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/console.h>
33#include <linux/kernel.h>
34#include <linux/sysrq.h>
35#include <linux/slab.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#include <drm/drm_atomic.h>
42#include <drm/drm_atomic_helper.h>
43
44#include "drm_crtc_helper_internal.h"
45
46static bool drm_fbdev_emulation = true;
47module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
48MODULE_PARM_DESC(fbdev_emulation,
49 "Enable legacy fbdev emulation [default=true]");
50
51static LIST_HEAD(kernel_fb_helper_list);
52static DEFINE_MUTEX(kernel_fb_helper_lock);
53
54/**
55 * DOC: fbdev helpers
56 *
57 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
58 * mode setting driver. They can be used mostly independently from the crtc
59 * helper functions used by many drivers to implement the kernel mode setting
60 * interfaces.
61 *
62 * Initialization is done as a four-step process with drm_fb_helper_prepare(),
63 * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
64 * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
65 * default behaviour can override the third step with their own code.
66 * Teardown is done with drm_fb_helper_fini().
67 *
68 * At runtime drivers should restore the fbdev console by calling
69 * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
70 * They should also notify the fb helper code from updates to the output
71 * configuration by calling drm_fb_helper_hotplug_event(). For easier
72 * integration with the output polling code in drm_crtc_helper.c the modeset
73 * code provides a ->output_poll_changed callback.
74 *
75 * All other functions exported by the fb helper library can be used to
76 * implement the fbdev driver interface by the driver.
77 *
78 * It is possible, though perhaps somewhat tricky, to implement race-free
79 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
80 * helper must be called first to initialize the minimum required to make
81 * hotplug detection work. Drivers also need to make sure to properly set up
82 * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
83 * it is safe to enable interrupts and start processing hotplug events. At the
84 * same time, drivers should initialize all modeset objects such as CRTCs,
85 * encoders and connectors. To finish up the fbdev helper initialization, the
86 * drm_fb_helper_init() function is called. To probe for all attached displays
87 * and set up an initial configuration using the detected hardware, drivers
88 * should call drm_fb_helper_single_add_all_connectors() followed by
89 * drm_fb_helper_initial_config().
90 *
91 * If &drm_framebuffer_funcs ->dirty is set, the
92 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
93 * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
94 * away. This worker then calls the dirty() function ensuring that it will
95 * always run in process context since the fb_*() function could be running in
96 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
97 * callback it will also schedule dirty_work with the damage collected from the
98 * mmap page writes.
99 */
100
101#define drm_fb_helper_for_each_connector(fbh, i__) \
102 for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
103 i__ = 0; i__ < (fbh)->connector_count; i__++)
104
105/**
106 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
107 * emulation helper
108 * @fb_helper: fbdev initialized with drm_fb_helper_init
109 *
110 * This functions adds all the available connectors for use with the given
111 * fb_helper. This is a separate step to allow drivers to freely assign
112 * connectors to the fbdev, e.g. if some are reserved for special purposes or
113 * not adequate to be used for the fbcon.
114 *
115 * This function is protected against concurrent connector hotadds/removals
116 * using drm_fb_helper_add_one_connector() and
117 * drm_fb_helper_remove_one_connector().
118 */
119int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
120{
121 struct drm_device *dev = fb_helper->dev;
122 struct drm_connector *connector;
123 int i, ret;
124
125 if (!drm_fbdev_emulation)
126 return 0;
127
128 mutex_lock(&dev->mode_config.mutex);
129 drm_for_each_connector(connector, dev) {
130 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
131
132 if (ret)
133 goto fail;
134 }
135 mutex_unlock(&dev->mode_config.mutex);
136 return 0;
137fail:
138 drm_fb_helper_for_each_connector(fb_helper, i) {
139 struct drm_fb_helper_connector *fb_helper_connector =
140 fb_helper->connector_info[i];
141
142 drm_connector_unreference(fb_helper_connector->connector);
143
144 kfree(fb_helper_connector);
145 fb_helper->connector_info[i] = NULL;
146 }
147 fb_helper->connector_count = 0;
148 mutex_unlock(&dev->mode_config.mutex);
149
150 return ret;
151}
152EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
153
154int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
155{
156 struct drm_fb_helper_connector **temp;
157 struct drm_fb_helper_connector *fb_helper_connector;
158
159 if (!drm_fbdev_emulation)
160 return 0;
161
162 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
163 if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
164 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
165 if (!temp)
166 return -ENOMEM;
167
168 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
169 fb_helper->connector_info = temp;
170 }
171
172
173 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
174 if (!fb_helper_connector)
175 return -ENOMEM;
176
177 drm_connector_reference(connector);
178 fb_helper_connector->connector = connector;
179 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
180 return 0;
181}
182EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
183
184int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
185 struct drm_connector *connector)
186{
187 struct drm_fb_helper_connector *fb_helper_connector;
188 int i, j;
189
190 if (!drm_fbdev_emulation)
191 return 0;
192
193 WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
194
195 for (i = 0; i < fb_helper->connector_count; i++) {
196 if (fb_helper->connector_info[i]->connector == connector)
197 break;
198 }
199
200 if (i == fb_helper->connector_count)
201 return -EINVAL;
202 fb_helper_connector = fb_helper->connector_info[i];
203 drm_connector_unreference(fb_helper_connector->connector);
204
205 for (j = i + 1; j < fb_helper->connector_count; j++) {
206 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
207 }
208 fb_helper->connector_count--;
209 kfree(fb_helper_connector);
210
211 return 0;
212}
213EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
214
215static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
216{
217 uint16_t *r_base, *g_base, *b_base;
218 int i;
219
220 if (helper->funcs->gamma_get == NULL)
221 return;
222
223 r_base = crtc->gamma_store;
224 g_base = r_base + crtc->gamma_size;
225 b_base = g_base + crtc->gamma_size;
226
227 for (i = 0; i < crtc->gamma_size; i++)
228 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
229}
230
231static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
232{
233 uint16_t *r_base, *g_base, *b_base;
234
235 if (crtc->funcs->gamma_set == NULL)
236 return;
237
238 r_base = crtc->gamma_store;
239 g_base = r_base + crtc->gamma_size;
240 b_base = g_base + crtc->gamma_size;
241
242 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
243}
244
245/**
246 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
247 * @info: fbdev registered by the helper
248 */
249int drm_fb_helper_debug_enter(struct fb_info *info)
250{
251 struct drm_fb_helper *helper = info->par;
252 const struct drm_crtc_helper_funcs *funcs;
253 int i;
254
255 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
256 for (i = 0; i < helper->crtc_count; i++) {
257 struct drm_mode_set *mode_set =
258 &helper->crtc_info[i].mode_set;
259
260 if (!mode_set->crtc->enabled)
261 continue;
262
263 funcs = mode_set->crtc->helper_private;
264 if (funcs->mode_set_base_atomic == NULL)
265 continue;
266
267 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
268 funcs->mode_set_base_atomic(mode_set->crtc,
269 mode_set->fb,
270 mode_set->x,
271 mode_set->y,
272 ENTER_ATOMIC_MODE_SET);
273 }
274 }
275
276 return 0;
277}
278EXPORT_SYMBOL(drm_fb_helper_debug_enter);
279
280/* Find the real fb for a given fb helper CRTC */
281static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
282{
283 struct drm_device *dev = crtc->dev;
284 struct drm_crtc *c;
285
286 drm_for_each_crtc(c, dev) {
287 if (crtc->base.id == c->base.id)
288 return c->primary->fb;
289 }
290
291 return NULL;
292}
293
294/**
295 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
296 * @info: fbdev registered by the helper
297 */
298int drm_fb_helper_debug_leave(struct fb_info *info)
299{
300 struct drm_fb_helper *helper = info->par;
301 struct drm_crtc *crtc;
302 const struct drm_crtc_helper_funcs *funcs;
303 struct drm_framebuffer *fb;
304 int i;
305
306 for (i = 0; i < helper->crtc_count; i++) {
307 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
308 crtc = mode_set->crtc;
309 funcs = crtc->helper_private;
310 fb = drm_mode_config_fb(crtc);
311
312 if (!crtc->enabled)
313 continue;
314
315 if (!fb) {
316 DRM_ERROR("no fb to restore??\n");
317 continue;
318 }
319
320 if (funcs->mode_set_base_atomic == NULL)
321 continue;
322
323 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
324 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
325 crtc->y, LEAVE_ATOMIC_MODE_SET);
326 }
327
328 return 0;
329}
330EXPORT_SYMBOL(drm_fb_helper_debug_leave);
331
332static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
333{
334 struct drm_device *dev = fb_helper->dev;
335 struct drm_plane *plane;
336 struct drm_atomic_state *state;
