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drm: Replace crtc fb with primary plane fb (v3)
[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 static LIST_HEAD(kernel_fb_helper_list);
43
44 /**
45 * DOC: fbdev helpers
46 *
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independantely from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
50 * interfaces.
51 *
52 * Initialization is done as a three-step process with drm_fb_helper_init(),
53 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
54 * Drivers with fancier requirements than the default beheviour can override the
55 * second step with their own code. Teardown is done with drm_fb_helper_fini().
56 *
57 * At runtime drivers should restore the fbdev console by calling
58 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
59 * should also notify the fb helper code from updates to the output
60 * configuration by calling drm_fb_helper_hotplug_event(). For easier
61 * integration with the output polling code in drm_crtc_helper.c the modeset
62 * code proves a ->output_poll_changed callback.
63 *
64 * All other functions exported by the fb helper library can be used to
65 * implement the fbdev driver interface by the driver.
66 */
67
68 /**
69 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
70 * emulation helper
71 * @fb_helper: fbdev initialized with drm_fb_helper_init
72 *
73 * This functions adds all the available connectors for use with the given
74 * fb_helper. This is a separate step to allow drivers to freely assign
75 * connectors to the fbdev, e.g. if some are reserved for special purposes or
76 * not adequate to be used for the fbcon.
77 *
78 * Since this is part of the initial setup before the fbdev is published, no
79 * locking is required.
80 */
81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
82 {
83 struct drm_device *dev = fb_helper->dev;
84 struct drm_connector *connector;
85 int i;
86
87 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
88 struct drm_fb_helper_connector *fb_helper_connector;
89
90 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
91 if (!fb_helper_connector)
92 goto fail;
93
94 fb_helper_connector->connector = connector;
95 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
96 }
97 return 0;
98 fail:
99 for (i = 0; i < fb_helper->connector_count; i++) {
100 kfree(fb_helper->connector_info[i]);
101 fb_helper->connector_info[i] = NULL;
102 }
103 fb_helper->connector_count = 0;
104 return -ENOMEM;
105 }
106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
107
108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
109 {
110 struct drm_fb_helper_connector *fb_helper_conn;
111 int i;
112
113 for (i = 0; i < fb_helper->connector_count; i++) {
114 struct drm_cmdline_mode *mode;
115 struct drm_connector *connector;
116 char *option = NULL;
117
118 fb_helper_conn = fb_helper->connector_info[i];
119 connector = fb_helper_conn->connector;
120 mode = &fb_helper_conn->cmdline_mode;
121
122 /* do something on return - turn off connector maybe */
123 if (fb_get_options(drm_get_connector_name(connector), &option))
124 continue;
125
126 if (drm_mode_parse_command_line_for_connector(option,
127 connector,
128 mode)) {
129 if (mode->force) {
130 const char *s;
131 switch (mode->force) {
132 case DRM_FORCE_OFF:
133 s = "OFF";
134 break;
135 case DRM_FORCE_ON_DIGITAL:
136 s = "ON - dig";
137 break;
138 default:
139 case DRM_FORCE_ON:
140 s = "ON";
141 break;
142 }
143
144 DRM_INFO("forcing %s connector %s\n",
145 drm_get_connector_name(connector), s);
146 connector->force = mode->force;
147 }
148
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
150 drm_get_connector_name(connector),
151 mode->xres, mode->yres,
152 mode->refresh_specified ? mode->refresh : 60,
153 mode->rb ? " reduced blanking" : "",
154 mode->margins ? " with margins" : "",
155 mode->interlace ? " interlaced" : "");
156 }
157
158 }
159 return 0;
160 }
161
162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
163 {
164 uint16_t *r_base, *g_base, *b_base;
165 int i;
166
167 if (helper->funcs->gamma_get == NULL)
168 return;
169
170 r_base = crtc->gamma_store;
171 g_base = r_base + crtc->gamma_size;
172 b_base = g_base + crtc->gamma_size;
173
174 for (i = 0; i < crtc->gamma_size; i++)
175 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
176 }
177
178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
179 {
180 uint16_t *r_base, *g_base, *b_base;
181
182 if (crtc->funcs->gamma_set == NULL)
183 return;
184
185 r_base = crtc->gamma_store;
186 g_base = r_base + crtc->gamma_size;
187 b_base = g_base + crtc->gamma_size;
188
189 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
190 }
191
192 /**
193 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
194 * @info: fbdev registered by the helper
195 */
196 int drm_fb_helper_debug_enter(struct fb_info *info)
197 {
198 struct drm_fb_helper *helper = info->par;
199 struct drm_crtc_helper_funcs *funcs;
200 int i;
201
202 if (list_empty(&kernel_fb_helper_list))
203 return false;
204
205 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
206 for (i = 0; i < helper->crtc_count; i++) {
207 struct drm_mode_set *mode_set =
208 &helper->crtc_info[i].mode_set;
209
210 if (!mode_set->crtc->enabled)
211 continue;
212
213 funcs = mode_set->crtc->helper_private;
214 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
215 funcs->mode_set_base_atomic(mode_set->crtc,
216 mode_set->fb,
217 mode_set->x,
218 mode_set->y,
219 ENTER_ATOMIC_MODE_SET);
220 }
221 }
222
223 return 0;
224 }
225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
226
227 /* Find the real fb for a given fb helper CRTC */
228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
229 {
230 struct drm_device *dev = crtc->dev;
231 struct drm_crtc *c;
232
233 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
234 if (crtc->base.id == c->base.id)
235 return c->primary->fb;
236 }
237
238 return NULL;
239 }
240
241 /**
242 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
243 * @info: fbdev registered by the helper
244 */
245 int drm_fb_helper_debug_leave(struct fb_info *info)
246 {
247 struct drm_fb_helper *helper = info->par;
248 struct drm_crtc *crtc;
249 struct drm_crtc_helper_funcs *funcs;
250 struct drm_framebuffer *fb;
251 int i;
252
253 for (i = 0; i < helper->crtc_count; i++) {
254 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
255 crtc = mode_set->crtc;
256 funcs = crtc->helper_private;
257 fb = drm_mode_config_fb(crtc);
258
259 if (!crtc->enabled)
260 continue;
261
262 if (!fb) {
263 DRM_ERROR("no fb to restore??\n");
264 continue;
265 }
266
267 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
268 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
269 crtc->y, LEAVE_ATOMIC_MODE_SET);
270 }
271
272 return 0;
273 }
274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
275
276 /**
277 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
278 * @fb_helper: fbcon to restore
279 *
280 * This should be called from driver's drm ->lastclose callback
281 * when implementing an fbcon on top of kms using this helper. This ensures that
282 * the user isn't greeted with a black screen when e.g. X dies.
