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drm/i915: Update to Linux 3.16
[dragonfly.git] / sys / dev / drm / drm_fb_helper.c
blob9f6d4b5f3fe9e99939e4225c0135f5ae06df8a8e
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
31 #include <linux/kernel.h>
32 #include <linux/fb.h>
33 #include <linux/module.h>
34 #include <drm/drmP.h>
35 #include <drm/drm_crtc.h>
36 #include <drm/drm_fb_helper.h>
37 #include <drm/drm_crtc_helper.h>
38
39 static LINUX_LIST_HEAD(kernel_fb_helper_list);
40
41 /**
42 * DOC: fbdev helpers
43 *
44 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
45 * mode setting driver. They can be used mostly independently from the crtc
46 * helper functions used by many drivers to implement the kernel mode setting
47 * interfaces.
48 *
49 * Initialization is done as a three-step process with drm_fb_helper_init(),
50 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
51 * Drivers with fancier requirements than the default behaviour can override the
52 * second step with their own code. Teardown is done with drm_fb_helper_fini().
53 *
54 * At runtime drivers should restore the fbdev console by calling
55 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
56 * should also notify the fb helper code from updates to the output
57 * configuration by calling drm_fb_helper_hotplug_event(). For easier
58 * integration with the output polling code in drm_crtc_helper.c the modeset
59 * code provides a ->output_poll_changed callback.
60 *
61 * All other functions exported by the fb helper library can be used to
62 * implement the fbdev driver interface by the driver.
63 */
64
65 /**
66 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
67 * emulation helper
68 * @fb_helper: fbdev initialized with drm_fb_helper_init
69 *
70 * This functions adds all the available connectors for use with the given
71 * fb_helper. This is a separate step to allow drivers to freely assign
72 * connectors to the fbdev, e.g. if some are reserved for special purposes or
73 * not adequate to be used for the fbcon.
74 *
75 * Since this is part of the initial setup before the fbdev is published, no
76 * locking is required.
77 */
78 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
79 {
80 struct drm_device *dev = fb_helper->dev;
81 struct drm_connector *connector;
82 int i;
83
84 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
85 struct drm_fb_helper_connector *fb_helper_connector;
86
87 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
88 if (!fb_helper_connector)
89 goto fail;
90
91 fb_helper_connector->connector = connector;
92 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
93 }
94 return 0;
95 fail:
96 for (i = 0; i < fb_helper->connector_count; i++) {
97 kfree(fb_helper->connector_info[i]);
98 fb_helper->connector_info[i] = NULL;
99 }
100 fb_helper->connector_count = 0;
101 return -ENOMEM;
102 }
103 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
104
105 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
106 {
107 struct drm_fb_helper_connector *fb_helper_conn;
108 int i;
109
110 for (i = 0; i < fb_helper->connector_count; i++) {
111 struct drm_cmdline_mode *mode;
112 struct drm_connector *connector;
113 char *option = NULL;
114
115 fb_helper_conn = fb_helper->connector_info[i];
116 connector = fb_helper_conn->connector;
117 mode = &fb_helper_conn->cmdline_mode;
118
119 /* do something on return - turn off connector maybe */
120 if (fb_get_options(connector->name, &option))
121 continue;
122
123 if (drm_mode_parse_command_line_for_connector(option,
124 connector,
125 mode)) {
126 if (mode->force) {
127 const char *s;
128 switch (mode->force) {
129 case DRM_FORCE_OFF:
130 s = "OFF";
131 break;
132 case DRM_FORCE_ON_DIGITAL:
133 s = "ON - dig";
134 break;
135 default:
136 case DRM_FORCE_ON:
137 s = "ON";
138 break;
139 }
140
141 DRM_INFO("forcing %s connector %s\n",
142 connector->name, s);
143 connector->force = mode->force;
144 }
145
146 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
147 connector->name,
148 mode->xres, mode->yres,
149 mode->refresh_specified ? mode->refresh : 60,
150 mode->rb ? " reduced blanking" : "",
151 mode->margins ? " with margins" : "",
152 mode->interlace ? " interlaced" : "");
153 }
154
155 }
156 return 0;
157 }
158
159 #if 0
160 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
161 {
162 uint16_t *r_base, *g_base, *b_base;
163 int i;
164
165 if (helper->funcs->gamma_get == NULL)
166 return;
167
168 r_base = crtc->gamma_store;
169 g_base = r_base + crtc->gamma_size;
170 b_base = g_base + crtc->gamma_size;
171
172 for (i = 0; i < crtc->gamma_size; i++)
173 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
174 }
175
176 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
177 {
178 uint16_t *r_base, *g_base, *b_base;
179
180 if (crtc->funcs->gamma_set == NULL)
181 return;
182
183 r_base = crtc->gamma_store;
184 g_base = r_base + crtc->gamma_size;
185 b_base = g_base + crtc->gamma_size;
186
187 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
188 }
189
190 /**
191 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
192 * @info: fbdev registered by the helper
193 */
194 int drm_fb_helper_debug_enter(struct fb_info *info)
195 {
196 struct drm_fb_helper *helper = info->par;
197 struct drm_crtc_helper_funcs *funcs;
198 int i;
199
200 if (list_empty(&kernel_fb_helper_list))
201 return false;
202
203 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
204 for (i = 0; i < helper->crtc_count; i++) {
205 struct drm_mode_set *mode_set =
206 &helper->crtc_info[i].mode_set;
207
208 if (!mode_set->crtc->enabled)
209 continue;
210
211 funcs = mode_set->crtc->helper_private;
212 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
213 funcs->mode_set_base_atomic(mode_set->crtc,
214 mode_set->fb,
215 mode_set->x,
216 mode_set->y,
217 ENTER_ATOMIC_MODE_SET);
218 }
219 }
220
221 return 0;
222 }
223 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
224
225 /* Find the real fb for a given fb helper CRTC */
226 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
227 {
228 struct drm_device *dev = crtc->dev;
229 struct drm_crtc *c;
230
231 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
232 if (crtc->base.id == c->base.id)
233 return c->primary->fb;
234 }
235
236 return NULL;
237 }
238
239 /**
240 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
241 * @info: fbdev registered by the helper
242 */
243 int drm_fb_helper_debug_leave(struct fb_info *info)
244 {
245 struct drm_fb_helper *helper = info->par;
246 struct drm_crtc *crtc;
247 struct drm_crtc_helper_funcs *funcs;
248 struct drm_framebuffer *fb;
249 int i;
250
251 for (i = 0; i < helper->crtc_count; i++) {
252 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
253 crtc = mode_set->crtc;
254 funcs = crtc->helper_private;
255 fb = drm_mode_config_fb(crtc);
256
257 if (!crtc->enabled)
258 continue;
259
260 if (!fb) {
261 DRM_ERROR("no fb to restore??\n");
262 continue;
263 }
264
265 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
266 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
267 crtc->y, LEAVE_ATOMIC_MODE_SET);
268 }
269
270 return 0;
271 }
272 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
273 #endif
274
275 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
276 {
277 struct drm_device *dev = fb_helper->dev;
278 struct drm_plane *plane;
279 bool error = false;
280 int i;
281
282 drm_warn_on_modeset_not_all_locked(dev);
283
284 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
285 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
286 drm_plane_force_disable(plane);
287
288 for (i = 0; i < fb_helper->crtc_count; i++) {
289 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
290 struct drm_crtc *crtc = mode_set->crtc;
291 int ret;
292
293 if (crtc->funcs->cursor_set) {
294 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
295 if (ret)
296 error = true;
297 }
298
299 ret = drm_mode_set_config_internal(mode_set);
300 if (ret)
301 error = true;
302 }
303 return error;
304 }
305 /**
306 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
307 * @fb_helper: fbcon to restore
308 *
309 * This should be called from driver's drm ->lastclose callback
310 * when implementing an fbcon on top of kms using this helper. This ensures that
311 * the user isn't greeted with a black screen when e.g. X dies.