337 int i, ret;
338 unsigned plane_mask;
339
340 state = drm_atomic_state_alloc(dev);
341 if (!state)
342 return -ENOMEM;
343
344 state->acquire_ctx = dev->mode_config.acquire_ctx;
345retry:
346 plane_mask = 0;
347 drm_for_each_plane(plane, dev) {
348 struct drm_plane_state *plane_state;
349
350 plane_state = drm_atomic_get_plane_state(state, plane);
351 if (IS_ERR(plane_state)) {
352 ret = PTR_ERR(plane_state);
353 goto fail;
354 }
355
356 plane_state->rotation = DRM_ROTATE_0;
357
358 plane->old_fb = plane->fb;
359 plane_mask |= 1 << drm_plane_index(plane);
360
361 /* disable non-primary: */
362 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
363 continue;
364
365 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
366 if (ret != 0)
367 goto fail;
368 }
369
370 for(i = 0; i < fb_helper->crtc_count; i++) {
371 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
372
373 ret = __drm_atomic_helper_set_config(mode_set, state);
374 if (ret != 0)
375 goto fail;
376 }
377
378 ret = drm_atomic_commit(state);
379
380fail:
381 drm_atomic_clean_old_fb(dev, plane_mask, ret);
382
383 if (ret == -EDEADLK)
384 goto backoff;
385
386 drm_atomic_state_put(state);
387 return ret;
388
389backoff:
390 drm_atomic_state_clear(state);
391 drm_atomic_legacy_backoff(state);
392
393 goto retry;
394}
395
396static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
397{
398 struct drm_device *dev = fb_helper->dev;
399 struct drm_plane *plane;
400 int i;
401
402 drm_warn_on_modeset_not_all_locked(dev);
403
404 if (dev->mode_config.funcs->atomic_commit)
405 return restore_fbdev_mode_atomic(fb_helper);
406
407 drm_for_each_plane(plane, dev) {
408 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
409 drm_plane_force_disable(plane);
410
411 if (plane->rotation_property)
412 drm_mode_plane_set_obj_prop(plane,
413 plane->rotation_property,
414 DRM_ROTATE_0);
415 }
416
417 for (i = 0; i < fb_helper->crtc_count; i++) {
418 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
419 struct drm_crtc *crtc = mode_set->crtc;
420 int ret;
421
422 if (crtc->funcs->cursor_set2) {
423 ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
424 if (ret)
425 return ret;
426 } else if (crtc->funcs->cursor_set) {
427 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
428 if (ret)
429 return ret;
430 }
431
432 ret = drm_mode_set_config_internal(mode_set);
433 if (ret)
434 return ret;
435 }
436
437 return 0;
438}
439
440/**
441 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
442 * @fb_helper: fbcon to restore
443 *
444 * This should be called from driver's drm ->lastclose callback
445 * when implementing an fbcon on top of kms using this helper. This ensures that
446 * the user isn't greeted with a black screen when e.g. X dies.
447 *
448 * RETURNS:
449 * Zero if everything went ok, negative error code otherwise.
450 */
451int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
452{
453 struct drm_device *dev = fb_helper->dev;
454 bool do_delayed;
455 int ret;
456
457 if (!drm_fbdev_emulation)
458 return -ENODEV;
459
460 drm_modeset_lock_all(dev);
461 ret = restore_fbdev_mode(fb_helper);
462
463 do_delayed = fb_helper->delayed_hotplug;
464 if (do_delayed)
465 fb_helper->delayed_hotplug = false;
466 drm_modeset_unlock_all(dev);
467
468 if (do_delayed)
469 drm_fb_helper_hotplug_event(fb_helper);
470 return ret;
471}
472EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
473
474static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
475{
476 struct drm_device *dev = fb_helper->dev;
477 struct drm_crtc *crtc;
478 int bound = 0, crtcs_bound = 0;
479
480 /* Sometimes user space wants everything disabled, so don't steal the
481 * display if there's a master. */
482 if (READ_ONCE(dev->master))
483 return false;
484
485 drm_for_each_crtc(crtc, dev) {
486 if (crtc->primary->fb)
487 crtcs_bound++;
488 if (crtc->primary->fb == fb_helper->fb)
489 bound++;
490 }
491
492 if (bound < crtcs_bound)
493 return false;
494
495 return true;
496}
497
498#ifdef CONFIG_MAGIC_SYSRQ
499/*
500 * restore fbcon display for all kms driver's using this helper, used for sysrq
501 * and panic handling.
502 */
503static bool drm_fb_helper_force_kernel_mode(void)
504{
505 bool ret, error = false;
506 struct drm_fb_helper *helper;
507
508 if (list_empty(&kernel_fb_helper_list))
509 return false;
510
511 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
512 struct drm_device *dev = helper->dev;
513
514 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
515 continue;
516
517 drm_modeset_lock_all(dev);
518 ret = restore_fbdev_mode(helper);
519 if (ret)
520 error = true;
521 drm_modeset_unlock_all(dev);
522 }
523 return error;
524}
525
526static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
527{
528 bool ret;
529 ret = drm_fb_helper_force_kernel_mode();
530 if (ret == true)
531 DRM_ERROR("Failed to restore crtc configuration\n");
532}
533static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
534
535static void drm_fb_helper_sysrq(int dummy1)
536{
537 schedule_work(&drm_fb_helper_restore_work);
538}
539
540static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
541 .handler = drm_fb_helper_sysrq,
542 .help_msg = "force-fb(V)",
543 .action_msg = "Restore framebuffer console",
544};
545#else
546static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
547#endif
548
549static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
550{
551 struct drm_fb_helper *fb_helper = info->par;
552 struct drm_device *dev = fb_helper->dev;
553 struct drm_crtc *crtc;
554 struct drm_connector *connector;
555 int i, j;
556
557 /*
558 * For each CRTC in this fb, turn the connectors on/off.
559 */
560 drm_modeset_lock_all(dev);
561 if (!drm_fb_helper_is_bound(fb_helper)) {
562 drm_modeset_unlock_all(dev);
563 return;
564 }
565
566 for (i = 0; i < fb_helper->crtc_count; i++) {
567 crtc = fb_helper->crtc_info[i].mode_set.crtc;
568
569 if (!crtc->enabled)
570 continue;
571
572 /* Walk the connectors & encoders on this fb turning them on/off */
573 drm_fb_helper_for_each_connector(fb_helper, j) {
574 connector = fb_helper->connector_info[j]->connector;
575 connector->funcs->dpms(connector, dpms_mode);
576 drm_object_property_set_value(&connector->base,
577 dev->mode_config.dpms_property, dpms_mode);
578 }
579 }
580 drm_modeset_unlock_all(dev);
581}
582
583/**
584 * drm_fb_helper_blank - implementation for ->fb_blank
585 * @blank: desired blanking state
586 * @info: fbdev registered by the helper
587 */
588int drm_fb_helper_blank(int blank, struct fb_info *info)
589{
590 if (oops_in_progress)
591 return -EBUSY;
592
593 switch (blank) {
594 /* Display: On; HSync: On, VSync: On */
595 case FB_BLANK_UNBLANK:
596 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
597 break;
598 /* Display: Off; HSync: On, VSync: On */
599 case FB_BLANK_NORMAL:
600 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
601 break;
602 /* Display: Off; HSync: Off, VSync: On */
603 case FB_BLANK_HSYNC_SUSPEND:
604 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
605 break;
606 /* Display: Off; HSync: On, VSync: Off */
607 case FB_BLANK_VSYNC_SUSPEND:
608 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
609 break;
610 /* Display: Off; HSync: Off, VSync: Off */
611 case FB_BLANK_POWERDOWN:
612 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
613 break;
614 }
615 return 0;
616}
617EXPORT_SYMBOL(drm_fb_helper_blank);
618
619static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper,
620 struct drm_mode_set *modeset)
621{
622 int i;
623
624 for (i = 0; i < modeset->num_connectors; i++) {
625 drm_connector_unreference(modeset->connectors[i]);
626 modeset->connectors[i] = NULL;
627 }
628 modeset->num_connectors = 0;
629
630 drm_mode_destroy(helper->dev, modeset->mode);
631 modeset->mode = NULL;
632
633 /* FIXME should hold a ref? */
634 modeset->fb = NULL;
635}
636
637static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
638{
639 int i;
640
641 for (i = 0; i < helper->connector_count; i++) {
642 drm_connector_unreference(helper->connector_info[i]->connector);
643 kfree(helper->connector_info[i]);
644 }
645 kfree(helper->connector_info);
646
647 for (i = 0; i < helper->crtc_count; i++) {
648 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set;
649
650 drm_fb_helper_modeset_release(helper, modeset);
651 kfree(modeset->connectors);
652 }
653 kfree(helper->crtc_info);
654}
655
656static void drm_fb_helper_resume_worker(struct work_struct *work)
657{
658 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
659 resume_work);
660
661 console_lock();
662 fb_set_suspend(helper->fbdev, 0);
663 console_unlock();
664}
665
666static void drm_fb_helper_dirty_work(struct work_struct *work)
667{
668 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
669 dirty_work);
670 struct drm_clip_rect *clip = &helper->dirty_clip;
671 struct drm_clip_rect clip_copy;
672 unsigned long flags;
673
674 spin_lock_irqsave(&helper->dirty_lock, flags);
675 clip_copy = *clip;
676 clip->x1 = clip->y1 = ~0;
677 clip->x2 = clip->y2 = 0;
678 spin_unlock_irqrestore(&helper->dirty_lock, flags);
679
680 /* call dirty callback only when it has been really touched */
681 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)
682 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
683}
684
685/**
686 * drm_fb_helper_prepare - setup a drm_fb_helper structure
687 * @dev: DRM device
688 * @helper: driver-allocated fbdev helper structure to set up
689 * @funcs: pointer to structure of functions associate with this helper
690 *
691 * Sets up the bare minimum to make the framebuffer helper usable. This is
692 * useful to implement race-free initialization of the polling helpers.
