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drm/fb-helper: Don't clobber the display palette when fbdev isn't bound
[deliverable/linux.git] / drivers / gpu / drm / drm_fb_helper.c
1 /*
2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 *
6 * DRM framebuffer helper functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
35 #include <linux/fb.h>
36 #include <linux/module.h>
37 #include <drm/drmP.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
41
42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
43 MODULE_DESCRIPTION("DRM KMS helper");
44 MODULE_LICENSE("GPL and additional rights");
45
46 static LIST_HEAD(kernel_fb_helper_list);
47
48 /**
49 * DOC: fbdev helpers
50 *
51 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
52 * mode setting driver. They can be used mostly independantely from the crtc
53 * helper functions used by many drivers to implement the kernel mode setting
54 * interfaces.
55 *
56 * Initialization is done as a three-step process with drm_fb_helper_init(),
57 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
58 * Drivers with fancier requirements than the default beheviour can override the
59 * second step with their own code. Teardown is done with drm_fb_helper_fini().
60 *
61 * At runtime drivers should restore the fbdev console by calling
62 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
63 * should also notify the fb helper code from updates to the output
64 * configuration by calling drm_fb_helper_hotplug_event(). For easier
65 * integration with the output polling code in drm_crtc_helper.c the modeset
66 * code proves a ->output_poll_changed callback.
67 *
68 * All other functions exported by the fb helper library can be used to
69 * implement the fbdev driver interface by the driver.
70 */
71
72 /**
73 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
74 * emulation helper
75 * @fb_helper: fbdev initialized with drm_fb_helper_init
76 *
77 * This functions adds all the available connectors for use with the given
78 * fb_helper. This is a separate step to allow drivers to freely assign
79 * connectors to the fbdev, e.g. if some are reserved for special purposes or
80 * not adequate to be used for the fbcon.
81 *
82 * Since this is part of the initial setup before the fbdev is published, no
83 * locking is required.
84 */
85 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
86 {
87 struct drm_device *dev = fb_helper->dev;
88 struct drm_connector *connector;
89 int i;
90
91 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
92 struct drm_fb_helper_connector *fb_helper_connector;
93
94 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
95 if (!fb_helper_connector)
96 goto fail;
97
98 fb_helper_connector->connector = connector;
99 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
100 }
101 return 0;
102 fail:
103 for (i = 0; i < fb_helper->connector_count; i++) {
104 kfree(fb_helper->connector_info[i]);
105 fb_helper->connector_info[i] = NULL;
106 }
107 fb_helper->connector_count = 0;
108 return -ENOMEM;
109 }
110 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
111
112 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
113 {
114 struct drm_fb_helper_connector *fb_helper_conn;
115 int i;
116
117 for (i = 0; i < fb_helper->connector_count; i++) {
118 struct drm_cmdline_mode *mode;
119 struct drm_connector *connector;
120 char *option = NULL;
121
122 fb_helper_conn = fb_helper->connector_info[i];
123 connector = fb_helper_conn->connector;
124 mode = &fb_helper_conn->cmdline_mode;
125
126 /* do something on return - turn off connector maybe */
127 if (fb_get_options(drm_get_connector_name(connector), &option))
128 continue;
129
130 if (drm_mode_parse_command_line_for_connector(option,
131 connector,
132 mode)) {
133 if (mode->force) {
134 const char *s;
135 switch (mode->force) {
136 case DRM_FORCE_OFF:
137 s = "OFF";
138 break;
139 case DRM_FORCE_ON_DIGITAL:
140 s = "ON - dig";
141 break;
142 default:
143 case DRM_FORCE_ON:
144 s = "ON";
145 break;
146 }
147
148 DRM_INFO("forcing %s connector %s\n",
149 drm_get_connector_name(connector), s);
150 connector->force = mode->force;
151 }
152
153 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
154 drm_get_connector_name(connector),
155 mode->xres, mode->yres,
156 mode->refresh_specified ? mode->refresh : 60,
157 mode->rb ? " reduced blanking" : "",
158 mode->margins ? " with margins" : "",
159 mode->interlace ? " interlaced" : "");
160 }
161
162 }
163 return 0;
164 }
165
166 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
167 {
168 uint16_t *r_base, *g_base, *b_base;
169 int i;
170
171 r_base = crtc->gamma_store;
172 g_base = r_base + crtc->gamma_size;
173 b_base = g_base + crtc->gamma_size;
174
175 for (i = 0; i < crtc->gamma_size; i++)
176 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
177 }
178
179 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
180 {
181 uint16_t *r_base, *g_base, *b_base;
182
183 if (crtc->funcs->gamma_set == NULL)
184 return;
185
186 r_base = crtc->gamma_store;
187 g_base = r_base + crtc->gamma_size;
188 b_base = g_base + crtc->gamma_size;
189
190 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
191 }
192
193 /**
194 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
195 * @info: fbdev registered by the helper
196 */
197 int drm_fb_helper_debug_enter(struct fb_info *info)
198 {
199 struct drm_fb_helper *helper = info->par;
200 struct drm_crtc_helper_funcs *funcs;
201 int i;
202
203 if (list_empty(&kernel_fb_helper_list))
204 return false;
205
206 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
207 for (i = 0; i < helper->crtc_count; i++) {
208 struct drm_mode_set *mode_set =
209 &helper->crtc_info[i].mode_set;
210
211 if (!mode_set->crtc->enabled)
212 continue;
213
214 funcs = mode_set->crtc->helper_private;
215 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
216 funcs->mode_set_base_atomic(mode_set->crtc,
217 mode_set->fb,
218 mode_set->x,
219 mode_set->y,
220 ENTER_ATOMIC_MODE_SET);
221 }
222 }
223
224 return 0;
225 }
226 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
227
228 /* Find the real fb for a given fb helper CRTC */
229 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
230 {
231 struct drm_device *dev = crtc->dev;
232 struct drm_crtc *c;
233
234 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
235 if (crtc->base.id == c->base.id)
236 return c->fb;
237 }
238
239 return NULL;
240 }
241
242 /**
243 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
244 * @info: fbdev registered by the helper
245 */
246 int drm_fb_helper_debug_leave(struct fb_info *info)
247 {
248 struct drm_fb_helper *helper = info->par;
249 struct drm_crtc *crtc;
250 struct drm_crtc_helper_funcs *funcs;
251 struct drm_framebuffer *fb;
252 int i;
253
254 for (i = 0; i < helper->crtc_count; i++) {
255 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
256 crtc = mode_set->crtc;
257 funcs = crtc->helper_private;
258 fb = drm_mode_config_fb(crtc);
259
260 if (!crtc->enabled)
261 continue;
262
263 if (!fb) {
264 DRM_ERROR("no fb to restore??\n");
265 continue;
266 }
267
268 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
269 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
270 crtc->y, LEAVE_ATOMIC_MODE_SET);
271 }
272
273 return 0;
274 }
275 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
276
277 /**
278 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
279 * @fb_helper: fbcon to restore
280 *
281 * This should be called from driver's drm ->lastclose callback
282 * when implementing an fbcon on top of kms using this helper. This ensures that
283 * the user isn't greeted with a black screen when e.g. X dies.
