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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/pci.h>
34#include <linux/sysrq.h>
35#include <linux/vga_switcheroo.h>
36
37#include <drm/drm_atomic.h>
38#include <drm/drm_drv.h>
39#include <drm/drm_fb_helper.h>
40#include <drm/drm_fourcc.h>
41#include <drm/drm_framebuffer.h>
42#include <drm/drm_modeset_helper_vtables.h>
43#include <drm/drm_print.h>
44#include <drm/drm_vblank.h>
45
46#include "drm_internal.h"
47#include "drm_crtc_internal.h"
48
49static bool drm_fbdev_emulation = true;
50module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
51MODULE_PARM_DESC(fbdev_emulation,
52 "Enable legacy fbdev emulation [default=true]");
53
54static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
55module_param(drm_fbdev_overalloc, int, 0444);
56MODULE_PARM_DESC(drm_fbdev_overalloc,
57 "Overallocation of the fbdev buffer (%) [default="
58 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
59
60/*
61 * In order to keep user-space compatibility, we want in certain use-cases
62 * to keep leaking the fbdev physical address to the user-space program
63 * handling the fbdev buffer.
64 *
65 * This is a bad habit, essentially kept to support closed-source OpenGL
66 * drivers that should really be moved into open-source upstream projects
67 * instead of using legacy physical addresses in user space to communicate
68 * with other out-of-tree kernel modules.
69 *
70 * This module_param *should* be removed as soon as possible and be
71 * considered as a broken and legacy behaviour from a modern fbdev device.
72 */
73static bool drm_leak_fbdev_smem;
74#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
75module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
76MODULE_PARM_DESC(drm_leak_fbdev_smem,
77 "Allow unsafe leaking fbdev physical smem address [default=false]");
78#endif
79
80static LIST_HEAD(kernel_fb_helper_list);
81static DEFINE_MUTEX(kernel_fb_helper_lock);
82
83/**
84 * DOC: fbdev helpers
85 *
86 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
87 * mode setting driver. They can be used mostly independently from the crtc
88 * helper functions used by many drivers to implement the kernel mode setting
89 * interfaces. Drivers that use one of the shared memory managers, TTM, SHMEM,
90 * DMA, should instead use the corresponding fbdev emulation.
91 *
92 * For suspend/resume consider using drm_mode_config_helper_suspend() and
93 * drm_mode_config_helper_resume() which takes care of fbdev as well.
94 *
95 * All other functions exported by the fb helper library can be used to
96 * implement the fbdev driver interface by the driver.
97 *
98 * It is possible, though perhaps somewhat tricky, to implement race-free
99 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
100 * helper must be called first to initialize the minimum required to make
101 * hotplug detection work. Drivers also need to make sure to properly set up
102 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
103 * it is safe to enable interrupts and start processing hotplug events. At the
104 * same time, drivers should initialize all modeset objects such as CRTCs,
105 * encoders and connectors. To finish up the fbdev helper initialization, the
106 * drm_fb_helper_init() function is called. To probe for all attached displays
107 * and set up an initial configuration using the detected hardware, drivers
108 * should call drm_fb_helper_initial_config().
109 *
110 * If &drm_framebuffer_funcs.dirty is set, the
111 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
112 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
113 * away. This worker then calls the dirty() function ensuring that it will
114 * always run in process context since the fb_*() function could be running in
115 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
116 * callback it will also schedule dirty_work with the damage collected from the
117 * mmap page writes.
118 */
119
120static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
121{
122 uint16_t *r_base, *g_base, *b_base;
123
124 if (crtc->funcs->gamma_set == NULL)
125 return;
126
127 r_base = crtc->gamma_store;
128 g_base = r_base + crtc->gamma_size;
129 b_base = g_base + crtc->gamma_size;
130
131 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
132 crtc->gamma_size, NULL);
133}
134
135/**
136 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
137 * @info: fbdev registered by the helper
138 */
139int drm_fb_helper_debug_enter(struct fb_info *info)
140{
141 struct drm_fb_helper *helper = info->par;
142 const struct drm_crtc_helper_funcs *funcs;
143 struct drm_mode_set *mode_set;
144
145 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
146 mutex_lock(&helper->client.modeset_mutex);
147 drm_client_for_each_modeset(mode_set, &helper->client) {
148 if (!mode_set->crtc->enabled)
149 continue;
150
151 funcs = mode_set->crtc->helper_private;
152 if (funcs->mode_set_base_atomic == NULL)
153 continue;
154
155 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
156 continue;
157
158 funcs->mode_set_base_atomic(mode_set->crtc,
159 mode_set->fb,
160 mode_set->x,
161 mode_set->y,
162 ENTER_ATOMIC_MODE_SET);
163 }
164 mutex_unlock(&helper->client.modeset_mutex);
165 }
166
167 return 0;
168}
169EXPORT_SYMBOL(drm_fb_helper_debug_enter);
170
171/**
172 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
173 * @info: fbdev registered by the helper
174 */
175int drm_fb_helper_debug_leave(struct fb_info *info)
176{
177 struct drm_fb_helper *helper = info->par;
178 struct drm_client_dev *client = &helper->client;
179 struct drm_device *dev = helper->dev;
180 struct drm_crtc *crtc;
181 const struct drm_crtc_helper_funcs *funcs;
182 struct drm_mode_set *mode_set;
183 struct drm_framebuffer *fb;
184
185 mutex_lock(&client->modeset_mutex);
186 drm_client_for_each_modeset(mode_set, client) {
187 crtc = mode_set->crtc;
188 if (drm_drv_uses_atomic_modeset(crtc->dev))
189 continue;
190
191 funcs = crtc->helper_private;
192 fb = crtc->primary->fb;
193
194 if (!crtc->enabled)
195 continue;
196
197 if (!fb) {
198 drm_err(dev, "no fb to restore?\n");
199 continue;
200 }
201
202 if (funcs->mode_set_base_atomic == NULL)
203 continue;
204
205 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
206 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
207 crtc->y, LEAVE_ATOMIC_MODE_SET);
208 }
209 mutex_unlock(&client->modeset_mutex);
210
211 return 0;
212}
213EXPORT_SYMBOL(drm_fb_helper_debug_leave);
214
215static int
216__drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
217 bool force)
218{
219 bool do_delayed;
220 int ret;
221
222 if (!drm_fbdev_emulation || !fb_helper)
223 return -ENODEV;
224
225 if (READ_ONCE(fb_helper->deferred_setup))
226 return 0;
227
228 mutex_lock(&fb_helper->lock);
229 if (force) {
230 /*
231 * Yes this is the _locked version which expects the master lock
232 * to be held. But for forced restores we're intentionally
233 * racing here, see drm_fb_helper_set_par().
234 */
235 ret = drm_client_modeset_commit_locked(&fb_helper->client);
236 } else {
237 ret = drm_client_modeset_commit(&fb_helper->client);
238 }
239
240 do_delayed = fb_helper->delayed_hotplug;
241 if (do_delayed)
242 fb_helper->delayed_hotplug = false;
243 mutex_unlock(&fb_helper->lock);
244
245 if (do_delayed)
246 drm_fb_helper_hotplug_event(fb_helper);
247
248 return ret;
249}
250
251/**
252 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
253 * @fb_helper: driver-allocated fbdev helper, can be NULL
254 *
255 * This helper should be called from fbdev emulation's &drm_client_funcs.restore
256 * callback. It ensures that the user isn't greeted with a black screen when the
257 * userspace compositor releases the display device.
258 *
259 * Returns:
260 * 0 on success, or a negative errno code otherwise.
261 */
262int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
263{
264 return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
265}
266EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
267
268#ifdef CONFIG_MAGIC_SYSRQ
269/* emergency restore, don't bother with error reporting */
270static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
271{
272 struct drm_fb_helper *helper;
273
274 mutex_lock(&kernel_fb_helper_lock);
275 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
276 struct drm_device *dev = helper->dev;
277
278 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
279 continue;
280
281 mutex_lock(&helper->lock);
282 drm_client_modeset_commit_locked(&helper->client);
283 mutex_unlock(&helper->lock);
284 }
285 mutex_unlock(&kernel_fb_helper_lock);
286}
287
288static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
289
290static void drm_fb_helper_sysrq(u8 dummy1)
291{
292 schedule_work(&drm_fb_helper_restore_work);
293}
294
295static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
296 .handler = drm_fb_helper_sysrq,
297 .help_msg = "force-fb(v)",
298 .action_msg = "Restore framebuffer console",
299};
300#else
301static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
302#endif
303
304static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
305{
306 struct drm_fb_helper *fb_helper = info->par;
307
308 mutex_lock(&fb_helper->lock);
309 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
310 mutex_unlock(&fb_helper->lock);
311}
312
313/**
314 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
315 * @blank: desired blanking state
316 * @info: fbdev registered by the helper
317 */
318int drm_fb_helper_blank(int blank, struct fb_info *info)
319{
320 if (oops_in_progress)
321 return -EBUSY;
322
323 switch (blank) {
324 /* Display: On; HSync: On, VSync: On */
325 case FB_BLANK_UNBLANK:
326 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
327 break;
328 /* Display: Off; HSync: On, VSync: On */
329 case FB_BLANK_NORMAL:
330 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
331 break;
332 /* Display: Off; HSync: Off, VSync: On */
333 case FB_BLANK_HSYNC_SUSPEND:
334 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
335 break;
336 /* Display: Off; HSync: On, VSync: Off */
337 case FB_BLANK_VSYNC_SUSPEND:
338 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
339 break;
340 /* Display: Off; HSync: Off, VSync: Off */
341 case FB_BLANK_POWERDOWN:
342 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
343 break;
344 }
345 return 0;
346}
347EXPORT_SYMBOL(drm_fb_helper_blank);
348
349static void drm_fb_helper_resume_worker(struct work_struct *work)
350{
351 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
352 resume_work);
353
354 console_lock();
355 fb_set_suspend(helper->info, 0);
356 console_unlock();
357}
358
359static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
360{
361 struct drm_device *dev = helper->dev;
362 struct drm_clip_rect *clip = &helper->damage_clip;
363 struct drm_clip_rect clip_copy;
364 unsigned long flags;
365 int ret;
366
367 if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty))
368 return;
369
370 spin_lock_irqsave(&helper->damage_lock, flags);
371 clip_copy = *clip;
372 clip->x1 = clip->y1 = ~0;
373 clip->x2 = clip->y2 = 0;
374 spin_unlock_irqrestore(&helper->damage_lock, flags);
375
376 ret = helper->funcs->fb_dirty(helper, &clip_copy);
377 if (ret)
378 goto err;
379
380 return;
381
382err:
383 /*
384 * Restore damage clip rectangle on errors. The next run
385 * of the damage worker will perform the update.
386 */
387 spin_lock_irqsave(&helper->damage_lock, flags);
388 clip->x1 = min_t(u32, clip->x1, clip_copy.x1);
389 clip->y1 = min_t(u32, clip->y1, clip_copy.y1);
390 clip->x2 = max_t(u32, clip->x2, clip_copy.x2);
391 clip->y2 = max_t(u32, clip->y2, clip_copy.y2);
392 spin_unlock_irqrestore(&helper->damage_lock, flags);
393}
394
395static void drm_fb_helper_damage_work(struct work_struct *work)
396{
397 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
398
399 drm_fb_helper_fb_dirty(helper);
400}
401
402/**
403 * drm_fb_helper_prepare - setup a drm_fb_helper structure
404 * @dev: DRM device
405 * @helper: driver-allocated fbdev helper structure to set up
406 * @preferred_bpp: Preferred bits per pixel for the device.
407 * @funcs: pointer to structure of functions associate with this helper
408 *
409 * Sets up the bare minimum to make the framebuffer helper usable. This is
410 * useful to implement race-free initialization of the polling helpers.
411 */
412void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
413 unsigned int preferred_bpp,
414 const struct drm_fb_helper_funcs *funcs)
415{
416 /*
417 * Pick a preferred bpp of 32 if no value has been given. This
418 * will select XRGB8888 for the framebuffer formats. All drivers
419 * have to support XRGB8888 for backwards compatibility with legacy
420 * userspace, so it's the safe choice here.
421 *
422 * TODO: Replace struct drm_mode_config.preferred_depth and this
423 * bpp value with a preferred format that is given as struct
424 * drm_format_info. Then derive all other values from the
425 * format.
426 */
427 if (!preferred_bpp)
428 preferred_bpp = 32;
429
430 INIT_LIST_HEAD(&helper->kernel_fb_list);
431 spin_lock_init(&helper->damage_lock);
432 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
433 INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
434 helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
435 mutex_init(&helper->lock);
436 helper->funcs = funcs;
437 helper->dev = dev;
438 helper->preferred_bpp = preferred_bpp;
439}
440EXPORT_SYMBOL(drm_fb_helper_prepare);
441
442/**
443 * drm_fb_helper_unprepare - clean up a drm_fb_helper structure
444 * @fb_helper: driver-allocated fbdev helper structure to set up
445 *
446 * Cleans up the framebuffer helper. Inverse of drm_fb_helper_prepare().
