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drm: Remove unused variable in drm_pick_crtcs()
[deliverable/linux.git] / drivers / gpu / drm / drm_fb_helper.c
1 /*
2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 *
6 * DRM framebuffer helper functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
35 #include <linux/fb.h>
36 #include <linux/module.h>
37 #include <drm/drmP.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
41
42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
43 MODULE_DESCRIPTION("DRM KMS helper");
44 MODULE_LICENSE("GPL and additional rights");
45
46 static LIST_HEAD(kernel_fb_helper_list);
47
48 /**
49 * DOC: fbdev helpers
50 *
51 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
52 * mode setting driver. They can be used mostly independantely from the crtc
53 * helper functions used by many drivers to implement the kernel mode setting
54 * interfaces.
55 *
56 * Initialization is done as a three-step process with drm_fb_helper_init(),
57 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
58 * Drivers with fancier requirements than the default beheviour can override the
59 * second step with their own code. Teardown is done with drm_fb_helper_fini().
60 *
61 * At runtime drivers should restore the fbdev console by calling
62 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
63 * should also notify the fb helper code from updates to the output
64 * configuration by calling drm_fb_helper_hotplug_event(). For easier
65 * integration with the output polling code in drm_crtc_helper.c the modeset
66 * code proves a ->output_poll_changed callback.
67 *
68 * All other functions exported by the fb helper library can be used to
69 * implement the fbdev driver interface by the driver.
70 */
71
72 /**
73 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
74 * emulation helper
75 * @fb_helper: fbdev initialized with drm_fb_helper_init
76 *
77 * This functions adds all the available connectors for use with the given
78 * fb_helper. This is a separate step to allow drivers to freely assign
79 * connectors to the fbdev, e.g. if some are reserved for special purposes or
80 * not adequate to be used for the fbcon.
81 *
82 * Since this is part of the initial setup before the fbdev is published, no
83 * locking is required.
84 */
85 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
86 {
87 struct drm_device *dev = fb_helper->dev;
88 struct drm_connector *connector;
89 int i;
90
91 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
92 struct drm_fb_helper_connector *fb_helper_connector;
93
94 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
95 if (!fb_helper_connector)
96 goto fail;
97
98 fb_helper_connector->connector = connector;
99 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
100 }
101 return 0;
102 fail:
103 for (i = 0; i < fb_helper->connector_count; i++) {
104 kfree(fb_helper->connector_info[i]);
105 fb_helper->connector_info[i] = NULL;
106 }
107 fb_helper->connector_count = 0;
108 return -ENOMEM;
109 }
110 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
111
112 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
113 {
114 struct drm_fb_helper_connector *fb_helper_conn;
115 int i;
116
117 for (i = 0; i < fb_helper->connector_count; i++) {
118 struct drm_cmdline_mode *mode;
119 struct drm_connector *connector;
120 char *option = NULL;
121
122 fb_helper_conn = fb_helper->connector_info[i];
123 connector = fb_helper_conn->connector;
124 mode = &fb_helper_conn->cmdline_mode;
125
126 /* do something on return - turn off connector maybe */
127 if (fb_get_options(drm_get_connector_name(connector), &option))
128 continue;
129
130 if (drm_mode_parse_command_line_for_connector(option,
131 connector,
132 mode)) {
133 if (mode->force) {
134 const char *s;
135 switch (mode->force) {
136 case DRM_FORCE_OFF:
137 s = "OFF";
138 break;
139 case DRM_FORCE_ON_DIGITAL:
140 s = "ON - dig";
141 break;
142 default:
143 case DRM_FORCE_ON:
144 s = "ON";
145 break;
146 }
147
148 DRM_INFO("forcing %s connector %s\n",
149 drm_get_connector_name(connector), s);
150 connector->force = mode->force;
151 }
152
153 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
154 drm_get_connector_name(connector),
155 mode->xres, mode->yres,
156 mode->refresh_specified ? mode->refresh : 60,
157 mode->rb ? " reduced blanking" : "",
158 mode->margins ? " with margins" : "",
159 mode->interlace ? " interlaced" : "");
160 }
161
162 }
163 return 0;
164 }
165
166 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
167 {
168 uint16_t *r_base, *g_base, *b_base;
169 int i;
170
171 if (helper->funcs->gamma_get == NULL)
172 return;
173
174 r_base = crtc->gamma_store;
175 g_base = r_base + crtc->gamma_size;
176 b_base = g_base + crtc->gamma_size;
177
178 for (i = 0; i < crtc->gamma_size; i++)
179 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
180 }
181
182 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
183 {
184 uint16_t *r_base, *g_base, *b_base;
185
186 if (crtc->funcs->gamma_set == NULL)
187 return;
188
189 r_base = crtc->gamma_store;
190 g_base = r_base + crtc->gamma_size;
191 b_base = g_base + crtc->gamma_size;
192
193 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
194 }
195
196 /**
197 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
198 * @info: fbdev registered by the helper
199 */
200 int drm_fb_helper_debug_enter(struct fb_info *info)
201 {
202 struct drm_fb_helper *helper = info->par;
203 struct drm_crtc_helper_funcs *funcs;
204 int i;
205
206 if (list_empty(&kernel_fb_helper_list))
207 return false;
208
209 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
210 for (i = 0; i < helper->crtc_count; i++) {
211 struct drm_mode_set *mode_set =
212 &helper->crtc_info[i].mode_set;
213
214 if (!mode_set->crtc->enabled)
215 continue;
216
217 funcs = mode_set->crtc->helper_private;
218 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
219 funcs->mode_set_base_atomic(mode_set->crtc,
220 mode_set->fb,
221 mode_set->x,
222 mode_set->y,
223 ENTER_ATOMIC_MODE_SET);
224 }
225 }
226
227 return 0;
228 }
229 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
230
231 /* Find the real fb for a given fb helper CRTC */
232 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
233 {
234 struct drm_device *dev = crtc->dev;
235 struct drm_crtc *c;
236
237 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
238 if (crtc->base.id == c->base.id)
239 return c->fb;
240 }
241
242 return NULL;
243 }
244
245 /**
246 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
247 * @info: fbdev registered by the helper
248 */
249 int drm_fb_helper_debug_leave(struct fb_info *info)
250 {
251 struct drm_fb_helper *helper = info->par;
252 struct drm_crtc *crtc;
253 struct drm_crtc_helper_funcs *funcs;
254 struct drm_framebuffer *fb;
255 int i;
256
257 for (i = 0; i < helper->crtc_count; i++) {
258 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
259 crtc = mode_set->crtc;
260 funcs = crtc->helper_private;
261 fb = drm_mode_config_fb(crtc);
262
263 if (!crtc->enabled)
264 continue;
265
266 if (!fb) {
267 DRM_ERROR("no fb to restore??\n");
268 continue;
269 }
270
271 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
272 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
273 crtc->y, LEAVE_ATOMIC_MODE_SET);
274 }
275
276 return 0;
277 }
278 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
279
280 /**
281 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
282 * @fb_helper: fbcon to restore
283 *
284 * This should be called from driver's drm ->lastclose callback
285 * when implementing an fbcon on top of kms using this helper. This ensures that
286 * the user isn't greeted with a black screen when e.g. X dies.