284 */
285 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
286 {
287 struct drm_device *dev = fb_helper->dev;
288 struct drm_plane *plane;
289 bool error = false;
290 int i;
291
292 drm_warn_on_modeset_not_all_locked(dev);
293
294 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
295 drm_plane_force_disable(plane);
296
297 for (i = 0; i < fb_helper->crtc_count; i++) {
298 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
299 struct drm_crtc *crtc = mode_set->crtc;
300 int ret;
301
302 if (crtc->funcs->cursor_set) {
303 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
304 if (ret)
305 error = true;
306 }
307
308 ret = drm_mode_set_config_internal(mode_set);
309 if (ret)
310 error = true;
311 }
312 return error;
313 }
314 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
315
316 /*
317 * restore fbcon display for all kms driver's using this helper, used for sysrq
318 * and panic handling.
319 */
320 static bool drm_fb_helper_force_kernel_mode(void)
321 {
322 bool ret, error = false;
323 struct drm_fb_helper *helper;
324
325 if (list_empty(&kernel_fb_helper_list))
326 return false;
327
328 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
329 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
330 continue;
331
332 ret = drm_fb_helper_restore_fbdev_mode(helper);
333 if (ret)
334 error = true;
335 }
336 return error;
337 }
338
339 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
340 void *panic_str)
341 {
342 /*
343 * It's a waste of time and effort to switch back to text console
344 * if the kernel should reboot before panic messages can be seen.
345 */
346 if (panic_timeout < 0)
347 return 0;
348
349 pr_err("panic occurred, switching back to text console\n");
350 return drm_fb_helper_force_kernel_mode();
351 }
352
353 static struct notifier_block paniced = {
354 .notifier_call = drm_fb_helper_panic,
355 };
356
357 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
358 {
359 struct drm_device *dev = fb_helper->dev;
360 struct drm_crtc *crtc;
361 int bound = 0, crtcs_bound = 0;
362
363 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
364 if (crtc->fb)
365 crtcs_bound++;
366 if (crtc->fb == fb_helper->fb)
367 bound++;
368 }
369
370 if (bound < crtcs_bound)
371 return false;
372 return true;
373 }
374
375 #ifdef CONFIG_MAGIC_SYSRQ
376 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
377 {
378 bool ret;
379 ret = drm_fb_helper_force_kernel_mode();
380 if (ret == true)
381 DRM_ERROR("Failed to restore crtc configuration\n");
382 }
383 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
384
385 static void drm_fb_helper_sysrq(int dummy1)
386 {
387 schedule_work(&drm_fb_helper_restore_work);
388 }
389
390 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
391 .handler = drm_fb_helper_sysrq,
392 .help_msg = "force-fb(V)",
393 .action_msg = "Restore framebuffer console",
394 };
395 #else
396 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
397 #endif
398
399 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
400 {
401 struct drm_fb_helper *fb_helper = info->par;
402 struct drm_device *dev = fb_helper->dev;
403 struct drm_crtc *crtc;
404 struct drm_connector *connector;
405 int i, j;
406
407 /*
408 * fbdev->blank can be called from irq context in case of a panic.
409 * Since we already have our own special panic handler which will
410 * restore the fbdev console mode completely, just bail out early.
411 */
412 if (oops_in_progress)
413 return;
414
415 /*
416 * For each CRTC in this fb, turn the connectors on/off.
417 */
418 drm_modeset_lock_all(dev);
419 if (!drm_fb_helper_is_bound(fb_helper)) {
420 drm_modeset_unlock_all(dev);
421 return;
422 }
423
424 for (i = 0; i < fb_helper->crtc_count; i++) {
425 crtc = fb_helper->crtc_info[i].mode_set.crtc;
426
427 if (!crtc->enabled)
428 continue;
429
430 /* Walk the connectors & encoders on this fb turning them on/off */
431 for (j = 0; j < fb_helper->connector_count; j++) {
432 connector = fb_helper->connector_info[j]->connector;
433 connector->funcs->dpms(connector, dpms_mode);
434 drm_object_property_set_value(&connector->base,
435 dev->mode_config.dpms_property, dpms_mode);
436 }
437 }
438 drm_modeset_unlock_all(dev);
439 }
440
441 /**
442 * drm_fb_helper_blank - implementation for ->fb_blank
443 * @blank: desired blanking state
444 * @info: fbdev registered by the helper
445 */
446 int drm_fb_helper_blank(int blank, struct fb_info *info)
447 {
448 switch (blank) {
449 /* Display: On; HSync: On, VSync: On */
450 case FB_BLANK_UNBLANK:
451 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
452 break;
453 /* Display: Off; HSync: On, VSync: On */
454 case FB_BLANK_NORMAL:
455 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
456 break;
457 /* Display: Off; HSync: Off, VSync: On */
458 case FB_BLANK_HSYNC_SUSPEND:
459 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
460 break;
461 /* Display: Off; HSync: On, VSync: Off */
462 case FB_BLANK_VSYNC_SUSPEND:
463 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
464 break;
465 /* Display: Off; HSync: Off, VSync: Off */
466 case FB_BLANK_POWERDOWN:
467 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
468 break;
469 }
470 return 0;
471 }
472 EXPORT_SYMBOL(drm_fb_helper_blank);
473
474 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
475 {
476 int i;
477
478 for (i = 0; i < helper->connector_count; i++)
479 kfree(helper->connector_info[i]);
480 kfree(helper->connector_info);
481 for (i = 0; i < helper->crtc_count; i++) {
482 kfree(helper->crtc_info[i].mode_set.connectors);
483 if (helper->crtc_info[i].mode_set.mode)
484 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
485 }
486 kfree(helper->crtc_info);
487 }
488
489 /**
490 * drm_fb_helper_init - initialize a drm_fb_helper structure
491 * @dev: drm device
492 * @fb_helper: driver-allocated fbdev helper structure to initialize
493 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
494 * @max_conn_count: max connector count
495 *
496 * This allocates the structures for the fbdev helper with the given limits.
