1 /*
2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 *
6 * DRM framebuffer helper functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
35 #include <linux/fb.h>
36 #include <linux/module.h>
37 #include <linux/device.h>
38 #include <linux/export.h>
39 #include <linux/list.h>
40 #include <linux/notifier.h>
41 #include <linux/printk.h>
42 #include <linux/sysrq.h>
43 #include <asm/bug.h>
44 #include <drm/drmP.h>
45 #include <drm/drm_crtc.h>
46 #include <drm/drm_fb_helper.h>
47 #include <drm/drm_crtc_helper.h>
48
49 #ifdef __NetBSD__ /* XXX LIST_HEAD means something else */
50 static struct list_head kernel_fb_helper_list =
51 LIST_HEAD_INIT(kernel_fb_helper_list);
52 #else
53 static LIST_HEAD(kernel_fb_helper_list);
54 #endif
55
56 /**
57 * DOC: fbdev helpers
58 *
59 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
60 * mode setting driver. They can be used mostly independantely from the crtc
61 * helper functions used by many drivers to implement the kernel mode setting
62 * interfaces.
63 *
64 * Initialization is done as a three-step process with drm_fb_helper_init(),
65 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
66 * Drivers with fancier requirements than the default beheviour can override the
67 * second step with their own code. Teardown is done with drm_fb_helper_fini().
68 *
69 * At runtime drivers should restore the fbdev console by calling
70 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
71 * should also notify the fb helper code from updates to the output
72 * configuration by calling drm_fb_helper_hotplug_event(). For easier
73 * integration with the output polling code in drm_crtc_helper.c the modeset
74 * code proves a ->output_poll_changed callback.
75 *
76 * All other functions exported by the fb helper library can be used to
77 * implement the fbdev driver interface by the driver.
78 */
79
80 /**
81 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
82 * emulation helper
83 * @fb_helper: fbdev initialized with drm_fb_helper_init
84 *
85 * This functions adds all the available connectors for use with the given
86 * fb_helper. This is a separate step to allow drivers to freely assign
87 * connectors to the fbdev, e.g. if some are reserved for special purposes or
88 * not adequate to be used for the fbcon.
89 *
90 * Since this is part of the initial setup before the fbdev is published, no
91 * locking is required.
92 */
drm_fb_helper_single_add_all_connectors(struct drm_fb_helper * fb_helper)93 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
94 {
95 struct drm_device *dev = fb_helper->dev;
96 struct drm_connector *connector;
97 int i;
98
99 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
100 struct drm_fb_helper_connector *fb_helper_connector;
101
102 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
103 if (!fb_helper_connector)
104 goto fail;
105
106 fb_helper_connector->connector = connector;
107 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
108 }
109 return 0;
110 fail:
111 for (i = 0; i < fb_helper->connector_count; i++) {
112 kfree(fb_helper->connector_info[i]);
113 fb_helper->connector_info[i] = NULL;
114 }
115 fb_helper->connector_count = 0;
116 return -ENOMEM;
117 }
118 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
119
drm_fb_helper_parse_command_line(struct drm_fb_helper * fb_helper)120 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
121 {
122 struct drm_fb_helper_connector *fb_helper_conn;
123 int i;
124
125 for (i = 0; i < fb_helper->connector_count; i++) {
126 struct drm_cmdline_mode *mode;
127 struct drm_connector *connector;
128 char *option = NULL;
129
130 fb_helper_conn = fb_helper->connector_info[i];
131 connector = fb_helper_conn->connector;
132 mode = &fb_helper_conn->cmdline_mode;
133
134 /* do something on return - turn off connector maybe */
135 #if defined(__NetBSD__)
136 prop_dictionary_t prop = device_properties(connector->dev->dev);
137 if (prop_dictionary_get_cstring(prop, drm_get_connector_name(connector), &option) == false)
138 continue;
139 #else
140 if (fb_get_options(drm_get_connector_name(connector), &option))
141 continue;
142 #endif
143
144 if (drm_mode_parse_command_line_for_connector(option,
145 connector,
146 mode)) {
147 if (mode->force) {
148 const char *s;
149 switch (mode->force) {
150 case DRM_FORCE_OFF:
151 s = "OFF";
152 break;
153 case DRM_FORCE_ON_DIGITAL:
154 s = "ON - dig";
155 break;
156 default:
157 case DRM_FORCE_ON:
158 s = "ON";
159 break;
160 }
161
162 DRM_INFO("forcing %s connector %s\n",
163 drm_get_connector_name(connector), s);
164 connector->force = mode->force;
165 }
166
167 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
168 drm_get_connector_name(connector),
169 mode->xres, mode->yres,
170 mode->refresh_specified ? mode->refresh : 60,
171 mode->rb ? " reduced blanking" : "",
172 mode->margins ? " with margins" : "",
173 mode->interlace ? " interlaced" : "");
174 }
175
176 }
177 return 0;
178 }
179
drm_fb_helper_save_lut_atomic(struct drm_crtc * crtc,struct drm_fb_helper * helper)180 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
181 {
182 uint16_t *r_base, *g_base, *b_base;
183 int i;
184
185 if (helper->funcs->gamma_get == NULL)
186 return;
187
188 r_base = crtc->gamma_store;
189 g_base = r_base + crtc->gamma_size;
190 b_base = g_base + crtc->gamma_size;
191
192 for (i = 0; i < crtc->gamma_size; i++)
193 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
194 }
195
drm_fb_helper_restore_lut_atomic(struct drm_crtc * crtc)196 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
197 {
198 uint16_t *r_base, *g_base, *b_base;
199
200 if (crtc->funcs->gamma_set == NULL)
201 return;
202
203 r_base = crtc->gamma_store;
204 g_base = r_base + crtc->gamma_size;
205 b_base = g_base + crtc->gamma_size;
206
207 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
208 }
209
210 /**
211 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
212 * @info: fbdev registered by the helper
213 */
214 #ifndef __NetBSD__
drm_fb_helper_debug_enter(struct fb_info * info)215 int drm_fb_helper_debug_enter(struct fb_info *info)
216 {
217 return drm_fb_helper_debug_enter_fb(info->par);
218 }
219 #endif
220
221 int
drm_fb_helper_debug_enter_fb(struct drm_fb_helper * helper)222 drm_fb_helper_debug_enter_fb(struct drm_fb_helper *helper)
223 {
224 struct drm_crtc_helper_funcs *funcs;
225 int i;
226
227 if (list_empty(&kernel_fb_helper_list))
228 return false;
229
230 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
231 for (i = 0; i < helper->crtc_count; i++) {