287 */
288 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
289 {
290 struct drm_device *dev = fb_helper->dev;
291 struct drm_plane *plane;
292 bool error = false;
293 int i;
294
295 drm_warn_on_modeset_not_all_locked(dev);
296
297 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
298 drm_plane_force_disable(plane);
299
300 for (i = 0; i < fb_helper->crtc_count; i++) {
301 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
302 struct drm_crtc *crtc = mode_set->crtc;
303 int ret;
304
305 if (crtc->funcs->cursor_set) {
306 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
307 if (ret)
308 error = true;
309 }
310
311 ret = drm_mode_set_config_internal(mode_set);
312 if (ret)
313 error = true;
314 }
315 return error;
316 }
317 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
318
319 /*
320 * restore fbcon display for all kms driver's using this helper, used for sysrq
321 * and panic handling.
322 */
323 static bool drm_fb_helper_force_kernel_mode(void)
324 {
325 bool ret, error = false;
326 struct drm_fb_helper *helper;
327
328 if (list_empty(&kernel_fb_helper_list))
329 return false;
330
331 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
332 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
333 continue;
334
335 ret = drm_fb_helper_restore_fbdev_mode(helper);
336 if (ret)
337 error = true;
338 }
339 return error;
340 }
341
342 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
343 void *panic_str)
344 {
345 /*
346 * It's a waste of time and effort to switch back to text console
347 * if the kernel should reboot before panic messages can be seen.
348 */
349 if (panic_timeout < 0)
350 return 0;
351
352 pr_err("panic occurred, switching back to text console\n");
353 return drm_fb_helper_force_kernel_mode();
354 }
355
356 static struct notifier_block paniced = {
357 .notifier_call = drm_fb_helper_panic,
358 };
359
360 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
361 {
362 struct drm_device *dev = fb_helper->dev;
363 struct drm_crtc *crtc;
364 int bound = 0, crtcs_bound = 0;
365
366 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
367 if (crtc->fb)
368 crtcs_bound++;
369 if (crtc->fb == fb_helper->fb)
370 bound++;
371 }
372
373 if (bound < crtcs_bound)
374 return false;
375 return true;
376 }
377
378 #ifdef CONFIG_MAGIC_SYSRQ
379 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
380 {
381 bool ret;
382 ret = drm_fb_helper_force_kernel_mode();
383 if (ret == true)
384 DRM_ERROR("Failed to restore crtc configuration\n");
385 }
386 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
387
388 static void drm_fb_helper_sysrq(int dummy1)
389 {
390 schedule_work(&drm_fb_helper_restore_work);
391 }
392
393 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
394 .handler = drm_fb_helper_sysrq,
395 .help_msg = "force-fb(V)",
396 .action_msg = "Restore framebuffer console",
397 };
398 #else
399 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
400 #endif
401
402 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
403 {
404 struct drm_fb_helper *fb_helper = info->par;
405 struct drm_device *dev = fb_helper->dev;
406 struct drm_crtc *crtc;
407 struct drm_connector *connector;
408 int i, j;
409
410 /*
411 * fbdev->blank can be called from irq context in case of a panic.
412 * Since we already have our own special panic handler which will
413 * restore the fbdev console mode completely, just bail out early.
414 */
415 if (oops_in_progress)
416 return;
417
418 /*
419 * fbdev->blank can be called from irq context in case of a panic.
420 * Since we already have our own special panic handler which will
421 * restore the fbdev console mode completely, just bail out early.
422 */
423 if (oops_in_progress)
424 return;
425
426 /*
427 * For each CRTC in this fb, turn the connectors on/off.