497 * Note that this won't yet touch the hardware (through the driver interfaces)
498 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
499 * to allow driver writes more control over the exact init sequence.
500 *
501 * Drivers must set fb_helper->funcs before calling
502 * drm_fb_helper_initial_config().
503 *
504 * RETURNS:
505 * Zero if everything went ok, nonzero otherwise.
506 */
507 int drm_fb_helper_init(struct drm_device *dev,
508 struct drm_fb_helper *fb_helper,
509 int crtc_count, int max_conn_count)
510 {
511 struct drm_crtc *crtc;
512 int i;
513
514 fb_helper->dev = dev;
515
516 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
517
518 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
519 if (!fb_helper->crtc_info)
520 return -ENOMEM;
521
522 fb_helper->crtc_count = crtc_count;
523 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
524 if (!fb_helper->connector_info) {
525 kfree(fb_helper->crtc_info);
526 return -ENOMEM;
527 }
528 fb_helper->connector_count = 0;
529
530 for (i = 0; i < crtc_count; i++) {
531 fb_helper->crtc_info[i].mode_set.connectors =
532 kcalloc(max_conn_count,
533 sizeof(struct drm_connector *),
534 GFP_KERNEL);
535
536 if (!fb_helper->crtc_info[i].mode_set.connectors)
537 goto out_free;
538 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
539 }
540
541 i = 0;
542 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
543 fb_helper->crtc_info[i].mode_set.crtc = crtc;
544 i++;
545 }
546
547 return 0;
548 out_free:
549 drm_fb_helper_crtc_free(fb_helper);
550 return -ENOMEM;
551 }
552 EXPORT_SYMBOL(drm_fb_helper_init);
553
554 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
555 {
556 if (!list_empty(&fb_helper->kernel_fb_list)) {
557 list_del(&fb_helper->kernel_fb_list);
558 if (list_empty(&kernel_fb_helper_list)) {
559 pr_info("drm: unregistered panic notifier\n");
560 atomic_notifier_chain_unregister(&panic_notifier_list,
561 &paniced);
562 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
563 }
564 }
565
566 drm_fb_helper_crtc_free(fb_helper);
567
568 }
569 EXPORT_SYMBOL(drm_fb_helper_fini);
570
571 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
572 u16 blue, u16 regno, struct fb_info *info)
573 {
574 struct drm_fb_helper *fb_helper = info->par;
575 struct drm_framebuffer *fb = fb_helper->fb;
576 int pindex;
577
578 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
579 u32 *palette;
580 u32 value;
581 /* place color in psuedopalette */
582 if (regno > 16)
583 return -EINVAL;
584 palette = (u32 *)info->pseudo_palette;
585 red >>= (16 - info->var.red.length);
586 green >>= (16 - info->var.green.length);
587 blue >>= (16 - info->var.blue.length);
588 value = (red << info->var.red.offset) |
589 (green << info->var.green.offset) |
590 (blue << info->var.blue.offset);
591 if (info->var.transp.length > 0) {
592 u32 mask = (1 << info->var.transp.length) - 1;
593 mask <<= info->var.transp.offset;
594 value |= mask;
595 }
596 palette[regno] = value;
597 return 0;
598 }
599
600 pindex = regno;
601
602 if (fb->bits_per_pixel == 16) {
603 pindex = regno << 3;
604
605 if (fb->depth == 16 && regno > 63)
606 return -EINVAL;
607 if (fb->depth == 15 && regno > 31)
608 return -EINVAL;
609
610 if (fb->depth == 16) {
611 u16 r, g, b;
612 int i;
613 if (regno < 32) {
614 for (i = 0; i < 8; i++)
615 fb_helper->funcs->gamma_set(crtc, red,
616 green, blue, pindex + i);
617 }
618
619 fb_helper->funcs->gamma_get(crtc, &r,
620 &g, &b,
621 pindex >> 1);
622
623 for (i = 0; i < 4; i++)
624 fb_helper->funcs->gamma_set(crtc, r,
625 green, b,
626 (pindex >> 1) + i);
627 }
628 }
629
630 if (fb->depth != 16)
631 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
632 return 0;
633 }
634
635 /**
636 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
637 * @cmap: cmap to set
638 * @info: fbdev registered by the helper
639 */
640 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
641 {
642 struct drm_fb_helper *fb_helper = info->par;
643 struct drm_device *dev = fb_helper->dev;
644 struct drm_crtc_helper_funcs *crtc_funcs;
645 u16 *red, *green, *blue, *transp;
646 struct drm_crtc *crtc;
647 int i, j, rc = 0;
648 int start;
649
650 drm_modeset_lock_all(dev);
651 if (!drm_fb_helper_is_bound(fb_helper)) {
652 drm_modeset_unlock_all(dev);
653 return -EBUSY;
654 }
655
656 for (i = 0; i < fb_helper->crtc_count; i++) {
657 crtc = fb_helper->crtc_info[i].mode_set.crtc;
658 crtc_funcs = crtc->helper_private;
659
660 red = cmap->red;
661 green = cmap->green;
662 blue = cmap->blue;
663 transp = cmap->transp;
664 start = cmap->start;
665
666 for (j = 0; j < cmap->len; j++) {
667 u16 hred, hgreen, hblue, htransp = 0xffff;
668
669 hred = *red++;
670 hgreen = *green++;
671 hblue = *blue++;
672
673 if (transp)
674 htransp = *transp++;
675
676 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
677 if (rc)
678 goto out;
679 }
680 crtc_funcs->load_lut(crtc);
681 }
682 out:
683 drm_modeset_unlock_all(dev);