693 */
694void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
695 const struct drm_fb_helper_funcs *funcs)
696{
697 INIT_LIST_HEAD(&helper->kernel_fb_list);
698 spin_lock_init(&helper->dirty_lock);
699 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
700 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
701 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
702 helper->funcs = funcs;
703 helper->dev = dev;
704}
705EXPORT_SYMBOL(drm_fb_helper_prepare);
706
707/**
708 * drm_fb_helper_init - initialize a drm_fb_helper structure
709 * @dev: drm device
710 * @fb_helper: driver-allocated fbdev helper structure to initialize
711 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
712 * @max_conn_count: max connector count
713 *
714 * This allocates the structures for the fbdev helper with the given limits.
715 * Note that this won't yet touch the hardware (through the driver interfaces)
716 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
717 * to allow driver writes more control over the exact init sequence.
718 *
719 * Drivers must call drm_fb_helper_prepare() before calling this function.
720 *
721 * RETURNS:
722 * Zero if everything went ok, nonzero otherwise.
723 */
724int drm_fb_helper_init(struct drm_device *dev,
725 struct drm_fb_helper *fb_helper,
726 int crtc_count, int max_conn_count)
727{
728 struct drm_crtc *crtc;
729 int i;
730
731 if (!drm_fbdev_emulation)
732 return 0;
733
734 if (!max_conn_count)
735 return -EINVAL;
736
737 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
738 if (!fb_helper->crtc_info)
739 return -ENOMEM;
740
741 fb_helper->crtc_count = crtc_count;
742 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
743 if (!fb_helper->connector_info) {
744 kfree(fb_helper->crtc_info);
745 return -ENOMEM;
746 }
747 fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
748 fb_helper->connector_count = 0;
749
750 for (i = 0; i < crtc_count; i++) {
751 fb_helper->crtc_info[i].mode_set.connectors =
752 kcalloc(max_conn_count,
753 sizeof(struct drm_connector *),
754 GFP_KERNEL);
755
756 if (!fb_helper->crtc_info[i].mode_set.connectors)
757 goto out_free;
758 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
759 }
760
761 i = 0;
762 drm_for_each_crtc(crtc, dev) {
763 fb_helper->crtc_info[i].mode_set.crtc = crtc;
764 i++;
765 }
766
767 return 0;
768out_free:
769 drm_fb_helper_crtc_free(fb_helper);
770 return -ENOMEM;
771}
772EXPORT_SYMBOL(drm_fb_helper_init);
773
774/**
775 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
776 * @fb_helper: driver-allocated fbdev helper
777 *
778 * A helper to alloc fb_info and the members cmap and apertures. Called
779 * by the driver within the fb_probe fb_helper callback function.
780 *
781 * RETURNS:
782 * fb_info pointer if things went okay, pointer containing error code
783 * otherwise
784 */
785struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
786{
787 struct device *dev = fb_helper->dev->dev;
788 struct fb_info *info;
789 int ret;
790
791 info = framebuffer_alloc(0, dev);
792 if (!info)
793 return ERR_PTR(-ENOMEM);
794
795 ret = fb_alloc_cmap(&info->cmap, 256, 0);
796 if (ret)
797 goto err_release;
798
799 info->apertures = alloc_apertures(1);
800 if (!info->apertures) {
801 ret = -ENOMEM;
802 goto err_free_cmap;
803 }
804
805 fb_helper->fbdev = info;
806
807 return info;
808
809err_free_cmap:
810 fb_dealloc_cmap(&info->cmap);
811err_release:
812 framebuffer_release(info);
813 return ERR_PTR(ret);
814}
815EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
816
817/**
818 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
819 * @fb_helper: driver-allocated fbdev helper
820 *
821 * A wrapper around unregister_framebuffer, to release the fb_info
822 * framebuffer device
823 */
824void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
825{
826 if (fb_helper && fb_helper->fbdev)
827 unregister_framebuffer(fb_helper->fbdev);
828}
829EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
830
831/**
832 * drm_fb_helper_release_fbi - dealloc fb_info and its members
833 * @fb_helper: driver-allocated fbdev helper
834 *
835 * A helper to free memory taken by fb_info and the members cmap and
836 * apertures
837 */
838void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
839{
840 if (fb_helper) {
841 struct fb_info *info = fb_helper->fbdev;
842
843 if (info) {
844 if (info->cmap.len)
845 fb_dealloc_cmap(&info->cmap);
846 framebuffer_release(info);
847 }
848
849 fb_helper->fbdev = NULL;
850 }
851}
852EXPORT_SYMBOL(drm_fb_helper_release_fbi);
853
854void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
855{
856 if (!drm_fbdev_emulation)
857 return;
858
859 cancel_work_sync(&fb_helper->resume_work);
860 cancel_work_sync(&fb_helper->dirty_work);
861
862 mutex_lock(&kernel_fb_helper_lock);
863 if (!list_empty(&fb_helper->kernel_fb_list)) {
864 list_del(&fb_helper->kernel_fb_list);
865 if (list_empty(&kernel_fb_helper_list)) {
866 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
867 }
868 }
869 mutex_unlock(&kernel_fb_helper_lock);
870
871 drm_fb_helper_crtc_free(fb_helper);
872
873}
874EXPORT_SYMBOL(drm_fb_helper_fini);
875
876/**
877 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
878 * @fb_helper: driver-allocated fbdev helper
879 *
880 * A wrapper around unlink_framebuffer implemented by fbdev core
881 */
882void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
883{
884 if (fb_helper && fb_helper->fbdev)
885 unlink_framebuffer(fb_helper->fbdev);
886}
887EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
888
889static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
890 u32 width, u32 height)
891{
892 struct drm_fb_helper *helper = info->par;
893 struct drm_clip_rect *clip = &helper->dirty_clip;
894 unsigned long flags;
895
896 if (!helper->fb->funcs->dirty)
897 return;
898
899 spin_lock_irqsave(&helper->dirty_lock, flags);
900 clip->x1 = min_t(u32, clip->x1, x);
901 clip->y1 = min_t(u32, clip->y1, y);
902 clip->x2 = max_t(u32, clip->x2, x + width);
903 clip->y2 = max_t(u32, clip->y2, y + height);
904 spin_unlock_irqrestore(&helper->dirty_lock, flags);
905
906 schedule_work(&helper->dirty_work);
907}
908
909/**
910 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
911 * @info: fb_info struct pointer
912 * @pagelist: list of dirty mmap framebuffer pages
913 *
914 * This function is used as the &fb_deferred_io ->deferred_io
915 * callback function for flushing the fbdev mmap writes.
