1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /*
6 * Copyright (c) 2006-2009 Red Hat Inc.
7 * Copyright (c) 2006-2008, 2013, Intel Corporation
8 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
9 *
10 * DRM framebuffer helper functions
11 *
12 * Permission to use, copy, modify, distribute, and sell this software and its
13 * documentation for any purpose is hereby granted without fee, provided that
14 * the above copyright notice appear in all copies and that both that copyright
15 * notice and this permission notice appear in supporting documentation, and
16 * that the name of the copyright holders not be used in advertising or
17 * publicity pertaining to distribution of the software without specific,
18 * written prior permission. The copyright holders make no representations
19 * about the suitability of this software for any purpose. It is provided "as
20 * is" without express or implied warranty.
21 *
22 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
23 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
24 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
25 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
26 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
27 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
28 * OF THIS SOFTWARE.
29 *
30 * Authors:
31 * Dave Airlie <airlied@linux.ie>
32 * Jesse Barnes <jesse.barnes@intel.com>
33 */
34 #include "drmP.h"
35 #include "drm_crtc.h"
36 #include "drm_fb_helper.h"
37 #include "drm_crtc_helper.h"
38
39
40 struct list_head kernel_fb_helper_list;
41 /**
42 * DOC: fbdev helpers
43 *
44 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
45 * mode setting driver. They can be used mostly independantely from the crtc
46 * helper functions used by many drivers to implement the kernel mode setting
47 * interfaces.
48 *
49 * Initialization is done as a three-step process with drm_fb_helper_init(),
50 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
51 * Drivers with fancier requirements than the default beheviour can override the
52 * second step with their own code. Teardown is done with drm_fb_helper_fini().
53 *
54 * At runtime drivers should restore the fbdev console by calling
55 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
56 * should also notify the fb helper code from updates to the output
57 * configuration by calling drm_fb_helper_hotplug_event(). For easier
58 * integration with the output polling code in drm_crtc_helper.c the modeset
59 * code proves a ->output_poll_changed callback.
60 *
61 * All other functions exported by the fb helper library can be used to
62 * implement the fbdev driver interface by the driver.
63 */
64
65 /* simple single crtc case helper function
66 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
67 * emulation helper
68 * @fb_helper: fbdev initialized with drm_fb_helper_init
69 *
70 * This functions adds all the available connectors for use with the given
71 * fb_helper. This is a separate step to allow drivers to freely assign
72 * connectors to the fbdev, e.g. if some are reserved for special purposes or
73 * not adequate to be used for the fbcon.
74 *
75 * Since this is part of the initial setup before the fbdev is published, no
76 * locking is required.
77 */
drm_fb_helper_single_add_all_connectors(struct drm_fb_helper * fb_helper)78 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
79 {
80 struct drm_device *dev = fb_helper->dev;
81 struct drm_connector *connector;
82 int i;
83
84 list_for_each_entry(connector, struct drm_connector, &dev->mode_config.connector_list, head) {
85 struct drm_fb_helper_connector *fb_helper_connector;
86
87 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
88 if (!fb_helper_connector)
89 goto fail;
90
91 fb_helper_connector->connector = connector;
92 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
93 }
94 return 0;
95 fail:
96 for (i = 0; i < fb_helper->connector_count; i++) {
