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