447 */
448void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper)
449{
450 mutex_destroy(&fb_helper->lock);
451}
452EXPORT_SYMBOL(drm_fb_helper_unprepare);
453
454/**
455 * drm_fb_helper_init - initialize a &struct drm_fb_helper
456 * @dev: drm device
457 * @fb_helper: driver-allocated fbdev helper structure to initialize
458 *
459 * This allocates the structures for the fbdev helper with the given limits.
460 * Note that this won't yet touch the hardware (through the driver interfaces)
461 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
462 * to allow driver writes more control over the exact init sequence.
463 *
464 * Drivers must call drm_fb_helper_prepare() before calling this function.
465 *
466 * RETURNS:
467 * Zero if everything went ok, nonzero otherwise.
468 */
469int drm_fb_helper_init(struct drm_device *dev,
470 struct drm_fb_helper *fb_helper)
471{
472 int ret;
473
474 /*
475 * If this is not the generic fbdev client, initialize a drm_client
476 * without callbacks so we can use the modesets.
477 */
478 if (!fb_helper->client.funcs) {
479 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
480 if (ret)
481 return ret;
482 }
483
484 dev->fb_helper = fb_helper;
485
486 return 0;
487}
488EXPORT_SYMBOL(drm_fb_helper_init);
489
490/**
491 * drm_fb_helper_alloc_info - allocate fb_info and some of its members
492 * @fb_helper: driver-allocated fbdev helper
493 *
494 * A helper to alloc fb_info and the member cmap. Called by the driver
495 * within the struct &drm_driver.fbdev_probe callback function. Drivers do
496 * not need to release the allocated fb_info structure themselves, this is
497 * automatically done when calling drm_fb_helper_fini().
498 *
499 * RETURNS:
500 * fb_info pointer if things went okay, pointer containing error code
501 * otherwise
502 */
503struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper)
504{
505 struct device *dev = fb_helper->dev->dev;
506 struct fb_info *info;
507 int ret;
508
509 info = framebuffer_alloc(0, dev);
510 if (!info)
511 return ERR_PTR(-ENOMEM);
512
513 if (!drm_leak_fbdev_smem)
514 info->flags |= FBINFO_HIDE_SMEM_START;
515
516 ret = fb_alloc_cmap(&info->cmap, 256, 0);
517 if (ret)
518 goto err_release;
519
520 fb_helper->info = info;
521 info->skip_vt_switch = true;
522
523 info->skip_panic = drm_panic_is_enabled(fb_helper->dev);
524 return info;
525
526err_release:
527 framebuffer_release(info);
528 return ERR_PTR(ret);
529}
530EXPORT_SYMBOL(drm_fb_helper_alloc_info);
531
532/**
533 * drm_fb_helper_release_info - release fb_info and its members
534 * @fb_helper: driver-allocated fbdev helper
535 *
536 * A helper to release fb_info and the member cmap. Drivers do not
537 * need to release the allocated fb_info structure themselves, this is
538 * automatically done when calling drm_fb_helper_fini().
539 */
540void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper)
541{
542 struct fb_info *info = fb_helper->info;
543
544 if (!info)
545 return;
546
547 fb_helper->info = NULL;
548
549 if (info->cmap.len)
550 fb_dealloc_cmap(&info->cmap);
551 framebuffer_release(info);
552}
553EXPORT_SYMBOL(drm_fb_helper_release_info);
554
555/**
556 * drm_fb_helper_unregister_info - unregister fb_info framebuffer device
557 * @fb_helper: driver-allocated fbdev helper, must not be NULL
558 *
559 * A wrapper around unregister_framebuffer, to release the fb_info
560 * framebuffer device. This must be called before releasing all resources for
561 * @fb_helper by calling drm_fb_helper_fini().
562 */
563void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper)
564{
565 struct fb_info *info = fb_helper->info;
566 struct device *dev = info->device;
567
568 if (dev_is_pci(dev))
569 vga_switcheroo_client_fb_set(to_pci_dev(dev), NULL);
570 unregister_framebuffer(fb_helper->info);
571}
572EXPORT_SYMBOL(drm_fb_helper_unregister_info);
573
574/**
575 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
576 * @fb_helper: driver-allocated fbdev helper, can be NULL
577 *
578 * This cleans up all remaining resources associated with @fb_helper.
579 */
580void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
581{
582 if (!fb_helper)
583 return;
584
585 fb_helper->dev->fb_helper = NULL;
586
587 if (!drm_fbdev_emulation)
588 return;
589
590 cancel_work_sync(&fb_helper->resume_work);
591 cancel_work_sync(&fb_helper->damage_work);
592
593 drm_fb_helper_release_info(fb_helper);
594
595 mutex_lock(&kernel_fb_helper_lock);
596 if (!list_empty(&fb_helper->kernel_fb_list)) {
597 list_del(&fb_helper->kernel_fb_list);
598 if (list_empty(&kernel_fb_helper_list))
599 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
600 }
601 mutex_unlock(&kernel_fb_helper_lock);
602
603 if (!fb_helper->client.funcs)
604 drm_client_release(&fb_helper->client);
605}
606EXPORT_SYMBOL(drm_fb_helper_fini);
607
608static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u32 y,
609 u32 width, u32 height)
610{
611 struct drm_clip_rect *clip = &helper->damage_clip;
612 unsigned long flags;
613
614 spin_lock_irqsave(&helper->damage_lock, flags);
615 clip->x1 = min_t(u32, clip->x1, x);
616 clip->y1 = min_t(u32, clip->y1, y);
617 clip->x2 = max_t(u32, clip->x2, x + width);
618 clip->y2 = max_t(u32, clip->y2, y + height);
619 spin_unlock_irqrestore(&helper->damage_lock, flags);
620}
621
622static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
623 u32 width, u32 height)
624{
625 /*
626 * This function may be invoked by panic() to flush the frame
627 * buffer, where all CPUs except the panic CPU are stopped.
628 * During the following schedule_work(), the panic CPU needs
629 * the worker_pool lock, which might be held by a stopped CPU,
630 * causing schedule_work() and panic() to block. Return early on
631 * oops_in_progress to prevent this blocking.
632 */
633 if (oops_in_progress)
634 return;
635
636 drm_fb_helper_add_damage_clip(helper, x, y, width, height);
637
638 schedule_work(&helper->damage_work);
639}
640
641/*
642 * Convert memory region into area of scanlines and pixels per
643 * scanline. The parameters off and len must not reach beyond
644 * the end of the framebuffer.
645 */
646static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len,
647 struct drm_rect *clip)
648{
649 u32 line_length = info->fix.line_length;
650 u32 fb_height = info->var.yres;
651 off_t end = off + len;
652 u32 x1 = 0;
653 u32 y1 = off / line_length;
654 u32 x2 = info->var.xres;
655 u32 y2 = DIV_ROUND_UP(end, line_length);
656
657 /* Don't allow any of them beyond the bottom bound of display area */
658 if (y1 > fb_height)
659 y1 = fb_height;
660 if (y2 > fb_height)
661 y2 = fb_height;
662
663 if ((y2 - y1) == 1) {
664 /*
665 * We've only written to a single scanline. Try to reduce
666 * the number of horizontal pixels that need an update.
667 */
668 off_t bit_off = (off % line_length) * 8;
669 off_t bit_end = (end % line_length) * 8;
670
671 x1 = bit_off / info->var.bits_per_pixel;
672 x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel);
673 }
674
675 drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1);
676}
677
678/* Don't use in new code. */
679void drm_fb_helper_damage_range(struct fb_info *info, off_t off, size_t len)
680{
681 struct drm_fb_helper *fb_helper = info->par;
682 struct drm_rect damage_area;
683
684 drm_fb_helper_memory_range_to_clip(info, off, len, &damage_area);
685 drm_fb_helper_damage(fb_helper, damage_area.x1, damage_area.y1,
686 drm_rect_width(&damage_area),
687 drm_rect_height(&damage_area));
688}
689EXPORT_SYMBOL(drm_fb_helper_damage_range);
690
691/* Don't use in new code. */
692void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)
693{
694 struct drm_fb_helper *fb_helper = info->par;
695
696 drm_fb_helper_damage(fb_helper, x, y, width, height);
697}
698EXPORT_SYMBOL(drm_fb_helper_damage_area);
699
700#ifdef CONFIG_FB_DEFERRED_IO
701/**
702 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
703 * @info: fb_info struct pointer
704 * @pagereflist: list of mmap framebuffer pages that have to be flushed
705 *
706 * This function is used as the &fb_deferred_io.deferred_io
707 * callback function for flushing the fbdev mmap writes.
708 */
709void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist)
710{
711 struct drm_fb_helper *helper = info->par;
712 unsigned long start, end, min_off, max_off, total_size;
713 struct fb_deferred_io_pageref *pageref;
714 struct drm_rect damage_area;
715
716 min_off = ULONG_MAX;
717 max_off = 0;
718 list_for_each_entry(pageref, pagereflist, list) {
719 start = pageref->offset;
720 end = start + PAGE_SIZE;
721 min_off = min(min_off, start);
722 max_off = max(max_off, end);
723 }
724
725 /*
726 * As we can only track pages, we might reach beyond the end
727 * of the screen and account for non-existing scanlines. Hence,
728 * keep the covered memory area within the screen buffer.
729 */
730 if (info->screen_size)
731 total_size = info->screen_size;
732 else
733 total_size = info->fix.smem_len;
734 max_off = min(max_off, total_size);
735
736 if (min_off < max_off) {
737 drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area);
738 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
739 drm_rect_width(&damage_area),
740 drm_rect_height(&damage_area));
741 }
742}
743EXPORT_SYMBOL(drm_fb_helper_deferred_io);
744#endif
745
746/**
747 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
748 * @fb_helper: driver-allocated fbdev helper, can be NULL
749 * @suspend: whether to suspend or resume
750 *
751 * A wrapper around fb_set_suspend implemented by fbdev core.
752 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
753 * the lock yourself
754 */
755void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
756{
757 if (fb_helper && fb_helper->info)
758 fb_set_suspend(fb_helper->info, suspend);
759}
760EXPORT_SYMBOL(drm_fb_helper_set_suspend);
761
762/**
763 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
764 * takes the console lock
765 * @fb_helper: driver-allocated fbdev helper, can be NULL
766 * @suspend: whether to suspend or resume
767 *
768 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
769 * isn't available on resume, a worker is tasked with waiting for the lock
770 * to become available. The console lock can be pretty contented on resume
771 * due to all the printk activity.
772 *
773 * This function can be called multiple times with the same state since
774 * &fb_info.state is checked to see if fbdev is running or not before locking.