232 struct drm_mode_set *mode_set =
233 &helper->crtc_info[i].mode_set;
234
235 if (!mode_set->crtc->enabled)
236 continue;
237
238 funcs = mode_set->crtc->helper_private;
239 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
240 funcs->mode_set_base_atomic(mode_set->crtc,
241 mode_set->fb,
242 mode_set->x,
243 mode_set->y,
244 ENTER_ATOMIC_MODE_SET);
245 }
246 }
247
248 return 0;
249 }
250 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
251
252 /* Find the real fb for a given fb helper CRTC */
drm_mode_config_fb(struct drm_crtc * crtc)253 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
254 {
255 struct drm_device *dev = crtc->dev;
256 struct drm_crtc *c;
257
258 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
259 if (crtc->base.id == c->base.id)
260 return c->primary->fb;
261 }
262
263 return NULL;
264 }
265
266 /**
267 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
268 * @info: fbdev registered by the helper
269 */
270 #ifndef __NetBSD__
drm_fb_helper_debug_leave(struct fb_info * info)271 int drm_fb_helper_debug_leave(struct fb_info *info)
272 {
273 return drm_fb_helper_debug_leave_fb(info->par);
274 }
275 #endif
276
277 int
drm_fb_helper_debug_leave_fb(struct drm_fb_helper * helper)278 drm_fb_helper_debug_leave_fb(struct drm_fb_helper *helper)
279 {
280 struct drm_crtc *crtc;
281 struct drm_crtc_helper_funcs *funcs;
282 struct drm_framebuffer *fb;
283 int i;
284
285 for (i = 0; i < helper->crtc_count; i++) {
286 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
287 crtc = mode_set->crtc;
288 funcs = crtc->helper_private;
289 fb = drm_mode_config_fb(crtc);
290
291 if (!crtc->enabled)
292 continue;
293
294 if (!fb) {
295 DRM_ERROR("no fb to restore??\n");
296 continue;
297 }
298
299 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
300 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
301 crtc->y, LEAVE_ATOMIC_MODE_SET);
302 }
303
304 return 0;
305 }
306 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
307
308 /**
309 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
310 * @fb_helper: fbcon to restore
311 *
312 * This should be called from driver's drm ->lastclose callback
313 * when implementing an fbcon on top of kms using this helper. This ensures that
314 * the user isn't greeted with a black screen when e.g. X dies.
315 */
drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper * fb_helper)316 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
317 {
318 struct drm_device *dev = fb_helper->dev;
319 struct drm_plane *plane;
320 bool error = false;
321 int i;
322
323 drm_warn_on_modeset_not_all_locked(dev);
324
325 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
326 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
327 drm_plane_force_disable(plane);
328
329 for (i = 0; i < fb_helper->crtc_count; i++) {
330 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
331 struct drm_crtc *crtc = mode_set->crtc;
332 int ret;
333
334 if (crtc->funcs->cursor_set) {
335 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
336 if (ret)
337 error = true;
338 }
339
340 ret = drm_mode_set_config_internal(mode_set);
341 if (ret)
342 error = true;
343 }
344 return error;
345 }
346 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
347
348 /*
349 * restore fbcon display for all kms driver's using this helper, used for sysrq
350 * and panic handling.
351 */
drm_fb_helper_force_kernel_mode(void)352 static bool drm_fb_helper_force_kernel_mode(void)
353 {
354 bool ret, error = false;
355 struct drm_fb_helper *helper;
356
357 if (list_empty(&kernel_fb_helper_list))
358 return false;
359
360 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
361 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
362 continue;
363
364 ret = drm_fb_helper_restore_fbdev_mode(helper);
365 if (ret)
366 error = true;
367 }
368 return error;
369 }
370
drm_fb_helper_panic(struct notifier_block * n,unsigned long ununsed,void * panic_str)371 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
372 void *panic_str)
373 {
374 /*
375 * It's a waste of time and effort to switch back to text console
376 * if the kernel should reboot before panic messages can be seen.
377 */
378 if (panic_timeout < 0)
379 return 0;
380
381 pr_err("panic occurred, switching back to text console\n");
382 return drm_fb_helper_force_kernel_mode();
383 }
384
385 static struct notifier_block paniced = {
386 .notifier_call = drm_fb_helper_panic,
387 };
388
drm_fb_helper_is_bound(struct drm_fb_helper * fb_helper)389 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
390 {
391 struct drm_device *dev = fb_helper->dev;
392 struct drm_crtc *crtc;
393 int bound = 0, crtcs_bound = 0;
394
395 /* Sometimes user space wants everything disabled, so don't steal the
396 * display if there's a master. */
397 if (dev->primary->master)
398 return false;
399
400 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
401 if (crtc->primary->fb)
402 crtcs_bound++;
403 if (crtc->primary->fb == fb_helper->fb)
404 bound++;
405 }
406
407 if (bound < crtcs_bound)
408 return false;
409
410 return true;
411 }
412
413 #ifdef CONFIG_MAGIC_SYSRQ
drm_fb_helper_restore_work_fn(struct work_struct * ignored)414 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
415 {
416 bool ret;
417 ret = drm_fb_helper_force_kernel_mode();
418 if (ret == true)
419 DRM_ERROR("Failed to restore crtc configuration\n");
420 }
421 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
422
drm_fb_helper_sysrq(int dummy1)423 static void drm_fb_helper_sysrq(int dummy1)
424 {
425 schedule_work(&drm_fb_helper_restore_work);
426 }
427
428 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
429 .handler = drm_fb_helper_sysrq,
430 .help_msg = "force-fb(V)",
431 .action_msg = "Restore framebuffer console",
432 };
433 #else
434 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op;
435 #endif
436
437 #ifndef __NetBSD__ /* XXX fb info */
drm_fb_helper_dpms(struct fb_info * info,int dpms_mode)438 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
439 {
440 struct drm_fb_helper *fb_helper = info->par;
441 struct drm_device *dev = fb_helper->dev;
442 struct drm_crtc *crtc;
443 struct drm_connector *connector;
444 int i, j;
445
446 /*
447 * fbdev->blank can be called from irq context in case of a panic.
448 * Since we already have our own special panic handler which will
449 * restore the fbdev console mode completely, just bail out early.
450 */
451 if (oops_in_progress)
452 return;
453
454 /*
455 * For each CRTC in this fb, turn the connectors on/off.
