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 #ifndef DRM_FB_HELPER_H
31 #define DRM_FB_HELPER_H
32 
33 struct drm_fb_helper;
34 
35 #include <drm/drm_client.h>
36 #include <drm/drm_crtc.h>
37 #include <drm/drm_device.h>
38 #include <linux/kgdb.h>
39 
40 enum mode_set_atomic {
41 	LEAVE_ATOMIC_MODE_SET,
42 	ENTER_ATOMIC_MODE_SET,
43 };
44 
45 struct drm_fb_offset {
46 	int x, y;
47 };
48 
49 struct drm_fb_helper_crtc {
50 	struct drm_mode_set mode_set;
51 	struct drm_display_mode *desired_mode;
52 	int x, y;
53 	int rotation;
54 };
55 
56 /**
57  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
58  * @fb_width: fbdev width
59  * @fb_height: fbdev height
60  * @surface_width: scanout buffer width
61  * @surface_height: scanout buffer height
62  * @surface_bpp: scanout buffer bpp
63  * @surface_depth: scanout buffer depth
64  *
65  * Note that the scanout surface width/height may be larger than the fbdev
66  * width/height.  In case of multiple displays, the scanout surface is sized
67  * according to the largest width/height (so it is large enough for all CRTCs
68  * to scanout).  But the fbdev width/height is sized to the minimum width/
69  * height of all the displays.  This ensures that fbcon fits on the smallest
70  * of the attached displays.
71  *
72  * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
73  * rather than the surface size.
74  */
75 struct drm_fb_helper_surface_size {
76 	u32 fb_width;
77 	u32 fb_height;
78 	u32 surface_width;
79 	u32 surface_height;
80 	u32 surface_bpp;
81 	u32 surface_depth;
82 };
83 
84 /**
85  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
86  *
87  * Driver callbacks used by the fbdev emulation helper library.
88  */
89 struct drm_fb_helper_funcs {
90 	/**
91 	 * @fb_probe:
92 	 *
93 	 * Driver callback to allocate and initialize the fbdev info structure.
94 	 * Furthermore it also needs to allocate the DRM framebuffer used to
95 	 * back the fbdev.
96 	 *
97 	 * This callback is mandatory.
98 	 *
99 	 * RETURNS:
100 	 *
101 	 * The driver should return 0 on success and a negative error code on
102 	 * failure.
103 	 */
104 	int (*fb_probe)(struct drm_fb_helper *helper,
105 			struct drm_fb_helper_surface_size *sizes);
106 
107 	/**
108 	 * @initial_config:
109 	 *
110 	 * Driver callback to setup an initial fbdev display configuration.
111 	 * Drivers can use this callback to tell the fbdev emulation what the
112 	 * preferred initial configuration is. This is useful to implement
113 	 * smooth booting where the fbdev (and subsequently all userspace) never
114 	 * changes the mode, but always inherits the existing configuration.
115 	 *
116 	 * This callback is optional.
117 	 *
118 	 * RETURNS:
119 	 *
120 	 * The driver should return true if a suitable initial configuration has
121 	 * been filled out and false when the fbdev helper should fall back to
122 	 * the default probing logic.
123 	 */
124 	bool (*initial_config)(struct drm_fb_helper *fb_helper,
125 			       struct drm_fb_helper_crtc **crtcs,
126 			       struct drm_display_mode **modes,
127 			       struct drm_fb_offset *offsets,
128 			       bool *enabled, int width, int height);
129 };
130 
131 struct drm_fb_helper_connector {
132 	struct drm_connector *connector;
133 };
134 
135 /**
136  * struct drm_fb_helper - main structure to emulate fbdev on top of KMS
137  * @fb: Scanout framebuffer object
138  * @dev: DRM device
139  * @crtc_count: number of possible CRTCs
140  * @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
141  * @connector_count: number of connected connectors
142  * @connector_info_alloc_count: size of connector_info
143  * @funcs: driver callbacks for fb helper
144  * @fbdev: emulated fbdev device info struct
145  * @pseudo_palette: fake palette of 16 colors
146  * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to
147  *              the screen buffer
148  * @dirty_lock: spinlock protecting @dirty_clip
149  * @dirty_work: worker used to flush the framebuffer
150  * @resume_work: worker used during resume if the console lock is already taken
151  *
152  * This is the main structure used by the fbdev helpers. Drivers supporting
153  * fbdev emulation should embedded this into their overall driver structure.