775 *
776 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
777 */
778void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
779 bool suspend)
780{
781 if (!fb_helper || !fb_helper->info)
782 return;
783
784 /* make sure there's no pending/ongoing resume */
785 flush_work(&fb_helper->resume_work);
786
787 if (suspend) {
788 if (fb_helper->info->state != FBINFO_STATE_RUNNING)
789 return;
790
791 console_lock();
792
793 } else {
794 if (fb_helper->info->state == FBINFO_STATE_RUNNING)
795 return;
796
797 if (!console_trylock()) {
798 schedule_work(&fb_helper->resume_work);
799 return;
800 }
801 }
802
803 fb_set_suspend(fb_helper->info, suspend);
804 console_unlock();
805}
806EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
807
808static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
809{
810 u32 *palette = (u32 *)info->pseudo_palette;
811 int i;
812
813 if (cmap->start + cmap->len > 16)
814 return -EINVAL;
815
816 for (i = 0; i < cmap->len; ++i) {
817 u16 red = cmap->red[i];
818 u16 green = cmap->green[i];
819 u16 blue = cmap->blue[i];
820 u32 value;
821
822 red >>= 16 - info->var.red.length;
823 green >>= 16 - info->var.green.length;
824 blue >>= 16 - info->var.blue.length;
825 value = (red << info->var.red.offset) |
826 (green << info->var.green.offset) |
827 (blue << info->var.blue.offset);
828 if (info->var.transp.length > 0) {
829 u32 mask = (1 << info->var.transp.length) - 1;
830
831 mask <<= info->var.transp.offset;
832 value |= mask;
833 }
834 palette[cmap->start + i] = value;
835 }
836
837 return 0;
838}
839
840static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
841{
842 struct drm_fb_helper *fb_helper = info->par;
843 struct drm_mode_set *modeset;
844 struct drm_crtc *crtc;
845 u16 *r, *g, *b;
846 int ret = 0;
847
848 drm_modeset_lock_all(fb_helper->dev);
849 drm_client_for_each_modeset(modeset, &fb_helper->client) {
850 crtc = modeset->crtc;
851 if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
852 ret = -EINVAL;
853 goto out;
854 }
855
856 if (cmap->start + cmap->len > crtc->gamma_size) {
857 ret = -EINVAL;
858 goto out;
859 }
860
861 r = crtc->gamma_store;
862 g = r + crtc->gamma_size;
863 b = g + crtc->gamma_size;
864
865 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
866 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
867 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
868
869 ret = crtc->funcs->gamma_set(crtc, r, g, b,
870 crtc->gamma_size, NULL);
871 if (ret)
872 goto out;
873 }
874out:
875 drm_modeset_unlock_all(fb_helper->dev);
876
877 return ret;
878}
879
880static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
881 struct fb_cmap *cmap)
882{
883 struct drm_device *dev = crtc->dev;
884 struct drm_property_blob *gamma_lut;
885 struct drm_color_lut *lut;
886 int size = crtc->gamma_size;
887 int i;
888
889 if (!size || cmap->start + cmap->len > size)
890 return ERR_PTR(-EINVAL);
891
892 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
893 if (IS_ERR(gamma_lut))
894 return gamma_lut;
895
896 lut = gamma_lut->data;
897 if (cmap->start || cmap->len != size) {
898 u16 *r = crtc->gamma_store;
899 u16 *g = r + crtc->gamma_size;
900 u16 *b = g + crtc->gamma_size;
901
902 for (i = 0; i < cmap->start; i++) {
903 lut[i].red = r[i];
904 lut[i].green = g[i];
905 lut[i].blue = b[i];
906 }
907 for (i = cmap->start + cmap->len; i < size; i++) {
908 lut[i].red = r[i];
909 lut[i].green = g[i];
910 lut[i].blue = b[i];
911 }
912 }
913
914 for (i = 0; i < cmap->len; i++) {
915 lut[cmap->start + i].red = cmap->red[i];
916 lut[cmap->start + i].green = cmap->green[i];
917 lut[cmap->start + i].blue = cmap->blue[i];
918 }
919
920 return gamma_lut;
921}
922
923static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
924{
925 struct drm_fb_helper *fb_helper = info->par;
926 struct drm_device *dev = fb_helper->dev;
927 struct drm_property_blob *gamma_lut = NULL;
928 struct drm_modeset_acquire_ctx ctx;
929 struct drm_crtc_state *crtc_state;
930 struct drm_atomic_state *state;
931 struct drm_mode_set *modeset;
932 struct drm_crtc *crtc;
933 u16 *r, *g, *b;
934 bool replaced;
935 int ret = 0;
936
937 drm_modeset_acquire_init(&ctx, 0);
938
939 state = drm_atomic_state_alloc(dev);
940 if (!state) {
941 ret = -ENOMEM;
942 goto out_ctx;
943 }
944
945 state->acquire_ctx = &ctx;
946retry:
947 drm_client_for_each_modeset(modeset, &fb_helper->client) {
948 crtc = modeset->crtc;
949
950 if (!gamma_lut)
951 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
952 if (IS_ERR(gamma_lut)) {
953 ret = PTR_ERR(gamma_lut);
954 gamma_lut = NULL;
955 goto out_state;
956 }
957
958 crtc_state = drm_atomic_get_crtc_state(state, crtc);
959 if (IS_ERR(crtc_state)) {
960 ret = PTR_ERR(crtc_state);
961 goto out_state;
962 }
963
964 /*
965 * FIXME: This always uses gamma_lut. Some HW have only
966 * degamma_lut, in which case we should reset gamma_lut and set
967 * degamma_lut. See drm_crtc_legacy_gamma_set().
968 */
969 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
970 NULL);
971 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
972 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
973 gamma_lut);
974 crtc_state->color_mgmt_changed |= replaced;
975 }
976
977 ret = drm_atomic_commit(state);
978 if (ret)
979 goto out_state;
980
981 drm_client_for_each_modeset(modeset, &fb_helper->client) {
982 crtc = modeset->crtc;
983
984 r = crtc->gamma_store;
985 g = r + crtc->gamma_size;
986 b = g + crtc->gamma_size;
987
988 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
989 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
990 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
991 }
992
993out_state:
994 if (ret == -EDEADLK)
995 goto backoff;
996
997 drm_property_blob_put(gamma_lut);
998 drm_atomic_state_put(state);
999out_ctx:
1000 drm_modeset_drop_locks(&ctx);
1001 drm_modeset_acquire_fini(&ctx);
1002
1003 return ret;
1004
1005backoff:
1006 drm_atomic_state_clear(state);
1007 drm_modeset_backoff(&ctx);
1008 goto retry;
1009}
1010
1011/**
1012 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1013 * @cmap: cmap to set
1014 * @info: fbdev registered by the helper
1015 */
1016int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1017{
1018 struct drm_fb_helper *fb_helper = info->par;
1019 struct drm_device *dev = fb_helper->dev;
1020 int ret;
1021
1022 if (oops_in_progress)
1023 return -EBUSY;
1024
1025 mutex_lock(&fb_helper->lock);
1026
1027 if (!drm_master_internal_acquire(dev)) {
1028 ret = -EBUSY;
1029 goto unlock;
1030 }
1031
1032 mutex_lock(&fb_helper->client.modeset_mutex);
1033 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1034 ret = setcmap_pseudo_palette(cmap, info);
1035 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1036 ret = setcmap_atomic(cmap, info);
1037 else
1038 ret = setcmap_legacy(cmap, info);
1039 mutex_unlock(&fb_helper->client.modeset_mutex);
1040
1041 drm_master_internal_release(dev);
1042unlock:
1043 mutex_unlock(&fb_helper->lock);
1044
1045 return ret;
1046}
1047EXPORT_SYMBOL(drm_fb_helper_setcmap);
1048
1049/**
1050 * drm_fb_helper_ioctl - legacy ioctl implementation
1051 * @info: fbdev registered by the helper
1052 * @cmd: ioctl command
1053 * @arg: ioctl argument
1054 *
1055 * A helper to implement the standard fbdev ioctl. Only
1056 * FBIO_WAITFORVSYNC is implemented for now.
1057 */
1058int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1059 unsigned long arg)
1060{
1061 struct drm_fb_helper *fb_helper = info->par;
1062 struct drm_device *dev = fb_helper->dev;
1063 struct drm_crtc *crtc;
1064 int ret = 0;
1065
1066 mutex_lock(&fb_helper->lock);
1067 if (!drm_master_internal_acquire(dev)) {
1068 ret = -EBUSY;
1069 goto unlock;
1070 }
1071
1072 switch (cmd) {
1073 case FBIO_WAITFORVSYNC:
1074 /*
1075 * Only consider the first CRTC.
1076 *
1077 * This ioctl is supposed to take the CRTC number as
1078 * an argument, but in fbdev times, what that number
1079 * was supposed to be was quite unclear, different
1080 * drivers were passing that argument differently
1081 * (some by reference, some by value), and most of the
1082 * userspace applications were just hardcoding 0 as an
1083 * argument.
1084 *
1085 * The first CRTC should be the integrated panel on
1086 * most drivers, so this is the best choice we can
1087 * make. If we're not smart enough here, one should
1088 * just consider switch the userspace to KMS.
1089 */
1090 crtc = fb_helper->client.modesets[0].crtc;
1091
1092 /*
1093 * Only wait for a vblank event if the CRTC is
1094 * enabled, otherwise just don't do anythintg,
1095 * not even report an error.
1096 */
1097 ret = drm_crtc_vblank_get(crtc);
1098 if (!ret) {
1099 drm_crtc_wait_one_vblank(crtc);
1100 drm_crtc_vblank_put(crtc);
1101 }
1102
1103 ret = 0;
1104 break;
1105 default:
1106 ret = -ENOTTY;
1107 }
1108
1109 drm_master_internal_release(dev);
1110unlock:
1111 mutex_unlock(&fb_helper->lock);
1112 return ret;
1113}
1114EXPORT_SYMBOL(drm_fb_helper_ioctl);
1115
1116static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1117 const struct fb_var_screeninfo *var_2)
1118{
1119 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1120 var_1->grayscale == var_2->grayscale &&
1121 var_1->red.offset == var_2->red.offset &&
1122 var_1->red.length == var_2->red.length &&
1123 var_1->red.msb_right == var_2->red.msb_right &&
1124 var_1->green.offset == var_2->green.offset &&
1125 var_1->green.length == var_2->green.length &&
1126 var_1->green.msb_right == var_2->green.msb_right &&
1127 var_1->blue.offset == var_2->blue.offset &&
1128 var_1->blue.length == var_2->blue.length &&
1129 var_1->blue.msb_right == var_2->blue.msb_right &&
1130 var_1->transp.offset == var_2->transp.offset &&
1131 var_1->transp.length == var_2->transp.length &&
1132 var_1->transp.msb_right == var_2->transp.msb_right;
1133}
1134
1135static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1136 const struct drm_format_info *format)
1137{
1138 u8 depth = format->depth;
1139
1140 if (format->is_color_indexed) {
1141 var->red.offset = 0;
1142 var->green.offset = 0;
1143 var->blue.offset = 0;
1144 var->red.length = depth;
1145 var->green.length = depth;
1146 var->blue.length = depth;
1147 var->transp.offset = 0;
1148 var->transp.length = 0;
1149 return;
1150 }
1151
1152 switch (depth) {
1153 case 15:
1154 var->red.offset = 10;
1155 var->green.offset = 5;
1156 var->blue.offset = 0;
1157 var->red.length = 5;
1158 var->green.length = 5;
1159 var->blue.length = 5;
1160 var->transp.offset = 15;
1161 var->transp.length = 1;
1162 break;
1163 case 16:
1164 var->red.offset = 11;
1165 var->green.offset = 5;
1166 var->blue.offset = 0;
1167 var->red.length = 5;
1168 var->green.length = 6;
1169 var->blue.length = 5;
1170 var->transp.offset = 0;
1171 break;
1172 case 24:
1173 var->red.offset = 16;
1174 var->green.offset = 8;
1175 var->blue.offset = 0;
1176 var->red.length = 8;
1177 var->green.length = 8;
1178 var->blue.length = 8;
1179 var->transp.offset = 0;
1180 var->transp.length = 0;
1181 break;
1182 case 32:
1183 var->red.offset = 16;
1184 var->green.offset = 8;
1185 var->blue.offset = 0;
1186 var->red.length = 8;
1187 var->green.length = 8;
1188 var->blue.length = 8;
1189 var->transp.offset = 24;
1190 var->transp.length = 8;
1191 break;
1192 default:
1193 break;
1194 }
1195}
1196
1197static void __fill_var(struct fb_var_screeninfo *var, struct fb_info *info,
1198 struct drm_framebuffer *fb)
1199{
1200 int i;
1201
1202 var->xres_virtual = fb->width;
1203 var->yres_virtual = fb->height;
1204 var->accel_flags = 0;
1205 var->bits_per_pixel = drm_format_info_bpp(fb->format, 0);
1206
1207 var->height = info->var.height;
1208 var->width = info->var.width;
1209
1210 var->left_margin = var->right_margin = 0;
1211 var->upper_margin = var->lower_margin = 0;
1212 var->hsync_len = var->vsync_len = 0;
1213 var->sync = var->vmode = 0;
1214 var->rotate = 0;
1215 var->colorspace = 0;
1216 for (i = 0; i < 4; i++)
1217 var->reserved[i] = 0;
1218}
1219
1220/**
1221 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1222 * @var: screeninfo to check
1223 * @info: fbdev registered by the helper
1224 */
1225int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1226 struct fb_info *info)
1227{
1228 struct drm_fb_helper *fb_helper = info->par;
1229 struct drm_framebuffer *fb = fb_helper->fb;
1230 const struct drm_format_info *format = fb->format;
1231 struct drm_device *dev = fb_helper->dev;
1232 unsigned int bpp;
1233
1234 if (in_dbg_master())
1235 return -EINVAL;
1236
1237 if (var->pixclock != 0) {
1238 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1239 var->pixclock = 0;
1240 }
1241
1242 switch (format->format) {
1243 case DRM_FORMAT_C1:
1244 case DRM_FORMAT_C2:
1245 case DRM_FORMAT_C4:
1246 /* supported format with sub-byte pixels */
1247 break;
1248
1249 default:
1250 if ((drm_format_info_block_width(format, 0) > 1) ||
1251 (drm_format_info_block_height(format, 0) > 1))
1252 return -EINVAL;
1253 break;
1254 }
1255
1256 /*
1257 * Changes struct fb_var_screeninfo are currently not pushed back
1258 * to KMS, hence fail if different settings are requested.
1259 */
1260 bpp = drm_format_info_bpp(format, 0);
1261 if (var->bits_per_pixel > bpp ||
1262 var->xres > fb->width || var->yres > fb->height ||
1263 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1264 drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
1265 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1266 var->xres, var->yres, var->bits_per_pixel,
1267 var->xres_virtual, var->yres_virtual,
1268 fb->width, fb->height, bpp);
1269 return -EINVAL;
1270 }
1271
1272 __fill_var(var, info, fb);
1273
1274 /*
1275 * fb_pan_display() validates this, but fb_set_par() doesn't and just
1276 * falls over. Note that __fill_var above adjusts y/res_virtual.
1277 */
1278 if (var->yoffset > var->yres_virtual - var->yres ||
1279 var->xoffset > var->xres_virtual - var->xres)
1280 return -EINVAL;
1281
1282 /* We neither support grayscale nor FOURCC (also stored in here). */
1283 if (var->grayscale > 0)
1284 return -EINVAL;
1285
1286 if (var->nonstd)
1287 return -EINVAL;
1288
1289 /*
1290 * Workaround for SDL 1.2, which is known to be setting all pixel format
1291 * fields values to zero in some cases. We treat this situation as a
1292 * kind of "use some reasonable autodetected values".