456 */
457 drm_modeset_lock_all(dev);
458 if (!drm_fb_helper_is_bound(fb_helper)) {
459 drm_modeset_unlock_all(dev);
460 return;
461 }
462
463 for (i = 0; i < fb_helper->crtc_count; i++) {
464 crtc = fb_helper->crtc_info[i].mode_set.crtc;
465
466 if (!crtc->enabled)
467 continue;
468
469 /* Walk the connectors & encoders on this fb turning them on/off */
470 for (j = 0; j < fb_helper->connector_count; j++) {
471 connector = fb_helper->connector_info[j]->connector;
472 connector->funcs->dpms(connector, dpms_mode);
473 drm_object_property_set_value(&connector->base,
474 dev->mode_config.dpms_property, dpms_mode);
475 }
476 }
477 drm_modeset_unlock_all(dev);
478 }
479
480 /**
481 * drm_fb_helper_blank - implementation for ->fb_blank
482 * @blank: desired blanking state
483 * @info: fbdev registered by the helper
484 */
drm_fb_helper_blank(int blank,struct fb_info * info)485 int drm_fb_helper_blank(int blank, struct fb_info *info)
486 {
487 switch (blank) {
488 /* Display: On; HSync: On, VSync: On */
489 case FB_BLANK_UNBLANK:
490 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
491 break;
492 /* Display: Off; HSync: On, VSync: On */
493 case FB_BLANK_NORMAL:
494 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
495 break;
496 /* Display: Off; HSync: Off, VSync: On */
497 case FB_BLANK_HSYNC_SUSPEND:
498 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
499 break;
500 /* Display: Off; HSync: On, VSync: Off */
501 case FB_BLANK_VSYNC_SUSPEND:
502 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
503 break;
504 /* Display: Off; HSync: Off, VSync: Off */
505 case FB_BLANK_POWERDOWN:
506 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
507 break;
508 }
509 return 0;
510 }
511 EXPORT_SYMBOL(drm_fb_helper_blank);
512 #endif
513
drm_fb_helper_crtc_free(struct drm_fb_helper * helper)514 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
515 {
516 int i;
517
518 for (i = 0; i < helper->connector_count; i++)
519 kfree(helper->connector_info[i]);
520 kfree(helper->connector_info);
521 for (i = 0; i < helper->crtc_count; i++) {
522 kfree(helper->crtc_info[i].mode_set.connectors);
523 if (helper->crtc_info[i].mode_set.mode)
524 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
525 }
526 kfree(helper->crtc_info);
527 }
528
529 /**
530 * drm_fb_helper_init - initialize a drm_fb_helper structure
531 * @dev: drm device
532 * @fb_helper: driver-allocated fbdev helper structure to initialize
533 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
534 * @max_conn_count: max connector count
535 *
536 * This allocates the structures for the fbdev helper with the given limits.
537 * Note that this won't yet touch the hardware (through the driver interfaces)
538 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
539 * to allow driver writes more control over the exact init sequence.
540 *
541 * Drivers must set fb_helper->funcs before calling
542 * drm_fb_helper_initial_config().
543 *
544 * RETURNS:
545 * Zero if everything went ok, nonzero otherwise.
546 */
drm_fb_helper_init(struct drm_device * dev,struct drm_fb_helper * fb_helper,int crtc_count,int max_conn_count)547 int drm_fb_helper_init(struct drm_device *dev,
548 struct drm_fb_helper *fb_helper,
549 int crtc_count, int max_conn_count)
550 {
551 struct drm_crtc *crtc;
552 int i;
553
554 if (!max_conn_count)
555 return -EINVAL;
556
557 fb_helper->dev = dev;
558
559 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
560
561 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
562 if (!fb_helper->crtc_info)
563 return -ENOMEM;
564
565 fb_helper->crtc_count = crtc_count;
566 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
567 if (!fb_helper->connector_info) {
568 kfree(fb_helper->crtc_info);
569 return -ENOMEM;
570 }
571 fb_helper->connector_count = 0;
572
573 for (i = 0; i < crtc_count; i++) {
574 fb_helper->crtc_info[i].mode_set.connectors =
575 kcalloc(max_conn_count,
576 sizeof(struct drm_connector *),
577 GFP_KERNEL);
578
579 if (!fb_helper->crtc_info[i].mode_set.connectors)
580 goto out_free;
581 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
582 }
583
584 i = 0;
585 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
586 fb_helper->crtc_info[i].mode_set.crtc = crtc;
587 i++;
588 }
589
590 return 0;
591 out_free:
592 drm_fb_helper_crtc_free(fb_helper);
593 return -ENOMEM;
594 }
595 EXPORT_SYMBOL(drm_fb_helper_init);
596
drm_fb_helper_fini(struct drm_fb_helper * fb_helper)597 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
598 {
599 if (!list_empty(&fb_helper->kernel_fb_list)) {
600 list_del(&fb_helper->kernel_fb_list);
601 if (list_empty(&kernel_fb_helper_list)) {
602 pr_info("drm: unregistered panic notifier\n");
603 atomic_notifier_chain_unregister(&panic_notifier_list,
604 &paniced);
605 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
606 }
607 }
608
609 drm_fb_helper_crtc_free(fb_helper);
610
611 }
612 EXPORT_SYMBOL(drm_fb_helper_fini);
613
614 #ifndef __NetBSD__ /* XXX fb info */
setcolreg(struct drm_crtc * crtc,u16 red,u16 green,u16 blue,u16 regno,struct fb_info * info)615 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
616 u16 blue, u16 regno, struct fb_info *info)
617 {
618 struct drm_fb_helper *fb_helper = info->par;
619 struct drm_framebuffer *fb = fb_helper->fb;
620 int pindex;
621
622 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
623 u32 *palette;
624 u32 value;
625 /* place color in psuedopalette */
626 if (regno > 16)
627 return -EINVAL;
628 palette = (u32 *)info->pseudo_palette;
629 red >>= (16 - info->var.red.length);
630 green >>= (16 - info->var.green.length);
631 blue >>= (16 - info->var.blue.length);
632 value = (red << info->var.red.offset) |
633 (green << info->var.green.offset) |
634 (blue << info->var.blue.offset);
635 if (info->var.transp.length > 0) {
636 u32 mask = (1 << info->var.transp.length) - 1;
637 mask <<= info->var.transp.offset;
638 value |= mask;
639 }
640 palette[regno] = value;
641 return 0;
642 }
643
644 /*
645 * The driver really shouldn't advertise pseudo/directcolor
646 * visuals if it can't deal with the palette.