97 kfree(fb_helper->connector_info[i], sizeof(struct drm_fb_helper_connector));
98 fb_helper->connector_info[i] = NULL;
99 }
100 fb_helper->connector_count = 0;
101 return -ENOMEM;
102 }
103
drm_fb_helper_parse_command_line(struct drm_fb_helper * fb_helper)104 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
105 {
106 struct drm_device *dev = fb_helper->dev;
107 struct drm_fb_helper_connector *fb_helper_conn;
108 struct gfxp_bm_fb_info fb_info;
109 int i;
110
111 gfxp_bm_getfb_info(dev->vgatext->private, &fb_info);
112 for (i = 0; i < fb_helper->connector_count; i++) {
113
114 fb_helper_conn = fb_helper->connector_info[i];
115
116 struct drm_cmdline_mode *cmdline_mode;
117 cmdline_mode = &fb_helper_conn->cmdline_mode;
118 cmdline_mode->specified = true;
119 cmdline_mode->xres = fb_info.xres;
120 cmdline_mode->yres = fb_info.yres;
121 cmdline_mode->refresh_specified = true;
122 cmdline_mode->refresh = 60;
123 cmdline_mode->bpp_specified = true;
124 cmdline_mode->bpp = fb_info.depth;
125 }
126 return 0;
127 }
128
drm_fb_helper_save_lut_atomic(struct drm_crtc * crtc,struct drm_fb_helper * helper)129 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
130 {
131 uint16_t *r_base, *g_base, *b_base;
132 int i;
133
134 if (helper->funcs->gamma_get == NULL)
135 return;
136
137 r_base = crtc->gamma_store;
138 g_base = r_base + crtc->gamma_size;
139 b_base = g_base + crtc->gamma_size;
140
141 for (i = 0; i < crtc->gamma_size; i++)
142 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
143 }
144
drm_fb_helper_restore_lut_atomic(struct drm_crtc * crtc)145 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
146 {
147 uint16_t *r_base, *g_base, *b_base;
148
149 if (crtc->funcs->gamma_set == NULL)
150 return;
151
152 r_base = crtc->gamma_store;
153 g_base = r_base + crtc->gamma_size;
154 b_base = g_base + crtc->gamma_size;
155
156 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
157 }
158
159 /* Find the real fb for a given fb helper CRTC */
drm_mode_config_fb(struct drm_crtc * crtc)160 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
161 {
162 struct drm_device *dev = crtc->dev;
163 struct drm_crtc *c;
164
165 list_for_each_entry(c, struct drm_crtc, &dev->mode_config.crtc_list, head) {
166 if (crtc->base.id == c->base.id)
167 return c->fb;
168 }
169
170 return NULL;
171 }
172
drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper * fb_helper)173 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
174 {
175 struct drm_device *dev;
176 struct drm_plane *plane;
177 bool error = false;
178 int i;
179
180 if (fb_helper == NULL)
181 return error;
182
183 dev = fb_helper->dev;
184
185 list_for_each_entry(plane, struct drm_plane, &dev->mode_config.plane_list, head)
186 drm_plane_force_disable(plane);
187
188 for (i = 0; i < fb_helper->crtc_count; i++) {
189 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
190 struct drm_crtc *crtc = mode_set->crtc;
191 int ret;
192
193 if (crtc->funcs->cursor_set) {
194 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
195 if (ret)
196 error = true;
197 }
198
199 ret = drm_mode_set_config_internal(mode_set);
200 if (ret)
201 error = true;
202 }
203 return error;
204 }
205
drm_fb_helper_force_kernel_mode(void)206 bool drm_fb_helper_force_kernel_mode(void)
207 {
208 bool ret, error = false;
209 struct drm_fb_helper *helper;
210
211 if (list_empty(&kernel_fb_helper_list))
212 return false;
213
214 list_for_each_entry(helper, struct drm_fb_helper, &kernel_fb_helper_list, kernel_fb_list) {
215 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
216 continue;
217
218 ret = drm_fb_helper_restore_fbdev_mode(helper);
219 if (ret)
220 error = true;
221 }
222 return error;
223 }
224
drm_fb_helper_is_bound(struct drm_fb_helper * fb_helper)225 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
226 {
227 struct drm_device *dev = fb_helper->dev;
228 struct drm_crtc *crtc;