1293 */
1294 if (!var->red.offset && !var->green.offset &&
1295 !var->blue.offset && !var->transp.offset &&
1296 !var->red.length && !var->green.length &&
1297 !var->blue.length && !var->transp.length &&
1298 !var->red.msb_right && !var->green.msb_right &&
1299 !var->blue.msb_right && !var->transp.msb_right) {
1300 drm_fb_helper_fill_pixel_fmt(var, format);
1301 }
1302
1303 /*
1304 * drm fbdev emulation doesn't support changing the pixel format at all,
1305 * so reject all pixel format changing requests.
1306 */
1307 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1308 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n");
1309 return -EINVAL;
1310 }
1311
1312 return 0;
1313}
1314EXPORT_SYMBOL(drm_fb_helper_check_var);
1315
1316/**
1317 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1318 * @info: fbdev registered by the helper
1319 *
1320 * This will let fbcon do the mode init and is called at initialization time by
1321 * the fbdev core when registering the driver, and later on through the hotplug
1322 * callback.
1323 */
1324int drm_fb_helper_set_par(struct fb_info *info)
1325{
1326 struct drm_fb_helper *fb_helper = info->par;
1327 struct fb_var_screeninfo *var = &info->var;
1328 bool force;
1329
1330 if (oops_in_progress)
1331 return -EBUSY;
1332
1333 /*
1334 * Normally we want to make sure that a kms master takes precedence over
1335 * fbdev, to avoid fbdev flickering and occasionally stealing the
1336 * display status. But Xorg first sets the vt back to text mode using
1337 * the KDSET IOCTL with KD_TEXT, and only after that drops the master
1338 * status when exiting.
1339 *
1340 * In the past this was caught by drm_fb_helper_lastclose(), but on
1341 * modern systems where logind always keeps a drm fd open to orchestrate
1342 * the vt switching, this doesn't work.
1343 *
1344 * To not break the userspace ABI we have this special case here, which
1345 * is only used for the above case. Everything else uses the normal
1346 * commit function, which ensures that we never steal the display from
1347 * an active drm master.
1348 */
1349 force = var->activate & FB_ACTIVATE_KD_TEXT;
1350
1351 __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force);
1352
1353 return 0;
1354}
1355EXPORT_SYMBOL(drm_fb_helper_set_par);
1356
1357static void pan_set(struct drm_fb_helper *fb_helper, int dx, int dy)
1358{
1359 struct drm_mode_set *mode_set;
1360
1361 mutex_lock(&fb_helper->client.modeset_mutex);
1362 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1363 mode_set->x += dx;
1364 mode_set->y += dy;
1365 }
1366 mutex_unlock(&fb_helper->client.modeset_mutex);
1367}
1368
1369static int pan_display_atomic(struct fb_var_screeninfo *var,
1370 struct fb_info *info)
1371{
1372 struct drm_fb_helper *fb_helper = info->par;
1373 int ret, dx, dy;
1374
1375 dx = var->xoffset - info->var.xoffset;
1376 dy = var->yoffset - info->var.yoffset;
1377 pan_set(fb_helper, dx, dy);
1378
1379 ret = drm_client_modeset_commit_locked(&fb_helper->client);
1380 if (!ret) {
1381 info->var.xoffset = var->xoffset;
1382 info->var.yoffset = var->yoffset;
1383 } else
1384 pan_set(fb_helper, -dx, -dy);
1385
1386 return ret;
1387}
1388
1389static int pan_display_legacy(struct fb_var_screeninfo *var,
1390 struct fb_info *info)
1391{
1392 struct drm_fb_helper *fb_helper = info->par;
1393 struct drm_client_dev *client = &fb_helper->client;
1394 struct drm_mode_set *modeset;
1395 int ret = 0;
1396
1397 mutex_lock(&client->modeset_mutex);
1398 drm_modeset_lock_all(fb_helper->dev);
1399 drm_client_for_each_modeset(modeset, client) {
1400 modeset->x = var->xoffset;
1401 modeset->y = var->yoffset;
1402
1403 if (modeset->num_connectors) {
1404 ret = drm_mode_set_config_internal(modeset);
1405 if (!ret) {
1406 info->var.xoffset = var->xoffset;
1407 info->var.yoffset = var->yoffset;
1408 }
1409 }
1410 }
1411 drm_modeset_unlock_all(fb_helper->dev);
1412 mutex_unlock(&client->modeset_mutex);
1413
1414 return ret;
1415}
1416
1417/**
1418 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1419 * @var: updated screen information
1420 * @info: fbdev registered by the helper
1421 */
1422int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1423 struct fb_info *info)
1424{
1425 struct drm_fb_helper *fb_helper = info->par;
1426 struct drm_device *dev = fb_helper->dev;
1427 int ret;
1428
1429 if (oops_in_progress)
1430 return -EBUSY;
1431
1432 mutex_lock(&fb_helper->lock);
1433 if (!drm_master_internal_acquire(dev)) {
1434 ret = -EBUSY;
1435 goto unlock;
1436 }
1437
1438 if (drm_drv_uses_atomic_modeset(dev))
1439 ret = pan_display_atomic(var, info);
1440 else
1441 ret = pan_display_legacy(var, info);
1442
1443 drm_master_internal_release(dev);
1444unlock:
1445 mutex_unlock(&fb_helper->lock);
1446
1447 return ret;
1448}
1449EXPORT_SYMBOL(drm_fb_helper_pan_display);
1450
1451static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats,
1452 size_t format_count, unsigned int color_mode)
1453{
1454 struct drm_device *dev = fb_helper->dev;
1455 uint32_t format;
1456 size_t i;
1457
1458 format = drm_driver_color_mode_format(dev, color_mode);
1459 if (!format) {
1460 drm_info(dev, "unsupported color mode of %d\n", color_mode);
1461 return DRM_FORMAT_INVALID;
1462 }
1463
1464 for (i = 0; i < format_count; ++i) {
1465 if (formats[i] == format)
1466 return format;
1467 }
1468 drm_warn(dev, "format %p4cc not supported\n", &format);
1469
1470 return DRM_FORMAT_INVALID;
1471}
1472
1473static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
1474 struct drm_fb_helper_surface_size *sizes)
1475{
1476 struct drm_client_dev *client = &fb_helper->client;
1477 struct drm_device *dev = fb_helper->dev;
1478 int crtc_count = 0;
1479 struct drm_connector_list_iter conn_iter;
1480 struct drm_connector *connector;
1481 struct drm_mode_set *mode_set;
1482 uint32_t surface_format = DRM_FORMAT_INVALID;
1483 const struct drm_format_info *info;
1484
1485 memset(sizes, 0, sizeof(*sizes));
1486 sizes->fb_width = (u32)-1;
1487 sizes->fb_height = (u32)-1;
1488
1489 drm_client_for_each_modeset(mode_set, client) {
1490 struct drm_crtc *crtc = mode_set->crtc;
1491 struct drm_plane *plane = crtc->primary;
1492
1493 drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
1494
1495 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1496 drm_client_for_each_connector_iter(connector, &conn_iter) {
1497 struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
1498
1499 if (!cmdline_mode->bpp_specified)
1500 continue;
1501
1502 surface_format = drm_fb_helper_find_format(fb_helper,
1503 plane->format_types,
1504 plane->format_count,
1505 cmdline_mode->bpp);
1506 if (surface_format != DRM_FORMAT_INVALID)
1507 break; /* found supported format */
1508 }
1509 drm_connector_list_iter_end(&conn_iter);
1510
1511 if (surface_format != DRM_FORMAT_INVALID)
1512 break; /* found supported format */
1513
1514 /* try preferred color mode */
1515 surface_format = drm_fb_helper_find_format(fb_helper,
1516 plane->format_types,
1517 plane->format_count,
1518 fb_helper->preferred_bpp);
1519 if (surface_format != DRM_FORMAT_INVALID)
1520 break; /* found supported format */
1521 }
1522
1523 if (surface_format == DRM_FORMAT_INVALID) {
1524 /*
1525 * If none of the given color modes works, fall back
1526 * to XRGB8888. Drivers are expected to provide this
1527 * format for compatibility with legacy applications.
1528 */
1529 drm_warn(dev, "No compatible format found\n");
1530 surface_format = drm_driver_legacy_fb_format(dev, 32, 24);
1531 }
1532
1533 info = drm_format_info(surface_format);
1534 sizes->surface_bpp = drm_format_info_bpp(info, 0);
1535 sizes->surface_depth = info->depth;
1536
1537 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1538 crtc_count = 0;
1539 drm_client_for_each_modeset(mode_set, client) {
1540 struct drm_display_mode *desired_mode;
1541 int x, y, j;
1542 /* in case of tile group, are we the last tile vert or horiz?
1543 * If no tile group you are always the last one both vertically
1544 * and horizontally
1545 */
1546 bool lastv = true, lasth = true;
1547
1548 desired_mode = mode_set->mode;
1549
1550 if (!desired_mode)
1551 continue;
1552
1553 crtc_count++;
1554
1555 x = mode_set->x;
1556 y = mode_set->y;
1557
1558 sizes->surface_width =
1559 max_t(u32, desired_mode->hdisplay + x, sizes->surface_width);
1560 sizes->surface_height =
1561 max_t(u32, desired_mode->vdisplay + y, sizes->surface_height);
1562
1563 for (j = 0; j < mode_set->num_connectors; j++) {
1564 struct drm_connector *connector = mode_set->connectors[j];
1565
1566 if (connector->has_tile &&
1567 desired_mode->hdisplay == connector->tile_h_size &&
1568 desired_mode->vdisplay == connector->tile_v_size) {
1569 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1570 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1571 /* cloning to multiple tiles is just crazy-talk, so: */
1572 break;
1573 }
1574 }
1575
1576 if (lasth)
1577 sizes->fb_width = min_t(u32, desired_mode->hdisplay + x, sizes->fb_width);
1578 if (lastv)
1579 sizes->fb_height = min_t(u32, desired_mode->vdisplay + y, sizes->fb_height);
1580 }
1581
1582 if (crtc_count == 0 || sizes->fb_width == -1 || sizes->fb_height == -1) {
1583 drm_info(dev, "Cannot find any crtc or sizes\n");
1584 return -EAGAIN;
1585 }
1586
1587 return 0;
1588}
1589
1590static int drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper,
1591 struct drm_fb_helper_surface_size *sizes)
1592{
1593 struct drm_client_dev *client = &fb_helper->client;
1594 struct drm_device *dev = fb_helper->dev;
1595 struct drm_mode_config *config = &dev->mode_config;
1596 int ret;
1597
1598 mutex_lock(&client->modeset_mutex);
1599 ret = __drm_fb_helper_find_sizes(fb_helper, sizes);
1600 mutex_unlock(&client->modeset_mutex);
1601
1602 if (ret)
1603 return ret;
1604
1605 /* Handle our overallocation */
1606 sizes->surface_height *= drm_fbdev_overalloc;
1607 sizes->surface_height /= 100;
1608 if (sizes->surface_height > config->max_height) {
1609 drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
1610 config->max_height);
1611 sizes->surface_height = config->max_height;
1612 }
1613
1614 return 0;
1615}
1616
1617/*
1618 * Allocates the backing storage and sets up the fbdev info structure through
1619 * the ->fbdev_probe callback.
1620 */
1621static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
1622{
1623 struct drm_client_dev *client = &fb_helper->client;
1624 struct drm_device *dev = fb_helper->dev;
1625 struct drm_fb_helper_surface_size sizes;
1626 struct fb_info *info;
1627 int ret;
1628
1629 ret = drm_fb_helper_find_sizes(fb_helper, &sizes);
1630 if (ret) {
1631 /* First time: disable all crtc's.. */
1632 if (!fb_helper->deferred_setup)
1633 drm_client_modeset_commit(client);
1634 return ret;
1635 }
1636
1637 /* push down into drivers */
1638 if (dev->driver->fbdev_probe)
1639 ret = dev->driver->fbdev_probe(fb_helper, &sizes);
1640 else if (fb_helper->funcs)
1641 ret = fb_helper->funcs->fb_probe(fb_helper, &sizes);
1642 if (ret < 0)
1643 return ret;
1644
1645 strcpy(fb_helper->fb->comm, "[fbcon]");
1646
1647 info = fb_helper->info;
1648
1649 /* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
1650 if (dev_is_pci(info->device))
1651 vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
1652
1653 return 0;
1654}
1655
1656static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1657 bool is_color_indexed)
1658{
1659 info->fix.type = FB_TYPE_PACKED_PIXELS;
1660 info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
1661 : FB_VISUAL_TRUECOLOR;
1662 info->fix.mmio_start = 0;
1663 info->fix.mmio_len = 0;
1664 info->fix.type_aux = 0;
1665 info->fix.xpanstep = 1; /* doing it in hw */
1666 info->fix.ypanstep = 1; /* doing it in hw */
1667 info->fix.ywrapstep = 0;
1668 info->fix.accel = FB_ACCEL_NONE;
1669
1670 info->fix.line_length = pitch;
1671}
1672
1673static void drm_fb_helper_fill_var(struct fb_info *info,
1674 struct drm_fb_helper *fb_helper,
1675 uint32_t fb_width, uint32_t fb_height)
1676{
1677 struct drm_framebuffer *fb = fb_helper->fb;
1678 const struct drm_format_info *format = fb->format;
1679
1680 switch (format->format) {
1681 case DRM_FORMAT_C1:
1682 case DRM_FORMAT_C2:
1683 case DRM_FORMAT_C4:
1684 /* supported format with sub-byte pixels */
1685 break;
1686
1687 default:
1688 WARN_ON((drm_format_info_block_width(format, 0) > 1) ||
1689 (drm_format_info_block_height(format, 0) > 1));
1690 break;
1691 }
1692
1693 info->pseudo_palette = fb_helper->pseudo_palette;
1694 info->var.xoffset = 0;
1695 info->var.yoffset = 0;
1696 __fill_var(&info->var, info, fb);
1697 info->var.activate = FB_ACTIVATE_NOW;
1698
1699 drm_fb_helper_fill_pixel_fmt(&info->var, format);
1700
1701 info->var.xres = fb_width;
1702 info->var.yres = fb_height;
1703}
1704
1705/**
1706 * drm_fb_helper_fill_info - initializes fbdev information
1707 * @info: fbdev instance to set up
1708 * @fb_helper: fb helper instance to use as template
1709 * @sizes: describes fbdev size and scanout surface size
1710 *
1711 * Sets up the variable and fixed fbdev metainformation from the given fb helper
1712 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
1713 *
1714 * Drivers should call this (or their equivalent setup code) from their
1715 * &drm_driver.fbdev_probe callback after having allocated the fbdev
1716 * backing storage framebuffer.