154  * Drivers must also fill out a &struct drm_fb_helper_funcs with a few
155  * operations.
156  */
157 struct drm_fb_helper {
158 	/**
159 	 * @client:
160 	 *
161 	 * DRM client used by the generic fbdev emulation.
162 	 */
163 	struct drm_client_dev client;
164 
165 	/**
166 	 * @buffer:
167 	 *
168 	 * Framebuffer used by the generic fbdev emulation.
169 	 */
170 	struct drm_client_buffer *buffer;
171 
172 	struct drm_framebuffer *fb;
173 	struct drm_device *dev;
174 	int crtc_count;
175 	struct drm_fb_helper_crtc *crtc_info;
176 	int connector_count;
177 	int connector_info_alloc_count;
178 	/**
179 	 * @sw_rotations:
180 	 * Bitmask of all rotations requested for panel-orientation which
181 	 * could not be handled in hardware. If only one bit is set
182 	 * fbdev->fbcon_rotate_hint gets set to the requested rotation.
183 	 */
184 	int sw_rotations;
185 	/**
186 	 * @connector_info:
187 	 *
188 	 * Array of per-connector information. Do not iterate directly, but use
189 	 * drm_fb_helper_for_each_connector.
190 	 */
191 	struct drm_fb_helper_connector **connector_info;
192 	const struct drm_fb_helper_funcs *funcs;
193 	struct fb_info *fbdev;
194 	u32 pseudo_palette[17];
195 	struct drm_clip_rect dirty_clip;
196 	spinlock_t dirty_lock;
197 	struct work_struct dirty_work;
198 	struct work_struct resume_work;
199 
200 	/**
201 	 * @lock:
202 	 *
203 	 * Top-level FBDEV helper lock. This protects all internal data
204 	 * structures and lists, such as @connector_info and @crtc_info.
205 	 *
206 	 * FIXME: fbdev emulation locking is a mess and long term we want to
207 	 * protect all helper internal state with this lock as well as reduce
208 	 * core KMS locking as much as possible.
209 	 */
210 	struct mutex lock;
211 
212 	/**
213 	 * @kernel_fb_list:
214 	 *
215 	 * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
216 	 */
217 	struct list_head kernel_fb_list;
218 
219 	/**
220 	 * @delayed_hotplug:
221 	 *
222 	 * A hotplug was received while fbdev wasn't in control of the DRM
223 	 * device, i.e. another KMS master was active. The output configuration
224 	 * needs to be reprobe when fbdev is in control again.
225 	 */
226 	bool delayed_hotplug;
227 
228 	/**
229 	 * @deferred_setup:
230 	 *
231 	 * If no outputs are connected (disconnected or unknown) the FB helper
232 	 * code will defer setup until at least one of the outputs shows up.
233 	 * This field keeps track of the status so that setup can be retried
234 	 * at every hotplug event until it succeeds eventually.
235 	 *
236 	 * Protected by @lock.
237 	 */
238 	bool deferred_setup;
239 
240 	/**
241 	 * @preferred_bpp:
242 	 *
243 	 * Temporary storage for the driver's preferred BPP setting passed to
244 	 * FB helper initialization. This needs to be tracked so that deferred
245 	 * FB helper setup can pass this on.
246 	 *
247 	 * See also: @deferred_setup
248 	 */
249 	int preferred_bpp;
250 };
251 
252 static inline struct drm_fb_helper *
drm_fb_helper_from_client(struct drm_client_dev * client)253 drm_fb_helper_from_client(struct drm_client_dev *client)
254 {
255 	return container_of(client, struct drm_fb_helper, client);
256 }
257 
258 /**
259  * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers
260  *
261  * Helper define to register default implementations of drm_fb_helper
262  * functions. To be used in struct fb_ops of drm drivers.