312 *
313 * Use this variant if you need to bypass locking (panic), or already
314 * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
315 */
316 static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
317 {
318 return restore_fbdev_mode(fb_helper);
319 }
320
321 /**
322 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
323 * @fb_helper: fbcon to restore
324 *
325 * This should be called from driver's drm ->lastclose callback
326 * when implementing an fbcon on top of kms using this helper. This ensures that
327 * the user isn't greeted with a black screen when e.g. X dies.
328 */
329 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
330 {
331 struct drm_device *dev = fb_helper->dev;
332 bool ret;
333 drm_modeset_lock_all(dev);
334 ret = restore_fbdev_mode(fb_helper);
335 drm_modeset_unlock_all(dev);
336 return ret;
337 }
338 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
339
340 #if 0
341 /*
342 * restore fbcon display for all kms driver's using this helper, used for sysrq
343 * and panic handling.
344 */
345 static bool drm_fb_helper_force_kernel_mode(void)
346 {
347 bool ret, error = false;
348 struct drm_fb_helper *helper;
349
350 if (list_empty(&kernel_fb_helper_list))
351 return false;
352
353 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
354 struct drm_device *dev = helper->dev;
355
356 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
357 continue;
358
359 /* NOTE: we use lockless flag below to avoid grabbing other
360 * modeset locks. So just trylock the underlying mutex
361 * directly:
362 */
363 if (!mutex_trylock(&dev->mode_config.mutex)) {
364 error = true;
365 continue;
366 }
367
368 ret = drm_fb_helper_restore_fbdev_mode(helper);
369 if (ret)
370 error = true;
371
372 mutex_unlock(&dev->mode_config.mutex);
373 }
374 return error;
375 }
376
377 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
378 void *panic_str)
379 {
380 /*
381 * It's a waste of time and effort to switch back to text console
382 * if the kernel should reboot before panic messages can be seen.
383 */
384 if (panic_timeout < 0)
385 return 0;
386
387 pr_err("panic occurred, switching back to text console\n");
388 return drm_fb_helper_force_kernel_mode();
389 }
390
391 static struct notifier_block paniced = {
392 .notifier_call = drm_fb_helper_panic,
393 };
394 #endif
395
396 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
397 {
398 struct drm_device *dev = fb_helper->dev;
399 struct drm_crtc *crtc;
400 int bound = 0, crtcs_bound = 0;
401
402 #if 0
403 /* Sometimes user space wants everything disabled, so don't steal the
404 * display if there's a master. */
405 if (dev->primary->master)
406 return false;
407 #endif
408
409 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
410 if (crtc->primary->fb)
411 crtcs_bound++;
412 if (crtc->primary->fb == fb_helper->fb)
413 bound++;
414 }
415
416 if (bound < crtcs_bound)
417 return false;
418
419 return true;
420 }
421
422 #if 0
423 #ifdef CONFIG_MAGIC_SYSRQ
424 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
425 {
426 bool ret;
427 ret = drm_fb_helper_force_kernel_mode();
428 if (ret == true)
429 DRM_ERROR("Failed to restore crtc configuration\n");
430 }
431 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
432
433 static void drm_fb_helper_sysrq(int dummy1)
434 {
435 schedule_work(&drm_fb_helper_restore_work);
436 }
437
438 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
439 .handler = drm_fb_helper_sysrq,
440 .help_msg = "force-fb(V)",
441 .action_msg = "Restore framebuffer console",
442 };
443 #else
444 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
445 #endif
446
447 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
448 {
449 struct drm_fb_helper *fb_helper = info->par;
450 struct drm_device *dev = fb_helper->dev;
451 struct drm_crtc *crtc;
452 struct drm_connector *connector;
453 int i, j;
454
455 /*
456 * fbdev->blank can be called from irq context in case of a panic.
457 * Since we already have our own special panic handler which will
458 * restore the fbdev console mode completely, just bail out early.
459 */
460 if (oops_in_progress)
461 return;
462
463 /*
464 * For each CRTC in this fb, turn the connectors on/off.
