_deferred_io.deferred_io
946 * callback function for flushing the fbdev mmap writes.
948 void drm_fb_helper_deferred_io(struct fb_info *info,
949 struct list_head *pagelist)
951 unsigned long start, end, min, max;
952 struct page *page;
953 u32 y1, y2;
955 min = ULONG_MAX;
956 max = 0;
957 list_for_each_entry(page, pagelist, lru) {
958 start = page->index << PAGE_SHIFT;
959 end = start + PAGE_SIZE - 1;
960 min = min(min, start);
961 max = max(max, end);
964 if (min < max) {
965 y1 = min / info->fix.line_length;
966 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
967 info->var.yres);
968 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
971 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
974 * drm_fb_helper_sys_read - wrapper around fb_sys_read
975 * @info: fb_info struct pointer
976 * @buf: userspace buffer to read from framebuffer memory
977 * @count: number of bytes to read from framebuffer memory
978 * @ppos: read offset within framebuffer memory
980 * A wrapper around fb_sys_read implemented by fbdev core
982 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
983 size_t count, loff_t *ppos)
985 return fb_sys_read(info, buf, count, ppos);
987 EXPORT_SYMBOL(drm_fb_helper_sys_read);
990 * drm_fb_helper_sys_write - wrapper around fb_sys_write
991 * @info: fb_info struct pointer
992 * @buf: userspace buffer to write to framebuffer memory
993 * @count: number of bytes to write to framebuffer memory
994 * @ppos: write offset within framebuffer memory
996 * A wrapper around fb_sys_write implemented by fbdev core
998 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
999 size_t count, loff_t *ppos)
1001 ssize_t ret;
1003 ret = fb_sys_write(info, buf, count, ppos);
1004 if (ret > 0)
1005 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
1006 info->var.yres);
1008 return ret;
1010 EXPORT_SYMBOL(drm_fb_helper_sys_write);
1013 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
1014 * @info: fbdev registered by the helper
1015 * @rect: info about rectangle to fill
1017 * A wrapper around sys_fillrect implemented by fbdev core
1019 void drm_fb_helper_sys_fillrect(struct fb_info *info,
1020 const struct fb_fillrect *rect)
1022 sys_fillrect(info, rect);
1023 drm_fb_helper_dirty(info, rect->dx, rect->dy,
1024 rect->width, rect->height);
1026 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
1029 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
1030 * @info: fbdev registered by the helper
1031 * @area: info about area to copy
1033 * A wrapper around sys_copyarea implemented by fbdev core
1035 void drm_fb_helper_sys_copyarea(struct fb_info *info,
1036 const struct fb_copyarea *area)
1038 sys_copyarea(info, area);
1039 drm_fb_helper_dirty(info, area->dx, area->dy,
1040 area->width, area->height);
1042 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
1045 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1046 * @info: fbdev registered by the helper
1047 * @image: info about image to blit
1049 * A wrapper around sys_imageblit implemented by fbdev core
1051 void drm_fb_helper_sys_imageblit(struct fb_info *info,
1052 const struct fb_image *image)
1054 sys_imageblit(info, image);
1055 drm_fb_helper_dirty(info, image->dx, image->dy,
1056 image->width, image->height);
1058 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
1061 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1062 * @info: fbdev registered by the helper
1063 * @rect: info about rectangle to fill
1065 * A wrapper around cfb_imageblit implemented by fbdev core
1067 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1068 const struct fb_fillrect *rect)
1070 cfb_fillrect(info, rect);
1071 drm_fb_helper_dirty(info, rect->dx, rect->dy,
1072 rect->width, rect->height);
1074 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1077 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1078 * @info: fbdev registered by the helper
1079 * @area: info about area to copy
1081 * A wrapper around cfb_copyarea implemented by fbdev core
1083 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1084 const struct fb_copyarea *area)
1086 cfb_copyarea(info, area);
1087 drm_fb_helper_dirty(info, area->dx, area->dy,
1088 area->width, area->height);
1090 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1093 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1094 * @info: fbdev registered by the helper
1095 * @image: info about image to blit
1097 * A wrapper around cfb_imageblit implemented by fbdev core
1099 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1100 const struct fb_image *image)
1102 cfb_imageblit(info, image);
1103 drm_fb_helper_dirty(info, image->dx, image->dy,
1104 image->width, image->height);
1106 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1109 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1110 * @fb_helper: driver-allocated fbdev helper
1111 * @suspend: whether to suspend or resume
1113 * A wrapper around fb_set_suspend implemented by fbdev core.
1114 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1115 * the lock yourself
1117 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1119 if (fb_helper && fb_helper->fbdev)
1120 fb_set_suspend(fb_helper->fbdev, suspend);
1122 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1125 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1126 * takes the console lock
1127 * @fb_helper: driver-allocated fbdev helper
1128 * @suspend: whether to suspend or resume
1130 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1131 * isn't available on resume, a worker is tasked with waiting for the lock
1132 * to become available. The console lock can be pretty contented on resume
1133 * due to all the printk activity.
1135 * This function can be called multiple times with the same state since
1136 * &fb_info.state is checked to see if fbdev is running or not before locking.