283 */
284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
285 {
286 struct drm_device *dev = fb_helper->dev;
287 struct drm_plane *plane;
288 bool error = false;
289 int i;
290
291 drm_warn_on_modeset_not_all_locked(dev);
292
293 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
294 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
295 drm_plane_force_disable(plane);
296
297 for (i = 0; i < fb_helper->crtc_count; i++) {
298 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
299 struct drm_crtc *crtc = mode_set->crtc;
300 int ret;
301
302 if (crtc->funcs->cursor_set) {
303 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
304 if (ret)
305 error = true;
306 }
307
308 ret = drm_mode_set_config_internal(mode_set);
309 if (ret)
310 error = true;
311 }
312 return error;
313 }
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 /* Sometimes user space wants everything disabled, so don't steal the
364 * display if there's a master. */
365 if (dev->primary->master)
366 return false;
367
368 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
369 if (crtc->primary->fb)
370 crtcs_bound++;
371 if (crtc->primary->fb == fb_helper->fb)
372 bound++;
373 }
374
375 if (bound < crtcs_bound)
376 return false;
377
378 return true;
379 }
380
381 #ifdef CONFIG_MAGIC_SYSRQ
382 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
383 {
384 bool ret;
385 ret = drm_fb_helper_force_kernel_mode();
386 if (ret == true)
387 DRM_ERROR("Failed to restore crtc configuration\n");
388 }
389 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
390
391 static void drm_fb_helper_sysrq(int dummy1)
392 {
393 schedule_work(&drm_fb_helper_restore_work);
394 }
395
396 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
397 .handler = drm_fb_helper_sysrq,
398 .help_msg = "force-fb(V)",
399 .action_msg = "Restore framebuffer console",
400 };
401 #else
402 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
403 #endif
404
405 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
406 {
407 struct drm_fb_helper *fb_helper = info->par;
408 struct drm_device *dev = fb_helper->dev;
409 struct drm_crtc *crtc;
410 struct drm_connector *connector;
411 int i, j;
412
413 /*
414 * fbdev->blank can be called from irq context in case of a panic.
415 * Since we already have our own special panic handler which will
416 * restore the fbdev console mode completely, just bail out early.
417 */
418 if (oops_in_progress)
419 return;
420
421 /*
422 * For each CRTC in this fb, turn the connectors on/off.
423 */
424 drm_modeset_lock_all(dev);
425 if (!drm_fb_helper_is_bound(fb_helper)) {
426 drm_modeset_unlock_all(dev);
427 return;
428 }
429
430 for (i = 0; i < fb_helper->crtc_count; i++) {
431 crtc = fb_helper->crtc_info[i].mode_set.crtc;
432
433 if (!crtc->enabled)
434 continue;
435
436 /* Walk the connectors & encoders on this fb turning them on/off */
437 for (j = 0; j < fb_helper->connector_count; j++) {
438 connector = fb_helper->connector_info[j]->connector;
439 connector->funcs->dpms(connector, dpms_mode);
440 drm_object_property_set_value(&connector->base,
441 dev->mode_config.dpms_property, dpms_mode);
442 }
443 }
444 drm_modeset_unlock_all(dev);
445 }
446
447 /**
448 * drm_fb_helper_blank - implementation for ->fb_blank
449 * @blank: desired blanking state
450 * @info: fbdev registered by the helper
451 */
452 int drm_fb_helper_blank(int blank, struct fb_info *info)
453 {
454 switch (blank) {
455 /* Display: On; HSync: On, VSync: On */
456 case FB_BLANK_UNBLANK:
457 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
458 break;
459 /* Display: Off; HSync: On, VSync: On */
460 case FB_BLANK_NORMAL:
461 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
462 break;
463 /* Display: Off; HSync: Off, VSync: On */
464 case FB_BLANK_HSYNC_SUSPEND:
465 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
466 break;
467 /* Display: Off; HSync: On, VSync: Off */
468 case FB_BLANK_VSYNC_SUSPEND:
469 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
470 break;
471 /* Display: Off; HSync: Off, VSync: Off */
472 case FB_BLANK_POWERDOWN:
473 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
474 break;
475 }
476 return 0;
477 }
478 EXPORT_SYMBOL(drm_fb_helper_blank);
479
480 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
481 {
482 int i;
483
484 for (i = 0; i < helper->connector_count; i++)
485 kfree(helper->connector_info[i]);
486 kfree(helper->connector_info);
487 for (i = 0; i < helper->crtc_count; i++) {
488 kfree(helper->crtc_info[i].mode_set.connectors);
489 if (helper->crtc_info[i].mode_set.mode)
490 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
491 }
492 kfree(helper->crtc_info);
493 }
494
495 /**
496 * drm_fb_helper_init - initialize a drm_fb_helper structure
497 * @dev: drm device
498 * @fb_helper: driver-allocated fbdev helper structure to initialize
499 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
500 * @max_conn_count: max connector count
501 *
502 * This allocates the structures for the fbdev helper with the given limits.