684 return rc;
685 }
686 EXPORT_SYMBOL(drm_fb_helper_setcmap);
687
688 /**
689 * drm_fb_helper_check_var - implementation for ->fb_check_var
690 * @var: screeninfo to check
691 * @info: fbdev registered by the helper
692 */
693 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
694 struct fb_info *info)
695 {
696 struct drm_fb_helper *fb_helper = info->par;
697 struct drm_framebuffer *fb = fb_helper->fb;
698 int depth;
699
700 if (var->pixclock != 0 || in_dbg_master())
701 return -EINVAL;
702
703 /* Need to resize the fb object !!! */
704 if (var->bits_per_pixel > fb->bits_per_pixel ||
705 var->xres > fb->width || var->yres > fb->height ||
706 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
707 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
708 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
709 var->xres, var->yres, var->bits_per_pixel,
710 var->xres_virtual, var->yres_virtual,
711 fb->width, fb->height, fb->bits_per_pixel);
712 return -EINVAL;
713 }
714
715 switch (var->bits_per_pixel) {
716 case 16:
717 depth = (var->green.length == 6) ? 16 : 15;
718 break;
719 case 32:
720 depth = (var->transp.length > 0) ? 32 : 24;
721 break;
722 default:
723 depth = var->bits_per_pixel;
724 break;
725 }
726
727 switch (depth) {
728 case 8:
729 var->red.offset = 0;
730 var->green.offset = 0;
731 var->blue.offset = 0;
732 var->red.length = 8;
733 var->green.length = 8;
734 var->blue.length = 8;
735 var->transp.length = 0;
736 var->transp.offset = 0;
737 break;
738 case 15:
739 var->red.offset = 10;
740 var->green.offset = 5;
741 var->blue.offset = 0;
742 var->red.length = 5;
743 var->green.length = 5;
744 var->blue.length = 5;
745 var->transp.length = 1;
746 var->transp.offset = 15;
747 break;
748 case 16:
749 var->red.offset = 11;
750 var->green.offset = 5;
751 var->blue.offset = 0;
752 var->red.length = 5;
753 var->green.length = 6;
754 var->blue.length = 5;
755 var->transp.length = 0;
756 var->transp.offset = 0;
757 break;
758 case 24:
759 var->red.offset = 16;
760 var->green.offset = 8;
761 var->blue.offset = 0;
762 var->red.length = 8;
763 var->green.length = 8;
764 var->blue.length = 8;
765 var->transp.length = 0;
766 var->transp.offset = 0;
767 break;
768 case 32:
769 var->red.offset = 16;
770 var->green.offset = 8;
771 var->blue.offset = 0;
772 var->red.length = 8;
773 var->green.length = 8;
774 var->blue.length = 8;
775 var->transp.length = 8;
776 var->transp.offset = 24;
777 break;
778 default:
779 return -EINVAL;
780 }
781 return 0;
782 }
783 EXPORT_SYMBOL(drm_fb_helper_check_var);
784
785 /**
786 * drm_fb_helper_set_par - implementation for ->fb_set_par
787 * @info: fbdev registered by the helper
788 *
789 * This will let fbcon do the mode init and is called at initialization time by
790 * the fbdev core when registering the driver, and later on through the hotplug
791 * callback.
792 */
793 int drm_fb_helper_set_par(struct fb_info *info)
794 {
795 struct drm_fb_helper *fb_helper = info->par;
796 struct drm_device *dev = fb_helper->dev;
797 struct fb_var_screeninfo *var = &info->var;
798 int ret;
799 int i;
800
801 if (var->pixclock != 0) {
802 DRM_ERROR("PIXEL CLOCK SET\n");
803 return -EINVAL;
804 }
805
806 drm_modeset_lock_all(dev);
807 for (i = 0; i < fb_helper->crtc_count; i++) {
808 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
809 if (ret) {
810 drm_modeset_unlock_all(dev);
811 return ret;
812 }
813 }
814 drm_modeset_unlock_all(dev);
815
816 if (fb_helper->delayed_hotplug) {
817 fb_helper->delayed_hotplug = false;
818 drm_fb_helper_hotplug_event(fb_helper);
819 }
820 return 0;
821 }
822 EXPORT_SYMBOL(drm_fb_helper_set_par);
823
824 /**
825 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
826 * @var: updated screen information
827 * @info: fbdev registered by the helper
828 */
829 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
830 struct fb_info *info)
831 {
832 struct drm_fb_helper *fb_helper = info->par;
833 struct drm_device *dev = fb_helper->dev;
834 struct drm_mode_set *modeset;
835 struct drm_crtc *crtc;
836 int ret = 0;
837 int i;
838
839 drm_modeset_lock_all(dev);
840 if (!drm_fb_helper_is_bound(fb_helper)) {
841 drm_modeset_unlock_all(dev);
842 return -EBUSY;
843 }
844
845 for (i = 0; i < fb_helper->crtc_count; i++) {
846 crtc = fb_helper->crtc_info[i].mode_set.crtc;
847
848 modeset = &fb_helper->crtc_info[i].mode_set;
849
850 modeset->x = var->xoffset;
851 modeset->y = var->yoffset;
852
853 if (modeset->num_connectors) {
854 ret = drm_mode_set_config_internal(modeset);
855 if (!ret) {
856 info->var.xoffset = var->xoffset;
857 info->var.yoffset = var->yoffset;
858 }
859 }
860 }
861 drm_modeset_unlock_all(dev);
862 return ret;
863 }
864 EXPORT_SYMBOL(drm_fb_helper_pan_display);
865
866 /*
867 * Allocates the backing storage and sets up the fbdev info structure through
868 * the ->fb_probe callback and then registers the fbdev and sets up the panic
869 * notifier.