1138 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1140 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1141 bool suspend)
1143 if (!fb_helper || !fb_helper->fbdev)
1144 return;
1146 /* make sure there's no pending/ongoing resume */
1147 flush_work(&fb_helper->resume_work);
1149 if (suspend) {
1150 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
1151 return;
1153 console_lock();
1155 } else {
1156 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
1157 return;
1159 if (!console_trylock()) {
1160 schedule_work(&fb_helper->resume_work);
1161 return;
1165 fb_set_suspend(fb_helper->fbdev, suspend);
1166 console_unlock();
1168 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1170 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1171 u16 blue, u16 regno, struct fb_info *info)
1173 struct drm_fb_helper *fb_helper = info->par;
1174 struct drm_framebuffer *fb = fb_helper->fb;
1176 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1177 u32 *palette;
1178 u32 value;
1179 /* place color in psuedopalette */
1180 if (regno > 16)
1181 return -EINVAL;
1182 palette = (u32 *)info->pseudo_palette;
1183 red >>= (16 - info->var.red.length);
1184 green >>= (16 - info->var.green.length);
1185 blue >>= (16 - info->var.blue.length);
1186 value = (red << info->var.red.offset) |
1187 (green << info->var.green.offset) |
1188 (blue << info->var.blue.offset);
1189 if (info->var.transp.length > 0) {
1190 u32 mask = (1 << info->var.transp.length) - 1;
1192 mask <<= info->var.transp.offset;
1193 value |= mask;
1195 palette[regno] = value;
1196 return 0;
1200 * The driver really shouldn't advertise pseudo/directcolor
1201 * visuals if it can't deal with the palette.
1203 if (WARN_ON(!fb_helper->funcs->gamma_set ||
1204 !fb_helper->funcs->gamma_get))
1205 return -EINVAL;
1207 WARN_ON(fb->format->cpp[0] != 1);
1209 fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1211 return 0;
1215 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1216 * @cmap: cmap to set
1217 * @info: fbdev registered by the helper
1219 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1221 struct drm_fb_helper *fb_helper = info->par;
1222 struct drm_device *dev = fb_helper->dev;
1223 const struct drm_crtc_helper_funcs *crtc_funcs;
1224 u16 *red, *green, *blue, *transp;
1225 struct drm_crtc *crtc;
1226 int i, j, rc = 0;
1227 int start;
1229 if (oops_in_progress)
1230 return -EBUSY;
1232 drm_modeset_lock_all(dev);
1233 if (!drm_fb_helper_is_bound(fb_helper)) {
1234 drm_modeset_unlock_all(dev);
1235 return -EBUSY;
1238 for (i = 0; i < fb_helper->crtc_count; i++) {
1239 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1240 crtc_funcs = crtc->helper_private;
1242 red = cmap->red;
1243 green = cmap->green;
1244 blue = cmap->blue;
1245 transp = cmap->transp;
1246 start = cmap->start;
1248 for (j = 0; j < cmap->len; j++) {
1249 u16 hred, hgreen, hblue, htransp = 0xffff;
1251 hred = *red++;
1252 hgreen = *green++;
1253 hblue = *blue++;
1255 if (transp)
1256 htransp = *transp++;
1258 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1259 if (rc)
1260 goto out;
1262 if (crtc_funcs->load_lut)
1263 crtc_funcs->load_lut(crtc);
1265 out:
1266 drm_modeset_unlock_all(dev);
1267 return rc;
1269 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1272 * drm_fb_helper_ioctl - legacy ioctl implementation
1273 * @info: fbdev registered by the helper
1274 * @cmd: ioctl command
1275 * @arg: ioctl argument
1277 * A helper to implement the standard fbdev ioctl. Only
1278 * FBIO_WAITFORVSYNC is implemented for now.
1280 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1281 unsigned long arg)
1283 struct drm_fb_helper *fb_helper = info->par;
1284 struct drm_device *dev = fb_helper->dev;
1285 struct drm_mode_set *mode_set;
1286 struct drm_crtc *crtc;
1287 int ret = 0;
1289 mutex_lock(&dev->mode_config.mutex);
1290 if (!drm_fb_helper_is_bound(fb_helper)) {
1291 ret = -EBUSY;
1292 goto unlock;
1295 switch (cmd) {
1296 case FBIO_WAITFORVSYNC:
1298 * Only consider the first CRTC.
1300 * This ioctl is supposed to take the CRTC number as
1301 * an argument, but in fbdev times, what that number
1302 * was supposed to be was quite unclear, different
1303 * drivers were passing that argument differently
1304 * (some by reference, some by value), and most of the
1305 * userspace applications were just hardcoding 0 as an
1306 * argument.
1308 * The first CRTC should be the integrated panel on
1309 * most drivers, so this is the best choice we can
1310 * make. If we're not smart enough here, one should
1311 * just consider switch the userspace to KMS.
1313 mode_set = &fb_helper->crtc_info[0].mode_set;
1314 crtc = mode_set->crtc;
1317 * Only wait for a vblank event if the CRTC is
1318 * enabled, otherwise just don't do anythintg,
1319 * not even report an error.
1321 ret = drm_crtc_vblank_get(crtc);
1322 if (!ret) {
1323 drm_crtc_wait_one_vblank(crtc);
1324 drm_crtc_vblank_put(crtc);
1327 ret = 0;
1328 goto unlock;
1329 default:
1330 ret = -ENOTTY;
1333 unlock:
1334 mutex_unlock(&dev->mode_config.mutex);
1335 return ret;
1337 EXPORT_SYMBOL(drm_fb_helper_ioctl);
1340 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1341 * @var: screeninfo to check
1342 * @info: fbdev registered by the helper
1344 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1345 struct fb_info *info)
1347 struct drm_fb_helper *fb_helper = info->par;
1348 struct drm_framebuffer *fb = fb_helper->fb;
1349 int depth;
1351 if (var->pixclock != 0 || in_dbg_master())
1352 return -EINVAL;
1355 * Changes struct fb_var_screeninfo are currently not pushed back
1356 * to KMS, hence fail if different settings are requested.