229 int bound = 0, crtcs_bound = 0;
230
231 list_for_each_entry(crtc, struct drm_crtc, &dev->mode_config.crtc_list, head) {
232 if (crtc->fb)
233 crtcs_bound++;
234 if (crtc->fb == fb_helper->fb)
235 bound++;
236 }
237
238 if (bound < crtcs_bound)
239 return false;
240 return true;
241 }
242
243 /* maximum connectors per crtcs in the mode set */
244 #define INTELFB_CONN_LIMIT 4
245
drm_fb_helper_crtc_free(struct drm_fb_helper * helper)246 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
247 {
248 int i;
249 struct drm_device *dev = helper->dev;
250
251 kfree(helper->connector_info, dev->mode_config.num_connector * sizeof(struct drm_fb_helper_connector *));
252 for (i = 0; i < helper->crtc_count; i++) {
253 kfree(helper->crtc_info[i].mode_set.connectors, INTELFB_CONN_LIMIT * sizeof(struct drm_connector *));
254 if (helper->crtc_info[i].mode_set.mode)
255 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
256 }
257 kfree(helper->crtc_info, helper->crtc_count * sizeof(struct drm_fb_helper_crtc));
258 }
259
drm_fb_helper_init(struct drm_device * dev,struct drm_fb_helper * fb_helper,int crtc_count,int max_conn_count)260 int drm_fb_helper_init(struct drm_device *dev,
261 struct drm_fb_helper *fb_helper,
262 int crtc_count, int max_conn_count)
263 {
264 struct drm_crtc *crtc;
265 int i;
266
267 fb_helper->dev = dev;
268
269 INIT_LIST_HEAD(&kernel_fb_helper_list);
270 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
271
272 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
273 if (!fb_helper->crtc_info)
274 return -ENOMEM;
275
276 fb_helper->crtc_count = crtc_count;
277 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
278 if (!fb_helper->connector_info) {
279 kfree(fb_helper->crtc_info, sizeof(struct drm_fb_helper_crtc));
280 return -ENOMEM;
281 }
282 fb_helper->connector_count = 0;
283
284 for (i = 0; i < crtc_count; i++) {
285 fb_helper->crtc_info[i].mode_set.connectors =
286 kcalloc(max_conn_count,
287 sizeof(struct drm_connector *),
288 GFP_KERNEL);
289
290 if (!fb_helper->crtc_info[i].mode_set.connectors)
291 goto out_free;
292 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
293 }
294
295 i = 0;
296 list_for_each_entry(crtc, struct drm_crtc, &dev->mode_config.crtc_list, head) {
297 fb_helper->crtc_info[i].mode_set.crtc = crtc;
298 i++;
299 }
300
301 return 0;
302 out_free:
303 drm_fb_helper_crtc_free(fb_helper);
304 return -ENOMEM;
305 }
306
drm_fb_helper_fini(struct drm_fb_helper * fb_helper)307 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
308 {
309 if (!list_empty(&fb_helper->kernel_fb_list)) {
310 list_del(&fb_helper->kernel_fb_list);
311 if (list_empty(&kernel_fb_helper_list)) {
312 DRM_INFO("drm: unregistered panic notifier");
313 }
314 }
315
316 drm_fb_helper_crtc_free(fb_helper);
317
318 }
319
drm_fb_helper_single_fb_probe(struct drm_fb_helper * fb_helper,int preferred_bpp)320 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
321 int preferred_bpp)
322 {
323 int ret = 0;
324 int crtc_count = 0;
325 int i;
326 struct drm_fb_helper_surface_size sizes;
327 int gamma_size = 0;
328
329 (void) memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
330 sizes.surface_depth = 24;
331 sizes.surface_bpp = 32;
332 sizes.fb_width = (unsigned)-1;
333 sizes.fb_height = (unsigned)-1;
334
335 /* if driver picks 8 or 16 by default use that
336 for both depth/bpp */
337 if (preferred_bpp != sizes.surface_bpp)
338 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
339
340 /* first up get a count of crtcs now in use and new min/maxes width/heights */
341 for (i = 0; i < fb_helper->connector_count; i++) {
342 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
343 struct drm_cmdline_mode *cmdline_mode;
344
345 cmdline_mode = &fb_helper_conn->cmdline_mode;
346
347 if (cmdline_mode->bpp_specified) {
348 switch (cmdline_mode->bpp) {
349 case 8:
350 sizes.surface_depth = sizes.surface_bpp = 8;
351 break;
352 case 15:
353 sizes.surface_depth = 15;