870 */
871 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
872 int preferred_bpp)
873 {
874 int ret = 0;
875 int crtc_count = 0;
876 int i;
877 struct fb_info *info;
878 struct drm_fb_helper_surface_size sizes;
879 int gamma_size = 0;
880
881 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
882 sizes.surface_depth = 24;
883 sizes.surface_bpp = 32;
884 sizes.fb_width = (unsigned)-1;
885 sizes.fb_height = (unsigned)-1;
886
887 /* if driver picks 8 or 16 by default use that
888 for both depth/bpp */
889 if (preferred_bpp != sizes.surface_bpp)
890 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
891
892 /* first up get a count of crtcs now in use and new min/maxes width/heights */
893 for (i = 0; i < fb_helper->connector_count; i++) {
894 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
895 struct drm_cmdline_mode *cmdline_mode;
896
897 cmdline_mode = &fb_helper_conn->cmdline_mode;
898
899 if (cmdline_mode->bpp_specified) {
900 switch (cmdline_mode->bpp) {
901 case 8:
902 sizes.surface_depth = sizes.surface_bpp = 8;
903 break;
904 case 15:
905 sizes.surface_depth = 15;
906 sizes.surface_bpp = 16;
907 break;
908 case 16:
909 sizes.surface_depth = sizes.surface_bpp = 16;
910 break;
911 case 24:
912 sizes.surface_depth = sizes.surface_bpp = 24;
913 break;
914 case 32:
915 sizes.surface_depth = 24;
916 sizes.surface_bpp = 32;
917 break;
918 }
919 break;
920 }
921 }
922
923 crtc_count = 0;
924 for (i = 0; i < fb_helper->crtc_count; i++) {
925 struct drm_display_mode *desired_mode;
926 desired_mode = fb_helper->crtc_info[i].desired_mode;
927
928 if (desired_mode) {
929 if (gamma_size == 0)
930 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
931 if (desired_mode->hdisplay < sizes.fb_width)
932 sizes.fb_width = desired_mode->hdisplay;
933 if (desired_mode->vdisplay < sizes.fb_height)
934 sizes.fb_height = desired_mode->vdisplay;
935 if (desired_mode->hdisplay > sizes.surface_width)
936 sizes.surface_width = desired_mode->hdisplay;
937 if (desired_mode->vdisplay > sizes.surface_height)
938 sizes.surface_height = desired_mode->vdisplay;
939 crtc_count++;
940 }
941 }
942
943 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
944 /* hmm everyone went away - assume VGA cable just fell out
945 and will come back later. */
946 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
947 sizes.fb_width = sizes.surface_width = 1024;
948 sizes.fb_height = sizes.surface_height = 768;
949 }
950
951 /* push down into drivers */
952 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
953 if (ret < 0)
954 return ret;
955
956 info = fb_helper->fbdev;
957
958 /*
959 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
960 * events, but at init time drm_setup_crtcs needs to be called before
961 * the fb is allocated (since we need to figure out the desired size of
962 * the fb before we can allocate it ...). Hence we need to fix things up
963 * here again.
964 */
965 for (i = 0; i < fb_helper->crtc_count; i++)
966 if (fb_helper->crtc_info[i].mode_set.num_connectors)
967 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
968
969
970 info->var.pixclock = 0;
971 if (register_framebuffer(info) < 0)
972 return -EINVAL;
973
974 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
975 info->node, info->fix.id);
976
977 /* Switch back to kernel console on panic */
978 /* multi card linked list maybe */
979 if (list_empty(&kernel_fb_helper_list)) {
980 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
981 atomic_notifier_chain_register(&panic_notifier_list,
982 &paniced);
983 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
984 }
985
986 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
987
988 return 0;
989 }
990
991 /**
992 * drm_fb_helper_fill_fix - initializes fixed fbdev information
993 * @info: fbdev registered by the helper
994 * @pitch: desired pitch
995 * @depth: desired depth
996 *
997 * Helper to fill in the fixed fbdev information useful for a non-accelerated
998 * fbdev emulations. Drivers which support acceleration methods which impose
999 * additional constraints need to set up their own limits.
1000 *
1001 * Drivers should call this (or their equivalent setup code) from their
1002 * ->fb_probe callback.
1003 */
1004 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1005 uint32_t depth)
1006 {
1007 info->fix.type = FB_TYPE_PACKED_PIXELS;
1008 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1009 FB_VISUAL_TRUECOLOR;
1010 info->fix.mmio_start = 0;
1011 info->fix.mmio_len = 0;
1012 info->fix.type_aux = 0;
1013 info->fix.xpanstep = 1; /* doing it in hw */
1014 info->fix.ypanstep = 1; /* doing it in hw */
1015 info->fix.ywrapstep = 0;
1016 info->fix.accel = FB_ACCEL_NONE;
1017 info->fix.type_aux = 0;
1018
1019 info->fix.line_length = pitch;
1020 return;
1021 }
1022 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1023
1024 /**
1025 * drm_fb_helper_fill_var - initalizes variable fbdev information
1026 * @info: fbdev instance to set up
1027 * @fb_helper: fb helper instance to use as template
1028 * @fb_width: desired fb width
1029 * @fb_height: desired fb height
1030 *
1031 * Sets up the variable fbdev metainformation from the given fb helper instance
1032 * and the drm framebuffer allocated in fb_helper->fb.
1033 *
1034 * Drivers should call this (or their equivalent setup code) from their
1035 * ->fb_probe callback after having allocated the fbdev backing
1036 * storage framebuffer.