1717 */
1718void drm_fb_helper_fill_info(struct fb_info *info,
1719 struct drm_fb_helper *fb_helper,
1720 struct drm_fb_helper_surface_size *sizes)
1721{
1722 struct drm_framebuffer *fb = fb_helper->fb;
1723
1724 drm_fb_helper_fill_fix(info, fb->pitches[0],
1725 fb->format->is_color_indexed);
1726 drm_fb_helper_fill_var(info, fb_helper,
1727 sizes->fb_width, sizes->fb_height);
1728
1729 info->par = fb_helper;
1730 /*
1731 * The DRM drivers fbdev emulation device name can be confusing if the
1732 * driver name also has a "drm" suffix on it. Leading to names such as
1733 * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't
1734 * be changed due user-space tools (e.g: pm-utils) matching against it.
1735 */
1736 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
1737 fb_helper->dev->driver->name);
1738
1739}
1740EXPORT_SYMBOL(drm_fb_helper_fill_info);
1741
1742/*
1743 * This is a continuation of drm_setup_crtcs() that sets up anything related
1744 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
1745 * the framebuffer has been allocated (fb_helper->fb and fb_helper->info).
1746 * So, any setup that touches those fields needs to be done here instead of in
1747 * drm_setup_crtcs().
1748 */
1749static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
1750{
1751 struct drm_client_dev *client = &fb_helper->client;
1752 struct drm_connector_list_iter conn_iter;
1753 struct fb_info *info = fb_helper->info;
1754 unsigned int rotation, sw_rotations = 0;
1755 struct drm_connector *connector;
1756 struct drm_mode_set *modeset;
1757
1758 mutex_lock(&client->modeset_mutex);
1759 drm_client_for_each_modeset(modeset, client) {
1760 if (!modeset->num_connectors)
1761 continue;
1762
1763 modeset->fb = fb_helper->fb;
1764
1765 if (drm_client_rotation(modeset, &rotation))
1766 /* Rotating in hardware, fbcon should not rotate */
1767 sw_rotations |= DRM_MODE_ROTATE_0;
1768 else
1769 sw_rotations |= rotation;
1770 }
1771 mutex_unlock(&client->modeset_mutex);
1772
1773 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1774 drm_client_for_each_connector_iter(connector, &conn_iter) {
1775
1776 /* use first connected connector for the physical dimensions */
1777 if (connector->status == connector_status_connected) {
1778 info->var.width = connector->display_info.width_mm;
1779 info->var.height = connector->display_info.height_mm;
1780 break;
1781 }
1782 }
1783 drm_connector_list_iter_end(&conn_iter);
1784
1785 switch (sw_rotations) {
1786 case DRM_MODE_ROTATE_0:
1787 info->fbcon_rotate_hint = FB_ROTATE_UR;
1788 break;
1789 case DRM_MODE_ROTATE_90:
1790 info->fbcon_rotate_hint = FB_ROTATE_CCW;
1791 break;
1792 case DRM_MODE_ROTATE_180:
1793 info->fbcon_rotate_hint = FB_ROTATE_UD;
1794 break;
1795 case DRM_MODE_ROTATE_270:
1796 info->fbcon_rotate_hint = FB_ROTATE_CW;
1797 break;
1798 default:
1799 /*
1800 * Multiple bits are set / multiple rotations requested
1801 * fbcon cannot handle separate rotation settings per
1802 * output, so fallback to unrotated.
1803 */
1804 info->fbcon_rotate_hint = FB_ROTATE_UR;
1805 }
1806}
1807
1808/* Note: Drops fb_helper->lock before returning. */
1809static int
1810__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
1811{
1812 struct drm_device *dev = fb_helper->dev;
1813 struct fb_info *info;
1814 unsigned int width, height;
1815 int ret;
1816
1817 width = dev->mode_config.max_width;
1818 height = dev->mode_config.max_height;
1819
1820 drm_client_modeset_probe(&fb_helper->client, width, height);
1821 ret = drm_fb_helper_single_fb_probe(fb_helper);
1822 if (ret < 0) {
1823 if (ret == -EAGAIN) {
1824 fb_helper->deferred_setup = true;
1825 ret = 0;
1826 }
1827 mutex_unlock(&fb_helper->lock);
1828
1829 return ret;
1830 }
1831 drm_setup_crtcs_fb(fb_helper);
1832
1833 fb_helper->deferred_setup = false;
1834
1835 info = fb_helper->info;
1836 info->var.pixclock = 0;
1837
1838 /* Need to drop locks to avoid recursive deadlock in
1839 * register_framebuffer. This is ok because the only thing left to do is
1840 * register the fbdev emulation instance in kernel_fb_helper_list. */
1841 mutex_unlock(&fb_helper->lock);
1842
1843 ret = register_framebuffer(info);
1844 if (ret < 0)
1845 return ret;
1846
1847 drm_info(dev, "fb%d: %s frame buffer device\n",
1848 info->node, info->fix.id);
1849
1850 mutex_lock(&kernel_fb_helper_lock);
1851 if (list_empty(&kernel_fb_helper_list))
1852 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1853
1854 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1855 mutex_unlock(&kernel_fb_helper_lock);
1856
1857 return 0;
1858}
1859
1860/**
1861 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1862 * @fb_helper: fb_helper device struct
1863 *
1864 * Scans the CRTCs and connectors and tries to put together an initial setup.
1865 * At the moment, this is a cloned configuration across all heads with
1866 * a new framebuffer object as the backing store.
1867 *
1868 * Note that this also registers the fbdev and so allows userspace to call into
1869 * the driver through the fbdev interfaces.
1870 *
1871 * This function will call down into the &drm_driver.fbdev_probe callback
1872 * to let the driver allocate and initialize the fbdev info structure and the
1873 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
1874 * as a helper to setup simple default values for the fbdev info structure.
1875 *
1876 * HANG DEBUGGING:
1877 *
1878 * When you have fbcon support built-in or already loaded, this function will do
1879 * a full modeset to setup the fbdev console. Due to locking misdesign in the
1880 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
1881 * console_lock. Until console_unlock is called no dmesg lines will be sent out
1882 * to consoles, not even serial console. This means when your driver crashes,
1883 * you will see absolutely nothing else but a system stuck in this function,
1884 * with no further output. Any kind of printk() you place within your own driver
1885 * or in the drm core modeset code will also never show up.
1886 *
1887 * Standard debug practice is to run the fbcon setup without taking the
1888 * console_lock as a hack, to be able to see backtraces and crashes on the
1889 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
1890 * cmdline option.
1891 *
1892 * The other option is to just disable fbdev emulation since very likely the
1893 * first modeset from userspace will crash in the same way, and is even easier
1894 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
1895 * kernel cmdline option.
1896 *
1897 * RETURNS:
1898 * Zero if everything went ok, nonzero otherwise.
1899 */
1900int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper)
1901{
1902 int ret;
1903
1904 if (!drm_fbdev_emulation)
1905 return 0;
1906
1907 mutex_lock(&fb_helper->lock);
1908 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper);
1909
1910 return ret;
1911}
1912EXPORT_SYMBOL(drm_fb_helper_initial_config);
1913
1914/**
1915 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1916 * probing all the outputs attached to the fb
1917 * @fb_helper: driver-allocated fbdev helper, can be NULL
1918 *
1919 * Scan the connectors attached to the fb_helper and try to put together a
1920 * setup after notification of a change in output configuration.
1921 *
1922 * Called at runtime, takes the mode config locks to be able to check/change the
1923 * modeset configuration. Must be run from process context (which usually means
1924 * either the output polling work or a work item launched from the driver's
1925 * hotplug interrupt).
1926 *
1927 * Note that drivers may call this even before calling
1928 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
1929 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1930 * not miss any hotplug events.
1931 *
1932 * RETURNS:
1933 * 0 on success and a non-zero error code otherwise.
1934 */
1935int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1936{
1937 int err = 0;
1938
1939 if (!drm_fbdev_emulation || !fb_helper)
1940 return 0;
1941
1942 mutex_lock(&fb_helper->lock);
1943 if (fb_helper->deferred_setup) {
1944 err = __drm_fb_helper_initial_config_and_unlock(fb_helper);
1945 return err;
1946 }
1947
1948 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
1949 fb_helper->delayed_hotplug = true;
1950 mutex_unlock(&fb_helper->lock);
1951 return err;
1952 }
1953
1954 drm_master_internal_release(fb_helper->dev);
1955
1956 drm_dbg_kms(fb_helper->dev, "\n");
1957
1958 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
1959 drm_setup_crtcs_fb(fb_helper);
1960 mutex_unlock(&fb_helper->lock);
1961
1962 drm_fb_helper_set_par(fb_helper->info);
1963
1964 return 0;
1965}
1966EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1967
1968/**
1969 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
1970 * @dev: DRM device
1971 *
1972 * This function is obsolete. Call drm_fb_helper_restore_fbdev_mode_unlocked()
1973 * instead.