503 * Note that this won't yet touch the hardware (through the driver interfaces)
504 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
505 * to allow driver writes more control over the exact init sequence.
506 *
507 * Drivers must set fb_helper->funcs before calling
508 * drm_fb_helper_initial_config().
509 *
510 * RETURNS:
511 * Zero if everything went ok, nonzero otherwise.
512 */
513 int drm_fb_helper_init(struct drm_device *dev,
514 struct drm_fb_helper *fb_helper,
515 int crtc_count, int max_conn_count)
516 {
517 struct drm_crtc *crtc;
518 int i;
519
520 if (!max_conn_count)
521 return -EINVAL;
522
523 fb_helper->dev = dev;
524
525 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
526
527 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
528 if (!fb_helper->crtc_info)
529 return -ENOMEM;
530
531 fb_helper->crtc_count = crtc_count;
532 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
533 if (!fb_helper->connector_info) {
534 kfree(fb_helper->crtc_info);
535 return -ENOMEM;
536 }
537 fb_helper->connector_count = 0;
538
539 for (i = 0; i < crtc_count; i++) {
540 fb_helper->crtc_info[i].mode_set.connectors =
541 kcalloc(max_conn_count,
542 sizeof(struct drm_connector *),
543 GFP_KERNEL);
544
545 if (!fb_helper->crtc_info[i].mode_set.connectors)
546 goto out_free;
547 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
548 }
549
550 i = 0;
551 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
552 fb_helper->crtc_info[i].mode_set.crtc = crtc;
553 i++;
554 }
555
556 return 0;
557 out_free:
558 drm_fb_helper_crtc_free(fb_helper);
559 return -ENOMEM;
560 }
561 EXPORT_SYMBOL(drm_fb_helper_init);
562
563 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
564 {
565 if (!list_empty(&fb_helper->kernel_fb_list)) {
566 list_del(&fb_helper->kernel_fb_list);
567 if (list_empty(&kernel_fb_helper_list)) {
568 pr_info("drm: unregistered panic notifier\n");
569 atomic_notifier_chain_unregister(&panic_notifier_list,
570 &paniced);
571 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
572 }
573 }
574
575 drm_fb_helper_crtc_free(fb_helper);
576
577 }
578 EXPORT_SYMBOL(drm_fb_helper_fini);
579
580 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
581 u16 blue, u16 regno, struct fb_info *info)
582 {
583 struct drm_fb_helper *fb_helper = info->par;
584 struct drm_framebuffer *fb = fb_helper->fb;
585 int pindex;
586
587 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
588 u32 *palette;
589 u32 value;
590 /* place color in psuedopalette */
591 if (regno > 16)
592 return -EINVAL;
593 palette = (u32 *)info->pseudo_palette;
594 red >>= (16 - info->var.red.length);
595 green >>= (16 - info->var.green.length);
596 blue >>= (16 - info->var.blue.length);
597 value = (red << info->var.red.offset) |
598 (green << info->var.green.offset) |
599 (blue << info->var.blue.offset);
600 if (info->var.transp.length > 0) {
601 u32 mask = (1 << info->var.transp.length) - 1;
602 mask <<= info->var.transp.offset;
603 value |= mask;
604 }
605 palette[regno] = value;
606 return 0;
607 }
608
609 /*
610 * The driver really shouldn't advertise pseudo/directcolor
611 * visuals if it can't deal with the palette.
612 */
613 if (WARN_ON(!fb_helper->funcs->gamma_set ||
614 !fb_helper->funcs->gamma_get))
615 return -EINVAL;
616
617 pindex = regno;
618
619 if (fb->bits_per_pixel == 16) {
620 pindex = regno << 3;
621
622 if (fb->depth == 16 && regno > 63)
623 return -EINVAL;
624 if (fb->depth == 15 && regno > 31)
625 return -EINVAL;
626
627 if (fb->depth == 16) {
628 u16 r, g, b;
629 int i;
630 if (regno < 32) {
631 for (i = 0; i < 8; i++)
632 fb_helper->funcs->gamma_set(crtc, red,
633 green, blue, pindex + i);
634 }
635
636 fb_helper->funcs->gamma_get(crtc, &r,
637 &g, &b,
638 pindex >> 1);
639
640 for (i = 0; i < 4; i++)
641 fb_helper->funcs->gamma_set(crtc, r,
642 green, b,
643 (pindex >> 1) + i);
644 }
645 }
646
647 if (fb->depth != 16)
648 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
649 return 0;
650 }
651
652 /**
653 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
654 * @cmap: cmap to set
655 * @info: fbdev registered by the helper
656 */
657 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
658 {
659 struct drm_fb_helper *fb_helper = info->par;
660 struct drm_device *dev = fb_helper->dev;
661 struct drm_crtc_helper_funcs *crtc_funcs;
662 u16 *red, *green, *blue, *transp;
663 struct drm_crtc *crtc;
664 int i, j, rc = 0;
665 int start;
666
667 drm_modeset_lock_all(dev);
668 if (!drm_fb_helper_is_bound(fb_helper)) {
669 drm_modeset_unlock_all(dev);
670 return -EBUSY;
671 }
672
673 for (i = 0; i < fb_helper->crtc_count; i++) {
674 crtc = fb_helper->crtc_info[i].mode_set.crtc;
675 crtc_funcs = crtc->helper_private;
676
677 red = cmap->red;
678 green = cmap->green;
679 blue = cmap->blue;
680 transp = cmap->transp;
681 start = cmap->start;
682
683 for (j = 0; j < cmap->len; j++) {
684 u16 hred, hgreen, hblue, htransp = 0xffff;
685
686 hred = *red++;