428 */
429 drm_modeset_lock_all(dev);
430 if (!drm_fb_helper_is_bound(fb_helper)) {
431 drm_modeset_unlock_all(dev);
432 return;
433 }
434
435 for (i = 0; i < fb_helper->crtc_count; i++) {
436 crtc = fb_helper->crtc_info[i].mode_set.crtc;
437
438 if (!crtc->enabled)
439 continue;
440
441 /* Walk the connectors & encoders on this fb turning them on/off */
442 for (j = 0; j < fb_helper->connector_count; j++) {
443 connector = fb_helper->connector_info[j]->connector;
444 connector->funcs->dpms(connector, dpms_mode);
445 drm_object_property_set_value(&connector->base,
446 dev->mode_config.dpms_property, dpms_mode);
447 }
448 }
449 drm_modeset_unlock_all(dev);
450 }
451
452 /**
453 * drm_fb_helper_blank - implementation for ->fb_blank
454 * @blank: desired blanking state
455 * @info: fbdev registered by the helper
456 */
457 int drm_fb_helper_blank(int blank, struct fb_info *info)
458 {
459 switch (blank) {
460 /* Display: On; HSync: On, VSync: On */
461 case FB_BLANK_UNBLANK:
462 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
463 break;
464 /* Display: Off; HSync: On, VSync: On */
465 case FB_BLANK_NORMAL:
466 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
467 break;
468 /* Display: Off; HSync: Off, VSync: On */
469 case FB_BLANK_HSYNC_SUSPEND:
470 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
471 break;
472 /* Display: Off; HSync: On, VSync: Off */
473 case FB_BLANK_VSYNC_SUSPEND:
474 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
475 break;
476 /* Display: Off; HSync: Off, VSync: Off */
477 case FB_BLANK_POWERDOWN:
478 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
479 break;
480 }
481 return 0;
482 }
483 EXPORT_SYMBOL(drm_fb_helper_blank);
484
485 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
486 {
487 int i;
488
489 for (i = 0; i < helper->connector_count; i++)
490 kfree(helper->connector_info[i]);
491 kfree(helper->connector_info);
492 for (i = 0; i < helper->crtc_count; i++) {
493 kfree(helper->crtc_info[i].mode_set.connectors);
494 if (helper->crtc_info[i].mode_set.mode)
495 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
496 }
497 kfree(helper->crtc_info);
498 }
499
500 /**
501 * drm_fb_helper_init - initialize a drm_fb_helper structure
502 * @dev: drm device
503 * @fb_helper: driver-allocated fbdev helper structure to initialize
504 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
505 * @max_conn_count: max connector count
506 *
507 * This allocates the structures for the fbdev helper with the given limits.
508 * Note that this won't yet touch the hardware (through the driver interfaces)
509 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
510 * to allow driver writes more control over the exact init sequence.
511 *
512 * Drivers must set fb_helper->funcs before calling
513 * drm_fb_helper_initial_config().
514 *
515 * RETURNS:
516 * Zero if everything went ok, nonzero otherwise.
517 */
518 int drm_fb_helper_init(struct drm_device *dev,
519 struct drm_fb_helper *fb_helper,
520 int crtc_count, int max_conn_count)
521 {
522 struct drm_crtc *crtc;
523 int i;
524
525 fb_helper->dev = dev;
526
527 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
528
529 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
530 if (!fb_helper->crtc_info)
531 return -ENOMEM;
532
533 fb_helper->crtc_count = crtc_count;
534 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
535 if (!fb_helper->connector_info) {
536 kfree(fb_helper->crtc_info);
537 return -ENOMEM;
538 }
539 fb_helper->connector_count = 0;
540
541 for (i = 0; i < crtc_count; i++) {
542 fb_helper->crtc_info[i].mode_set.connectors =
543 kcalloc(max_conn_count,
544 sizeof(struct drm_connector *),
545 GFP_KERNEL);
546
547 if (!fb_helper->crtc_info[i].mode_set.connectors)
548 goto out_free;
549 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
550 }
551
552 i = 0;
553 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
554 fb_helper->crtc_info[i].mode_set.crtc = crtc;
555 i++;
556 }
557
558 return 0;
559 out_free:
560 drm_fb_helper_crtc_free(fb_helper);
561 return -ENOMEM;
562 }
563 EXPORT_SYMBOL(drm_fb_helper_init);
564
565 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
566 {
567 if (!list_empty(&fb_helper->kernel_fb_list)) {
568 list_del(&fb_helper->kernel_fb_list);
569 if (list_empty(&kernel_fb_helper_list)) {
570 pr_info("drm: unregistered panic notifier\n");
571 atomic_notifier_chain_unregister(&panic_notifier_list,
572 &paniced);
573 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
574 }
575 }
576
577 drm_fb_helper_crtc_free(fb_helper);
578
579 }
580 EXPORT_SYMBOL(drm_fb_helper_fini);
581
582 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
583 u16 blue, u16 regno, struct fb_info *info)
584 {
585 struct drm_fb_helper *fb_helper = info->par;
586 struct drm_framebuffer *fb = fb_helper->fb;
587 int pindex;
588
589 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
590 u32 *palette;
591 u32 value;
592 /* place color in psuedopalette */
593 if (regno > 16)
594 return -EINVAL;
595 palette = (u32 *)info->pseudo_palette;
596 red >>= (16 - info->var.red.length);
597 green >>= (16 - info->var.green.length);
598 blue >>= (16 - info->var.blue.length);
599 value = (red << info->var.red.offset) |
600 (green << info->var.green.offset) |
601 (blue << info->var.blue.offset);
602 if (info->var.transp.length > 0) {
603 u32 mask = (1 << info->var.transp.length) - 1;
604 mask <<= info->var.transp.offset;
605 value |= mask;
606 }
607 palette[regno] = value;
608 return 0;
609 }
610
611 /*
612 * The driver really shouldn't advertise pseudo/directcolor
613 * visuals if it can't deal with the palette.