263  */
264 #define DRM_FB_HELPER_DEFAULT_OPS \
265 	.fb_check_var	= drm_fb_helper_check_var, \
266 	.fb_set_par	= drm_fb_helper_set_par, \
267 	.fb_setcmap	= drm_fb_helper_setcmap, \
268 	.fb_blank	= drm_fb_helper_blank, \
269 	.fb_pan_display	= drm_fb_helper_pan_display, \
270 	.fb_debug_enter = drm_fb_helper_debug_enter, \
271 	.fb_debug_leave = drm_fb_helper_debug_leave, \
272 	.fb_ioctl	= drm_fb_helper_ioctl
273 
274 #ifdef CONFIG_DRM_FBDEV_EMULATION
275 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
276 			   const struct drm_fb_helper_funcs *funcs);
277 int drm_fb_helper_init(struct drm_device *dev,
278 		       struct drm_fb_helper *helper, int max_conn);
279 void drm_fb_helper_fini(struct drm_fb_helper *helper);
280 int drm_fb_helper_blank(int blank, struct fb_info *info);
281 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
282 			      struct fb_info *info);
283 int drm_fb_helper_set_par(struct fb_info *info);
284 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
285 			    struct fb_info *info);
286 
287 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
288 
289 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
290 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
291 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
292 			    uint32_t fb_width, uint32_t fb_height);
293 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
294 			    uint32_t depth);
295 
296 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
297 
298 void drm_fb_helper_deferred_io(struct fb_info *info,
299 			       struct list_head *pagelist);
300 int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper);
301 
302 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
303 			       size_t count, loff_t *ppos);
304 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
305 				size_t count, loff_t *ppos);
306 
307 void drm_fb_helper_sys_fillrect(struct fb_info *info,
308 				const struct fb_fillrect *rect);
309 void drm_fb_helper_sys_copyarea(struct fb_info *info,
310 				const struct fb_copyarea *area);
311 void drm_fb_helper_sys_imageblit(struct fb_info *info,
312 				 const struct fb_image *image);
313 
314 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
315 				const struct fb_fillrect *rect);
316 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
317 				const struct fb_copyarea *area);
318 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
319 				 const struct fb_image *image);
320 
321 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
322 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
323 					bool suspend);
324 
325 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
326 
327 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
328 			unsigned long arg);
329 
330 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
331 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
332 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
333 int drm_fb_helper_debug_enter(struct fb_info *info);
334 int drm_fb_helper_debug_leave(struct fb_info *info);
335 struct drm_display_mode *
336 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
337 			int width, int height);
338 struct drm_display_mode *
339 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn);
340 
341 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
342 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
343 				       struct drm_connector *connector);
344 
345 int drm_fb_helper_fbdev_setup(struct drm_device *dev,
346 			      struct drm_fb_helper *fb_helper,
347 			      const struct drm_fb_helper_funcs *funcs,
348 			      unsigned int preferred_bpp,
349 			      unsigned int max_conn_count);
350 void drm_fb_helper_fbdev_teardown(struct drm_device *dev);
351 
352 void drm_fb_helper_lastclose(struct drm_device *dev);
353 void drm_fb_helper_output_poll_changed(struct drm_device *dev);
354 
355 int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
356 				struct drm_fb_helper_surface_size *sizes);
357 int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp);
358 #else
drm_fb_helper_prepare(struct drm_device * dev,struct drm_fb_helper * helper,const struct drm_fb_helper_funcs * funcs)359 static inline void drm_fb_helper_prepare(struct drm_device *dev,
360 					struct drm_fb_helper *helper,
361 					const struct drm_fb_helper_funcs *funcs)
362 {
363 }
364 
drm_fb_helper_init(struct drm_device * dev,struct drm_fb_helper * helper,int max_conn)365 static inline int drm_fb_helper_init(struct drm_device *dev,