1358 if (var->bits_per_pixel != fb->format->cpp[0] * 8 ||
1359 var->xres > fb->width || var->yres > fb->height ||
1360 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1361 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb "
1362 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1363 var->xres, var->yres, var->bits_per_pixel,
1364 var->xres_virtual, var->yres_virtual,
1365 fb->width, fb->height, fb->format->cpp[0] * 8);
1366 return -EINVAL;
1369 switch (var->bits_per_pixel) {
1370 case 16:
1371 depth = (var->green.length == 6) ? 16 : 15;
1372 break;
1373 case 32:
1374 depth = (var->transp.length > 0) ? 32 : 24;
1375 break;
1376 default:
1377 depth = var->bits_per_pixel;
1378 break;
1381 switch (depth) {
1382 case 8:
1383 var->red.offset = 0;
1384 var->green.offset = 0;
1385 var->blue.offset = 0;
1386 var->red.length = 8;
1387 var->green.length = 8;
1388 var->blue.length = 8;
1389 var->transp.length = 0;
1390 var->transp.offset = 0;
1391 break;
1392 case 15:
1393 var->red.offset = 10;
1394 var->green.offset = 5;
1395 var->blue.offset = 0;
1396 var->red.length = 5;
1397 var->green.length = 5;
1398 var->blue.length = 5;
1399 var->transp.length = 1;
1400 var->transp.offset = 15;
1401 break;
1402 case 16:
1403 var->red.offset = 11;
1404 var->green.offset = 5;
1405 var->blue.offset = 0;
1406 var->red.length = 5;
1407 var->green.length = 6;
1408 var->blue.length = 5;
1409 var->transp.length = 0;
1410 var->transp.offset = 0;
1411 break;
1412 case 24:
1413 var->red.offset = 16;
1414 var->green.offset = 8;
1415 var->blue.offset = 0;
1416 var->red.length = 8;
1417 var->green.length = 8;
1418 var->blue.length = 8;
1419 var->transp.length = 0;
1420 var->transp.offset = 0;
1421 break;
1422 case 32:
1423 var->red.offset = 16;
1424 var->green.offset = 8;
1425 var->blue.offset = 0;
1426 var->red.length = 8;
1427 var->green.length = 8;
1428 var->blue.length = 8;
1429 var->transp.length = 8;
1430 var->transp.offset = 24;
1431 break;
1432 default:
1433 return -EINVAL;
1435 return 0;
1437 EXPORT_SYMBOL(drm_fb_helper_check_var);
1440 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1441 * @info: fbdev registered by the helper
1443 * This will let fbcon do the mode init and is called at initialization time by
1444 * the fbdev core when registering the driver, and later on through the hotplug
1445 * callback.
1447 int drm_fb_helper_set_par(struct fb_info *info)
1449 struct drm_fb_helper *fb_helper = info->par;
1450 struct fb_var_screeninfo *var = &info->var;
1452 if (oops_in_progress)
1453 return -EBUSY;
1455 if (var->pixclock != 0) {
1456 DRM_ERROR("PIXEL CLOCK SET\n");
1457 return -EINVAL;
1460 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1462 return 0;
1464 EXPORT_SYMBOL(drm_fb_helper_set_par);
1466 static int pan_display_atomic(struct fb_var_screeninfo *var,
1467 struct fb_info *info)
1469 struct drm_fb_helper *fb_helper = info->par;
1470 struct drm_device *dev = fb_helper->dev;
1471 struct drm_atomic_state *state;
1472 struct drm_plane *plane;
1473 int i, ret;
1474 unsigned int plane_mask;
1476 state = drm_atomic_state_alloc(dev);
1477 if (!state)
1478 return -ENOMEM;
1480 state->acquire_ctx = dev->mode_config.acquire_ctx;
1481 retry:
1482 plane_mask = 0;
1483 for (i = 0; i < fb_helper->crtc_count; i++) {
1484 struct drm_mode_set *mode_set;
1486 mode_set = &fb_helper->crtc_info[i].mode_set;
1488 mode_set->x = var->xoffset;
1489 mode_set->y = var->yoffset;
1491 ret = __drm_atomic_helper_set_config(mode_set, state);
1492 if (ret != 0)
1493 goto fail;
1495 plane = mode_set->crtc->primary;
1496 plane_mask |= (1 << drm_plane_index(plane));
1497 plane->old_fb = plane->fb;
1500 ret = drm_atomic_commit(state);
1501 if (ret != 0)
1502 goto fail;
1504 info->var.xoffset = var->xoffset;
1505 info->var.yoffset = var->yoffset;
1507 fail:
1508 drm_atomic_clean_old_fb(dev, plane_mask, ret);
1510 if (ret == -EDEADLK)
1511 goto backoff;
1513 drm_atomic_state_put(state);
1514 return ret;
1516 backoff:
1517 drm_atomic_state_clear(state);
1518 drm_atomic_legacy_backoff(state);
1520 goto retry;
1523 static int pan_display_legacy(struct fb_var_screeninfo *var,
1524 struct fb_info *info)
1526 struct drm_fb_helper *fb_helper = info->par;
1527 struct drm_mode_set *modeset;
1528 int ret = 0;
1529 int i;
1531 for (i = 0; i < fb_helper->crtc_count; i++) {
1532 modeset = &fb_helper->crtc_info[i].mode_set;
1534 modeset->x = var->xoffset;
1535 modeset->y = var->yoffset;
1537 if (modeset->num_connectors) {
1538 ret = drm_mode_set_config_internal(modeset);
1539 if (!ret) {
1540 info->var.xoffset = var->xoffset;
1541 info->var.yoffset = var->yoffset;
1546 return ret;
1550 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1551 * @var: updated screen information
1552 * @info: fbdev registered by the helper
1554 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1555 struct fb_info *info)