614 */
615 if (WARN_ON(!fb_helper->funcs->gamma_set ||
616 !fb_helper->funcs->gamma_get))
617 return -EINVAL;
618
619 pindex = regno;
620
621 if (fb->bits_per_pixel == 16) {
622 pindex = regno << 3;
623
624 if (fb->depth == 16 && regno > 63)
625 return -EINVAL;
626 if (fb->depth == 15 && regno > 31)
627 return -EINVAL;
628
629 if (fb->depth == 16) {
630 u16 r, g, b;
631 int i;
632 if (regno < 32) {
633 for (i = 0; i < 8; i++)
634 fb_helper->funcs->gamma_set(crtc, red,
635 green, blue, pindex + i);
636 }
637
638 fb_helper->funcs->gamma_get(crtc, &r,
639 &g, &b,
640 pindex >> 1);
641
642 for (i = 0; i < 4; i++)
643 fb_helper->funcs->gamma_set(crtc, r,
644 green, b,
645 (pindex >> 1) + i);
646 }
647 }
648
649 if (fb->depth != 16)
650 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
651 return 0;
652 }
653
654 /**
655 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
656 * @cmap: cmap to set
657 * @info: fbdev registered by the helper
658 */
659 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
660 {
661 struct drm_fb_helper *fb_helper = info->par;
662 struct drm_device *dev = fb_helper->dev;
663 struct drm_crtc_helper_funcs *crtc_funcs;
664 u16 *red, *green, *blue, *transp;
665 struct drm_crtc *crtc;
666 int i, j, rc = 0;
667 int start;
668
669 drm_modeset_lock_all(dev);
670 if (!drm_fb_helper_is_bound(fb_helper)) {
671 drm_modeset_unlock_all(dev);
672 return -EBUSY;
673 }
674
675 for (i = 0; i < fb_helper->crtc_count; i++) {
676 crtc = fb_helper->crtc_info[i].mode_set.crtc;
677 crtc_funcs = crtc->helper_private;
678
679 red = cmap->red;
680 green = cmap->green;
681 blue = cmap->blue;
682 transp = cmap->transp;
683 start = cmap->start;
684
685 for (j = 0; j < cmap->len; j++) {
686 u16 hred, hgreen, hblue, htransp = 0xffff;
687
688 hred = *red++;
689 hgreen = *green++;
690 hblue = *blue++;
691
692 if (transp)
693 htransp = *transp++;
694
695 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
696 if (rc)
697 goto out;
698 }
699 if (crtc_funcs->load_lut)
700 crtc_funcs->load_lut(crtc);
701 }
702 out:
703 drm_modeset_unlock_all(dev);
704 return rc;
705 }
706 EXPORT_SYMBOL(drm_fb_helper_setcmap);
707
708 /**
709 * drm_fb_helper_check_var - implementation for ->fb_check_var
710 * @var: screeninfo to check
711 * @info: fbdev registered by the helper
712 */
713 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
714 struct fb_info *info)
715 {
716 struct drm_fb_helper *fb_helper = info->par;
717 struct drm_framebuffer *fb = fb_helper->fb;
718 int depth;
719
720 if (var->pixclock != 0 || in_dbg_master())
721 return -EINVAL;
722
723 /* Need to resize the fb object !!! */
724 if (var->bits_per_pixel > fb->bits_per_pixel ||
725 var->xres > fb->width || var->yres > fb->height ||
726 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
727 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
728 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
729 var->xres, var->yres, var->bits_per_pixel,
730 var->xres_virtual, var->yres_virtual,
731 fb->width, fb->height, fb->bits_per_pixel);
732 return -EINVAL;
733 }
734
735 switch (var->bits_per_pixel) {
736 case 16:
737 depth = (var->green.length == 6) ? 16 : 15;
738 break;
739 case 32:
740 depth = (var->transp.length > 0) ? 32 : 24;
741 break;
742 default:
743 depth = var->bits_per_pixel;
744 break;
745 }
746
747 switch (depth) {
748 case 8:
749 var->red.offset = 0;
750 var->green.offset = 0;
751 var->blue.offset = 0;
752 var->red.length = 8;
753 var->green.length = 8;
754 var->blue.length = 8;
755 var->transp.length = 0;
756 var->transp.offset = 0;
757 break;
758 case 15:
759 var->red.offset = 10;
760 var->green.offset = 5;
761 var->blue.offset = 0;
762 var->red.length = 5;
763 var->green.length = 5;
764 var->blue.length = 5;
765 var->transp.length = 1;
766 var->transp.offset = 15;
767 break;
768 case 16:
769 var->red.offset = 11;
770 var->green.offset = 5;
771 var->blue.offset = 0;
772 var->red.length = 5;
773 var->green.length = 6;
774 var->blue.length = 5;
775 var->transp.length = 0;
776 var->transp.offset = 0;
777 break;
778 case 24:
779 var->red.offset = 16;
780 var->green.offset = 8;
781 var->blue.offset = 0;
782 var->red.length = 8;
783 var->green.length = 8;
784 var->blue.length = 8;
785 var->transp.length = 0;
786 var->transp.offset = 0;
787 break;
788 case 32:
789 var->red.offset = 16;
790 var->green.offset = 8;
791 var->blue.offset = 0;
792 var->red.length = 8;
793 var->green.length = 8;
794 var->blue.length = 8;
795 var->transp.length = 8;
796 var->transp.offset = 24;
797 break;
798 default:
799 return -EINVAL;
800 }
801 return 0;
802 }
803 EXPORT_SYMBOL(drm_fb_helper_check_var);
804
805 /**
806 * drm_fb_helper_set_par - implementation for ->fb_set_par
807 * @info: fbdev registered by the helper
808 *
809 * This will let fbcon do the mode init and is called at initialization time by
810 * the fbdev core when registering the driver, and later on through the hotplug
811 * callback.
812 */
813 int drm_fb_helper_set_par(struct fb_info *info)
814 {
815 struct drm_fb_helper *fb_helper = info->par;
816 struct drm_device *dev = fb_helper->dev;
817 struct fb_var_screeninfo *var = &info->var;
818 int ret;
819 int i;
820
821 if (var->pixclock != 0) {
822 DRM_ERROR("PIXEL CLOCK SET\n");
823 return -EINVAL;
824 }
825
826 drm_modeset_lock_all(dev);
827 for (i = 0; i < fb_helper->crtc_count; i++) {
828 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
829 if (ret) {
830 drm_modeset_unlock_all(dev);
831 return ret;
832 }
833 }
834 drm_modeset_unlock_all(dev);
835
836 if (fb_helper->delayed_hotplug) {
837 fb_helper->delayed_hotplug = false;
838 drm_fb_helper_hotplug_event(fb_helper);
839 }
840 return 0;
841 }
842 EXPORT_SYMBOL(drm_fb_helper_set_par);
843
844 /**
845 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
846 * @var: updated screen information
847 * @info: fbdev registered by the helper
848 */
849 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
850 struct fb_info *info)
851 {
852 struct drm_fb_helper *fb_helper = info->par;
853 struct drm_device *dev = fb_helper->dev;
854 struct drm_mode_set *modeset;
855 int ret = 0;
856 int i;
857
858 drm_modeset_lock_all(dev);
859 if (!drm_fb_helper_is_bound(fb_helper)) {
860 drm_modeset_unlock_all(dev);
861 return -EBUSY;
862 }
863
864 for (i = 0; i < fb_helper->crtc_count; i++) {
865 modeset = &fb_helper->crtc_info[i].mode_set;
866
867 modeset->x = var->xoffset;
868 modeset->y = var->yoffset;
869
870 if (modeset->num_connectors) {
871 ret = drm_mode_set_config_internal(modeset);
872 if (!ret) {
873 info->var.xoffset = var->xoffset;
874 info->var.yoffset = var->yoffset;
875 }
876 }
877 }
878 drm_modeset_unlock_all(dev);
879 return ret;
880 }
881 EXPORT_SYMBOL(drm_fb_helper_pan_display);
882
883 /*
884 * Allocates the backing storage and sets up the fbdev info structure through
885 * the ->fb_probe callback and then registers the fbdev and sets up the panic
886 * notifier.