916 */
917void drm_fb_helper_deferred_io(struct fb_info *info,
918 struct list_head *pagelist)
919{
920 unsigned long start, end, min, max;
921 struct page *page;
922 u32 y1, y2;
923
924 min = ULONG_MAX;
925 max = 0;
926 list_for_each_entry(page, pagelist, lru) {
927 start = page->index << PAGE_SHIFT;
928 end = start + PAGE_SIZE - 1;
929 min = min(min, start);
930 max = max(max, end);
931 }
932
933 if (min < max) {
934 y1 = min / info->fix.line_length;
935 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
936 info->var.yres);
937 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
938 }
939}
940EXPORT_SYMBOL(drm_fb_helper_deferred_io);
941
942/**
943 * drm_fb_helper_sys_read - wrapper around fb_sys_read
944 * @info: fb_info struct pointer
945 * @buf: userspace buffer to read from framebuffer memory
946 * @count: number of bytes to read from framebuffer memory
947 * @ppos: read offset within framebuffer memory
948 *
949 * A wrapper around fb_sys_read implemented by fbdev core
950 */
951ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
952 size_t count, loff_t *ppos)
953{
954 return fb_sys_read(info, buf, count, ppos);
955}
956EXPORT_SYMBOL(drm_fb_helper_sys_read);
957
958/**
959 * drm_fb_helper_sys_write - wrapper around fb_sys_write
960 * @info: fb_info struct pointer
961 * @buf: userspace buffer to write to framebuffer memory
962 * @count: number of bytes to write to framebuffer memory
963 * @ppos: write offset within framebuffer memory
964 *
965 * A wrapper around fb_sys_write implemented by fbdev core
966 */
967ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
968 size_t count, loff_t *ppos)
969{
970 ssize_t ret;
971
972 ret = fb_sys_write(info, buf, count, ppos);
973 if (ret > 0)
974 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
975 info->var.yres);
976
977 return ret;
978}
979EXPORT_SYMBOL(drm_fb_helper_sys_write);
980
981/**
982 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
983 * @info: fbdev registered by the helper
984 * @rect: info about rectangle to fill
985 *
986 * A wrapper around sys_fillrect implemented by fbdev core
987 */
988void drm_fb_helper_sys_fillrect(struct fb_info *info,
989 const struct fb_fillrect *rect)
990{
991 sys_fillrect(info, rect);
992 drm_fb_helper_dirty(info, rect->dx, rect->dy,
993 rect->width, rect->height);
994}
995EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
996
997/**
998 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
999 * @info: fbdev registered by the helper
1000 * @area: info about area to copy
1001 *
1002 * A wrapper around sys_copyarea implemented by fbdev core
1003 */
1004void drm_fb_helper_sys_copyarea(struct fb_info *info,
1005 const struct fb_copyarea *area)
1006{
1007 sys_copyarea(info, area);
1008 drm_fb_helper_dirty(info, area->dx, area->dy,
1009 area->width, area->height);
1010}
1011EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
1012
1013/**
1014 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1015 * @info: fbdev registered by the helper
1016 * @image: info about image to blit
1017 *
1018 * A wrapper around sys_imageblit implemented by fbdev core
1019 */
1020void drm_fb_helper_sys_imageblit(struct fb_info *info,
1021 const struct fb_image *image)
1022{
1023 sys_imageblit(info, image);
1024 drm_fb_helper_dirty(info, image->dx, image->dy,
1025 image->width, image->height);
1026}
1027EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
1028
1029/**
1030 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1031 * @info: fbdev registered by the helper
1032 * @rect: info about rectangle to fill
1033 *
1034 * A wrapper around cfb_imageblit implemented by fbdev core
1035 */
1036void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1037 const struct fb_fillrect *rect)
1038{
1039 cfb_fillrect(info, rect);
1040 drm_fb_helper_dirty(info, rect->dx, rect->dy,
1041 rect->width, rect->height);
1042}
1043EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1044
1045/**
1046 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1047 * @info: fbdev registered by the helper
1048 * @area: info about area to copy
1049 *
1050 * A wrapper around cfb_copyarea implemented by fbdev core
1051 */
1052void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1053 const struct fb_copyarea *area)
1054{
1055 cfb_copyarea(info, area);
1056 drm_fb_helper_dirty(info, area->dx, area->dy,
1057 area->width, area->height);
1058}
1059EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1060
1061/**
1062 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1063 * @info: fbdev registered by the helper
1064 * @image: info about image to blit
1065 *
1066 * A wrapper around cfb_imageblit implemented by fbdev core
1067 */
1068void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1069 const struct fb_image *image)
1070{
1071 cfb_imageblit(info, image);
1072 drm_fb_helper_dirty(info, image->dx, image->dy,
1073 image->width, image->height);
1074}
1075EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1076
1077/**
1078 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1079 * @fb_helper: driver-allocated fbdev helper
1080 * @suspend: whether to suspend or resume
1081 *
1082 * A wrapper around fb_set_suspend implemented by fbdev core.
1083 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1084 * the lock yourself
1085 */
1086void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1087{
1088 if (fb_helper && fb_helper->fbdev)
1089 fb_set_suspend(fb_helper->fbdev, suspend);
1090}
1091EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1092
1093/**
1094 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1095 * takes the console lock
1096 * @fb_helper: driver-allocated fbdev helper
1097 * @suspend: whether to suspend or resume
1098 *
1099 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1100 * isn't available on resume, a worker is tasked with waiting for the lock
1101 * to become available. The console lock can be pretty contented on resume
1102 * due to all the printk activity.
1103 *
1104 * This function can be called multiple times with the same state since
1105 * &fb_info->state is checked to see if fbdev is running or not before locking.
1106 *
1107 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1108 */
1109void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1110 bool suspend)
1111{
1112 if (!fb_helper || !fb_helper->fbdev)
1113 return;
1114
1115 /* make sure there's no pending/ongoing resume */
1116 flush_work(&fb_helper->resume_work);
1117
1118 if (suspend) {
1119 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
1120 return;
1121
1122 console_lock();
1123
1124 } else {
1125 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
1126 return;
1127
1128 if (!console_trylock()) {
1129 schedule_work(&fb_helper->resume_work);
1130 return;
1131 }
1132 }
1133
1134 fb_set_suspend(fb_helper->fbdev, suspend);
1135 console_unlock();
1136}
1137EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1138
1139static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1140 u16 blue, u16 regno, struct fb_info *info)
1141{
1142 struct drm_fb_helper *fb_helper = info->par;
1143 struct drm_framebuffer *fb = fb_helper->fb;
1144
1145 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1146 u32 *palette;
1147 u32 value;
1148 /* place color in psuedopalette */
1149 if (regno > 16)
1150 return -EINVAL;
1151 palette = (u32 *)info->pseudo_palette;
1152 red >>= (16 - info->var.red.length);
1153 green >>= (16 - info->var.green.length);
1154 blue >>= (16 - info->var.blue.length);
1155 value = (red << info->var.red.offset) |
1156 (green << info->var.green.offset) |
1157 (blue << info->var.blue.offset);
1158 if (info->var.transp.length > 0) {
1159 u32 mask = (1 << info->var.transp.length) - 1;
1160 mask <<= info->var.transp.offset;
1161 value |= mask;
1162 }
1163 palette[regno] = value;
1164 return 0;
1165 }
1166
1167 /*
1168 * The driver really shouldn't advertise pseudo/directcolor
1169 * visuals if it can't deal with the palette.
1170 */
1171 if (WARN_ON(!fb_helper->funcs->gamma_set ||
1172 !fb_helper->funcs->gamma_get))
1173 return -EINVAL;
1174
1175 WARN_ON(fb->bits_per_pixel != 8);
1176
1177 fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1178
1179 return 0;
1180}
1181
1182/**
1183 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1184 * @cmap: cmap to set
1185 * @info: fbdev registered by the helper
1186 */
1187int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1188{
1189 struct drm_fb_helper *fb_helper = info->par;
1190 struct drm_device *dev = fb_helper->dev;
1191 const struct drm_crtc_helper_funcs *crtc_funcs;
1192 u16 *red, *green, *blue, *transp;
1193 struct drm_crtc *crtc;
1194 int i, j, rc = 0;
1195 int start;
1196
1197 if (oops_in_progress)
1198 return -EBUSY;
1199
1200 drm_modeset_lock_all(dev);
1201 if (!drm_fb_helper_is_bound(fb_helper)) {
1202 drm_modeset_unlock_all(dev);
1203 return -EBUSY;
1204 }
1205
1206 for (i = 0; i < fb_helper->crtc_count; i++) {
1207 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1208 crtc_funcs = crtc->helper_private;
1209
1210 red = cmap->red;
1211 green = cmap->green;
1212 blue = cmap->blue;
1213 transp = cmap->transp;
1214 start = cmap->start;
1215
1216 for (j = 0; j < cmap->len; j++) {
1217 u16 hred, hgreen, hblue, htransp = 0xffff;
1218
1219 hred = *red++;
1220 hgreen = *green++;
1221 hblue = *blue++;
1222
1223 if (transp)
1224 htransp = *transp++;
1225
1226 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1227 if (rc)
1228 goto out;
1229 }
1230 if (crtc_funcs->load_lut)
1231 crtc_funcs->load_lut(crtc);
1232 }
1233 out:
1234 drm_modeset_unlock_all(dev);
1235 return rc;
1236}
1237EXPORT_SYMBOL(drm_fb_helper_setcmap);
1238
1239/**
1240 * drm_fb_helper_check_var - implementation for ->fb_check_var
1241 * @var: screeninfo to check
1242 * @info: fbdev registered by the helper
1243 */
1244int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1245 struct fb_info *info)
1246{
1247 struct drm_fb_helper *fb_helper = info->par;
1248 struct drm_framebuffer *fb = fb_helper->fb;
1249 int depth;
1250
1251 if (var->pixclock != 0 || in_dbg_master())
1252 return -EINVAL;
1253
1254 /*
1255 * Changes struct fb_var_screeninfo are currently not pushed back
1256 * to KMS, hence fail if different settings are requested.