354 sizes.surface_bpp = 16;
355 break;
356 case 16:
357 sizes.surface_depth = sizes.surface_bpp = 16;
358 break;
359 case 24:
360 sizes.surface_depth = sizes.surface_bpp = 24;
361 break;
362 case 32:
363 sizes.surface_depth = 24;
364 sizes.surface_bpp = 32;
365 break;
366 }
367 break;
368 }
369 }
370
371 crtc_count = 0;
372 for (i = 0; i < fb_helper->crtc_count; i++) {
373 struct drm_display_mode *desired_mode;
374 desired_mode = fb_helper->crtc_info[i].desired_mode;
375
376 if (desired_mode) {
377 if (gamma_size == 0)
378 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
379 if (desired_mode->hdisplay < sizes.fb_width)
380 sizes.fb_width = desired_mode->hdisplay;
381 if (desired_mode->vdisplay < sizes.fb_height)
382 sizes.fb_height = desired_mode->vdisplay;
383 if (desired_mode->hdisplay > sizes.surface_width)
384 sizes.surface_width = desired_mode->hdisplay;
385 if (desired_mode->vdisplay > sizes.surface_height)
386 sizes.surface_height = desired_mode->vdisplay;
387 crtc_count++;
388 }
389 }
390
391 if (crtc_count == 0 || sizes.fb_width == (unsigned)-1 || sizes.fb_height == (unsigned)-1) {
392 /* hmm everyone went away - assume VGA cable just fell out
393 and will come back later. */
394 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
395 sizes.fb_width = sizes.surface_width = 1024;
396 sizes.fb_height = sizes.surface_height = 768;
397 }
398
399 /* push down into drivers */
400 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
401 if (ret < 0)
402 return ret;
403
404 /*
405 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
406 * events, but at init time drm_setup_crtcs needs to be called before
407 * the fb is allocated (since we need to figure out the desired size of
408 * the fb before we can allocate it ...). Hence we need to fix things up
409 * here again.
410 */
411 for (i = 0; i < fb_helper->crtc_count; i++)
412 if (fb_helper->crtc_info[i].mode_set.num_connectors)
413 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
414
415
416 /* Switch back to kernel console on panic */
417 /* multi card linked list maybe */
418 if (list_empty(&kernel_fb_helper_list)) {
419 DRM_INFO("registered panic notifier");
420 }
421
422 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list, (caddr_t)fb_helper);
423
424 return 0;
425 }
426
drm_fb_helper_probe_connector_modes(struct drm_fb_helper * fb_helper,uint32_t maxX,uint32_t maxY)427 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
428 uint32_t maxX,
429 uint32_t maxY)
430 {
431 struct drm_connector *connector;
432 int count = 0;
433 int i;
434
435 for (i = 0; i < fb_helper->connector_count; i++) {
436 connector = fb_helper->connector_info[i]->connector;
437 count += connector->funcs->fill_modes(connector, maxX, maxY);
438 }
439
440 return count;
441 }
442
drm_has_preferred_mode(struct drm_fb_helper_connector * fb_connector,int width,int height)443 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
444 {
445 struct drm_display_mode *mode;
446
447 list_for_each_entry(mode, struct drm_display_mode, &fb_connector->connector->modes, head) {
448 if (drm_mode_width(mode) > width ||
449 drm_mode_height(mode) > height)
450 continue;
451 if (mode->type & DRM_MODE_TYPE_PREFERRED)
452 return mode;
453 }
454 return NULL;
455 }
456
drm_has_cmdline_mode(struct drm_fb_helper_connector * fb_connector)457 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
458 {
459 struct drm_cmdline_mode *cmdline_mode;
460 cmdline_mode = &fb_connector->cmdline_mode;
461 return cmdline_mode->specified;
462 }
463
drm_pick_cmdline_mode(struct drm_fb_helper_connector * fb_helper_conn,int width,int height)464 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
465 /* LINTED E_FUNC_ARG_UNUSED */
466 int width, int height)
467 {
468 struct drm_cmdline_mode *cmdline_mode;
469 struct drm_display_mode *mode = NULL;
470
471 cmdline_mode = &fb_helper_conn->cmdline_mode;
472 if (cmdline_mode->specified == false)