1557 struct drm_fb_helper *fb_helper = info->par;
1558 struct drm_device *dev = fb_helper->dev;
1559 int ret;
1561 if (oops_in_progress)
1562 return -EBUSY;
1564 drm_modeset_lock_all(dev);
1565 if (!drm_fb_helper_is_bound(fb_helper)) {
1566 drm_modeset_unlock_all(dev);
1567 return -EBUSY;
1570 if (drm_drv_uses_atomic_modeset(dev))
1571 ret = pan_display_atomic(var, info);
1572 else
1573 ret = pan_display_legacy(var, info);
1574 drm_modeset_unlock_all(dev);
1576 return ret;
1578 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1581 * Allocates the backing storage and sets up the fbdev info structure through
1582 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1583 * notifier.
1585 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1586 int preferred_bpp)
1588 int ret = 0;
1589 int crtc_count = 0;
1590 int i;
1591 struct drm_fb_helper_surface_size sizes;
1592 int gamma_size = 0;
1594 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1595 sizes.surface_depth = 24;
1596 sizes.surface_bpp = 32;
1597 sizes.fb_width = (u32)-1;
1598 sizes.fb_height = (u32)-1;
1600 /* if driver picks 8 or 16 by default use that for both depth/bpp */
1601 if (preferred_bpp != sizes.surface_bpp)
1602 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1604 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1605 drm_fb_helper_for_each_connector(fb_helper, i) {
1606 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1607 struct drm_cmdline_mode *cmdline_mode;
1609 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1611 if (cmdline_mode->bpp_specified) {
1612 switch (cmdline_mode->bpp) {
1613 case 8:
1614 sizes.surface_depth = sizes.surface_bpp = 8;
1615 break;
1616 case 15:
1617 sizes.surface_depth = 15;
1618 sizes.surface_bpp = 16;
1619 break;
1620 case 16:
1621 sizes.surface_depth = sizes.surface_bpp = 16;
1622 break;
1623 case 24:
1624 sizes.surface_depth = sizes.surface_bpp = 24;
1625 break;
1626 case 32:
1627 sizes.surface_depth = 24;
1628 sizes.surface_bpp = 32;
1629 break;
1631 break;
1635 crtc_count = 0;
1636 for (i = 0; i < fb_helper->crtc_count; i++) {
1637 struct drm_display_mode *desired_mode;
1638 struct drm_mode_set *mode_set;
1639 int x, y, j;
1640 /* in case of tile group, are we the last tile vert or horiz?
1641 * If no tile group you are always the last one both vertically
1642 * and horizontally
1644 bool lastv = true, lasth = true;
1646 desired_mode = fb_helper->crtc_info[i].desired_mode;
1647 mode_set = &fb_helper->crtc_info[i].mode_set;
1649 if (!desired_mode)
1650 continue;
1652 crtc_count++;
1654 x = fb_helper->crtc_info[i].x;
1655 y = fb_helper->crtc_info[i].y;
1657 if (gamma_size == 0)
1658 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1660 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1661 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1663 for (j = 0; j < mode_set->num_connectors; j++) {
1664 struct drm_connector *connector = mode_set->connectors[j];
1666 if (connector->has_tile) {
1667 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1668 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1669 /* cloning to multiple tiles is just crazy-talk, so: */
1670 break;
1674 if (lasth)
1675 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1676 if (lastv)
1677 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1680 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1682 * hmm everyone went away - assume VGA cable just fell out
1683 * and will come back later.
1685 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1686 sizes.fb_width = sizes.surface_width = 1024;
1687 sizes.fb_height = sizes.surface_height = 768;
1690 /* Handle our overallocation */
1691 sizes.surface_height *= drm_fbdev_overalloc;
1692 sizes.surface_height /= 100;
1694 /* push down into drivers */
1695 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1696 if (ret < 0)
1697 return ret;
1700 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1701 * events, but at init time drm_setup_crtcs needs to be called before
1702 * the fb is allocated (since we need to figure out the desired size of
1703 * the fb before we can allocate it ...). Hence we need to fix things up
1704 * here again.
1706 for (i = 0; i < fb_helper->crtc_count; i++)
1707 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1708 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1710 return 0;
1714 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1715 * @info: fbdev registered by the helper
1716 * @pitch: desired pitch
1717 * @depth: desired depth
1719 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1720 * fbdev emulations. Drivers which support acceleration methods which impose
1721 * additional constraints need to set up their own limits.
1723 * Drivers should call this (or their equivalent setup code) from their
1724 * &drm_fb_helper_funcs.fb_probe callback.