1257 */
1258 if (var->bits_per_pixel != fb->bits_per_pixel ||
1259 var->xres != fb->width || var->yres != fb->height ||
1260 var->xres_virtual != fb->width || var->yres_virtual != fb->height) {
1261 DRM_DEBUG("fb userspace requested width/height/bpp different than current fb "
1262 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1263 var->xres, var->yres, var->bits_per_pixel,
1264 var->xres_virtual, var->yres_virtual,
1265 fb->width, fb->height, fb->bits_per_pixel);
1266 return -EINVAL;
1267 }
1268
1269 switch (var->bits_per_pixel) {
1270 case 16:
1271 depth = (var->green.length == 6) ? 16 : 15;
1272 break;
1273 case 32:
1274 depth = (var->transp.length > 0) ? 32 : 24;
1275 break;
1276 default:
1277 depth = var->bits_per_pixel;
1278 break;
1279 }
1280
1281 switch (depth) {
1282 case 8:
1283 var->red.offset = 0;
1284 var->green.offset = 0;
1285 var->blue.offset = 0;
1286 var->red.length = 8;
1287 var->green.length = 8;
1288 var->blue.length = 8;
1289 var->transp.length = 0;
1290 var->transp.offset = 0;
1291 break;
1292 case 15:
1293 var->red.offset = 10;
1294 var->green.offset = 5;
1295 var->blue.offset = 0;
1296 var->red.length = 5;
1297 var->green.length = 5;
1298 var->blue.length = 5;
1299 var->transp.length = 1;
1300 var->transp.offset = 15;
1301 break;
1302 case 16:
1303 var->red.offset = 11;
1304 var->green.offset = 5;
1305 var->blue.offset = 0;
1306 var->red.length = 5;
1307 var->green.length = 6;
1308 var->blue.length = 5;
1309 var->transp.length = 0;
1310 var->transp.offset = 0;
1311 break;
1312 case 24:
1313 var->red.offset = 16;
1314 var->green.offset = 8;
1315 var->blue.offset = 0;
1316 var->red.length = 8;
1317 var->green.length = 8;
1318 var->blue.length = 8;
1319 var->transp.length = 0;
1320 var->transp.offset = 0;
1321 break;
1322 case 32:
1323 var->red.offset = 16;
1324 var->green.offset = 8;
1325 var->blue.offset = 0;
1326 var->red.length = 8;
1327 var->green.length = 8;
1328 var->blue.length = 8;
1329 var->transp.length = 8;
1330 var->transp.offset = 24;
1331 break;
1332 default:
1333 return -EINVAL;
1334 }
1335 return 0;
1336}
1337EXPORT_SYMBOL(drm_fb_helper_check_var);
1338
1339/**
1340 * drm_fb_helper_set_par - implementation for ->fb_set_par
1341 * @info: fbdev registered by the helper
1342 *
1343 * This will let fbcon do the mode init and is called at initialization time by
1344 * the fbdev core when registering the driver, and later on through the hotplug
1345 * callback.
1346 */
1347int drm_fb_helper_set_par(struct fb_info *info)
1348{
1349 struct drm_fb_helper *fb_helper = info->par;
1350 struct fb_var_screeninfo *var = &info->var;
1351
1352 if (oops_in_progress)
1353 return -EBUSY;
1354
1355 if (var->pixclock != 0) {
1356 DRM_ERROR("PIXEL CLOCK SET\n");
1357 return -EINVAL;
1358 }
1359
1360 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1361
1362 return 0;
1363}
1364EXPORT_SYMBOL(drm_fb_helper_set_par);
1365
1366static int pan_display_atomic(struct fb_var_screeninfo *var,
1367 struct fb_info *info)
1368{
1369 struct drm_fb_helper *fb_helper = info->par;
1370 struct drm_device *dev = fb_helper->dev;
1371 struct drm_atomic_state *state;
1372 struct drm_plane *plane;
1373 int i, ret;
1374 unsigned plane_mask;
1375
1376 state = drm_atomic_state_alloc(dev);
1377 if (!state)
1378 return -ENOMEM;
1379
1380 state->acquire_ctx = dev->mode_config.acquire_ctx;
1381retry:
1382 plane_mask = 0;
1383 for(i = 0; i < fb_helper->crtc_count; i++) {
1384 struct drm_mode_set *mode_set;
1385
1386 mode_set = &fb_helper->crtc_info[i].mode_set;
1387
1388 mode_set->x = var->xoffset;
1389 mode_set->y = var->yoffset;
1390
1391 ret = __drm_atomic_helper_set_config(mode_set, state);
1392 if (ret != 0)
1393 goto fail;
1394
1395 plane = mode_set->crtc->primary;
1396 plane_mask |= (1 << drm_plane_index(plane));
1397 plane->old_fb = plane->fb;
1398 }
1399
1400 ret = drm_atomic_commit(state);
1401 if (ret != 0)
1402 goto fail;
1403
1404 info->var.xoffset = var->xoffset;
1405 info->var.yoffset = var->yoffset;
1406
1407fail:
1408 drm_atomic_clean_old_fb(dev, plane_mask, ret);
1409
1410 if (ret == -EDEADLK)
1411 goto backoff;
1412
1413 drm_atomic_state_put(state);
1414 return ret;
1415
1416backoff:
1417 drm_atomic_state_clear(state);
1418 drm_atomic_legacy_backoff(state);
1419
1420 goto retry;
1421}
1422
1423/**
1424 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1425 * @var: updated screen information
1426 * @info: fbdev registered by the helper
1427 */
1428int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1429 struct fb_info *info)
1430{
1431 struct drm_fb_helper *fb_helper = info->par;
1432 struct drm_device *dev = fb_helper->dev;
1433 struct drm_mode_set *modeset;
1434 int ret = 0;
1435 int i;
1436
1437 if (oops_in_progress)
1438 return -EBUSY;
1439
1440 drm_modeset_lock_all(dev);
1441 if (!drm_fb_helper_is_bound(fb_helper)) {
1442 drm_modeset_unlock_all(dev);
1443 return -EBUSY;
1444 }
1445
1446 if (dev->mode_config.funcs->atomic_commit) {
1447 ret = pan_display_atomic(var, info);
1448 goto unlock;
1449 }
1450
1451 for (i = 0; i < fb_helper->crtc_count; i++) {
1452 modeset = &fb_helper->crtc_info[i].mode_set;
1453
1454 modeset->x = var->xoffset;
1455 modeset->y = var->yoffset;
1456
1457 if (modeset->num_connectors) {
1458 ret = drm_mode_set_config_internal(modeset);
1459 if (!ret) {
1460 info->var.xoffset = var->xoffset;
1461 info->var.yoffset = var->yoffset;
1462 }
1463 }
1464 }
1465unlock:
1466 drm_modeset_unlock_all(dev);
1467 return ret;
1468}
1469EXPORT_SYMBOL(drm_fb_helper_pan_display);
1470
1471/*
1472 * Allocates the backing storage and sets up the fbdev info structure through
1473 * the ->fb_probe callback and then registers the fbdev and sets up the panic
1474 * notifier.
1475 */
1476static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1477 int preferred_bpp)
1478{
1479 int ret = 0;
1480 int crtc_count = 0;
1481 int i;
1482 struct drm_fb_helper_surface_size sizes;
1483 int gamma_size = 0;
1484
1485 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1486 sizes.surface_depth = 24;
1487 sizes.surface_bpp = 32;
1488 sizes.fb_width = (unsigned)-1;
1489 sizes.fb_height = (unsigned)-1;
1490
1491 /* if driver picks 8 or 16 by default use that
1492 for both depth/bpp */
1493 if (preferred_bpp != sizes.surface_bpp)
1494 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1495
1496 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1497 drm_fb_helper_for_each_connector(fb_helper, i) {
1498 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1499 struct drm_cmdline_mode *cmdline_mode;
1500
1501 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1502
1503 if (cmdline_mode->bpp_specified) {
1504 switch (cmdline_mode->bpp) {
1505 case 8:
1506 sizes.surface_depth = sizes.surface_bpp = 8;
1507 break;
1508 case 15:
1509 sizes.surface_depth = 15;
1510 sizes.surface_bpp = 16;
1511 break;
1512 case 16:
1513 sizes.surface_depth = sizes.surface_bpp = 16;
1514 break;
1515 case 24:
1516 sizes.surface_depth = sizes.surface_bpp = 24;
1517 break;
1518 case 32:
1519 sizes.surface_depth = 24;
1520 sizes.surface_bpp = 32;
1521 break;
1522 }
1523 break;
1524 }
1525 }
1526
1527 crtc_count = 0;
1528 for (i = 0; i < fb_helper->crtc_count; i++) {
1529 struct drm_display_mode *desired_mode;
1530 struct drm_mode_set *mode_set;
1531 int x, y, j;
1532 /* in case of tile group, are we the last tile vert or horiz?