687 hgreen = *green++;
688 hblue = *blue++;
689
690 if (transp)
691 htransp = *transp++;
692
693 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
694 if (rc)
695 goto out;
696 }
697 if (crtc_funcs->load_lut)
698 crtc_funcs->load_lut(crtc);
699 }
700 out:
701 drm_modeset_unlock_all(dev);
702 return rc;
703 }
704 EXPORT_SYMBOL(drm_fb_helper_setcmap);
705
706 /**
707 * drm_fb_helper_check_var - implementation for ->fb_check_var
708 * @var: screeninfo to check
709 * @info: fbdev registered by the helper
710 */
711 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
712 struct fb_info *info)
713 {
714 struct drm_fb_helper *fb_helper = info->par;
715 struct drm_framebuffer *fb = fb_helper->fb;
716 int depth;
717
718 if (var->pixclock != 0 || in_dbg_master())
719 return -EINVAL;
720
721 /* Need to resize the fb object !!! */
722 if (var->bits_per_pixel > fb->bits_per_pixel ||
723 var->xres > fb->width || var->yres > fb->height ||
724 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
725 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
726 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
727 var->xres, var->yres, var->bits_per_pixel,
728 var->xres_virtual, var->yres_virtual,
729 fb->width, fb->height, fb->bits_per_pixel);
730 return -EINVAL;
731 }
732
733 switch (var->bits_per_pixel) {
734 case 16:
735 depth = (var->green.length == 6) ? 16 : 15;
736 break;
737 case 32:
738 depth = (var->transp.length > 0) ? 32 : 24;
739 break;
740 default:
741 depth = var->bits_per_pixel;
742 break;
743 }
744
745 switch (depth) {
746 case 8:
747 var->red.offset = 0;
748 var->green.offset = 0;
749 var->blue.offset = 0;
750 var->red.length = 8;
751 var->green.length = 8;
752 var->blue.length = 8;
753 var->transp.length = 0;
754 var->transp.offset = 0;
755 break;
756 case 15:
757 var->red.offset = 10;
758 var->green.offset = 5;
759 var->blue.offset = 0;
760 var->red.length = 5;
761 var->green.length = 5;
762 var->blue.length = 5;
763 var->transp.length = 1;
764 var->transp.offset = 15;
765 break;
766 case 16:
767 var->red.offset = 11;
768 var->green.offset = 5;
769 var->blue.offset = 0;
770 var->red.length = 5;
771 var->green.length = 6;
772 var->blue.length = 5;
773 var->transp.length = 0;
774 var->transp.offset = 0;
775 break;
776 case 24:
777 var->red.offset = 16;
778 var->green.offset = 8;
779 var->blue.offset = 0;
780 var->red.length = 8;
781 var->green.length = 8;
782 var->blue.length = 8;
783 var->transp.length = 0;
784 var->transp.offset = 0;
785 break;
786 case 32:
787 var->red.offset = 16;
788 var->green.offset = 8;
789 var->blue.offset = 0;
790 var->red.length = 8;
791 var->green.length = 8;
792 var->blue.length = 8;
793 var->transp.length = 8;
794 var->transp.offset = 24;
795 break;
796 default:
797 return -EINVAL;
798 }
799 return 0;
800 }
801 EXPORT_SYMBOL(drm_fb_helper_check_var);
802
803 /**
804 * drm_fb_helper_set_par - implementation for ->fb_set_par
805 * @info: fbdev registered by the helper
806 *
807 * This will let fbcon do the mode init and is called at initialization time by
808 * the fbdev core when registering the driver, and later on through the hotplug
809 * callback.
810 */
811 int drm_fb_helper_set_par(struct fb_info *info)
812 {
813 struct drm_fb_helper *fb_helper = info->par;
814 struct drm_device *dev = fb_helper->dev;
815 struct fb_var_screeninfo *var = &info->var;
816
817 if (var->pixclock != 0) {
818 DRM_ERROR("PIXEL CLOCK SET\n");
819 return -EINVAL;
820 }
821
822 drm_modeset_lock_all(dev);
823 drm_fb_helper_restore_fbdev_mode(fb_helper);
824 drm_modeset_unlock_all(dev);
825
826 if (fb_helper->delayed_hotplug) {
827 fb_helper->delayed_hotplug = false;
828 drm_fb_helper_hotplug_event(fb_helper);
829 }
830 return 0;
831 }
832 EXPORT_SYMBOL(drm_fb_helper_set_par);
833
834 /**
835 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
836 * @var: updated screen information
837 * @info: fbdev registered by the helper
838 */
839 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
840 struct fb_info *info)
841 {
842 struct drm_fb_helper *fb_helper = info->par;
843 struct drm_device *dev = fb_helper->dev;
844 struct drm_mode_set *modeset;
845 int ret = 0;
846 int i;
847
848 drm_modeset_lock_all(dev);
849 if (!drm_fb_helper_is_bound(fb_helper)) {
850 drm_modeset_unlock_all(dev);
851 return -EBUSY;
852 }
853
854 for (i = 0; i < fb_helper->crtc_count; i++) {
855 modeset = &fb_helper->crtc_info[i].mode_set;
856
857 modeset->x = var->xoffset;
858 modeset->y = var->yoffset;
859
860 if (modeset->num_connectors) {
861 ret = drm_mode_set_config_internal(modeset);
862 if (!ret) {
863 info->var.xoffset = var->xoffset;
864 info->var.yoffset = var->yoffset;
865 }
866 }
867 }
868 drm_modeset_unlock_all(dev);
869 return ret;
870 }
871 EXPORT_SYMBOL(drm_fb_helper_pan_display);
872
873 /*
874 * Allocates the backing storage and sets up the fbdev info structure through
875 * the ->fb_probe callback and then registers the fbdev and sets up the panic
876 * notifier.