887 */
888 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
889 int preferred_bpp)
890 {
891 int ret = 0;
892 int crtc_count = 0;
893 int i;
894 struct fb_info *info;
895 struct drm_fb_helper_surface_size sizes;
896 int gamma_size = 0;
897
898 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
899 sizes.surface_depth = 24;
900 sizes.surface_bpp = 32;
901 sizes.fb_width = (unsigned)-1;
902 sizes.fb_height = (unsigned)-1;
903
904 /* if driver picks 8 or 16 by default use that
905 for both depth/bpp */
906 if (preferred_bpp != sizes.surface_bpp)
907 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
908
909 /* first up get a count of crtcs now in use and new min/maxes width/heights */
910 for (i = 0; i < fb_helper->connector_count; i++) {
911 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
912 struct drm_cmdline_mode *cmdline_mode;
913
914 cmdline_mode = &fb_helper_conn->cmdline_mode;
915
916 if (cmdline_mode->bpp_specified) {
917 switch (cmdline_mode->bpp) {
918 case 8:
919 sizes.surface_depth = sizes.surface_bpp = 8;
920 break;
921 case 15:
922 sizes.surface_depth = 15;
923 sizes.surface_bpp = 16;
924 break;
925 case 16:
926 sizes.surface_depth = sizes.surface_bpp = 16;
927 break;
928 case 24:
929 sizes.surface_depth = sizes.surface_bpp = 24;
930 break;
931 case 32:
932 sizes.surface_depth = 24;
933 sizes.surface_bpp = 32;
934 break;
935 }
936 break;
937 }
938 }
939
940 crtc_count = 0;
941 for (i = 0; i < fb_helper->crtc_count; i++) {
942 struct drm_display_mode *desired_mode;
943 desired_mode = fb_helper->crtc_info[i].desired_mode;
944
945 if (desired_mode) {
946 if (gamma_size == 0)
947 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
948 if (desired_mode->hdisplay < sizes.fb_width)
949 sizes.fb_width = desired_mode->hdisplay;
950 if (desired_mode->vdisplay < sizes.fb_height)
951 sizes.fb_height = desired_mode->vdisplay;
952 if (desired_mode->hdisplay > sizes.surface_width)
953 sizes.surface_width = desired_mode->hdisplay;
954 if (desired_mode->vdisplay > sizes.surface_height)
955 sizes.surface_height = desired_mode->vdisplay;
956 crtc_count++;
957 }
958 }
959
960 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
961 /* hmm everyone went away - assume VGA cable just fell out
962 and will come back later. */
963 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
964 sizes.fb_width = sizes.surface_width = 1024;
965 sizes.fb_height = sizes.surface_height = 768;
966 }
967
968 /* push down into drivers */
969 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
970 if (ret < 0)
971 return ret;
972
973 info = fb_helper->fbdev;
974
975 /*
976 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
977 * events, but at init time drm_setup_crtcs needs to be called before
978 * the fb is allocated (since we need to figure out the desired size of
979 * the fb before we can allocate it ...). Hence we need to fix things up
980 * here again.
981 */
982 for (i = 0; i < fb_helper->crtc_count; i++)
983 if (fb_helper->crtc_info[i].mode_set.num_connectors)
984 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
985
986
987 info->var.pixclock = 0;
988 if (register_framebuffer(info) < 0)
989 return -EINVAL;
990
991 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
992 info->node, info->fix.id);
993
994 /* Switch back to kernel console on panic */
995 /* multi card linked list maybe */
996 if (list_empty(&kernel_fb_helper_list)) {
997 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
998 atomic_notifier_chain_register(&panic_notifier_list,
999 &paniced);
1000 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1001 }
1002
1003 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1004
1005 return 0;
1006 }
1007
1008 /**
1009 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1010 * @info: fbdev registered by the helper
1011 * @pitch: desired pitch
1012 * @depth: desired depth
1013 *
1014 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1015 * fbdev emulations. Drivers which support acceleration methods which impose
1016 * additional constraints need to set up their own limits.
1017 *
1018 * Drivers should call this (or their equivalent setup code) from their
1019 * ->fb_probe callback.
1020 */
1021 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1022 uint32_t depth)
1023 {
1024 info->fix.type = FB_TYPE_PACKED_PIXELS;
1025 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1026 FB_VISUAL_TRUECOLOR;
1027 info->fix.mmio_start = 0;
1028 info->fix.mmio_len = 0;
1029 info->fix.type_aux = 0;
1030 info->fix.xpanstep = 1; /* doing it in hw */
1031 info->fix.ypanstep = 1; /* doing it in hw */
1032 info->fix.ywrapstep = 0;
1033 info->fix.accel = FB_ACCEL_NONE;
1034 info->fix.type_aux = 0;
1035
1036 info->fix.line_length = pitch;
1037 return;
1038 }
1039 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1040
1041 /**
1042 * drm_fb_helper_fill_var - initalizes variable fbdev information
1043 * @info: fbdev instance to set up
1044 * @fb_helper: fb helper instance to use as template
1045 * @fb_width: desired fb width
1046 * @fb_height: desired fb height
1047 *
1048 * Sets up the variable fbdev metainformation from the given fb helper instance
1049 * and the drm framebuffer allocated in fb_helper->fb.