647 */
648 if (WARN_ON(!fb_helper->funcs->gamma_set ||
649 !fb_helper->funcs->gamma_get))
650 return -EINVAL;
651
652 pindex = regno;
653
654 if (fb->bits_per_pixel == 16) {
655 pindex = regno << 3;
656
657 if (fb->depth == 16 && regno > 63)
658 return -EINVAL;
659 if (fb->depth == 15 && regno > 31)
660 return -EINVAL;
661
662 if (fb->depth == 16) {
663 u16 r, g, b;
664 int i;
665 if (regno < 32) {
666 for (i = 0; i < 8; i++)
667 fb_helper->funcs->gamma_set(crtc, red,
668 green, blue, pindex + i);
669 }
670
671 fb_helper->funcs->gamma_get(crtc, &r,
672 &g, &b,
673 pindex >> 1);
674
675 for (i = 0; i < 4; i++)
676 fb_helper->funcs->gamma_set(crtc, r,
677 green, b,
678 (pindex >> 1) + i);
679 }
680 }
681
682 if (fb->depth != 16)
683 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
684 return 0;
685 }
686
687 /**
688 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
689 * @cmap: cmap to set
690 * @info: fbdev registered by the helper
691 */
drm_fb_helper_setcmap(struct fb_cmap * cmap,struct fb_info * info)692 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
693 {
694 struct drm_fb_helper *fb_helper = info->par;
695 struct drm_device *dev = fb_helper->dev;
696 struct drm_crtc_helper_funcs *crtc_funcs;
697 u16 *red, *green, *blue, *transp;
698 struct drm_crtc *crtc;
699 int i, j, rc = 0;
700 int start;
701
702 drm_modeset_lock_all(dev);
703 if (!drm_fb_helper_is_bound(fb_helper)) {
704 drm_modeset_unlock_all(dev);
705 return -EBUSY;
706 }
707
708 for (i = 0; i < fb_helper->crtc_count; i++) {
709 crtc = fb_helper->crtc_info[i].mode_set.crtc;
710 crtc_funcs = crtc->helper_private;
711
712 red = cmap->red;
713 green = cmap->green;
714 blue = cmap->blue;
715 transp = cmap->transp;
716 start = cmap->start;
717
718 for (j = 0; j < cmap->len; j++) {
719 u16 hred, hgreen, hblue, htransp = 0xffff;
720
721 hred = *red++;
722 hgreen = *green++;
723 hblue = *blue++;
724
725 if (transp)
726 htransp = *transp++;
727
728 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
729 if (rc)
730 goto out;
731 }
732 if (crtc_funcs->load_lut)
733 crtc_funcs->load_lut(crtc);
734 }
735 out:
736 drm_modeset_unlock_all(dev);
737 return rc;
738 }
739 EXPORT_SYMBOL(drm_fb_helper_setcmap);
740
741 /**
742 * drm_fb_helper_check_var - implementation for ->fb_check_var
743 * @var: screeninfo to check
744 * @info: fbdev registered by the helper
745 */
drm_fb_helper_check_var(struct fb_var_screeninfo * var,struct fb_info * info)746 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
747 struct fb_info *info)
748 {
749 struct drm_fb_helper *fb_helper = info->par;
750 struct drm_framebuffer *fb = fb_helper->fb;
751 int depth;
752
753 if (var->pixclock != 0 || in_dbg_master())
754 return -EINVAL;
755
756 /* Need to resize the fb object !!! */
757 if (var->bits_per_pixel > fb->bits_per_pixel ||
758 var->xres > fb->width || var->yres > fb->height ||
759 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
760 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
761 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
762 var->xres, var->yres, var->bits_per_pixel,
763 var->xres_virtual, var->yres_virtual,
764 fb->width, fb->height, fb->bits_per_pixel);
765 return -EINVAL;
766 }
767
768 switch (var->bits_per_pixel) {
769 case 16:
770 depth = (var->green.length == 6) ? 16 : 15;
771 break;
772 case 32:
773 depth = (var->transp.length > 0) ? 32 : 24;
774 break;
775 default:
776 depth = var->bits_per_pixel;
777 break;
778 }
779
780 switch (depth) {
781 case 8:
782 var->red.offset = 0;
783 var->green.offset = 0;
784 var->blue.offset = 0;
785 var->red.length = 8;
786 var->green.length = 8;
787 var->blue.length = 8;
788 var->transp.length = 0;
789 var->transp.offset = 0;
790 break;
791 case 15:
792 var->red.offset = 10;
793 var->green.offset = 5;
794 var->blue.offset = 0;
795 var->red.length = 5;
796 var->green.length = 5;
797 var->blue.length = 5;
798 var->transp.length = 1;
799 var->transp.offset = 15;
800 break;
801 case 16:
802 var->red.offset = 11;
803 var->green.offset = 5;
804 var->blue.offset = 0;
805 var->red.length = 5;
806 var->green.length = 6;
807 var->blue.length = 5;
808 var->transp.length = 0;
809 var->transp.offset = 0;
810 break;
811 case 24:
812 var->red.offset = 16;
813 var->green.offset = 8;
814 var->blue.offset = 0;
815 var->red.length = 8;
816 var->green.length = 8;
817 var->blue.length = 8;
818 var->transp.length = 0;
819 var->transp.offset = 0;
820 break;
821 case 32:
822 var->red.offset = 16;
823 var->green.offset = 8;
824 var->blue.offset = 0;
825 var->red.length = 8;
826 var->green.length = 8;
827 var->blue.length = 8;
828 var->transp.length = 8;
829 var->transp.offset = 24;
830 break;
831 default:
832 return -EINVAL;
833 }
834 return 0;
835 }
836 EXPORT_SYMBOL(drm_fb_helper_check_var);
837 #endif
838
839 #ifndef __NetBSD__ /* XXX fb info */
840 /**
841 * drm_fb_helper_set_par - implementation for ->fb_set_par
842 * @info: fbdev registered by the helper
843 *
844 * This will let fbcon do the mode init and is called at initialization time by
845 * the fbdev core when registering the driver, and later on through the hotplug
846 * callback.
847 */
drm_fb_helper_set_par(struct fb_info * info)848 int drm_fb_helper_set_par(struct fb_info *info)
849 {
850 struct drm_fb_helper *fb_helper = info->par;
851 struct fb_var_screeninfo *var = &info->var;
852
853 if (var->pixclock != 0) {
854 DRM_ERROR("PIXEL CLOCK SET\n");
855 return -EINVAL;
856 }
857
858 return drm_fb_helper_set_config(fb_helper);
859 }
860 EXPORT_SYMBOL(drm_fb_helper_set_par);
861 #endif
862
863 int
drm_fb_helper_set_config(struct drm_fb_helper * fb_helper)864 drm_fb_helper_set_config(struct drm_fb_helper *fb_helper)
865 {
866 struct drm_device *dev = fb_helper->dev;
867
868 drm_modeset_lock_all(dev);
869 drm_fb_helper_restore_fbdev_mode(fb_helper);
870 drm_modeset_unlock_all(dev);
871
872 if (fb_helper->delayed_hotplug) {
873 fb_helper->delayed_hotplug = false;
874 drm_fb_helper_hotplug_event(fb_helper);
875 }
876 return 0;
877 }
878
879 #ifndef __NetBSD__ /* XXX fb info */
880 /**
881 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
882 * @var: updated screen information
883 * @info: fbdev registered by the helper
884 */
drm_fb_helper_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)885 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
886 struct fb_info *info)
887 {
888 struct drm_fb_helper *fb_helper = info->par;
889 struct drm_device *dev = fb_helper->dev;
890 struct drm_mode_set *modeset;
891 int ret = 0;
892 int i;
893
894 drm_modeset_lock_all(dev);
895 if (!drm_fb_helper_is_bound(fb_helper)) {
896 drm_modeset_unlock_all(dev);
897 return -EBUSY;
898 }
899
900 for (i = 0; i < fb_helper->crtc_count; i++) {
901 modeset = &fb_helper->crtc_info[i].mode_set;
902
903 modeset->x = var->xoffset;
904 modeset->y = var->yoffset;
905
906 if (modeset->num_connectors) {
907 ret = drm_mode_set_config_internal(modeset);
908 if (!ret) {
909 info->var.xoffset = var->xoffset;
910 info->var.yoffset = var->yoffset;
911 }
912 }
913 }
914 drm_modeset_unlock_all(dev);
915 return ret;
916 }
917 EXPORT_SYMBOL(drm_fb_helper_pan_display);
918 #endif
919
920 /*
921 * Allocates the backing storage and sets up the fbdev info structure through
922 * the ->fb_probe callback and then registers the fbdev and sets up the panic
923 * notifier.