1533 * If no tile group you are always the last one both vertically
1534 * and horizontally
1535 */
1536 bool lastv = true, lasth = true;
1537
1538 desired_mode = fb_helper->crtc_info[i].desired_mode;
1539 mode_set = &fb_helper->crtc_info[i].mode_set;
1540
1541 if (!desired_mode)
1542 continue;
1543
1544 crtc_count++;
1545
1546 x = fb_helper->crtc_info[i].x;
1547 y = fb_helper->crtc_info[i].y;
1548
1549 if (gamma_size == 0)
1550 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1551
1552 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1553 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1554
1555 for (j = 0; j < mode_set->num_connectors; j++) {
1556 struct drm_connector *connector = mode_set->connectors[j];
1557 if (connector->has_tile) {
1558 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1559 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1560 /* cloning to multiple tiles is just crazy-talk, so: */
1561 break;
1562 }
1563 }
1564
1565 if (lasth)
1566 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1567 if (lastv)
1568 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1569 }
1570
1571 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1572 /* hmm everyone went away - assume VGA cable just fell out
1573 and will come back later. */
1574 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1575 sizes.fb_width = sizes.surface_width = 1024;
1576 sizes.fb_height = sizes.surface_height = 768;
1577 }
1578
1579 /* push down into drivers */
1580 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1581 if (ret < 0)
1582 return ret;
1583
1584 /*
1585 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1586 * events, but at init time drm_setup_crtcs needs to be called before
1587 * the fb is allocated (since we need to figure out the desired size of
1588 * the fb before we can allocate it ...). Hence we need to fix things up
1589 * here again.
1590 */
1591 for (i = 0; i < fb_helper->crtc_count; i++)
1592 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1593 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1594
1595 return 0;
1596}
1597
1598/**
1599 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1600 * @info: fbdev registered by the helper
1601 * @pitch: desired pitch
1602 * @depth: desired depth
1603 *
1604 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1605 * fbdev emulations. Drivers which support acceleration methods which impose
1606 * additional constraints need to set up their own limits.
1607 *
1608 * Drivers should call this (or their equivalent setup code) from their
1609 * ->fb_probe callback.
1610 */
1611void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1612 uint32_t depth)
1613{
1614 info->fix.type = FB_TYPE_PACKED_PIXELS;
1615 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1616 FB_VISUAL_TRUECOLOR;
1617 info->fix.mmio_start = 0;
1618 info->fix.mmio_len = 0;
1619 info->fix.type_aux = 0;
1620 info->fix.xpanstep = 1; /* doing it in hw */
1621 info->fix.ypanstep = 1; /* doing it in hw */
1622 info->fix.ywrapstep = 0;
1623 info->fix.accel = FB_ACCEL_NONE;
1624
1625 info->fix.line_length = pitch;
1626 return;
1627}
1628EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1629
1630/**
1631 * drm_fb_helper_fill_var - initalizes variable fbdev information
1632 * @info: fbdev instance to set up
1633 * @fb_helper: fb helper instance to use as template
1634 * @fb_width: desired fb width
1635 * @fb_height: desired fb height
1636 *
1637 * Sets up the variable fbdev metainformation from the given fb helper instance
1638 * and the drm framebuffer allocated in fb_helper->fb.
1639 *
1640 * Drivers should call this (or their equivalent setup code) from their
1641 * ->fb_probe callback after having allocated the fbdev backing
1642 * storage framebuffer.
1643 */
1644void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1645 uint32_t fb_width, uint32_t fb_height)
1646{
1647 struct drm_framebuffer *fb = fb_helper->fb;
1648 info->pseudo_palette = fb_helper->pseudo_palette;
1649 info->var.xres_virtual = fb->width;
1650 info->var.yres_virtual = fb->height;
1651 info->var.bits_per_pixel = fb->bits_per_pixel;
1652 info->var.accel_flags = FB_ACCELF_TEXT;
1653 info->var.xoffset = 0;
1654 info->var.yoffset = 0;
1655 info->var.activate = FB_ACTIVATE_NOW;
1656 info->var.height = -1;
1657 info->var.width = -1;
1658
1659 switch (fb->depth) {
1660 case 8:
1661 info->var.red.offset = 0;
1662 info->var.green.offset = 0;
1663 info->var.blue.offset = 0;
1664 info->var.red.length = 8; /* 8bit DAC */
1665 info->var.green.length = 8;
1666 info->var.blue.length = 8;
1667 info->var.transp.offset = 0;
1668 info->var.transp.length = 0;
1669 break;
1670 case 15:
1671 info->var.red.offset = 10;
1672 info->var.green.offset = 5;
1673 info->var.blue.offset = 0;
1674 info->var.red.length = 5;
1675 info->var.green.length = 5;
1676 info->var.blue.length = 5;
1677 info->var.transp.offset = 15;
1678 info->var.transp.length = 1;
1679 break;
1680 case 16:
1681 info->var.red.offset = 11;
1682 info->var.green.offset = 5;
1683 info->var.blue.offset = 0;
1684 info->var.red.length = 5;
1685 info->var.green.length = 6;
1686 info->var.blue.length = 5;
1687 info->var.transp.offset = 0;
1688 break;
1689 case 24:
1690 info->var.red.offset = 16;
1691 info->var.green.offset = 8;
1692 info->var.blue.offset = 0;
1693 info->var.red.length = 8;
1694 info->var.green.length = 8;
1695 info->var.blue.length = 8;
1696 info->var.transp.offset = 0;
1697 info->var.transp.length = 0;
1698 break;
1699 case 32:
1700 info->var.red.offset = 16;
1701 info->var.green.offset = 8;
1702 info->var.blue.offset = 0;
1703 info->var.red.length = 8;
1704 info->var.green.length = 8;
1705 info->var.blue.length = 8;
1706 info->var.transp.offset = 24;
1707 info->var.transp.length = 8;
1708 break;
1709 default:
1710 break;
1711 }
1712
1713 info->var.xres = fb_width;
1714 info->var.yres = fb_height;
1715}
1716EXPORT_SYMBOL(drm_fb_helper_fill_var);
1717
1718static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1719 uint32_t maxX,
1720 uint32_t maxY)
1721{
1722 struct drm_connector *connector;
1723 int count = 0;
1724 int i;
1725
1726 drm_fb_helper_for_each_connector(fb_helper, i) {
1727 connector = fb_helper->connector_info[i]->connector;
1728 count += connector->funcs->fill_modes(connector, maxX, maxY);
1729 }
1730
1731 return count;
1732}
1733
1734struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1735{
1736 struct drm_display_mode *mode;
1737
1738 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1739 if (mode->hdisplay > width ||
1740 mode->vdisplay > height)
1741 continue;
1742 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1743 return mode;
1744 }
1745 return NULL;
1746}
1747EXPORT_SYMBOL(drm_has_preferred_mode);
1748
1749static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1750{
1751 return fb_connector->connector->cmdline_mode.specified;
1752}
1753
1754struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1755 int width, int height)
1756{
1757 struct drm_cmdline_mode *cmdline_mode;
1758 struct drm_display_mode *mode;
1759 bool prefer_non_interlace;
1760
1761 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1762 if (cmdline_mode->specified == false)
1763 return NULL;
1764
1765 /* attempt to find a matching mode in the list of modes
1766 * we have gotten so far, if not add a CVT mode that conforms
1767 */
1768 if (cmdline_mode->rb || cmdline_mode->margins)
1769 goto create_mode;
1770
1771 prefer_non_interlace = !cmdline_mode->interlace;
1772again:
1773 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1774 /* check width/height */
1775 if (mode->hdisplay != cmdline_mode->xres ||
1776 mode->vdisplay != cmdline_mode->yres)
1777 continue;
1778
1779 if (cmdline_mode->refresh_specified) {
1780 if (mode->vrefresh != cmdline_mode->refresh)
1781 continue;
1782 }
1783
1784 if (cmdline_mode->interlace) {
1785 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1786 continue;
1787 } else if (prefer_non_interlace) {
