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Linux 3.14
[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->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 drm_plane_force_disable(plane);
295
296 for (i = 0; i < fb_helper->crtc_count; i++) {
297 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
298 struct drm_crtc *crtc = mode_set->crtc;
299 int ret;
300
301 if (crtc->funcs->cursor_set) {
302 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
303 if (ret)
304 error = true;
305 }
306
307 ret = drm_mode_set_config_internal(mode_set);
308 if (ret)
309 error = true;
310 }
311 return error;
312 }
313 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
314
315 /*
316 * restore fbcon display for all kms driver's using this helper, used for sysrq
317 * and panic handling.
318 */
319 static bool drm_fb_helper_force_kernel_mode(void)
320 {
321 bool ret, error = false;
322 struct drm_fb_helper *helper;
323
324 if (list_empty(&kernel_fb_helper_list))
325 return false;
326
327 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
328 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
329 continue;
330
331 ret = drm_fb_helper_restore_fbdev_mode(helper);
332 if (ret)
333 error = true;
334 }
335 return error;
336 }
337
338 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
339 void *panic_str)
340 {
341 /*
342 * It's a waste of time and effort to switch back to text console
343 * if the kernel should reboot before panic messages can be seen.
344 */
345 if (panic_timeout < 0)
346 return 0;
347
348 pr_err("panic occurred, switching back to text console\n");
349 return drm_fb_helper_force_kernel_mode();
350 }
351
352 static struct notifier_block paniced = {
353 .notifier_call = drm_fb_helper_panic,
354 };
355
356 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
357 {
358 struct drm_device *dev = fb_helper->dev;
359 struct drm_crtc *crtc;
360 int bound = 0, crtcs_bound = 0;
361
362 /* Sometimes user space wants everything disabled, so don't steal the
363 * display if there's a master. */
364 if (dev->primary->master)
365 return false;
366
367 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
368 if (crtc->fb)
369 crtcs_bound++;
370 if (crtc->fb == fb_helper->fb)
371 bound++;
372 }
373
374 if (bound < crtcs_bound)
375 return false;
376
377 return true;
378 }
379
380 #ifdef CONFIG_MAGIC_SYSRQ
381 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
382 {
383 bool ret;
384 ret = drm_fb_helper_force_kernel_mode();
385 if (ret == true)
386 DRM_ERROR("Failed to restore crtc configuration\n");
387 }
388 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
389
390 static void drm_fb_helper_sysrq(int dummy1)
391 {
392 schedule_work(&drm_fb_helper_restore_work);
393 }
394
395 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
396 .handler = drm_fb_helper_sysrq,
397 .help_msg = "force-fb(V)",
398 .action_msg = "Restore framebuffer console",
399 };
400 #else
401 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
402 #endif
403
404 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
405 {
406 struct drm_fb_helper *fb_helper = info->par;
407 struct drm_device *dev = fb_helper->dev;
408 struct drm_crtc *crtc;
409 struct drm_connector *connector;
410 int i, j;
411
412 /*
413 * fbdev->blank can be called from irq context in case of a panic.
414 * Since we already have our own special panic handler which will
415 * restore the fbdev console mode completely, just bail out early.
416 */
417 if (oops_in_progress)
418 return;
419
420 /*
421 * For each CRTC in this fb, turn the connectors on/off.
422 */
423 drm_modeset_lock_all(dev);
424 if (!drm_fb_helper_is_bound(fb_helper)) {
425 drm_modeset_unlock_all(dev);
426 return;
427 }
428
429 for (i = 0; i < fb_helper->crtc_count; i++) {
430 crtc = fb_helper->crtc_info[i].mode_set.crtc;
431
432 if (!crtc->enabled)
433 continue;
434
435 /* Walk the connectors & encoders on this fb turning them on/off */
436 for (j = 0; j < fb_helper->connector_count; j++) {
437 connector = fb_helper->connector_info[j]->connector;
438 connector->funcs->dpms(connector, dpms_mode);
439 drm_object_property_set_value(&connector->base,
440 dev->mode_config.dpms_property, dpms_mode);
441 }
442 }
443 drm_modeset_unlock_all(dev);
444 }
445
446 /**
447 * drm_fb_helper_blank - implementation for ->fb_blank
448 * @blank: desired blanking state
449 * @info: fbdev registered by the helper
450 */
451 int drm_fb_helper_blank(int blank, struct fb_info *info)
452 {
453 switch (blank) {
454 /* Display: On; HSync: On, VSync: On */
455 case FB_BLANK_UNBLANK:
456 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
457 break;
458 /* Display: Off; HSync: On, VSync: On */
459 case FB_BLANK_NORMAL:
460 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
461 break;
462 /* Display: Off; HSync: Off, VSync: On */
463 case FB_BLANK_HSYNC_SUSPEND:
464 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
465 break;
466 /* Display: Off; HSync: On, VSync: Off */
467 case FB_BLANK_VSYNC_SUSPEND:
468 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
469 break;
470 /* Display: Off; HSync: Off, VSync: Off */
471 case FB_BLANK_POWERDOWN:
472 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
473 break;
474 }
475 return 0;
476 }
477 EXPORT_SYMBOL(drm_fb_helper_blank);
478
479 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
480 {
481 int i;
482
483 for (i = 0; i < helper->connector_count; i++)
484 kfree(helper->connector_info[i]);
485 kfree(helper->connector_info);
486 for (i = 0; i < helper->crtc_count; i++) {
487 kfree(helper->crtc_info[i].mode_set.connectors);
488 if (helper->crtc_info[i].mode_set.mode)
489 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
490 }
491 kfree(helper->crtc_info);
492 }
493
494 /**
495 * drm_fb_helper_init - initialize a drm_fb_helper structure
496 * @dev: drm device
497 * @fb_helper: driver-allocated fbdev helper structure to initialize
498 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
499 * @max_conn_count: max connector count
500 *
501 * This allocates the structures for the fbdev helper with the given limits.