1974 */
1975void drm_fb_helper_lastclose(struct drm_device *dev)
1976{
1977 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
1978}
1979EXPORT_SYMBOL(drm_fb_helper_lastclose);
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#include <linux/kernel.h>
31#include <linux/sysrq.h>
32#include <linux/slab.h>
33#include <linux/fb.h>
34#include "drmP.h"
35#include "drm_crtc.h"
36#include "drm_fb_helper.h"
37#include "drm_crtc_helper.h"
38
39MODULE_AUTHOR("David Airlie, Jesse Barnes");
40MODULE_DESCRIPTION("DRM KMS helper");
41MODULE_LICENSE("GPL and additional rights");
42
43static LIST_HEAD(kernel_fb_helper_list);
44
45/* simple single crtc case helper function */
46int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
47{
48 struct drm_device *dev = fb_helper->dev;
49 struct drm_connector *connector;
50 int i;
51
52 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
53 struct drm_fb_helper_connector *fb_helper_connector;
54
55 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
56 if (!fb_helper_connector)
57 goto fail;
58
59 fb_helper_connector->connector = connector;
60 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
61 }
62 return 0;
63fail:
64 for (i = 0; i < fb_helper->connector_count; i++) {
65 kfree(fb_helper->connector_info[i]);
66 fb_helper->connector_info[i] = NULL;
67 }
68 fb_helper->connector_count = 0;
69 return -ENOMEM;
70}
71EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
72
73static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
74{
75 struct drm_fb_helper_connector *fb_helper_conn;
76 int i;
77
78 for (i = 0; i < fb_helper->connector_count; i++) {
79 struct drm_cmdline_mode *mode;
80 struct drm_connector *connector;
81 char *option = NULL;
82
83 fb_helper_conn = fb_helper->connector_info[i];
84 connector = fb_helper_conn->connector;
85 mode = &fb_helper_conn->cmdline_mode;
86
87 /* do something on return - turn off connector maybe */
88 if (fb_get_options(drm_get_connector_name(connector), &option))
89 continue;
90
91 if (drm_mode_parse_command_line_for_connector(option,
92 connector,
93 mode)) {
94 if (mode->force) {
95 const char *s;
96 switch (mode->force) {
97 case DRM_FORCE_OFF: s = "OFF"; break;
98 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
99 default:
100 case DRM_FORCE_ON: s = "ON"; break;
101 }
102
103 DRM_INFO("forcing %s connector %s\n",
104 drm_get_connector_name(connector), s);
105 connector->force = mode->force;
106 }
107
108 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
109 drm_get_connector_name(connector),
110 mode->xres, mode->yres,
111 mode->refresh_specified ? mode->refresh : 60,
112 mode->rb ? " reduced blanking" : "",
113 mode->margins ? " with margins" : "",
114 mode->interlace ? " interlaced" : "");
115 }
116
117 }
118 return 0;
119}
120
121static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
122{
123 uint16_t *r_base, *g_base, *b_base;
124 int i;
125
126 r_base = crtc->gamma_store;
127 g_base = r_base + crtc->gamma_size;
128 b_base = g_base + crtc->gamma_size;
129
130 for (i = 0; i < crtc->gamma_size; i++)
131 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
132}
133
134static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
135{
136 uint16_t *r_base, *g_base, *b_base;
137
138 r_base = crtc->gamma_store;
139 g_base = r_base + crtc->gamma_size;
140 b_base = g_base + crtc->gamma_size;
141
142 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
143}
144
145int drm_fb_helper_debug_enter(struct fb_info *info)
146{
147 struct drm_fb_helper *helper = info->par;
148 struct drm_crtc_helper_funcs *funcs;
149 int i;
150
151 if (list_empty(&kernel_fb_helper_list))
152 return false;
153
154 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
155 for (i = 0; i < helper->crtc_count; i++) {
156 struct drm_mode_set *mode_set =
157 &helper->crtc_info[i].mode_set;
158
159 if (!mode_set->crtc->enabled)
160 continue;
161
162 funcs = mode_set->crtc->helper_private;
163 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
164 funcs->mode_set_base_atomic(mode_set->crtc,
165 mode_set->fb,
166 mode_set->x,
167 mode_set->y,
168 ENTER_ATOMIC_MODE_SET);
169 }
170 }
171
172 return 0;
173}
174EXPORT_SYMBOL(drm_fb_helper_debug_enter);
175
176/* Find the real fb for a given fb helper CRTC */
177static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
178{
179 struct drm_device *dev = crtc->dev;
180 struct drm_crtc *c;
181
182 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
183 if (crtc->base.id == c->base.id)
184 return c->fb;
185 }
186
187 return NULL;
188}
189
190int drm_fb_helper_debug_leave(struct fb_info *info)
191{
192 struct drm_fb_helper *helper = info->par;
193 struct drm_crtc *crtc;
194 struct drm_crtc_helper_funcs *funcs;
195 struct drm_framebuffer *fb;
196 int i;
197
198 for (i = 0; i < helper->crtc_count; i++) {
199 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
200 crtc = mode_set->crtc;
201 funcs = crtc->helper_private;
202 fb = drm_mode_config_fb(crtc);
203
204 if (!crtc->enabled)
205 continue;
206
207 if (!fb) {
208 DRM_ERROR("no fb to restore??\n");
209 continue;
210 }
211
212 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
213 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
214 crtc->y, LEAVE_ATOMIC_MODE_SET);
215 }
216
217 return 0;
218}
219EXPORT_SYMBOL(drm_fb_helper_debug_leave);
220
221bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
222{
223 bool error = false;
224 int i, ret;
225 for (i = 0; i < fb_helper->crtc_count; i++) {
226 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
227 ret = drm_crtc_helper_set_config(mode_set);
228 if (ret)
229 error = true;
230 }
231 return error;
232}
233EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
234
235bool drm_fb_helper_force_kernel_mode(void)
236{
237 bool ret, error = false;
238 struct drm_fb_helper *helper;
239
240 if (list_empty(&kernel_fb_helper_list))
241 return false;
242
243 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
244 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
245 continue;
246
247 ret = drm_fb_helper_restore_fbdev_mode(helper);
248 if (ret)
249 error = true;
250 }
251 return error;
252}
253
254int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
255 void *panic_str)
256{
257 printk(KERN_ERR "panic occurred, switching back to text console\n");
258 return drm_fb_helper_force_kernel_mode();
259}
260EXPORT_SYMBOL(drm_fb_helper_panic);
261
262static struct notifier_block paniced = {
263 .notifier_call = drm_fb_helper_panic,
264};
265
266/**
267 * drm_fb_helper_restore - restore the framebuffer console (kernel) config
268 *
269 * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
270 */
271void drm_fb_helper_restore(void)
272{
273 bool ret;
274 ret = drm_fb_helper_force_kernel_mode();
275 if (ret == true)
276 DRM_ERROR("Failed to restore crtc configuration\n");
277}
278EXPORT_SYMBOL(drm_fb_helper_restore);
279
280#ifdef CONFIG_MAGIC_SYSRQ
281static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
282{
283 drm_fb_helper_restore();
284}
285static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
286
287static void drm_fb_helper_sysrq(int dummy1)
288{
289 schedule_work(&drm_fb_helper_restore_work);
290}
291
292static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
293 .handler = drm_fb_helper_sysrq,
294 .help_msg = "force-fb(V)",
295 .action_msg = "Restore framebuffer console",
296};
297#else
298static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
299#endif
300
301static void drm_fb_helper_on(struct fb_info *info)
302{
303 struct drm_fb_helper *fb_helper = info->par;
304 struct drm_device *dev = fb_helper->dev;
305 struct drm_crtc *crtc;
306 struct drm_crtc_helper_funcs *crtc_funcs;
307 struct drm_connector *connector;
308 struct drm_encoder *encoder;
309 int i, j;
310
311 /*
312 * For each CRTC in this fb, turn the crtc on then,
313 * find all associated encoders and turn them on.
314 */
315 mutex_lock(&dev->mode_config.mutex);
316 for (i = 0; i < fb_helper->crtc_count; i++) {
317 crtc = fb_helper->crtc_info[i].mode_set.crtc;
318 crtc_funcs = crtc->helper_private;
319
320 if (!crtc->enabled)
321 continue;
322
323 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
324
325 /* Walk the connectors & encoders on this fb turning them on */
326 for (j = 0; j < fb_helper->connector_count; j++) {
327 connector = fb_helper->connector_info[j]->connector;
328 connector->dpms = DRM_MODE_DPMS_ON;
329 drm_connector_property_set_value(connector,
330 dev->mode_config.dpms_property,
331 DRM_MODE_DPMS_ON);
332 }
333 /* Found a CRTC on this fb, now find encoders */
334 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
335 if (encoder->crtc == crtc) {
336 struct drm_encoder_helper_funcs *encoder_funcs;
337
338 encoder_funcs = encoder->helper_private;
339 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
340 }
341 }
342 }
343 mutex_unlock(&dev->mode_config.mutex);
344}
345
346static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
347{
348 struct drm_fb_helper *fb_helper = info->par;
349 struct drm_device *dev = fb_helper->dev;
350 struct drm_crtc *crtc;
351 struct drm_crtc_helper_funcs *crtc_funcs;
352 struct drm_connector *connector;
353 struct drm_encoder *encoder;
354 int i, j;
355
356 /*
357 * For each CRTC in this fb, find all associated encoders
358 * and turn them off, then turn off the CRTC.
359 */
360 mutex_lock(&dev->mode_config.mutex);
361 for (i = 0; i < fb_helper->crtc_count; i++) {
362 crtc = fb_helper->crtc_info[i].mode_set.crtc;
363 crtc_funcs = crtc->helper_private;
364
365 if (!crtc->enabled)
366 continue;
367
368 /* Walk the connectors on this fb and mark them off */
369 for (j = 0; j < fb_helper->connector_count; j++) {
370 connector = fb_helper->connector_info[j]->connector;
371 connector->dpms = dpms_mode;
372 drm_connector_property_set_value(connector,
373 dev->mode_config.dpms_property,
374 dpms_mode);
375 }
376 /* Found a CRTC on this fb, now find encoders */
377 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
378 if (encoder->crtc == crtc) {
379 struct drm_encoder_helper_funcs *encoder_funcs;
380
381 encoder_funcs = encoder->helper_private;
382 encoder_funcs->dpms(encoder, dpms_mode);
383 }
384 }
385 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
386 }
387 mutex_unlock(&dev->mode_config.mutex);
388}
389
390int drm_fb_helper_blank(int blank, struct fb_info *info)
391{
392 switch (blank) {
393 /* Display: On; HSync: On, VSync: On */
394 case FB_BLANK_UNBLANK:
395 drm_fb_helper_on(info);
396 break;
397 /* Display: Off; HSync: On, VSync: On */
398 case FB_BLANK_NORMAL:
399 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
400 break;
401 /* Display: Off; HSync: Off, VSync: On */
402 case FB_BLANK_HSYNC_SUSPEND:
403 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
404 break;
405 /* Display: Off; HSync: On, VSync: Off */
406 case FB_BLANK_VSYNC_SUSPEND:
407 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
408 break;
409 /* Display: Off; HSync: Off, VSync: Off */
410 case FB_BLANK_POWERDOWN:
411 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
412 break;
413 }
414 return 0;
415}
416EXPORT_SYMBOL(drm_fb_helper_blank);
417
418static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
419{
420 int i;
421
422 for (i = 0; i < helper->connector_count; i++)
423 kfree(helper->connector_info[i]);
424 kfree(helper->connector_info);
425 for (i = 0; i < helper->crtc_count; i++)
426 kfree(helper->crtc_info[i].mode_set.connectors);
427 kfree(helper->crtc_info);
428}
429
430int drm_fb_helper_init(struct drm_device *dev,
431 struct drm_fb_helper *fb_helper,
432 int crtc_count, int max_conn_count)
433{
434 struct drm_crtc *crtc;
435 int ret = 0;
436 int i;
437
438 fb_helper->dev = dev;
439
440 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
441
442 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
443 if (!fb_helper->crtc_info)
444 return -ENOMEM;
445
446 fb_helper->crtc_count = crtc_count;
447 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
448 if (!fb_helper->connector_info) {
449 kfree(fb_helper->crtc_info);
450 return -ENOMEM;
451 }
452 fb_helper->connector_count = 0;
453
454 for (i = 0; i < crtc_count; i++) {
455 fb_helper->crtc_info[i].mode_set.connectors =
456 kcalloc(max_conn_count,
457 sizeof(struct drm_connector *),
458 GFP_KERNEL);
459
460 if (!fb_helper->crtc_info[i].mode_set.connectors) {
461 ret = -ENOMEM;
462 goto out_free;
463 }
464 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
465 }
466
467 i = 0;
468 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
469 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
470 fb_helper->crtc_info[i].mode_set.crtc = crtc;
471 i++;
472 }
473 fb_helper->conn_limit = max_conn_count;
474 return 0;
475out_free:
476 drm_fb_helper_crtc_free(fb_helper);
477 return -ENOMEM;
478}
479EXPORT_SYMBOL(drm_fb_helper_init);
480
481void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
482{
483 if (!list_empty(&fb_helper->kernel_fb_list)) {
484 list_del(&fb_helper->kernel_fb_list);
485 if (list_empty(&kernel_fb_helper_list)) {
486 printk(KERN_INFO "drm: unregistered panic notifier\n");
487 atomic_notifier_chain_unregister(&panic_notifier_list,
488 &paniced);
489 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
490 }
491 }
492
493 drm_fb_helper_crtc_free(fb_helper);
494
495}
496EXPORT_SYMBOL(drm_fb_helper_fini);
497
498static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
499 u16 blue, u16 regno, struct fb_info *info)
