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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>
5 *
6 * DRM framebuffer helper functions
7 *
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.
17 *
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.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32#include <linux/console.h>
33#include <linux/dma-buf.h>
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/slab.h>
37#include <linux/sysrq.h>
38#include <linux/vmalloc.h>
39
40#include <drm/drm_atomic.h>
41#include <drm/drm_crtc.h>
42#include <drm/drm_crtc_helper.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_fb_helper.h>
45#include <drm/drm_fourcc.h>
46#include <drm/drm_print.h>
47#include <drm/drm_vblank.h>
48
49#include "drm_internal.h"
50
51static bool drm_fbdev_emulation = true;
52module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
53MODULE_PARM_DESC(fbdev_emulation,
54 "Enable legacy fbdev emulation [default=true]");
55
56static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
57module_param(drm_fbdev_overalloc, int, 0444);
58MODULE_PARM_DESC(drm_fbdev_overalloc,
59 "Overallocation of the fbdev buffer (%) [default="
60 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
61
62/*
63 * In order to keep user-space compatibility, we want in certain use-cases
64 * to keep leaking the fbdev physical address to the user-space program
65 * handling the fbdev buffer.
66 * This is a bad habit essentially kept into closed source opengl driver
67 * that should really be moved into open-source upstream projects instead
68 * of using legacy physical addresses in user space to communicate with
69 * other out-of-tree kernel modules.
70 *
71 * This module_param *should* be removed as soon as possible and be
72 * considered as a broken and legacy behaviour from a modern fbdev device.
73 */
74#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
75static bool drm_leak_fbdev_smem = false;
76module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
77MODULE_PARM_DESC(drm_leak_fbdev_smem,
78 "Allow unsafe leaking fbdev physical smem address [default=false]");
79#endif
80
81static LIST_HEAD(kernel_fb_helper_list);
82static DEFINE_MUTEX(kernel_fb_helper_lock);
83
84/**
85 * DOC: fbdev helpers
86 *
87 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
88 * mode setting driver. They can be used mostly independently from the crtc
89 * helper functions used by many drivers to implement the kernel mode setting
90 * interfaces.
91 *
92 * Drivers that support a dumb buffer with a virtual address and mmap support,
93 * should try out the generic fbdev emulation using drm_fbdev_generic_setup().
94 *
95 * Setup fbdev emulation by calling drm_fb_helper_fbdev_setup() and tear it
96 * down by calling drm_fb_helper_fbdev_teardown().
97 *
98 * At runtime drivers should restore the fbdev console by using
99 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
100 * They should also notify the fb helper code from updates to the output
101 * configuration by using drm_fb_helper_output_poll_changed() as their
102 * &drm_mode_config_funcs.output_poll_changed callback.
103 *
104 * For suspend/resume consider using drm_mode_config_helper_suspend() and
105 * drm_mode_config_helper_resume() which takes care of fbdev as well.
106 *
107 * All other functions exported by the fb helper library can be used to
108 * implement the fbdev driver interface by the driver.
109 *
110 * It is possible, though perhaps somewhat tricky, to implement race-free
111 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
112 * helper must be called first to initialize the minimum required to make
113 * hotplug detection work. Drivers also need to make sure to properly set up
114 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
115 * it is safe to enable interrupts and start processing hotplug events. At the
116 * same time, drivers should initialize all modeset objects such as CRTCs,
117 * encoders and connectors. To finish up the fbdev helper initialization, the
118 * drm_fb_helper_init() function is called. To probe for all attached displays
119 * and set up an initial configuration using the detected hardware, drivers
120 * should call drm_fb_helper_initial_config().
121 *
122 * If &drm_framebuffer_funcs.dirty is set, the
123 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
124 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
125 * away. This worker then calls the dirty() function ensuring that it will
126 * always run in process context since the fb_*() function could be running in
127 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
128 * callback it will also schedule dirty_work with the damage collected from the
129 * mmap page writes. Drivers can use drm_fb_helper_defio_init() to setup
130 * deferred I/O (coupled with drm_fb_helper_fbdev_teardown()).
131 */
132
133static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
134{
135 uint16_t *r_base, *g_base, *b_base;
136
137 if (crtc->funcs->gamma_set == NULL)
138 return;
139
140 r_base = crtc->gamma_store;
141 g_base = r_base + crtc->gamma_size;
142 b_base = g_base + crtc->gamma_size;
143
144 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
145 crtc->gamma_size, NULL);
146}
147
148/**
149 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
150 * @info: fbdev registered by the helper
151 */
152int drm_fb_helper_debug_enter(struct fb_info *info)
153{
154 struct drm_fb_helper *helper = info->par;
155 const struct drm_crtc_helper_funcs *funcs;
156 struct drm_mode_set *mode_set;
157
158 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
159 mutex_lock(&helper->client.modeset_mutex);
160 drm_client_for_each_modeset(mode_set, &helper->client) {
161 if (!mode_set->crtc->enabled)
162 continue;
163
164 funcs = mode_set->crtc->helper_private;
165 if (funcs->mode_set_base_atomic == NULL)
166 continue;
167
168 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
169 continue;
170
171 funcs->mode_set_base_atomic(mode_set->crtc,
172 mode_set->fb,
173 mode_set->x,
174 mode_set->y,
175 ENTER_ATOMIC_MODE_SET);
176 }
177 mutex_unlock(&helper->client.modeset_mutex);
178 }
179
180 return 0;
181}
182EXPORT_SYMBOL(drm_fb_helper_debug_enter);
183
184/**
185 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
186 * @info: fbdev registered by the helper
187 */
188int drm_fb_helper_debug_leave(struct fb_info *info)
189{
190 struct drm_fb_helper *helper = info->par;
191 struct drm_client_dev *client = &helper->client;
192 struct drm_crtc *crtc;
193 const struct drm_crtc_helper_funcs *funcs;
194 struct drm_mode_set *mode_set;
195 struct drm_framebuffer *fb;
196
197 mutex_lock(&client->modeset_mutex);
198 drm_client_for_each_modeset(mode_set, client) {
199 crtc = mode_set->crtc;
200 if (drm_drv_uses_atomic_modeset(crtc->dev))
201 continue;
202
203 funcs = crtc->helper_private;
204 fb = crtc->primary->fb;
205
206 if (!crtc->enabled)
207 continue;
208
209 if (!fb) {
210 DRM_ERROR("no fb to restore??\n");
211 continue;
212 }
213
214 if (funcs->mode_set_base_atomic == NULL)
215 continue;
216
217 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
218 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
219 crtc->y, LEAVE_ATOMIC_MODE_SET);
220 }
221 mutex_unlock(&client->modeset_mutex);
222
223 return 0;
224}
225EXPORT_SYMBOL(drm_fb_helper_debug_leave);
226
227/**
228 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
229 * @fb_helper: driver-allocated fbdev helper, can be NULL
230 *
231 * This should be called from driver's drm &drm_driver.lastclose callback
232 * when implementing an fbcon on top of kms using this helper. This ensures that
233 * the user isn't greeted with a black screen when e.g. X dies.
234 *
235 * RETURNS:
236 * Zero if everything went ok, negative error code otherwise.
237 */
238int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
239{
240 bool do_delayed;
241 int ret;
242
243 if (!drm_fbdev_emulation || !fb_helper)
244 return -ENODEV;
245
246 if (READ_ONCE(fb_helper->deferred_setup))
247 return 0;
248
249 mutex_lock(&fb_helper->lock);
250 /*
251 * TODO:
252 * We should bail out here if there is a master by dropping _force.
253 * Currently these igt tests fail if we do that:
254 * - kms_fbcon_fbt@psr
255 * - kms_fbcon_fbt@psr-suspend
256 *
257 * So first these tests need to be fixed so they drop master or don't
258 * have an fd open.
259 */
260 ret = drm_client_modeset_commit_force(&fb_helper->client);
261
262 do_delayed = fb_helper->delayed_hotplug;
263 if (do_delayed)
264 fb_helper->delayed_hotplug = false;
265 mutex_unlock(&fb_helper->lock);
266
267 if (do_delayed)
268 drm_fb_helper_hotplug_event(fb_helper);
269
270 return ret;
271}
272EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
273
274#ifdef CONFIG_MAGIC_SYSRQ
275/*
276 * restore fbcon display for all kms driver's using this helper, used for sysrq
277 * and panic handling.
278 */
279static bool drm_fb_helper_force_kernel_mode(void)
280{
281 bool ret, error = false;
282 struct drm_fb_helper *helper;
283
284 if (list_empty(&kernel_fb_helper_list))
285 return false;
286
287 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
288 struct drm_device *dev = helper->dev;
289
290 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
291 continue;
292
293 mutex_lock(&helper->lock);
294 ret = drm_client_modeset_commit_force(&helper->client);
295 if (ret)
296 error = true;
297 mutex_unlock(&helper->lock);
298 }
299 return error;
300}
301
302static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
303{
304 bool ret;
305
306 ret = drm_fb_helper_force_kernel_mode();
307 if (ret == true)
308 DRM_ERROR("Failed to restore crtc configuration\n");
309}
310static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
311
312static void drm_fb_helper_sysrq(int dummy1)
313{
314 schedule_work(&drm_fb_helper_restore_work);
315}
316
317static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
318 .handler = drm_fb_helper_sysrq,
319 .help_msg = "force-fb(V)",
320 .action_msg = "Restore framebuffer console",
321};
322#else
323static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
324#endif
325
326static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
327{
328 struct drm_fb_helper *fb_helper = info->par;
329
330 mutex_lock(&fb_helper->lock);
331 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
332 mutex_unlock(&fb_helper->lock);
333}
334
335/**
336 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
337 * @blank: desired blanking state
338 * @info: fbdev registered by the helper
339 */
340int drm_fb_helper_blank(int blank, struct fb_info *info)
341{
342 if (oops_in_progress)
343 return -EBUSY;
344
345 switch (blank) {
346 /* Display: On; HSync: On, VSync: On */
347 case FB_BLANK_UNBLANK:
348 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
349 break;
350 /* Display: Off; HSync: On, VSync: On */
351 case FB_BLANK_NORMAL:
352 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
353 break;
354 /* Display: Off; HSync: Off, VSync: On */
355 case FB_BLANK_HSYNC_SUSPEND:
356 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
357 break;
358 /* Display: Off; HSync: On, VSync: Off */
359 case FB_BLANK_VSYNC_SUSPEND:
360 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
361 break;
362 /* Display: Off; HSync: Off, VSync: Off */
363 case FB_BLANK_POWERDOWN:
364 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
365 break;
366 }
367 return 0;
368}
369EXPORT_SYMBOL(drm_fb_helper_blank);
370
371static void drm_fb_helper_resume_worker(struct work_struct *work)
372{
373 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
374 resume_work);
375
376 console_lock();
377 fb_set_suspend(helper->fbdev, 0);
378 console_unlock();
379}
380
381static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
382 struct drm_clip_rect *clip)
383{
384 struct drm_framebuffer *fb = fb_helper->fb;
385 unsigned int cpp = fb->format->cpp[0];
386 size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
387 void *src = fb_helper->fbdev->screen_buffer + offset;
388 void *dst = fb_helper->buffer->vaddr + offset;
389 size_t len = (clip->x2 - clip->x1) * cpp;
390 unsigned int y;
391
392 for (y = clip->y1; y < clip->y2; y++) {
393 memcpy(dst, src, len);
394 src += fb->pitches[0];
395 dst += fb->pitches[0];
396 }
397}
398
399static void drm_fb_helper_dirty_work(struct work_struct *work)
400{
401 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
402 dirty_work);
403 struct drm_clip_rect *clip = &helper->dirty_clip;
404 struct drm_clip_rect clip_copy;
405 unsigned long flags;
406 void *vaddr;
407
408 spin_lock_irqsave(&helper->dirty_lock, flags);
409 clip_copy = *clip;
410 clip->x1 = clip->y1 = ~0;
411 clip->x2 = clip->y2 = 0;
412 spin_unlock_irqrestore(&helper->dirty_lock, flags);
413
414 /* call dirty callback only when it has been really touched */
415 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
416
417 /* Generic fbdev uses a shadow buffer */
418 if (helper->buffer) {
419 vaddr = drm_client_buffer_vmap(helper->buffer);
420 if (IS_ERR(vaddr))
421 return;
422 drm_fb_helper_dirty_blit_real(helper, &clip_copy);
423 }
424 if (helper->fb->funcs->dirty)
425 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
426 &clip_copy, 1);
427
428 if (helper->buffer)
429 drm_client_buffer_vunmap(helper->buffer);
430 }
431}
432
433/**
434 * drm_fb_helper_prepare - setup a drm_fb_helper structure
435 * @dev: DRM device
436 * @helper: driver-allocated fbdev helper structure to set up
437 * @funcs: pointer to structure of functions associate with this helper
438 *
439 * Sets up the bare minimum to make the framebuffer helper usable. This is
440 * useful to implement race-free initialization of the polling helpers.
441 */
442void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
443 const struct drm_fb_helper_funcs *funcs)
444{
445 INIT_LIST_HEAD(&helper->kernel_fb_list);
446 spin_lock_init(&helper->dirty_lock);
447 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
448 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
449 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
450 mutex_init(&helper->lock);
451 helper->funcs = funcs;
452 helper->dev = dev;
453}
454EXPORT_SYMBOL(drm_fb_helper_prepare);
455
456/**
457 * drm_fb_helper_init - initialize a &struct drm_fb_helper
458 * @dev: drm device
459 * @fb_helper: driver-allocated fbdev helper structure to initialize
460 * @max_conn_count: max connector count (not used)
461 *
462 * This allocates the structures for the fbdev helper with the given limits.
463 * Note that this won't yet touch the hardware (through the driver interfaces)
464 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
465 * to allow driver writes more control over the exact init sequence.
466 *
467 * Drivers must call drm_fb_helper_prepare() before calling this function.
468 *
469 * RETURNS:
470 * Zero if everything went ok, nonzero otherwise.
471 */
472int drm_fb_helper_init(struct drm_device *dev,
473 struct drm_fb_helper *fb_helper,
474 int max_conn_count)
475{
476 int ret;
477
478 if (!drm_fbdev_emulation) {
479 dev->fb_helper = fb_helper;
480 return 0;
481 }
482
483 /*
484 * If this is not the generic fbdev client, initialize a drm_client
485 * without callbacks so we can use the modesets.
486 */
487 if (!fb_helper->client.funcs) {
488 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
489 if (ret)
490 return ret;
491 }
492
493 dev->fb_helper = fb_helper;
494
495 return 0;
496}
497EXPORT_SYMBOL(drm_fb_helper_init);
498
499/**
500 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
501 * @fb_helper: driver-allocated fbdev helper
502 *
503 * A helper to alloc fb_info and the members cmap and apertures. Called
504 * by the driver within the fb_probe fb_helper callback function. Drivers do not
505 * need to release the allocated fb_info structure themselves, this is
506 * automatically done when calling drm_fb_helper_fini().