502 * Note that this won't yet touch the hardware (through the driver interfaces)
503 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
504 * to allow driver writes more control over the exact init sequence.
505 *
506 * Drivers must set fb_helper->funcs before calling
507 * drm_fb_helper_initial_config().
508 *
509 * RETURNS:
510 * Zero if everything went ok, nonzero otherwise.
511 */
512 int drm_fb_helper_init(struct drm_device *dev,
513 struct drm_fb_helper *fb_helper,
514 int crtc_count, int max_conn_count)
515 {
516 struct drm_crtc *crtc;
517 int i;
518
519 fb_helper->dev = dev;
520
521 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
522
523 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
524 if (!fb_helper->crtc_info)
525 return -ENOMEM;
526
527 fb_helper->crtc_count = crtc_count;
528 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
529 if (!fb_helper->connector_info) {
530 kfree(fb_helper->crtc_info);
531 return -ENOMEM;
532 }
533 fb_helper->connector_count = 0;
534
535 for (i = 0; i < crtc_count; i++) {
536 fb_helper->crtc_info[i].mode_set.connectors =
537 kcalloc(max_conn_count,
538 sizeof(struct drm_connector *),
539 GFP_KERNEL);
540
541 if (!fb_helper->crtc_info[i].mode_set.connectors)
542 goto out_free;
543 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
544 }
545
546 i = 0;
547 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
548 fb_helper->crtc_info[i].mode_set.crtc = crtc;
549 i++;
550 }
551
552 return 0;
553 out_free:
554 drm_fb_helper_crtc_free(fb_helper);
555 return -ENOMEM;
556 }
557 EXPORT_SYMBOL(drm_fb_helper_init);
558
559 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
560 {
561 if (!list_empty(&fb_helper->kernel_fb_list)) {
562 list_del(&fb_helper->kernel_fb_list);
563 if (list_empty(&kernel_fb_helper_list)) {
564 pr_info("drm: unregistered panic notifier\n");
565 atomic_notifier_chain_unregister(&panic_notifier_list,
566 &paniced);
567 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
568 }
569 }
570
571 drm_fb_helper_crtc_free(fb_helper);
572
573 }
574 EXPORT_SYMBOL(drm_fb_helper_fini);
575
576 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
577 u16 blue, u16 regno, struct fb_info *info)
578 {
579 struct drm_fb_helper *fb_helper = info->par;
580 struct drm_framebuffer *fb = fb_helper->fb;
581 int pindex;
582
583 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
584 u32 *palette;
585 u32 value;
586 /* place color in psuedopalette */
587 if (regno > 16)
588 return -EINVAL;
589 palette = (u32 *)info->pseudo_palette;
590 red >>= (16 - info->var.red.length);
591 green >>= (16 - info->var.green.length);
592 blue >>= (16 - info->var.blue.length);
593 value = (red << info->var.red.offset) |
594 (green << info->var.green.offset) |
595 (blue << info->var.blue.offset);
596 if (info->var.transp.length > 0) {
597 u32 mask = (1 << info->var.transp.length) - 1;
598 mask <<= info->var.transp.offset;
599 value |= mask;
600 }
601 palette[regno] = value;
602 return 0;
603 }
604
605 /*
606 * The driver really shouldn't advertise pseudo/directcolor
607 * visuals if it can't deal with the palette.