924 */
drm_fb_helper_single_fb_probe(struct drm_fb_helper * fb_helper,int preferred_bpp)925 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
926 int preferred_bpp)
927 {
928 int ret = 0;
929 int crtc_count = 0;
930 int i;
931 #ifndef __NetBSD__ /* XXX fb info */
932 struct fb_info *info;
933 #endif
934 struct drm_fb_helper_surface_size sizes;
935 int gamma_size = 0;
936
937 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
938 sizes.surface_depth = 24;
939 sizes.surface_bpp = 32;
940 sizes.fb_width = (unsigned)-1;
941 sizes.fb_height = (unsigned)-1;
942
943 /* if driver picks 8 or 16 by default use that
944 for both depth/bpp */
945 if (preferred_bpp != sizes.surface_bpp)
946 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
947
948 /* first up get a count of crtcs now in use and new min/maxes width/heights */
949 for (i = 0; i < fb_helper->connector_count; i++) {
950 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
951 struct drm_cmdline_mode *cmdline_mode;
952
953 cmdline_mode = &fb_helper_conn->cmdline_mode;
954
955 if (cmdline_mode->bpp_specified) {
956 switch (cmdline_mode->bpp) {
957 case 8:
958 sizes.surface_depth = sizes.surface_bpp = 8;
959 break;
960 case 15:
961 sizes.surface_depth = 15;
962 sizes.surface_bpp = 16;
963 break;
964 case 16:
965 sizes.surface_depth = sizes.surface_bpp = 16;
966 break;
967 case 24:
968 sizes.surface_depth = sizes.surface_bpp = 24;
969 break;
970 case 32:
971 sizes.surface_depth = 24;
972 sizes.surface_bpp = 32;
973 break;
974 }
975 break;
976 }
977 }
978
979 crtc_count = 0;
980 for (i = 0; i < fb_helper->crtc_count; i++) {
981 struct drm_display_mode *desired_mode;
982 desired_mode = fb_helper->crtc_info[i].desired_mode;
983
984 if (desired_mode) {
985 if (gamma_size == 0)
986 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
987 if (desired_mode->hdisplay < sizes.fb_width)
988 sizes.fb_width = desired_mode->hdisplay;
989 if (desired_mode->vdisplay < sizes.fb_height)
990 sizes.fb_height = desired_mode->vdisplay;
991 if (desired_mode->hdisplay > sizes.surface_width)
992 sizes.surface_width = desired_mode->hdisplay;
993 if (desired_mode->vdisplay > sizes.surface_height)
994 sizes.surface_height = desired_mode->vdisplay;
995 crtc_count++;
996 }
997 }
998
999 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1000 /* hmm everyone went away - assume VGA cable just fell out
1001 and will come back later. */
1002 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1003 sizes.fb_width = sizes.surface_width = 1024;
1004 sizes.fb_height = sizes.surface_height = 768;
1005 }
1006
1007 /* push down into drivers */
1008 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1009 if (ret < 0)
1010 return ret;
1011
1012 #ifndef __NetBSD__ /* XXX fb info */
1013 info = fb_helper->fbdev;
1014 #endif
1015
1016 /*
1017 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1018 * events, but at init time drm_setup_crtcs needs to be called before
1019 * the fb is allocated (since we need to figure out the desired size of
1020 * the fb before we can allocate it ...). Hence we need to fix things up
1021 * here again.
1022 */
1023 for (i = 0; i < fb_helper->crtc_count; i++)
1024 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1025 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1026
1027 #ifndef __NetBSD__ /* XXX fb info */
1028 info->var.pixclock = 0;
1029 if (register_framebuffer(info) < 0)
1030 return -EINVAL;
1031
1032 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1033 info->node, info->fix.id);
1034 #endif
1035
1036 /* Switch back to kernel console on panic */
1037 /* multi card linked list maybe */
1038 if (list_empty(&kernel_fb_helper_list)) {
1039 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1040 atomic_notifier_chain_register(&panic_notifier_list,
1041 &paniced);
1042 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1043 }
1044
1045 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1046
1047 return 0;
1048 }
1049
1050 #ifndef __NetBSD__ /* XXX fb info */
1051 /**
1052 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1053 * @info: fbdev registered by the helper
1054 * @pitch: desired pitch
1055 * @depth: desired depth
1056 *
1057 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1058 * fbdev emulations. Drivers which support acceleration methods which impose
1059 * additional constraints need to set up their own limits.
1060 *
1061 * Drivers should call this (or their equivalent setup code) from their
1062 * ->fb_probe callback.
1063 */
drm_fb_helper_fill_fix(struct fb_info * info,uint32_t pitch,uint32_t depth)1064 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1065 uint32_t depth)
1066 {
1067 info->fix.type = FB_TYPE_PACKED_PIXELS;
1068 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1069 FB_VISUAL_TRUECOLOR;
1070 info->fix.mmio_start = 0;
1071 info->fix.mmio_len = 0;
1072 info->fix.type_aux = 0;
1073 info->fix.xpanstep = 1; /* doing it in hw */
1074 info->fix.ypanstep = 1; /* doing it in hw */
1075 info->fix.ywrapstep = 0;
1076 info->fix.accel = FB_ACCEL_NONE;
1077 info->fix.type_aux = 0;
1078
1079 info->fix.line_length = pitch;
1080 return;
1081 }
1082 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1083
1084 /**
1085 * drm_fb_helper_fill_var - initalizes variable fbdev information
1086 * @info: fbdev instance to set up
1087 * @fb_helper: fb helper instance to use as template
1088 * @fb_width: desired fb width
1089 * @fb_height: desired fb height
1090 *
1091 * Sets up the variable fbdev metainformation from the given fb helper instance
1092 * and the drm framebuffer allocated in fb_helper->fb.