1726 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1727 uint32_t depth)
1729 info->fix.type = FB_TYPE_PACKED_PIXELS;
1730 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1731 FB_VISUAL_TRUECOLOR;
1732 info->fix.mmio_start = 0;
1733 info->fix.mmio_len = 0;
1734 info->fix.type_aux = 0;
1735 info->fix.xpanstep = 1; /* doing it in hw */
1736 info->fix.ypanstep = 1; /* doing it in hw */
1737 info->fix.ywrapstep = 0;
1738 info->fix.accel = FB_ACCEL_NONE;
1740 info->fix.line_length = pitch;
1742 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1745 * drm_fb_helper_fill_var - initalizes variable fbdev information
1746 * @info: fbdev instance to set up
1747 * @fb_helper: fb helper instance to use as template
1748 * @fb_width: desired fb width
1749 * @fb_height: desired fb height
1751 * Sets up the variable fbdev metainformation from the given fb helper instance
1752 * and the drm framebuffer allocated in &drm_fb_helper.fb.
1754 * Drivers should call this (or their equivalent setup code) from their
1755 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1756 * backing storage framebuffer.
1758 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1759 uint32_t fb_width, uint32_t fb_height)
1761 struct drm_framebuffer *fb = fb_helper->fb;
1763 info->pseudo_palette = fb_helper->pseudo_palette;
1764 info->var.xres_virtual = fb->width;
1765 info->var.yres_virtual = fb->height;
1766 info->var.bits_per_pixel = fb->format->cpp[0] * 8;
1767 info->var.accel_flags = FB_ACCELF_TEXT;
1768 info->var.xoffset = 0;
1769 info->var.yoffset = 0;
1770 info->var.activate = FB_ACTIVATE_NOW;
1771 info->var.height = -1;
1772 info->var.width = -1;
1774 switch (fb->format->depth) {
1775 case 8:
1776 info->var.red.offset = 0;
1777 info->var.green.offset = 0;
1778 info->var.blue.offset = 0;
1779 info->var.red.length = 8; /* 8bit DAC */
1780 info->var.green.length = 8;
1781 info->var.blue.length = 8;
1782 info->var.transp.offset = 0;
1783 info->var.transp.length = 0;
1784 break;
1785 case 15:
1786 info->var.red.offset = 10;
1787 info->var.green.offset = 5;
1788 info->var.blue.offset = 0;
1789 info->var.red.length = 5;
1790 info->var.green.length = 5;
1791 info->var.blue.length = 5;
1792 info->var.transp.offset = 15;
1793 info->var.transp.length = 1;
1794 break;
1795 case 16:
1796 info->var.red.offset = 11;
1797 info->var.green.offset = 5;
1798 info->var.blue.offset = 0;
1799 info->var.red.length = 5;
1800 info->var.green.length = 6;
1801 info->var.blue.length = 5;
1802 info->var.transp.offset = 0;
1803 break;
1804 case 24:
1805 info->var.red.offset = 16;
1806 info->var.green.offset = 8;
1807 info->var.blue.offset = 0;
1808 info->var.red.length = 8;
1809 info->var.green.length = 8;
1810 info->var.blue.length = 8;
1811 info->var.transp.offset = 0;
1812 info->var.transp.length = 0;
1813 break;
1814 case 32:
1815 info->var.red.offset = 16;
1816 info->var.green.offset = 8;
1817 info->var.blue.offset = 0;
1818 info->var.red.length = 8;
1819 info->var.green.length = 8;
1820 info->var.blue.length = 8;
1821 info->var.transp.offset = 24;
1822 info->var.transp.length = 8;
1823 break;
1824 default:
1825 break;
1828 info->var.xres = fb_width;
1829 info->var.yres = fb_height;
1831 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1833 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1834 uint32_t maxX,
1835 uint32_t maxY)
1837 struct drm_connector *connector;
1838 int count = 0;
1839 int i;
1841 drm_fb_helper_for_each_connector(fb_helper, i) {
1842 connector = fb_helper->connector_info[i]->connector;
1843 count += connector->funcs->fill_modes(connector, maxX, maxY);
1846 return count;
1849 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1851 struct drm_display_mode *mode;
1853 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1854 if (mode->hdisplay > width ||
1855 mode->vdisplay > height)
1856 continue;
1857 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1858 return mode;
1860 return NULL;
1862 EXPORT_SYMBOL(drm_has_preferred_mode);
1864 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1866 return fb_connector->connector->cmdline_mode.specified;
1869 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn)
1871 struct drm_cmdline_mode *cmdline_mode;
1872 struct drm_display_mode *mode;
1873 bool prefer_non_interlace;
1875 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1876 if (cmdline_mode->specified == false)
1877 return NULL;
1879 /* attempt to find a matching mode in the list of modes
1880 * we have gotten so far, if not add a CVT mode that conforms
1882 if (cmdline_mode->rb || cmdline_mode->margins)
1883 goto create_mode;
1885 prefer_non_interlace = !cmdline_mode->interlace;
1886 again:
1887 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1888 /* check width/height */
1889 if (mode->hdisplay != cmdline_mode->xres ||
1890 mode->vdisplay != cmdline_mode->yres)
1891 continue;
1893 if (cmdline_mode->refresh_specified) {
1894 if (mode->vrefresh != cmdline_mode->refresh)
1895 continue;
1898 if (cmdline_mode->interlace) {
1899 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1900 continue;
1901 } else if (prefer_non_interlace) {
1902 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1903 continue;
1905 return mode;
1908 if (prefer_non_interlace) {
1909 prefer_non_interlace = false;
1910 goto again;
1913 create_mode:
1914 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1915 cmdline_mode);
1916 list_add(&mode->head, &fb_helper_conn->connector->modes);
1917 return mode;
1919 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1921 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1923 bool enable;
1925 if (strict)
1926 enable = connector->status == connector_status_connected;