608 */
609 if (WARN_ON(!fb_helper->funcs->gamma_set ||
610 !fb_helper->funcs->gamma_get))
611 return -EINVAL;
612
613 pindex = regno;
614
615 if (fb->bits_per_pixel == 16) {
616 pindex = regno << 3;
617
618 if (fb->depth == 16 && regno > 63)
619 return -EINVAL;
620 if (fb->depth == 15 && regno > 31)
621 return -EINVAL;
622
623 if (fb->depth == 16) {
624 u16 r, g, b;
625 int i;
626 if (regno < 32) {
627 for (i = 0; i < 8; i++)
628 fb_helper->funcs->gamma_set(crtc, red,
629 green, blue, pindex + i);
630 }
631
632 fb_helper->funcs->gamma_get(crtc, &r,
633 &g, &b,
634 pindex >> 1);
635
636 for (i = 0; i < 4; i++)
637 fb_helper->funcs->gamma_set(crtc, r,
638 green, b,
639 (pindex >> 1) + i);
640 }
641 }
642
643 if (fb->depth != 16)
644 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
645 return 0;
646 }
647
648 /**
649 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
650 * @cmap: cmap to set
651 * @info: fbdev registered by the helper
652 */
653 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
654 {
655 struct drm_fb_helper *fb_helper = info->par;
656 struct drm_device *dev = fb_helper->dev;
657 struct drm_crtc_helper_funcs *crtc_funcs;
658 u16 *red, *green, *blue, *transp;
659 struct drm_crtc *crtc;
660 int i, j, rc = 0;
661 int start;
662
663 drm_modeset_lock_all(dev);
664 if (!drm_fb_helper_is_bound(fb_helper)) {
665 drm_modeset_unlock_all(dev);
666 return -EBUSY;
667 }
668
669 for (i = 0; i < fb_helper->crtc_count; i++) {
670 crtc = fb_helper->crtc_info[i].mode_set.crtc;
671 crtc_funcs = crtc->helper_private;
672
673 red = cmap->red;
674 green = cmap->green;
675 blue = cmap->blue;
676 transp = cmap->transp;
677 start = cmap->start;
678
679 for (j = 0; j < cmap->len; j++) {
680 u16 hred, hgreen, hblue, htransp = 0xffff;
681
682 hred = *red++;
683 hgreen = *green++;
684 hblue = *blue++;
685
686 if (transp)
687 htransp = *transp++;
688
689 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
690 if (rc)
691 goto out;
692 }
693 if (crtc_funcs->load_lut)
694 crtc_funcs->load_lut(crtc);
695 }
696 out:
697 drm_modeset_unlock_all(dev);
698 return rc;
699 }
700 EXPORT_SYMBOL(drm_fb_helper_setcmap);
701
702 /**
703 * drm_fb_helper_check_var - implementation for ->fb_check_var
704 * @var: screeninfo to check
705 * @info: fbdev registered by the helper
706 */
707 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
708 struct fb_info *info)
709 {
710 struct drm_fb_helper *fb_helper = info->par;
711 struct drm_framebuffer *fb = fb_helper->fb;
712 int depth;
713
714 if (var->pixclock != 0 || in_dbg_master())
715 return -EINVAL;
716
717 /* Need to resize the fb object !!! */
718 if (var->bits_per_pixel > fb->bits_per_pixel ||
719 var->xres > fb->width || var->yres > fb->height ||
720 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
721 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
722 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
723 var->xres, var->yres, var->bits_per_pixel,
724 var->xres_virtual, var->yres_virtual,
725 fb->width, fb->height, fb->bits_per_pixel);
726 return -EINVAL;
727 }
728
729 switch (var->bits_per_pixel) {
730 case 16:
731 depth = (var->green.length == 6) ? 16 : 15;
732 break;
733 case 32:
734 depth = (var->transp.length > 0) ? 32 : 24;
735 break;
736 default:
737 depth = var->bits_per_pixel;
738 break;
739 }
740
741 switch (depth) {
742 case 8:
743 var->red.offset = 0;
744 var->green.offset = 0;
745 var->blue.offset = 0;
746 var->red.length = 8;
747 var->green.length = 8;
748 var->blue.length = 8;
749 var->transp.length = 0;
750 var->transp.offset = 0;
751 break;
752 case 15:
753 var->red.offset = 10;
754 var->green.offset = 5;
755 var->blue.offset = 0;
756 var->red.length = 5;
757 var->green.length = 5;
758 var->blue.length = 5;
759 var->transp.length = 1;
760 var->transp.offset = 15;
761 break;
762 case 16:
763 var->red.offset = 11;
764 var->green.offset = 5;
765 var->blue.offset = 0;
766 var->red.length = 5;
767 var->green.length = 6;
768 var->blue.length = 5;
769 var->transp.length = 0;
770 var->transp.offset = 0;
771 break;
772 case 24:
773 var->red.offset = 16;
774 var->green.offset = 8;
775 var->blue.offset = 0;
776 var->red.length = 8;
777 var->green.length = 8;
778 var->blue.length = 8;
779 var->transp.length = 0;
780 var->transp.offset = 0;
781 break;
782 case 32:
783 var->red.offset = 16;
784 var->green.offset = 8;
785 var->blue.offset = 0;
786 var->red.length = 8;
787 var->green.length = 8;
788 var->blue.length = 8;
789 var->transp.length = 8;
790 var->transp.offset = 24;
791 break;
792 default:
793 return -EINVAL;
794 }
795 return 0;
796 }
797 EXPORT_SYMBOL(drm_fb_helper_check_var);
798
799 /**
800 * drm_fb_helper_set_par - implementation for ->fb_set_par
801 * @info: fbdev registered by the helper
802 *
803 * This will let fbcon do the mode init and is called at initialization time by
804 * the fbdev core when registering the driver, and later on through the hotplug
805 * callback.