500{
501 struct drm_fb_helper *fb_helper = info->par;
502 struct drm_framebuffer *fb = fb_helper->fb;
503 int pindex;
504
505 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
506 u32 *palette;
507 u32 value;
508 /* place color in psuedopalette */
509 if (regno > 16)
510 return -EINVAL;
511 palette = (u32 *)info->pseudo_palette;
512 red >>= (16 - info->var.red.length);
513 green >>= (16 - info->var.green.length);
514 blue >>= (16 - info->var.blue.length);
515 value = (red << info->var.red.offset) |
516 (green << info->var.green.offset) |
517 (blue << info->var.blue.offset);
518 if (info->var.transp.length > 0) {
519 u32 mask = (1 << info->var.transp.length) - 1;
520 mask <<= info->var.transp.offset;
521 value |= mask;
522 }
523 palette[regno] = value;
524 return 0;
525 }
526
527 pindex = regno;
528
529 if (fb->bits_per_pixel == 16) {
530 pindex = regno << 3;
531
532 if (fb->depth == 16 && regno > 63)
533 return -EINVAL;
534 if (fb->depth == 15 && regno > 31)
535 return -EINVAL;
536
537 if (fb->depth == 16) {
538 u16 r, g, b;
539 int i;
540 if (regno < 32) {
541 for (i = 0; i < 8; i++)
542 fb_helper->funcs->gamma_set(crtc, red,
543 green, blue, pindex + i);
544 }
545
546 fb_helper->funcs->gamma_get(crtc, &r,
547 &g, &b,
548 pindex >> 1);
549
550 for (i = 0; i < 4; i++)
551 fb_helper->funcs->gamma_set(crtc, r,
552 green, b,
553 (pindex >> 1) + i);
554 }
555 }
556
557 if (fb->depth != 16)
558 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
559 return 0;
560}
561
562int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
563{
564 struct drm_fb_helper *fb_helper = info->par;
565 struct drm_crtc_helper_funcs *crtc_funcs;
566 u16 *red, *green, *blue, *transp;
567 struct drm_crtc *crtc;
568 int i, j, rc = 0;
569 int start;
570
571 for (i = 0; i < fb_helper->crtc_count; i++) {
572 crtc = fb_helper->crtc_info[i].mode_set.crtc;
573 crtc_funcs = crtc->helper_private;
574
575 red = cmap->red;
576 green = cmap->green;
577 blue = cmap->blue;
578 transp = cmap->transp;
579 start = cmap->start;
580
581 for (j = 0; j < cmap->len; j++) {
582 u16 hred, hgreen, hblue, htransp = 0xffff;
583
584 hred = *red++;
585 hgreen = *green++;
586 hblue = *blue++;
587
588 if (transp)
589 htransp = *transp++;
590
591 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
592 if (rc)
593 return rc;
594 }
595 crtc_funcs->load_lut(crtc);
596 }
597 return rc;
598}
599EXPORT_SYMBOL(drm_fb_helper_setcmap);
600
601int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
602 struct fb_info *info)
603{
604 struct drm_fb_helper *fb_helper = info->par;
605 struct drm_framebuffer *fb = fb_helper->fb;
606 int depth;
607
608 if (var->pixclock != 0 || in_dbg_master())
609 return -EINVAL;
610
611 /* Need to resize the fb object !!! */
612 if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
613 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
614 "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
615 fb->width, fb->height, fb->bits_per_pixel);
616 return -EINVAL;
617 }
618
619 switch (var->bits_per_pixel) {
620 case 16:
621 depth = (var->green.length == 6) ? 16 : 15;
622 break;
623 case 32:
624 depth = (var->transp.length > 0) ? 32 : 24;
625 break;
626 default:
627 depth = var->bits_per_pixel;
628 break;
629 }
630
631 switch (depth) {
632 case 8:
633 var->red.offset = 0;
634 var->green.offset = 0;
635 var->blue.offset = 0;
636 var->red.length = 8;
637 var->green.length = 8;
638 var->blue.length = 8;
639 var->transp.length = 0;
640 var->transp.offset = 0;
641 break;
642 case 15:
643 var->red.offset = 10;
644 var->green.offset = 5;
645 var->blue.offset = 0;
646 var->red.length = 5;
647 var->green.length = 5;
648 var->blue.length = 5;
649 var->transp.length = 1;
650 var->transp.offset = 15;
651 break;
652 case 16:
653 var->red.offset = 11;
654 var->green.offset = 5;
655 var->blue.offset = 0;
656 var->red.length = 5;
657 var->green.length = 6;
658 var->blue.length = 5;
659 var->transp.length = 0;
660 var->transp.offset = 0;
661 break;
662 case 24:
663 var->red.offset = 16;
664 var->green.offset = 8;
665 var->blue.offset = 0;
666 var->red.length = 8;
667 var->green.length = 8;
668 var->blue.length = 8;
669 var->transp.length = 0;
670 var->transp.offset = 0;
671 break;
672 case 32:
673 var->red.offset = 16;
674 var->green.offset = 8;
675 var->blue.offset = 0;
676 var->red.length = 8;
677 var->green.length = 8;
678 var->blue.length = 8;
679 var->transp.length = 8;
680 var->transp.offset = 24;
681 break;
682 default:
683 return -EINVAL;
684 }
685 return 0;
686}
687EXPORT_SYMBOL(drm_fb_helper_check_var);
688
689/* this will let fbcon do the mode init */
690int drm_fb_helper_set_par(struct fb_info *info)
691{
692 struct drm_fb_helper *fb_helper = info->par;
693 struct drm_device *dev = fb_helper->dev;
694 struct fb_var_screeninfo *var = &info->var;
695 struct drm_crtc *crtc;
696 int ret;
697 int i;
698
699 if (var->pixclock != 0) {
700 DRM_ERROR("PIXEL CLOCK SET\n");
701 return -EINVAL;
702 }
703
704 mutex_lock(&dev->mode_config.mutex);
705 for (i = 0; i < fb_helper->crtc_count; i++) {
706 crtc = fb_helper->crtc_info[i].mode_set.crtc;
707 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
708 if (ret) {
709 mutex_unlock(&dev->mode_config.mutex);
710 return ret;
711 }
712 }
713 mutex_unlock(&dev->mode_config.mutex);
714
715 if (fb_helper->delayed_hotplug) {
716 fb_helper->delayed_hotplug = false;
717 drm_fb_helper_hotplug_event(fb_helper);
718 }
719 return 0;
720}
721EXPORT_SYMBOL(drm_fb_helper_set_par);
722
723int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
724 struct fb_info *info)
725{
726 struct drm_fb_helper *fb_helper = info->par;
727 struct drm_device *dev = fb_helper->dev;
728 struct drm_mode_set *modeset;
729 struct drm_crtc *crtc;
730 int ret = 0;
731 int i;
732
733 mutex_lock(&dev->mode_config.mutex);
734 for (i = 0; i < fb_helper->crtc_count; i++) {
735 crtc = fb_helper->crtc_info[i].mode_set.crtc;
736
737 modeset = &fb_helper->crtc_info[i].mode_set;
738
739 modeset->x = var->xoffset;
740 modeset->y = var->yoffset;
741
742 if (modeset->num_connectors) {
743 ret = crtc->funcs->set_config(modeset);
744 if (!ret) {
745 info->var.xoffset = var->xoffset;
746 info->var.yoffset = var->yoffset;
747 }
748 }
749 }
750 mutex_unlock(&dev->mode_config.mutex);
751 return ret;
752}
753EXPORT_SYMBOL(drm_fb_helper_pan_display);
754
755int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
756 int preferred_bpp)
757{
758 int new_fb = 0;
759 int crtc_count = 0;
760 int i;
761 struct fb_info *info;
762 struct drm_fb_helper_surface_size sizes;
763 int gamma_size = 0;
764
765 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
766 sizes.surface_depth = 24;
767 sizes.surface_bpp = 32;
768 sizes.fb_width = (unsigned)-1;
769 sizes.fb_height = (unsigned)-1;
770
771 /* if driver picks 8 or 16 by default use that
772 for both depth/bpp */
773 if (preferred_bpp != sizes.surface_bpp) {
774 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
775 }
776 /* first up get a count of crtcs now in use and new min/maxes width/heights */
777 for (i = 0; i < fb_helper->connector_count; i++) {
778 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
779 struct drm_cmdline_mode *cmdline_mode;
780
781 cmdline_mode = &fb_helper_conn->cmdline_mode;
782
783 if (cmdline_mode->bpp_specified) {
784 switch (cmdline_mode->bpp) {
785 case 8:
786 sizes.surface_depth = sizes.surface_bpp = 8;
787 break;
788 case 15:
789 sizes.surface_depth = 15;
790 sizes.surface_bpp = 16;
791 break;
792 case 16:
793 sizes.surface_depth = sizes.surface_bpp = 16;
794 break;
795 case 24:
796 sizes.surface_depth = sizes.surface_bpp = 24;
797 break;
798 case 32:
799 sizes.surface_depth = 24;
800 sizes.surface_bpp = 32;
801 break;
802 }
803 break;
804 }
805 }
806
807 crtc_count = 0;
808 for (i = 0; i < fb_helper->crtc_count; i++) {
809 struct drm_display_mode *desired_mode;
810 desired_mode = fb_helper->crtc_info[i].desired_mode;
811
812 if (desired_mode) {
813 if (gamma_size == 0)
814 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
815 if (desired_mode->hdisplay < sizes.fb_width)
816 sizes.fb_width = desired_mode->hdisplay;
817 if (desired_mode->vdisplay < sizes.fb_height)
818 sizes.fb_height = desired_mode->vdisplay;
819 if (desired_mode->hdisplay > sizes.surface_width)
820 sizes.surface_width = desired_mode->hdisplay;
821 if (desired_mode->vdisplay > sizes.surface_height)
822 sizes.surface_height = desired_mode->vdisplay;
823 crtc_count++;
824 }
825 }
826
827 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
828 /* hmm everyone went away - assume VGA cable just fell out
829 and will come back later. */
830 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
831 sizes.fb_width = sizes.surface_width = 1024;
832 sizes.fb_height = sizes.surface_height = 768;
833 }
834
835 /* push down into drivers */
836 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
837 if (new_fb < 0)
838 return new_fb;
839
840 info = fb_helper->fbdev;
841
842 /* set the fb pointer */
843 for (i = 0; i < fb_helper->crtc_count; i++) {
844 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
845 }
846
847 if (new_fb) {
848 info->var.pixclock = 0;
849 if (register_framebuffer(info) < 0) {
850 return -EINVAL;
851 }
852
853 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
854 info->fix.id);
855
856 } else {
857 drm_fb_helper_set_par(info);
858 }
859
860 /* Switch back to kernel console on panic */
861 /* multi card linked list maybe */
862 if (list_empty(&kernel_fb_helper_list)) {
863 printk(KERN_INFO "drm: registered panic notifier\n");
864 atomic_notifier_chain_register(&panic_notifier_list,
865 &paniced);
866 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
867 }
868 if (new_fb)
869 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
870
871 return 0;
872}
873EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
874
875void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
876 uint32_t depth)
877{
878 info->fix.type = FB_TYPE_PACKED_PIXELS;
879 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
880 FB_VISUAL_TRUECOLOR;
881 info->fix.mmio_start = 0;
882 info->fix.mmio_len = 0;
883 info->fix.type_aux = 0;
884 info->fix.xpanstep = 1; /* doing it in hw */
885 info->fix.ypanstep = 1; /* doing it in hw */
886 info->fix.ywrapstep = 0;
887 info->fix.accel = FB_ACCEL_NONE;
888 info->fix.type_aux = 0;
889
890 info->fix.line_length = pitch;
891 return;
892}
893EXPORT_SYMBOL(drm_fb_helper_fill_fix);
894
895void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
896 uint32_t fb_width, uint32_t fb_height)
897{
898 struct drm_framebuffer *fb = fb_helper->fb;
899 info->pseudo_palette = fb_helper->pseudo_palette;
900 info->var.xres_virtual = fb->width;
901 info->var.yres_virtual = fb->height;
902 info->var.bits_per_pixel = fb->bits_per_pixel;
903 info->var.accel_flags = FB_ACCELF_TEXT;
904 info->var.xoffset = 0;
905 info->var.yoffset = 0;
906 info->var.activate = FB_ACTIVATE_NOW;
907 info->var.height = -1;
908 info->var.width = -1;
909
910 switch (fb->depth) {
911 case 8:
912 info->var.red.offset = 0;
913 info->var.green.offset = 0;
914 info->var.blue.offset = 0;
915 info->var.red.length = 8; /* 8bit DAC */
916 info->var.green.length = 8;
917 info->var.blue.length = 8;
918 info->var.transp.offset = 0;
919 info->var.transp.length = 0;
920 break;
921 case 15:
922 info->var.red.offset = 10;
923 info->var.green.offset = 5;
924 info->var.blue.offset = 0;
925 info->var.red.length = 5;
926 info->var.green.length = 5;
927 info->var.blue.length = 5;
928 info->var.transp.offset = 15;
929 info->var.transp.length = 1;
930 break;
931 case 16:
932 info->var.red.offset = 11;
933 info->var.green.offset = 5;
934 info->var.blue.offset = 0;
935 info->var.red.length = 5;
936 info->var.green.length = 6;
937 info->var.blue.length = 5;
938 info->var.transp.offset = 0;
939 break;
940 case 24:
941 info->var.red.offset = 16;
942 info->var.green.offset = 8;
943 info->var.blue.offset = 0;
944 info->var.red.length = 8;
945 info->var.green.length = 8;
946 info->var.blue.length = 8;
947 info->var.transp.offset = 0;
948 info->var.transp.length = 0;
949 break;
950 case 32:
951 info->var.red.offset = 16;
952 info->var.green.offset = 8;
953 info->var.blue.offset = 0;
954 info->var.red.length = 8;
955 info->var.green.length = 8;
956 info->var.blue.length = 8;
957 info->var.transp.offset = 24;
958 info->var.transp.length = 8;
959 break;
960 default:
961 break;
962 }
963
964 info->var.xres = fb_width;
965 info->var.yres = fb_height;
966}
967EXPORT_SYMBOL(drm_fb_helper_fill_var);
968
969static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
970 uint32_t maxX,
971 uint32_t maxY)
972{
973 struct drm_connector *connector;
974 int count = 0;
975 int i;
976
977 for (i = 0; i < fb_helper->connector_count; i++) {
978 connector = fb_helper->connector_info[i]->connector;
979 count += connector->funcs->fill_modes(connector, maxX, maxY);
980 }
981
982 return count;
983}
984
985static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
986{
987 struct drm_display_mode *mode;
988
989 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
990 if (drm_mode_width(mode) > width ||
991 drm_mode_height(mode) > height)
992 continue;
993 if (mode->type & DRM_MODE_TYPE_PREFERRED)
994 return mode;
995 }
996 return NULL;
997}
998
999static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1000{
1001 struct drm_cmdline_mode *cmdline_mode;
1002 cmdline_mode = &fb_connector->cmdline_mode;