1050 *
1051 * Drivers should call this (or their equivalent setup code) from their
1052 * ->fb_probe callback after having allocated the fbdev backing
1053 * storage framebuffer.
1054 */
1055 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1056 uint32_t fb_width, uint32_t fb_height)
1057 {
1058 struct drm_framebuffer *fb = fb_helper->fb;
1059 info->pseudo_palette = fb_helper->pseudo_palette;
1060 info->var.xres_virtual = fb->width;
1061 info->var.yres_virtual = fb->height;
1062 info->var.bits_per_pixel = fb->bits_per_pixel;
1063 info->var.accel_flags = FB_ACCELF_TEXT;
1064 info->var.xoffset = 0;
1065 info->var.yoffset = 0;
1066 info->var.activate = FB_ACTIVATE_NOW;
1067 info->var.height = -1;
1068 info->var.width = -1;
1069
1070 switch (fb->depth) {
1071 case 8:
1072 info->var.red.offset = 0;
1073 info->var.green.offset = 0;
1074 info->var.blue.offset = 0;
1075 info->var.red.length = 8; /* 8bit DAC */
1076 info->var.green.length = 8;
1077 info->var.blue.length = 8;
1078 info->var.transp.offset = 0;
1079 info->var.transp.length = 0;
1080 break;
1081 case 15:
1082 info->var.red.offset = 10;
1083 info->var.green.offset = 5;
1084 info->var.blue.offset = 0;
1085 info->var.red.length = 5;
1086 info->var.green.length = 5;
1087 info->var.blue.length = 5;
1088 info->var.transp.offset = 15;
1089 info->var.transp.length = 1;
1090 break;
1091 case 16:
1092 info->var.red.offset = 11;
1093 info->var.green.offset = 5;
1094 info->var.blue.offset = 0;
1095 info->var.red.length = 5;
1096 info->var.green.length = 6;
1097 info->var.blue.length = 5;
1098 info->var.transp.offset = 0;
1099 break;
1100 case 24:
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 = 0;
1108 info->var.transp.length = 0;
1109 break;
1110 case 32:
1111 info->var.red.offset = 16;
1112 info->var.green.offset = 8;
1113 info->var.blue.offset = 0;
1114 info->var.red.length = 8;
1115 info->var.green.length = 8;
1116 info->var.blue.length = 8;
1117 info->var.transp.offset = 24;
1118 info->var.transp.length = 8;
1119 break;
1120 default:
1121 break;
1122 }
1123
1124 info->var.xres = fb_width;
1125 info->var.yres = fb_height;
1126 }
1127 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1128
1129 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1130 uint32_t maxX,
1131 uint32_t maxY)
1132 {
1133 struct drm_connector *connector;
1134 int count = 0;
1135 int i;
1136
1137 for (i = 0; i < fb_helper->connector_count; i++) {
1138 connector = fb_helper->connector_info[i]->connector;
1139 count += connector->funcs->fill_modes(connector, maxX, maxY);
1140 }
1141
1142 return count;
1143 }
1144
1145 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1146 {
1147 struct drm_display_mode *mode;
1148
1149 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1150 if (drm_mode_width(mode) > width ||
1151 drm_mode_height(mode) > height)
1152 continue;
1153 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1154 return mode;
1155 }
1156 return NULL;
1157 }
1158
1159 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1160 {
1161 struct drm_cmdline_mode *cmdline_mode;
1162 cmdline_mode = &fb_connector->cmdline_mode;
1163 return cmdline_mode->specified;
1164 }
1165
1166 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1167 int width, int height)
1168 {
1169 struct drm_cmdline_mode *cmdline_mode;
1170 struct drm_display_mode *mode = NULL;
1171
1172 cmdline_mode = &fb_helper_conn->cmdline_mode;
1173 if (cmdline_mode->specified == false)
1174 return mode;
1175
1176 /* attempt to find a matching mode in the list of modes
1177 * we have gotten so far, if not add a CVT mode that conforms
1178 */
1179 if (cmdline_mode->rb || cmdline_mode->margins)
1180 goto create_mode;
1181
1182 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1183 /* check width/height */
1184 if (mode->hdisplay != cmdline_mode->xres ||
1185 mode->vdisplay != cmdline_mode->yres)
1186 continue;
1187
1188 if (cmdline_mode->refresh_specified) {
1189 if (mode->vrefresh != cmdline_mode->refresh)
1190 continue;
1191 }
1192
1193 if (cmdline_mode->interlace) {
1194 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1195 continue;
1196 }
1197 return mode;
1198 }
1199
1200 create_mode:
1201 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1202 cmdline_mode);
1203 list_add(&mode->head, &fb_helper_conn->connector->modes);
1204 return mode;
1205 }
1206
1207 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1208 {
1209 bool enable;
1210
1211 if (strict)
1212 enable = connector->status == connector_status_connected;
1213 else
1214 enable = connector->status != connector_status_disconnected;
1215
1216 return enable;
1217 }
1218
1219 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1220 bool *enabled)
1221 {
1222 bool any_enabled = false;
1223 struct drm_connector *connector;
1224 int i = 0;
1225
1226 for (i = 0; i < fb_helper->connector_count; i++) {
1227 connector = fb_helper->connector_info[i]->connector;
1228 enabled[i] = drm_connector_enabled(connector, true);
1229 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1230 enabled[i] ? "yes" : "no");
1231 any_enabled |= enabled[i];
1232 }
1233
1234 if (any_enabled)
1235 return;
1236
1237 for (i = 0; i < fb_helper->connector_count; i++) {
1238 connector = fb_helper->connector_info[i]->connector;
1239 enabled[i] = drm_connector_enabled(connector, false);
1240 }
1241 }
1242
1243 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1244 struct drm_display_mode **modes,
1245 bool *enabled, int width, int height)
1246 {
1247 int count, i, j;
1248 bool can_clone = false;
1249 struct drm_fb_helper_connector *fb_helper_conn;
1250 struct drm_display_mode *dmt_mode, *mode;
1251
1252 /* only contemplate cloning in the single crtc case */
1253 if (fb_helper->crtc_count > 1)
1254 return false;
1255
1256 count = 0;
1257 for (i = 0; i < fb_helper->connector_count; i++) {
1258 if (enabled[i])
1259 count++;
1260 }
1261