806 */
807 int drm_fb_helper_set_par(struct fb_info *info)
808 {
809 struct drm_fb_helper *fb_helper = info->par;
810 struct drm_device *dev = fb_helper->dev;
811 struct fb_var_screeninfo *var = &info->var;
812 int ret;
813 int i;
814
815 if (var->pixclock != 0) {
816 DRM_ERROR("PIXEL CLOCK SET\n");
817 return -EINVAL;
818 }
819
820 drm_modeset_lock_all(dev);
821 for (i = 0; i < fb_helper->crtc_count; i++) {
822 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
823 if (ret) {
824 drm_modeset_unlock_all(dev);
825 return ret;
826 }
827 }
828 drm_modeset_unlock_all(dev);
829
830 if (fb_helper->delayed_hotplug) {
831 fb_helper->delayed_hotplug = false;
832 drm_fb_helper_hotplug_event(fb_helper);
833 }
834 return 0;
835 }
836 EXPORT_SYMBOL(drm_fb_helper_set_par);
837
838 /**
839 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
840 * @var: updated screen information
841 * @info: fbdev registered by the helper
842 */
843 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
844 struct fb_info *info)
845 {
846 struct drm_fb_helper *fb_helper = info->par;
847 struct drm_device *dev = fb_helper->dev;
848 struct drm_mode_set *modeset;
849 int ret = 0;
850 int i;
851
852 drm_modeset_lock_all(dev);
853 if (!drm_fb_helper_is_bound(fb_helper)) {
854 drm_modeset_unlock_all(dev);
855 return -EBUSY;
856 }
857
858 for (i = 0; i < fb_helper->crtc_count; i++) {
859 modeset = &fb_helper->crtc_info[i].mode_set;
860
861 modeset->x = var->xoffset;
862 modeset->y = var->yoffset;
863
864 if (modeset->num_connectors) {
865 ret = drm_mode_set_config_internal(modeset);
866 if (!ret) {
867 info->var.xoffset = var->xoffset;
868 info->var.yoffset = var->yoffset;
869 }
870 }
871 }
872 drm_modeset_unlock_all(dev);
873 return ret;
874 }
875 EXPORT_SYMBOL(drm_fb_helper_pan_display);
876
877 /*
878 * Allocates the backing storage and sets up the fbdev info structure through
879 * the ->fb_probe callback and then registers the fbdev and sets up the panic
880 * notifier.
881 */
882 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
883 int preferred_bpp)
884 {
885 int ret = 0;
886 int crtc_count = 0;
887 int i;
888 struct fb_info *info;
889 struct drm_fb_helper_surface_size sizes;
890 int gamma_size = 0;
891
892 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
893 sizes.surface_depth = 24;
894 sizes.surface_bpp = 32;
895 sizes.fb_width = (unsigned)-1;
896 sizes.fb_height = (unsigned)-1;
897
898 /* if driver picks 8 or 16 by default use that
899 for both depth/bpp */
900 if (preferred_bpp != sizes.surface_bpp)
901 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
902
903 /* first up get a count of crtcs now in use and new min/maxes width/heights */
904 for (i = 0; i < fb_helper->connector_count; i++) {
905 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
906 struct drm_cmdline_mode *cmdline_mode;
907
908 cmdline_mode = &fb_helper_conn->cmdline_mode;
909
910 if (cmdline_mode->bpp_specified) {
911 switch (cmdline_mode->bpp) {
912 case 8:
913 sizes.surface_depth = sizes.surface_bpp = 8;
914 break;
915 case 15:
916 sizes.surface_depth = 15;
917 sizes.surface_bpp = 16;
918 break;
919 case 16:
920 sizes.surface_depth = sizes.surface_bpp = 16;
921 break;
922 case 24:
923 sizes.surface_depth = sizes.surface_bpp = 24;
924 break;
925 case 32:
926 sizes.surface_depth = 24;
927 sizes.surface_bpp = 32;
928 break;
929 }
930 break;
931 }
932 }
933
934 crtc_count = 0;
935 for (i = 0; i < fb_helper->crtc_count; i++) {
936 struct drm_display_mode *desired_mode;
937 desired_mode = fb_helper->crtc_info[i].desired_mode;
938
939 if (desired_mode) {
940 if (gamma_size == 0)
941 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
942 if (desired_mode->hdisplay < sizes.fb_width)
943 sizes.fb_width = desired_mode->hdisplay;
944 if (desired_mode->vdisplay < sizes.fb_height)
945 sizes.fb_height = desired_mode->vdisplay;
946 if (desired_mode->hdisplay > sizes.surface_width)
947 sizes.surface_width = desired_mode->hdisplay;
948 if (desired_mode->vdisplay > sizes.surface_height)
949 sizes.surface_height = desired_mode->vdisplay;
950 crtc_count++;
951 }
952 }
953
954 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
955 /* hmm everyone went away - assume VGA cable just fell out
956 and will come back later. */
957 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
958 sizes.fb_width = sizes.surface_width = 1024;
959 sizes.fb_height = sizes.surface_height = 768;
960 }
961
962 /* push down into drivers */
963 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
964 if (ret < 0)
965 return ret;
966
967 info = fb_helper->fbdev;
968
969 /*
970 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
971 * events, but at init time drm_setup_crtcs needs to be called before
972 * the fb is allocated (since we need to figure out the desired size of
973 * the fb before we can allocate it ...). Hence we need to fix things up
974 * here again.