1003 return cmdline_mode->specified;
1004}
1005
1006static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1007 int width, int height)
1008{
1009 struct drm_cmdline_mode *cmdline_mode;
1010 struct drm_display_mode *mode = NULL;
1011
1012 cmdline_mode = &fb_helper_conn->cmdline_mode;
1013 if (cmdline_mode->specified == false)
1014 return mode;
1015
1016 /* attempt to find a matching mode in the list of modes
1017 * we have gotten so far, if not add a CVT mode that conforms
1018 */
1019 if (cmdline_mode->rb || cmdline_mode->margins)
1020 goto create_mode;
1021
1022 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1023 /* check width/height */
1024 if (mode->hdisplay != cmdline_mode->xres ||
1025 mode->vdisplay != cmdline_mode->yres)
1026 continue;
1027
1028 if (cmdline_mode->refresh_specified) {
1029 if (mode->vrefresh != cmdline_mode->refresh)
1030 continue;
1031 }
1032
1033 if (cmdline_mode->interlace) {
1034 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1035 continue;
1036 }
1037 return mode;
1038 }
1039
1040create_mode:
1041 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1042 cmdline_mode);
1043 list_add(&mode->head, &fb_helper_conn->connector->modes);
1044 return mode;
1045}
1046
1047static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1048{
1049 bool enable;
1050
1051 if (strict) {
1052 enable = connector->status == connector_status_connected;
1053 } else {
1054 enable = connector->status != connector_status_disconnected;
1055 }
1056 return enable;
1057}
1058
1059static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1060 bool *enabled)
1061{
1062 bool any_enabled = false;
1063 struct drm_connector *connector;
1064 int i = 0;
1065
1066 for (i = 0; i < fb_helper->connector_count; i++) {
1067 connector = fb_helper->connector_info[i]->connector;
1068 enabled[i] = drm_connector_enabled(connector, true);
1069 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1070 enabled[i] ? "yes" : "no");
1071 any_enabled |= enabled[i];
1072 }
1073
1074 if (any_enabled)
1075 return;
1076
1077 for (i = 0; i < fb_helper->connector_count; i++) {
1078 connector = fb_helper->connector_info[i]->connector;
1079 enabled[i] = drm_connector_enabled(connector, false);
1080 }
1081}
1082
1083static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1084 struct drm_display_mode **modes,
1085 bool *enabled, int width, int height)
1086{
1087 int count, i, j;
1088 bool can_clone = false;
1089 struct drm_fb_helper_connector *fb_helper_conn;
1090 struct drm_display_mode *dmt_mode, *mode;
1091
1092 /* only contemplate cloning in the single crtc case */
1093 if (fb_helper->crtc_count > 1)
1094 return false;
1095
1096 count = 0;
1097 for (i = 0; i < fb_helper->connector_count; i++) {
1098 if (enabled[i])
1099 count++;
1100 }
1101
1102 /* only contemplate cloning if more than one connector is enabled */
1103 if (count <= 1)
1104 return false;
1105
1106 /* check the command line or if nothing common pick 1024x768 */
1107 can_clone = true;
1108 for (i = 0; i < fb_helper->connector_count; i++) {
1109 if (!enabled[i])
1110 continue;
1111 fb_helper_conn = fb_helper->connector_info[i];
1112 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1113 if (!modes[i]) {
1114 can_clone = false;
1115 break;
1116 }
1117 for (j = 0; j < i; j++) {
1118 if (!enabled[j])
1119 continue;
1120 if (!drm_mode_equal(modes[j], modes[i]))
1121 can_clone = false;
1122 }
1123 }
1124
1125 if (can_clone) {
1126 DRM_DEBUG_KMS("can clone using command line\n");
1127 return true;
1128 }
1129
1130 /* try and find a 1024x768 mode on each connector */
1131 can_clone = true;
1132 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1133
1134 for (i = 0; i < fb_helper->connector_count; i++) {
1135
1136 if (!enabled[i])
1137 continue;
1138
1139 fb_helper_conn = fb_helper->connector_info[i];
1140 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1141 if (drm_mode_equal(mode, dmt_mode))
1142 modes[i] = mode;
1143 }
1144 if (!modes[i])
1145 can_clone = false;
1146 }
1147
1148 if (can_clone) {
1149 DRM_DEBUG_KMS("can clone using 1024x768\n");
1150 return true;
1151 }
1152 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1153 return false;
1154}
1155
1156static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1157 struct drm_display_mode **modes,
1158 bool *enabled, int width, int height)
1159{
1160 struct drm_fb_helper_connector *fb_helper_conn;
1161 int i;
1162
1163 for (i = 0; i < fb_helper->connector_count; i++) {
1164 fb_helper_conn = fb_helper->connector_info[i];
1165
1166 if (enabled[i] == false)
1167 continue;
1168
1169 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1170 fb_helper_conn->connector->base.id);
1171
1172 /* got for command line mode first */
1173 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1174 if (!modes[i]) {
1175 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1176 fb_helper_conn->connector->base.id);
1177 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1178 }
1179 /* No preferred modes, pick one off the list */
1180 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1181 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1182 break;
1183 }
1184 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1185 "none");
1186 }
1187 return true;
1188}
1189
1190static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1191 struct drm_fb_helper_crtc **best_crtcs,
1192 struct drm_display_mode **modes,
1193 int n, int width, int height)
1194{
1195 int c, o;
1196 struct drm_device *dev = fb_helper->dev;
1197 struct drm_connector *connector;
1198 struct drm_connector_helper_funcs *connector_funcs;
1199 struct drm_encoder *encoder;
1200 struct drm_fb_helper_crtc *best_crtc;
1201 int my_score, best_score, score;
1202 struct drm_fb_helper_crtc **crtcs, *crtc;
1203 struct drm_fb_helper_connector *fb_helper_conn;
1204
1205 if (n == fb_helper->connector_count)
1206 return 0;
1207
1208 fb_helper_conn = fb_helper->connector_info[n];
1209 connector = fb_helper_conn->connector;
1210
1211 best_crtcs[n] = NULL;
1212 best_crtc = NULL;
1213 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1214 if (modes[n] == NULL)
1215 return best_score;
1216
1217 crtcs = kzalloc(dev->mode_config.num_connector *
1218 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1219 if (!crtcs)
1220 return best_score;
1221
1222 my_score = 1;
1223 if (connector->status == connector_status_connected)
1224 my_score++;
1225 if (drm_has_cmdline_mode(fb_helper_conn))
1226 my_score++;
1227 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1228 my_score++;
1229
1230 connector_funcs = connector->helper_private;
1231 encoder = connector_funcs->best_encoder(connector);
1232 if (!encoder)
1233 goto out;
1234
1235 /* select a crtc for this connector and then attempt to configure
1236 remaining connectors */
1237 for (c = 0; c < fb_helper->crtc_count; c++) {
1238 crtc = &fb_helper->crtc_info[c];
1239
1240 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1241 continue;
1242 }
1243
1244 for (o = 0; o < n; o++)
1245 if (best_crtcs[o] == crtc)
1246 break;
1247
1248 if (o < n) {
1249 /* ignore cloning unless only a single crtc */
1250 if (fb_helper->crtc_count > 1)
1251 continue;
1252
1253 if (!drm_mode_equal(modes[o], modes[n]))
1254 continue;
1255 }
1256
1257 crtcs[n] = crtc;
1258 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1259 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1260 width, height);
1261 if (score > best_score) {
1262 best_crtc = crtc;
1263 best_score = score;
1264 memcpy(best_crtcs, crtcs,
1265 dev->mode_config.num_connector *
1266 sizeof(struct drm_fb_helper_crtc *));
1267 }
1268 }
1269out:
1270 kfree(crtcs);
1271 return best_score;
1272}
1273
1274static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1275{
1276 struct drm_device *dev = fb_helper->dev;
1277 struct drm_fb_helper_crtc **crtcs;
1278 struct drm_display_mode **modes;
1279 struct drm_encoder *encoder;
1280 struct drm_mode_set *modeset;
1281 bool *enabled;
1282 int width, height;
1283 int i, ret;
1284
1285 DRM_DEBUG_KMS("\n");
1286
1287 width = dev->mode_config.max_width;
1288 height = dev->mode_config.max_height;
1289
1290 /* clean out all the encoder/crtc combos */
1291 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1292 encoder->crtc = NULL;
1293 }
1294
1295 crtcs = kcalloc(dev->mode_config.num_connector,
1296 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1297 modes = kcalloc(dev->mode_config.num_connector,
1298 sizeof(struct drm_display_mode *), GFP_KERNEL);
1299 enabled = kcalloc(dev->mode_config.num_connector,
1300 sizeof(bool), GFP_KERNEL);
1301
1302 drm_enable_connectors(fb_helper, enabled);
1303
1304 ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1305 if (!ret) {
1306 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1307 if (!ret)
1308 DRM_ERROR("Unable to find initial modes\n");
1309 }
1310
1311 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1312
1313 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1314
1315 /* need to set the modesets up here for use later */
1316 /* fill out the connector<->crtc mappings into the modesets */
1317 for (i = 0; i < fb_helper->crtc_count; i++) {
1318 modeset = &fb_helper->crtc_info[i].mode_set;
1319 modeset->num_connectors = 0;
1320 }
1321
1322 for (i = 0; i < fb_helper->connector_count; i++) {
1323 struct drm_display_mode *mode = modes[i];
1324 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1325 modeset = &fb_crtc->mode_set;
1326
1327 if (mode && fb_crtc) {
1328 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1329 mode->name, fb_crtc->mode_set.crtc->base.id);
1330 fb_crtc->desired_mode = mode;
1331 if (modeset->mode)
1332 drm_mode_destroy(dev, modeset->mode);
1333 modeset->mode = drm_mode_duplicate(dev,
1334 fb_crtc->desired_mode);
1335 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1336 }
1337 }
1338
1339 kfree(crtcs);
1340 kfree(modes);
1341 kfree(enabled);
1342}
1343
1344/**
1345 * drm_helper_initial_config - setup a sane initial connector configuration
1346 * @dev: DRM device
1347 *
1348 * LOCKING:
1349 * Called at init time, must take mode config lock.
1350 *
1351 * Scan the CRTCs and connectors and try to put together an initial setup.
1352 * At the moment, this is a cloned configuration across all heads with
1353 * a new framebuffer object as the backing store.
1354 *
1355 * RETURNS:
1356 * Zero if everything went ok, nonzero otherwise.
1357 */
1358bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1359{
1360 struct drm_device *dev = fb_helper->dev;
1361 int count = 0;
1362
1363 /* disable all the possible outputs/crtcs before entering KMS mode */
1364 drm_helper_disable_unused_functions(fb_helper->dev);
1365
1366 drm_fb_helper_parse_command_line(fb_helper);
1367
1368 count = drm_fb_helper_probe_connector_modes(fb_helper,
1369 dev->mode_config.max_width,
1370 dev->mode_config.max_height);
1371 /*
1372 * we shouldn't end up with no modes here.
1373 */
1374 if (count == 0) {
1375 printk(KERN_INFO "No connectors reported connected with modes\n");
1376 }
1377 drm_setup_crtcs(fb_helper);
1378
1379 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1380}
1381EXPORT_SYMBOL(drm_fb_helper_initial_config);
1382
1383/**
1384 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1385 * probing all the outputs attached to the fb.
1386 * @fb_helper: the drm_fb_helper
1387 *
1388 * LOCKING:
1389 * Called at runtime, must take mode config lock.
1390 *
1391 * Scan the connectors attached to the fb_helper and try to put together a
1392 * setup after *notification of a change in output configuration.
1393 *
1394 * RETURNS:
1395 * 0 on success and a non-zero error code otherwise.
1396 */
1397int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1398{
1399 struct drm_device *dev = fb_helper->dev;
1400 int count = 0;
1401 u32 max_width, max_height, bpp_sel;
1402 bool bound = false, crtcs_bound = false;
1403 struct drm_crtc *crtc;
1404
1405 if (!fb_helper->fb)
1406 return 0;
1407
1408 mutex_lock(&dev->mode_config.mutex);
1409 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1410 if (crtc->fb)
1411 crtcs_bound = true;
1412 if (crtc->fb == fb_helper->fb)
1413 bound = true;
1414 }
1415
1416 if (!bound && crtcs_bound) {
1417 fb_helper->delayed_hotplug = true;
1418 mutex_unlock(&dev->mode_config.mutex);
1419 return 0;
1420 }
1421 DRM_DEBUG_KMS("\n");
1422
1423 max_width = fb_helper->fb->width;
1424 max_height = fb_helper->fb->height;
1425 bpp_sel = fb_helper->fb->bits_per_pixel;
1426
1427 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1428 max_height);
1429 drm_setup_crtcs(fb_helper);
1430 mutex_unlock(&dev->mode_config.mutex);
1431
1432 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1433}
1434EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1435
1436/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1437 * but the module doesn't depend on any fb console symbols. At least
1438 * attempt to load fbcon to avoid leaving the system without a usable console.
1439 */
1440#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1441static int __init drm_fb_helper_modinit(void)
1442{
1443 const char *name = "fbcon";
1444 struct module *fbcon;
1445
1446 mutex_lock(&module_mutex);
1447 fbcon = find_module(name);
1448 mutex_unlock(&module_mutex);
1449
1450 if (!fbcon)
1451 request_module_nowait(name);
1452 return 0;
1453}
1454
1455module_init(drm_fb_helper_modinit);
1456#endif