465 */
466 drm_modeset_lock_all(dev);
467 if (!drm_fb_helper_is_bound(fb_helper)) {
468 drm_modeset_unlock_all(dev);
469 return;
470 }
471
472 for (i = 0; i < fb_helper->crtc_count; i++) {
473 crtc = fb_helper->crtc_info[i].mode_set.crtc;
474
475 if (!crtc->enabled)
476 continue;
477
478 /* Walk the connectors & encoders on this fb turning them on/off */
479 for (j = 0; j < fb_helper->connector_count; j++) {
480 connector = fb_helper->connector_info[j]->connector;
481 connector->funcs->dpms(connector, dpms_mode);
482 drm_object_property_set_value(&connector->base,
483 dev->mode_config.dpms_property, dpms_mode);
484 }
485 }
486 drm_modeset_unlock_all(dev);
487 }
488
489 /**
490 * drm_fb_helper_blank - implementation for ->fb_blank
491 * @blank: desired blanking state
492 * @info: fbdev registered by the helper
493 */
494 int drm_fb_helper_blank(int blank, struct fb_info *info)
495 {
496 switch (blank) {
497 /* Display: On; HSync: On, VSync: On */
498 case FB_BLANK_UNBLANK:
499 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
500 break;
501 /* Display: Off; HSync: On, VSync: On */
502 case FB_BLANK_NORMAL:
503 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
504 break;
505 /* Display: Off; HSync: Off, VSync: On */
506 case FB_BLANK_HSYNC_SUSPEND:
507 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
508 break;
509 /* Display: Off; HSync: On, VSync: Off */
510 case FB_BLANK_VSYNC_SUSPEND:
511 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
512 break;
513 /* Display: Off; HSync: Off, VSync: Off */
514 case FB_BLANK_POWERDOWN:
515 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
516 break;
517 }
518 return 0;
519 }
520 EXPORT_SYMBOL(drm_fb_helper_blank);
521 #endif
522
523 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
524 {
525 int i;
526
527 for (i = 0; i < helper->connector_count; i++)
528 kfree(helper->connector_info[i]);
529 kfree(helper->connector_info);
530 for (i = 0; i < helper->crtc_count; i++) {
531 kfree(helper->crtc_info[i].mode_set.connectors);
532 if (helper->crtc_info[i].mode_set.mode)
533 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
534 }
535 kfree(helper->crtc_info);
536 }
537
538 /**
539 * drm_fb_helper_init - initialize a drm_fb_helper structure
540 * @dev: drm device
541 * @fb_helper: driver-allocated fbdev helper structure to initialize
542 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
543 * @max_conn_count: max connector count
544 *
545 * This allocates the structures for the fbdev helper with the given limits.
546 * Note that this won't yet touch the hardware (through the driver interfaces)
547 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
548 * to allow driver writes more control over the exact init sequence.
549 *
550 * Drivers must set fb_helper->funcs before calling
551 * drm_fb_helper_initial_config().
552 *
553 * RETURNS:
554 * Zero if everything went ok, nonzero otherwise.
555 */
556 int drm_fb_helper_init(struct drm_device *dev,
557 struct drm_fb_helper *fb_helper,
558 int crtc_count, int max_conn_count)
559 {
560 struct drm_crtc *crtc;
561 int i;
562
563 if (!max_conn_count)
564 return -EINVAL;
565
566 fb_helper->dev = dev;
567
568 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
569
570 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
571 if (!fb_helper->crtc_info)
572 return -ENOMEM;
573
574 fb_helper->crtc_count = crtc_count;
575 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
576 if (!fb_helper->connector_info) {
577 kfree(fb_helper->crtc_info);
578 return -ENOMEM;
579 }
580 fb_helper->connector_count = 0;
581
582 for (i = 0; i < crtc_count; i++) {
583 fb_helper->crtc_info[i].mode_set.connectors =
584 kcalloc(max_conn_count,
585 sizeof(struct drm_connector *),
586 GFP_KERNEL);
587
588 if (!fb_helper->crtc_info[i].mode_set.connectors)
589 goto out_free;
590 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
591 }
592
593 i = 0;
594 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
595 fb_helper->crtc_info[i].mode_set.crtc = crtc;
596 i++;
597 }
598
599 return 0;
600 out_free:
601 drm_fb_helper_crtc_free(fb_helper);
602 return -ENOMEM;
603 }
604 EXPORT_SYMBOL(drm_fb_helper_init);
605
606 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
607 {
608 if (!list_empty(&fb_helper->kernel_fb_list)) {
609 list_del(&fb_helper->kernel_fb_list);
610 if (list_empty(&kernel_fb_helper_list)) {
611 #if 0
612 pr_info("drm: unregistered panic notifier\n");
613 atomic_notifier_chain_unregister(&panic_notifier_list,
614 &paniced);
615 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
616 #endif
617 }
618 }
619
620 drm_fb_helper_crtc_free(fb_helper);
621
622 }
623 EXPORT_SYMBOL(drm_fb_helper_fini);
624
625 #if 0
626 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
627 u16 blue, u16 regno, struct fb_info *info)
628 {
629 struct drm_fb_helper *fb_helper = info->par;
630 struct drm_framebuffer *fb = fb_helper->fb;
631 int pindex;
632
633 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
634 u32 *palette;
635 u32 value;
636 /* place color in psuedopalette */
637 if (regno > 16)
638 return -EINVAL;
639 palette = (u32 *)info->pseudo_palette;
640 red >>= (16 - info->var.red.length);
641 green >>= (16 - info->var.green.length);
642 blue >>= (16 - info->var.blue.length);
643 value = (red << info->var.red.offset) |
644 (green << info->var.green.offset) |
645 (blue << info->var.blue.offset);
646 if (info->var.transp.length > 0) {
647 u32 mask = (1 << info->var.transp.length) - 1;
648 mask <<= info->var.transp.offset;
649 value |= mask;
650 }
651 palette[regno] = value;
652 return 0;
653 }
654
655 /*
656 * The driver really shouldn't advertise pseudo/directcolor
657 * visuals if it can't deal with the palette.