1037 */
1038 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1039 uint32_t fb_width, uint32_t fb_height)
1040 {
1041 struct drm_framebuffer *fb = fb_helper->fb;
1042 info->pseudo_palette = fb_helper->pseudo_palette;
1043 info->var.xres_virtual = fb->width;
1044 info->var.yres_virtual = fb->height;
1045 info->var.bits_per_pixel = fb->bits_per_pixel;
1046 info->var.accel_flags = FB_ACCELF_TEXT;
1047 info->var.xoffset = 0;
1048 info->var.yoffset = 0;
1049 info->var.activate = FB_ACTIVATE_NOW;
1050 info->var.height = -1;
1051 info->var.width = -1;
1052
1053 switch (fb->depth) {
1054 case 8:
1055 info->var.red.offset = 0;
1056 info->var.green.offset = 0;
1057 info->var.blue.offset = 0;
1058 info->var.red.length = 8; /* 8bit DAC */
1059 info->var.green.length = 8;
1060 info->var.blue.length = 8;
1061 info->var.transp.offset = 0;
1062 info->var.transp.length = 0;
1063 break;
1064 case 15:
1065 info->var.red.offset = 10;
1066 info->var.green.offset = 5;
1067 info->var.blue.offset = 0;
1068 info->var.red.length = 5;
1069 info->var.green.length = 5;
1070 info->var.blue.length = 5;
1071 info->var.transp.offset = 15;
1072 info->var.transp.length = 1;
1073 break;
1074 case 16:
1075 info->var.red.offset = 11;
1076 info->var.green.offset = 5;
1077 info->var.blue.offset = 0;
1078 info->var.red.length = 5;
1079 info->var.green.length = 6;
1080 info->var.blue.length = 5;
1081 info->var.transp.offset = 0;
1082 break;
1083 case 24:
1084 info->var.red.offset = 16;
1085 info->var.green.offset = 8;
1086 info->var.blue.offset = 0;
1087 info->var.red.length = 8;
1088 info->var.green.length = 8;
1089 info->var.blue.length = 8;
1090 info->var.transp.offset = 0;
1091 info->var.transp.length = 0;
1092 break;
1093 case 32:
1094 info->var.red.offset = 16;
1095 info->var.green.offset = 8;
1096 info->var.blue.offset = 0;
1097 info->var.red.length = 8;
1098 info->var.green.length = 8;
1099 info->var.blue.length = 8;
1100 info->var.transp.offset = 24;
1101 info->var.transp.length = 8;
1102 break;
1103 default:
1104 break;
1105 }
1106
1107 info->var.xres = fb_width;
1108 info->var.yres = fb_height;
1109 }
1110 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1111
1112 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1113 uint32_t maxX,
1114 uint32_t maxY)
1115 {
1116 struct drm_connector *connector;
1117 int count = 0;
1118 int i;
1119
1120 for (i = 0; i < fb_helper->connector_count; i++) {
1121 connector = fb_helper->connector_info[i]->connector;
1122 count += connector->funcs->fill_modes(connector, maxX, maxY);
1123 }
1124
1125 return count;
1126 }
1127
1128 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1129 {
1130 struct drm_display_mode *mode;
1131
1132 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1133 if (drm_mode_width(mode) > width ||
1134 drm_mode_height(mode) > height)
1135 continue;
1136 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1137 return mode;
1138 }
1139 return NULL;
1140 }
1141
1142 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1143 {
1144 struct drm_cmdline_mode *cmdline_mode;
1145 cmdline_mode = &fb_connector->cmdline_mode;
1146 return cmdline_mode->specified;
1147 }
1148
1149 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1150 int width, int height)
1151 {
1152 struct drm_cmdline_mode *cmdline_mode;
1153 struct drm_display_mode *mode = NULL;
1154
1155 cmdline_mode = &fb_helper_conn->cmdline_mode;
1156 if (cmdline_mode->specified == false)
1157 return mode;
1158
1159 /* attempt to find a matching mode in the list of modes
1160 * we have gotten so far, if not add a CVT mode that conforms
1161 */
1162 if (cmdline_mode->rb || cmdline_mode->margins)
1163 goto create_mode;
1164
1165 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1166 /* check width/height */
1167 if (mode->hdisplay != cmdline_mode->xres ||
1168 mode->vdisplay != cmdline_mode->yres)
1169 continue;
1170
1171 if (cmdline_mode->refresh_specified) {
1172 if (mode->vrefresh != cmdline_mode->refresh)
1173 continue;
1174 }
1175
1176 if (cmdline_mode->interlace) {
1177 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1178 continue;
1179 }
1180 return mode;
1181 }
1182
1183 create_mode:
1184 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1185 cmdline_mode);
1186 list_add(&mode->head, &fb_helper_conn->connector->modes);
1187 return mode;
1188 }
1189
1190 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1191 {
1192 bool enable;
1193
1194 if (strict)
1195 enable = connector->status == connector_status_connected;
1196 else
1197 enable = connector->status != connector_status_disconnected;
1198
1199 return enable;
1200 }
1201
1202 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1203 bool *enabled)
1204 {
1205 bool any_enabled = false;
1206 struct drm_connector *connector;
1207 int i = 0;
1208
1209 for (i = 0; i < fb_helper->connector_count; i++) {
1210 connector = fb_helper->connector_info[i]->connector;
1211 enabled[i] = drm_connector_enabled(connector, true);
1212 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1213 enabled[i] ? "yes" : "no");
1214 any_enabled |= enabled[i];
1215 }
1216
1217 if (any_enabled)
1218 return;
1219
1220 for (i = 0; i < fb_helper->connector_count; i++) {
1221 connector = fb_helper->connector_info[i]->connector;
1222 enabled[i] = drm_connector_enabled(connector, false);
1223 }
1224 }
1225
1226 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1227 struct drm_display_mode **modes,
1228 bool *enabled, int width, int height)
1229 {
1230 int count, i, j;
1231 bool can_clone = false;
1232 struct drm_fb_helper_connector *fb_helper_conn;
1233 struct drm_display_mode *dmt_mode, *mode;
1234
1235 /* only contemplate cloning in the single crtc case */
1236 if (fb_helper->crtc_count > 1)
1237 return false;
1238
1239 count = 0;
1240 for (i = 0; i < fb_helper->connector_count; i++) {
1241 if (enabled[i])
1242 count++;
1243 }
1244
1245 /* only contemplate cloning if more than one connector is enabled */