1927 else
1928 enable = connector->status != connector_status_disconnected;
1930 return enable;
1933 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1934 bool *enabled)
1936 bool any_enabled = false;
1937 struct drm_connector *connector;
1938 int i = 0;
1940 drm_fb_helper_for_each_connector(fb_helper, i) {
1941 connector = fb_helper->connector_info[i]->connector;
1942 enabled[i] = drm_connector_enabled(connector, true);
1943 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1944 enabled[i] ? "yes" : "no");
1945 any_enabled |= enabled[i];
1948 if (any_enabled)
1949 return;
1951 drm_fb_helper_for_each_connector(fb_helper, i) {
1952 connector = fb_helper->connector_info[i]->connector;
1953 enabled[i] = drm_connector_enabled(connector, false);
1957 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1958 struct drm_display_mode **modes,
1959 struct drm_fb_offset *offsets,
1960 bool *enabled, int width, int height)
1962 int count, i, j;
1963 bool can_clone = false;
1964 struct drm_fb_helper_connector *fb_helper_conn;
1965 struct drm_display_mode *dmt_mode, *mode;
1967 /* only contemplate cloning in the single crtc case */
1968 if (fb_helper->crtc_count > 1)
1969 return false;
1971 count = 0;
1972 drm_fb_helper_for_each_connector(fb_helper, i) {
1973 if (enabled[i])
1974 count++;
1977 /* only contemplate cloning if more than one connector is enabled */
1978 if (count <= 1)
1979 return false;
1981 /* check the command line or if nothing common pick 1024x768 */
1982 can_clone = true;
1983 drm_fb_helper_for_each_connector(fb_helper, i) {
1984 if (!enabled[i])
1985 continue;
1986 fb_helper_conn = fb_helper->connector_info[i];
1987 modes[i] = drm_pick_cmdline_mode(fb_helper_conn);
1988 if (!modes[i]) {
1989 can_clone = false;
1990 break;
1992 for (j = 0; j < i; j++) {
1993 if (!enabled[j])
1994 continue;
1995 if (!drm_mode_equal(modes[j], modes[i]))
1996 can_clone = false;
2000 if (can_clone) {
2001 DRM_DEBUG_KMS("can clone using command line\n");
2002 return true;
2005 /* try and find a 1024x768 mode on each connector */
2006 can_clone = true;
2007 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
2009 drm_fb_helper_for_each_connector(fb_helper, i) {
2010 if (!enabled[i])
2011 continue;
2013 fb_helper_conn = fb_helper->connector_info[i];
2014 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
2015 if (drm_mode_equal(mode, dmt_mode))
2016 modes[i] = mode;
2018 if (!modes[i])
2019 can_clone = false;
2022 if (can_clone) {
2023 DRM_DEBUG_KMS("can clone using 1024x768\n");
2024 return true;
2026 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
2027 return false;
2030 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
2031 struct drm_display_mode **modes,
2032 struct drm_fb_offset *offsets,
2033 int idx,
2034 int h_idx, int v_idx)
2036 struct drm_fb_helper_connector *fb_helper_conn;
2037 int i;
2038 int hoffset = 0, voffset = 0;
2040 drm_fb_helper_for_each_connector(fb_helper, i) {
2041 fb_helper_conn = fb_helper->connector_info[i];
2042 if (!fb_helper_conn->connector->has_tile)
2043 continue;
2045 if (!modes[i] && (h_idx || v_idx)) {
2046 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
2047 fb_helper_conn->connector->base.id);
2048 continue;
2050 if (fb_helper_conn->connector->tile_h_loc < h_idx)
2051 hoffset += modes[i]->hdisplay;
2053 if (fb_helper_conn->connector->tile_v_loc < v_idx)
2054 voffset += modes[i]->vdisplay;
2056 offsets[idx].x = hoffset;
2057 offsets[idx].y = voffset;
2058 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
2059 return 0;
2062 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
2063 struct drm_display_mode **modes,
2064 struct drm_fb_offset *offsets,
2065 bool *enabled, int width, int height)
2067 struct drm_fb_helper_connector *fb_helper_conn;
2068 const u64 mask = BIT_ULL(fb_helper->connector_count) - 1;
2069 u64 conn_configured = 0;
2070 int tile_pass = 0;
2071 int i;
2073 retry:
2074 drm_fb_helper_for_each_connector(fb_helper, i) {
2075 fb_helper_conn = fb_helper->connector_info[i];
2077 if (conn_configured & BIT_ULL(i))
2078 continue;
2080 if (enabled[i] == false) {
2081 conn_configured |= BIT_ULL(i);
2082 continue;
2085 /* first pass over all the untiled connectors */
2086 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
2087 continue;
2089 if (tile_pass == 1) {
2090 if (fb_helper_conn->connector->tile_h_loc != 0 ||
2091 fb_helper_conn->connector->tile_v_loc != 0)
2092 continue;
2094 } else {
2095 if (fb_helper_conn->connector->tile_h_loc != tile_pass - 1 &&
2096 fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
2097 /* if this tile_pass doesn't cover any of the tiles - keep going */
2098 continue;
2101 * find the tile offsets for this pass - need to find
2102 * all tiles left and above
2104 drm_get_tile_offsets(fb_helper, modes, offsets,
2105 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
2107 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
2108 fb_helper_conn->connector->base.id);
2110 /* got for command line mode first */
2111 modes[i] = drm_pick_cmdline_mode(fb_helper_conn);
2112 if (!modes[i]) {
2113 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
2114 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
2115 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
2117 /* No preferred modes, pick one off the list */
2118 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
2119 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
2120 break;
2122 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
2123 "none");
2124 conn_configured |= BIT_ULL(i);
2127 if ((conn_configured & mask) != mask) {
2128 tile_pass++;
2129 goto retry;
2131 return true;
2134 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