1788 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1789 continue;
1790 }
1791 return mode;
1792 }
1793
1794 if (prefer_non_interlace) {
1795 prefer_non_interlace = false;
1796 goto again;
1797 }
1798
1799create_mode:
1800 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1801 cmdline_mode);
1802 list_add(&mode->head, &fb_helper_conn->connector->modes);
1803 return mode;
1804}
1805EXPORT_SYMBOL(drm_pick_cmdline_mode);
1806
1807static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1808{
1809 bool enable;
1810
1811 if (strict)
1812 enable = connector->status == connector_status_connected;
1813 else
1814 enable = connector->status != connector_status_disconnected;
1815
1816 return enable;
1817}
1818
1819static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1820 bool *enabled)
1821{
1822 bool any_enabled = false;
1823 struct drm_connector *connector;
1824 int i = 0;
1825
1826 drm_fb_helper_for_each_connector(fb_helper, i) {
1827 connector = fb_helper->connector_info[i]->connector;
1828 enabled[i] = drm_connector_enabled(connector, true);
1829 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1830 enabled[i] ? "yes" : "no");
1831 any_enabled |= enabled[i];
1832 }
1833
1834 if (any_enabled)
1835 return;
1836
1837 drm_fb_helper_for_each_connector(fb_helper, i) {
1838 connector = fb_helper->connector_info[i]->connector;
1839 enabled[i] = drm_connector_enabled(connector, false);
1840 }
1841}
1842
1843static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1844 struct drm_display_mode **modes,
1845 struct drm_fb_offset *offsets,
1846 bool *enabled, int width, int height)
1847{
1848 int count, i, j;
1849 bool can_clone = false;
1850 struct drm_fb_helper_connector *fb_helper_conn;
1851 struct drm_display_mode *dmt_mode, *mode;
1852
1853 /* only contemplate cloning in the single crtc case */
1854 if (fb_helper->crtc_count > 1)
1855 return false;
1856
1857 count = 0;
1858 drm_fb_helper_for_each_connector(fb_helper, i) {
1859 if (enabled[i])
1860 count++;
1861 }
1862
1863 /* only contemplate cloning if more than one connector is enabled */
1864 if (count <= 1)
1865 return false;
1866
1867 /* check the command line or if nothing common pick 1024x768 */
1868 can_clone = true;
1869 drm_fb_helper_for_each_connector(fb_helper, i) {
1870 if (!enabled[i])
1871 continue;
1872 fb_helper_conn = fb_helper->connector_info[i];
1873 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1874 if (!modes[i]) {
1875 can_clone = false;
1876 break;
1877 }
1878 for (j = 0; j < i; j++) {
1879 if (!enabled[j])
1880 continue;
1881 if (!drm_mode_equal(modes[j], modes[i]))
1882 can_clone = false;
1883 }
1884 }
1885
1886 if (can_clone) {
1887 DRM_DEBUG_KMS("can clone using command line\n");
1888 return true;
1889 }
1890
1891 /* try and find a 1024x768 mode on each connector */
1892 can_clone = true;
1893 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1894
1895 drm_fb_helper_for_each_connector(fb_helper, i) {
1896 if (!enabled[i])
1897 continue;
1898
1899 fb_helper_conn = fb_helper->connector_info[i];
1900 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1901 if (drm_mode_equal(mode, dmt_mode))
1902 modes[i] = mode;
1903 }
1904 if (!modes[i])
1905 can_clone = false;
1906 }
1907
1908 if (can_clone) {
1909 DRM_DEBUG_KMS("can clone using 1024x768\n");
1910 return true;
1911 }
1912 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1913 return false;
1914}
1915
1916static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1917 struct drm_display_mode **modes,
1918 struct drm_fb_offset *offsets,
1919 int idx,
1920 int h_idx, int v_idx)
1921{
1922 struct drm_fb_helper_connector *fb_helper_conn;
1923 int i;
1924 int hoffset = 0, voffset = 0;
1925
1926 drm_fb_helper_for_each_connector(fb_helper, i) {
1927 fb_helper_conn = fb_helper->connector_info[i];
1928 if (!fb_helper_conn->connector->has_tile)
1929 continue;
1930
1931 if (!modes[i] && (h_idx || v_idx)) {
1932 DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1933 fb_helper_conn->connector->base.id);
1934 continue;
1935 }
1936 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1937 hoffset += modes[i]->hdisplay;
1938
1939 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1940 voffset += modes[i]->vdisplay;
1941 }
1942 offsets[idx].x = hoffset;
1943 offsets[idx].y = voffset;
1944 DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1945 return 0;
1946}
1947
1948static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1949 struct drm_display_mode **modes,
1950 struct drm_fb_offset *offsets,
1951 bool *enabled, int width, int height)
1952{
1953 struct drm_fb_helper_connector *fb_helper_conn;
1954 const u64 mask = BIT_ULL(fb_helper->connector_count) - 1;
1955 u64 conn_configured = 0;
1956 int tile_pass = 0;
1957 int i;
1958
1959retry:
1960 drm_fb_helper_for_each_connector(fb_helper, i) {
1961 fb_helper_conn = fb_helper->connector_info[i];
1962
1963 if (conn_configured & BIT_ULL(i))
1964 continue;
1965
1966 if (enabled[i] == false) {
1967 conn_configured |= BIT_ULL(i);
1968 continue;
1969 }
1970
1971 /* first pass over all the untiled connectors */
1972 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1973 continue;
1974
1975 if (tile_pass == 1) {
1976 if (fb_helper_conn->connector->tile_h_loc != 0 ||
1977 fb_helper_conn->connector->tile_v_loc != 0)
1978 continue;
1979
1980 } else {
1981 if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1982 fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1983 /* if this tile_pass doesn't cover any of the tiles - keep going */
1984 continue;
1985
1986 /* find the tile offsets for this pass - need
1987 to find all tiles left and above */
1988 drm_get_tile_offsets(fb_helper, modes, offsets,
1989 i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1990 }
1991 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1992 fb_helper_conn->connector->base.id);
1993
1994 /* got for command line mode first */
1995 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1996 if (!modes[i]) {
1997 DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1998 fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1999 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
2000 }
2001 /* No preferred modes, pick one off the list */
2002 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
2003 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
2004 break;
2005 }
2006 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
2007 "none");
2008 conn_configured |= BIT_ULL(i);
2009 }
2010
2011 if ((conn_configured & mask) != mask) {
2012 tile_pass++;
2013 goto retry;
2014 }
2015 return true;
2016}
2017
2018static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
2019 struct drm_fb_helper_crtc **best_crtcs,
2020 struct drm_display_mode **modes,
2021 int n, int width, int height)
2022{
2023 int c, o;
2024 struct drm_connector *connector;
2025 const struct drm_connector_helper_funcs *connector_funcs;
2026 struct drm_encoder *encoder;
2027 int my_score, best_score, score;
2028 struct drm_fb_helper_crtc **crtcs, *crtc;
2029 struct drm_fb_helper_connector *fb_helper_conn;
2030
2031 if (n == fb_helper->connector_count)
2032 return 0;
2033
2034 fb_helper_conn = fb_helper->connector_info[n];
2035 connector = fb_helper_conn->connector;
2036
2037 best_crtcs[n] = NULL;
2038 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
2039 if (modes[n] == NULL)
2040 return best_score;
2041
2042 crtcs = kzalloc(fb_helper->connector_count *
2043 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2044 if (!crtcs)
2045 return best_score;
2046
2047 my_score = 1;
2048 if (connector->status == connector_status_connected)
2049 my_score++;
2050 if (drm_has_cmdline_mode(fb_helper_conn))
2051 my_score++;
2052 if (drm_has_preferred_mode(fb_helper_conn, width, height))
2053 my_score++;
2054
2055 connector_funcs = connector->helper_private;
2056
2057 /*
2058 * If the DRM device implements atomic hooks and ->best_encoder() is
2059 * NULL we fallback to the default drm_atomic_helper_best_encoder()
2060 * helper.