366 		       struct drm_fb_helper *helper,
367 		       int max_conn)
368 {
369 	/* So drivers can use it to free the struct */
370 	helper->dev = dev;
371 	dev->fb_helper = helper;
372 
373 	return 0;
374 }
375 
drm_fb_helper_fini(struct drm_fb_helper * helper)376 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
377 {
378 	if (helper && helper->dev)
379 		helper->dev->fb_helper = NULL;
380 }
381 
drm_fb_helper_blank(int blank,struct fb_info * info)382 static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
383 {
384 	return 0;
385 }
386 
drm_fb_helper_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)387 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
388 					    struct fb_info *info)
389 {
390 	return 0;
391 }
392 
drm_fb_helper_set_par(struct fb_info * info)393 static inline int drm_fb_helper_set_par(struct fb_info *info)
394 {
395 	return 0;
396 }
397 
drm_fb_helper_check_var(struct fb_var_screeninfo * var,struct fb_info * info)398 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
399 					  struct fb_info *info)
400 {
401 	return 0;
402 }
403 
404 static inline int
drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper * fb_helper)405 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
406 {
407 	return 0;
408 }
409 
410 static inline struct fb_info *
drm_fb_helper_alloc_fbi(struct drm_fb_helper * fb_helper)411 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
412 {
413 	return NULL;
414 }
415 
drm_fb_helper_unregister_fbi(struct drm_fb_helper * fb_helper)416 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
417 {
418 }
419 
drm_fb_helper_fill_var(struct fb_info * info,struct drm_fb_helper * fb_helper,uint32_t fb_width,uint32_t fb_height)420 static inline void drm_fb_helper_fill_var(struct fb_info *info,
421 					  struct drm_fb_helper *fb_helper,
422 					  uint32_t fb_width, uint32_t fb_height)
423 {
424 }
425 
drm_fb_helper_fill_fix(struct fb_info * info,uint32_t pitch,uint32_t depth)426 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
427 					  uint32_t depth)
428 {
429 }
430 
drm_fb_helper_setcmap(struct fb_cmap * cmap,struct fb_info * info)431 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
432 					struct fb_info *info)
433 {
434 	return 0;
435 }
436 
drm_fb_helper_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)437 static inline int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
438 				      unsigned long arg)
439 {
440 	return 0;
441 }
442 
drm_fb_helper_unlink_fbi(struct drm_fb_helper * fb_helper)443 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
444 {
445 }
446 
drm_fb_helper_deferred_io(struct fb_info * info,struct list_head * pagelist)447 static inline void drm_fb_helper_deferred_io(struct fb_info *info,
448 					     struct list_head *pagelist)
449 {
450 }
451 
drm_fb_helper_defio_init(struct drm_fb_helper * fb_helper)452 static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
453 {
454 	return -ENODEV;
455 }
456 
drm_fb_helper_sys_read(struct fb_info * info,char __user * buf,size_t count,loff_t * ppos)457 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
458 					     char __user *buf, size_t count,
459 					     loff_t *ppos)
460 {
461 	return -ENODEV;
462 }
463 
drm_fb_helper_sys_write(struct fb_info * info,const char __user * buf,size_t count,loff_t * ppos)464 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
465 					      const char __user *buf,
466 					      size_t count, loff_t *ppos)
467 {
468 	return -ENODEV;
469 }
470 
drm_fb_helper_sys_fillrect(struct fb_info * info,const struct fb_fillrect * rect)471 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
472 					      const struct fb_fillrect *rect)
473 {
474 }
475 
drm_fb_helper_sys_copyarea(struct fb_info * info,const struct fb_copyarea * area)476 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
477 					      const struct fb_copyarea *area)
478 {
479 }
480 
drm_fb_helper_sys_imageblit(struct fb_info * info,const struct fb_image * image)481 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
482 					       const struct fb_image *image)
483 {
484 }
485 
drm_fb_helper_cfb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)486 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
487 					      const struct fb_fillrect *rect)
488 {
489 }
490 