2135 struct drm_fb_helper_crtc **best_crtcs,
2136 struct drm_display_mode **modes,
2137 int n, int width, int height)
2139 int c, o;
2140 struct drm_connector *connector;
2141 const struct drm_connector_helper_funcs *connector_funcs;
2142 struct drm_encoder *encoder;
2143 int my_score, best_score, score;
2144 struct drm_fb_helper_crtc **crtcs, *crtc;
2145 struct drm_fb_helper_connector *fb_helper_conn;
2147 if (n == fb_helper->connector_count)
2148 return 0;
2150 fb_helper_conn = fb_helper->connector_info[n];
2151 connector = fb_helper_conn->connector;
2153 best_crtcs[n] = NULL;
2154 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
2155 if (modes[n] == NULL)
2156 return best_score;
2158 crtcs = kzalloc(fb_helper->connector_count *
2159 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2160 if (!crtcs)
2161 return best_score;
2163 my_score = 1;
2164 if (connector->status == connector_status_connected)
2165 my_score++;
2166 if (drm_has_cmdline_mode(fb_helper_conn))
2167 my_score++;
2168 if (drm_has_preferred_mode(fb_helper_conn, width, height))
2169 my_score++;
2171 connector_funcs = connector->helper_private;
2174 * If the DRM device implements atomic hooks and ->best_encoder() is
2175 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2176 * helper.
2178 if (drm_drv_uses_atomic_modeset(fb_helper->dev) &&
2179 !connector_funcs->best_encoder)
2180 encoder = drm_atomic_helper_best_encoder(connector);
2181 else
2182 encoder = connector_funcs->best_encoder(connector);
2184 if (!encoder)
2185 goto out;
2188 * select a crtc for this connector and then attempt to configure
2189 * remaining connectors
2191 for (c = 0; c < fb_helper->crtc_count; c++) {
2192 crtc = &fb_helper->crtc_info[c];
2194 if ((encoder->possible_crtcs & (1 << c)) == 0)
2195 continue;
2197 for (o = 0; o < n; o++)
2198 if (best_crtcs[o] == crtc)
2199 break;
2201 if (o < n) {
2202 /* ignore cloning unless only a single crtc */
2203 if (fb_helper->crtc_count > 1)
2204 continue;
2206 if (!drm_mode_equal(modes[o], modes[n]))
2207 continue;
2210 crtcs[n] = crtc;
2211 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2212 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2213 width, height);
2214 if (score > best_score) {
2215 best_score = score;
2216 memcpy(best_crtcs, crtcs,
2217 fb_helper->connector_count *
2218 sizeof(struct drm_fb_helper_crtc *));
2221 out:
2222 kfree(crtcs);
2223 return best_score;
2226 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
2227 u32 width, u32 height)
2229 struct drm_device *dev = fb_helper->dev;
2230 struct drm_fb_helper_crtc **crtcs;
2231 struct drm_display_mode **modes;
2232 struct drm_fb_offset *offsets;
2233 bool *enabled;
2234 int i;
2236 DRM_DEBUG_KMS("\n");
2237 if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
2238 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
2240 /* prevent concurrent modification of connector_count by hotplug */
2241 lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
2243 crtcs = kcalloc(fb_helper->connector_count,
2244 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2245 modes = kcalloc(fb_helper->connector_count,
2246 sizeof(struct drm_display_mode *), GFP_KERNEL);
2247 offsets = kcalloc(fb_helper->connector_count,
2248 sizeof(struct drm_fb_offset), GFP_KERNEL);
2249 enabled = kcalloc(fb_helper->connector_count,
2250 sizeof(bool), GFP_KERNEL);
2251 if (!crtcs || !modes || !enabled || !offsets) {
2252 DRM_ERROR("Memory allocation failed\n");
2253 goto out;
2256 drm_enable_connectors(fb_helper, enabled);
2258 if (!(fb_helper->funcs->initial_config &&
2259 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2260 offsets,
2261 enabled, width, height))) {
2262 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2263 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2264 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2266 if (!drm_target_cloned(fb_helper, modes, offsets,
2267 enabled, width, height) &&
2268 !drm_target_preferred(fb_helper, modes, offsets,
2269 enabled, width, height))
2270 DRM_ERROR("Unable to find initial modes\n");
2272 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2273 width, height);
2275 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2278 /* need to set the modesets up here for use later */
2279 /* fill out the connector<->crtc mappings into the modesets */
2280 for (i = 0; i < fb_helper->crtc_count; i++)
2281 drm_fb_helper_modeset_release(fb_helper,
2282 &fb_helper->crtc_info[i].mode_set);
2284 drm_fb_helper_for_each_connector(fb_helper, i) {
2285 struct drm_display_mode *mode = modes[i];
2286 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2287 struct drm_fb_offset *offset = &offsets[i];
2288 struct drm_mode_set *modeset = &fb_crtc->mode_set;
2290 if (mode && fb_crtc) {
2291 struct drm_connector *connector =
2292 fb_helper->connector_info[i]->connector;
2294 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2295 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2297 fb_crtc->desired_mode = mode;
2298 fb_crtc->x = offset->x;
2299 fb_crtc->y = offset->y;
2300 modeset->mode = drm_mode_duplicate(dev,
2301 fb_crtc->desired_mode);
2302 drm_connector_get(connector);
2303 modeset->connectors[modeset->num_connectors++] = connector;
2304 modeset->fb = fb_helper->fb;
2305 modeset->x = offset->x;
2306 modeset->y = offset->y;
2309 out:
2310 kfree(crtcs);
2311 kfree(modes);
2312 kfree(offsets);
2313 kfree(enabled);
2317 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2318 * @fb_helper: fb_helper device struct
2319 * @bpp_sel: bpp value to use for the framebuffer configuration
2321 * Scans the CRTCs and connectors and tries to put together an initial setup.