507 *
508 * RETURNS:
509 * fb_info pointer if things went okay, pointer containing error code
510 * otherwise
511 */
512struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
513{
514 struct device *dev = fb_helper->dev->dev;
515 struct fb_info *info;
516 int ret;
517
518 info = framebuffer_alloc(0, dev);
519 if (!info)
520 return ERR_PTR(-ENOMEM);
521
522 ret = fb_alloc_cmap(&info->cmap, 256, 0);
523 if (ret)
524 goto err_release;
525
526 info->apertures = alloc_apertures(1);
527 if (!info->apertures) {
528 ret = -ENOMEM;
529 goto err_free_cmap;
530 }
531
532 fb_helper->fbdev = info;
533 info->skip_vt_switch = true;
534
535 return info;
536
537err_free_cmap:
538 fb_dealloc_cmap(&info->cmap);
539err_release:
540 framebuffer_release(info);
541 return ERR_PTR(ret);
542}
543EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
544
545/**
546 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
547 * @fb_helper: driver-allocated fbdev helper, can be NULL
548 *
549 * A wrapper around unregister_framebuffer, to release the fb_info
550 * framebuffer device. This must be called before releasing all resources for
551 * @fb_helper by calling drm_fb_helper_fini().
552 */
553void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
554{
555 if (fb_helper && fb_helper->fbdev)
556 unregister_framebuffer(fb_helper->fbdev);
557}
558EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
559
560/**
561 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
562 * @fb_helper: driver-allocated fbdev helper, can be NULL
563 *
564 * This cleans up all remaining resources associated with @fb_helper. Must be
565 * called after drm_fb_helper_unlink_fbi() was called.
566 */
567void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
568{
569 struct fb_info *info;
570
571 if (!fb_helper)
572 return;
573
574 fb_helper->dev->fb_helper = NULL;
575
576 if (!drm_fbdev_emulation)
577 return;
578
579 cancel_work_sync(&fb_helper->resume_work);
580 cancel_work_sync(&fb_helper->dirty_work);
581
582 info = fb_helper->fbdev;
583 if (info) {
584 if (info->cmap.len)
585 fb_dealloc_cmap(&info->cmap);
586 framebuffer_release(info);
587 }
588 fb_helper->fbdev = NULL;
589
590 mutex_lock(&kernel_fb_helper_lock);
591 if (!list_empty(&fb_helper->kernel_fb_list)) {
592 list_del(&fb_helper->kernel_fb_list);
593 if (list_empty(&kernel_fb_helper_list))
594 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
595 }
596 mutex_unlock(&kernel_fb_helper_lock);
597
598 mutex_destroy(&fb_helper->lock);
599
600 if (!fb_helper->client.funcs)
601 drm_client_release(&fb_helper->client);
602}
603EXPORT_SYMBOL(drm_fb_helper_fini);
604
605/**
606 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
607 * @fb_helper: driver-allocated fbdev helper, can be NULL
608 *
609 * A wrapper around unlink_framebuffer implemented by fbdev core
610 */
611void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
612{
613 if (fb_helper && fb_helper->fbdev)
614 unlink_framebuffer(fb_helper->fbdev);
615}
616EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
617
618static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper)
619{
620 struct drm_device *dev = fb_helper->dev;
621 struct drm_framebuffer *fb = fb_helper->fb;
622
623 return dev->mode_config.prefer_shadow_fbdev ||
624 dev->mode_config.prefer_shadow ||
625 fb->funcs->dirty;
626}
627
628static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
629 u32 width, u32 height)
630{
631 struct drm_fb_helper *helper = info->par;
632 struct drm_clip_rect *clip = &helper->dirty_clip;
633 unsigned long flags;
634
635 if (!drm_fbdev_use_shadow_fb(helper))
636 return;
637
638 spin_lock_irqsave(&helper->dirty_lock, flags);
639 clip->x1 = min_t(u32, clip->x1, x);
640 clip->y1 = min_t(u32, clip->y1, y);
641 clip->x2 = max_t(u32, clip->x2, x + width);
642 clip->y2 = max_t(u32, clip->y2, y + height);
643 spin_unlock_irqrestore(&helper->dirty_lock, flags);
644
645 schedule_work(&helper->dirty_work);
646}
647
648/**
649 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
650 * @info: fb_info struct pointer
651 * @pagelist: list of dirty mmap framebuffer pages
652 *
653 * This function is used as the &fb_deferred_io.deferred_io
654 * callback function for flushing the fbdev mmap writes.
655 */
656void drm_fb_helper_deferred_io(struct fb_info *info,
657 struct list_head *pagelist)
658{
659 unsigned long start, end, min, max;
660 struct page *page;
661 u32 y1, y2;
662
663 min = ULONG_MAX;
664 max = 0;
665 list_for_each_entry(page, pagelist, lru) {
666 start = page->index << PAGE_SHIFT;
667 end = start + PAGE_SIZE - 1;
668 min = min(min, start);
669 max = max(max, end);
670 }
671
672 if (min < max) {
673 y1 = min / info->fix.line_length;
674 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
675 info->var.yres);
676 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
677 }
678}
679EXPORT_SYMBOL(drm_fb_helper_deferred_io);
680
681/**
682 * drm_fb_helper_defio_init - fbdev deferred I/O initialization
683 * @fb_helper: driver-allocated fbdev helper
684 *
685 * This function allocates &fb_deferred_io, sets callback to
686 * drm_fb_helper_deferred_io(), delay to 50ms and calls fb_deferred_io_init().
687 * It should be called from the &drm_fb_helper_funcs->fb_probe callback.
688 * drm_fb_helper_fbdev_teardown() cleans up deferred I/O.
689 *
690 * NOTE: A copy of &fb_ops is made and assigned to &info->fbops. This is done
691 * because fb_deferred_io_cleanup() clears &fbops->fb_mmap and would thereby
692 * affect other instances of that &fb_ops.
693 *
694 * Returns:
695 * 0 on success or a negative error code on failure.
696 */
697int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
698{
699 struct fb_info *info = fb_helper->fbdev;
700 struct fb_deferred_io *fbdefio;
701 struct fb_ops *fbops;
702
703 fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
704 fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
705 if (!fbdefio || !fbops) {
706 kfree(fbdefio);
707 kfree(fbops);
708 return -ENOMEM;
709 }
710
711 info->fbdefio = fbdefio;
712 fbdefio->delay = msecs_to_jiffies(50);
713 fbdefio->deferred_io = drm_fb_helper_deferred_io;
714
715 *fbops = *info->fbops;
716 info->fbops = fbops;
717
718 fb_deferred_io_init(info);
719
720 return 0;
721}
722EXPORT_SYMBOL(drm_fb_helper_defio_init);
723
724/**
725 * drm_fb_helper_sys_read - wrapper around fb_sys_read
726 * @info: fb_info struct pointer
727 * @buf: userspace buffer to read from framebuffer memory
728 * @count: number of bytes to read from framebuffer memory
729 * @ppos: read offset within framebuffer memory
730 *
731 * A wrapper around fb_sys_read implemented by fbdev core
732 */
733ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
734 size_t count, loff_t *ppos)
735{
736 return fb_sys_read(info, buf, count, ppos);
737}
738EXPORT_SYMBOL(drm_fb_helper_sys_read);
739
740/**
741 * drm_fb_helper_sys_write - wrapper around fb_sys_write
742 * @info: fb_info struct pointer
743 * @buf: userspace buffer to write to framebuffer memory
744 * @count: number of bytes to write to framebuffer memory
745 * @ppos: write offset within framebuffer memory
746 *
747 * A wrapper around fb_sys_write implemented by fbdev core
748 */
749ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
750 size_t count, loff_t *ppos)
751{
752 ssize_t ret;
753
754 ret = fb_sys_write(info, buf, count, ppos);
755 if (ret > 0)
756 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
757 info->var.yres);
758
759 return ret;
760}
761EXPORT_SYMBOL(drm_fb_helper_sys_write);
762
763/**
764 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
765 * @info: fbdev registered by the helper
766 * @rect: info about rectangle to fill
767 *
768 * A wrapper around sys_fillrect implemented by fbdev core
769 */
770void drm_fb_helper_sys_fillrect(struct fb_info *info,
771 const struct fb_fillrect *rect)
772{
773 sys_fillrect(info, rect);
774 drm_fb_helper_dirty(info, rect->dx, rect->dy,
775 rect->width, rect->height);
776}
777EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
778
779/**
780 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
781 * @info: fbdev registered by the helper
782 * @area: info about area to copy
783 *
784 * A wrapper around sys_copyarea implemented by fbdev core
785 */
786void drm_fb_helper_sys_copyarea(struct fb_info *info,
787 const struct fb_copyarea *area)
788{
789 sys_copyarea(info, area);
790 drm_fb_helper_dirty(info, area->dx, area->dy,
791 area->width, area->height);
792}
793EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
794
795/**
796 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
797 * @info: fbdev registered by the helper
798 * @image: info about image to blit
799 *
800 * A wrapper around sys_imageblit implemented by fbdev core
801 */
802void drm_fb_helper_sys_imageblit(struct fb_info *info,
803 const struct fb_image *image)
804{
805 sys_imageblit(info, image);
806 drm_fb_helper_dirty(info, image->dx, image->dy,
807 image->width, image->height);
808}
809EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
810
811/**
812 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
813 * @info: fbdev registered by the helper
814 * @rect: info about rectangle to fill
815 *
816 * A wrapper around cfb_fillrect implemented by fbdev core
817 */
818void drm_fb_helper_cfb_fillrect(struct fb_info *info,
819 const struct fb_fillrect *rect)
820{
821 cfb_fillrect(info, rect);
822 drm_fb_helper_dirty(info, rect->dx, rect->dy,
823 rect->width, rect->height);
824}
825EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
826
827/**
828 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
829 * @info: fbdev registered by the helper
830 * @area: info about area to copy
831 *
832 * A wrapper around cfb_copyarea implemented by fbdev core
833 */
834void drm_fb_helper_cfb_copyarea(struct fb_info *info,
835 const struct fb_copyarea *area)
836{
837 cfb_copyarea(info, area);
838 drm_fb_helper_dirty(info, area->dx, area->dy,
839 area->width, area->height);
840}
841EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
842
843/**
844 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
845 * @info: fbdev registered by the helper
846 * @image: info about image to blit
847 *
848 * A wrapper around cfb_imageblit implemented by fbdev core
849 */
850void drm_fb_helper_cfb_imageblit(struct fb_info *info,
851 const struct fb_image *image)
852{
853 cfb_imageblit(info, image);
854 drm_fb_helper_dirty(info, image->dx, image->dy,
855 image->width, image->height);
856}
857EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
858
859/**
860 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
861 * @fb_helper: driver-allocated fbdev helper, can be NULL
862 * @suspend: whether to suspend or resume
863 *
864 * A wrapper around fb_set_suspend implemented by fbdev core.
865 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
866 * the lock yourself
867 */
868void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
869{
870 if (fb_helper && fb_helper->fbdev)
871 fb_set_suspend(fb_helper->fbdev, suspend);
872}
873EXPORT_SYMBOL(drm_fb_helper_set_suspend);
874
875/**
876 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
877 * takes the console lock
878 * @fb_helper: driver-allocated fbdev helper, can be NULL
879 * @suspend: whether to suspend or resume
880 *
881 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
882 * isn't available on resume, a worker is tasked with waiting for the lock
883 * to become available. The console lock can be pretty contented on resume
884 * due to all the printk activity.
885 *
886 * This function can be called multiple times with the same state since
887 * &fb_info.state is checked to see if fbdev is running or not before locking.
888 *
889 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
890 */
891void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
892 bool suspend)
893{
894 if (!fb_helper || !fb_helper->fbdev)
895 return;
896
897 /* make sure there's no pending/ongoing resume */
898 flush_work(&fb_helper->resume_work);
899
900 if (suspend) {
901 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
902 return;
903
904 console_lock();
905
906 } else {
907 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
908 return;
909
910 if (!console_trylock()) {
911 schedule_work(&fb_helper->resume_work);
912 return;
913 }
914 }
915
916 fb_set_suspend(fb_helper->fbdev, suspend);
917 console_unlock();
918}
919EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
920
921static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
922{
923 u32 *palette = (u32 *)info->pseudo_palette;
924 int i;
925
926 if (cmap->start + cmap->len > 16)
927 return -EINVAL;
928
929 for (i = 0; i < cmap->len; ++i) {
930 u16 red = cmap->red[i];
931 u16 green = cmap->green[i];
932 u16 blue = cmap->blue[i];
933 u32 value;
934
935 red >>= 16 - info->var.red.length;
936 green >>= 16 - info->var.green.length;
937 blue >>= 16 - info->var.blue.length;
938 value = (red << info->var.red.offset) |
939 (green << info->var.green.offset) |
940 (blue << info->var.blue.offset);
941 if (info->var.transp.length > 0) {
942 u32 mask = (1 << info->var.transp.length) - 1;
943
944 mask <<= info->var.transp.offset;
945 value |= mask;
946 }
947 palette[cmap->start + i] = value;
948 }
949
950 return 0;
951}
952
953static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
954{
955 struct drm_fb_helper *fb_helper = info->par;
956 struct drm_mode_set *modeset;
957 struct drm_crtc *crtc;
958 u16 *r, *g, *b;
959 int ret = 0;
960
961 drm_modeset_lock_all(fb_helper->dev);
962 drm_client_for_each_modeset(modeset, &fb_helper->client) {
963 crtc = modeset->crtc;
964 if (!crtc->funcs->gamma_set || !crtc->gamma_size)
965 return -EINVAL;
966
967 if (cmap->start + cmap->len > crtc->gamma_size)
968 return -EINVAL;
969
970 r = crtc->gamma_store;
971 g = r + crtc->gamma_size;
972 b = g + crtc->gamma_size;
973
974 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
975 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
976 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
977
978 ret = crtc->funcs->gamma_set(crtc, r, g, b,
979 crtc->gamma_size, NULL);
980 if (ret)
981 return ret;
982 }
983 drm_modeset_unlock_all(fb_helper->dev);
984
985 return ret;
986}
987
988static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
989 struct fb_cmap *cmap)
990{
991 struct drm_device *dev = crtc->dev;
992 struct drm_property_blob *gamma_lut;
993 struct drm_color_lut *lut;
994 int size = crtc->gamma_size;
995 int i;
996
997 if (!size || cmap->start + cmap->len > size)
998 return ERR_PTR(-EINVAL);
999
1000 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
1001 if (IS_ERR(gamma_lut))
1002 return gamma_lut;
1003
1004 lut = gamma_lut->data;
1005 if (cmap->start || cmap->len != size) {
1006 u16 *r = crtc->gamma_store;
1007 u16 *g = r + crtc->gamma_size;
1008 u16 *b = g + crtc->gamma_size;
1009
1010 for (i = 0; i < cmap->start; i++) {
1011 lut[i].red = r[i];
1012 lut[i].green = g[i];
1013 lut[i].blue = b[i];
1014 }
1015 for (i = cmap->start + cmap->len; i < size; i++) {
1016 lut[i].red = r[i];
1017 lut[i].green = g[i];
1018 lut[i].blue = b[i];
1019 }
1020 }
1021
1022 for (i = 0; i < cmap->len; i++) {
1023 lut[cmap->start + i].red = cmap->red[i];
1024 lut[cmap->start + i].green = cmap->green[i];
1025 lut[cmap->start + i].blue = cmap->blue[i];
1026 }
1027
1028 return gamma_lut;
1029}
1030
1031static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
1032{
1033 struct drm_fb_helper *fb_helper = info->par;
1034 struct drm_device *dev = fb_helper->dev;
1035 struct drm_property_blob *gamma_lut = NULL;
1036 struct drm_modeset_acquire_ctx ctx;
1037 struct drm_crtc_state *crtc_state;
1038 struct drm_atomic_state *state;
1039 struct drm_mode_set *modeset;
1040 struct drm_crtc *crtc;
1041 u16 *r, *g, *b;
1042 bool replaced;
1043 int ret = 0;
1044
1045 drm_modeset_acquire_init(&ctx, 0);
1046
1047 state = drm_atomic_state_alloc(dev);
1048 if (!state) {
1049 ret = -ENOMEM;
1050 goto out_ctx;
1051 }
1052
1053 state->acquire_ctx = &ctx;
1054retry:
1055 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1056 crtc = modeset->crtc;
1057
1058 if (!gamma_lut)
1059 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
1060 if (IS_ERR(gamma_lut)) {
1061 ret = PTR_ERR(gamma_lut);
1062 gamma_lut = NULL;
1063 goto out_state;
1064 }
1065
1066 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1067 if (IS_ERR(crtc_state)) {
1068 ret = PTR_ERR(crtc_state);
1069 goto out_state;
1070 }
1071
1072 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
1073 NULL);
1074 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
1075 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
1076 gamma_lut);
1077 crtc_state->color_mgmt_changed |= replaced;
1078 }
1079
1080 ret = drm_atomic_commit(state);
1081 if (ret)
1082 goto out_state;
1083
1084 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1085 crtc = modeset->crtc;
1086
1087 r = crtc->gamma_store;
1088 g = r + crtc->gamma_size;
1089 b = g + crtc->gamma_size;
1090
1091 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1092 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1093 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1094 }
1095
1096out_state:
1097 if (ret == -EDEADLK)
1098 goto backoff;
1099
1100 drm_property_blob_put(gamma_lut);
1101 drm_atomic_state_put(state);
1102out_ctx:
1103 drm_modeset_drop_locks(&ctx);
1104 drm_modeset_acquire_fini(&ctx);
1105
1106 return ret;
1107
1108backoff:
1109 drm_atomic_state_clear(state);
1110 drm_modeset_backoff(&ctx);
1111 goto retry;
1112}
1113
1114/**
1115 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1116 * @cmap: cmap to set
1117 * @info: fbdev registered by the helper
1118 */
1119int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1120{
1121 struct drm_fb_helper *fb_helper = info->par;
1122 struct drm_device *dev = fb_helper->dev;
1123 int ret;
1124
1125 if (oops_in_progress)
1126 return -EBUSY;
1127
1128 mutex_lock(&fb_helper->lock);
1129
1130 if (!drm_master_internal_acquire(dev)) {
1131 ret = -EBUSY;
1132 goto unlock;
1133 }
1134
1135 mutex_lock(&fb_helper->client.modeset_mutex);
1136 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1137 ret = setcmap_pseudo_palette(cmap, info);
1138 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1139 ret = setcmap_atomic(cmap, info);
1140 else
1141 ret = setcmap_legacy(cmap, info);
1142 mutex_unlock(&fb_helper->client.modeset_mutex);
1143
1144 drm_master_internal_release(dev);
1145unlock:
1146 mutex_unlock(&fb_helper->lock);
1147
1148 return ret;
1149}
1150EXPORT_SYMBOL(drm_fb_helper_setcmap);
1151
1152/**
1153 * drm_fb_helper_ioctl - legacy ioctl implementation
1154 * @info: fbdev registered by the helper
1155 * @cmd: ioctl command
1156 * @arg: ioctl argument
1157 *
1158 * A helper to implement the standard fbdev ioctl. Only
1159 * FBIO_WAITFORVSYNC is implemented for now.
