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