975 */
976 for (i = 0; i < fb_helper->crtc_count; i++)
977 if (fb_helper->crtc_info[i].mode_set.num_connectors)
978 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
979
980
981 info->var.pixclock = 0;
982 if (register_framebuffer(info) < 0)
983 return -EINVAL;
984
985 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
986 info->node, info->fix.id);
987
988 /* Switch back to kernel console on panic */
989 /* multi card linked list maybe */
990 if (list_empty(&kernel_fb_helper_list)) {
991 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
992 atomic_notifier_chain_register(&panic_notifier_list,
993 &paniced);
994 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
995 }
996
997 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
998
999 return 0;
1000 }
1001
1002 /**
1003 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1004 * @info: fbdev registered by the helper
1005 * @pitch: desired pitch
1006 * @depth: desired depth
1007 *
1008 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1009 * fbdev emulations. Drivers which support acceleration methods which impose
1010 * additional constraints need to set up their own limits.
1011 *
1012 * Drivers should call this (or their equivalent setup code) from their
1013 * ->fb_probe callback.
1014 */
1015 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1016 uint32_t depth)
1017 {
1018 info->fix.type = FB_TYPE_PACKED_PIXELS;
1019 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1020 FB_VISUAL_TRUECOLOR;
1021 info->fix.mmio_start = 0;
1022 info->fix.mmio_len = 0;
1023 info->fix.type_aux = 0;
1024 info->fix.xpanstep = 1; /* doing it in hw */
1025 info->fix.ypanstep = 1; /* doing it in hw */
1026 info->fix.ywrapstep = 0;
1027 info->fix.accel = FB_ACCEL_NONE;
1028 info->fix.type_aux = 0;
1029
1030 info->fix.line_length = pitch;
1031 return;
1032 }
1033 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1034
1035 /**
1036 * drm_fb_helper_fill_var - initalizes variable fbdev information
1037 * @info: fbdev instance to set up
1038 * @fb_helper: fb helper instance to use as template
1039 * @fb_width: desired fb width
1040 * @fb_height: desired fb height
1041 *
1042 * Sets up the variable fbdev metainformation from the given fb helper instance
1043 * and the drm framebuffer allocated in fb_helper->fb.
1044 *
1045 * Drivers should call this (or their equivalent setup code) from their
1046 * ->fb_probe callback after having allocated the fbdev backing
1047 * storage framebuffer.