2061 */
2062 if (fb_helper->dev->mode_config.funcs->atomic_commit &&
2063 !connector_funcs->best_encoder)
2064 encoder = drm_atomic_helper_best_encoder(connector);
2065 else
2066 encoder = connector_funcs->best_encoder(connector);
2067
2068 if (!encoder)
2069 goto out;
2070
2071 /* select a crtc for this connector and then attempt to configure
2072 remaining connectors */
2073 for (c = 0; c < fb_helper->crtc_count; c++) {
2074 crtc = &fb_helper->crtc_info[c];
2075
2076 if ((encoder->possible_crtcs & (1 << c)) == 0)
2077 continue;
2078
2079 for (o = 0; o < n; o++)
2080 if (best_crtcs[o] == crtc)
2081 break;
2082
2083 if (o < n) {
2084 /* ignore cloning unless only a single crtc */
2085 if (fb_helper->crtc_count > 1)
2086 continue;
2087
2088 if (!drm_mode_equal(modes[o], modes[n]))
2089 continue;
2090 }
2091
2092 crtcs[n] = crtc;
2093 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2094 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2095 width, height);
2096 if (score > best_score) {
2097 best_score = score;
2098 memcpy(best_crtcs, crtcs,
2099 fb_helper->connector_count *
2100 sizeof(struct drm_fb_helper_crtc *));
2101 }
2102 }
2103out:
2104 kfree(crtcs);
2105 return best_score;
2106}
2107
2108static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
2109 u32 width, u32 height)
2110{
2111 struct drm_device *dev = fb_helper->dev;
2112 struct drm_fb_helper_crtc **crtcs;
2113 struct drm_display_mode **modes;
2114 struct drm_fb_offset *offsets;
2115 bool *enabled;
2116 int i;
2117
2118 DRM_DEBUG_KMS("\n");
2119 if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
2120 DRM_DEBUG_KMS("No connectors reported connected with modes\n");
2121
2122 /* prevent concurrent modification of connector_count by hotplug */
2123 lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
2124
2125 crtcs = kcalloc(fb_helper->connector_count,
2126 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2127 modes = kcalloc(fb_helper->connector_count,
2128 sizeof(struct drm_display_mode *), GFP_KERNEL);
2129 offsets = kcalloc(fb_helper->connector_count,
2130 sizeof(struct drm_fb_offset), GFP_KERNEL);
2131 enabled = kcalloc(fb_helper->connector_count,
2132 sizeof(bool), GFP_KERNEL);
2133 if (!crtcs || !modes || !enabled || !offsets) {
2134 DRM_ERROR("Memory allocation failed\n");
2135 goto out;
2136 }
2137
2138 drm_enable_connectors(fb_helper, enabled);
2139
2140 if (!(fb_helper->funcs->initial_config &&
2141 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2142 offsets,
2143 enabled, width, height))) {
2144 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2145 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2146 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2147
2148 if (!drm_target_cloned(fb_helper, modes, offsets,
2149 enabled, width, height) &&
2150 !drm_target_preferred(fb_helper, modes, offsets,
2151 enabled, width, height))
2152 DRM_ERROR("Unable to find initial modes\n");
2153
2154 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2155 width, height);
2156
2157 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2158 }
2159
2160 /* need to set the modesets up here for use later */
2161 /* fill out the connector<->crtc mappings into the modesets */
2162 for (i = 0; i < fb_helper->crtc_count; i++)
2163 drm_fb_helper_modeset_release(fb_helper,
2164 &fb_helper->crtc_info[i].mode_set);
2165
2166 drm_fb_helper_for_each_connector(fb_helper, i) {
2167 struct drm_display_mode *mode = modes[i];
2168 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2169 struct drm_fb_offset *offset = &offsets[i];
2170 struct drm_mode_set *modeset = &fb_crtc->mode_set;
2171
2172 if (mode && fb_crtc) {
2173 struct drm_connector *connector =
2174 fb_helper->connector_info[i]->connector;
2175
2176 DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2177 mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2178
2179 fb_crtc->desired_mode = mode;
2180 fb_crtc->x = offset->x;
2181 fb_crtc->y = offset->y;
2182 modeset->mode = drm_mode_duplicate(dev,
2183 fb_crtc->desired_mode);
2184 drm_connector_reference(connector);
2185 modeset->connectors[modeset->num_connectors++] = connector;
2186 modeset->fb = fb_helper->fb;
2187 modeset->x = offset->x;
2188 modeset->y = offset->y;
2189 }
2190 }
2191out:
2192 kfree(crtcs);
2193 kfree(modes);
2194 kfree(offsets);
2195 kfree(enabled);
2196}
2197
2198/**
2199 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2200 * @fb_helper: fb_helper device struct
2201 * @bpp_sel: bpp value to use for the framebuffer configuration
2202 *
2203 * Scans the CRTCs and connectors and tries to put together an initial setup.
2204 * At the moment, this is a cloned configuration across all heads with
2205 * a new framebuffer object as the backing store.
2206 *
2207 * Note that this also registers the fbdev and so allows userspace to call into
2208 * the driver through the fbdev interfaces.
2209 *
2210 * This function will call down into the ->fb_probe callback to let
2211 * the driver allocate and initialize the fbdev info structure and the drm
2212 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2213 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2214 * values for the fbdev info structure.
2215 *
2216 * HANG DEBUGGING:
2217 *
2218 * When you have fbcon support built-in or already loaded, this function will do
2219 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2220 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2221 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2222 * to consoles, not even serial console. This means when your driver crashes,
2223 * you will see absolutely nothing else but a system stuck in this function,
2224 * with no further output. Any kind of printk() you place within your own driver
2225 * or in the drm core modeset code will also never show up.
2226 *
2227 * Standard debug practice is to run the fbcon setup without taking the
2228 * console_lock as a hack, to be able to see backtraces and crashes on the
2229 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2230 * cmdline option.
2231 *
2232 * The other option is to just disable fbdev emulation since very likely the
2233 * first modeset from userspace will crash in the same way, and is even easier
2234 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2235 * kernel cmdline option.
2236 *
2237 * RETURNS:
2238 * Zero if everything went ok, nonzero otherwise.
2239 */
2240int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2241{
2242 struct drm_device *dev = fb_helper->dev;
2243 struct fb_info *info;
2244 int ret;
2245
2246 if (!drm_fbdev_emulation)
2247 return 0;
2248
2249 mutex_lock(&dev->mode_config.mutex);
2250 drm_setup_crtcs(fb_helper,
2251 dev->mode_config.max_width,
2252 dev->mode_config.max_height);
2253 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2254 mutex_unlock(&dev->mode_config.mutex);
2255 if (ret)
2256 return ret;
2257
2258 info = fb_helper->fbdev;
2259 info->var.pixclock = 0;
2260 ret = register_framebuffer(info);
2261 if (ret < 0)
2262 return ret;
2263
2264 dev_info(dev->dev, "fb%d: %s frame buffer device\n",
2265 info->node, info->fix.id);
2266
2267 mutex_lock(&kernel_fb_helper_lock);
2268 if (list_empty(&kernel_fb_helper_list))
2269 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
2270
2271 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
2272 mutex_unlock(&kernel_fb_helper_lock);
2273
2274 return 0;
2275}
2276EXPORT_SYMBOL(drm_fb_helper_initial_config);
2277
2278/**
2279 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2280 * probing all the outputs attached to the fb
2281 * @fb_helper: the drm_fb_helper
2282 *
2283 * Scan the connectors attached to the fb_helper and try to put together a
2284 * setup after notification of a change in output configuration.
2285 *
2286 * Called at runtime, takes the mode config locks to be able to check/change the
2287 * modeset configuration. Must be run from process context (which usually means
2288 * either the output polling work or a work item launched from the driver's
2289 * hotplug interrupt).
2290 *
2291 * Note that drivers may call this even before calling
2292 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2293 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2294 * not miss any hotplug events.
2295 *
2296 * RETURNS:
2297 * 0 on success and a non-zero error code otherwise.
2298 */
2299int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2300{
2301 struct drm_device *dev = fb_helper->dev;
2302
2303 if (!drm_fbdev_emulation)
2304 return 0;
2305
2306 mutex_lock(&dev->mode_config.mutex);
2307 if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2308 fb_helper->delayed_hotplug = true;
2309 mutex_unlock(&dev->mode_config.mutex);
2310 return 0;
2311 }
2312 DRM_DEBUG_KMS("\n");
2313
2314 drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height);
2315
2316 mutex_unlock(&dev->mode_config.mutex);
2317
2318 drm_fb_helper_set_par(fb_helper->fbdev);
2319
2320 return 0;
2321}
2322EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2323
2324/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2325 * but the module doesn't depend on any fb console symbols. At least
2326 * attempt to load fbcon to avoid leaving the system without a usable console.
2327 */
2328int __init drm_fb_helper_modinit(void)
2329{
2330#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2331 const char *name = "fbcon";
2332 struct module *fbcon;
2333
2334 mutex_lock(&module_mutex);
2335 fbcon = find_module(name);
2336 mutex_unlock(&module_mutex);
2337
2338 if (!fbcon)
2339 request_module_nowait(name);
2340#endif
2341 return 0;
2342}
2343EXPORT_SYMBOL(drm_fb_helper_modinit);