473 return mode;
474
475 /* attempt to find a matching mode in the list of modes
476 * we have gotten so far, if not add a CVT mode that conforms
477 */
478 if (cmdline_mode->rb || cmdline_mode->margins)
479 goto create_mode;
480
481 list_for_each_entry(mode, struct drm_display_mode, &fb_helper_conn->connector->modes, head) {
482 /* check width/height */
483 if (mode->hdisplay != cmdline_mode->xres ||
484 mode->vdisplay != cmdline_mode->yres)
485 continue;
486
487 if (cmdline_mode->refresh_specified) {
488 if (mode->vrefresh != cmdline_mode->refresh)
489 continue;
490 }
491
492 if (cmdline_mode->interlace) {
493 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
494 continue;
495 }
496 return mode;
497 }
498
499 create_mode:
500 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
501 cmdline_mode);
502 if (mode)
503 list_add(&mode->head, &fb_helper_conn->connector->modes,
504 (caddr_t)mode);
505 return mode;
506 }
507
drm_connector_enabled(struct drm_connector * connector,bool strict)508 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
509 {
510 bool enable;
511
512 if (strict)
513 enable = connector->status == connector_status_connected;
514 else
515 enable = connector->status != connector_status_disconnected;
516
517 return enable;
518 }
519
drm_enable_connectors(struct drm_fb_helper * fb_helper,bool * enabled)520 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
521 bool *enabled)
522 {
523 bool any_enabled = false;
524 struct drm_connector *connector;
525 int i = 0;
526
527 for (i = 0; i < fb_helper->connector_count; i++) {
528 connector = fb_helper->connector_info[i]->connector;
529 enabled[i] = drm_connector_enabled(connector, true);
530 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
531 enabled[i] ? "yes" : "no");
532 any_enabled |= enabled[i];
533 }
534
535 if (any_enabled)
536 return;
537
538 for (i = 0; i < fb_helper->connector_count; i++) {
539 connector = fb_helper->connector_info[i]->connector;
540 enabled[i] = drm_connector_enabled(connector, false);
541 }
542 }
543
drm_target_cloned(struct drm_fb_helper * fb_helper,struct drm_display_mode ** modes,bool * enabled,int width,int height)544 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
545 struct drm_display_mode **modes,
546 bool *enabled, int width, int height)
547 {
548 int count, i, j;
549 bool can_clone = false;
550 struct drm_fb_helper_connector *fb_helper_conn;
551 struct drm_display_mode *dmt_mode, *mode;
552
553 /* only contemplate cloning in the single crtc case */
554 if (fb_helper->crtc_count > 1)
555 return false;
556
557 count = 0;
558 for (i = 0; i < fb_helper->connector_count; i++) {
559 if (enabled[i])
560 count++;
561 }
562
563 /* only contemplate cloning if more than one connector is enabled */
564 if (count <= 1)
565 return false;
566
567 /* check the command line or if nothing common pick 1024x768 */
568 can_clone = true;
569 for (i = 0; i < fb_helper->connector_count; i++) {
570 if (!enabled[i])
571 continue;
572 fb_helper_conn = fb_helper->connector_info[i];
573 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
574 if (!modes[i]) {
575 can_clone = false;
576 break;
577 }
578 for (j = 0; j < i; j++) {
579 if (!enabled[j])
580 continue;
581 if (!drm_mode_equal(modes[j], modes[i]))
582 can_clone = false;
583 }
584 }
585
586 if (can_clone) {
587 DRM_DEBUG_KMS("can clone using command line\n");
588 return true;
589 }
590
591 /* try and find a 1024x768 mode on each connector */
592 can_clone = true;
593 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
594
595 for (i = 0; i < fb_helper->connector_count; i++) {
596
597 if (!enabled[i])
598 continue;
599
600 fb_helper_conn = fb_helper->connector_info[i];
601 list_for_each_entry(mode, struct drm_display_mode, &fb_helper_conn->connector->modes, head) {
602 if (drm_mode_equal(mode, dmt_mode))
603 modes[i] = mode;
604 }
605 if (!modes[i])
606 can_clone = false;
607 }
608