1160 */
1161int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1162 unsigned long arg)
1163{
1164 struct drm_fb_helper *fb_helper = info->par;
1165 struct drm_device *dev = fb_helper->dev;
1166 struct drm_crtc *crtc;
1167 int ret = 0;
1168
1169 mutex_lock(&fb_helper->lock);
1170 if (!drm_master_internal_acquire(dev)) {
1171 ret = -EBUSY;
1172 goto unlock;
1173 }
1174
1175 switch (cmd) {
1176 case FBIO_WAITFORVSYNC:
1177 /*
1178 * Only consider the first CRTC.
1179 *
1180 * This ioctl is supposed to take the CRTC number as
1181 * an argument, but in fbdev times, what that number
1182 * was supposed to be was quite unclear, different
1183 * drivers were passing that argument differently
1184 * (some by reference, some by value), and most of the
1185 * userspace applications were just hardcoding 0 as an
1186 * argument.
1187 *
1188 * The first CRTC should be the integrated panel on
1189 * most drivers, so this is the best choice we can
1190 * make. If we're not smart enough here, one should
1191 * just consider switch the userspace to KMS.
1192 */
1193 crtc = fb_helper->client.modesets[0].crtc;
1194
1195 /*
1196 * Only wait for a vblank event if the CRTC is
1197 * enabled, otherwise just don't do anythintg,
1198 * not even report an error.
1199 */
1200 ret = drm_crtc_vblank_get(crtc);
1201 if (!ret) {
1202 drm_crtc_wait_one_vblank(crtc);
1203 drm_crtc_vblank_put(crtc);
1204 }
1205
1206 ret = 0;
1207 break;
1208 default:
1209 ret = -ENOTTY;
1210 }
1211
1212 drm_master_internal_release(dev);
1213unlock:
1214 mutex_unlock(&fb_helper->lock);
1215 return ret;
1216}
1217EXPORT_SYMBOL(drm_fb_helper_ioctl);
1218
1219static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1220 const struct fb_var_screeninfo *var_2)
1221{
1222 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1223 var_1->grayscale == var_2->grayscale &&
1224 var_1->red.offset == var_2->red.offset &&
1225 var_1->red.length == var_2->red.length &&
1226 var_1->red.msb_right == var_2->red.msb_right &&
1227 var_1->green.offset == var_2->green.offset &&
1228 var_1->green.length == var_2->green.length &&
1229 var_1->green.msb_right == var_2->green.msb_right &&
1230 var_1->blue.offset == var_2->blue.offset &&
1231 var_1->blue.length == var_2->blue.length &&
1232 var_1->blue.msb_right == var_2->blue.msb_right &&
1233 var_1->transp.offset == var_2->transp.offset &&
1234 var_1->transp.length == var_2->transp.length &&
1235 var_1->transp.msb_right == var_2->transp.msb_right;
1236}
1237
1238static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1239 u8 depth)
1240{
1241 switch (depth) {
1242 case 8:
1243 var->red.offset = 0;
1244 var->green.offset = 0;
1245 var->blue.offset = 0;
1246 var->red.length = 8; /* 8bit DAC */
1247 var->green.length = 8;
1248 var->blue.length = 8;
1249 var->transp.offset = 0;
1250 var->transp.length = 0;
1251 break;
1252 case 15:
1253 var->red.offset = 10;
1254 var->green.offset = 5;
1255 var->blue.offset = 0;
1256 var->red.length = 5;
1257 var->green.length = 5;
1258 var->blue.length = 5;
1259 var->transp.offset = 15;
1260 var->transp.length = 1;
1261 break;
1262 case 16:
1263 var->red.offset = 11;
1264 var->green.offset = 5;
1265 var->blue.offset = 0;
1266 var->red.length = 5;
1267 var->green.length = 6;
1268 var->blue.length = 5;
1269 var->transp.offset = 0;
1270 break;
1271 case 24:
1272 var->red.offset = 16;
1273 var->green.offset = 8;
1274 var->blue.offset = 0;
1275 var->red.length = 8;
1276 var->green.length = 8;
1277 var->blue.length = 8;
1278 var->transp.offset = 0;
1279 var->transp.length = 0;
1280 break;
1281 case 32:
1282 var->red.offset = 16;
1283 var->green.offset = 8;
1284 var->blue.offset = 0;
1285 var->red.length = 8;
1286 var->green.length = 8;
1287 var->blue.length = 8;
1288 var->transp.offset = 24;
1289 var->transp.length = 8;
1290 break;
1291 default:
1292 break;
1293 }
1294}
1295
1296/**
1297 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1298 * @var: screeninfo to check
1299 * @info: fbdev registered by the helper
1300 */
1301int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1302 struct fb_info *info)
1303{
1304 struct drm_fb_helper *fb_helper = info->par;
1305 struct drm_framebuffer *fb = fb_helper->fb;
1306
1307 if (in_dbg_master())
1308 return -EINVAL;
1309
1310 if (var->pixclock != 0) {
1311 DRM_DEBUG("fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1312 var->pixclock = 0;
1313 }
1314
1315 if ((drm_format_info_block_width(fb->format, 0) > 1) ||
1316 (drm_format_info_block_height(fb->format, 0) > 1))
1317 return -EINVAL;
1318
1319 /*
1320 * Changes struct fb_var_screeninfo are currently not pushed back
1321 * to KMS, hence fail if different settings are requested.
1322 */
1323 if (var->bits_per_pixel != fb->format->cpp[0] * 8 ||
1324 var->xres > fb->width || var->yres > fb->height ||
1325 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1326 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb "
1327 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1328 var->xres, var->yres, var->bits_per_pixel,
1329 var->xres_virtual, var->yres_virtual,
1330 fb->width, fb->height, fb->format->cpp[0] * 8);
1331 return -EINVAL;
1332 }
1333
1334 /*
1335 * Workaround for SDL 1.2, which is known to be setting all pixel format
1336 * fields values to zero in some cases. We treat this situation as a
1337 * kind of "use some reasonable autodetected values".
1338 */
1339 if (!var->red.offset && !var->green.offset &&
1340 !var->blue.offset && !var->transp.offset &&
1341 !var->red.length && !var->green.length &&
1342 !var->blue.length && !var->transp.length &&
1343 !var->red.msb_right && !var->green.msb_right &&
1344 !var->blue.msb_right && !var->transp.msb_right) {
1345 drm_fb_helper_fill_pixel_fmt(var, fb->format->depth);
1346 }
1347
1348 /*
1349 * drm fbdev emulation doesn't support changing the pixel format at all,
1350 * so reject all pixel format changing requests.
1351 */
1352 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1353 DRM_DEBUG("fbdev emulation doesn't support changing the pixel format\n");
1354 return -EINVAL;
1355 }
1356
1357 return 0;
1358}
1359EXPORT_SYMBOL(drm_fb_helper_check_var);
1360
1361/**
1362 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1363 * @info: fbdev registered by the helper
1364 *
1365 * This will let fbcon do the mode init and is called at initialization time by
1366 * the fbdev core when registering the driver, and later on through the hotplug
1367 * callback.
1368 */
1369int drm_fb_helper_set_par(struct fb_info *info)
1370{
1371 struct drm_fb_helper *fb_helper = info->par;
1372 struct fb_var_screeninfo *var = &info->var;
1373
1374 if (oops_in_progress)
1375 return -EBUSY;
1376
1377 if (var->pixclock != 0) {
1378 DRM_ERROR("PIXEL CLOCK SET\n");
1379 return -EINVAL;
1380 }
1381
1382 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1383
1384 return 0;
1385}
1386EXPORT_SYMBOL(drm_fb_helper_set_par);
1387
1388static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
1389{
1390 struct drm_mode_set *mode_set;
1391
1392 mutex_lock(&fb_helper->client.modeset_mutex);
1393 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1394 mode_set->x = x;
1395 mode_set->y = y;
1396 }
1397 mutex_unlock(&fb_helper->client.modeset_mutex);
1398}
1399
1400static int pan_display_atomic(struct fb_var_screeninfo *var,
1401 struct fb_info *info)
1402{
1403 struct drm_fb_helper *fb_helper = info->par;
1404 int ret;
1405
1406 pan_set(fb_helper, var->xoffset, var->yoffset);
1407
1408 ret = drm_client_modeset_commit_force(&fb_helper->client);
1409 if (!ret) {
1410 info->var.xoffset = var->xoffset;
1411 info->var.yoffset = var->yoffset;
1412 } else
1413 pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
1414
1415 return ret;
1416}
1417
1418static int pan_display_legacy(struct fb_var_screeninfo *var,
1419 struct fb_info *info)
1420{
1421 struct drm_fb_helper *fb_helper = info->par;
1422 struct drm_client_dev *client = &fb_helper->client;
1423 struct drm_mode_set *modeset;
1424 int ret = 0;
1425
1426 mutex_lock(&client->modeset_mutex);
1427 drm_modeset_lock_all(fb_helper->dev);
1428 drm_client_for_each_modeset(modeset, client) {
1429 modeset->x = var->xoffset;
1430 modeset->y = var->yoffset;
1431
1432 if (modeset->num_connectors) {
1433 ret = drm_mode_set_config_internal(modeset);
1434 if (!ret) {
1435 info->var.xoffset = var->xoffset;
1436 info->var.yoffset = var->yoffset;
1437 }
1438 }
1439 }
1440 drm_modeset_unlock_all(fb_helper->dev);
1441 mutex_unlock(&client->modeset_mutex);
1442
1443 return ret;
1444}
1445
1446/**
1447 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1448 * @var: updated screen information
1449 * @info: fbdev registered by the helper
1450 */
1451int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1452 struct fb_info *info)
1453{
1454 struct drm_fb_helper *fb_helper = info->par;
1455 struct drm_device *dev = fb_helper->dev;
1456 int ret;
1457
1458 if (oops_in_progress)
1459 return -EBUSY;
1460
1461 mutex_lock(&fb_helper->lock);
1462 if (!drm_master_internal_acquire(dev)) {
1463 ret = -EBUSY;
1464 goto unlock;
1465 }
1466
1467 if (drm_drv_uses_atomic_modeset(dev))
1468 ret = pan_display_atomic(var, info);
1469 else
1470 ret = pan_display_legacy(var, info);
1471
1472 drm_master_internal_release(dev);
1473unlock:
1474 mutex_unlock(&fb_helper->lock);
1475
1476 return ret;
1477}
1478EXPORT_SYMBOL(drm_fb_helper_pan_display);
1479
1480/*
1481 * Allocates the backing storage and sets up the fbdev info structure through
1482 * the ->fb_probe callback.
1483 */
1484static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1485 int preferred_bpp)
1486{
1487 struct drm_client_dev *client = &fb_helper->client;
1488 int ret = 0;
1489 int crtc_count = 0;
1490 struct drm_connector_list_iter conn_iter;
1491 struct drm_fb_helper_surface_size sizes;
1492 struct drm_connector *connector;
1493 struct drm_mode_set *mode_set;
1494 int best_depth = 0;
1495
1496 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1497 sizes.surface_depth = 24;
1498 sizes.surface_bpp = 32;
1499 sizes.fb_width = (u32)-1;
1500 sizes.fb_height = (u32)-1;
1501
1502 /*
1503 * If driver picks 8 or 16 by default use that for both depth/bpp
1504 * to begin with
1505 */
1506 if (preferred_bpp != sizes.surface_bpp)
1507 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1508
1509 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1510 drm_client_for_each_connector_iter(connector, &conn_iter) {
1511 struct drm_cmdline_mode *cmdline_mode;
1512
1513 cmdline_mode = &connector->cmdline_mode;
1514
1515 if (cmdline_mode->bpp_specified) {
1516 switch (cmdline_mode->bpp) {
1517 case 8:
1518 sizes.surface_depth = sizes.surface_bpp = 8;
1519 break;
1520 case 15:
1521 sizes.surface_depth = 15;
1522 sizes.surface_bpp = 16;
1523 break;
1524 case 16:
1525 sizes.surface_depth = sizes.surface_bpp = 16;
1526 break;
1527 case 24:
1528 sizes.surface_depth = sizes.surface_bpp = 24;
1529 break;
1530 case 32:
1531 sizes.surface_depth = 24;
1532 sizes.surface_bpp = 32;
1533 break;
1534 }
1535 break;
1536 }
1537 }
1538 drm_connector_list_iter_end(&conn_iter);
1539
1540 /*
1541 * If we run into a situation where, for example, the primary plane
1542 * supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
1543 * 16) we need to scale down the depth of the sizes we request.