2322 * At the moment, this is a cloned configuration across all heads with
2323 * a new framebuffer object as the backing store.
2325 * Note that this also registers the fbdev and so allows userspace to call into
2326 * the driver through the fbdev interfaces.
2328 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2329 * to let the driver allocate and initialize the fbdev info structure and the
2330 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2331 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2332 * values for the fbdev info structure.
2334 * HANG DEBUGGING:
2336 * When you have fbcon support built-in or already loaded, this function will do
2337 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2338 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2339 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2340 * to consoles, not even serial console. This means when your driver crashes,
2341 * you will see absolutely nothing else but a system stuck in this function,
2342 * with no further output. Any kind of printk() you place within your own driver
2343 * or in the drm core modeset code will also never show up.
2345 * Standard debug practice is to run the fbcon setup without taking the
2346 * console_lock as a hack, to be able to see backtraces and crashes on the
2347 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2348 * cmdline option.
2350 * The other option is to just disable fbdev emulation since very likely the
2351 * first modeset from userspace will crash in the same way, and is even easier
2352 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2353 * kernel cmdline option.
2355 * RETURNS:
2356 * Zero if everything went ok, nonzero otherwise.
2358 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2360 struct drm_device *dev = fb_helper->dev;
2361 struct fb_info *info;
2362 int ret;
2364 if (!drm_fbdev_emulation)
2365 return 0;
2367 mutex_lock(&dev->mode_config.mutex);
2368 drm_setup_crtcs(fb_helper,
2369 dev->mode_config.max_width,
2370 dev->mode_config.max_height);
2371 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2372 mutex_unlock(&dev->mode_config.mutex);
2373 if (ret)
2374 return ret;
2376 info = fb_helper->fbdev;
2377 info->var.pixclock = 0;
2378 ret = register_framebuffer(info);
2379 if (ret < 0)
2380 return ret;
2382 dev_info(dev->dev, "fb%d: %s frame buffer device\n",
2383 info->node, info->fix.id);
2385 mutex_lock(&kernel_fb_helper_lock);
2386 if (list_empty(&kernel_fb_helper_list))
2387 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
2389 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
2390 mutex_unlock(&kernel_fb_helper_lock);
2392 return 0;
2394 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2397 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2398 * probing all the outputs attached to the fb
2399 * @fb_helper: the drm_fb_helper
2401 * Scan the connectors attached to the fb_helper and try to put together a
2402 * setup after notification of a change in output configuration.
2404 * Called at runtime, takes the mode config locks to be able to check/change the
2405 * modeset configuration. Must be run from process context (which usually means
2406 * either the output polling work or a work item launched from the driver's
2407 * hotplug interrupt).
2409 * Note that drivers may call this even before calling
2410 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2411 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2412 * not miss any hotplug events.
2414 * RETURNS:
2415 * 0 on success and a non-zero error code otherwise.
2417 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2419 struct drm_device *dev = fb_helper->dev;
2421 if (!drm_fbdev_emulation)
2422 return 0;
2424 mutex_lock(&dev->mode_config.mutex);
2425 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2426 fb_helper->delayed_hotplug = true;
2427 mutex_unlock(&dev->mode_config.mutex);
2428 return 0;
2430 DRM_DEBUG_KMS("\n");
2432 drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height);
2434 mutex_unlock(&dev->mode_config.mutex);
2436 drm_fb_helper_set_par(fb_helper->fbdev);
2438 return 0;
2440 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2442 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2443 * but the module doesn't depend on any fb console symbols. At least
2444 * attempt to load fbcon to avoid leaving the system without a usable console.
2446 int __init drm_fb_helper_modinit(void)
2448 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2449 const char name[] = "fbcon";
2450 struct module *fbcon;
2452 mutex_lock(&module_mutex);
2453 fbcon = find_module(name);
2454 mutex_unlock(&module_mutex);
2456 if (!fbcon)
2457 request_module_nowait(name);
2458 #endif
2459 return 0;
2461 EXPORT_SYMBOL(drm_fb_helper_modinit);