877 */
878 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
879 int preferred_bpp)
880 {
881 int ret = 0;
882 int crtc_count = 0;
883 int i;
884 struct fb_info *info;
885 struct drm_fb_helper_surface_size sizes;
886 int gamma_size = 0;
887
888 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
889 sizes.surface_depth = 24;
890 sizes.surface_bpp = 32;
891 sizes.fb_width = (unsigned)-1;
892 sizes.fb_height = (unsigned)-1;
893
894 /* if driver picks 8 or 16 by default use that
895 for both depth/bpp */
896 if (preferred_bpp != sizes.surface_bpp)
897 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
898
899 /* first up get a count of crtcs now in use and new min/maxes width/heights */
900 for (i = 0; i < fb_helper->connector_count; i++) {
901 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
902 struct drm_cmdline_mode *cmdline_mode;
903
904 cmdline_mode = &fb_helper_conn->cmdline_mode;
905
906 if (cmdline_mode->bpp_specified) {
907 switch (cmdline_mode->bpp) {
908 case 8:
909 sizes.surface_depth = sizes.surface_bpp = 8;
910 break;
911 case 15:
912 sizes.surface_depth = 15;
913 sizes.surface_bpp = 16;
914 break;
915 case 16:
916 sizes.surface_depth = sizes.surface_bpp = 16;
917 break;
918 case 24:
919 sizes.surface_depth = sizes.surface_bpp = 24;
920 break;
921 case 32:
922 sizes.surface_depth = 24;
923 sizes.surface_bpp = 32;
924 break;
925 }
926 break;
927 }
928 }
929
930 crtc_count = 0;
931 for (i = 0; i < fb_helper->crtc_count; i++) {
932 struct drm_display_mode *desired_mode;
933 desired_mode = fb_helper->crtc_info[i].desired_mode;
934
935 if (desired_mode) {
936 if (gamma_size == 0)
937 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
938 if (desired_mode->hdisplay < sizes.fb_width)
939 sizes.fb_width = desired_mode->hdisplay;
940 if (desired_mode->vdisplay < sizes.fb_height)
941 sizes.fb_height = desired_mode->vdisplay;
942 if (desired_mode->hdisplay > sizes.surface_width)
943 sizes.surface_width = desired_mode->hdisplay;
944 if (desired_mode->vdisplay > sizes.surface_height)
945 sizes.surface_height = desired_mode->vdisplay;
946 crtc_count++;
947 }
948 }
949
950 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
951 /* hmm everyone went away - assume VGA cable just fell out
952 and will come back later. */
953 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
954 sizes.fb_width = sizes.surface_width = 1024;
955 sizes.fb_height = sizes.surface_height = 768;
956 }
957
958 /* push down into drivers */
959 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
960 if (ret < 0)
961 return ret;
962
963 info = fb_helper->fbdev;
964
965 /*
966 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
967 * events, but at init time drm_setup_crtcs needs to be called before
968 * the fb is allocated (since we need to figure out the desired size of
969 * the fb before we can allocate it ...). Hence we need to fix things up
970 * here again.
971 */
972 for (i = 0; i < fb_helper->crtc_count; i++)
973 if (fb_helper->crtc_info[i].mode_set.num_connectors)
974 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
975
976
977 info->var.pixclock = 0;
978 if (register_framebuffer(info) < 0)
979 return -EINVAL;
980
981 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
982 info->node, info->fix.id);
983
984 /* Switch back to kernel console on panic */
985 /* multi card linked list maybe */
986 if (list_empty(&kernel_fb_helper_list)) {
987 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
988 atomic_notifier_chain_register(&panic_notifier_list,
989 &paniced);
990 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
991 }
992
993 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
994
995 return 0;
996 }
997
998 /**
999 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1000 * @info: fbdev registered by the helper
1001 * @pitch: desired pitch
1002 * @depth: desired depth
1003 *
1004 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1005 * fbdev emulations. Drivers which support acceleration methods which impose
1006 * additional constraints need to set up their own limits.
1007 *
1008 * Drivers should call this (or their equivalent setup code) from their
1009 * ->fb_probe callback.
1010 */
1011 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1012 uint32_t depth)
1013 {
1014 info->fix.type = FB_TYPE_PACKED_PIXELS;
1015 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1016 FB_VISUAL_TRUECOLOR;
1017 info->fix.mmio_start = 0;
1018 info->fix.mmio_len = 0;
1019 info->fix.type_aux = 0;
1020 info->fix.xpanstep = 1; /* doing it in hw */
1021 info->fix.ypanstep = 1; /* doing it in hw */
1022 info->fix.ywrapstep = 0;
1023 info->fix.accel = FB_ACCEL_NONE;
1024 info->fix.type_aux = 0;
1025
1026 info->fix.line_length = pitch;
1027 return;
1028 }
1029 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1030
1031 /**
1032 * drm_fb_helper_fill_var - initalizes variable fbdev information
1033 * @info: fbdev instance to set up
1034 * @fb_helper: fb helper instance to use as template
1035 * @fb_width: desired fb width
1036 * @fb_height: desired fb height
1037 *
1038 * Sets up the variable fbdev metainformation from the given fb helper instance
1039 * and the drm framebuffer allocated in fb_helper->fb.
1040 *
1041 * Drivers should call this (or their equivalent setup code) from their
1042 * ->fb_probe callback after having allocated the fbdev backing
1043 * storage framebuffer.