1544 */
1545 mutex_lock(&client->modeset_mutex);
1546 drm_client_for_each_modeset(mode_set, client) {
1547 struct drm_crtc *crtc = mode_set->crtc;
1548 struct drm_plane *plane = crtc->primary;
1549 int j;
1550
1551 DRM_DEBUG("test CRTC %u primary plane\n", drm_crtc_index(crtc));
1552
1553 for (j = 0; j < plane->format_count; j++) {
1554 const struct drm_format_info *fmt;
1555
1556 fmt = drm_format_info(plane->format_types[j]);
1557
1558 /*
1559 * Do not consider YUV or other complicated formats
1560 * for framebuffers. This means only legacy formats
1561 * are supported (fmt->depth is a legacy field) but
1562 * the framebuffer emulation can only deal with such
1563 * formats, specifically RGB/BGA formats.
1564 */
1565 if (fmt->depth == 0)
1566 continue;
1567
1568 /* We found a perfect fit, great */
1569 if (fmt->depth == sizes.surface_depth) {
1570 best_depth = fmt->depth;
1571 break;
1572 }
1573
1574 /* Skip depths above what we're looking for */
1575 if (fmt->depth > sizes.surface_depth)
1576 continue;
1577
1578 /* Best depth found so far */
1579 if (fmt->depth > best_depth)
1580 best_depth = fmt->depth;
1581 }
1582 }
1583 if (sizes.surface_depth != best_depth && best_depth) {
1584 DRM_INFO("requested bpp %d, scaled depth down to %d",
1585 sizes.surface_bpp, best_depth);
1586 sizes.surface_depth = best_depth;
1587 }
1588
1589 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1590 crtc_count = 0;
1591 drm_client_for_each_modeset(mode_set, client) {
1592 struct drm_display_mode *desired_mode;
1593 int x, y, j;
1594 /* in case of tile group, are we the last tile vert or horiz?
1595 * If no tile group you are always the last one both vertically
1596 * and horizontally
1597 */
1598 bool lastv = true, lasth = true;
1599
1600 desired_mode = mode_set->mode;
1601
1602 if (!desired_mode)
1603 continue;
1604
1605 crtc_count++;
1606
1607 x = mode_set->x;
1608 y = mode_set->y;
1609
1610 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1611 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1612
1613 for (j = 0; j < mode_set->num_connectors; j++) {
1614 struct drm_connector *connector = mode_set->connectors[j];
1615
1616 if (connector->has_tile) {
1617 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1618 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1619 /* cloning to multiple tiles is just crazy-talk, so: */
1620 break;
1621 }
1622 }
1623
1624 if (lasth)
1625 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1626 if (lastv)
1627 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1628 }
1629 mutex_unlock(&client->modeset_mutex);
1630
1631 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1632 DRM_INFO("Cannot find any crtc or sizes\n");
1633
1634 /* First time: disable all crtc's.. */
1635 if (!fb_helper->deferred_setup)
1636 drm_client_modeset_commit(client);
1637 return -EAGAIN;
1638 }
1639
1640 /* Handle our overallocation */
1641 sizes.surface_height *= drm_fbdev_overalloc;
1642 sizes.surface_height /= 100;
1643
1644 /* push down into drivers */
1645 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1646 if (ret < 0)
1647 return ret;
1648
1649 strcpy(fb_helper->fb->comm, "[fbcon]");
1650 return 0;
1651}
1652
1653static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1654 uint32_t depth)
1655{
1656 info->fix.type = FB_TYPE_PACKED_PIXELS;
1657 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1658 FB_VISUAL_TRUECOLOR;
1659 info->fix.mmio_start = 0;
1660 info->fix.mmio_len = 0;
1661 info->fix.type_aux = 0;
1662 info->fix.xpanstep = 1; /* doing it in hw */
1663 info->fix.ypanstep = 1; /* doing it in hw */
1664 info->fix.ywrapstep = 0;
1665 info->fix.accel = FB_ACCEL_NONE;
1666
1667 info->fix.line_length = pitch;
1668}
1669
1670static void drm_fb_helper_fill_var(struct fb_info *info,
1671 struct drm_fb_helper *fb_helper,
1672 uint32_t fb_width, uint32_t fb_height)
1673{
1674 struct drm_framebuffer *fb = fb_helper->fb;
1675
1676 WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) ||
1677 (drm_format_info_block_height(fb->format, 0) > 1));
1678 info->pseudo_palette = fb_helper->pseudo_palette;
1679 info->var.xres_virtual = fb->width;
1680 info->var.yres_virtual = fb->height;
1681 info->var.bits_per_pixel = fb->format->cpp[0] * 8;
1682 info->var.accel_flags = FB_ACCELF_TEXT;
1683 info->var.xoffset = 0;
1684 info->var.yoffset = 0;
1685 info->var.activate = FB_ACTIVATE_NOW;
1686
1687 drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
1688
1689 info->var.xres = fb_width;
1690 info->var.yres = fb_height;
1691}
1692
1693/**
1694 * drm_fb_helper_fill_info - initializes fbdev information
1695 * @info: fbdev instance to set up
1696 * @fb_helper: fb helper instance to use as template
1697 * @sizes: describes fbdev size and scanout surface size
1698 *
1699 * Sets up the variable and fixed fbdev metainformation from the given fb helper
1700 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
1701 *
1702 * Drivers should call this (or their equivalent setup code) from their
1703 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1704 * backing storage framebuffer.
1705 */
1706void drm_fb_helper_fill_info(struct fb_info *info,
1707 struct drm_fb_helper *fb_helper,
1708 struct drm_fb_helper_surface_size *sizes)
1709{
1710 struct drm_framebuffer *fb = fb_helper->fb;
1711
1712 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
1713 drm_fb_helper_fill_var(info, fb_helper,
1714 sizes->fb_width, sizes->fb_height);
1715
1716 info->par = fb_helper;
1717 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
1718 fb_helper->dev->driver->name);
1719
1720}
1721EXPORT_SYMBOL(drm_fb_helper_fill_info);
1722
1723/*
1724 * This is a continuation of drm_setup_crtcs() that sets up anything related
1725 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
1726 * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
1727 * So, any setup that touches those fields needs to be done here instead of in
1728 * drm_setup_crtcs().
1729 */
1730static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
1731{
1732 struct drm_client_dev *client = &fb_helper->client;
1733 struct drm_connector_list_iter conn_iter;
1734 struct fb_info *info = fb_helper->fbdev;
1735 unsigned int rotation, sw_rotations = 0;
1736 struct drm_connector *connector;
1737 struct drm_mode_set *modeset;
1738
1739 mutex_lock(&client->modeset_mutex);
1740 drm_client_for_each_modeset(modeset, client) {
1741 if (!modeset->num_connectors)
1742 continue;
1743
1744 modeset->fb = fb_helper->fb;
1745
1746 if (drm_client_rotation(modeset, &rotation))
1747 /* Rotating in hardware, fbcon should not rotate */
1748 sw_rotations |= DRM_MODE_ROTATE_0;
1749 else
1750 sw_rotations |= rotation;
1751 }
1752 mutex_unlock(&client->modeset_mutex);
1753
1754 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1755 drm_client_for_each_connector_iter(connector, &conn_iter) {
1756
1757 /* use first connected connector for the physical dimensions */
1758 if (connector->status == connector_status_connected) {
1759 info->var.width = connector->display_info.width_mm;
1760 info->var.height = connector->display_info.height_mm;
1761 break;
1762 }
1763 }
1764 drm_connector_list_iter_end(&conn_iter);
1765
1766 switch (sw_rotations) {
1767 case DRM_MODE_ROTATE_0:
1768 info->fbcon_rotate_hint = FB_ROTATE_UR;
1769 break;
1770 case DRM_MODE_ROTATE_90:
1771 info->fbcon_rotate_hint = FB_ROTATE_CCW;
1772 break;
1773 case DRM_MODE_ROTATE_180:
1774 info->fbcon_rotate_hint = FB_ROTATE_UD;
1775 break;
1776 case DRM_MODE_ROTATE_270:
1777 info->fbcon_rotate_hint = FB_ROTATE_CW;
1778 break;
1779 default:
1780 /*
1781 * Multiple bits are set / multiple rotations requested
1782 * fbcon cannot handle separate rotation settings per
1783 * output, so fallback to unrotated.
1784 */
1785 info->fbcon_rotate_hint = FB_ROTATE_UR;
1786 }
1787}
1788
1789/* Note: Drops fb_helper->lock before returning. */
1790static int
1791__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
1792 int bpp_sel)
1793{
1794 struct drm_device *dev = fb_helper->dev;
1795 struct fb_info *info;
1796 unsigned int width, height;
1797 int ret;
1798
1799 width = dev->mode_config.max_width;
1800 height = dev->mode_config.max_height;
1801
1802 drm_client_modeset_probe(&fb_helper->client, width, height);
1803 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1804 if (ret < 0) {
1805 if (ret == -EAGAIN) {
1806 fb_helper->preferred_bpp = bpp_sel;
1807 fb_helper->deferred_setup = true;
1808 ret = 0;
1809 }
1810 mutex_unlock(&fb_helper->lock);
1811
1812 return ret;
1813 }
1814 drm_setup_crtcs_fb(fb_helper);
1815
1816 fb_helper->deferred_setup = false;
1817
1818 info = fb_helper->fbdev;
1819 info->var.pixclock = 0;
1820 /* Shamelessly allow physical address leaking to userspace */
1821#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
1822 if (!drm_leak_fbdev_smem)
1823#endif
1824 /* don't leak any physical addresses to userspace */
1825 info->flags |= FBINFO_HIDE_SMEM_START;
1826
1827 /* Need to drop locks to avoid recursive deadlock in
1828 * register_framebuffer. This is ok because the only thing left to do is
1829 * register the fbdev emulation instance in kernel_fb_helper_list. */
1830 mutex_unlock(&fb_helper->lock);
1831
1832 ret = register_framebuffer(info);
1833 if (ret < 0)
1834 return ret;
1835
1836 dev_info(dev->dev, "fb%d: %s frame buffer device\n",
1837 info->node, info->fix.id);
1838
1839 mutex_lock(&kernel_fb_helper_lock);
1840 if (list_empty(&kernel_fb_helper_list))
1841 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1842
1843 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1844 mutex_unlock(&kernel_fb_helper_lock);
1845
1846 return 0;
1847}
1848
1849/**
1850 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1851 * @fb_helper: fb_helper device struct
1852 * @bpp_sel: bpp value to use for the framebuffer configuration
1853 *
1854 * Scans the CRTCs and connectors and tries to put together an initial setup.
1855 * At the moment, this is a cloned configuration across all heads with
1856 * a new framebuffer object as the backing store.
1857 *
1858 * Note that this also registers the fbdev and so allows userspace to call into
1859 * the driver through the fbdev interfaces.
1860 *
1861 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
1862 * to let the driver allocate and initialize the fbdev info structure and the
1863 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
1864 * as a helper to setup simple default values for the fbdev info structure.
1865 *
1866 * HANG DEBUGGING:
1867 *
1868 * When you have fbcon support built-in or already loaded, this function will do
1869 * a full modeset to setup the fbdev console. Due to locking misdesign in the
1870 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
1871 * console_lock. Until console_unlock is called no dmesg lines will be sent out
1872 * to consoles, not even serial console. This means when your driver crashes,
1873 * you will see absolutely nothing else but a system stuck in this function,
1874 * with no further output. Any kind of printk() you place within your own driver
1875 * or in the drm core modeset code will also never show up.
1876 *
1877 * Standard debug practice is to run the fbcon setup without taking the
1878 * console_lock as a hack, to be able to see backtraces and crashes on the
1879 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
1880 * cmdline option.
1881 *
1882 * The other option is to just disable fbdev emulation since very likely the
1883 * first modeset from userspace will crash in the same way, and is even easier
1884 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
1885 * kernel cmdline option.
1886 *
1887 * RETURNS:
1888 * Zero if everything went ok, nonzero otherwise.
1889 */
1890int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1891{
1892 int ret;
1893
1894 if (!drm_fbdev_emulation)
1895 return 0;
1896
1897 mutex_lock(&fb_helper->lock);
1898 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
1899
1900 return ret;
1901}
1902EXPORT_SYMBOL(drm_fb_helper_initial_config);
1903
1904/**
1905 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1906 * probing all the outputs attached to the fb
1907 * @fb_helper: driver-allocated fbdev helper, can be NULL
1908 *
1909 * Scan the connectors attached to the fb_helper and try to put together a
1910 * setup after notification of a change in output configuration.
1911 *
1912 * Called at runtime, takes the mode config locks to be able to check/change the
1913 * modeset configuration. Must be run from process context (which usually means
1914 * either the output polling work or a work item launched from the driver's
1915 * hotplug interrupt).
1916 *
1917 * Note that drivers may call this even before calling
1918 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
1919 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1920 * not miss any hotplug events.
1921 *
1922 * RETURNS:
1923 * 0 on success and a non-zero error code otherwise.
1924 */
1925int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1926{
1927 int err = 0;
1928
1929 if (!drm_fbdev_emulation || !fb_helper)
1930 return 0;
1931
1932 mutex_lock(&fb_helper->lock);
1933 if (fb_helper->deferred_setup) {
1934 err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
1935 fb_helper->preferred_bpp);
1936 return err;
1937 }
1938
1939 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
1940 fb_helper->delayed_hotplug = true;
1941 mutex_unlock(&fb_helper->lock);
1942 return err;
1943 }
1944
1945 drm_master_internal_release(fb_helper->dev);
1946
1947 DRM_DEBUG_KMS("\n");
1948
1949 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
1950 drm_setup_crtcs_fb(fb_helper);
1951 mutex_unlock(&fb_helper->lock);
1952
1953 drm_fb_helper_set_par(fb_helper->fbdev);
1954
1955 return 0;
1956}
1957EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1958
1959/**
1960 * drm_fb_helper_fbdev_setup() - Setup fbdev emulation
1961 * @dev: DRM device
1962 * @fb_helper: fbdev helper structure to set up
1963 * @funcs: fbdev helper functions
1964 * @preferred_bpp: Preferred bits per pixel for the device.
1965 * @dev->mode_config.preferred_depth is used if this is zero.
1966 * @max_conn_count: Maximum number of connectors (not used)
1967 *
1968 * This function sets up fbdev emulation and registers fbdev for access by
1969 * userspace. If all connectors are disconnected, setup is deferred to the next
1970 * time drm_fb_helper_hotplug_event() is called.
1971 * The caller must to provide a &drm_fb_helper_funcs->fb_probe callback
1972 * function.
1973 *
1974 * Use drm_fb_helper_fbdev_teardown() to destroy the fbdev.
1975 *
1976 * See also: drm_fb_helper_initial_config(), drm_fbdev_generic_setup().
1977 *
1978 * Returns:
1979 * Zero on success or negative error code on failure.