1093 *
1094 * Drivers should call this (or their equivalent setup code) from their
1095 * ->fb_probe callback after having allocated the fbdev backing
1096 * storage framebuffer.
1097 */
drm_fb_helper_fill_var(struct fb_info * info,struct drm_fb_helper * fb_helper,uint32_t fb_width,uint32_t fb_height)1098 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1099 uint32_t fb_width, uint32_t fb_height)
1100 {
1101 struct drm_framebuffer *fb = fb_helper->fb;
1102 info->pseudo_palette = fb_helper->pseudo_palette;
1103 info->var.xres_virtual = fb->width;
1104 info->var.yres_virtual = fb->height;
1105 info->var.bits_per_pixel = fb->bits_per_pixel;
1106 info->var.accel_flags = FB_ACCELF_TEXT;
1107 info->var.xoffset = 0;
1108 info->var.yoffset = 0;
1109 info->var.activate = FB_ACTIVATE_NOW;
1110 info->var.height = -1;
1111 info->var.width = -1;
1112
1113 switch (fb->depth) {
1114 case 8:
1115 info->var.red.offset = 0;
1116 info->var.green.offset = 0;
1117 info->var.blue.offset = 0;
1118 info->var.red.length = 8; /* 8bit DAC */
1119 info->var.green.length = 8;
1120 info->var.blue.length = 8;
1121 info->var.transp.offset = 0;
1122 info->var.transp.length = 0;
1123 break;
1124 case 15:
1125 info->var.red.offset = 10;
1126 info->var.green.offset = 5;
1127 info->var.blue.offset = 0;
1128 info->var.red.length = 5;
1129 info->var.green.length = 5;
1130 info->var.blue.length = 5;
1131 info->var.transp.offset = 15;
1132 info->var.transp.length = 1;
1133 break;
1134 case 16:
1135 info->var.red.offset = 11;
1136 info->var.green.offset = 5;
1137 info->var.blue.offset = 0;
1138 info->var.red.length = 5;
1139 info->var.green.length = 6;
1140 info->var.blue.length = 5;
1141 info->var.transp.offset = 0;
1142 break;
1143 case 24:
1144 info->var.red.offset = 16;
1145 info->var.green.offset = 8;
1146 info->var.blue.offset = 0;
1147 info->var.red.length = 8;
1148 info->var.green.length = 8;
1149 info->var.blue.length = 8;
1150 info->var.transp.offset = 0;
1151 info->var.transp.length = 0;
1152 break;
1153 case 32:
1154 info->var.red.offset = 16;
1155 info->var.green.offset = 8;
1156 info->var.blue.offset = 0;
1157 info->var.red.length = 8;
1158 info->var.green.length = 8;
1159 info->var.blue.length = 8;
1160 info->var.transp.offset = 24;
1161 info->var.transp.length = 8;
1162 break;
1163 default:
1164 break;
1165 }
1166
1167 info->var.xres = fb_width;
1168 info->var.yres = fb_height;
1169 }
1170 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1171 #endif
1172
drm_fb_helper_probe_connector_modes(struct drm_fb_helper * fb_helper,uint32_t maxX,uint32_t maxY)1173 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1174 uint32_t maxX,
1175 uint32_t maxY)
1176 {
1177 struct drm_connector *connector;
1178 int count = 0;
1179 int i;
1180
1181 for (i = 0; i < fb_helper->connector_count; i++) {
1182 connector = fb_helper->connector_info[i]->connector;
1183 count += connector->funcs->fill_modes(connector, maxX, maxY);
1184 }
1185
1186 return count;
1187 }
1188
drm_has_preferred_mode(struct drm_fb_helper_connector * fb_connector,int width,int height)1189 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1190 {
1191 struct drm_display_mode *mode;
1192
1193 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1194 if (mode->hdisplay > width ||
1195 mode->vdisplay > height)
1196 continue;
1197 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1198 return mode;
1199 }
1200 return NULL;
1201 }
1202 EXPORT_SYMBOL(drm_has_preferred_mode);
1203
drm_has_cmdline_mode(struct drm_fb_helper_connector * fb_connector)1204 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1205 {
1206 struct drm_cmdline_mode *cmdline_mode;
1207 cmdline_mode = &fb_connector->cmdline_mode;
1208 return cmdline_mode->specified;
1209 }
1210
drm_pick_cmdline_mode(struct drm_fb_helper_connector * fb_helper_conn,int width,int height)1211 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1212 int width, int height)
1213 {
1214 struct drm_cmdline_mode *cmdline_mode;
1215 struct drm_display_mode *mode = NULL;
1216 bool prefer_non_interlace;
1217
1218 cmdline_mode = &fb_helper_conn->cmdline_mode;
1219 if (cmdline_mode->specified == false)
1220 return mode;
1221
1222 /* attempt to find a matching mode in the list of modes
1223 * we have gotten so far, if not add a CVT mode that conforms
1224 */
1225 if (cmdline_mode->rb || cmdline_mode->margins)
1226 goto create_mode;
1227
1228 prefer_non_interlace = !cmdline_mode->interlace;
1229 again:
1230 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1231 /* check width/height */
1232 if (mode->hdisplay != cmdline_mode->xres ||
1233 mode->vdisplay != cmdline_mode->yres)
1234 continue;
1235
1236 if (cmdline_mode->refresh_specified) {
1237 if (mode->vrefresh != cmdline_mode->refresh)
1238 continue;
1239 }
1240
1241 if (cmdline_mode->interlace) {
1242 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1243 continue;
1244 } else if (prefer_non_interlace) {
1245 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1246 continue;
1247 }
1248 return mode;
1249 }
1250
1251 if (prefer_non_interlace) {
1252 prefer_non_interlace = false;
1253 goto again;
1254 }
1255
1256 create_mode:
1257 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1258 cmdline_mode);
1259 list_add(&mode->head, &fb_helper_conn->connector->modes);
1260 return mode;
1261 }
1262 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1263
drm_connector_enabled(struct drm_connector * connector,bool strict)1264 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1265 {
1266 bool enable;
1267
1268 if (strict)
1269 enable = connector->status == connector_status_connected;
1270 else
1271 enable = connector->status != connector_status_disconnected;
1272
1273 return enable;
1274 }
1275
drm_enable_connectors(struct drm_fb_helper * fb_helper,bool * enabled)1276 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1277 bool *enabled)
1278 {
1279 bool any_enabled = false;
1280 struct drm_connector *connector;
1281 int i = 0;
1282
1283 for (i = 0; i < fb_helper->connector_count; i++) {
1284 connector = fb_helper->connector_info[i]->connector;
1285 enabled[i] = drm_connector_enabled(connector, true);
1286 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1287 enabled[i] ? "yes" : "no");
1288 any_enabled |= enabled[i];
1289 }
1290
1291 if (any_enabled)
1292 return;
1293
1294 for (i = 0; i < fb_helper->connector_count; i++) {
1295 connector = fb_helper->connector_info[i]->connector;
1296 enabled[i] = drm_connector_enabled(connector, false);
1297 }