1246 if (count <= 1)
1247 return false;
1248
1249 /* check the command line or if nothing common pick 1024x768 */
1250 can_clone = true;
1251 for (i = 0; i < fb_helper->connector_count; i++) {
1252 if (!enabled[i])
1253 continue;
1254 fb_helper_conn = fb_helper->connector_info[i];
1255 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1256 if (!modes[i]) {
1257 can_clone = false;
1258 break;
1259 }
1260 for (j = 0; j < i; j++) {
1261 if (!enabled[j])
1262 continue;
1263 if (!drm_mode_equal(modes[j], modes[i]))
1264 can_clone = false;
1265 }
1266 }
1267
1268 if (can_clone) {
1269 DRM_DEBUG_KMS("can clone using command line\n");
1270 return true;
1271 }
1272
1273 /* try and find a 1024x768 mode on each connector */
1274 can_clone = true;
1275 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1276
1277 for (i = 0; i < fb_helper->connector_count; i++) {
1278
1279 if (!enabled[i])
1280 continue;
1281
1282 fb_helper_conn = fb_helper->connector_info[i];
1283 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1284 if (drm_mode_equal(mode, dmt_mode))
1285 modes[i] = mode;
1286 }
1287 if (!modes[i])
1288 can_clone = false;
1289 }
1290
1291 if (can_clone) {
1292 DRM_DEBUG_KMS("can clone using 1024x768\n");
1293 return true;
1294 }
1295 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1296 return false;
1297 }
1298
1299 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1300 struct drm_display_mode **modes,
1301 bool *enabled, int width, int height)
1302 {
1303 struct drm_fb_helper_connector *fb_helper_conn;
1304 int i;
1305
1306 for (i = 0; i < fb_helper->connector_count; i++) {
1307 fb_helper_conn = fb_helper->connector_info[i];
1308
1309 if (enabled[i] == false)
1310 continue;
1311
1312 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1313 fb_helper_conn->connector->base.id);
1314
1315 /* got for command line mode first */
1316 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1317 if (!modes[i]) {
1318 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1319 fb_helper_conn->connector->base.id);
1320 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1321 }
1322 /* No preferred modes, pick one off the list */
1323 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1324 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1325 break;
1326 }
1327 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1328 "none");
1329 }
1330 return true;
1331 }
1332
1333 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1334 struct drm_fb_helper_crtc **best_crtcs,
1335 struct drm_display_mode **modes,
1336 int n, int width, int height)
1337 {
1338 int c, o;
1339 struct drm_device *dev = fb_helper->dev;
1340 struct drm_connector *connector;
1341 struct drm_connector_helper_funcs *connector_funcs;
1342 struct drm_encoder *encoder;
1343 struct drm_fb_helper_crtc *best_crtc;
1344 int my_score, best_score, score;
1345 struct drm_fb_helper_crtc **crtcs, *crtc;
1346 struct drm_fb_helper_connector *fb_helper_conn;
1347
1348 if (n == fb_helper->connector_count)
1349 return 0;
1350
1351 fb_helper_conn = fb_helper->connector_info[n];
1352 connector = fb_helper_conn->connector;
1353
1354 best_crtcs[n] = NULL;
1355 best_crtc = NULL;
1356 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1357 if (modes[n] == NULL)
1358 return best_score;
1359
1360 crtcs = kzalloc(dev->mode_config.num_connector *
1361 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1362 if (!crtcs)
1363 return best_score;
1364
1365 my_score = 1;
1366 if (connector->status == connector_status_connected)
1367 my_score++;
1368 if (drm_has_cmdline_mode(fb_helper_conn))
1369 my_score++;
1370 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1371 my_score++;
1372
1373 connector_funcs = connector->helper_private;
1374 encoder = connector_funcs->best_encoder(connector);
1375 if (!encoder)
1376 goto out;
1377
1378 /* select a crtc for this connector and then attempt to configure
1379 remaining connectors */
1380 for (c = 0; c < fb_helper->crtc_count; c++) {
1381 crtc = &fb_helper->crtc_info[c];
1382
1383 if ((encoder->possible_crtcs & (1 << c)) == 0)
1384 continue;
1385
1386 for (o = 0; o < n; o++)
1387 if (best_crtcs[o] == crtc)
1388 break;
1389
1390 if (o < n) {
1391 /* ignore cloning unless only a single crtc */
1392 if (fb_helper->crtc_count > 1)
1393 continue;
1394
1395 if (!drm_mode_equal(modes[o], modes[n]))
1396 continue;
1397 }
1398
1399 crtcs[n] = crtc;
1400 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1401 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1402 width, height);
1403 if (score > best_score) {
1404 best_crtc = crtc;
1405 best_score = score;
1406 memcpy(best_crtcs, crtcs,
1407 dev->mode_config.num_connector *
1408 sizeof(struct drm_fb_helper_crtc *));
1409 }
1410 }
1411 out:
1412 kfree(crtcs);
1413 return best_score;
1414 }
1415
1416 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1417 {
1418 struct drm_device *dev = fb_helper->dev;
1419 struct drm_fb_helper_crtc **crtcs;
1420 struct drm_display_mode **modes;
1421 struct drm_mode_set *modeset;
1422 bool *enabled;
1423 int width, height;
1424 int i;
1425
1426 DRM_DEBUG_KMS("\n");
1427
1428 width = dev->mode_config.max_width;
1429 height = dev->mode_config.max_height;
1430
1431 crtcs = kcalloc(dev->mode_config.num_connector,
1432 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1433 modes = kcalloc(dev->mode_config.num_connector,
1434 sizeof(struct drm_display_mode *), GFP_KERNEL);
1435 enabled = kcalloc(dev->mode_config.num_connector,
1436 sizeof(bool), GFP_KERNEL);
1437 if (!crtcs || !modes || !enabled) {
1438 DRM_ERROR("Memory allocation failed\n");
1439 goto out;
1440 }
1441
1442
1443 drm_enable_connectors(fb_helper, enabled);
1444
1445 if (!(fb_helper->funcs->initial_config &&
1446 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1447 enabled, width, height))) {