1980 */
1981int drm_fb_helper_fbdev_setup(struct drm_device *dev,
1982 struct drm_fb_helper *fb_helper,
1983 const struct drm_fb_helper_funcs *funcs,
1984 unsigned int preferred_bpp,
1985 unsigned int max_conn_count)
1986{
1987 int ret;
1988
1989 if (!preferred_bpp)
1990 preferred_bpp = dev->mode_config.preferred_depth;
1991 if (!preferred_bpp)
1992 preferred_bpp = 32;
1993
1994 drm_fb_helper_prepare(dev, fb_helper, funcs);
1995
1996 ret = drm_fb_helper_init(dev, fb_helper, 0);
1997 if (ret < 0) {
1998 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to initialize (ret=%d)\n", ret);
1999 return ret;
2000 }
2001
2002 if (!drm_drv_uses_atomic_modeset(dev))
2003 drm_helper_disable_unused_functions(dev);
2004
2005 ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
2006 if (ret < 0) {
2007 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to set configuration (ret=%d)\n", ret);
2008 goto err_drm_fb_helper_fini;
2009 }
2010
2011 return 0;
2012
2013err_drm_fb_helper_fini:
2014 drm_fb_helper_fbdev_teardown(dev);
2015
2016 return ret;
2017}
2018EXPORT_SYMBOL(drm_fb_helper_fbdev_setup);
2019
2020/**
2021 * drm_fb_helper_fbdev_teardown - Tear down fbdev emulation
2022 * @dev: DRM device
2023 *
2024 * This function unregisters fbdev if not already done and cleans up the
2025 * associated resources including the &drm_framebuffer.
2026 * The driver is responsible for freeing the &drm_fb_helper structure which is
2027 * stored in &drm_device->fb_helper. Do note that this pointer has been cleared
2028 * when this function returns.
2029 *
2030 * In order to support device removal/unplug while file handles are still open,
2031 * drm_fb_helper_unregister_fbi() should be called on device removal and
2032 * drm_fb_helper_fbdev_teardown() in the &drm_driver->release callback when
2033 * file handles are closed.
2034 */
2035void drm_fb_helper_fbdev_teardown(struct drm_device *dev)
2036{
2037 struct drm_fb_helper *fb_helper = dev->fb_helper;
2038 struct fb_ops *fbops = NULL;
2039
2040 if (!fb_helper)
2041 return;
2042
2043 /* Unregister if it hasn't been done already */
2044 if (fb_helper->fbdev && fb_helper->fbdev->dev)
2045 drm_fb_helper_unregister_fbi(fb_helper);
2046
2047 if (fb_helper->fbdev && fb_helper->fbdev->fbdefio) {
2048 fb_deferred_io_cleanup(fb_helper->fbdev);
2049 kfree(fb_helper->fbdev->fbdefio);
2050 fbops = fb_helper->fbdev->fbops;
2051 }
2052
2053 drm_fb_helper_fini(fb_helper);
2054 kfree(fbops);
2055
2056 if (fb_helper->fb)
2057 drm_framebuffer_remove(fb_helper->fb);
2058}
2059EXPORT_SYMBOL(drm_fb_helper_fbdev_teardown);
2060
2061/**
2062 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
2063 * @dev: DRM device
2064 *
2065 * This function can be used as the &drm_driver->lastclose callback for drivers
2066 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
2067 */
2068void drm_fb_helper_lastclose(struct drm_device *dev)
2069{
2070 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
2071}
2072EXPORT_SYMBOL(drm_fb_helper_lastclose);
2073
2074/**
2075 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
2076 * helper for fbdev emulation
2077 * @dev: DRM device
2078 *
2079 * This function can be used as the
2080 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only
2081 * need to call drm_fb_helper_hotplug_event().
2082 */
2083void drm_fb_helper_output_poll_changed(struct drm_device *dev)
2084{
2085 drm_fb_helper_hotplug_event(dev->fb_helper);
2086}
2087EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);
2088
2089/* @user: 1=userspace, 0=fbcon */
2090static int drm_fbdev_fb_open(struct fb_info *info, int user)
2091{
2092 struct drm_fb_helper *fb_helper = info->par;
2093
2094 /* No need to take a ref for fbcon because it unbinds on unregister */
2095 if (user && !try_module_get(fb_helper->dev->driver->fops->owner))
2096 return -ENODEV;
2097
2098 return 0;
2099}
2100
2101static int drm_fbdev_fb_release(struct fb_info *info, int user)
2102{
2103 struct drm_fb_helper *fb_helper = info->par;
2104
2105 if (user)
2106 module_put(fb_helper->dev->driver->fops->owner);
2107
2108 return 0;
2109}
2110
2111static void drm_fbdev_cleanup(struct drm_fb_helper *fb_helper)
2112{
2113 struct fb_info *fbi = fb_helper->fbdev;
2114 struct fb_ops *fbops = NULL;
2115 void *shadow = NULL;
2116
2117 if (!fb_helper->dev)
2118 return;
2119
2120 if (fbi && fbi->fbdefio) {
2121 fb_deferred_io_cleanup(fbi);
2122 shadow = fbi->screen_buffer;
2123 fbops = fbi->fbops;
2124 }
2125
2126 drm_fb_helper_fini(fb_helper);
2127
2128 if (shadow) {
2129 vfree(shadow);
2130 kfree(fbops);
2131 }
2132
2133 drm_client_framebuffer_delete(fb_helper->buffer);
2134}
2135
2136static void drm_fbdev_release(struct drm_fb_helper *fb_helper)
2137{
2138 drm_fbdev_cleanup(fb_helper);
2139 drm_client_release(&fb_helper->client);
2140 kfree(fb_helper);
2141}
2142
2143/*
2144 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end of
2145 * unregister_framebuffer() or fb_release().
2146 */
2147static void drm_fbdev_fb_destroy(struct fb_info *info)
2148{
2149 drm_fbdev_release(info->par);
2150}
2151
2152static int drm_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
2153{
2154 struct drm_fb_helper *fb_helper = info->par;
2155
2156 if (fb_helper->dev->driver->gem_prime_mmap)
2157 return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma);
2158 else
2159 return -ENODEV;
2160}
2161
2162static struct fb_ops drm_fbdev_fb_ops = {
2163 .owner = THIS_MODULE,
2164 DRM_FB_HELPER_DEFAULT_OPS,
2165 .fb_open = drm_fbdev_fb_open,
2166 .fb_release = drm_fbdev_fb_release,
2167 .fb_destroy = drm_fbdev_fb_destroy,
2168 .fb_mmap = drm_fbdev_fb_mmap,
2169 .fb_read = drm_fb_helper_sys_read,
2170 .fb_write = drm_fb_helper_sys_write,
2171 .fb_fillrect = drm_fb_helper_sys_fillrect,
2172 .fb_copyarea = drm_fb_helper_sys_copyarea,
2173 .fb_imageblit = drm_fb_helper_sys_imageblit,
2174};
2175
2176static struct fb_deferred_io drm_fbdev_defio = {
2177 .delay = HZ / 20,
2178 .deferred_io = drm_fb_helper_deferred_io,
2179};
2180
2181/**
2182 * drm_fb_helper_generic_probe - Generic fbdev emulation probe helper
2183 * @fb_helper: fbdev helper structure
2184 * @sizes: describes fbdev size and scanout surface size
2185 *
2186 * This function uses the client API to create a framebuffer backed by a dumb buffer.
2187 *
2188 * The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect,
2189 * fb_copyarea, fb_imageblit.
2190 *
2191 * Returns:
2192 * Zero on success or negative error code on failure.
2193 */
2194int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
2195 struct drm_fb_helper_surface_size *sizes)
2196{
2197 struct drm_client_dev *client = &fb_helper->client;
2198 struct drm_client_buffer *buffer;
2199 struct drm_framebuffer *fb;
2200 struct fb_info *fbi;
2201 u32 format;
2202 void *vaddr;
2203
2204 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
2205 sizes->surface_width, sizes->surface_height,
2206 sizes->surface_bpp);
2207
2208 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
2209 buffer = drm_client_framebuffer_create(client, sizes->surface_width,
2210 sizes->surface_height, format);
2211 if (IS_ERR(buffer))
2212 return PTR_ERR(buffer);
2213
2214 fb_helper->buffer = buffer;
2215 fb_helper->fb = buffer->fb;
2216 fb = buffer->fb;
2217
2218 fbi = drm_fb_helper_alloc_fbi(fb_helper);
2219 if (IS_ERR(fbi))
2220 return PTR_ERR(fbi);
2221
2222 fbi->fbops = &drm_fbdev_fb_ops;
2223 fbi->screen_size = fb->height * fb->pitches[0];
2224 fbi->fix.smem_len = fbi->screen_size;
2225
2226 drm_fb_helper_fill_info(fbi, fb_helper, sizes);
2227
2228 if (drm_fbdev_use_shadow_fb(fb_helper)) {
2229 struct fb_ops *fbops;
2230 void *shadow;
2231
2232 /*
2233 * fb_deferred_io_cleanup() clears &fbops->fb_mmap so a per
2234 * instance version is necessary.
2235 */
2236 fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
2237 shadow = vzalloc(fbi->screen_size);
2238 if (!fbops || !shadow) {
2239 kfree(fbops);
2240 vfree(shadow);
2241 return -ENOMEM;
2242 }
2243
2244 *fbops = *fbi->fbops;
2245 fbi->fbops = fbops;
2246 fbi->screen_buffer = shadow;
2247 fbi->fbdefio = &drm_fbdev_defio;
2248
2249 fb_deferred_io_init(fbi);
2250 } else {
2251 /* buffer is mapped for HW framebuffer */
2252 vaddr = drm_client_buffer_vmap(fb_helper->buffer);
2253 if (IS_ERR(vaddr))
2254 return PTR_ERR(vaddr);
2255
2256 fbi->screen_buffer = vaddr;
2257 /* Shamelessly leak the physical address to user-space */
2258#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
2259 if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0)
2260 fbi->fix.smem_start =
2261 page_to_phys(virt_to_page(fbi->screen_buffer));
2262#endif
2263 }
2264
2265 return 0;
2266}
2267EXPORT_SYMBOL(drm_fb_helper_generic_probe);
2268
2269static const struct drm_fb_helper_funcs drm_fb_helper_generic_funcs = {
2270 .fb_probe = drm_fb_helper_generic_probe,
2271};
2272
2273static void drm_fbdev_client_unregister(struct drm_client_dev *client)
2274{
2275 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2276
2277 if (fb_helper->fbdev)
2278 /* drm_fbdev_fb_destroy() takes care of cleanup */
2279 drm_fb_helper_unregister_fbi(fb_helper);
2280 else
2281 drm_fbdev_release(fb_helper);
2282}
2283
2284static int drm_fbdev_client_restore(struct drm_client_dev *client)
2285{
2286 drm_fb_helper_lastclose(client->dev);
2287
2288 return 0;
2289}
2290
2291static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
2292{
2293 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2294 struct drm_device *dev = client->dev;
2295 int ret;
2296
2297 /* Setup is not retried if it has failed */
2298 if (!fb_helper->dev && fb_helper->funcs)
2299 return 0;
2300
2301 if (dev->fb_helper)
2302 return drm_fb_helper_hotplug_event(dev->fb_helper);
2303
2304 if (!dev->mode_config.num_connector) {
2305 DRM_DEV_DEBUG(dev->dev, "No connectors found, will not create framebuffer!\n");
2306 return 0;
2307 }
2308
2309 drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
2310
2311 ret = drm_fb_helper_init(dev, fb_helper, 0);
2312 if (ret)
2313 goto err;
2314
2315 if (!drm_drv_uses_atomic_modeset(dev))
2316 drm_helper_disable_unused_functions(dev);
2317
2318 ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp);
2319 if (ret)
2320 goto err_cleanup;
2321
2322 return 0;
2323
2324err_cleanup:
2325 drm_fbdev_cleanup(fb_helper);
2326err:
2327 fb_helper->dev = NULL;
2328 fb_helper->fbdev = NULL;
2329
2330 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to setup generic emulation (ret=%d)\n", ret);
2331
2332 return ret;
2333}
2334
2335static const struct drm_client_funcs drm_fbdev_client_funcs = {
2336 .owner = THIS_MODULE,
2337 .unregister = drm_fbdev_client_unregister,
2338 .restore = drm_fbdev_client_restore,
2339 .hotplug = drm_fbdev_client_hotplug,
2340};
2341
2342/**
2343 * drm_fbdev_generic_setup() - Setup generic fbdev emulation
2344 * @dev: DRM device
2345 * @preferred_bpp: Preferred bits per pixel for the device.
2346 * @dev->mode_config.preferred_depth is used if this is zero.
2347 *
2348 * This function sets up generic fbdev emulation for drivers that supports
2349 * dumb buffers with a virtual address and that can be mmap'ed. If the driver
2350 * does not support these functions, it could use drm_fb_helper_fbdev_setup().
2351 *
2352 * Restore, hotplug events and teardown are all taken care of. Drivers that do
2353 * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
2354 * Simple drivers might use drm_mode_config_helper_suspend().
2355 *
2356 * Drivers that set the dirty callback on their framebuffer will get a shadow
2357 * fbdev buffer that is blitted onto the real buffer. This is done in order to
2358 * make deferred I/O work with all kinds of buffers.
2359 *
2360 * This function is safe to call even when there are no connectors present.
2361 * Setup will be retried on the next hotplug event.
2362 *
2363 * The fbdev is destroyed by drm_dev_unregister().
2364 *
2365 * Returns:
2366 * Zero on success or negative error code on failure.
2367 */
2368int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
2369{
2370 struct drm_fb_helper *fb_helper;
2371 int ret;
2372
2373 WARN(dev->fb_helper, "fb_helper is already set!\n");
2374
2375 if (!drm_fbdev_emulation)
2376 return 0;
2377
2378 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
2379 if (!fb_helper)
2380 return -ENOMEM;
2381
2382 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
2383 if (ret) {
2384 kfree(fb_helper);
2385 DRM_DEV_ERROR(dev->dev, "Failed to register client: %d\n", ret);
2386 return ret;
2387 }
2388
2389 if (!preferred_bpp)
2390 preferred_bpp = dev->mode_config.preferred_depth;
2391 if (!preferred_bpp)
2392 preferred_bpp = 32;
2393 fb_helper->preferred_bpp = preferred_bpp;
2394
2395 ret = drm_fbdev_client_hotplug(&fb_helper->client);
2396 if (ret)
2397 DRM_DEV_DEBUG(dev->dev, "client hotplug ret=%d\n", ret);
2398
2399 drm_client_register(&fb_helper->client);
2400
2401 return 0;
2402}
2403EXPORT_SYMBOL(drm_fbdev_generic_setup);
2404
2405/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2406 * but the module doesn't depend on any fb console symbols. At least
2407 * attempt to load fbcon to avoid leaving the system without a usable console.
2408 */
2409int __init drm_fb_helper_modinit(void)
2410{
2411#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2412 const char name[] = "fbcon";
2413 struct module *fbcon;
2414
2415 mutex_lock(&module_mutex);
2416 fbcon = find_module(name);
2417 mutex_unlock(&module_mutex);
2418
2419 if (!fbcon)
2420 request_module_nowait(name);
2421#endif
2422 return 0;
2423}
2424EXPORT_SYMBOL(drm_fb_helper_modinit);
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>
5 *
6 * DRM framebuffer helper functions
7 *
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.
17 *
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.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32#include <linux/kernel.h>
33#include <linux/sysrq.h>
34#include <linux/slab.h>
35#include <linux/fb.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
42static LIST_HEAD(kernel_fb_helper_list);
43
44/**
45 * DOC: fbdev helpers
46 *
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 independantely from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
50 * interfaces.
51 *
52 * Initialization is done as a three-step process with drm_fb_helper_init(),
53 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
54 * Drivers with fancier requirements than the default beheviour can override the
55 * second step with their own code. Teardown is done with drm_fb_helper_fini().
56 *
57 * At runtime drivers should restore the fbdev console by calling
58 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
59 * should also notify the fb helper code from updates to the output
60 * configuration by calling drm_fb_helper_hotplug_event(). For easier
61 * integration with the output polling code in drm_crtc_helper.c the modeset
62 * code proves a ->output_poll_changed callback.