1298 }
1299
drm_target_cloned(struct drm_fb_helper * fb_helper,struct drm_display_mode ** modes,bool * enabled,int width,int height)1300 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1301 struct drm_display_mode **modes,
1302 bool *enabled, int width, int height)
1303 {
1304 int count, i, j;
1305 bool can_clone = false;
1306 struct drm_fb_helper_connector *fb_helper_conn;
1307 struct drm_display_mode *dmt_mode, *mode;
1308
1309 /* only contemplate cloning in the single crtc case */
1310 if (fb_helper->crtc_count > 1)
1311 return false;
1312
1313 count = 0;
1314 for (i = 0; i < fb_helper->connector_count; i++) {
1315 if (enabled[i])
1316 count++;
1317 }
1318
1319 /* only contemplate cloning if more than one connector is enabled */
1320 if (count <= 1)
1321 return false;
1322
1323 /* check the command line or if nothing common pick 1024x768 */
1324 can_clone = true;
1325 for (i = 0; i < fb_helper->connector_count; i++) {
1326 if (!enabled[i])
1327 continue;
1328 fb_helper_conn = fb_helper->connector_info[i];
1329 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1330 if (!modes[i]) {
1331 can_clone = false;
1332 break;
1333 }
1334 for (j = 0; j < i; j++) {
1335 if (!enabled[j])
1336 continue;
1337 if (!drm_mode_equal(modes[j], modes[i]))
1338 can_clone = false;
1339 }
1340 }
1341
1342 if (can_clone) {
1343 DRM_DEBUG_KMS("can clone using command line\n");
1344 return true;
1345 }
1346
1347 /* try and find a 1024x768 mode on each connector */
1348 can_clone = true;
1349 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1350
1351 for (i = 0; i < fb_helper->connector_count; i++) {
1352
1353 if (!enabled[i])
1354 continue;
1355
1356 fb_helper_conn = fb_helper->connector_info[i];
1357 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1358 if (drm_mode_equal(mode, dmt_mode))
1359 modes[i] = mode;
1360 }
1361 if (!modes[i])
1362 can_clone = false;
1363 }
1364
1365 if (can_clone) {
1366 DRM_DEBUG_KMS("can clone using 1024x768\n");
1367 return true;
1368 }
1369 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1370 return false;
1371 }
1372
drm_target_preferred(struct drm_fb_helper * fb_helper,struct drm_display_mode ** modes,bool * enabled,int width,int height)1373 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1374 struct drm_display_mode **modes,
1375 bool *enabled, int width, int height)
1376 {
1377 struct drm_fb_helper_connector *fb_helper_conn;
1378 int i;
1379
1380 for (i = 0; i < fb_helper->connector_count; i++) {
1381 fb_helper_conn = fb_helper->connector_info[i];
1382
1383 if (enabled[i] == false)
1384 continue;
1385
1386 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1387 fb_helper_conn->connector->base.id);
1388
1389 /* got for command line mode first */
1390 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1391 if (!modes[i]) {
1392 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1393 fb_helper_conn->connector->base.id);
1394 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1395 }
1396 /* No preferred modes, pick one off the list */
1397 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1398 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1399 break;
1400 }
1401 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1402 "none");
1403 }
1404 return true;
1405 }
1406
drm_pick_crtcs(struct drm_fb_helper * fb_helper,struct drm_fb_helper_crtc ** best_crtcs,struct drm_display_mode ** modes,int n,int width,int height)1407 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1408 struct drm_fb_helper_crtc **best_crtcs,
1409 struct drm_display_mode **modes,
1410 int n, int width, int height)
1411 {
1412 int c, o;
1413 struct drm_device *dev = fb_helper->dev;
1414 struct drm_connector *connector;
1415 struct drm_connector_helper_funcs *connector_funcs;
1416 struct drm_encoder *encoder;
1417 int my_score, best_score, score;
1418 struct drm_fb_helper_crtc **crtcs, *crtc;
1419 struct drm_fb_helper_connector *fb_helper_conn;
1420
1421 if (n == fb_helper->connector_count)
1422 return 0;
1423
1424 fb_helper_conn = fb_helper->connector_info[n];
1425 connector = fb_helper_conn->connector;
1426
1427 best_crtcs[n] = NULL;
1428 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1429 if (modes[n] == NULL)
1430 return best_score;
1431
1432 crtcs = kzalloc(dev->mode_config.num_connector *
1433 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1434 if (!crtcs)
1435 return best_score;
1436
1437 my_score = 1;
1438 if (connector->status == connector_status_connected)
1439 my_score++;
1440 if (drm_has_cmdline_mode(fb_helper_conn))
1441 my_score++;
1442 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1443 my_score++;
1444
1445 connector_funcs = connector->helper_private;
1446 encoder = connector_funcs->best_encoder(connector);
1447 if (!encoder)
1448 goto out;
1449
1450 /* select a crtc for this connector and then attempt to configure
1451 remaining connectors */
1452 for (c = 0; c < fb_helper->crtc_count; c++) {
1453 crtc = &fb_helper->crtc_info[c];
1454
1455 if ((encoder->possible_crtcs & (1 << c)) == 0)
1456 continue;
1457
1458 for (o = 0; o < n; o++)
1459 if (best_crtcs[o] == crtc)
1460 break;
1461
1462 if (o < n) {
1463 /* ignore cloning unless only a single crtc */
1464 if (fb_helper->crtc_count > 1)
1465 continue;
1466
1467 if (!drm_mode_equal(modes[o], modes[n]))
1468 continue;
1469 }
1470
1471 crtcs[n] = crtc;
1472 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1473 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1474 width, height);
1475 if (score > best_score) {
1476 best_score = score;
1477 memcpy(best_crtcs, crtcs,
1478 dev->mode_config.num_connector *
1479 sizeof(struct drm_fb_helper_crtc *));
1480 }
1481 }
1482 out:
1483 kfree(crtcs);
1484 return best_score;
1485 }
1486
drm_setup_crtcs(struct drm_fb_helper * fb_helper)1487 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1488 {
1489 struct drm_device *dev = fb_helper->dev;
1490 struct drm_fb_helper_crtc **crtcs;
1491 struct drm_display_mode **modes;
1492 struct drm_mode_set *modeset;
1493 bool *enabled;
1494 int width, height;
1495 int i;
1496
1497 DRM_DEBUG_KMS("\n");
1498
1499 width = dev->mode_config.max_width;
1500 height = dev->mode_config.max_height;
1501
1502 crtcs = kcalloc(dev->mode_config.num_connector,
1503 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1504 modes = kcalloc(dev->mode_config.num_connector,
1505 sizeof(struct drm_display_mode *), GFP_KERNEL);
1506 enabled = kcalloc(dev->mode_config.num_connector,
1507 sizeof(bool), GFP_KERNEL);