658 */
659 if (WARN_ON(!fb_helper->funcs->gamma_set ||
660 !fb_helper->funcs->gamma_get))
661 return -EINVAL;
662
663 pindex = regno;
664
665 if (fb->bits_per_pixel == 16) {
666 pindex = regno << 3;
667
668 if (fb->depth == 16 && regno > 63)
669 return -EINVAL;
670 if (fb->depth == 15 && regno > 31)
671 return -EINVAL;
672
673 if (fb->depth == 16) {
674 u16 r, g, b;
675 int i;
676 if (regno < 32) {
677 for (i = 0; i < 8; i++)
678 fb_helper->funcs->gamma_set(crtc, red,
679 green, blue, pindex + i);
680 }
681
682 fb_helper->funcs->gamma_get(crtc, &r,
683 &g, &b,
684 pindex >> 1);
685
686 for (i = 0; i < 4; i++)
687 fb_helper->funcs->gamma_set(crtc, r,
688 green, b,
689 (pindex >> 1) + i);
690 }
691 }
692
693 if (fb->depth != 16)
694 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
695 return 0;
696 }
697
698 /**
699 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
700 * @cmap: cmap to set
701 * @info: fbdev registered by the helper
702 */
703 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
704 {
705 struct drm_fb_helper *fb_helper = info->par;
706 struct drm_device *dev = fb_helper->dev;
707 struct drm_crtc_helper_funcs *crtc_funcs;
708 u16 *red, *green, *blue, *transp;
709 struct drm_crtc *crtc;
710 int i, j, rc = 0;
711 int start;
712
713 drm_modeset_lock_all(dev);
714 if (!drm_fb_helper_is_bound(fb_helper)) {
715 drm_modeset_unlock_all(dev);
716 return -EBUSY;
717 }
718
719 for (i = 0; i < fb_helper->crtc_count; i++) {
720 crtc = fb_helper->crtc_info[i].mode_set.crtc;
721 crtc_funcs = crtc->helper_private;
722
723 red = cmap->red;
724 green = cmap->green;
725 blue = cmap->blue;
726 transp = cmap->transp;
727 start = cmap->start;
728
729 for (j = 0; j < cmap->len; j++) {
730 u16 hred, hgreen, hblue, htransp = 0xffff;
731
732 hred = *red++;
733 hgreen = *green++;
734 hblue = *blue++;
735
736 if (transp)
737 htransp = *transp++;
738
739 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
740 if (rc)
741 goto out;
742 }
743 if (crtc_funcs->load_lut)
744 crtc_funcs->load_lut(crtc);
745 }
746 out:
747 drm_modeset_unlock_all(dev);
748 return rc;
749 }
750 EXPORT_SYMBOL(drm_fb_helper_setcmap);
751
752 /**
753 * drm_fb_helper_check_var - implementation for ->fb_check_var
754 * @var: screeninfo to check
755 * @info: fbdev registered by the helper
756 */
757 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
758 struct fb_info *info)
759 {
760 struct drm_fb_helper *fb_helper = info->par;
761 struct drm_framebuffer *fb = fb_helper->fb;
762 int depth;
763
764 if (var->pixclock != 0 || in_dbg_master())
765 return -EINVAL;
766
767 /* Need to resize the fb object !!! */
768 if (var->bits_per_pixel > fb->bits_per_pixel ||
769 var->xres > fb->width || var->yres > fb->height ||
770 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
771 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
772 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
773 var->xres, var->yres, var->bits_per_pixel,
774 var->xres_virtual, var->yres_virtual,
775 fb->width, fb->height, fb->bits_per_pixel);
776 return -EINVAL;
777 }
778
779 switch (var->bits_per_pixel) {
780 case 16:
781 depth = (var->green.length == 6) ? 16 : 15;
782 break;
783 case 32:
784 depth = (var->transp.length > 0) ? 32 : 24;
785 break;
786 default:
787 depth = var->bits_per_pixel;
788 break;
789 }
790
791 switch (depth) {
792 case 8:
793 var->red.offset = 0;
794 var->green.offset = 0;
795 var->blue.offset = 0;
796 var->red.length = 8;
797 var->green.length = 8;
798 var->blue.length = 8;
799 var->transp.length = 0;
800 var->transp.offset = 0;
801 break;
802 case 15:
803 var->red.offset = 10;
804 var->green.offset = 5;
805 var->blue.offset = 0;
806 var->red.length = 5;
807 var->green.length = 5;
808 var->blue.length = 5;
809 var->transp.length = 1;
810 var->transp.offset = 15;
811 break;
812 case 16:
813 var->red.offset = 11;
814 var->green.offset = 5;
815 var->blue.offset = 0;
816 var->red.length = 5;
817 var->green.length = 6;
818 var->blue.length = 5;
819 var->transp.length = 0;
820 var->transp.offset = 0;
821 break;
822 case 24:
823 var->red.offset = 16;
824 var->green.offset = 8;
825 var->blue.offset = 0;
826 var->red.length = 8;
827 var->green.length = 8;
828 var->blue.length = 8;
829 var->transp.length = 0;
830 var->transp.offset = 0;
831 break;
832 case 32:
833 var->red.offset = 16;
834 var->green.offset = 8;
835 var->blue.offset = 0;
836 var->red.length = 8;
837 var->green.length = 8;
838 var->blue.length = 8;
839 var->transp.length = 8;
840 var->transp.offset = 24;
841 break;
842 default:
843 return -EINVAL;
844 }
845 return 0;
846 }
847 EXPORT_SYMBOL(drm_fb_helper_check_var);
848
849 /**
850 * drm_fb_helper_set_par - implementation for ->fb_set_par
851 * @info: fbdev registered by the helper
852 *
853 * This will let fbcon do the mode init and is called at initialization time by
854 * the fbdev core when registering the driver, and later on through the hotplug
855 * callback.
856 */
857 int drm_fb_helper_set_par(struct fb_info *info)
858 {
859 struct drm_fb_helper *fb_helper = info->par;
860 struct fb_var_screeninfo *var = &info->var;
861
862 if (var->pixclock != 0) {
863 DRM_ERROR("PIXEL CLOCK SET\n");
864 return -EINVAL;
865 }
866
867 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
868
869 if (fb_helper->delayed_hotplug) {
870 fb_helper->delayed_hotplug = false;
871 drm_fb_helper_hotplug_event(fb_helper);
872 }
873 return 0;
874 }
875 EXPORT_SYMBOL(drm_fb_helper_set_par);
876
877 /**
878 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
879 * @var: updated screen information
880 * @info: fbdev registered by the helper
881 */
882 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
883 struct fb_info *info)
884 {
885 struct drm_fb_helper *fb_helper = info->par;
886 struct drm_device *dev = fb_helper->dev;
887 struct drm_mode_set *modeset;
888 int ret = 0;
889 int i;
890
891 drm_modeset_lock_all(dev);
892 if (!drm_fb_helper_is_bound(fb_helper)) {
893 drm_modeset_unlock_all(dev);
894 return -EBUSY;
895 }
896
897 for (i = 0; i < fb_helper->crtc_count; i++) {
898 modeset = &fb_helper->crtc_info[i].mode_set;
899
900 modeset->x = var->xoffset;
901 modeset->y = var->yoffset;
902
903 if (modeset->num_connectors) {
904 ret = drm_mode_set_config_internal(modeset);
905 if (!ret) {
906 info->var.xoffset = var->xoffset;
907 info->var.yoffset = var->yoffset;
908 }
909 }
910 }
911 drm_modeset_unlock_all(dev);
912 return ret;
913 }
914 EXPORT_SYMBOL(drm_fb_helper_pan_display);
915 #endif
916
917 /* XXX: DragonFly-specific */
918 static void
919 do_restore_fbdev_mode(void *context, int pending)
920 {
921 struct drm_fb_helper *fb_helper = context;
922 struct drm_device *dev = fb_helper->dev;
923
924 if (!fb_helper->fb)
925 return;
926
927 drm_modeset_lock_all(dev);
928 drm_fb_helper_restore_fbdev_mode(fb_helper);
929 drm_modeset_unlock_all(dev);
930 }
931
932 /* XXX: DragonFly-specific */
933 static void
934 sc_restore_fbdev_mode(void *cookie)
935 {
936 struct drm_fb_helper *fb_helper = cookie;
937
938 if (!fb_helper->fb)
939 return;
940
941 taskqueue_enqueue(taskqueue_thread[0], &fb_helper->fb_mode_task);
942 }
943
944 /*
945 * Allocates the backing storage and sets up the fbdev info structure through
946 * the ->fb_probe callback and then registers the fbdev and sets up the panic
947 * notifier.