609 if (can_clone) {
610 DRM_DEBUG_KMS("can clone using 1024x768\n");
611 return true;
612 }
613 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
614 return false;
615 }
616
drm_target_preferred(struct drm_fb_helper * fb_helper,struct drm_display_mode ** modes,bool * enabled,int width,int height)617 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
618 struct drm_display_mode **modes,
619 bool *enabled, int width, int height)
620 {
621 struct drm_fb_helper_connector *fb_helper_conn;
622 int i;
623
624 for (i = 0; i < fb_helper->connector_count; i++) {
625 fb_helper_conn = fb_helper->connector_info[i];
626
627 if (enabled[i] == false)
628 continue;
629
630 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
631 fb_helper_conn->connector->base.id);
632
633 /* got for command line mode first */
634 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
635 if (!modes[i]) {
636 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
637 fb_helper_conn->connector->base.id);
638 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
639 }
640 /* No preferred modes, pick one off the list */
641 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
642 list_for_each_entry(modes[i], struct drm_display_mode, &fb_helper_conn->connector->modes, head)
643 /* LINTED */
644 { if (1) break; }
645 }
646 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
647 "none");
648 }
649 return true;
650 }
651
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)652 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
653 struct drm_fb_helper_crtc **best_crtcs,
654 struct drm_display_mode **modes,
655 int n, int width, int height)
656 {
657 int c, o;
658 struct drm_device *dev = fb_helper->dev;
659 struct drm_connector *connector;
660 struct drm_connector_helper_funcs *connector_funcs;
661 struct drm_encoder *encoder;
662 int my_score, best_score, score;
663 struct drm_fb_helper_crtc **crtcs, *crtc;
664 struct drm_fb_helper_connector *fb_helper_conn;
665 int num_connector = dev->mode_config.num_connector;
666
667 if (n == fb_helper->connector_count)
668 return 0;
669
670 ASSERT(n <= num_connector);
671
672 fb_helper_conn = fb_helper->connector_info[n];
673 connector = fb_helper_conn->connector;
674
675 best_crtcs[n] = NULL;
676 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
677 if (modes[n] == NULL)
678 return best_score;
679
680 crtcs = kzalloc(num_connector * sizeof(struct drm_fb_helper_crtc *),
681 GFP_KERNEL);
682 if (!crtcs)
683 return best_score;
684
685 my_score = 1;
686 if (connector->status == connector_status_connected)
687 my_score++;
688 if (drm_has_cmdline_mode(fb_helper_conn))
689 my_score++;
690 if (drm_has_preferred_mode(fb_helper_conn, width, height))
691 my_score++;
692
693 connector_funcs = connector->helper_private;
694 encoder = connector_funcs->best_encoder(connector);
695 if (!encoder)
696 goto out;
697
698 /* select a crtc for this connector and then attempt to configure
699 remaining connectors */
700 for (c = 0; c < fb_helper->crtc_count; c++) {
701 crtc = &fb_helper->crtc_info[c];
702
703 if ((encoder->possible_crtcs & (1 << c)) == 0)
704 continue;
705
706 for (o = 0; o < n; o++)
707 if (best_crtcs[o] == crtc)
708 break;
709
710 if (o < n) {
711 /* ignore cloning unless only a single crtc */
712 if (fb_helper->crtc_count > 1)
713 continue;
714
715 if (!drm_mode_equal(modes[o], modes[n]))
716 continue;
717 }
718
719 crtcs[n] = crtc;
720 (void) memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
721 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
722 width, height);
723 if (score > best_score) {
724 best_score = score;
725 (void) memcpy(best_crtcs, crtcs,
726 num_connector *
727 sizeof(struct drm_fb_helper_crtc *));
728 }
729 }
730 out:
731 kfree(crtcs, (num_connector * sizeof(struct drm_fb_helper_crtc *)));
732 return best_score;
733 }
734
drm_setup_crtcs(struct drm_fb_helper * fb_helper)735 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