63 *
64 * All other functions exported by the fb helper library can be used to
65 * implement the fbdev driver interface by the driver.
66 */
67
68/**
69 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
70 * emulation helper
71 * @fb_helper: fbdev initialized with drm_fb_helper_init
72 *
73 * This functions adds all the available connectors for use with the given
74 * fb_helper. This is a separate step to allow drivers to freely assign
75 * connectors to the fbdev, e.g. if some are reserved for special purposes or
76 * not adequate to be used for the fbcon.
77 *
78 * Since this is part of the initial setup before the fbdev is published, no
79 * locking is required.
80 */
81int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
82{
83 struct drm_device *dev = fb_helper->dev;
84 struct drm_connector *connector;
85 int i;
86
87 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
88 struct drm_fb_helper_connector *fb_helper_connector;
89
90 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
91 if (!fb_helper_connector)
92 goto fail;
93
94 fb_helper_connector->connector = connector;
95 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
96 }
97 return 0;
98fail:
99 for (i = 0; i < fb_helper->connector_count; i++) {
100 kfree(fb_helper->connector_info[i]);
101 fb_helper->connector_info[i] = NULL;
102 }
103 fb_helper->connector_count = 0;
104 return -ENOMEM;
105}
106EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
107
108static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
109{
110 struct drm_fb_helper_connector *fb_helper_conn;
111 int i;
112
113 for (i = 0; i < fb_helper->connector_count; i++) {
114 struct drm_cmdline_mode *mode;
115 struct drm_connector *connector;
116 char *option = NULL;
117
118 fb_helper_conn = fb_helper->connector_info[i];
119 connector = fb_helper_conn->connector;
120 mode = &fb_helper_conn->cmdline_mode;
121
122 /* do something on return - turn off connector maybe */
123 if (fb_get_options(drm_get_connector_name(connector), &option))
124 continue;
125
126 if (drm_mode_parse_command_line_for_connector(option,
127 connector,
128 mode)) {
129 if (mode->force) {
130 const char *s;
131 switch (mode->force) {
132 case DRM_FORCE_OFF:
133 s = "OFF";
134 break;
135 case DRM_FORCE_ON_DIGITAL:
136 s = "ON - dig";
137 break;
138 default:
139 case DRM_FORCE_ON:
140 s = "ON";
141 break;
142 }
143
144 DRM_INFO("forcing %s connector %s\n",
145 drm_get_connector_name(connector), s);
146 connector->force = mode->force;
147 }
148
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
150 drm_get_connector_name(connector),
151 mode->xres, mode->yres,
152 mode->refresh_specified ? mode->refresh : 60,
153 mode->rb ? " reduced blanking" : "",
154 mode->margins ? " with margins" : "",
155 mode->interlace ? " interlaced" : "");
156 }
157
158 }
159 return 0;
160}
161
162static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
163{
164 uint16_t *r_base, *g_base, *b_base;
165 int i;
166
167 if (helper->funcs->gamma_get == NULL)
168 return;
169
170 r_base = crtc->gamma_store;
171 g_base = r_base + crtc->gamma_size;
172 b_base = g_base + crtc->gamma_size;
173
174 for (i = 0; i < crtc->gamma_size; i++)
175 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
176}
177
178static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
179{
180 uint16_t *r_base, *g_base, *b_base;
181
182 if (crtc->funcs->gamma_set == NULL)
183 return;
184
185 r_base = crtc->gamma_store;
186 g_base = r_base + crtc->gamma_size;
187 b_base = g_base + crtc->gamma_size;
188
189 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
190}
191
192/**
193 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
194 * @info: fbdev registered by the helper
195 */
196int drm_fb_helper_debug_enter(struct fb_info *info)
197{
198 struct drm_fb_helper *helper = info->par;
199 struct drm_crtc_helper_funcs *funcs;
200 int i;
201
202 if (list_empty(&kernel_fb_helper_list))
203 return false;
204
205 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
206 for (i = 0; i < helper->crtc_count; i++) {
207 struct drm_mode_set *mode_set =
208 &helper->crtc_info[i].mode_set;
209
210 if (!mode_set->crtc->enabled)
211 continue;
212
213 funcs = mode_set->crtc->helper_private;
214 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
215 funcs->mode_set_base_atomic(mode_set->crtc,
216 mode_set->fb,
217 mode_set->x,
218 mode_set->y,
219 ENTER_ATOMIC_MODE_SET);
220 }
221 }
222
223 return 0;
224}
225EXPORT_SYMBOL(drm_fb_helper_debug_enter);
226
227/* Find the real fb for a given fb helper CRTC */
228static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
229{
230 struct drm_device *dev = crtc->dev;
231 struct drm_crtc *c;
232
233 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
234 if (crtc->base.id == c->base.id)
235 return c->primary->fb;
236 }
237
238 return NULL;
239}
240
241/**
242 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
243 * @info: fbdev registered by the helper
244 */
245int drm_fb_helper_debug_leave(struct fb_info *info)
246{
247 struct drm_fb_helper *helper = info->par;
248 struct drm_crtc *crtc;
249 struct drm_crtc_helper_funcs *funcs;
250 struct drm_framebuffer *fb;
251 int i;
252
253 for (i = 0; i < helper->crtc_count; i++) {
254 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
255 crtc = mode_set->crtc;
256 funcs = crtc->helper_private;
257 fb = drm_mode_config_fb(crtc);
258
259 if (!crtc->enabled)
260 continue;
261
262 if (!fb) {
263 DRM_ERROR("no fb to restore??\n");
264 continue;
265 }
266
267 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
268 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
269 crtc->y, LEAVE_ATOMIC_MODE_SET);
270 }
271
272 return 0;
273}
274EXPORT_SYMBOL(drm_fb_helper_debug_leave);
275
276/**
277 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
278 * @fb_helper: fbcon to restore
279 *
280 * This should be called from driver's drm ->lastclose callback
281 * when implementing an fbcon on top of kms using this helper. This ensures that
282 * the user isn't greeted with a black screen when e.g. X dies.
283 */
284bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
285{
286 struct drm_device *dev = fb_helper->dev;
287 struct drm_plane *plane;
288 bool error = false;
289 int i;
290
291 drm_warn_on_modeset_not_all_locked(dev);
292
293 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
294 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
295 drm_plane_force_disable(plane);
296
297 for (i = 0; i < fb_helper->crtc_count; i++) {
298 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
299 struct drm_crtc *crtc = mode_set->crtc;
300 int ret;
301
302 if (crtc->funcs->cursor_set) {
303 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
304 if (ret)
305 error = true;
306 }
307
308 ret = drm_mode_set_config_internal(mode_set);
309 if (ret)
310 error = true;
311 }
312 return error;
313}
314EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
315
316/*
317 * restore fbcon display for all kms driver's using this helper, used for sysrq
318 * and panic handling.
319 */
320static bool drm_fb_helper_force_kernel_mode(void)
321{
322 bool ret, error = false;
323 struct drm_fb_helper *helper;
324
325 if (list_empty(&kernel_fb_helper_list))
326 return false;
327
328 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
329 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
330 continue;
331
332 ret = drm_fb_helper_restore_fbdev_mode(helper);
333 if (ret)
334 error = true;
335 }
336 return error;
337}
338
339static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
340 void *panic_str)
341{
342 /*
343 * It's a waste of time and effort to switch back to text console
344 * if the kernel should reboot before panic messages can be seen.
345 */
346 if (panic_timeout < 0)
347 return 0;
348
349 pr_err("panic occurred, switching back to text console\n");
350 return drm_fb_helper_force_kernel_mode();
351}
352
353static struct notifier_block paniced = {
354 .notifier_call = drm_fb_helper_panic,
355};
356
357static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
358{
359 struct drm_device *dev = fb_helper->dev;
360 struct drm_crtc *crtc;
361 int bound = 0, crtcs_bound = 0;
362
363 /* Sometimes user space wants everything disabled, so don't steal the
364 * display if there's a master. */
365 if (dev->primary->master)
366 return false;
367
368 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
369 if (crtc->primary->fb)
370 crtcs_bound++;
371 if (crtc->primary->fb == fb_helper->fb)
372 bound++;
373 }
374
375 if (bound < crtcs_bound)
376 return false;
377
378 return true;
379}
380
381#ifdef CONFIG_MAGIC_SYSRQ
382static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
383{
384 bool ret;
385 ret = drm_fb_helper_force_kernel_mode();
386 if (ret == true)
387 DRM_ERROR("Failed to restore crtc configuration\n");
388}
389static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
390
391static void drm_fb_helper_sysrq(int dummy1)
392{
393 schedule_work(&drm_fb_helper_restore_work);
394}
395
396static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
397 .handler = drm_fb_helper_sysrq,
398 .help_msg = "force-fb(V)",
399 .action_msg = "Restore framebuffer console",
400};
401#else
402static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
403#endif
404
405static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
406{
407 struct drm_fb_helper *fb_helper = info->par;
408 struct drm_device *dev = fb_helper->dev;
409 struct drm_crtc *crtc;
410 struct drm_connector *connector;
411 int i, j;
412
413 /*
414 * fbdev->blank can be called from irq context in case of a panic.
415 * Since we already have our own special panic handler which will
416 * restore the fbdev console mode completely, just bail out early.
417 */
418 if (oops_in_progress)
419 return;
420
421 /*
422 * For each CRTC in this fb, turn the connectors on/off.
423 */
424 drm_modeset_lock_all(dev);
425 if (!drm_fb_helper_is_bound(fb_helper)) {
426 drm_modeset_unlock_all(dev);
427 return;
428 }
429
430 for (i = 0; i < fb_helper->crtc_count; i++) {
431 crtc = fb_helper->crtc_info[i].mode_set.crtc;
432
433 if (!crtc->enabled)
434 continue;
435
436 /* Walk the connectors & encoders on this fb turning them on/off */
437 for (j = 0; j < fb_helper->connector_count; j++) {
438 connector = fb_helper->connector_info[j]->connector;
439 connector->funcs->dpms(connector, dpms_mode);
440 drm_object_property_set_value(&connector->base,
441 dev->mode_config.dpms_property, dpms_mode);
442 }
443 }
444 drm_modeset_unlock_all(dev);
445}
446
447/**
448 * drm_fb_helper_blank - implementation for ->fb_blank
449 * @blank: desired blanking state
450 * @info: fbdev registered by the helper
451 */
452int drm_fb_helper_blank(int blank, struct fb_info *info)
453{
454 switch (blank) {
455 /* Display: On; HSync: On, VSync: On */
456 case FB_BLANK_UNBLANK:
457 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
458 break;
459 /* Display: Off; HSync: On, VSync: On */
460 case FB_BLANK_NORMAL:
461 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
462 break;
463 /* Display: Off; HSync: Off, VSync: On */
464 case FB_BLANK_HSYNC_SUSPEND:
465 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
466 break;
467 /* Display: Off; HSync: On, VSync: Off */
468 case FB_BLANK_VSYNC_SUSPEND:
469 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
470 break;
471 /* Display: Off; HSync: Off, VSync: Off */
472 case FB_BLANK_POWERDOWN:
473 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
474 break;
475 }
476 return 0;
477}
478EXPORT_SYMBOL(drm_fb_helper_blank);
479
480static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
481{
482 int i;
483
484 for (i = 0; i < helper->connector_count; i++)
485 kfree(helper->connector_info[i]);
486 kfree(helper->connector_info);
487 for (i = 0; i < helper->crtc_count; i++) {
488 kfree(helper->crtc_info[i].mode_set.connectors);
489 if (helper->crtc_info[i].mode_set.mode)
490 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
491 }
492 kfree(helper->crtc_info);
493}
494
495/**
496 * drm_fb_helper_init - initialize a drm_fb_helper structure
497 * @dev: drm device
498 * @fb_helper: driver-allocated fbdev helper structure to initialize
499 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
500 * @max_conn_count: max connector count
501 *
502 * This allocates the structures for the fbdev helper with the given limits.
503 * Note that this won't yet touch the hardware (through the driver interfaces)
504 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
505 * to allow driver writes more control over the exact init sequence.
506 *
507 * Drivers must set fb_helper->funcs before calling
508 * drm_fb_helper_initial_config().
509 *
510 * RETURNS:
511 * Zero if everything went ok, nonzero otherwise.
512 */
513int drm_fb_helper_init(struct drm_device *dev,
514 struct drm_fb_helper *fb_helper,
515 int crtc_count, int max_conn_count)
516{
517 struct drm_crtc *crtc;
518 int i;
519
520 if (!max_conn_count)
521 return -EINVAL;
522
523 fb_helper->dev = dev;
524
525 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
526
527 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
528 if (!fb_helper->crtc_info)
529 return -ENOMEM;
530
531 fb_helper->crtc_count = crtc_count;
532 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
533 if (!fb_helper->connector_info) {
534 kfree(fb_helper->crtc_info);
535 return -ENOMEM;
536 }
537 fb_helper->connector_count = 0;
538
539 for (i = 0; i < crtc_count; i++) {
540 fb_helper->crtc_info[i].mode_set.connectors =
541 kcalloc(max_conn_count,
542 sizeof(struct drm_connector *),
543 GFP_KERNEL);
544
545 if (!fb_helper->crtc_info[i].mode_set.connectors)
546 goto out_free;
547 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
548 }
549
550 i = 0;
551 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
552 fb_helper->crtc_info[i].mode_set.crtc = crtc;
553 i++;
554 }
555
556 return 0;
557out_free:
558 drm_fb_helper_crtc_free(fb_helper);
559 return -ENOMEM;
560}
561EXPORT_SYMBOL(drm_fb_helper_init);
562
563void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
564{
565 if (!list_empty(&fb_helper->kernel_fb_list)) {
566 list_del(&fb_helper->kernel_fb_list);
567 if (list_empty(&kernel_fb_helper_list)) {
568 pr_info("drm: unregistered panic notifier\n");
569 atomic_notifier_chain_unregister(&panic_notifier_list,
570 &paniced);
571 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
572 }
573 }
574
575 drm_fb_helper_crtc_free(fb_helper);
576
577}
578EXPORT_SYMBOL(drm_fb_helper_fini);
579
580static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
581 u16 blue, u16 regno, struct fb_info *info)
582{
583 struct drm_fb_helper *fb_helper = info->par;
584 struct drm_framebuffer *fb = fb_helper->fb;
585 int pindex;
586
587 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
588 u32 *palette;
589 u32 value;
590 /* place color in psuedopalette */
591 if (regno > 16)
592 return -EINVAL;
593 palette = (u32 *)info->pseudo_palette;
594 red >>= (16 - info->var.red.length);
595 green >>= (16 - info->var.green.length);
596 blue >>= (16 - info->var.blue.length);
597 value = (red << info->var.red.offset) |
598 (green << info->var.green.offset) |
599 (blue << info->var.blue.offset);
600 if (info->var.transp.length > 0) {
601 u32 mask = (1 << info->var.transp.length) - 1;
602 mask <<= info->var.transp.offset;
603 value |= mask;
604 }
605 palette[regno] = value;
606 return 0;
607 }
608
609 /*
610 * The driver really shouldn't advertise pseudo/directcolor
611 * visuals if it can't deal with the palette.