948 */
949 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
950 int preferred_bpp)
951 {
952 int ret = 0;
953 int crtc_count = 0;
954 int i;
955 struct fb_info *info;
956 struct drm_fb_helper_surface_size sizes;
957 int gamma_size = 0;
958 int kms_console = 1; /* XXX: DragonFly-specific */
959
960 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
961 sizes.surface_depth = 24;
962 sizes.surface_bpp = 32;
963 sizes.fb_width = (unsigned)-1;
964 sizes.fb_height = (unsigned)-1;
965
966 /* if driver picks 8 or 16 by default use that
967 for both depth/bpp */
968 if (preferred_bpp != sizes.surface_bpp)
969 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
970
971 /* first up get a count of crtcs now in use and new min/maxes width/heights */
972 for (i = 0; i < fb_helper->connector_count; i++) {
973 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
974 struct drm_cmdline_mode *cmdline_mode;
975
976 cmdline_mode = &fb_helper_conn->cmdline_mode;
977
978 if (cmdline_mode->bpp_specified) {
979 switch (cmdline_mode->bpp) {
980 case 8:
981 sizes.surface_depth = sizes.surface_bpp = 8;
982 break;
983 case 15:
984 sizes.surface_depth = 15;
985 sizes.surface_bpp = 16;
986 break;
987 case 16:
988 sizes.surface_depth = sizes.surface_bpp = 16;
989 break;
990 case 24:
991 sizes.surface_depth = sizes.surface_bpp = 24;
992 break;
993 case 32:
994 sizes.surface_depth = 24;
995 sizes.surface_bpp = 32;
996 break;
997 }
998 break;
999 }
1000 }
1001
1002 crtc_count = 0;
1003 for (i = 0; i < fb_helper->crtc_count; i++) {
1004 struct drm_display_mode *desired_mode;
1005 desired_mode = fb_helper->crtc_info[i].desired_mode;
1006
1007 if (desired_mode) {
1008 if (gamma_size == 0)
1009 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1010 if (desired_mode->hdisplay < sizes.fb_width)
1011 sizes.fb_width = desired_mode->hdisplay;
1012 if (desired_mode->vdisplay < sizes.fb_height)
1013 sizes.fb_height = desired_mode->vdisplay;
1014 if (desired_mode->hdisplay > sizes.surface_width)
1015 sizes.surface_width = desired_mode->hdisplay;
1016 if (desired_mode->vdisplay > sizes.surface_height)
1017 sizes.surface_height = desired_mode->vdisplay;
1018 crtc_count++;
1019 }
1020 }
1021
1022 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1023 /* hmm everyone went away - assume VGA cable just fell out
1024 and will come back later. */
1025 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1026 sizes.fb_width = sizes.surface_width = 1024;
1027 sizes.fb_height = sizes.surface_height = 768;
1028 }
1029
1030 /* push down into drivers */
1031 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1032 if (ret < 0)
1033 return ret;
1034
1035 info = fb_helper->fbdev;
1036
1037 /*
1038 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1039 * events, but at init time drm_setup_crtcs needs to be called before
1040 * the fb is allocated (since we need to figure out the desired size of
1041 * the fb before we can allocate it ...). Hence we need to fix things up
1042 * here again.
1043 */
1044 for (i = 0; i < fb_helper->crtc_count; i++)
1045 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1046 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1047
1048
1049 /* XXX: DragonFly-specific */
1050 TUNABLE_INT_FETCH("kern.kms_console", &kms_console);
1051 if (kms_console) {
1052 TASK_INIT(&fb_helper->fb_mode_task, 0, do_restore_fbdev_mode,
1053 fb_helper);
1054 info->cookie = fb_helper;
1055 info->restore = (void *)&sc_restore_fbdev_mode;
1056 if (register_framebuffer(info) < 0)
1057 return -EINVAL;
1058 }
1059
1060 #if 0
1061 info->var.pixclock = 0;
1062 if (register_framebuffer(info) < 0)
1063 return -EINVAL;
1064
1065 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1066 info->node, info->fix.id);
1067
1068 /* Switch back to kernel console on panic */
1069 /* multi card linked list maybe */
1070 if (list_empty(&kernel_fb_helper_list)) {
1071 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1072 atomic_notifier_chain_register(&panic_notifier_list,
1073 &paniced);
1074 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1075 }
1076
1077 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1078 #endif
1079
1080 return 0;
1081 }
1082
1083 #if 0
1084 /**
1085 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1086 * @info: fbdev registered by the helper
1087 * @pitch: desired pitch
1088 * @depth: desired depth
1089 *
1090 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1091 * fbdev emulations. Drivers which support acceleration methods which impose
1092 * additional constraints need to set up their own limits.
1093 *
1094 * Drivers should call this (or their equivalent setup code) from their
1095 * ->fb_probe callback.