1044 */
1045 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1046 uint32_t fb_width, uint32_t fb_height)
1047 {
1048 struct drm_framebuffer *fb = fb_helper->fb;
1049 info->pseudo_palette = fb_helper->pseudo_palette;
1050 info->var.xres_virtual = fb->width;
1051 info->var.yres_virtual = fb->height;
1052 info->var.bits_per_pixel = fb->bits_per_pixel;
1053 info->var.accel_flags = FB_ACCELF_TEXT;
1054 info->var.xoffset = 0;
1055 info->var.yoffset = 0;
1056 info->var.activate = FB_ACTIVATE_NOW;
1057 info->var.height = -1;
1058 info->var.width = -1;
1059
1060 switch (fb->depth) {
1061 case 8:
1062 info->var.red.offset = 0;
1063 info->var.green.offset = 0;
1064 info->var.blue.offset = 0;
1065 info->var.red.length = 8; /* 8bit DAC */
1066 info->var.green.length = 8;
1067 info->var.blue.length = 8;
1068 info->var.transp.offset = 0;
1069 info->var.transp.length = 0;
1070 break;
1071 case 15:
1072 info->var.red.offset = 10;
1073 info->var.green.offset = 5;
1074 info->var.blue.offset = 0;
1075 info->var.red.length = 5;
1076 info->var.green.length = 5;
1077 info->var.blue.length = 5;
1078 info->var.transp.offset = 15;
1079 info->var.transp.length = 1;
1080 break;
1081 case 16:
1082 info->var.red.offset = 11;
1083 info->var.green.offset = 5;
1084 info->var.blue.offset = 0;
1085 info->var.red.length = 5;
1086 info->var.green.length = 6;
1087 info->var.blue.length = 5;
1088 info->var.transp.offset = 0;
1089 break;
1090 case 24:
1091 info->var.red.offset = 16;
1092 info->var.green.offset = 8;
1093 info->var.blue.offset = 0;
1094 info->var.red.length = 8;
1095 info->var.green.length = 8;
1096 info->var.blue.length = 8;
1097 info->var.transp.offset = 0;
1098 info->var.transp.length = 0;
1099 break;
1100 case 32:
1101 info->var.red.offset = 16;
1102 info->var.green.offset = 8;
1103 info->var.blue.offset = 0;
1104 info->var.red.length = 8;
1105 info->var.green.length = 8;
1106 info->var.blue.length = 8;
1107 info->var.transp.offset = 24;
1108 info->var.transp.length = 8;
1109 break;
1110 default:
1111 break;
1112 }
1113
1114 info->var.xres = fb_width;
1115 info->var.yres = fb_height;
1116 }
1117 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1118
1119 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1120 uint32_t maxX,
1121 uint32_t maxY)
1122 {
1123 struct drm_connector *connector;
1124 int count = 0;
1125 int i;
1126
1127 for (i = 0; i < fb_helper->connector_count; i++) {
1128 connector = fb_helper->connector_info[i]->connector;
1129 count += connector->funcs->fill_modes(connector, maxX, maxY);
1130 }
1131
1132 return count;
1133 }
1134
1135 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1136 {
1137 struct drm_display_mode *mode;
1138
1139 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1140 if (mode->hdisplay > width ||
1141 mode->vdisplay > height)
1142 continue;
1143 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1144 return mode;
1145 }
1146 return NULL;
1147 }
1148 EXPORT_SYMBOL(drm_has_preferred_mode);
1149
1150 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1151 {
1152 struct drm_cmdline_mode *cmdline_mode;
1153 cmdline_mode = &fb_connector->cmdline_mode;
1154 return cmdline_mode->specified;
1155 }
1156
1157 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1158 int width, int height)
1159 {
1160 struct drm_cmdline_mode *cmdline_mode;
1161 struct drm_display_mode *mode = NULL;
1162
1163 cmdline_mode = &fb_helper_conn->cmdline_mode;
1164 if (cmdline_mode->specified == false)
1165 return mode;
1166
1167 /* attempt to find a matching mode in the list of modes
1168 * we have gotten so far, if not add a CVT mode that conforms
1169 */
1170 if (cmdline_mode->rb || cmdline_mode->margins)
1171 goto create_mode;
1172
1173 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1174 /* check width/height */
1175 if (mode->hdisplay != cmdline_mode->xres ||
1176 mode->vdisplay != cmdline_mode->yres)
1177 continue;
1178
1179 if (cmdline_mode->refresh_specified) {
1180 if (mode->vrefresh != cmdline_mode->refresh)
1181 continue;
1182 }
1183
1184 if (cmdline_mode->interlace) {
1185 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1186 continue;
1187 }
1188 return mode;
1189 }
1190
1191 create_mode:
1192 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1193 cmdline_mode);
1194 list_add(&mode->head, &fb_helper_conn->connector->modes);
1195 return mode;
1196 }
1197 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1198
1199 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1200 {
1201 bool enable;
1202
1203 if (strict)
1204 enable = connector->status == connector_status_connected;
1205 else
1206 enable = connector->status != connector_status_disconnected;
1207
1208 return enable;
1209 }
1210
1211 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1212 bool *enabled)
1213 {
1214 bool any_enabled = false;
1215 struct drm_connector *connector;
1216 int i = 0;
1217
1218 for (i = 0; i < fb_helper->connector_count; i++) {
1219 connector = fb_helper->connector_info[i]->connector;
1220 enabled[i] = drm_connector_enabled(connector, true);
1221 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1222 enabled[i] ? "yes" : "no");
1223 any_enabled |= enabled[i];
1224 }
1225
1226 if (any_enabled)
1227 return;
1228
1229 for (i = 0; i < fb_helper->connector_count; i++) {
1230 connector = fb_helper->connector_info[i]->connector;
1231 enabled[i] = drm_connector_enabled(connector, false);
1232 }
1233 }
1234
1235 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1236 struct drm_display_mode **modes,
1237 bool *enabled, int width, int height)
1238 {
1239 int count, i, j;
1240 bool can_clone = false;
1241 struct drm_fb_helper_connector *fb_helper_conn;
1242 struct drm_display_mode *dmt_mode, *mode;
1243
1244 /* only contemplate cloning in the single crtc case */
1245 if (fb_helper->crtc_count > 1)
1246 return false;
1247
1248 count = 0;
1249 for (i = 0; i < fb_helper->connector_count; i++) {