drm_fb_helper_cfb_copyarea(struct fb_info * info,const struct fb_copyarea * area)491 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
492 					      const struct fb_copyarea *area)
493 {
494 }
495 
drm_fb_helper_cfb_imageblit(struct fb_info * info,const struct fb_image * image)496 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
497 					       const struct fb_image *image)
498 {
499 }
500 
drm_fb_helper_set_suspend(struct drm_fb_helper * fb_helper,bool suspend)501 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
502 					     bool suspend)
503 {
504 }
505 
506 static inline void
drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper * fb_helper,bool suspend)507 drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend)
508 {
509 }
510 
drm_fb_helper_hotplug_event(struct drm_fb_helper * fb_helper)511 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
512 {
513 	return 0;
514 }
515 
drm_fb_helper_initial_config(struct drm_fb_helper * fb_helper,int bpp_sel)516 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
517 					       int bpp_sel)
518 {
519 	return 0;
520 }
521 
522 static inline int
drm_fb_helper_single_add_all_connectors(struct drm_fb_helper * fb_helper)523 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
524 {
525 	return 0;
526 }
527 
drm_fb_helper_debug_enter(struct fb_info * info)528 static inline int drm_fb_helper_debug_enter(struct fb_info *info)
529 {
530 	return 0;
531 }
532 
drm_fb_helper_debug_leave(struct fb_info * info)533 static inline int drm_fb_helper_debug_leave(struct fb_info *info)
534 {
535 	return 0;
536 }
537 
538 static inline struct drm_display_mode *
drm_has_preferred_mode(struct drm_fb_helper_connector * fb_connector,int width,int height)539 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
540 		       int width, int height)
541 {
542 	return NULL;
543 }
544 
545 static inline struct drm_display_mode *
drm_pick_cmdline_mode(struct drm_fb_helper_connector * fb_helper_conn,int width,int height)546 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
547 		      int width, int height)
548 {
549 	return NULL;
550 }
551 
552 static inline int
drm_fb_helper_add_one_connector(struct drm_fb_helper * fb_helper,struct drm_connector * connector)553 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
554 				struct drm_connector *connector)
555 {
556 	return 0;
557 }
558 
559 static inline int
drm_fb_helper_remove_one_connector(struct drm_fb_helper * fb_helper,struct drm_connector * connector)560 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
561 				   struct drm_connector *connector)
562 {
563 	return 0;
564 }
565 
566 static inline int
drm_fb_helper_fbdev_setup(struct drm_device * dev,struct drm_fb_helper * fb_helper,const struct drm_fb_helper_funcs * funcs,unsigned int preferred_bpp,unsigned int max_conn_count)567 drm_fb_helper_fbdev_setup(struct drm_device *dev,
568 			  struct drm_fb_helper *fb_helper,
569 			  const struct drm_fb_helper_funcs *funcs,
570 			  unsigned int preferred_bpp,
571 			  unsigned int max_conn_count)
572 {
573 	/* So drivers can use it to free the struct */
574 	dev->fb_helper = fb_helper;
575 
576 	return 0;
577 }
578 
drm_fb_helper_fbdev_teardown(struct drm_device * dev)579 static inline void drm_fb_helper_fbdev_teardown(struct drm_device *dev)
580 {
581 	dev->fb_helper = NULL;
582 }
583 
drm_fb_helper_lastclose(struct drm_device * dev)584 static inline void drm_fb_helper_lastclose(struct drm_device *dev)
585 {
586 }
587 
drm_fb_helper_output_poll_changed(struct drm_device * dev)588 static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev)
589 {
590 }
591 
592 static inline int
drm_fb_helper_generic_probe(struct drm_fb_helper * fb_helper,struct drm_fb_helper_surface_size * sizes)593 drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
594 			    struct drm_fb_helper_surface_size *sizes)
595 {
596 	return 0;
597 }
598 
599 static inline int
drm_fbdev_generic_setup(struct drm_device * dev,unsigned int preferred_bpp)600 drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
601 {
602 	return 0;
603 }
604 
605 #endif
606 
607 static inline int
drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct * a,const char * name,bool primary)608 drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
609 					      const char *name, bool primary)
610 {
611 #if IS_REACHABLE(CONFIG_FB)
612 	return remove_conflicting_framebuffers(a, name, primary);
613 #else
614 	return 0;
615 #endif
616 }
617 
618 #endif
619