1048 */
1049 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1050 uint32_t fb_width, uint32_t fb_height)
1051 {
1052 struct drm_framebuffer *fb = fb_helper->fb;
1053 info->pseudo_palette = fb_helper->pseudo_palette;
1054 info->var.xres_virtual = fb->width;
1055 info->var.yres_virtual = fb->height;
1056 info->var.bits_per_pixel = fb->bits_per_pixel;
1057 info->var.accel_flags = FB_ACCELF_TEXT;
1058 info->var.xoffset = 0;
1059 info->var.yoffset = 0;
1060 info->var.activate = FB_ACTIVATE_NOW;
1061 info->var.height = -1;
1062 info->var.width = -1;
1063
1064 switch (fb->depth) {
1065 case 8:
1066 info->var.red.offset = 0;
1067 info->var.green.offset = 0;
1068 info->var.blue.offset = 0;
1069 info->var.red.length = 8; /* 8bit DAC */
1070 info->var.green.length = 8;
1071 info->var.blue.length = 8;
1072 info->var.transp.offset = 0;
1073 info->var.transp.length = 0;
1074 break;
1075 case 15:
1076 info->var.red.offset = 10;
1077 info->var.green.offset = 5;
1078 info->var.blue.offset = 0;
1079 info->var.red.length = 5;
1080 info->var.green.length = 5;
1081 info->var.blue.length = 5;
1082 info->var.transp.offset = 15;
1083 info->var.transp.length = 1;
1084 break;
1085 case 16:
1086 info->var.red.offset = 11;
1087 info->var.green.offset = 5;
1088 info->var.blue.offset = 0;
1089 info->var.red.length = 5;
1090 info->var.green.length = 6;
1091 info->var.blue.length = 5;
1092 info->var.transp.offset = 0;
1093 break;
1094 case 24:
1095 info->var.red.offset = 16;
1096 info->var.green.offset = 8;
1097 info->var.blue.offset = 0;
1098 info->var.red.length = 8;
1099 info->var.green.length = 8;
1100 info->var.blue.length = 8;
1101 info->var.transp.offset = 0;
1102 info->var.transp.length = 0;
1103 break;
1104 case 32:
1105 info->var.red.offset = 16;
1106 info->var.green.offset = 8;
1107 info->var.blue.offset = 0;
1108 info->var.red.length = 8;
1109 info->var.green.length = 8;
1110 info->var.blue.length = 8;
1111 info->var.transp.offset = 24;
1112 info->var.transp.length = 8;
1113 break;
1114 default:
1115 break;
1116 }
1117
1118 info->var.xres = fb_width;
1119 info->var.yres = fb_height;
1120 }
1121 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1122
1123 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1124 uint32_t maxX,
1125 uint32_t maxY)
1126 {
1127 struct drm_connector *connector;
1128 int count = 0;
1129 int i;
1130
1131 for (i = 0; i < fb_helper->connector_count; i++) {
1132 connector = fb_helper->connector_info[i]->connector;
1133 count += connector->funcs->fill_modes(connector, maxX, maxY);
1134 }
1135
1136 return count;
1137 }
1138
1139 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1140 {
1141 struct drm_display_mode *mode;
1142
1143 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1144 if (drm_mode_width(mode) > width ||
1145 drm_mode_height(mode) > height)
1146 continue;
1147 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1148 return mode;
1149 }
1150 return NULL;
1151 }
1152
1153 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1154 {
1155 struct drm_cmdline_mode *cmdline_mode;
1156 cmdline_mode = &fb_connector->cmdline_mode;
1157 return cmdline_mode->specified;
1158 }
1159
1160 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1161 int width, int height)
1162 {
1163 struct drm_cmdline_mode *cmdline_mode;
1164 struct drm_display_mode *mode = NULL;
1165
1166 cmdline_mode = &fb_helper_conn->cmdline_mode;
1167 if (cmdline_mode->specified == false)
1168 return mode;
1169
1170 /* attempt to find a matching mode in the list of modes
1171 * we have gotten so far, if not add a CVT mode that conforms
1172 */
1173 if (cmdline_mode->rb || cmdline_mode->margins)
1174 goto create_mode;
1175
1176 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1177 /* check width/height */
1178 if (mode->hdisplay != cmdline_mode->xres ||
1179 mode->vdisplay != cmdline_mode->yres)
1180 continue;
1181
1182 if (cmdline_mode->refresh_specified) {
1183 if (mode->vrefresh != cmdline_mode->refresh)
1184 continue;
1185 }
1186
1187 if (cmdline_mode->interlace) {
1188 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1189 continue;
1190 }
1191 return mode;
1192 }
1193
1194 create_mode:
1195 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1196 cmdline_mode);
1197 list_add(&mode->head, &fb_helper_conn->connector->modes);
1198 return mode;
1199 }
1200
1201 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1202 {
1203 bool enable;
1204
1205 if (strict)
1206 enable = connector->status == connector_status_connected;
1207 else
1208 enable = connector->status != connector_status_disconnected;
1209
1210 return enable;
1211 }
1212
1213 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1214 bool *enabled)
1215 {
1216 bool any_enabled = false;
1217 struct drm_connector *connector;
1218 int i = 0;
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, true);
1223 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1224 enabled[i] ? "yes" : "no");