1250 if (enabled[i])
1251 count++;
1252 }
1253
1254 /* only contemplate cloning if more than one connector is enabled */
1255 if (count <= 1)
1256 return false;
1257
1258 /* check the command line or if nothing common pick 1024x768 */
1259 can_clone = true;
1260 for (i = 0; i < fb_helper->connector_count; i++) {
1261 if (!enabled[i])
1262 continue;
1263 fb_helper_conn = fb_helper->connector_info[i];
1264 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1265 if (!modes[i]) {
1266 can_clone = false;
1267 break;
1268 }
1269 for (j = 0; j < i; j++) {
1270 if (!enabled[j])
1271 continue;
1272 if (!drm_mode_equal(modes[j], modes[i]))
1273 can_clone = false;
1274 }
1275 }
1276
1277 if (can_clone) {
1278 DRM_DEBUG_KMS("can clone using command line\n");
1279 return true;
1280 }
1281
1282 /* try and find a 1024x768 mode on each connector */
1283 can_clone = true;
1284 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1285
1286 for (i = 0; i < fb_helper->connector_count; i++) {
1287
1288 if (!enabled[i])
1289 continue;
1290
1291 fb_helper_conn = fb_helper->connector_info[i];
1292 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1293 if (drm_mode_equal(mode, dmt_mode))
1294 modes[i] = mode;
1295 }
1296 if (!modes[i])
1297 can_clone = false;
1298 }
1299
1300 if (can_clone) {
1301 DRM_DEBUG_KMS("can clone using 1024x768\n");
1302 return true;
1303 }
1304 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1305 return false;
1306 }
1307
1308 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1309 struct drm_display_mode **modes,
1310 bool *enabled, int width, int height)
1311 {
1312 struct drm_fb_helper_connector *fb_helper_conn;
1313 int i;
1314
1315 for (i = 0; i < fb_helper->connector_count; i++) {
1316 fb_helper_conn = fb_helper->connector_info[i];
1317
1318 if (enabled[i] == false)
1319 continue;
1320
1321 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1322 fb_helper_conn->connector->base.id);
1323
1324 /* got for command line mode first */
1325 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1326 if (!modes[i]) {
1327 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1328 fb_helper_conn->connector->base.id);
1329 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1330 }
1331 /* No preferred modes, pick one off the list */
1332 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1333 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1334 break;
1335 }
1336 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1337 "none");
1338 }
1339 return true;
1340 }
1341
1342 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1343 struct drm_fb_helper_crtc **best_crtcs,
1344 struct drm_display_mode **modes,
1345 int n, int width, int height)
1346 {
1347 int c, o;
1348 struct drm_device *dev = fb_helper->dev;
1349 struct drm_connector *connector;
1350 struct drm_connector_helper_funcs *connector_funcs;
1351 struct drm_encoder *encoder;
1352 int my_score, best_score, score;
1353 struct drm_fb_helper_crtc **crtcs, *crtc;
1354 struct drm_fb_helper_connector *fb_helper_conn;
1355
1356 if (n == fb_helper->connector_count)
1357 return 0;
1358
1359 fb_helper_conn = fb_helper->connector_info[n];
1360 connector = fb_helper_conn->connector;
1361
1362 best_crtcs[n] = NULL;
1363 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1364 if (modes[n] == NULL)
1365 return best_score;
1366
1367 crtcs = kzalloc(dev->mode_config.num_connector *
1368 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1369 if (!crtcs)
1370 return best_score;
1371
1372 my_score = 1;
1373 if (connector->status == connector_status_connected)
1374 my_score++;
1375 if (drm_has_cmdline_mode(fb_helper_conn))
1376 my_score++;
1377 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1378 my_score++;
1379
1380 connector_funcs = connector->helper_private;
1381 encoder = connector_funcs->best_encoder(connector);
1382 if (!encoder)
1383 goto out;
1384
1385 /* select a crtc for this connector and then attempt to configure
1386 remaining connectors */
1387 for (c = 0; c < fb_helper->crtc_count; c++) {
1388 crtc = &fb_helper->crtc_info[c];
1389
1390 if ((encoder->possible_crtcs & (1 << c)) == 0)
1391 continue;
1392
1393 for (o = 0; o < n; o++)
1394 if (best_crtcs[o] == crtc)
1395 break;
1396
1397 if (o < n) {
1398 /* ignore cloning unless only a single crtc */
1399 if (fb_helper->crtc_count > 1)
1400 continue;
1401
1402 if (!drm_mode_equal(modes[o], modes[n]))
1403 continue;
1404 }
1405
1406 crtcs[n] = crtc;
1407 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1408 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1409 width, height);
1410 if (score > best_score) {
1411 best_score = score;
1412 memcpy(best_crtcs, crtcs,
1413 dev->mode_config.num_connector *
1414 sizeof(struct drm_fb_helper_crtc *));
1415 }
1416 }
1417 out:
1418 kfree(crtcs);
1419 return best_score;
1420 }
1421
1422 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1423 {
1424 struct drm_device *dev = fb_helper->dev;
1425 struct drm_fb_helper_crtc **crtcs;
1426 struct drm_display_mode **modes;
1427 struct drm_mode_set *modeset;
1428 bool *enabled;
1429 int width, height;
1430 int i;
1431
1432 DRM_DEBUG_KMS("\n");
1433
1434 width = dev->mode_config.max_width;
1435 height = dev->mode_config.max_height;
1436
1437 crtcs = kcalloc(dev->mode_config.num_connector,
1438 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1439 modes = kcalloc(dev->mode_config.num_connector,
1440 sizeof(struct drm_display_mode *), GFP_KERNEL);
1441 enabled = kcalloc(dev->mode_config.num_connector,
1442 sizeof(bool), GFP_KERNEL);
1443 if (!crtcs || !modes || !enabled) {
1444 DRM_ERROR("Memory allocation failed\n");
1445 goto out;
1446 }
1447
1448
1449 drm_enable_connectors(fb_helper, enabled);
1450
1451 if (!(fb_helper->funcs->initial_config &&
1452 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1453 enabled, width, height))) {