612 */
613 if (WARN_ON(!fb_helper->funcs->gamma_set ||
614 !fb_helper->funcs->gamma_get))
615 return -EINVAL;
616
617 pindex = regno;
618
619 if (fb->bits_per_pixel == 16) {
620 pindex = regno << 3;
621
622 if (fb->depth == 16 && regno > 63)
623 return -EINVAL;
624 if (fb->depth == 15 && regno > 31)
625 return -EINVAL;
626
627 if (fb->depth == 16) {
628 u16 r, g, b;
629 int i;
630 if (regno < 32) {
631 for (i = 0; i < 8; i++)
632 fb_helper->funcs->gamma_set(crtc, red,
633 green, blue, pindex + i);
634 }
635
636 fb_helper->funcs->gamma_get(crtc, &r,
637 &g, &b,
638 pindex >> 1);
639
640 for (i = 0; i < 4; i++)
641 fb_helper->funcs->gamma_set(crtc, r,
642 green, b,
643 (pindex >> 1) + i);
644 }
645 }
646
647 if (fb->depth != 16)
648 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
649 return 0;
650}
651
652/**
653 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
654 * @cmap: cmap to set
655 * @info: fbdev registered by the helper
656 */
657int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
658{
659 struct drm_fb_helper *fb_helper = info->par;
660 struct drm_device *dev = fb_helper->dev;
661 struct drm_crtc_helper_funcs *crtc_funcs;
662 u16 *red, *green, *blue, *transp;
663 struct drm_crtc *crtc;
664 int i, j, rc = 0;
665 int start;
666
667 drm_modeset_lock_all(dev);
668 if (!drm_fb_helper_is_bound(fb_helper)) {
669 drm_modeset_unlock_all(dev);
670 return -EBUSY;
671 }
672
673 for (i = 0; i < fb_helper->crtc_count; i++) {
674 crtc = fb_helper->crtc_info[i].mode_set.crtc;
675 crtc_funcs = crtc->helper_private;
676
677 red = cmap->red;
678 green = cmap->green;
679 blue = cmap->blue;
680 transp = cmap->transp;
681 start = cmap->start;
682
683 for (j = 0; j < cmap->len; j++) {
684 u16 hred, hgreen, hblue, htransp = 0xffff;
685
686 hred = *red++;
687 hgreen = *green++;
688 hblue = *blue++;
689
690 if (transp)
691 htransp = *transp++;
692
693 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
694 if (rc)
695 goto out;
696 }
697 if (crtc_funcs->load_lut)
698 crtc_funcs->load_lut(crtc);
699 }
700 out:
701 drm_modeset_unlock_all(dev);
702 return rc;
703}
704EXPORT_SYMBOL(drm_fb_helper_setcmap);
705
706/**
707 * drm_fb_helper_check_var - implementation for ->fb_check_var
708 * @var: screeninfo to check
709 * @info: fbdev registered by the helper
710 */
711int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
712 struct fb_info *info)
713{
714 struct drm_fb_helper *fb_helper = info->par;
715 struct drm_framebuffer *fb = fb_helper->fb;
716 int depth;
717
718 if (var->pixclock != 0 || in_dbg_master())
719 return -EINVAL;
720
721 /* Need to resize the fb object !!! */
722 if (var->bits_per_pixel > fb->bits_per_pixel ||
723 var->xres > fb->width || var->yres > fb->height ||
724 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
725 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
726 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
727 var->xres, var->yres, var->bits_per_pixel,
728 var->xres_virtual, var->yres_virtual,
729 fb->width, fb->height, fb->bits_per_pixel);
730 return -EINVAL;
731 }
732
733 switch (var->bits_per_pixel) {
734 case 16:
735 depth = (var->green.length == 6) ? 16 : 15;
736 break;
737 case 32:
738 depth = (var->transp.length > 0) ? 32 : 24;
739 break;
740 default:
741 depth = var->bits_per_pixel;
742 break;
743 }
744
745 switch (depth) {
746 case 8:
747 var->red.offset = 0;
748 var->green.offset = 0;
749 var->blue.offset = 0;
750 var->red.length = 8;
751 var->green.length = 8;
752 var->blue.length = 8;
753 var->transp.length = 0;
754 var->transp.offset = 0;
755 break;
756 case 15:
757 var->red.offset = 10;
758 var->green.offset = 5;
759 var->blue.offset = 0;
760 var->red.length = 5;
761 var->green.length = 5;
762 var->blue.length = 5;
763 var->transp.length = 1;
764 var->transp.offset = 15;
765 break;
766 case 16:
767 var->red.offset = 11;
768 var->green.offset = 5;
769 var->blue.offset = 0;
770 var->red.length = 5;
771 var->green.length = 6;
772 var->blue.length = 5;
773 var->transp.length = 0;
774 var->transp.offset = 0;
775 break;
776 case 24:
777 var->red.offset = 16;
778 var->green.offset = 8;
779 var->blue.offset = 0;
780 var->red.length = 8;
781 var->green.length = 8;
782 var->blue.length = 8;
783 var->transp.length = 0;
784 var->transp.offset = 0;
785 break;
786 case 32:
787 var->red.offset = 16;
788 var->green.offset = 8;
789 var->blue.offset = 0;
790 var->red.length = 8;
791 var->green.length = 8;
792 var->blue.length = 8;
793 var->transp.length = 8;
794 var->transp.offset = 24;
795 break;
796 default:
797 return -EINVAL;
798 }
799 return 0;
800}
801EXPORT_SYMBOL(drm_fb_helper_check_var);
802
803/**
804 * drm_fb_helper_set_par - implementation for ->fb_set_par
805 * @info: fbdev registered by the helper
806 *
807 * This will let fbcon do the mode init and is called at initialization time by
808 * the fbdev core when registering the driver, and later on through the hotplug
809 * callback.
810 */
811int drm_fb_helper_set_par(struct fb_info *info)
812{
813 struct drm_fb_helper *fb_helper = info->par;
814 struct drm_device *dev = fb_helper->dev;
815 struct fb_var_screeninfo *var = &info->var;
816
817 if (var->pixclock != 0) {
818 DRM_ERROR("PIXEL CLOCK SET\n");
819 return -EINVAL;
820 }
821
822 drm_modeset_lock_all(dev);
823 drm_fb_helper_restore_fbdev_mode(fb_helper);
824 drm_modeset_unlock_all(dev);
825
826 if (fb_helper->delayed_hotplug) {
827 fb_helper->delayed_hotplug = false;
828 drm_fb_helper_hotplug_event(fb_helper);
829 }
830 return 0;
831}
832EXPORT_SYMBOL(drm_fb_helper_set_par);
833
834/**
835 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
836 * @var: updated screen information
837 * @info: fbdev registered by the helper
838 */
839int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
840 struct fb_info *info)
841{
842 struct drm_fb_helper *fb_helper = info->par;
843 struct drm_device *dev = fb_helper->dev;
844 struct drm_mode_set *modeset;
845 int ret = 0;
846 int i;
847
848 drm_modeset_lock_all(dev);
849 if (!drm_fb_helper_is_bound(fb_helper)) {
850 drm_modeset_unlock_all(dev);
851 return -EBUSY;
852 }
853
854 for (i = 0; i < fb_helper->crtc_count; i++) {
855 modeset = &fb_helper->crtc_info[i].mode_set;
856
857 modeset->x = var->xoffset;
858 modeset->y = var->yoffset;
859
860 if (modeset->num_connectors) {
861 ret = drm_mode_set_config_internal(modeset);
862 if (!ret) {
863 info->var.xoffset = var->xoffset;
864 info->var.yoffset = var->yoffset;
865 }
866 }
867 }
868 drm_modeset_unlock_all(dev);
869 return ret;
870}
871EXPORT_SYMBOL(drm_fb_helper_pan_display);
872
873/*
874 * Allocates the backing storage and sets up the fbdev info structure through
875 * the ->fb_probe callback and then registers the fbdev and sets up the panic
876 * notifier.
877 */
878static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
879 int preferred_bpp)
880{
881 int ret = 0;
882 int crtc_count = 0;
883 int i;
884 struct fb_info *info;
885 struct drm_fb_helper_surface_size sizes;
886 int gamma_size = 0;
887
888 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
889 sizes.surface_depth = 24;
890 sizes.surface_bpp = 32;
891 sizes.fb_width = (unsigned)-1;
892 sizes.fb_height = (unsigned)-1;
893
894 /* if driver picks 8 or 16 by default use that
895 for both depth/bpp */
896 if (preferred_bpp != sizes.surface_bpp)
897 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
898
899 /* first up get a count of crtcs now in use and new min/maxes width/heights */
900 for (i = 0; i < fb_helper->connector_count; i++) {
901 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
902 struct drm_cmdline_mode *cmdline_mode;
903
904 cmdline_mode = &fb_helper_conn->cmdline_mode;
905
906 if (cmdline_mode->bpp_specified) {
907 switch (cmdline_mode->bpp) {
908 case 8:
909 sizes.surface_depth = sizes.surface_bpp = 8;
910 break;
911 case 15:
912 sizes.surface_depth = 15;
913 sizes.surface_bpp = 16;
914 break;
915 case 16:
916 sizes.surface_depth = sizes.surface_bpp = 16;
917 break;
918 case 24:
919 sizes.surface_depth = sizes.surface_bpp = 24;
920 break;
921 case 32:
922 sizes.surface_depth = 24;
923 sizes.surface_bpp = 32;
924 break;
925 }
926 break;
927 }
928 }
929
930 crtc_count = 0;
931 for (i = 0; i < fb_helper->crtc_count; i++) {
932 struct drm_display_mode *desired_mode;
933 desired_mode = fb_helper->crtc_info[i].desired_mode;
934
935 if (desired_mode) {
936 if (gamma_size == 0)
937 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
938 if (desired_mode->hdisplay < sizes.fb_width)
939 sizes.fb_width = desired_mode->hdisplay;
940 if (desired_mode->vdisplay < sizes.fb_height)
941 sizes.fb_height = desired_mode->vdisplay;
942 if (desired_mode->hdisplay > sizes.surface_width)
943 sizes.surface_width = desired_mode->hdisplay;
944 if (desired_mode->vdisplay > sizes.surface_height)
945 sizes.surface_height = desired_mode->vdisplay;
946 crtc_count++;
947 }
948 }
949
950 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
951 /* hmm everyone went away - assume VGA cable just fell out
952 and will come back later. */
953 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
954 sizes.fb_width = sizes.surface_width = 1024;
955 sizes.fb_height = sizes.surface_height = 768;
956 }
957
958 /* push down into drivers */
959 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
960 if (ret < 0)
961 return ret;
962
963 info = fb_helper->fbdev;
964
965 /*
966 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
967 * events, but at init time drm_setup_crtcs needs to be called before
968 * the fb is allocated (since we need to figure out the desired size of
969 * the fb before we can allocate it ...). Hence we need to fix things up
970 * here again.
971 */
972 for (i = 0; i < fb_helper->crtc_count; i++)
973 if (fb_helper->crtc_info[i].mode_set.num_connectors)
974 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
975
976
977 info->var.pixclock = 0;
978 if (register_framebuffer(info) < 0)
979 return -EINVAL;
980
981 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
982 info->node, info->fix.id);
983
984 /* Switch back to kernel console on panic */
985 /* multi card linked list maybe */
986 if (list_empty(&kernel_fb_helper_list)) {
987 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
988 atomic_notifier_chain_register(&panic_notifier_list,
989 &paniced);
990 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
991 }
992
993 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
994
995 return 0;
996}
997
998/**
999 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1000 * @info: fbdev registered by the helper
1001 * @pitch: desired pitch
1002 * @depth: desired depth
1003 *
1004 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1005 * fbdev emulations. Drivers which support acceleration methods which impose
1006 * additional constraints need to set up their own limits.
1007 *
1008 * Drivers should call this (or their equivalent setup code) from their
1009 * ->fb_probe callback.
1010 */
1011void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1012 uint32_t depth)
1013{
1014 info->fix.type = FB_TYPE_PACKED_PIXELS;
1015 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1016 FB_VISUAL_TRUECOLOR;
1017 info->fix.mmio_start = 0;
1018 info->fix.mmio_len = 0;
1019 info->fix.type_aux = 0;
1020 info->fix.xpanstep = 1; /* doing it in hw */
1021 info->fix.ypanstep = 1; /* doing it in hw */
1022 info->fix.ywrapstep = 0;
1023 info->fix.accel = FB_ACCEL_NONE;
1024 info->fix.type_aux = 0;
1025
1026 info->fix.line_length = pitch;
1027 return;
1028}
1029EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1030
1031/**
1032 * drm_fb_helper_fill_var - initalizes variable fbdev information
1033 * @info: fbdev instance to set up
1034 * @fb_helper: fb helper instance to use as template
1035 * @fb_width: desired fb width
1036 * @fb_height: desired fb height
1037 *
1038 * Sets up the variable fbdev metainformation from the given fb helper instance
1039 * and the drm framebuffer allocated in fb_helper->fb.
1040 *
1041 * Drivers should call this (or their equivalent setup code) from their
1042 * ->fb_probe callback after having allocated the fbdev backing
1043 * storage framebuffer.