1225 any_enabled |= enabled[i];
1226 }
1227
1228 if (any_enabled)
1229 return;
1230
1231 for (i = 0; i < fb_helper->connector_count; i++) {
1232 connector = fb_helper->connector_info[i]->connector;
1233 enabled[i] = drm_connector_enabled(connector, false);
1234 }
1235 }
1236
1237 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1238 struct drm_display_mode **modes,
1239 bool *enabled, int width, int height)
1240 {
1241 int count, i, j;
1242 bool can_clone = false;
1243 struct drm_fb_helper_connector *fb_helper_conn;
1244 struct drm_display_mode *dmt_mode, *mode;
1245
1246 /* only contemplate cloning in the single crtc case */
1247 if (fb_helper->crtc_count > 1)
1248 return false;
1249
1250 count = 0;
1251 for (i = 0; i < fb_helper->connector_count; i++) {
1252 if (enabled[i])
1253 count++;
1254 }
1255
1256 /* only contemplate cloning if more than one connector is enabled */
1257 if (count <= 1)
1258 return false;
1259
1260 /* check the command line or if nothing common pick 1024x768 */
1261 can_clone = true;
1262 for (i = 0; i < fb_helper->connector_count; i++) {
1263 if (!enabled[i])
1264 continue;
1265 fb_helper_conn = fb_helper->connector_info[i];
1266 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1267 if (!modes[i]) {
1268 can_clone = false;
1269 break;
1270 }
1271 for (j = 0; j < i; j++) {
1272 if (!enabled[j])
1273 continue;
1274 if (!drm_mode_equal(modes[j], modes[i]))
1275 can_clone = false;
1276 }
1277 }
1278
1279 if (can_clone) {
1280 DRM_DEBUG_KMS("can clone using command line\n");
1281 return true;
1282 }
1283
1284 /* try and find a 1024x768 mode on each connector */
1285 can_clone = true;
1286 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1287
1288 for (i = 0; i < fb_helper->connector_count; i++) {
1289
1290 if (!enabled[i])
1291 continue;
1292
1293 fb_helper_conn = fb_helper->connector_info[i];
1294 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1295 if (drm_mode_equal(mode, dmt_mode))
1296 modes[i] = mode;
1297 }
1298 if (!modes[i])
1299 can_clone = false;
1300 }
1301
1302 if (can_clone) {
1303 DRM_DEBUG_KMS("can clone using 1024x768\n");
1304 return true;
1305 }
1306 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1307 return false;
1308 }
1309
1310 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1311 struct drm_display_mode **modes,
1312 bool *enabled, int width, int height)
1313 {
1314 struct drm_fb_helper_connector *fb_helper_conn;
1315 int i;
1316
1317 for (i = 0; i < fb_helper->connector_count; i++) {
1318 fb_helper_conn = fb_helper->connector_info[i];
1319
1320 if (enabled[i] == false)
1321 continue;
1322
1323 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1324 fb_helper_conn->connector->base.id);
1325
1326 /* got for command line mode first */
1327 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1328 if (!modes[i]) {
1329 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1330 fb_helper_conn->connector->base.id);
1331 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1332 }
1333 /* No preferred modes, pick one off the list */
1334 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1335 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1336 break;
1337 }
1338 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1339 "none");
1340 }
1341 return true;
1342 }
1343
1344 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1345 struct drm_fb_helper_crtc **best_crtcs,
1346 struct drm_display_mode **modes,
1347 int n, int width, int height)
1348 {
1349 int c, o;
1350 struct drm_device *dev = fb_helper->dev;
1351 struct drm_connector *connector;
1352 struct drm_connector_helper_funcs *connector_funcs;
1353 struct drm_encoder *encoder;
1354 int my_score, best_score, score;
1355 struct drm_fb_helper_crtc **crtcs, *crtc;
1356 struct drm_fb_helper_connector *fb_helper_conn;
1357
1358 if (n == fb_helper->connector_count)
1359 return 0;
1360
1361 fb_helper_conn = fb_helper->connector_info[n];
1362 connector = fb_helper_conn->connector;
1363
1364 best_crtcs[n] = NULL;
1365 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1366 if (modes[n] == NULL)
1367 return best_score;
1368
1369 crtcs = kzalloc(dev->mode_config.num_connector *
1370 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1371 if (!crtcs)
1372 return best_score;
1373
1374 my_score = 1;
1375 if (connector->status == connector_status_connected)
1376 my_score++;
1377 if (drm_has_cmdline_mode(fb_helper_conn))
1378 my_score++;
1379 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1380 my_score++;
1381
1382 connector_funcs = connector->helper_private;
1383 encoder = connector_funcs->best_encoder(connector);
1384 if (!encoder)
1385 goto out;
1386
1387 /* select a crtc for this connector and then attempt to configure
1388 remaining connectors */
1389 for (c = 0; c < fb_helper->crtc_count; c++) {
1390 crtc = &fb_helper->crtc_info[c];
1391
1392 if ((encoder->possible_crtcs & (1 << c)) == 0)
1393 continue;
1394