1454 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1455 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1456
1457 if (!drm_target_cloned(fb_helper,
1458 modes, enabled, width, height) &&
1459 !drm_target_preferred(fb_helper,
1460 modes, enabled, width, height))
1461 DRM_ERROR("Unable to find initial modes\n");
1462
1463 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1464 width, height);
1465
1466 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1467 }
1468
1469 /* need to set the modesets up here for use later */
1470 /* fill out the connector<->crtc mappings into the modesets */
1471 for (i = 0; i < fb_helper->crtc_count; i++) {
1472 modeset = &fb_helper->crtc_info[i].mode_set;
1473 modeset->num_connectors = 0;
1474 modeset->fb = NULL;
1475 }
1476
1477 for (i = 0; i < fb_helper->connector_count; i++) {
1478 struct drm_display_mode *mode = modes[i];
1479 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1480 modeset = &fb_crtc->mode_set;
1481
1482 if (mode && fb_crtc) {
1483 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1484 mode->name, fb_crtc->mode_set.crtc->base.id);
1485 fb_crtc->desired_mode = mode;
1486 if (modeset->mode)
1487 drm_mode_destroy(dev, modeset->mode);
1488 modeset->mode = drm_mode_duplicate(dev,
1489 fb_crtc->desired_mode);
1490 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1491 modeset->fb = fb_helper->fb;
1492 }
1493 }
1494
1495 /* Clear out any old modes if there are no more connected outputs. */
1496 for (i = 0; i < fb_helper->crtc_count; i++) {
1497 modeset = &fb_helper->crtc_info[i].mode_set;
1498 if (modeset->num_connectors == 0) {
1499 BUG_ON(modeset->fb);
1500 BUG_ON(modeset->num_connectors);
1501 if (modeset->mode)
1502 drm_mode_destroy(dev, modeset->mode);
1503 modeset->mode = NULL;
1504 }
1505 }
1506 out:
1507 kfree(crtcs);
1508 kfree(modes);
1509 kfree(enabled);
1510 }
1511
1512 /**
1513 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1514 * @fb_helper: fb_helper device struct
1515 * @bpp_sel: bpp value to use for the framebuffer configuration
1516 *
1517 * Scans the CRTCs and connectors and tries to put together an initial setup.
1518 * At the moment, this is a cloned configuration across all heads with
1519 * a new framebuffer object as the backing store.
1520 *
1521 * Note that this also registers the fbdev and so allows userspace to call into
1522 * the driver through the fbdev interfaces.
1523 *
1524 * This function will call down into the ->fb_probe callback to let
1525 * the driver allocate and initialize the fbdev info structure and the drm
1526 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1527 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1528 * values for the fbdev info structure.
1529 *
1530 * RETURNS:
1531 * Zero if everything went ok, nonzero otherwise.
1532 */
1533 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1534 {
1535 struct drm_device *dev = fb_helper->dev;
1536 int count = 0;
1537
1538 drm_fb_helper_parse_command_line(fb_helper);
1539
1540 mutex_lock(&dev->mode_config.mutex);
1541 count = drm_fb_helper_probe_connector_modes(fb_helper,
1542 dev->mode_config.max_width,
1543 dev->mode_config.max_height);
1544 mutex_unlock(&dev->mode_config.mutex);
1545 /*
1546 * we shouldn't end up with no modes here.
1547 */
1548 if (count == 0)
1549 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1550
1551 drm_setup_crtcs(fb_helper);
1552
1553 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1554 }
1555 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1556
1557 /**
1558 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1559 * probing all the outputs attached to the fb
1560 * @fb_helper: the drm_fb_helper
1561 *
1562 * Scan the connectors attached to the fb_helper and try to put together a
1563 * setup after *notification of a change in output configuration.
1564 *
1565 * Called at runtime, takes the mode config locks to be able to check/change the
1566 * modeset configuration. Must be run from process context (which usually means
1567 * either the output polling work or a work item launched from the driver's
1568 * hotplug interrupt).
1569 *
1570 * Note that the driver must ensure that this is only called _after_ the fb has
1571 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1572 *
1573 * RETURNS:
1574 * 0 on success and a non-zero error code otherwise.
1575 */
1576 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1577 {
1578 struct drm_device *dev = fb_helper->dev;
1579 u32 max_width, max_height;
1580
1581 if (!fb_helper->fb)
1582 return 0;
1583
1584 mutex_lock(&fb_helper->dev->mode_config.mutex);
1585 if (!drm_fb_helper_is_bound(fb_helper)) {
1586 fb_helper->delayed_hotplug = true;
1587 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1588 return 0;
1589 }
1590 DRM_DEBUG_KMS("\n");
1591
1592 max_width = fb_helper->fb->width;
1593 max_height = fb_helper->fb->height;
1594
1595 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1596 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1597
1598 drm_modeset_lock_all(dev);
1599 drm_setup_crtcs(fb_helper);
1600 drm_modeset_unlock_all(dev);
1601 drm_fb_helper_set_par(fb_helper->fbdev);
1602
1603 return 0;
1604 }
1605 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1606
1607 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1608 * but the module doesn't depend on any fb console symbols. At least
1609 * attempt to load fbcon to avoid leaving the system without a usable console.
1610 */
1611 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1612 static int __init drm_fb_helper_modinit(void)
1613 {
1614 const char *name = "fbcon";
1615 struct module *fbcon;
1616
1617 mutex_lock(&module_mutex);
1618 fbcon = find_module(name);
1619 mutex_unlock(&module_mutex);
1620
1621 if (!fbcon)
1622 request_module_nowait(name);
1623 return 0;
1624 }
1625
1626 module_init(drm_fb_helper_modinit);
1627 #endif
Linux kernel - Deliverables
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