736 {
737 struct drm_device *dev = fb_helper->dev;
738 struct drm_fb_helper_crtc **crtcs;
739 struct drm_display_mode **modes;
740 struct drm_mode_set *modeset;
741 bool *enabled;
742 int width, height;
743 int i, num_connector = dev->mode_config.num_connector;
744
745 DRM_DEBUG_KMS("\n");
746
747 width = dev->mode_config.max_width;
748 height = dev->mode_config.max_height;
749
750 if ((crtcs = kcalloc(num_connector,
751 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL)) == NULL) {
752 DRM_ERROR("Memory allocation failed for crtcs\n");
753 return;
754 }
755 if ((modes = kcalloc(num_connector,
756 sizeof(struct drm_display_mode *), GFP_KERNEL)) == NULL) {
757 DRM_ERROR("Memory allocation failed for modes\n");
758 goto errout1;
759 }
760 if ((enabled = kcalloc(num_connector,
761 sizeof(bool), GFP_KERNEL)) == NULL) {
762 DRM_ERROR("Memory allocation failed for enabled\n");
763 goto errout2;
764 }
765
766
767 drm_enable_connectors(fb_helper, enabled);
768
769 if (!(fb_helper->funcs->initial_config &&
770 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
771 enabled, width, height))) {
772 (void) memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
773 (void) memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
774
775 if (!drm_target_cloned(fb_helper,
776 modes, enabled, width, height) &&
777 !drm_target_preferred(fb_helper,
778 modes, enabled, width, height))
779 DRM_ERROR("Unable to find initial modes\n");
780
781 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
782 width, height);
783
784 (void) drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
785 }
786
787 /* need to set the modesets up here for use later */
788 /* fill out the connector<->crtc mappings into the modesets */
789 for (i = 0; i < fb_helper->crtc_count; i++) {
790 modeset = &fb_helper->crtc_info[i].mode_set;
791 modeset->num_connectors = 0;
792 modeset->fb = NULL;
793 }
794
795 for (i = 0; i < fb_helper->connector_count; i++) {
796 struct drm_display_mode *mode = modes[i];
797 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
798 modeset = &fb_crtc->mode_set;
799
800 if (mode && fb_crtc) {
801 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
802 mode->name, fb_crtc->mode_set.crtc->base.id);
803 fb_crtc->desired_mode = mode;
804 if (modeset->mode)
805 drm_mode_destroy(dev, modeset->mode);
806 modeset->mode = drm_mode_duplicate(dev,
807 fb_crtc->desired_mode);
808 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
809 modeset->fb = fb_helper->fb;
810 }
811 }
812
813 /* Clear out any old modes if there are no more connected outputs. */
814 for (i = 0; i < fb_helper->crtc_count; i++) {
815 modeset = &fb_helper->crtc_info[i].mode_set;
816 if (modeset->num_connectors == 0) {
817 BUG_ON(modeset->fb);
818 BUG_ON(modeset->num_connectors);
819 if (modeset->mode)
820 drm_mode_destroy(dev, modeset->mode);
821 modeset->mode = NULL;
822 }
823 }
824
825 kfree(enabled, num_connector * sizeof(bool));
826 errout2:
827 kfree(modes, num_connector * sizeof(struct drm_display_mode *));
828 errout1:
829 kfree(crtcs, num_connector * sizeof(struct drm_fb_helper_crtc *));
830 }
831
832 /**
833 * drm_helper_initial_config - setup a sane initial connector configuration
834 * @dev: DRM device
835 *
836 *
837 * Scan the CRTCs and connectors and try to put together an initial setup.
838 * At the moment, this is a cloned configuration across all heads with
839 * a new framebuffer object as the backing store.
840 *
841 * Note that this also registers the fbdev and so allows userspace to call into
842 * the driver through the fbdev interfaces.
843 *
844 * This function will call down into the ->fb_probe callback to let
845 * the driver allocate and initialize the fbdev info structure and the drm
846 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
847 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
848 * values for the fbdev info structure.