1395 for (o = 0; o < n; o++)
1396 if (best_crtcs[o] == crtc)
1397 break;
1398
1399 if (o < n) {
1400 /* ignore cloning unless only a single crtc */
1401 if (fb_helper->crtc_count > 1)
1402 continue;
1403
1404 if (!drm_mode_equal(modes[o], modes[n]))
1405 continue;
1406 }
1407
1408 crtcs[n] = crtc;
1409 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1410 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1411 width, height);
1412 if (score > best_score) {
1413 best_score = score;
1414 memcpy(best_crtcs, crtcs,
1415 dev->mode_config.num_connector *
1416 sizeof(struct drm_fb_helper_crtc *));
1417 }
1418 }
1419 out:
1420 kfree(crtcs);
1421 return best_score;
1422 }
1423
1424 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1425 {
1426 struct drm_device *dev = fb_helper->dev;
1427 struct drm_fb_helper_crtc **crtcs;
1428 struct drm_display_mode **modes;
1429 struct drm_mode_set *modeset;
1430 bool *enabled;
1431 int width, height;
1432 int i;
1433
1434 DRM_DEBUG_KMS("\n");
1435
1436 width = dev->mode_config.max_width;
1437 height = dev->mode_config.max_height;
1438
1439 crtcs = kcalloc(dev->mode_config.num_connector,
1440 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1441 modes = kcalloc(dev->mode_config.num_connector,
1442 sizeof(struct drm_display_mode *), GFP_KERNEL);
1443 enabled = kcalloc(dev->mode_config.num_connector,
1444 sizeof(bool), GFP_KERNEL);
1445 if (!crtcs || !modes || !enabled) {
1446 DRM_ERROR("Memory allocation failed\n");
1447 goto out;
1448 }
1449
1450
1451 drm_enable_connectors(fb_helper, enabled);
1452
1453 if (!(fb_helper->funcs->initial_config &&
1454 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1455 enabled, width, height))) {
1456 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1457 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1458
1459 if (!drm_target_cloned(fb_helper,
1460 modes, enabled, width, height) &&
1461 !drm_target_preferred(fb_helper,
1462 modes, enabled, width, height))
1463 DRM_ERROR("Unable to find initial modes\n");
1464
1465 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1466 width, height);
1467
1468 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1469 }
1470
1471 /* need to set the modesets up here for use later */
1472 /* fill out the connector<->crtc mappings into the modesets */
1473 for (i = 0; i < fb_helper->crtc_count; i++) {
1474 modeset = &fb_helper->crtc_info[i].mode_set;
1475 modeset->num_connectors = 0;
1476 modeset->fb = NULL;
1477 }
1478
1479 for (i = 0; i < fb_helper->connector_count; i++) {
1480 struct drm_display_mode *mode = modes[i];
1481 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1482 modeset = &fb_crtc->mode_set;
1483
1484 if (mode && fb_crtc) {
1485 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1486 mode->name, fb_crtc->mode_set.crtc->base.id);
1487 fb_crtc->desired_mode = mode;
1488 if (modeset->mode)
1489 drm_mode_destroy(dev, modeset->mode);
1490 modeset->mode = drm_mode_duplicate(dev,
1491 fb_crtc->desired_mode);
1492 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1493 modeset->fb = fb_helper->fb;
1494 }
1495 }
1496
1497 /* Clear out any old modes if there are no more connected outputs. */
1498 for (i = 0; i < fb_helper->crtc_count; i++) {
1499 modeset = &fb_helper->crtc_info[i].mode_set;
1500 if (modeset->num_connectors == 0) {
1501 BUG_ON(modeset->fb);
1502 BUG_ON(modeset->num_connectors);
1503 if (modeset->mode)
1504 drm_mode_destroy(dev, modeset->mode);
1505 modeset->mode = NULL;
1506 }
1507 }
1508 out:
1509 kfree(crtcs);
1510 kfree(modes);
1511 kfree(enabled);
1512 }
1513
1514 /**
1515 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1516 * @fb_helper: fb_helper device struct
1517 * @bpp_sel: bpp value to use for the framebuffer configuration
1518 *
1519 * Scans the CRTCs and connectors and tries to put together an initial setup.
1520 * At the moment, this is a cloned configuration across all heads with
1521 * a new framebuffer object as the backing store.
1522 *
1523 * Note that this also registers the fbdev and so allows userspace to call into
1524 * the driver through the fbdev interfaces.
1525 *
1526 * This function will call down into the ->fb_probe callback to let
1527 * the driver allocate and initialize the fbdev info structure and the drm
1528 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1529 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1530 * values for the fbdev info structure.
1531 *
1532 * RETURNS:
1533 * Zero if everything went ok, nonzero otherwise.
1534 */
1535 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1536 {
1537 struct drm_device *dev = fb_helper->dev;
1538 int count = 0;
1539
1540 drm_fb_helper_parse_command_line(fb_helper);
1541
1542 count = drm_fb_helper_probe_connector_modes(fb_helper,
1543 dev->mode_config.max_width,
1544 dev->mode_config.max_height);
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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