1448 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1449 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1450
1451 if (!drm_target_cloned(fb_helper,
1452 modes, enabled, width, height) &&
1453 !drm_target_preferred(fb_helper,
1454 modes, enabled, width, height))
1455 DRM_ERROR("Unable to find initial modes\n");
1456
1457 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1458 width, height);
1459
1460 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1461 }
1462
1463 /* need to set the modesets up here for use later */
1464 /* fill out the connector<->crtc mappings into the modesets */
1465 for (i = 0; i < fb_helper->crtc_count; i++) {
1466 modeset = &fb_helper->crtc_info[i].mode_set;
1467 modeset->num_connectors = 0;
1468 modeset->fb = NULL;
1469 }
1470
1471 for (i = 0; i < fb_helper->connector_count; i++) {
1472 struct drm_display_mode *mode = modes[i];
1473 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1474 modeset = &fb_crtc->mode_set;
1475
1476 if (mode && fb_crtc) {
1477 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1478 mode->name, fb_crtc->mode_set.crtc->base.id);
1479 fb_crtc->desired_mode = mode;
1480 if (modeset->mode)
1481 drm_mode_destroy(dev, modeset->mode);
1482 modeset->mode = drm_mode_duplicate(dev,
1483 fb_crtc->desired_mode);
1484 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1485 modeset->fb = fb_helper->fb;
1486 }
1487 }
1488
1489 /* Clear out any old modes if there are no more connected outputs. */
1490 for (i = 0; i < fb_helper->crtc_count; i++) {
1491 modeset = &fb_helper->crtc_info[i].mode_set;
1492 if (modeset->num_connectors == 0) {
1493 BUG_ON(modeset->fb);
1494 BUG_ON(modeset->num_connectors);
1495 if (modeset->mode)
1496 drm_mode_destroy(dev, modeset->mode);
1497 modeset->mode = NULL;
1498 }
1499 }
1500 out:
1501 kfree(crtcs);
1502 kfree(modes);
1503 kfree(enabled);
1504 }
1505
1506 /**
1507 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1508 * @fb_helper: fb_helper device struct
1509 * @bpp_sel: bpp value to use for the framebuffer configuration
1510 *
1511 * Scans the CRTCs and connectors and tries to put together an initial setup.
1512 * At the moment, this is a cloned configuration across all heads with
1513 * a new framebuffer object as the backing store.
1514 *
1515 * Note that this also registers the fbdev and so allows userspace to call into
1516 * the driver through the fbdev interfaces.
1517 *
1518 * This function will call down into the ->fb_probe callback to let
1519 * the driver allocate and initialize the fbdev info structure and the drm
1520 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1521 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1522 * values for the fbdev info structure.
1523 *
1524 * RETURNS:
1525 * Zero if everything went ok, nonzero otherwise.
1526 */
1527 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1528 {
1529 struct drm_device *dev = fb_helper->dev;
1530 int count = 0;
1531
1532 drm_fb_helper_parse_command_line(fb_helper);
1533
1534 count = drm_fb_helper_probe_connector_modes(fb_helper,
1535 dev->mode_config.max_width,
1536 dev->mode_config.max_height);
1537 /*
1538 * we shouldn't end up with no modes here.
1539 */
1540 if (count == 0)
1541 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1542
1543 drm_setup_crtcs(fb_helper);
1544
1545 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1546 }
1547 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1548
1549 /**
1550 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1551 * probing all the outputs attached to the fb
1552 * @fb_helper: the drm_fb_helper
1553 *
1554 * Scan the connectors attached to the fb_helper and try to put together a
1555 * setup after *notification of a change in output configuration.
1556 *
1557 * Called at runtime, takes the mode config locks to be able to check/change the
1558 * modeset configuration. Must be run from process context (which usually means
1559 * either the output polling work or a work item launched from the driver's
1560 * hotplug interrupt).
1561 *
1562 * Note that the driver must ensure that this is only called _after_ the fb has
1563 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1564 *
1565 * RETURNS:
1566 * 0 on success and a non-zero error code otherwise.
1567 */
1568 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1569 {
1570 struct drm_device *dev = fb_helper->dev;
1571 int count = 0;
1572 u32 max_width, max_height, bpp_sel;
1573
1574 if (!fb_helper->fb)
1575 return 0;
1576
1577 mutex_lock(&fb_helper->dev->mode_config.mutex);
1578 if (!drm_fb_helper_is_bound(fb_helper)) {
1579 fb_helper->delayed_hotplug = true;
1580 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1581 return 0;
1582 }
1583 DRM_DEBUG_KMS("\n");
1584
1585 max_width = fb_helper->fb->width;
1586 max_height = fb_helper->fb->height;
1587 bpp_sel = fb_helper->fb->bits_per_pixel;
1588
1589 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1590 max_height);
1591 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1592
1593 drm_modeset_lock_all(dev);
1594 drm_setup_crtcs(fb_helper);
1595 drm_modeset_unlock_all(dev);
1596 drm_fb_helper_set_par(fb_helper->fbdev);
1597
1598 return 0;
1599 }
1600 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1601
1602 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1603 * but the module doesn't depend on any fb console symbols. At least
1604 * attempt to load fbcon to avoid leaving the system without a usable console.
1605 */
1606 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1607 static int __init drm_fb_helper_modinit(void)
1608 {
1609 const char *name = "fbcon";
1610 struct module *fbcon;
1611
1612 mutex_lock(&module_mutex);
1613 fbcon = find_module(name);
1614 mutex_unlock(&module_mutex);
1615
1616 if (!fbcon)
1617 request_module_nowait(name);
1618 return 0;
1619 }
1620
1621 module_init(drm_fb_helper_modinit);
1622 #endif
Linux kernel - Deliverables
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