1044 */
1045void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1046 uint32_t fb_width, uint32_t fb_height)
1047{
1048 struct drm_framebuffer *fb = fb_helper->fb;
1049 info->pseudo_palette = fb_helper->pseudo_palette;
1050 info->var.xres_virtual = fb->width;
1051 info->var.yres_virtual = fb->height;
1052 info->var.bits_per_pixel = fb->bits_per_pixel;
1053 info->var.accel_flags = FB_ACCELF_TEXT;
1054 info->var.xoffset = 0;
1055 info->var.yoffset = 0;
1056 info->var.activate = FB_ACTIVATE_NOW;
1057 info->var.height = -1;
1058 info->var.width = -1;
1059
1060 switch (fb->depth) {
1061 case 8:
1062 info->var.red.offset = 0;
1063 info->var.green.offset = 0;
1064 info->var.blue.offset = 0;
1065 info->var.red.length = 8; /* 8bit DAC */
1066 info->var.green.length = 8;
1067 info->var.blue.length = 8;
1068 info->var.transp.offset = 0;
1069 info->var.transp.length = 0;
1070 break;
1071 case 15:
1072 info->var.red.offset = 10;
1073 info->var.green.offset = 5;
1074 info->var.blue.offset = 0;
1075 info->var.red.length = 5;
1076 info->var.green.length = 5;
1077 info->var.blue.length = 5;
1078 info->var.transp.offset = 15;
1079 info->var.transp.length = 1;
1080 break;
1081 case 16:
1082 info->var.red.offset = 11;
1083 info->var.green.offset = 5;
1084 info->var.blue.offset = 0;
1085 info->var.red.length = 5;
1086 info->var.green.length = 6;
1087 info->var.blue.length = 5;
1088 info->var.transp.offset = 0;
1089 break;
1090 case 24:
1091 info->var.red.offset = 16;
1092 info->var.green.offset = 8;
1093 info->var.blue.offset = 0;
1094 info->var.red.length = 8;
1095 info->var.green.length = 8;
1096 info->var.blue.length = 8;
1097 info->var.transp.offset = 0;
1098 info->var.transp.length = 0;
1099 break;
1100 case 32:
1101 info->var.red.offset = 16;
1102 info->var.green.offset = 8;
1103 info->var.blue.offset = 0;
1104 info->var.red.length = 8;
1105 info->var.green.length = 8;
1106 info->var.blue.length = 8;
1107 info->var.transp.offset = 24;
1108 info->var.transp.length = 8;
1109 break;
1110 default:
1111 break;
1112 }
1113
1114 info->var.xres = fb_width;
1115 info->var.yres = fb_height;
1116}
1117EXPORT_SYMBOL(drm_fb_helper_fill_var);
1118
1119static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1120 uint32_t maxX,
1121 uint32_t maxY)
1122{
1123 struct drm_connector *connector;
1124 int count = 0;
1125 int i;
1126
1127 for (i = 0; i < fb_helper->connector_count; i++) {
1128 connector = fb_helper->connector_info[i]->connector;
1129 count += connector->funcs->fill_modes(connector, maxX, maxY);
1130 }
1131
1132 return count;
1133}
1134
1135struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1136{
1137 struct drm_display_mode *mode;
1138
1139 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1140 if (mode->hdisplay > width ||
1141 mode->vdisplay > height)
1142 continue;
1143 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1144 return mode;
1145 }
1146 return NULL;
1147}
1148EXPORT_SYMBOL(drm_has_preferred_mode);
1149
1150static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1151{
1152 struct drm_cmdline_mode *cmdline_mode;
1153 cmdline_mode = &fb_connector->cmdline_mode;
1154 return cmdline_mode->specified;
1155}
1156
1157struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1158 int width, int height)
1159{
1160 struct drm_cmdline_mode *cmdline_mode;
1161 struct drm_display_mode *mode = NULL;
1162 bool prefer_non_interlace;
1163
1164 cmdline_mode = &fb_helper_conn->cmdline_mode;
1165 if (cmdline_mode->specified == false)
1166 return mode;
1167
1168 /* attempt to find a matching mode in the list of modes
1169 * we have gotten so far, if not add a CVT mode that conforms
1170 */
1171 if (cmdline_mode->rb || cmdline_mode->margins)
1172 goto create_mode;
1173
1174 prefer_non_interlace = !cmdline_mode->interlace;
1175 again:
1176 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1177 /* check width/height */
1178 if (mode->hdisplay != cmdline_mode->xres ||
1179 mode->vdisplay != cmdline_mode->yres)
1180 continue;
1181
1182 if (cmdline_mode->refresh_specified) {
1183 if (mode->vrefresh != cmdline_mode->refresh)
1184 continue;
1185 }
1186
1187 if (cmdline_mode->interlace) {
1188 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1189 continue;
1190 } else if (prefer_non_interlace) {
1191 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1192 continue;
1193 }
1194 return mode;
1195 }
1196
1197 if (prefer_non_interlace) {
1198 prefer_non_interlace = false;
1199 goto again;
1200 }
1201
1202create_mode:
1203 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1204 cmdline_mode);
1205 list_add(&mode->head, &fb_helper_conn->connector->modes);
1206 return mode;
1207}
1208EXPORT_SYMBOL(drm_pick_cmdline_mode);
1209
1210static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1211{
1212 bool enable;
1213
1214 if (strict)
1215 enable = connector->status == connector_status_connected;
1216 else
1217 enable = connector->status != connector_status_disconnected;
1218
1219 return enable;
1220}
1221
1222static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1223 bool *enabled)
1224{
1225 bool any_enabled = false;
1226 struct drm_connector *connector;
1227 int i = 0;
1228
1229 for (i = 0; i < fb_helper->connector_count; i++) {
1230 connector = fb_helper->connector_info[i]->connector;
1231 enabled[i] = drm_connector_enabled(connector, true);
1232 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1233 enabled[i] ? "yes" : "no");
1234 any_enabled |= enabled[i];
1235 }
1236
1237 if (any_enabled)
1238 return;
1239
1240 for (i = 0; i < fb_helper->connector_count; i++) {
1241 connector = fb_helper->connector_info[i]->connector;
1242 enabled[i] = drm_connector_enabled(connector, false);
1243 }
1244}
1245
1246static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1247 struct drm_display_mode **modes,
1248 bool *enabled, int width, int height)
1249{
1250 int count, i, j;
1251 bool can_clone = false;
1252 struct drm_fb_helper_connector *fb_helper_conn;
1253 struct drm_display_mode *dmt_mode, *mode;
1254
1255 /* only contemplate cloning in the single crtc case */
1256 if (fb_helper->crtc_count > 1)
1257 return false;
1258
1259 count = 0;
1260 for (i = 0; i < fb_helper->connector_count; i++) {
1261 if (enabled[i])
1262 count++;
1263 }
1264
1265 /* only contemplate cloning if more than one connector is enabled */
1266 if (count <= 1)
1267 return false;
1268
1269 /* check the command line or if nothing common pick 1024x768 */
1270 can_clone = true;
1271 for (i = 0; i < fb_helper->connector_count; i++) {
1272 if (!enabled[i])
1273 continue;
1274 fb_helper_conn = fb_helper->connector_info[i];
1275 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1276 if (!modes[i]) {
1277 can_clone = false;
1278 break;
1279 }
1280 for (j = 0; j < i; j++) {
1281 if (!enabled[j])
1282 continue;
1283 if (!drm_mode_equal(modes[j], modes[i]))
1284 can_clone = false;
1285 }
1286 }
1287
1288 if (can_clone) {
1289 DRM_DEBUG_KMS("can clone using command line\n");
1290 return true;
1291 }
1292
1293 /* try and find a 1024x768 mode on each connector */
1294 can_clone = true;
1295 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1296
1297 for (i = 0; i < fb_helper->connector_count; i++) {
1298
1299 if (!enabled[i])
1300 continue;
1301
1302 fb_helper_conn = fb_helper->connector_info[i];
1303 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1304 if (drm_mode_equal(mode, dmt_mode))
1305 modes[i] = mode;
1306 }
1307 if (!modes[i])
1308 can_clone = false;
1309 }
1310
1311 if (can_clone) {
1312 DRM_DEBUG_KMS("can clone using 1024x768\n");
1313 return true;
1314 }
1315 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1316 return false;
1317}
1318
1319static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1320 struct drm_display_mode **modes,
1321 bool *enabled, int width, int height)
1322{
1323 struct drm_fb_helper_connector *fb_helper_conn;
1324 int i;
1325
1326 for (i = 0; i < fb_helper->connector_count; i++) {
1327 fb_helper_conn = fb_helper->connector_info[i];
1328
1329 if (enabled[i] == false)
1330 continue;
1331
1332 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1333 fb_helper_conn->connector->base.id);
1334
1335 /* got for command line mode first */
1336 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1337 if (!modes[i]) {
1338 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1339 fb_helper_conn->connector->base.id);
1340 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1341 }
1342 /* No preferred modes, pick one off the list */
1343 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1344 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1345 break;
1346 }
1347 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1348 "none");
1349 }
1350 return true;
1351}
1352
1353static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1354 struct drm_fb_helper_crtc **best_crtcs,
1355 struct drm_display_mode **modes,
1356 int n, int width, int height)
1357{
1358 int c, o;
1359 struct drm_device *dev = fb_helper->dev;
1360 struct drm_connector *connector;
1361 struct drm_connector_helper_funcs *connector_funcs;
1362 struct drm_encoder *encoder;
1363 int my_score, best_score, score;
1364 struct drm_fb_helper_crtc **crtcs, *crtc;
1365 struct drm_fb_helper_connector *fb_helper_conn;
1366
1367 if (n == fb_helper->connector_count)
1368 return 0;
1369
1370 fb_helper_conn = fb_helper->connector_info[n];
1371 connector = fb_helper_conn->connector;
1372
1373 best_crtcs[n] = NULL;
1374 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1375 if (modes[n] == NULL)
1376 return best_score;
1377
1378 crtcs = kzalloc(dev->mode_config.num_connector *
1379 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1380 if (!crtcs)
1381 return best_score;
1382
1383 my_score = 1;
1384 if (connector->status == connector_status_connected)
1385 my_score++;
1386 if (drm_has_cmdline_mode(fb_helper_conn))
1387 my_score++;
1388 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1389 my_score++;
1390
1391 connector_funcs = connector->helper_private;
1392 encoder = connector_funcs->best_encoder(connector);
1393 if (!encoder)
1394 goto out;
1395
1396 /* select a crtc for this connector and then attempt to configure
1397 remaining connectors */
1398 for (c = 0; c < fb_helper->crtc_count; c++) {
1399 crtc = &fb_helper->crtc_info[c];
1400
1401 if ((encoder->possible_crtcs & (1 << c)) == 0)
1402 continue;
1403
1404 for (o = 0; o < n; o++)
1405 if (best_crtcs[o] == crtc)
1406 break;
1407
1408 if (o < n) {
1409 /* ignore cloning unless only a single crtc */
1410 if (fb_helper->crtc_count > 1)
1411 continue;
1412
1413 if (!drm_mode_equal(modes[o], modes[n]))
1414 continue;
1415 }
1416
1417 crtcs[n] = crtc;
1418 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1419 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1420 width, height);
1421 if (score > best_score) {
1422 best_score = score;
1423 memcpy(best_crtcs, crtcs,
1424 dev->mode_config.num_connector *
1425 sizeof(struct drm_fb_helper_crtc *));
1426 }
1427 }
1428out:
1429 kfree(crtcs);
1430 return best_score;
1431}
1432
1433static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1434{
1435 struct drm_device *dev = fb_helper->dev;
1436 struct drm_fb_helper_crtc **crtcs;
1437 struct drm_display_mode **modes;
1438 struct drm_mode_set *modeset;
1439 bool *enabled;
1440 int width, height;
1441 int i;
1442
1443 DRM_DEBUG_KMS("\n");
1444
1445 width = dev->mode_config.max_width;
1446 height = dev->mode_config.max_height;
1447
1448 crtcs = kcalloc(dev->mode_config.num_connector,
1449 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1450 modes = kcalloc(dev->mode_config.num_connector,
1451 sizeof(struct drm_display_mode *), GFP_KERNEL);
1452 enabled = kcalloc(dev->mode_config.num_connector,
1453 sizeof(bool), GFP_KERNEL);
1454 if (!crtcs || !modes || !enabled) {
1455 DRM_ERROR("Memory allocation failed\n");
1456 goto out;
1457 }
1458
1459
1460 drm_enable_connectors(fb_helper, enabled);
1461
1462 if (!(fb_helper->funcs->initial_config &&
1463 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1464 enabled, width, height))) {
1465 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1466 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1467
1468 if (!drm_target_cloned(fb_helper,
1469 modes, enabled, width, height) &&
1470 !drm_target_preferred(fb_helper,
1471 modes, enabled, width, height))
1472 DRM_ERROR("Unable to find initial modes\n");
1473
1474 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1475 width, height);
1476
1477 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1478 }
1479
1480 /* need to set the modesets up here for use later */
1481 /* fill out the connector<->crtc mappings into the modesets */
1482 for (i = 0; i < fb_helper->crtc_count; i++) {
1483 modeset = &fb_helper->crtc_info[i].mode_set;
1484 modeset->num_connectors = 0;
1485 modeset->fb = NULL;
1486 }
1487
1488 for (i = 0; i < fb_helper->connector_count; i++) {
1489 struct drm_display_mode *mode = modes[i];
1490 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1491 modeset = &fb_crtc->mode_set;
1492
1493 if (mode && fb_crtc) {
1494 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1495 mode->name, fb_crtc->mode_set.crtc->base.id);
1496 fb_crtc->desired_mode = mode;
1497 if (modeset->mode)
1498 drm_mode_destroy(dev, modeset->mode);
1499 modeset->mode = drm_mode_duplicate(dev,
1500 fb_crtc->desired_mode);
1501 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1502 modeset->fb = fb_helper->fb;
1503 }
1504 }
1505
1506 /* Clear out any old modes if there are no more connected outputs. */
1507 for (i = 0; i < fb_helper->crtc_count; i++) {
1508 modeset = &fb_helper->crtc_info[i].mode_set;
1509 if (modeset->num_connectors == 0) {
1510 BUG_ON(modeset->fb);
1511 BUG_ON(modeset->num_connectors);
1512 if (modeset->mode)
1513 drm_mode_destroy(dev, modeset->mode);
1514 modeset->mode = NULL;
1515 }
1516 }
1517out:
1518 kfree(crtcs);
1519 kfree(modes);
1520 kfree(enabled);
1521}
1522
1523/**
1524 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1525 * @fb_helper: fb_helper device struct
1526 * @bpp_sel: bpp value to use for the framebuffer configuration
1527 *
1528 * Scans the CRTCs and connectors and tries to put together an initial setup.
1529 * At the moment, this is a cloned configuration across all heads with
1530 * a new framebuffer object as the backing store.
1531 *
1532 * Note that this also registers the fbdev and so allows userspace to call into
1533 * the driver through the fbdev interfaces.
1534 *
1535 * This function will call down into the ->fb_probe callback to let
1536 * the driver allocate and initialize the fbdev info structure and the drm
1537 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1538 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1539 * values for the fbdev info structure.
1540 *
1541 * RETURNS:
1542 * Zero if everything went ok, nonzero otherwise.
1543 */
1544bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1545{
1546 struct drm_device *dev = fb_helper->dev;
1547 int count = 0;
1548
1549 drm_fb_helper_parse_command_line(fb_helper);
1550
1551 mutex_lock(&dev->mode_config.mutex);
1552 count = drm_fb_helper_probe_connector_modes(fb_helper,
1553 dev->mode_config.max_width,
1554 dev->mode_config.max_height);
1555 mutex_unlock(&dev->mode_config.mutex);
1556 /*
1557 * we shouldn't end up with no modes here.
1558 */
1559 if (count == 0)
1560 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1561
1562 drm_setup_crtcs(fb_helper);
1563
1564 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1565}
1566EXPORT_SYMBOL(drm_fb_helper_initial_config);
1567
1568/**
1569 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1570 * probing all the outputs attached to the fb
1571 * @fb_helper: the drm_fb_helper
1572 *
1573 * Scan the connectors attached to the fb_helper and try to put together a
1574 * setup after *notification of a change in output configuration.
1575 *
1576 * Called at runtime, takes the mode config locks to be able to check/change the
1577 * modeset configuration. Must be run from process context (which usually means
1578 * either the output polling work or a work item launched from the driver's
1579 * hotplug interrupt).
1580 *
1581 * Note that the driver must ensure that this is only called _after_ the fb has
1582 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1583 *
1584 * RETURNS:
1585 * 0 on success and a non-zero error code otherwise.
1586 */
1587int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1588{
1589 struct drm_device *dev = fb_helper->dev;
1590 u32 max_width, max_height;
1591
1592 if (!fb_helper->fb)
1593 return 0;
1594
1595 mutex_lock(&fb_helper->dev->mode_config.mutex);
1596 if (!drm_fb_helper_is_bound(fb_helper)) {
1597 fb_helper->delayed_hotplug = true;
1598 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1599 return 0;
1600 }
1601 DRM_DEBUG_KMS("\n");
1602
1603 max_width = fb_helper->fb->width;
1604 max_height = fb_helper->fb->height;
1605
1606 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1607 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1608
1609 drm_modeset_lock_all(dev);
1610 drm_setup_crtcs(fb_helper);
1611 drm_modeset_unlock_all(dev);
1612 drm_fb_helper_set_par(fb_helper->fbdev);
1613
1614 return 0;
1615}
1616EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1617
1618/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1619 * but the module doesn't depend on any fb console symbols. At least
1620 * attempt to load fbcon to avoid leaving the system without a usable console.
1621 */
1622#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1623static int __init drm_fb_helper_modinit(void)
1624{
1625 const char *name = "fbcon";
1626 struct module *fbcon;
1627
1628 mutex_lock(&module_mutex);
1629 fbcon = find_module(name);
1630 mutex_unlock(&module_mutex);
1631
1632 if (!fbcon)
1633 request_module_nowait(name);
1634 return 0;
1635}
1636
1637module_init(drm_fb_helper_modinit);
1638#endif