1096 */
1097 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1098 uint32_t depth)
1099 {
1100 info->fix.type = FB_TYPE_PACKED_PIXELS;
1101 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1102 FB_VISUAL_TRUECOLOR;
1103 info->fix.mmio_start = 0;
1104 info->fix.mmio_len = 0;
1105 info->fix.type_aux = 0;
1106 info->fix.xpanstep = 1; /* doing it in hw */
1107 info->fix.ypanstep = 1; /* doing it in hw */
1108 info->fix.ywrapstep = 0;
1109 info->fix.accel = FB_ACCEL_NONE;
1110 info->fix.type_aux = 0;
1111
1112 info->fix.line_length = pitch;
1113 return;
1114 }
1115 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1116
1117 /**
1118 * drm_fb_helper_fill_var - initalizes variable fbdev information
1119 * @info: fbdev instance to set up
1120 * @fb_helper: fb helper instance to use as template
1121 * @fb_width: desired fb width
1122 * @fb_height: desired fb height
1123 *
1124 * Sets up the variable fbdev metainformation from the given fb helper instance
1125 * and the drm framebuffer allocated in fb_helper->fb.
1126 *
1127 * Drivers should call this (or their equivalent setup code) from their
1128 * ->fb_probe callback after having allocated the fbdev backing
1129 * storage framebuffer.
1130 */
1131 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1132 uint32_t fb_width, uint32_t fb_height)
1133 {
1134 struct drm_framebuffer *fb = fb_helper->fb;
1135 info->pseudo_palette = fb_helper->pseudo_palette;
1136 info->var.xres_virtual = fb->width;
1137 info->var.yres_virtual = fb->height;
1138 info->var.bits_per_pixel = fb->bits_per_pixel;
1139 info->var.accel_flags = FB_ACCELF_TEXT;
1140 info->var.xoffset = 0;
1141 info->var.yoffset = 0;
1142 info->var.activate = FB_ACTIVATE_NOW;
1143 info->var.height = -1;
1144 info->var.width = -1;
1145
1146 switch (fb->depth) {
1147 case 8:
1148 info->var.red.offset = 0;
1149 info->var.green.offset = 0;
1150 info->var.blue.offset = 0;
1151 info->var.red.length = 8; /* 8bit DAC */
1152 info->var.green.length = 8;
1153 info->var.blue.length = 8;
1154 info->var.transp.offset = 0;
1155 info->var.transp.length = 0;
1156 break;
1157 case 15:
1158 info->var.red.offset = 10;
1159 info->var.green.offset = 5;
1160 info->var.blue.offset = 0;
1161 info->var.red.length = 5;
1162 info->var.green.length = 5;
1163 info->var.blue.length = 5;
1164 info->var.transp.offset = 15;
1165 info->var.transp.length = 1;
1166 break;
1167 case 16:
1168 info->var.red.offset = 11;
1169 info->var.green.offset = 5;
1170 info->var.blue.offset = 0;
1171 info->var.red.length = 5;
1172 info->var.green.length = 6;
1173 info->var.blue.length = 5;
1174 info->var.transp.offset = 0;
1175 break;
1176 case 24:
1177 info->var.red.offset = 16;
1178 info->var.green.offset = 8;
1179 info->var.blue.offset = 0;
1180 info->var.red.length = 8;
1181 info->var.green.length = 8;
1182 info->var.blue.length = 8;
1183 info->var.transp.offset = 0;
1184 info->var.transp.length = 0;
1185 break;
1186 case 32:
1187 info->var.red.offset = 16;
1188 info->var.green.offset = 8;
1189 info->var.blue.offset = 0;
1190 info->var.red.length = 8;
1191 info->var.green.length = 8;
1192 info->var.blue.length = 8;
1193 info->var.transp.offset = 24;
1194 info->var.transp.length = 8;
1195 break;
1196 default:
1197 break;
1198 }
1199
1200 info->var.xres = fb_width;
1201 info->var.yres = fb_height;
1202 }
1203 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1204 #endif
1205
1206 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1207 uint32_t maxX,
1208 uint32_t maxY)
1209 {
1210 struct drm_connector *connector;
1211 int count = 0;
1212 int i;
1213
1214 for (i = 0; i < fb_helper->connector_count; i++) {
1215 connector = fb_helper->connector_info[i]->connector;
1216 count += connector->funcs->fill_modes(connector, maxX, maxY);
1217 }
1218
1219 return count;
1220 }
1221
1222 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1223 {
1224 struct drm_display_mode *mode;
1225
1226 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1227 if (mode->hdisplay > width ||
1228 mode->vdisplay > height)
1229 continue;
1230 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1231 return mode;
1232 }
1233 return NULL;
1234 }
1235 EXPORT_SYMBOL(drm_has_preferred_mode);
1236
1237 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1238 {
1239 struct drm_cmdline_mode *cmdline_mode;
1240 cmdline_mode = &fb_connector->cmdline_mode;
1241 return cmdline_mode->specified;
1242 }
1243
1244 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1245 int width, int height)
1246 {
1247 struct drm_cmdline_mode *cmdline_mode;
1248 struct drm_display_mode *mode = NULL;
1249 bool prefer_non_interlace;
1250
1251 cmdline_mode = &fb_helper_conn->cmdline_mode;
1252 if (cmdline_mode->specified == false)
1253 return mode;
1254
1255 /* attempt to find a matching mode in the list of modes
1256 * we have gotten so far, if not add a CVT mode that conforms
1257 */
1258 if (cmdline_mode->rb || cmdline_mode->margins)
1259 goto create_mode;
1260
1261 prefer_non_interlace = !cmdline_mode->interlace;
1262 again:
1263 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1264 /* check width/height */
1265 if (mode->hdisplay != cmdline_mode->xres ||
1266 mode->vdisplay != cmdline_mode->yres)
1267 continue;
1268
1269 if (cmdline_mode->refresh_specified) {
1270 if (mode->vrefresh != cmdline_mode->refresh)
1271 continue;
1272 }
1273
1274 if (cmdline_mode->interlace) {
1275 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1276 continue;
1277 } else if (prefer_non_interlace) {
1278 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1279 continue;
1280 }
1281 return mode;
1282 }
1283
1284 if (prefer_non_interlace) {
1285 prefer_non_interlace = false;
1286 goto again;
1287 }
1288
1289 create_mode:
1290 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1291 cmdline_mode);
1292 list_add(&mode->head, &fb_helper_conn->connector->modes);
1293 return mode;
1294 }
1295 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1296
1297 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1298 {
1299 bool enable;
1300
1301 if (strict)
1302 enable = connector->status == connector_status_connected;
1303 else
1304 enable = connector->status != connector_status_disconnected;
1305
1306 return enable;
1307 }
1308
1309 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1310 bool *enabled)
1311 {
1312 bool any_enabled = false;
1313 struct drm_connector *connector;
1314 int i = 0;
1315