849 *
850 * RETURNS:
851 * Zero if everything went ok, nonzero otherwise.
852 */
drm_fb_helper_initial_config(struct drm_fb_helper * fb_helper,int bpp_sel)853 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
854 {
855 struct drm_device *dev = fb_helper->dev;
856 int count = 0;
857
858 (void) drm_fb_helper_parse_command_line(fb_helper);
859
860 count = drm_fb_helper_probe_connector_modes(fb_helper,
861 dev->mode_config.max_width,
862 dev->mode_config.max_height);
863 /*
864 * we shouldn't end up with no modes here.
865 */
866 if (count == 0) {
867 DRM_INFO("No connectors reported connected with modes");
868 }
869 drm_setup_crtcs(fb_helper);
870
871 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
872 }
873
874
875 /**
876 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
877 * probing all the outputs attached to the fb.
878 * @fb_helper: the drm_fb_helper
879 *
880 * Scan the connectors attached to the fb_helper and try to put together a
881 * setup after *notification of a change in output configuration.
882 *
883 * Called at runtime, takes the mode config locks to be able to check/change the
884 * modeset configuration. Must be run from process context (which usually means
885 * either the output polling work or a work item launched from the driver's
886 * hotplug interrupt).
887 *
888 * Scan the connectors attached to the fb_helper and try to put together a
889 * setup after *notification of a change in output configuration.
890 *
891 * RETURNS:
892 * 0 on success and a non-zero error code otherwise.
893 */
drm_fb_helper_hotplug_event(struct drm_fb_helper * fb_helper)894 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
895 {
896 struct drm_device *dev = fb_helper->dev;
897 u32 max_width, max_height, bpp_sel;
898
899 if (!fb_helper->fb)
900 return 0;
901
902 mutex_lock(&fb_helper->dev->mode_config.mutex);
903 if (!drm_fb_helper_is_bound(fb_helper)) {
904 fb_helper->delayed_hotplug = true;
905 mutex_unlock(&fb_helper->dev->mode_config.mutex);
906 return 0;
907 }
908 DRM_DEBUG_KMS("\n");
909
910 max_width = fb_helper->fb->width;
911 max_height = fb_helper->fb->height;
912 bpp_sel = fb_helper->fb->bits_per_pixel;
913
914 (void) drm_fb_helper_probe_connector_modes(fb_helper, max_width,
915 max_height);
916 mutex_unlock(&fb_helper->dev->mode_config.mutex);
917
918 drm_modeset_lock_all(dev);
919 drm_setup_crtcs(fb_helper);
920 drm_modeset_unlock_all(dev);
921
922 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
923 }
924
drm_gfxp_setmode(int mode)925 int drm_gfxp_setmode(int mode)
926 {
927 bool ret = 0;
928 if (mode == 0) {
929 ret = drm_fb_helper_force_kernel_mode();
930 if (ret == true)
931 DRM_ERROR("Failed to restore crtc configuration\n");
932 }
933 if (mode == 1)
934 DRM_DEBUG_KMS("do nothing in entervt");
935 return ret;
936 }
937
938 struct gfxp_blt_ops drm_gfxp_ops = {
939 NULL, /* blt */
940 NULL, /* copy */
941 NULL, /* clear */
942 drm_gfxp_setmode, /* setmode */
943 };
944
drm_register_fbops(struct drm_device * dev)945 void drm_register_fbops(struct drm_device *dev)
946 {
947 gfxp_bm_register_fbops(dev->vgatext->private, &drm_gfxp_ops);
948 }
949
drm_getfb_size(struct drm_device * dev)950 int drm_getfb_size(struct drm_device *dev)
951 {
952 struct gfxp_bm_fb_info fb_info;
953 int size, pitch;
954 gfxp_bm_getfb_info(dev->vgatext->private, &fb_info);
955 pitch = ALIGN(fb_info.xres * ((fb_info.depth + 7) / 8), 64);
956 size = ALIGN(pitch *fb_info.yres, PAGE_SIZE);
957 return size;
958 }
959