1262 /* only contemplate cloning if more than one connector is enabled */
1263 if (count <= 1)
1264 return false;
1265
1266 /* check the command line or if nothing common pick 1024x768 */
1267 can_clone = true;
1268 for (i = 0; i < fb_helper->connector_count; i++) {
1269 if (!enabled[i])
1270 continue;
1271 fb_helper_conn = fb_helper->connector_info[i];
1272 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1273 if (!modes[i]) {
1274 can_clone = false;
1275 break;
1276 }
1277 for (j = 0; j < i; j++) {
1278 if (!enabled[j])
1279 continue;
1280 if (!drm_mode_equal(modes[j], modes[i]))
1281 can_clone = false;
1282 }
1283 }
1284
1285 if (can_clone) {
1286 DRM_DEBUG_KMS("can clone using command line\n");
1287 return true;
1288 }
1289
1290 /* try and find a 1024x768 mode on each connector */
1291 can_clone = true;
1292 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1293
1294 for (i = 0; i < fb_helper->connector_count; i++) {
1295
1296 if (!enabled[i])
1297 continue;
1298
1299 fb_helper_conn = fb_helper->connector_info[i];
1300 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1301 if (drm_mode_equal(mode, dmt_mode))
1302 modes[i] = mode;
1303 }
1304 if (!modes[i])
1305 can_clone = false;
1306 }
1307
1308 if (can_clone) {
1309 DRM_DEBUG_KMS("can clone using 1024x768\n");
1310 return true;
1311 }
1312 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1313 return false;
1314 }
1315
1316 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1317 struct drm_display_mode **modes,
1318 bool *enabled, int width, int height)
1319 {
1320 struct drm_fb_helper_connector *fb_helper_conn;
1321 int i;
1322
1323 for (i = 0; i < fb_helper->connector_count; i++) {
1324 fb_helper_conn = fb_helper->connector_info[i];
1325
1326 if (enabled[i] == false)
1327 continue;
1328
1329 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1330 fb_helper_conn->connector->base.id);
1331
1332 /* got for command line mode first */
1333 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1334 if (!modes[i]) {
1335 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1336 fb_helper_conn->connector->base.id);
1337 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1338 }
1339 /* No preferred modes, pick one off the list */
1340 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1341 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1342 break;
1343 }
1344 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1345 "none");
1346 }
1347 return true;
1348 }
1349
1350 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1351 struct drm_fb_helper_crtc **best_crtcs,
1352 struct drm_display_mode **modes,
1353 int n, int width, int height)
1354 {
1355 int c, o;
1356 struct drm_device *dev = fb_helper->dev;
1357 struct drm_connector *connector;
1358 struct drm_connector_helper_funcs *connector_funcs;
1359 struct drm_encoder *encoder;
1360 int my_score, best_score, score;
1361 struct drm_fb_helper_crtc **crtcs, *crtc;
1362 struct drm_fb_helper_connector *fb_helper_conn;
1363
1364 if (n == fb_helper->connector_count)
1365 return 0;
1366
1367 fb_helper_conn = fb_helper->connector_info[n];
1368 connector = fb_helper_conn->connector;
1369
1370 best_crtcs[n] = NULL;
1371 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1372 if (modes[n] == NULL)
1373 return best_score;
1374
1375 crtcs = kzalloc(dev->mode_config.num_connector *
1376 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1377 if (!crtcs)
1378 return best_score;
1379
1380 my_score = 1;
1381 if (connector->status == connector_status_connected)
1382 my_score++;
1383 if (drm_has_cmdline_mode(fb_helper_conn))
1384 my_score++;
1385 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1386 my_score++;
1387
1388 connector_funcs = connector->helper_private;
1389 encoder = connector_funcs->best_encoder(connector);
1390 if (!encoder)
1391 goto out;
1392
1393 /* select a crtc for this connector and then attempt to configure
1394 remaining connectors */
1395 for (c = 0; c < fb_helper->crtc_count; c++) {
1396 crtc = &fb_helper->crtc_info[c];
1397
1398 if ((encoder->possible_crtcs & (1 << c)) == 0)
1399 continue;
1400
1401 for (o = 0; o < n; o++)
1402 if (best_crtcs[o] == crtc)
1403 break;
1404
1405 if (o < n) {
1406 /* ignore cloning unless only a single crtc */
1407 if (fb_helper->crtc_count > 1)
1408 continue;
1409
1410 if (!drm_mode_equal(modes[o], modes[n]))
1411 continue;
1412 }
1413
1414 crtcs[n] = crtc;
1415 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1416 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1417 width, height);
1418 if (score > best_score) {
1419 best_score = score;
1420 memcpy(best_crtcs, crtcs,
1421 dev->mode_config.num_connector *
1422 sizeof(struct drm_fb_helper_crtc *));
1423 }
1424 }
1425 out:
1426 kfree(crtcs);
1427 return best_score;
1428 }
1429
1430 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1431 {
1432 struct drm_device *dev = fb_helper->dev;
1433 struct drm_fb_helper_crtc **crtcs;
1434 struct drm_display_mode **modes;
1435 struct drm_mode_set *modeset;
1436 bool *enabled;
1437 int width, height;
1438 int i;
1439
1440 DRM_DEBUG_KMS("\n");
1441
1442 width = dev->mode_config.max_width;
1443 height = dev->mode_config.max_height;
1444
1445 crtcs = kcalloc(dev->mode_config.num_connector,
1446 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1447 modes = kcalloc(dev->mode_config.num_connector,
1448 sizeof(struct drm_display_mode *), GFP_KERNEL);
1449 enabled = kcalloc(dev->mode_config.num_connector,
1450 sizeof(bool), GFP_KERNEL);
1451 if (!crtcs || !modes || !enabled) {
1452 DRM_ERROR("Memory allocation failed\n");
1453 goto out;
1454 }
1455
1456
1457 drm_enable_connectors(fb_helper, enabled);
1458
1459 if (!(fb_helper->funcs->initial_config &&
1460 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1461 enabled, width, height))) {
1462 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1463 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1464