1316 for (i = 0; i < fb_helper->connector_count; i++) {
1317 connector = fb_helper->connector_info[i]->connector;
1318 enabled[i] = drm_connector_enabled(connector, true);
1319 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1320 enabled[i] ? "yes" : "no");
1321 any_enabled |= enabled[i];
1322 }
1323
1324 if (any_enabled)
1325 return;
1326
1327 for (i = 0; i < fb_helper->connector_count; i++) {
1328 connector = fb_helper->connector_info[i]->connector;
1329 enabled[i] = drm_connector_enabled(connector, false);
1330 }
1331 }
1332
1333 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1334 struct drm_display_mode **modes,
1335 bool *enabled, int width, int height)
1336 {
1337 int count, i, j;
1338 bool can_clone = false;
1339 struct drm_fb_helper_connector *fb_helper_conn;
1340 struct drm_display_mode *dmt_mode, *mode;
1341
1342 /* only contemplate cloning in the single crtc case */
1343 if (fb_helper->crtc_count > 1)
1344 return false;
1345
1346 count = 0;
1347 for (i = 0; i < fb_helper->connector_count; i++) {
1348 if (enabled[i])
1349 count++;
1350 }
1351
1352 /* only contemplate cloning if more than one connector is enabled */
1353 if (count <= 1)
1354 return false;
1355
1356 /* check the command line or if nothing common pick 1024x768 */
1357 can_clone = true;
1358 for (i = 0; i < fb_helper->connector_count; i++) {
1359 if (!enabled[i])
1360 continue;
1361 fb_helper_conn = fb_helper->connector_info[i];
1362 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1363 if (!modes[i]) {
1364 can_clone = false;
1365 break;
1366 }
1367 for (j = 0; j < i; j++) {
1368 if (!enabled[j])
1369 continue;
1370 if (!drm_mode_equal(modes[j], modes[i]))
1371 can_clone = false;
1372 }
1373 }
1374
1375 if (can_clone) {
1376 DRM_DEBUG_KMS("can clone using command line\n");
1377 return true;
1378 }
1379
1380 /* try and find a 1024x768 mode on each connector */
1381 can_clone = true;
1382 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1383
1384 for (i = 0; i < fb_helper->connector_count; i++) {
1385
1386 if (!enabled[i])
1387 continue;
1388
1389 fb_helper_conn = fb_helper->connector_info[i];
1390 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1391 if (drm_mode_equal(mode, dmt_mode))
1392 modes[i] = mode;
1393 }
1394 if (!modes[i])
1395 can_clone = false;
1396 }
1397
1398 if (can_clone) {
1399 DRM_DEBUG_KMS("can clone using 1024x768\n");
1400 return true;
1401 }
1402 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1403 return false;
1404 }
1405
1406 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1407 struct drm_display_mode **modes,
1408 bool *enabled, int width, int height)
1409 {
1410 struct drm_fb_helper_connector *fb_helper_conn;
1411 int i;
1412
1413 for (i = 0; i < fb_helper->connector_count; i++) {
1414 fb_helper_conn = fb_helper->connector_info[i];
1415
1416 if (enabled[i] == false)
1417 continue;
1418
1419 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1420 fb_helper_conn->connector->base.id);
1421
1422 /* got for command line mode first */
1423 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1424 if (!modes[i]) {
1425 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1426 fb_helper_conn->connector->base.id);
1427 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1428 }
1429 /* No preferred modes, pick one off the list */
1430 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1431 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1432 break;
1433 }
1434 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1435 "none");
1436 }
1437 return true;
1438 }
1439
1440 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1441 struct drm_fb_helper_crtc **best_crtcs,
1442 struct drm_display_mode **modes,
1443 int n, int width, int height)
1444 {
1445 int c, o;
1446 struct drm_device *dev = fb_helper->dev;
1447 struct drm_connector *connector;
1448 struct drm_connector_helper_funcs *connector_funcs;
1449 struct drm_encoder *encoder;
1450 int my_score, best_score, score;
1451 struct drm_fb_helper_crtc **crtcs, *crtc;
1452 struct drm_fb_helper_connector *fb_helper_conn;
1453
1454 if (n == fb_helper->connector_count)
1455 return 0;
1456
1457 fb_helper_conn = fb_helper->connector_info[n];
1458 connector = fb_helper_conn->connector;
1459
1460 best_crtcs[n] = NULL;
1461 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1462 if (modes[n] == NULL)
1463 return best_score;
1464
1465 crtcs = kzalloc(dev->mode_config.num_connector *
1466 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1467 if (!crtcs)
1468 return best_score;
1469
1470 my_score = 1;
1471 if (connector->status == connector_status_connected)
1472 my_score++;
1473 if (drm_has_cmdline_mode(fb_helper_conn))
1474 my_score++;
1475 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1476 my_score++;
1477
1478 connector_funcs = connector->helper_private;
1479 encoder = connector_funcs->best_encoder(connector);
1480 if (!encoder)
1481 goto out;
1482
1483 /* select a crtc for this connector and then attempt to configure
1484 remaining connectors */
1485 for (c = 0; c < fb_helper->crtc_count; c++) {
1486 crtc = &fb_helper->crtc_info[c];
1487
1488 if ((encoder->possible_crtcs & (1 << c)) == 0)
1489 continue;
1490
1491 for (o = 0; o < n; o++)
1492 if (best_crtcs[o] == crtc)
1493 break;
1494
1495 if (o < n) {
1496 /* ignore cloning unless only a single crtc */
1497 if (fb_helper->crtc_count > 1)
1498 continue;
1499
1500 if (!drm_mode_equal(modes[o], modes[n]))
1501 continue;
1502 }
1503
1504 crtcs[n] = crtc;
1505 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1506 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1507 width, height);
1508 if (score > best_score) {
1509 best_score = score;
1510 memcpy(best_crtcs, crtcs,
1511 dev->mode_config.num_connector *
1512 sizeof(struct drm_fb_helper_crtc *));
1513 }
1514 }
1515 out:
1516 kfree(crtcs);
1517 return best_score;
1518 }
1519
1520 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1521 {
1522 struct drm_device *dev = fb_helper->dev;
1523 struct drm_fb_helper_crtc **crtcs;
1524 struct drm_display_mode **modes;
1525 struct drm_mode_set *modeset;
1526 bool *enabled;
1527 int width, height;
1528 int i;
1529
1530 DRM_DEBUG_KMS("\n");
1531
1532 width = dev->mode_config.max_width;
1533 height = dev->mode_config.max_height;
1534
1535 crtcs = kcalloc(dev->mode_config.num_connector,
1536 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1537 modes = kcalloc(dev->mode_config.num_connector,