1508 if (!crtcs || !modes || !enabled) {
1509 DRM_ERROR("Memory allocation failed\n");
1510 goto out;
1511 }
1512
1513
1514 drm_enable_connectors(fb_helper, enabled);
1515
1516 if (!(fb_helper->funcs->initial_config &&
1517 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1518 enabled, width, height))) {
1519 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1520 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1521
1522 if (!drm_target_cloned(fb_helper,
1523 modes, enabled, width, height) &&
1524 !drm_target_preferred(fb_helper,
1525 modes, enabled, width, height))
1526 DRM_ERROR("Unable to find initial modes\n");
1527
1528 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1529 width, height);
1530
1531 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1532 }
1533
1534 /* need to set the modesets up here for use later */
1535 /* fill out the connector<->crtc mappings into the modesets */
1536 for (i = 0; i < fb_helper->crtc_count; i++) {
1537 modeset = &fb_helper->crtc_info[i].mode_set;
1538 modeset->num_connectors = 0;
1539 modeset->fb = NULL;
1540 }
1541
1542 for (i = 0; i < fb_helper->connector_count; i++) {
1543 struct drm_display_mode *mode = modes[i];
1544 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1545 modeset = &fb_crtc->mode_set;
1546
1547 if (mode && fb_crtc) {
1548 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1549 mode->name, fb_crtc->mode_set.crtc->base.id);
1550 fb_crtc->desired_mode = mode;
1551 if (modeset->mode)
1552 drm_mode_destroy(dev, modeset->mode);
1553 modeset->mode = drm_mode_duplicate(dev,
1554 fb_crtc->desired_mode);
1555 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1556 modeset->fb = fb_helper->fb;
1557 }
1558 }
1559
1560 /* Clear out any old modes if there are no more connected outputs. */
1561 for (i = 0; i < fb_helper->crtc_count; i++) {
1562 modeset = &fb_helper->crtc_info[i].mode_set;
1563 if (modeset->num_connectors == 0) {
1564 BUG_ON(modeset->fb);
1565 BUG_ON(modeset->num_connectors);
1566 if (modeset->mode)
1567 drm_mode_destroy(dev, modeset->mode);
1568 modeset->mode = NULL;
1569 fb_helper->crtc_info[i].desired_mode = NULL;
1570 }
1571 }
1572 out:
1573 kfree(crtcs);
1574 kfree(modes);
1575 kfree(enabled);
1576 }
1577
1578 /**
1579 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1580 * @fb_helper: fb_helper device struct
1581 * @bpp_sel: bpp value to use for the framebuffer configuration
1582 *
1583 * Scans the CRTCs and connectors and tries to put together an initial setup.
1584 * At the moment, this is a cloned configuration across all heads with
1585 * a new framebuffer object as the backing store.
1586 *
1587 * Note that this also registers the fbdev and so allows userspace to call into
1588 * the driver through the fbdev interfaces.
1589 *
1590 * This function will call down into the ->fb_probe callback to let
1591 * the driver allocate and initialize the fbdev info structure and the drm
1592 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1593 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1594 * values for the fbdev info structure.
1595 *
1596 * RETURNS:
1597 * Zero if everything went ok, nonzero otherwise.
1598 */
drm_fb_helper_initial_config(struct drm_fb_helper * fb_helper,int bpp_sel)1599 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1600 {
1601 struct drm_device *dev = fb_helper->dev;
1602 int count = 0;
1603
1604 drm_fb_helper_parse_command_line(fb_helper);
1605
1606 mutex_lock(&dev->mode_config.mutex);
1607 count = drm_fb_helper_probe_connector_modes(fb_helper,
1608 dev->mode_config.max_width,
1609 dev->mode_config.max_height);
1610 mutex_unlock(&dev->mode_config.mutex);
1611 /*
1612 * we shouldn't end up with no modes here.
1613 */
1614 if (count == 0)
1615 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1616
1617 drm_setup_crtcs(fb_helper);
1618
1619 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1620 }
1621 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1622
1623 /**
1624 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1625 * probing all the outputs attached to the fb
1626 * @fb_helper: the drm_fb_helper
1627 *
1628 * Scan the connectors attached to the fb_helper and try to put together a
1629 * setup after *notification of a change in output configuration.
1630 *
1631 * Called at runtime, takes the mode config locks to be able to check/change the
1632 * modeset configuration. Must be run from process context (which usually means
1633 * either the output polling work or a work item launched from the driver's
1634 * hotplug interrupt).
1635 *
1636 * Note that the driver must ensure that this is only called _after_ the fb has
1637 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1638 *
1639 * RETURNS:
1640 * 0 on success and a non-zero error code otherwise.
1641 */
drm_fb_helper_hotplug_event(struct drm_fb_helper * fb_helper)1642 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1643 {
1644 struct drm_device *dev = fb_helper->dev;
1645 u32 max_width, max_height;
1646
1647 if (!fb_helper->fb)
1648 return 0;
1649
1650 mutex_lock(&fb_helper->dev->mode_config.mutex);
1651 if (!drm_fb_helper_is_bound(fb_helper)) {
1652 fb_helper->delayed_hotplug = true;
1653 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1654 return 0;
1655 }
1656 DRM_DEBUG_KMS("\n");
1657
1658 max_width = fb_helper->fb->width;
1659 max_height = fb_helper->fb->height;
1660
1661 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1662 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1663
1664 drm_modeset_lock_all(dev);
1665 drm_setup_crtcs(fb_helper);
1666 drm_modeset_unlock_all(dev);
1667 #ifdef __NetBSD__
1668 drm_fb_helper_set_config(fb_helper);
1669 #else
1670 drm_fb_helper_set_par(fb_helper->fbdev);
1671 #endif
1672
1673 return 0;
1674 }
1675 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1676
1677 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1678 * but the module doesn't depend on any fb console symbols. At least
1679 * attempt to load fbcon to avoid leaving the system without a usable console.
1680 */
1681 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
drm_fb_helper_modinit(void)1682 static int __init drm_fb_helper_modinit(void)
1683 {
1684 const char *name = "fbcon";
1685 struct module *fbcon;
1686
1687 mutex_lock(&module_mutex);
1688 fbcon = find_module(name);
1689 mutex_unlock(&module_mutex);
1690
1691 if (!fbcon)
1692 request_module_nowait(name);
1693 return 0;
1694 }
1695
1696 module_init(drm_fb_helper_modinit);
1697 #endif
1698