1465 if (!drm_target_cloned(fb_helper,
1466 modes, enabled, width, height) &&
1467 !drm_target_preferred(fb_helper,
1468 modes, enabled, width, height))
1469 DRM_ERROR("Unable to find initial modes\n");
1470
1471 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1472 width, height);
1473
1474 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1475 }
1476
1477 /* need to set the modesets up here for use later */
1478 /* fill out the connector<->crtc mappings into the modesets */
1479 for (i = 0; i < fb_helper->crtc_count; i++) {
1480 modeset = &fb_helper->crtc_info[i].mode_set;
1481 modeset->num_connectors = 0;
1482 modeset->fb = NULL;
1483 }
1484
1485 for (i = 0; i < fb_helper->connector_count; i++) {
1486 struct drm_display_mode *mode = modes[i];
1487 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1488 modeset = &fb_crtc->mode_set;
1489
1490 if (mode && fb_crtc) {
1491 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1492 mode->name, fb_crtc->mode_set.crtc->base.id);
1493 fb_crtc->desired_mode = mode;
1494 if (modeset->mode)
1495 drm_mode_destroy(dev, modeset->mode);
1496 modeset->mode = drm_mode_duplicate(dev,
1497 fb_crtc->desired_mode);
1498 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1499 modeset->fb = fb_helper->fb;
1500 }
1501 }
1502
1503 /* Clear out any old modes if there are no more connected outputs. */
1504 for (i = 0; i < fb_helper->crtc_count; i++) {
1505 modeset = &fb_helper->crtc_info[i].mode_set;
1506 if (modeset->num_connectors == 0) {
1507 BUG_ON(modeset->fb);
1508 BUG_ON(modeset->num_connectors);
1509 if (modeset->mode)
1510 drm_mode_destroy(dev, modeset->mode);
1511 modeset->mode = NULL;
1512 }
1513 }
1514 out:
1515 kfree(crtcs);
1516 kfree(modes);
1517 kfree(enabled);
1518 }
1519
1520 /**
1521 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1522 * @fb_helper: fb_helper device struct
1523 * @bpp_sel: bpp value to use for the framebuffer configuration
1524 *
1525 * Scans the CRTCs and connectors and tries to put together an initial setup.
1526 * At the moment, this is a cloned configuration across all heads with
1527 * a new framebuffer object as the backing store.
1528 *
1529 * Note that this also registers the fbdev and so allows userspace to call into
1530 * the driver through the fbdev interfaces.
1531 *
1532 * This function will call down into the ->fb_probe callback to let
1533 * the driver allocate and initialize the fbdev info structure and the drm
1534 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1535 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1536 * values for the fbdev info structure.
1537 *
1538 * RETURNS:
1539 * Zero if everything went ok, nonzero otherwise.
1540 */
1541 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1542 {
1543 struct drm_device *dev = fb_helper->dev;
1544 int count = 0;
1545
1546 drm_fb_helper_parse_command_line(fb_helper);
1547
1548 count = drm_fb_helper_probe_connector_modes(fb_helper,
1549 dev->mode_config.max_width,
1550 dev->mode_config.max_height);
1551 /*
1552 * we shouldn't end up with no modes here.
1553 */
1554 if (count == 0)
1555 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1556
1557 drm_setup_crtcs(fb_helper);
1558
1559 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1560 }
1561 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1562
1563 /**
1564 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1565 * probing all the outputs attached to the fb
1566 * @fb_helper: the drm_fb_helper
1567 *
1568 * Scan the connectors attached to the fb_helper and try to put together a
1569 * setup after *notification of a change in output configuration.
1570 *
1571 * Called at runtime, takes the mode config locks to be able to check/change the
1572 * modeset configuration. Must be run from process context (which usually means
1573 * either the output polling work or a work item launched from the driver's
1574 * hotplug interrupt).
1575 *
1576 * Note that the driver must ensure that this is only called _after_ the fb has
1577 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1578 *
1579 * RETURNS:
1580 * 0 on success and a non-zero error code otherwise.
1581 */
1582 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1583 {
1584 struct drm_device *dev = fb_helper->dev;
1585 int count = 0;
1586 u32 max_width, max_height, bpp_sel;
1587
1588 if (!fb_helper->fb)
1589 return 0;
1590
1591 mutex_lock(&fb_helper->dev->mode_config.mutex);
1592 if (!drm_fb_helper_is_bound(fb_helper)) {
1593 fb_helper->delayed_hotplug = true;
1594 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1595 return 0;
1596 }
1597 DRM_DEBUG_KMS("\n");
1598
1599 max_width = fb_helper->fb->width;
1600 max_height = fb_helper->fb->height;
1601 bpp_sel = fb_helper->fb->bits_per_pixel;
1602
1603 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1604 max_height);
1605 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1606
1607 drm_modeset_lock_all(dev);
1608 drm_setup_crtcs(fb_helper);
1609 drm_modeset_unlock_all(dev);
1610 drm_fb_helper_set_par(fb_helper->fbdev);
1611
1612 return 0;
1613 }
1614 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1615
1616 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1617 * but the module doesn't depend on any fb console symbols. At least
1618 * attempt to load fbcon to avoid leaving the system without a usable console.
1619 */
1620 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1621 static int __init drm_fb_helper_modinit(void)
1622 {
1623 const char *name = "fbcon";
1624 struct module *fbcon;
1625
1626 mutex_lock(&module_mutex);
1627 fbcon = find_module(name);
1628 mutex_unlock(&module_mutex);
1629
1630 if (!fbcon)
1631 request_module_nowait(name);
1632 return 0;
1633 }
1634
1635 module_init(drm_fb_helper_modinit);
1636 #endif
Linux kernel - Deliverables
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