1538 sizeof(struct drm_display_mode *), GFP_KERNEL);
1539 enabled = kcalloc(dev->mode_config.num_connector,
1540 sizeof(bool), GFP_KERNEL);
1541 if (!crtcs || !modes || !enabled) {
1542 DRM_ERROR("Memory allocation failed\n");
1543 goto out;
1544 }
1545
1546
1547 drm_enable_connectors(fb_helper, enabled);
1548
1549 if (!(fb_helper->funcs->initial_config &&
1550 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1551 enabled, width, height))) {
1552 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1553 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1554
1555 if (!drm_target_cloned(fb_helper,
1556 modes, enabled, width, height) &&
1557 !drm_target_preferred(fb_helper,
1558 modes, enabled, width, height))
1559 DRM_ERROR("Unable to find initial modes\n");
1560
1561 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1562 width, height);
1563
1564 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1565 }
1566
1567 /* need to set the modesets up here for use later */
1568 /* fill out the connector<->crtc mappings into the modesets */
1569 for (i = 0; i < fb_helper->crtc_count; i++) {
1570 modeset = &fb_helper->crtc_info[i].mode_set;
1571 modeset->num_connectors = 0;
1572 modeset->fb = NULL;
1573 }
1574
1575 for (i = 0; i < fb_helper->connector_count; i++) {
1576 struct drm_display_mode *mode = modes[i];
1577 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1578 modeset = &fb_crtc->mode_set;
1579
1580 if (mode && fb_crtc) {
1581 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1582 mode->name, fb_crtc->mode_set.crtc->base.id);
1583 fb_crtc->desired_mode = mode;
1584 if (modeset->mode)
1585 drm_mode_destroy(dev, modeset->mode);
1586 modeset->mode = drm_mode_duplicate(dev,
1587 fb_crtc->desired_mode);
1588 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1589 modeset->fb = fb_helper->fb;
1590 }
1591 }
1592
1593 /* Clear out any old modes if there are no more connected outputs. */
1594 for (i = 0; i < fb_helper->crtc_count; i++) {
1595 modeset = &fb_helper->crtc_info[i].mode_set;
1596 if (modeset->num_connectors == 0) {
1597 BUG_ON(modeset->fb);
1598 BUG_ON(modeset->num_connectors);
1599 if (modeset->mode)
1600 drm_mode_destroy(dev, modeset->mode);
1601 modeset->mode = NULL;
1602 }
1603 }
1604 out:
1605 kfree(crtcs);
1606 kfree(modes);
1607 kfree(enabled);
1608 }
1609
1610 /**
1611 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1612 * @fb_helper: fb_helper device struct
1613 * @bpp_sel: bpp value to use for the framebuffer configuration
1614 *
1615 * Scans the CRTCs and connectors and tries to put together an initial setup.
1616 * At the moment, this is a cloned configuration across all heads with
1617 * a new framebuffer object as the backing store.
1618 *
1619 * Note that this also registers the fbdev and so allows userspace to call into
1620 * the driver through the fbdev interfaces.
1621 *
1622 * This function will call down into the ->fb_probe callback to let
1623 * the driver allocate and initialize the fbdev info structure and the drm
1624 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1625 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1626 * values for the fbdev info structure.
1627 *
1628 * RETURNS:
1629 * Zero if everything went ok, nonzero otherwise.
1630 */
1631 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1632 {
1633 struct drm_device *dev = fb_helper->dev;
1634 int count = 0;
1635
1636 drm_fb_helper_parse_command_line(fb_helper);
1637
1638 mutex_lock(&dev->mode_config.mutex);
1639 count = drm_fb_helper_probe_connector_modes(fb_helper,
1640 dev->mode_config.max_width,
1641 dev->mode_config.max_height);
1642 mutex_unlock(&dev->mode_config.mutex);
1643 /*
1644 * we shouldn't end up with no modes here.
1645 */
1646 if (count == 0)
1647 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1648
1649 drm_setup_crtcs(fb_helper);
1650
1651 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1652 }
1653 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1654
1655 /**
1656 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1657 * probing all the outputs attached to the fb
1658 * @fb_helper: the drm_fb_helper
1659 *
1660 * Scan the connectors attached to the fb_helper and try to put together a
1661 * setup after *notification of a change in output configuration.
1662 *
1663 * Called at runtime, takes the mode config locks to be able to check/change the
1664 * modeset configuration. Must be run from process context (which usually means
1665 * either the output polling work or a work item launched from the driver's
1666 * hotplug interrupt).
1667 *
1668 * Note that the driver must ensure that this is only called _after_ the fb has
1669 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1670 *
1671 * RETURNS:
1672 * 0 on success and a non-zero error code otherwise.
1673 */
1674 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1675 {
1676 struct drm_device *dev = fb_helper->dev;
1677 u32 max_width, max_height;
1678
1679 if (!fb_helper->fb)
1680 return 0;
1681
1682 mutex_lock(&fb_helper->dev->mode_config.mutex);
1683 if (!drm_fb_helper_is_bound(fb_helper)) {
1684 fb_helper->delayed_hotplug = true;
1685 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1686 return 0;
1687 }
1688 DRM_DEBUG_KMS("\n");
1689
1690 max_width = fb_helper->fb->width;
1691 max_height = fb_helper->fb->height;
1692
1693 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1694 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1695
1696 drm_modeset_lock_all(dev);
1697 drm_setup_crtcs(fb_helper);
1698 drm_modeset_unlock_all(dev);
1699 #if 0
1700 drm_fb_helper_set_par(fb_helper->fbdev);
1701 #endif
1702
1703 return 0;
1704 }
1705 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1706
1707 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1708 * but the module doesn't depend on any fb console symbols. At least
1709 * attempt to load fbcon to avoid leaving the system without a usable console.
1710 */
1711 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1712 static int __init drm_fb_helper_modinit(void)
1713 {
1714 const char *name = "fbcon";
1715 struct module *fbcon;
1716
1717 mutex_lock(&module_mutex);
1718 fbcon = find_module(name);
1719 mutex_unlock(&module_mutex);
1720
1721 if (!fbcon)
1722 request_module_nowait(name);
1723 return 0;
1724 }
1725
1726 module_init(drm_fb_helper_modinit);
1727 #endif
DragonFly BSD